Light Guide Plate Positioning in Backlight Modules
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Solution Overview
Problem
Conventional edge-lighting backlight modules face issues with the positioning of light guide plates, which can lead to cracks and breakage during environmental tests due to collisions with positioning pillars, and increasing the number of pillars complicates assembly and affects positioning accuracy.
Innovation Solution
A backlight module design featuring a base with a sidewall and a light guide plate, where the light guide plate is positioned by a first elastic member on the sidewall and a second positioning unit on the base, with the elastic member providing greater resistance in one direction and the positioning pillar providing less resistance in another, allowing for controlled displacement and assembly flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of positioning pillars is increased to improve positioning ability and reduce impact damage, then the positioning function is improved, but the assembly complexity and difficulty of production control increase
Solution Approach 1:
The positioning function is divided into two independent units: the first positioning unit on the sidewall and the second positioning unit on the base. Each unit handles positioning in different directions, avoiding the need for multiple pillars while maintaining positioning ability. This segmentation reduces assembly complexity while preserving the positioning function.
2Manufacturing precision
If the number of positioning pillars is increased to reduce tolerance extent, then the positioning precision is improved, but the degree of freedom restriction becomes excessive and affects production control
Solution Approach 1:
Different positioning units are designed with different displacement resistance characteristics tailored to specific directional needs. The first positioning unit provides stronger resistance in the first direction, while the second positioning unit provides weaker resistance in the second direction. This localized differentiation achieves precise positioning control without excessive restriction of degrees of freedom, facilitating production control.
3Stability of the object's composition
If positioning pillars are made stronger to prevent slanting during environmental test, then the positioning stability is improved, but the collision impact on the light guide plate increases causing cracks and breakage
Solution Approach 1:
The first positioning unit incorporates an elastic member that can deform elastically during impact events. This elastic deformation absorbs collision energy before it reaches the light guide plate, preventing cracks and breakage. The elastic member maintains positioning stability while cushioning the impact, resolving the contradiction between stability and harmful collision effects.
4Object-affected harmful factors
If positioning pillars are made weaker to reduce collision impact, then the light guide plate damage is reduced, but the positioning pillar slants during environmental test losing positioning function
Solution Approach 1:
The positioning function is segmented into two independent units with different structural characteristics. The first positioning unit uses an elastic member to handle impact forces while maintaining positioning, and the second positioning unit provides additional support. This segmentation allows each unit to be optimized for its specific function, preventing slanting while reducing collision impact.
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 enhances the positioning of the light guide plate while reducing the risk of damage during environmental tests, maintaining assembly flexibility and improving production control by distributing displacement resistance effectively.
Implementation Method 1
The first positioning unit disposed on the sidewall is an elastic member. The elastic member has multiple connecting parts and at least one curved portion
Data Source
AI summary
A light guide plate positioning design in backlight module includes a base, a light guide plate, a first positioning unit, and a second positioning unit. The base has a sidewall extending along a second direction. The first positioning unit is disposed on the sidewall for contacting the light guide plate to resist a displacement of the light guide plate in a first direction, and further to position the light guide plate relatively to the sidewall in the first direction. The second positioning unit is disposed on the base for contacting the light guide plate to resist a displacement of the light guide plate in the second direction, and further to position the light guide plate in the second direction in a position along the side wall. The resistance of the first positioning unit to the displacement of the light guide plate is greater than that of the second positioning unit.