KR20060008644A - Light emitting display - Google Patents

Abstract

The present invention relates to a light emitting display device capable of controlling luminance in response to amounts of red, green, and blue light included in ambient light.

A light emitting display device according to an exemplary embodiment of the present invention includes a detector for measuring the amount of red light, green light, and blue light included in ambient light, a gamma corrector storing a gamma value, and a red light, green light, and blue light amount. A control unit for resetting the gamma value, a driver for outputting a data signal and a selection signal generated by the reset gamma value, and an image display unit for displaying an image corresponding to the selection signal and the data signal output from the driver. Equipped.

With this configuration, in the present invention, since the gamma value is reset in response to the ambient light, and the image is displayed using the reset gamma value, the optimum image corresponding to the external environment can be displayed.

Description

Light emitting display device {LIGHT EMITTING DISPLAY}             

1 is a block diagram illustrating a light emitting display device according to an exemplary embodiment of the present invention.

FIG. 2 is a diagram illustrating a pass wavelength band of the red, green, and blue photosensors shown in FIG. 1.

3 is a block diagram illustrating in detail the comparison unit illustrated in FIG. 1.

4 is a block diagram illustrating in detail the gamma correction unit illustrated in FIG. 1.

5A and 5B are diagrams illustrating that the gamma value of the gamma correction unit is reset.

6 is a block diagram illustrating a light emitting display device according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: detector 12: R photosensor

14: G photosensor 16: B photosensor

20: reference signal generator 30: comparison unit

32, 34, 36: comparator 40: control unit

50: gamma correction unit 52: R gamma correction unit

54: G gamma correction unit 56: B gamma correction unit

60: driver 62: data driver

64: scan driver 70: image display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display device, and more particularly, to a light emitting display device capable of controlling luminance in response to amounts of red, green, and blue light included in ambient light.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such a flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, a light emitting display, and the like.

Among the flat panel display devices, the light emitting display device is a self-light emitting device that generates light by recombination of electrons and holes. Such a light emitting display device has an advantage in that it has a fast response speed and is driven with low power consumption.

In general, the light emitting display device is mainly used in portable devices such as mobile phones and PDAs (Personal Digital Assistants). That is, the light emitting display device displays an image in various environments such as indoors, outdoors, nights, days, and beaches. However, the conventional light emitting display device cannot display an optimal image corresponding to the external environment because the image is always displayed using a preset gamma value regardless of the external environment. In other words, the conventional light emitting display device cannot display a high quality image having improved visibility and color by displaying an image having a predetermined brightness regardless of an external environment.

Accordingly, it is an object of the present invention to provide a light emitting display device capable of controlling luminance in response to amounts of red, green, and blue light included in ambient light.

In order to achieve the above object, the first aspect of the present invention is a detection unit for measuring the red light amount, green light amount and blue light amount included in the ambient light, a gamma correction unit for storing a gamma value, the red light amount, green light amount and A control unit for resetting the gamma value corresponding to the amount of blue light, a driver for outputting a data signal and a selection signal generated by the reset gamma value, and displaying an image corresponding to the selection signal and the data signal output from the driver A light emitting display device having an image display unit is provided.

Preferably, the detection unit is a detection unit for generating a red detection signal corresponding to the amount of red light included in the ambient light, a green detection signal corresponding to the green light amount and a blue detection signal corresponding to the blue light amount, and a first preset reference A reference signal generator for generating a signal, a second reference signal and a third reference signal, and the red detection signal, the green detection signal, the blue detection signal and the first reference signal, the second reference signal and the third reference signal, respectively. And a comparison unit for generating the red correction signal, the green correction signal, and the blue correction signal. The controller resets the gamma value in response to the red correction signal, the green correction signal, and the blue correction signal.

Hereinafter, preferred embodiments of the present invention may be easily implemented by those skilled in the art with reference to FIGS. 1 to 6 as follows.

1 illustrates a light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a light emitting display device according to an exemplary embodiment of the present invention includes a detector 39, a controller 40, a gamma corrector 50, a driver 60, and an image display 70. The detector 39 includes a detector 10, a reference signal generator 20, and a comparator 30.

The detector 10 measures red (R), green (G), and blue (B) light included in the ambient light, and compares the detection signals MR, MG, and MB corresponding to the measured amount of light. ). To this end, the sensing unit 10 includes a red (R) photosensor 12, a green (G) photosensor 14, and a blue (B) photosensor 16.

The red (R) photosensor 12 measures the amount of red (R) light included in the ambient light, and supplies the red detection signal (MR) corresponding to the measured red (G) light amount to the comparator 30. Here, the red detection signal MR is set to a voltage and / or a current.

The green (G) photosensor 14 measures the amount of green (G) light included in the ambient light, and supplies the green detection signal MG corresponding to the measured amount of green (G) light to the comparator 30. Here, the green detection signal MG is set to a voltage and / or a current.

The blue (B) photosensor 16 measures the amount of blue (B) light included in the ambient light, and supplies the blue detection signal MB corresponding to the measured amount of blue (B) light to the comparator 30. Here, the blue detection signal MB is set to a voltage and / or a current.

Meanwhile, each of the red (R), green (G), and blue (B) photoelectric sensors 12, 14, and 16 measures the amount of light of red (R), green (G), and blue (B) included in the ambient light. To detect the specific wavelength of the ambient light as shown in FIG.

2 is a diagram illustrating specific wavelengths detected by the red, green, and blue photosensors.

Referring to FIG. 2, the blue (B) photosensor 16 detects only wavelengths of approximately 3000 kHz to 5100 kHz corresponding to blue B of the ambient light. The green (G) photosensor 14 detects only a wavelength within approximately 5100 kHz to 6500 kHz corresponding to the green G of the ambient light. The red (R) photosensor 12 detects only a wavelength within approximately 6200 kHz to 7800 kHz corresponding to red (R) of the ambient light. Here, the wavelengths detected by the above-described red (R), green (G), and blue (B) photosensors 12, 14, and 16 are examples of embodiments of the present invention, and the present invention is not limited thereto.

The reference signal generator 20 supplies the first to third reference signals Ref1, Ref2, and Ref3 to the comparator 30. Here, the first to third reference signals Ref1, Ref2, and Ref3 are set to voltage and / or current. The first to third reference signals Ref1, Ref2, and Ref3 are set identically or differently.

The comparator 30 includes a red detection signal MR, a green detection signal MG, and a blue detection signal MB supplied from the detector 10 and a first reference signal supplied from the reference signal generator 20. Ref1), the second reference signal Ref2, and the third reference signal Ref3 are compared with each other, and a correction signal corresponding to the compared result is supplied to the controller 40. To this end, the comparator 30 includes a first comparator 32, a second comparator 34, and a third comparator 36 as shown in FIG. 3.

3 is a view showing in detail the configuration of the comparison unit.

Referring to FIG. 3, the first comparator 32 compares the red detection signal MR and the first reference signal Ref1 and supplies a red correction signal corresponding to the comparison result to the controller 40. Here, the operation process will be described in detail assuming that the detection signals MR, MG, and MB and the reference signals Ref1 to Ref3 are set to voltage.

First, the first comparator 32 compares the voltage values of the red detection signal MR and the first reference signal Ref1 and supplies a red correction signal corresponding to the comparison result to the controller 40. For example, when the voltage value of the red detection signal MR exceeds the voltage value of the first reference signal Ref, the first comparator 32 may control the first red correction signal corresponding to the difference value. To supply. When the voltage value of the red detection signal MR is less than the voltage value of the first reference signal Ref, the first comparator 32 supplies the second red correction signal corresponding to the difference value to the controller 40. Here, the voltage value of the first reference signal Ref1 is determined as a voltage value that can be determined that a lot of red light is included in the ambient light when the voltage value of the red detection signal MR exceeds the first reference signal Ref1. do. In practice, the first reference signal Ref1 is determined experimentally in consideration of the inch, the resolution, and the like of the image display unit 70.

The second comparator 34 compares the voltage values of the green detection signal MG and the second reference signal Ref2 and supplies the green correction signal corresponding to the comparison result to the controller 40. For example, when the voltage value of the green detection signal MG exceeds the voltage value of the second reference signal Ref2, the second comparator 34 may control the first green correction signal corresponding to the difference value. To supply. When the voltage value of the green detection signal MG is less than the voltage value of the second reference signal Ref2, the second comparator 34 supplies the second green correction signal corresponding to the difference value to the controller 40. Here, the voltage value of the second reference signal Ref2 is determined as a voltage value that can be determined that a lot of green light is included in the ambient light when the voltage value of the green detection signal MG exceeds the second reference signal Ref2. do. In practice, the second reference signal Ref2 is determined experimentally in consideration of the inch, the resolution, and the like of the image display unit 70.

The third comparator 36 compares the voltage values of the blue detection signal MB and the third reference signal Ref3 and supplies the blue correction signal corresponding to the comparison result to the controller 40. For example, when the voltage value of the blue detection signal MG exceeds the voltage value of the third reference signal Ref3, the third comparator 36 controls the first blue correction signal corresponding to the difference value. To supply. When the voltage value of the blue detection signal MB is less than the voltage value of the third reference signal Ref3, the third comparator 36 supplies the second blue correction signal corresponding to the difference value to the controller 40. Here, the voltage value of the third reference signal Ref3 is determined as a voltage value that can be determined that a lot of blue light is included in the ambient light when the voltage value of the blue detection signal MB exceeds the third reference signal Ref3. do. In practice, the third reference signal Ref3 is determined experimentally in consideration of the inch, the resolution, and the like of the image display unit 70.

The controller 40 controls the gamma correction unit 50 in response to the red, green, and blue correction signals supplied from the comparator 30. Herein, the controller 40 resets the gamma value of the R gamma correction unit 52 included in the gamma correction unit 50 as shown in FIG. 4 in response to the result of the red correction signal.

4 is a diagram illustrating a detailed configuration of a gamma correction unit.

Referring to FIG. 4, the control unit 40 responds to the same gray level value when it is determined that the ambient light includes a lot of red light in response to the red correction signal (ie, inputting the first red correction signal). The gamma value of the R gamma correction unit 52 is reset to generate red light of low luminance.

In other words, when the red image data R having the first gradation G1 is input as shown in FIG. 5A, the controller 40 displays the red light having the second luminance D2 lower than the first luminance D1. The gamma value is reset so that the red light of the first luminance D1 higher than the second luminance D2 is displayed in correspondence with the first gradation G1 before the gamma value is reset. The gamma value of the R gamma correction unit 52 is reset such that the red light having a lower luminance is generated as the red light is included in the ambient light.

If it is determined that the controller 40 includes red light having a small amount of ambient light in response to the red correction signal (that is, the second red correction signal is input), the control unit 40 generates red light having a high luminance in response to the same gray value. The gamma value of the gamma correction unit 52 is reset. In other words, when the red image data R having the first gradation G1 is input as shown in FIG. 5B, the controller 40 displays the red light having the third luminance D3 higher than the first luminance D1. Reset the gamma value if possible. In practice, the controller 40 resets the gamma value of the R gamma correction unit 52 such that the red light having a higher luminance is generated as the less red light is included in the ambient light.

To this end, the lookup table (not shown) may be included in the controller 40. That is, the controller 40 resets the gamma value by supplying the gamma value of any one of the lookup tables stored therein to the R gamma correction unit 52 in response to the correction signal.

The controller 40 resets the gamma value of the G gamma correction unit 54 included in the gamma correction unit 50 in response to the result of the green correction signal. In detail, when the controller 40 determines that the ambient light includes a large amount of green light in response to the green correction signal (first green correction signal), the controller 40 generates green light having a low luminance in response to the same gray value. The gamma value of the gamma correction unit 54 is reset. If the controller 40 determines that the green light has a small amount of ambient light in response to the green correction signal (second green correction signal), the G gamma correction unit generates green light having high luminance in response to the same gray scale value. Reset the gamma value of (54).

The controller 40 resets the gamma value of the B gamma correction unit 56 included in the gamma correction unit 50 in response to the result of the blue correction signal. In detail, when the controller 40 determines that the ambient light includes a lot of blue light in response to the blue correction signal (first blue correction signal), the controller 40 generates blue light having a low luminance in response to the same gray value. The gamma value of the gamma correction unit 56 is reset. If it is determined that the controller 40 includes blue light having a small amount of ambient light in response to the blue correction signal (second blue correction signal), the B gamma correction unit generates blue light having high luminance in response to the same gray scale value. The gamma value of (56) is reset.

The gamma correction unit 50 converts the image data R, G, and B supplied from the outside into a data signal (current and / or voltage) using the reset gamma value, and converts the converted data signal to the driver 60. Supply.

The driver 60 controls the image display unit 70 to include an image corresponding to the data signal supplied from the gamma correction unit 50. To this end, the driver 60 includes a data driver 62 and a scan driver 64. The scan driver 64 sequentially supplies the scan signal to the scan lines formed on the image display unit. The data driver 62 supplies the data signals supplied from the gamma correction unit 50 to the data lines when the scan signals are supplied to the scan lines. Then, the image display unit 70 displays a predetermined image corresponding to the data signal.

Here, the image displayed on the image display unit 70 is determined by the data signal generated by the reset gamma value. That is, in the image display unit 70 of the present invention, the color of the displayed image is changed corresponding to the ambient light, and accordingly, the image display unit 70 can display a high quality image with high visibility.

Meanwhile, in the present invention, the image data R, G, and B may be supplied to the data driver 62 as shown in FIG. 6. In detail, the data driver 62 receiving the red image data R from the outside extracts a current or voltage value corresponding to the gray value of the red image data R from the R gamma correction unit 52. The extracted current or voltage value is supplied to the data lines as a data signal.

The data driver 62 receiving the green image data G extracts a current or voltage value corresponding to the gray value of the green image data G from the G gamma correction unit 54, and extracts the extracted current or voltage value. It is supplied to the data lines as a data signal. The data driver 62 supplied with the blue image data B extracts a current or voltage value corresponding to the gray value of the blue image data B from the B gamma correction unit 56, and extracts the extracted current or voltage. The value is supplied to the data lines as a data signal. In fact, the image data R, G, and B supplied from the outside may be supplied to either the gamma corrector 50 or the data driver 62.

The above detailed description and drawings are merely exemplary of the present invention, which are used only for the purpose of illustrating the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Accordingly, those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical protection scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

As described above, the light emitting display device according to an exemplary embodiment of the present invention resets a gamma value corresponding to ambient light and displays an image using the reset gamma value, thereby displaying an optimal image corresponding to an external environment. . In other words, in the present invention, the color of the image displayed on the image display unit changes in response to the ambient light, thereby displaying a high quality image having high visibility.

Claims (11)

A detector for measuring the amount of red light, green light, and blue light included in the ambient light; A gamma correction unit storing a gamma value; A control unit for resetting the gamma value corresponding to the red light amount, the green light amount, and the blue light amount; A driver for outputting a data signal and a selection signal generated by the reset gamma value; And an image display unit for displaying an image corresponding to the selection signal and the data signal output from the driver. The method of claim 1, The detection unit A detection unit for generating a red detection signal corresponding to the amount of red light included in the ambient light, a green detection signal corresponding to the green light amount, and a blue detection signal corresponding to the blue light amount; A reference signal generator for generating a preset first reference signal, second reference signal, and third reference signal; A comparison unit configured to generate the red correction signal, the green correction signal, and the blue correction signal by comparing the red detection signal, the green detection signal, the blue detection signal with the first reference signal, the second reference signal, and the third reference signal, respectively. Light emitting display device. The method of claim 2, And the controller is configured to reset the gamma value in response to the red correction signal, the green correction signal, and the blue correction signal. The method of claim 2, The sensing unit A red photosensor for generating the red detection signal corresponding to the amount of red light included in the ambient light; A green photosensor for generating the green detection signal corresponding to the amount of green light included in the ambient light; And a blue photosensor for generating the blue detection signal corresponding to the amount of blue light included in the ambient light. The method of claim 2, The comparison unit A first comparator for comparing the red detection signal with the first reference signal and generating the red detection signal corresponding to the difference value; A second comparator for comparing the green detection signal with the second reference signal to generate the green detection signal corresponding to the difference value; And a third comparator for comparing the blue detection signal with the third reference signal to generate the blue detection signal corresponding to the difference value. The method of claim 2, The gamma correction unit A red gamma correction unit configured to store a gamma value for converting red image data from the image data input from the outside into the data signal; A green gamma correction unit configured to store a gamma value for converting green image data among the image data into the data signal; And a blue gamma correction unit configured to store a gamma value for converting blue image data among the image data into the data signal. The method of claim 5, The control unit resets the gamma value of the red gamma correction unit in response to the red correction signal, resets the gamma value of the green gamma correction unit in response to the green correction signal, and responds to the blue correction signal in response to the blue correction signal. A light emitting display for resetting the gamma value of the correction unit. The method of claim 7, wherein The control unit resets the gamma value so that red light having a low luminance is generated by a value exceeding when the red detection signal exceeds the first reference signal and exceeds when the green detection signal exceeds the second reference signal. Light emission which resets the gamma value so as to generate green light having a luminance lower than that value, and resets the gamma value so as to generate blue light having a lower luminance as an excess value when the blue detection signal exceeds the third reference signal. Display. The method of claim 7, wherein The control unit resets the gamma value so that red light having a high luminance is generated by a value exceeding when the first reference signal exceeds the red detection signal, and exceeds when the second reference signal exceeds the green detection signal. Light emission which resets the gamma value so that the green light having a high luminance as high as the generated value is generated, and resets the gamma value so as to generate blue light having a high luminance exceeding when the third reference signal exceeds the blue detection signal. Display. The method of claim 1, The gamma correction unit receives data from the outside and generates the data signal corresponding to the gray level of the supplied data. The method of claim 1, The driving unit receives data from the outside and generates the data signal corresponding to the gray level of the supplied data.

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