Backlight Module Elastic Light Source Positioning
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Solution Overview
Problem
The edge-type backlight module experiences unstable optical performance due to changes in the volume of the light guide plate caused by temperature variations, affecting the consistent distance between the light source and the light guide plate.
Innovation Solution
Incorporating an elastic element connected to a fixing element that pushes the light source against the light guide plate, maintaining a fixed distance between the light source and the light incident surface, even when the light guide plate's volume changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light guide plate is used to transform light from the light source, then the backlight module achieves a compact structure and cost-effectiveness, but the distance between the light source and light guide plate becomes unstable due to thermal expansion and contraction
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism comprising an elastic element and a driving element that automatically adjusts the position of the light source based on the thermal expansion or contraction of the light guide plate. When the light guide plate expands due to heat, the driving element moves to increase the distance; when it contracts, the elastic element pushes the light source to maintain the optimal distance, thus maintaining stable optical performance despite temperature variations
Solution Approach 2:
The patent implements a feedback mechanism where the position of the light source is continuously adjusted in response to the dimensional changes of the light guide plate. The driving element detects the thermal expansion state and automatically adjusts the light source position accordingly, creating a closed-loop system that maintains stable optical performance through real-time position correction based on thermal conditions
2Temperature
If the light guide plate volume changes due to temperature variations, then thermal effects are naturally accommodated, but the distance between the light source and light guide plate varies causing unstable optical performance
Solution Approach 1:
The system transitions from a static light source position to a dynamic adjustment mechanism that actively compensates for thermal expansion and contraction. The elastic element and driving element work together to move the light source position in real-time, ensuring that the distance between the light source and light guide plate remains consistent despite temperature-induced volume changes in the light guide plate
Solution Approach 2:
The patent changes the position parameter of the light source dynamically in response to temperature variations. By adjusting the distance between the light source and light guide plate based on thermal conditions, the system maintains optimal optical performance across different temperature ranges, effectively decoupling the precision requirement from thermal effects
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 configuration ensures a stable optical grade by maintaining a consistent distance between the light source and the light guide plate, regardless of temperature-induced volume changes, thereby enhancing the backlight module's performance.
Implementation Method 1
The elastic element is connected to the fixing element, wherein the elastic element is adapted to push the light source to be against the light incident surface
Data Source
AI summary
A backlight module includes a light guide plate, a light source, a fixing element and an elastic element. The light guide plate has a light incident surface. The light source has a light-emitting side and a back side opposite to the light-emitting side, and the light-emitting side faces the light incident surface. The fixing element is disposed to be opposite to the back side. The elastic element is connected to the fixing element, wherein the elastic element is adapted to push the light source to be against the light incident surface.