Liquid Crystal Display Dual Pixel Electrode Voltage Control

Solution Overview

Problem

Liquid crystal display devices face a challenge in achieving high response speed and high transmittance while minimizing power consumption, as reducing the cell gap to enhance responsiveness leads to decreased transmittance, and existing methods to increase transmittance, such as providing opening portions in the color filter, compromise responsiveness.

Innovation Solution

The implementation of a liquid crystal display device with a dual filter region system, where a first filter region has standard transmittance and a second high transmittance region, each with separate pixel electrodes and transistors, allowing for controlled voltage application in brightness and response speed priority modes, and a thinner color resist film in the high transmittance region to maintain high transmittance and responsiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the cell gap is reduced to enhance responsiveness, then the response speed is improved, but the transmittance decreases

Engineering Contradiction:

Improveresponse speedVSAvoidtransmittance

Core Design Contradiction:

SpeedVSIllumination intensity

Solution Approach 1:

The display panel is divided into first display regions with standard cell gap and second display regions with reduced cell gap. This segmentation allows different regions to have different response speeds while maintaining overall transmittance, as the thinner liquid crystal layer in second display regions compensates for the smaller cell gap reduction in transmittance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel are assigned different cell gap characteristics tailored to their specific functions. Second display regions requiring high responsiveness (e.g., for 3D graphics) have reduced cell gap, while first display regions prioritize transmittance and power consumption with standard cell gap.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If an opening portion is provided in the color filter to increase transmittance, then the transmittance is improved, but the cell gap at the opening portion is increased and responsiveness is decreased

Engineering Contradiction:

ImprovetransmittanceVSAvoidresponsiveness

Core Design Contradiction:

Illumination intensityVSSpeed

Solution Approach 1:

Instead of creating opening portions that locally increase cell gap and reduce responsiveness, the invention applies a uniform thin film formation process across the entire color filter substrate. This creates a slightly reduced cell gap throughout the display regions without creating localized openings that would harm responsiveness.

Inventive Principle:

Principle #3Local quality

3Speed

If the cell gap is reduced to achieve high speed driving, then the response speed is improved, but the power consumption increases due to lower transmittance

Engineering Contradiction:

Improveresponse speedVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The display panel is divided into first display regions with standard cell gap and second display regions with reduced cell gap. This segmentation allows different regions to have different response speeds while maintaining overall transmittance, as the thinner liquid crystal layer in second display regions compensates for the smaller cell gap reduction in transmittance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel are assigned different cell gap characteristics tailored to their specific functions. Second display regions requiring high responsiveness (e.g., for 3D graphics) have reduced cell gap, while first display regions prioritize transmittance and power consumption with standard cell gap.

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

This approach enables the liquid crystal display device to maintain high transmittance while reducing power consumption and achieving the required high response speed for displaying 3-D graphics, by optimizing voltage control and film thickness in different modes.

Implementation Method 1

an image is displayed by changing an electric field in a liquid crystal layer to change alignment of a liquid crystal composition, thereby controlling the transmittance

Methodology Applied

Scientific EffectLiquid crystal alignment control: Liquid Crystals

Implementation Method 2

a color filter employing a dyeing method is deteriorated due to light irradiation

Methodology Applied

Scientific EffectLight absorption by dye: Absorption (EM radiation)

Data Source

PatentUS8466862B2Liquid crystal display device

Publication Date: 2013.06.18 MAGNOLIA PURPLE CORP

AI summary

Provided is a liquid crystal display device, which includes a TFT substrate (230) including: first pixel electrodes (237) which are pixel electrodes at regions corresponding to first filter regions; second pixel electrodes (238) which are pixel electrodes at regions corresponding to second filter regions. The liquid crystal display device has a brightness priority mode, which puts priority on bright screen display, and a response speed priority mode, which puts priority on response of a liquid crystal composition at a time of rewriting of a screen. In the response speed priority mode, a voltage to be applied to the second pixel electrode (238) differs from that in the brightness priority mode. With this, it is possible to realize high transmittance and low power consumption while responding to display of images requiring high response speed.