# US 11,308,837 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,308,837 B2 - Document ID: US11308837B2 - Status: Granted - Kind: B2 - Application number: 16/848,763 - Filed: 2020-04-14 - Published: 2021-03-25 - Granted: 2022-04-19 - Earliest claimed: 2019-09-24 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Seok Gyu Ban; Kyung Man Kim; Sang Jae Yeo - Web page: https://patentgrep.com/patent/US11308837B2 ## 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 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2310/0294: Details of sampling or holding circuits arranged for use in a driver for data electrodes - G09G 2310/06: Details of flat display driving waveforms - G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - G09G 2320/0295: by monitoring each display pixel - G09G 2320/043: Preventing or counteracting the effects of ageing - 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 device includes a data line, a pixel electrically connected to the data line, a data driver for outputting a data voltage, and a transmitter electrically connected between an output terminal of the data driver and the data line. The transmitter may transmit an instance of the data voltage to the data line in a first period. The transmitter may amplify a second instance of the data voltage to generate a reference voltage and then transmit the reference voltage to the data line in a second period different from the first period. The pixel includes a light emitting element for emitting light in response to the first instance of the data voltage. A voltage level of the reference voltage may be higher than a voltage level of the data voltage. ## Claims ### Claim 1 A display device comprising: a data line; a pixel electrically connected to the data line; a data driver configured to output a data voltage; and a transmitter electrically connected between an output terminal of the data driver and the data line, the transmitter transmitting a first instance of the data voltage to the data line in a first period, the transmitter amplifying a second instance of the data voltage to generate a reference voltage and then transmitting the reference voltage to the data line in a second period different from the first period, wherein the pixel includes a light emitting element emitting light in response to the first instance of the data voltage, wherein a voltage level of the reference voltage is higher than a voltage level of the data voltage, and wherein the transmitter includes: an amplifier electrically connected between the output terminal of the data driver and the data line, and a bypass switch electrically connected in parallel to the amplifier between the output terminal of the data driver and the data line. ### Claim 2 (depends on 1) The display device of claim 1, wherein the light emitting element emits light in the first period and emits no light in the second period. ### Claim 3 (depends on 1) The display device of claim 1, wherein the voltage level of the reference voltage is in a range of about 1.5 times of a maximum voltage level of the data voltage to about 2.5 times of the maximum voltage level of the data voltage. ### Claim 4 (depends on 1) The display device of claim 1, wherein each of the output terminal of the data driver and an input terminal of the amplifier is electrically connected through the bypass switch to an output terminal of the amplifier when the bypass switch is turned on. ### Claim 5 (depends on 4) The display device of claim 4, wherein a gain of the amplifier is about 2, and wherein the amplifier amplifies the second instance of the data voltage by about 2 times of a maximum voltage level of the data voltage. ### Claim 6 (depends on 4) The display device of claim 4, wherein the bypass switch is turned on in the first period and is turned off in at least a portion of the second period. ### Claim 7 (depends on 6) The display device of claim 6, further comprising: a sensor; and a readout line electrically connected to the sensor, wherein the readout line is connected to a first electrode of the light emitting element, and wherein characteristic information of the light emitting element is output to the sensor through the readout line in the second period. ### Claim 8 (depends on 4) The display device of claim 4, further comprising: a first power line; a second power line; a scan line; a sensing control line; and a readout line, wherein the pixel further includes: a first transistor including a first electrode electrically connected to the first power line, a second electrode electrically connected to a second node, and a gate electrode electrically connected to a first node; a second transistor including a first electrode electrically connected to the data line, a second electrode electrically connected to the first node, and a gate electrode electrically connected to the scan line; a third transistor including a first electrode electrically connected to the second node, a second electrode electrically connected to the readout line, and a gate electrode electrically connected to the sensing control line; and a capacitor electrically connected between the first node and the second node. ### Claim 9 (depends on 8) The display device of claim 8, wherein the second period includes a first sub-period, a second sub-period, and a third sub-period in sequence, and wherein, in the first sub-period, a gate-on voltage is applied to the scan line, a gate-on voltage is applied to the sensing control line, the bypass switch is turned off, and an initialization voltage is applied to the readout line. ### Claim 10 (depends on 9) The display device of claim 9, wherein, in the second sub-period, a gate-off voltage is applied to the sensing control line. ### Claim 11 (depends on 10) The display device of claim 10, wherein, in the second sub-period, a node voltage of the second node is changed from a voltage level of the initialization voltage to a voltage level of a threshold voltage of the light emitting element. ### Claim 12 (depends on 10) The display device of claim 10, wherein, in the third sub-period, a gate-off voltage is applied to the scan line, and a gate-on voltage is applied to the sensing control line. ### Claim 13 (depends on 12) The display device of claim 12, wherein, in the third sub-period, the bypass switch is turned on. ### Claim 14 (depends on 12) The display device of claim 12, wherein, in the third sub-period, the bypass switch is turned off. ### Claim 15 (depends on 1) The display device of claim 1, wherein the light emitting element includes a first electrode, a second electrode overlapping the first electrode, and a first organic emitting layer disposed between the first electrode and the second electrode. ### Claim 16 (depends on 15) The display device of claim 15, wherein the light emitting element further includes a second organic emitting layer disposed between the first organic emitting layer and the second electrode. ### Claim 17 A display device comprising: a data line; a pixel electrically connected to the data line; a data driver configured to output a data voltage; and a transmitter electrically connected between an output terminal of the data driver and the data line, wherein the pixel includes a light emitting element emitting light in response to a first instance of the data voltage, and wherein the transmitter includes: an amplifier electrically connected between the output terminal of the data driver and the data line, and a bypass switch electrically connected in parallel to the amplifier between the output terminal of the data driver and the data line. ### Claim 18 (depends on 17) The display device of claim 17, wherein the transmitter transmits the first instance of the data voltage to the data line through the bypass switch in a first period, wherein the transmitter amplifies a second instance of the data voltage through the amplifier to generate a reference voltage and then transmits the reference voltage to the data line in a second period different from the first period, and wherein a voltage level of the reference voltage is higher than a voltage level of the data voltage. ### Claim 19 (depends on 18) The display device of claim 18, wherein the light emitting element emits light in the first period and emits no light in the second period. ### Claim 20 (depends on 19) The display device of claim 19, further comprising: a sensor; and a readout line electrically connected to the sensor, wherein the readout line is connected to a first electrode of the light emitting element, and wherein characteristic information of the light emitting element is output to the sensor through the readout line in the second period.