Light Guide Plate Protrusions for Backlight Alignment
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Solution Overview
Problem
Conventional light guide plates in backlight modules often have size mismatches with their frames, leading to gaps between light emitting diodes and the light incident surface, resulting in reduced light utilization efficiency due to leaked light.
Innovation Solution
A light guide plate design featuring protrusions on its side surfaces, where the thickness of each protrusion decreases with increasing distance from the light incident surface, allowing the protrusions to fit snugly into notches in the frame, ensuring proper alignment and minimizing gaps between light emitting diodes and the light incident surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light guide plate size is made slightly smaller than the frame inner dimensions, then assembly is easier and alignment is simpler, but gaps form between light emitting diodes and the light incident surface causing light leakage
Solution Approach 1:
The invention transitions from a planar alignment problem to a three-dimensional solution by adding protrusions on the side surfaces of the light guide plate. These protrusions extend in the lateral dimension to engage with corresponding grooves in the frame, providing mechanical coupling that eliminates gaps without complicating the top-down assembly process.
Solution Approach 2:
The protrusions on the light guide plate are nested within the grooves of the frame structure. This nesting arrangement allows the light guide plate to be securely positioned within the frame while maintaining ease of assembly, as the protrusions fit smoothly into the grooves without requiring complex alignment procedures.
2Manufacturing precision
If protrusions are added to the side surfaces of the light guide plate, then alignment precision is improved and gaps are eliminated, but the device complexity increases
Solution Approach 1:
Instead of making the entire light guide plate complex, the invention applies local quality by adding protrusions only to specific locations on the side surfaces where alignment is needed. The bulk of the light guide plate remains simple and easy to manufacture, while only the critical alignment portions are enhanced.
Solution Approach 2:
The protrusions are positioned asymmetrically on the side surfaces of the light guide plate, corresponding to the asymmetric placement of light emitting diodes in the backlight module. This asymmetric design provides precise alignment for the specific application while avoiding unnecessary symmetry that would complicate the structure.
Data Source
AI summary
A light guide plate includes: a light emitting surface; a bottom surface opposite to the light emitting surface; a light incident surface perpendicularly connected with the light emitting surface; a first side surface perpendicularly connected with both the light incident surface and the light emitting surface; a second side surface opposite to the first side surface; two protrusions outwardly extending from the first side surface; and two protrusions outwardly extending from the second side surface. A thickness of each protrusion of the first side surface decreases with increasing distance away from the light incident surface, and a thickness of each protrusion of the second side surface also decreases with increasing distance away from the light incident surface.