CN1941869A - Display image correcting device, image display device, and display image correcting method - Google Patents

Abstract

Disclosed herein is a display image correcting device including, retaining means configured to retain reference correction amount data for correcting nonuniformity as a predetermined factor of an image displayed on a basis of a video signal, the reference correction amount data representing an amount of correction at a predetermined horizontal and vertical position of the image, the amount of correction being obtained in correspondence with a video signal level as a reference, and correcting means configured to perform correction processing on the video signal in correspondence with a horizontal direction and a vertical direction of the image, and a brightness direction, and performing the correction processing on a basis of three-dimensional correction amount data obtained by making two-dimensional correction amount data corresponding to a horizontal and vertical position, the two-dimensional correction amount data being obtained on a basis of the reference correction amount data, linearly proportional or nonlinearly proportional to level of the video signal to be corrected.

Description

Display image correcting device, image display and display image correcting method

The cross reference of related application

The present invention includes and 2005-283985 Japanese patent application of submitting to Japan Patent office on September 29th, 2005 and the relevant theme of submitting to Japan Patent office on July 19th, 2006 of 2006-196669 Japanese patent application, its full content is hereby expressly incorporated by reference.

Technical field

The present invention relates to a kind of display image correcting device and method, be used for vision signal is carried out treatment for correcting, to proofread and correct the predetermined degradation factor of display image.The invention still further relates to a kind of structure of this display image correcting device or image display of its method used.

Background technology

Concerning such as based on the image display of vision signal display image, the phenomenon that may be called as irregularity in brightness, in this phenomenon, because possibility recurring structure problem or the instability of making cause the uniformity of Luminance Distribution in the viewing area of image on screen to be destroyed.This irregularity in brightness is a factor that reduces picture quality, need be removed or suppress, and especially under the situation that coloured image shows, this is because also can cause the colourity inhomogeneities.Therefore, for example, disclose as shown in 2001-231053 number (hereinafter being called patent documentation 1), proposed a kind of structure that is used for correcting luminance nonuniformity as Japan Patent.

Summary of the invention

The present invention has proposed a kind of structure that is used to proofread and correct the irregularity in brightness of display image equally, and can proofread and correct than more effectively carrying out irregularity in brightness in the past.

Therefore, in view of the above problems, according to the following formation of the display image correcting device of the embodiment of the invention.

This display image correcting device comprises: save set, be used to preserve and be used to proofread and correct the N Reference Alignment amount data of conduct based on the inhomogeneities of the predetermined factors of the image of vision signal demonstration, these N Reference Alignment amount data are illustrated in the predeterminated level of image and the correcting value on the upright position, and this correcting value obtains according to the video level as benchmark; And means for correcting, be used for vision signal being carried out treatment for correcting corresponding to the horizontal direction of image and vertical direction and luminance directions, and based on carrying out treatment for correcting by making corresponding to the linear ratio of level of the 2DC amount data of horizontal and vertical position and vision signal to be corrected or the three-dimensional correcting value data that the non-linear ratio obtains, 2DC amount data are based on that N Reference Alignment amount data obtain.

In addition, the following formation of image display.

Image display according to the embodiment of the invention comprises: the display image correcting device unit; And the display device unit, be used for the vision signal display image of proofreading and correct based on through the display image correcting device unit.

The display image correcting device unit comprises: save set, be used to preserve and be used to proofread and correct the N Reference Alignment amount data of conduct based on the inhomogeneities of the predetermined factors of the image of vision signal demonstration, these N Reference Alignment amount data are illustrated in the predeterminated level of image and the correcting value on the upright position, and this correcting value obtains according to the video level as benchmark; And means for correcting, be used for vision signal being carried out treatment for correcting corresponding to the horizontal direction of image and vertical direction and luminance directions, and based on carrying out treatment for correcting by making corresponding to the linear ratio of level of the 2DC amount data of horizontal and vertical position and vision signal to be corrected or the three-dimensional correcting value data that the non-linear ratio obtains, 2DC amount data are based on that N Reference Alignment amount data obtain.

In each above-mentioned structure, for example, be presented at the two-dimentional irregularity in brightness of the image in the display screen portion when (this inhomogeneities is called as irregularity in brightness) in correction, at first preserve N Reference Alignment amount data as the data of predeterminated level that is illustrated in image and the correcting value on the upright position, wherein, this correcting value obtains according to the video level (brightness) as benchmark.Then, at timing, obtain 2DC amount based on N Reference Alignment amount data, and vision signal is carried out treatment for correcting based on the three-dimensional correcting value of the proportional acquisition of brightness by making 2DC amount and vision signal to be corrected corresponding to horizontal and vertical position.

Carrying out being configured in of this correction only provides corresponding to as the N Reference Alignment amount data of the video level of predetermined benchmark the time, can make treatment for correcting go for the brightness of vision signal.In other words, this means when can be suitably during correcting luminance nonuniformity, not need the correction data of preparing quantitatively to equate corresponding to luminance directions with traditional data corresponding to the mode of the brightness of vision signal.

So the present invention can only prepare, stores and preserve the correcting value data corresponding to the reference video level (N Reference Alignment amount data) that are used for the irregularity in brightness correction.Therefore, be used for actual storage and preserve the required memory capacity of correcting value data with a plurality of data being provided or comparing, can reducing corresponding to the situation of specific or more requisite number destination datas of lightness (for example brightness) direction.So, can reduce the required memory span of actual storage correction number data, thereby reduce cost effectively.In addition, for example when regulating the correcting value data during manufacture, compare, can only regulate fully less correcting value data bulk corresponding to luminance directions with traditional situation.Therefore, shorten the adjusting time, thereby improved production efficiency.In addition, the raising of production efficiency also makes cost reduce.

Description of drawings

Fig. 1 is the block diagram that illustrates according to the structure example of the television receiver of the embodiment of the invention;

Fig. 2 illustrates aid illustration according to the notion of the N Reference Alignment scale of present embodiment and based on the schematic diagram of benchmark 2DC amount data generation corresponding to the notion of the 2DC amount data of pixel;

Fig. 3 be illustrate back light unit luminosity inhomogeneities and proofread and correct through the irregularity in brightness that observes after the liquid crystal panel transmission between the schematic diagram of relation;

Fig. 4 illustrates the diagrammatic sketch of notion that aid illustration is used for the formation of the N Reference Alignment amount data that irregularity in brightness proofreaies and correct;

Fig. 5 is the schematic diagram that the notion that interpolation that aid illustration utilizes the N Reference Alignment data to obtain the correcting value data handles is shown;

Fig. 6 A and 6B illustrate by the block diagram of structure example that 2DC amount data obtain the correcting circuit unit of three-dimensional correcting value is set with linear scale;

Fig. 7 A and 7B illustrate by the block diagram of structure example that 2DC amount data obtain the correcting circuit unit of three-dimensional correcting value is set with the non-linear ratio;

Fig. 8 illustrates the block diagram that is used to handle the basic structure that irregularity in brightness that coloured image shows proofreaies and correct;

Fig. 9 is the block diagram that the basic structure of proofreading and correct based on the irregularity in brightness of handling the coloured image demonstration corresponding to the N Reference Alignment scale of two kinds of vision signals is shown;

Figure 10 illustrates to be used for generating block diagram corresponding to the structure of the 2DC amount data of each pixel by the N Reference Alignment amount data of N Reference Alignment scale;

Figure 11 A and 11B illustrate the block diagram that reduces the suitable arrangement examples of system signal processing unit according to the irregularity in brightness correcting unit of present embodiment and space enhanced system signal processing unit or irregularity in brightness correcting unit and space; And

Figure 12 is the schematic diagram that the structure example of adjusting mould (jig, the smelting tool) system that is used for the irregularity in brightness correction is shown.

Embodiment

Fig. 1 shows the structure of application according to the television receiver of the display image correcting device of the embodiment of the invention and image display.

To be input to tuner 11 by the broadcasting wave that the antenna in the television receiver shown in Fig. 11 10 receives.The electric wave that 11 pairs of tuners are input to reception wherein carries out carrier wave demodulation etc.Then, under the control of control unit 19, tuner 11 extracts and obtains the vision signal of specified channel, and this vision signal is outputed to decoder 12.For example, when the vision signal that is input to decoder 12 was encoded (scramble), decoder 12 was carried out demodulation process so that this vision signal is decoded.In the present embodiment, because being used for carrying out vision signal by Digital Signal Processing, handles the video signal processing unit 16 in the subsequent stage, so from decoder 12 output digital video signals.

In this case, video inputs 13 is used to import the vision signal from outputs such as external video devices.The vision signal that is input to the predetermined form of video inputs 13 is input to analog decoder 14.When the vision signal that is input to analog decoder 14 was the analog signal of predetermined form, analog decoder 14 was with the digital video signal of this analog signal conversion for predetermined form.

The terminal T2 of switch 15 will be outputed to from the digital video signal of decoder 12 outputs, the terminal T3 of switch 15 will be outputed to from the digital video signal of analog decoder 14 outputs.Switch 15 is used to select the input video source.Under the control of control unit 19, switch 15 is carried out and is switched, and makes that among terminal T2 and the T3 is connected to terminal T1.When terminal T2 was connected to terminal T1, the digital video signal of exporting from decoder 12 was imported into video signal processing unit 16.That is to say, selected by the broadcast program that receives and channel selection obtains as the input video source.When terminal T3 was connected to terminal T1, the digital video signal of exporting from analog decoder 14 was imported into video signal processing unit 16.That is to say, selected from the vision signal of external device (ED) input as the input video source.

Video signal processing unit 16 is carried out required various signal processing, and this processing comprises that the number of pixels with input digital video signal is converted to the conversion of resolution of number of pixels of display floater of liquid crystal display 18 and picture quality adjusting etc.In addition, 16 pairs of vision signals of video signal processing unit are carried out the irregularity in brightness of treatment for correcting with correcting image.

Will be from the vision signal input display driver 17 of video signal processing unit 16 outputs.Display driver 17 uses incoming video signal to come display driver liquid crystal display 18.Thereby on the display screen of liquid crystal display 18, show image corresponding to vision signal.

Liquid crystal display 18 is the image displaying parts as display unit that formed by liquid crystal.

In addition, Shi Ji television receiver can be regenerated and output sound together with the vision signal of broadcast program that is received or outside input source.Yet, will no longer illustrate or describe the sound reproduction system at this.

Control unit 19 comprises the microcomputer that mutually combines and form by for example CPU (CPU), ROM, RAM etc.Above-mentioned part in the control unit 19 control television receivers 1 etc.

For example, when the vision signal broadcasting that will be in encoding state was input to decoder 12, control unit 19 can be controlled the signal processing that is used for decoding video signal.

High definition) and standard resolution (SD: the signal processing of various systems single-definition) in addition, for example, control unit 19 is carried out control, with the high image quality resolution that incoming video signal is suitable for HDTV (High-Definition Television) etc. (HD:.

In addition, when wanting the display of broadcast source maybe will show input source from video input terminal 13, according to for example operation of aforesaid selection video source, 19 pairs of switches of control unit 15 are carried out switching controls.

In addition, control unit 19 control analog decoders 14, thereby according to carry out suitable digital signal conversion process from the HD/SD system of the signal of video input terminal 13 inputs etc.

In addition, control unit 19 control of video signal processing units 16 are carried out the desired signal that comprises above-mentioned conversion of resolution, picture quality adjusting, irregularity in brightness correction etc. and are handled operation.

Especially, proofread and correct for irregularity in brightness, present embodiment uses the information of the N Reference Alignment scale 19a that preserves in the nonvolatile storage (for example storage area of Rom, EEPROM, flash memories etc.) that is arranged in the control unit 19.As mentioned above, the N Reference Alignment scale is one group of 2DC data, and wherein, the N Reference Alignment in the 2DC data representation screen two-dimensional directional o'clock is corresponding to the value of the correcting value of a Benchmark brightness.

When proofreading and correct the execution signal processing at irregularity in brightness, according to being used for the processing timing that irregularity in brightness is proofreaied and correct in the video signal processing unit 16, the correcting value data of the N Reference Alignment point that control unit 19 will obtain from N Reference Alignment scale 19a are sent to video signal processing unit 16, wherein, these correcting value data are that the three-dimensional correcting value of acquisition is necessary.In addition, as will be described, three-dimensional correcting value data are meant the correcting value data that also have brightness (lightness) correction for direction amount component except that this two dimension of screen level/vertical direction.The structures that will describe by means of the back etc., video signal processing unit 16 uses the correcting value data of N Reference Alignment points to obtain three-dimensional correcting value data, and based on three-dimensional correcting value adjustment of data vision signal, thereby finishes the processing to the irregularity in brightness correction.In addition, to obtain three-dimensional correcting value, send it to the structure that is used for the signal processing system that irregularity in brightness proofreaies and correct in the video signal processing unit 16 then be feasible to the calculation process by CPU in the control unit 19 for example.Yet the processing that obtains three-dimensional correcting value from the 2DC amount is relatively heavy processing, thereby causes necessarily or bigger processing burden for the microcomputer of control unit 19.Therefore, in light of this situation, present embodiment makes video signal processing unit 16 carry out the processing that obtains three-dimensional correcting value.

To describe below according to the irregularity in brightness of present embodiment and proofread and correct.

Usually, irregularity in brightness is meant the inhomogeneities when brightness when two-dimensional directional is observed the image that is presented on the display screen.In order to proofread and correct this irregularity in brightness, establishment has the correction data of the correcting value of regulating according to the brightness irregularities sexual state in the real image.With the storage of this correction data be kept in the device such as display unit etc.Then, call storage and be kept at wherein correction data such as the device of display unit, and correcting video signal.As a result, thereby the intensity level of having regulated vision signal is eliminated irregularity in brightness, and proofreaies and correct the irregularity in brightness of display image effectively.

Below the correction data that is used for correcting luminance nonuniformity will be described briefly.

Irregularity in brightness is the inhomogeneities that is presented at the brightness in the two-dimensional space of horizontal/of the image on the display screen.Therefore, need the correction data of expression corresponding to the correcting value of this two-dimensional space.With reference to Fig. 2 such 2DC data are described below.

As shown in Figure 2, in the process that obtains the 2DC data, divide the line that is provided with according to intended pixel digit (N and M) by directions X (horizontal direction) and Y direction (vertical direction), divide two-dimensional space as a display screen (image) along image.Then, as shown in Figure 2,, provide coordinate 0 on the directions X, and provide coordinate 0 on the Y direction to q to p in mode corresponding to the level on the display screen (the X)/cut-off rule of vertical (Y) direction and the outline line of screen.For being provided with, each crosspoints of these coordinates is expressed as C (0,0), C (0,1) ... C (p, N Reference Alignment point q).In this case, (p+1) * (q+1) individual N Reference Alignment point is set.Then, for example, below the intensity level of the vision signal of specified conditions, measure the brightness at each the N Reference Alignment point place that is provided with as mentioned above on the display screen, and the correcting value of each N Reference Alignment point is set according to measurement result.The 2DC quantity set that is provided with forms the 2DC data corresponding to an intensity level like this.

Then, using the data that obtain like this to obtain under the 2DC data conditions, to forming the pixel cell correcting luminance nonuniformity as check point of display image as shown in Figure 2.

Therefore, cut apart and be provided with by on the horizontal direction of the display screen shown in Fig. 2 and vertical direction, being connected the square area of space (internal reference check point zone) of four N Reference Alignment points formation adjacent one another are.Based on formed (fact in the individual internal reference check point of p * q) zone, with internal reference check point region representation be in this case [1,1], [1,2] ... [p, q].

For example, the pixel dxy as check point that presents in the internal reference check point zone [5,3] among use Fig. 2 comes correcting luminance nonuniformity.Therefore, for example, at first determine to arrive the distance of pixel dxy from N Reference Alignment point C (4,2), C (5,2), C (4,3) and the C (5,3) that forms internal reference check point zone [5,3].Then, according to the distance of determining,, and carry out scheduled operation, thereby obtain the correcting value of pixel dxy position for each correcting value among N Reference Alignment point C (4,2), C (5,2), C (4,3) and the C (5,3) assigns weight (weight).That is to say, use each correcting value among N Reference Alignment point C (4,2), C (5,2), C (4,3) and the C (5,3), obtain the correcting value at the check point place of pixel dxy by interpolation.Based on the correcting value of such acquisition, proofreaied and correct intensity level corresponding to the video signal sampling of pixel dxy.Thereby show at pixel dxy place with such brightness, to eliminate irregularity in brightness.

Fig. 3 schematically shows the structure corresponding to the liquid crystal display of the liquid crystal display in the present embodiment 18.As mentioned above, liquid crystal display comprises liquid crystal panel and the back light unit that places the liquid crystal panel back side.To provide the description of use below with reference to the brightness irregularities of the 2DC adjustment of data liquid crystal display of Fig. 2 description.

Back light unit is considered to have the light source corresponding to the flat shape of the shape of liquid crystal panel, and the luminous position of supposing the two dimensional surface light source is P1 and P2.It is luminous to suppose to sentence brightness (luminosity) A at luminous position P1, and it is luminous to sentence brightness (luminosity) A-dA at luminous position P2.That is to say that when with luminous position P1 during as benchmark, there is the luminosity error in luminous position P2, is expressed as quantity-dA.

The luminosity that sends from luminous position P1 and P2 is that the light of A and A-dA passes the LCD panel, to be sighted brightness y (observation brightness).Based on the transmissivity and the driving voltage x that is used to drive liquid crystal panel of liquid crystal panel, by the equation 1 expression observation brightness y of following use exponent gamma.

[equation 1]

y＝x ^γ

Based on equation 1, be the luminous position P1 of A and the observation brightness y1 that on liquid crystal panel, observes corresponding to luminosity by 2 expressions of following equation.

[equation 2]

y1＝Ax ^γ

Since at another luminous position P2 with luminosity A-dA emission light, so with respect to the luminosity A of luminous position P1, luminous position P2 has luminosity error-dA.Luminosity between luminous position P1 and the P2 is poor-and dA shows as poor between the observation brightness, that is, and the irregularity in brightness that causes by the photoconduction that passes liquid crystal panel.Therefore, when the observation brightness of proofreading and correct,, apply the voltage of representing by x+dx by adding to driving voltage x that correcting value dx obtains so that it equals corresponding to the observation brightness of luminous position P1 constantly corresponding to luminous position P2.The observation brightness y2 corresponding to luminous position P2 that obtains by such correction is represented by following equation 3.

[equation 3]

y2＝(A-dA)(x+dx) ^γ

In this case, irregularity in brightness is proofreaied and correct to mean observation brightness y1 and y2 is equal to each other.Based on this, draw following equation 4 from above-mentioned equation 2 and 3.

[equation 4]

Ax ^γ＝(A-dA)(x+dx) ^γ

When finding the solution dx, obtain following equation 5 by above-mentioned equation 4.

[equation 5]

$\mathrm{dx}=((1/\left((1-\mathrm{dA}/A{)}^{\frac{1}{\mathrm{\γ}}}\right))-1)x$

In addition, making dx (max) is corresponding to the correcting value of the driving voltage of luminous position P2, wherein, when driving voltage x=1 is set, obtains this correcting value, by the above-mentioned equation 5 of following equation 6 expressions.

[equation 6]

$\mathrm{dx}\left(\max \right)=(1/\left((1-\mathrm{dA}/A{)}^{\frac{1}{\mathrm{\γ}}}\right))-1$

According to the relation between above-mentioned equation 6 and the equation 5, by the correcting value dx of following equation 7 expression driving voltages.

[equation 7]

dx＝dx(max)×x

Equation 7 expression correcting value dx and driving voltage x are proportional.

As mentioned above, in theory, the correcting value dx of each brightness is proportional with driving voltage x.Yet, be known that in fact, when carrying out timing, can not obtain the result inevitably based on equation 7.

A reason is when to vision signal combine digital signal processing, has the restriction of resolution.

In addition, in order to describe, the correction between above-mentioned observation brightness y1 and the y2 only relates to brightness with being easily understood, so a kind of variable corresponding to observation brightness y is only arranged.Yet the real image that shows is a coloured image usually.Because the inhomogeneities of coloured image brightness can cause the colourity inhomogeneities, so in irregularity in brightness is proofreaied and correct, also consider the colourity nonuniformity correction.At the colourity nonuniformity correction, need to proofread and correct brightness (lightness) corresponding to each of the multiple signal component that is used for the coloured image demonstration.Therefore, a plurality of variablees are provided corresponding to multiple signal component.For example, when based on the time corresponding to three kinds of signal display images of three primary colors R, G and B, the common mode of thinking is thought, should proofread and correct the brightness or the intensity (lightness) of each color among R, G and the B, and accordingly, need three kinds of variablees to proofread and correct each level in R, G and the B vision signal.

In addition, according to theory, be difficult to only represent the transmissivity of actual liquid crystal panel by equation with exponent gamma.

Because above-mentioned multiple situation, proofread and correct for the irregularity in brightness of reality, provide with reference to the described a plurality of 2DC data sets of Fig. 2 with corresponding to each brightness.Fig. 4 schematically shows such correction data structure.

As shown in Figure 4, for correction data, three dimensions is set in the horizontal direction (directions X) of screen, the vertical direction (Y direction) and brightness (lightness) direction (Z direction) of screen.Can be with the 2DC data set shown in Fig. 2 as list structure corresponding to the N Reference Alignment amount of the horizontal/of screen, and in this figure, be called " N Reference Alignment scale ".In this case, show the example of first to the 3rd N Reference Alignment scale that is provided with corresponding to three different brightness.

When treatment for correcting, based on intensity level (corresponding to the level of driving voltage) on brightness (lightness) direction and the location of pixels on the two-dimensional directional, use the suitable correcting value information and executing interpolation operation in first to the 3rd N Reference Alignment scale, thereby determine correcting value, then vision signal is carried out treatment for correcting.

In addition, for the interpolation processing method, there are the interpolation of the linearity execution of representing by the solid line among Fig. 5 and the interpolation of carrying out based on curve by the higher order functionality that passes through to be scheduled to that the dotted line among Fig. 5 is represented.

Television receiver 1 according to present embodiment has above with reference to the described liquid crystal display 18 as display part of Fig. 1.That is to say, according to the television receiver 1 use liquid crystal display of present embodiment.

As everyone knows, liquid crystal display comprises by liquid crystal layer and being used to and drives liquid crystal panel (display floater) that the drive circuit system of the liquid crystal of liquid crystal layer forms, is used as the back light unit to the light source of the rear side irradiates light of liquid crystal panel.

The back light unit that uses in according to the liquid crystal display 18 of present embodiment has on the rear side that is arranged in liquid crystal panel to shine three primary colors R (redness), G (green) and B (blueness) LED (light-emitting diode) of white light to the rear side of liquid crystal panel.Though cold-cathode tube has been widely used as backlightly so far, allows LED is dropped under the background of actual use backlight in the raising of the luminous efficiency of LED, can be with LED as backlight.Compare with cold-cathode tube, the advantage of LED is, because for example LED does not use mercury can have temperature characterisitic and response characteristic preferably preferably with low voltage drive, LED as material, LED, so LED is suitable for environment.

Yet, when with present embodiment in the same with LED when the back light unit, following has become significantly about irregularity in brightness and irregularity in brightness calibration problem.

When forming back light unit, the LED of requirement is arranged in two-dimensionally the rear side of liquid crystal panel with preset pattern with LED.Then, utilize the rear side of the two-dimentional irradiates light area illumination liquid crystal panel that obtains by these LED collection.

Yet, owing to each LED can be regarded as a point-source of light, so said structure obtains two-dimentional irradiates light zone by the point-source of light collection.Therefore, the arrangement pitch of the state of irregularity in brightness corresponding to LED takes place.For example, this means and cold-cathode tube is compared as situation backlight, the degree of irregularity in brightness is very little.

When back light unit is formed by cold-cathode tube, for example arrange the cold-cathode tube of requirement in the vertical direction of screen, make that the longitudinal direction of cold-cathode tube is consistent with the horizontal direction of screen, thereby form back light unit.Alternatively, utilize the light of reflection such as speculum, with the back side of irradiating liquid crystal panel equably along a cold-cathode tube of the horizontal direction of screen and a direction in the vertical direction.Utilize preceding structure, for example, irregularity in brightness mainly occurs between the cold-cathode tube of arrangement adjacent one another are.Utilize the structure of back, irregularity in brightness changes according to the distance of distance cold-cathode tube.

Therefore, be appreciated that in using each backing structure of cold-cathode tube that cold-cathode tube all be to have the shape of longitudinal direction and be linear light sorurce, so the degree of irregularity in brightness is big during than use LED.

To provide the description of the irregularity in brightness correction that makes the reduction of irregularity in brightness degree of adopting above-mentioned realizations such as LED-backlit unit below.For example, with using cold-cathode tube to compare, need increase the check point (N Reference Alignment scale) of each the 2DC data set shown in Fig. 2 according to the irregularity in brightness degree as situation backlight.This means, increase the size of the correcting value data that form the N Reference Alignment scale.Especially, number of pixels and size according to liquid crystal panel, by dividing the number that entire image obtains internal reference check point zone (Fig. 2) with vertical direction in the horizontal direction, be approximately 30 * 16 or 60 * 33 according to the number in the required internal reference check point zone of irregularity in brightness degree.In conventional method, provide a plurality of such N Reference Alignment scale collection corresponding to brightness (lightness) direction, thereby increase the size that is used for the uneven data of correcting luminance significantly.

When the size of data that is used for the irregularity in brightness correction increases, for example, need increase be used to store and preserve the memory capacity of this memory of data, thereby cause corresponding cost to increase.In addition, because the correcting value data increase, regulate the correcting value data so during manufacturing waits, need to spend more time, thereby cause the reduction of production efficiency.

When LED is become hour as backlight and irregularity in brightness degree, it is obvious and very important that the problems referred to above become.

Therefore, as will be described, present embodiment has adopted following irregularity in brightness correcting structure, and it can provide the calibration result that is similar to traditional calibration result at least in the size that reduces required correction data.

For this reason, present embodiment only has one as shown in Figure 2 corresponding to the 2DC data set of certain luminance.In other words, present embodiment does not have a plurality of N Reference Alignment scale collection corresponding to brightness (lightness) direction.In addition, for example the same with the N Reference Alignment numerical table 19a shown in Fig. 1, the datum quantity checking list that will have such structure is kept in the predetermined storage unit that is arranged in the control unit 19.

Yet, as mentioned above, in fact be difficult to realize the appropriate brightness nonuniformity correction based on the correcting value data that only comprise a N Reference Alignment scale collection.Present embodiment addresses this problem by using the structure shown in Fig. 6 A and 6B or Fig. 7 A and the 7B.

Fig. 6 A and 6B show the structure example of the correcting circuit unit 21 that the irregularity in brightness of the television receiver 1 that is used for present embodiment proofreaies and correct.In the structure of Fig. 1, correcting circuit unit 21 is arranged on the predetermined signal processing stage of video signal processing unit 16.In fact, correcting circuit unit 21 has the structure corresponding to Digital Signal Processing, and handles the vision signal that needs to proofread and correct with the form of digital signal and import.

To provide description below as the N Reference Alignment amount data of the N Reference Alignment amount data of the correcting value with addition or subtraction form of the N Reference Alignment amount data that form 2DC data (N Reference Alignment scale 19a) and coefficient form, wherein, in addition or subtraction form, by addition or subtraction correcting video signal, in the coefficient form, by the multiplication correcting video signal of gain coefficient.

Fig. 6 A shows the structure example corresponding to the correcting circuit unit 21 of the correcting value of addition form.Correcting circuit unit 21 comprises: be used for input signal (data) phase adduction with the adder 31 of its output be used for input signal multiplied each other and with the multiplier 32 of its output.

Vision signal to be corrected separately inputs to adder 31 and multiplier 32.Multiplier 32 multiplies each other vision signal to be corrected and correcting value data.Multiplier 32 outputs to adder 31 with multiplied result.According to location of pixels corresponding to vision signal to be corrected, use the N Reference Alignment amount data that form the N Reference Alignment scale, obtain to be input to the correcting value data of multiplier 32 by interpolation.Therefore, correcting value has the component that only is used for corresponding to the two-dimensional directional of certain luminance, and does not have the component corresponding to three-dimensional (brightness (lightness) direction).Such correcting value is called " 2DC amount ".

Adder 31 is exported addition with the computing of vision signal to be corrected and multiplier 32, and the result of addition is exported.The output of adder 31 is the vision signals after the treatment for correcting.

In said structure, multiplier 32 multiplies each other vision signal and 2DC amount data.Therefore, the level (brightness or lightness) that has obtained according to vision signal will be by the correcting value that directly is added to original video signal or deducts from original video signal.That is to say, by obtaining multiplier 32 output calibration amounts in the Calais mutually with input multiplier 32 2DC amount before corresponding to the correcting value component of video luminance signal to be corrected.That is to say, from the correcting value of multiplier 32 outputs are three-dimensional correcting value data, wherein, these data have the horizontal direction (directions X) with reference to the described screen of Fig. 4, the vertical direction (Y direction) of screen and the correcting value component of brightness (lightness) direction (Z direction).Afterwards, adder 31 is with three-dimensional correcting value and original video signal addition, thus the vision signal that acquisition is proofreaied and correct.

Fig. 6 B illustrates the structure example corresponding to the correcting circuit unit 21 of the 2DC amount of coefficient form.

Correcting circuit unit 21 multiplies each other by the 2DC amount data of multiplier 33 with vision signal to be corrected and coefficient form, thereby the vision signal after the acquisition treatment for correcting is as the output of multiplier 33.

The 2DC amount data instance of supposing addition in the correcting circuit unit 21 shown in Fig. 6 A or subtraction form is as 10 bits, and the value that then can suppose correcting value is in 0 to 1023 scope.In addition, for example negative correcting quantity can be expressed as complement code.In concrete example, suppose that the value of the 2DC amount data representation of 10 bits is+102, the recruitment of the value of this means is roughly 10% of the full scale of video level (full scale).On the other hand, in the structure of Fig. 6 B, when 2DC amount data are got 1.1 times value of expression, can obtain the identical correction result of situation of 2DC amount data representation+102 of 10 bits in the structure with Fig. 6 A.

So, can obtain identical correction result by the structure of Fig. 6 A and Fig. 6 B.In fact, can use in the structure of Fig. 6 A and Fig. 6 B any.Yet, because the structure of Fig. 6 B only needs a multiplier to satisfy the demand, and the structure of Fig. 6 A needs an adder and a multiplier just can satisfy the demand, so from reducing the angle of circuit size and saving cost etc., the structure of Fig. 6 B is more favourable.

The structure of the correcting circuit unit 21 shown in Fig. 6 A obtains three-dimensional correction data by 2DC amount and vision signal to be corrected are multiplied each other in multiplier 32.By making 2DC amount and the linear ratio of video level (brightness) to be corrected obtain three-dimensional correction data.On the other hand, the correcting circuit unit 21 of Fig. 6 B directly multiplies each other vision signal to be corrected 2DC amount data with the gain form.As mentioned above, the correcting circuit unit 21 of Fig. 6 B provides the similar result of result with the circuit unit of Fig. 6 A.Therefore we can say that the correcting circuit unit 21 of Fig. 6 B also obtains three-dimensional correcting value by the linear ratio of level (brightness) that makes 2DC amount and vision signal to be corrected, and comes correcting video signal based on three bit correction amount data.

Yet, understandable as description by earlier in respect of figures 3, owing to comprise for example multiple factor of the transmissivity problem of liquid crystal panel, the brightness y that observes on display screen tends to have nonlinear characteristic with respect to the level (brightness or lightness) of original video signal.Therefore, preferably, in obtaining the process of three-dimensional correcting value, because can expect better to proofread and correct the result, so correcting circuit unit 21 makes the 2DC amount become the non-linear ratio with the level of vision signal to be corrected.

Fig. 7 A and 7B show the structure example of carrying out the correcting circuit unit 21 that irregularity in brightness proofreaies and correct based on three-dimensional correcting value, wherein, become the non-linear ratio to obtain three-dimensional correcting value by making the 2DC amount with the level of vision signal to be corrected.

Fig. 7 A shows the structure under the 2DC amount situation of addition or subtraction form.Structure shown in Fig. 7 A is to form by add nonlinear circuit 35 in the structure shown in Fig. 6 A.Nonlinear circuit 35 is set to provide the vision signal that will proofread and correct at the input phase of multiplier 32.

Nonlinear circuit 35 has for example hardware of ROM etc.Nonlinear circuit 35 keeps and the relevant non-linear response characteristic of video level (brightness).Nonlinear circuit 35 provides the level of incoming video signal according to the nonlinear characteristic that keeps, and then vision signal is outputed to multiplier 32.Therefore, has value as the three-dimensional correcting value data of the output of multiplier 32 by making the 2DC amount become the non-linear ratio to obtain with brightness.

Fig. 7 B shows the structure under the situation of 2DC amount of coefficient form.

By in the structure shown in Fig. 6 B, adding the correcting circuit unit 21 shown in nonlinear circuit 36 and the multiplier 34 formation Fig. 7 B.Nonlinear circuit 36 in this case keeps the nonlinear characteristic according to the 2DC amount setting of coefficient form.Based on nonlinear characteristic, the level of the vision signal that nonlinear circuit 36 conversion are to be corrected is exported the result then.Then, nonlinear circuit 36 outputs to multiplier 34 with the result.

Multiplier 34 multiplies each other the output of nonlinear circuit 36 and the 2DC amount data of coefficient form.Thereby, make 2DC amount data have nonlinear characteristic according to the level of vision signal to be corrected.Then, multiplier 33 will have the 2DC amount data of nonlinear characteristic and vision signal to be corrected multiplies each other.

So the appropriate brightness nonuniformity correction is all carried out based on the nonlinear characteristic of the brightness y that for example measures in each the correcting circuit unit in the correcting circuit unit 21 of Fig. 7 A and 7B.

In fact, can adopt any one structure in the correcting circuit unit 21 shown in Fig. 7 A and Fig. 7 B.Yet, to compare with adder, multiplier has bigger circuit size usually and needs higher cost.Therefore, consider circuit size and cost, compare that the circuit with a multiplier and an adder of Fig. 7 A is more favourable as computing unit with the circuit of Fig. 7 B with two multipliers.

Actual TV receiver 1 color display according to present embodiment.

Under present case, the known conventional system that is used for the display color television image is to use the system corresponding to the signal (three primary signals) of three primary colors [R (redness), G (green) and B (blueness)].Alternatively, using signal [Y, Cr and Cb] or [Y, Pr and Pb] is known as the system of the combination of luminance signal and color difference signal.Therefore,, no matter use which system, all can use three kinds of vision signals of one in [R, G and B], [Y, Cr and Cb] and [Y, Pr and Pb] group for color display.

For example, when according to the television receiver 1 of present embodiment during, its structure has been shown among Fig. 8 has been arranged on the basic structure that irregularity in brightness is proofreaied and correct that is used in the television receiver 1 by the above-mentioned system color display that is used for that coloured image shows.

Fig. 8 illustrates as the irregularity in brightness correcting unit 20 that is used for the circuit part of correcting luminance nonuniformity.Irregularity in brightness correcting unit 20 has corresponding to three correcting circuit unit 21A, 21B of R, B and G vision signal and 21C.These correcting circuit unit 21A, 21B and 21C have the structure of a shown correcting circuit unit 21 among Fig. 6 A and 6B and Fig. 7 A and the 7B.

In structure shown in Figure 8, for example, will import corresponding correcting circuit unit 21A, 21B and 21C corresponding to R, B and the G vision signal of [R, G and B] system.In addition, will corresponding to the 2DC amount data that are used for correcting luminance nonuniformity of color R, B and G import corresponding correcting circuit unit 21A, 21B and, 21C.That is to say, show for coloured image, setting has corresponding to correcting circuit unit 21A, the 21B of R, B and G vision signal and the correction signal treatment system of 21C respectively, and preserves according to three the 2DC amount data (three N Reference Alignment scales) as shown in Figure 2 that are used for the treatment for correcting system creation of R, G and B vision signal.

Equally, be different from use under the situation of system such as [Y, Cr and Cb] system, [Y, Pr and Pb] system etc. of [R, G and B] system as color image display system, irregularity in brightness correcting unit 20 comprises having corresponding to correcting circuit unit 21A, the 21B of each vision signal and the treatment for correcting system of 21C, and prepares and preserve the 2DC amount data that are used for correcting luminance nonuniformity according to the demonstration component of vision signal.Will be corresponding to 2DC amount data input correcting circuit unit 21A, 21B and the 21C of incoming video signal to be corrected.

In the past,, need a plurality of 2DC amount data (N Reference Alignment scale) that are used for corresponding to brightness (lightness) direction of each signal of three kinds of vision signals in order to ensure the brightness irregularities of correcting colour images.Therefore in the present embodiment, only there are 2DC amount data just enough, do not damage the effect that reduces to be used for the size of data that irregularity in brightness proofreaies and correct corresponding to each signal in three kinds of vision signals.

Yet, each the 2DC amount data (N Reference Alignment scale) that above-mentioned needs are used for various video signal that coloured image shows mean, from absolute viewpoint, be used for size of data increase significantly that irregularity in brightness is proofreaied and correct along with the kind quantity of vision signal.Therefore, further reduce, so need to adopt the structure of coming the irregularity in brightness of correcting colour images with the N Reference Alignment scale of lesser number owing to be used for the size of data of irregularity in brightness correction.

Therefore, in fact the television receiver 1 according to present embodiment has adopted structure shown in Figure 9 as irregularity in brightness correcting unit 20.In addition, in description with reference to figure 9, equally at first will be as an example corresponding to the situation of [R, G and B] system.

Setting has three treatment for correcting systems corresponding to correcting circuit unit 21A, the 21B of R, G and B and 21C as correcting circuit unit 21.Because 2DC amount data will be transfused to correcting circuit unit 21A, 21B and 21C in these treatment for correcting systems, therefore only need two kinds of 2DC data, that is, and the first 2DC amount and the second 2DC amount.

The first 2DC amount data are to be created and to be conditioned color component R is carried out the 2DC amount data that irregularity in brightness is proofreaied and correct.The second 2DC amount data are to be created and to be conditioned color component B is carried out the 2DC amount data that irregularity in brightness is proofreaied and correct.That is to say that present embodiment does not use and is used for the 2DC amount data corresponding to color component G that irregularity in brightness is proofreaied and correct.So, only will and for example be kept in the memory corresponding to two N Reference Alignment scales storage of R and B.The size of data of N Reference Alignment scale has as a whole further reduced and the corresponding amount of clipped corresponding to the N Reference Alignment scale of color component G.

In addition, the first 2DC amount data in this case and the second 2DC amount data can be formed by simply obtained correcting value data, to eliminate the independent measurement luminance difference of R and B.Yet, for example, the first 2DC amount data and the second 2DC amount data can be formed by the correcting value data of determining, improve the result with the best of acquisition irregularity in brightness when mainly R and B being carried out watching when irregularity in brightness is proofreaied and correct as a whole actual displayed image.

Irregularity in brightness correcting unit 20 among Fig. 9 has switch SW 1, SW2 and SW3, is used to switch the path that is used for the first 2DC amount and the second 2DC amount are input to correcting circuit unit 21.Switch SW 1, SW2 and SW3 realize switching by of selectively terminal T1 being connected among terminal T2, terminal T3 and the terminal T4 respectively, and realize switching by the mode of interlocking each other.The terminal T1 of switch SW 1, SW2 and SW3 is connected to the correcting value data input of correcting circuit unit 21A, 21B and 21C respectively.

The terminal T2 of switch SW 1 and terminal T3 are provided for the first 2DC amount data.The terminal T4 ground connection of switch SW 1 (conceptive can being disconnected).

The terminal T2 of switch SW 2 is provided for the second 2DC amount data.The terminal T3 ground connection of switch SW 2.The terminal T4 of switch SW 2 also is provided for the second 2DC amount data.

The terminal T2 ground connection of switch SW 3.The terminal T3 of switch SW 3 is provided for the second 2DC amount data.The terminal T4 of switch SW 3 is provided for the first 2DC amount data.

According to the transition state of switch SW 1, SW2 and SW3, the pattern that is input to the first 2DC amount data of correcting circuit unit 21A, 21B and 21C and the second 2DC amount data is as follows.

First pattern when the terminal T2 of switch SW 1, SW2 and SW3 is connected to terminal T1 is as follows.

Correcting circuit unit 21A (corresponding to R) ← first 2DC amount data (corresponding to R)

Correcting circuit unit 21B (corresponding to B) ← second 2DC amount data (corresponding to B)

Correcting circuit unit 21C (corresponding to G) ← ground connection: do not have the input of correcting value data

Second pattern when the terminal T3 of switch SW 1, SW2 and SW3 is connected to terminal T1 is as follows.

Correcting circuit unit 21A (corresponding to R) ← first 2DC amount data (corresponding to R)

Correcting circuit unit 21B (corresponding to B) ← ground connection: do not have the input of correcting value data

Correcting circuit unit 21C (corresponding to G) ← second 2DC amount data (corresponding to B)

Three-mode when the terminal T4 of switch SW 1, SW2 and SW3 is connected to terminal T1 end is as follows.

Correcting circuit unit 21A (corresponding to R) ← ground connection: do not have the input of correcting value data

Correcting circuit unit 21B (corresponding to B) ← second 2DC amount data (corresponding to B)

Correcting circuit unit 21C (corresponding to G) ← first 2DC amount data (corresponding to R)

So, in irregularity in brightness correcting unit 20 shown in Figure 9, be input to two correcting circuit unit from correcting circuit unit 21A, 21B and 21C, selecting respectively corresponding to first 2DC amount data of R component correction and the second 2DC amount data of proofreading and correct corresponding to the B component.That is to say, all do not carry out irregularity in brightness in R, G, the B color component each to proofread and correct even be not, but only to a part of correcting luminance nonuniformity in these color components, based on from visually having improved this fact of irregularity in brightness under the not in-problem situation, the structure shown in Fig. 9 can be proofreaied and correct and reaches the purpose of proofreading and correct whole screen intensity by the color component R among R, G and the B and B being carried out irregularity in brightness.

In structure shown in Figure 9, based on the first 2DC amount data corresponding to color component R and the second 2DC amount data the fact corresponding to color component B, the path that forms in first pattern is an optimal path, by this path the first 2DC amount data (corresponding to R) are imported correcting circuit unit 21A (corresponding to R), and with the second 2DC amount data (corresponding to B) input correcting circuit unit 21B (corresponding to B).Therefore, the terminal T2 of switch SW 1, SW2 and SW3 can both be connected to terminal T1 usually, to form above-mentioned signal path.

Yet, have some because some factors cause and can not proofread and correct the situation that obtains expected result from the irregularity in brightness that uses above-mentioned signal path.In this case, use to be different from second pattern of first pattern or the path in the three-mode, may obtain better to proofread and correct the result.

In these cases, should carry out the switching of switch SW 1, SW2 and SW3.

For example, when image shows, can be corresponding to the timely diverter switch SW1 of pixel cell, SW2 and SW3.Therefore, when creating the N Reference Alignment scale, carry out and measure, and each pixel or each image-region are partly assessed first pattern that the best result of correction can be provided in the three-mode.Based on this result, create and preserve the information of the corresponding relation between remarked pixel and the pattern.Then, control as showing with reference to this information and executing Switch Control.

As for based on aforementioned first to the relation between input of the 2DC amount data of three-mode and the correcting circuit unit 21, there is the situation (second pattern and three-mode) that is provided for the first 2DC amount data (corresponding to R) or the second 2DC amount data (corresponding to B) corresponding to the correcting circuit unit 21C of color component G.Correcting circuit unit 21A corresponding to color component R only is provided the first 2DC amount data (corresponding to R) or is not provided data, and is not provided the second 2DC amount data (corresponding to B).Similarly, only be provided the second 2DC amount data (corresponding to B) or be not provided data corresponding to the correcting circuit unit 21B of color component B, and be not provided the first 2DC amount data (corresponding to R).

This is because R and B are complementary colours.So, be difficult to by proofread and correct irregularity in brightness corresponding to the correcting value of color component B corresponding to color component R.Similarly, be difficult to by proofread and correct irregularity in brightness corresponding to the correcting value of color component R corresponding to color component B.Therefore, got rid of the pattern that to expect the correction result that draws, switched to carry out and only prepare aforesaid pattern.

When with structure applications shown in Figure 9 in being different from [R, G and R] during [Y, Cr and Cb] system, [Y, Pr and Pb] system etc. of system, can be for example with Cr or the input of Pr signal corresponding to the vision signal input of R, with Cb or the input of Pb signal corresponding to the vision signal input of B and with the vision signal input of Y-signal input corresponding to G.

Figure 10 shows and is used to generate corresponding to first 2DC amount data pixel cell, that will be transfused to correcting circuit unit 21A, 21B and 21C and the block diagram of the second 2DC amount data.

In fact, be written into and be kept among the memory element ROM (or EEPROM, flash memory etc.) as hardware based on the 2DC amount data (that is, the N Reference Alignment scale 41) of structure shown in Figure 2.N Reference Alignment scale 41 in this case has two tables corresponding to the first 2DC amount and the second 2DC amount.That is, N Reference Alignment scale 41 is made up of two tables, and one is the N Reference Alignment scale that is used for corresponding to the irregularity in brightness correction of color component R, and another is the N Reference Alignment scale that is used for corresponding to the irregularity in brightness correction of color component B.

Correcting value counting circuit 42a generates the first 2DC amount data corresponding to pixel cell.Therefore, as described earlier with reference to Figure 2, correcting value counting circuit 42a identification comprises the internal reference check point zone corresponding to the location of pixels of vision signal to be corrected, and obtains to form the N Reference Alignment amount (the first N Reference Alignment amount) in the internal reference check point zone that is identified from the table of the first 2DC amount (corresponding to R) that is used for N Reference Alignment scale 41.Then, handle, generate the first 2DC amount of the vision signal that is used for location of pixels by using the first N Reference Alignment amount to carry out with reference to figure 2 described interpolations.

With the class of operation of correcting value counting circuit 42a seemingly, correcting value counting circuit 42b obtains to form the N Reference Alignment amount (the second N Reference Alignment amount) in the internal reference check point zone that is identified from the table of the second 2DC amount (corresponding to B) that is used for N Reference Alignment scale 41.Then, handle the second 2DC amount of generation by using the second N Reference Alignment amount that is obtained to carry out interpolation.

By switch SW shown in Figure 91, SW2 and SW3, with the first 2DC amount data and second 2DC amount data input correcting circuit unit 21A, 21B and the 21C that generates like this.

Usually adopt the structure that vision signal is comprised the Nonlinear Processing of gamma correction etc. based on the image display of vision signal display image.As everyone knows, for example, gamma correction is used to proofread and correct the light characteristic of the cathode ray tube relevant with the voltage of vision signal transmitting terminal at first.Now, showing the output equipment end,, carrying out the gamma Nonlinear Processing of transmitting terminal or the gamma correction that is used to provide vision signal of display device end with characteristic of not losing nonlinear characteristic for the contrast of improving intermediate luminance etc.These signal processing that is used for enhancing contrast ratio such as gamma correction etc. can be called the processing of the level that is used in two-dimensional space, highlighting such as image.This processing will be known as the processing of space enhanced system.

To provide the description that concerns between the processing that is used for signal processing system that irregularity in brightness proofreaies and correct and above-mentioned space enhanced system according to present embodiment below.

The irregularity in brightness treatment for correcting only is used for changing the gamma correction in the display device zone that irregularity in brightness takes place.Handle the vision signal that produces when input changes from this brightness, so that it was carried out the processing of space enhanced system, irregularity in brightness was proofreaied and correct the brightness change meeting that causes and is changed correcting value in the enhanced system of space in certain direction, thereby produces error.As a result, for example the correction of gamma correction becomes inappropriate, and can reduce image quality on the contrary.

Therefore, when according to being used for signal processing system that irregularity in brightness proofreaies and correct and space enhancing signal treatment system and being bonded to each other of present embodiment, shown in Figure 11 A, irregularity in brightness correcting unit 20 is arranged on the back of the space enhanced system processing unit 51 of the signal processing that is used to carry out the space enhanced system.

So irregularity in brightness is proofreaied and correct the nonlinear properties processing that the brightness that causes changes can not influence space enhanced system processing unit 51, so solved the problem of above-mentioned correcting value error.

In addition, exist vision signal to handle the situation opposite, for example, carry out and in the space of for example image, produce the signal processing that (easing) system is relaxed in the space of relaxing the brightness degree effect with the signal processing of space enhanced system.The signal processing of space mitigation system is used for handling for example shake and error diffusion etc.When vision signal was carried out such processing, for example, the contrast of image space reduced, and surperficial gray scale increases.

Usually, as mentioned above, irregularity in brightness is proofreaied and correct the brightness that only changes in the display device zone that irregularity in brightness takes place.So, when the vision signal with unified picture material that shows is as a whole carried out the irregularity in brightness timing, can produce difference corresponding to the surface image brightness in the zone of the vision signal of proofreading and correct and between corresponding to the surface image brightness in the zone of uncorrected vision signal.This difference can be visually perceived to unnatural.In addition, particularly when reducing, be easy to produce such phenomenon as whole screen intensity.

So, when according to being used for signal processing system that irregularity in brightness proofreaies and correct and space and reducing signal processing system and be bonded to each other of present embodiment, shown in Figure 11 B, it is desirable to reduce system processing unit 52 and be arranged on irregularity in brightness correcting unit 20 back with being used to carry out space that the space reduces the signal processing of system.This structure makes the space of back reduce the luminance difference that system processing unit 52 suppresses or elimination is caused by the irregularity in brightness correction, thereby obtains fabulous image quality.

In addition, the same with irregularity in brightness correcting unit 20 according to present embodiment, space enhanced system processing unit 51 shown in Figure 11 A and the 11B and space reduce system processing unit 52 and are regarded as comprising in the video signal processing unit shown in Figure 1 16.

As a supplement, Figure 12 schematically shows the structure example of the adjusting mold system that is used for the irregularity in brightness correction.

Television receiver 1 according to present embodiment is shown in Figure 12.Television receiver 1 in manufacture process, be positioned at be used to regulate irregularity in brightness the processing stage.

When regulating irregularity in brightness, for example,, image is presented on the screen of liquid crystal display 18 of television receiver 1 based on the predetermined video signal that is used to measure.Then, utilize camera 60 to obtain the image that shows.To import correcting value information generation device 61 by the image pickup signal that camera 60 obtains.

Correcting value information generation device 61 is for example formed by computer system etc.Based on incoming video signal, the irregularity in brightness sexual state in the correcting value information generation device 61 measurement image zones, and determine in order to eliminate the correcting value of the vision signal that the irregularity in brightness sexual needs provide according to measurement result.The correcting value that obtain this moment is for example corresponding to the N Reference Alignment amount data with reference to figure 2 described each check point.Then, the correcting value information that will form N Reference Alignment amount data (the N Reference Alignment scale in the present embodiment) collection writes and is stored in the predetermined storage unit (for example, ROM, flash memory etc.) among the internal circuit 1a that is arranged on television receiver 1.In addition, the set of the functional circuit part as shown in Figure 1 of internal circuit 1a typical example in this case.

Can be understood that from the adjusting operation of such irregularity in brightness correction, the number of check point is big more, time of regulating and fault are just many more, and the burden of the processing that need carry out correcting value information generation device 61 is just heavy more, thereby have reduced production efficiency.Usually, need adjusting work (time) to measure and be used for obtaining structure corresponding to the Processing Algorithm of the correcting value data of a plurality of N Reference Alignment scales of brightness (lightness) direction etc. by the system shown in Figure 12.On the other hand, in the present embodiment, can obtain the correcting value data, make and regulate the corresponding minimizing of workload, and the burden of the processing on the correcting value information generation device 61 lighten for a N Reference Alignment scale corresponding to a certain luminance.

In addition, as mentioned above, the structure that is used for the irregularity in brightness correction according to present embodiment is effective to adopting LED as the situation that causes check point to increase backlight, when applying the present invention to generally comprise other image displays of CRT display, plasma display system, organic EL (electron luminescence) display unit etc., by only using correcting value, can obtain to reduce the effect of the data volume that is used for the irregularity in brightness correction similarly with linear scale or non-linear ratio.

And, though present embodiment only has a N Reference Alignment scale collection corresponding to a certain luminance of a video signal components, present embodiment can have the N Reference Alignment scale collection of two or more two or more brightness corresponding to a video signal components.When present embodiment has two or more N Reference Alignment scale collection, be set to be fit to the brightness of each N Reference Alignment scale owing to can comprise the parameter of the coefficient that is used for linear scale or non-linear ratio, so can expect that irregularity in brightness is proofreaied and correct more accurately and reliably.In other words, when obtaining the picture quality the same by structure, can reduce the number of required N Reference Alignment scale with the picture quality that obtains by N Reference Alignment scale with reference to figure 4 and the described structure use of Fig. 5 predetermined number according to present embodiment.

It should be appreciated by those skilled in the art that within,, can make various modifications, combination and change the present invention according to design needs and other factors by claim of the present invention and equivalent institute restricted portion.

Claims (16)

1. display image correcting device comprises:

Save set, be used to preserve and be used to proofread and correct the N Reference Alignment amount data of conduct based on the inhomogeneities of the predetermined factors of the image of vision signal demonstration, the predeterminated level of the described image of described N Reference Alignment amount data representation and the correcting value on the upright position, described correcting value obtains corresponding to the video level as benchmark; And

Means for correcting, be used for described vision signal being carried out treatment for correcting corresponding to the horizontal direction of described image and vertical direction and luminance directions, and according to carrying out described treatment for correcting with the linear ratio of level of the described vision signal that will proofread and correct or the three-dimensional correcting value data that the non-linear ratio obtains by making corresponding to the 2DC amount data of horizontal and vertical position, wherein, described 2DC amount data obtain based on described N Reference Alignment amount data.

2. display image correcting device according to claim 1, wherein:

For shown image setting a plurality of N Reference Alignment points, and described N Reference Alignment amount data representation is as the correcting value on the horizontal and vertical position of described a plurality of N Reference Alignment points; And

Described 2DC amount data are the correcting value data that constitute each pixel of described image, and by giving acquisition after the N Reference Alignment amount data weighting of the horizontal direction of described pixel and vertical direction N Reference Alignment point adjacent one another are.

3. display image correcting device according to claim 1, wherein:

As the described inhomogeneities of described predetermined factors is the inhomogeneities of one of the brightness of described image and colourity; And

Described means for correcting is carried out treatment for correcting, with the inhomogeneities of one of the brightness of proofreading and correct described image and colourity.

4. display image correcting device according to claim 1,

Wherein, described means for correcting comprises:

Multiplier is used for the described vision signal that will proofread and correct of digital form and the described 2DC amount data of addition and subtraction form are multiplied each other, and described 2DC amount data obtain based on described N Reference Alignment amount data, and

Adder is used for the output of described multiplier and the described vision signal addition that will proofread and correct of digital form; And

The output of described adder is used as the vision signal output after the correction.

5. display image correcting device according to claim 1, wherein:

Described means for correcting comprises multiplier, is used for the described vision signal that will proofread and correct of digital form and the described 2DC amount data of coefficient form are multiplied each other, and described 2DC amount data obtain based on described N Reference Alignment amount data; And

The output of described multiplier is to export as the vision signal after proofreading and correct.

6. display image correcting device according to claim 1,

Wherein, described means for correcting comprises:

Nonlinear circuit is used for providing predetermined nonlinear characteristic according to the level of the described vision signal that will proofread and correct of digital form;

Multiplier is used for the output of described nonlinear circuit and the described 2DC amount data of addition and subtraction form are multiplied each other, and described 2DC amount data obtain based on described N Reference Alignment amount data, and

Adder is used for the output of described multiplier and the described vision signal addition that will proofread and correct of digital form; And

The output of described adder is used as the vision signal output after the correction.

7. display image correcting device according to claim 1,

Wherein, described means for correcting comprises:

Nonlinear circuit is used for providing predetermined nonlinear characteristic according to the level of the described vision signal that will proofread and correct of digital form;

First multiplier is used for the output of described nonlinear circuit and the described 2DC amount data of coefficient form are multiplied each other, and described 2DC amount data obtain based on described N Reference Alignment amount data; And

Second multiplier is used for the output of described first multiplier is multiplied each other with the described vision signal that will proofread and correct, and the described vision signal that will proofread and correct is transfused to described second multiplier; And

The output of described second multiplier is used as the vision signal output after the correction.

8. display image correcting device according to claim 1, wherein:

The described vision signal that will proofread and correct is made up of the combination of three primary signals or a luminance signal and two color difference signals;

Described save set is preserved two kinds of described 2DC amount data, as the correcting value data corresponding to two prearranged signalss in described three primary signals or two prearranged signalss in a described luminance signal and described two color difference signals; And

Described means for correcting has the treatment for correcting system, be used in each or a described luminance signal and described two color difference signals of described three primary signals each is carried out treatment for correcting, select a kind of in two kinds of described 2DC amount data, and it is imported each described treatment for correcting system.

9. display image correcting device according to claim 1, wherein, described means for correcting is arranged on the back level of the predetermined signal processing unit of the intensity level that is used to strengthen shown image.

10. display image correcting device according to claim 1, wherein, described means for correcting is arranged on the prime of the predetermined signal processing unit of the intensity level that is used to reduce shown image.

11. an image display comprises:

The display image correcting device unit; And

The display device unit is used for the vision signal display image of proofreading and correct based on through described display image correcting device unit;

Wherein, described display image correcting device unit comprises:

Save set, be used to preserve and be used to proofread and correct the N Reference Alignment amount data of conduct based on the inhomogeneities of the predetermined factors of the image of vision signal demonstration, the predeterminated level of the described image of described N Reference Alignment amount data representation and the correcting value on the upright position, described correcting value obtains corresponding to the video level as benchmark; And

Means for correcting, be used for described vision signal being carried out treatment for correcting corresponding to the horizontal direction of described image and vertical direction and luminance directions, and according to carrying out described treatment for correcting with the linear ratio of level of the described vision signal that will proofread and correct or the three-dimensional correcting value data that the non-linear ratio obtains by making corresponding to the 2DC amount data of horizontal and vertical position, wherein, described 2DC amount data obtain based on described N Reference Alignment amount data.

12. image display according to claim 11, wherein, described display device unit comprises: display floater is used for based on described vision signal display image; And light source, be used for irradiates light to the back side of described display floater.

13. a display image correcting method may further comprise the steps:

Read and be used to proofread and correct the N Reference Alignment amount data of conduct based on the inhomogeneities of the predetermined factors of the image of vision signal demonstration, the predeterminated level of the described image of described N Reference Alignment amount data representation and the correcting value on the upright position, described correcting value are corresponding to as the level of the vision signal of benchmark, obtain from the save set that is used for preserving described N Reference Alignment amount data;

Based on the 2DC amount data of described N Reference Alignment amount data acquisition corresponding to horizontal and vertical position;

By making the linear ratio of level or the non-linear ratio of described 2DC amount data and the described vision signal that will proofread and correct, obtain corresponding to the horizontal direction of described image and the three-dimensional correcting value data of vertical direction and luminance directions; And

Based on described three-dimensional correcting value data described vision signal is carried out treatment for correcting.

14. display image correcting method according to claim 13 wherein, be a plurality of N Reference Alignment points of shown image setting, and described N Reference Alignment amount data representation is as the correcting value on the horizontal and vertical position of described a plurality of N Reference Alignment points; And

Described 2DC amount data are the correcting value data that constitute each pixel of described image, and by giving acquisition after the N Reference Alignment amount data weighting of the horizontal direction of described pixel and vertical direction N Reference Alignment point adjacent one another are.

15. display image correcting method according to claim 13, wherein,

As the described inhomogeneities of described predetermined factors is the inhomogeneities of one of the brightness of described image and colourity; And

Described aligning step is carried out treatment for correcting, with the inhomogeneities of one of the brightness of proofreading and correct described image and colourity.

16. a display image correcting device comprises:

Preservation portion, be used to preserve and be used to proofread and correct the N Reference Alignment amount data of conduct based on the inhomogeneities of the predetermined factors of the image of vision signal demonstration, the predeterminated level of the described image of described N Reference Alignment amount data representation and the correcting value on the upright position, described correcting value obtains corresponding to the video level as benchmark; And

Correction unit, be used for described vision signal being carried out treatment for correcting corresponding to the horizontal direction of described image and vertical direction and luminance directions, and according to carrying out described treatment for correcting with the linear ratio of level of the described vision signal that will proofread and correct or the three-dimensional correcting value data that the non-linear ratio obtains by making corresponding to the 2DC amount data of horizontal and vertical position, wherein, described 2DC amount data obtain based on described N Reference Alignment amount data.

Images