# US 10,313,644 B2 · Fluorescense wheel, projection light source, projector and its control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,644 B2 - Document ID: US10313644B2 - Status: Granted - Kind: B2 - Application number: 15/677,179 - Filed: 2017-08-15 - Published: 2018-03-15 - Granted: 2019-06-04 - Earliest claimed: 2016-09-13 - Assignees: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd - Inventors: Hui Dong - Web page: https://patentgrep.com/patent/US10313644B2 ## CPC - H04N 9/3111: {for displaying the colours sequentially, e.g. by using sequentially activated light sources (sequential projection in colour photography G03B33/08)} - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - H04N 9/3158: {for controlling the spectrum} - H04N 9/317: {Convergence or focusing systems (electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53)} - H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)} - G03B 21/006: {using LCD's} - G03B 21/008: {using micromirror devices} - G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)} - H04N 9/3164: {using multiple light sources} - H04N 9/3167: {for polarizing the light beam (polarizing optical systems per se G02B27/28)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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) ## Abstract An embodiments of the present disclosure relate to a fluorescence wheel, a projection light source, a projector and its control method. The fluorescent wheel includes a substrate having a reflecting surface; and a fluorescent layer disposed on the reflecting surface of the substrate. The fluorescent layer includes a high color gamut region and a low color gamut region. ## Claims ### Claim 1 A projection light source, comprising: a fluorescent wheel, comprising: a substrate having a reflecting surface; and a fluorescent layer disposed on the reflecting surface of the substrate; wherein the fluorescent layer comprises a high color gamut region and a low color gamut region; a first sub-light source and a second sub-light source disposed opposite to each other and located towards to the reflecting surface of the fluorescent wheel; and a first dichroic mirror disposed between the first sub-light source and the second sub-light source; wherein the first color lights emitted from both of the first sub-light source and the second sub-light source is projected on the first dichroic mirror, and the central axis of the first color light emitted from the first sub-light source coincides with that of the first color light emitted from the second sub-light source; wherein the first color light emitted from the first sub-light source is reflected by first dichroic mirror and projected away from the fluorescent wheel; the second color light emitted from the second sub-light source is reflected by the first dichroic mirror and projected on the fluorescent layer of the fluorescent wheel, the fluorescent layer is excited by the first color light to give out a second color light, which transmits through the first dichroic mirror; the axis of the second color light through the first dichroic mirror and the axis of the first color lights reflected by the first dichroic mirror have a common central axis, and give out a white light when mixed together. ### Claim 2 (depends on 1) The projection light source according to claim 1, further comprising: a group of optical elements for shaping the beam of the white light, which are disposed at a side of the first dichroic mirror far away from the fluorescent wheel, wherein the optical axis of the optical elements coincides with the central axis of the beam of the white light. ### Claim 3 (depends on 1) The projection light source according to claim 1, wherein both of the first sub-light source and the second sub-light source are of blue light. ### Claim 4 (depends on 1) A projector comprising the projection light source according to the claim 1. ### Claim 5 (depends on 4) The projector according to claim 4, further comprising: a first polarizing device, a second dichroic mirror, and a third dichroic mirror, which are all disposed on the light path of the projection light source; wherein the first color light is reflected by the second dichroic mirror, and the second color light is transmitted through the second dichroic mirror, the second color light transmitted through the second dichroic mirror is reflected and transmitted by the third dichroic mirror to form a third color light and a fourth color light, respectively; display elements respectively disposed in light paths of the first color light, the third color light and the fourth color light; and a combining mirror for combining lights emitted from the display elements. ### Claim 6 (depends on 5) The projector according to claim 5, wherein the display element is an LCD chip; and the projector further comprises a second polarizing devices disposed between the combining mirror and each of the display elements, and the polarization direction of the first polarizing device is perpendicular to the polarization direction of the second polarizing device. ### Claim 7 (depends on 5) The projector according to claim 5, wherein the display element is an LCOS chip or a DMD chip; and the projector further comprises a polarizing beam combiner disposed between the combining mirror and each of the display elements; and the polarization direction of the first polarizing device is perpendicular to the polarization direction of the polarizing beam combiner. ### Claim 8 (depends on 5) The projector according to claim 5, wherein the first polarizing device is a polarized-light converter or a polarizing plate. ### Claim 9 A projection light source, comprising: a fluorescent wheel, comprising: a substrate having a reflecting surface; and a fluorescent layer disposed on the reflecting surface of the substrate; wherein the fluorescent layer comprises a high color gamut region and a low color gamut region, the fluorescent layer is disposed near the edge of the substrate and presented in a circle; a first sub-light source and a second sub-light source disposed opposite to each other and located towards to the reflecting surface of the fluorescent wheel; and a first dichroic mirror disposed between the first sub-light source and the second sub-light source; wherein the first color lights emitted from both of the first sub-light source and the second sub-light source is projected on the first dichroic mirror, and the central axis of the first color light emitted from the first sub-light source coincides with that of the first color light emitted from the second sub-light source; wherein the first color light emitted from the first sub-light source is reflected by first dichroic mirror and projected away from the fluorescent wheel; the second color light emitted from the second sub-light source is reflected by the first dichroic mirror and projected on the fluorescent layer of the fluorescent wheel, the fluorescent layer is excited by the first color light to give out a second color light, which transmits through the first dichroic mirror; the axis of the second color light through the first dichroic mirror and the axis of the first color lights reflected by the first dichroic mirror have a common central axis, and give out a white light when mixed together. ### Claim 10 (depends on 9) The projection light source according to claim 9, wherein both of the first sub-light source and the second sub-light source are of blue light. ### Claim 11 (depends on 9) A projector comprising the projection light source according to the claim 9. ### Claim 12 (depends on 11) The projector according to claim 11, wherein further comprising: a first polarizing device, a second dichroic mirror, and a third dichroic mirror, which are all disposed on the light path of the projection light source; wherein the first color light is reflected by the second dichroic mirror, and the second color light is transmitted through the second dichroic mirror, the second color light transmitted through the second dichroic mirror is reflected and transmitted by the third dichroic mirror to form a third color light and a fourth color light, respectively; display elements respectively disposed in light paths of the first color light, the third color light and the fourth color light; and a combining mirror for combining lights emitted from the display elements. ### Claim 13 (depends on 12) The projector according to claim 12, wherein the display element is an LCD chip; and the projector further comprises a second polarizing devices disposed between the combining mirror and each of the display elements, and the polarization direction of the first polarizing device is perpendicular to the polarization direction of the second polarizing device. ### Claim 14 (depends on 12) The projector according to claim 12, wherein the display element is an LCOS chip or a DMD chip; and the projector further comprises a polarizing beam combiner disposed between the combining mirror and each of the display elements; and the polarization direction of the first polarizing device is perpendicular to the polarization direction of the polarizing beam combiner. ### Claim 15 A method for controlling a projector wherein the projector comprises a projection light source comprising: a fluorescent wheel, having a substrate having a reflecting surface; and a fluorescent layer disposed on the reflecting surface of the substrate; wherein the fluorescent layer comprises a high color gamut region and a low color gamut region; a first sub-light source and a second sub-light source disposed opposite to each other and located towards to the reflecting surface of the fluorescent wheel; a first dichroic mirror disposed between the first sub-light source and the second sub-light source; wherein the first color lights emitted from both of the first sub-light source and the second sub-light source is projected on the first dichroic mirror, and the central axis of the first color light emitted from the first sub-light source coincides with that of the first color light emitted from the second sub-light source; wherein the first color light emitted from the first sub-light source is reflected by first dichroic mirror and projected away from the fluorescent wheel; the second color light emitted from the second sub-light source is reflected by the first dichroic mirror and projected on the fluorescent layer of the fluorescent wheel, the fluorescent layer is excited by the first color light to give out a second color light, which transmits through the first dichroic mirror; the axis of the second color light through the first dichroic mirror and the axis of the first color lights reflected by the first dichroic mirror have a common central axis, and give out a white light when mixed together; wherein the projector further comprises: a first polarizing device, a second dichroic mirror, and a third dichroic mirror, which are all disposed on the light path of the projection light source; wherein the first color light is reflected by the second dichroic mirror, and the second color light is transmitted through the second dichroic mirror, the second color light transmitted through the second dichroic mirror is reflected and transmitted by the third dichroic mirror to form a third color light and a fourth color light, respectively; display elements respectively disposed in light paths of the first color light, the third color light and the fourth color light; and a combining mirror for combining lights emitted from the display elements, the method comprising the following steps: during the first frame, controlling the fluorescent wheel to rotate so that the light emitted from the first sub-light source or the second sub-light source of the projection light source is projected on the high color gamut region of the fluorescent wheel, and controlling sub-pixels in a first area of the display element to display; during the second frame, controlling the fluorescent wheel to rotate so that the light emitted from the first sub-light source or the second sub-light source of the projection light source is projected on the low color gamut region of the fluorescent wheel, and controlling sub-pixels in a second area of the display element to display; combining the first frame and the second frame into one picture. ### Claim 16 (depends on 15) The control method according to claim 15, wherein the rotational speed of the fluorescent wheel is greater than 50 revolutions per second.