# US 7,746,298 B2 · Organic light emitting display and driving method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,746,298 B2 - Document ID: US7746298B2 - Status: Granted - Kind: B2 - Application number: 11/113,444 - Filed: 2005-04-22 - Published: 2005-11-17 - Granted: 2010-06-29 - Earliest claimed: 2004-05-11 - Assignees: Samsung Mobile Display Co., Ltd. - Inventors: Dong-Yong Shin - Web page: https://patentgrep.com/patent/US7746298B2 ## CPC - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/325: the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes - 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 light emission device according to the present invention includes a plurality of pixel circuits in a matrix. A plurality of first scan lines transmits a selection signal to select the pixel circuits. A plurality of second scan lines transmits an emission signal to control the duration of light emission of the pixel circuits. A scan driver sequentially delays a primary signal having a first-level pulse about a first period for generating a plurality of secondary signals, inverting the plurality of secondary signals for outputting the emission signal, and generating a signal having a second-level pulse when the secondary signal and the emission signal are in the first-level. ## Claims ### Claim 1 An organic light emitting display comprising: a plurality of pixel circuits in a matrix; a plurality of first scan lines for transmitting selection signals; a plurality of second scan lines for transmitting emission signals to control a duration of light emission of the pixel circuits; and a scan driver for sequentially delaying a primary signal having a pulse at a first voltage level by a first period to generate a plurality of secondary signals, for inverting the plurality of secondary signals and outputting them as the emission signals, and for generating the selection signals having a pulse at a second voltage level when the secondary signals and the emission signals are at the first voltage level. ### Claim 2 (depends on 1) The organic light emitting display according to claim 1, wherein the scan driver comprises a shift register for sequentially delaying the primary signal by the first period to generate the plurality of secondary signals. ### Claim 3 (depends on 2) The organic light emitting display device according to claim 2, wherein the secondary signals comprise a first secondary signal and a second secondary signal, and wherein the scan driver is configured to invert the second secondary signal and to output the inverted second secondary signal as an emission signal of the emission signals, and to generate the first selection signal of the selection signals having a pulse at the second voltage level when the first secondary signal and the emission signal of the emission signals are both at the first voltage level. ### Claim 4 (depends on 2) The organic light emitting display device according to claim 2, wherein the shift register comprises a plurality of flip-flops for generating the secondary signals by delaying each of the flip-flops respective input signal by the first period. ### Claim 5 (depends on 4) The organic light emitting display according to claim 4, wherein each of the flip-flops comprises: a first inverter synchronized to a first clock signal for inverting the input signal to output the inverted input signal; a second inverter for inverting an output signal of the first inverter to generate a secondary signal of the plurality of secondary signals; and a third inverter coupled to the second inverter for synchronizing the secondary signal to a second clock signal, and for inverting the secondary signal to output the inverted secondary signal. ### Claim 6 (depends on 5) The organic light emitting display according to claim 5, wherein the first clock signal and the second clock signal are inverted with respect to each other. ### Claim 7 (depends on 6) The organic light emitting display according to claim 6, wherein among the plurality of flip-flops, the first clock signal applied to odd numbered flip-flops and the first clock signal applied to even numbered flip-flops are inverted with respect to each other. ### Claim 8 (depends on 5) The organic light emitting display according to claim 5, wherein the plurality of flip-flops comprise a first flip-flop and a second flip-flop adjacent to the first flip-flop, and the scan driver is configured to output an input signal of the second inverter of the second flip-flop as an emission signal of the emission signals. ### Claim 9 (depends on 8) The organic light emitting display according to claim 8, wherein the scan driver is configured to output a selection signal of the selection signals, the selection signal having a pulse at the second voltage level when an output signal of the first flip-flop and the emission signal of the emission signals are at the first level. ### Claim 10 (depends on 4) The organic light emitting display according to claim 4, wherein the first period is substantially the same as a half period of the first clock signal. ### Claim 11 An organic light emitting display comprising: a plurality of pixel circuits in a matrix; a plurality of first scan lines for transmitting selection signals to select the pixel circuits; a plurality of second scan lines for transmitting emission signals to control a duration of light emission of the pixel circuits; a first driver for sequentially delaying a primary signal having a pulse at a first level by a first period in response to a clock signal to generate secondary signals; a second driver for receiving the secondary signals and third signals, the third signals being inverted signals of the secondary signals, and for outputting the selection signals having a pulse at a second level when the secondary signals and the third signals are at the first level; and a third driver for receiving the plurality of secondary signals and fourth signals, and for outputting the emission signals, the emission signals having a pulse at the second level when the secondary signals and the fourth signals are at the first level. ### Claim 12 (depends on 11) The organic light emitting display according to claim 11, wherein the fourth signals have a pulse at the second level when the level of the clock signal is changed. ### Claim 13 (depends on 11) The organic light emitting display according to claim 11, wherein the first period is substantially the same as a half period of the clock signal. ### Claim 14 An organic light emitting display comprising: a plurality of pixel circuits in a matrix; a plurality of first scan lines for transmitting selection signals to select the pixel circuits; a plurality of second scan lines for transmitting emission signals to control a duration of light emission of the pixel circuits; a first driver for sequentially delaying a primary signal having a pulse at a first level for a first period in response to a first clock signal to generate a plurality of output signals; a second driver for generating third signals having a pulse at a second level when second signals are at the first level, the second signals corresponding to a logical operation of adjacent first and second output signals among the plurality of output signals, and for outputting inverted signals of the second output signals as the emission signals; and a third driver for receiving the third signal, and for changing lateral ends of the pulse at the second level of the third signal into the first level during a predetermined period so as to output a fourth signal as the selection signal. ### Claim 15 (depends on 14) The organic light emitting display according to claim 14, wherein the first period is substantially the same as a half period of the first clock signal. ### Claim 16 (depends on 14) The organic light emitting display according to claim 14, wherein the first driver comprises a plurality of flip-flops having a first inverter synchronized to a second clock signal for inverting an input signal, a second inverter for inverting an output of the first inverter to output an output signal of the plurality of output signals, and a third inverter coupled to the second inverter for synchronizing the output signal to a third clock signal to invert the output signal. ### Claim 17 (depends on 16) The organic light emitting display according to claim 16, wherein the second clock signal is applied to odd numbered flip-flops among the plurality of flip-flops and is substantially the same as the first clock signal, and the third clock signal is an inverted signal of the first clock signal. ### Claim 18 (depends on 17) The organic light emitting display according to claim 17, wherein the second clock signal applied to even numbered flip-flops among the plurality of flip-flops is an inverted signal of the first clock signal, and the third clock signal is substantially the same as the first clock signal. ### Claim 19 (depends on 18) The organic light emitting display according to claim 18, wherein an output of the third inverter is an input of the second inverter. ### Claim 20 (depends on 14) The organic light emitting display according to claim 14, wherein the third driver is further configured to receive a fifth signal alternately having the first level and the second level, and to output the selection signal as a pulse having the second level when the third signal is at the second level and the fifth signal is at the first level. ### Claim 21 (depends on 20) The organic light emitting display according to claim 20, wherein the fifth signal has a pulse at the second level when the level of the first signal is changed. ### Claim 22 A method of driving an organic light emitting display having a plurality of first scan lines for transmitting a plurality of selection signals and a plurality of second scan lines for transmitting a plurality of emission signals, the method comprising: sequentially delaying a primary signal having a first level pulse by a first period to generate a plurality of secondary signals; inverting the secondary signals to output as the emission signals; and outputting a selection signal of the plurality of selection signals having a second level pulse when a secondary signal of the plurality of secondary signals and an emission signal of the plurality of emission signals are at the first level. ### Claim 23 (depends on 22) The method according to claim 22, wherein a width of the selection signal is substantially the same as the first period. ### Claim 24 A method of driving a light emission display having a plurality of first scan lines for transmitting a selection signal and a plurality of second scan lines for transmitting an emission signal, the method comprising: synchronizing a primary signal having a first-level signal to a clock signal and sequentially delaying the synchronized signal by a first period to generate a plurality of secondary signals; inverting the secondary signals to generate a third signal having a second-level pulse; changing the lateral ends of the second level pulse of the third signal into the first level during a predetermined period so as to output the emission signal; and outputting the selection signal having the second-level pulse when the secondary signal and the emission signal are at the first level. ### Claim 25 (depends on 24) The method according to claim 24, wherein the first period is substantially the same as a half period of the clock signal. ### Claim 26 A method of driving an organic light emitting display having a plurality of first scan lines for transmitting a selection signal and a plurality of second scan lines for transmitting an emission signal, the method comprising: sequentially delaying a primary signal having a first level pulse by a first period to generate a plurality of secondary signals; inverting the secondary signals to generate the emission signal; outputting a third signal having a second-level pulse when the primary signal and the emission signal are at the first-level; and changing the lateral ends of the second level pulse of the third signal into the first level during a predetermined period so as to output the selection signal.