# US 2013/0278147 A1 · Display device and means to measure and isolate the ambient light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278147 A1 - Document ID: US20130278147A1 - Status: Published application - Kind: A1 - Application number: 13/977,761 - Filed: 2012-01-02 - Published: 2013-10-24 - Earliest claimed: 2010-12-31 - Assignees: Barco N.V. - Inventors: Arnout Robert Leontine Vetsuypens; Olivier Jacques Achille Charlier; Wouter M.F. Woestenborghs - Web page: https://patentgrep.com/patent/US20130278147A1 ## CPC - G09G 5/10: Intensity circuits - G02F 1/133602: {Direct backlight} - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - G02F 2201/58: Arrangements comprising a monitoring photodetector - G09G 5/026: {Control of mixing and/or overlay of colours in general (G09G5/022 and G09G5/024 take precedence)} - G09G 2320/066: for control of contrast - G09G 2360/144: the light being ambient light - G09G 2360/145: the light originating from the display screen - G09G 2380/08: Biomedical applications - 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) - 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 ## Abstract A display method and display device are described having at least one sensor for detecting a property of light such as the intensity, color and/or color point of light emitted from at least one display area of a display device into a viewing angle of the display device and to measure and isolate the contributions of ambient light. An advantage of the sensor system is that it can be used for real-time measurements, e.g. while the display device is in use, and off-line, e.g. when the normal display functionality is interrupted, with a high signal to noise ratio and simultaneously can isolate the contributions of the signals from the backlight of the display device and the signals from the ambient light. ## Claims ### Claim at position 1 1-29. (canceled) ### Claim 30 A display device, comprising: at least one display area provided with a plurality of pixels, each display area comprising: a first transparent or partially transparent sensor for detecting a property of light emitted from the display area into a viewing angle of the display device as well as ambient light, the transparent or partially transparent sensor being located in a front section of said display device in front of said display area; and a filter for use with the first transparent or partially transparent sensor in determining the contribution of the ambient light to the output signal of the sensors or for use with the first transparent or partially transparent sensor in determining the luminance of the ambient light. ### Claim 31 (depends on 30) The display device according to claim 30, wherein the filter is an ambient light absorbing filter. ### Claim 32 (depends on 30) The display device according to claim 30, wherein the filter is a display light absorbing filter. ### Claim 33 (depends on 30) The display device according to claim 30, comprising partially transparent sensors located in a front section of said display device in front of said display area. ### Claim 34 (depends on 33) The display device according to claim 33, where the filter covers the first or second partially transparent sensors. ### Claim 35 (depends on 30) The display device according to claim 30, where a first and a second light coupling devices bring light from the display area to the first and/or second sensors respectively. ### Claim 36 (depends on 35) The display device according to claim 35, where the filter covers all or part of one of the first and second light coupling devices. ### Claim 37 (depends on 30) The display device according to claim 30, wherein the filter is provided by a second sensor for detecting polarized light from the said display area into a viewing angle of the display device, which sensor is located in a front section of said display device in front of said display area. ### Claim 38 (depends on 30) The display device according to claim 30, wherein the filter is for filtering a modulation of the light emitted from the display. ### Claim 39 (depends on 38) The display device according to claim 38, wherein the modulation of the light emitted from the display is realized by blinking the backlight. ### Claim 40 (depends on 30) The display device according to claim 30, wherein the filter is an ambient light blocking filter. ### Claim 41 (depends on 30) The display device according to claim 30, further comprising an analytical means for deriving the ambient light intensity from at least the output of the first sensor. ### Claim 42 (depends on 30) The display device according to claim 30, wherein the sensor comprises a photoconductive sensor. ### Claim 43 (depends on 30) The display device according to claim 30, further comprising at least partially transparent electrical conductors for conducting a measurement signal from said sensor within said viewing angle for transmission to a controller. ### Claim 44 (depends on 43) The display device according to claim 43, wherein the at least partially transparent electrodes comprise an electrically conductive oxide. ### Claim 45 (depends on 30) The display device according to claim 30, wherein the sensor is a bilayer structure with an exciton generation layer and a charge transport layer, said charge transport layer being in contact with a first and a second electrode. ### Claim 46 (depends on 30) The display device according to claim 30, comprising an at least partially transparent optical coupling device located in a front section of said display device and comprising a light guide member for guiding at least one part of the light emitted from the said display area to the corresponding sensor, wherein said coupling device further comprises an incoupling member for coupling the light into the light guide member. ### Claim 47 (depends on 46) The display device according to claim 46, wherein the light guide member is running in a plane which is parallel to a front surface of the display device and wherein the incoupling member is for laterally coupling the light into the light guide member of the coupling device. ### Claim 48 (depends on 46) The display device according to claim 46, wherein the light guide member is provided with a spherical or rectangular cross-sectional shape when viewed in a plane normal to the front surface and normal to a main extension of the light guide member. ### Claim 49 (depends on 46) The display device according to claim 46, wherein the incoupling member is cone-shaped. ### Claim 50 (depends on 49) The display device according to claim 49, wherein the incoupling member is formed as a laterally prominent incoupling member, which is delimited by two laterally coaxial aligned cones, said cones having a mutual apex and different apex angles. ### Claim 51 (depends on 46) The display device according to claim 46, wherein the incoupling member is a diffraction grating. ### Claim 52 (depends on 46) The display device according to claim 46, wherein the incoupling member further transforms a wavelength of light emitted from the display area into a sensing wavelength. ### Claim 53 (depends on 52) The display device according to claim 52, wherein the sensing wavelength is in the infrared range, particularly between 0.7 and 3 micrometers. ### Claim 54 (depends on 52) The display device according to claim 52, wherein the incoupling member is provided with a phosphor for said transformation. ### Claim 55 (depends on 46) The display device according to claim 46, wherein the coupling device is part of a cover member having an inner face and an outer face opposed to the inner face, said inner face facing the at least one display area, wherein the coupling device is present at the inner face. ### Claim 56 (depends on 30) The display device according to claim 30, wherein the display device simultaneously displays an image and senses a light property in the at least one display area. ### Claim 57 (depends on 56) The display device according to claim 56, wherein the light property is the luminance and wherein color measurements are sensed by the at least one sensor of the display device in a calibration mode. ### Claim 58 (depends on 56) The display device according to claim 56, wherein the light property is the ambient light and wherein color measurements are sensed by the at least one sensor of the display device in a real-time mode.