Backlight Module Troughs for Adhesive Alignment
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Solution Overview
Problem
Conventional backlight modules with thinner adhesives suffer from poor alignment and security of light sources and light guide plates, leading to suboptimal optical performance due to reduced adhesive strength and increased hot spots.
Innovation Solution
A backlight module design featuring a light guide plate with troughs on its bottom for the adhesive layer, which connects the light guide plate to the light source module, ensuring better alignment and security, with an adhesive layer thickness of 0.06-0.085 mm and trough depth of 0.5-2 mm, allowing finger portions to protrude and secure the components without interfering with light paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a thinner tape is used to replace the conventional tape, then the thickness of the backlight module is reduced, but the attaching ability between the light guide plate and the light source module deteriorates
Solution Approach 1:
The adhesive layer is segmented into multiple finger portions that protrude into the troughs, creating multiple attachment points along the light guide plate. This segmentation increases the effective bonding area and mechanical interlocking without requiring a thicker adhesive layer, thus maintaining strong attachment while preserving module thinness.
Solution Approach 2:
The adhesive layer is nested within the troughs formed on the light guide plate. The finger portions of the adhesive layer are inserted into and protrude from the troughs, creating a nested structure that maximizes bonding surface area and mechanical interlocking within the available thickness space.
2Length of stationary object
If a thinner tape is used to reduce module thickness, then the space occupied by the adhesive layer is reduced, but the alignment precision between light sources and light guide plate deteriorates
Solution Approach 1:
The adhesive layer is divided into multiple finger portions positioned at specific intervals corresponding to the light source locations. This segmentation allows precise positioning and alignment of each light source with the light guide plate, as each finger portion can be independently positioned to ensure optimal alignment.
Solution Approach 2:
The troughs are pre-formed on the light guide plate at predetermined positions before assembly. This preliminary structuring guides the adhesive layer and light source module into precise alignment during assembly, ensuring that the light sources are correctly positioned relative to the light guide plate without requiring post-assembly adjustment.
3Length of stationary object
If the adhesive layer thickness is reduced to thin the module, then the space occupied is reduced, but the security of the light guide plate relative to the light source module deteriorates
Solution Approach 1:
The adhesive layer is nested within the troughs, with finger portions protruding into the troughs to create mechanical interlocking. This nesting arrangement maximizes the bonding surface area and mechanical security within the limited thickness space, ensuring reliable attachment without requiring a thicker adhesive layer.
Solution Approach 2:
The attachment mechanism transitions from a planar adhesive layer to a three-dimensional structure with finger portions protruding into the troughs. This dimensional change creates mechanical interlocking and increases bonding surface area in the vertical dimension, thereby enhancing attachment security without increasing the overall module thickness.
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 design enhances the alignment and security of light sources and light guide plates, reducing space usage and maintaining optical performance by ensuring proper adhesion and tensile strength, preventing peeling and minimizing hot spots.
Implementation Method 1
an adhesive layer (300) attached onto a face of the substrate (210) facing the bottom (120) and extends into the troughs (125) to be attached to the light guide plate (100)
Data Source
AI summary
A thin backlight module includes a light guide plate, a light source module, and an adhesive layer. The light guide plate has a light-entering end and a bottom, wherein a plurality of troughs spaced at intervals are formed on a portion of the bottom connected to the light-entering end. The light source module is disposed corresponding to the light-entering end and includes a substrate and a plurality of light sources. The light sources are disposed on the substrate and distributed along the light-entering end, wherein each of the light sources corresponds to an interval between the adjacent troughs. The adhesive layer is attached to the substrate, faces the bottom of the light guide plate, and extends into the troughs to be attached to the light guide plate.