KR20170023615A - Display Device Including Compensating Unit And Method Of Compensating Image Using The Same - Google Patents

Display Device Including Compensating Unit And Method Of Compensating Image Using The Same Download PDF

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Publication number
KR20170023615A
KR20170023615A KR1020150119013A KR20150119013A KR20170023615A KR 20170023615 A KR20170023615 A KR 20170023615A KR 1020150119013 A KR1020150119013 A KR 1020150119013A KR 20150119013 A KR20150119013 A KR 20150119013A KR 20170023615 A KR20170023615 A KR 20170023615A
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South Korea
Prior art keywords
compensation
gradation
value
data
image data
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KR1020150119013A
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Korean (ko)
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나만호
윤서윤
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주식회사 디닷
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery

Abstract

The present invention provides a display device comprising: a display panel for displaying a test image including gradation; An imaging device for measuring luminance of the test image and calculating luminance data; A compensation unit for calculating compensation data including a compensation value corresponding to the gray level using the luminance data, weight data including weight values set differently for each gray-scale area, and compensation unit for calculating weight compensation data using the compensation data, ; And a timing controller for adding the weighted compensation data to the original image data to calculate compensated image data.

Description

Technical Field [0001] The present invention relates to a display device including a compensator and a method of compensating an image using the compensator.

The present invention relates to a display device, and more particularly, to a display device including a compensator that compensates for image unevenness, and an image compensation method using the same.

2. Description of the Related Art [0002] A display device is an apparatus for displaying an image including various information using a plurality of pixels. Recently, a flat display device such as a liquid crystal display (LCD), an organic light emitting diode (OLED) Flat panel displays (FPDs) are widely used because of their advantages such as thinning and low power consumption.

Such a display device is manufactured using various materials such as a semiconductor material or an organic luminescent material. The deviation of the material used or the deviation of the manufacturing process may cause the completed display device to exhibit different optical characteristics.

For example, even when the same voltage is applied to a specific pixel of a completed display device, a different luminance may be exhibited for each sample. Such a luminance deviation of the sample appears as a screen unevenness such as a stain or a color abnormality, .

A compensation method using an image pickup device such as a camera has been proposed in order to improve such a screen unevenness.

In the compensation method using an image pickup device, a picture of a display device is photographed by a CCD (charge coupled device) or the like to detect a screen unevenness such as a stain or a color abnormality, and the compensation value calculated from the unevenness is calculated The display image is displayed using the compensated image data, thereby preventing or minimizing the unevenness of the screen.

Here, the compensation value has a specific compensation region up and down. The larger the compensation region, the larger the range of the screen unevenness that can be improved, which is advantageous for improving the picture quality of the display apparatus.

However, the compensated image data corresponding to a part of the lower gradation or higher gradation of the original image data may exceed the lowest gradation or the highest gradation due to the compensation region of the compensation value. In this case, Is displayed in the lowest gradation level or the highest gradation level, gray level saturation or gradation accumulation occurs in the lower gradation or higher gradation of the original image data.

Such gradation saturation or gradation accumulation will be described with reference to the drawings.

FIG. 1 is a graph of compensated image data for explaining gradation saturation in a conventional compensating method using an image pickup apparatus. FIG. 2 is a graph showing the relationship between original image data for explaining gradation saturation in the compensation method using the conventional image pickup apparatus, Is a graph of image data.

As shown in Fig. 1, when the display device displays an image having a display area between the lowest gradation (Gmin) and the highest gradation (Gmax), the lowest compensated gradation Gcmin ) And the highest compensation gradation (Gcmax) is calculated.

Here, the lowest compensation gradation Gcmin is smaller than the lowest gradation Gmin, the highest compensation gradation Gcmax is higher than the highest gradation Gmax, and the target compensation image data is calculated by adding compensation data to the original image data.

Since the driving unit of the display apparatus can process only data having a display range between the lowest gradation (Gmin) and the highest gradation (Gmax), the lowest compensation gradation Gcmin and the lowest compensation gradation Gcmin exceeding the lowest gradation The gradation between the highest gradation Gmax and the highest gradation Gmax that exceeds the maximum gradation Gmax in the positive direction is all the highest gradation Gmax, (Gmax).

Thus, instead of outputting the target compensated image data, the driving unit of the display device outputs the compensated image data in which the gradation saturation or gradation accumulation occurs in the lower gradation region (A) and the upper gradation region (B) As a result, the display quality of the image deteriorates.

As shown in Fig. 2, original image data having gradations between the lowest gradation (Gmin) and the highest gradation (Gmax) is input from the external system to the display device, and the driving unit of the display device And calculates compensation data having a specific compensation range.

Here, the compensation range can be represented by an error bar (EB) between the lowest compensation value and the maximum compensation value, and the compensation ranges in all gradations of the original image data are all the same.

The target compensated image data (not shown) may be any curve connecting the points in the error bars EB of each gradation.

However, in the first area C in which the original image data having the lower gradation is displayed, a part of the target compensated image data has gradations smaller than the lowest gradation (Gmin). In this case, The gradation of the compensated image data is all saturated to the lowest gradation Gmin.

Further, in the second area D where the original image data having the higher gradation is displayed, a part of the target compensated image data has a higher gradation than the highest gradation (Gmax). In this case, The grayscale of the compensated image data is all saturated to the highest gradation Gmax.

Therefore, there is a problem that the compensation effect is reduced and the display quality of the image is lowered.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such problems, and it is an object of the present invention to provide a display device including a compensator which can prevent or minimize gray scale saturation by limiting the compensation range in the lower limit gray scale range and upper limit gray scale range, And to provide the above objects.

The present invention further provides a display device including a compensation section capable of preventing or minimizing the gray level saturation and simultaneously preventing reduction in the compensation effect by selectively limiting the compensation range in consideration of the compensation value in the lower limit gradation region and upper limit gradation region, And an image compensation method using the same.

In order to solve the above problems, the present invention provides a display device comprising: a display panel for displaying a test image including gradation; An imaging device for measuring luminance of the test image and calculating luminance data; A compensation unit for calculating compensation data including a compensation value corresponding to the gray level using the luminance data, weight data including weight values set differently for each gray-scale area, and compensation unit for calculating weight compensation data using the compensation data, ; And a timing controller for adding the weighted compensation data to the original image data to calculate compensated image data.

The compensation unit may include: a compensation value calculation unit that calculates the compensation data; Wherein the gradation region of the original image data is divided into a lower limit gradation region, an unregulated gradation region, and a higher limit gradation region, wherein the lower limit gradation region and the upper limit gradation region have values of 0 to 1, A weight providing unit for providing the weight data including the weight having a value of 1; And a mixer for calculating the weighted compensation data including the weighted compensation value by multiplying the weighted value of the weighted data by the compensation value of the compensation data.

Further, the weight has a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation in the lower limit gradation region, has a value of 1 in the non-fixed gradation region, and has a value of 1 in the upper limit gradation region, And may have a value less than 1,

The weight value providing unit receives the compensation data from the compensation value calculating unit and determines whether the compensation value is positive or negative. In the lower limit gradation area, the weight value is a value of 1 if the compensation value is positive Has a value smaller than 1 which gradually decreases with the decrease of the gradation if the compensation value is negative and has a value of 1 in the non-fixed gradation region, and in the upper limit gradation region, if the compensation value is positive And has a value smaller than 1, which decreases gradually as the gradation increases, and may have a value of 1 if the compensation value is negative.

The weight value provider may receive the compensation data from the compensation value calculator, receive the original image data from the timing controller, calculate the auxiliary compensation image data using the compensation data and the original image data, And determines whether or not the auxiliary compensation video data deviates from the display range between the lowest gradation and the highest gradation, and in the lower limit gradation range, the weight is set to the decrease of the gradation if the auxiliary compensation video data is smaller than the lowest gradation And has a value of 1 when the auxiliary compensation video data is equal to or greater than the lowest gray level and has a value of 1 in the non-gray gray level range, and in the upper limit gray level range, Has a value of 1 if the auxiliary compensation video data is less than or equal to the highest gray level, If the image data is larger than the highest gradation, it may have a value smaller than 1, which gradually decreases as the gradation increases.

According to another aspect of the present invention, there is provided a method of displaying a test image, the method comprising: displaying a test image including gradation; Measuring brightness of the test image to calculate brightness data; Calculating compensation data including a compensation value corresponding to the gradation using the luminance data; Calculating weighted compensation data using weighted data including weighted values set differently for each gradation region and the compensation data; And adding the weighted compensation data to the original image data to calculate compensated image data.

The calculating of the weighted compensation data may include dividing the gradation region of the original image data into a lower limit gradation region, a non-fixed gradation region, and a higher limit gradation region, and in the lower limit gradation region and the upper limit gradation region Providing the weight data having a value of 0 to 1 and including the weight having a value of 1 in the non-grayscale region; And multiplying the weight value of the weight data by the compensation value of the compensation data to calculate the weighted compensation data including the weighted compensation value.

Further, the weight has a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation in the lower limit gradation region, has a value of 1 in the non-fixed gradation region,

And may have a value smaller than 1, which gradually decreases in accordance with the increase of the gradation in the upper limit gradation region.

The step of providing the weight data may include a step of determining whether the compensation value of the compensation data is positive or negative, and in the lower limit gradation region, the weight is a value of 1 if the compensation value is positive Has a value smaller than 1 which gradually decreases with the decrease of the gradation if the compensation value is negative and has a value of 1 in the non-fixed gradation region, and in the upper limit gradation region, if the compensation value is positive And has a value smaller than 1, which decreases gradually as the gradation increases, and may have a value of 1 if the compensation value is negative.

The step of providing the weight data may include calculating supplementary compensation image data using the compensation data and the original image data; And determining whether the auxiliary compensation video data is out of the display area between the lowest gradation and the highest gradation, wherein in the lower limit gradation area, if the auxiliary compensation video data is smaller than the lowest gradation, And has a value of 1 when the auxiliary compensation video data is equal to or greater than the lowest gray level and has a value of 1 in the non-gray level range, and has a value of 1, 1 'when the auxiliary compensation image data is less than or equal to the highest gray level, and may have a value less than 1, which decreases gradually with the increase of the gray level if the auxiliary compensation image data is larger than the highest gray level.

The present invention has the effect of preventing or minimizing gray scale saturation by limiting the compensation range in the lower limit gray scale range and upper limit gray scale range.

The present invention has the effect of preventing or minimizing the gray level saturation and at the same time preventing reduction in the compensation effect by selectively limiting the compensation range in consideration of the compensation value in the lower limit gray level range and upper limit gray level range.

1 is a graph of compensated image data for explaining gradation saturation in a conventional compensation method using an image pickup apparatus.
2 is a graph of original image data and compensated image data for explaining gradation saturation in the conventional compensation method using an image pickup apparatus.
3 is a view showing a display device according to a first embodiment of the present invention.
4 is a view showing a timing control section and a compensation section of a display apparatus according to the first embodiment of the present invention.
5 is a weight graph of a compensation unit of a display device according to the first embodiment of the present invention.
6 is a graph of original image data and compensation image data for explaining a compensation method according to the first embodiment of the present invention.
7 is a graph of original image data and compensated image data for explaining a compensation method according to the second embodiment of the present invention.

Hereinafter, a display device including a compensator according to the present invention and an image compensation method using the same will be described with reference to the accompanying drawings.

3 is a view showing a display device according to the first embodiment of the present invention.

3, the display device 110 according to the first embodiment of the present invention includes a timing control unit 120, a gate driving unit 130, a data driving unit 140, a display panel 150, (160) and a compensation unit (170).

The timing controller 120 receives a video signal IS transmitted from an external system such as a graphic card or a TV system and a data enable signal DE, a clock CLK, a horizontal synchronizing signal HSY, a vertical synchronizing signal VSY And generates the gate control signal GCS, the data control signal DCS and the image data RGB by using a plurality of timing signals such as a gate signal And transmits the generated data control signal DCS and image data RGB to the data driver 140.

The gate driver 130 generates a gate voltage using the gate control signal GCS transmitted from the timing controller 120 and supplies the generated gate voltage to the gate line GL of the display panel 150. [

The data driver 140 generates a data voltage using the data control signal DCS and the image data RGB received from the timing controller 120 and supplies the generated data voltage to the data line DL).

The display panel 150 displays an image using a gate voltage and a data voltage. After the display device 110 is manufactured, a test image necessary for calculation of a compensation value for compensating for screen unevenness can be displayed using test image data have.

Specifically, the display panel 150 includes a gate wiring GL and a data wiring DL which define pixels P and which intersect with each other and a switching element (not shown) connected to the gate wiring GL and the data wiring DL When the gate voltage supplied from the gate driver 130 is applied to the switching element through the gate line GL, the switching element is turned on, and the data voltage supplied from the data driver 140 is turned on And is applied to the pixel electrode (not shown) through the wiring DL and the switching element.

Here, the display panel 150 may be a liquid crystal panel or an organic light emitting diode panel. When the display panel 150 is a liquid crystal panel, the transmittance of the liquid crystal layer between the pixel electrode and the common electrode is adjusted to display the grayscale, When the organic light emitting diode display panel 150 is an organic light emitting diode panel, the output of the light emitting diode connected to the pixel electrode is controlled to display the gray scale.

The image sensing apparatus 160 calculates the luminance data LD by measuring the luminance of the test image displayed by the display panel 150 for each pixel P to compensate for the unevenness of the screen and outputs the calculated luminance data LD And transmits it to the compensation unit 170.

For example, the CCD may be used as the image pickup device 160, and the luminance data LD may include a luminance value by an entire gradation or some gradation.

The compensation unit 170 calculates the weighted compensation data wCD using the luminance data LD received from the image sensing apparatus 160 and transmits the calculated weighted compensation data wCD to the timing control unit 120 , And the weighted compensation data (wCD) includes a weighted compensation value corresponding to the whole gradation.

Here, the compensating unit 170 calculates the compensation data (CD in Fig. 4) including the compensation value for the entire gradation from the luminance data LD, and outputs the weight data (also shown in Fig. 4) (WCD = WD * CD), so that the weighted compensation data (wCD) for the entire gradation is obtained by applying the gradation saturation or gradation accumulation Is prevented or minimized, which will be described in detail later.

The timing controller 120 adds the weighted compensation data wCD received from the compensator 170 to the original image data (RGB in Fig. 4) to calculate the compensated image data (cRGB in Fig. 4) (cRGB = RGB + wCD), and transmits the calculated compensated image data cRGB to the data driver 140.

The data driver 140 generates a compensated data voltage using the compensated image data cRGB and transmits the compensated data voltage to the display panel 150. The display panel 150 displays the compensation data voltage cRGB corresponding to the compensated image data cRGB, It is possible to prevent or minimize grayscale saturation or gray scale accumulation.

3, the compensation unit 170 is configured separately from the timing control unit 120. However, in another embodiment, the compensation unit 170 may be integrated in the timing control unit 120. [

The operations of the timing controller 120 and the compensator 170 will be described in detail with reference to the drawings.

FIG. 4 is a view showing a timing control unit and a compensating unit of the display apparatus according to the first embodiment of the present invention, FIG. 5 is a weight graph of the compensating unit of the display apparatus according to the first embodiment of the present invention, .

4, the compensating unit 170 of the display device 110 according to the first embodiment of the present invention includes a compensation value calculating unit 172, a weight providing unit 174, a mixer 176 , And the timing control unit 120 includes an adder 122. [

The compensation value calculation unit 172 calculates compensation data CD including the compensation value corresponding to the entire gradation level using the luminance data LD transmitted from the image sensing unit 160. [

For example, the compensation value calculator 172 calculates a negative compensation value if the luminance value by the specific gradation is larger than the reference luminance value, and if the luminance value by the specific gradation is smaller than the reference luminance value, And the magnitude of the absolute value of the compensation value may be proportional to the difference between the luminance value and the reference luminance value.

Here, when the luminance data LD provided by the image sensing apparatus 160 includes the luminance value for all the gradations, the compensation value calculation section 172 calculates the compensation value for the entire gradation from the luminance data LD It is possible to calculate the compensation data (CD).

When the luminance data LD provided by the image sensing apparatus 160 includes a luminance value for some representative gradations, the compensation value calculation section 172 calculates a representative compensation value for the representative gradation from the luminance data LD And the compensation data CD including the representative compensation value and the interpolation compensation value for the entire gradation can be calculated by calculating the interpolation compensation value for the gradation between the representative gradations through the linear interpolation method .

The weight providing unit 174 outputs weight data WD including weight values set differently for each gradation region.

That is, the weight providing unit 174 receives the original image data RGB from the timing controller 120, grasps the gradation region of the original image data RGB, and corresponds to the gradation region of the original image data RGB Weighting data WD including the weights to the mixer 176. The weights may be set to be less than 1 in the upper and lower gradation regions and to be set to 1 in the central gradation region.

5, the weight is a value (a value between 0 and 1) which is gradually decreased in accordance with the decrease in gray level in the lower limit gradation region between the lowest gradation (Gmin) and the lower limit gradation (Gl) And has a constant value of 1 irrespective of the gradation in the non-gradation gradation region between the lower limit gradation G1 and the upper limit gradation Gh, and has a constant upper limit gradation Gh between the upper limit gradation Gh and the upper limit gradation Gh, (A value between 1 and 0) which is gradually decreasing with increasing gradation.

The lower limit gradation G1 and the upper limit gradation Gh can be experimentally determined according to the compensation range of the compensation data CD and the brightness of the display device. In the first embodiment, the lowest gradation Gmin and the highest gradation Gmax The weight in the lowest gradation Gmin and the highest gradation Gmax may be a value greater than 0 (a value between 0 and 1) in other embodiments.

Accordingly, when the original image data (RGB) corresponds to the lower limit gradation region, the weight providing unit 174 supplies the weight data WD including the weight value smaller than 1, which gradually decreases in accordance with the gradation decrease, to the mixer 176, And provides the weight data WD including the weight value of 1 to the mixer 176 when the original image data RGB corresponds to the non-gradated gradation area, and supplies the weighted image data WD to the mixer 176, To the mixer 176, weight data WD including weight values smaller than 1, which gradually decrease as the gradation increases.

The mixer 176 calculates the weighted compensation data wCD using the compensation data CD received from the compensation value calculator 172 and the weight data WD received from the weight supplier 174.

That is, the mixer 176 calculates the weighted compensation data wCD including the weighted compensation value for all the gray levels by multiplying the weighted compensation value of the compensation data CD by the weighted value of the weighted data WD (wCD = WD * CD), and transmits the calculated weighted compensation data (wCD) to the timing controller 120.

Accordingly, the compensation value of the gradation belonging to the lower limit gradation region or the upper limit gradation region is multiplied by a weight value smaller than 1, so that the weighted compensation value is calculated, and the compensation value of the gradation belonging to the unregulated gradation region is multiplied by a weight of 1 The compensation range of the compensation value of the gradation belonging to the lower limit gradation region or the upper limit gradation region becomes smaller than the compensation range of the compensation value of the gradation belonging to the unregulated gradation region and the compensation range of the lower limit gradation region or upper limit The compensation value of the gradation belonging to the gradation region is limited.

The reason for limiting the compensation value in the lower limit gradation region or the upper limit gradation region is to prevent the gradation saturation or gray scale accumulation or to prevent the gradation saturation or gradation accumulation, So as to improve the quality of the image.

That is, the closer to the high gradation such as white, the lower the cognitive ability to the luminance difference, and the closer to the low gradation such as black, the more the cognitive ability It is more advantageous to improve the overall image quality by preventing the gray scale saturation or the gray scale accumulation from occurring even if the compensation effect is somewhat reduced in the low gray level or the high gray level.

Therefore, in the display device according to the first embodiment of the present invention, the compensation value in the lower limit gradation region or the upper limit gradation region is limited in accordance with the gradation, thereby preventing or minimizing gradation saturation or gradation accumulation, The compensation value is not limited so that the compensation effect can be maximized.

The adder 122 of the timing controller 120 synthesizes the original image data RGB and the weighted compensation data wCD received from the mixer 176 of the compensator 170 to obtain the compensated image data cRGB And transmits it to the data driver 140 (cRGB = RGB + wCD).

The data driver 140 generates a compensated data voltage using the compensated image data cRGB and transmits the compensated data voltage to the display panel 150. The display panel 150 displays the compensation data voltage cRGB corresponding to the compensated image data cRGB, It is possible to secure a compensation effect for preventing or minimizing a screen unevenness such as an unevenness or a color abnormality, and at the same time, the gray scale saturation can be prevented or minimized.

An image displayed by the display device 110 including the compensation unit 170 will be described with reference to the drawings.

FIG. 6 is a graph of original image data and compensation image data for explaining a compensation method according to the first embodiment of the present invention, and will be described with reference to FIGS. 3 to 5 together. FIG.

6, original image data (RGB) having gradations between the lowest gradation (Gmin) and the highest gradation (Gmax) is input to the display device 110 from the external system, and the compensation of the display device 110 Unit 170 calculates weighted compensation data wCD having a different compensation range for each gradation region through the compensation method using the image sensing device 160. [

5, in the lower limit gradation region between the lowest gradation (Gmin) and the lower limit gradation (G1), the weight providing portion 174 sets a value (0 1) having the same value regardless of the gradation in the non-gradated gradation region between the lower limit gradation (G1) and the upper limit gradation (Gh), and the upper limit gradation (Gh) and the highest gradation Gmax) to the mixer 176, weight data WD including a weight having a value smaller than 1 (a value between 1 and 0) which gradually decreases with increasing gradation.

Here, the compensation range can be expressed by an error bar (EB) between the lowest weight compensation value and the maximum weight compensation value. The range from the center of the error bar (EB) to the lowest weight compensation value at the lower end Since the interval from the interval and the error bar (EB) center (original image data) to the maximum weight compensation value at the top is the same in all gradation areas, the error bars (EB) It has a symmetrical shape as a reference.

Specifically, in the lower limit gradation region between the lowest gradation (Gmin) and the lower limit gradation (G1), the weight decreases gradually from 0 to 1 according to the gradation decrease. The interval between the lowest weight compensation value and the center of the error bar EB (original image data) to the maximum weight compensation value becomes smaller and the compensation of the weighted compensation value, which is the product of the weight and the compensation value, The range decreases gradually.

In the upper limit gradation region between the lower limit gradation G1 and the upper limit gradation Gh, since the weight is 1 regardless of the gradation, the center of the error bar EB (original image data) And the interval between the center of the error bar (original image data) and the maximum weight compensation value are the same, and the compensation range of the weighted compensation value, which is the product of the weight and the compensation value, is constant.

In the upper limit gradation region between the upper limit gradation Gh and the highest gradation Gmax, the weight decreases gradually from 1 to 0 as the gradation increases. Therefore, from the center portion of the error bar EB to the lowest weight compensation value And the interval between the center of the error bar EB and the maximum weight compensation value become smaller and the compensation range of the weight compensation value which is the product of the weight and the compensation value gradually decreases.

Therefore, in the first region C corresponding to the lower limit gradation region and the second region D corresponding to the upper limit gradation region, the compensation which is calculated by adding the weighted compensation data wCD to the original image data RGB, The gradation of the image data (cRGB) is not saturated, thereby preventing or minimizing gradation saturation or gradation accumulation.

The compensated image data cRGB calculated by adding the weighted compensation data wCD to the original image data RGB between the first and second regions C and D corresponding to the non- Dirt and the like can be improved and sufficient compensation effect can be obtained.

On the other hand, in another embodiment, the compensation range can be selectively limited in consideration of the compensation value in the upper and lower limit gradation range, which will be described with reference to the drawings.

FIG. 7 is a graph of original image data and compensation image data for explaining a compensation method according to the second embodiment of the present invention. The configuration of the display device according to the second embodiment is similar to that of FIG. 7, Is similar to the configuration of the display device according to the first embodiment, so that the description will be made with reference to FIGS. 3 and 4. FIG.

7, original image data (RGB) having gradations between the lowest gradation (Gmin) and the highest gradation (Gmax) is input to the display device 110 from the external system, and the compensation of the display device 110 Unit 170 calculates weighted compensation data wCD having a different compensation range for each gradation region through the compensation method using the image sensing device 160. [

At this time, the weight providing unit 174 receives the compensation data CD from the compensation value calculating unit 172 to determine whether the compensation value of the corresponding gradation is positive or negative, And provides the weight data WD including the set weights to the mixer 176. [

For example, in the lower limit gradation region between the lowest gradation (Gmin) and the lower limit gradation (G1), the weight has a value of 1 regardless of the gradation if the compensation value is a positive number. If the compensation value is negative, (A value between 0 and 1) that is decreasing gradually.

The weight can have a value of 1 which is the same regardless of the gradation in the non-gradation region between the lower limit gradation (G1) and the upper limit gradation (Gh).

In the upper limit gradation region between the upper limit gradation Gh and the upper gradation Gmax, the weight is a value smaller than 1 (a value between 1 and 0) that gradually decreases with increasing gradation if the compensation value is positive If the compensation value is negative, it can have a value of 1 regardless of the gradation.

Here, the compensation range can be expressed by an error bar (EB) between the lowest weight compensation value and the maximum weight compensation value. The range from the center of the error bar (EB) to the lowest weight compensation value at the lower end The interval from the original image data (RGB) in the center of the gap and the error bars (EB) to the maximum weighted compensation value at the top depends on the sign of the gradation area and the compensation value.

Specifically, in the lower limit gradation region between the lowest gradation (Gmin) and the lower limit gradation (G1), when the compensation value is positive, the weight is 1 regardless of the gradation. When the compensation value is negative, The interval between the center of the error bar EB (original image data) and the lowest weight compensation value gradually decreases with the decrease of the gradation, and the center of the error bar EB ) To the maximum weight compensation value is constant irrespective of the gradation, and the compensation range of the weight compensation value, which is the product of the weight and the compensation value, decreases gradually.

In the upper limit gradation region between the lower limit gradation G1 and the upper limit gradation Gh, since the weight is 1 regardless of the gradation, the center of the error bar EB (original image data) To the lowest weight compensation value and the interval between the center of the error bar EB and the maximum weight compensation value are the same and the compensation range of the weight compensation value which is the product of the weight and the compensation value has a constant value.

In the upper limit gradation region between the upper limit gradation Gh and the highest gradation Gmax, if the compensation value is positive, the weight gradually decreases in the range of 1 to 0 as the gradation increases. If the compensation value is negative, The interval between the center of the error bar EB (original image data) and the lowest weight compensation value is constant regardless of the gradation and the center of the error bar EB (original image data) The interval between the maximum weight compensation values becomes smaller and the compensation range of the weight compensation value which is the product of the weight and the compensation value decreases gradually.

Therefore, in the first region C corresponding to the lower limit gradation region and the second region D corresponding to the upper limit gradation region, the compensation which is calculated by adding the weighted compensation data wCD to the original image data RGB, The gradation of the image data (cRGB) is not saturated, thereby preventing or minimizing gradation saturation or gradation accumulation.

The compensated image data cRGB calculated by adding the weighted compensation data wCD to the original image data RGB between the first and second regions C and D corresponding to the non- Dirt and the like can be improved and sufficient compensation effect can be obtained.

In particular, in the second embodiment, although the compensation range (the length of the error bars) in the lower limit gradation region and the upper limit gradation region is reduced, only the length from the center of the error bars to one of the upper end and the lower end is reduced, The reduction range of the compensation range is smaller than in the first embodiment.

Therefore, the compensation effect in the lower limit gradation region and the upper limit gradation region is improved.

Meanwhile, in the third embodiment, the compensation range can be selectively limited in consideration of the compensation value and the compensated image data in the upper and lower gradation gradation regions. In the configuration of the display device according to the third embodiment, The configuration of the display device according to the first embodiment is similar to that of the display device except that the compensation data is received and the original image data is received from the timing controller.

That is, the original image data RGB having the gradation between the lowest gradation Gmin and the highest gradation Gmax is input from the external system to the display device 110, and the compensating unit 170 of the display device 110 performs image sensing The weighted compensation data (wCD) having a different compensation range for each gradation region is calculated through the compensation method using the device 160. [

At this time, the weight providing unit 174 receives the compensation data CD from the compensation value calculating unit 172, receives the original image data RGB from the timing control unit 120, The image data (RGB) is synthesized to calculate the auxiliary compensation image data acRGB (acRGB = RGB + CD).

The weight providing unit 174 determines whether or not the auxiliary compensation video data acRGB is out of the display range between the lowest gradation Gmin and the highest gradation Gmax, And provides the weight data WD to the mixer 176.

For example, in the lower limit gradation region between the lowest gradation (Gmin) and the lower limit gradation (Gl), if the auxiliary compensation image data (acRGB) is smaller than the lowest gradation (Gmin), the weight gradually decreases as the gradation decreases (A value between 0 and 1), and if the auxiliary compensation video data acRGB is greater than or equal to the lowest gradation Gmin, it can have a value of 1 regardless of the gradation.

The weight can have a value of 1 which is the same regardless of the gradation in the non-gradation region between the lower limit gradation (G1) and the upper limit gradation (Gh).

If the auxiliary compensation video data acRGB is smaller than or equal to the maximum gradation Gmax in the upper limit gradation range between the upper limit gradation Gh and the highest gradation Gmax, the weight is set to a value of 1 regardless of the gradation (A value between 1 and 0) which decreases gradually as the gradation increases if the auxiliary compensation video data acRGB is larger than the highest gradation Gmax.

Therefore, in the first region C corresponding to the lower limit gradation region and the second region D corresponding to the upper limit gradation region, the compensation which is calculated by adding the weighted compensation data wCD to the original image data RGB, The gradation of the image data (cRGB) is not saturated, thereby preventing or minimizing gradation saturation or gradation accumulation.

The compensated image data cRGB calculated by adding the weighted compensation data wCD to the original image data RGB between the first and second regions C and D corresponding to the non- Dirt and the like can be improved and sufficient compensation effect can be obtained.

Particularly, in the third embodiment, although the compensation range in the lower limit gradation region and the upper limit gradation region is reduced but the auxiliary compensation image data acRGB by the compensation data CD without applying the weight is smaller than the lowest gradation Gmin ) And the maximum gradation (Gmax), the compensated image data (cRGB) is finally calculated by applying a weight value smaller than 1 selectively to decrease the range of the compensation range in comparison with the first and second embodiments Lt; / RTI >

Therefore, the compensation effect in the lower limit gradation region and the upper limit gradation region is improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

110: display device 120: timing controller
130: Gate driver 140: Data driver
150: display panel 160: imaging device
170:

Claims (10)

A display panel for displaying a test image including gradation;
An imaging device for measuring luminance of the test image and calculating luminance data;
A compensation unit for calculating compensation data including a compensation value corresponding to the gradation using the luminance data, weight data including weight values set differently for each gradation region, and compensation unit for calculating weight compensation data using the compensation data, ;
A timing controller for adding the weighted compensation data to the original image data to calculate compensated image data,
.
The method according to claim 1,
Wherein the compensation unit comprises:
A compensation value calculation unit for calculating the compensation data;
Wherein the gradation region of the original image data is divided into a lower limit gradation region, an unregulated gradation region, and a higher limit gradation region, wherein the lower limit gradation region and the upper limit gradation region have values of 0 to 1, A weight providing unit for providing the weight data including the weight having a value of 1;
And a mixer for multiplying the weight of the weight data by the compensation value of the compensation data to calculate the weighted compensation data including a weight compensation value,
.
3. The method of claim 2,
The weighting value,
In the lower limit gradation region, a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation,
And has a value of 1 in the non-grayed area,
Wherein the upper limit gradation region has a value smaller than 1 which gradually decreases with an increase in the gradation.
3. The method of claim 2,
Wherein the weight providing unit receives the compensation data from the compensation value calculating unit to determine whether the compensation value is positive or negative,
The weighting value,
Wherein in the lower limit gradation region, the compensation value has a value of 1 if the compensation value is a positive number, and has a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation if the compensation value is negative,
And has a value of 1 in the non-grayed area,
Wherein in the upper limit gradation region, if the compensation value is a positive number, it has a value smaller than 1, which gradually decreases with an increase in the gradation, and has a value of 1 when the compensation value is a negative number.
3. The method of claim 2,
The weighting-
The compensation data is received from the compensation value calculation unit,
Receiving the original image data from the timing controller,
Calculating supplementary compensation video data using the compensation data and the original video data,
Determines whether the auxiliary compensation video data is out of the display area between the lowest gradation and the highest gradation,
The weighting value,
In the lower limit gradation region, if the auxiliary compensation image data is smaller than the lowest gradation, it has a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation. If the auxiliary compensation image data is larger than or equal to the lowest gradation, Value,
And has a value of 1 in the non-grayed area,
In the upper limit gradation region, if the auxiliary compensation image data is smaller than or equal to the highest gradation, the auxiliary compensation image data has a value of 1. If the auxiliary compensation image data is larger than the highest gradation, .
Displaying a test image including gradation;
Measuring brightness of the test image to calculate brightness data;
Calculating compensation data including a compensation value corresponding to the gradation using the luminance data;
Calculating weighted compensation data using weighted data including weighted values set differently for each gradation region and the compensation data;
Adding the weighted compensation data to the original image data to calculate compensated image data
Wherein the image compensating method comprises the steps of:
The method according to claim 6,
Wherein the step of calculating the weighted compensation data comprises:
Wherein the gradation region of the original image data is divided into a lower limit gradation region, an unregulated gradation region, and a higher limit gradation region, wherein the lower limit gradation region and the upper limit gradation region have values of 0 to 1, Providing the weight data comprising the weight having a value of one;
Calculating the weighted compensation data including the weighted compensation value by multiplying the weighted value of the weighted data by the compensation value of the compensation data;
Wherein the image compensating method comprises the steps of:
8. The method of claim 7,
The weighting value,
In the lower limit gradation region, a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation,
And has a value of 1 in the non-grayed area,
Wherein the upper limit gradation region has a value smaller than 1 which gradually decreases with an increase in the gradation.
8. The method of claim 7,
Wherein providing the weight data comprises determining whether the compensation value of the compensation data is positive or negative,
The weighting value,
Wherein in the lower limit gradation region, the compensation value has a value of 1 if the compensation value is a positive number, and has a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation if the compensation value is negative,
And has a value of 1 in the non-grayed area,
Wherein in the upper limit gradation region, if the compensation value is a positive number, it has a value smaller than 1, which gradually decreases with an increase in the gradation, and has a value of 1 when the compensation value is a negative number.
8. The method of claim 7,
Wherein the step of providing the weight data comprises:
Calculating auxiliary compensation image data using the compensation data and the original image data;
Determining whether the auxiliary compensation video data is out of the display area between the lowest gradation and the highest gradation
Lt; / RTI >
The weighting value,
In the lower limit gradation region, if the auxiliary compensation image data is smaller than the lowest gradation, it has a value smaller than 1, which gradually decreases in accordance with the decrease of the gradation. If the auxiliary compensation image data is larger than or equal to the lowest gradation, Value,
And has a value of 1 in the non-grayed area,
In the upper limit gradation region, if the auxiliary compensation image data is smaller than or equal to the highest gradation, the auxiliary compensation image data has a value of 1. If the auxiliary compensation image data is larger than the highest gradation, The image compensating method comprising:
KR1020150119013A 2015-08-24 2015-08-24 Display Device Including Compensating Unit And Method Of Compensating Image Using The Same KR20170023615A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190021761A (en) * 2017-08-23 2019-03-06 엘지디스플레이 주식회사 Luminance Compensation System of Display Device and Its Luminance Compensation Method
CN110189727A (en) * 2019-06-27 2019-08-30 昆山国显光电有限公司 A kind of driving method of display panel, driving device and display device
CN113380189A (en) * 2020-02-25 2021-09-10 奇景光电股份有限公司 Time sequence controller
CN117116207A (en) * 2023-04-28 2023-11-24 荣耀终端有限公司 Gray scale compensation method and system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190021761A (en) * 2017-08-23 2019-03-06 엘지디스플레이 주식회사 Luminance Compensation System of Display Device and Its Luminance Compensation Method
US10460639B2 (en) 2017-08-23 2019-10-29 Lg Display Co., Ltd. Luminance compensation system and luminance compensation method thereof
CN110189727A (en) * 2019-06-27 2019-08-30 昆山国显光电有限公司 A kind of driving method of display panel, driving device and display device
CN113380189A (en) * 2020-02-25 2021-09-10 奇景光电股份有限公司 Time sequence controller
CN113380189B (en) * 2020-02-25 2024-03-22 奇景光电股份有限公司 Time sequence controller
CN117116207A (en) * 2023-04-28 2023-11-24 荣耀终端有限公司 Gray scale compensation method and system

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