Display Device Pseudo-Line-Inversion Drive Scheme Disclination

Solution Overview

Problem

Liquid crystal display devices face issues with disclination due to lateral electric fields between adjacent pixels with different polarities, leading to image lag, blurring, and reduced contrast ratio, particularly in reflective displays where the line-inversion drive scheme increases energy consumption.

Innovation Solution

The implementation of a pseudo-line-inversion drive scheme where the polarities of adjacent pixels in the same direction are made similar, while using the column-inversion drive scheme, to suppress disclination while optimizing optical properties and reducing energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the line-inversion drive scheme is used to suppress disclination, then display quality is improved, but energy consumption is increased

Engineering Contradiction:

Improvedisplay qualityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments the pixel array into multiple regions with different polarity patterns. Instead of inverting polarity across entire lines, the display divides pixels into first and second regions with different polarity arrangements, allowing selective suppression of disclination in critical areas while maintaining energy efficiency in other regions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different polarity drive schemes to different spatial regions of the display. The first region uses one polarity pattern while the second region uses another, allowing local optimization of display quality where disclination occurs while maintaining lower energy consumption in regions where it is less problematic.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If the column-inversion drive scheme is used to reduce energy consumption, then energy efficiency is improved, but disclination occurs between adjacent pixels

Engineering Contradiction:

Improveenergy consumptionVSAvoiddisplay quality

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent segments the pixel array into multiple regions with different polarity patterns. Instead of inverting polarity across entire lines, the display divides pixels into first and second regions with different polarity arrangements, allowing selective suppression of disclination in critical areas while maintaining energy efficiency in other regions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different polarity drive schemes to different spatial regions of the display. The first region uses one polarity pattern while the second region uses another, allowing local optimization of display quality where disclination occurs while maintaining lower energy consumption in regions where it is less problematic.

Inventive Principle:

Principle #3Local quality

3Reliability

If a light-shielding film is used to block light at disclination areas, then display failures are eliminated, but the opening area is reduced

Engineering Contradiction:

Improvedisplay qualityVSAvoidopening area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent extracts and eliminates the root cause of disclination through polarity control rather than using light-shielding films. By addressing the electrical field issue at its source through drive scheme design, the need for physical light-blocking structures is removed, preserving the full opening area.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the harmful lateral electric field effect into a beneficial outcome by using the same electrical field mechanism to control liquid crystal orientation. Through careful polarity arrangement, the electric field that causes disclination is reconfigured to maintain uniform alignment, turning a harmful effect into a useful alignment mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 approach improves display quality by reducing disclination and energy consumption by maintaining optimized optical properties and suppressing lateral electric fields between adjacent pixels.

Implementation Method 1

In a liquid crystal display device in a mode of electrically controlled birefringence (ECB) or the like, liquid crystal molecules are undesirably influenced by a lateral electric field

Methodology Applied

Scientific EffectElectrically controlled birefringence: Birefringence

Data Source

PatentUS11183132B2Display device

Publication Date: 2021.11.23 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a display device, includes a first pixel line including a first sub-pixel and a second sub-pixel, a second pixel line including a third sub-pixel and a fourth sub-pixel, and a display driver supplying video signals which cause signal polarities of signal lines adjacent to each other to be opposite to each other, without varying the polarities in one frame period, the video signals having the same polarities as each other being written to the respective sub-pixels of the first pixel line, the video signals having the polarities which are the same as each other and opposite to the polarities of the video signals written to the first pixel line, being written to the respective sub-pixels of the second pixel line.