JPH06194621A - Liquid crystal projector - Google Patents
Liquid crystal projectorInfo
- Publication number
- JPH06194621A JPH06194621A JP4358013A JP35801392A JPH06194621A JP H06194621 A JPH06194621 A JP H06194621A JP 4358013 A JP4358013 A JP 4358013A JP 35801392 A JP35801392 A JP 35801392A JP H06194621 A JPH06194621 A JP H06194621A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- temperature
- light
- panels
- crystal panel
- 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
Landscapes
- Liquid Crystal (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は複数の液晶パネルを有す
る液晶プロジェクタに関し、特にその液晶パネルの温度
制御機構に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector having a plurality of liquid crystal panels, and more particularly to a temperature control mechanism for the liquid crystal panels.
【０００２】[0002]
【従来の技術】液晶表示装置として、（Ｒ）（Ｇ）
（Ｂ）の３つの表色系からなる３枚の液晶パネルを有す
る液晶プロジェクタが用いられている。各液晶パネルは
それぞれＲ光、Ｇ光およびＢ光を透過させ、投射レンズ
を介してこれらの光を合成し所定の色の液晶表示を行
う。このような複数の液晶パネルを有する液晶プロジェ
クタの各液晶パネルは、透過率特性の温度依存性を有し
ている。2. Description of the Related Art As a liquid crystal display device, (R) (G)
A liquid crystal projector having three liquid crystal panels of three color systems (B) is used. Each liquid crystal panel transmits R light, G light, and B light, and combines these lights through a projection lens to display liquid crystal of a predetermined color. Each liquid crystal panel of a liquid crystal projector having such a plurality of liquid crystal panels has temperature dependence of transmittance characteristics.
【０００３】図３はこのような液晶パネルの透過率特性
の一例を示し、ＴＮモード液晶パネルのノーマリホワイ
トモードにおける液晶印加電圧に対する相対透過率のグ
ラフを示している。図から分るように、温度Ｔ℃におけ
るγ特性および閾値が，温度が±ΔＴ℃変化することに
より、同一印加電圧に対し温度が上がると透過率は低下
し、温度が下がると透過率が上昇するように大きく変化
する。FIG. 3 shows an example of the transmittance characteristic of such a liquid crystal panel and shows a graph of the relative transmittance with respect to the voltage applied to the liquid crystal in the normally white mode of the TN mode liquid crystal panel. As can be seen from the figure, the γ characteristic and the threshold value at the temperature T ° C change ± ΔT ° C, so that the transmittance decreases when the temperature rises and the transmittance rises when the temperature lowers. Change greatly as you do.
【０００４】このような透過率特性の変化は、そのまま
投射レンズを通して投射される画像に影響を与え、階調
不良や色ごとのγ特性の違いによる階調に基づく色付き
が発生する。このような問題を防ぐためには、液晶パネ
ルの温度を一定に保つ必要がある。Such a change in the transmittance characteristic directly affects the image projected through the projection lens, resulting in defective gradation or coloring due to the gradation due to the difference in the γ characteristic for each color. In order to prevent such a problem, it is necessary to keep the temperature of the liquid crystal panel constant.
【０００５】従来の複数枚の液晶パネルを有する液晶プ
ロジェクタにおいては、例えば特開平４−４２７号公報
に開示されているように、液晶パネルを含む液晶プロジ
ェクタ内部全体を単一のファンで冷却して温度制御を行
っていた。即ち、従来の液晶プロジェクタにおいては、
液晶パネルおよび回路等の冷却手段として、給気ファン
および／または排気ファンを設け、プロジェクタ内のど
こか１点（例えば光学シャーシの金属部）で温度検出を
行い、この部分の雰囲気温度に基づいてファンを駆動し
て温度制御を行っていた。In a conventional liquid crystal projector having a plurality of liquid crystal panels, a single fan cools the entire interior of the liquid crystal projector including the liquid crystal panel, as disclosed in, for example, Japanese Patent Laid-Open No. 4-427. The temperature was controlled. That is, in the conventional liquid crystal projector,
An air supply fan and / or an exhaust fan is provided as a cooling means for the liquid crystal panel and circuits, the temperature is detected at one point in the projector (for example, the metal part of the optical chassis), and based on the ambient temperature of this part. The temperature was controlled by driving the fan.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来の
液晶プロジェクタにおいては、単一のファンを用いてプ
ロジェクタ内部全体を冷却して温度制御を行っていたた
め、各液晶パネルの温度制御が不十分となり、液晶パネ
ルの温度変化に基づく透過率特性の変化を十分に防止で
きず、このため投射画像の階調不良や、（Ｒ）（Ｇ）
（Ｂ）の各パネル間の温度差や温度変化の差に起因する
色むらおよび白色均一性の不良等を起こす原因となって
いた。However, in the conventional liquid crystal projector, since the temperature inside the projector is controlled by cooling the entire inside of the projector by using a single fan, the temperature control of each liquid crystal panel becomes insufficient. It is not possible to sufficiently prevent the change of the transmittance characteristic due to the temperature change of the liquid crystal panel, and therefore the gradation defect of the projected image and (R) (G)
This is a cause of causing color unevenness and poor white uniformity due to the temperature difference between the panels of FIG.
【０００７】本発明は、上記従来技術の欠点に鑑みなさ
れたものであって、複数の液晶パネルを有する液晶プロ
ジェクタにおいて、各液晶パネルの温度を個々に確実に
制御し、パネルの透過率特性の温度依存性に基づく階調
不良や色むらを低減させ投影画像品質の向上を図った液
晶プロジェクタの提供を目的とする。The present invention has been made in view of the above-mentioned drawbacks of the prior art. In a liquid crystal projector having a plurality of liquid crystal panels, the temperature of each liquid crystal panel can be individually and reliably controlled, and the transmittance characteristic of the panel can be controlled. An object of the present invention is to provide a liquid crystal projector that improves the projected image quality by reducing gradation defects and color unevenness due to temperature dependence.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するた
め、本発明では、複数の液晶パネルを有する液晶プロジ
ェクタにおいて、上記複数の液晶パネルのそれぞれに冷
却手段を設けている。本発明が適用される好ましい実施
例においては、前記複数の液晶パネルは、Ｒ光、Ｇ光お
よびＢ光をそれぞれ透過させる３枚の板により構成され
ている。To achieve the above object, in the present invention, in a liquid crystal projector having a plurality of liquid crystal panels, a cooling means is provided for each of the plurality of liquid crystal panels. In a preferred embodiment to which the present invention is applied, the plurality of liquid crystal panels are composed of three plates that respectively transmit R light, G light and B light.
【０００９】さらに好ましい実施例においては、前記冷
却手段はファンにより構成されている。さらに好ましい
実施例においては、前記冷却手段を駆動制御する制御回
路を備え、前記複数の液晶パネルのそれぞれに温度検出
手段を設け、各温度検出手段を前記制御回路に接続して
いる。In a further preferred embodiment, the cooling means comprises a fan. In a further preferred embodiment, a control circuit for driving and controlling the cooling means is provided, temperature detection means is provided for each of the plurality of liquid crystal panels, and each temperature detection means is connected to the control circuit.
【００１０】[0010]
【作用】複数の液晶パネルの各液晶パネルごとにファン
等の冷却手段を設け、各パネルごとにファンを駆動制御
してそれぞれの液晶パネルを個別に温度制御する。A cooling means such as a fan is provided for each liquid crystal panel of the plurality of liquid crystal panels, and the fan is drive-controlled for each panel to individually control the temperature of each liquid crystal panel.
【００１１】[0011]
【実施例】図１は本発明の実施例に係る液晶プロジェク
タの構成図である。この液晶プロジェクタは、白色ラン
プ１と、Ｒ光を反射するダイクロイックミラー２，３
と、このＲ光が透過する液晶パネル（ＬＣＤ）５および
光学レンズ系４と、Ｇ光を反射するダイクロイックミラ
ー６，７と、このＧ光が透過する液晶パネル（ＬＣＤ）
９および光学レンズ系８と、Ｂ光を反射するダイクロイ
ックミラー１０，１１と、このＢ光が透過する液晶パネ
ル１３および光学レンズ系１２と、分離したＲＧＢの各
光が合成されて透過する投射レンズ１４とを具備してい
る。1 is a block diagram of a liquid crystal projector according to an embodiment of the present invention. This liquid crystal projector includes a white lamp 1 and dichroic mirrors 2 and 3 that reflect R light.
A liquid crystal panel (LCD) 5 and an optical lens system 4 that transmit the R light, dichroic mirrors 6 and 7 that reflect the G light, and a liquid crystal panel (LCD) that transmits the G light.
9 and an optical lens system 8, dichroic mirrors 10 and 11 for reflecting B light, a liquid crystal panel 13 and an optical lens system 12 for transmitting the B light, and a projection lens for transmitting the separated RGB lights by combining them. 14 are provided.
【００１２】白色ランプ１から出た白色光は、各ダイク
ロイックミラー２，３，６，７，１０，１１により所定
波長のＲ光、Ｇ光およびＢ光に分離されそれぞれの光路
上の液晶パネル５，９，１３を通過する。このとき各液
晶パネルはＲ、Ｇ、Ｂの各光の画像成分信号の光シャッ
ターとして作用し、各液晶パネルをそれぞれ駆動制御す
ることにより、Ｒ光、Ｇ光およびＢ光の構成比率を制御
し投射レンズ１４で合成して所定の色調の画像信号を得
る。The white light emitted from the white lamp 1 is separated into R light, G light and B light of predetermined wavelengths by the dichroic mirrors 2, 3, 6, 7, 10 and 11, and the liquid crystal panel 5 on each optical path. , 9, 13 are passed. At this time, each liquid crystal panel acts as an optical shutter for the image component signal of each light of R, G, B, and controls the drive of each liquid crystal panel to control the composition ratio of R light, G light, and B light. The projection lens 14 synthesizes them to obtain an image signal of a predetermined color tone.
【００１３】Ｒ光、Ｇ光およびＢ光が各々通過する３枚
の液晶パネル５，９，１３の位置には、それぞれ冷却フ
ァン１５，１６，１７が設けられる。各冷却ファン１
５，１６，１７は、それぞれ対応する液晶パネル５，
９，１３の温度に応じて駆動制御され、パネルごとにそ
の温度を所定の温度に保つように制御する。Cooling fans 15, 16 and 17 are provided at the positions of the three liquid crystal panels 5, 9 and 13 through which the R light, G light and B light respectively pass. Each cooling fan 1
5, 16 and 17 are corresponding liquid crystal panels 5, 5, respectively.
The driving is controlled according to the temperatures of 9 and 13, and the temperature of each panel is controlled to be maintained at a predetermined temperature.
【００１４】図２は、上記冷却ファンの制御回路構成の
一例を示す。Ｒ光用の液晶パネル５に温度検出用のダイ
オード１８が設けられ、このダイオード１８はオペアン
プ１９の入力側に接続される。オペアンプ１９の出力側
はマイコン（ＣＰＵ）２１に接続されるとともに冷却フ
ァン１５の駆動回路２０に接続される。駆動回路２０に
は電源２２が接続されるとともにマイコン２１が接続さ
れる。液晶パネル５の設定温度は、オペアンプ１９に接
続される抵抗の値を変えることにより任意に設定可能で
ある。FIG. 2 shows an example of the control circuit configuration of the cooling fan. A diode 18 for temperature detection is provided on the liquid crystal panel 5 for R light, and the diode 18 is connected to the input side of an operational amplifier 19. The output side of the operational amplifier 19 is connected to the microcomputer (CPU) 21 and the drive circuit 20 of the cooling fan 15. The drive circuit 20 is connected to the power supply 22 and the microcomputer 21. The set temperature of the liquid crystal panel 5 can be arbitrarily set by changing the value of the resistor connected to the operational amplifier 19.
【００１５】上記構成の制御回路において、ダイオード
１８で検出した温度に応じてオペアンプ１９を介してフ
ァン１５の駆動回路２０を制御し、設定温度との差に応
じて風量等を調整して液晶パネル５を所定の温度に保
つ。この場合、風量の設定は周囲の温度等を考慮してマ
イコン２１に予め組込んだプログラムに基づいて駆動回
路２０を制御することにより高精度の温度制御が達成さ
れる。なお、オペアンプ１９とファン５の駆動回路２０
とは直接連結せずにマイコン２１を介してのみ接続して
もよい。また、特にマイコン２１を用いずに、オペアン
プ１９の出力に応じて駆動回路２０を介して所定の出力
でファン５を駆動制御することもできる。In the control circuit having the above-mentioned structure, the drive circuit 20 of the fan 15 is controlled through the operational amplifier 19 according to the temperature detected by the diode 18, and the air volume and the like are adjusted according to the difference from the set temperature, thereby the liquid crystal panel. Keep 5 at the desired temperature. In this case, high-precision temperature control is achieved by setting the air flow rate by controlling the drive circuit 20 based on a program previously incorporated in the microcomputer 21 in consideration of the ambient temperature and the like. The operational circuit 19 and the drive circuit 20 for the fan 5
It may be connected only via the microcomputer 21 without directly connecting with. Further, it is also possible to drive and control the fan 5 with a predetermined output via the drive circuit 20 according to the output of the operational amplifier 19 without using the microcomputer 21.
【００１６】マイコン２１にはさらに、上記Ｒ光用の液
晶パネル５の回路と同様に、Ｇ光用の液晶パネル９およ
びＢ光用の液晶パネル１３の温度検出信号がそれぞれの
オペアンプ（図示しない）から入力されるとともに、各
液晶パネル９，１３を冷却するための冷却ファン１６，
１７を駆動する駆動回路（図示しない）が接続される。
このような構成により、周囲温度に合せて各液晶パネル
を最適温度に制御するとともに、各液晶パネル間で温度
差を設けて相対透過率を異ならせ、Ｒ光、Ｇ光およびＢ
光の構成比率を調整し所望の色調の画像を得るように制
御することができる。Further, in the microcomputer 21, similarly to the circuit of the liquid crystal panel 5 for R light, the temperature detection signals of the liquid crystal panel 9 for G light and the liquid crystal panel 13 for B light are respectively operational amplifiers (not shown). And a cooling fan 16 for cooling the liquid crystal panels 9 and 13,
A drive circuit (not shown) for driving 17 is connected.
With such a configuration, each liquid crystal panel is controlled to an optimum temperature in accordance with the ambient temperature, and a relative temperature difference is provided between the liquid crystal panels so that the relative transmittances are different from each other.
It is possible to control the composition ratio of light to obtain an image having a desired color tone.
【００１７】[0017]
【発明の効果】以上説明したように、本発明に係る液晶
プロジェクタにおいては、複数の液晶パネルの各々の対
し冷却手段（ファン）を設け、各液晶パネルごとに温度
制御を行っているため、温度制御の信頼性が高まり各液
晶パネルを一定温度または所望の設定温度に正確に保つ
ことができ、液晶パネルの温度依存性に基づく階調不良
や色むらを低減させ投影画像の品質を向上させることが
できる。As described above, in the liquid crystal projector according to the present invention, the cooling means (fan) is provided for each of the plurality of liquid crystal panels, and the temperature control is performed for each liquid crystal panel. Control reliability is improved, each liquid crystal panel can be maintained at a constant temperature or a desired set temperature accurately, and gradation defects and color unevenness due to the temperature dependence of the liquid crystal panel can be reduced to improve the quality of the projected image. You can
【００１８】また、従来のように装置内全体を冷却する
構成に比べ通風経路の設計の自由度が高まり、適用場所
に応じた各種形状の構成が可能になりまた小型化が図ら
れる。また、各液晶パネルを集中的に冷却するため、冷
却効率が高まり、消費電力の節約およびファンの静音化
が図られる。Further, the degree of freedom in designing the ventilation path is increased as compared with the conventional structure in which the entire device is cooled, and various shapes according to the application place can be realized and the size can be reduced. Further, since each liquid crystal panel is intensively cooled, cooling efficiency is increased, power consumption is saved, and fan noise is reduced.
【図１】 本発明の実施例に係る液晶プロジェクタの要
部構成図である。FIG. 1 is a configuration diagram of a main part of a liquid crystal projector according to an embodiment of the present invention.
【図２】 図１の液晶プロジェクタの温度制御回路図で
ある。FIG. 2 is a temperature control circuit diagram of the liquid crystal projector of FIG.
【図３】 液晶パネルの透過率の温度依存性を示す特性
図である。FIG. 3 is a characteristic diagram showing temperature dependence of transmittance of a liquid crystal panel.
１：白色ランプ、２，３：ダイクロイックミラー、５：
Ｒ光用液晶パネル、６，７：ダイクロイックミラー、
９：Ｇ光用液晶パネル、１０，１１：ダイクロイックミ
ラー、１３：Ｂ光用液晶パネル、１４：投射レンズ、１
５，１６，１７：冷却ファン、１８：温度検出用ダイオ
ード、１９：オペアンプ、２０：ファン駆動回路、２
１：マイコン、２２：電源。1: White lamp, 2, 3: Dichroic mirror, 5:
R light liquid crystal panel, 6, 7: dichroic mirror,
9: Liquid crystal panel for G light, 10, 11: Dichroic mirror, 13: Liquid crystal panel for B light, 14: Projection lens, 1
5, 16 and 17: cooling fan, 18: temperature detection diode, 19: operational amplifier, 20: fan drive circuit, 2
1: Microcomputer, 22: Power supply.
Claims (4)
クタにおいて、上記複数の液晶パネルのそれぞれに冷却
手段を設けたことを特徴とする液晶プロジェクタ。1. A liquid crystal projector having a plurality of liquid crystal panels, wherein each of the plurality of liquid crystal panels is provided with a cooling means.
よびＢ光をそれぞれ透過させる３枚の板からなることを
特徴とする請求項１に記載の液晶プロジェクタ。2. The liquid crystal projector according to claim 1, wherein each of the plurality of liquid crystal panels includes three plates that transmit R light, G light, and B light, respectively.
特徴とする請求項１に記載の液晶プロジェクタ。3. The liquid crystal projector according to claim 1, wherein the cooling unit includes a fan.
備え、前記複数の液晶パネルのそれぞれに温度検出手段
を設け、各温度検出手段を前記制御回路に接続したこと
を特徴とする請求項１に記載の液晶プロジェクタ。4. A control circuit for driving and controlling the cooling means, a temperature detecting means is provided for each of the plurality of liquid crystal panels, and each temperature detecting means is connected to the control circuit. The liquid crystal projector according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4358013A JPH06194621A (en) | 1992-12-25 | 1992-12-25 | Liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4358013A JPH06194621A (en) | 1992-12-25 | 1992-12-25 | Liquid crystal projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06194621A true JPH06194621A (en) | 1994-07-15 |
Family
ID=18457100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4358013A Pending JPH06194621A (en) | 1992-12-25 | 1992-12-25 | Liquid crystal projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06194621A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19524131A1 (en) * | 1995-07-03 | 1997-01-09 | Thomson Brandt Gmbh | Video signal controllable, handheld optical image projector - displays image supplied from video recorder to liquid crystal light valve traversed by arc light and cooled by draught of extractor fan |
| JPH10133178A (en) * | 1996-10-29 | 1998-05-22 | Mitsubishi Electric Corp | Projection type liquid crystal display device |
| EP1065552A2 (en) * | 1999-06-29 | 2001-01-03 | Sony Corporation | Projection display devices |
| US6283614B1 (en) | 1999-01-18 | 2001-09-04 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal projection apparatus and lamp |
| EP1070979A3 (en) * | 1999-07-21 | 2001-10-10 | Sharp Kabushiki Kaisha | Liquid crystal projector |
| JP2002357865A (en) * | 2001-05-31 | 2002-12-13 | Canon Inc | Projection type picture display device |
| US6776489B2 (en) | 2001-10-30 | 2004-08-17 | Canon Kabushiki Kaisha | Color separation/combination optical system, image display optical system, and projection type image display apparatus |
| KR100601604B1 (en) * | 1999-04-29 | 2006-07-14 | 삼성전자주식회사 | Display panel temperature controlling apparatus for reflection type projector |
| JP2018049205A (en) * | 2016-09-23 | 2018-03-29 | 株式会社Ｊｖｃケンウッド | Liquid crystal projector apparatus |
| JP2018049207A (en) * | 2016-09-23 | 2018-03-29 | 株式会社Ｊｖｃケンウッド | Liquid crystal projector apparatus |
| US20180088450A1 (en) * | 2016-09-23 | 2018-03-29 | JVC Kenwood Corporation | Liquid crystal projector apparatus |
| JP2018128615A (en) * | 2017-02-09 | 2018-08-16 | キヤノン株式会社 | Image display device and image display system using the same |
| JP2019191389A (en) * | 2018-04-26 | 2019-10-31 | キヤノン株式会社 | Projection type display device and program |
-
1992
- 1992-12-25 JP JP4358013A patent/JPH06194621A/en active Pending
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|---|---|---|---|---|
| DE19524131A1 (en) * | 1995-07-03 | 1997-01-09 | Thomson Brandt Gmbh | Video signal controllable, handheld optical image projector - displays image supplied from video recorder to liquid crystal light valve traversed by arc light and cooled by draught of extractor fan |
| JPH10133178A (en) * | 1996-10-29 | 1998-05-22 | Mitsubishi Electric Corp | Projection type liquid crystal display device |
| US6283614B1 (en) | 1999-01-18 | 2001-09-04 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal projection apparatus and lamp |
| KR100601604B1 (en) * | 1999-04-29 | 2006-07-14 | 삼성전자주식회사 | Display panel temperature controlling apparatus for reflection type projector |
| EP1965250A1 (en) * | 1999-06-29 | 2008-09-03 | Sony Corporation | Projection display device with air cooling system |
| EP1065552A2 (en) * | 1999-06-29 | 2001-01-03 | Sony Corporation | Projection display devices |
| EP1965248A3 (en) * | 1999-06-29 | 2008-09-17 | Sony Corporation | Projection display device with air cooling system |
| EP1965247A3 (en) * | 1999-06-29 | 2008-09-17 | Sony Corporation | Projection display device with air cooling system |
| EP1065552A3 (en) * | 1999-06-29 | 2004-03-31 | Sony Corporation | Projection display devices |
| EP1965249A1 (en) * | 1999-06-29 | 2008-09-03 | Sony Corporation | Projection display device with air cooling system |
| US6473150B1 (en) | 1999-07-21 | 2002-10-29 | Sharp Kabushiki Kaisha | Liquid crystal display apparatus with a first blower for blue section and a second blower for red and green sections |
| EP1070979A3 (en) * | 1999-07-21 | 2001-10-10 | Sharp Kabushiki Kaisha | Liquid crystal projector |
| JP2002357865A (en) * | 2001-05-31 | 2002-12-13 | Canon Inc | Projection type picture display device |
| US6776489B2 (en) | 2001-10-30 | 2004-08-17 | Canon Kabushiki Kaisha | Color separation/combination optical system, image display optical system, and projection type image display apparatus |
| JP2018049205A (en) * | 2016-09-23 | 2018-03-29 | 株式会社Ｊｖｃケンウッド | Liquid crystal projector apparatus |
| JP2018049207A (en) * | 2016-09-23 | 2018-03-29 | 株式会社Ｊｖｃケンウッド | Liquid crystal projector apparatus |
| US20180088450A1 (en) * | 2016-09-23 | 2018-03-29 | JVC Kenwood Corporation | Liquid crystal projector apparatus |
| US10209608B2 (en) * | 2016-09-23 | 2019-02-19 | JVC Kenwood Corporation | Liquid crystal projector apparatus |
| JP2018128615A (en) * | 2017-02-09 | 2018-08-16 | キヤノン株式会社 | Image display device and image display system using the same |
| JP2019191389A (en) * | 2018-04-26 | 2019-10-31 | キヤノン株式会社 | Projection type display device and program |
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