Display Light Source Pitch Optimization for Moiré Reduction
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Solution Overview
Problem
Display apparatuses suffer from moiré phenomena and brightness non-uniformity due to the arrangement of light sources.
Innovation Solution
The display apparatus is designed with a specific arrangement of light sources, including edge light sources and biased lighting elements, where the interval between biased lighting elements and the pitch between light source substrates are optimized to satisfy a predetermined ratio, enhancing brightness uniformity and reducing moiré effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light sources are arranged in a conventional manner, then the device complexity is reduced, but moiré phenomena occur and brightness uniformity deteriorates
Solution Approach 1:
The light source array is segmented into multiple groups (first light source group, second light source group, third light source group) with different configurations. Each group has specific pitch relationships (P1, P2, P3) that are designed to avoid moiré interference patterns. This segmentation allows complex anti-moiré functionality to be achieved through modular group arrangements rather than a single complex configuration.
Solution Approach 2:
Different regions of the light source array have different local characteristics. The first light source group has a specific pitch P1, the second group has pitch P2, and the third group has pitch P3. Each local region is optimized with specific pitch values to control light distribution and prevent moiré effects in different areas of the display, achieving local optimization that contributes to global brightness uniformity.
2Illumination intensity
If light sources are arranged with standard spacing, then manufacturing is simplified, but brightness uniformity deteriorates
Solution Approach 1:
The patent employs multiple different pitch parameters (P1, P2, P3) for different light source groups instead of a single uniform pitch. By changing the spacing parameters across different groups, the light distribution pattern is optimized to achieve uniform brightness across the display area. This parameter variation approach transforms a simple manufacturing task into a precisely controlled multi-parameter system that delivers superior optical performance.
3Manufacturing precision
If light source pitch is increased, then manufacturing precision requirements are reduced, but moiré phenomena worsen
Solution Approach 1:
The solution moves from a one-dimensional uniform pitch approach to a two-dimensional multi-pitch configuration. By introducing different pitch values (P1, P2, P3) across different groups of light sources, the system creates a more complex spatial arrangement that disrupts the formation of moiré patterns. This dimensional complexity in the pitch arrangement effectively suppresses moiré effects while maintaining manufacturable precision levels.
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 optimized arrangement reduces moiré phenomena and improves brightness uniformity by ensuring the full width at half maximum of the light sources and the distance between substrates fall within a predetermined range.
Implementation Method 1
a liquid crystal display device includes a liquid crystal display panel which controls orientation of liquid crystal molecules
Data Source
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AI summary
A display device comprises a light source, a display panel and an optical sheet. The light source comprises a first light source substrate, and a second light source substrate spaced apart from the first light source substrate in the widthwise direction. The light source is loaded in a light source module, and the width of an area, defined as being half the maximum brightness of a light profile of the light source, is set as the full width at half maximum of the maximum brightness. The distance between the center of the first light source substrate in the widthwise direction and the center of the second light source substrate in the width direction can be referred to as a pitch, and the full width at half maximum of the maximum brightness of the light source and the pitch satisfy the following. 1.0 ≤ full width at half maximum of maximum brightness/pitch ≤ 2.0