# US 7,411,640 B2 · Image display device and portable terminal device using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,640 B2 - Document ID: US7411640B2 - Status: Granted - Kind: B2 - Application number: 11/870,823 - Filed: 2007-10-11 - Published: 2008-02-14 - Granted: 2008-08-12 - Earliest claimed: 2003-02-28 - Assignees: NEC Corporation - Inventors: Shin-ichi Uehara; Nobuaki Takanashi - Web page: https://patentgrep.com/patent/US7411640B2 ## CPC - G02F 1/133526: {Lenses, e.g. microlenses or Fresnel lenses} - H04N 13/305: using lenticular lenses, e.g. arrangements of cylindrical lenses - H04N 13/307: using fly-eye lenses, e.g. arrangements of circular lenses - G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)} - 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 - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract In a display panel, a plurality of pixel sections are arranged in the form of a matrix. Each of the pixel sections includes a pixel for displaying an image for the left eye and a pixel for displaying an image for the right eye. Lenticular lens having repeated convex surfaces is disposed in front of the display panel to deflect the light emitted from each pixel in the horizontal direction from the pixel for displaying the image for the left eye to the pixel for displaying the image for the right eye in each pixel section. Reflection plate reflects the exterior light toward the display panel and has surface projections on the surface. In this case, the focal distance f of the lens is different from the distance H between the surface of the reflection plate and the apex of the lens. ## Claims ### Claim 1 An image display device comprising: a display panel in which a plurality of pixel sections in the form of a matrix, each pixel section including at least a pixel for displaying an image for a first viewpoint and a pixel for displaying an image for a second viewpoint; a lens disposed in front of the display panel, said lens being constituted by a plurality of lens elements for refracting light emitted from each pixel to output the light in different directions; and a reflection plate disposed in said display panel or in the rear of said display panel, said reflection plate having surface projections on the surface thereof for reflecting the exterior light to said lens; wherein the focal distance f of said lens is the same as the distance H between the surface of said reflection plate and the apex of the lens, and wherein the surface projections on the surface of said reflection plate is designed in such a way that the light entering the three-dimensional image display device is reflected plural times. ### Claim 2 (depends on 1) An image display device according to claim 1, wherein the inclination angle of said surface projection is 50° or more. ### Claim 3 (depends on 1) An image display device according to claim 1, wherein said lens is a lenticular lens. ### Claim 4 (depends on 1) An image display device according to claim 1, wherein said lens is a fly-eye lens. ### Claim 5 (depends on 1) An image display device according to claim 1, wherein said image for said first viewpoint is an image for the left eye and said image for said second viewpoint is an image for the right eye which has a parallax with respect to said image for the right eye to thereby provide a three-dimensional image. ### Claim 6 (depends on 1) An image display device according to claim 1, wherein said display device is a liquid crystal display device. ### Claim 7 (depends on 1) A portable terminal device including a three-dimensional image display device according to claim 1. ### Claim 8 (depends on 7) An image display device according to claim 7, wherein said portable terminal device is a cellular phone, portable terminal, PDA, game machine, digital camera, or digital video camera. ### Claim 9 An image display device comprising: a display panel which has a plurality of pixel sections provided in the form of a matrix, each pixel section including at least a pixel having a transmissive region and a reflective region for displaying an image for a first viewpoint and a pixel having a transmissive region and a reflective region for displaying an image for a second viewpoint; a lens disposed in front of the display panel, said lens being constituted by a plurality of lens elements for refracting light emitted from each pixel to output the light in different directions; a light source illuminating said transmissive region of said display panel with the light; and a reflection plate disposed in the reflective region of said display panel or in the rear of the reflective region of said display panel, said reflection plate having surface projections on the surface thereof for reflecting the exterior light to said lens; wherein a focal distance f of said lens is the same as a distance H between the surface of said reflection plate and the apex of the lens, and wherein the surface projections on the surface of said reflection plate is designed in such a way that the light entering the three-dimensional image display device is reflected plural times. ### Claim 10 (depends on 9) An image display device according to claim 9, wherein the inclination angle of said surface projection is 50° or more. ### Claim 11 (depends on 9) An image display device according to claim 9, wherein said lens is a lenticular lens. ### Claim 12 (depends on 9) An image display device according to claim 9, wherein said lens is a fly-eye lens. ### Claim 13 (depends on 9) An image display device according to claim 9, wherein said image for said first viewpoint is an image for the left eye and said image for said second viewpoint is an image for the right eye which has a parallax with respect to said image for the right eye to thereby provide a three-dimensional image. ### Claim 14 (depends on 9) An image display device according to claim 9, wherein said display device is a liquid crystal display device. ### Claim 15 (depends on 9) A portable terminal device including a three-dimensional image display device according to claim 9. ### Claim 16 (depends on 15) An image display device according to claim 15, wherein said portable terminal device is a cellular phone, portable terminal, PDA, game machine, digital camera, or digital video camera. ### Claim 17 An image display device comprising: a display panel which has a plurality of pixel sections provided in the form of a matrix, each pixel section including at least a pixel for displaying an image for a first viewpoint and a pixel for displaying an image for a second viewpoint; a lenticular lens disposed in front of the display panel, said lenticular lens being constituted by a plurality of cylindrical lenses for refracting light emitted from each pixel to output the light in different directions; and a reflection plate disposed in said display panel or in the rear of said display panel, said reflection plate having surface projections on the surface thereof for reflecting exterior light to said lens; wherein a probability of existence of an inclined surface having an inclination angle on said surface projections is uniform in each of said pixels in an array direction of said cylindrical lenses. ### Claim 18 (depends on 17) An image display device according to claim 17, wherein a phase of said surface projections formed in one area of said pixels is shifted from a phase of said surface projections formed in another area of said pixels in said array direction of said cylindrical lenses. ### Claim 19 (depends on 18) An image display device according to claim 18, wherein a shift of said phase is a half the pitch of said surface projections. ### Claim 20 (depends on 17) An image display device according to claim 17, wherein the pitch of said surface projections in a longitudinal direction of said cylindrical lenses is smaller than the pitch of said surface projections in the array direction of said cylindrical lenses. ### Claim 21 (depends on 17) An image display device according to claim 17, wherein said image for said first viewpoint is an image for the left eye and said image for said second viewpoint is an image for the right eye which has a parallax with respect to said image for the right eye to thereby provide a three-dimensional image. ### Claim 22 (depends on 17) An image display device according to claim 17, wherein said display device is a liquid crystal display device. ### Claim 23 (depends on 17) A portable terminal device including a three-dimensional image display device according to claim 17. ### Claim 24 (depends on 23) An image display device according to claim 23, wherein said portable terminal device is a cellular phone, portable terminal, PDA, game machine, digital camera, or digital video camera. ### Claim 25 An image display device comprising: a display panel which has a plurality of pixel sections provided in the form of a matrix, each pixel section including at least a pixel having a transmissive region and a reflective region for displaying an image for a first viewpoint and a pixel having a transmissive region and a reflective region for displaying an image for a second viewpoint; a lenticular lens disposed in front of the display panel, said lens being constituted by a plurality of cylindrical lenses for refracting light emitted from each pixel to output the light in different directions; a light source illuminating the transmissive region of said display panel with the light; and a reflection plate disposed in the reflective region of said display panel or in the rear of the reflective region of said display panel, said reflection plate having surface projections on the surface thereof for reflecting exterior light to said lens; wherein a probability of existence of an inclined surface having an inclination angle on said surface projections is uniform in each of said pixels in an array direction of said cylindrical lenses. ### Claim 26 (depends on 25) An image display device according to claim 25, wherein a phase of said surface projections formed in one area of said pixels is shifted from a phase of said surface projections formed in another area of said pixels in said array direction of said cylindrical lenses. ### Claim 27 (depends on 26) An image display device according to claim 26, wherein a shift of said phase is a half the pitch of said surface projections. ### Claim 28 (depends on 25) An image display device according to claim 25, wherein the pitch of said surface projections in a longitudinal direction of said cylindrical lenses is smaller than the pitch of said surface projections in the array direction of said cylindrical lenses. ### Claim 29 (depends on 25) An image display device according to claim 25, wherein said image for said first viewpoint is an image for the left eye and said image for said second viewpoint is an image for the right eye which has a parallax with respect to said image for the right eye to thereby provide a three-dimensional image. ### Claim 30 (depends on 25) An image display device according to claim 25, wherein said display device is a liquid crystal display device. ### Claim 31 (depends on 25) A portable terminal device including a three-dimensional image display device according to claim 25. ### Claim 32 (depends on 31) An image display device according to claim 31, wherein said portable terminal device is a cellular phone, portable terminal, PDA, game machine, digital camera, or digital video camera.