MVA LCD Control Capacitance for Viewing Angle and Brightness
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Solution Overview
Problem
Conventional MVA type liquid crystal display devices suffer from a whitish appearance and reduced color reproducibility when viewed from oblique directions due to poor brightness and aperture ratio, primarily caused by the formation of different alignment areas within a pixel leading to uneven voltage distribution across sub-pixels.
Innovation Solution
A liquid crystal display device with a capacitive coupling HT method, where the pixel area is divided into sub-pixels with control capacitance electrodes and alignment regulating structures, allowing for differential voltage application to each sub-pixel, thereby improving the viewing angle characteristics and brightness by dispersing the T-V characteristic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel area is divided into sub-pixels with different alignment areas, then the viewing angle characteristic is improved, but the brightness and aperture ratio deteriorate causing whitish appearance
Solution Approach 1:
The patent applies local quality by providing different control capacitance values to different sub-pixels within the same pixel area. Each sub-pixel receives a customized control capacitance (first control capacitance for first sub-pixels, second control capacitance for second sub-pixels) to optimize their individual performance, thereby maintaining high brightness and aperture ratio while achieving wide viewing angle characteristics through localized optimization rather than uniform treatment.
Solution Approach 2:
The patent segments the pixel area into multiple sub-pixels (first sub-pixels and second sub-pixels) with different alignment characteristics. By dividing the pixel into these segments and applying different control capacitances to each segment, the system can independently optimize the voltage distribution across different alignment areas, resolving the contradiction between viewing angle performance and brightness maintenance.
2Adaptability or versatility
If different alignment areas are formed within a pixel, then the viewing angle characteristic is improved, but the color reproducibility deteriorates
Solution Approach 1:
The patent implements local quality by assigning different control capacitances to different sub-pixels based on their specific alignment characteristics. This localized customization ensures that each sub-pixel operates at its optimal voltage level, thereby maintaining accurate color reproduction across all alignment areas while still benefiting from the wide viewing angle properties of the multi-domain structure.
3Manufacturing precision
If control capacitance is added to each sub-pixel, then the voltage distribution is improved, but the device complexity increases
Solution Approach 1:
The patent merges the control capacitance function with the existing pixel electrode structure. The control capacitance is formed by utilizing the pixel electrode and its connection to the source electrode, rather than adding completely separate control capacitance components. This merging approach allows the control capacitance to be integrated into the existing circuit architecture, thereby improving voltage distribution uniformity across sub-pixels while minimizing the increase in device complexity.
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
The solution enhances the display quality by reducing the whitish appearance and improving color reproducibility, achieving higher brightness and a wider viewing angle with improved aperture ratio and light transmissivity.
Implementation Method 1
a control capacitance section to capacity couple the source electrode and the second pixel electrode
Implementation Method 2
in a state where a voltage is not applied between the pixel electrode and the common electrode, almost all liquid crystal molecules are aligned almost perpendicularly to the substrate surface
Implementation Method 3
When a specified voltage is applied between the pixel electrode and the common electrode, the liquid crystal molecules are inclined with respect to the substrate surface by the influence of an electric field
Implementation Method 4
A bank-shaped linear projection as an alignment regulating structure to regulate the alignment of the liquid crystal is formed on a pixel electrode
Data Source
AI summary
There is provided an MVA type liquid crystal display device having high brightness and excellent display quality. The liquid crystal display device includes a pair of substrates disposed to be opposite to each other, a liquid crystal sealed between the pair of substrates, plural pixel areas each including a pixel electrode 16a formed on one of the substrates and a pixel electrode 16b separated from the pixel electrode 16a, a TFT 20 disposed in each of the pixel areas and including a source electrode 22 electrically connected to the pixel electrode 16a, a linear projection 42 formed on the other substrate and to regulate alignment of the liquid crystal, and a control capacitance section to capacity couple the source electrode 22 and the pixel electrode 16b and including a control capacitance electrode 33 which is electrically connected to the source electrode 22, is opposite to at least part of the pixel electrode 16b through an insulating film, and at least part of which is disposed to overlap with the linear projection 42 when viewed perpendicularly to a substrate surface and extends along the linear projection 42.