# US 8,570,314 B2 · Emissive type display device, semiconductor device, electronic device, and power supply line driving method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,314 B2 - Document ID: US8570314B2 - Status: Granted - Kind: B2 - Application number: 12/591,368 - Filed: 2009-11-18 - Published: 2010-06-17 - Granted: 2013-10-29 - Earliest claimed: 2008-12-17 - Assignees: Sony Corporation - Applicants: Hiroshi Hasegawa; Teppei Isobe - Inventors: Hiroshi Hasegawa; Teppei Isobe - Web page: https://patentgrep.com/patent/US8570314B2 ## CPC - G09G 3/3225: using an active matrix - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/0285: using tables for spatial correction of display data - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - G09G 2360/144: the light being ambient light - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - G09G 2360/18: Use of a frame buffer in a display terminal, inclusive of the display panel - 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 An emissive type display device includes: a pixel array section having pixels ready for an active matrix driving system; a circuit for setting a peak luminance level of each display frame; and a driving circuit for variably controlling a total application period length of a driving voltage applied to a power supply line connected to each pixel and amplitude of the driving voltage so as to obtain a set peak luminance level, when the set peak luminance level is lower than a set value, the driving circuit dividing the driving voltage into a plurality of times of pulse waveform, and variably controlling the amplitude of the driving voltage at each output time according to the peak luminance level such that the amplitude of the driving voltage at least one output time is lower than a maximum driving voltage in a non-emission period. ## Claims ### Claim 1 An emissive type display device comprising: a pixel array section having pixels arranged in an active matrix driving system; a circuit configured to provide a set peak luminance level of one frame period; and a driving circuit configured to variably control a total application period length of a driving voltage applied to a power supply line connected to a driving transistor of respective ones of the pixels and amplitude of the driving voltage so as to obtain the set peak luminance level, when the set peak luminance level is lower than a set value, the driving circuit configured to divide the driving voltage into a pulse waveform having a plurality of pulses in the one frame period, and configured to variably control the amplitude of the driving voltage according to the set peak luminance level such that amplitude of at least one of the plurality of pulses is lower than a maximum driving voltage. ### Claim 2 (depends on 1) The emissive type display device according to claim 1, wherein when a plurality of display modes are selectable and a display mode determining section selects one of the plurality of display modes, control by said driving circuit is performed. ### Claim 3 (depends on 2) The emissive type display device according to claim 2, wherein the display mode determining section selects the one of the plurality of display modes when a display frame rate is lower than a determination threshold value. ### Claim 4 (depends on 1) The emissive type display device according to claim 1, the driving circuit controls the amplitude of the plurality of pulses such that the amplitude of the plurality of pulses is decreased gradually towards an end of the one frame period, first one of the plurality of pulses being the maximum driving voltage. ### Claim 5 (depends on 4) The emissive type display device according to claim 4, wherein when the pixel array section is an electro luminescence light emitting device, the maximum driving voltage is a voltage applied at a time of correction of a mobility characteristic. ### Claim 6 (depends on 1) The emissive type display device according to claim 1, wherein widths of the plurality of pulses are all identical to each other. ### Claim 7 (depends on 1) The emissive type display device according to claim 1, wherein the plurality of pulses are disposed at equal intervals in the one frame period. ### Claim 8 (depends on 1) The emissive type display device according to claim 1, wherein a number of the plurality of pulses is set according to a display frame rate. ### Claim 9 (depends on 1) The emissive type display device according to claim 1, wherein the driving voltage is a fixed voltage, which is smaller than the maximum driving voltage, during a non-emission period. ### Claim 10 A semiconductor device comprising: a driving circuit for, in variably controlling a total application period length of a driving voltage applied to a power supply line connected to a driving transistor of each pixel forming a pixel array section and amplitude of the driving voltage so as to obtain a set peak luminance level, when the set peak luminance level is lower than a set value, dividing the driving voltage into a pulse waveform having a plurality of pulses in one frame period, and variably controlling the amplitude of the driving voltage according to the set peak luminance level such that the amplitude of at least one of the plurality of pulses is lower than a maximum driving voltage. ### Claim 11 An electronic device comprising: a pixel array section having pixels ready for an active matrix driving system; a first driving circuit for driving a signal line; a second driving circuit for controlling an operation of writing a potential of said signal line to each pixel forming said pixel array section; a circuit for providing a set peak luminance level of each display frame; a third driving circuit for variably controlling a total application period length of a driving voltage applied to a power supply line connected to a driving transistor of each pixel and amplitude of the driving voltage so as to obtain the set peak luminance level, when the set peak luminance level is lower than a set value, the third driving circuit dividing the driving voltage into a pulse waveform having a plurality of pulses in one frame period, and variably controlling the amplitude of the driving voltage according to the set peak luminance level such that the amplitude of at least one the plurality of pulses is lower than a maximum driving voltage; a system controlling section configured to control operation of an entire system; and an operating input section configured to receive an operating input to said system controlling section. ### Claim 12 A method of driving a power supply line disposed in an emissive type display device, said method comprising: in variably controlling a total application period length of a driving voltage applied to the power supply line connected to a driving transistor of each pixel forming a pixel array section and amplitude of the driving voltage so as to obtain a set peak luminance level, dividing the driving voltage into a pulse waveform having a plurality of pulses in one frame period when the set peak luminance level is lower than a set value; and variably controlling the amplitude of the driving voltage according to the set peak luminance level such that the amplitude of at least one of the plurality of pulses is lower than a maximum driving voltage.