LCD Light Guide Plate Reflection Tape Blocks Leakage
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Solution Overview
Problem
Liquid crystal display (LCD) devices with LED light sources suffer from light leakage due to gaps between the light guide plate and the cover bottom, leading to reduced brightness and image quality.
Innovation Solution
The use of a reflection tape covering the LED assembly and the side surface of the light guide plate, along with a support main having a side wall, effectively blocks light leakage by ensuring that all emitted light is directed towards the liquid crystal panel, enhancing brightness and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the LED assembly is mounted on a bending portion of the cover bottom, then the device structure is simplified and easier to manufacture, but light leakage occurs through the gap between the light guide plate and the bending portion
Solution Approach 1:
A reflection tape is introduced as an intermediary component between the light guide plate and the cover bottom. This reflection tape fills the gap and redirects leaked light back toward the liquid crystal panel, thereby eliminating the harmful light leakage effect while maintaining the simplified bending portion structure
Solution Approach 2:
The reflection tape converts the harmful leaked light into beneficial light by reflecting it back toward the display area. The light that would otherwise be lost through the gap is now redirected to improve display brightness and uniformity, turning a structural deficiency into a functional advantage
2Object-generated harmful factors
If a reflection tape is added to cover the LED assembly and light guide plate side surface, then light leakage is prevented, but the device complexity increases
Solution Approach 1:
The reflection tape is implemented as a thin, flexible reflective film that can be easily applied to the side surfaces of the light guide plate and LED assembly. This thin-film approach provides effective light reflection without adding significant structural complexity, volume, or weight to the device
3Object-generated harmful factors
If the support main has a side wall structure, then light leakage is blocked, but the device volume and weight increase
Solution Approach 1:
The reflection tape provides an alternative to bulky side wall structures by using a thin, flexible reflective barrier that blocks light leakage without significantly increasing device volume or weight
Solution Approach 2:
Instead of using additional structural material to block light, the reflection tape converts potentially leaked light into useful light that contributes to display brightness, thereby addressing the light leakage problem without adding volume
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 implementation of the reflection tape and modified support structure significantly reduces light leakage, resulting in improved brightness and image quality while also allowing for a lighter and more compact LCD device design.
Implementation Method 1
The use of a reflection tape covering the LED assembly and the side surface of the light guide plate, along with a support main having a side wall, effectively blocks light leakage by ensuring that all emitted light is directed towards the liquid crystal panel
Data Source
AI summary
A liquid crystal display device includes a support main having a rectangular frame shape, a reflection sheet in the support main, a light guide plate over the reflection sheet, a light-emitting diode (LED) assembly including a plurality of LEDs arranged along a side surface of the light guide plate, a reflection tape covering the LED assembly and the side surface of the light guide plate, a plurality of optical sheets over the light guide plate, a liquid crystal panel over the plurality of optical sheets, a cover bottom at a rear surface of the reflection sheet and having at least one side wall, and a top cover covering edges of a front surface of the liquid crystal and combined with the support main and the cover bottom, wherein the reflection tape contacts the at least one side wall.