Liquid Crystal Display Panel Photo Spacer Segmentation

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Solution Overview

Problem

Liquid crystal display panels face issues with light leakage and mura defects due to uneven alignment films caused by photo spacers, which are exacerbated by bending, leading to scratches and alignment deviations.

Innovation Solution

The implementation of photo spacers that are opposite to each other and capable of shifting relative to each other, with truncated cone structures and recessed ends, reduces level differences and minimizes the risk of scratching alignment films, ensuring consistent alignment and support even in bent states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If photo spacers are used to maintain distance between substrates, then the liquid crystal cell thickness is controlled, but a level difference is formed that causes uneven alignment layers and light leakage

Engineering Contradiction:

Improveliquid crystal cell thicknessVSAvoidlevel difference causing light leakage

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The photo spacer is divided into two separate photo spacers (first photo spacer on color filter substrate, second photo spacer on array substrate) that are opposite to each other. This segmentation allows each spacer to be independently positioned and sized, enabling them to cancel out the level difference effect while maintaining the required cell thickness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The two photo spacers are designed with different heights at different positions (first photo spacer height + second photo spacer height = distance between substrates). This local quality variation allows the spacers to compensate for the level difference locally at each substrate interface, preventing uneven alignment layers.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If photo spacers are used to support substrates, then the liquid crystal cell structure is stabilized, but the photo spacer may scratch the alignment film when the display panel is bent

Engineering Contradiction:

Improveliquid crystal cell structureVSAvoidalignment film scratching

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

By dividing the single photo spacer into two separate spacers located on different substrates, the invention eliminates the scenario where one spacer scratches the alignment film during bending. Each spacer only contacts its respective substrate and the liquid crystal layer, not the alignment film on the opposite substrate.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The liquid crystal layer acts as an intermediary between the two photo spacers. The spacers are positioned on opposite substrates with the liquid crystal layer in between, preventing direct contact between spacers and alignment films during bending operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If photo spacers are made larger to ensure support, then the structural stability is improved, but the aperture ratio is reduced

Engineering Contradiction:

Improvestructural supportVSAvoidaperture ratio

Core Design Contradiction:

Stability of the object's compositionVSArea of stationary object

Solution Approach 1:

The support function is segmented and distributed to two photo spacers located on opposite substrates. This allows each spacer to be smaller in size while collectively providing the necessary structural support, thereby maintaining a higher aperture ratio.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a single large spacer, the invention uses two smaller spacers positioned at different locations (on different substrates). This spatial redistribution in three-dimensional space maintains structural stability while reducing the footprint area that would otherwise block light.

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

This design effectively prevents light leakage and mura defects, increases the aperture ratio, and maintains a high resolution display by reducing the bottom size of the photo spacers while ensuring secure support and alignment.

Implementation Method 1

the photo spacers are used to maintain a distance between the color filter substrate and the array substrate

Methodology Applied

Scientific EffectPhoto spacer support:

Implementation Method 2

photo spacers having truncated cone structures and recessed ends

Methodology Applied

Scientific EffectGeometry: Geometry

Data Source

PatentUS10114252B2Liquid crystal display panel and liquid crystal display device

Publication Date: 2018.10.30 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present invention provides a liquid crystal display panel and a liquid crystal display device including the liquid crystal display panel. The liquid crystal display panel comprises a color filter substrate and an array substrate opposite to each other, a side of the color filter substrate facing the array substrate is provided with a first photo spacer, a side of the array substrate facing the color filter substrate is provided with a second photo spacer at a position corresponding to that of the first photo spacer, and an end of the first photo spacer far away from the color filter substrate and an end of the second photo spacer far away from the array substrate can shift relative to each other.