# US 2019/0318688 A1 · Display unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0318688 A1 - Document ID: US20190318688A1 - Status: Published application - Kind: A1 - Application number: 16/245,182 - Filed: 2019-01-10 - Published: 2019-10-17 - Earliest claimed: 2018-04-17 - Assignees: Joled Inc. - Applicants: Joled Inc. - Inventors: Masahiko KONDO; Jiro YAMADA; Atsuhito MURAI; Yasuhiro TERAI; Noriteru MAEDA - Web page: https://patentgrep.com/patent/US20190318688A1 ## CPC - G02F 1/0126: {Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass} - G02B 6/0066: {characterised by the light source being coupled to the light guide} - G09G 3/3225: using an active matrix - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H10K 59/50: OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - G02F 2201/086: UV absorbing - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2320/066: for control of contrast - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display unit includes a display panel, a photochromic layer, and an ultraviolet absorption layer. The photochromic layer is configured to be colored by ultraviolet light and be decolored or color-faded by visible light. The display panel includes an image display surface with a plurality of pixels. The pixels are provided below the image display surface and each include an organic light-emitting layer. ## Claims ### Claim 1 A display unit comprising: a display panel including an image display surface with a plurality of pixels, the pixels being provided below the image display surface and each including an organic light-emitting layer; a photochromic layer configured to be colored by ultraviolet light and be decolored or color-faded by visible light; and an ultraviolet absorption layer. ### Claim 2 (depends on 1) The display unit according to claim 1, wherein the photochromic layer and the ultraviolet absorption layer are provided in this order on side opposite to the image display surface as viewed from the organic light-emitting layer. ### Claim 3 (depends on 1) The display unit according to claim 1, wherein the organic light-emitting layer includes an organic layer configured to emit light including visible light and ultraviolet light by current application. ### Claim 4 (depends on 1) The display unit according to claim 1, wherein the display panel further includes an ultraviolet light-emitting layer configured to emit ultraviolet light by current application. ### Claim 5 (depends on 4) The display unit according to claim 4, wherein the ultraviolet light-emitting layer is electrically coupled in series to the organic light-emitting layer. ### Claim 6 (depends on 4) The display unit according to claim 4, wherein the pixels each include a first sub-pixel including the organic light-emitting layer and a second sub-pixel including the ultraviolet light-emitting layer. ### Claim 7 (depends on 5) The display unit according to claim 5, wherein the ultraviolet light-emitting layer is provided on side opposite to the image display surface as viewed from the organic light-emitting layer. ### Claim 8 (depends on 1) The display unit according to claim 1, further comprising: a light guide plate provided between the display panel and the photochromic layer; and an ultraviolet light source configured to apply ultraviolet light to an edge of the light guide plate. ### Claim 9 (depends on 1) The display unit according to claim 1, wherein the photochromic layer and the ultraviolet absorption layer are provided in this order on side of the image display surface as viewed from the organic light-emitting layer. ### Claim 10 (depends on 9) The display unit according to claim 9, wherein the display panel further includes an ultraviolet light-emitting layer on the side of the image display surface as viewed from the organic light-emitting layer, the ultraviolet light-emitting layer being configured to emit ultraviolet light by current application. ### Claim 11 (depends on 10) The display unit according to claim 10, further comprising a driver unit configured to drive the display panel, wherein the ultraviolet light-emitting layer is electrically coupled in parallel to the organic light-emitting layer via a switch, and the driver unit controls the switch to perform switching between current application to the organic light-emitting layer and current application to the ultraviolet light-emitting layer. ### Claim 12 (depends on 1) The display unit according to claim 1, wherein the display panel has, in the image display surface, a light-transmissive region through which visible light from behind the display panel is transmitted.