Liquid crystal display device intended, in particular, to form a color image display screen
First Claim
1. A liquid crystal display device intended to form a colour image display screen, of the type including:
- a first substrate which is transparent on a front side situated on the side of the viewer;
a second substrate arranged on a back side facing the first substrate and extending parallel to the latter;
the first substrate being connected to the second substrate in order to delimit between them a cavity in which at least one film of liquid crystal is arranged;
said liquid crystal being able to have at least a first state in which it reflects the light of a range of wavelengths of a predetermined colour and at least a second state in which it is transparent,the surface of each substrate facing the other substrate including means forming electrodes to allow by selective application of a control voltage to said electrodes, the liquid crystal to pass at least from the first state to the second state or conversely,wherein said liquid crystal display includes a filter absorbing at least the visible neighbouring wavelengths of the range of wavelengths of said predetermined colour and the closest to the wavelength 555 nm with the exception of the wavelengths of said predetermined colour and wherein said filter is arranged on the side of the viewer with respect to said film of liquid crystal and wherein said filter is incorporated in said first substrate.
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Accused Products
Abstract
The invention concerns a liquid crystal display device intended, in particular, to form a colour image display screen, of the type including: a first substrate which is transparent on a front side situated on the side of the viewer; and a second substrate arranged on a back side facing the first substrate and extending parallel to the latter. The first substrate is connected to the second substrate in order to delimit between them a cavity in which at least one film of liquid crystal is arranged. The liquid crystal has at least a first state in which it reflects the light of a range of wavelengths of a predetermined colour and at least a second state in which it is transparent. The surface of each substrate facing the other substrate includes electrodes to allow the liquid crystal to pass at least from the first state to the second state or conversely, by selective application of a control voltage to the electrodes. The liquid crystal display includes a filter absorbing at least the visible neighbouring wavelengths of the range of wavelengths of the predetermined colour and the closest to the wavelength 555 nm with the exception of the wavelengths of said predetermined colour. The filter is arranged on the side of the viewer with respect to the film of liquid crystal.
52 Citations
8 Claims
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1. A liquid crystal display device intended to form a colour image display screen, of the type including:
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a first substrate which is transparent on a front side situated on the side of the viewer; a second substrate arranged on a back side facing the first substrate and extending parallel to the latter; the first substrate being connected to the second substrate in order to delimit between them a cavity in which at least one film of liquid crystal is arranged; said liquid crystal being able to have at least a first state in which it reflects the light of a range of wavelengths of a predetermined colour and at least a second state in which it is transparent, the surface of each substrate facing the other substrate including means forming electrodes to allow by selective application of a control voltage to said electrodes, the liquid crystal to pass at least from the first state to the second state or conversely, wherein said liquid crystal display includes a filter absorbing at least the visible neighbouring wavelengths of the range of wavelengths of said predetermined colour and the closest to the wavelength 555 nm with the exception of the wavelengths of said predetermined colour and wherein said filter is arranged on the side of the viewer with respect to said film of liquid crystal and wherein said filter is incorporated in said first substrate. - View Dependent Claims (2, 3, 4)
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5. A liquid crystal display device intended to form a colour image display screen, of the type including:
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a first substrate which is transparent on a front side situated on the side of the viewer; a second substrate arranged on a back side facing the first substrate and extending parallel to the latter; the first substrate being connected to the second substrate in order to delimit between them a cavity in which at least one film of liquid crystal is arranged; said liquid crystal being able to have at least a first state in which it reflects the light of a range of wavelengths of a predetermined colour and at least a second state in which it is transparent, the surface of each substrate facing the other substrate including means forming electrodes to allow by selective application of a control voltage to said electrode, the liquid crystal to pass at least from the first state to the second state or conversely, wherein said liquid crystal display includes a filter absorbing at least the visible neighbouring wavelengths of the range of wavelengths of said predetermined colour and the closest to the wavelength 555 nm with the exception of the wavelengths of said predetermined colour and wherein said filter is arranged on the side of the viewer with respect to said film of liquid crystal, wherein said display device includes several juxtaposed liquid crystals each reflecting a range of wavelengths of a predetermined colour and wherein said filter is associated with at least one of the liquid crystals. - View Dependent Claims (6, 7, 8)
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Specification