# US 10,872,576 B2 · Display driver IC > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,576 B2 - Document ID: US10872576B2 - Status: Granted - Kind: B2 - Application number: 16/339,538 - Filed: 2017-09-06 - Published: 2019-08-01 - Granted: 2020-12-22 - Earliest claimed: 2016-10-05 - Assignees: Rohm Co., Ltd. - Applicants: Rohm Co., Ltd. - Inventors: Yasuhito Sugimoto; Sukenori Ito; Hiromitsu Nakaoka - Web page: https://patentgrep.com/patent/US10872576B2 ## 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 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G01R 31/28: Testing of electronic circuits, e.g. by signal tracer ({EMC, EMP or similar testing of electronic circuits G01R31/002;} testing for short-circuits, discontinuities, leakage or incorrect line connection G01R31/50; checking computers {or computer components} G06F11/00; checking static stores for correct operation G11C29/00 {; testing receivers or transmitters of transmission systems H04B17/00}) - G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)} - G09G 3/04: for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments {using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions} - G09G 3/18: using liquid crystals - G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)} - H10D 84/00: Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers - H10D 84/038: {using silicon technology, e.g. SiGe} - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2310/0289: Details of voltage level shifters arranged for use in a driving circuit - G09G 2330/08: Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared - G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof - G09G 2370/08: Details of image data interface between the display device controller and the data line driver circuit - G09G 2380/10: Automotive applications - 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) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract A display driver IC (200) comprises: a digital circuit including a logic circuit (2); an output unit (11) for outputting, to the outside, a drive control signal with a level corresponding to the output from the logic circuit; and at least one of a first decision unit (21) for determining whether or not an abnormality is present in the register value in a register in the digital circuit and a second decision unit (22) for determining whether or not the level of the drive control signal is the level corresponding to the output from the logic circuit. ## Claims ### Claim 1 A display driver IC comprising: a digital circuit including a logic circuit; an output unit configured to output to outside a drive control signal having a level commensurate with an output of the logic circuit; a first decision unit configured to check whether or not there is an abnormality in a register value of a register in the digital circuit; a ground potential terminal connected to a ground potential; and a ground potential conductor pattern connected to the ground potential terminal, wherein the first decision unit includes at least one data flip-flop, and is configured to determine that there is an abnormality in the register value of the register in the digital circuit when a value written to the data flip-flop does not match a value read from the data flip-flop, and the data flip-flop is provided near a place with a highest impedance with respect to the ground potential terminal within the ground potential conductor pattern. ### Claim 2 (depends on 1) The display driver IC according to claim 1, wherein a value written to the data flip-flop after the data flip-flop is reset is an inverted value of the value written to the data flip-flop before the data flip-flop is reset. ### Claim 3 (depends on 1) The display driver IC according to claim 1, wherein the display driver IC is in a rectangular shape in a plan view, and the data flip-flop is provided in each of four corners of the rectangular shape. ### Claim 4 (depends on 1) The display driver IC according to claim 1, further comprising: a supply voltage terminal to which a supply voltage is applied; and a supply voltage conductor pattern connected to the supply voltage terminal, wherein the data flip-flop is provided near a place with a highest impedance with respect to the supply voltage terminal within the supply voltage conductor pattern. ### Claim 5 (depends on 1) The display driver IC according to claim 1, comprising: a second decision unit configured to check whether or not a level of the drive control signal is a level commensurate with an output of the logic circuit, wherein the level commensurate with the output of the logic circuit has one of three or more values, and the second decision unit is configured to sense the level of the drive control signal only when the level commensurate with the output of the logic circuit has one of particular two values to check whether or not the level of the drive control signal is a level commensurate with the output of the logic circuit. ### Claim 6 (depends on 1) The display driver IC according to claim 1, further comprising: a third decision unit configured to check whether or not there is an abnormality in data that the logic circuit receives from outside; and a fourth decision unit configured to check whether or not there is a breakage in a display panel to which the display driver IC is connected by COG mounting. ### Claim 7 (depends on 1) A display device comprising: a host device; the display driver IC according to claim 1 configured to receive data from the host device; and a display panel configured to receive a drive control signal from the display driver IC. ### Claim 8 (depends on 7) A vehicle comprising the display device according to claim 7. ### Claim 9 A display driver IC comprising: a digital circuit including a logic circuit; an output unit configured to output to outside a drive control signal having a level commensurate with an output of the logic circuit; a first decision unit configured to check whether or not there is an abnormality in a register value of a register in the digital circuit; a supply voltage terminal to which a supply voltage is applied; and a supply voltage conductor pattern connected to the supply voltage terminal, wherein the first decision unit includes at least one data flip-flop, and is configured to determine that there is an abnormality in the register value of the register in the digital circuit when a value written to the data flip-flop does not match a value read from the data flip-flop, and the data flip-flop is provided near a place with a highest impedance with respect to the supply voltage terminal within the supply voltage conductor pattern. ### Claim 10 (depends on 9) The display driver IC according to claim 9, wherein a value written to the data flip-flop after the data flip-flop is reset is an inverted value of the value written to the data flip-flop before the data flip-flop is reset. ### Claim 11 (depends on 9) The display driver IC according to claim 9, wherein the display driver IC is in a rectangular shape in a plan view, and the data flip-flop is provided in each of four corners of the rectangular shape. ### Claim 12 (depends on 9) The display driver IC according to claim 9, comprising: a second decision unit configured to check whether or not a level of the drive control signal is a level commensurate with an output of the logic circuit, wherein the level commensurate with the output of the logic circuit has one of three or more values, and the second decision unit is configured to sense the level of the drive control signal only when the level commensurate with the output of the logic circuit has one of particular two values to check whether or not the level of the drive control signal is a level commensurate with the output of the logic circuit. ### Claim 13 (depends on 9) The display driver IC according to claim 9, further comprising: a third decision unit configured to check whether or not there is an abnormality in data that the logic circuit receives from outside; and a fourth decision unit configured to check whether or not there is a breakage in a display panel to which the display driver IC is connected by COG mounting. ### Claim 14 (depends on 9) A display device comprising: a host device; the display driver IC according to claim 9 configured to receive data from the host device; and a display panel configured to receive a drive control signal from the display driver IC. ### Claim 15 (depends on 14) A vehicle comprising the display device according to claim 14.