Light Guide Plate Prism Structure for Backlight Uniformity
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Solution Overview
Problem
Backlight modules in LCDs suffer from hot spot phenomena and non-uniform light distribution due to the direct opposition of light bars to the side surfaces of light guide plates, leading to poor optical quality.
Innovation Solution
Incorporating a prism structure with reflective surfaces at the light guide plate's end, which reflects incident light uniformly into the plate body, reducing the likelihood of hot spots and enhancing light uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light bars are directly opposed to the side surfaces of light guide plates, then the structure is simple, but hot spot phenomena occur and light uniformity deteriorates
Solution Approach 1:
The light guide plate is segmented into a first light guide plate and a second light guide plate, with the light incident surface divided between them. This segmentation allows the light bar to be positioned away from any single side surface, preventing direct opposition while maintaining structural simplicity. The light is distributed across multiple surfaces, improving uniformity without adding complex components.
Solution Approach 2:
The invention transitions from a single-side light incidence configuration to a multi-surface light incidence configuration. By arranging light incident surfaces on both the first and second light guide plates, the system moves from one-dimensional light distribution to two-dimensional distribution, eliminating hot spots while keeping the overall structure simple.
2Device complexity
If light incident surface is parallel to the side surface, then the structure is simple, but light uniformity deteriorates due to hot spots
Solution Approach 1:
The invention introduces asymmetry by positioning light incident surfaces on both the first and second light guide plates rather than maintaining a single parallel configuration. The light incident surface on the first light guide plate and the light incident surface on the second light guide plate are arranged asymmetrically relative to the light bar position, which prevents direct opposition and improves light uniformity while maintaining structural simplicity.
3Device complexity
If light is directly transmitted through the light guide plate, then the structure is simple, but optical quality deteriorates due to hot spots
Solution Approach 1:
The light guide plate is divided into first and second light guide plates with separate light incident surfaces. This segmentation allows light to be incident from multiple locations, distributing the light load and preventing hot spot formation. The segmented structure maintains simplicity while significantly improving optical quality through better light distribution.
Solution Approach 2:
The invention changes from single-surface light incidence to multi-surface light incidence, transitioning from one-dimensional to two-dimensional light distribution. This dimensional change eliminates direct light transmission paths that cause hot spots, improving optical quality while keeping the structure simple.
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 prism structure improves light uniformity and reduces the occurrence of hot spots, thereby enhancing the optical quality of the backlight module.
Implementation Method 1
the prism structure comprises a light incident surface and at least one reflective surface, and incident light from the light incident surface is reflected by the at least one reflective surface into the light guide plate body
Implementation Method 2
a light diffusion structure is arranged in the prism structure. The light diffusion structure comprises diffusion particles or bubbles
Data Source
AI summary
A light guide plate, a backlight module and a display device in the field of display technology are provided. The light guide plate includes a light guide plate body and a prism structure located at at least one end of the light guide plate body. The prism structure includes a light incident surface and at least one reflective surface, and incident light from the light incident surface is can be reflected by the at least one reflective surface into the light guide plate body.