# US 10,481,398 B2 · Virtual image display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,398 B2 - Document ID: US10481398B2 - Status: Granted - Kind: B2 - Application number: 15/079,884 - Filed: 2016-03-24 - Published: 2016-09-29 - Granted: 2019-11-19 - Earliest claimed: 2015-03-25 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Toshiaki Miyao; Takahiro Totani; Masayuki Takagi; Takashi Takeda; Akira Komatsu; Takeshi Koshihara; Kunihiko Yano - Web page: https://patentgrep.com/patent/US10481398B2 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 27/141: {using dichroic mirrors} - G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract In an image generation unit, a light emitting part is formed using a self-emitting OLED device, and thereby, high-contrast images can be formed and the life of the light emitting part and the life of the virtual image display apparatus are extended. Even when the light emitted in the light emitting part has deviation in color balance, a half-mirror layer that has light transmissivity and realizes see-through vision is a reflection film having wavelength dependence, and thereby, a uniform color balance of image lights is achieved and images in good conditions are visually recognized. ## Claims ### Claim 1 A virtual image display apparatus comprising: an image generator that outputs image light, including: a first emitter emits a first light with a wavelength of 430 nm to 490 nm; a second emitter that emits a second light with a wavelength of 491 nm to 580 nm, a luminance of the second light being higher than a luminance of the first light; and a third emitter that emits a third light with a wavelength of 581 nm to 700 nm, a luminance of the third light being higher than the luminance of the first light; and a reflection film having light transmissivity and having wavelength dependence such that: a reflectance of the first light is higher than a reflectance of the second light; and the reflectance of the first light is higher than a reflectance of the third light. ### Claim 2 (depends on 1) The virtual image display apparatus according to claim 1, wherein at least one of the first, second, and third emitters is a self-emitting device. ### Claim 3 (depends on 2) The virtual image display apparatus according to claim 2, wherein the self-emitting device is an OLED device. ### Claim 4 (depends on 1) The virtual image display apparatus according to claim 1, wherein the reflectance of the first light is 5% to 20% higher than at least one of the reflectance of the second light and the reflectance of the third light. ### Claim 5 (depends on 1) The virtual image display apparatus according to claim 1, wherein the reflection film has pulsed reflection characteristics for at least one of the first light, the second light, and the third light. ### Claim 6 (depends on 1) The virtual image display apparatus according to claim 1, further comprising: a light guide device having: a light guide that guides image light by reflection on an inner surface; and a light transmitter that is bonded to the light guide and allows visual recognition of outside world light and the image light in superimposition, wherein the reflection film forms a reflection surface of the light guide. ### Claim 7 (depends on 6) The virtual image display apparatus according to claim 6, wherein the reflection film is a semi-transmissive reflection film formed on a bonding surface on which the light guide and the light transmitter are bonded in the light guide device. ### Claim 8 (depends on 6) The virtual image display apparatus according to claim 6, further comprising a see-through compensation part having inverse wavelength dependence to the wavelength dependence for transmitted light of the reflection film, provided outside of an optical path of the image light closer to a side of an outside world than the reflection film. ### Claim 9 (depends on 8) The virtual image display apparatus according to claim 8, further comprising: a shade device attached to cover at least a part in front of an eye and having an outside light transmittance adjustment function for improving picture visibility by reducing transmittance of the outside world light, wherein the see-through compensation part is provided in the shade device. ### Claim 10 (depends on 8) The virtual image display apparatus according to claim 8, wherein the see-through compensation part has a size equal to or larger than that of the reflection film. ### Claim 11 (depends on 1) The virtual image display apparatus according to claim 1, wherein the reflection film has higher reflectance in order of light of a blue wavelength range, light of a red wavelength range, and light of a green wavelength range with respect to the image light from the image generator. ### Claim 12 (depends on 1) The virtual image display apparatus according to claim 1, wherein the reflection film includes a dielectric multilayer film. ### Claim 13 (depends on 12) The virtual image display apparatus according to claim 12, wherein the reflection film is formed by stacking a plurality of dielectric multilayer films having reflection characteristics respectively corresponding to each of the first, second, and third light. ### Claim 14 A virtual image display apparatus comprising: an image generator that outputs image light, including: a first emitter emits a first light with a wavelength of 430 nm to 490 nm; a second emitter that emits a second light with a wavelength of 491 nm to 580 nm, a luminance of the second light being higher than a luminance of the first light; and a third emitter that emits a third light with a wavelength of 581 nm to 700 nm, a luminance of the third light being higher than the luminance of the first light; and a reflection film having wavelength dependence and forming a mirror reflection surface at a light-incident side of a light guide that guides the image light from the image generator, the reflection film having wavelength dependence such that: a reflectance of the first light is higher than a reflectance of the second light; and the reflectance of the first light is higher than a reflectance of the third light. ### Claim 15 (depends on 14) The virtual image display apparatus according to claim 14, wherein the reflection film has light absorption characteristics proportional to brightness of light with respect to each of the first, second, and third light.