Backlight Unit Protrusion-Groove Mechanical Coupling
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices experience luminance deviation due to adhesive weakening and assembly deviations between the light guide plate and light source substrate, leading to non-uniform light distribution caused by heat generation and external vibrations.
Innovation Solution
A backlight unit design featuring a light source substrate with protrusions and a light guide plate with corresponding grooves, which securely couple to prevent separation and ensure uniform light distribution, eliminating the need for adhesives and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive is used to bond the light source substrate to the light guide plate, then initial assembly is simplified, but adhesion weakens due to heat and vibrations causing separation and luminance deviation
Solution Approach 1:
The patent replaces the chemical bonding system (adhesive) with a mechanical interlocking system. The light source substrate includes protrusions that fit into grooves formed on the light guide plate, creating a mechanical connection that resists separation forces from heat expansion and vibrations without relying on adhesive bonds.
Solution Approach 2:
The bonding interface is segmented into multiple discrete engagement points through the protrusion-groove structure. Instead of relying on a continuous adhesive layer that can uniformly degrade, the mechanical interlocking is distributed across multiple localized contact points, providing redundant bonding paths that maintain integrity even if individual engagement points fail.
2Adaptability or versatility
If assembly deviations occur during attachment, then manufacturing flexibility is maintained, but separation distance varies causing non-uniform luminance characteristic
Solution Approach 1:
The patent changes the geometric parameters of the protrusions and grooves to create a self-aligning mechanism. The protrusions are positioned and dimensioned to naturally guide the light source substrate into correct alignment with the light guide plate during assembly, compensating for positional variations and ensuring consistent separation distance without requiring high-precision assembly equipment.
3Device complexity
If light source substrate is directly bonded to light guide plate, then structure is simplified, but heat causes adhesive deterioration and separation region formation
Solution Approach 1:
The patent replaces the heat-sensitive chemical bonding system (adhesive) with a heat-resistant mechanical interlocking system. The protrusion-groove mechanical connection remains stable under thermal conditions, preventing the adhesive deterioration and separation region formation that occurs with conventional bonding methods.
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 effectively reduces luminance deviation by ensuring consistent light distribution across the LCD panel, enhancing the backlight unit's stability and assembly efficiency while maintaining cost-effectiveness.
Implementation Method 1
a light guide plate contacting an emitting surface of each of the light emitting diodes and converting line-shaped light generated from the light emitting diodes into a surface-shaped light
Data Source
AI summary
A backlight unit capable of reducing or effectively preventing a luminance deviation includes a plurality of light emitting diodes, a light source substrate on which the plurality of light emitting diodes is mounted, a light guide plate converting line-shaped light generated from the light emitting diodes into a surface-shaped light, an incident surface of the light guide plate contacting an emitting surface of each of the light emitting diodes, a first fixing part formed on the light source substrate in a region overlapping the light guide plate and a second fixing part formed on the light guide plate and coupled to the first fixing part.