Backlight Cushion Structure for Light Guide Plate Thermal Expansion
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Solution Overview
Problem
Edge-lit backlight modules experience optical component displacement and friction due to rubber components compressing the light guide plate in high-temperature environments, leading to debris generation and optical interference.
Innovation Solution
A backlight module design incorporating a cushion member with a lower and side portion that abuts against the back cover's side wall, forming a gap to accommodate deformation, preventing upward displacement of the light guide plate and optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rubber components are used to secure the light guide plate to the back cover, then the light guide plate is fixed in place, but in high-temperature environments the rubber component compresses the light guide plate and drives optical components to be displaced upward, causing friction and debris generation
Solution Approach 1:
A cushion member is introduced as an intermediary component between the light guide plate and the back cover. This cushion member absorbs the thermal expansion forces and prevents direct contact between the light guide plate and the back cover, thereby eliminating the harmful friction and displacement of optical components while maintaining secure fixation.
Solution Approach 2:
The cushion member is designed with specific material properties and geometric parameters (thickness, elasticity modulus) that allow it to deform under thermal expansion forces. By changing the physical state and dimensions of the cushion member in response to temperature changes, the system accommodates thermal expansion without causing damage to optical components.
2Reliability
If the rubber component is compressed by the light guide plate in high-temperature environments, then the light guide plate is secured, but the rubber component drives the light guide plate and optical films to be displaced upward, causing interference and friction
Solution Approach 1:
The cushion member serves as a mediator that decouples the securing function from the positional constraint. It allows the light guide plate to be securely held while preventing the transmission of compressive forces that would otherwise displace optical components, thus maintaining both reliability and manufacturing precision.
Solution Approach 2:
The cushion member is pre-installed between the light guide plate and the back cover to provide beforehand cushioning against thermal expansion forces. This preventive measure ensures that when temperature increases occur, the cushion member is already in place to absorb the expansion forces, preventing upward displacement of optical components.
3Stability of the object's composition
If optical components are displaced upward due to rubber component compression, then the light guide plate remains fixed, but interference and friction between optical components and the frame occur, resulting in debris generation
Solution Approach 1:
The cushion member acts as a protective intermediary that prevents direct friction between the light guide plate/optical components and the frame. By absorbing compression forces and providing a compliant interface, it eliminates the relative motion that would generate harmful debris while maintaining stable positioning.
Solution Approach 2:
The cushion member converts the potentially harmful compression force from thermal expansion into a beneficial cushioning effect. Instead of allowing this force to cause friction and debris generation, the cushion member utilizes the compression to maintain contact and positioning while preventing harmful interactions with the frame.
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
Prevents optical component displacement and friction, maintaining light-emitting efficiency and optical quality, and improving yield rates in environmental tests, reducing failure costs and enhancing customer confidence.
Implementation Method 1
the deformation of the cushion member may prevent the light guide plate and the optical films and other optical components thereon from being displaced upward
Implementation Method 2
When the light guide plate expands in a high-temperature environment, causing the cushion member to be compressed by the light guide plate
Implementation Method 3
When the light guide plate expands in a high-temperature environment
Data Source
AI summary
A cushion member has a lower portion and a side portion extending from the base portion, and the lower portion abuts against a side wall of a backlight module, and a light guide plate is mounted on the cushion member. A display device is provided and includes the aforementioned backlight module, using the cushion member to support the light guide plate.