JP2011100028A5

JP2011100028A5 -

Info

Publication number: JP2011100028A5
Application number: JP2009255357A
Authority: JP
Filing date: 2009-11-06
Publication date: 2012-11-01
Anticipated expiration: 2029-11-06

Description

［液晶表示装置の黒表示時の視認性評価］
作製した液晶表示装置を黒表示させ、液晶パネルの法線方向（正面）および法線方向か
ら４５°傾けた方位（斜め）より漏れてくる光（直交透過光；漏れ光）の量を目視観察し
た。光漏れなく黒く見えた場合を○、漏れ光による色づきが見られた場合を×を評価した。結果を下記表４に示す。

[Visibility evaluation during black display of liquid crystal display devices]
The produced liquid crystal display device is displayed in black, and the amount of light (orthogonal transmitted light; leaked light) leaking from the normal direction (front) of the liquid crystal panel and an orientation (oblique) 45 ° from the normal direction is visually observed. did. A case where black was observed without light leakage and a case where coloring due to light leakage was observed were evaluated as x. The results are shown in Table 4 below.

これに対し、比較例３では、Ｒｔｈ（Ｒ）＜Ｒｔｈ（Ｇ）＞Ｒｔｈ（Ｂ）の関係となり、比較例４では、Ｒｔｈ（Ｒ）＞Ｒｔｈ（Ｇ）＜Ｒｔｈ（Ｂ）の関係となり、位相差のバランスは不良であった。その結果、斜め方向の黒表示において色ずれが生じ、視認性が不良となった。さらに、比較例４においては、緑色画素の明度、カラーフィルタにおけるコントラスト、及び液晶表示装置のコントラストも低下した。 On the other hand, in Comparative Example 3, Rth (R) <Rth (G)> Rth (B), and in Comparative Example 4 , Rth (R)> Rth (G) <Rth (B). The balance of the phase difference was poor. As a result, color misregistration occurred in black display in an oblique direction, resulting in poor visibility. Further, in Comparative Example 4, the brightness of the green pixel, the contrast in the color filter, and the contrast of the liquid crystal display device were also lowered.

Claims

C. I. Pigment Green 58 and C.I. I. A green coloring composition for a color filter comprising Pigment Green 36 in a weight ratio of 99: 1 to 35:65, a transparent resin, a solvent, and a photocrosslinking agent. A green colored composition for a color filter, wherein a retardation value Rth in a thickness direction represented by the following formula of a green colored layer formed of the green colored composition is −15 to +15 nm.
Rth = {(Nx + Ny) / 2−Nz} × d
(Where Nx is the refractive index in the x direction in the xy plane of the colored layer, Ny is the refractive index in the y direction in the xy plane of the colored pixel layer, and Nz is the refractive index in the thickness direction of the colored pixel layer, d represents the thickness (nm) of the colored layer.)

A color filter comprising a plurality of color pixels including a red pixel, a green pixel, and a blue pixel on a transparent substrate, wherein the green pixel is formed of the green coloring composition according to claim 1.

C. I. Pigment Green 58 and C.I. I. By adjusting the weight ratio of Pigment Green 36, the respective thickness direction retardation values Rth (R), Rth (G), and Rth (B) of the red pixel, the green pixel, and the blue pixel are Rth (R)> The color filter according to claim 2, wherein Rth (G)> Rth (B) or Rth (R) <Rth (G) <Rth (B) is satisfied.

C. I. Pigment Green 58 and C.I. I. By adjusting the weight ratio of Pigment Green 36 and adding a phase difference adjusting agent to the red coloring composition forming the red pixel, the thickness direction retardation value Rth (R of each of the red pixel, the green pixel, and the blue pixel is determined. ), Rth (G), and Rth (B) satisfy Rth (R) <Rth (G) <Rth (B).

C. I. Pigment Green 58 and C.I. I. The weight ratio of Pigment Green 36 is adjusted, and a red color composition for forming a red pixel and a blue color composition for forming a blue pixel are blended with a phase difference adjusting agent to thereby adjust the red pixel, the green pixel, and the blue pixel. The thickness direction retardation values Rth (R), Rth (G), and Rth (B) satisfy Rth (R)> Rth (G)> Rth (B), respectively. Color filter.

A liquid crystal display device comprising the color filter according to claim 2 .