Abstract
We report a vertically-aligned liquid crystal display (LCD) device with submillisecond response time, high transmittance, and low operation voltage. The top substrate has a common electrode, while the bottom substrate consists of hole-patterned fringing-field-switching (FFS) pixel electrodes. A negative dielectric anisotropy LC is employed. In the voltage-on state, the LC directors are reoriented by the fringing fields surrounding the hole area and by the longitudinal and fringe fields outside the hole area. After design optimization, we are able to achieve 85% peak transmittance under crossed circular polarizers. During the relaxation process, the standing walls exert a strong restoring force, leading to submillisecond gray-to-gray response time. Moreover, this device enables high resolution density because only one thin-film transistor per pixel is needed and the bottom FFS electrode has built-in capacitor. This device is particularly attractive for the emerging virtual reality displays.
Highlights
Virtual reality (VR) is an emerging wearable display which has widespread applications in immersive video games, sports training, and surgery simulation, just to name a few [1, 2]
Unlike computers and TVs which are often placed more than 30 cm away from the viewers, the head-mounted VR display is near to the eye
The resolution of organic light emitting diode (OLED) panel is limited by the employed mask and the relatively low aperture ratio because multiple thin-film transistors (TFTs) are required per pixel for current driving and compensation circuit
Summary
Virtual reality (VR) is an emerging wearable display which has widespread applications in immersive video games, sports training, and surgery simulation, just to name a few [1, 2]. Two critical requirements for VR displays are high resolution and fast response time. Most VR products, such as Oculus Rift and Samsung Gear VR, use organic light emitting diode (OLED) display panels because of their excellent black state, fast response time, and high resolution. Liquid crystal displays (LCDs) which only need one switching TFT per pixel have potential to achieve higher resolution for VR applications. Blue phase LC offers submillisecond response time, but it requires protruded electrodes to achieve 75% transmittance at 15 V. Our device enables a high aperture ratio because only one TFT is needed per pixel while the bottom FFS electrodes have built-in capacitors. This device is attractive for the emerging VR displays
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