Color Liquid Crystal Display Apparatus

• US 20080100551A1
• Filed: 09/29/2005
• Published: 05/01/2008
• Est. Priority Date: 10/20/2004
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakatsue, Takehiro, Kakinuma, Koichiro, Haga, Shuichi, Matsumoto, Tatsuhiko
• Application Number:
  US11/665,878
• Publication Number:
  US 20080100551A1
• Time in Patent Office: Days
• US Class Current: 345/88
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: G02B 5/223 containing organic substances, e.g. dyes, inks or pigments
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133624 characterised by their spectral emissions
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

Disclosed is a color liquid crystal display (LCD) apparatus employing a transmissive color liquid crystal display panel. The apparatus includes, as a light source, a main white light source (21) having a three wavelength phosphorescent lamp emitting light with three or more wavelengths, and an auxiliary light source (22) having at least one of a red light emitting diode (22R), a green light emitting diode (22G) and a blue light emitting diode (22B). The red light emitting diode emits red light with a peak wavelength λpr=645 nm, the green light emitting diode emits green light with a peak wavelength λpg=555 nm and the blue light emitting diode emits blue light with a peak wavelength λpb=440 nm. The light sources act for completely covering the color reproducing range of the sRGB standard and further enlarging respective color ranges.

Claims

1. A color liquid crystal display apparatus including a transmissive color liquid crystal display panel, having a color filter made up of three prime color filters for wavelength selecting and transmitting red light, green light and blue light, and a backlight device for illuminating said color liquid crystal display panel with white light from a backside thereof, wherein said backlight device includes

a main white light source having a three wavelength phosphorescent lamp emitting light with three or more wavelengths, and an auxiliary light source having at least one of a red light emitting diode, a green light emitting diode and a blue light emitting diode, said red light emitting diode emitting red light with a peak wavelength λ

pr=645 nm, said green light emitting diode emitting green light with a peak wavelength λ

pg=555 nm and said blue light emitting diode emitting blue light with a peak wavelength λ

pb=440 nm; and

color mixing means for mixing the light emitted from said light sources to generate said white light;

said color filter including a red color filter having a peak wavelength of a transmission wavelength range Fpr such that 685 nm≦

Fpr≦

690 nm, and having a zero transmittance for light included in a transmission wavelength range of a blue filter, a green filter having a peak wavelength of a transmission wavelength range Fpg equal to 530 nm and having a half-value width Fhwg of said transmission wavelength range such that 90 nm≦

Fhwg≦

100 nm as a result of decreasing the transmittance of said green filter for light included in the transmission wavelength range of said blue filter, and said blue filter having a peak wavelength of a transmission wavelength Fpb such that 440 nm≦

Fpb≦

460 nm.

3. The color liquid crystal display apparatus according to claim 1 wherein the intensity of light emitted by said auxiliary light source is approximately 20% of the intensity of light emitted by said main white light source.

2. (canceled)