# US 10,373,541 B2 · Method and device for controlling display of display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,373,541 B2 - Document ID: US10373541B2 - Status: Granted - Kind: B2 - Application number: 15/353,765 - Filed: 2016-11-17 - Published: 2017-07-06 - Granted: 2019-08-06 - Earliest claimed: 2016-01-05 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Changhoon Lee; Ilnam Kim; Jongin Baek; Wonsang Park - Web page: https://patentgrep.com/patent/US10373541B2 ## CPC - G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)} - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - G09G 2340/0457: Improvement of perceived resolution by subpixel rendering - G09G 2340/06: Colour space transformation - G09G 2360/144: the light being ambient light - 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 display control method and device for controlling a display device. The display device includes a red sub pixel, a green sub pixel, a first blue sub pixel, and a second blue sub pixel emitting light having a different central wavelength from that of the first blue sub pixel. The display control includes setting a display mode of the display device as one of a first mode in which the first blue sub pixel is used to emit blue light, a second mode in which the second blue sub pixel is used, and a third mode in which both the first blue sub pixel and the second blue sub pixel are used; and sub pixel rendering data according to an arrangement of the red sub pixel, the green sub pixel, the first blue sub pixel, and the second blue sub pixel and converting rendered data into output data. ## Claims ### Claim 1 A display control method of controlling a display of a display device, wherein the display device includes a red sub pixel, a green sub pixel, a first blue sub pixel, and a second blue sub pixel emitting light having a different central wavelength from that of the first blue sub pixel, the method comprising: setting a display mode of the display device to emit blue light as one of a first mode in which the first blue sub pixel is used, a second mode in which the second blue sub pixel is used, and a third mode in which both the first blue sub pixel and the second blue sub pixel are used; and sub pixel rendering red input data, green input data, and blue input data according to an arrangement of the red sub pixel, the green sub pixel, the first blue sub pixel, and the second blue sub pixel, and converting the red input data, the green input data, and the blue input data into output data, wherein converting includes performing sub pixel rendering by selecting a size and a coefficient of a rendering filter with respect to each of the red input data, green input data, and blue input data according to the display mode, and wherein a size and a coefficient of a rendering filter for the blue input data are different from a size and a coefficient of a rendering filter for the red input data in the first mode, and the size and the coefficient of the rendering filter for the blue input data are different from the size and the coefficient of the rendering filter for the red input data in the second mode. ### Claim 2 (depends on 1) The display control method as claimed in claim 1, wherein, when the display mode is the first mode, a size and a coefficient of a first rendering filter for converting the red input data into output data of the red sub pixel, and a size and a coefficient of a second rendering filter for converting the blue input data into output data of the first blue sub pixel are different. ### Claim 3 (depends on 2) The display control method as claimed in claim 2, wherein: the first rendering filter is a 2×1 filter and a coefficient of the 2×1 filter is 0.5, and the second rendering filter is a 2×2 filter and a coefficient of the 2×2 filter is 0.25. ### Claim 4 (depends on 1) The display control method as claimed in claim 1, wherein, when the display mode is the second mode, a size and a coefficient of a first rendering filter for converting the red input data into output data of the red sub pixel and a size and a coefficient of a third rendering filter for converting the blue input data into output data of the second blue sub pixel are different. ### Claim 5 (depends on 4) The display control method as claimed in claim 4, wherein: the first rendering filter is a 2×1 filter and a coefficient of the 2×1 filter is 0.5, and the third rendering filter is a 2×2 filter and a coefficient of the 2×2 filter is 0.25. ### Claim 6 (depends on 1) The display control method as claimed in claim 1, wherein, when the display mode is the third mode, a size and a coefficient of a first rendering filter for converting the red input data into output data of the red sub pixel, and a size and a coefficient of a fourth rendering filter for converting the blue input data into output data of the first blue sub pixel and the second blue sub pixel are the same. ### Claim 7 (depends on 6) The display control method as claimed in claim 6, wherein the first rendering filter and the fourth rendering filter are 2×1 filters and a coefficient of the 2×1 filter is 0.5. ### Claim 8 (depends on 1) The display control method as claimed in claim 1, wherein a central wavelength of light emitted from the first blue sub pixel is lower than a central wavelength of light emitted from the second blue sub pixel. ### Claim 9 (depends on 1) The display control method as claimed in claim 1, wherein setting the display mode includes: determining a current state as daytime or night, if the current state is daytime, setting the display mode as the second mode or the third mode, and if the current state is night, setting the display mode as the first mode. ### Claim 10 (depends on 1) The display control method as claimed in claim 1, wherein setting the display mode includes: recognizing a current state as daytime or nighttime night based on at least one of a current time, a preset display mode change cycle, and external luminance; and setting the display mode based on the recognized current state. ### Claim 11 A display control device for controlling a display of a display device, wherein the display device includes a red sub pixel, a green sub pixel, a first blue sub pixel, and a second blue sub pixel emitting light having a different central wavelength from that of the first blue sub pixel, the display control device comprising: a display mode controller to set a display mode of the display device to emit blue light as one of a first mode in which the first blue sub pixel is used, a second mode in which the second blue sub pixel is used, and a third mode in which both the first blue sub pixel and the second blue sub pixel are used; and a data converter to sub pixel render red input data, green input data, and blue input data according to an arrangement of the red sub pixel, the green sub pixel, the first blue sub pixel, and the second blue sub pixel, and to convert the red input data, the green input data, and the blue input data into output data, wherein the sub pixel rendering by the data converter includes selecting a size and a coefficient of a rendering filter with respect to each of the red input data, green input data, and blue input data according to the display mode, and wherein a size and a coefficient of a rendering filter for the blue input data are different from a size and a coefficient of a rendering filter for the red input data in the first mode, and the size and the coefficient of the rendering filter for the blue input data are different from the size and the coefficient of the rendering filter for the red input data in the second mode. ### Claim 12 (depends on 11) The display control device as claimed in claim 11, wherein, when the display mode is the first mode, a size and a coefficient of a first rendering filter for converting the red input data into output data of the red sub pixel, and a size and a coefficient of a second rendering filter for converting the blue input data into output data of the first blue sub pixel are different. ### Claim 13 (depends on 12) The display control device as claimed in claim 12, wherein: the first rendering filter is a 2×1 filter and a coefficient of the 2×1 filter is 0.5, and the second rendering filter is a 2×2 filter and a coefficient of the 2×2 filter is 0.25. ### Claim 14 (depends on 11) The display control device as claimed in claim 11, wherein, when the display mode is the second mode, a size and a coefficient of a first rendering filter for converting the red input data into output data of the red sub pixel and a size, and a coefficient of a third rendering filter for converting the blue input data into output data of the second blue sub pixel are different. ### Claim 15 (depends on 14) The display control device as claimed in claim 14, wherein the first rendering filter is a 2×1 filter and a coefficient of the 2×1 filter is 0.5, and the third rendering filter is a 2×2 filter and a coefficient of the 2×2 filter is 0.25. ### Claim 16 (depends on 11) The display control device as claimed in claim 11, wherein, when the display mode is the third mode, a size and a coefficient of a first rendering filter for converting the red input data into output data of the red sub pixel and a size and a coefficient of a fourth rendering filter for converting the blue input data into output data of the first blue sub pixel and the second blue sub pixel are the same. ### Claim 17 (depends on 16) The display control device as claimed in claim 16, wherein the first rendering filter and the fourth rendering filter are 2×1 filters and a coefficient of the 2×1 filter is 0.5. ### Claim 18 (depends on 11) The display control device as claimed in claim 11, wherein a central wavelength of light emitted from the first blue sub pixel is lower than a central wavelength of light emitted from the second blue sub pixel. ### Claim 19 (depends on 11) The display control device as claimed in claim 11, wherein the display mode controller is to: determine a current state as daytime or nighttime, if the current state is daytime, set the display mode as the second mode or the third mode, and if the current state is nighttime, set the display mode as the first mode. ### Claim 20 (depends on 11) The display control device as claimed in claim 11, wherein the display mode controller is to: recognize a current state as daytime or nighttime based on at least one of a current time, a preset display mode change cycle, and external luminance, and set the display mode based on the recognized current state.