# US 11,308,877 B2 · Display driving device and display device 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 11,308,877 B2 - Document ID: US11308877B2 - Status: Granted - Kind: B2 - Application number: 16/953,668 - Filed: 2020-11-20 - Published: 2021-05-20 - Granted: 2022-04-19 - Earliest claimed: 2019-11-20 - Assignees: Silicon Works Co., Ltd. - Applicants: Silicon Works Co., Ltd. - Inventors: Jeong Lee; Sung Ha Kim; Yong Sung Ahn; Kyung Min Shin; Jung Ryeol Park - Web page: https://patentgrep.com/patent/US11308877B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0809: Several active elements per pixel in active matrix panels - G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2310/0245: Clearing or presetting the whole screen independently of waveforms, e.g. on power-on (G09G2310/063 takes precedence) - G09G 2320/0295: by monitoring each display pixel - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - 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 Provided are a display driving device capable of accurately detecting characteristics of pixels of a display panel regardless of an offset of an amplifier, and a display device including the same. The display device includes a display panel including pixels and a display driving device including a sense circuit configured to detect pixel signals from the pixels. The sense circuit includes sense amplifiers configured to provide the first reference voltage to the pixels so that the pixels are programmed using a first reference voltage in a programming mode. ## Claims ### Claim 1 A display device comprising: a display panel comprising pixels; and a display driving device comprising a sense circuit configured to detect pixel signals from the pixels, wherein the sense circuit comprises sense amplifiers configured to provide a first reference voltage to the pixels so that the pixels are programmed using the first reference voltage in a programming mode, wherein each of the pixels comprises: an organic light emitting diode (OLED); and a driving transistor configured to supply a current to the OLED, wherein the pixels are programmed using a sum of the first reference voltage and a threshold voltage of the driving transistor in the programming mode subsequent to an initialization mode. ### Claim 2 (depends on 1) The display device of claim 1, wherein the sense amplifier operates as a unit gain amplifier in the programming mode. ### Claim 3 (depends on 2) The display device of claim 2, wherein in the programming mode, the sense amplifier has a negative input stage and an output stage coupled, and provides a data line of the pixel with the first reference voltage applied to a positive input stage of the sense amplifier. ### Claim 4 (depends on 1) The display device of claim 1, wherein the sense amplifier operates as an integrator in a sensing mode subsequent to the programming mode. ### Claim 5 (depends on 4) The display device of claim 4, wherein the sense amplifier operates as the integrator after providing a data line of the pixel with a second reference voltage applied to a positive input stage of the sense amplifier in the sensing mode. ### Claim 6 (depends on 5) The display device of claim 5, wherein the second reference voltage is set as a lower level than the first reference voltage. ### Claim 7 (depends on 1) The display device of claim 1, wherein each of the pixels and the sense amplifier are coupled through a data line. ### Claim 8 (depends on 1) The display device of claim 1, wherein each of the pixels comprises: a first transistor configured to couple a source terminal of the driving transistor and a data line; a second transistor configured to couple a drain terminal of the driving transistor and a first power supply voltage terminal; a third transistor configured to couple the source terminal of the driving transistor and the OLED; a fourth transistor configured to couple the drain terminal of the driving transistor and a gate terminal of the driving transistor; a capacitor configured to have one end coupled to the fourth transistor and the gate terminal and the other end coupled to a fifth transistor and to store charges; and the fifth transistor configured to couple the other end of the capacitor and an initial voltage terminal, wherein the OLED has one end coupled to the third transistor and the other end coupled to a second power supply voltage terminal, and the other end of the capacitor and the one end of the OLED are coupled. ### Claim 9 (depends on 8) The display device of claim 8, wherein an initial voltage of the initial voltage terminal is set as a level equal to or lower than a level of a second power supply voltage of the second power supply voltage terminal. ### Claim 10 (depends on 8) The display device of claim 8, wherein in the initialization mode, a first node of the gate terminal is initialized as a first power supply voltage by turning off the first and third transistors and turning on the second, fourth and fifth transistors. ### Claim 11 (depends on 10) The display device of claim 10, wherein in the programming mode subsequent to the initialization mode, the first node of the gate terminal is programmed using a sum of the first reference voltage and a threshold voltage of the driving transistor by turning off the second and third transistors and turning on the first, fourth and fifth transistors. ### Claim 12 (depends on 11) The display device of claim 11, wherein in the sensing mode subsequent to the programming mode, the pixel signal is detected by turning off the third, fourth and fifth transistors and turning on the first and second transistors. ### Claim 13 A display driving device comprising: a sense circuit configured to detect pixel signals from pixels of a display panel, wherein the sense circuit comprises a sense amplifiers configured to provide a first reference voltage to the pixels so that the pixels are programmed using the first reference voltage in a programming mode, wherein each of the pixels comprises: an organic light emitting diode (OLED); and a driving transistor configured to supply a current to the OLED, wherein the pixels are programmed using a sum of the first reference voltage and a threshold voltage of the driving transistor in the programming mode subsequent to an initialization mode. ### Claim 14 (depends on 13) The display driving device of claim 13, wherein the sense amplifier transmits the first reference voltage to a data line of the pixel in the programming mode. ### Claim 15 (depends on 14) The display driving device of claim 14, wherein the sense amplifier detects the pixel signal through the data line in a sensing mode subsequent to the programming mode. ### Claim 16 (depends on 13) The display driving device of claim 13, wherein in the programming mode, the sense amplifier operates as a unit gain amplifier and provides a data line of the pixel with the first reference voltage applied to an input stage of the sense amplifier. ### Claim 17 (depends on 13) The display driving device of claim 13, wherein in a sensing mode subsequent to the programming mode, the sense amplifier provides a second reference voltage to a data line of the pixel and operates as an integrator. ### Claim 18 (depends on 17) The display driving device of claim 17, wherein the second reference voltage is set as a lower level than the first reference voltage. ### Claim 19 A display device comprising: a display panel comprising pixels; a display driving device comprising a sense circuit configured to detect pixel signals from the pixels, wherein the sense circuit comprises a sense amplifiers configured to provide a first reference voltage to the pixels so that the pixels are programmed using the first reference voltage in a programming mode; and a controller configured to control the pixels and the sense circuit in an initialization mode in which the pixels are initialized, the programming mode in which the pixels are programmed, and a sensing mode in which the pixel signals are detected; wherein each of the pixels comprises: an organic light emitting diode (OLED); and a driving transistor configured to supply a current to the OLED, wherein the pixels are programmed using a sum of the first reference voltage and a threshold voltage of the driving transistor in the programming mode subsequent to an initialization mode. ### Claim 20 (depends on 19) The display device of claim 19, wherein the controller controls the pixels so that the pixels are initialized using a first power supply voltage in the initialization mode, controls the pixels and the sense amplifier so that the pixels are programmed using the first reference voltage of the sense amplifier in the programming mode, and controls the pixels and the sense amplifier so that the pixel signals are detected by the sense amplifier in the sensing mode.