L-Shaped Light Guide Plate for Thin LCD Backlight
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Solution Overview
Problem
Conventional edge-lighting backlight modules in LCDs face challenges in reducing thickness and achieving uniform light intensity due to the fixed thickness of the light source, leading to non-uniform brightness.
Innovation Solution
A light guide plate design with a first portion and a second portion, featuring L-shaped light input and output surfaces and reflection surfaces, allows for the placement of the light source in a receiving space adjacent to the light input surface, enabling twice-reflection of light to the output surface, thus reducing the total thickness and enhancing light uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light source is disposed at one side of the light guide plate in conventional edge-lighting backlight modules, then the structure is simple, but the total thickness of the display apparatus cannot be reduced below the fixed thickness of the light source
Solution Approach 1:
The patent changes the spatial arrangement from a conventional linear configuration to a folded L-shaped configuration. The light guide plate is divided into a first portion and a second portion that are folded relative to each other, creating a three-dimensional spatial arrangement that reduces the overall thickness while maintaining the necessary optical path length.
Solution Approach 2:
The second portion of the light guide plate is folded back and positioned within the spatial envelope created by the first portion, effectively nesting parts of the optical system within itself. This allows the light to travel a longer path through the light guide plate without increasing the external dimensions.
2Illumination intensity
If the light source is disposed close to the light guide plate, then the structure is compact, but the light intensity is higher near the light source resulting in non-uniform brightness
Solution Approach 1:
By folding the light guide plate into an L-shape configuration, the patent increases the effective distance between the light source and the display panel in the optical path direction while maintaining compact overall dimensions. The light travels through the second portion which is folded back, creating a longer illumination path that allows for more uniform light distribution.
3Illumination intensity
If the light guide plate uses conventional linear configuration, then the manufacturing is simple, but it is difficult to achieve both thin profile and uniform light distribution
Solution Approach 1:
The light guide plate is segmented into distinct portions - a first portion and a second portion - that are folded relative to each other. This segmentation allows each portion to be optimized for specific functions while maintaining manufacturability through standard molding techniques for the overall structure.
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 effectively reduces the total thickness of the display apparatus and improves light uniformity by guiding light efficiently through the use of reflection surfaces, preventing non-uniform brightness issues.
Implementation Method 1
the first reflection surface is configured to reflect the light inputted from the light input surface to the second reflection surface
Implementation Method 2
the second reflection surface is configured to reflect the light reflected from the first reflection surface to the first portion
Data Source
AI summary
A light guide plate and a display apparatus are disclosed. The light guide plate comprises a first portion and a second portion. The first portion includes a light output surface. The second portion is formed on one end of the first portion to guide light into the first portion, wherein the second portion includes a light input surface adjacent to at least one light source, a first reflection surface and a second reflection surface adjacent to the first reflection surface, and the light input surface and the light output surface are substantially in the form of an L-shape. The light guide plate is applicable to the display apparatus.