Liquid Crystal Display Pixel Electrode Segmentation for Orientation Control

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Solution Overview

Problem

Existing liquid crystal display panels face challenges in maintaining high display quality and aperture ratio when pixel pitch is small, as monodomain electrode shapes lead to decreased liquid crystal orientation ability and display anomalies like residual images and decreased aperture ratio.

Innovation Solution

A liquid crystal display panel design featuring a pixel electrode with a uniformly planar region and finely patterned electrode regions along data wiring lines, where the patterned regions branch out from multiple locations, satisfying the relational formula LB/Lpix=0.3 to 0.6, to improve orientation control and reduce aperture ratio degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a monodomain electrode shape is used, then the aperture ratio is maintained, but liquid crystal orientation ability decreases and display anomalies occur

Engineering Contradiction:

Improveliquid crystal orientation abilityVSAvoiddisplay anomalies like residual images

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The pixel electrode is divided into multiple electrode units (first, second, and third electrode units) with different shapes and positions. The first electrode unit has a substantially square shape, the second has a substantially rectangular shape, and the third has a substantially triangular shape. This segmentation allows each electrode unit to contribute to different aspects of liquid crystal orientation, improving overall orientation ability while maintaining aperture ratio.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel electrode are given different local characteristics through the varied shapes and positions of electrode units. The square, rectangular, and triangular electrode units create diverse electric field distributions in different areas, which locally optimize liquid crystal orientation while collectively maintaining the overall aperture ratio.

Inventive Principle:

Principle #3Local quality

2Reliability

If multiple electrode units are provided in each pixel, then liquid crystal orientation control is improved, but aperture ratio decreases

Engineering Contradiction:

Improveliquid crystal orientation controlVSAvoidaperture ratio

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Multiple electrode units are electrically connected through connecting portions to function as a single pixel electrode. The first, second, and third electrode units are connected via connecting portions to maintain the same potential, allowing them to work together as one integrated electrode while providing multiple orientation control regions. This merging approach improves orientation control without significantly reducing the overall aperture ratio.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If the pixel pitch is made small, then display resolution is improved, but maintaining high aperture ratio and orientation ability becomes difficult

Engineering Contradiction:

Improvedisplay resolutionVSAvoidaperture ratio

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The pixel electrode is segmented into multiple electrode units with different shapes (square, rectangular, triangular) that can be efficiently packed within the limited pixel area. This segmentation allows for better space utilization and maintains aperture ratio even at small pixel pitches while providing sufficient electrode area for orientation control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode units use asymmetric shapes (rectangular and triangular) in addition to the square shape, allowing for more flexible arrangement and packing within the pixel area. This asymmetric design optimizes the use of available space at small pixel pitches while maintaining the necessary electrode surface area for effective liquid crystal orientation.

Inventive Principle:

Principle #4Asymmetry

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 enhances display quality by improving response characteristics, reducing residual image disappearance time, and mitigating transmittance loss while maintaining a high aperture ratio, even at small pixel pitches.

Implementation Method 1

when a voltage is applied thereto, the liquid crystal molecules are inclined in eight directions from the protrusion 124

Methodology Applied

Scientific EffectElectric field: Electric Field

Implementation Method 2

a method of performing orientation control of liquid crystal is proposed in which a plurality of electrode units smaller than one pixel are provided in each pixel

Methodology Applied

Scientific EffectLiquid crystal orientation: Liquid Crystals

Data Source

PatentUS9195101B2Liquid crystal display panel comprising a pixel electrode that includes one uniformly planar electrode region and one or more finely patterned electrode regions

Publication Date: 2015.11.24 SHARP KK

AI summary

Each of the pixel electrodes that are disposed in a liquid crystal display panel of one embodiment of the present invention is constituted of minutely patterned electrode regions (a first minutely patterned electrode region and a second minutely patterned electrode region), and one solid electrode region, and the length Lpix of each of the pixel electrodes in a direction along a data line, and the total length LB of the minutely patterned electrode regions satisfies the relationship of LB/Lpix=0.3 to 0.6.