Lens and Light Blocking Layout for HMD Image Mixing Control
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Solution Overview
Problem
Existing head-mounted displays (HMDs) face issues with image superimposition and mixing, which degrade image quality, particularly when accounting for variations in user binocular distance.
Innovation Solution
A display device with a lens layer and light blocking layer having specific openings and a liquid crystal lens controller that adjusts focal distance based on binocular distance, controlling the lens layer's focal properties to minimize image overlap and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional light blocking layer with uniform openings is used, then the structure is simple, but image superimposition and mixing occur reducing image quality
Solution Approach 1:
The light blocking layer employs different opening sizes at different locations: a first opening with a first size at a first location and a second opening with a second size at a second location. This local differentiation prevents image superimposition and mixing by selectively blocking light paths, thereby improving image quality without requiring complete structural redesign.
Solution Approach 2:
The light blocking layer is segmented into multiple openings with different sizes positioned at different locations. This segmentation approach divides the light blocking function into discrete, controlled regions, allowing precise control over light paths to eliminate image superimposition while maintaining manufacturing feasibility.
2Manufacturing precision
If the opening sizes are made different to prevent image mixing, then image quality improves, but manufacturing difficulty increases
Solution Approach 1:
The patent applies different opening sizes locally at different positions in the light blocking layer. By confining the complexity to specific local regions rather than the entire structure, the manufacturing process remains relatively simple while still achieving the goal of preventing image superimposition and mixing.
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 improves image quality by reducing image superimposition and mixing, enhancing color gamut, and minimizing the thickness of the display device.
Implementation Method 1
a liquid crystal lens controller receiving information on a binocular distance of a user in a first direction and controlling the lens layer
Implementation Method 2
a lens layer disposed on the color filter layer
Data Source
AI summary
A display device includes a substrate, a first electrode disposed on the substrate, a light emitting layer disposed on the first electrode, a second electrode disposed on the light emitting layer, a color filter layer disposed on the second electrode, a lens layer disposed on the color filter layer, and a light blocking layer disposed on the lens layer and having a plurality of openings in a display area of the substrate. The openings of the light blocking layer include a first opening disposed at a central portion of the display area and a second opening disposed at an outer portion of the display area. A size of the first opening is greater than a size of the second opening.