Intaglio Cover Layer for HMD Luminance Uniformity
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Solution Overview
Problem
Head-mounted display devices suffer from a screen-door effect (SDE) due to luminance differences between pixel center and peripheral regions, leading to deteriorated display quality, especially with their wider field of view compared to flat-panel displays.
Innovation Solution
A display module with a sealing element featuring a transparent base part and a cover layer with intaglio patterns of varying depths, including first, second, and third patterns, alternatingly disposed, made of silicon dioxide, to reduce optical diffraction and enhance luminance uniformity across the pixel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a head-mounted display device provides a wider field of view, then the user experience is improved, but the screen-door effect becomes more prominent and display quality deteriorates
Solution Approach 1:
The patent applies local quality by creating different intaglio pattern depths at different locations on the cover layer. Specifically, the first intaglio patterns have a first depth while the second intaglio patterns have a second depth different from the first depth. This spatial variation in pattern depth allows different regions of the display to have optimized optical properties, compensating for the luminance differences that occur across the wider field of view and reducing the screen-door effect.
2Manufacturing precision
If the luminance difference between pixel center and peripheral regions is reduced, then display quality is improved, but the structure becomes more complex with multiple pattern depths
Solution Approach 1:
The patent applies parameter changes by varying the depth parameter of the intaglio patterns across different regions of the cover layer. The first intaglio patterns are engraved to a first depth while the second intaglio patterns are engraved to a second depth different from the first depth. This parameter variation optimizes light extraction and luminance uniformity across the pixel region, reducing the screen-door effect while maintaining a relatively simple overall structure that can be manufactured using standard semiconductor fabrication processes.
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 effectively suppresses the screen-door effect, improving display quality and visibility in head-mounted display devices by minimizing luminance differences between the center and edge regions of pixels, resulting in more uniform and immersive virtual reality experiences.
Implementation Method 1
A display module with a sealing element featuring a transparent base part and a cover layer with intaglio patterns of varying depths, including first, second, and third patterns, alternatingly disposed, made of silicon dioxide, to reduce optical diffraction and enhance luminance uniformity across the pixel region.
Data Source
AI summary
A display module includes a plurality of light-emitting elements and a sealing element sealing the plurality of light-emitting elements. The sealing element includes a base part including a transparent material and a cover layer. The cover layer is in contact with a surface of the base part and includes a plurality of first patterns, each of which is engraved in an intaglio manner to a first depth, and a plurality of second patterns, each of which is engraved in an intaglio manner to a second depth different from the first depth.