Display Substrate Photo Spacer Alignment for Light Leakage Reduction
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Solution Overview
Problem
Current display technologies using OLEDs or QLEDs with thin film transistors face challenges in achieving optimal light emission and structural integrity, particularly in the design and manufacturing of display substrates.
Innovation Solution
The display substrate incorporates multiple pixel light emitting regions and spacer regions, featuring a light emitting structure layer with an anode, pixel definition layer, and photo spacers. The photo spacers are strategically positioned within spacer openings and are surrounded by a groove, ensuring proper alignment and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If photo spacers are positioned within spacer openings in the pixel spacer regions, then light emission efficiency is improved, but structural complexity increases
Solution Approach 1:
The display substrate is divided into pixel light emitting regions and pixel spacer regions, with photo spacers specifically positioned in the spacer regions. This segmentation allows the photo spacers to be strategically placed only where needed for light emission optimization, rather than uniformly across the entire substrate, thus improving light emission efficiency while controlling structural complexity through targeted placement.
Solution Approach 2:
Photo spacers are introduced specifically in the pixel spacer regions between adjacent pixel light emitting regions, creating local optical optimization zones. This local quality approach enhances light emission in specific areas where spacers are positioned without requiring complex structures throughout the entire display substrate, balancing performance improvement with manufacturing feasibility.
2Object-generated harmful factors
If photo spacers are surrounded by a groove, then light leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
A groove structure is introduced as an intermediary element surrounding the photo spacers in the pixel spacer regions. This groove acts as a light-blocking barrier that prevents light leakage from the spacers, while its design allows for standard manufacturing tolerances, avoiding excessive precision requirements that would complicate the manufacturing process.
3Stability of the object's composition
If the orthographic projection of photo spacer is within the spacer opening, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The photo spacers are pre-positioned within the pixel spacer regions during the manufacturing process, with their orthographic projections confined within the spacer openings. This preliminary positioning ensures structural integrity from the outset, preventing light leakage and maintaining substrate stability without requiring complex post-manufacturing adjustments or additional structural elements.
Data Source
AI summary
A display substrate, a manufacturing method therefor and a display device are provided. The display substrate includes pixel light emitting regions and pixel spacer regions between adjacent pixel light emitting regions; in a plane perpendicular to the display substrate, the display substrate includes a base substrate and a light emitting structure layer on the base substrate, the light emitting structure layer at least includes an anode, a pixel definition layer and at least one photo spacer, a pixel opening is provided in the pixel definition layer in each pixel light emitting region, the pixel opening exposes the anode, a spacer opening is provided in the pixel definition layer in the pixel spacer region, the photo spacer is provided in the spacer opening, and an orthographic projection of the photo spacer on the base substrate is within a range of an orthographic projection of the spacer opening on the base substrate.