Liquid Crystal Display Sub-Pixel Voltage Control
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Solution Overview
Problem
Liquid crystal displays in the vertically aligned mode often suffer from degraded side visibility due to horizontal crosstalk defects, which existing technologies have not adequately addressed.
Innovation Solution
The implementation of a liquid crystal display design that includes a first substrate with a gate line and reference electrode, semiconductor, data conductor, passivation film, color filter, and pixel electrode, where the pixel electrode and reference voltage line are composed of the same material and connected through specific contact holes, allowing for differential voltage adjustment between sub-pixels to control liquid crystal molecule tilt angles and improve visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a vertically aligned mode liquid crystal display is used to achieve high contrast ratio and wide reference viewing angle, then the contrast ratio and reference viewing angle are improved, but side visibility is degraded due to horizontal crosstalk defects
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode, second sub-pixel electrode, third sub-pixel electrode, and fourth sub-pixel electrode). Each sub-pixel electrode is independently controlled by separate transistor circuits, allowing differential voltage adjustment to compensate for horizontal crosstalk and improve side visibility while maintaining the vertically aligned mode's high contrast ratio
Solution Approach 2:
Different voltage levels are applied to different sub-pixel electrodes within the same pixel based on their specific positional requirements. The transistor circuits are configured to provide locally optimized voltages to each sub-pixel electrode, creating non-uniform electric fields that counteract the horizontal crosstalk effect in specific regions while preserving the overall high contrast ratio performance
2Ease of manufacture
If the pixel electrode and reference voltage line are composed of the same material and connected through specific contact holes, then manufacturing complexity is reduced, but precise voltage control between sub-pixels requires additional transistor circuits
Solution Approach 1:
The pixel electrode and reference voltage line are formed using the same material layer, eliminating the need for separate material deposition processes and reducing manufacturing complexity. The reference voltage line is connected to the pixel electrode through contact holes that pass through the passivation layer, creating a unified electrical structure that simplifies the fabrication process while maintaining precise voltage control capabilities through the transistor circuits
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 design effectively reduces or prevents horizontal crosstalk defects, enhancing side visibility by ensuring that the voltages applied to sub-pixel electrodes differ, thereby improving image clarity when viewed from lateral angles.
Implementation Method 1
The liquid crystal display generates an electric field in a liquid crystal layer by applying a voltage to the field generating electrodes to determine orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light
Implementation Method 2
The liquid crystal display generates an electric field in a liquid crystal layer by applying a voltage to the field generating electrodes to determine orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light
Implementation Method 3
a vertically aligned mode liquid crystal display, in which liquid crystal molecules are aligned so that long axes thereof are normal or perpendicular to the upper and lower panels when no electric field is applied
Data Source
AI summary
A liquid crystal display includes: a first substrate; a gate line and a reference electrode that are disposed on the first substrate and are spaced apart from each other; a gate insulating film disposed on the gate line and the reference electrode; a semiconductor disposed on the gate insulating film; a data conductor disposed on the semiconductor; a passivation film disposed on the data conductor; a color filter disposed on the passivation film; an overcoat disposed on the color filter; and a pixel electrode and a reference voltage line that are disposed on the overcoat and are spaced apart from each other, wherein the pixel electrode and the reference voltage line may include the same material, and the reference voltage line may be connected to the reference electrode through a reference voltage contact hole disposed in the gate insulating film, the passivation film, the color filter, and the overcoat.