# US 2014/0198086 A1 · Source driver and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0198086 A1 - Document ID: US20140198086A1 - Status: Published application - Kind: A1 - Application number: 13/739,930 - Filed: 2013-01-11 - Published: 2014-07-17 - Earliest claimed: 2013-01-11 - Assignees: Himax Technologies Limited - Applicants: Himax Technologies Limited - Inventors: Jen-Wen Cheng; Chuan-Che Lee; Chin-Tien Chang - Web page: https://patentgrep.com/patent/US20140198086A1 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - 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 3/3688: {suitable for active matrices only} - 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: 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 controller, a plurality of flip-flops, a plurality of shift registers and a plurality of driving channels is provided. The controller extracts control information from an image data stream. Each of the flip-flops respectively receives a corresponding control bit of the control information, and output the corresponding control bit. The shift registers correspond to the flip-flops one by one, and sequentially transmit an enable pulse. Each of the shift registers determines whether to output the enable pulse according to the control bit outputted by the corresponding flip-flop. The driving channels correspond to the shift registers one by one. Each of the driving channels switches an operation state into an enable mode or a disable mode according to the enable pulse outputted by the corresponding shift register. ## Claims ### Claim 1 A source driver, comprising: a controller, extracting control information from an image data stream; a plurality of flip-flops, electrically connected to each other in series, receiving the control information, wherein each of the flip-flops respectively receives a corresponding control bit of the control information, and output the corresponding control bit; a plurality of shift registers, electrically connected to each other in series, and corresponding to the flip-flops one by one, wherein the shift registers sequentially transmit an enable pulse, and during a process of transmitting the enable pulse, each of the shift registers determines whether to output the enable pulse according to the control bit output by the corresponding flip-flop; and a plurality of driving channels, corresponding to the shift registers one by one, wherein each of the driving channels switches an operation state to an enable mode or a disable mode according to the enable pulse outputted by the corresponding shift register. ### Claim 2 (depends on 1) The source driver as claimed in claim 1, further comprising: a plurality of level shifters, corresponding to the flip-flops, wherein each of the level shifters determines whether to generate a disable voltage to turn off an output buffer of one of the driving channels according to the control bit output by the corresponding flip-flop. ### Claim 3 (depends on 1) The source driver as claimed in claim 1, wherein when the enable pulse output by the corresponding shift register is received, the operation state is switched to the enable mode, and when the enable pulse output by the corresponding shift register is not received, the operation state is switched to the disable mode. ### Claim 4 (depends on 1) The source driver as claimed in claim 1, wherein the controller extracts a plurality of display data from the image data stream, and each of the driving channels accesses the plurality of display data in the enable mode, and disables to access the plurality of display data in the disable mode. ### Claim 5 (depends on 1) The source driver as claimed in claim 1, wherein the controller samples a start pulse signal by using a polarity reversal signal and accordingly generates a sampling signal, wherein when the sampling signal has a first level, the controller extracts a plurality of display data from the image data stream according to a frame start signal and the start pulse signal, and when the sampling signal has a second level, the controller subsequently extracts the control information from the image data stream according to the start pulse signal. ### Claim 6 (depends on 5) The source driver as claimed in claim 5, wherein when the sampling signal has the second level, the controller extracts the control information from the blanking region of the image data stream. ### Claim 7 (depends on 5) The source driver as claimed in claim 5, wherein the frame start signal, the start pulse signal and the polarity reversal signal are generated by a timing controller. ### Claim 8 A display device, comprising: a display panel; and a plurality of source drivers, driving the display panel, and each of the source drivers comprising: a controller, extracting control information from an image data stream; a plurality of flip-flops, electrically connected to each other in series, receiving the control information, wherein each of the flip-flops respectively receives a corresponding control bit of the control information, and output the corresponding control bit; a plurality of shift registers, electrically connected to each other in series, and corresponding to the flip-flops one by one, wherein the shift registers sequentially transmit an enable pulse, and during a process of transmitting the enable pulse, each of the shift registers determines whether to output the enable pulse according to the control bit output by the corresponding flip-flop; and a plurality of driving channels, correspond to the shift registers one by one, wherein each of the driving channels switches an operation state to an enable mode or a disable mode according to the enable pulse outputted by the corresponding shift register. ### Claim 9 (depends on 8) The display device as claimed in claim 8, wherein each of the source drivers further comprises: a plurality of level shifters, corresponding to the flip-flops, wherein each of the level shifters determines whether to generate a disable voltage to turn off an output buffer of one of the driving channels according to the control bit output by the corresponding flip-flop. ### Claim 10 (depends on 8) The display device as claimed in claim 8, wherein when the enable pulse output by the corresponding shift register is received, the operation state is switched to the enable mode, and when the enable pulse output by the corresponding shift register is not received, the operation state is switched to the disable mode. ### Claim 11 (depends on 8) The display device as claimed in claim 8, wherein the controller extracts a plurality of display data from the image data stream, and each of the driving channels accesses the plurality of display data in the enable mode, and disables to access the plurality of display data in the disable mode. ### Claim 12 (depends on 8) The display device as claimed in claim 8, wherein the controller samples a start pulse signal by using a polarity reversal signal and accordingly generates a sampling signal, wherein when the sampling signal has a first level, the controller extracts a plurality of display data from the image data stream according to a frame start signal and the start pulse signal, and when the sampling signal has a second level, the controller subsequently extracts the control information from the image data stream according to the start pulse signal. ### Claim 13 (depends on 12) The display device as claimed in claim 12, wherein when the sampling signal has the second level, the controller extracts the control information from the blanking region of the image data stream. ### Claim 14 (depends on 12) The display device as claimed in claim 12, further comprising: a time controller, generating the frame start signal, the start pulse signal and the polarity reversal signal.