JPH04163529A - Optical phase modulator - Google Patents
Optical phase modulatorInfo
- Publication number
- JPH04163529A JPH04163529A JP29124590A JP29124590A JPH04163529A JP H04163529 A JPH04163529 A JP H04163529A JP 29124590 A JP29124590 A JP 29124590A JP 29124590 A JP29124590 A JP 29124590A JP H04163529 A JPH04163529 A JP H04163529A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- spatial light
- light modulator
- crystal spatial
- phase
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 58
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- 230000010365 information processing Effects 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液晶空間光変調器を利用した光学的情報処理
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical information processing device using a liquid crystal spatial light modulator.
［従来の技術〕
従来の液晶空間光変調器では、液晶パネルの厚さの不均
一にもとづく位相ひずみを補償するために、液晶パネル
の両側へ高精度な平行基板を接着していた（例えば、Ａ
ｐｐｌｉｅｄ ０ｐｔｉｃｓ Ｖｏｌ、２５．〜０．９
（１９８Ｂ） １３８０参照）。液晶空間光変調器の断
面を図５に示す。[Prior Art] In conventional liquid crystal spatial light modulators, high-precision parallel substrates are bonded to both sides of the liquid crystal panel in order to compensate for phase distortion caused by non-uniform thickness of the liquid crystal panel (for example, A
pplied 0ptics Vol, 25. ~0.9
(198B) 1380). A cross section of the liquid crystal spatial light modulator is shown in FIG.
しかしながら、従来のやり方では、光学的位相変調装置
として各種の情報処理に使えるまでに液晶空間光変調器
の光学的品質を向上させることは困難であった。また、
前記の接着工程は人手に頼るため品質のばらつきか大き
い、必要な平行基板か高価であるなどの欠点をかかえて
いた。However, with conventional methods, it has been difficult to improve the optical quality of the liquid crystal spatial light modulator to the point where it can be used as an optical phase modulator for various information processing. Also,
The above-mentioned bonding process relies on manual labor and has drawbacks such as large variations in quality and the need for parallel substrates, which are expensive.
本発明はこのような問題点を解決するものであって、そ
の目的は簡便な手段により光学的品質の優れた液晶空間
光変調器を提供するところにある。The present invention is intended to solve these problems, and its purpose is to provide a liquid crystal spatial light modulator with excellent optical quality using simple means.
本発明の第１の光学的位相変調装置は、ＥＣＢモードの
アクティブマトリクス型液晶空間光変調器と、該液晶空
間光変調器へ位相分布を記録するための信号発生器とか
ら成ることを特徴とする。A first optical phase modulation device of the present invention is characterized by comprising an ECB mode active matrix liquid crystal spatial light modulator and a signal generator for recording a phase distribution on the liquid crystal spatial light modulator. do.
本発明の第２の光学的位相変調装置は、前記第１の光学
的位相変調装置において、信号発生器か、少なくとも、
中央演算処理回路（ＣＰＵ）と、ふたつのメモリ回路と
、該ふたつのメモリ回路のそれぞれからの信号を足し合
わせる加算回路と、該加算回路からの信号を液晶空間光
変調器へ転送するためのインターフェース回路とを備え
ていることを特徴とする。A second optical phase modulation device of the present invention includes a signal generator or at least a signal generator in the first optical phase modulation device.
A central processing circuit (CPU), two memory circuits, an addition circuit that adds signals from each of the two memory circuits, and an interface for transferring the signal from the addition circuit to the liquid crystal spatial light modulator. It is characterized by comprising a circuit.
本発明の第３の光学的位相変調装置は、前記第１または
第２の光学的位相変調装置において、ふたつのメモリ回
路の一方には、位相分布に相当する信号データを、もう
一方（：′は、液晶空間光変調器の各画素の位相ひずみ
量を補償する信号データを記憶しておくことを特徴とす
る。A third optical phase modulation device of the present invention is such that, in the first or second optical phase modulation device, one of the two memory circuits stores signal data corresponding to the phase distribution in the other (:' is characterized in that signal data for compensating the amount of phase distortion of each pixel of the liquid crystal spatial light modulator is stored.
以下では実施例にもとつき、本発明の内容について詳し
く説明する。The contents of the present invention will be explained in detail below based on examples.
第１図は、本発明の光学的位相変調装置の構成を示すブ
ロック図である。この装置は、たとえば位相型計算機ホ
ログラムを液晶空間光変調器１０６へ記録して、はぼ実
時間でレーザビーム波面を制御するために使うことがで
きる。他にも、画像を濃淡分布ではなく位相分布として
液晶空間光変調器１０６へ入力し、各種の光情報処理へ
役立てることかできる。FIG. 1 is a block diagram showing the configuration of an optical phase modulation device of the present invention. This device can be used, for example, to record a phase-type computer-generated hologram on the liquid crystal spatial light modulator 106 and to control the laser beam wavefront in almost real time. In addition, the image can be input to the liquid crystal spatial light modulator 106 as a phase distribution instead of a grayscale distribution, and can be used for various optical information processing.
上記のように液晶空間光変調器を光学的位相変調に用い
る場合の最大の問題は、液晶空間光変調器の液晶層の厚
さの不均一による生じる光学的位相ひずみである。第５
図に示す従来のやり方では、この位相ひずみを充分に補
償することが困難であった。これに対して、本発明では
、液晶空間光変調器へ新たに部材を付加することなく、
液晶空間光変調への信号人力方法を工夫するたけて位相
ひずみの補償を実現する。The biggest problem when using a liquid crystal spatial light modulator for optical phase modulation as described above is optical phase distortion caused by non-uniform thickness of the liquid crystal layer of the liquid crystal spatial light modulator. Fifth
In the conventional method shown in the figure, it is difficult to sufficiently compensate for this phase distortion. In contrast, in the present invention, without adding any new members to the liquid crystal spatial light modulator,
Compensation of phase distortion will be realized by devising a signal input method for liquid crystal spatial light modulation.
本発明の光学的位相変調装置の主構成要素である液晶空
間光変調器２０１の概観の模式図を第２図（ａ）に示す
。この液晶空間光変調器は、各画素にｐｏｌｙ−３ｉＴ
ＦＴをアクティブ素子として備え、低クロストーク、階
調性を特徴とする。FIG. 2(a) shows a schematic diagram of a liquid crystal spatial light modulator 201, which is the main component of the optical phase modulation device of the present invention. This liquid crystal spatial light modulator uses poly-3iT for each pixel.
Equipped with FT as an active element, it features low crosstalk and gradation.
１９ Ｘ ］、 ３順の表示部分２０２に、水平方向３
２０、垂直方向２２０の画素数をもつ。画素配列の模式
図を第２図（ｂ）に示す。ＴＰＴおよびその他の回路素
子は、画素２１１と画素の間に設けられたしゃ光マスク
２１２の下に配置され、光照射による誤動作が生しない
ように工夫されている。19
20, and 220 pixels in the vertical direction. A schematic diagram of the pixel arrangement is shown in FIG. 2(b). The TPT and other circuit elements are arranged under a light-shielding mask 212 provided between the pixels 211 to prevent malfunctions caused by light irradiation.
この液晶空間光変調器は、Ｅ ＣＢ （Ｅｌｅｃｔｒｉ
ｃａｌｌｙＣｏｎｔｒｏｌｌｅｄ Ｂｉｒｅｆｒｉｎｇ
ｅｎｃｅ ）モードの液晶パネルと、このパネルに対し
てレーザ光が入射する側に配置された１枚の偏光板とか
ら成る。液晶パネルにおける液晶分子の初期配向は、パ
ネル基板に対して水平である。また、偏光板の透過軸は
、パネル基板法線と液晶分子長軸か作る平面内にある。This liquid crystal spatial light modulator is an E CB (Electri
CallyControlled Birefring
ence ) mode liquid crystal panel and one polarizing plate placed on the side of the panel into which laser light is incident. The initial orientation of liquid crystal molecules in a liquid crystal panel is horizontal to the panel substrate. Furthermore, the transmission axis of the polarizing plate is within a plane formed by the normal line of the panel substrate and the long axis of the liquid crystal molecules.
第３図に、ＥＣＢモードの液晶空間光変調器から得られ
た、位相変化と印加電圧を示す。光学的位相変調に用い
るのであれば、２πの位相変化か得れれれば充分である
か、本発明では、液晶パネルの位相ひずみを補償するこ
とを目的に、４πまての位相変化が得られるように配慮
して液晶パネルを作製した。なお、第３図の電圧範囲に
おいて、液晶空間光変調器から出射するレーザビームは
入射する時と同し直線偏光であり、その振幅強度は印加
電圧によらず一定である。FIG. 3 shows the phase change and applied voltage obtained from the ECB mode liquid crystal spatial light modulator. If it is used for optical phase modulation, is it sufficient to obtain a phase change of 2π? In the present invention, a phase change of up to 4π can be obtained for the purpose of compensating for the phase distortion of a liquid crystal panel. The liquid crystal panel was manufactured with these considerations in mind. Note that, in the voltage range shown in FIG. 3, the laser beam emitted from the liquid crystal spatial light modulator is linearly polarized light as it is when it enters, and its amplitude intensity is constant regardless of the applied voltage.
本発明の第１の特徴は、ここまでに述べてきたように、
位相変化が２πよりも大きくとれるＥＣＢモードのアク
ティブマトリクス型液晶空間光変調器を用いた点にある
。As stated above, the first feature of the present invention is that
The point is that an ECB mode active matrix type liquid crystal spatial light modulator is used, which allows the phase change to be larger than 2π.
第１図へもどって、液晶空間光変調器１０６へ入力すべ
き信号はふたつある。ひとつは、所定の位相分布に相当
する信号であり、もうひとつは、液晶空間光変調器１０
６の位相ひすみ量を補償する信号である。これらの信号
データは、それぞれ、メモリ回路１０２．１０３に記憶
されている。そして、加算回路１０４て足し合わされた
のち、インターフェース回路１０５を介して、液晶空間
光変調器へ人力される。位相ひすみ量は、あらかしめ液
晶空間光変調器の全ての画素について調べておいて、そ
の位相ひすみ量を打消すのに必要なたけの電圧信号を発
生させるように信号データを作っておく。第４図（ａ）
は、Ｍａｃｈ−Ｚｅｈｎｄｅｒ干渉系を使って得た、液
晶空間光変調器の位相ひずみを表わす干渉縞である。全
ての画素へ等しい電圧信号を入力した。この時の位相ひ
ずみは、最大２分の１波長である。第４図（ｂ）は、こ
の位相ひずみを補償するために、あらかじめ作っておい
た位相ひずみ量に対応する信号データを加えた場合の干
渉縞であり、液晶空間光変調器の表示部分全域で実用上
問題のない程度まで位相ひずみを補償することかできた
。Returning to FIG. 1, there are two signals that should be input to the liquid crystal spatial light modulator 106. One is a signal corresponding to a predetermined phase distribution, and the other is a signal corresponding to the liquid crystal spatial light modulator 10.
This is a signal that compensates for the amount of phase distortion of 6. These signal data are stored in memory circuits 102 and 103, respectively. Then, after being added by the adding circuit 104, the signals are manually inputted to the liquid crystal spatial light modulator via the interface circuit 105. The amount of phase distortion is investigated in advance for all pixels of the liquid crystal spatial light modulator, and signal data is created so as to generate a voltage signal as large as necessary to cancel the amount of phase distortion. Figure 4(a)
are interference fringes representing phase distortion of a liquid crystal spatial light modulator obtained using a Mach-Zehnder interference system. An equal voltage signal was input to all pixels. The phase distortion at this time is a maximum of 1/2 wavelength. Figure 4(b) shows the interference fringes when signal data corresponding to the amount of phase distortion created in advance is added to compensate for this phase distortion, and it shows the interference fringes across the entire display area of the liquid crystal spatial light modulator. We were able to compensate for phase distortion to an extent that poses no practical problems.
本発明の第２の特徴は、あらかしめ調べておいた位相ひ
ずみ量にもとつき、電気回路的手段によりこの位相ひず
みを補償する点にある。A second feature of the present invention is that the phase distortion is compensated for by electric circuit means based on the amount of phase distortion that has been investigated in advance.
以上述べてきたように、本発明の光学的位相変調装置に
よれば、液晶空間光変調器へ新たな部材を付加すること
なく、簡便な電気的手段により、従来問題となっていた
液晶空間光変調器の光学的位相ひずみを除去することか
可能になり、各種の光学的情報処理へ用途が広がる。As described above, according to the optical phase modulation device of the present invention, the liquid crystal spatial light modulator, which has been a problem in the past, can be It becomes possible to remove the optical phase distortion of the modulator, and its applications expand to various optical information processing.
なお、上記実施例では、液晶空間光変調器か備えるべき
アクティブ素子としてｐｏｌｙ−３ｉＴＦＴをとりあげ
たが、アモルファス５ｉＴＦＴであっても不都合はない
。さらに、上記実施例でとりあげた透過型液晶空間光変
調器に代えて、反射型液晶空間光変調器であっても良い
。In the above embodiment, a poly-3i TFT was used as an active element to be included in a liquid crystal spatial light modulator, but an amorphous 5i TFT may be used without any disadvantage. Furthermore, instead of the transmissive liquid crystal spatial light modulator used in the above embodiments, a reflective liquid crystal spatial light modulator may be used.
本発明によれば、従来よりも簡便な手段により、実用性
の高い光学的位相変調装置を実現できる。According to the present invention, a highly practical optical phase modulation device can be realized using simpler means than conventional methods.
本発明の光学的位相変調装置は、プログラム可能なホロ
クラム、光学的相関フィルタをはしめ多くの光学的情報
処理に応用することができる。The optical phase modulation device of the present invention has a programmable hologram and an optical correlation filter, and can be applied to many optical information processing applications.
第１図は、本発明の光学的位相変調装置の構成を示すブ
ロック図。
第２図（ａ）は、本発明の液晶空間光変調器の外観を示
す平面図。
第２図（ｂ）は、本発明の液晶空間光変調器の画素配列
を示す平面図。
第３図は、本発明の液晶空間光変調器の位相変調特性を
説明するための図。
第４図（ａ）は、位相ひずみを補償する前の状態を説明
するための図。
第４図（ｂ）は、位相ひずみを補償した後の状態を説明
するための図。
第５図は、従来の液晶空間光変調器の構造を示す断面図
。
］０１・・・ＣＰＵ
１０２・・・メモリ回路
１０３・・・メモリ回路
１０４・・・加算回路
１０５・・・インターフェース回路
１０６・・・液晶空間光変調器
１０７・・・光学系
２０１・・・液晶空間光変調器
２０２・・・表示部分
２１］・・・画素
２１２・・・しゃ光マスク
４０１・・・干渉縞
５０１・・・液晶綿
５０２・・・電極基板
５０３・・・接着剤
５０４・・・平行基板
以上
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴 木 喜三部（他１名）第１図
２ｏ１：、鶴フ間光・を縄外
２０２、ｂ蓋梵労
第２図弘）
第２図（′））
４０１−−−千メ４高
第４図（ａ）
第４図（ｂ）FIG. 1 is a block diagram showing the configuration of an optical phase modulation device of the present invention. FIG. 2(a) is a plan view showing the appearance of the liquid crystal spatial light modulator of the present invention. FIG. 2(b) is a plan view showing the pixel arrangement of the liquid crystal spatial light modulator of the present invention. FIG. 3 is a diagram for explaining the phase modulation characteristics of the liquid crystal spatial light modulator of the present invention. FIG. 4(a) is a diagram for explaining the state before compensating for phase distortion. FIG. 4(b) is a diagram for explaining the state after compensating for phase distortion. FIG. 5 is a cross-sectional view showing the structure of a conventional liquid crystal spatial light modulator. ]01...CPU 102...Memory circuit 103...Memory circuit 104...Addition circuit 105...Interface circuit 106...Liquid crystal spatial light modulator 107...Optical system 201...Liquid crystal Spatial light modulator 202... display portion 21]... pixels 212... light shielding mask 401... interference fringes 501... liquid crystal cotton 502... electrode substrate 503... adhesive 504...・Parallel substrates and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (and 1 other person) Figure 1 2o1:, Tsurufuma Hikaru, 202 outside the rope, b Cover Bonro Figure 2 Hiro) No. Figure 2 (')) 401 --- Senme 4th High Figure 4 (a) Figure 4 (b)
Claims (3)
に関し、ＥＣＢモードで動作するアクティブマトリクス
型液晶空間光変調器と、該液晶空間光変調器へ位相分布
を記録するための信号発生器とから成ることを特徴とす
る光学的位相変調装置。(1) Regarding an optical phase modulation device using a liquid crystal spatial light modulator, an active matrix liquid crystal spatial light modulator that operates in ECB mode and a signal generator for recording phase distribution on the liquid crystal spatial light modulator An optical phase modulation device comprising:
路（ＣＰＵ）と、ふたつのメモリ回路と、該ふたつのメ
モリ回路のそれぞれからの信号を足し合わせる加算回路
と、該加算回路からの信号を前記液晶空間光変調器へ転
送するためのインターフェース回路とを備えていること
を特徴とする請求項１記載の光学的位相変調装置。(2) The signal generator includes at least a central processing circuit (CPU), two memory circuits, an adder circuit that adds signals from each of the two memory circuits, and a signal generator that adds signals from the adder circuit. 2. The optical phase modulation device according to claim 1, further comprising an interface circuit for transferring to said liquid crystal spatial light modulator.
布に相当する信号データを、もう一方には、前記液晶空
間光変調器の各画素の位相ひずみ量を補償する信号デー
タを記憶しておくことを特徴とする請求項１または請求
項２に記載の光学的位相変調装置。(3) One of the two memory circuits stores signal data corresponding to the phase distribution, and the other stores signal data that compensates for the amount of phase distortion of each pixel of the liquid crystal spatial light modulator. The optical phase modulation device according to claim 1 or 2, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29124590A JPH04163529A (en) | 1990-10-29 | 1990-10-29 | Optical phase modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29124590A JPH04163529A (en) | 1990-10-29 | 1990-10-29 | Optical phase modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04163529A true JPH04163529A (en) | 1992-06-09 |
Family
ID=17766364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29124590A Pending JPH04163529A (en) | 1990-10-29 | 1990-10-29 | Optical phase modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04163529A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010152094A (en) * | 2008-12-25 | 2010-07-08 | Hamamatsu Photonics Kk | Device and method for controlling light |
| JP2010151948A (en) * | 2008-12-24 | 2010-07-08 | Hamamatsu Photonics Kk | Device and method for controlling light |
| JP5167274B2 (en) * | 2007-12-05 | 2013-03-21 | 浜松ホトニクス株式会社 | Phase modulation apparatus and phase modulation method |
-
1990
- 1990-10-29 JP JP29124590A patent/JPH04163529A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5167274B2 (en) * | 2007-12-05 | 2013-03-21 | 浜松ホトニクス株式会社 | Phase modulation apparatus and phase modulation method |
| US8576206B2 (en) | 2007-12-05 | 2013-11-05 | Hamamatsu Photonics K.K. | Phase modulating apparatus and phase modulating method |
| US9007286B2 (en) | 2007-12-05 | 2015-04-14 | Hamamatsu Photonics K.K. | Phase modulating apparatus and phase modulating method |
| JP2010151948A (en) * | 2008-12-24 | 2010-07-08 | Hamamatsu Photonics Kk | Device and method for controlling light |
| US8610993B2 (en) | 2008-12-24 | 2013-12-17 | Hamamatsu Photonics K.K. | Light control device and light control method |
| JP2010152094A (en) * | 2008-12-25 | 2010-07-08 | Hamamatsu Photonics Kk | Device and method for controlling light |
| US8441709B2 (en) | 2008-12-25 | 2013-05-14 | Hamamatsu Photonics K.K. | Light control device and light control method |
| US9001411B2 (en) | 2008-12-25 | 2015-04-07 | Hamamatsu Photonics K.K. | Light control device and light control method |
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