TFT Array Pixel Electrode Layout for Wide-View LCD Aperture
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Solution Overview
Problem
Liquid crystal display (LCD) devices with vertically aligned mode face a challenge in widening the viewing angle without decreasing the aperture ratio, as larger cutout portions improve liquid crystal control but reduce the aperture ratio.
Innovation Solution
The implementation of a TFT array panel with storage electrodes and conductors having slant portions that overlap cutout portions on the pixel electrode, along with a common electrode with alternately disposed cutout portions, maintains the aperture ratio while enhancing the viewing angle by controlling liquid crystal molecule orientation through a specific dielectric constant and thickness relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If larger cutout portions are formed on the field generating electrodes to improve liquid crystal control and widen viewing angle, then the viewing angle is improved, but the aperture ratio decreases
Solution Approach 1:
The invention introduces a new spatial dimension by forming storage electrodes and storage conductors in an overlapping configuration with slant portions. This three-dimensional arrangement allows the storage electrodes to extend in multiple directions, creating liquid crystal orientation control in additional dimensions without requiring larger cutout portions on the pixel electrode, thus resolving the contradiction between viewing angle and aperture ratio
Solution Approach 2:
The invention segments the liquid crystal orientation control function into multiple components: cutout portions on the pixel electrode for basic orientation control, and additional slant portions on storage electrodes and storage conductors for enhanced multi-directional control. This segmentation allows each component to contribute to viewing angle without requiring any single component to be excessively large, maintaining aperture ratio while achieving wide viewing angle
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 configuration allows for a wider viewing angle in LCD devices without compromising the aperture ratio, as the slant portions of the storage electrodes and conductors effectively control liquid crystal orientation, improving the display's light transmission efficiency.
Implementation Method 1
a dielectric constant and thickness relationship
Implementation Method 2
A voltage is applied to the field generating electrodes to generate an electric field in the liquid crystal layer to determine the alignment of liquid crystal molecules
Data Source
AI summary
A thin film transistor (TFT) array panel includes: a substrate; gate lines including gate electrodes and storage electrode lines including storage electrodes, the gate lines and the storage electrode lines being formed on the substrate; a gate insulating layer formed on the substrate; a semiconductor layer formed on the gate insulating layer; data lines and drain electrodes formed on the gate insulating layer and the semiconductor layer; storage conductors formed together with the data lines on the gate insulating layer and connected with the drain electrodes; a passivation layer formed on the data lines, the drain electrodes, and the storage conductors; and pixel electrodes formed on the passivation layer, connected with the drain electrodes, and having a plurality of cutout portions, wherein each storage electrode and each storage conductor has slant portions that overlap with the cutout portions and overlap with each other with the gate insulating layer interposed therebetween. The storage electrode and the storage conductor have the slant portions that overlap the cutout portions of the pixel electrode, thereby providing an increased aperture ratio. The horizontal component of the electric field allows the sets of cutout portions of the pixel electrode to control the direction of the liquid crystal molecules compared with conventional LCD device in which the storage electrode and the storage conductor do not have slant portions.