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CN-121978839-A - AR micro-projection color light machine and near-to-eye display device

CN121978839ACN 121978839 ACN121978839 ACN 121978839ACN-121978839-A

Abstract

The application provides an AR micro-projection color light machine and near-to-eye display equipment, and relates to the technical field of AR. The optical machine comprises an imaging lens group, a color combining prism, an image source and a lens assembly, wherein the imaging lens group comprises a diaphragm, a first lens, a second lens, a third lens and three fourth lenses which are sequentially arranged from an object side to an image side along an optical axis, the color combining prism is an X-cube color combining prism and is arranged between the third lens and the fourth lens and used for combining a three-color optical path into one-path color optical path for output, the image source is arranged on the image side of the fourth lens and used for providing an electronic image, the first lens is a positive lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a positive lens, and the second lens and the third lens are cemented lenses. The application can realize full-color display by constructing the optical framework of the lens and the X-cube color combining prism and by the cooperative cooperation of the optical elements, and simultaneously has the advantages of small volume, large field angle, excellent optical effect, high definition and the like.

Inventors

  • ZHANG ZIXUAN
  • LI DE

Assignees

  • 华勤技术股份有限公司

Dates

Publication Date
20260505
Application Date
20260403

Claims (11)

  1. 1. An AR micro-projection color engine, comprising: the imaging lens group is used for imaging the light beam and comprises a diaphragm, a first lens, a second lens, a third lens and three fourth lenses which are sequentially arranged from the object side to the image side along the optical axis; The color combining prism is an X-cube color combining prism and is arranged between the third lens and the fourth lens and used for combining red, green and blue light paths into one-path color light path for output, and An image source disposed on an image side of the fourth lens for providing an electronic image; the first lens is a positive lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a positive lens, and the second lens and the third lens are cemented lenses.
  2. 2. The AR micro-projection color engine of claim 1, further comprising a structural member for supporting and securing the imaging lens group, the color combiner prism, and the image source.
  3. 3. The AR micro-projection color engine according to claim 1 or 2, wherein the optical system F-number of the AR micro-projection color engine is in the range of 1.55 to 1.8.
  4. 4. The AR micro-projection color engine according to claim 1 or 2, wherein the maximum field angle of the optical system of the AR micro-projection color engine is in the range of 29 ° to 31 °.
  5. 5. The AR micro-projection color engine according to claim 1 or 2, wherein the aperture of the diaphragm ranges from 3.2mm to 3.4mm; And/or the distance between the diaphragm and the object side surface of the first lens is 0.05mm to 0.1mm.
  6. 6. The AR micro-projection color engine according to claim 1 or 2, wherein the total length L of the imaging lens group is 7 mm≤l≤8.5 mm.
  7. 7. The AR micro-projection color engine of claim 1 or 2, wherein the imaging lens group has an operating wavelength covering 465nm±20nm, 530nm±20nm, and 620nm±20nm.
  8. 8. The AR micro-projection color light engine according to claim 1 or 2, wherein the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy the following relations of 6mm < f1<8mm,3.5mm < f2<4.5mm, -2.5mm < f3< -1.5mm,6mm < f4<8mm.
  9. 9. The AR micro-projection color engine of claim 1 or 2, wherein at least one of the first lens, the second lens, the third lens and the fourth lens has a refractive index greater than 1.8.
  10. 10. The AR micro-projection color engine of claim 1 or 2, wherein the image source is a micro light emitting diode display chip or a liquid crystal on silicon display chip.
  11. 11. A near-eye display device comprising an AR micro-projection color engine as claimed in any one of claims 1 to 10.

Description

AR micro-projection color light machine and near-to-eye display device Technical Field The application relates to the technical field of augmented reality (Augmented Reality, AR for short), in particular to an AR micro-projection color light machine and near-to-eye display equipment. Background The AR technology relies on the rapid development of high-performance artificial intelligence computing and micro-display technology, can carry out high-precision fusion on digital content and real scenes, and is widely applied to the vertical fields of visual information prompt, virtual-real interaction, industrial intelligent maintenance, immersive entertainment and the like in recent years. In an AR head-mounted near-to-eye display device, a micro-projection optical machine is used as a core imaging component, and the size, the display quality and the colorization capability of the micro-projection optical machine directly influence the wearing experience and the application effect of the whole machine. With the gradual maturation of Micro-display technologies such as Micro-LEDs, the market demands for Micro-projection optical machines with small volume, large field angle, high definition and full color display are increasingly urgent. Currently, in the existing AR near-eye display device, a Micro projector mostly adopts a single-chip Micro light emitting Diode (Micro LIGHT EMITTING Diode, abbreviated as Micro LED) or liquid crystal on silicon (Liquid Crystal on Silicon, abbreviated as LCOS) scheme, wherein the Micro LED scheme is focused on due to the advantages of high brightness, low power consumption, quick response and the like. However, the existing single-Green Micro LED solution is difficult to meet the full-color display requirement, and in order to realize colorization, a Red Green Blue (RGB for short) three-color combining architecture is generally adopted in the industry, for example, three monochromatic light paths are combined into one output through an X-cube color combining prism. Such color combining schemes generally require multiple imaging lenses to correct aberrations, and include diaphragms, prisms, multiple groups of lenses, etc. in the optical path to achieve high quality transmission of the image source to the optical waveguide or human eye. However, such color combining schemes are often difficult to achieve colorization and simultaneously have various performances such as small volume, large field angle, excellent optical effect, high definition, and the like. Disclosure of Invention The application provides an AR micro-projection color light machine and near-to-eye display equipment, which are used for solving the problems that the color is realized by adopting a scheme in the related technology, and meanwhile, the multi-aspect performances such as small volume, large field angle, excellent optical effect, high definition and the like are difficult to be simultaneously considered. In a first aspect, the present application provides an AR micro-projection color engine, comprising: The imaging lens group is used for imaging the light beam and comprises a diaphragm, a first lens, a second lens, a third lens and three fourth lenses which are sequentially arranged from the object side to the image side along the optical axis; The color combining prism is an X-cube color combining prism and is arranged between the third lens and the fourth lens and used for combining red, green and blue light paths into one-path color light path for output, and the color combining prism is a X-cube color combining prism and is used for combining the red, green and blue light paths into one-path color light path for output An image source arranged at the image side of the fourth lens for providing an electronic image; the first lens is a positive lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a positive lens, and the second lens and the third lens are cemented lenses. In one possible embodiment, the AR micro-projection color engine further comprises a structural member for supporting and fixing the imaging lens group, the color combining prism and the image source. In one possible embodiment, the AR micro-projection color engine has an optical system F-number in the range of 1.55 to 1.8. In one possible embodiment, the maximum field angle of the optical system of the AR micro-projection color engine is in the range of 29 ° to 31 °. In a possible embodiment the aperture of the diaphragm is in the range of 3.2mm to 3.4mm and/or the distance between the diaphragm and the object side of the first lens is in the range of 0.05mm to 0.1mm. In one possible embodiment, the total length L of the imaging lens group satisfies that 7 mm≤L≤8.5 mm. In one possible implementation, the operating wavelength of the imaging lens group covers 465nm 20nm, 530nm 20nm, and 620nm 20nm. In one possible implementation, the focal length f1 of the first lens, the focal length f2 of the seco