Transflective mode liquid crystal display with phosphor illumina

Details Transflective mode liquid crystal display with phosphor illumina Transflective mode liquid crystal display with phosphor illumina

1991-03-18

1992-09-08

Howell, Janice A.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 71, 359 68, G02F 11335

Patent

active

051463555

ABSTRACT:
A transflective liquid crystal display provides a high quality color image and efficient energy utilization. A layer of liquid cyrstal material is controlled by a transparent electrode matrix. A matrix of (primary color emitting) phosphors is aligned with a matrix of transparent electrodes for controlling the shuttering of the liquid crystal layer. A source of fluorescent energy excites the phosphors. A first dichroic filter and a second dichroic filter are located behind the liquid crystal layer. The first filter reflects untraviolet light and transmits visible light while the second filter transmits ultraviolet light and reflects visible light. The two filters are arrayed so that the phosphors are efficiently energized by the ultraviolet light source while ambient illumination is utilized, the display thereby providing both transmissive and reflective modes of operation. The phosphor matrix is separated from the liquid crystal shutter layer by substantially less than the dot pitch of the phosphor matrix layer to maintain the requisite registration and minimize cross-contamination of colors.

REFERENCES:
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patent: 4793691 (1988-12-01), Enomoto et al.
patent: 4802743 (1989-02-01), Takao et al.
patent: 4822144 (1989-04-01), Vriens
patent: 4882617 (1989-11-01), Vriens

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