# US 9,753,198 B2 · Light emitting screen and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,198 B2 - Document ID: US9753198B2 - Status: Granted - Kind: B2 - Application number: 14/837,574 - Filed: 2015-08-27 - Published: 2016-03-17 - Granted: 2017-09-05 - Earliest claimed: 2014-09-16 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Yukito Saitoh; Yujiro Yanai; Akiko Watano; Takashi Yonemoto - Web page: https://patentgrep.com/patent/US9753198B2 ## CPC - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - G02B 5/223: {containing organic substances, e.g. dyes, inks or pigments} - B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract The light emitting screen of the present invention includes: a blue light emitting layer emitting blue light by being excited with first excitation light; a green light emitting layer which is disposed on the blue light emitting layer and emits green light by being excited with second excitation light; a red light emitting layer which is disposed on the green light emitting layer and emits red light by being excited with third excitation light; a first selective reflection layer which is disposed between the blue light emitting layer and the green light emitting layer; and a second selective reflection layer which is disposed between the green light emitting layer and the red light emitting layer, wherein the blue light emitting layer, the green light emitting layer, and the red light emitting layer contain quantum rods or quantum dots. ## Claims ### Claim 1 A light emitting screen comprising: a blue light emitting layer which emits blue light by being excited with first excitation light; a green light emitting layer which is disposed on the blue light emitting layer and emits green light by being excited with second excitation light having a wavelength longer than a wavelength of an absorption edge on a long-wavelength side of an absorption spectrum of the blue light emitting layer; a red light emitting layer which is disposed on the green light emitting layer and emits red light by being excited with third excitation light having a wavelength longer than a wavelength of an absorption edge on a long-wavelength side of an absorption spectrum of the green light emitting layer; a first selective reflection layer which is disposed between the blue light emitting layer and the green light emitting layer and reflects the first excitation light; and a second selective reflection layer which is disposed between the green light emitting layer and the red light emitting layer and reflects the second excitation light, wherein the blue light emitting layer, the green light emitting layer, and the red light emitting layer contain quantum rods or quantum dots. ### Claim 2 (depends on 1) The light emitting screen according to claim 1, further comprising a third selective reflection layer which is disposed on the side of the red light emitting layer that is opposite to the green light emitting layer and reflects the third excitation light. ### Claim 3 (depends on 2) The light emitting screen according to claim 2, wherein the blue light emitting layer, the green light emitting layer, and the red light emitting layer contain quantum rods. ### Claim 4 (depends on 2) The light emitting screen according to claim 2, wherein each of the first selective reflection layer and the second selective reflection layer is one selected from the group consisting of a dielectric multilayer film, a reflection-type polarizer, and a layer in which a cholesteric liquid crystal phase is fixed. ### Claim 5 (depends on 2) A display apparatus comprising: the light emitting screen according to claim 2; and a light source apparatus which emits the first excitation light, the second excitation light, and the third excitation light. ### Claim 6 (depends on 1) The light emitting screen according to claim 1, wherein the blue light emitting layer, the green light emitting layer, and the red light emitting layer contain quantum rods. ### Claim 7 (depends on 6) The light emitting screen according to claim 6, wherein each of the first selective reflection layer and the second selective reflection layer is one selected from the group consisting of a dielectric multilayer film, a reflection-type polarizer, and a layer in which a cholesteric liquid crystal phase is fixed. ### Claim 8 (depends on 6) A display apparatus comprising: the light emitting screen according to claim 6; and a light source apparatus which emits the first excitation light, the second excitation light, and the third excitation light. ### Claim 9 (depends on 1) The light emitting screen according to claim 1, wherein each of the first selective reflection layer and the second selective reflection layer is one selected from the group consisting of a dielectric multilayer film, a reflection-type polarizer, and a layer in which a cholesteric liquid crystal phase is fixed. ### Claim 10 (depends on 9) A display apparatus comprising: the light emitting screen according to claim 9; and a light source apparatus which emits the first excitation light, the second excitation light, and the third excitation light. ### Claim 11 (depends on 1) A display apparatus comprising: the light emitting screen according to claim 1; and a light source apparatus which emits the first excitation light, the second excitation light, and the third excitation light. ### Claim 12 (depends on 11) The display apparatus according to claim 11, wherein the light source apparatus has a first light source emitting the first excitation light, a second light source emitting the second excitation light, and a third light source emitting the third excitation light. ### Claim 13 (depends on 12) The display apparatus according to claim 12, wherein each of the first excitation light, the second excitation light, and the third excitation light is linearly polarized light, and the first selective reflection layer and the second selective reflection layer are reflection-type polarizers. ### Claim 14 (depends on 12) The display apparatus according to claim 12, wherein each of the first excitation light, the second excitation light, and the third excitation light is circularly polarized light, and the first selective reflection layer and the second selective reflection layer are layers in which a cholesteric liquid crystal phase is fixed. ### Claim 15 (depends on 11) The display apparatus according to claim 11, wherein each of the first excitation light, the second excitation light, and the third excitation light is linearly polarized light, and the first selective reflection layer and the second selective reflection layer are reflection-type polarizers. ### Claim 16 (depends on 11) The display apparatus according to claim 11, wherein each of the first excitation light, the second excitation light, and the third excitation light is circularly polarized light, and the first selective reflection layer and the second selective reflection layer are layers in which a cholesteric liquid crystal phase is fixed.