Transflective mode color liquid crystal display
First Claim
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1. A transflective mode color LCD, comprising:
- a transflective mode color LCD panel composed at least of a pair of opposite transparent substrates with a liquid crystal layer sandwiched between them and also provided with a partly transmitive and partly reflective semi-reflective layer;
a backlight source whose main composite components within the visible light region are composed at least of red, green, and blue narrowband light sources, wherein (a) the peak wavelength of said red narrowband light source is within 590˜
750 nm, and the full width half maximum thereof is smaller than 80 nm;
(b) the peak wavelength of said green narrowband light source is within 500˜
560 nm, and the full width half maximum thereof is smaller than 80 nm;
(c) the peak wavelength of said blue narrowband light source is within 400˜
480 nm, and the full width half maximum thereof is smaller than 80 nm; and
a color filter matched with said backlight source, said color filter being disposed between said two transparent substrates and above said semi-reflective layer, said color filter being composed at least of red, green, and blue color pieces, wherein (a) the transmitive spectrum of said red color piece has an average transmittance of at least 80% at the red color wavelength region and an average transmittance of Rr for other visible light wavelengths with Rr>
20%, and said red color piece selectively absorbs said green and blue narrowband light sources so that the transmittances of said red color piece for said green and blue narrowband light sources will not exceed (0.75×
Rr), respectively;
(b) the transmitive spectrum of said green color piece has an average transmittance at least 80% at the green color wavelength region and an average transmittance of Rg for other visible light wavelengths with Rg>
20%, and said green color piece selectively absorbs said red and blue narrowband light sources so that the transmittances of said green color piece for said red and blue narrowband light sources will not exceed (0.75×
Rg), respectively; and
(c) the transmitive spectrum of said blue color piece has an average transmittance at least 80% at the blue color wavelength region and an average transmittance of Rb for other visible light wavelengths with Rb>
20%, and said blue color piece selectively absorbs said green and red narrowband light sources so that the transmittances of said blue color piece for said green and red narrowband light sources will not exceed (0.75×
Rb), respectively.
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Abstract
The present invention discloses a transflective mode color liquid crystal display, whose white backlight source is composed of several narrowband monochromatic light sources. A color filter for displaying colors is designed to match the wavelength of each of the monochromatic light sources so that the color filter can let a monochromatic light source of one color be transmitted, while selectively absorb the wavelengths of the monochromatic light sources of other colors. The present invention can achieve high color saturation at the backlight mode while maintaining high reflectance.
19 Citations
20 Claims
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1. A transflective mode color LCD, comprising:
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a transflective mode color LCD panel composed at least of a pair of opposite transparent substrates with a liquid crystal layer sandwiched between them and also provided with a partly transmitive and partly reflective semi-reflective layer;
a backlight source whose main composite components within the visible light region are composed at least of red, green, and blue narrowband light sources, wherein (a) the peak wavelength of said red narrowband light source is within 590˜
750 nm, and the full width half maximum thereof is smaller than 80 nm;
(b) the peak wavelength of said green narrowband light source is within 500˜
560 nm, and the full width half maximum thereof is smaller than 80 nm;
(c) the peak wavelength of said blue narrowband light source is within 400˜
480 nm, and the full width half maximum thereof is smaller than 80 nm; and
a color filter matched with said backlight source, said color filter being disposed between said two transparent substrates and above said semi-reflective layer, said color filter being composed at least of red, green, and blue color pieces, wherein (a) the transmitive spectrum of said red color piece has an average transmittance of at least 80% at the red color wavelength region and an average transmittance of Rr for other visible light wavelengths with Rr>
20%, and said red color piece selectively absorbs said green and blue narrowband light sources so that the transmittances of said red color piece for said green and blue narrowband light sources will not exceed (0.75×
Rr), respectively;
(b) the transmitive spectrum of said green color piece has an average transmittance at least 80% at the green color wavelength region and an average transmittance of Rg for other visible light wavelengths with Rg>
20%, and said green color piece selectively absorbs said red and blue narrowband light sources so that the transmittances of said green color piece for said red and blue narrowband light sources will not exceed (0.75×
Rg), respectively; and
(c) the transmitive spectrum of said blue color piece has an average transmittance at least 80% at the blue color wavelength region and an average transmittance of Rb for other visible light wavelengths with Rb>
20%, and said blue color piece selectively absorbs said green and red narrowband light sources so that the transmittances of said blue color piece for said green and red narrowband light sources will not exceed (0.75×
Rb), respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeGiantplus Technology Company Limited (TOPPAN Holdings, Inc.)
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Original AssigneeGiantplus Technology Company Limited (TOPPAN Holdings, Inc.)
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InventorsLin, Alex, Chang, Pin
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current349/113
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CPC Class CodesG02F 1/133514 Colour filtersG02F 1/133555 TransflectorsG02F 1/136222 Colour filters incorporated...
