Integrated Backlight Illumination Assembly for LCD Displays
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Solution Overview
Problem
Conventional backlight solutions for larger LCD displays face challenges such as poor color and brightness uniformity, high heat issues, and inefficiency, particularly with cold cathode fluorescent light sources, which are also environmentally problematic due to mercury content. Additionally, they fail to meet requirements for high-quality color imaging and compact, low-cost assembly.
Innovation Solution
An integrated backlight illumination assembly using a substrate with a bottom reflector, solid-state light sources, light films with redirecting areas, and a top diffuser, which provides improved color mixing and uniformity, and is scalable for larger displays, reducing the need for thick light guide plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional CCFL light sources are used for backlighting, then the display can be backlit, but the solution becomes thick, inefficient, and environmentally problematic
Solution Approach 1:
The patent extracts the light guide plate from the conventional backlight structure and replaces it with a thin film light guide. This removes the bulky component while maintaining the light guiding function, thereby reducing overall backlight thickness and complexity while preserving illumination capability.
Solution Approach 2:
The patent changes the physical parameters of the light guide from thick and rigid to thin and flexible. By transforming the light guide into a thin film structure with specific optical properties, the system achieves reduced thickness while maintaining light transmission and guiding functions.
2Illumination intensity
If CCFL light sources are used, then backlighting is achieved, but color uniformity and brightness uniformity become poor
Solution Approach 1:
The patent segments the light guide into multiple sections with different optical properties. By dividing the light guide structure into segments that can independently control light distribution, the system achieves improved brightness uniformity across the display while maintaining color consistency.
Solution Approach 2:
The patent introduces a light scattering layer as an intermediary between the light source and the display. This intermediate layer randomizes light paths and distributes brightness uniformly across the viewing area, correcting the uniformity problems of conventional CCFL backlighting.
3Reliability
If conventional LED array arrangements are used, then solid-state lighting is achieved, but color and brightness uniformity remain poor
Solution Approach 1:
The patent designs the thin film light guide to perform multiple functions simultaneously: light guiding, light scattering, color mixing, and brightness uniformization. By making the light guide multi-functional, the system achieves color and brightness uniformity without requiring separate components for each function.
Solution Approach 2:
The patent uses composite material structures in the thin film light guide, combining layers with different optical properties. This composite structure enables simultaneous control of light direction, scattering, and color mixing, achieving uniform color and brightness output from LED sources.
4Illumination intensity
If thick light guide plates are used to spread light, then light uniformity improves, but device thickness increases
Solution Approach 1:
The patent employs a thin film light guide structure that provides light uniformity through optimized optical properties rather than thickness. The thin film design incorporates scattering layers and optical patterns that achieve uniform light distribution while maintaining minimal thickness, eliminating the need for thick light guide plates.
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
The solution achieves high brightness, efficiency, and color uniformity, supporting expanded color gamut and is adaptable for various display sizes, including LCD TVs and medical displays, while being environmentally friendly and cost-effective.
Implementation Method 1
a bottom reflector provided on the substrate
Implementation Method 2
a plurality of light films having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading the point light source to a uniform plane of light
Implementation Method 3
a top diffuser for diffusing the uniform plane of light
Data Source
AI summary
The present invention provides an integrated backlight illumination assembly for an LCD display comprising, a substrate for providing structural and functional support to the assembly, a bottom reflector provided on the substrate and a plurality of solid state light sources provided in an opening of the bottom reflector for providing a point light source. Further, the invention provides a plurality of light films with a thickness between 10 microns to 3mm and having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading the point light source to a uniform plane of light and a top diffuser for diffusing the uniform plane of light, and wherein the plurality of light films has a thickness between .1 mm to 1.0 mm and a bending stiffness between 50 to 1200 millinewtons.