Varintelligent (bvi) Limited

Varitronix Limited

York Liao

Hoi Sing Kwok

Colin T Yeoh

Yiu S Chan

Ying M Poon

Goon N Lee

Michael Y Chan

The present invention deals with liquid crystal displays where the incident light and reflected light going through the display are not specularly related. The incident light can be at a range of angles to the display while the reflected light, i.e. the viewing direction is at or nearly normal to the display. For such nonspecular liquid crystal displays, the polarizer angles, the input/output directors of the liquid crystal cell, and the liquid crystal cell retardation have to be specially optimized to obtain the best viewing effects. Conventional liquid crystal display modes do not work optimally in this nonspecular situation. We also disclose the new image-mode and shadow-mode nonspecular liquid crystal displays. Such displays have very bright background and are free from viewing glare common in most liquid crystal displays. The present invention applies to all twist angles, e.g. the 90&deg; TN, the 120&deg; and 150&deg; HTN, the 180&deg;, 240&deg; and 270&deg; STN displays.

Liquid crystal display with nonspecular reflectors

The invention relates to an active matrix liquid crystal display device based on voltage control (non-zero driving voltage) of the birefringence (negative or positive) of the liquid crystal cell. In the device a ground (earth) plate comprises a piece of glass with a transparent conductive coating, such as indium tin oxide. A silicon wafer with integrated circuits on it has a coating of polymer for aligning liquid crystal molecules. The coated glass also has a coating for aligning the liquid crystal molecules.

Electro-Optic display providing a grey scale by utilizing voltage

A touch sensitive pad consists of a number of electrical conductive pads (10) surrounded by a conductive pad (11). Each pad (10) is connected via a respective capacitive blocking filter to a multiplexer (13) and an oscillator (14). When the touch pad is touched directly to effectively bridge between one of the pads (10) and the surrounding pad (11), a change in effective impedance is detected by a resultant variation in the frequency of the oscillator (14).

Conductive touch pad with capacitive blocking filter

A contact sensitive substrate for electronic equipment comprising a plurality of touch pads and respective associated leads defining an array of touch positions on a front (in use) face of the substrate.

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Hong Kong, China

York Liao