# US 10,311,792 B2 · Expanded gamut electroluminescent displays and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,311,792 B2 - Document ID: US10311792B2 - Status: Granted - Kind: B2 - Application number: 15/221,466 - Filed: 2016-07-27 - Published: 2018-02-01 - Granted: 2019-06-04 - Earliest claimed: 2016-07-27 - Assignees: Landmark Screens, LLC - Applicants: Landmark Screens, LLC - Inventors: Paul O. Scheibe - Web page: https://patentgrep.com/patent/US10311792B2 ## CPC - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)} - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2320/0666: for control of colour parameters, e.g. colour temperature - G09G 2340/06: Colour space transformation - 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 In a display system having pixels made up of electroluminescent devices (ELDs) of three or more basis colors, a control circuit receives for each pixel a specification of a desired color to be displayed on the pixel, and determines a required driving voltage or electrical current for ELDs of each basis color, the required driving voltage or electrical current being determined from values of driving voltages or electrical currents associated with predetermined colors within the spectral locus or the purple line of human vision. ## Claims ### Claim 1 A display system, comprising: a plurality of pixels each including a plurality of electroluminescent devices (ELDs) of three or more basis colors, the basis colors defining a gamut bounded by the spectral locus and the purple line of human vision, wherein the ELDs of each basis color of each pixel, when driven by a voltage or an electrical current, emit light at a luminosity intensity that corresponds to the driving voltage or electrical current; and a control circuit that, for each of the pixels, (i) receives a specification of a specified color to be displayed on the pixel, and (ii) determines for the ELDs of each basis color a required driving voltage or electrical current in a corresponding driver for the ELDs of the pixel to display the specified color, each required driving voltage or electrical current being determined from corresponding values of driving voltages or electrical currents associated with predetermined colors within the gamut and a predetermined dynamic range in luminous intensity, subject to constraints on one or more physical characteristics of the ELDs, the constraints limiting, at different times, different groups of the physical characteristics, wherein the physical characteristics of the ELDs relate to (i) thermal dissipation in the ELD drivers; (ii) luminous intensity dynamic range shaping; (iii) smoothness in electrical responses due to control vector transitions; and (iv) output ranges of driver circuits. ### Claim 2 (depends on 1) The display system of claim 1, wherein the ELDs comprise more than three basis colors such that, for each pixel, more than one set of required driving voltages or electrical currents displays the color for the pixel, and wherein the control circuit selects the set of required driving voltages or electrical currents based on a predetermined consideration. ### Claim 3 (depends on 1) The display system of claim 1, wherein the control circuit uses values of driving voltages or electrical currents that are determined off-line. ### Claim 4 (depends on 1) The display system of claim 1, wherein one of the constraints limits the variation in maximum available luminous intensity. ### Claim 5 (depends on 4) The display system of claim 4, wherein that one of the constraints scale the allowable maximum luminous intensity by a factor between 0.0 and 1.0. ### Claim 6 (depends on 1) The display system of claim 1, further comprising interpolating between the values of driving voltages or electrical currents. ### Claim 7 (depends on 1) The display system of claim 1, wherein when the specified color is outside of the gamut, the control circuit maps the specified color to a substitute color within the gamut. ### Claim 8 (depends on 7) The display system of claim 7, wherein the substitute color lies along a line of approximate constant hue between achromatic point and a color on the spectral locus or the purple line. ### Claim 9 (depends on 1) The display system of claim 1, wherein the required driving voltage or electrical current is scaled from values of driving voltages or electrical currents that yield a predetermined luminous intensity of the specified color. ### Claim 10 (depends on 1) The display system of claim 1, wherein the predetermined colors within the spectral locus or the purple line are sampled in a uniform color space. ### Claim 11 (depends on 1) The display system of claim 1, wherein the predetermined colors are selected based on a predetermined spacing between adjacent ones of the predetermined colors. ### Claim 12 (depends on 11) The display system of claim 11, wherein the predetermined spacing is related to an Euclidean distance calculated in a uniform color space. ### Claim 13 A method carried out in a display system, comprising: providing a plurality of pixels in the display system each including a plurality of electroluminescent devices (ELDs) of three or more basis colors, the basis colors defining a gamut within the spectral locus and the purple line of human vision, wherein the ELDs of each basis color of each pixel, when driven by a voltage or an electrical current, emit light at a luminosity intensity that corresponds to the driving voltage or electrical current; and for each of the pixels, (i) receiving into a control circuit of the display system, a specification of a specified color to be displayed on the pixel; and (ii) for the ELDs of each basis color, determining in the control circuit a required driving voltage or electrical current in a corresponding driver for the ELDs of the pixel to display the specified color, the required driving voltage or electrical current being determined from corresponding values of driving voltages or electrical currents associated with predetermined colors within the gamut and a predetermined dynamic range in luminous intensity, subject to constraints on one or more physical characteristics of the ELDs, the constraints limiting, at different times, different groups of the physical characteristics, wherein the physical characteristics of the ELDs relate to (i) thermal dissipation in the ELD drivers; (ii) luminous intensity dynamic range shaping; (iii) smoothness in electrical responses due to control vector transitions; and (iv) output ranges of driver circuits. ### Claim 14 (depends on 13) The method of claim 13, wherein the ELDs comprise more than three basis colors such that, for each pixel, more than one set of required driving voltages or electrical currents displays the specified color for the pixel, the method further comprising selecting in the control circuit the set of required driving voltages or electrical currents based on a predetermined consideration. ### Claim 15 (depends on 13) The method of claim 13, wherein the values of driving voltages or electrical currents that are determined off-line. ### Claim 16 (depends on 13) The method of claim 13, wherein one of the constraints limits the variation in maximum available luminous intensity. ### Claim 17 (depends on 16) The method of claim 16, wherein that one of the constraints scale the allowable maximum luminous intensity by a factor between 0.0 and 1.0. ### Claim 18 (depends on 13) The method of claim 13, further comprising interpolating between the values of driving voltages or electrical currents are carried out. ### Claim 19 (depends on 9) The method of claim 9, wherein when the specified color is outside of the gamut, the method further comprises mapping the specified color to a substitute color within the gamut. ### Claim 20 (depends on 19) The method of claim 19, wherein the substitute color lies along a line of approximate constant hue between achromatic point and a color on the spectral locus or the purple line. ### Claim 21 (depends on 13) The method of claim 13, wherein the required driving voltage or electrical current is scaled from values of driving voltages or electrical currents that yield a predetermined luminous intensity of the specified color. ### Claim 22 (depends on 13) The method of claim 13, wherein the predetermined colors within the spectral locus or the purple line are sampled in a uniform color space. ### Claim 23 (depends on 13) The method of claim 13, wherein the predetermined colors are selected based on a predetermined spacing between adjacent ones of the predetermined colors. ### Claim 24 (depends on 19) The method of claim 19, wherein the predetermined spacing is related to an Euclidean distance calculated in a uniform color space.