Integrated Light Guide Plate for Thin LCD Backlight Modules
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Solution Overview
Problem
Conventional edge light backlight modules have a complex structure and assembly process, making it difficult to achieve a lightweight and thin liquid crystal display module.
Innovation Solution
A light guide plate with a substrate, a first refractive index layer featuring prism-structured netted dots, a second refractive index layer, and a reflective layer, which integrates the backlight module into the liquid crystal panel, simplifying assembly and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional edge light backlight module uses independent optical films (reflector, light guide plate, diffuser, prism), then optical functions are achieved, but structure becomes complicated and assembly process becomes complex
Solution Approach 1:
The patent merges the reflector, light guide plate, diffuser, and prism into a single integrated light guide plate. The light guide plate includes a substrate with a reflective layer on the first surface and a roughened second surface that acts as both the light extraction surface and the diffuser/prism surface, eliminating the need for separate optical films and simplifying the overall structure.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: the reflective layer on the first surface acts as a reflector, the substrate guides light, and the roughened second surface provides both light extraction and diffuser/prism functions. This multi-functionality reduces the number of components needed in the display device.
2Reliability
If conventional edge light backlight module uses multiple independent optical films, then optical performance is maintained, but thickness and weight increase
Solution Approach 1:
By combining multiple optical films into a single light guide plate structure, the overall thickness is reduced. The integrated design eliminates the cumulative thickness of separate reflector, light guide plate, diffuser, and prism layers while maintaining their combined optical functions through the substrate and surface treatments.
3Reliability
If conventional edge light backlight module uses independent optical films, then light guidance and distribution are achieved, but assembly process becomes complex and time-consuming
Solution Approach 1:
The integration of multiple optical functions into a single light guide plate component simplifies the assembly process. Instead of assembling multiple separate optical films in a specific sequence, the manufacturer only needs to install one integrated light guide plate that already contains all necessary optical elements, reducing assembly complexity and production time.
4Reliability
If conventional edge light backlight module uses multiple separate components, then optical functions are fulfilled, but the display device becomes heavier
Solution Approach 1:
By merging multiple optical films into a single integrated light guide plate, the total weight of optical components is reduced. The consolidated structure eliminates redundant materials and interfaces, resulting in a lighter overall display device while maintaining all necessary optical functions through the substrate and surface treatments.
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 integrated design reduces the thickness of the liquid crystal display module, functions as a single light guide, diffuser, and reflector, and allows direct use as a substrate for color filters or thin film transistors, enabling thinner and more lightweight displays.
Implementation Method 1
A first refractive index layer including a plurality of prism structures, wherein the plurality of prism structures are distributed on an emergence surface to form prism-structured netted dots
Implementation Method 2
the second refractive index layer has a second refractive index n2, and the second refractive index n2 is less than a refractive index of the substrate no
Implementation Method 3
A reflective layer disposed on a surface of the substrate opposite to the first refractive index layer
Data Source
AI summary
A light guide plate including a substrate; a first refractive index layer; a second refractive index layer stacked on the first refractive index layer, and a reflective layer disposed on a surface of the substrate opposite to the first refractive index layer, wherein the first refractive index layer is a structure of a plurality of prisms distributed on an emergence surface of the substrate, forming prism-structured netted dots. Through disposing the prism-structured netted dots, the reflective layer, and the second refractive index layer on the light guide plate substrate, and using refraction and reflection of each layer to realize adjustment of emergence angle, a function of an independent diffuser, prism, and reflector is realized. The light guide plate is used as CF or TFT substrate to manufacture a liquid crystal display, and a backlight module is integrated into a liquid crystal panel, decreasing a thickness of a liquid crystal module.