Spacer Configuration for Uniform Brightness in VR Displays
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Solution Overview
Problem
Conventional display devices using dot-shaped spacers for maintaining cell gap face issues of insufficient support and non-uniform brightness due to varying shielding ratios of dot-shaped light shielding patterns, which can cause black points in virtual reality applications.
Innovation Solution
The design includes a spacer directly in contact with the common electrode layer and overlapping with the contact hole, providing increased support and uniform brightness by ensuring the spacer's shape, such as rectangular, matches the shielding ratio of adjacent pixel regions, eliminating the need for dot-shaped light shielding patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dot-shaped spacers are used to maintain cell gap, then cell gap maintenance function is achieved, but support strength is insufficient
Solution Approach 1:
The spacer structure is divided into multiple segments: a first spacer portion extending from the first substrate, a second spacer portion extending from the second substrate, and a connection portion linking them. This segmentation distributes the support function across multiple structural elements, enhancing overall support strength while maintaining cell gap stability.
Solution Approach 2:
The spacer is constructed as a composite structure combining different material properties: the first and second spacer portions provide mechanical support, while the connection portion ensures structural integrity. This composite approach strengthens the spacer's ability to maintain cell gap without collapsing.
2Object-affected harmful factors
If dot-shaped light shielding patterns are used, then spacer shielding is achieved, but brightness uniformity deteriorates
Solution Approach 1:
The light shielding pattern transitions from a dot-shaped two-dimensional pattern to a line-shaped pattern that extends across multiple pixel regions. This dimensional change allows the shielding pattern to uniformly cover adjacent pixel regions, ensuring consistent brightness across the display while maintaining effective spacer shielding.
3Object-affected harmful factors
If dot-shaped light shielding patterns are used, then spacer shielding is achieved, but virtual reality image quality deteriorates
Solution Approach 1:
The light shielding pattern is extended from dot-shaped to line-shaped, creating a continuous shielding structure that spans multiple pixel regions. This eliminates the black points caused by dot-shaped patterns in virtual reality displays while maintaining effective shielding of the spacer structure.
4Ease of manufacture
If conventional spacer configuration is used, then manufacturing simplicity is maintained, but spacer supportability is insufficient
Solution Approach 1:
The spacer is segmented into multiple portions (first spacer portion, second spacer portion, and connection portion) that can be formed through sequential deposition processes. This segmentation allows each portion to be optimized for supportability while maintaining manufacturability through standard fabrication techniques.
Solution Approach 2:
The first and second spacer portions are formed on the first and second substrates respectively before the connection portion is added. This preliminary formation ensures that the support structure is built up in stages, with each stage providing necessary support while remaining compatible with existing manufacturing processes.
Data Source
AI summary
A substrate assembly includes a substrate, a drain, a second drain, a first insulating layer, a first electrode, a second electrode, an electrode layer and a spacer. The first insulating layer disposed on the first drain and the second drain, having a first contact hole and a second contact hole. The first electrode disposed on the first insulating layer and electrically connected to the first drain via the first contact hole, the second electrode disposed on the first insulating layer and electrically connected to the second drain via the second contact hole. The spacer disposed on the first electrode and the second electrode, a first portion of the spacer is disposed in the first contact hole, a second portion of the spacer is disposed in the second contact hole, and the first portion and the second portion are continuous, in a top view, the spacer includes an arc shape.