Display Light Source Module Substrate Spacing Moiré Reduction
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Solution Overview
Problem
Display apparatuses face issues with the moiré phenomenon and brightness uniformity due to non-uniform light distribution from light sources, which affects image quality.
Innovation Solution
The display apparatus incorporates a light source module with elongated substrates spaced apart to optimize the full width at half maximum brightness and pitch ratio, ensuring that the interval between biased lighting elements and edge light sources is carefully controlled to reduce moiré effects and enhance brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light sources are arranged with larger spacing to reduce moiré phenomenon, then moiré effect is reduced, but brightness uniformity deteriorates
Solution Approach 1:
The light source module is segmented into multiple light source substrates (first light source substrate and second light source substrate) with elongated shapes, where each substrate contains multiple lighting elements. This segmentation allows for optimized spacing between substrates to reduce moiré while maintaining brightness uniformity through the distributed arrangement of light sources.
Solution Approach 2:
Different regions of the light source module have different lighting element arrangements. The first and second light source substrates are positioned at specific pitch distances from each other, and edge light sources are placed at specific intervals from biased lighting elements. This local optimization of light source distribution achieves both moiré reduction and brightness uniformity in different areas of the display panel.
2Illumination intensity
If light sources are arranged with smaller spacing to improve brightness uniformity, then brightness uniformity is improved, but moiré phenomenon worsens
Solution Approach 1:
The patent optimizes specific parameters including the pitch distance between first and second light source substrates, and the interval between edge light sources and biased lighting elements. By carefully controlling these dimensional parameters within specific ranges, the system achieves the optimal balance between brightness uniformity and moiré reduction, transforming the light distribution characteristics to satisfy both requirements simultaneously.
Data Source
AI summary
A display apparatus including a light source; a display panel; an optical sheet. The light source including a first light source substrate and a second light source substrate spaced apart from the first light source substrate in a width direction. The light source is mounted on the light source module and a width of a region defined by half of a maximum brightness of a light profile of the light source, is set as a full width at half maximum brightness. A distance between a center of the first light source substrate in the width direction and a center of the second light source substrate in the width direction is referred to as a pitch, the full width at half maximum brightness of the light source and the pitch satisfy: 1.0≤full width at half maximum brightness/pitch≤2.0.