CN101674391B - CRT television - Google Patents
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- CN101674391B CN101674391B CN2008101400190A CN200810140019A CN101674391B CN 101674391 B CN101674391 B CN 101674391B CN 2008101400190 A CN2008101400190 A CN 2008101400190A CN 200810140019 A CN200810140019 A CN 200810140019A CN 101674391 B CN101674391 B CN 101674391B
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Abstract
The invention discloses a method for adjusting image edge row distortion, which increases null points in each row of video signals to adjust an initial point position and a termination point position of a valid signal so as to display a valid image in the middle of a screen. Based on the adjusting method, the invention also discloses a CRT television applying the adjusting method. By adopting the method for displaying the null image in a region in which horizontal linearity distortion at the left and right edges of the screen is comparatively serious, the display of the valid image in the region is avoided so as to reduce the horizontal linearity distortion phenomenon of the CRT television. The improved mode has low cost and can be directly adjusted based on the prior CRT television, and the adjustment effect of the horizontal linearity distortion applied to the CRT television is more obvious.
Description
Technical Field
The invention belongs to the technical field of video image processing, and particularly relates to a method for adjusting line linear distortion generated by left and right edges of a video image output by a CRT television and the CRT television using the method.
Background
The CRT television has a certain line linearity distortion problem in different degrees due to its own display characteristics, and particularly, the line linearity distortion is more serious at the left and right edges of the display screen. Especially for ultra-thin CRT televisions, which are becoming more and more popular in the market today, the deflection angle range is larger and the effect of linear distortion is more severe because the ultra-thin picture tube has a reduced thickness and a constant screen size (compared to a non-ultra-thin picture tube of the same size).
In order to solve the problem of line linear distortion, the current CRT television generally adopts a method of optimizing parameter selection of related components such as line linear inductance in a circuit of an internal line scanning part thereof so as to reduce the phenomenon of line linear distortion. Although a certain correction effect can be achieved by adopting the method, the image distortion in a section of area close to the left edge and the right edge of the display screen is difficult to correct.
In addition to the above hardware correction method, some tv manufacturers have proposed another correction method, that is, firstly, the analog tv image signal is processed by digital technique, and the analog image signal is converted into a digital image signal by an a/D converter; then the digital image signal is phase-shifted to solve the linear distortion problem of CRT TV line scanning, and further raise the performance index of TV product. However, this method for correcting line linearity distortion is relatively complex to implement, and prolongs the operation period of the program.
Disclosure of Invention
The invention aims to provide a simple and feasible adjusting method to solve the problem of line linear distortion of CRT television image edges so as to improve the output quality of video images.
In order to solve the technical problems, the invention adopts the following technical scheme:
a CRT television comprises a video processing chip, a register and a display module; the video processing chip configures a value larger than the total point number for the first register according to the total point number of each line of signals of the received video signals, and adjusts the value of the second register for controlling the starting point position of the effective signals in one line of signals and the value of the third register for controlling the ending point position of the effective signals in one line of signals, so that the effective image is displayed in the middle of the screen.
Further, an ineffective image is displayed at the left and right edges of the screen.
Still further, the display module determines a start position and an end position of the display of the effective image on the screen according to the values in the second register and the third register.
Furthermore, values in the second register and the third register are written by an external PC in the process of debugging the television so as to debug the display position of the effective image; after the values of the second register and the third register are determined, the values of the second register and the third register are stored in a storage device on a television circuit board through a PC, and the CPU controls the storage device to write the values of the second register and the third register into the second register and the third register in the actual use process of the television.
Preferably, the first, second and third registers are built in the video processing chip, and store three different values by setting different storage addresses.
Compared with the prior art, the invention has the advantages and positive effects that: the method for adjusting the line distortion at the edge of the image adopts a method for displaying an invalid image in an area with serious line linear distortion at the left edge and the right edge of a screen to avoid the display of an effective image in the area, thereby reducing the line linear distortion phenomenon of a CRT television. The improvement mode has low cost, can be directly adjusted on the basis of the traditional CRT television, and has more obvious adjustment effect of line linear distortion when being applied to the ultrathin CRT television.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a conventional CRT TV line scanning circuit;
FIG. 2 is a schematic diagram of an active image displayed on a screen when no invalid point is added;
FIG. 3 is a schematic diagram of the distribution of the effective image and the ineffective image on the screen after adding the ineffective point;
fig. 4 is a flowchart of an embodiment of an image edge line distortion adjusting method according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
For the problem of geometric distortion of the CRT television in the row direction, the invention adjusts the geometric distortion by the following two aspects:
1. and (3) hardware adjustment, namely adjusting parameters of related components in a line scanning circuit and a correction circuit in the CRT television so as to improve line linear distortion. This part of the technology can be realized by adopting various hardware adjusting methods used by the existing CRT television.
Fig. 1 is a schematic diagram illustrating a line scanning circuit of a conventional CRT television set. Wherein, L1 is a magnetic saturation inductor, also called line scan saturation distortion correction inductor, the inductance quantity of which is related to the current flowing through the deflection coil, when the current flowing through the deflection coil reaches the maximum value, the inductance quantity becomes the minimum value, therefore, it can compensate the line scan saturation distortion; c3 is a line scanning voltage output coupling capacitor, also called S-shaped distortion correcting capacitor, the charging and discharging process of the voltage at two ends of the capacitor just corresponds to the moment when the line scanning line is at two ends, the change of the charging and discharging speed of the capacitor has great influence on the change of the line scanning speed, therefore, the S-shaped scanning distortion can be corrected just by using the change characteristics of the charging and discharging sine and cosine; l2 is a filter inductor, or a line pincushion distortion correction signal coupling inductor, C4 is a filter capacitor, and L2 and C4 mainly function to effectively superimpose a parabolic wave (negative direction) on a line scanning circuit to correct the line pincushion distortion.
Based on the line scanning circuit structure shown in fig. 1, the linear distortion phenomenon of the display image line can be improved by adjusting and optimizing the parameter values of the inductors L1 and L2 and the capacitors C3 and C4.
Although the above hardware adjustment method can achieve a certain correction effect on the line linearity distortion of the output image of the CRT television, it is difficult to correct the line linearity distortion of the image in a region on the left and right sides of the screen, especially for the ultra-thin CRT television, the line linearity distortion of the image on the left and right sides is more serious, as shown in fig. 2. In order to avoid the distortion areas on the left and right sides appearing on the screen, a method is generally adopted in which the banner of the image is stretched by a preview chip inside the television, and then the distortion areas on the left and right sides are pulled out of the screen, so that the distorted image is not displayed on the screen. This method can cause damage to some components in the row scan circuitry, such as the row tubes being burned out due to excessive loading. Therefore, the present invention proposes the following software adjustment method.
2. And (4) software adjustment. The method mainly takes the point of correcting the image distortion in a section of area on the left side and the right side of the screen. Since the linear distortion in a region on the left and right sides of the screen is not well adjusted, the invalid point is added in a certain range on both sides of the image, so that the invalid content is displayed in the region with more serious distortion, as shown in fig. 3; then, the factory menu is entered, and the line width is increased, so that the effective image is displayed in the middle of the screen. Due to the fact that the invalid points are added, the occupied proportion of the valid points in one row is reduced, the stretching proportion of the banner can be reduced, the distortion of the image content is reduced, and the display effect of the image is improved.
The implementation method of the software adjustment is shown in fig. 4, and specifically includes the following steps:
s401, a first configurable register, a second configurable register and a third configurable register are arranged in the CRT television, and are respectively called as a register 1, a register 2 and a register 3, wherein the three registers can be independently arranged outside a video processing chip or can be realized by adopting a register integrated in the video processing chip. Wherein,
the register 1 is used for configuring the total point number of each line signal in the video signal after the video signal passes through a back-end processing module (the main function is a zooming function), and the total point number comprises an image signal part and a blanking part; specifically, the following may be mentioned: the method comprises the point number of one line of the effective image and the point number occupied by the line retrace (comprising a line synchronization signal and the like);
a register 2, configured to configure the position of the start point of the effective signal in each line of signals of the video signal after passing through the back-end processing module (the main function is the scaling function), i.e. the start position of the effective image display;
and the register 3 is used for configuring the position of an effective signal termination point in each line of signals of the video signal after the back-end processing module (the main function is a zooming function), namely the end position of effective image display.
Here, effective means actual image content. The registers 1, 2 and 3 are preferably implemented by using a register built in a video processing chip, and the three different values are respectively stored by setting different storage addresses.
Taking a video signal of 720P format as an example, the signal format standard specifies that the total number of points in a line is 1650 points and the number of valid points is 1280 points. From 0 to 369 points are invalid points, and the valid signal starts at 370 th point and ends at 1649 th point. The above is a standard specification, and in practical applications, a specific value has a certain deviation from the standard value due to processing and errors of a circuit. Usually, we will make some adjustments around the standard value at the time of setting. First, we can configure three registers according to the standard format, i.e. set the value in register 1 to 1650, the value in register 2 to 370, and the value in register 3 to 1649. Thus configured, the effective image output through the display screen appears on one side of the screen. In order to display the effective image in the middle of the screen, the values in the register 2 and the register 3 need to be adjusted. The adjustment process mainly depends on human eyes to observe the screen, and the values in the register 2 and the register 3 are changed through tentatively adjusting the values one by one, but the difference value is required to be 1280, and whether the effective image is displayed in the middle of the screen is subjectively judged.
The configuration of the registers 2 and 3 is generally realized by running a special software tool on an external PC during the television debugging process, and controlling a video processing chip on a television circuit board by the PC through an IIC protocol. After the position of the effective image is adjusted, the values of the registers 2 and 3 are determined, the values are stored in a storage device on a television circuit board, and the storage device is controlled by the CPU to write the values into the registers 2 and 3 in the actual use process of the television. The storage device can be a FLASH or EEPROM memory in a television set, etc.
S402, adjusting the number of points of each line of signals in the received video signal through the video processing chip, specifically, adding invalid points, for example, adding N invalid points, where N is a natural number, in each line of signals, and further configuring the value in the register 1 as the sum of the total number of points of each line of signals in the original video signal and N.
For a certain signal format emitted by a standard signal source, the total number of points in a row of the signal and the number of valid points in a row are both a certain value. The video processing chip can increase and decrease the total number of points and the effective number of points of one line of the input signal. For CRT TV set, the effective points in the horizontal direction of the signal output by the video processing chip are set as the effective points in the standard signal format. Therefore, the register 1 is set to a row total dot value larger than the standard signal, i.e., the invalid portion is added. Thus, the ratio (one row of valid points/one row of total points) becomes smaller. The length of one line scanned by the CRT is not changed, the ratio of one line of effective points to one line of total points is reduced, and the display effect is that the effective part (namely the actual image content) is compressed, so that the actual image content falls on the area with serious distortion at two sides of the kinescope as little as possible.
According to the specification of the signal format standard: the invalid point cannot appear in the middle of the valid points. The valid points represent image contents, the invalid points are auxiliary signals such as synchronous signals, the invalid points can only be arranged in front of or behind the valid points, and a flexible range is provided for how many invalid points are arranged before the valid points start and after the valid points finish. Therefore, the newly added N invalid points can be placed in front of or behind the valid points, or both.
The value of N can be determined according to the size of the linear distortion region appearing at the edge of the screen and the mode of the video signal. It can be set generally between 3% and 5% of the total number of points in a line of the input video signal.
S403, configuring the values in the register 2 and the register 3, i.e., adjusting the display position of the effective image on the screen so that the effective image is displayed in the middle of the screen.
The specific implementation process is as follows: firstly, a register 2 and a register 3 are assigned an initial value, wherein the initial value can be determined according to relevant provisions in a signal format standard, but the difference value of the initial values is equal to the number of effective points; and then displaying the image on a screen, wherein the display position of the effective image on the screen may be deviated to one side of the screen, and writing the adjusted values into the register 2 and the register 3 by using the PC, so as to adjust the effective image to be displayed in the middle of the screen, so that the effective image does not appear on two sides with serious linear distortion. It should be noted here that: the difference between register 3 and register 2 is always kept equal to the number of active points.
Also, taking a video signal of 720P format as an example, the number of signal effective points is 1280, and the total number of points is 1650 points. After adding N invalid points, the value of the register 1 is configured to be 1650+ N, the register 2 is assigned with an initial value 370, the register 3 is assigned with an initial value 1649, the two registers respectively indicate the start and end positions of the valid image, and the difference value of the two is the number 1280 of the valid points of the signal. Adjusting the values in the register 2 and the register 3 (but the difference value between the two should be kept as 1280 all the time), making the widths of the invalid parts increased at both sides of the effective image symmetrical, pulling the horizontal amplitude by the previewing chip to make the effective image fully spread on the screen and displayed in the middle of the screen, and pulling the invalid parts at the left and right sides out of the screen without displaying.
S404, the display module in the CRT television determines the starting position and the ending position of the effective image displayed on the screen according to the values stored in the register 2 and the register 3, and then the effective image is displayed on the screen.
It should be added that: a video signal is sent from the signal source to the television set and if it is not desired to scale it, e.g. a 4: 3 signal is to be displayed in 4: 3, the values of the three registers can be set according to the above steps. If it is desired to scale the image, for example, by a ratio of 4: 3 on a 16: 9 display, the values of the three registers are calculated to give them the appropriate values.
Take a PAL input signal as an example. The signal format is: the total number of lines of a line signal is 864, and the number of lines of a frame is 625. If pix _ total is set to 864 and line _ total is set to 625, the image output will fill the entire screen on the display.
If it is desired to display the image on a 16: 9 display at a 4: 3 ratio, the total point count for a line of the image may be increased to 4/3 times the original point count. Thus, it is necessary to set pix _ total to 864 × 4/3 to 1152 and line _ total to 625, so that the image is compressed left and right, and the two sides are black without image content, and the ratio of effective image is exactly 4: 3. Wherein, the law of the multiplied multiple is 4/3 multiplied by 4/3 which is 16: 9.
The invention adopts the adjustment of the analog circuit and the digital circuit processing means configured by the related register parameters to reduce the line linearity distortion problem of the CRT television, the method is simple, the cost is low, and the adjustment effect is particularly obvious on the ultrathin CRT television.
Of course, the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection of the present invention
Claims (5)
1. A CRT television set comprises a video processing chip and a display module, and is characterized in that: the video processing chip configures a value larger than the total point number for the first register according to the total point number of each line of signals of the received video signals, and adjusts the value of the second register for controlling the starting point position of the effective signals in one line of signals and the value of the third register for controlling the ending point position of the effective signals in one line of signals, so that the effective image is displayed in the middle of the screen.
2. A CRT television set as set forth in claim 1, wherein: the ineffective images are displayed at the left and right edges of the screen.
3. A CRT television set as set forth in claim 2, wherein: and the display module determines the starting position and the ending position of the effective image displayed on the screen according to the values in the second register and the third register.
4. A CRT television set as set forth in claim 1, 2 or 3, wherein: the values in the second register and the third register are written by an external PC in the process of debugging the television so as to debug the display position of the effective image; after the values of the second register and the third register are determined, the values of the second register and the third register are stored in a storage device on a television circuit board through a PC, and the CPU controls the storage device to write the values of the second register and the third register into the second register and the third register in the actual use process of the television.
5. The CRT television set of claim 4, wherein: the first register, the second register and the third register are arranged in the video processing chip, and three different numerical values are stored by setting different storage addresses respectively.
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| CN2008101400190A CN101674391B (en) | 2008-09-09 | 2008-09-09 | CRT television |
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| CN2008101400190A CN101674391B (en) | 2008-09-09 | 2008-09-09 | CRT television |
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| CN101674391A CN101674391A (en) | 2010-03-17 |
| CN101674391B true CN101674391B (en) | 2011-11-30 |
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| CN103000118B (en) * | 2011-09-14 | 2017-02-08 | 广东新岸线计算机系统芯片有限公司 | Displaying device, terminal utilizing same, and displaying method |
| CN104167187B (en) * | 2014-08-28 | 2016-08-24 | 青岛海信电器股份有限公司 | The recognition methods of a kind of wide-screen film display pattern and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1291407A (en) * | 1998-02-18 | 2001-04-11 | 精工爱普生株式会社 | Image processing device and image processing method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1291407A (en) * | 1998-02-18 | 2001-04-11 | 精工爱普生株式会社 | Image processing device and image processing method |
Non-Patent Citations (4)
| Title |
|---|
| JP平4-323979A 1992.11.13 |
| JP平5-37880A 1993.02.12 |
| JP平8-336092A 1996.12.17 |
| JP平9-261569A 1997.10.03 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |