# US 10,769,988 B2 · Display device configured to measure light and adjust display brightness and a method of driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,769,988 B2 - Document ID: US10769988B2 - Status: Granted - Kind: B2 - Application number: 15/971,811 - Filed: 2018-05-04 - Published: 2019-01-31 - Granted: 2020-09-08 - Earliest claimed: 2017-07-25 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Keumdong Jung - Web page: https://patentgrep.com/patent/US10769988B2 ## CPC - G09G 3/3225: using an active matrix - G03B 21/006: {using LCD's} - G03B 21/10: Projectors with built-in or built-on screen - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G03B 21/56: Projection screens - G03B 21/60: characterised by the nature of the surface - G09G 2320/062: Adjustment of illumination source parameters - G09G 2320/0666: for control of colour parameters, e.g. colour temperature - G09G 2360/142: the light being detected by light detection means within each pixel - G09G 2360/148: the light being detected by light detection means within each pixel - 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) - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A display device includes a screen having a plurality of pixels displaying an image. A projector includes a light source emitting a first light and a light converter configured to change an intensity of the first light with respect to each of the plurality of pixels so that the projector emits a conversion light. Each of the plurality of pixels of the screen includes a light receiving element configured to receive the conversion light and to generate a current proportional to an intensity of the conversion light. A light emitting element is configured to display the image based on the generated current. ## Claims ### Claim 1 A display device comprising: a screen comprising a plurality of pixels displaying an image; and a projector comprising a light source emitting a first light and a light converter configured to change an intensity of the first light so that the projector emits a conversion light including information of the image displayed by each of the plurality of pixels, wherein each of the plurality of pixels of the screen comprises: a light receiving element configured to receive the conversion light from the projector and to generate a current proportional to an intensity of the conversion light within the light receiving element of the screen; and a light emitting element configured to display the image on the screen based on the generated current, wherein the light receiving element is electrically connected to the light emitting element and the current generated by the light receiving element is transmitted to the light emitting element by this electrical connection, and wherein each of the plurality of pixels does not receive data voltages corresponding to the information of the image. ### Claim 2 (depends on 1) The display device of claim 1, wherein the light converter comprises a plurality of optical pixels, wherein each of the plurality of optical pixels is configured to receive the first light and emit the conversion light according to brightness information of the image. ### Claim 3 (depends on 1) The display device of claim 1, further comprising an optical sheet, wherein the screen comprises a first surface configured to display the image and a second surface, opposite to the first surface, wherein the projector is configured to emit the conversion light to the second surface, and the optical sheet is disposed on the second surface. ### Claim 4 (depends on 3) The display device of claim 3, wherein the optical sheet is configured to transmit light having a first wavelength band in which a wavelength of the conversion light is included and is configured to absorb light having a second wavelength band in which the wavelength of the conversion light is not included. ### Claim 5 (depends on 4) The display device of claim 4, wherein the conversion light is an infrared light having the first wavelength band. ### Claim 6 (depends on 1) The display device of claim 1, further comprising an optical sheet, wherein the screen comprises a first surface configured to display the image and a second surface opposite to the first surface, the projector is configured to emit the conversion light to the first surface, and the optical sheet is disposed on the first surface and is configured to absorb a portion of the conversion light traveling to the first surface. ### Claim 7 (depends on 1) The display device of claim 1, further comprising an optical sheet, wherein the screen comprises a first surface configured to display the image and a second surface opposite to the first surface, the projector is configured to emit the conversion light to the second surface, and the optical sheet is disposed on the first surface and is configured to absorb a portion of the conversion light that is transmitted through the screen. ### Claim 8 (depends on 1) The display device of claim 1, wherein the light converter comprises a plurality of optical pixels, wherein each of the plurality of optical pixels is configured to receive the first light and emit the conversion light, and each of the plurality of optical pixels respectively emits a portion of the conversion light to the pixels. ### Claim 9 (depends on 8) The display device of claim 8, wherein a number of the optical pixels is equal to a number of the pixels. ### Claim 10 (depends on 1) The display device of claim 1, wherein the light source comprises a plurality of optical pixels, each of which is configured to emit a portion of the conversion light having different wavelengths from each other, and each of the pixels is configured to selectively receive one of the portions of the conversion light having different wavelengths from each other. ### Claim 11 (depends on 1) The display device of claim 1, wherein the light source comprises a plurality of optical pixels, each of which is configured to sequentially emit a portion of the conversion light having different wavelengths from each other, and the pixels are configured to be sequentially driven in accordance with a sequence of the portions of the conversion light. ### Claim 12 (depends on 11) The display device of claim 11, wherein the plurality of optical pixels comprises a first optical pixel configured to emit the conversion light having a first wavelength, a second optical pixel configured to emit the conversion light having a second wavelength, and a third optical pixel configured to emit the conversion light having a third wavelength, wherein the plurality of pixels comprise a first pixel, a second pixel, and a third pixel, wherein the first pixel is driven by a switch transistor of the first pixel to emit the conversion light having the first wavelength when the first optical pixel emits the conversion light having the first wavelength, wherein the second pixel is driven by a switch transistor of the second pixel to emit the conversion light having the second wavelength when the second optical pixel emits the conversion light having the second wavelength, and wherein the third pixel is driven by a switch transistor of the third pixel to emit the conversion light having the third wavelength when the third optical pixel emits the conversion light having the third wavelength. ### Claim 13 (depends on 1) The display device of claim 1, further comprising a pixel definition layer disposed between the light emitting element of each of the plurality of pixels, wherein the screen comprises a first surface and a second surface, wherein the image is displayed through the first surface, wherein the projector emits the conversion light to the first surface, and wherein the pixel definition layer overlaps the light receiving element. ### Claim 14 (depends on 1) The display device of claim 1, further comprising a pixel definition layer disposed between the light emitting element of each of the plurality of pixels, wherein each of the plurality of pixels further comprises a switch transistor configured to selectively drive the light emitting element, wherein the screen comprises a first surface and a second surface, wherein the image is displayed through the first surface, wherein the projector is configured to emit the conversion light to the second surface, and wherein the pixel definition layer overlaps with the switch transistor. ### Claim 15 (depends on 1) The display device of claim 1, further comprising a pixel definition layer, wherein each of the plurality of pixels further comprises a switch transistor configured to selectively drive the light emitting element, wherein the screen comprises a first surface and a second surface, wherein the image is displayed through the first surface, wherein the projector is configured to emit the conversion light to the first surface, a source electrode or a drain electrode of the switch transistor is electrically connected to the light receiving element through a bridge, and wherein the pixel definition layer overlaps with the light receiving element and the switch transistor. ### Claim 16 (depends on 1) The display device of claim 1, wherein the light source comprises a plurality of optical pixels, a first pixel of the plurality of pixels is driven in a first sub-frame of one frame and receives the conversion light emitted from one optical pixel of the plurality of optical pixels, and a second pixel of the plurality of pixels is driven in a second sub-frame, occurring after the first sub-frame, of the one frame, and is configured to receive the conversion light emitted from the one optical pixel of the plurality of optical pixels. ### Claim 17 (depends on 1) The display device of claim 1, wherein each of the plurality of pixels further comprises an amplifying transistor configured to connect the light receiving element to an amplification power source and to amplify the current generated by the light receiving element. ### Claim 18 (depends on 1) The display device of claim 1, further comprising a power drive unit that provides a direct current power source to each of the plurality of pixels, wherein a value of the current generated by the light receiving element of each of the plurality of pixels is determined by the direct current power source. ### Claim 19 (depends on 1) The display device of claim 1, wherein each of the plurality of pixels further comprises a switch transistor configured to selectively drive the light emitting element. ### Claim 20 (depends on 1) The display device of claim 1, wherein the light source comprises a plurality of optical pixels, wherein the conversion light is a laser beam, and the laser beam emitted from each of the plurality of optical pixels reaches one pixel of the plurality of pixels. ### Claim 21 A display device comprising: a plurality of pixels displaying an image, wherein each of the plurality of pixels comprises: a light receiving element configured to receive an external light and to generate a current proportional to an intensity of the external light; and a light emitting element, electrically connected to the light receiving element, configured to display the image based on the generated current that is transmitted along the electrical connection, wherein the external light includes gray scale information and brightness information of the image, and wherein each of the plurality of pixels does not receive data voltages corresponding to the gray scale information and the brightness information of the image. ### Claim 22 A method of driving a display device, comprising: emitting a first light; changing an intensity of the first light with respect to each of a plurality of optical pixels of the projector, to emit a conversion light comprising gray scale information and brightness information of an image from the projector; emitting the conversion light to each of a plurality of pixels of a screen, the plurality of pixels of the screen corresponding to the plurality of optical pixels of the projector; receiving the conversion light from the projector by a light receiving element of the screen to generate a current proportional to the intensity of the conversion light within the light receiving element of the screen; and displaying the image based on the generated current on the screen by a light emitting element of the screen, wherein the light receiving element is electrically connected to the light emitting element and the current generated by the light receiving element is transmitted to the light emitting element by this electrical connection, and wherein each of the plurality of pixels of the screen does not receive data voltages corresponding to the gray scale information and brightness information of the image.