# US 2014/0198091 A1 · Organic light emitting display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0198091 A1 - Document ID: US20140198091A1 - Status: Published application - Kind: A1 - Application number: 14/072,918 - Filed: 2013-11-06 - Published: 2014-07-17 - Earliest claimed: 2013-01-17 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Kwang-Suk SHIN; Won-Jun CHOE - Web page: https://patentgrep.com/patent/US20140198091A1 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - 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 2360/16: Calculation or use of calculated indices related to luminance levels in display data - 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 organic light emitting display includes a scan driving unit applying scan signals and light emitting control signals through a plurality of scan lines and light emitting control lines, a data driving unit applying data signals through a plurality of data lines, a power supply supplying an electric power to a plurality of power supply entries, a pixel unit including a plurality of pixels receiving the plurality of scan signals, light emitting control signals, data signals, and the electric power to display an image, the pixel unit being divided into a plurality of regions corresponding to the plurality of power supply entries, and a current limiting circuit using data current values accumulated region by region in the plurality of regions to output current limiting signals for limiting brightness of the pixel unit. ## Claims ### Claim 1 An organic light emitting display, comprising: a scan driving unit applying scan signals and light emitting control signals through a plurality of scan lines and light emitting control lines; a data driving unit applying data signals through a plurality of data lines; a power supply supplying an electric power to a plurality of power supply entries; a pixel unit including a plurality of pixels receiving the plurality of scan signals, light emitting control signals, data signals, and the electric power to display an image, the pixel unit being divided into a plurality of regions corresponding to the plurality of power supply entries; and a current limiting circuit using data current values accumulated region by region in the plurality of regions to output current limiting signals for limiting brightness of the pixel unit. ### Claim 2 (depends on 1) The organic light emitting display as claimed in claim 1, wherein the power supply entries are arranged at outer upper and lower sides, outer left and right sides, or outer upper, lower, left, and right sides of the pixel unit. ### Claim 3 (depends on 1) The organic light emitting display as claimed in claim 1, wherein the output current limiting signals are applied to the data driving unit or the scan driving unit. ### Claim 4 (depends on 3) The organic light emitting display as claimed in claim 3, wherein the output current limiting signals are applied to the data driving unit, and the data driving unit performs gamma compensation on data signals to correspond to the current limiting signals and provides gamma-compensated data signals to the pixel unit. ### Claim 5 (depends on 3) The organic light emitting display as claimed in claim 3, wherein the output current limiting signals are applied to the scan driving unit, and the scan driving unit adjusts pulse widths of the light emitting control signals to correspond to the current limiting signals. ### Claim 6 (depends on 1) The organic light emitting display as claimed in claim 1, wherein the current limiting circuit includes: a plurality of data current accumulators accumulating data current values for a single frame output from the pixel unit; a plurality of scale factor generators comparing the accumulated data current values respectively output from the data current accumulators with corresponding threshold values to generate corresponding scale factors; a scale factor selector selecting one of the scale factors generated by the scale factor generators; and a current limiting signal generator generating a current limiting signal corresponding to the selected scale factor. ### Claim 7 (depends on 6) The organic light emitting display as claimed in claim 6, wherein the plurality of data current accumulators includes: a global data current accumulator accumulating data current values for a single frame output from the entire pixel unit; and first region to nth region data current accumulators respectively accumulating data current values output for respective single frames region by region in the plurality of regions. ### Claim 8 (depends on 7) The organic light emitting display as claimed in claim 7, wherein the plurality of scale factor generators includes: a global scale factor generator to which accumulated data current values output from the global data current accumulator are applied; and first region to nth region scale factor generators to which accumulated data current values respectively output from the first region to nth region data current accumulators are applied. ### Claim 9 (depends on 6) The organic light emitting display as claimed in claim 6, wherein the scale factors generated by the scale factor generators are values of 0 (zero) to 1 (one). ### Claim 10 (depends on 6) The organic light emitting display as claimed in claim 6, wherein the scale factor selected by the scale factor selector is a minimum scale factor of the generated scale factors.