Segmented Rubber Frame for Backlight Module Light Leakage

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Solution Overview

Problem

Conventional one-piece rubber frames in backlight modules cause stress-induced COG mura and light leakage due to direct contact with bent FPCs, leading to increased manufacturing costs and low producibility.

Innovation Solution

A rubber frame with an annular design featuring a separate first portion for the FPC, coupled in a snap-fit manner to other portions, preventing direct contact and allowing for a sufficient gap to avoid stress and light leakage, while maintaining structural strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a one-piece rubber frame structure is used to fix the machine to the module, then the assembling is performed before cover plate attachment, but L0 light leakage occurs seriously

Engineering Contradiction:

Improveassembling processVSAvoidL0 light leakage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The rubber frame is divided into multiple segments along its circumferential direction, with at least one gap between adjacent segments. This segmentation allows the cover plate to be attached first, then the rubber frame segments are assembled afterward, eliminating L0 light leakage while maintaining ease of manufacture.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If the rubber frame is of a one-piece structure to fix the entire machine, then the structure is simple, but the FPC contacts the rubber frame at the bent position causing COG mura

Engineering Contradiction:

Improverubber frame structureVSAvoidCOG mura

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The rubber frame is segmented circumferentially with gaps positioned to avoid contact with the bent FPC region. This prevents stress-induced COG mura while keeping the overall structure relatively simple and easy to manufacture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rubber frame has different properties in different regions: gaps are created locally at positions where the FPC bends to prevent contact and stress, while other regions maintain continuous rubber structure to provide sealing and fixing functions.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If avoidance structure is directly provided on the rubber frame at the DP side, then FPC contact is prevented, but the structural strength is low affecting assembling

Engineering Contradiction:

ImproveFPC contact stressVSAvoidrubber frame strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The rubber frame is divided into multiple segments that are assembled together to form the complete frame. This segmentation creates avoidance of FPC contact while the segments themselves maintain sufficient structural strength for assembling, as each segment can be independently manufactured with appropriate thickness and material properties.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240402536A1Rubber frame, backlight module and display device

Publication Date: 2024.12.05 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

The present disclosure provides a rubber frame for supporting a display panel. A flexible printed circuit board is coupled to a binding end of the display panel, the rubber frame includes an annular frame body, the annular frame body includes a first portion corresponding to the flexible printed circuit board, and the first portion is separated from the other portions of the annular frame body. The present disclosure further provides a backlight module and a display device.