Backlight Unit Reflective Structure for Luminance Uniformity
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Solution Overview
Problem
Conventional backlight units for LCDs, particularly those using Cold Cathode Fluorescent Lamps (CCFLs), face issues with high power consumption, low color reproduction efficiency, and environmental pollution due to mercury usage, necessitating a more efficient and environmentally friendly solution.
Innovation Solution
A backlight unit design incorporating a reflective structure without a light guide plate, featuring a first and second reflector with an inclined surface, a light source module, and a reflective structure on the second reflector, which creates an air guide to enhance luminance and reduce power consumption by using Light Emitting Diodes (LEDs) as light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used to uniformly diffuse light, then luminance uniformity is improved, but device complexity and weight increase
Solution Approach 1:
The patent removes the light guide plate from the backlight unit structure, replacing it with a reflective structure that directly reflects light from LED sources to achieve uniform illumination without the need for separate light diffusing components
Solution Approach 2:
The reflective structure serves multiple functions simultaneously: it reflects light to achieve uniform luminance distribution, provides structural support, and eliminates the need for separate light guide plates, thereby reducing overall device complexity
2Illumination intensity
If CCFL is used as light source, then high luminance is achieved, but power consumption increases
Solution Approach 1:
The patent transitions from CCFL to LED light sources, changing the fundamental operating parameters of the lighting system to achieve lower power consumption while maintaining or improving luminance output through efficient LED conversion
3Illumination intensity
If CCFL is used as light source, then high luminance is achieved, but color reproduction efficiency deteriorates
Solution Approach 1:
The patent changes the light source technology from CCFL to LED, which enables superior color reproduction efficiency with over 100% NTSC color gamut coverage, while maintaining high luminance levels required for display applications
4Illumination intensity
If CCFL is used as light source, then high luminance is achieved, but environmental pollution increases
Solution Approach 1:
The patent eliminates the harmful mercury substance from the lighting system by replacing CCFL with LED technology, converting an environmentally harmful system into a sustainable one that maintains high luminance without toxic byproducts
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 design achieves improved luminance uniformity, reduced power consumption, and environmental sustainability by eliminating mercury usage, while providing a cost-effective and reliable backlight solution for large-scale displays.
Implementation Method 1
a reflective structure disposed on the second reflector... The reflective structure may include a reflective part to reflect light
Data Source
AI summary
Disclosed herein are a backlight unit and a display apparatus using the same. The backlight unit includes a first reflector, a second reflector partially having an inclined surface, at least one light source module disposed between the first and second reflectors, and at least one reflective structure disposed on the second reflector.