Color filter and liquid crystal display device
A technology of liquid crystal display device and color filter, which is applied in the directions of instruments, filters, optics, etc., can solve the problems such as the inability to improve white color reproducibility and brightness.
Inactive Publication Date: 2009-03-25
TOYO INK SC HOLD CO LTD +1
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Problems solved by technology
[0017] As described in the above-mentioned Japanese Patent Application Publication No. 2004-177592 and Japanese Patent Application Publication No. 2004-145275, only improving the color reproducibility of green or red filter segments cannot improve the color reproducibility and brightness (Y value) of white. )
Method used
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Embodiment 1～14 and comparative example 1～2
[0178] Examples 1-14 and Comparative Examples 1-2: Fabrication of color filters
[0179] A black matrix pattern was formed on a glass substrate, and the red coloring composition shown in Table 5 below was applied to the substrate with a spinner to form a coating film of the red coloring composition.
[0180] Through a photomask, irradiate 300mJ / cm on the above-mentioned film with an ultra-high pressure mercury lamp 2 of ultraviolet light. Next, the above-mentioned coating was sprayed and developed with an alkaline developer composed of 2% sodium carbonate aqueous solution, and after removing the unexposed part, it was washed with ion-exchanged water, and the substrate was heated at 230° C. for 20 minutes to form the substrate shown in Table 7. Red filter section indicating film thickness.
[0181] The green coloring composition shown in Table 5 was applied in the same way, and developed after irradiating ultraviolet light through a photomask to form a green filter segment wi...
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Abstract
A color filter is provided with a red filter segment, a green filter segment and a blue filter segment on a substrate. The color filter is suitable for a liquid crystal display device wherein a white LED is used as a light source. The white LED has spectroscopic characteristics wherein a wavelength (Lambada 1) has maximum emission intensity within a range of 430nm-485nm, a peak wavelength (Lambada 2) of a second emission intensity within a range of 530nm-580nm, and a ratio (I2 / I1) of an emission intensity (I2) with the wavelength (Lambada 2) to an emission intensity (I1) with the wavelength (Lambada 1) is 0.2 or more but not more than 0.7. The red filter segment has a 50% transmittance wavelength within a range of 595-610nm, and a transmittance of 85% or more with a wavelength of 630nm. The blue filter segment has a maximum transmittance wavelength of 455nm or less, and a transmittance of 55% or more with a wavelength of 450nm. Each thickness of the red filter segment, the green filter segment and the blue filter segment is 3.0[mu]m or less. The liquid crystal display device provided with the color filter and the white LED as the light source is also disclosed.
Description
technical field [0001] The present invention relates to, for example, a color filter used in a color liquid crystal display device and a liquid crystal display device including the color filter. Background technique [0002] In recent years, due to the advantages of low power consumption and space saving, color liquid crystal displays have been used in various applications such as personal computer (PC) monitors, mobile phone displays, notebook PCs, and portable information terminals. The Braun tube (cathode ray picture tube) TV is also used in LCD TVs. [0003] Color reproducibility is very important in LCD TVs. [0004] The color reproducibility of a color liquid crystal display device is determined by the color of the light emitted by the red, green, and blue filter sections that constitute the color filter, respectively (xR, yR), (xG, yG), (xB , yB) represents the chromaticity points of red, green, and blue filter sections, the area of the triangle defined by these t...
Claims
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IPC IPC(8): G02B5/20G02B5/22G02F1/1335
CPCG02F1/133514G02F1/133603G02B5/201G02B5/20
Inventor 奥津聪砂原建朗西田充志宫川章乃门胁智之清水美绘系井健港浩一
Owner TOYO INK SC HOLD CO LTD