Backlight Unit Non-Uniform LED Spacing for LCD Corner Brightness
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Solution Overview
Problem
Conventional direct light type backlight units experience brightness uniformity issues due to insufficient light distribution at the corners, resulting in dark areas, which affects the overall image quality of liquid crystal display (LCD) devices.
Innovation Solution
The backlight unit is designed with light-emitting device units arranged more densely at the edges than at the center of the base plate, with varying interval lengths, and includes a combination of transmissive and reflective diffusion plates, collimators, and polarization enhancement films to improve light distribution and directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged in a two-dimensional array at equal intervals on a PCB substrate, then the arrangement is simple and manufacturing is easy, but the four corners of the backlight unit appear dark due to shortage of light
Solution Approach 1:
The patent applies local quality by varying the arrangement density of light sources across different regions of the backlight unit. Specifically, the light sources are arranged more densely near the four corners and less densely in the center region, creating non-uniform local distribution that compensates for the natural light shortage at corners while maintaining overall manufacturing simplicity
Solution Approach 2:
The patent employs asymmetry by breaking the uniform equal-interval arrangement pattern and creating an asymmetric density distribution where corner regions have higher light source density compared to the center. This asymmetric arrangement specifically targets the corner brightness issue without requiring complete redesign of the entire array
2Illumination intensity
If light sources are arranged more densely at edges than at center, then corner brightness is improved, but the arrangement complexity increases
Solution Approach 1:
The patent resolves the complexity issue by applying local quality only to specific regions (corner areas) while maintaining simpler arrangements in other regions (center area). This localized approach improves corner brightness without making the entire arrangement complex, as only portions of the light source array require non-uniform spacing
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 arrangement enhances brightness uniformity across the LCD screen, preventing dark areas at the corners and improving the overall image quality by increasing light coverage without additional manufacturing costs.
Implementation Method 1
a plurality of light-emitting device units (10) arranged on a base plate (101) with varying arrangement intervals
Implementation Method 2
a combination of transmissive and reflective diffusion plates
Implementation Method 3
collimators, and polarization enhancement films to improve light distribution and directionality
Implementation Method 4
polarization enhancement films to improve light distribution and directionality
Data Source
AI summary
A backlight unit including a plurality of light-emitting device units with varying arrangement intervals such that the light-emitting device units are more densely arranged at edges of a base plate than at center thereof, and a liquid crystal display (LCD) apparatus employing the same. The backlight unit is designed to prevent creation of dark portions on corners due to a shortage in an amount of light, thereby providing improved brightness uniformity.