Color liquid crystal display

A technology of liquid crystal display devices and liquid crystal display panels, which can be applied to lighting devices, static indicators, lighting and heating equipment, etc., and can solve problems such as poor color purity

Inactive Publication Date: 2007-09-19
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, there is a problem that color purity is not so good when the color reproduced by a backlight device using such a three-wavelength region emission type CCFL as a light source and a color liquid crystal display panel equipped with the above-mentioned color filter is not good.
[0016] In addition, as shown in FIG. 2, the color reproduction range of a color liquid crystal display device equipped with a backlight device using CCFL as a light source is narrower than the color reproduction range stipulated in the NTSC system standard adopted as a color television broadcasting system. (NTSC ratio: 74%), there is a problem that it cannot be said that it can fully correspond to the current TV broadcasting

Method used

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Examples

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Embodiment 1

[0069] In Embodiment 1, the main white light source 21 is assisted by appropriately selecting the peak wavelengths of the red light emitting diode 22R, the green light emitting diode 22G and the blue light emitting diode 22B constituting the auxiliary light source 22, so that the color reproduction range of the color liquid crystal display device 100 is Fully covers the sRGB range, and thus becomes a wide color gamut.

[0070] FIG. 11 shows spectral characteristics of a CCFL 21F used as the main white light source 21 of the backlight 20 . As can also be seen from FIG. 11 , the CCFL 21F used as the main white light source 21 has the same spectral characteristic as that shown in FIG. 1 , which is the characteristic of a standard CCFL. In addition, for convenience of description, it is assumed that the spectral characteristics of the CCFL 21F shown in FIG. 11 are equivalent to the spectral characteristics of the main white light source 21 .

[0071] As shown in FIG. 11 , the bri...

Embodiment 2

[0090] In the above-mentioned embodiment 1, in order to completely cover sRGB and achieve a further expansion of the color gamut, a red light emitting diode 22R, a green light emitting diode 22G, and a blue light emitting diode 22B are used to improve the spectral characteristics of the bright line spectrum of the main white light source 21. The auxiliary light source 22 is composed.

[0091] In the second embodiment, the degree of freedom of coloring is increased by further expanding the red (R) region, the green (G) region, and the blue (B) region enlarged by the auxiliary light source 22 in the first embodiment. As a main factor preventing the expansion of the color gamut, for example, a decrease in color purity due to the influence of the sub-peak peculiar to CCFL on the adjacent color filter 19 is considered.

[0092] Therefore, by pursuing the characteristics of the red filter CFR, green filter CFG, and blue filter CFB provided in the color liquid crystal display panel 1...

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Abstract

A color liquid crystal display (LCD) using a transmissive color liquid crystal display panel is provided with a main white light source (21) composed of a three-wavelength fluorescent lamp which emits light of three wavelengths or more as a light source; and an auxiliary light source (22) which includes at least one type of a diode among a red color light emitting diode (22R) which emits red color light having a peak wavelength pr of 645nm, a green color light emitting diode (22G) which emits green light having a peak wavelength pg of 555nm, and a blue color light emitting diode (22B) which emits blue color light having a peak wavelength pb of 440nm. Thus, a color reproduction range of sRGB standards is completely covered and each color gamut is expanded.

Description

technical field [0001] The present invention relates to a color liquid crystal display device (LCD), and more particularly to a color liquid crystal display device in which color gamut is enlarged to ensure more faithful color reproducibility. [0002] This application claims priority based on Japanese Patent Application No. 2004-306073 filed on October 20, 2004 in Japan, which is incorporated herein by reference. Background technique [0003] Conventionally, as a standard color space for computer monitors, there is an sRGB standard stipulated by IEC (International Electrotechnical Commission). This standard clearly defines the color measurement parameters of Rec.709, which is recommended by the ITU (International Telecommunication Union Radiocommunication) for the three primary colors of red (R), green (G), and blue (B). A standard for the relationship between RGB signals and colorimetric values. In a display device conforming to the sRGB standard, if the same video signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02F1/1335F21S2/00F21Y101/02G02B5/20F21Y103/00
CPCG02F1/133604G02F1/133609G09G2360/18G02F1/133514G09G3/3413G02B6/0073G02F2001/133624G02F1/133603G02B5/223G02B6/0068G09G2320/0666F21Y2113/02F21Y2113/20G02F1/133624G02F1/1335
Inventor 芳贺秀一柿沼孝一郎中枝武弘松本达彦
Owner SONY CORP
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