Light Guide Plate Positioning with Mold Frame Support
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Solution Overview
Problem
Existing planar light source devices face issues with structural strength, leading to potential damage from impact and luminance unevenness, and are prone to foreign matter ingress due to wide frames and inadequate support mechanisms, particularly in large-sized displays with thick light guide plates.
Innovation Solution
A planar light source device design featuring a light guide plate with positioning parts, a rear frame, and a mold frame that interposes between the light guide plate and the rear frame, providing enhanced structural support and a narrower frame configuration to prevent damage and foreign matter ingress, using a convex or concave positioning part and a frame shape that fits with the light guide plate, ensuring secure positioning and reduced frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the light guide plate thickness is increased to support larger screens with higher luminance, then the light guide plate can support more light sources, but the device becomes heavier and more prone to damage from impact
Solution Approach 1:
The support function is segmented between the light guide plate itself and the case structure with positioning parts. The case is divided into multiple positioning parts that distribute the support load, allowing the light guide plate to be thinner while maintaining overall structural strength.
Solution Approach 2:
Instead of increasing thickness in the vertical dimension, the solution moves support functionality to the lateral dimension by incorporating positioning parts into the case structure that engage with the light guide plate edges, providing support without increasing plate thickness or weight.
2Device complexity
If the light guide plate is supported and fixed only by a case, then the structure is simple, but the positioned part of the light guide plate may be damaged due to lack of strength
Solution Approach 1:
The case structure incorporates localized positioning parts at specific locations where the light guide plate requires support. These positioning parts concentrate support functionality at critical points rather than requiring a complex overall restructuring, maintaining simplicity while improving reliability at key positions.
3Manufacturing precision
If a wide frame is used with a groove in the center for positioning, then the light guide plate can be positioned, but the frame width becomes large and foreign matter can enter through gaps
Solution Approach 1:
The positioning function is extracted from the main frame body and implemented as separate positioning parts integrated into the case structure. This eliminates the need for a wide frame with central groove, allowing the frame to be narrower while maintaining positioning precision through the distributed positioning parts.
Solution Approach 2:
The positioning parts are merged with the case structure rather than being separate frame components. This integration eliminates gaps between the frame and positioning elements, preventing foreign matter ingress while maintaining positioning functionality.
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 solution enhances the structural integrity of the light guide plate, preventing damage from impacts and ensuring uniform light distribution, while minimizing the risk of foreign matter entry, thus maintaining high performance and luminance consistency in large-sized displays.
Implementation Method 1
light from a light source enters the side of a light guide plate. Then, the light guide plate emits the light from the light source to the front
Data Source
AI summary
A planar light source device includes a light guide plate, a lamp unit and emitting light to a side surface of the light guide plate, a rear frame for storing the light guide plate and the lamp unit and a mold frame in frame shape disposed between the light guide plate and the rear frame for fitting with the light guide plate provided with a positioning part. In the positioning part, the light guide plate has a surface almost parallel to a side surface provided with the positioning part and a connection surface for connecting the parallel surface with the side surface provided with the positioning part. The rear frame supports the light guide plate with the mold frame interposed therebetween, and includes a projecting part projected inside and formed of an end edge surface and a side edge surface, the end edge surface being disposed to oppose the side surface provided with the positioning part of the light guide plate and the side edge surface being disposed to oppose the connection surface.