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CN-122003633-A - Projection substrate and glasses type terminal

CN122003633ACN 122003633 ACN122003633 ACN 122003633ACN-122003633-A

Abstract

A projection substrate includes an incidence region into which projection light is incident and which has a diffraction grating that guides at least a part of the incident projection light in a first direction and a second direction within the projection substrate, a first branch region having a diffraction grating that guides at least a part of the incident projection light in a third direction, a second branch region having a diffraction grating that guides at least a part of the incident projection light in a fourth direction, and an emission region into which the projection light guided in the first branch region and the second branch region is respectively incident and which has a diffraction grating that emits at least a part of the incident projection light as image light.

Inventors

  • UEDA MASAMICHI

Assignees

  • 赛利德株式会社

Dates

Publication Date
20260508
Application Date
20231016

Claims (10)

  1. 1. A projection substrate for transmitting at least a part of light incident from a first face to a second face on an opposite side of the first face and projecting image light on the second face, the projection substrate comprising: An incident region into which projection light for projecting the image light is incident, the incident region having a diffraction grating that guides at least a part of the incident projection light in a first direction within the projection substrate and a second direction that is a direction different from the first direction; A first branching region provided at a position in the first direction with respect to the incidence region, for incidence of the projection light guided by the incidence region, and having a diffraction grating for guiding at least a part of the incident projection light in a third direction different from the first direction; A second branching region provided at a position in the second direction with respect to the incidence region, for incidence of the projection light guided in the incidence region, and having a diffraction grating for guiding at least a part of the incident projection light in a fourth direction different from the second direction, and And an emission region provided at a position in the third direction with respect to the first branch region and at a position in the fourth direction with respect to the second branch region, in which the projection light guided by the first branch region and the second branch region is incident, and having a diffraction grating that emits at least a part of the incident projection light from the second surface as the image light.
  2. 2. The projection substrate of claim 1, wherein The incidence area has: A first diffraction grating for inputting light to be emitted toward the first branch region of the projection light incident on the incidence region, and And a second diffraction grating provided at a position different from the first diffraction grating, for inputting light to be emitted toward the second branch region among the projection light inputted to the input region.
  3. 3. The projection substrate of claim 1, wherein The incident region has a two-dimensional diffraction grating, guides at least a part of the incident projection light to the first branch region, and guides at least a part of the remaining light of the incident projection light to the second branch region.
  4. 4. The projection substrate of claim 1, wherein The incident region has a plurality of diffraction gratings or two-dimensional diffraction gratings of different periods, and light of a first wavelength included in the projection light is guided to the first branching region, and light of a second wavelength different from the first wavelength included in the projection light is guided to the second branching region.
  5. 5. The projection substrate of claim 4, wherein The incident region transmits light having wavelengths of red and green in the projection light to the first branch region, and transmits light having wavelengths of green and blue in the projection light to the second branch region.
  6. 6. The projection substrate of claim 1, wherein The incident region has a plurality of diffraction gratings or two-dimensional diffraction gratings of the same period, and the wavelength of the projection light to be guided to the first branch region is set to the same wavelength as the wavelength of the projection light to be guided to the second branch region.
  7. 7. The projection substrate of claim 1, wherein The first branching region guides at least a part of the projection light incident from the incident region to a region of the exit region including a predetermined region, The second branching region guides at least a part of the projection light incident from the incident region to a region of the exit region excluding the predetermined region.
  8. 8. The projection substrate of claim 1, wherein The first branching region guides at least a part of the projection light incident from the incident region to a region of the exit region including a predetermined region, The second branching region guides at least a part of the projection light incident from the incident region to a region of the exit region including the predetermined region.
  9. 9. The projection substrate of claim 1, wherein The emission region has a two-dimensional diffraction grating that emits at least a part of the projection light incident from the first branch region and at least a part of the projection light incident from the second branch region from the second surface as the image light.
  10. 10. An eyeglass-type terminal for wearing by a user, the eyeglass-type terminal comprising: The projection substrate according to any one of claims 1 to 9, provided as at least one of a right-eye lens and a left-eye lens of the user, configured to transmit at least a part of light incident from the first surface to the eye of the user and to project the image light on the second surface; a frame for fixing the projection substrate, and And a projection unit provided on the frame and configured to irradiate the projection light for projecting the image light onto the emission area onto the incidence area of the projection substrate.

Description

Projection substrate and glasses type terminal Technical Field The present invention relates to a projection substrate and a glasses type terminal. Background Conventionally, there are known a device such as a glasses type device or a head-mounted display that displays a two-dimensional image using an optical system including a waveguide (waveguide) or the like to view the user (for example, refer to patent document 1 and patent document 2). A two-dimensional diffraction grating that diffracts light in two directions is also known (see patent literature 3, for example). Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2017-207686 Patent document 2 International publication No. 2023/047488 Patent document 3 specification of U.S. Pat. No. 8160411 Disclosure of Invention Problems to be solved by the invention Such a device may have a complicated optical system because the optical system is installed in a limited space, which may lead to high manufacturing costs. Accordingly, the present invention has been made in view of these points, and an object of the present invention is to reduce the manufacturing cost of a projection substrate for allowing a user to view a projected image. Technical means for solving the problems In a first embodiment of the present invention, there is provided a projection substrate for transmitting at least a part of light incident from a first surface to a second surface on the opposite side of the first surface and projecting image light on the second surface, the projection substrate including an incident region for receiving the projected light for projecting the image light and having a diffraction grating for guiding at least a part of the incident projected light toward a first direction in the projection substrate and a second direction different from the first direction, a first branching region provided at a position of the first direction with respect to the incident region for receiving the projected light guided in the incident region and having a diffraction grating for directing at least a part of the incident projected light toward a third direction different from the first direction, a second branching region provided at a position of the second direction with respect to the incident region for receiving the projected light guided wave in the incident region, the diffraction grating having a position of the second direction different from the first direction and a position of the diffraction grating for branching the incident light in the incident region, and a diffraction grating provided at a position of the second branching region with respect to the second direction different from the first direction and a position of the diffraction grating provided at a position of the second branching region with respect to the incident region, the diffraction grating emits at least a part of the incident projection light from the second surface as the image light. The incidence region may have a first diffraction grating into which light to be emitted toward the first branch region among the projection light incident on the incidence region is incident, and a second diffraction grating provided at a position different from the first diffraction grating into which light to be emitted toward the second branch region among the projection light incident on the incidence region is incident. The incident region may have a two-dimensional diffraction grating, and may guide at least a part of the incident projection light to the first branch region and guide at least a part of the remaining light of the incident projection light to the second branch region. The incident region may have a plurality of diffraction gratings or two-dimensional diffraction gratings having different periods, and may be configured to transmit light of a first wavelength included in the projection light to the first branching region and transmit light of a second wavelength different from the first wavelength included in the projection light to the second branching region. The incident region may transmit light having wavelengths of red and green in the projection light to the first branch region, and transmit light having wavelengths of green and blue in the projection light to the second branch region. The incident region may have a plurality of diffraction gratings or two-dimensional diffraction gratings having the same period, and the wavelength of the projection light to be guided to the first branch region may be set to be the same as the wavelength of the projection light to be guided to the second branch region. The first branch region may guide at least a part of the projection light incident from the incident region to a region including a predetermined region of the emission region, and the second branch region may guide at least a part of the projection light incident from the incident region to a region not including the predetermined region of the emission r