Common Electrode Slit Pattern for LCD Display Stability

Solution Overview

Problem

In the manufacturing of display apparatus with liquid crystal display (LCD) panels, the patterning process requires high accuracy to avoid broken wires and ensure stable electronic properties, but poor design can lead to decreased conformity rates and display quality.

Innovation Solution

A display apparatus with a common electrode layer featuring a special pattern of slits over the pixel electrode layer, where the slit end portions are designed to compress dark crinkles near gate lines, preventing electric field interference and ensuring proper shielding of data lines, thereby enhancing display stability and conformity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the common electrode layer is formed as a continuous layer over the pixel electrode layer, then the shielding effect against data lines is improved, but dark crinkles occur near gate lines and electric field interference increases

Engineering Contradiction:

Improveelectric field interferenceVSAvoiddisplay quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The common electrode layer is divided into multiple isolated electrode regions by introducing slits, which segment the continuous electrode structure. This segmentation allows the electrode to be positioned at specific locations (near data lines) to provide shielding, while avoiding continuous coverage that causes dark crinkles near gate lines. The slits create discrete electrode segments that can be strategically placed to address specific interference issues without causing unwanted side effects.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The common electrode layer is designed with non-uniform characteristics: electrodes are present in some regions (near data lines for shielding) and absent in other regions (near gate lines to avoid dark crinkles). This local quality variation allows the structure to provide shielding where needed while avoiding harmful effects where they would occur, optimizing performance in different spatial zones.

Inventive Principle:

Principle #3Local quality

2Reliability

If the common electrode layer is patterned with slits to prevent dark crinkles, then display quality is improved, but shielding effectiveness against data lines may be reduced

Engineering Contradiction:

Improvedisplay qualityVSAvoidelectric field interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The common electrode layer is divided into multiple isolated electrode regions by introducing slits, which segment the continuous electrode structure. This segmentation allows the electrode to be positioned at specific locations (near data lines) to provide shielding, while avoiding continuous coverage that causes dark crinkles near gate lines. The slits create discrete electrode segments that can be strategically placed to address specific interference issues without causing unwanted side effects.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The common electrode layer is designed with non-uniform characteristics: electrodes are present in some regions (near data lines for shielding) and absent in other regions (near gate lines to avoid dark crinkles). This local quality variation allows the structure to provide shielding where needed while avoiding harmful effects where they would occur, optimizing performance in different spatial zones.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If high accuracy is required in the patterning process to avoid broken wires, then manufacturing precision is improved, but production time and complexity increase

Engineering Contradiction:

Improvepatterning accuracyVSAvoidprocess complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The slit pattern in the common electrode layer is designed in advance to account for potential patterning variations. By pre-positioning slits at strategic locations, the design anticipates and compensates for manufacturing tolerances, reducing the risk of broken wires without requiring extremely tight process control. This preliminary design consideration simplifies the actual manufacturing process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The slit width, length, and positioning parameters are optimized to provide robust performance across a range of manufacturing tolerances. By designing slits with appropriate dimensions and locations, the structure maintains its functionality even when patterning accuracy varies within normal process limits, reducing the need for ultra-precise manufacturing.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10747059B2Display apparatus having pattern of slits on top-common electrode

Publication Date: 2020.08.18 RED OAK INNOVATIONS LTD

AI summary

A display apparatus including a first substrate, a second substrate and a display medium is provided. The display medium is disposed between the first substrate and the second substrate. The first substrate includes a first data line, a second data line and a pixel. The first data line and the second data line respectively disposed over a first base plate. The pixel includes a pixel electrode layer and a common electrode layer. The pixel electrode layer is electrically connected to one of the first data line and the second data line. The common electrode layer is formed over the pixel electrode layer and includes a first slit nearest to the first data line. The first slit has a first end and a second end. The first slit is bent at the first end of the first slit but is not bent at the second end of the first slit.