Backlight Device and Color Liquid Crystal Display
First Claim
1. A backlight device for illuminating with a white light, a transmissive color liquid crystal display panel from a back side thereof, the transmissive color liquid crystal display panel including a color filter employing three color filters for transmitting red light, green light and blue light by wavelength selection, the backlight device comprising:
- a light source, including a red light emitting diode, radiating red light, having a peak wavelength λ
pr such that 625 nm≦
λ
pr≦
685 nm, a green light emitting diode, radiating green light, having a peak wavelength λ
pg such that 505 nm≦
λ
pg≦
540 nm, and a blue light emitting diode, radiating blue light, having a peak wavelength λ
pb such that 420 nm≦
λ
pb≦
465 nm, and mixing means for color mixing the red light, the green light and the blue light, radiated from the light source, to generate white light;
wherein a light emission intensity of the red light, the green light and the blue light, radiated from the red light emitting diode, the green light emitting diode and the blue light emitting diode, respectively, is adjusted so that a half value width hwr of a spectrum of the red light, a half value width hwg of a spectrum of the green light and a half value width hwb of a spectrum of the blue light are such that 20 nm≦
hwr≦
25 nm, 30 nm≦
hwg≦
40 nm and 25 nm≦
hwb≦
30 nm, respectively.
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Accused Products
Abstract
Disclosed is a backlight device which is used for a color liquid crystal display and includes a light source and a backlight housing (23). The light source includes a red light emitting diode (21R), radiating red light, having a peak wavelength λpr such that 625 nm≦λpr≦685 nm, a green light emitting diode (21G), radiating green light, having a peak wavelength λpg such that 505 nm≦λpg≦540 nm, and a blue light emitting diode (21B), radiating blue light, having a peak wavelength λpb such that 420 nm≦λpb≦465 nm. The backlight housing mixes the red light, the green light and the blue light, radiated from the light source, to generate white light. A light emission intensity is adjusted so that a half value width of a spectrum of the red light, a half value width of a spectrum of the green light and a half value width of a spectrum of the blue light are such that 20 nm≦hwr≦25 nm, 30 nm≦hwg≦40 nm and 25 nm≦hwb≦30 nm, respectively.
50 Citations
10 Claims
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1. A backlight device for illuminating with a white light, a transmissive color liquid crystal display panel from a back side thereof, the transmissive color liquid crystal display panel including a color filter employing three color filters for transmitting red light, green light and blue light by wavelength selection, the backlight device comprising:
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a light source, including a red light emitting diode, radiating red light, having a peak wavelength λ
pr such that 625 nm≦
λ
pr≦
685 nm, a green light emitting diode, radiating green light, having a peak wavelength λ
pg such that 505 nm≦
λ
pg≦
540 nm, and a blue light emitting diode, radiating blue light, having a peak wavelength λ
pb such that 420 nm≦
λ
pb≦
465 nm, and mixing means for color mixing the red light, the green light and the blue light, radiated from the light source, to generate white light;
wherein a light emission intensity of the red light, the green light and the blue light, radiated from the red light emitting diode, the green light emitting diode and the blue light emitting diode, respectively, is adjusted so that a half value width hwr of a spectrum of the red light, a half value width hwg of a spectrum of the green light and a half value width hwb of a spectrum of the blue light are such that 20 nm≦
hwr≦
25 nm, 30 nm≦
hwg≦
40 nm and 25 nm≦
hwb≦
30 nm, respectively. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A color liquid crystal display including a transmissive color liquid crystal display panel having a color filter employing three color filters for transmitting red light, green light and blue light by wavelength selection, and a backlight device for illuminating, with white light, the color liquid crystal display panel from a back side thereof, wherein
the backlight device comprises: - a light source, including a red light emitting diode, radiating red light, having a peak wavelength λ
pr such that 625 nm≦
λ
pr≦
685 nm, a green light emitting diode, radiating green light, having a peak wavelength λ
pg such that 505 nm≦
λ
pg≦
540 nm, and a blue light emitting diode, radiating blue light, having a peak wavelength λ
pb such that 420 nm≦
λ
pb≦
465 nm, and mixing means for color mixing the red light, the green light and the blue light, radiated from the light source, to generate white light; and
a light emission intensity of the red light, the green light and the blue light, radiated from the red light emitting diode, the green light emitting diode and the blue light emitting diode, respectively, is adjusted so that a half value width hwr of a spectrum of the red light, a half value width hwg of a spectrum of the green light and a half value width hwb of a spectrum of the blue light are such that 20 nm≦
hwr≦
25 nm, 30 nm≦
hwg≦
40 nm and 25 nm≦
hwb≦
30 nm, respectively. - View Dependent Claims (7, 8, 9, 10)
- a light source, including a red light emitting diode, radiating red light, having a peak wavelength λ
Specification
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- Resources
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsNakatsue, Takehiro, Kakinuma, Koichiro, Haga, Shuichi, Matsumoto, Tatsuhiko
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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 Current349/68
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CPC Class CodesG02F 1/133603 with LEDsG02F 1/133609 including means for improvi...G09G 2320/0666 for control of colour param...G09G 3/3413 Details of control of colou...
