JP4255281B2 - Color filter for transflective color LCD - Google Patents

Description

【０１４０】
次に、この基板のパターン形状および断面形状を走査型レーザー顕微鏡VL2000D（レーザーテック社（株）製）により観察し、散乱度合いをヘイズ、透過、反射率計HR-100（村上色彩技術研究所製）により測定した。なお、ヘイズの測定法はJIS K7105に準ずる。
【０１４１】
結果を図６から図１１および下記表２に示す。
【０１４２】
【表２】

【０１４３】
この結果から、パターンが不連続な形状を示す場合において、ヘイズ値が高いことがわかり、ヘイズとパターン形状に相関関係があることがわかる。
【０１４４】
▲２▼屈折率差の影響確認
上記▲１▼の凹凸形状による効果の確認で使用した基板上に液晶材料（屈折率1.45）を滴下し、パターンが形成されていない透明基板を重ねて上記と同様にヘイズ測定を実施した。測定結果を下記表３に示す。
【０１４５】
【表３】

【０１４６】
上記表２の結果から、上記▲１▼凹凸形状による効果の確認で良好であったヘイズ値が低下していることがわかる。これは、屈折率差の影響を示しているもので、上記▲１▼凹凸形状による効果の確認では、オーバーコート材（屈折率1.5）と空気（屈折率１.0）の屈折率差が0.5と大きいためにヘイズ値が良好であったと推定できる。
【０１４７】
▲３▼擬似パネルによる屈折率差の確認
更に、現状のディスプレイと同様の構成を想定し、上記▲１▼凹凸形状による効果の確認で用いた基板にスパッタリングによりITO膜（１５００Å、屈折率1.8）と、スピンコートにより配向膜（６００Å、屈折率1.6）とを形成した。この基板に対して、上記▲２▼屈折率差の影響確認と同様の方法で、ヘイズ値を測定した。測定結果を下記表４に示す。
【０１４８】
【表４】

【０１４９】
上記表３および表４の結果を比較すると、ヘイズ値がほとんど変化が見られない。これは、ITO膜、配向膜ともにその膜厚が薄く、屈折率差に影響を及ぼさないことを示している。
【０１５０】
以上の結果より、パターン形状と屈折率差が重要なファクターであることがわかった。
【０１５１】
［実施例１］
透明基板として、基板サイズ300×400ｍｍ、厚さ0.7ｍｍ（コーニング社製1737材）を用いて、洗剤洗浄・乾燥工程を行った。
【０１５２】
次に、定法の方法により、スパッタリングにより、Ｃｒ膜を１５００Å成膜し、ポジレジストを塗布し、プレベーク・露光・現像・エッチング・剥離の工程を経て、ブラックマトリクス基板を形成した。
【０１５３】
次に、着色層の形成には以下に示す屈折率1.5の着色感材を用いた。
R感材 カラーモザイクCR９０００（富士フィルムアーチ製）
G感材 カラーモザイクCG９０００（富士フィルムアーチ製）
B感材 カラーモザイクCB９０００（富士フィルムアーチ製）
（Rストライプパターンの形成）
上記のブラックマトリクス基板に対して、R感材をスピンナーにより塗布（620ｒｐｍ、１０秒保持）し、プリベーク８０℃、３分で乾燥した後、図１２に示す繰り返しパターンを有するマスクを用い、１００ｍｊ／ｃｍ^２で露光、現像（専用現像液で７０秒）、ポストベーク（230℃、３０分）を行い、反射部に凹凸部を有するストライプパターンを形成した。
【０１５４】
このパターンをレーザー顕微鏡にて観察し、凹部を半球状として透過部の膜厚から差し引いて反射部の平均膜厚を算出した。透過部の膜厚は、2.0μｍであり、反射部の平均膜厚は、1.0μｍであった。
【０１５５】
（Gストライプパターンの形成）
塗布条件として560ｒｐｍ、現像時間１３０秒以外はRストライプ形成と同様に行った。透過部の膜厚は2.0μｍであり、反射部の平均膜厚は、１.0μｍであった。
【０１５６】
（Bストライプパターンの形成）
塗布条件として690ｒｐｍ、現像時間65秒以外はRストライプ形成と同様に行った。透過部の膜厚は2.0μｍであり、反射部の平均膜厚は、１.0μｍであった。
【０１５７】
（光路差調整層の形成）
光路差調整層としてオーバーコート材（ザ・インクテック社製IT-MP 屈折率1.50）に酸化チタン微粒子を分散させた材料をスピンナー（1000ｒｐｍ、１０秒保持）で塗布し、プリベークとして９０℃、３分で乾燥した後、図１３に示す繰り返しパターンを有するマスクを用い、300ｍｊ／ｃｍ^２で露光、現像（専用現像液６０秒）、ポストベーク（２３０℃、３０分）を行い、反射部のみに光路差調整層を形成した。酸化チタン微粒子を分散したオーバーコート材の屈折率は、1.65であった。光路差調整層と着色層との屈折率差は0.15に調整できた。また反射部の膜厚は4.3μｍ、透過部の膜厚は2.0μｍに調整できた。
【０１５８】
次に、スパッタリングにより、ITO膜を1500Å形成し、柱状スペーサー形成用材料（JSR製オプトマー）をポストベーク後２．３μｍになるように塗布し、反射部のブラックマトリクスに対応する部分に柱状スペーサーを形成するマスクを使用し、反射部に柱状スペーサーを形成した。背面電極基板とカラーフィルタ基板に対して、配向膜を塗布・ラビングした後、外周シール部にシール材を塗布し、重ね合わせて、ネマチック液晶を液晶物質として封入し、封入口を封止し偏向板および位相差板を組み入れて半透過カラー液晶表示装置を組み立てた。
【０１５９】
上記背面側電極基板に設けられた透明電極層とカラーフィルタ基板に設けられた透明電極基板の間に電圧を印加して画面を表示したところ、バックライトからの入射光で十分明るいカラー画像の表示画面を認識することができた。同じく、背面側電極基板に設けられた金属反射電極とカラーフィルタ基板に設けられた透明電極基板の間に電圧を印加して画面を表示したところ、反射用入射光により、その画面は透過光表示と比較してカラーフィルタを2回通過しているにもかかわらず、透過光と同様に十分明るい鮮明な表示画面であった。また反射モードでは更に視覚依存性が改善されていた。
【０１６０】
［実施例２］
以下の光路差調整層の形成以外は、実施例１と同じ工程により作成した。
【０１６１】
光路差調整層としてオーバーコート材（ザ・インクテック社製IT-MP 屈折率1.50）に酸化チタン微粒子を分散させた材料をスピンナー（1000ｒｐｍ、１０秒保持）で塗布し、プリベークとして９０℃、３分で乾燥した後、図１４に示す繰り返しパターンを有するマスクを用い、300ｍｊ／ｃｍ^２で露光、現像（専用現像液６０秒）、ポストベーク（２３０℃、３０分）を行い、反射部のみに表面に凹凸を有する光路差調整層を形成した。酸化チタン微粒子を分散したオーバーコート材の屈折率は、１.65であった。光路差調整層と液晶層（屈折率1.45）との屈折率差は0.20に調整され、光路差調整層と着色層との屈折率差は0.15に調整できた。また反射部の膜厚は実施例１と同様に4.3μｍ、透過部の膜厚は2.0μｍに調整できた。
【０１６２】
実施例１と同様に半透過カラー液晶表示装置として観察したところ、反射モードでは更に視覚依存性が改善されていた。
【０１６３】
【発明の効果】
本発明によれば、反射光用着色層に屈折率増加剤を加えることにより、反射光用着色層の屈折率を調整することができることから、反射光用着色層の凹凸が形成されている側の表面に接触する層を形成する材料を選択する際、反射光用着色層との屈折率差を考慮して選択する必要がないため、材料の選択の幅を広げることができる。また、反射光用着色層の表面に凹凸を形成しかつ、屈折率増加剤を加えることで隣接する層との屈折率差を０．１以上とし、さらにその平均膜厚を透過光用着色層の膜厚より薄くすることのみで、反射光に対する光散乱効果および反射光と透過光との色調を同様なものとすることが同時に可能となる。したがって、簡便な工程で、コスト的に有利に半透過型カラー液晶表示装置用カラーフィルタを形成することが可能となる。
【図面の簡単な説明】
【図１】 本発明の半透過型カラーフィルタの一例を示す概略断面図である。
【図２】 本発明の半透過型カラーフィルタの他の例を示す概略断面図である。
【図３】 本発明の半透過型カラーフィルタの他の例を示す概略断面図である。
【図４】 半透過型カラーフィルタの一例を示す概略断面図である。
【図５】 実施例の１凹凸形状による効果の確認において用いたマスクの例を示した概略図である。
【図６】 実施例の１凹凸形状による効果の確認におけるヘイズの測定結果である。
【図７】 実施例の１凹凸形状による効果の確認におけるヘイズの測定結果である。
【図８】 実施例の１凹凸形状による効果の確認におけるヘイズの測定結果である。
【図９】 実施例の１凹凸形状による効果の確認におけるヘイズの測定結果である。
【図１０】 実施例の１凹凸形状による効果の確認におけるヘイズの測定結果である。
【図１１】 実施例の１凹凸形状による効果の確認におけるヘイズの測定結果である。
【図１２】 実施例１においてRストライプパターンの形成で用いられたマスクの例を示す概略図である。
【図１３】 実施例１において光路差調整層の形成で用いられたマスクの例を示す概略図である。
【図１４】 実施例２において光路差調整層の形成で用いられたマスクの例を示す概略図である。
【図１５】 本発明における凹部において、隣合う凹部間のピッチの例を示した概略図である。 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color filter for a transflective color liquid crystal display device used in a transflective color liquid crystal display device.
[0002]
[Prior art]
Conventionally, as a transmissive liquid crystal display device, a transmissive color liquid crystal display device in which a backlight is arranged on the back surface or side surface of an electrode substrate located on the back surface side and performs color display using this as a light source has been widely used.
[0003]
On the other hand, in recent years, liquid crystal display devices have been expected to be used for portable display devices such as mobile devices, taking advantage of the low power consumption and light weight. However, in the transmissive color liquid crystal display device with a built-in backlight as described above, the power consumption by the built-in light source is large, so the battery usage time is short and the battery occupies a large proportion, so the device is heavy and bulky. was there.
[0004]
For this reason, a reflective color liquid crystal display device without a built-in backlight has been put into practical use. Since this reflective color liquid crystal display device does not have a built-in backlight, low power consumption can be realized, and the device can be made small, light, and thin, and is suitable as a portable display device.
[0005]
However, since the reflective color liquid crystal display device does not function sufficiently in the dark where external light is scarce, the portable liquid crystal display device having both the transmission type and the reflection type sacrifices portability slightly, but is extremely useful in practice. It becomes.
[0006]
The transmissive color liquid crystal display device has a significantly reduced display effect under strong external light such as outdoors, whereas the reflective color liquid crystal display device has a very good display effect. In addition, the reflective color liquid crystal display device does not function at all in a place where the external light is poor, whereas the transmissive color liquid crystal display device is further improved in visibility because the periphery is dark.
[0007]
In view of such circumstances, a transflective liquid crystal display device having the functions of a transmissive liquid crystal display device and a reflective liquid crystal display device has been provided in recent years. It is suitably used for portable terminals and the like that are used even in places where the outside light is scarce (see Patent Document 1 and Patent Document 2).
[0008]
In the case of displaying such a transflective color liquid crystal display device, a color filter is similarly required. In the reflected light region, outside light that has entered normally passes through the color filter twice, whereas transmitted light is transmitted. In the region, the color filter usually passes only once. Therefore, if an attempt is made to obtain the same color tone using the same color material, the color filter in the reflected light region needs to have a film thickness halved compared to the color filter in the transmitted light region. In the light region, it is necessary to form a separate light scattering layer as in the case of a conventional reflective color liquid crystal display device. For example, color filters used in a transflective color liquid crystal display device require various efforts to manufacture. It was a thing.
[0009]
Therefore, the surface of the layer such as the colored layer in the reflected light region is formed in a concavo-convex shape, and the optical path difference between the colored layer in the transmitted light region and the reflected light region is adjusted by contacting the surface of this layer formed in the concavo-convex shape. There is provided a method of obtaining a light scattering effect on reflected light by providing an optical path difference adjusting layer that has a refractive index difference.
[0010]
However, in this method, since it is necessary to make the refractive indexes of two adjacent layers different from each other, the refractive index must be taken into consideration when selecting the material, and the selection range of the material is narrowed. In some cases, this leads to high costs.
[0011]
[Patent Document 1]
JP 2002-341331 A
[Patent Document 2]
JP 2002-350824 A
[0012]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, is easy to manufacture, can be displayed in the same color tone regardless of whether it is reflected light or transmitted light, and is a reflected light region. The main object of the present invention is to provide a color filter for a transflective color liquid crystal display device, which is light-scattered and has a wide range of selection of materials for forming each member, which can be advantageously manufactured in terms of cost. It is.
[0013]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides:Formed on the transparent substrate and the transparent substrate,Concavities and convexities formed on the surfaceA colored layer for reflected light and a colored layer for transmitted light;An optical path difference adjusting layer that is formed only on the reflective colored layer, flattens the unevenness, and adjusts the optical path difference between the reflected light region and the transmitted light region according to the thickness thereof;A color filter for a transflective color liquid crystal display device, wherein the colored layer for reflected light has irregularities formed on the surface of the liquid crystal layer, and the average film thickness is the thickness of the colored layer for transmitted light. Formed so as to be thinner, the colored layer for reflected light, and the aboveOptical path difference adjustment layerA color filter for a transflective color liquid crystal display device, characterized in that a refractive index increasing agent for increasing the refractive index is contained in the colored layer for reflected light so that the difference in refractive index with respect to the reflective layer is 0.1 or more I will provide a.
[0015]
  In the present invention,The irregularities on the surface of the colored layer for reflected light are preferably formed by forming a plurality of concave portions composed of curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. . Thus, if the unevenness on the surface of the colored layer for reflected light is made into a plurality of recesses composed of curved surfaces, it is possible to form the unevenness more easily by performing a photolithography method, and further, coloring for reflected light Since it is easy to control the average film thickness of the layer, it is possible to easily adjust the film thickness difference from the colored layer for transmitted light, so that the color tone of the reflected light and transmitted light can be relatively similar. Can be.
[0016]
In the present invention, the thickness of the optical path difference adjusting layer is preferably in the range of 0.5 μm to 3.5 μm.
[0017]
  In the present invention,A color filter for a transflective color liquid crystal display device comprising a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate, wherein the colored layer for reflected light is a liquid crystal thereof The surface on the side where the unevenness is formed on the layer side surface and the average film thickness is thinner than the thickness of the colored layer for transmitted light, and the unevenness of the colored layer for reflected light is formedOnly above,Depending on its thicknessAdjust optical path difference between reflected light area and transmitted light areaDoA refractive index increasing agent for forming a refractive index in the optical path difference adjusting layer so that an optical path difference adjusting layer is formed and a refractive index difference between the reflected light colored layer and the optical path difference adjusting layer is 0.1 or more. A color filter for a transflective color liquid crystal display device is provided.
[0019]
  In the present invention,The irregularities on the surface of the colored layer for reflected light are preferably formed by forming a plurality of concave portions composed of curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. . If the irregularities on the surface of the colored layer for reflected light are made into a plurality of concave portions constituted by curved surfaces, it is possible to easily form irregularities by performing a photolithography method. Since it is easy to control the average film thickness, it is possible to easily adjust the film thickness difference with the colored layer for transmitted light, so that the color tone of reflected light and transmitted light is relatively similar. It can be.
[0020]
  In the present invention, a difference in refractive index between the colored layer for reflected light and the optical path difference adjusting layer is 0.3 or more.Is preferred.
[0021]
In the present invention, the average thickness of the reflected light colored layer is preferably in the range of 0.4 to 0.95 when the thickness of the colored layer for transmitted light is 1.
[0022]
  The present invention also providesA color filter for a transflective color liquid crystal display device comprising a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate, wherein the colored layer for reflected light is a liquid crystal thereof The surface on the side where the unevenness is formed on the layer side surface and the average film thickness is thinner than the thickness of the colored layer for transmitted light, and the unevenness of the colored layer for reflected light is formedOnly above,Depending on its thicknessAdjust optical path difference between reflected light area and transmitted light areaDoAn optical path difference adjustment layer is formed, and irregularities are also formed on the liquid crystal layer side surface of the optical path difference adjustment layer, and the optical path difference adjustment layer surface is formed on the surface on which the irregularities of the optical path difference adjustment layer are formed. A planarizing layer for the optical path difference adjusting layer is formed, and the optical path is adjusted so that a refractive index difference between the optical path difference adjusting layer and the planarizing layer for the optical path difference adjusting layer is 0.1 or more. Provided is a color filter for a transflective color liquid crystal display device, characterized in that a refractive index increasing agent for increasing the refractive index is contained in the flattening layer for the difference adjusting layer.
[0024]
In the present invention,It is preferable that the colored layer for reflected light also contains a refractive index increasing agent that increases the refractive index. By adding a refractive index increasing agent to the colored layer for reflected light, the refractive index difference between the colored layer for reflected light and the optical path difference adjusting layer, and the optical path difference adjusting layer and the planarizing layer for the optical path difference adjusting layer, The refractive index difference can be easily adjusted, and the material for forming each layer can be selected without considering such a refractive index difference. Therefore, the range of material selection can be greatly expanded, and the cost can be reduced. Because it can.
[0025]
  In the present invention,The irregularities on the surface of the colored layer for reflected light are preferably formed by forming a plurality of concave portions composed of curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. . If the irregularities on the surface of the colored layer for reflected light are made into a plurality of concave portions constituted by curved surfaces, it is possible to easily form irregularities by performing a photolithography method. Since it is easy to control the average film thickness, it is possible to easily adjust the film thickness difference with the colored layer for transmitted light, so that the color tone of reflected light and transmitted light is relatively similar. It can be.
[0026]
  In the present invention,It is preferable that the unevenness on the surface of the optical path difference adjustment layer is formed by forming a plurality of concave portions formed of curved surfaces on the surface of the optical path difference adjustment layer. This is because such a recess is easy to mold and the shape can be adjusted relatively easily.
[0027]
Furthermore, in this invention, it is preferable that the refractive index difference of the said colored layer for reflected light and the said optical path difference adjustment layer is 0.3 or more.
[0029]
  The present invention also provides a color filter for a transflective color liquid crystal display device, comprising a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate, wherein the colored for reflected light The layer is formed with at least one removal portion so that the average film thickness thereof is thinner than the film thickness of the colored layer for transmitted light, and the liquid crystal layer side surface of the colored layer for reflected lightOnly on top, depending on its thicknessAdjust optical path difference between reflected light area and transmitted light areaDoAn optical path difference adjusting layer is formed, and irregularities are formed on the liquid crystal layer side surface of the optical path difference adjusting layer, and the optical path difference adjusting layer surface is formed on the surface of the optical path difference adjusting layer on which the irregularities are formed. In order to obtain flatness, an optical path difference adjusting layer flattening layer is formed, and a refractive index difference between the optical path difference adjusting layer and the optical path difference adjusting layer flattening layer is 0.1 or more. Further, the present invention provides a color filter for a transflective color liquid crystal display device, characterized in that the planarizing layer for the optical path difference adjusting layer contains a refractive index increasing agent for increasing the refractive index.
[0031]
  In the present invention,It is preferable that the unevenness on the surface of the optical path difference adjustment layer is formed by forming a plurality of concave portions formed of curved surfaces on the surface of the optical path difference adjustment layer. This is because such a recess is easy to mold and the shape can be adjusted relatively easily.
[0032]
  The present invention relates to the above-described present invention.A transflective color liquid crystal display device having a color filter for a transflective color liquid crystal display device is provided.
[0033]
According to the present invention, since a color filter for a transflective color liquid crystal display device, which is easy to manufacture, is used, the cost can be reduced.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a color filter for a transflective color liquid crystal display device of the present invention and a transflective color liquid crystal display device having the same will be described.
[0035]
A. Color filter for transflective color LCD
The color filter for a transflective color liquid crystal display device of the present invention (hereinafter sometimes referred to as a transflective color filter) has a shape of a colored layer for reflected light and a layer to which a refractive index increasing agent is added. It can be divided into one embodiment. Each will be described below.
[0036]
(1) First embodiment
The first embodiment of the transflective color filter of the present invention is an embodiment in which the surface of the colored layer for reflected light has irregularities and the refractive index increasing agent is contained in the colored layer. By forming irregularities on the surface of the colored layer, the average thickness of the colored layer for reflected light is made thinner than the thickness of the colored layer for transmitted light.
[0037]
That is, the first embodiment of the present invention is a color filter for a transflective color liquid crystal display device, which includes a transparent substrate, and a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate. ,
The colored layer for reflected light is formed such that irregularities are formed on the surface of the liquid crystal layer, and the average film thickness is thinner than the film thickness of the colored layer for transmitted light,
In the reflected light colored layer, the difference in refractive index between the reflected light colored layer and the layer in contact with the surface of the reflected light colored layer on which the irregularities are formed is 0.1 or more. A refractive index increasing agent for increasing the refractive index is contained.
[0038]
In this embodiment, the refractive index increasing agent is formed on the colored layer for reflected light so that irregularities are formed on the surface of the colored layer for reflected light and the difference in refractive index between adjacent layers is 0.1 or more. Since it is added, the light scattering effect can be obtained by the unevenness on the surface of the colored layer for reflected light, and at the same time, the average thickness of the colored layer for reflected light is made thinner than the thickness of the colored layer for transmitted light. Therefore, it has the advantage that both color tones can be adjusted simultaneously. Moreover, the refractive index difference between adjacent layers can be easily provided by using a refractive index increasing agent. Therefore, there is an advantage that the range of selection of the material of the adjacent layer can be widened.
[0039]
FIG. 1 shows an example of such a transflective color filter of this embodiment. A colored layer 2 composed of a colored layer 2a for transmitted light and a colored layer 2b for reflected light is formed on a transparent substrate 1. FIG. Has been. On the liquid crystal layer side surface of the colored layer 2b for reflected light, that is, the surface opposite to the transparent substrate 1, a plurality of concave portions 3 formed in a pinhole shape are formed.
[0040]
Here, the colored layer for transmitted light 2a and the colored layer for reflected light 2b are formed of the same material to which a refractive index increasing agent is added, and a photolithography method is applied to the surface of the colored layer for reflected light 2b. Thus, a pinhole-shaped recess 3 is formed. Further, an optical path difference adjusting layer 4 is provided on the surface of the reflected light coloring layer 2b in order to adjust the optical path difference in the liquid crystal layer between the reflected light and the transmitted light. A black matrix 5 is formed between the colored layers 2.
[0041]
Thus, by forming the pinhole-shaped recess 3 on the surface of the reflected light coloring layer 2b, the average thickness of the entire reflected light coloring layer 2b can be reduced. And, by adjusting the size and depth of the pinhole-shaped recess 3, the light transmittance of the colored layer for transmitted light and the light transmittance of the colored layer for reflected light can be adjusted. Both color tones can be made similar.
[0042]
The colored layer 2b for reflected light having the pinhole-shaped recess 3 is a layer having a high refractive index to which a refractive index increasing agent is added. Therefore, the material selection range of the adjacent optical path difference adjusting layers 4 is extremely wide, and even when a commonly used material is used, the refractive index difference can be 0.1 or more. In addition, by making the refractive index difference 0.1 or more in this way, a light scattering effect can be obtained. That is, when light enters the region of the pinhole-shaped concave portion 3 formed with a curved surface, if there is a predetermined refractive index difference between the colored layer 2b for reflected light and the optical path difference adjusting layer 4, The incident light is refracted at a predetermined angle at the interface between the two layers. Therefore, in the recessed part 3 comprised by a curved surface, the incident light will radiate | emit at various angles. Thereby, a light scattering effect can be obtained.
[0043]
Thus, the color tone with the transmitted light can be adjusted by simply forming the recess 3 on the surface of the reflected light coloring layer 2b, and the light scattering effect in the reflected light region can be obtained. Moreover, it is not necessary to use a special material as the material of the optical path difference adjusting layer 4. Therefore, since a transflective color filter can be obtained by a simple process, the cost can be reduced.
[0044]
Hereinafter, the transflective color filter of this embodiment will be described separately for each member.
[0045]
1. Colored layer
The colored layer used in the present embodiment is formed on a transparent substrate and is composed of a colored layer for reflected light and a colored layer for transmitted light. The colored layer as used in the present embodiment is composed of pixel portions of a plurality of colors, usually pixel portions of three colors of red (R), green (G), and blue (B), and various patterns such as, for example, It is formed in a pattern such as a mosaic shape, a triangle shape, or a stripe shape.
[0046]
(Colored layer for reflected light)
The first feature of the colored layer for reflected light in this embodiment is that the liquid crystal layer side surface has irregularities and the average film thickness is thinner than the film thickness of the transmitted light colored layer. Is a point.
[0047]
a. Surface irregularities
First, the unevenness will be described. The shape of the irregularities formed on the surface of the colored layer for reflected light is not particularly limited, and incident light is refracted by a difference in refractive index described later and emitted in various directions to obtain a light scattering effect. The shape is not particularly limited as long as it can be formed. However, in order for the incident light to be emitted in various directions, it is preferable that the irregularities are curved surfaces.
[0048]
Moreover, in this embodiment, it is preferable that the unevenness is provided so as to form a recess on the surface of the colored layer for reflected light formed in a planar shape. When the concave and convex portions are formed by forming the concave portions from the surface formed in this way, the concave portions can be easily formed in one step by a simple method such as a photolithography method. In addition, since the adjustment of the average film thickness is easy depending on the size of the recess, the color tone of the transmitted light region and the reflected light region can be easily adjusted.
[0049]
In particular, in this embodiment, the concave and convex portions on the surface of the colored layer for reflected light are formed with curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. It is preferable that By forming a uniform colored layer and forming a plurality of concave portions composed of curved surfaces by a photolithography method or the like only in the reflected light region, the colored layer for reflected light and the colored layer for transmitted light having irregularities can be very easily And you can get Further, as described above, it is easy to adjust the color tone of the transmitted light region and the reflected light region.
[0050]
In addition, it is preferable for such a concave portion to obtain a light scattering effect that a region where the angle with respect to the surface of the transparent substrate is within a predetermined range occupies a large area, specifically, with respect to the surface of the transparent substrate. The region occupying an angle in the range of 4 ° to 90 ° is preferably 40% or more, and more preferably closer to 100%.
[0051]
As shown in FIG. 15, when the gap is provided between adjacent recesses, as shown in FIG. 15, a pitch shown in FIG. 15A is set to one pitch, while the gap is provided between adjacent recesses. If not, the area occupied by the angle in the above-described range with respect to the transparent substrate surface was defined with b shown in FIG. 15B as one pitch.
[0052]
b. Average film thickness
In this embodiment, the unevenness described above is formed, and thereby the average film thickness of the colored layer for reflected light is made thinner than that of the colored layer for transmitted light, so that the color tone in the reflected light region and the color tone in the transmitted light region are reduced. Is to adjust.
[0053]
In this case, the average thickness of the colored layer for reflected light is formed thinner than the thickness of the colored layer for transmitted light, and the color tone of the reflected light region and the transmitted light region is adjusted. The film thickness difference at this time is determined so as to be optimal in accordance with the characteristics of each color liquid crystal display device, the type of pigment contained, and the like. Specifically, the average film thickness of the colored layer for reflected light is preferably in the range of 0.4 to 0.95 when the film thickness of the colored layer for transmitted light is 1, and is particularly preferably 0.00. It is preferable to be within the range of 45 to 0.75. This is because by setting the above-described range, the reflected light region and the transmitted light region have substantially the same color tone, and a transflective color liquid crystal display device with good quality can be obtained.
[0054]
Further, the specific value of the average film thickness of the colored layer for reflected light is the same as that in a general transflective color filter, and is in the range of 0.5 μm to 3 μm.
[0055]
Adjustment of the average film thickness of the colored layer for reflected light in such a case can be easily performed by changing the shape of the unevenness. However, as described above, when the concave portion is formed in the reflected light colored layer formed in a flat shape, the average film thickness can be easily adjusted by adjusting the depth of the concave portion, the size of the concave portion, or the like. It can be said that this adjustment is preferable.
[0056]
c. Refractive index
The refractive index of the colored layer for reflected light in the present embodiment is a refractive index increased by adding a refractive index increasing agent, whereby the refractive index difference from the layer on which the surface side where the irregularities are formed contacts is 0. The refractive index is set to be 1 or more. By providing the refractive index difference in this way, when light is incident on the uneven surface of the colored layer for reflected light, the incident light is refracted and emitted in various directions, thereby obtaining a light scattering effect. Because.
[0057]
In this embodiment, it is preferable that the refractive index difference with the layer on which the surface side where the unevenness is formed contacts is 0.2 or more, particularly the refraction of the colored layer for reflected light so as to be 0.3 or more. It is preferable to adjust the refractive index with a refractive index increasing agent. This is because a more light scattering effect can be obtained and a good display quality can be obtained in the reflected light region.
[0058]
The refractive index of the colored layer for reflected light thus adjusted is not particularly limited, but the refractive index of the colored layer for reflected light is usually the same as that of the layer on which the surface side where the irregularities are formed contacts. The refractive index may be any refractive index so that the refractive index difference is 0.1 or more, but the refractive index of the reflected light colored layer generally formed using an acrylic resin is in the range of 1.49 to 1.50. It is. Increasing the refractive index is preferable because the difference in refractive index between adjacent layers can be increased, but the above range is preferable because of the addition limit of the refractive index increasing agent.
[0059]
In the present embodiment, the layer on the surface side where the irregularities of the colored layer for reflected light are in contact may be any layer such as an optical path difference adjusting layer, a flattening layer, or a liquid crystal layer described later.
[0060]
d. material
The material for forming the colored layer for reflected light in this embodiment is obtained by adding a refractive index increasing agent to the material normally used for the colored layer. Here, the refractive index additive is not particularly limited as long as it is a substance that increases the refractive index of the material by adding, but specifically, titanium oxide fine particles, zinc oxide, zirconia, tin oxide. And aluminum oxide.
[0061]
Such a refractive index increasing agent is preferably added in an amount of 1 to 70 parts by weight, particularly preferably 10 to 50 parts by weight, based on 100 parts by weight of the solid content of the reflected light coloring layer. If the amount added is less than the above range, the effect of increasing the refractive index due to the addition may be insufficient, and if added beyond the above range, problems such as patterning defects may occur. That is not preferable.
[0062]
The material used for the normal colored layer is not particularly limited as long as it can be patterned and can transmit light of a predetermined wavelength. Usually, an acrylic UV curable resin used in a so-called pigment dispersion method in which a pigment is dispersed is used.
[0063]
(Colored layer for transmitted light)
The colored layer for transmitted light in this embodiment is not particularly limited, but it is usually preferable from the viewpoint of simplifying the process that the colored layer for transmitted light is formed of the same material as the colored layer for reflected light.
[0064]
The film thickness of such a colored layer for transmitted light is not particularly limited as long as it is thicker than the average film thickness of the colored layer for reflected light having irregularities on the surface, and specifically, 0.5 μm. It is set within a range of ˜3 μm.
[0065]
2. Optical path difference adjustment layer (flattening layer)
In the present embodiment, it is preferable that a flattening layer for flattening the surface of the colored layer for reflected light on which the unevenness is formed is formed. This is because the surface normally in contact with the liquid crystal layer is preferably a flat surface in order to facilitate alignment of the liquid crystal in the liquid crystal layer, and also from the viewpoint of preventing disconnection of the transparent electrode layer normally formed on the colored layer surface. This is because it is preferably a flat surface.
[0066]
As such a flattening layer, an optical path difference adjusting layer having a function of adjusting the optical path difference of light rays in the liquid crystal layer in the reflected light region and the transmitted light region by having the predetermined thickness. Preferably there is. Usually, the reflected light in the reflected light region is transmitted through the liquid crystal layer by an optical path length that is twice that of the transmitted light in the transmitted light region, so this optical path difference needs to be adjusted. For this reason, it is preferable to form an optical path difference adjusting layer for adjusting the optical path difference as described above.
[0067]
(Refractive index)
In this embodiment, it is preferable that such an optical path difference adjusting layer or flattening layer is formed of a material having a refractive index that is significantly different from the refractive index of the colored layer for reflected light. The optical path difference adjusting layer or the flattening layer is a layer that is in contact with the surface on which the unevenness of the above-described reflected light colored layer is formed. This is because, if formed, the light scattering effect on the surface on which the unevenness of the colored layer for reflected light is formed can be improved.
[0068]
The difference in refractive index is preferably a layer having a relatively low refractive index, considering that the colored layer for reflected light is a high refractive index layer by a refractive index increasing agent. Specifically, it is necessary that the refractive index be 0.1 or more smaller than the refractive index of the colored layer for reflected light, particularly 0.2 or more, particularly 0.3 or more. preferable. Furthermore, the refractive index of the optical path difference adjusting layer or the flattening layer in the present embodiment is preferably in the range of 1.2 to 1.5, particularly in the range of 1.3 to 1.5.
[0069]
As such a material, specifically, a material such as Opstar JN series (manufactured by JSR Corporation) can be used.
[0070]
(Film thickness)
The film thickness of the optical path difference adjusting layer is not particularly limited as long as the optical path difference can be adjusted, and varies greatly depending on the thickness of the liquid crystal layer and the like. It is preferable to be in the range of 3.5 μm, particularly in the range of 1.0 μm to 2.5 μm.
[0071]
The film thickness in the case of a flattening layer that is not intended to adjust the optical path difference and that is intended only for flattening is such that the step with the colored layer for transmitted light is within 0.5 μm. It is preferable.
[0072]
3. Transparent substrate
The transparent substrate used in this embodiment is not particularly limited as long as it is conventionally used in color filters, but is not a flexible transparent rigid material such as quartz glass or synthetic quartz plate. A transparent flexible material having flexibility such as a material, a transparent resin film, an optical resin plate, or the like can be used. Moreover, you may use the transparent substrate which performed the surface treatment for alkali elution prevention, gas barrier property provision, and other purposes as needed.
[0073]
4). Other
In the transflective color filter of this embodiment, various functional layers such as a black matrix, a transparent electrode, an alignment film, and a protective layer may be formed as necessary. Since the positions and materials to be formed are the same as those in the related art, the description thereof is omitted here.
[0074]
(2) Second embodiment
Next, a second embodiment of the transflective color filter of the present invention will be described. The transflective color filter of this embodiment is a transflective color filter having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate,
The colored layer for reflected light is formed such that irregularities are formed on the surface of the liquid crystal layer, and the average film thickness is thinner than the film thickness of the colored layer for transmitted light,
An optical path difference adjusting layer for adjusting the optical path difference between the reflected light region and the transmitted light region is formed on the surface of the colored layer for reflected light on which the unevenness is formed,
The optical path difference adjusting layer contains a refractive index increasing agent for increasing the refractive index so that the refractive index difference between the reflected light coloring layer and the optical path difference adjusting layer is 0.1 or more. It is what.
[0075]
This embodiment is an embodiment in which the above-described refractive index increasing agent is contained in the optical path difference adjusting layer, and the difference from the first embodiment is that the first embodiment has a refractive index increasing agent in the colored layer for reflected light. In contrast to the added mode, in this embodiment, the optical path difference adjusting layer contains a refractive index increasing agent.
[0076]
As described above, the refractive index increasing agent is added to the optical path difference adjusting layer, and although not particularly limited, the colored layer for reflected light does not contain the refractive index increasing agent, thereby providing a large refractive index between the two. It becomes possible to provide a rate difference, and the light scattering effect by the unevenness | corrugation of the liquid crystal layer side surface of the colored layer for reflected light mentioned above can be improved.
[0077]
As described above, this embodiment differs from the first embodiment only in the materials of the colored layer for reflected light and the optical path difference adjusting layer, so these points will be described. The description here will be omitted with reference to the description of the embodiment.
[0078]
(Colored layer for reflected light)
Although the colored layer in this embodiment is not specifically limited, It is preferable that the refractive index increasing agent as mentioned above is not added.
[0079]
The refractive index of such a colored layer for reflected light is not particularly limited, but the refractive index of the colored layer for reflected light is usually 0 with a difference in refractive index from the layer on which the surface side where the irregularities are formed contacts. However, the refractive index of the reflected light colored layer generally formed using an acrylic resin is in the range of 1.49 to 1.50. This is because the above range is preferable in order to obtain a refractive index difference from the optical path difference adjusting layer or the flattening layer.
[0080]
The material for forming the colored layer for reflected light in the present embodiment is not particularly limited as long as it is a material that can be patterned and can transmit light of a predetermined wavelength and has a predetermined refractive index. It is not limited. Usually, an acrylic UV curable resin used in a so-called pigment dispersion method in which a pigment is dispersed is used.
[0081]
(Optical path difference adjustment layer)
In this embodiment, as described above, the optical path difference adjusting layer is formed as a layer adjacent to the surface on which the unevenness of the colored layer for reflected light is formed. Here, the optical path difference adjusting layer functions as a flattening layer for flattening the unevenness of the colored layer for reflected light unless the adjustment of the optical path difference is intended. Therefore, in this embodiment, the optical path difference adjustment layer will be described as a concept including a planarization layer.
[0082]
The optical path difference adjusting layer in this embodiment has a refractive index difference of 0.1 or more, particularly preferably 0.2 or more, particularly 0.3 or more with respect to the colored layer for reflected light having irregularities on the surface described above. It is preferable to adjust the refractive index of the optical path difference adjusting layer with a refractive index increasing agent so as to achieve the above. This is because a more light scattering effect can be obtained and a good display quality can be obtained in the reflected light region.
[0083]
The refractive index of the optical path difference adjusting layer adjusted in this way is not particularly limited, but is usually in the range of 1.5 to 2.0, particularly in the range of 1.5 to 1.8. Is done. Increasing the refractive index is preferable because the difference in refractive index between adjacent layers can be increased, but the above range is preferable because of the addition limit of the refractive index increasing agent.
[0084]
The material for forming the optical path difference adjusting layer in this embodiment is not particularly limited as long as it is transparent. However, a refractive index difference is provided as a high refractive index layer with a colored layer for reflected light using a refractive index increasing agent. In view of the fact that the material is a material, a material having a relatively high refractive index is usually preferably used.
[0085]
Specifically, a material having a refractive index in the range of 1.5 to 1.9, particularly in the range of 1.5 to 1.8 is preferably used.
[0086]
Specific examples of such materials include Photo Nice UR4144 (manufactured by Toray Industries, Inc.), poly (thio) urethane resin, polysulfide resin, polyvinyl resin, allyl diglycol carbonate resin, poly (thio) ester resin, epoxy, A material such as a polyether resin can be used.
[0087]
The optical path difference adjusting layer in this embodiment is a high refractive index layer by adding a refractive index increasing agent to the above-described material, thereby increasing the refractive index difference from the colored layer for reflected light and increasing the light scattering effect. Thus, the display performance in the reflected light region is improved.
[0088]
At this time, since the refractive index increasing agent used is the same as that described in the first embodiment, description thereof is omitted here. Further, the addition amount of the refractive index increasing agent is the same as the amount described in the first embodiment, and the description thereof is omitted here.
[0089]
By adding the refractive index increasing agent in this way, the refractive index of the optical path difference adjusting layer increases so that the refractive index is in the range of 1.5 to 2.0, particularly in the range of 1.5 to 1.8. It is preferable to do so.
[0090]
Thereby, the refractive index difference from the colored layer for reflected light is at least 0.1 or more, preferably 0.2 or more, particularly preferably 0.3 or more.
[0091]
In this embodiment, the optical path difference adjusting layer further has irregularities formed on the surface of the liquid crystal layer, and the optical path difference adjusting layer and the surface of the optical path difference adjusting layer on the side where the irregularities are formed. It is preferable that a refractive index increasing agent is added in the optical path difference adjusting layer so that the refractive index difference with the contacting layer is 0.1 or more.
[0092]
By forming irregularities on the liquid crystal side surface of the optical path difference adjusting layer in this way and making the refractive index different from the layer in contact with the irregular surface, a light scattering effect can be obtained even on the surface of the optical path difference adjusting layer, By combining with the above-described light scattering effect on the uneven surface of the colored layer for reflected light, the light scattering effect can be more effectively exhibited.
[0093]
The layer that contacts the surface of the optical path difference adjusting layer on which the irregularities are formed is not particularly limited. For example, for the optical path difference adjusting layer for flattening the irregularities on the surface of the optical path difference adjusting layer. It may be a planarizing layer or a liquid crystal layer.
[0094]
The refractive index difference with such a layer is preferably 0.1 or more as described above, but is particularly preferably 0.2 or more, and particularly preferably 0.3 or more. This is because the light scattering effect can be more effectively exhibited.
[0095]
In addition, the description of the unevenness in the optical path difference adjusting layer is the same as that described in the “surface unevenness” column of the colored layer for reflected light, and thus the description thereof is omitted here.
[0096]
In this embodiment, it is preferable that the pitch of the concave portions of the colored layer for reflected light is different from the pitch of the optical path difference adjusting layer concave portions of the optical path difference adjusting layer. This is because if the pitches are the same, there is a risk of adverse effects due to light interference.
[0097]
(3) Third embodiment
Next, a third embodiment of the transflective color filter of the present invention will be described. The transflective color filter of the present embodiment is a color filter for a transflective color liquid crystal display device having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate. ,
The colored layer for reflected light is formed such that irregularities are formed on the surface of the liquid crystal layer, and the average film thickness is thinner than the film thickness of the colored layer for transmitted light,
An optical path difference adjusting layer for adjusting the optical path difference between the reflected light region and the transmitted light region is formed on the surface of the colored layer for reflected light on which the irregularities are formed, and the liquid crystal of the optical path difference adjusting layer Concavities and convexities are also formed on the layer side surface,
On the surface of the optical path difference adjustment layer on which the irregularities are formed, a planarizing layer for the optical path difference adjustment layer is formed in order to flatten the surface of the optical path difference adjustment layer,
The optical path difference adjusting layer flattening layer contains a refractive index increasing agent for increasing the refractive index so that the refractive index difference between the optical path difference adjusting layer and the optical path difference adjusting layer flattening layer is 0.1 or more. It is characterized by that.
[0098]
By forming irregularities on the liquid crystal side surface of the optical path difference adjusting layer in this way and making the refractive index different from that of the planarizing layer for the optical path difference adjusting layer in contact with the irregular surface, light scattering is also performed on the surface of the optical path difference adjusting layer. An effect can be obtained. Moreover, a light scattering effect can be more effectively exhibited by combining with the light scattering effect in the uneven | corrugated side surface of the colored layer for reflected light mentioned above.
[0099]
FIG. 2 shows an example in which irregularities are formed on the surface of the optical path difference adjusting layer described above. In this example, a colored layer 2 composed of a colored layer 2a for transmitted light and a colored layer 2b for reflected light is formed on the transparent substrate 1 as in the example shown in FIG. 1, and the colored layer 2b for reflected light is transparent. A plurality of recesses 3 are formed on the surface opposite to the substrate 1. An optical path adjusting layer 4 is formed on the surface of the reflected light colored layer 2b on the side where the recess 3 is formed. An optical path adjustment layer recess 6 is further formed on the surface of the optical path adjustment layer 4 opposite to the transparent substrate 1. An optical path difference adjusting layer flattening layer 7 for flattening the optical path adjusting layer recess 6 is formed on the surface of the optical path adjusting layer 4 on the side where the optical path adjusting layer recess 6 is formed.
[0100]
In this case, the refractive index of the optical path adjustment layer 4 preferably has a refractive index different from the refractive index of the colored layer 2b for reflected light and the refractive index of the planarization layer 7 for optical path difference adjustment layer by 0.1 or more. By adopting such a configuration, a light scattering effect can be obtained in the two regions of the concave portion 3 of the colored layer 2b for reflected light and the optical path difference adjusting layer concave portion 6 of the optical path difference adjusting layer 4. By using such a transflective color filter, a color liquid crystal display device with extremely high display quality in the reflected light region can be obtained.
[0101]
Hereinafter, the transflective color filter of this embodiment will be described in detail. The first feature of this embodiment is that irregularities are formed on the liquid crystal side surface of the optical path difference adjusting layer.
[0102]
The description of the unevenness in the optical path difference adjusting layer is the same as that described in the “surface unevenness” column of the colored layer for reflected light, and the description thereof is omitted here.
[0103]
In this embodiment, it is preferable that the pitch of the concave portions of the colored layer for reflected light is different from the pitch of the optical path difference adjusting layer concave portions of the optical path difference adjusting layer. This is because if the pitches are the same, there is a risk of adverse effects due to light interference.
[0104]
Next, the second feature of this embodiment is that an optical path difference adjusting layer flattening layer is formed on the surface of the optical path difference adjusting layer on which the irregularities are formed. A refractive index increasing agent is added to the control layer so that the refractive index difference with the optical path difference adjusting layer is 0.1 or more.
[0105]
The material for forming such a planarizing layer for an optical path difference adjusting layer is not particularly limited as long as it is a transparent and patternable material, and a general photocurable resin is preferably used. As described above, the planarizing layer for the optical path difference adjusting layer is preferably formed of a material having a relatively high refractive index in consideration of the fact that a refractive index increasing agent is added to form a high refractive index layer. By selecting such a material, the refractive index of the finally obtained optical path difference adjusting layer flattening layer can be increased, and the refractive index difference from the optical path difference adjusting layer can be increased. This is because the light scattering effect can be improved.
[0106]
The description of the material having a relatively high refractive index is the same as that described in the column of the optical path difference adjusting layer of the second embodiment, and thus the description thereof is omitted here.
[0107]
Further, the refractive index increasing agent added to the planarizing layer for optical path difference adjusting layer and the amount of addition thereof, and the final refractive index of the planarizing layer for optical path difference adjusting layer, etc. Since it is the same as that described in the column of the optical path difference adjustment layer, the description here is omitted.
[0108]
In this embodiment, as described above, since the planarization layer for the optical path difference adjusting layer is a high refractive index layer, the optical path difference adjusting layer is preferably formed of a material having a relatively low refractive index. By forming the optical path difference adjusting layer with a material having a low refractive index in this way, it becomes possible to obtain a large refractive index difference from the planarizing layer for the optical path difference adjusting layer, thereby improving the light scattering function. Because it can. Note that the point of forming the optical path difference adjusting layer with a material having a relatively low refractive index is the same as the description of the optical path difference adjusting layer of the first embodiment, and thus the description thereof is omitted here.
[0109]
In this embodiment, it is preferable that a refractive index increasing agent is also added to the colored layer for reflected light so that the refractive index difference with the optical path difference adjusting layer is 0.1 or more. Thus, by adding a refractive index increasing agent to the colored layer for reflected light to form a high refractive index layer, the light scattering effect on the unevenness formed on the optical path difference adjusting layer side surface of the colored layer for reflected light is improved. This is because, in addition to the light scattering effect of the unevenness provided on the liquid crystal layer side surface of the optical path difference adjusting layer described above, it is possible to perform quite effective light scattering.
[0110]
Since the description regarding the addition of the refractive index increasing agent to the reflected light colored layer is the same as the description of the reflected light colored layer in the first embodiment, the description thereof is omitted here.
[0111]
Since the points related to the configuration other than the points described in the present embodiment, such as the description regarding the other layers and the description of the unevenness, are the same as those in the first embodiment, description thereof will be omitted here.
[0112]
(4) Fourth embodiment
Next, a fourth embodiment of the present invention will be described. The transflective color filter of this embodiment is a color filter for a transflective color liquid crystal display device having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate, The colored layer for reflected light has at least one removal portion formed such that the average film thickness is thinner than the thickness of the colored layer for transmitted light,
On the liquid crystal layer side surface of the colored layer for reflected light, an optical path difference adjusting layer for adjusting the optical path difference between the reflected light region and the transmitted light region is formed,
Concavities and convexities are formed on the liquid crystal layer side surface of the optical path difference adjusting layer,
The refractive index of the optical path difference adjusting layer is adjusted so that the refractive index difference between the optical path difference adjusting layer and the layer contacting the surface of the optical path difference adjusting layer on which the irregularities are formed is 0.1 or more. It is characterized by containing a refractive index increasing agent for enhancing.
[0113]
According to the present invention, unevenness is formed on the surface of the optical path difference adjustment layer required for adjusting the optical path difference, and the refractive index difference with the layer in contact with the surface on which the unevenness is formed is 0.1. Since the refractive index increasing agent is added to the optical path difference adjusting layer as described above, a light scattering effect can be obtained in this optical path difference adjusting layer. Therefore, it is possible to adjust the optical path difference in the liquid crystal layer between the reflected light region and the transmitted light region and improve the image display quality in the reflected light region.
[0114]
FIG. 3 shows an example of this embodiment. In this example, a colored layer 2 composed of a colored layer 2a for transmitted light and a colored layer 2b for reflected light is formed on a transparent substrate 1. The colored layer for reflected light 2b in this example has the same film thickness as the colored layer for transmitted light 2a, but a part thereof is removed to form the removed portion. Thus, by removing a part of the colored layer for reflected light 2b, the average film thickness as the colored layer for reflected light 2b is reduced, and thereby the transmitted light region and the reflected light region have the same color tone. It is prepared as follows.
[0115]
An optical path difference adjusting layer 4 is formed on the colored layer for reflected light, and an optical path difference adjusting layer recess 6 is formed on the surface opposite to the transparent substrate 1, and further on the optical path difference adjusting layer recess 6. An optical path difference adjusting layer flattening layer 7 is formed. A black matrix 5 is disposed between the colored layers 2.
[0116]
In the example shown in FIG. 3, the optical path difference adjusting layer 4 is refracted so that the refractive index of the optical path difference adjusting layer 4 and the refractive index of the optical path difference adjusting layer flattening layer 7 have a refractive index difference of 0.1 or more. A rate increasing agent is added, whereby a light diffusion effect can be obtained on the surface of the optical path difference adjusting layer 4 where the optical path difference adjusting layer recess 6 is formed. Therefore, both the effect of adjusting the optical path difference and the light scattering effect can be obtained simply by providing the optical path difference adjusting layer 4 having a plurality of recesses on the surface.
[0117]
Hereinafter, the transflective color filter of this embodiment will be described separately for each member.
[0118]
1. Colored layer
The colored layer used in this embodiment is the same as that described in the first embodiment except for the shape of the colored layer for reflected light, and thus description of points other than the shape of the colored layer for reflected light is omitted. To do.
[0119]
In this embodiment, the colored layer for reflected light has a shape in which at least one removal portion is formed so that the average thickness of the entire colored layer for reflected light is thinner than the thickness of the colored layer for transmitted light. Is. That is, in this embodiment, the reflected light colored layer has a shape such that a part thereof is completely removed and at least one removal portion is formed in the reflected light colored layer.
[0120]
The average film thickness of the reflected light coloring layer and the ratio of the thickness of the transmitted light coloring layer thus reduced are the same as those described in the first embodiment. Therefore, explanation here is omitted.
[0121]
2. Optical path difference adjustment layer
In this embodiment, an optical path difference adjusting layer is formed on the surface of the colored layer for reflected light, and irregularities are formed on the surface of the liquid crystal layer, and the irregularities of the optical path difference adjusting layer and the optical path difference adjusting layer are formed. It is characterized in that a refractive index increasing agent is added to the optical path difference adjusting layer so that the refractive index difference with the layer in contact with the surface on which the is formed is 0.1 or more.
[0122]
Regarding such an optical path difference adjusting layer, it is the same as that described in the second embodiment, and also regarding the surface irregularities, the explanation of “surface irregularities” of the optical path difference adjusting layer in the second embodiment is as follows. Since it is the same, description here is abbreviate | omitted. In addition, the description of the layer that contacts the surface on which the unevenness of the optical path difference adjusting layer is formed is the same as the description of the “surface unevenness” column of the optical path difference adjusting layer in the second embodiment. Explanation here is omitted.
[0123]
3. Other
Since the description regarding the transparent substrate and other layers in the present embodiment is the same as the description in the first embodiment, the description is omitted here.
[0124]
(5) Fifth embodiment
Finally, a fifth embodiment of the transflective color filter of the present invention will be described. The transflective color filter of this embodiment is a color filter for a transflective color liquid crystal display device having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate,
The colored layer for reflected light has at least one removal portion formed such that the average film thickness is thinner than the thickness of the colored layer for transmitted light,
On the liquid crystal layer side surface of the colored layer for reflected light, an optical path difference adjusting layer for adjusting the optical path difference between the reflected light region and the transmitted light region is formed,
Concavities and convexities are formed on the liquid crystal layer side surface of the optical path difference adjusting layer,
In order to obtain flatness on the surface of the optical path difference adjustment layer, a planarization layer for the optical path difference adjustment layer is formed on the surface of the optical path difference adjustment layer on which the irregularities are formed,
A refractive index increasing agent for increasing a refractive index is provided in the optical path difference adjusting layer planarizing layer so that a refractive index difference between the optical path difference adjusting layer and the optical path difference adjusting layer planarizing layer is 0.1 or more. It is characterized by being contained.
[0125]
This embodiment is an embodiment in which the above-described refractive index increasing agent is contained in the planarizing layer for the optical path difference adjusting layer. The difference from the fourth embodiment is that the fourth embodiment has a refractive index in the optical path difference adjusting layer. In contrast to the embodiment in which the increasing agent is added, the present embodiment is that the refractive index increasing agent is contained in the planarizing layer for the optical path difference adjusting layer.
[0126]
In this way, the refractive index increasing agent is added to the planarizing layer for the optical path difference adjusting layer, and although not particularly limited, the optical path difference adjusting layer does not contain the refractive index increasing agent. It is possible to provide a large difference in refractive index, and the light scattering effect due to the irregularities on the liquid crystal layer side surface of the optical path difference adjusting layer described above can be improved.
[0127]
As described above, this embodiment differs from the fourth embodiment only in the materials of the optical path difference adjusting layer and the optical path difference adjusting layer flattening layer, so these points will be described. The description here is omitted with reference to the description of the fourth embodiment.
[0128]
The description of the planarizing layer for optical path difference adjustment layer used in this embodiment is the same as the description in the third embodiment, and the description thereof is omitted here.
[0129]
Furthermore, the optical path difference adjusting layer in this embodiment is not particularly limited, but it is preferable that the refractive index increasing agent as described above is not added. In this embodiment, as described above, since the planarization layer for the optical path difference adjusting layer is a high refractive index layer, the optical path difference adjusting layer is preferably formed of a material having a relatively low refractive index. By forming the optical path difference adjusting layer with a material having a low refractive index in this way, it becomes possible to obtain a large refractive index difference from the planarizing layer for the optical path difference adjusting layer, thereby improving the light scattering function. Because it can. Note that the point of forming the optical path difference adjusting layer with a material having a relatively low refractive index is the same as the description of the optical path difference adjusting layer of the first embodiment, and thus the description thereof is omitted here.
[0130]
(6) Other
As another example of obtaining the light scattering effect by forming irregularities on the surface as described above and providing a difference in refractive index from adjacent layers, an example as shown in FIG. 4 can be given.
[0131]
Here, the optical path difference adjusting layer 4 formed on the transparent substrate 1 is provided with irregularities, specifically, an optical path difference adjusting layer concave portion 6 on the surface opposite to the transparent substrate 1, and the optical path difference adjusting layer 4 side is colored. By including a refractive index increasing agent on either side of the layer 2, a refractive index difference is provided between the optical path difference adjusting layer 4 and the colored layer 2 to obtain a light scattering effect.
[0132]
The coloring layer 2, the optical path difference adjusting layer 4, the optical path difference adjusting layer recess 6 and the like used in this example, and the kind and amount of addition of the refractive index increasing agent are the same as those described in the above embodiment. The description in is omitted.
[0133]
B. Transflective color liquid crystal display device
The transflective color liquid crystal display device of the present invention is formed by sealing liquid crystal between the above-described transflective color filter and a counter substrate. Therefore, it has the advantage of the above-described transflective color filter, that is, it can be manufactured by a simple process, resulting in cost reduction as it is.
[0134]
The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
[0135]
【Example】
The following examples further illustrate the invention.
[0136]
Preliminary experiment
(1) Confirmation of effect by uneven shape
As a transparent substrate, a detergent cleaning / drying process was performed using a substrate size of 300 × 400 mm and a thickness of 0.7 mm (1737 material manufactured by Corning).
[0137]
Next, an overcoat material (IT-MP refractive index 1.50 manufactured by The Inktec Co., Ltd.) was applied with a spinner (600 rpm, held for 10 seconds), dried on a hot plate at 70 ° C. for 3 minutes, and then the pattern shown in FIG. 300mj / cm exposure through the pitch mask²Then, after developing with a dedicated developer for 60 seconds, baking was performed in an oven at 230 ° C. for 30 minutes to obtain a relief pattern having a concavo-convex shape on the surface.
[0138]
Note that the masks with the above pattern pitch are all circular patterns of dots, and No. 1 shown in FIG. 1-No. The diameter and pitch of the circular pattern were changed for each of the six regions. The diameter and pitch of the circular pattern in each region are shown in Table 1 below.
[0139]
[Table 1]

[0140]
Next, the pattern shape and cross-sectional shape of this substrate were observed with a scanning laser microscope VL2000D (Lasertec Corp.), and the degree of scattering was measured using a haze, transmission and reflectance meter HR-100 (Murakami Color Research Laboratory). It was measured by. Note that the haze measurement method conforms to JIS K7105.
[0141]
The results are shown in FIGS. 6 to 11 and Table 2 below.
[0142]
[Table 2]

[0143]
From this result, it can be seen that when the pattern shows a discontinuous shape, the haze value is high, and there is a correlation between the haze and the pattern shape.
[0144]
(2) Confirmation of influence of refractive index difference
A liquid crystal material (refractive index: 1.45) was dropped on the substrate used for confirming the effect of the uneven shape of (1) above, and a transparent substrate on which no pattern was formed was stacked, and haze measurement was performed in the same manner as described above. The measurement results are shown in Table 3 below.
[0145]
[Table 3]

[0146]
From the results of Table 2 above, it can be seen that the haze value, which was good in the confirmation of the effect by the above (1) uneven shape, is lowered. This shows the influence of the difference in refractive index. (1) In the confirmation of the effect by the uneven shape, the refractive index difference between the overcoat material (refractive index 1.5) and air (refractive index 1.0) is 0.5. Therefore, it can be estimated that the haze value was good.
[0147]
(3) Confirmation of refractive index difference by pseudo panel
Furthermore, assuming the same configuration as the current display, (1) the ITO film (1500 mm, refractive index 1.8) by sputtering and the alignment film (600 mm, refractive) by spin coating on the substrate used for confirming the effect by the above-mentioned (1) uneven shape. Rate 1.6). With respect to this substrate, haze value was measured by the same method as the above confirmation of the effect of the difference in refractive index (2). The measurement results are shown in Table 4 below.
[0148]
[Table 4]

[0149]
When the results of Table 3 and Table 4 are compared, the haze value hardly changes. This indicates that both the ITO film and the alignment film are thin and do not affect the refractive index difference.
[0150]
From the above results, it was found that the pattern shape and the refractive index difference are important factors.
[0151]
[Example 1]
As a transparent substrate, a detergent cleaning / drying process was performed using a substrate size of 300 × 400 mm and a thickness of 0.7 mm (1737 material manufactured by Corning).
[0152]
Next, by a usual method, a 1500 nm Cr film was formed by sputtering, a positive resist was applied, and a black matrix substrate was formed through prebaking, exposure, development, etching, and peeling processes.
[0153]
Next, a colored photosensitive material having a refractive index of 1.5 shown below was used for forming the colored layer.
R Sensitive Material Color Mosaic CR9000 (Fuji Film Arch)
G Sensitive Material Color Mosaic CG9000 (Fuji Film Arch)
B Sensitive Material Color Mosaic CB9000 (Fuji Film Arch)
(R stripe pattern formation)
An R-sensitive material was applied to the black matrix substrate with a spinner (620 rpm, held for 10 seconds), dried at prebaking at 80 ° C. for 3 minutes, and then a mask having a repetitive pattern shown in FIG. cm²Then, exposure, development (70 seconds with a dedicated developer), and post-baking (230 ° C., 30 minutes) were performed to form a stripe pattern having an uneven portion on the reflection portion.
[0154]
This pattern was observed with a laser microscope, and the average thickness of the reflecting portion was calculated by subtracting the concave portion from the thickness of the transmitting portion with a hemispherical shape. The film thickness of the transmission part was 2.0 μm, and the average film thickness of the reflection part was 1.0 μm.
[0155]
(G stripe pattern formation)
Except for 560 rpm and developing time of 130 seconds as coating conditions, the same procedure as in the R stripe formation was performed. The film thickness of the transmission part was 2.0 μm, and the average film thickness of the reflection part was 1.0 μm.
[0156]
(B stripe pattern formation)
Except for 690 rpm and development time of 65 seconds as coating conditions, the same procedure as in the R stripe formation was performed. The film thickness of the transmission part was 2.0 μm, and the average film thickness of the reflection part was 1.0 μm.
[0157]
(Formation of optical path difference adjusting layer)
As an optical path difference adjusting layer, a material in which titanium oxide fine particles are dispersed in an overcoat material (IT-MP refractive index of 1.50 manufactured by The Inktec Co., Ltd.) is applied with a spinner (1000 rpm, held for 10 seconds). 300 mj / cm using a mask having a repeating pattern shown in FIG.²Then, exposure, development (dedicated developer 60 seconds), and post-baking (230 ° C., 30 minutes) were performed, and an optical path difference adjusting layer was formed only on the reflection portion. The refractive index of the overcoat material in which the titanium oxide fine particles were dispersed was 1.65. The refractive index difference between the optical path difference adjusting layer and the colored layer could be adjusted to 0.15. Moreover, the film thickness of the reflection part could be adjusted to 4.3 μm, and the film thickness of the transmission part could be adjusted to 2.0 μm.
[0158]
Next, 1500 IT of ITO film is formed by sputtering, and a columnar spacer forming material (JSR optomer) is applied to a thickness of 2.3 μm after post-baking. Using the mask to be formed, columnar spacers were formed in the reflective portion. After coating and rubbing the alignment film on the back electrode substrate and the color filter substrate, a sealing material is applied to the outer peripheral seal part and superposed to enclose nematic liquid crystal as a liquid crystal substance, and the enclosing port is sealed and deflected A transflective color liquid crystal display device was assembled by incorporating a plate and a retardation plate.
[0159]
When a screen is displayed by applying a voltage between the transparent electrode layer provided on the back electrode substrate and the transparent electrode substrate provided on the color filter substrate, a sufficiently bright color image is displayed with incident light from the backlight. I was able to recognize the screen. Similarly, when a screen is displayed by applying a voltage between the metal reflective electrode provided on the back electrode substrate and the transparent electrode substrate provided on the color filter substrate, the screen is transmitted light display by the incident light for reflection. Although it passed through the color filter twice, the display screen was sufficiently bright and clear as with the transmitted light. In the reflection mode, the visual dependency was further improved.
[0160]
[Example 2]
Except for the formation of the following optical path difference adjusting layer, it was prepared by the same process as in Example 1.
[0161]
As an optical path difference adjusting layer, a material in which titanium oxide fine particles are dispersed in an overcoat material (IT-MP refractive index of 1.50 manufactured by The Inktec Co., Ltd.) is applied with a spinner (1000 rpm, held for 10 seconds). After drying in minutes, using a mask having a repetitive pattern shown in FIG. 14, 300 mj / cm²Then, exposure, development (dedicated developer 60 seconds), and post-baking (230 ° C., 30 minutes) were performed to form an optical path difference adjusting layer having irregularities on the surface only on the reflection portion. The refractive index of the overcoat material in which the titanium oxide fine particles were dispersed was 1.65. The refractive index difference between the optical path difference adjusting layer and the liquid crystal layer (refractive index 1.45) was adjusted to 0.20, and the refractive index difference between the optical path difference adjusting layer and the colored layer was adjusted to 0.15. Further, the film thickness of the reflection part was adjusted to 4.3 μm as in Example 1, and the film thickness of the transmission part was adjusted to 2.0 μm.
[0162]
When observed as a transflective color liquid crystal display device in the same manner as in Example 1, the visual dependence was further improved in the reflection mode.
[0163]
【The invention's effect】
According to the present invention, the refractive index of the colored layer for reflected light can be adjusted by adding a refractive index increasing agent to the colored layer for reflected light. When selecting a material for forming a layer in contact with the surface, it is not necessary to select a material in consideration of the difference in refractive index with the colored layer for reflected light, so that the range of selection of materials can be expanded. Further, by forming irregularities on the surface of the colored layer for reflected light and adding a refractive index increasing agent, the refractive index difference with the adjacent layer is made 0.1 or more, and the average film thickness is further changed to the colored layer for transmitted light It is possible to make the light scattering effect on the reflected light and the same color tone of the reflected light and the transmitted light at the same time only by making the film thickness thinner than this. Therefore, it is possible to form a color filter for a transflective color liquid crystal display device with a simple process and advantageously in terms of cost.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an example of a transflective color filter of the present invention.
FIG. 2 is a schematic sectional view showing another example of the transflective color filter of the present invention.
FIG. 3 is a schematic cross-sectional view showing another example of the transflective color filter of the present invention.
FIG. 4 is a schematic cross-sectional view showing an example of a transflective color filter.
FIG. 5 is a schematic view showing an example of a mask used in confirming the effect of one uneven shape according to an embodiment.
FIG. 6 is a measurement result of haze in confirming the effect of one uneven shape according to an example.
FIG. 7 is a measurement result of haze in confirming the effect of one uneven shape according to an example.
FIG. 8 is a measurement result of haze in confirming the effect of one uneven shape according to an example.
FIG. 9 is a measurement result of haze in confirming the effect of one uneven shape according to an example.
FIG. 10 is a measurement result of haze in confirming the effect of one uneven shape according to an example.
FIG. 11 is a measurement result of haze in confirming the effect of one uneven shape in an example.
12 is a schematic view showing an example of a mask used in forming an R stripe pattern in Example 1. FIG.
13 is a schematic view showing an example of a mask used in forming an optical path difference adjusting layer in Example 1. FIG.
14 is a schematic view showing an example of a mask used in forming an optical path difference adjusting layer in Example 2. FIG.
FIG. 15 is a schematic view showing an example of a pitch between adjacent concave portions in the concave portion according to the present invention.

Claims (15)

A transparent substrate, a colored layer for reflected light and a colored layer for transmitted light that are formed on the surface of the transparent substrate and have irregularities formed on the surface of the liquid crystal layer , and the colored layer for transmitted light are formed only on the reflective colored layer, and the irregularities are flattened. And a color filter for a transflective color liquid crystal display device having an optical path difference adjusting layer that adjusts an optical path difference between the reflected light region and the transmitted light region depending on the thickness thereof ,
The colored layer for reflected light is formed so that an average film thickness is thinner than the film thickness of the colored layer for transmitted light,
The reflective color layer contains a refractive index increasing agent that increases the refractive index so that the refractive index difference between the reflected light colored layer and the optical path difference adjusting layer is 0.1 or more. A characteristic color filter for a transflective color liquid crystal display device.   The unevenness on the surface of the colored layer for reflected light is formed by forming a plurality of concave portions composed of curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. The color filter for a transflective color liquid crystal display device according to claim 1. 3. The color filter for a transflective color liquid crystal display device according to claim 1 , wherein a thickness of the optical path difference adjusting layer is in a range of 0.5 μm to 3.5 μm. A color filter for a transflective color liquid crystal display device having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate,
The colored layer for reflected light is formed such that irregularities are formed on the liquid crystal layer side surface, and the average film thickness is thinner than the film thickness of the colored layer for transmitted light,
An optical path difference adjusting layer that adjusts the optical path difference between the reflected light region and the transmitted light region depending on the thickness is formed only on the surface on the uneven side of the colored layer for reflected light.
The optical path difference adjusting layer contains a refractive index increasing agent that increases the refractive index so that the refractive index difference between the colored layer for reflected light and the optical path difference adjusting layer is 0.1 or more. A color filter for a transflective color liquid crystal display device.   The irregularities on the surface of the colored layer for reflected light are formed by forming a plurality of concave portions composed of curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. The color filter for a transflective color liquid crystal display device according to claim 4. The semi-transmission according to any one of claims 1 to 5, wherein a difference in refractive index between the colored layer for reflected light and the optical path difference adjusting layer is 0.3 or more. Type color liquid crystal display color filter.   The average film thickness of the reflected light colored layer is in the range of 0.4 to 0.95, where 1 is the film thickness of the colored layer for transmitted light. The color filter for a transflective color liquid crystal display device according to claim 6. A color filter for a transflective color liquid crystal display device having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate,
The colored layer for reflected light is formed such that irregularities are formed on the liquid crystal layer side surface, and the average film thickness is thinner than the film thickness of the colored layer for transmitted light,
Wherein the only surface on which unevenness of the reflected light for the colored layer is formed, the optical path difference adjustment layer for adjusting an optical path difference between the transmitted light region and the reflective light region by the thickness is formed, the optical path difference adjusting layer Asperities are also formed on the surface of the liquid crystal layer,
On the surface of the optical path difference adjustment layer on which the irregularities are formed, a planarizing layer for the optical path difference adjustment layer is formed in order to flatten the optical path difference adjustment layer surface,
The optical path difference adjusting layer planarizing layer contains a refractive index increasing agent that increases the refractive index so that the refractive index difference between the optical path difference adjusting layer and the optical path difference adjusting layer planarizing layer is 0.1 or more. A color filter for a transflective color liquid crystal display device.   The reflected light coloring layer contains a refractive index increasing agent for increasing the refractive index so that the refractive index difference between the optical path difference adjusting layer and the reflected light coloring layer is 0.1 or more. The color filter for a transflective color liquid crystal display device according to claim 8.   The irregularities on the surface of the colored layer for reflected light are formed by forming a plurality of concave portions composed of curved surfaces on the surface of the colored layer for reflected light formed with the same film thickness as the colored layer for transmitted light. The color filter for a transflective color liquid crystal display device according to claim 8 or 9.   11. The claim according to claim 8, wherein the unevenness on the surface of the optical path difference adjusting layer is formed by forming a plurality of concave portions formed of curved surfaces on the surface of the optical path difference adjusting layer. A color filter for a transflective color liquid crystal display device according to the item.   The semi-transmission according to any one of claims 8 to 11, wherein a difference in refractive index between the colored layer for reflected light and the optical path difference adjusting layer is 0.3 or more. Type color liquid crystal display color filter. A color filter for a transflective color liquid crystal display device having a transparent substrate, a colored layer for reflected light and a colored layer for transmitted light formed on the transparent substrate,
The colored layer for reflected light has at least one removal portion formed so that an average film thickness thereof is thinner than a film thickness of the colored layer for transmitted light,
Only on the liquid crystal layer side surface of the colored layer for reflected light, an optical path difference adjusting layer for adjusting the optical path difference between the reflected light region and the transmitted light region is formed according to its thickness ,
Unevenness is formed on the liquid crystal layer side surface of the optical path difference adjusting layer,
On the surface of the optical path difference adjustment layer on which the irregularities are formed, an optical path difference adjustment layer flattening layer is formed to obtain flatness on the optical path difference adjustment layer surface,
A refractive index increasing agent for increasing a refractive index is provided in the optical path difference adjusting layer flattening layer so that a refractive index difference between the optical path difference adjusting layer and the optical path difference adjusting layer flattening layer is 0.1 or more. A color filter for a transflective color liquid crystal display device, comprising:   The transflective type according to claim 12 or 13, wherein the irregularities on the surface of the optical path difference adjusting layer are formed by forming a plurality of concave portions formed of curved surfaces on the surface of the optical path difference adjusting layer. Color filter for color liquid crystal display devices.   A transflective color liquid crystal display device comprising the color filter for transflective color liquid crystal display according to any one of claims 1 to 14.

Images