Transflective display having improved contrast
First Claim
1. A transflective liquid crystal display device comprising:
- a front substrate, a liquid crystal layer, a transflector, a rear substrate, rear polarizing means, and a backlight, sandwiched in said order, wherein the front substrate and rear substrate form a liquid crystal cell having the liquid crystal layer therebetween;
said backlight being operative to emit light towards said transflector;
said transflector being transmissive for a first part of said light and non-transmissive for a second part of said light; and
said rear polarizing means being operative to transmit light having a first polarization and to reflect light having a second polarization, opposite to said first polarization;
wherein said display device further comprising reflection preventing means arranged between said transflector and said rear polarizing means, and arranged between the front substrate and the rear substrate within the liquid crystal cell;
said reflection preventing means being operative to prevent said second part of light from propagating back towards said rear polarizing means.
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Accused Products
Abstract
The present invention provides for improved contrast in the transmissive mode of a transflective liquid crystal display having a rear stack polarizing means (302) which is transmissive for light having a desired polarization and reflective for light having an opposite, undesired polarization. The contrast is improved due to enhancements of the black state provided by the inclusion of a reflection preventing means (306). The reflection preventing means is arranged between the transflector (301) and the rear stack polarizer (302), and serves to stop light transmitted through the rear stack polarizer (302) towards the transflector (301) from being reflected by the transflector (301) back to the rear polarizer (302). Thereby undesired reflections having wrong polarization are stopped from being transmitted through the transflector (301) and thus from affecting the transmissive mode black state of the display.
28 Citations
20 Claims
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1. A transflective liquid crystal display device comprising:
- a front substrate, a liquid crystal layer, a transflector, a rear substrate, rear polarizing means, and a backlight, sandwiched in said order, wherein the front substrate and rear substrate form a liquid crystal cell having the liquid crystal layer therebetween;
said backlight being operative to emit light towards said transflector;
said transflector being transmissive for a first part of said light and non-transmissive for a second part of said light; and
said rear polarizing means being operative to transmit light having a first polarization and to reflect light having a second polarization, opposite to said first polarization;
wherein said display device further comprising reflection preventing means arranged between said transflector and said rear polarizing means, and arranged between the front substrate and the rear substrate within the liquid crystal cell;
said reflection preventing means being operative to prevent said second part of light from propagating back towards said rear polarizing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- a front substrate, a liquid crystal layer, a transflector, a rear substrate, rear polarizing means, and a backlight, sandwiched in said order, wherein the front substrate and rear substrate form a liquid crystal cell having the liquid crystal layer therebetween;
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9. A transflective liquid crystal display device comprising:
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a front substrate; a liquid crystal layer, a transflector, a reflection preventing layer, a rear substrate, a rear polarizer, and a backlight, sandwiched in said order on a same side of the liquid crystal layer, wherein the front substrate and rear substrate form a liquid crystal cell having the liquid crystal layer therebetween; wherein said backlight being operative to emit light towards said transflector, said transflector being transmissive to a first part of said light and non-transmissive to a second part of said light, and wherein the reflection preventing layer being operative to prevent said second part of light from propagating back towards said rear polarizing means, and wherein the reflection preventing layer is arranged between the front and rear substrates within the liquid crystal cell. - View Dependent Claims (20)
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Specification