KR20170023614A - 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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KR20170023614A
KR20170023614A KR1020150119012A KR20150119012A KR20170023614A KR 20170023614 A KR20170023614 A KR 20170023614A KR 1020150119012 A KR1020150119012 A KR 1020150119012A KR 20150119012 A KR20150119012 A KR 20150119012A KR 20170023614 A KR20170023614 A KR 20170023614A
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representative
compensation
virtual
compensation values
gradations
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KR1020150119012A
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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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention provides a display device comprising: a display panel for displaying a test image including a plurality of representative gradations; An imaging device for measuring luminance of the test image and calculating luminance data; Calculating a plurality of representative compensation values corresponding to the plurality of representative gradations by using the luminance data, calculating a plurality of representative compensation values corresponding to a plurality of virtual gradations corresponding to the plurality of representative gradations, A compensation unit for calculating compensation data for all gray levels by using the plurality of representative compensation values and the plurality of virtual compensation values; And a timing controller for adding the 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 apparatus, 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 reflected on the original image data, It is possible to prevent or minimize irregularities.

At this time, in order to achieve a more complete compensation, the luminance must be measured for all the gray levels in all the pixels of the display device. However, due to the limitation of the storage capacity of the measured luminance and the capacity of the compensation circuit, It is general to calculate the compensation value by measuring the luminance only for a specific representative gradation, and to calculate the compensation value for the remaining gradations by using interpolation.

In this case, linear interpolation is mainly used to facilitate the implementation of the compensation circuit. If the compensation value calculated by the luminance measurement for a specific representative gradation is abruptly changed, the compensation value calculated by the linear interpolation also changes unnaturally, There is a problem that the image is displayed smoothly and unnaturally.

The compensation method by the linear interpolation method will be described with reference to the drawings.

1 is a compensation graph for explaining a compensation method using an image pickup apparatus by a conventional linear interpolation method.

As shown in Fig. 1, in the compensation method using the image pickup apparatus by the conventional linear interpolation method, the luminance of a specific pixel of the display device is measured for the first to fourth representative gradations RG1 to RG4, The first to fourth representative compensation values RC1 to RC4 are calculated from the luminances of the first to fourth representative gradations RG1 to RG4 and the first to fourth representative gradations RG1 to RG4 are calculated by linear interpolation Thereby calculating the compensation value.

For example, when the first and second representative compensation values RC1 and RC2 are calculated by the luminance measurement in the first and second representative gradations RG1 and RG2, the first and second representative gradations RG1 and RG2, And RG2, the compensation value can be calculated by a line connecting the first and second representative compensation values RC1 and RC2.

Likewise, between the second and third representative gradations RG2 and RG3 and between the third and fourth representative gradations RG3 and RG4, a line segment connecting the second and third representative compensation values RC2 and RC3, 3 and the fourth representative compensation value (RC3, RC4).

The compensation value is added to the original image data to calculate the compensated image data, and by displaying the image using the compensated image data, the luminance unevenness can be compensated.

However, a line connecting the first and second representative compensation values RC1 and RC2 has a negative slope, while a line connecting the second and third representative compensation values RC2 and RC3 has a positive slope .

That is, the values of the first to third representative compensation values RC1 to RC3 in the first to third representative gradations RG1 to RG3 are rapidly changed, but the values of the first to third representative compensation values RC1 to RC3 Since the compensation values between the first to third representative gradations RG1 to RG3 are calculated by the line segments connecting the compensation values RC1 to RC3, a smooth and unnatural picture is generated in the case of an image having a gradation change There is a problem that the display quality of an image is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a display device including a compensation section capable of smoothly and naturally displaying an image by compensating for unevenness of the screen by using the representative compensation value at the representative gray level and the virtual compensation value at the virtual gray level And an image compensation method using the same.

The present invention further provides a display device including a compensator capable of smoothly and naturally displaying an image without increasing the manufacturing cost by calculating a virtual compensation value in a virtual gradation by adding a simple circuit configuration and an image compensation method using the compensator For other purposes.

In order to solve the above problems, the present invention provides a display device comprising: a display panel for displaying a test image including a plurality of representative gradations; An imaging device for measuring luminance of the test image and calculating luminance data; Calculating a plurality of representative compensation values corresponding to the plurality of representative gradations by using the luminance data, calculating a plurality of representative compensation values corresponding to a plurality of virtual gradations corresponding to the plurality of representative gradations, A compensation unit for calculating compensation data for all gray levels by using the plurality of representative compensation values and the plurality of virtual compensation values; And a timing controller for adding the compensation data to the original image data to calculate compensated image data.

The compensation unit may include a representative compensation value calculation unit for calculating the plurality of representative compensation values; A multiplexer for sequentially selecting adjacent three representative compensation values among the plurality of representative compensation values; A virtual compensation value calculation unit for calculating the plurality of virtual compensation values using the adjacent three representative compensation values and weight data; A lookup table storing the weight data; And a linear interpolation unit for calculating a plurality of interpolation compensation values from the plurality of representative compensation values and the plurality of virtual compensation values through linear interpolation and calculating the compensation data.

The plurality of representative gradations may include first to third representative gradations RG1, RG2, and RG3, and the representative reward values include first to third representative reward values RC1, RC2, and RC3. Wherein the plurality of virtual gradations include a first virtual gradation VG1 between the first and second representative gradations RG1 and RG2 and the plurality of virtual compensation values include a first virtual compensation value VC1 And the weight data includes a first weight WD1, and the first virtual compensation value VC1 can be calculated by Equation 1, Equation 2 and Equation 3 below.

(Formula 1) A = (RC1-RC2) / (RG2-RG1)

(Formula 2) B = (RC2-RC3) / (RG3-RG2)

(Equation 3) VC1 = RC1 * (1-WD1) + RC2 * WD1

Here, the first weight WD1 may be 0.5, 0 to 0.5, 0.5 to 1 when (A-B) is 0, a negative number, and a positive number, respectively.

According to another aspect of the present invention, there is provided a method of displaying a test image, comprising: displaying a test image including a plurality of representative gradations; Measuring brightness of the test image to calculate brightness data; Calculating a plurality of representative compensation values corresponding to the plurality of representative gray levels using the luminance data; Calculating a plurality of virtual compensation values corresponding to a plurality of virtual gradations between the plurality of representative gradations using the plurality of representative compensation values; Calculating compensation data for all gray levels using the plurality of representative compensation values and the plurality of virtual compensation values; And adding the compensation data to the original image data to calculate compensated image data.

The calculating of the plurality of virtual compensation values may include sequentially selecting adjacent three representative compensation values among the plurality of representative compensation values; And calculating the plurality of virtual compensation values using the adjacent three representative compensation values and the weight data.

The calculating of the compensation data may include calculating a plurality of interpolation compensation values from the plurality of representative compensation values and the plurality of virtual compensation values through a linear interpolation method; And calculating the compensation data from the plurality of representative compensation values, the plurality of virtual compensation values, and the plurality of interpolation compensation values.

The plurality of representative gradations includes first to third representative gradations RG1, RG2, and RG3, and the representative reward values include first to third representative reward values RC1, RC2, and RC3. Wherein the plurality of virtual gradations include a first virtual gradation VG1 between the first and second representative gradations RG1 and RG2 and the plurality of virtual compensation values include a first virtual compensation value VC1 And the weight data includes a first weight WD1, and the first virtual compensation value VC1 can be calculated by Equation 1, Equation 2 and Equation 3 below.

(Formula 1) A = (RC1-RC2) / (RG2-RG1)

(Formula 2) B = (RC2-RC3) / (RG3-RG2)

(Equation 3) VC1 = RC1 * (1-WD1) + RC2 * WD1

INDUSTRIAL APPLICABILITY The present invention has an effect of smoothly and naturally displaying an image by compensating for screen unevenness by using the representative compensation value in the representative gray level and the virtual compensation value in the virtual gray level.

Further, the present invention has the effect of displaying the image smoothly and naturally without increasing the manufacturing cost by calculating a virtual compensation value in virtual gradation by adding a simple circuit configuration.

FIG. 1 is a compensation graph for explaining a compensation method using an image pickup apparatus by a conventional linear interpolation method.
2 shows a display device according to an embodiment of the present invention.
3 is a view illustrating a timing control unit and a compensation unit of a display device according to an embodiment of the present invention.
4 is a compensation graph for explaining a compensation method according to an embodiment of the present invention.
5A and 5B are exemplary compensation graphs for explaining the compensation method according to the embodiment of the present invention, respectively.

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.

2 is a view showing a display device according to an embodiment of the present invention.

2, a display device 110 according to an embodiment of the present invention includes a timing controller 120, a gate driver 130, a data driver 140, a display panel 150, an image sensing device 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 , And the test image data may include a plurality of representative gradations (RG1 to RG4 in FIG. 4).

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 luminance values based on a plurality of representative gradations.

The compensation unit 170 calculates compensation data CD for all the gradation levels using the luminance data LD received from the image sensing apparatus 160 and outputs the calculated compensation data CD to the timing control unit 120 The compensation data CD corresponds to a plurality of representative compensation values (RC1 to RC4 in FIG. 4) corresponding to a plurality of representative gradations RG1 to RG4 and a plurality of virtual gradations (VG1 to VG4 in FIG. 4) (VC1 to VC3 in FIG. 4) and a plurality of interpolation compensation values corresponding to gradations between a plurality of representative gradations RG1 to RG4 and a plurality of virtual gradations VG1 to VG4.

Here, the compensating unit 170 includes not only a plurality of representative compensation values RC1 to RC4 calculated from the measured luminance values, but also a plurality of virtual compensation values VC1 to VC4 calculated from the variation amounts of the plurality of representative compensation values RC1 to RC4, VC3 are used to calculate a plurality of interpolation compensation values, so that the final compensation data CD for all the gradations is prevented or minimized suddenly, which will be described in detail later.

The timing control unit 120 adds the compensation data CD received from the compensation unit 170 to the original image data (RGB in Fig. 3) to calculate the compensated image data (cRGB in Fig. 3) And transfers the 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 a screen unevenness such as an unevenness or a color abnormality.

2, 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. 3 is a view showing a timing control unit and a compensating unit of a display device according to an embodiment of the present invention, and will be described with reference to FIG. 2. FIG.

3, the compensation unit 170 of the display device 110 according to the embodiment of the present invention includes a representative compensation value calculation unit 172, a multiplexer (MUX) 174, A lookup table (LUT) 178 and a linear interpolator 180, and the timing controller 120 includes an adder 122. The lookup table (LUT)

The representative compensation value calculation unit 172 calculates a plurality of representative compensation values RC1 to RCn corresponding to the plurality of representative gradations RG1 to RGn using the luminance data LD received from the image pickup unit 160 do.

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

The mux 174 successively selects some of the representative representative compensation values RC1 to RCn and delivers them to the virtual compensation value calculation unit 176 and the linear interpolation unit 180, respectively.

For example, the MUX 174 successively selects three consecutive (adjacent) out of the representative representative compensation values RC1 to RCn, and supplies the virtual compensation value calculation unit 176 and the linear interpolation unit 180 to the virtual compensation value calculation unit 176 and the linear interpolation unit 180, respectively After the first to third representative compensation values RC1 to RC3 are selected and the first virtual compensation value VC1 is calculated by the virtual compensation value calculation unit 176, The compensation values RC2 to RC4 can be selected.

Then, the mux 174 can sequentially select the first to (n-2) th to (n-2) th to (n-2) th to (n-2) th to (n-2) th to RCn.

The virtual compensation value calculator 176 calculates a virtual compensation value using a plurality of representative compensation values RC1 to RCn selected by the MUX 174 and weight data WD of the lookup table 178, VC1 to VC (n-1)), and transfers the calculated plurality of virtual compensation values VC1 to VC (n-1) to the linear interpolator 180. [

For example, the virtual compensation value calculator 176 calculates the weighted value WD corresponding to the first to third representative compensation values RC1 to RC3 and the first to third representative compensation values RC1 to RC3 It is possible to calculate the first virtual compensation value VC1 corresponding to the first virtual gradation VG1 between the first and second representative gradations RG1 and RG2.

As described above, the virtual compensation value calculator 176 sequentially calculates the virtual compensation value using some of the representative compensation values RC1 to RCn selected by the MUX 174, (N-2) th to (n-2) th to (n-2) th to the nth representative compensation values RC (N-2) virtual gradations VG (n-2) between the (n-2) and (n-1) representative gradations RG (n-2) and RG 2) virtual compensation value VC (n-2) corresponding to the (n-2) virtual compensation value VC (n-2).

Here, the virtual compensation value calculator 176 calculates the virtual compensation value VC (n-1) corresponding to the last (n-1) virtual gradation VG (n-1) (N-1) and the nth representative compensation values RC (n-1) and RCn and the compensation value of the highest gray level, assuming that the compensation value at the highest gray level is 0 can do.

The virtual compensation value calculated by the virtual compensation value calculation unit 176 may be a value between adjacent two representative compensation values (including a representative compensation value as a boundary point).

The lookup table 178 stores weight data WD corresponding to a part of a plurality of representative compensation values RC1 to RCn and transfers corresponding weight data WD to the virtual compensation value calculator 176 .

The weight data WD may be a value corresponding to three consecutive (adjacent) ones of the plurality of representative compensation values RC1 to RCn. Can be determined.

For example, a value obtained by subtracting the reciprocal of the slope of the line segment connecting the second and third representative compensation values RC2 and RC3 from the reciprocal of the slope of the line segment connecting the first and second representative compensation values RC1 and RC2 The weight data WD corresponding to the first to third representative compensation values RC1 to RC3 may be 0.5, 0 to 0.5 and 0.5 to 1, respectively.

The linear interpolator 180 multiplies the plurality of representative compensation values RC1 to RCn received from the mux 174 and the plurality of virtual compensation values VC1 to VC (n-1) received from the virtual compensation value calculator 176 (N-1)) and a plurality of interpolation compensation values by calculating a plurality of interpolation compensation values from the plurality of representative compensation values RC1 to RCn and the plurality of virtual compensation values VC1 to VC And transmits the calculated compensation data CD to the timing control unit 120. The timing control unit 120 determines the timing of the compensation data CD based on the compensation data CD.

That is, the linear interpolator 180 calculates the compensation value by a line segment connecting the adjacent representative compensation value and the virtual tone value. For example, the linear interpolator 180 calculates the compensation value between the first representative gradation RG1 and the first virtual gradation VG1 The compensation value can be calculated by a line connecting the first representative compensation value RC1 and the first virtual compensation value VC1.

The adder 122 of the timing controller 120 synthesizes the original image data RGB and the compensation data CD received from the linear interpolator 180 of the compensator 170 to obtain the compensated image data cRGB, And transmits the calculated data 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 a screen unevenness such as an unevenness or a color abnormality.

A method of calculating the virtual gradation and the virtual compensation value of the compensation unit 170 will be described with reference to the drawings.

FIG. 4 is a compensation graph for explaining a compensation method according to an embodiment of the present invention, and will be described with reference to FIGS. 2 and 3. FIG.

4, in the compensation method according to the embodiment of the present invention, the luminance value of a specific pixel P of the display device 110 is measured for the first to fourth representative gradations RG1 to RG4 , And calculates the first to fourth representative compensation values RC1 to RC4 from the measured luminance values of the first to fourth representative gradations RG1 to RG4.

In the first to third virtual gradations VG1 to VG3 between the first to fourth representative gradations RG1 to RG4, the first to fourth representative compensation values RC1 to RC4 and the weight data WD The first to third virtual compensation values VC1 to VC3 are calculated.

For example, the first virtual compensation value VC1 corresponding to the first virtual gradation VG1 between the first and second representative gradations RG1 and RG2 is the first to third representative gradations RG1 to RG3, And the first to third representative compensation values RC1 to RC3 and the first weight WD1 according to the following expressions 1 to 3. [

(Formula 1) A = (RC1-RC2) / (RG2-RG1)

(Formula 2) B = (RC2-RC3) / (RG3-RG2)

(Equation 3) VC1 = RC1 * (1-WD1) + RC2 * WD1

Here, A is a value corresponding to the reciprocal of the slope of the line segment connecting the first and second representative compensation values RC1 and RC2, and B is a line segment connecting the second and third representative compensation values RC2 and RC3 Is a value corresponding to the reciprocal of the slope of the slope.

The first weight WD1 is determined to be 0.5, 0 to 0.5, and 0.5 to 1, respectively, when the first weight WD1 is a value dependent on (AB), the first weight WD1 is 0.5, Lt; / RTI >

For example, as AB is negative and the absolute value is larger, the first weight WD1 may be close to zero, and as the AB is positive and the absolute value is larger, the first weight WD1 is 1 As shown in FIG.

Likewise, the second virtual compensation value VC2 corresponding to the second virtual gradation VG2 between the second and third representative gradations RG2 and RG3 is the second virtual compensation value VC2 corresponding to the second to fourth representative gradations RG2 to RG4, 3 corresponding to the third virtual gradation VG3 between the third and fourth representative gradations RG2 and RG3, which can be calculated from the second to fourth representative compensation values RC2 to RC4 and the second weight WD2, The virtual compensation value VC3 can be calculated from the third to fifth representative gradations (RG2 to not shown), the third to fifth representative compensation values (RC2 to not shown), and the third weight WD3.

4, the same method is applied to a plurality of representative gradations RG1 to RGn and a plurality of representative compensation values RC1 to RCn to generate a plurality of virtual gradations VG1 to RGn, VG (n-1) and a plurality of virtual compensation values VC1 to VC (n-1).

That is, in the compensation method according to the embodiment of the present invention, the virtual compensation value corresponding to the virtual gradation between the three representative gradations is set in accordance with the change of the slope between the representative compensation values corresponding to the three representative gradations, The second compensation graph CC2 calculated by applying the linear interpolation to the representative compensation value and the virtual compensation value rather than the first compensation curve CC1 calculated by applying the linear interpolation to the compensation value shows a smooth and gradual change, It is possible to prevent sudden fluctuation of the resultant compensation value, thereby preventing or minimizing the screen irregularity of the display device 110. [

Since a plurality of representative gradations can arbitrarily select the number and positions of all the gradations, the calculation of a plurality of virtual compensation values can be simplified by setting the difference between a plurality of representative gradations to an index of two.

For example, the calculation speeds of A and B can be improved by setting (RG2-RG1) and (RG3-RG2) in Equations 1 and 2 to 2 5 (= 32), respectively.

This compensation method will be described in more detail with a specific example.

FIGS. 5A and 5B are exemplary compensation graphs for explaining the compensation method according to the embodiment of the present invention, respectively, and will be described with reference to FIGS. 2 to 4. FIG.

5A, the first to third representative gradations RG1 to RG3 are G31, G159 and G223, respectively, and the first to third representative gradations RG1 to RG3 in the first to third representative gradations RG1 to RG3, When the values RC1 to RC3 are 64, 0, and 64, respectively, the first virtual gradation VG1, which is an intermediate value between the first and second representative gradations RG1 and RG2, becomes G63.

At this time, the first virtual compensation value VC1 in the first virtual gradation VG1 becomes 12.8 according to the equations (1) to (3).

(Equation 1) A = (RC1-RC2) / (RG2-RG1) = (64-0) / (95-31) = 64/64 = 1

(Formula 2) B = (RC2-RC3) / (RG3-RG2) = (0-64) / (159-95) = -64/64 = -1

VC1 = RC1 * (1-WD1) + RC2 * WD1 = 64 * (1-0.8) + 0 * (0.8) = 12.8

Here, since (A-B) is 2, the case where the first weight WD1 is set to 0.8 out of 0.5 to 1 is taken as an example.

 Since the first virtual compensation value VC1 is 12.8 and the first and second representative compensation values RC1 and RC2 are 64 and 0 respectively, the first virtual compensation value VC1 is equal to the first and second representative compensation values RC1, and RC2).

In this case, since the compensation value is rapidly changed based on the second representative compensation value RC2, the first virtual compensation value VC1 is added to the first to third representative compensation values RC1 to RC3 to be applied to the linear interpolation method This makes it possible to make the compensation graph exhibit a softer and gradual change.

5B, the first to third representative gradations RG1 to RG3 are G31, G159 and G223, respectively, and the first to third representative gradations RG1 to RG3 correspond to the first to third gradation levels RG1 to RG3. When the representative compensation values RC1 to RC3 are 32, 0, and -32, respectively, the first virtual gradation VG1, which is an intermediate value between the first and second representative gradations RG1 and RG2, becomes G63.

At this time, the first virtual compensation value VC1 in the first virtual gradation VG1 becomes 16 according to the equations (1) to (3).

(Equation 1) A = (RC1-RC2) / (RG2-RG1) = (32-0) / (95-31) = 32/64 = 1/2

(Formula 2) B = (RC2-RC3) / (RG3-RG2) = (0 + 32) / (159-95) = 32/64 = 1/2

VC1 = RC1 * (1-WD1) + RC2 * WD1 = 32 * (1-0.5) + 0 * (0.5) = 16

Here, since (A-B) is 0, the case where the first weight WD1 is set to 0.5 is taken as an example.

 Since the first virtual compensation value VC1 is 16 and the first and second representative compensation values RC1 and RC2 are 32 and 0 respectively, the first virtual compensation value VC1 is equal to the first and second representative compensation values RC1, RC2).

In this case, since the compensation value does not change abruptly on the basis of the second representative compensation value RC2, the first virtual compensation value VC1 is added to the first to third representative compensation values RC1 to RC3, The compensation graph calculated by applying the first to third representative compensation values RC1 to RC3 has the same shape as the compensation graph calculated by applying the first to third representative compensation values RC1 to RC3 to the linear interpolation method.

As described above, in the display device including the compensator according to the embodiment of the present invention and the image compensating method using the compensator, the virtual three virtuals between the representative tonalities in accordance with the change in the slope between the representative compensation values corresponding to the three representative gray- The compensation value corresponding to the gradation is calculated and the compensating graph is finally calculated by applying the linear interpolation to the representative compensation value and the virtual compensation value to prevent the compensation value from being abruptly changed to prevent the screen image from being unevenly displayed on the display device 110 Or minimized.

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 (8)

A display panel for displaying a test image including a plurality of representative gradations;
An imaging device for measuring luminance of the test image and calculating luminance data;
Calculating a plurality of representative compensation values corresponding to the plurality of representative gradations by using the luminance data, calculating a plurality of representative compensation values corresponding to a plurality of virtual gradations corresponding to the plurality of representative gradations, A compensation unit for calculating compensation data for all gray levels by using the plurality of representative compensation values and the plurality of virtual compensation values;
A timing controller for adding the compensation data to the original image data to calculate compensation image data,
.
The method according to claim 1,
Wherein the compensation unit comprises:
A representative compensation value calculation unit for calculating the plurality of representative compensation values;
A multiplexer for sequentially selecting adjacent three representative compensation values among the plurality of representative compensation values;
A virtual compensation value calculation unit for calculating the plurality of virtual compensation values using the adjacent three representative compensation values and weight data;
A lookup table storing the weight data;
Calculating a plurality of interpolation compensation values from the plurality of representative compensation values and the plurality of virtual compensation values through a linear interpolation method,
.
The method according to claim 1,
The plurality of representative gradations include first to third representative gradations RG1, RG2, and RG3,
The plurality of representative compensation values include first through third representative compensation values RC1, RC2, and RC3,
Wherein the plurality of virtual gradations include a first virtual gradation (VG1) between the first and second representative gradations (RG1, RG2)
Wherein the plurality of virtual compensation values comprise a first virtual compensation value (VC1)
The weight data includes a first weight WD1,
The first virtual compensation value (VC1) is calculated by the following equations (1), (2) and (3).
(Formula 1) A = (RC1-RC2) / (RG2-RG1)
(Formula 2) B = (RC2-RC3) / (RG3-RG2)
(Equation 3) VC1 = RC1 * (1-WD1) + RC2 * WD1
The method of claim 3,
Wherein the first weights WD1 are 0.5, 0 to 0.5, and 0.5 to 1, respectively, when Expression (1), Expression (2)
Displaying a test image including a plurality of representative gradations;
Measuring brightness of the test image to calculate brightness data;
Calculating a plurality of representative compensation values corresponding to the plurality of representative gray levels using the luminance data;
Calculating a plurality of virtual compensation values corresponding to a plurality of virtual gradations between the plurality of representative gradations using the plurality of representative compensation values;
Calculating compensation data for all gray levels using the plurality of representative compensation values and the plurality of virtual compensation values;
Adding the compensation data to the original image data to calculate compensated image data
Wherein the image compensating method comprises the steps of:
6. The method of claim 5,
Wherein the calculating of the plurality of virtual compensation values comprises:
Sequentially selecting three adjacent representative compensation values among the plurality of representative compensation values;
Calculating the plurality of virtual compensation values using the adjacent three representative compensation values and weight data,
Wherein the image compensating method comprises the steps of:
6. The method of claim 5,
Wherein the step of calculating the compensation data comprises:
Calculating a plurality of interpolation compensation values by linear interpolation from the plurality of representative compensation values and the plurality of virtual compensation values;
Calculating the compensation data from the plurality of representative compensation values, the plurality of virtual compensation values, and the plurality of interpolation compensation values,
Wherein the image compensating method comprises the steps of:
6. The method of claim 5,
The plurality of representative gradations include first to third representative gradations RG1, RG2, and RG3,
The plurality of representative compensation values include first through third representative compensation values RC1, RC2, and RC3,
Wherein the plurality of virtual gradations include a first virtual gradation (VG1) between the first and second representative gradations (RG1, RG2)
Wherein the plurality of virtual compensation values comprise a first virtual compensation value (VC1)
The weight data includes a first weight WD1,
Wherein the first virtual compensation value (VC1) is calculated by the following equations (1), (2) and (3).
(Formula 1) A = (RC1-RC2) / (RG2-RG1)
(Formula 2) B = (RC2-RC3) / (RG3-RG2)
(Equation 3) VC1 = RC1 * (1-WD1) + RC2 * WD1
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WO2020004704A1 (en) * 2018-06-28 2020-01-02 주식회사 사피엔반도체 Display device and method for controlling brightness of same
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US11270618B2 (en) 2020-08-06 2022-03-08 Samsung Display Co., Ltd. Apparatus for testing display device and display device for performing mura compensation and mura compensation method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020004704A1 (en) * 2018-06-28 2020-01-02 주식회사 사피엔반도체 Display device and method for controlling brightness of same
US11270665B2 (en) 2018-06-28 2022-03-08 Sapien Semiconductors Inc. Display device and method for controlling brightness of same
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
US11270618B2 (en) 2020-08-06 2022-03-08 Samsung Display Co., Ltd. Apparatus for testing display device and display device for performing mura compensation and mura compensation method
US20230139387A1 (en) * 2021-11-04 2023-05-04 Lx Semicon Co., Ltd. Ir drop compensation apparatus and method for display panel and display driving apparatus
US12073785B2 (en) * 2021-11-04 2024-08-27 Lx Semicon Co., Ltd. IR drop compensation apparatus and method for display panel and display driving apparatus
WO2024119347A1 (en) * 2022-12-06 2024-06-13 京东方科技集团股份有限公司 Display apparatus, display method, computer device, storage medium and electronic product
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