Folded-Path Display Module With Integrated Polarizer for Light Utilization
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Solution Overview
Problem
Conventional display modules in virtual reality devices suffer from weakened light energy due to multiple reflections, scattering, and transmission in the folded-type light path, leading to a low light energy utilization rate.
Innovation Solution
A display module comprising a display screen component, an optical lens component, and a convex lens component in sequence, where the optical lens component and convex lens component are optically coaxial, and an optical integrated element with a reflective polarizing film or nano-imprinted metal grating is used to reduce the number of reflections, scattering, and transmission, improving light energy utilization and module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a folded-type light path is adopted to achieve ultra-short focus distance, then the focal length is reduced, but the light energy utilization rate decreases due to multiple reflections, scattering, and transmission
Solution Approach 1:
The patent combines the reflective polarizer, quarter wave plate, and anti-reflection film into an integrated optical structure. The reflective polarizer and quarter wave plate are laminated together with their interfaces optically bonded, eliminating separate interfaces that cause scattering and reflection losses. This merging reduces the number of optical interfaces from multiple separate components to an integrated unit, thereby improving light energy utilization while maintaining the folded light path's ultra-short focal length capability
Solution Approach 2:
The patent utilizes the polarization properties of light and the reflective polarizer to convert potentially harmful multiple reflections into beneficial single-reflection paths. By positioning the reflective polarizer at specific angles and combining it with quarter wave plates, the system converts what would be multiple scattering events into controlled, predictable reflection paths that maintain light energy. The integrated structure ensures that light undergoes the necessary reflections for the folded path while minimizing energy loss through interface optimization
2Adaptability or versatility
If multiple optical components are laminated to form the convex lens component, then the optical functionality is enhanced, but the module thickness increases
Solution Approach 1:
The patent merges multiple optical components (reflective polarizer, quarter wave plate, anti-reflection film) into a single laminated optical integrated element. These components are bonded together with their interfaces optically coupled, creating a compact assembly that provides multiple optical functions (polarization, reflection, anti-reflection) within a minimized thickness. This integration maintains full optical functionality while significantly reducing the overall module thickness compared to separate component arrangements
Solution Approach 2:
The patent implements a nested structure where the reflective polarizer and quarter wave plate are laminated together with the anti-reflection film on the outer surface. Each component is positioned and bonded to the next, creating a compact nested arrangement where multiple functional layers are integrated within a single optical element assembly. This nesting approach allows multiple optical functions to coexist in a minimized space, reducing module thickness while maintaining adaptability and optical performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances light energy utilization and reduces the thickness of the display module by minimizing reflections, scattering, and transmission, resulting in improved image quality and reduced module thickness.
Implementation Method 1
a coated reflective polarizing film or a nano-imprinted metal grating. The reflective polarizing film or the metal grating is attached to the second absorption polarizer. Wherein an absorption axis of the first absorption polarizer is parallel to an absorption axis of the second absorption polarizer. A fast axis of the second quarter wave plate and a grating extension direction of the metal grating form an angle of 45 degrees. The fast axis of the second quarter wave plate and a transmission axis of the reflective polarizing film form an angle of 45 degrees.
Implementation Method 2
The reflective polarizing film or the metal grating is attached to the second absorption polarizer. A fast axis of the second quarter wave plate and a transmission axis of the reflective polarizing film form an angle of 45 degrees.
Implementation Method 3
The optical integrated element comprises a second quarter wave plate and, on one side surface of the optical integrated element, a coated reflective polarizing film or a nano-imprinted metal grating.
Implementation Method 4
The display screen component comprises a display screen, a first absorption polarizer, and a first quarter wave plate in sequence from the display side to the viewing side. The convex lens component comprises a convex lens, a second absorption polarizer, and an optical integrated element
Data Source
AI summary
A display module and manufacturing method thereof. The display module comprises a display screen, a first absorption polarizer, a first quarter wave plate, an optical lens component, and a convex lens component in sequence from a display side to a viewing side. The optical lens component and the convex lens component are optically coaxial. The convex lens component comprises a convex lens, a second absorption polarizer, and an optical integrated element, which are laminated in sequence from the viewing side to the display side. The optical integrated element comprises a second quarter wave plate and, on one side surface of the optical integrated element, a coated reflective polarizing film or a nano-imprinted metal grating. The reflective polarizing film or the metal grating is attached to the second absorption polarizer.