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CN-122018166-A - Clip type AR (augmented reality) glasses system based on one-to-two optical waveguide module and implementation method thereof

CN122018166ACN 122018166 ACN122018166 ACN 122018166ACN-122018166-A

Abstract

The invention discloses a clip type AR (augmented reality) glasses system based on a one-to-two optical waveguide module and an implementation method thereof, belongs to the technical field of augmented reality near-to-eye display equipment, and solves the problems that the existing AR glasses are high in cost, poor in suitability, large in size of binocular external hanging equipment, high in power consumption and lack of an automatic alignment function. The system is detachably fixed on common glasses through a mechanical clamping unit, realizes binocular AR display driven by a single optical machine by utilizing a single display optical machine, a one-to-two beam splitting module, a micro lens array and left and right optical waveguide lenses in an optical display unit, acquires the pupil position of a wearer in real time by a sensing module and an adjustable optical compensation module of an automatic alignment mechanism and dynamically adjusts the direction of a light beam so as to compensate the offset between an optical axis and a visual axis of human eyes. The system is mainly used for rapidly upgrading the conventional common glasses of the user into lightweight and high-precision aligned binocular AR display equipment, and improving wearing comfort and display fusion effect.

Inventors

  • CUI HAITAO
  • WEI CHENG

Assignees

  • 广东谷东智能科技有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. A clip-on AR eyewear system based on a one-to-two optical waveguide module, comprising: the mechanical clamping unit is used for detachably fixing the glasses system on a glasses frame or a nose bridge of the common glasses and comprises an elastic clamping jaw and a nose bridge limiting block; The optical display unit is fixedly connected to the mechanical clamping unit and is used for binocular AR display driven by a single optical machine and comprises a single display optical machine, a one-to-two beam splitting module, a micro lens array and optical waveguide lenses which are symmetrically arranged left and right, wherein the single display optical machine, the one-to-two beam splitting module, the micro lens array and the optical waveguide lenses are sequentially arranged and fixed along an optical path, and outgoing light of the single display optical machine is split by the one-to-two beam splitting module in sequence, and is respectively coupled into the left and right optical waveguide lenses after being focused by the micro lens array; The automatic alignment mechanism comprises a sensing module and an adjustable optical compensation module, wherein the sensing module is arranged on the mechanical clamping unit, the adjustable optical compensation module is arranged in a light path of the optical display unit, the sensing module is used for acquiring pupil position information of a wearer, and the adjustable optical compensation module is arranged in the light path of the optical display unit and dynamically adjusts the direction of a light beam entering the optical waveguide lens according to the pupil position information so as to compensate offset between an optical axis and a visual axis of human eyes.
  2. 2. The clip-on AR eyewear system of claim 1 wherein the clip-on AR eyewear system comprises a one-to-two optical waveguide module, In the mechanical clamping unit, the elastic clamping jaw is formed by stamping titanium alloy spring steel, the opening and closing angle of the elastic clamping jaw is 30-60 degrees, a silica gel anti-slip pad with the thickness of 0.5mm is stuck on the inner side of the elastic clamping jaw, and a limiting step for limiting the vertical distance between the clamping jaw and the common glasses is arranged on the inner side of the elastic clamping jaw; the nose bridge limiting block is made of silica gel, and the width adjustable range of the nose bridge limiting block is 50-70mm; the contact part of the elastic clamping jaw and the glasses frame is embedded with a neodymium iron boron magnetic sheet, and the auxiliary suction force provided by the magnetic sheet is 0.5-1.0N.
  3. 3. The clip-type AR glasses system based on a one-to-two optical waveguide module according to claim 1, wherein in the optical display unit, the one-to-two optical waveguide module includes a polarization beam splitting prism and a half-transmission film, the extinction ratio of the polarization beam splitting prism is greater than or equal to 1000:1, the transmittance of the half-transmission film is 50% ± 5%, the half-transmission film is used for dividing a single beam into left and right two paths, and the half-transmission film is configured such that the energy difference between the left and right two paths of split beams is less than or equal to 5%; the micro lens array is UV curing resin; The optical waveguide lens is made of PMMA, and the coupling-in grating and the coupling-out grating are manufactured by adopting a nanoimprint process.
  4. 4. The clip-on AR glasses system according to claim 1, wherein the automatic alignment mechanism is an optical alignment mechanism integrated inside the optical display unit, and further comprising a control module; The sensing module comprises at least one miniature near infrared camera arranged on one side of the nose bridge limiting block facing the human eyes and is used for collecting pupil position images of the eyes of a wearer at the moment of assembly and wearing; The control module is connected with the sensing module and is used for calculating and generating a display content driving signal and a light beam deflection control signal which are matched with the pupil center positions of the left eye and the right eye according to the pupil position image; The adjustable optical compensation module comprises liquid crystal polarization grating components which are respectively arranged on incident light paths of the left optical waveguide lens and the right optical waveguide lens which are coupled with the gratings, the liquid crystal polarization grating components are connected with the control module and are used for changing the vector direction of the gratings according to the light beam deflection control signals, so that micro-angle deflection is carried out on light beams which are emitted by the micro-lens array and are to be coupled with the optical waveguides, and offset between the optical axis of the optical display unit and the visual axis of a human eye caused by mechanical assembly deviation is compensated.
  5. 5. The clip-on AR glasses system according to claim 4, wherein the alignment method of the automatic alignment mechanism comprises the steps of: capturing, by the miniature near infrared camera, an image containing a binocular region at an initial moment of a user wearing the eyeglass system; The image processing unit in the control module recognizes and extracts pupil center coordinates of left and right eyes in the image, and calculates offset between an optical axis of the optical display unit and an actual visual axis of a user in a horizontal direction and a vertical direction by combining known internal parameters and mounting position external parameters of the miniature near infrared camera; the control module generates two independent control signals according to the offset, wherein the first path is a display content driving signal of the single display optical machine and is used for pre-correcting the rendering position of the virtual image according to the pupil position; The liquid crystal polarization grating component dynamically changes the arrangement period and direction of liquid crystal molecules in the liquid crystal polarization grating component according to the driving voltage signal, so that the grating vector of the liquid crystal polarization grating component is adjusted, and the modulated light beam generates micro-angle deflection with the same offset and opposite direction; The deflected light beam enters the waveguide through the coupling-in grating of the optical waveguide lens to carry out total reflection propagation, finally exits from the coupling-out grating and enters the human eye, and the direction of the emergent light beam is compensated and aligned with the actual visual axis of the user, so that the precise fusion of the virtual image and the actual visual field is realized.
  6. 6. The clip-type AR glasses system based on the one-driving-two optical waveguide module according to claim 1, wherein an anti-glare film or an anti-fog coating is arranged on the surface of the optical waveguide lens, and the reflectivity of the anti-glare film is less than or equal to 1%.
  7. 7. The clip-type AR glasses system based on a one-to-two optical waveguide module according to claim 1, wherein the arm length of the elastic clamping jaw is adjustable in the range of 10-15mm, and/or the position of the magnetic sheet is slidable along the clamping jaw in the range of 5-10mm.
  8. 8. The clip-on AR glasses system according to claim 1, wherein the focal length and arrangement density of the microlens array are configured to focus the beam output from the beam splitting module to the entire effective area of the optical waveguide coupling grating with a uniformity of the focused light spot greater than 90% at a fixed mounting distance defined by the mechanical clamping and alignment integration module.
  9. 9. The clip-on AR glasses system according to claim 1, wherein the optical waveguide lens is a curved design.
  10. 10. The method of implementing a clip-on AR eyeglass system according to any of claims 1 to 9, characterized in that the following operations are performed: an AR (augmented reality) glasses module comprising an optical display unit and an automatic alignment mechanism is detachably fixed on common glasses worn by a user through an elastic clamping jaw of a mechanical clamping unit and a nose bridge limiting block, wherein the center of the nose bridge limiting block is coincident with the optical axis of the optical display unit; The method comprises the steps of starting a single display optical machine to generate an image light beam, enabling the light beam to be sequentially focused through a two-split light-splitting module and a micro lens array to form two paths of focused light beams respectively pointing to the left eye and the right eye; Driving an adjustable optical compensation module arranged in the optical path according to the offset, and dynamically adjusting the directions of the two paths of focused light beams to compensate the offset; And finally, respectively coupling the light beams subjected to the direction compensation into the left optical waveguide lens and the right optical waveguide lens, transmitting the light beams through the waveguides, and then emitting the light beams to form a virtual image aligned with the visual axis of the wearer.

Description

Clip type AR (augmented reality) glasses system based on one-to-two optical waveguide module and implementation method thereof Technical Field The invention relates to the technical field of Augmented Reality (AR) near-to-eye display equipment, belongs to the field of engineering design of wearable optical equipment, aims at the rapid upgrading requirement of common glasses (myopia glasses, sunglasses, plano-glasses and the like), and particularly relates to an AR glasses system with a clamping piece type structure based on a one-to-two optical waveguide module and an implementation method thereof. Background The existing AR glasses and the externally hung display equipment have obvious engineering defects. Conventional AR glasses generally require a user to replace the entire pair of glasses frames, are high in cost, have a price ranging from 2000 to 25000 yuan, cannot be compatible with the original glasses such as a near-view mirror of the user, and are poor in adaptability. Most of the externally hung AR display devices on the market are designed in a monocular mode, the weight of the externally hung AR display devices is 15-20 g, the problem of side tilting is easy to generate when the externally hung AR display devices are worn, and even though the externally hung AR display devices are in a binocular externally hung mode, the externally hung AR display devices are driven by double optical machines, the size of the externally hung AR display devices is increased by about 40%, the power consumption is increased by about 30%, and the cost is increased by about 50%. In addition, the common external hanging equipment lacks an automatic positioning mechanism, and the deviation between an optical axis and the eye position of a user after assembly can reach 3 to 5 millimeters, so that obvious virtual image deviation is caused, and the user experience is seriously influenced. At present, no mature scheme is available for rapidly upgrading common glasses into binocular AR equipment, and a user has to additionally purchase a special glasses frame, so that economic burden is increased. Therefore, the prior art scheme is difficult to simultaneously meet the four core requirements of low cost, light weight, high adaptability and binocular display. Specifically, the existing binocular external AR display equipment is mostly fixed on the front sides of left and right glasses legs or above the glasses frames respectively by two independent optical machines, and the optical machines protrude from two sides of the glasses, so that the overall width is increased, the vision is bloated, and the active alignment difficulty and the binocular fusion difficulty in assembly are increased. Disclosure of Invention It is an aim of embodiments of the present invention to address at least the above problems and/or disadvantages and to provide at least the advantages described below. The invention aims to provide a clip type AR (augmented reality) glasses system based on a one-to-two optical waveguide module. The problems that the existing AR glasses are high in cost and cannot be compatible with original ordinary glasses (such as a near-view mirror and a sunglasses) of a user, the size, power consumption and cost of equipment are obviously increased due to the fact that a double-optical machine is needed in a traditional binocular external hanging scheme, and virtual images are seriously offset and poor in experience after the assembly due to the fact that an automatic alignment function is lacked are solved. The problem that the clamping type AR equipment is not firm in fixation on common glasses, easy to slide or fall off, incapable of being matched with the widths of the glasses frames and the nose bridges of different sizes and overlarge initial alignment errors of the optical system and human eyes caused by poor mechanical installation repeatability is solved. To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided: A clip-on AR eyewear system based on a one-to-two optical waveguide module, comprising: the mechanical clamping unit is used for detachably fixing the glasses system on a glasses frame or a nose bridge of the common glasses and comprises an elastic clamping jaw and a nose bridge limiting block; The optical display unit is fixedly connected to the mechanical clamping unit and is used for binocular AR display driven by a single optical machine and comprises a single display optical machine, a one-to-two beam splitting module, a micro lens array and optical waveguide lenses which are symmetrically arranged left and right, wherein the single display optical machine, the one-to-two beam splitting module, the micro lens array and the optical waveguide lenses are sequentially arranged and fixed along an optical path, and outgoing light of the single display optical machine is split by the one-to-two beam splitting module in sequence, and is respectively coupled