Liquid Crystal Display Polarity Inversion for Flicker Suppression

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Solution Overview

Problem

High-definition liquid crystal displays in mobile communication terminals face challenges in achieving low power consumption and preventing display degradation such as flicker, especially with high pixel density and the need for prolonged battery life.

Innovation Solution

The liquid crystal display device employs a column inversion drive scheme with polarity inversion, where gradation signals of opposite polarities are applied to different columns of pixels in each frame period, and a color filter arrangement that includes a transparent filter alongside red, green, and blue filters, to minimize brightness differences and suppress flicker, thereby enhancing display quality and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If pixel size is reduced to achieve high definition (300 ppi or more), then resolution is improved, but power consumption increases and display degradation occurs

Engineering Contradiction:

ImproveresolutionVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic polarity inversion to pixel electrodes, alternating between positive and negative polarity in successive frame periods. This periodic action balances the accumulation of electric charge over time, reducing the need for excessive driving voltage and thereby lowering power consumption in high-resolution displays

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent inverts the polarity of driving signals applied to pixel electrodes in alternating frame periods. By applying positive polarity in one frame and negative polarity in the next, the system compensates for charge accumulation effects, enabling high-resolution displays to operate at lower power levels

Inventive Principle:

Principle #13The other way round (Inversion)

2Measurement precision

If pixel size is reduced to achieve high definition (300 ppi or more), then resolution is improved, but display degradation such as flicker occurs

Engineering Contradiction:

ImproveresolutionVSAvoiddisplay quality

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent implements periodic polarity inversion across pixel electrodes in alternating frame periods. This periodic action equalizes the electrical stress on liquid crystal molecules over time, preventing the accumulation of residual charges that cause flicker and other display degradation in high-resolution displays

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent inverts the polarity of signals applied to pixel electrodes between consecutive frame periods. This inversion compensates for asymmetric electrical effects in the liquid crystal cell, eliminating flicker and maintaining display quality in high-resolution configurations

Inventive Principle:

Principle #13The other way round (Inversion)

3Use of energy by moving object

If transparency of pixel electrodes is increased, then power consumption is reduced, but manufacturing precision becomes more difficult to control

Engineering Contradiction:

Improvepower consumptionVSAvoidfilm thickness control

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The patent changes the electrical parameters of pixel electrodes by applying alternating positive and negative polarity signals. This parameter change compensates for variations in electrode transparency and liquid crystal layer thickness, enabling precise display performance even when manufacturing tolerances cause variations in film thickness

Inventive Principle:

Principle #35Parameter changes

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 effectively suppresses display degradation like flicker, maintains excellent display quality, and reduces power consumption, enabling longer battery life in high-resolution mobile devices.

Implementation Method 1

a liquid crystal layer held between the array substrate and the counter substrate

Methodology Applied

Scientific EffectLiquid crystal orientation control: Liquid Crystals

Implementation Method 2

pixel electrodes, the gradation signals of a given polarity are applied to a plurality of pixel electrodes facing the transparent filter

Methodology Applied

Scientific EffectElectro-optic effect: Electro-Optic Effects

Data Source

PatentUS9482895B2Liquid crystal display device with different polarity signals provided to pixel electrodes facing a transparent filter and a green filter

Publication Date: 2016.11.01 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a liquid crystal display device includes array substrate, counter substrate and liquid crystal layer. The array substrate includes a plurality of pixel electrodes, a plurality of gate lines, a plurality of source lines, a plurality of switching elements, a gate driver, and a source driver. The counter substrate includes a color filter. In each frame period, gradation signals of given polarity are applied to a plurality of pixel electrodes facing the transparent filter, while gradation signals of the reverse polarity are applied to a plurality of pixel electrodes facing the green filter.