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CN-121997617-A - Diffraction optical waveguide rainbow pattern simulation analysis method

CN121997617ACN 121997617 ACN121997617 ACN 121997617ACN-121997617-A

Abstract

The scheme belongs to the technical field of diffraction optical waveguides and discloses a diffraction optical waveguide rainbow pattern simulation analysis method. According to the method, whether the diffraction light causes rainbow patterns for entering eyes or not is judged in advance through whether the diffraction light area and the eye view field area are intersected or not and whether the eye movement range back projection area and the grating area are intersected or not, so that the diffraction light causing the rainbow patterns for entering eyes is simulated only in the subsequent steps, unnecessary simulation can be avoided, and the simulation speed is improved. Therefore, the method can rapidly and quantitatively evaluate the rainbow pattern distribution of the diffraction optical waveguide with different design schemes in the design stage of the diffraction optical waveguide, and is beneficial to accurately predicting the rainbow pattern condition of the optical waveguide product, rapidly screening and improving the design scheme of the optical waveguide. Moreover, the step of screening the second subset may be synchronized to obtain the area of the backprojected intersection area so that the subsequent calculation step takes its influence into account, improving the accuracy of the simulation result.

Inventors

  • YANG MU
  • Hu Dejiao
  • DU YOUCHENG

Assignees

  • 尼卡光学(天津)有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (10)

  1. 1. A diffraction optical waveguide rainbow-print simulation analysis method, comprising: Drawing a normalized K domain diagram containing translation vectors corresponding to all gratings in the diffraction optical waveguide, an ambient light region and a human eye view field region according to design parameters of the diffraction optical waveguide, an ambient light incident angle and the human eye view field, and translating the ambient light region along the translation vectors corresponding to all gratings in the diffraction optical waveguide to obtain a diffracted light region, so as to obtain all diffracted light generated by the diffraction of the ambient light by all gratings; Screening the first subset from all diffracted light according to the intersection of the diffracted light region and the human eye field of view region; Screening the second subset from the first subset according to the intersection of the eye movement range back projection area and the grating area; calculating a rainbow pattern distribution for all diffracted light of the second subset; the human eye view field region refers to a region representing a human eye view field in the normalized K domain image, the ambient light region refers to a region representing an ambient light incident angle in the normalized K domain image, the diffracted light region refers to a region representing a diffracted light diffraction angle in the normalized K domain image, the eye movement range back projection region refers to a projection region of the eye movement range back-projected to the diffractive optical waveguide along the diffracted light, and the grating region refers to a region occupied by a grating of the diffracted light on the diffractive optical waveguide when the eye movement range back projection is generated by diffraction.
  2. 2. The method of claim 1, wherein the steps of, The rainbow pattern distribution includes a color distribution and a power distribution.
  3. 3. The method of claim 2, wherein the step of calculating the rainbow pattern distribution for all diffracted light of the second subset comprises: According to the structural parameters of each grating and the combination of a plurality of wavelengths and incidence angles of the environment light corresponding to each diffraction angle diffraction light generated by diffraction of the grating, diffraction efficiency of each diffraction angle diffraction light of each diffraction angle from each grating in the second subset is calculated according to strict coupled wave analysis; Diffraction efficiency of each wavelength of diffracted light according to each diffraction angle generated by diffraction of each grating The area of intersection of the back projection region and the grating region of the eye movement range corresponding to the diffracted light And a scale factor According to the formula Calculating the power of each wavelength of diffracted light at each diffraction angle from each grating in the second subset; Calculating the normalized weights of different wavelengths of the diffraction lights of all diffraction angles from all gratings in the second subset according to the multiple wavelengths of the diffraction lights of all diffraction angles and the power duty ratio of all wavelengths generated by the diffraction of all gratings, and calculating the colors and the powers of the multiple wavelengths of the diffraction lights of all diffraction angles from all gratings in the second subset according to the color matching function of CIE standard; And synthesizing a color and power distribution diagram of rainbow patterns according to a plurality of diffraction angles of diffracted light generated by diffraction of each grating and coordinates of intersection of a back projection area and a grating area of each diffraction angle, power and eye movement range.
  4. 4. A diffraction optical waveguide rainbow-tie simulation analysis method according to claim 2 or 3, wherein, At least one grating in the diffraction optical waveguide is a change grating with microstructure changing along with the spatial position.
  5. 5. The method of simulating analysis of a diffraction optical waveguide rainbow pattern of claim 4, For diffracted light from the varying grating in the second subset, the step of calculating the rainbow-pattern distribution comprises: Discretizing the change grating into a plurality of subareas according to the change form of the change grating; Respectively calculating diffraction efficiency of each diffraction angle diffraction light of each sub-area of each change grating in the second subset according to the structural parameter of each sub-area and the combination of a plurality of wavelengths and incidence angles of the environment light corresponding to each diffraction angle diffraction light generated by diffraction of the sub-area and strict coupling wave analysis; A plurality of corresponding sub-regions for each wavelength of diffracted light according to each diffraction angle generated by each variation grating diffraction Is not less than the diffraction efficiency of (2) A plurality of corresponding sub-regions of the diffracted light Is defined by the area of intersection of the eye movement range back projection region and the grating region And a scale factor According to the formula Calculating the power of each wavelength of diffracted light at each diffraction angle from each variable grating in the second subset; Calculating the normalized weights of different wavelengths of the diffraction lights of all diffraction angles from all the change gratings in the second subset according to the multiple wavelengths of the diffraction lights of all diffraction angles and the power duty ratio of each wavelength generated by the diffraction of each change grating, and calculating the colors and the powers of the multiple wavelengths of the diffraction lights of all the change gratings in the second subset according to the color matching function of CIE standard; And synthesizing a color and power distribution diagram of rainbow patterns according to a plurality of diffraction angles of diffracted light generated by diffraction of each changed grating and coordinates of intersection of a back projection area and a grating area of each diffraction angle, and the power and the eye movement range.
  6. 6. The method of simulating analysis of a diffraction optical waveguide rainbow pattern of claim 5, The ambient light is visible light with the wavelength range of 400-700 nm, or the ambient light is a light source with a specific spectrum, and the scale factor The weighting of wavelengths is implicit.
  7. 7. The method for simulating analysis of diffraction optical waveguide rainbow patterns according to any one of claims 1 to 3, wherein, The ambient light is the ambient light with all incidence angles, the ambient light area is the inner circle in the normalized K domain graph, or the ambient light is the ambient light with a specific incidence angle, and the ambient light area is one area in the inner circle in the normalized K domain graph.
  8. 8. The method for simulating analysis of diffraction optical waveguide rainbow patterns according to any one of claims 1 to 3, wherein, The eye movement range comprises an eye pupil at a specific position, and if the eye movement range is only the eye pupil at the specific position, the eye movement range back projection area is an eye pupil back projection area.
  9. 9. A method of simulated analysis of a diffractive optical waveguide rainbow pattern according to any one of claims 1 to 3, wherein the step of screening the first subset of all diffracted light according to the intersection of the area of diffracted light with the area of the field of view of the human eye comprises: Judging whether an intersection exists between the diffraction light area and the human eye view field area; if yes, screening the diffracted light falling into an intersection of the diffracted light region and a human eye view field region into a first subset; If not, judging that the diffraction optical waveguide does not have rainbow patterns interfering with human eyes and ending simulation.
  10. 10. A method of simulated analysis of diffraction optical waveguides as claimed in any of claims 1 to 3 wherein said step of screening the first subset for the second subset based on the intersection of the eye movement range back projection region with the grating region comprises: For each diffraction angle in the first subset, defining a region occupied by a grating for diffracting the generated diffraction light on the diffraction optical waveguide as a grating region, and back-projecting an eye movement range to the diffraction optical waveguide along the diffraction light to obtain an eye movement range back-projection region; judging whether an intersection exists between the back projection area of the eye movement range and the grating area; If yes, screening the diffracted light falling into the intersection of the back projection area and the grating area of the eye movement range into a second subset; If not, judging that the diffraction optical waveguide does not have rainbow patterns interfering with human eyes and ending simulation.

Description

Diffraction optical waveguide rainbow pattern simulation analysis method Technical Field The scheme belongs to the technical field of diffraction optical waveguides, and particularly relates to a diffraction optical waveguide rainbow pattern simulation analysis method. Background The diffractive optical waveguide display technology uses gratings to achieve the in, turning and out of image beams. Light with various wavelengths in the external environment is diffracted after entering the grating and forms dispersion, and the diffracted light possibly enters human eyes to cause glare like rainbow, and can cause interference to a wearer to influence experience. Diffraction of the grating on the light guide to the outside environment light is unavoidable, and how to evaluate interference of the rainbow patterns to human eyes is considered in the design of the diffraction light guide, and how to restrain the interference. The rainbow patterns caused by different diffractive light guides are significantly different, and the distribution of the rainbow patterns in the field of view of human eyes is affected by a plurality of factors, so that the rainbow patterns cannot be intuitively estimated when designing. Thus, in the design phase, a rapid, quantitative simulation and analysis method is needed to predict the rainbow pattern intensity of the optical waveguide and the distribution in the field of view of the human eye, thereby assisting in improving the design. Disclosure of Invention The scheme aims to overcome at least one defect in the prior art, and provides a diffraction optical waveguide rainbow pattern simulation analysis method which is used for rapidly predicting the rainbow pattern intensity of optical waveguides and the distribution situation in the field of view of human eyes. In order to solve the technical problems, the following technical scheme is adopted: A diffraction optical waveguide rainbow pattern simulation analysis method comprises the following steps: Drawing a normalized K domain diagram containing translation vectors corresponding to all gratings in the diffraction optical waveguide, an ambient light region and a human eye view field region according to design parameters of the diffraction optical waveguide, an ambient light incident angle and the human eye view field, and translating the ambient light region along the translation vectors corresponding to all gratings in the diffraction optical waveguide to obtain a diffracted light region, so as to obtain all diffracted light generated by the diffraction of the ambient light by all gratings; Screening the first subset from all diffracted light according to the intersection of the diffracted light region and the human eye field of view region; Screening the second subset from the first subset according to the intersection of the eye movement range back projection area and the grating area; calculating a rainbow pattern distribution for all diffracted light of the second subset; The human eye view field region refers to a region representing a human eye view field in the normalized K domain image, the ambient light region refers to a region representing an ambient light incident angle in the normalized K domain image, the diffracted light region refers to a region representing a diffracted light diffraction angle in the normalized K domain image, the eye movement range back projection region refers to a projection region of the eye movement range back-projected along the diffracted light to the diffraction optical waveguide, and the grating region refers to a region occupied by a grating of the diffracted light along the diffraction optical waveguide when the eye movement range back projection is generated by diffraction. According to the method, whether the diffraction light causes rainbow patterns for entering eyes or not is judged in advance through whether the diffraction light area is intersected with the visual field area of the eyes or not and whether the back projection area of the eye movement range is intersected with the grating area or not, so that the diffraction light causing the rainbow patterns for entering eyes is simulated only in the subsequent steps, unnecessary simulation can be avoided, and the simulation speed is improved. Therefore, the method can rapidly and quantitatively evaluate the rainbow pattern distribution of the diffraction optical waveguide with different design schemes in the design stage of the diffraction optical waveguide, and is beneficial to accurately predicting the rainbow pattern condition of the optical waveguide product, rapidly screening and improving the design scheme of the optical waveguide. Moreover, the step of screening the second subset may be synchronized to obtain the area of the backprojected intersection area so that the subsequent calculation step takes its influence into account, improving the accuracy of the simulation result. Preferably, the rainbow pattern distribution includ