Light-Shielding Layer Thickness Variation for Display Pixel Apertures
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Solution Overview
Problem
Display devices using light-emitting diodes face issues with chromatic aberrations and low fabrication yield rates due to misalignment of light-emitting elements and difficulties in replacing dysfunctional elements, leading to increased costs from redundant installations.
Innovation Solution
A display device design featuring a circuit substrate with light-emitting elements arranged along a specific direction, a light-shielding layer with varying thickness patterns, and pixel apertures to reduce optical crosstalk and allow for easy replacement of faulty elements, enhancing both display quality and fabrication yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light-emitting elements are disposed on circuit substrate with SMD or COB configuration, then the display device can be manufactured, but chromatic aberrations occur when distances between light-emitting elements and pixel boundary differ, resulting in low displaying quality
Solution Approach 1:
A light-shielding layer is introduced as an intermediary component between the light-emitting elements and the surrounding areas. This layer includes light-shielding patterns that precisely control light emission boundaries, preventing chromatic aberrations while maintaining the ease of SMD/COB manufacturing process. The light-shielding layer acts as a mediator that ensures optical precision without complicating the manufacturing approach.
2Productivity
If extra redundant light-emitting elements are installed to increase fabrication yield rate, then the fabrication yield rate increases, but production costs increase due to over-costing
Solution Approach 1:
The patent changes the structural parameters of the light-shielding layer, specifically varying the thickness of light-shielding patterns in different regions. This parameter variation enables precise control over light emission while using the exact number of light-emitting elements required, eliminating the need for redundant elements and reducing production costs without sacrificing fabrication yield rate.
3Manufacturing precision
If light-shielding layer with varying thickness patterns is used, then chromatic aberrations and optical crosstalk are reduced improving display quality, but device complexity increases
Solution Approach 1:
The light-shielding layer is segmented into multiple light-shielding patterns with different thicknesses, where each pattern is optimized for its specific function. This segmentation allows precise control of light emission to reduce chromatic aberrations and optical crosstalk, while the modular segmented structure actually simplifies the overall device design compared to a monolithic complex structure.
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 reduces chromatic aberrations and optical crosstalk, improves display quality, and increases the fabrication yield rate by allowing for efficient replacement of faulty elements without additional costs.
Implementation Method 1
The light-shielding layer is located on the circuit substrate and has a plurality of pixel apertures... The plurality of first light-shielding patterns have a first thickness, the plurality of second light-shielding patterns have a second thickness
Data Source
AI summary
A display device including a circuit substrate, a plurality of pixels, and a light-shielding layer is provided. The pixels include a plurality of light-emitting elements. The light-emitting elements are disposed on the circuit substrate and are electrically connected to the circuit substrate. The light-emitting elements in the pixels are arranged along an arrangement direction. The light-shielding layer is disposed on the circuit substrate and has a plurality of pixel apertures. The pixels are disposed in a corresponding pixel aperture. The light-shielding layer includes a plurality of first light-shielding patterns extending in the arrangement direction and a plurality of second light-shielding patterns connected to the first light-shielding patterns. The extending direction of the second light-shielding patterns is different from the extending direction of the first light-shielding patterns. A thickness of the first light-shielding patterns is greater than or substantially equal to a thickness of the second light-shielding patterns.