Dual Light-Shielding Layer Display Device for Leakage Control
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Solution Overview
Problem
Light leakage and light mixing issues in display panels due to spherical light interference between adjacent light-emitting structures, which are exacerbated by increasing the thickness of the black matrix to mitigate these problems.
Innovation Solution
A light-emitting device design featuring a substrate, active device, first and second light-shielding layers, a transparent electrode, a light-converting layer, and an electroluminescent structure, where the light-converting layer is located in a first opening with a depth of 4 to 10 microns and the electroluminescent structure is in a second opening with a depth of 0.5 to 2 microns, with specific opening width ratios to control light emission and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the black matrix is increased to reduce light interference, then light leakage and light mixing are alleviated, but the overall thickness of the display panel is increased
Solution Approach 1:
The patent divides the light-shielding function into two separate layers: a first light-shielding layer on the array substrate and a second light-shielding layer on the color filter substrate. Each layer has openings positioned to allow light emission while blocking stray light. This segmentation allows effective light control without requiring a single thick black matrix, thereby reducing the overall panel thickness while preventing light leakage and mixing.
Solution Approach 2:
Instead of solving the light interference problem by increasing thickness in one dimension, the patent uses the dimensional arrangement of corresponding openings in two separate layers. The openings are positioned to align with the light emission path while the light-shielding portions block oblique light rays. This approach controls light interference through spatial positioning in multiple dimensions rather than relying on increased material thickness.
2Object-affected harmful factors
If the thickness of the black matrix is increased to prevent light interference, then light mixing between adjacent light-emitting structures is reduced, but the manufacturing complexity increases
Solution Approach 1:
The light-shielding function is segmented into two layers with corresponding openings. The first light-shielding layer is formed on the array substrate and the second light-shielding layer is formed on the color filter substrate. This segmentation distributes the light-shielding function across multiple components, making the overall structure more manageable and easier to manufacture compared to a single thick black matrix, while still effectively preventing light 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
Effectively alleviates light leakage and light mixing while maintaining a reduced overall panel thickness by optimizing the placement and dimensions of light-shielding layers and light-emitting structures to control light emission and conversion.
Implementation Method 1
a light-converting layer, an electroluminescent structure... The light-converting layer is substantially located in the first opening. The electroluminescent structure is substantially located in the second opening
Data Source
AI summary
A light-emitting device includes a substrate, an active device, a first light-shielding layer, a transparent electrode, a second light-shielding layer, a light-converting layer, an electroluminescent structure, and a top electrode. The active device is located on the substrate. The first light-shielding layer is disposed on the active device and has a first opening. The transparent electrode is located on the first light-shielding layer and electrically connected to the active device. The second light-shielding layer is located on the transparent electrode and has a second opening corresponding to the first opening. The light-converting layer is substantially located in the first opening. The electroluminescent structure is substantially located in the second opening. The transparent electrode is located between the first opening and the second opening. The electroluminescent structure is located between the top electrode and the transparent electrode.