Backlight Unit Light Source Block Arrangement for Uniformity
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Solution Overview
Problem
Conventional backlight units for liquid crystal displays often suffer from non-uniform light emission, leading to inconsistencies in display quality due to the positioning and arrangement of light sources.
Innovation Solution
A backlight unit design featuring alternating first and second light source blocks with varying distances between light sources, where the first light source block has decreasing distances towards its ends and the second block has increasing distances, is used in conjunction with a reflective sheet to ensure uniform light distribution across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are arranged in a conventional uniform pattern, then the device complexity is low, but the light uniformity deteriorates
Solution Approach 1:
The patent applies local quality by varying the distances between light sources within each light source block according to their position. Light sources closer to the center have smaller distances, while those near edges have larger distances. This non-uniform local arrangement compensates for light distribution patterns to achieve overall uniformity across the display panel.
Solution Approach 2:
The patent employs asymmetry by using two types of light source blocks with different distance patterns. The first light source block has distances that increase from center to edge, while the second block has distances that decrease from center to edge. These asymmetric patterns are alternately arranged to balance out light distribution and achieve uniformity.
2Illumination intensity
If alternating first and second light source blocks are used with varying distances, then the light uniformity improves, but the device complexity increases
Solution Approach 1:
The patent segments the light source array into multiple first and second light source blocks arranged in an alternating pattern. Each block contains a plurality of light sources with specific distance characteristics. This segmentation allows different blocks to compensate for each other's light distribution patterns, achieving overall uniformity while managing complexity through modular design.
Solution Approach 2:
The patent applies inversion by using two complementary light source block patterns where the first block has distances increasing from center to edge, and the second block has the inverse pattern with distances decreasing from center to edge. By alternating these inverted patterns, the patent balances light distribution to achieve uniformity.
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 enhances the uniformity of light travel to the display panel, thereby improving the overall display quality by minimizing brightness differences across the screen.
Implementation Method 1
a reflective sheet disposed under the first and second light source blocks
Data Source
AI summary
A backlight unit includes a light source part configured to emit a light and a reflective sheet disposed under the light source part. The light source part includes a first light source block including a plurality of light sources with first distances therebetween and a second light source block including a plurality of light sources with second distances therebetween. The first distances increase or decrease as the light sources of the first light source block are closer to an end portion of the first light source block than to a center portion of the first light source block, and the second distances increase as the light sources of the second light source block axe closer to an end portion of the second light source block than to a center portion of the second light source block.