HMD Louver Structure for Uniform Brightness and Ghost Reduction
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Solution Overview
Problem
Existing methods for manufacturing louvers for head-mounted displays result in uneven display brightness and varying external-light ghost reduction effects due to shape irregularities in the light blocking layer, which are exacerbated by the louver's proximity to the user's eye.
Innovation Solution
A louver design comprising transparent first and second members with light blocking portions, featuring convex or concave structures that are precisely formed to minimize shape variations, ensuring uniform light blocking and display brightness across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a louver is manufactured by spraying black paint on a transparent base layer using a spray nozzle, then the manufacturing process is simple and easy to implement, but the shape of the light blocking layer becomes irregular, causing uneven display brightness and varying external-light ghost reduction effects
Solution Approach 1:
The patent applies preliminary action by forming convex portions on the transparent base layer before applying the light blocking material. These pre-formed convex structures guide the paint application process, ensuring that the light blocking layer conforms to the desired shape with high precision while maintaining manufacturing simplicity.
Solution Approach 2:
The convex portions act as an intermediary structure between the transparent base layer and the light blocking material. This intermediary feature ensures uniform thickness and precise shape of the light blocking layer, resolving the contradiction between easy manufacturing and high shape precision.
2Volume of moving object
If the louver is positioned close to the user's eye to improve the field of view, then the device compactness is improved, but shape irregularities in the light blocking layer are exacerbated, worsening display uniformity
Solution Approach 1:
By pre-forming convex portions on the base layer, the patent ensures that the light blocking layer maintains its precise shape even when the louver is positioned close to the user's eye. This preliminary structuring prevents shape irregularities from being exacerbated by the compact positioning.
Solution Approach 2:
The patent applies local quality by creating specific convex portions at strategic locations on the transparent base layer. These localized structural features ensure that the light blocking layer maintains uniform thickness and precise shape in critical areas, compensating for the challenges posed by compact positioning near the user's eye.
3Manufacturing precision
If convex portions are formed on the transparent base layer to ensure uniform light blocking, then the display brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The convex portions are formed as preliminary structures on the transparent base layer, which simplifies the subsequent light blocking material application process. Rather than requiring complex post-processing to achieve uniformity, the preliminary convex structures guide the material to self-align, reducing overall device complexity while maintaining high display brightness uniformity.
Data Source
AI summary
A louver includes a first member made of transparent material, a second member made of transparent material, and a plurality of light blocking portions made of light blocking material. The first member and the second member are configured to join with each other. A first main surface of each of the plurality of light blocking portions is in contact with the first member and a second main surface of each of the light blocking portions is in contact with the second member. The first member includes convex portions, each of the convex portions being configured to project from the first main surface of one of the plurality of light blocking portions toward a center line of the louver. One end surface of each of the plurality of light blocking portions in a direction along the center line is in contact with one of the convex portions.