Backlight Module Thermal Isolating Layer for LCD Light Leakage
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Solution Overview
Problem
Conventional backlight modules for LCDs suffer from heat dissipation issues that lead to incomplete twist of liquid crystal molecules, causing light leakage and affecting the overall performance and longevity of the display device.
Innovation Solution
A backlight module design incorporating a thermal isolating layer between the light guide plate and the bottom plate that overlaps the display area, which enhances thermal isolation and reduces heat conduction to the liquid crystal molecules, thereby preventing incomplete twist and prolonging the light source's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the bottom plate is extended to improve heat dissipation, then the heat dissipation effect is enhanced, but heat is conducted to the display area causing incomplete twist of liquid crystal molecules and light leakage
Solution Approach 1:
A thermal isolating layer is introduced as an intermediary between the bottom plate and the light guide plate. This layer has low thermal conductivity, which blocks the heat conduction path from the bottom plate to the display area while allowing the bottom plate to continue dissipating heat effectively. The thermal isolating layer thus resolves the contradiction by enabling heat dissipation without transferring harmful heat to the display area.
Solution Approach 2:
The bottom plate is segmented into two functional zones: a heat dissipation zone that extends to improve thermal performance, and a protected zone where the thermal isolating layer prevents heat from reaching the display area. This segmentation allows the bottom plate to fulfill both heat dissipation and heat protection functions simultaneously.
2Duration of action of stationary object
If the bottom plate is extended to enhance heat dissipation, then the lifetime of the light source is prolonged, but the display area performance is degraded due to thermal influence on liquid crystal molecules
Solution Approach 1:
The thermal isolating layer serves as a mediator that protects the display area from thermal influence while allowing the bottom plate to maintain its heat dissipation function for extending light source lifetime. The isolating layer ensures that the display area remains at safe temperatures for liquid crystal molecule operation.
3Object-affected harmful factors
If a thermal isolating layer is added to prevent heat conduction, then light leakage is reduced, but the device complexity increases
Solution Approach 1:
The thermal isolating layer is designed as a thin film or shell structure with low thermal conductivity. This thin-film approach provides effective thermal isolation to prevent light leakage while adding minimal structural complexity and volume to the device.
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 thermal isolating layer effectively mitigates the thermal effect on liquid crystal molecules, reducing light leakage and extending the lifespan of the light source while maintaining high brightness and performance.
Implementation Method 1
a thermal isolating layer is interposed between the light guide plate and a portion of the bottom plate that overlaps the display area
Data Source
AI summary
A display device and a backlight module thereof are provided. The display device further includes a display panel having a display area. The backlight module is disposed under the display panel and includes a light source holder, a light source, and a light guide plate. The light source holder has a sidewall, a top plate, and a bottom plate, wherein the bottom plate partially overlaps the display area of the display device. The light guide plate is disposed corresponding to the display area of the display device and has one end located in an opening between the top plate and the bottom plate. A thermal isolating layer is interposed between the light guide plate and a portion of the bottom plate which corresponds to the display area. The perpendicular distance between the light guide plate and the portion of the bottom plate overlapping the thermal isolating layer is greater than a perpendicular distance between the light guide plate and the other portion of the bottom plate.