Backlight Module Cushion Layout to Prevent Light Guide Plate Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Edge-lit backlight modules experience optical component displacement and interference due to rubber components compressing the light guide plate in high-temperature environments, leading to debris generation and optical issues.

Innovation Solution

A cushion member with a lower and side portion is used to support the light guide plate, forming a gap with the back cover side wall to accommodate deformation, preventing upward displacement and interference.

Engineering Contradictions & Design Principles

VSEngineering 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 interference and friction

Engineering Contradiction:

Improvelight guide plate fixationVSAvoidoptical component displacement and interference

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

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 compression of the light guide plate by the back cover, thereby eliminating the harmful displacement of optical components while maintaining secure fixation.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 carefully selecting these parameters, the system accommodates thermal expansion without causing optical component displacement, resolving the contradiction between fixation stability and harmful factor prevention.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the cushion member is tightly attached to the back cover side wall, then the structure is stable, but the cushion member cannot accommodate its own deformation when the light guide plate expands

Engineering Contradiction:

Improvecushion member positioningVSAvoidcushion member deformation capacity

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The cushion member is designed with a segmented structure consisting of a lower portion and a side portion. The lower portion provides stable attachment to the back cover, while the side portion extends upward to abut against the side wall, creating a gap that accommodates deformation. This segmentation allows the cushion member to maintain positioning stability while adapting to thermal expansion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cushion member utilizes the vertical dimension by extending its side portion upward to abut against the side wall. This creates a gap in the vertical direction that accommodates deformation, while maintaining stable attachment in the horizontal plane. The solution transforms a two-dimensional attachment problem into a three-dimensional space-utilization problem.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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, maintains optical quality, and reduces debris generation, improving yield rates and customer confidence in high-temperature tests.

Implementation Method 1

When the light guide plate expands in a high-temperature environment, causing the cushion member to be compressed by the light guide plate, 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

Methodology Applied

Scientific EffectDeformation: Deformation

Implementation Method 2

When the light guide plate expands in a high-temperature environment

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS12493215B2Backlight module and display device

Publication Date: 2025.12.09 RADIANT OPTO ELECTRONICS CORP

AI summary

A backlight module is provided and includes a side wall, a cushion member, and a light guide plate. The cushion member has a lower portion and a side portion extending from the lower portion, and the side portion abuts against the side wall, and the 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.