# US 11,308,840 B2 · Display device, timing controller and source driver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,308,840 B2 - Document ID: US11308840B2 - Status: Granted - Kind: B2 - Application number: 17/100,017 - Filed: 2020-11-20 - Published: 2021-06-10 - Granted: 2022-04-19 - Earliest claimed: 2019-12-06 - Assignees: Silicon Works Co., Ltd. - Applicants: Silicon Works Co., Ltd. - Inventors: Jung Min Choi; Jong Min Park; Woong Jin Oh - Web page: https://patentgrep.com/patent/US11308840B2 ## CPC - G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G09G 2310/0248: Precharge or discharge of column electrodes before or after applying exact column voltages - G09G 2310/0275: Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2330/021: Power management, e.g. power saving - G09G 2350/00: Solving problems of bandwidth in display systems - 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 The present disclosure relates to a technology for a low power operation of a display device. The present disclosure allows reducing power consumption by supplying image data of a pixel of a preceding line again for a pixel of a current line without transmitting new image data when image data are repeated in units of pixels. ## Claims ### Claim 1 A timing controller comprising: a controlling unit configured to compare first image data of a pixel of a current line with second image data of a pixel of a preceding line, to determine whether to include the first image data in a data packet based on a result of the comparison, and to insert a comparative indicator indicating the result of the comparison into the data packet; and a transmitting unit configured to transmit the data packet to a source driver, wherein the transmitting unit does not transmit the first image data to the source driver when the first image data is identical to the second image data, and wherein the comparative indicator indicates whether to include the first image data in the data packet or whether to transmit the first image data. ### Claim 2 (depends on 1) The timing controller of claim 1, wherein the data packet comprises N (N being a natural number equal to or greater than 2) unit interfaces (UIs), a first UI and a Nth UI are used to extract a clock, and the comparative indicator is inserted into a second UI or a (N−1)th UI. ### Claim 3 (depends on 1) The timing controller of claim 1, wherein the data packet comprises N (N being a natural number equal to or greater than 2) unit interfaces (UIs) and comprises M (M being a natural number equal to or greater than 1) additional UIs, and the comparative indicator is inserted into one of the additional UIs. ### Claim 4 A display device comprising: a source driver configured to receive image data and output a data voltage corresponding to the image data to a pixel from pixels; and a timing controller configured to transmit the image data to the source driver, wherein the timing controller compares first image data of a pixel of a current line with second image data of a pixel of a preceding line, determines whether to include the first image data in a data packet based on a result of the comparison, and insert a comparative indicator indicating the result of the comparison into the data packet, and, wherein the timing controller does not transmit the first image data to the source driver when the first image data is identical to the second image data, and wherein the comparative indicator indicates whether to include the first image data in the data packet or whether to transmit the first image data. ### Claim 5 (depends on 4) The display device of claim 4, wherein the source driver comprises a buffer configured to output the data voltage using a bias current based on the result of the comparison, and wherein the source driver changes the bias current and repeatedly outputs a data voltage corresponding to the second image data of the pixel of the preceding line when the first image data is identical to the second image data. ### Claim 6 (depends on 5) The display device of claim 5, wherein the source driver fixes the bias current to a minimum value or a predetermined value. ### Claim 7 (depends on 6) The display device of claim 6, wherein the source driver comprises a bias controlling unit configured to adjust the bias current and to supply the bias current to the buffer, and the bias controlling unit selects one of multiple currents as the bias current. ### Claim 8 (depends on 5) The display device of claim 5, wherein the source driver operates based on the comparative indicator. ### Claim 9 (depends on 8) The display device of claim 8, wherein the source driver comprises a bias controlling unit configured to adjust the bias current and to supply the bias current to the buffer, and the bias controlling unit changes the bias current, based on the comparative indicator. ### Claim 10 (depends on 8) The display device of claim 8, wherein the source driver comprises a latch configured to latch the second image data of the pixel of the preceding line, and the latch repeatedly outputs a data voltage corresponding to the second image data of the pixel of the preceding line, based on the comparative indicator. ### Claim 11 (depends on 8) The display device of claim 8, wherein the comparative indicator comprises information on non-transmission of the first image data of the pixel of the current line, repeated output of the second image data of the pixel of the preceding line, and change of the bias current. ### Claim 12 (depends on 8) The display device of claim 8, wherein the data packet comprises a region indicating a clock, and the comparative indicator is included in the region indicating the clock or in a region preceding or following the region indicating the clock. ### Claim 13 (depends on 4) The display device of claim 4, wherein: the timing controller compares second image data of a pixel of a preceding line with first image data of a pixel of a current line, and transmits the first image data of the pixel of the current line when the first image data of the pixel of the current line is determined to be different from the second image data of the pixel of the preceding line; and the source driver performs charge sharing when the first image data of the pixel of the current line is determined to be different from the second image data of the pixel of the preceding line. ### Claim 14 (depends on 13) The display device of claim 13, wherein: the timing controller includes the image data in a data packet, transmits the image data through transmission of the data packet, generates a CS (charge sharing) indicator indicating whether to perform the charge sharing, and includes the CS indicator in the data packet; and the source driver performs charge sharing based on the CS indicator. ### Claim 15 (depends on 13) The display device of claim 13, wherein the source driver performs charge sharing with respect to multiple buffers having identical polarity.