# US 8,542,408 B2 · High dynamic range display systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,408 B2 - Document ID: US8542408B2 - Status: Granted - Kind: B2 - Application number: 11/617,872 - Filed: 2006-12-29 - Published: 2008-07-03 - Granted: 2013-09-24 - Earliest claimed: 2006-12-29 - Assignees: Texas Instruments Incorporated - Applicants: David Foster Lieb; Andrew Ian Russell - Inventors: David Foster Lieb; Andrew Ian Russell - Web page: https://patentgrep.com/patent/US8542408B2 ## CPC - G03B 21/005: {Projectors using an electronic spatial light modulator but not peculiar thereto} - G09G 5/02: characterised by the way in which colour is displayed {(details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607)} - G03B 21/26: Projecting separately subsidiary matter simultaneously with main image - G09G 3/007: {Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels} - G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix} - H04N 9/3126: {for spatial light modulators in series} - G09G 3/2044: {using dithering} - G09G 3/346: {based on modulation of the reflection angle, e.g. micromirrors (micromirrors devices per se G02B26/0833)} - G09G 2300/023: Display panel composed of stacked panels - 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) - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A display system and method of producing images with high dynamic range are provided. The display system employs multiple light valves for projecting a portion of the image onto another. ## Claims ### Claim 1 A method for producing an image from image data for an image to be displayed, comprising: directing a beam of light onto an illumination light valve comprising a first array of individually addressable pixel elements; modulating the beam of light by the first pixel element array using the image data; directing the modulated beam from the first pixel element array to form a blurred defocused image on an imaging light valve comprising a second array of individually addressable pixel elements; modulating light of the blurred image by the second pixel element array using the image data; and projecting the modulated light of the blurred defocused image from the second pixel element array onto a screen; whereby pixel elements of the illumination light valve provide illumination light for modulation by the imaging light valve having intensity variations, with highest and lowest intensities of the illumination light directed in general spatial correspondence onto pixel elements of the imaging light valve that image highest and lowest luminance parts of a scene of the image to be displayed. ### Claim 2 (depends on 1) The method of claim 1, wherein directing the modulated beam from the first pixel element array to form a blurred defocused image comprises modulating the beam of light by the first pixel array using a dither pattern. ### Claim 3 (depends on 1) The method of claim 1, wherein the beam of light is modulated using the image data with an image process that comprises a low frequency pass filtering. ### Claim 4 (depends on 1) The method of claim 1, wherein the beam of light is modulated using the image data with an image process that comprises an image dilation process. ### Claim 5 (depends on 1) The method of claim 1, wherein the pixel elements of the lights valve operate at an ON and OFF state. ### Claim 6 (depends on 5) The method of claim 5, wherein the pixel elements are micromirror devices, or LCD cells. ### Claim 7 (depends on 1) The method of claim 1, wherein the pixel elements are analogue devices. ### Claim 8 (depends on 1) The method of claim 1, wherein the locations of pixel elements of the first pixel element array are optically spatially shifted by a distance from locations of corresponding pixel elements of the second pixel element array. ### Claim 9 (depends on 8) The method of claim 8, wherein the locations of pixel elements of the first pixel element array are shifted by a distance equal to half a diagonal distance of pixel elements of the second pixel element array. ### Claim 10 A method for producing an image from image data for an image to be displayed, comprising: directing a beam of light onto a first digital micromirror device comprising a first array of individually addressable pixel micromirror elements; modulating the beam of light by the first array using the image data; directing the modulated beam from the first array to form a blurred defocused image on a second digital micromirror device comprising a second array of individually addressable pixel micromirror elements, the first array modulating the beam of light using a dither pattern to form an image grayscale light intensity distribution across the second array; modulating light of the blurred image by the second array using the image data; and projecting the modulated light of the blurred defocused image from the second array onto a screen; whereby pixel elements of the first digital micromirror device provide illumination light for modulation by the imaging light valve having intensity variations, with highest and lowest intensities of the illumination light directed in general spatial correspondence onto pixel elements of the second digital micromirror device that image highest and lowest luminance parts of a scene of the image to be displayed.