# US 10,482,805 B2 · Display controller and display driving apparatus including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,482,805 B2 - Document ID: US10482805B2 - Status: Granted - Kind: B2 - Application number: 15/688,230 - Filed: 2017-08-28 - Published: 2018-08-09 - Granted: 2019-11-19 - Earliest claimed: 2017-02-09 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Chiahsin Lin; Jae Yoon Kim; Stanley Liao - Web page: https://patentgrep.com/patent/US10482805B2 ## CPC - G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)} - 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 3/3275: Details of drivers for data electrodes - G09G 3/3685: {Details of drivers for data electrodes} - G09G 2300/0408: Integration of the drivers onto the display substrate - G09G 2300/0465: Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness - G09G 2310/0248: Precharge or discharge of column electrodes before or after applying exact column voltages - G09G 2310/0264: Details of driving circuits - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - 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 2370/08: Details of image data interface between the display device controller and the data line driver circuit - 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 controller comprises a buffer configured to store first pixel data input to a source line during a first period, and second pixel data input to the source line during a second period, subsequent to the first period, and a data generating unit configured to generate control data by comparing each of the first pixel data and the second pixel data with desired reference data, and transfer the second pixel data and the control data to a source driver driving the source line. ## Claims ### Claim 1 A display controller comprising: a buffer configured to store first pixel data input to a source line during a first period, and second pixel data input to the source line during a second period, the second period being subsequent to the first period; and a data generating circuit configured to, generate control data by comparing each of the first pixel data and the second pixel data with desired reference data, the desired reference data is digital data corresponding to an intermediate voltage, the intermediate voltage being lower than a power supply voltage and higher than a ground voltage, and transfer the second pixel data and the control data to a source driver driving the source line. ### Claim 2 (depends on 1) The display controller of claim 1, wherein each of the first pixel data and the second pixel data includes N-bit digital data, where N is a natural number; and the desired reference data includes M-bit digital data, where M is a natural number smaller than N. ### Claim 3 (depends on 2) The display controller of claim 2, wherein the data generating circuit is configured to: select M number of significant bits from each of the first pixel data and the second pixel data; and compare the M number of significant bits from each of the first pixel data and the second pixel data with the desired reference data. ### Claim 4 (depends on 1) The display controller of claim 1, wherein the control data includes 1-bit digital data. ### Claim 5 (depends on 4) The display controller of claim 4, wherein the control data has a high logic value, in response to one of the first pixel data or the second pixel data being larger than the desired reference data and the other of the first pixel data and the second pixel data being smaller than the desired reference data. ### Claim 6 (depends on 5) The display controller of claim 5, wherein the display controller is configured to control the source driver to perform a precharge operation in response to the control data being set at the high logic value, the first pixel data being smaller than the desired reference data, and the second pixel data being larger than the desired reference data. ### Claim 7 (depends on 5) The display controller of claim 5, wherein the display controller is configured to control the source driver to perform a recycle operation in response to the control data being set at the high logic value, the first pixel data being larger than the desired reference data, and the second pixel data being smaller than the desired reference data. ### Claim 8 (depends on 4) The display controller of claim 4, wherein the control data has a low logic value, in response to the first pixel data and the second pixel data being larger than the desired reference data, or in response to the first pixel data and the second pixel data being smaller than the desired reference data. ### Claim 9 (depends on 1) The display controller of claim 1, wherein the data generating circuit is configured to generate source data by combining the control data with the second pixel data, and a most significant bit of the source data is the control data. ### Claim 10 (depends on 1) The display controller of claim 1, wherein the data generating circuit is configured to transfer the control data and the second pixel data to a shift register included in the source driver. ### Claim 11 (depends on 1) The display controller of claim 1, wherein the source driver is further configured to receive the intermediate voltage. ### Claim 12 A display driving apparatus comprising: a display controller configured to, compare each of first pixel data corresponding to a first source voltage and second pixel data corresponding to a second source voltage with reference data, and generate control data based on results of the comparison, wherein the first source voltage is input to a source line during a first period and a second source voltage is input to the source line during a second period, subsequent to the first period; and a source driver configured to input an intermediate voltage corresponding to the reference data to the source line during a portion of the second period, in response to the control data having a desired logic value. ### Claim 13 (depends on 12) The display driving apparatus of claim 12, wherein the source driver is configured to perform a precharge operation by inputting the intermediate voltage to the source line, in response to the control data having a high logic value and the first pixel data being smaller than the reference data. ### Claim 14 (depends on 12) The display driving apparatus of claim 12, wherein the source driver is configured to perform a recycle operation by inputting the intermediate voltage to the source line, in response to the control data having a high logic value and the first pixel data being larger than the reference data. ### Claim 15 (depends on 12) The display driving apparatus of claim 12, wherein the source driver includes: a shift register configured to store pixel data corresponding to a source voltage to be input to the source line; a digital-to-analog converter configured to convert the pixel data into the source voltage; a buffer circuit configured to sample the source voltage; a first switch connected between an output terminal of the buffer circuit and an input terminal of the source line; a second switch connected between a node outputting the intermediate voltage and the input terminal of the source line; and a switch control circuit configured to turn the first switch off and turn the second switch on, in response to the control data having a high logic value. ### Claim 16 A display driving apparatus comprising: a display controller configured to, store first pixel data and second pixel data, the second pixel data received after the first pixel data, and generate control data related to a precharge operation or a recycle operation based on the first pixel data, the second pixel data, and desired reference data, the generating the control data including, generating a first result based on the first pixel data and the desired reference data, generating a second result based on the second pixel data and the desired reference data, determining whether to input the desired reference data to a source line based on the first result and the second result, and generating the control data based on results of the determination; a source driver configured to receive the control data, and drive the source line based on the control data; and a display panel configured to output the second pixel data based on the source line. ### Claim 17 (depends on 16) The display driving apparatus of claim 16, wherein the first pixel data and the second pixel data are digital inputs; and the desired reference data corresponds to an intermediate voltage. ### Claim 18 (depends on 16) The display driving apparatus of claim 16, wherein the source driver is further configured to: perform the precharge operation in response to the first result indicating that the first pixel data is less than the desired reference data and the second result indicating that the second pixel data is greater than or equal to the desired reference data, and the control data is high; and perform the recycle operation in response to the first result indicating that the first pixel data is greater than or equal to the desired reference data and the second result indicating that the second pixel data is less than the desired reference data, and the control data is high. ### Claim 19 (depends on 16) The display driving apparatus of claim 16, wherein the source driver is further configured to drive the source line based on the second pixel data.