Backlight Source Rigid Elastic Mounting for Thermal Expansion
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Solution Overview
Problem
The design of edge-type backlight sources for LCDs faces a conflict between maintaining high light efficiency and allowing for thermal expansion of the light guide plate, as increased distance for expansion lowers light efficiency, while insufficient distance leads to deformation and quality issues.
Innovation Solution
A backlight source design featuring a rigid element fixed between the light strip and the light guide plate to maintain constant distance, combined with an elastic element between the light strip and the back plate to accommodate thermal expansion, ensuring both high light efficiency and sufficient room for expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the light strip and the light guide plate is increased to provide room for thermal expansion, then the light guide plate can expand freely without deformation, but the light efficiency of the light beam entering the light guide plate decreases
Solution Approach 1:
The patent applies the dynamics principle by introducing an elastic element that enables dynamic adjustment of the distance between the light strip and light guide plate. The elastic element allows the light guide plate to expand during thermal deformation while maintaining contact with the light strip, thus accommodating thermal expansion without permanently increasing the distance and preserving light efficiency.
Solution Approach 2:
The patent applies parameter changes by modifying the physical state of the connection between the light strip and light guide plate through the elastic element. The elastic element changes from a rigid fixed connection to a flexible connection that can deform elastically, allowing the distance parameter to vary dynamically in response to thermal expansion while maintaining optimal light coupling.
2Illumination intensity
If the distance between the light strip and the light guide plate is decreased to improve light efficiency, then more light enters the light guide plate, but the light guide plate cannot expand freely and may be pressed and deformed
Solution Approach 1:
The elastic element transforms the static rigid connection into a dynamic system where the distance can adjust automatically. When the light guide plate expands due to heat, the elastic element deforms to accommodate the expansion, preventing deformation of the light guide plate while maintaining the small distance needed for high light efficiency.
Solution Approach 2:
The elastic element acts as a cushioning mechanism that anticipates and absorbs the thermal expansion forces before they can cause deformation. By placing the elastic element in advance between the light strip and light guide plate, it provides a compliant connection that absorbs expansion stresses, preventing damage to the light guide plate structure.
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 resolves the conflict between light efficiency and thermal expansion, improving the quality of the backlight source and display device by maintaining constant distance and allowing for elastic deformation to accommodate thermal changes.
Implementation Method 1
An elastic element is arranged between the light strip and the back plate and at a side of the light strip opposite to the light-entering surface of the light guide plate. When the light guide plate is thermally deformed, a deformation force generated by the light guide plate is applied to the rigid element so as to push the light strip to press against the elastic element.
Data Source
AI summary
The present disclosure provides a backlight source and a display device. A rigid element is arranged between a light strip of the backlight source and a light-entering surface of a light guide plate. One end of the rigid element is fixed onto the light strip, and the other end of the right element is fixed onto the light guide plate, so as to maintain a constant distance between the light strip and the light-entering surface of the light guide plate. An elastic element is arranged between the light strip and a back plate and at a side of the light strip opposite to the light-entering surface of the light guide plate. When the light guide plate is thermally deformed, a deformation force generated by the light guide plate is applied to the rigid element, so push the light strip to press against the elastic element.