# US 10,770,022 B2 · Source driver and a display driver integrated circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,022 B2 - Document ID: US10770022B2 - Status: Granted - Kind: B2 - Application number: 16/288,166 - Filed: 2019-02-28 - Published: 2019-11-07 - Granted: 2020-09-08 - Earliest claimed: 2018-05-04 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Joway Chen; Chul Ho Choi; Dip Wu; Hyeong Tae Kim; Yuwen Chiou; Jin Woo Kim - Web page: https://patentgrep.com/patent/US10770022B2 ## CPC - G09G 3/3688: {suitable for active matrices only} - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3677: {suitable for active matrices only} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3275: Details of drivers for data electrodes - G09G 2320/041: Temperature compensation - G09G 2330/021: Power management, e.g. power saving - 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 source driver including: a first source line; a second source line; a charge sharing switch which controls a connection between the first source line and the second source line; a first cross charge sharing switch which controls a connection between a first capacitor and the first source line, and a connection between a second capacitor and the second source line; and a second cross charge sharing switch which controls a connection between the first capacitor and the second source line, and a connection between the second capacitor and the first source line. ## Claims ### Claim 1 A source driver, comprising: a first source line connected to a first terminal; a second source line connected to a second terminal; a charge sharing switch which controls a connection between the first source line and the second source line; a first cross charge sharing switch which controls a connection between a first capacitor and the first source line, and a connection between a second capacitor and the second source line, wherein a first cross charge sharing line is connected to a first end of the first cross charge sharing switch, a second end of the first cross charge sharing switch is connected to the first source line, and the first capacitor is connected to the first cross charge sharing line though a third terminal; and a second cross charge sharing switch which controls a connection between the first capacitor and the second source line, and a connection between the second capacitor and the first source line. ### Claim 2 (depends on 1) The source driver of claim 1, wherein, while the first cross charge sharing switch is turned on, the charge sharing switch and the second cross charge sharing switch are turned off, and while the second cross charge sharing switch is turned on, the charge sharing switch and the first cross charge sharing switch, are turned off. ### Claim 3 (depends on 2) The source driver of claim 2, wherein, when the first cross charge sharing switch is turned on, a part of a charge of the first source line is provided to the first capacitor, and a charge stored in the second capacitor is provided to the second source line. ### Claim 4 (depends on 2) The source driver of claim 2, wherein, when the second cross charge sharing switch is turned on, a charge stored in the first capacitor is provided to the second source line, and a part of a charge of the first source line is provided to the second capacitor. ### Claim 5 (depends on 1) The source driver of claim 1, wherein, while the charge sharing switch is turned on, the first cross charge sharing switch and the second cross charge sharing switch are turned off, and charges of the first source line and the second source line are shared with each other. ### Claim 6 (depends on 1) The source driver of claim 1, further comprising: an output switch which controls a connection between the first source line and a first buffer, and a connection between the second source line and a second buffer, wherein, while the output switch is turned off, one of the first cross charge sharing switch and the second cross charge sharing switch is first turned on, the charge sharing switch is second turned on, and the other one of the first cross charge sharing switch and the second cross charge sharing switch is third turned on. ### Claim 7 (depends on 6) The source driver of claim 6, wherein a sequence of turning-on the first cross charge sharing switch and the second cross charge sharing switch depends on a polarity signal. ### Claim 8 A display driver integrated circuit (IC), comprising: a source driver which drives a data line of a display panel; a gate driver which drives a gate line of the display panel; and a controller which controls the source driver and the gate driver, wherein the source driver includes a first capacitor, a second capacitor and a channel buffer, and the channel buffer includes: a first source line; a second source line; a charge sharing switch which controls a connection between the first source line and the second source line; a first cross charge sharing switch which controls a connection between the first capacitor and the first source line, and a connection between the second capacitor and the second source line, wherein the first capacitor is connected to a first cross charge sharing line through a first terminal and the second capacitor is connected to a second cross charge sharing line through a second terminal; and a second cross charge sharing switch which controls a connection between the first capacitor and the second source line, and a connection between the second capacitor and the first source line. ### Claim 9 (depends on 8) The display driver IC of claim 8, wherein, while the first cross charge sharing switch is turned on, the charge sharing switch and the second cross charge sharing switch are turned off, and while the second cross charge sharing switch is turned on, the charge sharing switch and the first cross charge sharing switch are turned off. ### Claim 10 (depends on 9) The display driver C of claim 9, wherein, when the first cross charge sharing switch is turned on, a part of a charge of the first source line is provided to the first capacitor, and a charge stored in the second capacitor is provided to the second source line. ### Claim 11 (depends on 9) The display driver IC of claim 9, wherein, when the second cross charge sharing switch is turned on, a charge stored in the first capacitor is provided to the second source line, and a part of a charge of the first source line is provided to the second capacitor. ### Claim 12 (depends on 8) The display driver IC of claim 8, wherein the channel buffer includes a first buffer, a second buffer, and an output switch, the output switch controlling a connection between the first source line and the first buffer and a connection between the second source line and the second buffer, wherein, while the output switch is turned off, one of the first cross charge sharing switch and the second cross charge sharing switch is first turned on, the charge sharing switch is second turned on, and the other one of the first cross charge sharing switch and the second cross charge sharing switch is third turned on. ### Claim 13 (depends on 12) The display driver 1C of claim 12, wherein a sequence of turning-on the first cross charge sharing switch and the second cross charge sharing switch depends on a polarity signal. ### Claim 14 A source driver, comprising: a first source line connected to a first terminal, a second source line connected to a second terminal, a third source line connected to a third terminal and a fourth source line connected to a fourth terminal; a plurality of charge sharing switches which control connections of the first source line, the second source line, the third source line and the fourth source line to each other; a plurality of first cross charge sharing switches which control connections between a first capacitor, the first source line and the third source line, and connections bet wen a second capacitor, the second source line and the fourth source line, wherein the first capacitor is connected to a first cross charge sharing line through a fifth terminal and the second capacitor is connected to a second cross charge sharing line through a sixth terminal; and a plurality of second cross charge sharing switches which control connections between the first capacitor, the second source line and the fourth source line, and connections between the second capacitor, the first source line and the third source line. ### Claim 15 (depends on 14) The source driver of claim 14, wherein, while the plurality of first cross charge sharing switches are turned on, the plurality of charge sharing switches and the plurality of second cross, charge sharing switches are turned off, and while the plurality of second cross charge sharing switches are turned on, the plurality of charge sharing switches and the plurality of first cross charge sharing switches are turned off. ### Claim 16 (depends on 15) The source driver of claim 15, wherein, when the plurality of first cross charge sharing switches are turned on, a part of a charge of the first source line and the third source line is provided to the first capacitor, and a charge stored in the second capacitor is provided to the second source line and the fourth source line. ### Claim 17 (depends on 15) The source driver of claim 15, wherein, when the plurality of second cross charge sharing switches are turned on, a charge stored in the first capacitor is provided to the second source line and the fourth source line, and a part of a charge of the first source line and the third source line is provided to the second capacitor. ### Claim 18 (depends on 14) The source driver of claim 14, wherein, while the plurality of charge sharing switches are turned on, the plurality of first cross charge sharing switches and the plurality of second cross charge sharing switches are turned off, charges of the first source line and the second source line are shared with each other, and charges of the third source line and the fourth source line are shared with each other. ### Claim 19 (depends on 14) The source driver of claim 14, further comprising: a plurality of output switches which control connections between the first source line, the second source line, the third source line and the fourth source line and a first buffer, a second buffer, a third buffer and a fourth buffer, respectively, wherein, while the plurality of output switches are turned off, one of the plurality of first cross charge sharing switches and the plurality of second cross charge sharing switches are first turned on, the plurality of charge sharing switches are second turned on, and the other one of the plurality of first cross charge sharing switches and the plurality of second cross charge sharing switches are third turned on. ### Claim 20 (depends on 19) The source driver of claim 19, wherein an order of turning-on the plurality of first cross charge sharing switches and the plurality of second cross charge sharing switches depends on a polarity signal.