Liquid crystal displays (LCDs) have been widely used in various areas due to their excellent features, i.e. their lightness, high resolution, low power consumption, etc. There are several popular modes for LCDs, such as the twisted nematic(TN) mode, the vertical alignment (VA) mode, and the in-plane...
Liquid crystal displays (LCDs) have been widely used in various areas due to their excellent features, i.e. their lightness, high resolution, low power consumption, etc. There are several popular modes for LCDs, such as the twisted nematic(TN) mode, the vertical alignment (VA) mode, and the in-plane switching(IPS) mode. Amongst these modes, the VA mode displays a superior dark state, through which a high contrast ratio can be realized due to the fact that the liquid crystals (LC) molecules are aligned perpendicularly to the substrates in their initial state. However, LCs in a single domain VA mode tilt down in only one direction in the presence of an applied voltage, resulting in asymmetric viewing angle characteristics. The multi-domain vertical alignment mode has been proposed in order to overcome this problem, however, the multi-domain vertical alignment mode mode still suffers from off-axis color-shifts.
In order to decrease the color-shift, various approaches have been presented. However, additional thin film transistors and data lines are required, resulting in a complex manufacturing process which leads to high costs. In order to simplify the manufacturing process, an 8-domain PVA mode driven by a single transistor has been proposed, which can be fabricated by introducing two different pretilt angles within a pixel. Although the manufacturing process is easier, the contrast ratio may suffer because of the inherently high pretilt angles.
In this paper, we propose formation methods of multi-domain by using different threshold voltage without complex manufacturing process and decreasing contrast ratio in the VA mode. First, we can obtain different threshold voltage by design of electrode structure. By using 3-terminal electrode structure, we can propose the two methods which are structure of grounded top electrode and structure of grounded bottom electrode. In these ways, distribution of vertical field is different in the each sub-pixel, so that we can realize the different threshold voltage. Second, as RM is cured by different curing condition in the each sub-pixel, we obtain different threshold voltage. The controlled conditions are intensity of UV and induced temperature.
We expect that the proposed methods can contribute to the realization of high quality LCDs.
Liquid crystal displays (LCDs) have been widely used in various areas due to their excellent features, i.e. their lightness, high resolution, low power consumption, etc. There are several popular modes for LCDs, such as the twisted nematic(TN) mode, the vertical alignment (VA) mode, and the in-plane switching(IPS) mode. Amongst these modes, the VA mode displays a superior dark state, through which a high contrast ratio can be realized due to the fact that the liquid crystals (LC) molecules are aligned perpendicularly to the substrates in their initial state. However, LCs in a single domain VA mode tilt down in only one direction in the presence of an applied voltage, resulting in asymmetric viewing angle characteristics. The multi-domain vertical alignment mode has been proposed in order to overcome this problem, however, the multi-domain vertical alignment mode mode still suffers from off-axis color-shifts.
In order to decrease the color-shift, various approaches have been presented. However, additional thin film transistors and data lines are required, resulting in a complex manufacturing process which leads to high costs. In order to simplify the manufacturing process, an 8-domain PVA mode driven by a single transistor has been proposed, which can be fabricated by introducing two different pretilt angles within a pixel. Although the manufacturing process is easier, the contrast ratio may suffer because of the inherently high pretilt angles.
In this paper, we propose formation methods of multi-domain by using different threshold voltage without complex manufacturing process and decreasing contrast ratio in the VA mode. First, we can obtain different threshold voltage by design of electrode structure. By using 3-terminal electrode structure, we can propose the two methods which are structure of grounded top electrode and structure of grounded bottom electrode. In these ways, distribution of vertical field is different in the each sub-pixel, so that we can realize the different threshold voltage. Second, as RM is cured by different curing condition in the each sub-pixel, we obtain different threshold voltage. The controlled conditions are intensity of UV and induced temperature.
We expect that the proposed methods can contribute to the realization of high quality LCDs.
Keyword
#디스플레이 소자 Liquid crystal display LCD VA모드 color-shift 3-전극 구조
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