Liquid Crystal Display Panel with Common Electrode Opening

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Conventional liquid crystal display panels face challenges in achieving uniform transmittance and luminance due to non-uniform arrangement of liquid crystal molecules, particularly in pixel regions, which affects image quality and display efficiency.

Innovation Solution

A display panel design featuring a first substrate with a pixel electrode and a second substrate with a common electrode having a circular opening, where the opening's diameter is strategically sized relative to the pixel electrode, and both substrates are covered with vertical orientation layers, along with protrusions outside the pixel electrode to support the substrates and enhance molecular alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional liquid crystal display panels are used, then the basic display function is achieved, but uniform transmittance and luminance cannot be achieved due to non-uniform arrangement of liquid crystal molecules

Engineering Contradiction:
Improveluminance uniformityVSAvoidmolecular arrangement uniformity
Core Design Contradiction:
Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by creating a non-uniform common electrode with a specific geometric pattern (circles arranged in a grid) that generates a tailored electric field distribution. This localized structural modification ensures uniform liquid crystal molecule arrangement specifically in the pixel region, thereby achieving uniform luminance without requiring uniform manufacturing conditions across the entire display panel.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent changes the geometric parameters of the common electrode, transforming it from a conventional flat structure to one with circular openings of specific diameter and spacing. This parameter modification alters the electric field distribution, enabling precise control over liquid crystal molecule orientation and achieving uniform molecular arrangement and consistent optical properties across the display.

Inventive Principle:
Principle #35Parameter changes

2Illumination intensity

If the common electrode is modified with an opening to improve molecular arrangement, then transmittance and luminance uniformity improve, but the device structure becomes more complex

Engineering Contradiction:
Improvetransmittance uniformityVSAvoidelectrode structure complexity
Core Design Contradiction:
Illumination intensityVSDevice complexity

Solution Approach 1:

The patent segments the common electrode into multiple isolated circular regions rather than using a continuous structure. This segmentation creates distinct electric field zones that independently control liquid crystal molecules in different pixel regions, achieving uniform molecular arrangement across the entire display while maintaining a relatively simple fabrication process.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Instead of modifying the pixel electrode or adding complex alignment layers, the patent inverts the approach by modifying the common electrode structure. This inversion simplifies the overall device complexity because the common electrode is already part of the standard display structure, and its geometric modification is easier to implement than adding new components or complex alignment mechanisms.

Inventive Principle:
Principle #13The other way round (Inversion)

3Illumination intensity

If the opening diameter is increased to improve molecular alignment, then luminance uniformity improves, but the area of the common electrode decreases affecting overall display performance

Engineering Contradiction:
Improveluminance uniformityVSAvoidcommon electrode area
Core Design Contradiction:
Illumination intensityVSArea of stationary object

Solution Approach 1:

The patent applies partial action by using circular openings that cover only a portion of the pixel electrode area. The opening diameter is specifically designed to be between 1/3 to 2/3 of the pixel electrode side length, providing sufficient electric field penetration for uniform molecular alignment while preserving enough common electrode area to maintain overall display performance and electro-optical characteristics.

Inventive Principle:
Principle #16Partial or excessive 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 design allows for controlled molecular arrangement of liquid crystals when a voltage is applied, improving transmittance and luminance uniformity by ensuring uniform influence on liquid crystal molecules, thereby enhancing display performance.

Implementation Method 1

both substrates are covered with vertical orientation layers... controlled molecular arrangement of liquid crystals

Methodology Applied
Scientific EffectLiquid crystal alignment: Liquid Crystals

Implementation Method 2

A deflection of liquid crystal molecules is controlled by an electric field, so as to control intensity of light

Methodology Applied
Scientific EffectElectric field effect on liquid crystals: Electric Field

Data Source

PatentUS10509272B2Display panel and display apparatus
Publication Date: 2019.12.17 BOE TECHNOLOGY GROUP CO LTD
  • US10509272B2 patent drawing
  • US10509272B2 patent drawing
  • US10509272B2 patent drawing

AI summary

A display panel and a display apparatus includes the display panel. The display panel includes a first substrate, a second substrate and a liquid crystal layer between the first substrate and the second substrate. The first substrate and the second substrate are disposed opposite to each other, the first substrate comprises a pixel electrode, the second substrate comprises a common electrode, and the common electrode is formed with an opening.