Backlight Module Recess Adhesive for Thin LCD
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Solution Overview
Problem
Conventional backlight modules for liquid crystal displays (LCDs) face challenges in reducing thickness due to the thickness of double-faced adhesive tapes used to secure light guide plates, which hinders the trend of making portable electronic products thinner and lighter.
Innovation Solution
A recess is disposed on the optical surface of the light guide plate to accommodate an adhesive member, allowing it to adhere simultaneously to the bottom surface and sidewall, enhancing adhesive strength and reducing module thickness without affecting light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a double faced adhesive tape is used to secure the light guide plate to the back plate, then the light guide plate can be firmly attached, but the thickness of the backlight module increases
Solution Approach 1:
The adhesive member is configured to extend along the thickness direction of the light guide plate, transitioning from a planar adhesive application to a three-dimensional structure. This vertical extension allows the adhesive to engage both the bottom surface and sidewall of the recess, providing multi-directional bonding that enhances strength while maintaining compact thickness
Solution Approach 2:
The adhesive member is disposed within a recess formed in the light guide plate, creating a nested structure where the adhesive is embedded into the light guide plate body. This nesting approach allows the adhesive to provide bonding strength without adding external thickness to the overall module assembly
2Length of stationary object
If the thickness of the backlight module is reduced, then portable electronic products can be made thinner, but the adhesive strength between the light guide plate and back plate may be compromised
Solution Approach 1:
By extending the adhesive member along the thickness direction and configuring it to bond with both the bottom surface and sidewall of the recess, the adhesive gains additional bonding surfaces in the vertical dimension. This multi-directional bonding compensates for the reduced overall module thickness while maintaining or even enhancing adhesive strength
Solution Approach 2:
The adhesive member is designed as a composite structure that can simultaneously adhere to different surfaces (bottom surface and sidewall), creating a multi-faceted bonding system that provides enhanced mechanical interlocking and bonding strength within a compact thickness profile
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 effectively reduces the overall thickness of the backlight module and LCD while maintaining functionality, and can be further optimized by using white coverlays to replace traditional reflectors, achieving a 10% reduction in module thickness without compromising light reflection rates.
Implementation Method 1
The adhesive member is disposed in the recess to adhere the light guide plate to the back plate
Data Source
AI summary
A light guide assembly, a backlight module and a liquid crystal display (LCD) are provided. The backlight module includes a back plate, light guide plate, an adhesive member and a light source. The light guide plate is disposed on the back plate and includes a first optical surface, a second optical surface and a light-incident surface. The first optical surface is opposite to the second optical surface. The light-incident surface connects the first optical surface and the second optical surface. The first optical surface or the second optical surface of the light guide plate is set with a recess. The adhesive member is disposed in the recess to adhere the light guide plate to the back plate. The light source is disposed on the back plate and emits light toward the light guide plate.