Retaining Wall Sealant Structure for Display Panel Light Leakage

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Solution Overview

Problem

TFT-LCD display panels experience light leakage issues due to the low elasticity of traditional sealants, which are exacerbated by uneven support during manufacturing, leading to deformation and phase retardation effects, especially in the peripheral areas when pressed.

Innovation Solution

Incorporating a first retaining wall within the sealing member with a lower elastic modulus than the sealant, allowing for increased elasticity and reduced sealant thickness, thereby alleviating light leakage and simplifying manufacturing processes by eliminating the need for supporters like silicon spheres.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional sealant is used for sealing the display panel, then the sealing function is achieved, but the elasticity is insufficient causing light leakage in peripheral areas

Engineering Contradiction:

Improvesealing performanceVSAvoidlight leakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a composite sealing member consisting of a first sealant and a second sealant with different elastic moduli. The first sealant provides primary sealing while the second sealant with higher elasticity compensates for deformation in peripheral areas, preventing light leakage. This composite structure combines the advantages of both materials to achieve reliable sealing without light leakage.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies different sealant materials to different regions of the sealing member. The first sealant is used in the main sealing area while the second sealant with higher elasticity is applied in peripheral areas prone to deformation. This localized differentiation addresses the specific light leakage problem in peripheral regions without compromising overall sealing performance.

Inventive Principle:

Principle #3Local quality

2Reliability

If sealant thickness is increased to improve sealing, then sealing performance is enhanced, but manufacturing complexity increases due to need for supporters

Engineering Contradiction:

Improvesealing performanceVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the elastic modulus parameter of the sealant material by introducing a second sealant with higher elasticity. This parameter change allows the sealant to maintain effective sealing performance with reduced thickness, eliminating the need for additional supporters and simplifying the manufacturing process while maintaining reliability.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If uniform sealant distribution is maintained, then manufacturing is simplified, but elasticity in peripheral areas is insufficient

Engineering Contradiction:

Improvesealant application easeVSAvoidlight leakage in peripheral areas

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

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 design enhances the sealing member's elasticity, reducing light leakage occurrences and susceptibility to deformation upon pressure, while also simplifying the manufacturing process by eliminating the need for additional supporters, resulting in improved display panel performance and production efficiency.

Implementation Method 1

elastic modulus of a material of the first sealant is greater than elastic modulus of a material of the first retaining wall

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP3581999B1Display panel, manufacturing method therefor, display device, and substrate

Publication Date: 2022.11.30 BOE TECHNOLOGY GROUP CO LTD

Figure 1a~3a
Figure 3b~4c
Figure 5a~6b

AI summary

A display panel, a manufacturing method thereof, and a display device are provided. The display panel has a display area (10) and a peripheral area (11) surrounding the display area (10), the display panel includes a first substrate (101), a second substrate (102) disposed opposite to the first substrate (101), and a sealing member (110). The sealing member (110) is disposed between the first substrate (101) and the second substrate (102) and located in the peripheral area (11), and configured to hermetically connect the first substrate (101) and the second substrate (102), the sealing member (101) includes a first sealant (111) and a first retaining wall (112), an orthographic projection of the first retaining wall (112) on the second substrate (102) is at least partially overlapped with an orthographic projection of the first sealant (111) on the second substrate (102), and elastic modulus of a material of the first sealant (111) is greater than elastic modulus of a material of the first retaining wall (112). By means of adding a first retaining wall in a sealing member, the display panel can increase elasticity of the sealing member to alleviate light leakage phenomenon at a fixed position in the peripheral area of the display panel and reduce the susceptibility to light leakage upon the panel being pressed. In addition, the sealing member plays a supporting role to the display panel to reduce a thickness of a sealant, so as to simplify manufacturing processes of the sealant.