Light Guide Plate with Dimming Pits for Uniform Backlight Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Direct-lit backlight modules face challenges in achieving uniform light distribution and reducing energy consumption, particularly in large-size liquid crystal displays, due to limitations in light mixing distance and bezel width, leading to inefficiencies and unsatisfactory screen performance.
Innovation Solution
A light guide plate with a light-transmitting plate body featuring light guide dots and dimming pits with multiple levels of dimming surfaces, designed to reflect and scatter light uniformly, coupled with a fabrication method using injection molding or curing, which reduces light mixing distance and thickness, enabling efficient light distribution and compact module design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If direct-lit backlight module is used for large-size liquid crystal displays, then locally controllable light and high backlight efficiency are achieved, but uniform light distribution is difficult to achieve due to limitations in light mixing distance
Solution Approach 1:
The light guide plate is segmented with multiple light guide dots and dimming pits distributed across its surface. These segmented structures divide and redirect light paths, enabling uniform light distribution across large display areas while maintaining high backlight efficiency through localized light control.
Solution Approach 2:
Different regions of the light guide plate have different structures - light guide dots in certain areas and dimming pits in others. This local quality variation allows specific areas to perform specific functions (light guiding vs. dimming), achieving both uniform distribution and high efficiency in different zones of the backlight module.
2Illumination intensity
If light guide plate with multiple levels of dimming surfaces is used, then uniform light exit is achieved, but device complexity increases
Solution Approach 1:
Multiple functional elements (light guide dots, dimming pits with multiple levels) are merged into a single integrated light guide plate structure. This combining of functions into one component achieves uniform light exit while avoiding the complexity of multiple separate optical elements.
Solution Approach 2:
The dimming pits incorporate multiple levels or tiers of dimming surfaces, transitioning from a two-dimensional surface structure to a three-dimensional multi-level structure. This dimensional change enables complex light redistribution patterns while maintaining a relatively simple overall geometry that can be manufactured using standard molding techniques.
3Length of stationary object
If light mixing distance is reduced to achieve thinner backlight modules, then compact design is achieved, but light distribution uniformity deteriorates
Solution Approach 1:
By segmenting the light guide plate into multiple functional zones with light guide dots and dimming pits, the system achieves effective light redistribution over shorter distances. This segmentation allows compact thickness while maintaining uniformity through localized light management rather than relying on long-distance mixing.
Solution Approach 2:
The invention changes the optical parameters within the light guide plate by introducing structures with specific geometries (dot sizes, pit depths, surface angles) that optimize light redistribution efficiency. These parameter changes enable uniform light distribution in a compact thickness by enhancing light interaction per unit distance rather than increasing overall distance.
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 uniform light exit from the light guide plate, reducing energy consumption and allowing for thinner, more compact direct-lit backlight modules suitable for small-size liquid crystal displays with improved screen uniformity and reduced bezel width.
Implementation Method 1
an inner wall of each of the dimming pits sequentially includes multiple levels of dimming surfaces along a depth direction of the dimming pits, for reflecting light incident thereon to the light guide dots
Implementation Method 2
a plurality of light guide dots are provided around each of the dimming pits... achieves uniform light exit from the light guide plate
Data Source
AI summary
The present disclosure relates to a light guide plate and its fabricating method, as well as a backlight module. The light guide plate comprises a light-transmitting plate body provided with a plurality of light guide dots on a light-exiting surface thereof, and further provided with a plurality of dimming pits, wherein a plurality of light guide dots are provided around each of the dimming pits; an inner wall of each of the dimming pits sequentially includes multiple levels of dimming surfaces along a depth direction of the dimming pits, for reflecting light incident thereon to the light guide dots. The backlight module comprises the light guide plate provided in the above-described technical solution.