JPH03296720A - Optical modulating device - Google Patents

Optical modulating device

Info

Publication number
JPH03296720A
JPH03296720A JP2099245A JP9924590A JPH03296720A JP H03296720 A JPH03296720 A JP H03296720A JP 2099245 A JP2099245 A JP 2099245A JP 9924590 A JP9924590 A JP 9924590A JP H03296720 A JPH03296720 A JP H03296720A
Authority
JP
Japan
Prior art keywords
light
color
wavelength
light source
color filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2099245A
Other languages
Japanese (ja)
Inventor
Narikazu Takahashi
高橋 成和
Sadao Masubuchi
貞夫 増渕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Priority to JP2099245A priority Critical patent/JPH03296720A/en
Publication of JPH03296720A publication Critical patent/JPH03296720A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To obtain a display screen which has high color purity over a wide screen by installing a wavelength selecting member which diffracts light to narrower wavelength bands of respective spectra than a color filter on the optical path connecting a light source and an optical modulating element. CONSTITUTION:The wavelength selecting member 2 which diffracts the light spectrally to the narrower wavelength ranges of respective spectra than the color filter on the optical path connecting the light source 1 and optical modulating element 4 is installed. Then the light of a halogen lamp 1 as the light source is transmitted by the wavelength selecting member 2 constituted by sandwiching a birefringent plate between two polarizing plates and guided to a light guide member 3 to obtain a linear light source. Further, a liquid crystal shutter cell 4 which is the optical modulating element transmits the light from this linear light source spectrally. The light emitted by the shutter cell 4 is determined by multiplying the spectrum of a gelatin color filter and the spectrum of the wavelength selecting member 2; and its wavelength range is narrow and there is no wavelength overlap part between colors. Consequently, the crosstalk of writing light becomes small and a print color range where the color purity is high can be printed as a color print of high quality or displayed out.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、カラー光シャッター装置、カラー画像表示装
置等の光変調装置に関し、特にスペクトル幅の狭いカラ
ー光を出力する分光特性のよい光変調装置に関する。
Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a light modulation device such as a color light shutter device or a color image display device, and in particular to a light modulation device with good spectral characteristics that outputs color light with a narrow spectral width. Regarding equipment.

〔従来の技術〕[Conventional technology]

コンピューターの情報処理能力の向上に対応して、周辺
機器の機能向上が強く要求されている。
In response to improvements in the information processing capabilities of computers, there is a strong demand for improvements in the functionality of peripheral devices.

たとえば、処理された情報を、印刷の形で人間に伝える
プリンターにおいては、より複雑な情報を的確、直感的
に表現するため、プリントのカラー化が要求されている
For example, printers that transmit processed information to humans in the form of prints are required to print in color in order to accurately and intuitively express more complex information.

前記要求に答える方式の一つとして、第6図に示すよう
に、赤色のカラーフィルターRを有し赤色の透過率を制
御する液晶画素と、緑色のカラーフィルターGを有し緑
色の透過率を制御する液晶画素と、青色のカラーフィル
ターBを有し青色の透過率を制御する液晶画素を複数配
列した液晶シャッターセル18により光源17からの光
の強度を赤、緑、青色それぞれ独立に制御し、制御され
た光を結像光学系19で感光部材20の表面に結像して
カラープリントを得る光シヤツター装置が提案されてい
る。カラーフィルターは液晶シャッターセルのガラス基
板にゼラチンの薄膜を形成した後、赤、緑、青色の染料
で独立に染色して形成している。
As one of the methods to meet the above requirements, as shown in FIG. The intensity of the light from the light source 17 is controlled independently for red, green, and blue by a liquid crystal shutter cell 18 in which a plurality of liquid crystal pixels having a blue color filter B and a plurality of liquid crystal pixels for controlling blue color transmittance are arranged. A light shutter device has been proposed in which controlled light is imaged onto the surface of a photosensitive member 20 by an imaging optical system 19 to obtain a color print. Color filters are made by forming a thin film of gelatin on the glass substrate of the liquid crystal shutter cell, and then dyeing it independently with red, green, and blue dyes.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、ゼラチンカラーフィルターにて色分解す
る従来の方法では、カラープリント出力の色純度が低く
、表現可能な色の範囲が狭い欠点がある。ゼラチンカラ
ーフィルターの透過スペクトルは第7図に示すように透
過スペクトルの幅が広(、赤色を透過するカラーフィル
ターの透過スペクトル21と緑色を透過するカラーフィ
ルターの透過スペクトル22と青色を透過するカラーフ
ィルターの透過スペクトル23が互いに重なり部分を有
する。たとえば、赤色のカラーフィルターを透過した光
は緑色の領域にも光エネルギーを有する。
However, the conventional method of color separation using gelatin color filters has the disadvantage that the color purity of the color print output is low and the range of colors that can be expressed is narrow. The transmission spectrum of the gelatin color filter has a wide transmission spectrum as shown in Figure 7 (transmission spectrum 21 of the color filter that transmits red, transmission spectrum 22 of the color filter that transmits green, and color filter that transmits blue). The transmission spectra 23 of the two have an overlapping portion.For example, light transmitted through a red color filter also has optical energy in the green region.

書き込み光の波長の重なり部分が、光書き込み時のクロ
ストークとなり、カラープリント出力の色純度が低下し
カラープリント出力の画像品質を著しく低下させる。
The overlapping wavelength portion of the writing light causes crosstalk during optical writing, which reduces the color purity of the color print output and significantly reduces the image quality of the color print output.

この点を改良するため、ゼラチンカラーフィルターの代
わりに、光透過帯域がゼラチン方式より狭い干渉フィル
ターを用いる方法も考えられる。
In order to improve this point, it is possible to use an interference filter whose light transmission band is narrower than that of the gelatin method instead of the gelatin color filter.

ところで、干渉フィルターは、薄膜を多数積層して形成
するが、透過スペクトルの中心波長は薄膜の厚さで決定
されるので、光シヤツター素子、表示素子のように広い
範囲に干渉フィルターを形成すると、多層薄膜の膜厚が
場所により不均一になるので、透過スペクトルの中心波
長が場所により異なり、感光部材を露光する光の色が場
所毎に変化し、色情報が正しく感光部材に光書き込みで
きない問題が生じる。
By the way, interference filters are formed by laminating a large number of thin films, but since the center wavelength of the transmission spectrum is determined by the thickness of the thin films, when an interference filter is formed over a wide range such as in an optical shutter element or display element, Since the thickness of the multilayer thin film is uneven depending on the location, the center wavelength of the transmission spectrum differs depending on the location, and the color of the light that exposes the photosensitive material changes from location to location, causing the problem that color information cannot be written correctly onto the photosensitive material. occurs.

本発明は、カラープリントにおいては、色純度の高い、
プリント色範囲が広い高品質のカラープリント出力を得
る光書き込みができ、カラー表示においても仏画面にわ
たり色純度の高い表示画面が得られる光変調装置を提供
することを目的とする。
The present invention has high color purity in color printing.
It is an object of the present invention to provide a light modulation device capable of optical writing to obtain a high-quality color print output with a wide print color range, and also capable of obtaining a display screen with high color purity over a full screen even in color display.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、本発明の光変調装置は、光
源と、該光源からの光を複数のスペクトルに分光するカ
ラーフィルターを有する光変調素子とを備えた光変調装
置において、前記光源と前記光変調素子を結ぶ光路上に
、前記カラーフィルターより各スペクトルの波長帯竣を
狭く分光する波長選択部材を設置したことを特徴として
いる。
In order to achieve the above object, a light modulation device of the present invention includes a light source and a light modulation element having a color filter that separates light from the light source into a plurality of spectra. The present invention is characterized in that a wavelength selection member is installed on the optical path connecting the light modulation elements to narrowly separate the end of each wavelength band from the color filter.

〔実施例〕〔Example〕

以下本発明の実施例を図面を用いて詳述する。 Embodiments of the present invention will be described in detail below with reference to the drawings.

実施例1 第1図に本発明に基づ(光変調装置の一例である液晶シ
ャッターヘッドの構成を示す。光源であるハロゲンラン
プ1の光を複屈折板を2枚の偏光板ではさんだ波長選択
部材2で選択的に透過し、導光部材乙に導光して線状光
源にする。光変調素子である液晶シャッターセル4は、
この線状光源からの光を分光透過する。すなわち、赤色
を選択的に透過するゼラチンカラーフィルターを有し、
赤色の透過率を制御する赤色液晶画素、緑色を選択的に
透過するゼラチンカラーフィルターを有し、緑色の透過
率を制御する緑色液晶画素、青色を選択的に透過するゼ
ラチンカラーフィルターを有し、青色の透過率を制御す
る青色液晶画素で各色の光を独立に制御する。液晶シャ
ッターセル4から出射した光は結像光学系5で感光部材
Pの表面に結像され、感光部材Pに光書き込みをする。
Example 1 Figure 1 shows the configuration of a liquid crystal shutter head, which is an example of a light modulation device, based on the present invention. Wavelength selection is performed by sandwiching the light from a halogen lamp 1, which is a light source, between a birefringent plate and two polarizing plates. The light is selectively transmitted through the member 2 and guided to the light guide member B to form a linear light source.The liquid crystal shutter cell 4, which is a light modulation element,
The light from this linear light source is transmitted spectrally. That is, it has a gelatin color filter that selectively transmits red color,
It has a red liquid crystal pixel that controls the transmittance of red color, a gelatin color filter that selectively transmits green color, a green liquid crystal pixel that controls the transmittance of green color, and a gelatin color filter that selectively transmits blue color; Each color of light is controlled independently using blue liquid crystal pixels that control blue transmittance. The light emitted from the liquid crystal shutter cell 4 is imaged on the surface of the photosensitive member P by the imaging optical system 5, and optical writing is performed on the photosensitive member P.

波長選択部材2は2枚の偏光方向が直交する偏光板の間
に複屈折フィルムを挾み、複屈折フィルムの光学主軸と
偏光板の軸を45度ずらして配置した。波長選択部材2
の液晶シャッターセル4の側に配置された偏光板の軸は
、液晶シャッタ−セル40波長選択部材2の側に配置さ
れた偏光板の軸と一致させ、光エネルギーの損失を防止
する。
In the wavelength selection member 2, a birefringent film was sandwiched between two polarizing plates whose polarization directions were orthogonal to each other, and the optical principal axis of the birefringent film and the axis of the polarizing plate were shifted by 45 degrees. Wavelength selection member 2
The axis of the polarizing plate disposed on the side of the liquid crystal shutter cell 4 is made to coincide with the axis of the polarizing plate disposed on the side of the wavelength selection member 2 of the liquid crystal shutter cell 40 to prevent loss of optical energy.

複屈折フィルムは(屈折率の異方性×厚さ)が3000
nmのポリカーボネイト製のフィルムを用いた。第2図
に2枚の偏光板に挾まれた複屈折フィルムを透過した光
のスペクトルを示す。赤色、緑色、青色に相当するスペ
クトル6R16G、6Bは第7図の21.22.26に
示すゼラチンカラーフィルターの透過スペクトルより波
長帯域が狭い。液晶シャッターセル4を出射する光は、
ゼラチンカラーフィルターのスペクトルと波長選択部材
2のスペクトルのかげ算であり、第3図の赤色7、緑色
8、青色9に示すように、ゼラチンカラーフィルターだ
けで波長を選択した従来装置よりも波長帯域が狭く各色
の波長の重なり部分が無い。したがって、書き込み光の
クロストークが非常に小さく、プリント出力される画像
は色純度が高い。
Birefringent film has (refractive index anisotropy x thickness) 3000
A film made of polycarbonate of 50 nm was used. Figure 2 shows the spectrum of light transmitted through a birefringent film sandwiched between two polarizing plates. Spectra 6R16G and 6B corresponding to red, green, and blue have a narrower wavelength band than the transmission spectrum of the gelatin color filter shown at 21, 22, and 26 in FIG. The light emitted from the liquid crystal shutter cell 4 is
This is the multiplication of the spectrum of the gelatin color filter and the spectrum of the wavelength selection member 2, and as shown in red 7, green 8, and blue 9 in Figure 3, the wavelength band is greater than that of the conventional device that selects wavelengths using only the gelatin color filter. is narrow and there is no overlap between the wavelengths of each color. Therefore, the crosstalk of the writing light is extremely small, and the printed image has high color purity.

なお、波長選択部材2は、第1図の光源1と導光部材乙
の間に配置する他に、導光部材3と液晶シャッターセル
40間、液晶シャッターセル4と結像光学系50間、結
像光学系5と感光部材Pの間に配置しても同様の効果を
有する。
In addition, the wavelength selection member 2 is arranged between the light source 1 and the light guide member B in FIG. A similar effect can be obtained even if it is placed between the imaging optical system 5 and the photosensitive member P.

実施例2 波長選択部材の他の構成を第4図に示す。波長選択部材
10は赤色を透過する干渉フィルター11、緑色を透過
する干渉フィルター12、青色を透過する干渉フィルタ
ー16を同一基板上に面積的に分割して形成した。干渉
フィルターは、SiO2薄膜とTi2O3薄膜を交互に
積層した構造である。薄膜の厚みを変えることで透過色
を設計できる。各色の干渉フィルターを透過した光のス
ペクトルを第5図に、赤色14、緑色15、青色16で
示す。本実施例の波長選択部材10を第1図の波長選択
部材2の代わりに配置すれば、実施例1と同様に液晶シ
ャッターセルの各画素を透過した光のスペクトルは、第
7図のゼラチンフィルターの透過スペクトルと第5図の
干渉フィルターの透過スペクトルの積となる。
Example 2 Another configuration of the wavelength selection member is shown in FIG. 4. The wavelength selection member 10 is formed by dividing an interference filter 11 that transmits red light, an interference filter 12 that transmits green light, and an interference filter 16 that transmits blue light on the same substrate. The interference filter has a structure in which SiO2 thin films and Ti2O3 thin films are alternately laminated. Transparent colors can be designed by changing the thickness of the thin film. The spectra of the light transmitted through the interference filters of each color are shown in FIG. 5 as red 14, green 15, and blue 16. If the wavelength selection member 10 of this embodiment is placed in place of the wavelength selection member 2 of FIG. 1, the spectrum of the light transmitted through each pixel of the liquid crystal shutter cell will be changed to is the product of the transmission spectrum of the interference filter shown in FIG.

ここで、干渉フィルターを透過した光に含まれるスペク
トル成分の波長帯域は、ゼラチンフィルターのみを透過
した光に含まれるスペクトルの波長帯域に比較してかな
り狭いので、両者を透過した光のスペクトルの波長帯域
は干渉フィルターの透過波長帯域でほぼ決定される。
Here, the wavelength band of the spectral component included in the light that has passed through the interference filter is considerably narrower than the wavelength band of the spectrum included in the light that has passed only through the gelatin filter, so the wavelength band of the spectrum of the light that has passed through both The band is approximately determined by the transmission wavelength band of the interference filter.

このようにゼラチンカラーフィルターだけで波長を選択
した従来よりも各スペクトル成分の波長帯域が狭く各色
の波長の重なり部分が無いスペクトル構成の光が得られ
る。
In this way, light with a spectral configuration in which the wavelength band of each spectral component is narrower and there is no overlap between the wavelengths of each color can be obtained than in the conventional method in which wavelengths are selected using only gelatin color filters.

各色の干渉フィルターが占める面積の比を変えることで
、ハロゲンランプの発光エネルギーの波長特性と、感光
部材の感度の波長特性を補正することができる。本実施
例では、青色の干渉フィルターが占める面積を最大に、
赤色の面積を最小に、緑色の面積が中間となるよう各色
の面積を設定した。
By changing the ratio of the areas occupied by the interference filters of each color, it is possible to correct the wavelength characteristics of the emission energy of the halogen lamp and the wavelength characteristics of the sensitivity of the photosensitive member. In this example, the area occupied by the blue interference filter is maximized,
The area of each color was set so that the area of red was the minimum and the area of green was in the middle.

なお、本発明の波長選択部材を用いる構成は、感光部材
への光書き込みをする光変調装置の他に、デイスプレー
パネルとしての光変調器にも有効である。
Note that the configuration using the wavelength selection member of the present invention is effective not only for a light modulator for optically writing onto a photosensitive member but also for a light modulator as a display panel.

〔発明の効果〕〔Effect of the invention〕

以上の説明で明らかなように、本発明による光シヤツタ
ー装置、画像表示装置等の光変調装置はゼラチンカラー
フィルターだゆで波長を選択した従来装置よりも、波長
幅が狭く各色の波長の重なり部分が無いことにより、書
き込み光又は表示光のクロストークが非常に小さいので
、色純度の高い、プリント色範囲が広い高品質のカラー
プリント又は表示出力を得ることが可能となる。
As is clear from the above explanation, the light modulation device such as an optical shutter device or an image display device according to the present invention has a narrower wavelength width than the conventional device in which the wavelength is selected using a gelatin color filter, and the overlapping portion of the wavelengths of each color is narrower. Because there is no crosstalk between writing light or display light, it is possible to obtain high-quality color prints or display outputs with high color purity and a wide print color range.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に基づく光変調装置の構成を示す図、第
2図は複屈折部材を用いた波長選択部材の透過スペクト
ルを示す図、第3図は感光部材に照射される光のスペク
トルを示す図、第4図は干渉フィルターを用いた波長選
択部材の構成を示す図、第5図は干渉フィルターの透過
スペクトルの図、第6図は従来の光シヤツター装置の構
成を示す図、第7図はゼラチンカラーフィルターの透過
スペクトルを示す図である。 1・・・・・・光源、 2.10・・・・・・波長選択部材、 4・・・・・・液晶シャッターセル。 P 第2F4 液長 第3図 第4図 第5図 CJO 00 00 700(nm) 液長
Fig. 1 is a diagram showing the configuration of a light modulation device based on the present invention, Fig. 2 is a diagram showing a transmission spectrum of a wavelength selection member using a birefringent member, and Fig. 3 is a diagram showing the spectrum of light irradiated onto a photosensitive member. 4 is a diagram showing the configuration of a wavelength selection member using an interference filter. FIG. 5 is a diagram showing the transmission spectrum of the interference filter. FIG. 6 is a diagram showing the configuration of a conventional optical shutter device. FIG. 7 is a diagram showing the transmission spectrum of a gelatin color filter. 1... Light source, 2.10... Wavelength selection member, 4... Liquid crystal shutter cell. P 2F4 Liquid length Figure 3 Figure 4 Figure 5 CJO 00 00 700 (nm) Liquid length

Claims (3)

【特許請求の範囲】[Claims] (1)光源と、該光源からの光を複数のスペクトルに分
光するカラーフィルターを有する光変調素子とを備えた
光変調装置において、前記光源と前記光変調素子を結ぶ
光路上に、前記カラーフィルターより各スペクトルの波
長帯域を狭く分光する波長選択部材を設置したことを特
徴とする光変調装置。
(1) In a light modulation device including a light source and a light modulation element having a color filter that separates light from the light source into a plurality of spectra, the color filter is placed on an optical path connecting the light source and the light modulation element. A light modulation device characterized in that a wavelength selection member that narrows the wavelength band of each spectrum is installed.
(2)波長選択部材は2枚の偏光板の間に複屈折部材を
挾持して構成されていることを特徴とする請求項1記載
の光変調装置。
(2) The light modulation device according to claim 1, wherein the wavelength selection member is constructed by sandwiching a birefringent member between two polarizing plates.
(3)波長選択部材は各スペクトル成分に対応した干渉
フィルターを2次元的に配置して構成されていることを
特徴とする請求項1記載の光変調装置。
(3) The light modulation device according to claim 1, wherein the wavelength selection member is configured by two-dimensionally arranging interference filters corresponding to each spectral component.
JP2099245A 1990-04-17 1990-04-17 Optical modulating device Pending JPH03296720A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2099245A JPH03296720A (en) 1990-04-17 1990-04-17 Optical modulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2099245A JPH03296720A (en) 1990-04-17 1990-04-17 Optical modulating device

Publications (1)

Publication Number Publication Date
JPH03296720A true JPH03296720A (en) 1991-12-27

Family

ID=14242315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2099245A Pending JPH03296720A (en) 1990-04-17 1990-04-17 Optical modulating device

Country Status (1)

Country Link
JP (1) JPH03296720A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001031395A1 (en) * 1999-10-26 2001-05-03 Matsushita Electric Industrial Co., Ltd. Liquid crystal display and method for manufacturing the same, and method for driving liquid crystal display
US6236799B1 (en) 1998-06-03 2001-05-22 Iljin Corp. Flat-panel display device using optical waveguide
JP2002236289A (en) * 2001-02-09 2002-08-23 Hitachi Ltd Liquid crystal display device
US7057684B2 (en) 2000-10-17 2006-06-06 Matsushita Electric Industrial Co., Ltd. Liquid crystal display with varying thickness
JP2011076109A (en) * 2004-09-27 2011-04-14 Qualcomm Mems Technologies Inc Color filter for manipulating color in display
US8848294B2 (en) 2010-05-20 2014-09-30 Qualcomm Mems Technologies, Inc. Method and structure capable of changing color saturation

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236799B1 (en) 1998-06-03 2001-05-22 Iljin Corp. Flat-panel display device using optical waveguide
KR100301936B1 (en) * 1998-06-03 2001-09-06 황기연 Flat panel display using optical waveguide
WO2001031395A1 (en) * 1999-10-26 2001-05-03 Matsushita Electric Industrial Co., Ltd. Liquid crystal display and method for manufacturing the same, and method for driving liquid crystal display
US7057684B2 (en) 2000-10-17 2006-06-06 Matsushita Electric Industrial Co., Ltd. Liquid crystal display with varying thickness
JP2002236289A (en) * 2001-02-09 2002-08-23 Hitachi Ltd Liquid crystal display device
US6646699B2 (en) * 2001-02-09 2003-11-11 Hitachi, Ltd. Liquid crystal display with band-pass filter
JP2011076109A (en) * 2004-09-27 2011-04-14 Qualcomm Mems Technologies Inc Color filter for manipulating color in display
US8848294B2 (en) 2010-05-20 2014-09-30 Qualcomm Mems Technologies, Inc. Method and structure capable of changing color saturation

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