# US 12,190,777 B2 · Method and apparatus for displaying image on image display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,190,777 B2 - Document ID: US12190777B2 - Status: Granted - Kind: B2 - Application number: 18/315,731 - Filed: 2023-05-11 - Published: 2023-09-07 - Granted: 2025-01-07 - Earliest claimed: 2020-11-11 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Teppei Isobe - Web page: https://patentgrep.com/patent/US12190777B2 ## CPC - G09G 3/2051: {with use of a spatial dither pattern} - G09G 3/2055: {the pattern being varied in time} - G09G 3/2077: {by a combination of two or more gradation control methods} - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2320/0613: The adjustment depending on the type of the information to be displayed - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A method for displaying an image on an image displaying device includes the steps of: comparing gray scale level of an image signal for the light emitting element with given threshold level; and when the gray scale level is higher than the threshold level, driving the light emitting element by a driving signal corresponding to the gray scale level, and when the gray scale level is lower than the threshold level, driving the light emitting element by a dithering driving signal including a driving signal corresponding to the threshold level. ## Claims ### Claim 1 A method for displaying an image on an image displaying device, the method comprising: comparing a gray scale level of an image signal for a light-emitting element of the image displaying device with a given threshold level, wherein the given threshold level is based on a type of the image and a total luminance of the image; driving, when the gray scale level is higher than the given threshold level, the light-emitting element by a first driving signal corresponding to the gray scale level; and driving, when the gray scale level is lower than the given threshold level, the light-emitting element by a dithering driving signal including a second driving signal corresponding to the given threshold level. ### Claim 2 (depends on 1) The method of claim 1, wherein the given threshold level is a first threshold level when the type of the image is a still image and is a second threshold level when the type of the image is a moving image, and wherein first threshold level is greater than the second threshold level. ### Claim 3 (depends on 1) The method of claim 1, wherein the type of the image is a still image. ### Claim 4 (depends on 1) The method of claim 1, wherein the type of the image is a moving image. ### Claim 5 (depends on 1) The method of claim 1, wherein the dithering driving signal includes temporal dithering and spatial dithering. ### Claim 6 (depends on 1) The method of claim 1, wherein the dithering driving signal comprises temporal dithering or spatial dithering. ### Claim 7 (depends on 1) The method of claim 1, wherein the light-emitting element is an organic light-emitting diode (OLED). ### Claim 8 An apparatus for displaying an image on an image displaying device, the apparatus comprising: a memory configured to store instructions; and one or more processors coupled to the memory and configured to execute the instructions to cause the apparatus to: determine a given threshold level based on a type of the image and a total luminance of the image; compare a gray scale level of an image signal for a light emitting element of the image displaying device with the given threshold level; select a first driving signal corresponding to the gray scale level when the gray scale level is higher than the given threshold level; or select a dithering driving signal including a second driving signal corresponding to the given threshold level when the gray scale level is lower than the given threshold level; and drive the light emitting element by the first driving signal or the dithering driving signal. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the given threshold level is a first threshold level when the type of the image is a still image and is a second threshold level when the type of the image is a moving image, and wherein first threshold level is greater than the second threshold level. ### Claim 10 (depends on 8) The apparatus of claim 8, wherein the type of the image is a still image. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the type of the image is a moving image. ### Claim 12 (depends on 8) The apparatus of claim 8, wherein the dithering driving signal comprises temporal dithering and spatial dithering. ### Claim 13 (depends on 8) The apparatus of claim 8, wherein the dithering driving signal comprises temporal dithering or spatial dithering. ### Claim 14 (depends on 8) The apparatus of claim 8, wherein the light emitting element is an organic light emitting diode (OLED). ### Claim 15 A computer program product comprising computer-executable instructions for displaying an image on an image displaying device, the computer-executable instructions stored on a non-transitory computer-readable storage medium, wherein the computer-executable instructions when executed by one or more processors of an apparatus, cause the apparatus to: determine a given threshold level based on a type of the image and a total luminance of the image; compare a gray scale level of an image signal for a light emitting element of an image displaying device with the given threshold level; select a first driving signal corresponding to the gray scale level when the gray scale level is higher than the given threshold level; or select a dithering driving signal including a second driving signal corresponding to the given threshold level when the gray scale level is lower than the given threshold level; and drive the light emitting element by the first driving signal or the dithering driving signal. ### Claim 16 (depends on 15) The computer program product of claim 15, wherein the given threshold level is a first threshold level when the type of the image is a still image and is a second threshold level when the type of the image is a moving image, and wherein first threshold level is greater than the second threshold level. ### Claim 17 (depends on 15) The computer program product of claim 15, wherein the type of the image is a moving image. ### Claim 18 (depends on 15) The computer program product of claim 15, wherein the dithering driving signal comprises temporal dithering and spatial dithering. ### Claim 19 (depends on 15) The computer program product of claim 15, wherein the dithering driving signal comprises temporal dithering or spatial dithering. ### Claim 20 (depends on 15) The computer program product of claim 15, wherein the light emitting element is an organic light emitting diode (OLED).