Abstract
We proposed a patterned vertical alignment (PVA) mode controlled by a modified surface with ultraviolet (UV) curable reactive mesogen (RM) mixed with vertical alignment material for a liquid crystal display (LCD) with fast response time. In the surface-controlled PVA (SC-PVA) mode, the RM monomers in the alignment layer are polymerized along the LC directors by UV exposure under an applied voltage. The polymerized RMs produce a pretilt against the substrate normal depending on the applied field direction in the patterned electrode configuration. In such SC-PVA mode, fast response time was achieved at whole grey levels with the predetermined rotational preference of the LC directors governed by the pretilt direction.
Highlights
The demand for the large-sized flat panel displays has been increased by the expansion of the digital television (TV) market
We proposed a patterned vertical alignment (PVA) mode controlled by a modified surface with ultraviolet (UV) curable reactive mesogen (RM) mixed with vertical alignment material for a liquid crystal display (LCD) with fast response time
In the surface-controlled PVA (SCPVA) mode, the RM monomers in the alignment layer are polymerized along the LC directors by UV exposure under an applied voltage
Summary
The demand for the large-sized flat panel displays has been increased by the expansion of the digital television (TV) market. The PVA mode, where the LCs are vertically aligned in alternatively patterned pixel and common electrodes, is one of the most promising LC modes for the large-sized display applications due to fast decay time, rubbing-free fabrication process, high contrast ratio at a normal direction, and wide viewing characteristics in the multidomain structure. In order to improve the slow response time in the PVA mode, the overdriving technologies, so called dynamic capacitance compensation (DCC I [7,8] and DCC II [9]), were proposed In these cases, the driving schemes were complicated and additional processes were required, which increase the manufacturing costs. The RM monomers do not give rise to any severe degradation of the image quality since they are confined in the alignment layer
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