Backlight Unit Brightness Uniformity via Localized LED Arrangement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices with LED backlights face challenges in achieving uniform brightness due to random arrangement of LEDs with varying luminous flux, resulting in inadequate brightness, particularly in the central portion of the image.
Innovation Solution
The solution involves arranging light sources with higher brightness closer to the center and those with lower brightness towards the periphery of the backlight unit's cover bottom, along with supplementary light source groups to reduce brightness differences between adjacent groups, and utilizing optical components like diffusing and prism sheets to enhance brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light sources are arranged randomly in the backlight unit, then the device complexity is reduced, but the brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by dividing the backlight unit into multiple regions (first, second, third regions) with different light source arrangements. Each region has specific light sources positioned at designated locations rather than random placement, creating localized brightness optimization that contributes to overall uniformity across the display panel.
2Adaptability or versatility
If light sources with different luminous fluxes are used, then the adaptability of the backlight unit is improved, but the brightness uniformity deteriorates
Solution Approach 1:
The patent uses light sources with different luminous fluxes (first, second, third light sources with different characteristics) and positions them in specific regions. This local differentiation allows the system to adapt to varying brightness requirements across different areas of the display while maintaining overall uniformity through strategic placement.
3Ease of manufacture
If the central portion of the display has insufficient brightness, then the ease of manufacture is improved, but the illumination intensity deteriorates
Solution Approach 1:
The patent specifically addresses the central region by placing particular light sources (first and second light sources) in the first and second regions which are positioned to illuminate the central portion of the display panel. This localized arrangement ensures adequate central brightness without requiring complex manufacturing processes.
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 increases the overall brightness of the backlight unit by up to 30% compared to random LED arrangements, providing more uniform illumination and enhancing the display's image quality.
Implementation Method 1
a plurality of light sources LED which emit a light toward the liquid crystal display panel
Implementation Method 2
a reflective plate formed on an inside bottom surface of the cover bottom for reflecting the light from the light sources upward
Implementation Method 3
a diffusing plate positioned over the light sources for diffusing the light from the light sources
Data Source
AI summary
A backlight unit includes a cover bottom having a plurality of light source groups each with a plurality of light sources thereon, wherein the light sources with the higher brightness are arranged in the light source group closer to a center portion of the cover bottom, and the light sources with the lower brightness are arranged in the light source group closer to a periphery of the cover bottom.