Nacreous transflector illumination system for liquid crystal display
First Claim
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1. An electro-optical display device having an arrangement of front and rear light polarizers sandwiching front and rear optically-transmissive plates with a layer of a twisted nematic liquid crystal composition confined therebetween;
- means to impose a voltage between selected portions of said front and rear optically-transmissive plates and an illumination system comprising an internal light source positioned behind the rear optically-transmissive plate of the display and a nacreous transflector layer coated onto the back surface of said rear light polarizer, said nacreous transflector layer comprising a nacreous pigment material effective both to reflect light passing through said display from the front, as well as to transmit light into said display device emitted from the rear internal light source.
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Abstract
An improved illumination system for electro-optical liquid crystal display devices comprising a nacreous transflector element capable of transmission as well as reflection of light so as to accommodate effective display illumination in conjunction with external and/or internal light sources for enhanced display viewability under all ambient lighting conditions.
65 Citations
11 Claims
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1. An electro-optical display device having an arrangement of front and rear light polarizers sandwiching front and rear optically-transmissive plates with a layer of a twisted nematic liquid crystal composition confined therebetween;
- means to impose a voltage between selected portions of said front and rear optically-transmissive plates and an illumination system comprising an internal light source positioned behind the rear optically-transmissive plate of the display and a nacreous transflector layer coated onto the back surface of said rear light polarizer, said nacreous transflector layer comprising a nacreous pigment material effective both to reflect light passing through said display from the front, as well as to transmit light into said display device emitted from the rear internal light source.
- View Dependent Claims (2, 3, 4, 11)
- 5. A transflector element comprising a layer of nacreous pigment material coated onto one surface of a light polarizer.
- 9. A transflector element comprising a layer of nacreous pigment material coated onto one surface of a polyvinyl alcohol-iodide complex light polarizer.
Specification