Abstract
Polymer network in vertical alignment liquid crystal cell driven by in-plane field (VA-IPS) is formed in three dimensions to achieve fast response time and to keep the liquid crystal alignment even when an external pressure is applied to the cell. The network formed by UV irradiation to vertically aligned liquid crystal cell with reactive mesogen does not disturb a dark state while exhibiting very fast decaying response time less than 2ms in all grey scales and almost zero pooling mura. The proposed device has a strong potential to be applicable to field sequential display owing to super-fast response time and flexible display owing to polymer network in bulk which supports a gap between two substrates.
Highlights
Nowadays, performance of image quality of the liquid crystal display (LCD) is rapidly improving by applying the advanced LC modes such as in-plane switching (IPS) [1, 2], fringe field switching (FFS) [3, 4], and multi-domain vertical alignment (MVA) including polymer stabilization at surface [5,6,7]
Polymer network in vertical alignment liquid crystal cell driven by in-plane field (VA-IPS) is formed in three dimensions to achieve fast response time and to keep the liquid crystal alignment even when an external pressure is applied to the cell
The network formed by UV irradiation to vertically aligned liquid crystal cell with reactive mesogen does not disturb a dark state while exhibiting very fast decaying response time less than 2ms in all grey scales and almost zero pooling mura
Summary
Performance of image quality of the liquid crystal display (LCD) is rapidly improving by applying the advanced LC modes such as in-plane switching (IPS) [1, 2], fringe field switching (FFS) [3, 4], and multi-domain vertical alignment (MVA) including polymer stabilization at surface [5,6,7]. Plastic film is used in LCDs, applying external pressure to the display or bending the display would deteriorate the displayed image quality because of distortion of cell gap and uniform LC orientation associated with the fluidity of LCs. In addition, high speed LCD modes such as blue phase LCD [16, 17] which provide several μs or less than few ms response time in all grey levels, have to be developed for displaying perfect moving images, and three-dimensional and field sequential color LCDs. In LCD-televisions, LCDs with MVA type is still popular because of rubbing-free process and high contrast ratio at normal direction and recently surface polymer-stabilization by adding small amount of RM less than 1 wt% into LC is performed to improve rising response time of the device [18,19,20]. We investigated the electro-optic characteristics of the VA-IPS cell with polymer network created in the LC bulk This device shows no pooling mura under an external mechanical pressure while showing faster decay response time due to the polymer network
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