一种利用反射电极偏压的半反半透LCD

介绍了一种VA模式反射电极偏压的常黑单盒厚半反半透LCD.在透射区,形成连续且均匀的贯穿液晶层的电场;而在反射区,电场则主要由电极表面形状控制.由此,可使透射区的位相延迟约是反射区的2倍.这样一种半反半透LCD不论透射区还是反射区都有很高的光透过率(＞90%),同时二者灰阶特性重合度也很好.     

一种利用反射电极偏压的半反半透LCD

介绍了一种VA模式反射电极偏压的常黑单盒厚半反半透LCD。在透射区,形成连续且均匀的贯穿液晶层的电场;而在反射区,电场则主要由电极表面形状控制。由此,可使透射区的位相延迟约是反射区的2倍。这样一种半反半透LCD不论透射区还是反射区都有很高的光透过率(>90%),同时二者灰阶特性重合度也很好。     

一种利用反射电极偏压的半反半透LCD

介绍了一种VA模式反射电极偏压的常黑单盒厚半反半透LCD.在透射区,形成连续且均匀的贯穿液晶层的电场;而在反射区,电场则主要由电极表面形状控制.由此,可使透射区的位相延迟约是反射区的2倍.这样一种半反半透LCD不论透射区还是反射区都有很高的光透过率(＞90%),同时二者灰阶特性重合度也很好.     

Ultrawide-view liquid crystal displays

The wide viewing angle technologies for liquid crystal displays (LCDs) are reviewed. The most promising liquid crystal modes for wide view technologies, such as in-plane switching, multidomain vertical alignment, patterned vertical alignment, and advanced-super-view are compared. By optimizing the phase-compensation films and their device configurations, the ultrawide-view LCDs with a contrast ratio higher than 100:1 at /spl plusmn/85/spl deg/ viewing cone are demonstrated.     

Fluorescent liquid crystal displays

Liquid crystal displays (LCDs) are commonly found in portable equipment. The main criticisms aimed at these displays are their asymmetric angle of view and dull grey appearance, which is particularly acute in low ambient lighting. It has been demonstrated that by the inclusion of a fluorescent dye it is possible to fabricate emissive LCDs with virtually a hemispherical angle of view.     

Nematic liquid crystal materials for displays

Nematic liquid crystals are being used in a variety of display devices that capitalize on unique characteristics of these organic fluids. This paper discusses the purification and preparation of nematic liquid crystals, their operating temperature ranges, and the extent to which their properties meet the requirements of current dynamic-scattering and field-effect displays. While device performance can be further improved by tailoring the material, product acceptance will be principally determined by other factors such as reliability, packaging, and price reduction.     

Microwave holograms using liquid crystal displays

The use and limitations of liquid crystals for photographically recording microwave holograms are discussed.     

Micro-optics for liquid crystal displays applications

Micro-optics have become the key technology in liquid crystal display systems due to its capabilities of miniaturization and design flexibility. Design consideration and experimental results of microoptical components for enhancing the image quality, providing better functions, increasing light efficiency, and generating 3D images in liquid crystal display (LCD) applications are presented.     

Contrast optimization in matrix-addressed liquid crystal displays

In a fast-scan mode of addressing a matrix of m rows and n columns, in which the columns are scanned, contrast is optimized by maximizing the ratio of the rms voltage at a selected intersection to that at a nonselected one. A simple derivation shows that the address-pulse amplitude should be taken proportional to n^1/2. We apply this result to the twisted nematic case.     

High transmittance in-plane switching liquid crystal displays

We have developed a high-transmittance in-plane switching (HT-IPS) liquid crystal display (LCD) using special electrode design on the same substrate. The featured electrode configuration generates substantial horizontal electric fields between the electrode groups, and fringe fields with rich horizontal components within the regions of electrode groups. The former is similar to the IPS mode and the latter is similar to the fringe-field switching (FFS) mode. The HT-IPS mode exhibits a high transmittance (> 90 % of twisted nematic (TN) mode), as well as wide viewing angle for cells using both positive and negative dielectric anisotropy LC materials. In addition, we also compare the electro-optical performance of the HT-IPS with IPS and FFS cells under the same conditions.     

Analytical solutions for uniaxial-film-compensated wide-view liquid crystal displays

The uniaxial-film-compensated wide-view liquid crystal displays, with initially homogeneous alignment and vertical alignment, are analyzed. For each compensation scheme, the analytical solutions with the illustration of Poincare sphere representation are derived. Based on the analytical solutions, the 100:1 iso-contrast contours at any viewing angle can be easily achieved for most of the compensation schemes.     

Sparse orthogonal matrices for scanning liquid crystal displays

A multi-line addressing technique that is based on sparse orthogonal matrices is proposed to drive the liquid crystal displays (LCDs). Hardware in the column drivers is utilized fully and yet the hardware complexity of the controller is reduced by using sparse matrices to scan the passive matrix LCDs.     

Dependency of spectral reflectance on rotating direction of liquid crystal for reflective liquid crystal displays

Unlike transmissive liquid crystal display (LCD), spectral reflectance of reflective LCD along normal direction was observed to be different for left and right rotation of LC molecules or different domains. Characteristics of spectral reflectance distribution were analyzed. This dependence of spectral reflectance can be used to modify spectral reflectance distribution of reflective LCD at nonzero gray levels.     

Bending angle effects on the multi-domain in-plane-switching liquid crystal displays

The electro-optic properties of a multi-domain in-plane switching liquid crystal display (IPS LCD) are investigated through a three-dimensional (3-D) simulator, which combines the finite element and finite difference methods for fast solutions. The bending angle between the chevron-shaped electrodes makes an important contribution to the operating voltage and response time, and suppresses the color shift. Using optimized uniaxial compensation films, the viewing cone of the multi-domain IPS LCD is widened to /spl plusmn/80/spl deg/ at 100:1 contrast ratio. These properties are especially desirable for LCD TV and computer monitor applications.     

Reflective direct-view displays using a dye-doped dual-frequency liquid crystal gel

A high-contrast, fast-response, and polarizer-free reflective display using a dye-doped dual-frequency liquid crystal gel is demonstrated. The high contrast ratio originates from the combination of light scattering from the microdomain polymer gel and absorption from the black dyes. The fast response is due to the frequency modulation of the dual-frequency liquid crystal.     

Analytic solution of film compensated bistable twisted nematic liquid crystal displays

In this paper, we studied the optics of transmissive bistable nematic liquid crystal displays by using the Poincare sphere approach. We derived analytical solutions of the polarization state of the outcoming light for the two bistable states. We have found the optimum modes of film compensated bistable twisted nematic liquid crystal displays. Our results show that the number of optimized modes at a fixed wavelength of film-compensated bistable twisted nematic (BTN) is infinite. We identified the optimized modes for displays operated in the whole visible light wavelength region. We calculated the transmission spectra of the two bistable states of the optimized modes.     

A controller for liquid crystal displays in logic analyzers and oscilloscopes

Design and development of a controller to display multiple waveforms using liquid crystal displays (LCDs) is presented. The controller generates the column signals directly from samples of the waveforms. A low cost passive matrix display with simple drive electronics for Logic Analyzers and Oscilloscopes is demonstrated.     

Wideviewing technologies of liquid crystal displays based on dielectric surface patterns

The spontaneous formation of self-aligned multidomains is used for fabricating wideviewing liquid crystal displays (LCDs) based on dielectric surface patterns (DSPs). The periodic DSPs can be produced on substrates through either the curing of photopolymers or the replica molding of dielectric polymers. Due to the symmetric multidomain structure associated with the initial liquid crystal (LC) director distribution, the LC cells with the periodic DSPs are found to show high contrast and wideviewing characteristics.