Plastic Frame for Backlight Module Fixation

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Solution Overview

Problem

Existing liquid crystal display devices face issues with weak fixation and poor solidification strength when using a □-shaped tape to connect the panel and backlight module, leading to unqualified glue points, wire drawing, and difficulty in disassembly during reworking.

Innovation Solution

A plastic frame for the backlight module is designed with a glass cover plate and edge bars, featuring an LED placing groove and cutouts for lamp beads and a flexible circuit board, which reduces the frame width and provides a placing cavity for the panel, allowing for a firmer connection using a light-shielding tape.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a □-shaped tape is used to fix the panel and plastic frame, then the connection is achieved, but the fixation strength is weak and solidification strength is poor

Engineering Contradiction:

Improvefixation strengthVSAvoidsolidification strength

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The plastic frame is segmented into a glass cover plate and separate edge bars, creating structural zones that distribute and enhance fixation strength at critical connection points while maintaining overall frame integrity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The plastic frame combines a glass cover plate with plastic edge bars to create a composite structure that leverages the strength and rigidity of glass at the connection interface while maintaining the flexibility and manufacturability of plastic components

Inventive Principle:

Principle #40Composite materials

2Length of stationary object

If a □-shaped tape is used to connect panel and backlight module, then connection is achieved, but the frame width cannot be reduced further

Engineering Contradiction:

Improveframe widthVSAvoidconnection ease

Core Design Contradiction:

Length of stationary objectVSEase of operation

Solution Approach 1:

The connection function is extracted from the traditional □-shaped tape and integrated directly into the plastic frame structure through the edge bars, eliminating the need for separate fixation tapes and enabling frame width reduction

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The frame structure and connection function are merged into a single integrated plastic frame assembly, where the edge bars simultaneously provide structural support and fixation capability, simplifying the overall connection mechanism

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If dispensing method is used to fix panel and backlight module, then external fixation is achieved, but glue quality issues occur such as wire drawing and dip dyeing

Engineering Contradiction:

Improvefixation methodVSAvoidglue point quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The chemical adhesive bonding system is replaced with a mechanical fixation system using the edge bars and LED placing groove structure, eliminating glue application entirely and avoiding all associated quality issues such as wire drawing and dip dyeing

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of repair

If □-shaped tape is used for fixation, then connection is achieved, but disassembly during reworking is difficult

Engineering Contradiction:

Improvedisassembly easeVSAvoidconnection strength

Core Design Contradiction:

Ease of repairVSStrength

Solution Approach 1:

The fixation system transitions from a permanent adhesive bond to a mechanical interlocking structure that can be dynamically assembled and disassembled, allowing the edge bars to be removed and repositioned during reworking while maintaining strong connection during operation

Inventive Principle:

Principle #15Dynamics

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 enhances the connection between the panel and backlight module, reducing the frame width and ensuring a more secure fixation without the need for a backboard, facilitating easier reworking and alignment of components.

Implementation Method 1

a reflective sheet fixed on one side of the plastic frame through a double-sided tape

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Implementation Method 2

a light guide plate provided in the plastic frame located on the reflective sheet

Methodology Applied

Scientific EffectLight transmission: Light

Implementation Method 3

an optical film set provided in the plastic frame and located on the light guide plate

Methodology Applied

Scientific EffectOptical modulation: Filter (optical)

Data Source

PatentUS10180535B1Plastic frame for backlight module and backlight module, and liquid crystal display module

Publication Date: 2019.01.15 WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD

AI summary

The present disclosure provides a plastic frame for a backlight module. The plastic frame includes a glass cover plate, and edge bars including a first edge bar provided with an LED placing groove for insertion of lamp beads of the light bars and a second edge bar, that are provided at two opposite sides of the glass cover plate close to an edge, respectively, wherein the LED placing groove passes through one side of the first edge bar being opposite to the second edge bar and one side of the first edge bar deviating away from the second edge bar. The present disclosure also provides a backlight module and a liquid crystal display module.