We present an optical device capable of displaying in two distinct viewing modes, i.e., monoview and dual-view modes. The monoview mode has a joint viewing cone and allows only the same image or video content to be displayed. The dual-view mode splits one viewing cone into two so that two different pieces of information can be displayed simultaneously in the left and the right viewing directions from the screen. Each viewing mode can be mutually switched through the modulation of the birefringence of liquid crystals. This proposed device has technical advantages of easy operation, low cost, and versatility of applications.

We propose a polarization switching device using optically compensated pi cell for polarization-glass-type three-dimensional display. This device shows good optical properties such as high transmittance and low cross-talk ratio because of its fast dynamic response characteristics. To improve the brightness and contrast ratio on the right-and left-hand sides, we attach optical retardation films on each side of the polarization glasses instead of attaching the films on the polarization switching panel. From the calculation and experiment, we obtain high contrast ratios, over 200:1, on both sides and a high brightness using only one film on each side. © 2011 American Institute of Physics. ͓doi:10.1063/1.3548863͔The flat-panel display technology has developed very fast in the past decade. Hence, this technology is attaining maturity and the market is approaching saturation. On the contrary, the market for three-dimensional ͑3D͒ display has been rapidly expanding worldwide. Many researchers have made various efforts to develop 3D displays with twodimensional ͑2D͒/3D switching, high brightness, and high resolution.1-9 Among these technologies, the stereoscopic 3D display using 3D glasses has attracted industrial attention because it has neither the loss of spatial resolution nor the 3D moiré effect between pixels and barrier. Moreover, the stereoscopic 3D technology is suitable for realizing 2D/3D switching easily. The glass-type 3D displays are divided into passive retarder type using patterned retarder film 5 and active retarder type using either liquid crystal ͑LC͒ shutter glasses 6,7 or polarization switching ͑PS͒ panels. 8,9 However, active retarder type with LC shutter glasses has poor brightness in the 3D mode because of the slow response time and writing speed of the LC panel and shutter glasses. Moreover, the shutter glass is too heavy and uncomfortable due to the presence of batteries, for an active operation. A 3D display with PS panel ͑3D-PS͒ uses polarization glasses that are lighter and more comfortable than LC shutter glasses, because they do not need batteries for operation. However, it also has drawbacks such as low brightness and 3D cross-talk because of slow response time of the PS panel.8 Moreover, without optical compensation, this device has low and asymmetric contrast ratio ͑CR͒. To overcome these limits, we suggested a 3D-PS using dual-frequency LC and two half-waveplate ͑HWP͒ films.9 However, it still has problems such as decrease in brightness due to the two HWPs, low CR under 200:1, and low cell gap under 3 m. Hence, it is difficult to commercialize this technology.In this letter, we propose a stereoscopic 3D display with a PS panel of high brightness and CR. The PS panel is a pi cell with very fast response time. To obtain high brightness and CR in the left-and right-hand sides simultaneously, we suggest a structure with optical compensation using one film on each side. We have measured the properties of the proposed cell, such as its electro-optical ͑EO͒ and dynamic response characteristic...

We present a polarization-switching device with dual-frequency liquid crystal material for a stereoscopic three-dimensional (3D) display. This device shows good properties, such as low 3D cross talk and high brightness, due to a fast dynamic response time. Without optical compensation, however, this device has an asymmetric contrast ratio on the left- and right-hand sides of 3D glasses, because the viewing principles on both sides are different from each other. To solve this problem, we design an optical structure with two half-wave plate films using the Jones matrix method. As the results of simulation and experiment show, excellent dark states and high brightness are realized over the entire range of visible wavelengths on both sides.

We propose a dual mode liquid crystal display (LCD), which can realize dynamic and memory operating LCD modes in a display panel. Horizontal switching and bistable chiral splay nematic LCD modes are used for the dynamic and memory operations, respectively. As the horizontal switching is applied to the dynamic operation, it is possible to use the same LC texture of splay for realizing dark states of both the dynamic and memory operations. Because, for each operation, pixel division is not required in the proposed dual mode LCD, there is no decrease in aperture ratio and resolution. In order to obtain superior display performance for both operations, a wideband half-wave configuration is employed to the proposed dual mode LCD. Due to the wideband configuration, very low light leakages at the dark state and good dispersion characteristics for the entire visible range are obtained. As a result, the proposed dual mode LCD shows a high contrast ratio of over 100:1 for both the dynamic and memory operations.

This study proposes a reflective dual-mode liquid crystal display (RD-LCD) that can be operated in memory mode or dynamic mode according to the image contents. The proposed RD-LCD needs three states to represent dark and bright states, while a general reflective liquid crystal display has two states. Nevertheless, a compensation structure that can obtain high contrast ratios in both dynamic and memory modes has been optimized. The proposed RD-LCD can be operated without internal backlighting, thus making it a candidate for real green display.