Transparent or reflective liquid crystal display assembly with electrochromic and cholesteric layer

• Main Authors: SWIRBEL; THOMAS J, SUPPELSA; ANTHONY J, SHAW; MICHAEL F
• Format: Patent
• Language: English
• Published: 15.09.1998
• Edition: 6
• Subjects: 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

A liquid crystal display assembly (10) can function in either a transparent or reflective mode. The assembly consists of a reflective-type liquid crystal display cell (12) placed in front of an electrochromic panel (14). When a display driver (16) activates the electrochromic panel, it absorbs light. When the driver energizes segments (15) of the reflective-type liquid crystal display cell, they become reflective, providing a visual image to an observer. When the electrochromic panel is not activated by the driver, it is transparent or translucent, allowing the observer to see completely through the liquid crystal display assembly.