Backlight Retaining Wall Geometry for Halo Reduction
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Solution Overview
Problem
Electronic devices with direct-type backlight modules face issues such as halo phenomena, poor light output efficiency, and obvious dark pattern areas, which affect display quality.
Innovation Solution
The electronic device incorporates a substrate with first and second retaining walls and a light emitting element, where the second distance between the light emitting element and the second retaining wall is smaller than the first distance between the light emitting element and the first retaining wall, improving light output efficiency and alleviating display quality issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a direct-type backlight module is used to improve contrast and resolution, then display resolution and contrast are improved, but halo phenomena and dark pattern areas occur
Solution Approach 1:
The patent applies local quality by creating different distance relationships between the light emitting element and different retaining walls. Specifically, the light emitting element is positioned closer to the second retaining wall (which defines the light output area) than to the first retaining walls, creating non-uniform light distribution that eliminates halo effects while maintaining high resolution and contrast.
2Manufacturing precision
If the size of the diode is adjusted to improve resolution, then display resolution is improved, but light output efficiency deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the light emitting element arrangement, specifically the distances to different retaining walls. By positioning the light emitting element closer to the second retaining wall, the light output efficiency is improved without changing the diode size, thus maintaining high resolution while reducing energy loss.
Data Source
AI summary
An electronic device includes a substrate, a plurality of first retaining walls, a second retaining wall, and a light emitting element. The first retaining walls are arranged on the substrate. The second retaining wall is arranged on the substrate and disposed within one of the first retaining walls. The light emitting element is arranged on the substrate and disposed between the second retaining wall and one of the first retaining walls adjacent to the second retaining wall. In a cross section, there are a first distance between the light emitting element and the one of the first retaining walls, and a second distance between the light emitting element and the second retaining wall, wherein the second distance is smaller than the first distance.