# US 12,183,280 B2 · Means to reduce OLED transient response > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,183,280 B2 - Document ID: US12183280B2 - Status: Granted - Kind: B2 - Application number: 17/845,125 - Filed: 2022-06-21 - Published: 2023-01-12 - Granted: 2024-12-31 - Earliest claimed: 2021-07-01 - Assignees: Universal Display Corporation - Applicants: Universal Display Corporation - Inventors: Michael Hack; Michael Stuart Weaver; Nicholas J. Thompson; Michael O'Connor - Web page: https://patentgrep.com/patent/US12183280B2 ## CPC - G09G 3/3225: using an active matrix - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0417: Special arrangements specific to the use of low carrier mobility technology - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2300/0809: Several active elements per pixel in active matrix panels - G09G 2320/0209: Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0238: Improving the black level - G09G 2320/0252: Improving the response speed - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2320/0626: for control of overall brightness - G09G 2320/064: by time modulation of the brightness of the illumination source - G09G 2330/021: Power management, e.g. power saving - Y02E 10/549: Organic PV cells - 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) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Embodiments of the disclosed subject matter provide a device that includes an organic light emitting device (OLED), and a drive circuit to control the operation of the OLED, comprising a response time accelerator thin film transistor (TFT) configured to short or reverse bias the OLED for a predetermined period of time during a frame time. Other embodiments include an OLED having a plurality of sub-pixels, where one or more of sub-pixels configured to emit light of at least a first color comprises a first emissive area and a second emissive area that are independently controllable, where the first emissive area is larger than the second emissive area. The controller is configured to control the second emissive area to have (i) a higher brightness, and/or (ii) a higher current density than the first emissive area for a first sub-pixel luminance level that is less than a maximum luminance. ## Claims ### Claim 1 A device comprising: an organic light emitting device (OLED) having a plurality of sub-pixels, where one or more sub-pixels of the plurality of sub-pixels comprise: a first emissive area and a second emissive area that are in a same sub-pixel of the one or more sub-pixels and are independently controllable; and a controller to control the first emissive area and the second emissive area, wherein the first emissive area is larger than the second emissive area, and wherein the controller is configured to control the second emissive area to have at least one selected from a group consisting of: (i) a higher brightness, and (ii) a higher current density than the first emissive area for a first sub-pixel luminance level that is less than a maximum luminance, wherein each emissive area in the same sub-pixel is powered by its own power supply line, wherein the first emissive area and the second emissive area are configured to emit the same emissive spectrum, and wherein the emissive spectrum of light emitted out of the device from a sub-pixel is the same whether the light is emitted from the first emissive area or the second emissive area in the sub-pixel. ### Claim 2 (depends on 1) The device of claim 1, further comprising: a plurality of data lines, wherein each emissive area in the same sub-pixel is addressed from a separate data line. ### Claim 3 (depends on 1) The device of claim 1, wherein the first emissive area and the second emissive area form a total emissive area, and wherein the second emissive area is at least one selected from the group consisting of: less than 50% of the total emissive area, less than 25%, of the total emissive area, less than 10% of the total emissive area, and less than 5% of the total emissive area. ### Claim 4 (depends on 1) The device of claim 1, wherein the controller is configured to control the amount of light output by the OLED, and wherein the controller is configured to turn off the first emissive area and emit light from the second emissive area when less than a predetermined amount of the maximum luminance. ### Claim 5 (depends on 1) The device of claim 1, wherein the controller is configured to control the first emissive area and the second emissive area to output light above a first percentage of a maximum sub-pixel luminance, configured to control the second emissive area to output light below a second percentage of the maximum sub-pixel luminance, and configured to control the first emissive area and the second emissive area to output light at different intensities when between the first percentage and second percentage of maximum luminance. ### Claim 6 (depends on 5) The device of claim 5, wherein the first percentage of the maximum sub-pixel luminance is between 10%-100%, and the second percentage of the maximum sub-pixel luminance is 0-50%. ### Claim 7 (depends on 1) The device of claim 1, wherein the controller is configured to control at least one selected from the group consisting of: the first emissive area, and the second emissive area of a sub-pixel to be energized for a portion of a frame time less than a complete frame time. ### Claim 8 (depends on 7) The device of claim 7, further comprising: a separate power line to the OLED, wherein the controller controls to duty cycle to be at least one selected from the group consisting of: a less than 100% duty cycle, a less than 50% duty cycle, a less than 25% duty cycle, a less than 10% duty cycle, and a less than 5% duty cycle. ### Claim 9 (depends on 8) The device of claim 8, wherein at least one selected from the group consisting of: the first emissive area, and the second emissive area is powered by the separate power line having the selected duty cycle. ### Claim 10 (depends on 1) The device of claim 1, wherein the device is at least one type selected from the group consisting of: a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video walls comprising multiple displays tiled together, a theater or stadium screen, and a sign. ### Claim 11 (depends on 1) The device of claim 1, wherein at least one sub-pixel of the plurality of sub-pixels is configured to emit at least one selected from the group consisting of: white light, yellow light, green light, blue light, and cyan light. ### Claim 12 (depends on 1) The device of claim 1, wherein each pixel of the plurality of pixels has at least three sub-pixels, wherein the emissive areas within each of the at least three sub-pixels are independently controllable, wherein the controller is configured to control the second emissive area to have a higher brightness than the first emissive area for a first luminance level that is less than a maximum luminance. ### Claim 13 (depends on 1) The device of claim 1, wherein each emissive layer in the same sub-pixel is deposited at the same time using the same patterning process. ### Claim 14 (depends on 1) The device of claim 1, further comprising: a plurality of scan lines, wherein each emissive area in the same sub-pixel is addressed from a separate scan line of the plurality of scan lines. ### Claim 15 (depends on 1) The device of claim 1, wherein the controller controls a duty cycle of the power supply line to control when the sub-pixel is turned on. ### Claim 16 (depends on 1) The device of claim 1, wherein the second emissive area of the OLED is powered by a voltage supply which is pulsed with a duty cycle less than 100%. ### Claim 17 (depends on 1) The device of claim 1, wherein different colors of light are emitted from the at least two emission areas of at least one selected from a group consisting of: a green sub-pixel, a red sub-pixel, and a blue sub-pixel. ### Claim 18 (depends on 17) The device of claim 17, wherein different colors are formed from at least one selected from the group consisting of: a different microcavity, one or more color altering layers, and quantum dots. ### Claim 19 (depends on 1) The device of claim 1, wherein the first emissive area emits a first light from the device and the second emissive area emits a second light from the device and wherein the first light and the second light are the same emissive spectrum. ### Claim 20 (depends on 1) The device of claim 1, wherein the first emissive area and the second emissive are a same emissive layer deposited via a single deposition.