Color liquid crystal display

一种液晶显示装置、液晶显示板的技术，应用在照明装置、静态指示器、照明和加热设备等方向，能够解决色纯度不太好等问题

Inactive Publication Date: 2012-04-25
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] Additionally, if figure 2 As shown, 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 standard adopted as a color TV broadcasting method (NTSC ratio: 74 %), there is such a problem that it cannot be said that it can fully correspond to the current TV broadcasting

Method used

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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] Figure 11 Spectral characteristics of CCFL 21F used as main white light source 21 of backlight 20 are shown. Depend on Figure 11 It can also be seen that the CCFL21F used as the main white light source 21 is the same as figure 1 The spectral characteristics shown are the same as those of CCFLs that are used as standard. In addition, for the convenience of illustration, it is assumed that Figure 11 The shown spectral characteristics of the CCFL 21F are equivalent to those of the main white light source 21 .

[0071]Such as Figure 11 As shown, th...

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 Patents(China)
IPC IPC(8): G02F1/13357G02F1/1335F21S2/00G02B5/20F21Y103/00F21Y101/02
CPCG02F1/133604G02F1/133609G09G2360/18G02F1/133514G09G3/3413G02B6/0073G02F1/133603G02B6/0068G02B5/223G02F2001/133624G09G2320/0666F21Y2113/02F21Y2113/20G02F1/133624G02F1/1335
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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