# US 9,437,127 B2 · Device and method for displaying image, device and method for supplying power, and method for adjusting brightness of contents > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,127 B2 - Document ID: US9437127B2 - Status: Granted - Kind: B2 - Application number: 13/719,597 - Filed: 2012-12-19 - Published: 2013-07-04 - Granted: 2016-09-06 - Earliest claimed: 2011-12-28 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Jae-sung Park; Hyung-rae Kim; Myoung-jun Lee; Sang-hoon Lee; Byeong-cheol Hyeon - Web page: https://patentgrep.com/patent/US9437127B2 ## CPC - G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)} - G09G 3/003: {to produce spatial visual effects} - G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)} - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2320/0252: Improving the response speed - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - G09G 2320/041: Temperature compensation - G09G 2320/0626: for control of overall brightness - G09G 2330/021: Power management, e.g. power saving - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame - 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 device and a method for displaying an image, a device and a method for supplying power, and a method for adjusting brightness of contents are provided. The device for displaying the image includes: a pixel value converter which, if a plurality of color pixel values of the image is received, converts the received color pixel values; a display panel which includes a plurality of color light-emitting devices and which drives each of the plurality of color light-emitting devices based on the converted color pixel values; a light-emission controller which provides the display panel with a control signal which variably controls respective driving times of each of the color light-emitting devices based on colors; and a global controller which controls the light-emission controller to variably adjust a duty ratio of the control signal based on colors and the converted color pixel values. ## Claims ### Claim 1 A device for displaying an image, the device comprising: a pixel value converter which receives a plurality of color pixel values of the image and converts the plurality of the received color pixel values; a display panel which comprises a plurality of color light-emitting devices and drives the plurality of color light-emitting devices according to the plurality of the converted color pixel values; a light-emission controller which provides the display panel with a control signal which variably controls driving times of the plurality of color light-emitting devices according to colors of the plurality of color light-emitting devices; and a controller which controls the light-emission controller to variably adjust a duty ratio of said control signal according to colors of the plurality of color light-emitting devices based on the plurality of the converted color pixel values, wherein the controller controls the light-emission controller to control first color light-emitting devices by a first duty ratio and to control second color light-emitting devices by a second duty ratio. ### Claim 2 (depends on 1) The device of claim 1, wherein: the plurality of color light-emitting devices comprise red (R), green (G), and blue (B) light-emitting devices; and the plurality of color pixel values comprise R, G, and B pixel values. ### Claim 3 (depends on 1) The device of claim 1, wherein the pixel value converter stores the converted color pixel values in conjunction with the corresponding received color pixel values in a lookup table (LUT) form. ### Claim 4 (depends on 1) The device of claim 1, wherein the controller comprises: a conversion value calculator which calculates differences between the received color pixel values and the corresponding converted color pixel values. ### Claim 5 (depends on 1) The device of claim 1, wherein the light-emission controller adjusts the duty ratio of said control signal so that the color light-emitting devices have a long turn-on time in correspondence with an order of a driving voltage of the color light-emitting devices. ### Claim 6 (depends on 5) The device of claim 5, wherein if the color light-emitting devices are R, G, and B color light-emitting devices, the light-emission controller generates said control signal so that the turn-on times satisfy an equation expressible as: ix_org×Dx_org=ix_calc×Dx_calc wherein ix_org denotes a current value corresponding to a received pixel value, Dx_org denotes a turn-on time corresponding to the received pixel value, ix_calc denotes a current value calculated by the controller, Dx_calc denotes a turn-on time calculated by the controller, and x can be equal to each of R, G, and B. ### Claim 7 (depends on 1) The device of claim 1, wherein the color light-emitting devices are driven by a same power supply voltage. ### Claim 8 (depends on 1) The device of claim 1, wherein the display panel further comprises: a first switching element which is supplied with a power supply voltage to generate a current by using the converted color pixel values; and a second switching element which adjusts an amount of the current according to said control signal having the adjusted duty ratio and supplies the adjusted current to the color light-emitting devices. ### Claim 9 (depends on 1) The device of claim 1, wherein conversion degrees of the converted color pixel values are determined according to degrees of lowering and setting a voltage of a switching element connected between the power supply voltage and the color light-emitting devices. ### Claim 10 A method for displaying an image, the method comprising: receiving a plurality of color pixel values of an image, converting the plurality of the received color pixel values and outputting the plurality of the converted color pixel values; driving a plurality of color light-emitting devices according to the plurality of the converted color pixel values, by a display panel; providing, by a light-emission controller, to the display panel, a control signal which controls driving times of the plurality of the color light-emitting devices; and controlling the light-emission controller to variably adjust a duty ratio of said control signal according to colors of the plurality of color light-emitting devices based on the plurality of the converted color pixel values, wherein the controlling comprises controlling the light-emission controller to control first color light-emitting devices by a first duty ratio and controlling second color light-emitting devices by a second duty ratio. ### Claim 11 (depends on 10) The method of claim 10, wherein the outputting includes outputting the converted color pixel values in conjunction with the corresponding received color pixels, and the method further comprises storing the outputted converted color pixel values and the received color pixel values in a LUT form. ### Claim 12 (depends on 11) The method of claim 11, wherein if the color light-emitting devices are R, G, and B color light-emitting devices, the light-emission controller generates said control signal so that the turn-on times satisfy an equation expressible as: ix_org×Dx_org=ix_calc×Dx_calc wherein ix_org denotes a current value corresponding to a received pixel value, Dx_org denotes a turn-on time corresponding to the received pixel value, ix_calc denotes a current value calculated by the controller, Dx_calc denotes a turn-on time calculated by the controller, and x can be equal to each of R, G, and B. ### Claim 13 (depends on 10) The method of claim 10, wherein the converting comprises: calculating differences between the received color pixel values and the converted color pixel values, wherein the light-emission controller generates said control signal which variably controls the driving times according to colors of the plurality of color light-emitting devices based on the calculation result. ### Claim 14 (depends on 10) The method of claim 10, wherein the controlling of the light-emission controller includes adjusting the duty ratio so that the color light-emitting devices have a long turn-on time in correspondence with an order of a driving voltage of each of the color light-emitting devices. ### Claim 15 (depends on 10) The method of claim 10, wherein the color light-emitting devices are driven by a same power supply voltage.