Display Panel Groove Alignment Film Anchoring

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Solution Overview

Problem

In liquid crystal displays, a relatively weak electric field in areas directly opposite to slits on the pixel electrode results in insufficient transmission strength, leading to dark spots and dark lines affecting the display effect.

Innovation Solution

The array substrate features a buffer layer with grooves opposite to the slits on the pixel electrode, allowing for a thicker alignment film that increases the anchoring force on liquid crystal molecules, enhancing their deflection and transmission strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a slit is defined on the pixel electrode to control pre-tilt angle, then liquid crystal orientation control is improved, but electric field strength in the area opposite to the slit decreases

Engineering Contradiction:

Improveliquid crystal pre-tilt angle controlVSAvoidelectric field strength

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

The alignment film thickness is locally increased in the groove area opposite to the slit, creating non-uniform thickness distribution. This local thickening compensates for the weak electric field in that specific region by enhancing anchoring force, while other areas maintain their original alignment film thickness and electric field characteristics.

Inventive Principle:

Principle #3Local quality

2Strength

If the alignment film thickness is increased in the groove area, then anchoring force to liquid crystal molecules is improved, but the complexity of the buffer layer structure increases

Engineering Contradiction:

Improveanchoring forceVSAvoidbuffer layer structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The grooves are pre-formed in the buffer layer before the alignment film is deposited. This preliminary structuring allows the alignment film to naturally conform to the groove geometry during deposition, achieving localized thickening without requiring complex post-processing or additional structural components.

Inventive Principle:

Principle #10Preliminary action

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 configuration improves the deflection angle and transmission strength of liquid crystals, reducing dark spots and lines, and thus enhancing the display panel's performance.

Implementation Method 1

an increase in the thickness of the alignment film increases an anchoring force to liquid crystal molecules

Methodology Applied

Scientific EffectAnchoring force: Adsorption

Implementation Method 2

a pixel electrode and a common electrode for generating an electric field to control orientations of the liquid crystal molecules

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS12298630B2Display panel and array substrate thereof

Publication Date: 2025.05.13 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

The present application provides a groove in an area on a buffer layer that is directly opposite to a slit of a pixel electrode, so as to accommodate an alignment film in a corresponding area and increase a thickness of the alignment film. An increase in the thickness of the alignment film increases an anchoring force to liquid crystal molecules in the corresponding area, which makes the liquid crystal molecules in the corresponding area be deflected more easily, thereby solving a technical problem in the prior art that a relatively weak electric field in the area directly opposite to the slit results in an insufficient deflection angle of liquid crystals and insufficient transmission strength in this area.