# US 2014/0152533 A1 · Method for driving information processing device and program and information processing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152533 A1 - Document ID: US20140152533A1 - Status: Published application - Kind: A1 - Application number: 14/090,236 - Filed: 2013-11-26 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Jiro IMADA - Web page: https://patentgrep.com/patent/US20140152533A1 ## CPC - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2330/021: Power management, e.g. power saving - 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 In order to reduce the frequency of rewriting pixels, gray scales of image signals input to a plurality of pixels provided in a display portion are checked before displaying each image. Specifically, in the case where image signals having medium gray scale levels are input to many of the plurality of pixels, display is performed by normal driving (for example, driving in which rewriting pixels is performed at a frequency higher than or equal to 60 times per second); otherwise, display is performed by driving with a small number of frequencies of rewriting pixels (for example, driving in which rewriting pixels is performed at a frequency lower than or equal to once per second). With this method, an information processing device which can reduce users' eye strain and perform eye-friendly display can be provided. ## Claims ### Claim 1 A method for driving an information processing device in which image signals are input to a plurality of pixels, comprising the steps of: obtaining information of a gray scale of an image signal input to at least one of the plurality of pixels, and determining a refresh rate of the plurality of pixels on the basis of the information. ### Claim 2 (depends on 1) The method for driving an information processing device according to claim 1, wherein the plurality of pixels each have a liquid crystal element. ### Claim 3 (depends on 1) The method for driving an information processing device according to claim 1, wherein the information processing device displays a still image. ### Claim 4 A method for driving an information processing device in which image signals are input to first to A-th pixels (A is a natural number greater than or equal to 2), comprising the steps of: counting pixels to which an image signal having a gray scale level within a set range are input in the first to B-th pixels (B is a natural number smaller than A); rewriting the first to A-th pixels at a first refresh rate in the case where the number of the counted pixels is greater than or equal to a set pixel number; and rewriting the first to A-th pixels at a second refresh rate which is lower than a first refresh rate in the case where the sum of the number of the counted pixels and a value (A−B) is smaller than the set pixel number. ### Claim 5 (depends on 4) The method for driving an information processing device according to claim 4, wherein the first refresh rate is higher than or equal to 30 Hz. ### Claim 6 (depends on 4) The method for driving an information processing device according to claim 4, wherein the second refresh rate is lower than or equal to 1 Hz. ### Claim 7 (depends on 4) The method for driving an information processing device according to claim 4, wherein the first to A-th pixels each have a liquid crystal element. ### Claim 8 (depends on 4) The method for driving an information processing device according to claim 4, wherein the information processing device displays a still image. ### Claim 9 A method for driving an information processing device in which image signals are input to a plurality of pixels, comprising the steps of: detecting the proportion of pixels to which image signal having a gray scale level within a set range are input in the plurality of pixels; rewriting the plurality of pixels at a first refresh rate in the case where the detected proportion is greater than or equal to a set proportion; and rewriting the plurality of pixels at a second refresh rate which is lower than a first refresh rate in the case where the detected proportion is smaller than the set proportion. ### Claim 10 (depends on 9) The method for driving an information processing device according to claim 9, wherein the first refresh rate is higher than or equal to 30 Hz. ### Claim 11 (depends on 9) The method for driving an information processing device according to claim 9, wherein the second refresh rate is lower than or equal to 1 Hz. ### Claim 12 (depends on 9) The method for driving an information processing device according to claim 9, wherein the plurality of pixels each have a liquid crystal element. ### Claim 13 (depends on 9) The method for driving an information processing device according to claim 9, wherein the information processing device displays a still image.