Backlight LED Arrangement for Uniform Light Distribution
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Solution Overview
Problem
Backlight devices using LED light sources face challenges in achieving uniform light distribution due to the arrangement of RGB LED chips, leading to color shading and absorption losses, especially when multiple chips are concentrated at the center of a lens, resulting in disuniform light distribution.
Innovation Solution
The solution involves arranging multiple LED chips of different colors in specific configurations, such as paired lenses with LEDs connected in series or parallel, and strategically displacing them from the central axis to ensure uniform light distribution, using a combination of lenses and wiring boards to manage light emission and absorption effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple LED chips are concentrated at the center of a lens, then the light convergence is improved, but the light distribution becomes disuniform and color shading occurs
Solution Approach 1:
The patent divides the light source arrangement into multiple discrete LED chips positioned at specific locations around the lens periphery rather than concentrating them at the center. This segmentation allows each chip to contribute to different regions of the light output, achieving both convergence and uniform distribution.
Solution Approach 2:
The patent applies different positioning strategies for different LED chips based on their function. Chips are positioned at specific peripheral locations optimized for their color output and light distribution requirements, rather than using a uniform central arrangement for all chips.
2Device complexity
If multiple LED chips are arranged on the center axis of a single lens, then the structure is simplified, but the RGB colors cannot be properly mixed due to limited central positioning
Solution Approach 1:
The patent transitions from a one-dimensional central axis arrangement to a two-dimensional peripheral arrangement around the lens. By positioning chips at multiple angular positions around the lens periphery, the system achieves better color mixing and light distribution while maintaining a relatively simple single-lens structure.
3Manufacturing precision
If LED chips are displaced from the central position, then the light distribution uniformity is improved, but the absorption loss increases
Solution Approach 1:
The patent incorporates optical design elements that pre-compensate for potential light loss. The lens geometry and chip positioning are optimized in advance to guide light efficiently from the peripheral chip locations to the target area, minimizing absorption losses before they occur.
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
This configuration ensures uniform light distribution across the liquid crystal display panel, reducing color shading and absorption losses, thereby improving the overall brightness and color accuracy of the image display apparatus.
Implementation Method 1
a first LED having a first light emission color, a second LED having a second light emission color, a third LED having a third light emission color, a fourth LED having the third light emission color, a fifth LED having the second light emission color and a sixth LED having the first light emission color, and wherein the first, second, third, fourth, fifth and sixth LEDs are arranged in such a manner as to distribute the emitted light uniformly
Implementation Method 2
The back light device using a LED light source module
Data Source
AI summary
The liquid crystal display apparatus includes a liquid crystal panel and the back light device for emitting the light from a light source to the liquid crystal panel through a lens. The light source includes a first LED for emitting the light of a first color, a second LED for emitting the light of a second color, a third LED for emitting the light of a third color, a fourth LED for emitting the light of the third color, a fifth LED for emitting the light of the second color, and a sixth LED for emitting the light of the first color. The first, second, third, fourth, fifth and sixth LEDs are arranged on the wiring board in such a manner as to offset the deviation of the light distribution.