Edge-Lit Backlight Light Guide Panel Positioning Structure
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Solution Overview
Problem
Conventional edge-lit backlight modules face issues with heat expansion and cold contraction of the light guide panel, leading to warpage, deformation, and potential fracture due to rigid positioning structures that do not absorb thermal changes effectively.
Innovation Solution
A positioning structure that rigidly positions the light guide panel in the direction facing the light source while using a buffer system in other directions, incorporating a positioning column and elastic rubber ring with a tooth-shaped surface to absorb thermal expansions and contractions, reducing the risk of deformation and fracture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid positioning columns or right-angle positioning rims are used to position the light guide panel, then the light coupling distance between the light source and the light guide panel can be accurately ensured, but the light guide panel cannot fully absorb heat expansion or cold contraction, easily causing warpage and deformation
Solution Approach 1:
The positioning structure is divided into multiple positioning points (at least three corners of the light guide panel), with each point providing independent positioning support. This segmentation allows the system to maintain overall positioning accuracy while distributing thermal stress across multiple locations, preventing concentrated stress that would cause warpage.
Solution Approach 2:
Different regions of the positioning structure have different properties: the positioning columns provide rigid support in the vertical direction to ensure light coupling distance, while the horizontal positioning allows thermal expansion. The positioning columns have circular cross-sections that provide radial flexibility while maintaining vertical rigidity, creating local quality differences that resolve the contradiction.
2Stability of the object's composition
If rigid positioning columns or right-angle positioning rims are used to position the light guide panel, then the positioning structure can maintain stable geometry, but the light guide panel is in rigid contact with the positioning structure, easily causing fracture when impacted
Solution Approach 1:
The positioning structure transitions from a completely rigid system to a semi-dynamic system where the light guide panel can move horizontally along the positioning columns during thermal expansion or impact events. The circular cross-section of the positioning columns allows rotational and lateral movement while maintaining vertical positioning, enabling the system to adapt dynamically to external forces.
Solution Approach 2:
The positioning structure is designed with inherent flexibility in the horizontal direction before any thermal expansion or impact occurs. The circular cross-section positioning columns provide a buffer zone that absorbs impact energy through controlled movement and deformation, preventing direct transmission of impact forces to the light guide panel corners.
3Manufacturing precision
If multiple positioning points are used to ensure light coupling distance, then positioning accuracy is improved, but the number of positioning components increases, increasing assembly complexity
Solution Approach 1:
The positioning columns serve multiple functions simultaneously: they provide vertical positioning to ensure light coupling distance, allow horizontal thermal expansion, and provide impact cushioning. This multi-functionality reduces the need for separate components for each function, simplifying the overall structure despite using multiple positioning points.
Solution Approach 2:
The positioning columns use specific geometric parameters (circular cross-section with specific diameter ratios between the column body and top portion) to achieve multiple functions. By optimizing these parameters, the same component structure can provide both rigid vertical support and flexible horizontal movement, reducing the need for additional components.
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 solution ensures accurate light coupling distance and maintains optical quality by absorbing heat expansion and cold contraction, preventing warpage and fracture of the light guide panel while minimizing module volume and assembly complexity.
Implementation Method 1
the positioning column for buffer positioning is sheathed with an elastic rubber ring. The elastic rubber ring can provide certain buffer space by self elasticity
Implementation Method 2
the light source of the backlight module radiates heat while in use, which heats and expands the light guide panel
Data Source
AI summary
The invention relates to the field of liquid crystal displays, and more particularly to an edge-lit backlight module and an LCD device. The edge-lit backlight module includes a light guide panel and a positioning part for positioning the light guide panel. The light guide panel is rigidly positioned in the direction facing a light source and buffer positioned in all the other directions. A new positioning structure for light guide panels is used by the edge-lit backlight module and the LCD device of the invention. The light coupling distance between the light guide panel and the light source of the edge-lit backlight module is controlled because the light guide panel is rigidly positioned in the direction facing the light source, so as to obtain preferable light guiding effect. The light guide panel is buffer positioned in other directions in order to absorb the heat expansion or cold contraction quantity of the light guide panel, and avoid the warpage and deformation of the light guide panel; and the fracture of the light guide panel caused by the rigid contact between the light guide panel and the positioning structure when the light guide panel is impacted is avoided.