Transflective liquid crystal display with enhanced contrast ratio

A back lighted transflective liquid crystal display with improved contrast ratio has a light mask positioned between the transflective element and the source of back lighting. The mask has light transmitting sections which are aligned with and have the same configuration as the indicia-forming elect...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	COLLINS, ROBERT P, ROWEN, JOHN A, HAIM, ELIAS S
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A back lighted transflective liquid crystal display with improved contrast ratio has a light mask positioned between the transflective element and the source of back lighting. The mask has light transmitting sections which are aligned with and have the same configuration as the indicia-forming electrodes in the cell. The mask has opaque or light blocking sections that are aligned with the background portion of the cell. In the transmissive mode light impinges on the cell only in the area of the indicia-forming electrodes, thereby enhancing the contrast ratio between the indicia and background portions of the cell.