JPH049030A - Projector using liquid crystal - Google Patents
Projector using liquid crystalInfo
- Publication number
- JPH049030A JPH049030A JP11155490A JP11155490A JPH049030A JP H049030 A JPH049030 A JP H049030A JP 11155490 A JP11155490 A JP 11155490A JP 11155490 A JP11155490 A JP 11155490A JP H049030 A JPH049030 A JP H049030A
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarizing
- lcd
- lcd cell
- light source
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 18
- 239000002184 metal Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000007772 electrode material Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 21
- 239000011521 glass Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 3
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、反射式オーバーへラドプロジェクタ−（ＯＨ
Ｐ）などとして用いる投影装置、特に液晶素子（ＬＣＤ
）を用いた投影装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a reflective overheating projector (OH
Projection devices used as P), especially liquid crystal elements (LCD)
).
最近、ＯＨＰに使用する原稿フィルムの代わりにＳＴＮ
またはＴＦＴタイプのＬＣＤを用い、それにコンピュー
ター情報を表示してスクリーンに写し出す装置が実用化
されている。Recently, STN has been used instead of original film used for OHP.
Alternatively, a device that uses a TFT type LCD and displays computer information on the screen has been put into practical use.
これは、例えば第６図に示すようにＯＨＰの光源２１の
発光光線をフレネルレンズ２２で集光し、そのＬＣＩ）
２３の透過像をレンズ２４により結像させ、ミラー２５
の反射によりスクリーン２６−１−に映出するものであ
る。For example, as shown in FIG. 6, the light emitted from the OHP light source 21 is focused by a Fresnel lens 22, and the LCI)
A transmitted image of 23 is formed by a lens 24, and a mirror 25
The image is projected on the screen 26-1- by reflection of the image.
しかし、このような構成では、ｏＨＰ本体が大形で取扱
いに不便であるばかりでなく、ＯＨＰのフレネルレンズ
２２に近接してＬＣＤ２３を設置するために、光源２１
の熱がＬＣＤ２３に直接掛がり、温度り昇に伴ってコン
トラストが低下したり、表示にムラが生じる原因となる
。また、Ｌ］）２３として透過型ＬＣＤを用いるため、
偏光板を２枚使用する必要があり、透過率が低下して映
像が暗くなる。However, in such a configuration, not only is the oHP main body large and inconvenient to handle, but also the light source 21 is installed close to the Fresnel lens 22 of the OHP.
This heat is applied directly to the LCD 23, causing a decrease in contrast and uneven display as the temperature rises. In addition, since a transmissive LCD is used as L]) 23,
It is necessary to use two polarizing plates, which reduces transmittance and darkens the image.
本発明の目的は、小型で、明るい映像を表示できる、液
晶を用いた投影装置を提供することにある。An object of the present invention is to provide a projection device using liquid crystal that is compact and capable of displaying bright images.
本発明は、一方のパターン電極を高反射率の金属膜、他
方のパターン電極を透明電極材料によりそれぞれ形成さ
れたＬＣＤセルと、光源と、投影用レンズと、投影用ス
クリーンと、前記光源からの分散光を平行光線として前
記ＬＣＤセルに入射させ、ＬＣＤセルの金属電極からの
反射光を再び集光して前記投影用レンズに導くように前
記ＬＣＤセルの前面に装着されたフレネルレンズと、光
路上分離されて前記ＬＣＤセルと前記光源、前記投影ス
クリーンとの間に配置された第一、第二の偏光部材とを
備えてなることを特徴とするものである。The present invention includes an LCD cell in which one pattern electrode is formed of a metal film with high reflectance and the other pattern electrode is formed of a transparent electrode material, a light source, a projection lens, a projection screen, and a light source from the light source. a Fresnel lens attached to the front surface of the LCD cell so as to make the dispersed light enter the LCD cell as a parallel beam, refocus the reflected light from the metal electrode of the LCD cell, and guide it to the projection lens; The present invention is characterized by comprising first and second polarizing members separated on the road and arranged between the LCD cell, the light source, and the projection screen.
以下、本発明を図面に示す実施例に基づいて詳細に説明
する。Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
第１図は本発明の一実施例を示すものである。FIG. 1 shows an embodiment of the present invention.
光源１は、ハロゲン電球、メタルハライドランプ、キセ
ノンランプ等の点光源とコールドミラーの組合せとして
いる。The light source 1 is a combination of a point light source such as a halogen bulb, metal halide lamp, or xenon lamp, and a cold mirror.
また、ＬＣＤセルとしては、５ＴＮ（スーパーツイスト
・ネマティック）方式の反射型ＬＣＤセル２を用いてい
る。このＬＣＤセル２は、一対の透明基板、例えばガラ
ス板２Ａ、２Ａ’の一方のガラス板２Ａの内面にＩＴＯ
などにより透明電極２Ｂをストライプ状に形成し、更に
ポリイミド膜をラビングしたり、あるいはＳｉＯの斜方
蒸着を実施するなとして配向膜２Ｃを形成している。他
方のガラス板２Ａ’には高反射の金属膜（Ａ）。Further, as the LCD cell, a 5TN (super twisted nematic) reflective type LCD cell 2 is used. This LCD cell 2 includes a pair of transparent substrates, for example, one of the glass plates 2A and 2A' has ITO on its inner surface.
Transparent electrodes 2B are formed in stripes by the above method, and alignment films 2C are formed without rubbing the polyimide film or performing oblique evaporation of SiO. The other glass plate 2A' has a highly reflective metal film (A).
Ｃｒ＋Ｍｏ等）によりストライプ状の電極２Ｂ’を形成
し、更に配向膜２Ｃ’を形成している。A striped electrode 2B' is formed using Cr+Mo, etc.), and an alignment film 2C' is further formed.
対のガラス板２Ａ、２Ａ’は、第２図、第３図に示すよ
うに電極パターンが直交するように対向させており、そ
の間に液晶層２Ｄを形成している。As shown in FIGS. 2 and 3, the pair of glass plates 2A and 2A' are opposed to each other so that their electrode patterns are perpendicular to each other, and a liquid crystal layer 2D is formed between them.
液晶層２Ｄは、ネマティック液晶にカイラルネマティッ
クあるいはコステリック液晶を僅かに添加して、液晶の
グイレフターの方向がＬＣＤセル内で１８０°〜２７０
°回転するようにしている。The liquid crystal layer 2D is made by adding a small amount of chiral nematic or costelic liquid crystal to the nematic liquid crystal so that the direction of the gylefter of the liquid crystal is 180° to 270° within the LCD cell.
° It is designed to rotate.
」１記ＬＣＤセル２の前面（図示上面）には、前記光源
１よりの分散光を再び集光し、投影用レンズ３に導くた
めのフレネルレンズ４を装着し、投影用レンズ３とスク
リーン５の間には投影用ミラー６を配置している。前記
光源工とＬＣＤセル２の間には、ＬＣＤをライトバルブ
とするための第一の偏光部材である偏光反射板７を、光
源１の光が反射してＬＣＤセル２に導かれるよう、斜め
方向に傾けて配置している。この偏光反射板７は、光が
この表面で反射した時偏光する特性を有するものであっ
て、マルチコーティングミラーなどを用いる。また、前
記ＬＣＤセル２とスクリーン５の間には、ＬＣＤをライ
トバルブとするための第二の偏光板８を配置している。1. A Fresnel lens 4 is attached to the front surface (upper surface in the drawing) of the LCD cell 2 for refocusing the dispersed light from the light source 1 and guiding it to the projection lens 3. A projection mirror 6 is placed between them. Between the light source and the LCD cell 2, a polarizing reflector 7, which is a first polarizing member for using the LCD as a light valve, is installed diagonally so that the light from the light source 1 is reflected and guided to the LCD cell 2. It is placed tilted in the direction. The polarizing reflector 7 has a property of polarizing light when reflected on its surface, and uses a multi-coated mirror or the like. Further, a second polarizing plate 8 is arranged between the LCD cell 2 and the screen 5 to use the LCD as a light valve.
なお、前記偏光反射板７と偏光板８の位置関係は逆であ
っても同じ機能を有する。この逆の構成の場合は、投影
用ミラー６と偏光反射板７とを共用することも可能であ
る。Incidentally, even if the positional relationship between the polarizing reflector plate 7 and the polarizing plate 8 is reversed, they have the same function. In the case of the opposite configuration, it is also possible to share the projection mirror 6 and the polarization reflecting plate 7.
次に、動作について述べる。光源１から発した光は、偏
光反射板７で反射して偏光状態の光となり、フレネルレ
ンズ４によってＬＣＤセル２にほぼ垂直に入射する。こ
の入射光は、ガラス板２Ａを通過して液晶Ｂ２Ｄに進入
する。液晶層２Ｄを通った光は、液晶の屈折率の異方性
のため、楕円偏光となる。この楕円偏光が高反・耐金属
電極２Ｂ’で反射され、もう−度液晶層２Ｄを通る。Next, the operation will be described. The light emitted from the light source 1 is reflected by the polarization reflector 7 to become polarized light, and is incident on the LCD cell 2 almost perpendicularly through the Fresnel lens 4. This incident light passes through the glass plate 2A and enters the liquid crystal B2D. The light passing through the liquid crystal layer 2D becomes elliptically polarized light due to the anisotropy of the refractive index of the liquid crystal. This elliptically polarized light is reflected by the high anti-metallic electrode 2B' and passes through the liquid crystal layer 2D.
液晶層２Ｄの液晶分子は、その誘電率の異方性のため、
電圧印加により分子グイレフターの分布が変化し、それ
に伴って液晶層２Ｄの屈折率の異方性の分布も変化する
。その結果、高反射金属電極２Ａ’に達する光の偏光状
態が変化するので、金属電極２Ａ’で反射し、フレネル
レンズ４を経て偏光板８を通った後の光は、液晶層２Ｄ
への電圧印加の度合いにより光強度魯色調等が変化する
。Due to the anisotropy of the dielectric constant of the liquid crystal molecules in the liquid crystal layer 2D,
Due to the voltage application, the distribution of molecular gylefters changes, and the anisotropy distribution of the refractive index of the liquid crystal layer 2D changes accordingly. As a result, the polarization state of the light that reaches the high-reflection metal electrode 2A' changes, so that the light that has been reflected by the metal electrode 2A', passed through the Fresnel lens 4, and passed through the polarizing plate 8 is reflected by the liquid crystal layer 2D.
The light intensity, color tone, etc. change depending on the degree of voltage application to the light source.
この変化は、例えば第４図に示すようになる。This change is as shown in FIG. 4, for example.
第４図に示す２種の電圧Ｖ、、Ｖ２を表示しようとする
情報に対応させてマトリックス（第２図参１ｊ（４）の
各々のドツトに印加すれば、スクリーン５に所望の情報
が表示される。If the two voltages V, V2 shown in FIG. 4 are applied to each dot in the matrix (1j (4) in FIG. 2) in correspondence with the information to be displayed, the desired information will be displayed on the screen 5. be done.
この場合、ＬＣＩ）セル２の後面側（下面側）電極２Ａ
’に高反射金属電極を用いてドツトパターンと反射面を
兼用させているため、光源１と投影用レンズ３が水平力
向にある間隔において配置されていても（このような配
置関係きなるのは、構成−１−止むを得ない）、ドツト
位置にずれを生じることはなく、灯明な表示となる。In this case, the rear side (lower side) electrode 2A of the LCI) cell 2
' Since a highly reflective metal electrode is used to serve both as a dot pattern and a reflective surface, even if the light source 1 and the projection lens 3 are arranged at a certain interval in the horizontal force direction (such arrangement relationship is In configuration 1 (unavoidable), there is no deviation in the dot position, resulting in a bright display.
因みに、第５図に示すように下面ガラス板２Ａ’の内面
に透明電極１２Ｂ′を形成し、外面に反射板１２Ｅを配
置したＬＣＤセルの場合は、ド、ツト通過位置が反射の
前後でガラス板２Ａ’の厚みａ、（０，３〜１．５ｍｍ
）に応じてずれるようになり、表示映像にずれが生じる
。つまり、２重像となる。Incidentally, in the case of an LCD cell in which a transparent electrode 12B' is formed on the inner surface of the lower glass plate 2A' and a reflective plate 12E is arranged on the outer surface as shown in FIG. Thickness a of plate 2A' (0.3 to 1.5 mm
), resulting in a shift in the displayed image. In other words, it becomes a double image.
なお、前記実施例では、Ｉ、ＣＤセルはＳＴＮ方式きし
たか、重置配向とネガ型ネマテイ・ツクを組合わせたも
の（ＤＡＰ方式）、液晶に色素を添加り、たちの（ＧＨ
方式）などでも可能である。また、偏光反射板をダイク
ロイックミラーとすることにより、光源の光を色分解し
て単色表示あるいはＲ・Ｇ＠Ｂの単色表示をそれぞれ用
意して、再びダイクロイックミラーで合成しスクリーン
上にカラー表示することも可能である。In the above embodiments, the I and CD cells were either STN type, a combination of overlapping alignment and negative nematics (DAP type), or a liquid crystal cell with a dye added to it (GH).
method) etc. In addition, by using a dichroic mirror as the polarizing reflector, the light from the light source is separated into colors, a monochromatic display or R and G@B monochromatic displays are prepared, and the dichroic mirror combines them again to display colors on the screen. It is also possible.
以上のように本発明によれば、偏光板を集光した部位に
配置したので、面積を縮小することができ、経済的であ
る。しかも、第一の偏光部材と第二の偏光部材を光路−
１−分離し、一方を偏光反射板としたので、各々の偏光
部材の光の通過は一度だけとなり、複数回光が通る場合
に比べ光のロスが少なくなって、明るい表示が可能とな
るとともに、第二の偏光部材の単独の角度調整により最
適の表示品位か期待てきる。また、偏光反射板を用いて
いるため、光学レンズ系及びＬ ＣＤセルから最も離れ
た位置に光源を設置することができ、熱対策が容易とな
って、システムの簡素化が図れる。更に、偏光反射板と
して色分解可能なダイクロイックミラーを使用すること
により、カラー表示がｉｉＪ能となるといった利点があ
る。As described above, according to the present invention, since the polarizing plate is disposed at the part where the light is condensed, the area can be reduced, which is economical. Moreover, the first polarizing member and the second polarizing member are connected to each other in the optical path.
1-Since they are separated and one side is used as a polarizing reflector, the light passes through each polarizing member only once, which reduces light loss compared to when light passes through multiple times, making it possible to display brighter images. , it is expected that the display quality will be optimal by adjusting the angle of the second polarizing member alone. Furthermore, since a polarizing reflector is used, the light source can be installed at the farthest position from the optical lens system and the LCD cell, which facilitates heat countermeasures and simplifies the system. Furthermore, by using a dichroic mirror capable of color separation as a polarizing reflector, there is an advantage that color display becomes possible.
第１図は本発明に係る液晶を利用した投影装置の一実施
例を示す構成説明図、第２図及び第３図は同実施例にお
けるＬＣＤセルのドツトパターン説明図、第４図は同Ｌ
ＣＤセルの電圧−透過率特性図、第５図は２重像表示と
なるＬＣＤセルの構造例を示す断面図、第６図は従来例
を示す構成説明図である。FIG. 1 is a configuration explanatory diagram showing one embodiment of a projection device using a liquid crystal according to the present invention, FIGS. 2 and 3 are explanatory diagrams of a dot pattern of an LCD cell in the same embodiment, and FIG.
A voltage-transmittance characteristic diagram of a CD cell, FIG. 5 is a sectional view showing an example of the structure of an LCD cell for double image display, and FIG. 6 is an explanatory diagram of the structure of a conventional example.
Claims (1)
ン電極を透明電極材料によりそれぞれ形成されたＬＣＤ
セルと、光源と、投影用レンズと、投影用スクリーンと
、前記光源からの分散光を平行光線として前記ＬＣＤセ
ルに入射させ、ＬＣＤセルの金属電極からの反射光を再
び集光して前記投影用レンズに導くように前記ＬＣＤセ
ルの前面に装着されたフレネルレンズと、光路上分離さ
れて前記ＬＣＤセルと前記光源、前記投影スクリーンと
の間に配置された第一、第二の偏光部材とを備えてなる
ことを特徴とする液晶を利用した投影装置。An LCD in which one pattern electrode is made of a highly reflective metal film and the other pattern electrode is made of a transparent electrode material.
A cell, a light source, a projection lens, a projection screen, the dispersed light from the light source is made incident on the LCD cell as a parallel beam, and the reflected light from the metal electrode of the LCD cell is focused again to perform the projection. a Fresnel lens attached to the front surface of the LCD cell so as to guide the light to the LCD cell; and first and second polarizing members separated on the optical path and arranged between the LCD cell, the light source, and the projection screen. A projection device using a liquid crystal, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11155490A JPH049030A (en) | 1990-04-26 | 1990-04-26 | Projector using liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11155490A JPH049030A (en) | 1990-04-26 | 1990-04-26 | Projector using liquid crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH049030A true JPH049030A (en) | 1992-01-13 |
Family
ID=14564333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11155490A Pending JPH049030A (en) | 1990-04-26 | 1990-04-26 | Projector using liquid crystal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049030A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6396078B1 (en) * | 1995-06-20 | 2002-05-28 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device with a tapered hole formed using multiple layers with different etching rates |
| SG140523A1 (en) * | 2006-08-18 | 2008-03-28 | Mitsubishi Electric Corp | Projection display apparatus |
-
1990
- 1990-04-26 JP JP11155490A patent/JPH049030A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6396078B1 (en) * | 1995-06-20 | 2002-05-28 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device with a tapered hole formed using multiple layers with different etching rates |
| US6593235B2 (en) * | 1995-06-20 | 2003-07-15 | Semiconductor Energy Laboratory Co., Ltd | Semiconductor device with a tapered hole formed using multiple layers with different etching rates |
| SG140523A1 (en) * | 2006-08-18 | 2008-03-28 | Mitsubishi Electric Corp | Projection display apparatus |
| US7661829B2 (en) | 2006-08-18 | 2010-02-16 | Mitsubishi Electric Corporation | Projection display apparatus |
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