LCD Pixel Electrode Domain Segmentation for Viewing Angle

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Solution Overview

Problem

Liquid crystal display (LCD) panels with narrow viewing angles due to misalignment and reduced aperture ratio caused by patterning processes for multi-domain structures, leading to compromised side visibility and potential texture appearance at domain boundaries.

Innovation Solution

A display substrate with a pixel electrode comprising multiple electrode portions of varying widths and intervals in sub-pixel areas, along with connection electrodes, to define multiple domains and improve side visibility by preventing texture formation at domain boundaries, and the use of cured reactive mesogen layers with pretilt angles for alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a patterning process is used to dispose the slit pattern or the protrusion pattern on the pixel electrode and the common electrode for multi-domain structure, then the viewing angle is widened, but misalignment between the two substrates occurs and the aperture ratio is reduced

Engineering Contradiction:

Improveviewing angleVSAvoidalignment between substrates

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The pixel electrode is divided into multiple electrode portions (first electrode portions and second electrode portions) with different widths and intervals, creating multiple domains within each pixel. This segmentation allows different viewing angle characteristics in different domains, achieving wide viewing angle without requiring complex patterning processes on both substrates.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of creating the multi-domain structure through patterning on both the pixel electrode and common electrode (conventional approach), this invention inverts the approach by creating the multi-domain structure solely through the pixel electrode configuration with varying electrode portion widths and intervals, eliminating the need for corresponding patterns on the common electrode.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

Engineering Contradiction:

Improveviewing angleVSAvoidaperture ratio

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The pixel electrode is segmented into multiple electrode portions with different widths and intervals, creating multiple domains that provide wide viewing angle. The segmentation is designed to minimize the total area occupied by electrode portions while maintaining the multi-domain structure, thereby preserving a high aperture ratio.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The widths and intervals of electrode portions are varied to create the multi-domain structure. By optimizing these parameters, the invention achieves wide viewing angle while minimizing the area occupied by electrode portions, thus maintaining high aperture ratio.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the pixel electrode has uniform electrode portions for multi-domain structure, then the manufacturing process is simplified, but texture appears at domain boundaries and side visibility is reduced

Engineering Contradiction:

Improveelectrode structure uniformityVSAvoidside visibility

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Different regions of the pixel electrode have different electrode portion characteristics (widths and intervals). The first electrode portions have different dimensions than the second electrode portions, creating local variations that prevent texture formation at domain boundaries and improve side visibility while maintaining manufacturing simplicity.

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

Enhances side visibility and maintains optimized front visibility by reducing misalignment and aperture ratio issues, while preventing texture formation at domain boundaries through the strategic arrangement of electrode portions and alignment layers.

Implementation Method 1

the use of cured reactive mesogen layers with pretilt angles for alignment

Methodology Applied

Scientific EffectPretilt angle alignment:

Data Source

PatentUS8570473B2Display substrate, liquid crystal display panel having the same, and method of manufacturing the liquid crystal display panel

Publication Date: 2013.10.29 SAMSUNG DISPLAY CO LTD

AI summary

A display substrate includes a base substrate on which a pixel area is defined. The pixel area includes a first sub-pixel area and a second sub-pixel area. A plurality of first electrode portions is disposed at a first interval in the first sub-pixel area, and a plurality of second electrode portions is disposed at a second interval in the second sub-pixel area. The first electrode portion has a first width, and the second electrode portion has a second width. The first width of the first electrode portion is different from the second width of the second electrode portion, or the first interval between adjacent first electrode portions is different from the second interval between adjacent second electrode portions.