# US 12,120,468 B2 · Display apparatus and display system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,468 B2 - Document ID: US12120468B2 - Status: Granted - Kind: B2 - Application number: 17/288,874 - Filed: 2019-09-26 - Published: 2021-11-11 - Granted: 2024-10-15 - Earliest claimed: 2018-10-26 - Assignees: Appotronics Corporation Limited - Applicants: Appotronics Corporation Limited - Inventors: Zuqiang Guo; Peng Du; Yi Li - Web page: https://patentgrep.com/patent/US12120468B2 ## CPC - H04N 9/3114: {by using a sequential colour filter producing one colour at a time} - H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)} - G02B 19/0066: {in the form of an LED array} - G02B 26/0833: {the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD (G02B26/0825 takes precedence; micromechanical devices in general B81B)} - G02B 27/0977: {Reflective elements} - G02B 27/18: for optical projection, e.g. combination of mirror and condenser and objective {(photographic, cine and overhead projectors G03B21/00; photographic projection printing G03B27/32; photolithographic projectors G03F7/20; projection television H04N5/74; colour projection television H04N9/31)} - G03B 21/00: Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) - G03B 21/008: {using micromirror devices} - G03B 21/20: Lamp housings - G03B 21/2033: {LED or laser light sources} - G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)} - G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)} - G03B 21/208: {Homogenising, shaping of the illumination light} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - H04N 9/3164: {using multiple light sources} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 A display apparatus and a display system are provided. The display apparatus includes: a narrow-spectrum light source configured to emit narrow-spectrum light in elliptical distribution; a reflection device including a reflection surface for reflecting the narrow-spectrum light to obtain to-be-modulated light; and a light modulation device configured to modulate the to-be-modulated light to obtain image light of an to-be-modulated image. The light modulation device includes a modulation surface configured to receive the to-be-modulated light, the modulating surface is at a preset angle to an optical axis of the to-be-modulated light such that the to-be-modulated light forms a circle light spot on the modulating surface. The narrow-spectrum light complying with the elliptical distribution is incident onto the light modulation device to form a circle light spot, thereby helping the light modulation device to emit image light in circular angular distribution, improving light effect and achieving better image display quality. ## Claims ### Claim 1 A display apparatus, comprising: a narrowband light source configured to emit narrowband light with an elliptical distribution; a reflection device comprising a reflection surface, wherein the reflection surface is configured to reflect the narrowband light to obtain light to be modulated; and a light modulation device configured to modulate the light to be modulated, to obtain image light of an image to be displayed, wherein the light modulation device comprises a modulating surface configured to receive the light to be modulated, the modulating surface is at a preset angle to an optical axis of the light to be modulated such that the light to be modulated forms a circular light spot on the modulating surface. ### Claim 2 (depends on 1) The display apparatus according to claim 1, wherein the narrowband light source comprises a shaping light source, a convergent lens and a scattering element; wherein the shaping light source is configured to emit a light beam array comprising laser light, the light beam array forms a plurality of discrete first light spots on the convergent lens, the light beam array are converged in a vicinity of the scattering element through the convergent lens, and the scattering element is configured to scatter the converged light beam array to obtain the narrowband light. ### Claim 3 (depends on 2) The display apparatus according to claim 2, wherein the shaping light source comprises: a light emitting array configured to emit a plurality of beams of laser light; a shaping component configured to guide the plurality of beams of laser light to emit along a same optical path to obtain the light beam array, and to adjust an interval of the plurality of first light spots on the convergent lens in a short-axis direction of the elliptical distribution, such that a size of an overall profile of the plurality of first light spots in the short-axis direction is smaller than or equal to a size of the overall profile of the plurality of first light spots in a long-axis direction of the elliptical distribution. ### Claim 4 (depends on 3) The display apparatus according to claim 3, wherein the scattering element is a micro-lens array or an elliptical Gaussian scattering sheet; and the scattering element is configured to perform homogenization on the light beam array and adjust an angle distribution of the light beam array to an elliptical distribution, to obtain the narrowband light. ### Claim 5 (depends on 3) The display apparatus according to claim 3, wherein the light emitting array comprises a first array configured to emit a plurality of beams of first light, wherein the first light comprises laser light; and wherein the shaping component comprises a first mirror group, the first mirror group comprises a plurality of first mirrors in a stepped arrangement, the plurality of first mirrors is in a one-to-one correspondence with the plurality of beams of first light, and each of the plurality of beams of first light is reflected to the convergent lens through a corresponding first reflection mirror. ### Claim 6 (depends on 5) The display apparatus according to claim 5, wherein an interval between adjacent beams of first light and an interval between adjacent first reflection mirrors are adjustable; and by adjusting the interval between adjacent beams of first light and the interval between adjacent first reflection mirrors, an interval of the plurality of first light spots on the convergent lens in the short-axis direction is adjusted. ### Claim 7 (depends on 5) The display apparatus according to claim 5, wherein the light emitting array further comprises a second array configured to emit a plurality of beams of second light, and the second light comprises laser light; wherein the shaping component further comprises: a first polarization state conversion element configured to perform polarization state conversion on the plurality of beams of first light emitted from the first mirror group; a first polarization light-combining component comprising a plurality of first polarization light-combining elements in a stepped arrangement, wherein the plurality of first polarization light-combining elements is in a one-to-one correspondence with the plurality of beams of second light emitted from the second array, each of the plurality of first polarization light-combining elements is configured to guide and combine by polarization one of the plurality of beams of second light with one of the plurality of beams of first light emitted from the first polarization state conversion element, to obtain the light beam array for irradiating the convergent lens. ### Claim 8 (depends on 5) The display apparatus according to claim 5, wherein the light emitting array further comprises a second array configured to emit a plurality of beams of second light, and a third array configured to emit a plurality of beams of third light, wherein the second light and the third light are both laser light; after each of the plurality of beams of the first light, the second light and the third light is reflected by a corresponding one of the first mirror group, optical axes of the plurality of beams of first light, the plurality of beams of second light and the plurality of beams of third light are arranged successively along the long-axis direction; and the shaping component further comprises a second mirror group comprising a plurality of second reflection mirrors, wherein after at least one beam of third light emitted from the first reflection mirror is reflected by a corresponding second reflection mirror, an optical axis of the third light emitted from the corresponding second reflection mirror is located between optical axes of the first light and the second light emitted from the first mirror group in the long-axis direction; and the plurality of beams of first light and the plurality of beams of second light emitted from the first mirror group, and the at least one beam of third light emitted from the second mirror group are emitted along a same direction, to obtain the light beam array. ### Claim 9 (depends on 8) The display apparatus according to claim 8, wherein an optical axis of the plurality of beams of first light emitted from the first mirror group is a first optical axis, an optical axis of the plurality of beams of second light emitted from the first mirror group is a second optical axis, and an optical axis of the plurality of beams of third light emitted from the first mirror group is a third optical axis, wherein in the long-axis direction, a distance between the second optical axis and the first optical axis is larger than a distance between the second optical axis and the third optical axis. ### Claim 10 (depends on 8) The display apparatus according to claim 8, wherein an interval between adjacent second reflection mirrors is adjustable, wherein by adjusting the interval between adjacent second reflection mirrors, an interval of the plurality of first light spots on the convergent lens in the long-axis direction is adjusted. ### Claim 11 (depends on 3) The display apparatus according to claim 3, wherein the light emitting array comprises: a first array configured to emit a plurality of beams of first light, the first light being laser light; and a second array configured to emit a plurality of beams of second light, the second light being laser light, wherein the shaping component comprises: a first light-combining element configured to combine the plurality of beams of first light and the plurality of beams of second light, to obtain the light beam array for irradiating the convergent lens. ### Claim 12 (depends on 11) The display apparatus according to claim 11, wherein the first light-combining element comprises a film-coated area and a non-film-coated area, wherein the plurality of beams of first light are directed to the film-coated area, and the plurality of beams of second light are directed to the non-film-coated area, the film-coated area and the non-film-coated area are configured to guide the plurality of beams of first light and the plurality of beams of second light to exit along a same light path, to obtain the light beam array. ### Claim 13 (depends on 12) The display apparatus according to claim 12, wherein an interval between adjacent film-coated areas is adjustable; and by adjusting the interval between adjacent film-coated areas, an interval of the plurality of first light spots on the convergent lens in the short-axis direction is adjusted. ### Claim 14 (depends on 11) The display apparatus according to claim 11, wherein the light emitting array comprises: a third array configured to emit a plurality of beams of third light, the third light being laser light; and a fourth array configured to emit a plurality of beams of fourth light, the fourth light being laser light, wherein the first light, the second light, the third light and the fourth light are light with a first polarization state; wherein the shaping component further comprises: a second light-combining element configured to guide and combine the plurality of beams of third light with the plurality of beams of fourth light; a second polarization state conversion element configured to convert light with the first polarization state emitted from the second light-combining element into light with a second polarization state; and a second polarization light-combining component configured to guide and combine by polarization the light with the first polarization state emitted from the first light-combining element with the light with the second polarization state emitted from the second polarization state conversion element, to obtain the light beam array. ### Claim 15 (depends on 2) The display apparatus according to claim 2, wherein the scattering element is a micro-lens array or an elliptical Gaussian scattering sheet; and the scattering element is configured to perform homogenization on the light beam array, and to adjust an angle distribution of the light beam array to an elliptical distribution, so as to obtain the narrowband light. ### Claim 16 A display system, comprising a wideband light source and a display apparatus, wherein the display apparatus comprises: a narrowband light source configured to emit narrowband light with an elliptical distribution; a reflection device comprising a reflection surface, wherein the reflection surface is configured to reflect the narrowband light to obtain light to be modulated; and a light modulation device configured to modulate the light to be modulated, to obtain image light of an image to be displayed, wherein the light modulation device comprises a modulating surface configured to receive the light to be modulated, the modulating surface is at a preset angle to an optical axis of the light to be modulated such that the light to be modulated forms a circular light spot on the modulating surface, and wherein the wideband light source is configured to emit wideband light for modulation for an image in a first color gamut, and the narrowband light emitted from the narrowband light source is used for modulation for an image in a second color gamut, wherein the second color gamut covers the first color gamut and the second color gamut has a part beyond the first color gamut, and the wideband light and the narrowband light are combined by etendue to irradiate the reflection device. ### Claim 17 (depends on 16) The display system according to claim 16, wherein the wideband light source further comprises a reflection mirror, wherein the narrowband light emitted from the scattering element in the narrowband light source converges in a vicinity of the reflection mirror, the wideband light is in an out-of-focus state at the reflection mirror, and the wideband light and the narrowband light are combined by etendue at the reflection mirror. ### Claim 18 (depends on 16) The display system according to claim 16, wherein the narrowband light source comprises a shaping light source, a convergent lens and a scattering element; wherein the shaping light source is configured to emit a light beam array comprising laser light, the light beam array forms a plurality of discrete first light spots on the convergent lens, the light beam array are converged in a vicinity of the scattering element through the convergent lens, and the scattering element is configured to scatter the converged light beam array to obtain the narrowband light. ### Claim 19 (depends on 18) The display system according to claim 18, wherein the shaping light source comprises: a light emitting array configured to emit a plurality of beams of laser light; a shaping component configured to guide the plurality of beams of laser light to emit along a same optical path to obtain the light beam array, and to adjust an interval of the plurality of first light spots on the convergent lens in a short-axis direction of the elliptical distribution, such that a size of an overall profile of the plurality of first light spots in the short-axis direction is smaller than or equal to a size of the overall profile of the plurality of first light spots in a long-axis direction of the elliptical distribution. ### Claim 20 A display apparatus, comprising: a narrowband light source configured to emit narrowband light with an elliptical distribution; a reflection device comprising a reflection surface, wherein the reflection surface is configured to reflect the narrowband light to obtain light to be modulated; and a light modulation device configured to modulate the light to be modulated, to obtain image light of an image to be displayed, wherein the light modulation device comprises a modulating surface configured to receive the light to be modulated, the modulating surface is at a preset angle to an optical axis of the light to be modulated such that the light to be modulated forms a circular light spot on the modulating surface, wherein the light to be modulated from the reflection surface is directly incident on the modulating surface.