DBS Electrode Voltage Synchronization for LCD Light Transmittance

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Solution Overview

Problem

Conventional liquid crystal display panels experience low light transmittance due to the offset black matrix in curved panels, causing light leakage and color shifts, which is exacerbated by the DBS technology affecting rotation angles of liquid crystals near DBS electrodes.

Innovation Solution

Applying a voltage equal to the pixel voltage to DBS electrodes at a gray scale of 255 ensures consistent rotation with pixel electrodes, improving brightness and light transmittance by synchronizing the rotation of liquid crystals at DBS and pixel electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If DBS technology is used to replace black matrix for light shielding, then device complexity is reduced and manufacturing is simplified, but light transmittance deteriorates due to affected rotation angles of liquid crystals near DBS electrodes

Engineering Contradiction:

Improvestructure complexityVSAvoidlight transmittance

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent changes the voltage parameter applied to DBS electrodes during the alignment process. Specifically, it applies a voltage equal to the pixel voltage at gray scale 255 to DBS electrodes, which synchronizes the rotation of liquid crystals at DBS electrodes with pixel electrodes, thereby improving light transmittance while maintaining the simplified DBS structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent performs a preliminary voltage application step during the alignment process before final operation. By applying the appropriate voltage during alignment, the liquid crystal molecules are pre-positioned correctly, ensuring optimal light transmittance from the start of operation

Inventive Principle:

Principle #10Preliminary action

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 enhances the brightness at DBS electrodes, thereby increasing the light transmittance of the liquid crystal display panel, particularly at the 255th gray scale, which is crucial for rich color representation and image detail.

Implementation Method 1

apply a driving voltage on the two substrates to control a rotation direction of the liquid crystal molecules to refract light from a backlight module to produce images

Methodology Applied

Scientific EffectLiquid crystal rotation: Electro-Optic Effects

Implementation Method 2

control a rotation direction of the liquid crystal molecules to refract light from a backlight module to produce images

Methodology Applied

Scientific EffectLight refraction: Refraction

Data Source

PatentUS11789328B2Liquid crystal display panel and alignment method thereof

Publication Date: 2023.10.17 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

The present invention provides a liquid crystal display panel and an alignment method of the liquid crystal display panel. By inputting a voltage equal to a pixel voltage into data black-matrix less (DBS) electrodes at a gray scale 255, rotation of liquid crystals at the DBS electrodes can be consistent with rotation of liquid crystals at the pixel electrodes during an alignment process. Therefore, the present invention improves brightness at the DBS electrodes of the liquid crystal display panel at the gray scale 255, and increases light transmittance of the liquid crystal display panel.