# US 10,502,891 B2 · Display device and illumination device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,891 B2 - Document ID: US10502891B2 - Status: Granted - Kind: B2 - Application number: 15/502,313 - Filed: 2015-07-08 - Published: 2017-08-10 - Granted: 2019-12-10 - Earliest claimed: 2014-08-28 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Soya Araki; Takao Sumida; Takeshi Yamamoto; Tomoyuki Yoshimatsu - Web page: https://patentgrep.com/patent/US10502891B2 ## CPC - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces} - G02B 6/0043: {provided on the surface of the light guide} - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - G02B 6/0051: {Diffusing sheet or layer} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0065: {Manufacturing aspects; Material aspects} - G02B 6/0085: {Means for removing heat created by the light source from the package} - G02B 6/0093: {Means for protecting the light guide} - G02B 6/0046: {Tapered light guide, e.g. wedge-shaped light guide} - G09F 9/35: being liquid crystals (G09F9/302 takes precedence; liquid crystal materials C09K19/00; {liquid crystal panels comprising a number of electrodes in a single cell per se G02F1/13}) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS ## Abstract A display device includes a display panel and an illumination section that illuminates the display panel. The illumination section includes: a light guide plate having a first surface and a second surface facing each other; a light source facing an end surface of the light guide plate; an adhesive layer formed adjacent to the first surface of the light guide plate and having substantially the same refractive index as a refractive index of the light guide plate; and a light reflection layer bonded to the first surface of the light guide plate with at least the adhesive layer in between. ## Claims ### Claim 1 A display device provided with a display panel and an illumination section that illuminates the display panel, the illumination section comprising: a light guide plate having a first surface and a second surface facing each other, the light guide plate having a light entry section and a light guide section in which the light entry section has a tapered shaped portion that extends from the light guide section and terminates in an end surface; a light source facing and adjacent the end surface of the light entry section of the light guide plate so as to emit light into the tapered shaped portion of the light entry section; an adhesive layer formed adjacent to the first surface of the light guide plate and having substantially the same refractive index as a refractive index of the light guide plate; a light reflection layer bonded to the first surface of the light guide plate with at least the adhesive layer in between; a low refractive index layer between, and provided adjacent to, the adhesive layer and the light reflection layer, such that the low refractive index layer and the adhesive layer are in an integrated stack configuration with the light guide plate and the light reflection layer, and in which the low refractive index layer extends from a surface of the adhesive layer facing the light reflection layer, to form an interface co-extensive with the surface of the adhesive layer; and an optical sheet disposed on the second surface of the light guide plate and including a curved section arranged to abut a corner section of the second surface of the light guide plate. ### Claim 2 (depends on 1) The display device according to claim 1, wherein diffusion dots are formed on the first surface of the light guide plate and the adhesive layer is provided to cover the diffusion dots. ### Claim 3 (depends on 1) The display device according to claim 1, further comprising a light shielding layer on a side of the light reflection layer which is opposite another side of the light reflection layer that faces the display panel. ### Claim 4 (depends on 3) The display device according to claim 3, further comprising a water vapor barrier layer between the light reflection layer and the light shielding layer. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the light reflection layer is provided adjacent to the adhesive layer. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the light guide plate is made of glass. ### Claim 7 (depends on 1) The display device according to claim 1, wherein the display panel is a liquid crystal panel. ### Claim 8 An illumination device, comprising: a light guide plate having a first surface and a second surface facing each other, the light guide plate having a light entry section and a light guide section in which the light entry section has a tapered shaped portion that extends from the light guide section and terminates in an end surface; a light source facing and adjacent the end surface of the light entry section of the light guide plate so as to emit light into the tapered shaped portion of the light entry section; an adhesive layer formed adjacent to the first surface of the light guide plate and having substantially the same refractive index as a refractive index of the light guide plate; a light reflection layer bonded to the first surface of the light guide plate with at least the adhesive layer in between; a low refractive index layer between, and provided adjacent to, the adhesive layer and the light reflection layer, such that the low refractive index layer and the adhesive layer are in an integrated stack configuration with the light guide plate and the light reflection layer, and in which the low refractive index layer extends from a surface of the adhesive layer facing the light reflection layer, to form an interface co-extensive with the surface of the adhesive layer; and an optical sheet disposed on the second surface of the light guide plate and including a curved section arranged to abut a corner section of the second surface of the light guide plate. ### Claim 9 (depends on 1) The display device according to claim 1, wherein the low refractive index layer has a lower refractive index than the refractive index of the adhesive layer. ### Claim 10 (depends on 8) The illumination device according to claim 8, wherein the low refractive index layer has a lower refractive index than the refractive index of the adhesive layer. ### Claim 11 (depends on 1) The display device according to claim 1, wherein diffusion dots are formed on the first surface of the light guide plate. ### Claim 12 (depends on 8) The illumination device according to claim 8, wherein diffusion dots are formed on the first surface of the light guide plate. ### Claim 13 (depends on 1) The display device according to claim 1, wherein the tapered section comprises an inclination angle between the end surface and the light guide section, the inclination angle being dependent on a thickness of the light guide section or a material the light guide section.