Variable Interval Optical Mechanism for VR Display Diopter Adjustment
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Solution Overview
Problem
Head-mounted displays for virtual reality struggle to provide clear virtual images for users with poor eyesight, as existing technologies lack effective diopter scale adjustment mechanisms to optimize image visibility based on individual eye sight.
Innovation Solution
The display device incorporates a variable mechanism that adjusts the interval between optical structures, including a holographic optical element and a reflective polarizer, to change the optical path length and focus, allowing for independent adjustment of virtual image positions for each eye, using a combination of retardation films, semi-transmissive layers, and liquid crystal elements to enhance image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed optical system is used in head-mounted display, then the device structure is simple, but users with poor eyesight cannot see clear virtual images
Solution Approach 1:
The patent implements a variable mechanism that allows dynamic adjustment of the interval between the holographic optical element and the reflective polarizer. This dynamic adjustment capability enables the optical system to adapt to different user eyesight conditions, transforming a fixed optical system into an adjustable one that can accommodate users with varying levels of nearsightedness while maintaining clear virtual image display.
Solution Approach 2:
The patent changes the physical parameter of the interval distance between optical components (holographic optical element and reflective polarizer) to adjust the diopter scale. By varying this spatial parameter, the system modifies the optical path length and focal characteristics, enabling clear image display for users with different eyesight requirements without changing the fundamental optical design.
2Adaptability or versatility
If the interval between optical structures is fixed, then manufacturing is easy, but diopter scale adjustment is not possible
Solution Approach 1:
The variable mechanism introduces dynamic adjustability to the optical assembly, allowing the interval between components to be changed during use rather than being fixed during manufacturing. This enables the system to accommodate different diopter requirements while maintaining a relatively simple manufacturing process for the base optical structure.
3Adaptability or versatility
If adjustable mechanism is added to change optical path length, then virtual image position can be adjusted for each eye, but device complexity increases
Solution Approach 1:
The variable mechanism provides a relatively simple dynamic adjustment system that allows independent modification of the optical path length for each eye. By enabling adjustable intervals between the holographic optical element and reflective polarizer, the system achieves personalized virtual image positioning without requiring complex multi-component adjustment mechanisms.
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
This configuration enables clear virtual image display tailored to the user's eyesight, preventing axial displacement and light efficiency reduction, and allows for diopter scale adjustment, improving visibility for users with varying levels of nearsightedness.
Implementation Method 1
a first structure 4A comprising a first retardation film R1 facing the display module DM, a holographic optical element 20 facing the first retardation film R1, and a second retardation film R2 facing the holographic optical element 20
Implementation Method 2
a second structure 4B comprising a reflective polarizer PR facing the second retardation film R2
Implementation Method 3
a liquid crystal element 10 facing the third retardation film R3 and having a lens effect
Implementation Method 4
a liquid crystal element 10 facing the third retardation film R3 and having a lens effect
Implementation Method 5
a semi-transmissive layer HM facing the first retardation film R1
Data Source
AI summary
According to one embodiment, a display device includes a display module configured to emit display light which is linearly polarized light, a first structure including a first retardation film facing the display module, a holographic optical element facing the first retardation film, and a second retardation film facing the holographic optical element, a second structure including a reflective polarizer facing the second retardation film, and a transparent substrate facing the reflective polarizer, and a variable mechanism by which an interval between the first structure and the second structure is made variable.