Liquid Crystal Display Light Guide Plate Groove Segmentation
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in reducing thickness and improving image quality, particularly in adjusting brightness and contrast, due to limitations in backlight technology, which can result in striped images and inadequate contrast when displaying white or black colors.
Innovation Solution
A liquid crystal display device design featuring a single light guide plate with vertically arranged regions and concave grooves on its rear surface, allowing for independent management of light sources and brightness control across each region to enhance contrast and motion picture quality without generating striped images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light guide plate is used, then device complexity is reduced and productivity is improved, but the ability to adjust brightness of particular regions is lost and image quality cannot be improved
Solution Approach 1:
The light guide plate is divided into multiple regions (first region, second region, third region, fourth region) with different groove patterns. Each region has grooves oriented in different directions (first direction, second direction perpendicular to first direction) to independently control light extraction and brightness, enabling regional brightness adjustment while using a single integrated plate
Solution Approach 2:
Different regions of the light guide plate are given different local structures - specific groove patterns and orientations tailored to each region's brightness requirements. The first and second regions have grooves in the first direction, while the third and fourth regions have grooves in the second direction, creating local optical properties optimized for each area
2Adaptability or versatility
If multiple light guide plates are combined to adjust regional brightness, then image quality can be improved, but striped images are generated and device complexity increases
Solution Approach 1:
The single light guide plate is segmented into multiple functional regions with different groove orientations, achieving the effect of multiple separate light guide plates without actually using multiple plates. This segmentation allows independent brightness control of each region while maintaining a unified structure that prevents striped artifacts
Solution Approach 2:
Multiple regional control functions are merged into a single light guide plate structure. The plate integrates the functionality of what would otherwise require multiple separate light guide plates, combining regional brightness control with a unified optical path to eliminate striped image artifacts
3Length of stationary object
If the liquid crystal display device thickness is reduced, then it becomes thinner than CRT, but further thickness reduction is difficult without compromising backlight performance
Solution Approach 1:
Grooves with curved cross-sections are formed in the light guide plate to enhance light extraction efficiency. The curved groove profiles increase the interaction between light and the groove surfaces, improving backlight efficiency without requiring increased plate thickness
Solution Approach 2:
The groove depth, width, and spacing parameters are optimized to maximize light extraction efficiency in a thin plate configuration. By carefully controlling these geometric parameters, the light guide plate achieves high backlight efficiency while maintaining reduced overall device thickness
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 improves contrast and motion picture quality by enabling precise control of light distribution and brightness across the liquid crystal panel, reducing material costs and environmental impact while maintaining high productivity and image quality.
Implementation Method 1
a light guide plate (121) so as to irradiate the liquid crystal panel (120) with a light ray (L) emitted from a light source (124)
Implementation Method 2
a plurality of concave grooves (121c) which extend from one incidence plane (121a) to the other incidence plane (121a) on a rear surface (121r) of the light guide plate (121)
Data Source
AI summary
An object of the present invention is to provide a liquid crystal display device having a light guide plate that is capable of providing improved liquid crystal display performance without generating a striped image. The liquid crystal display device includes a light guide plate, which illuminates a liquid crystal panel from its rear surface, and light sources, which shed a light ray on the light guide plate. The rear surface of the light guide plate is separated into a plurality of rear surface divisions by concave grooves. The light sources can adjust the brightness of each rear surface division. The display performance of the liquid crystal panel is improved by individually managing a plurality of regions of the liquid crystal panel, which correspond to the rear surface divisions, and darkening a rear surface division that corresponds to a region where the black color is predominant.