Light Guide Plate Thermal Insulation for LCD Backlight
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Solution Overview
Problem
Conventional side type light source modules for LCDs face reliability issues due to heat generated by LEDs, which causes deformation of the light guide plate, affecting the uniformity and quality of the surface light source.
Innovation Solution
Incorporation of a thermal insulating element between the baseboard and the light guide plate, adjacent to the light incident surface, to isolate heat from the light emitting device, preventing direct transmission to the light guide plate and reducing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat is transmitted to the back frame from the light emitting device, then the heat can be dissipated through the back frame, but the light guide plate may be deformed due to the heat
Solution Approach 1:
A thermal insulating element is introduced as an intermediary between the light guide plate and the back frame. This insulating element blocks the heat transmission path from the light emitting device through the back frame to the light guide plate, while still allowing the back frame to serve as a heat dissipation structure for the light emitting device. The insulating element thus mediates between heat dissipation requirements and light guide plate stability requirements.
2Device complexity
If the light guide plate is disposed directly on the back frame, then the structure is simple, but the heat causes deformation of the light guide plate affecting optical quality
Solution Approach 1:
The thermal insulating element serves as a mediator layer between the back frame and the light guide plate. This addition prevents direct thermal contact that would cause deformation, while maintaining a relatively simple overall structure. The insulating element can be a thin layer or sheet that does not significantly complicate the assembly process or structural design.
3Reliability
If the thermal insulating element is disposed between the baseboard and the light guide plate, then the heat transmission to the light guide plate is blocked, but the device structure becomes more complex
Solution Approach 1:
The thermal insulating element is disposed specifically at the location where heat transmission would most affect the light guide plate - between the baseboard and the light guide plate adjacent to the light incident surface. This localized placement provides targeted thermal insulation exactly where needed, rather than requiring insulation throughout the entire structure, thus minimizing the increase in device complexity.
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 insulating element enhances the reliability and optical quality of the light source module by preventing heat-induced deformation of the light guide plate, maintaining uniformity and stability of the surface light source over time.
Implementation Method 1
a thermal insulating element... to isolate heat from the light emitting device, preventing direct transmission to the light guide plate
Data Source
AI summary
A light source module including a back frame, a light guide plate (LGP), and at least one light emitting device is provided. The back frame has a baseboard. The LGP is disposed on the back frame, and has a first surface, a second surface opposite to the first surface, and a light incident surface, wherein the second surface faces toward the baseboard. The light emitting device is disposed beside the light incident surface. The light source module further includes a thermal insulating element, which is disposed between the baseboard and the second surface, and is located adjacent to the light incident surface.