Backlight Module Heat Dissipation Element for LCD Thermal Management
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Solution Overview
Problem
Existing backlight modules suffer from light guide plate deformation due to thermal expansion, causing the light source to be compressed and potentially damaged, as the light guide plate's glass transition temperature is exceeded, leading to loss of total reflection angle and potential damage.
Innovation Solution
A backlight module design featuring a heat dissipation element with a horizontal and vertical part interconnected, allowing relative movement between the light guide plate and the light source, and a connector system that enables the heat dissipation element to contact outside air for enhanced cooling, preventing deformation and maintaining the light source's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the light guide plate is fixed rigidly to the backplane, then the structural stability is improved, but the light guide plate thermal expansion will compress and damage the light source
Solution Approach 1:
The connector is designed with a movable second connecting portion that can slide within the through hole along the gap direction. This dynamic structure allows the heat dissipation element to move relative to the backplane when the light guide plate expands thermally, preventing compression of the light source while maintaining structural stability during normal operation.
2Stability of the object's composition
If the light guide plate is constrained firmly, then the position stability is improved, but the heat dissipation efficiency deteriorates due to insufficient air contact
Solution Approach 1:
The movable second connecting portion enables the heat dissipation element to adjust its position dynamically. When thermal expansion occurs, the element can move to maintain optimal contact with the light source for heat dissipation while still providing positional stability through the connector's constrained motion path within the through hole.
3Manufacturing precision
If the connector is rigid and fixed, then the manufacturing precision is improved, but the adaptability to thermal expansion deteriorates
Solution Approach 1:
The connector combines precise manufacturing features (threaded first connecting portion, fitted third connecting portion) with a dynamic middle section (second connecting portion sliding in through hole). This hybrid design maintains high assembly precision while accommodating thermal expansion through controlled movement of the second connecting portion.
Solution Approach 2:
The connector is divided into three distinct functional segments: a fixed first connecting portion for precise attachment to the backplane, a movable second connecting portion for accommodating thermal expansion, and a supported third connecting portion for stabilizing the heat dissipation element. This segmentation allows each part to perform its specific function optimally.
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
This design prevents light guide plate deformation, reduces light source temperature, and enhances heat dissipation, ensuring stable operation and maintaining the light guide plate's reflection angle.
Implementation Method 1
a heat dissipation element, and the heat dissipation element includes a horizontal part and a vertical part interconnected to each other, and the horizontal part is disposed on the other side of the backplane away from the light guide plate, and the vertical part is disposed next to light incident surface of the light guide plate
Implementation Method 2
the backlight module further comprises the reflective film between the light guide plate and the backplane
Implementation Method 3
the glass transition temperature of the light guide plate is generally less than 90 degrees. When the display module is placed in an ambient temperature of 40 degrees, the light guide plate may bear the light source surface temperature over 90 degrees. It will exceed the glass transition temperature of the light guide plate. At this time the light guide plate will soften and destroy the total reflection angle of the light guide plate.
Data Source
AI summary
The present invention discloses a backlight module and a liquid crystal display (LCD). The backlight module includes a backplane, a light guide plate, a heat dissipation element and a connector. The light guide plate is disposed on the side of the backplane. The heat dissipation element includes a horizontal part and a vertical part interconnected to each other. The horizontal part is disposed on the other side of the backplane away from the light guide plate, and the vertical part is disposed next to light incident surface of the light guide plate. The light source is disposed on the side of the vertical part close to light incident surface. The connector connects the heat dissipation element to the backplane and allows the heat dissipation element to move relatively to the backplane in the gap direction between the light guide plate and the light source. Through this way, the backlight module and LCD according to the present invention can effectively prevent the light guide plate to squeeze the light source and reduce the temperature of the light source.