Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical module, near-eye display device and light projection method

An optical module and optical path direction technology, applied in the optical field, can solve the problems of light leakage, affecting user experience, affecting user viewing experience, etc., to reduce light leakage, improve the feeling effect, and eliminate the effect of light leakage

Active Publication Date: 2022-07-19
SHANGHAI UROPTICS CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But in the current pancake solution, the light incident on the user's eyes, in addition to the light expected by the user, also has some undesired light, which affects the user experience
Especially when the incident angle of light is large, when the incident light passes through the reflective polarizer for the first time, it may not be completely reflected, but a large proportion of light leakage will occur, and part of the light will still pass through the reflective polarizer. Into the user's eyes, the intensity of light leakage may reach 38% of the signal light intensity along the optical axis, thereby affecting the user's viewing experience

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical module, near-eye display device and light projection method
  • Optical module, near-eye display device and light projection method
  • Optical module, near-eye display device and light projection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The optical path structure of Embodiment 1 is as follows figure 2 shown. Compared with Comparative Example 1, the first phase compensation unit RA is added to the optical path structure of Example 1. The first phase delay unit QWP1 is a negative phase delay unit, and the second phase delay unit QWP2 is a positive phase delay unit, which consists of n o >n e , and the optical axis satisfies α 2 =-α 1 =-45° (ie 135°) quarter-wave plate.

[0097] The first phase compensation RA may have various configurations. The parameters of the first phase compensation unit RA selected in this embodiment are shown in the following table, which includes a phase retardation plate A1 and a phase retardation plate A2 superimposed along the direction of the optical path. The parameters of the phase retarder A1 are as follows: n o e , the optical axis direction is parallel to the x-axis, and the phase retardation is 96 nm. The parameters of the phase retarder A2 are as follows: n o...

Embodiment 2

[0102] The optical path structure of embodiment 2 is as follows Figure 5 shown. Compared with Comparative Example 1, a second phase compensation unit RB is added to the optical path structure of Example 2. The first phase delay unit is a negative phase delay unit. The second phase delay unit is a positive phase delay unit, which consists of n o >n e , and the optical axis satisfies α 2 =-α 1 =-45° quarter-wave plate.

[0103] The second phase compensation unit RB may have various configurations. The parameters of the second phase compensation unit RB selected in this embodiment are shown in the following table, which includes a phase retardation plate B1 and a phase retardation plate B2 superimposed along the direction of the optical path. The parameters of the phase retarder B1 are as follows: n o e , the optical axis is parallel to the x-axis, and the phase retardation is 133 nm. The parameters of the phase retarder B2 are as follows: n o e , the optical axis is p...

Embodiment 3

[0108] The optical path structure of Embodiment 3 is as follows Figure 7 shown. Compared with Comparative Example 1, the optical path structure of Embodiment 3 adds a first phase compensation unit RA and a second phase compensation unit RB. The first phase delay unit is a positive phase delay unit. The second phase delay unit is a negative phase delay unit, which consists of n o >n e , and the optical axis satisfies α 2 =-α 1 = -45° quarter-wave plate composition

[0109] The first phase compensation unit RA may have various configurations. The selected parameters of the first phase compensation unit RA in this embodiment are as follows: it includes a phase retardation plate A1 and a phase retardation plate A2 superimposed along the direction of the optical path. The parameters of the phase retarder A1 are as follows: n o e , the optical axis is parallel to the x-axis, and the phase retardation is 206 nm. The parameters of the phase retarder A2 are as follows: n o e...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an optical module, which includes a polarization beam splitter, a first phase delay unit, a semi-transparent and semi-reflective layer, a second phase delay unit and a polarizer in sequence along an optical path direction, a first phase delay unit and a second phase delay unit The units are both positive phase delay units or both negative phase delay units and satisfy the following relationship: α 1 =α 2 =45° or 135°; or it is a positive phase delay unit or a negative phase delay unit of the opposite type, which satisfies the following relationship: α 1 =‑α 2 =45° or 135°, the optical module further includes: a first phase compensation unit located between the first phase retardation unit and the polarizing beam splitter, and the optical axis of the first phase compensation unit is located in the right direction with the light transmission axis of the polarizing beam splitter. In the intersecting plane, or in the plane orthogonal to the reflection axis of the polarizing beam splitter; and / or the second phase compensation unit located between the second phase retardation unit and the polarizer, the optical axis of the second phase compensation unit is located in the In a plane orthogonal to the transmission axis of the polarizer, or in a plane orthogonal to the absorption axis of the polarizer.

Description

technical field [0001] The present invention generally relates to the field of optics, and in particular, to an optical module, a near-eye display device and a light projection method. Background technique [0002] In Virtual Display (VR), Augmented Display (AR), and other hybrid display technologies, optical modules are required to present images to the user. Existing optical modules are generally larger in size, and the thickness is often more than 30mm. With the advancement of technology, users pay more and more attention to the volume and weight of products. Therefore, it is necessary to develop a small and light product to meet the needs of the market. demand. Among them, the most limited factor is the optical module therein. In order to solve the above-mentioned volume and weight problems, many companies have launched VR or AR solutions based on pancake technology solutions, that is, optical modules based on folded optical paths. [0003] In an optical module with a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/01G02B27/28
CPCG02B27/0172G02B27/283G02B27/286
Inventor 梁乾亿吴皓王天寅杨兴朋
Owner SHANGHAI UROPTICS CO LTD