Granted Patent B2

US 12,462,738 · App. 18/810,111 · Granted Nov 4, 2025

Inventors: Do Won Kim (Yongin-si, KR); Min Weun Kim (Yongin-si, KR)

Assignee: SAMSUNG DISPLAY CO., LTD.

G09G3/32G09G2320/0233G09G2320/0271G09G2330/028G09G2360/16

Abstract

Claims (69)

1 . A display device comprising:

a display panel comprising a pixel;

a gamma voltage generator configured to generate gamma voltages; and

a driver configured to:

convert a grayscale value of image data into a voltage value, using a gamma lookup table corresponding to an input luminance value, wherein:

the gamma lookup table comprises voltage values for a set of grayscale values among all grayscale values, and

in association with converting the grayscale value into the voltage value, the driver is configured to calculate voltage values for all the grayscale values by nonlinearly interpolating the voltage values for the set of grayscale values, and

provide the display panel with a data voltage corresponding to a gamma voltage among the gamma voltages, wherein the data voltage corresponds to the voltage value,

wherein the driver is further configured to:

select a first gamma lookup table and a second gamma lookup table from among predetermined gamma lookup tables corresponding to representative luminance values, based on the input luminance value;

calculate a third gamma lookup table for the input luminance value by linearly interpolating the first gamma lookup table and the second gamma lookup table; and

generate the gamma lookup table based on the third gamma lookup table, wherein generating the gamma lookup table comprises applying or refraining from applying an offset corresponding to the input luminance value to the third gamma lookup table.

2 . The display device of claim 1 , wherein a range of the input luminance value is divided into a plurality of luminance sections with respect to the representative luminance values,

wherein offsets for first intermediate luminance values comprised in a first luminance section among the plurality of luminance sections are predetermined, and

wherein the driver calculates the offset by applying the offsets to a second luminance section comprised among the plurality of luminance sections and to which the input luminance value belongs.

3 . The display device of claim 2 , wherein the offsets for the first intermediate luminance values have a nonlinear relationship with respect to the first intermediate luminance values, and

wherein the offsets for the first intermediate luminance values are located on a multidimensional nonlinear curve.

4 . The display device of claim 3 , wherein, for an intermediate luminance value among the first intermediate luminance values comprised in the first luminance section, a size of an offset for the intermediate luminance value increases as a distance between the intermediate luminance value and a boundary of the first luminance section increases.

5 . The display device of claim 3 , wherein the driver is configured to:

sample the multidimensional nonlinear curve such that a first quantity of the first intermediate luminance values in the first luminance section corresponds to a second quantity of second intermediate luminance values in the second luminance section to which the input luminance value belongs; and

acquire the offset corresponding to the input luminance value from a sampling result associated with sampling the multidimensional nonlinear curve.

6 . The display device of claim 3 , wherein a gain is predetermined for each luminance section of the plurality of luminance sections, and

wherein the driver is configured to:

correct a height of the multidimensional nonlinear curve, using the gain of the second luminance section to which the input luminance value belongs; and

acquire the offset corresponding to the input luminance value by sampling the corrected multidimensional nonlinear curve.

7 . The display device of claim 6 , wherein the gain further comprises a sub-gain for each grayscale, and

wherein the driver generates the gamma lookup table by applying a sub-offset for each grayscale to a corresponding voltage value in the third gamma lookup table, using the sub-gain.

8 . The display device of claim 2 , further comprising:

an emission driver configured to adjust an emission time parameter of the pixel in a frame, based on whether the input luminance value is in a partial luminance section among the plurality of luminance sections,

wherein the driver is configured to:

convert the grayscale value into the voltage value, using the gamma lookup table, when the input luminance value is in the partial luminance section, and

convert the grayscale value into the voltage value, using the third gamma lookup table, when the input luminance value is out of the partial luminance section.

9 . The display device of claim 2 , wherein the driver is configured to acquire the offset corresponding to the input luminance value, using offsets of the first luminance section among the plurality of luminance sections.

10 . The display device of claim 1 , wherein the driver is configured to generate the gamma lookup table by adding the offset to a voltage value comprised in the third gamma lookup table.

11 . A method of driving a display device, the method comprising:

selecting a first gamma lookup table and a second gamma lookup table from among predetermined gamma lookup tables corresponding to representative luminance values as some of all luminance values, based on an input luminance value of a display panel;

calculating a third gamma lookup table for the input luminance value by linearly interpolating the first gamma lookup table and the second gamma lookup table;

generating a fourth gamma lookup table based on the third gamma lookup table, wherein generating the fourth gamma lookup table comprises applying or refraining from applying an offset corresponding to the input luminance value to the third gamma lookup table;

converting a grayscale value of image data into a voltage value, using the fourth gamma lookup table, wherein the converting of the grayscale value into the voltage value comprises converting the grayscale value into the voltage value, using the fourth gamma lookup table, in response to the input luminance value being smaller than a reference luminance value; and

providing the display panel with a data voltage corresponding to a gamma voltage among gamma voltages generated by a gamma voltage generator, wherein the data voltage corresponds to the voltage value.

12 . The method of claim 11 , wherein a range of the input luminance value is divided into a plurality of luminance sections with respect to the representative luminance values,

wherein offsets for first intermediate luminance values comprised in a first luminance section among the plurality of luminance sections are predetermined, and

wherein the generating of the fourth gamma lookup table comprises calculating the offset by applying the offsets to a second luminance section comprised among the plurality of luminance sections and to which the input luminance value belongs.

13 . The method of claim 12 , wherein the offsets for the first intermediate luminance values have a nonlinear relationship with respect to the first intermediate luminance values, and

wherein the offsets for the first intermediate luminance values are located on a multidimensional nonlinear curve.

14 . The method of claim 13 , wherein the calculating of the offset further comprises:

sampling the multidimensional nonlinear curve such that a first quantity of the first intermediate luminance values in the first luminance section corresponds to a second quantity of second intermediate luminance values in the second luminance section to which the input luminance value belongs; and

acquiring the offset corresponding to the input luminance value from a sampling result associated with the sampling of the multidimensional nonlinear curve.

15 . The method of claim 14 , wherein the generating of the fourth gamma lookup table comprises adding the offset to a voltage value comprised in the third gamma lookup table.

16 . The method of claim 14 , wherein the fourth gamma lookup table comprises voltage values for a set of grayscale values among all grayscale values, and

wherein the converting of the grayscale value into the voltage value comprises calculating voltage values for all the grayscale values by nonlinearly interpolating the voltage values for the set of grayscale values.

17 . The method of claim 13 , wherein a gain is predetermined for each luminance section of the plurality of luminance sections,

wherein the calculating of the offset further comprises sampling the multidimensional nonlinear curve, wherein the sampling of the multidimensional nonlinear curve comprises correcting a height of the multidimensional nonlinear curve, using the gain of the second luminance section to which the input luminance value belongs, and

wherein the method further comprises acquiring the offset corresponding to the input luminance value by sampling the corrected multidimensional nonlinear curve.

18 . The method of claim 17 , wherein the gain further comprises a sub-gain for each grayscale, and

wherein the generating of the fourth gamma lookup table further comprises applying a sub-offset for each grayscale to a corresponding voltage value in the third gamma lookup table, using the sub-gain.

19 . A display device comprising:

a display panel comprising a pixel;

a gamma voltage generator configured to generate gamma voltages; and

a driver configured to:

convert a grayscale value of image data into a voltage value, using a gamma lookup table corresponding to an input luminance value, and

provide the display panel with a data voltage corresponding to a gamma voltage among the gamma voltages, wherein the data voltage corresponds to the voltage value,

wherein the driver is further configured to:

select a first gamma lookup table and a second gamma lookup table from among predetermined gamma lookup tables corresponding to representative luminance values, based on the input luminance value, wherein:

a range of the input luminance value is divided into a plurality of luminance sections with respect to the representative luminance values; and

offsets for first intermediate luminance values comprised in a first luminance section among the plurality of luminance sections are predetermined, have a nonlinear relationship with respect to the first intermediate luminance values, and are located on a multidimensional nonlinear curve;

calculate a third gamma lookup table for the input luminance value by linearly interpolating the first gamma lookup table and the second gamma lookup table;

calculate an offset corresponding to the input luminance value by applying the offsets to a second luminance section comprised among the plurality of luminance sections and to which the input luminance value belongs; and

generate the gamma lookup table based on the third gamma lookup table, wherein generating the gamma lookup table comprises applying or refraining from applying the offset corresponding to the input luminance value to the third gamma lookup table.

Assignments (1)

Continuity (1)

References Cited (10)