Vertical Alignment LCD Variable Capacitor Sub-Pixel Structure
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Solution Overview
Problem
Vertical alignment liquid crystal displays suffer from lower lateral visibility compared to front visibility, leading to issues like increased brightness towards the sides and loss of luminance difference in gray levels, which can result in a collapsed image appearance.
Innovation Solution
The implementation of a pixel structure with high gray and low gray sub-pixels utilizing variable capacitors, where the capacitors have different capacitance values based on the voltage applied, allowing for enhanced lateral visibility without the need for separate signal wires, thereby simplifying the design and increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutouts or protrusions are formed on field-generating electrodes to widen viewing angle, then reference viewing angle is improved, but lateral visibility deteriorates with brightness increase and luminance difference loss
Solution Approach 1:
The pixel is divided into multiple sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel) with different liquid crystal capacitor configurations. Each sub-pixel has distinct capacitance values that enable independent control of luminance levels, allowing the display to maintain gray level differentiation while achieving wide viewing angles without the need for cutouts or protrusions on electrodes.
2Illumination intensity
If variable capacitors with different capacitance values are used in sub-pixels, then lateral visibility and gray level differentiation are improved, but device complexity increases
Solution Approach 1:
The patent utilizes variable capacitors whose capacitance values change based on applied voltage thresholds. The first, second, and third liquid crystal capacitors have different capacitance parameters (C1, C2, C3) that are voltage-dependent, enabling dynamic control of luminance levels in different sub-pixels. This parameter variation allows effective gray level differentiation and improved lateral visibility while maintaining a relatively simple pixel structure without requiring additional complex components.
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 solution enhances lateral visibility by allowing the display to express different grays effectively, reducing the complexity of signal processing and maintaining high aperture ratio, thus improving the overall image quality.
Implementation Method 1
a liquid crystal capacitor and a variable capacitor respectively connected to the output terminal of the thin film transistor
Implementation Method 2
The first and second variable capacitors may have a first capacitance when the voltage applied to the gate electrode reaches or exceeds a predetermined voltage, and they have a second capacitance when the voltage applied to the gate electrode is less than the predetermined voltage
Implementation Method 3
a thin film transistor with control and input terminals connected to the gate and data lines, respectively
Data Source
AI summary
A vertical alignment liquid crystal display includes two sub-pixels each with a variable capacitor. A pixel is bisected into a high gray sub-pixel and a low gray sub-pixel through forming a variable capacitor at each sub-pixel. With this structure, the sub-pixels express different grays so that lateral visibility is enhanced. It is not required in bisecting a pixel into two sub-pixels to form separate wires for applying different signals thereto, and the amount of data to be processed at the driver for driving the display device is reduced. Furthermore, a pixel is bisected into two sub-pixels with variable capacitors in a simplified manner, and it is not required to form additional wires and elements, so the aperture ratio is enhanced.