LCD Charge-Sharing Capacitors for Lateral Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) devices, particularly in the vertically aligned (VA) mode, suffer from poor lateral visibility compared to their front side, leading to luminance differences and image distortion at high grayscale levels.
Innovation Solution
The implementation of a liquid crystal display (LCD) design featuring first and second gate lines, a data line, pixel electrodes with sub-pixel electrodes connected through charge-sharing capacitors, and switching devices to manage voltages and improve pixel voltage differences between sub-pixels, allowing for enhanced lateral visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cut portions or protrusions are formed at field-generating electrodes to widen the reference viewing angle, then the reference viewing angle is improved, but lateral visibility deteriorates with luminance differences and image distortion
Solution Approach 1:
The pixel electrode is divided into first and second sub-pixel electrodes with different cut portions. Each sub-pixel electrode has distinct cut patterns that independently control liquid crystal alignment in different regions, enabling separate optimization of front and lateral viewing characteristics through differential voltage application
Solution Approach 2:
Different cut portions are designed for the first and second sub-pixel electrodes to create locally optimized liquid crystal alignment. The first cut portion controls alignment for front viewing while the second cut portion controls alignment for lateral viewing, allowing each region to have tailored optical properties
2Illumination intensity
If a vertically aligned (VA) mode LCD is used to achieve high contrast ratio, then the contrast ratio is improved, but lateral visibility deteriorates
Solution Approach 1:
The pixel electrode is segmented into first and second sub-pixel electrodes that can be independently controlled. This segmentation allows different voltage patterns to be applied to each sub-pixel, enabling optimization of both contrast ratio and lateral visibility simultaneously through coordinated operation of the sub-pixels
Solution Approach 2:
The invention changes the voltage parameters applied to different sub-pixel electrodes. By applying different voltages to the first and second sub-pixel electrodes, the liquid crystal alignment can be optimized for both high contrast ratio in VA mode and improved lateral visibility
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 enhances lateral visibility by ensuring similar gamma curves for both the front and side views of the LCD, reducing luminance differences and improving image clarity at high grayscale levels.
Implementation Method 1
a pixel electrode which is disposed in a pixel and includes first and second sub-pixel electrodes that are connected to each other through a first charge-sharing capacitor
Data Source
AI summary
A liquid crystal display (LCD) is provided that can improve lateral visibility while preventing a decrease in luminance. The LCD includes first and second gate lines which are arranged in parallel with each other and sequentially transmit a gate voltage; a data line which intersects the first and second gate lines and transmits a data voltage; a pixel electrode which is disposed in a pixel and includes first and second sub-pixel electrodes that are connected to each other through a first charge-sharing capacitor; a first switching device which is connected to the first gate line, the data line and the first sub-pixel electrode; a second switching device which is connected to the first sub-pixel electrode through a second charge-sharing capacitor; and a third switching device which is connected to the second gate line and the second sub-pixel electrode and is also connected to the first sub-pixel electrode through the second charge-sharing capacitor.