JP2006023776A - Projection video display device - Google Patents

Projection video display device Download PDF

Info

Publication number
JP2006023776A
JP2006023776A JP2005255822A JP2005255822A JP2006023776A JP 2006023776 A JP2006023776 A JP 2006023776A JP 2005255822 A JP2005255822 A JP 2005255822A JP 2005255822 A JP2005255822 A JP 2005255822A JP 2006023776 A JP2006023776 A JP 2006023776A
Authority
JP
Japan
Prior art keywords
beam splitter
light
polarizing beam
projection
liquid crystal
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
JP2005255822A
Other languages
Japanese (ja)
Inventor
Kozo Sato
剛三 佐藤
Nobuaki Kabuto
展明 甲
Satoshi Ouchi
敏 大内
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2005255822A priority Critical patent/JP2006023776A/en
Publication of JP2006023776A publication Critical patent/JP2006023776A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Projection Apparatus (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high-contrast projection type video display device. <P>SOLUTION: The occurrence of birefringence is suppressed by specifying the product of three; the photoelastic coefficient of polarizing transmission components, such as a polarizing beam splitter used in combination with a reflection type liquid crystal panel, a dichroic prism, the stress acting on these components and light transmission length to a specified value or below. Also, the stress acting on the components is relaxed by using elastic stop implements in supporting and fixing of the optical components through which the polarized light, i.e., image light, is transmitted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、投射型表示装置に係わり、特に高コントラスト化を実現する反射型液晶パネルを用いた投射型表示装置に関する。 The present invention relates to a projection display device, and more particularly to a projection display device using a reflective liquid crystal panel that realizes high contrast.

反射形液晶パネル、該反射型液晶パネルへ入射させる偏光を形成するための偏光ビームスプリッタ等からなる従来の投写型液晶表示装置として、例えば、特開平９−５４２１３号公報に開示された技術が挙げられる。 As a conventional projection type liquid crystal display device comprising a reflection type liquid crystal panel and a polarization beam splitter for forming polarized light to be incident on the reflection type liquid crystal panel, for example, a technique disclosed in JP-A-9-54213 is cited. It is done.

上記の投写型液晶表示装置おいては、光源からの白色光はクロスダイクロイックミラーでＲ光、Ｇ光、Ｂ光の３色に分光された後、偏光ビームスプリッタを経て偏光となり、Ｒ画像表示用、Ｇ画像表示用、Ｂ画像表示用それぞれのモノクロ反射形液晶パネルに入射する構成である。該反射形液晶パネルへの入射光は該反射形液晶パネルで反射し該液晶パネルより出射、該偏光ビームスプリッタで検光された後、投写レンズで画像投写する。 In the above projection type liquid crystal display device, the white light from the light source is split into three colors of R light, G light, and B light by a cross dichroic mirror, and then becomes polarized light through a polarizing beam splitter. , G image display and B image display for each monochrome reflection type liquid crystal panel. Light incident on the reflective liquid crystal panel is reflected by the reflective liquid crystal panel, emitted from the liquid crystal panel, analyzed by the polarizing beam splitter, and then projected by a projection lens.

上記構成において、偏光ビームスプリッタの光弾性定数を１．５×１０-8cm2／Ｎ以下としており、この設定により該ビームスプリッタの複屈折を小さくできる可能性があり、それにより該表示装置の投写画像を高コントラストにできる可能性がある。 In the above configuration, the photoelastic constant of the polarizing beam splitter is 1.5 × 10 −8 cm 2 / N or less, and this setting may reduce the birefringence of the beam splitter. There is a possibility that the projected image can have high contrast.

一般に、偏光ビームスプリッタなどの光透過部品で生ずる複屈折の大きさを左右する因子としては、該材料の光弾性定数Ｃ、該部品へ加わる応力Ｆ、該部品の光透過長Ｌ、該部品を透過する光の波長λ等がある。該光透過部品に偏光を入射させたときに該部品内で生ずる複屈折の大きさは該部品内で生ずる位相差ΔＳに関連しており、位相差ΔＳが大きくなると複屈折も大きくなる。その位相差ΔＳは一般に次式（１）であらわすことができる。 In general, factors affecting the magnitude of birefringence generated in a light transmission component such as a polarizing beam splitter include the photoelastic constant C of the material, the stress F applied to the component, the light transmission length L of the component, the component There is a wavelength λ of transmitted light. The magnitude of birefringence generated in the component when polarized light is incident on the light transmitting component is related to the phase difference ΔS generated in the component, and the birefringence increases as the phase difference ΔS increases. The phase difference ΔS can be generally expressed by the following equation (1).

ΔＳ＝２π・Ｃ・Ｆ・Ｌ／λ…………（１）
ただし、Ｃ：光透過部品材料の光弾性定数〔m2／Ｎ〕
Ｆ：光透過部品材料へ加わる応力〔Ｎ／m2〕
Ｌ：光透過部品の光透過長 〔ｍ〕
λ：光の波長 〔ｍ〕
すなわち、光透過部品において生ずる複屈折の大きさは光透過部品材料の光弾性定数、該部品に加わる応力、該部品の光透過長に比例し、光の波長に反比例する関係にある。 ΔS = 2π · C · F · L / λ (1)
Where C: photoelastic constant of light transmitting component material [m 2 / N]
F: Stress applied to the light transmissive component material [N / m 2 ]
L: Light transmission length of light transmission component [m]
λ: wavelength of light [m]
That is, the magnitude of birefringence generated in the light transmissive component is proportional to the photoelastic constant of the light transmissive component material, the stress applied to the component, the light transmission length of the component, and inversely proportional to the wavelength of light.

ところで、前記特開平９−５４２１３号公報では光透過部品で生ずる複屈折低減のため光弾性定数の上限値を１．５×１０-8cm2／Ｎとしているが、他の因子については述べていない。光弾性定数の上限値を１．５×１０-8cm2／Ｎとしても、光透過部品へ加わる応力が大きく、該部品が大きく、光透過長が長い場合は該部品で生ずる複屈折を小さくすることができない。また、光透過部品が非常に小さく、該部品のへ加わる応力も非常に小さい場合、該部品の光弾性定数を１．５×１０-8cm2／Ｎより大としても複屈折を小さく抑えることが出来る可能性がある。 By the way, in the above-mentioned Japanese Patent Application Laid-Open No. 9-54213, the upper limit value of the photoelastic constant is set to 1.5 × 10 −8 cm 2 / N in order to reduce the birefringence generated in the light transmitting component, but other factors are described. Absent. Even when the upper limit of the photoelastic constant is 1.5 × 10 −8 cm 2 / N, when the stress applied to the light transmission component is large, the component is large, and the light transmission length is long, the birefringence generated in the component is small. Can not do it. Also, when the light transmitting component is very small and the stress applied to the component is very small, the birefringence can be kept small even if the photoelastic constant of the component is larger than 1.5 × 10 −8 cm 2 / N. May be possible.

すなわち、前記従来技術特開平９−５４２１３号公報によれば偏光ビームスプリッタで生ずる複屈折を小さく出来る場合もあるが、出来ない場合もあり、前記従来技術だけでは偏光ビームスプリッタで生ずる複屈折低減、投写型映像表示装置の高コントラスト化にとって不十分である。 That is, according to the prior art Japanese Patent Application Laid-Open No. 9-54213, the birefringence generated by the polarizing beam splitter may be reduced, but may not be possible. This is insufficient for increasing the contrast of the projection display apparatus.

本発明の目的は上記問題点を解決し、画像光を形成するための偏光ビームスプリッタ、または他の透明光学部品で生ずる複屈折を抑制し、該スプリッタ、または該光学部品を適用した投写型映像表示装置の投写画像を十分に高画質、高コントラスト化する構成を得ることにある。 An object of the present invention is to solve the above-described problems, suppress birefringence generated in a polarizing beam splitter for forming image light, or other transparent optical component, and apply the splitter or the optical component. An object of the present invention is to obtain a configuration in which a projected image of a display device has sufficiently high image quality and high contrast.

本発明は上記した目的を達成するため、画像光を形成するための偏光を透過させる光学部品、具体的な部品として、光学部品に誘電体多層膜を形成してなる偏光ビームスプリッタ、またはダイクロイックプリズム等において、該光学部品使用時における該光学部品に加わる応力をＦ〔N/m2〕、光が該透明光学部品、該ビームスプリッタ中を透過するときの該部品、該スプリッタ中の光透過長をＬ〔ｍ〕、それらの光弾性定数をＣ〔m2/N〕、透過光の中心波長をλ〔ｍ〕としたとき、それらＦ、Ｌ、Ｃ、λが、（２π／λ）×Ｆ×Ｌ×Ｃ≦０．１ を満足する関係となるような構成とした。 また、投写型映像表示装置において前記構成の偏光ビームスプリッタ、ダイクロイックプリズムを適用する光学系構成とした。さらに、投写形液晶表示装置内における偏光ビームスプリッタ、ダイクロイックプリズムの設置方法として、弾性体、弾力性止め具等を介しての設置など該偏光ビームスプリッタ、ダイクロイックプリズム等に出来るだけ応力が加わらない手段を適用した。反射型液晶パネルと該透明光学部品の相互位置を固定しなければならない場合、それら両者を弾性体、または弾力性止め具等を介して装置内に設置する手段等を適用した。 In order to achieve the above-described object, the present invention provides an optical component that transmits polarized light for forming image light, a polarization beam splitter formed by forming a dielectric multilayer film on the optical component, or a dichroic prism as a specific component. F (N / m 2 ), the stress applied to the optical component when the optical component is used, the transparent optical component, the component when the light is transmitted through the beam splitter, and the light transmission length in the splitter Is L [m], their photoelastic constant is C [m 2 / N], and the center wavelength of transmitted light is λ [m], F, L, C, and λ are (2π / λ) × It was set as the structure which becomes the relationship which satisfies FxLxC <= 0.1. In the projection display apparatus, the optical system configuration to which the polarizing beam splitter and the dichroic prism having the above-described configuration are applied. Further, as a method of installing the polarizing beam splitter and dichroic prism in the projection type liquid crystal display device, means for applying as little stress as possible to the polarizing beam splitter, dichroic prism, etc. such as installation through an elastic body, elastic stopper, etc. Applied. When the mutual position of the reflective liquid crystal panel and the transparent optical component had to be fixed, means for installing both of them in the apparatus via an elastic body or a resilient stopper was applied.

以上のように、本発明によれば、偏光ビームスプリッタ、ダイクロイックプリズム等光学部品に画像形成のための偏光が透過する際、生ずる位相差状態の変化を抑制することが出来、従って、投写レンズ、液晶パネルそれぞれのコントラストが３００以上ある場合は反射型液晶表示装置の投写画像コントラストとして１００以上のコントラストを得ることが出来る。また、本発明構成では透明部品の光弾性定数が多少大きい場合でもそれに加わる応力を緩和できるので、位相差状態変化の発生を抑制することが出来、結果的に光弾性の大きい部品を使用しても高コントラスト画像の表示が可能となる。 As described above, according to the present invention, it is possible to suppress a change in the phase difference state that occurs when polarized light for image formation is transmitted to an optical component such as a polarizing beam splitter or a dichroic prism. When the contrast of each liquid crystal panel is 300 or more, a contrast of 100 or more can be obtained as the projected image contrast of the reflective liquid crystal display device. Further, in the configuration of the present invention, even when the photoelastic constant of the transparent component is somewhat large, the stress applied to it can be relieved, so that the occurrence of a phase difference state can be suppressed, and as a result, a component having a large photoelasticity is used. In addition, a high-contrast image can be displayed.

以下、本発明の実施の形態を、図面を用いて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明による偏光ビームスプリッタ、および該ビームスプリッタを適用した投写型映像表示装置である第１実施形態の光学系要部の模式構成図である。同図において、１は光源、２は反射型液晶パネル、３は偏光ビームスプリッタ、４は投写レンズである。なお、他の光学系部品は本発明の本質を説明する上で、必須でないため省略してある。 FIG. 1 is a schematic configuration diagram of a main part of an optical system according to a first embodiment which is a polarizing beam splitter according to the present invention and a projection display apparatus to which the beam splitter is applied. In the figure, 1 is a light source, 2 is a reflective liquid crystal panel, 3 is a polarizing beam splitter, and 4 is a projection lens. Other optical system parts are omitted because they are not essential for explaining the essence of the present invention.

図１の構成において、光源からの出射光５は側面の寸法形状がl×ｈの偏光ビームスプリッタ３の光入射面３−１から入射し、誘電体多層膜を形成した偏光分離面３−２でＰ波、Ｓ波に分離される。これらＰ波、Ｓ波のうちＰ波は直進して第１の光出射面３−３から偏光ビームスプリッタ３外に出射する。一方、Ｓ波は入射方向、及びＰ波出射光方向に対して９０度異なった方向に進み、第２の光出射光面３−４から該偏光ビームスプリッタ３外に出射し、該出射光は反射型液晶パネル２への入射光６となる。該入射光６は該液晶パネル２の反射面（図示せず）で反射し、また、表示画像内容に対応した偏光状態となり該パネル２から出射し、偏光ビームスプリッタ３に再入射する。該再入射光７は偏光分離面３−２で画像光となるＰ波７−１と不要光となるＳ波７−２に分離され、画像光であるＰ波７−１は光出射面３−５から出射し、投写レンズ４を経てスクリーン（図示せず）上への投写光８になる。 In the configuration of FIG. 1, the outgoing light 5 from the light source is incident from the light incident surface 3-1 of the polarization beam splitter 3 whose side dimension is l × h, and a polarization separation surface 3-2 on which a dielectric multilayer film is formed. Is separated into P wave and S wave. Among these P waves and S waves, the P wave travels straight and exits from the first light exit surface 3-3 to the outside of the polarization beam splitter 3. On the other hand, the S wave travels in a direction different by 90 degrees with respect to the incident direction and the P wave emission light direction, and is emitted from the second light emission light surface 3-4 to the outside of the polarization beam splitter 3, and the emission light is The incident light 6 enters the reflective liquid crystal panel 2. The incident light 6 is reflected by a reflecting surface (not shown) of the liquid crystal panel 2, enters a polarization state corresponding to the display image content, exits from the panel 2, and reenters the polarization beam splitter 3. The re-incident light 7 is separated by the polarization separation surface 3-2 into a P wave 7-1 as image light and an S wave 7-2 as unnecessary light, and the P wave 7-1 as image light is emitted from the light exit surface 3. The light exits from −5, passes through the projection lens 4, and becomes projection light 8 on a screen (not shown).

投写型映像表示装置の表示画像のコントラストを高めるには液晶パネル２の性能、偏光ビームスプリッタ３の性能、投写レンズ４の性能を高めることが重要である。偏光ビームスプリッタ３の高性能化に着目した場合、該ビームスプリッタ３の偏光分離面３−２でのＰ波、Ｓ波の分離性能がよいことのほかに、該Ｐ波、Ｓ波が偏光ビームスプリッタ３内部透過時にその偏光状態が保存されること、すなわち、該ビームスプリッタ内での新たな複屈折の発生を抑えることが重要である。 In order to increase the contrast of the display image of the projection display apparatus, it is important to improve the performance of the liquid crystal panel 2, the performance of the polarization beam splitter 3, and the performance of the projection lens 4. When attention is focused on the enhancement of the performance of the polarization beam splitter 3, in addition to the good separation performance of the P wave and S wave on the polarization separation surface 3-2 of the beam splitter 3, the P wave and S wave are polarized light beams. It is important that the polarization state is preserved during transmission through the splitter 3, that is, it is important to suppress the occurrence of new birefringence in the beam splitter.

一般に、画像表示用の偏光が部品透過中に新たな複屈折、すなわち、新たな位相差を生じた場合、その位相差成分は画像全体を白く浮かせる漏れ光となる。すなわち、該光学部品が図１の３に示す偏光ビームスプリッタの場合、新たな複屈折成分は反射型液晶パネル２の表示画像コントラストを低下させることになる。 In general, when the polarized light for image display causes a new birefringence, that is, a new phase difference during the transmission of the component, the phase difference component becomes leakage light that makes the whole image float white. That is, when the optical component is the polarization beam splitter shown in FIG. 1, the new birefringence component reduces the display image contrast of the reflective liquid crystal panel 2.

ところで、画像表示用偏光が偏光ビームスプリッタ等の光学部品を透過中に生じた位相差に起因して発生する漏洩光強度Ｔはほぼ次式（２）で表すことが出来る。 By the way, the leakage light intensity T generated due to the phase difference generated while the image display polarized light is transmitted through the optical component such as the polarization beam splitter can be expressed by the following equation (2).

Ｔ＝Ｋsin2(ΔS/2) ……………… （２）
Ｋ：定数
ΔＳ：透明部品中で新たに生じた位相差
反射型液晶パネルが、全ての表示諧調にわたって良好なコントラストを得るには漏れ光sin2(ΔS/2)の値を出来るだけ小さくする必要がある。通常、投写画像を良好なコントラストと認識する上で必要なコントラスト値としては少なくとも約１００程度のコントラストが必要である。液晶パネル２の表示画像の投写表示において、そのコントラストを左右する要因として、液晶パネル２の性能、偏光ビームスプリッタ３の性能、投写レンズ４の性能等が考えられるが、上記画像コントラストとして少なくとも約１００程度のコントラストを得るには各種主要部品のコントラスト性能を約１００の３倍の少なくとも約３００程度必要である。 T = Ksin 2 (ΔS / 2) (2)
K: constant [Delta] S: requires transparent parts retardation reflection type liquid crystal panel newly generated in the, in order to obtain a good contrast throughout all display gradation to minimize the value of the leakage light sin 2 (ΔS / 2) There is. Usually, a contrast value necessary for recognizing a projected image as a good contrast requires a contrast of at least about 100. In the projection display of the display image of the liquid crystal panel 2, factors that influence the contrast may be the performance of the liquid crystal panel 2, the performance of the polarizing beam splitter 3, the performance of the projection lens 4, etc., but the image contrast is at least about 100. In order to obtain a degree of contrast, the contrast performance of various main parts is required to be at least about 300, which is three times as large as about 100.

そこで、偏光ビームスプリッタ起因のコントラストも最低でも３００程度必要である。偏光ビームスプリッタ起因コントラストを３００以上とするためには、洩れ光sin2(ΔS/2)を０．００３３以下に抑える必要がある。 Therefore, the contrast due to the polarizing beam splitter is also required to be at least about 300. In order to set the polarization beam splitter-induced contrast to 300 or more, it is necessary to suppress the leakage light sin 2 (ΔS / 2) to 0.0033 or less.

このとき、位相差ΔＳは、ほぼ、ΔＳ＜０．１………………（３） となる関係になる。 At this time, the phase difference ΔS is approximately in a relationship of ΔS <0.1 (3).

偏光ビームスプリッタ内で位相差が生じて洩れ光が生じても、コントラストを最低でも３００以上とするためには先に示した（１）式、および上記（３）式より、偏光ビームスプリッタに関する各定数の関係を（４）式に示す関係とする必要がある。 Even if leakage occurs due to a phase difference in the polarizing beam splitter, in order to make the contrast at least 300 or more, from the above-described equations (1) and (3), It is necessary to make the relationship between the constants as shown in the equation (4).

２π・Ｃ・Ｆ・Ｌ／λ＜０．１ ………………………………（４）
ただし、Ｃ：光透過部品材料の光弾性定数〔m2／Ｎ〕
Ｆ：光透過部品材料へ加わる応力〔Ｎ／m2〕
Ｌ：光透過部品の光透過長 〔ｍ〕
λ：光の波長 〔ｍ〕
すなわち、偏光ビームスプリッタにおけるコントラスト劣化を防止するには該ビームスプリッタの光弾性定数Ｃとそれに加わる応力Ｆ、該ビームスプリッタ内部を透過する光の透過長Ｌの積を式（４）のように規定することが有効である。 2π ・ C ・ F ・ L / λ <0.1 ………………………… (4)
Where C: photoelastic constant of light transmitting component material [m 2 / N]
F: Stress applied to the light transmissive component material [N / m 2 ]
L: Light transmission length of light transmission component [m]
λ: wavelength of light [m]
That is, in order to prevent the contrast degradation in the polarizing beam splitter, the product of the photoelastic constant C of the beam splitter, the stress F applied thereto, and the transmission length L of the light transmitted through the inside of the beam splitter is defined as shown in Equation (4) It is effective to do.

式（４）では位相差の関係を規定したが、光路差δを規定してもよい。すなわち、該偏光ビームスプリッタ使用時における該ビームスプリッタに加わる応力をＦ〔Pa〕、光が該ビームスプリッタ中を透過するときの該ビームスプリッタ中の光透過長をｄ〔cｍ〕、該ビームスプリッタの光弾性定数をβ〔nm/cm/105Pa〕としたとき、光路差δとしては式（５）の関係を満足させる必要がある。 Although the relationship between the phase differences is defined in Equation (4), the optical path difference δ may be defined. That is, the stress applied to the beam splitter when the polarizing beam splitter is used is F [Pa], and the light transmission length in the beam splitter when light is transmitted through the beam splitter is d [cm]. When the photoelastic constant is β [nm / cm / 10 5 Pa], the optical path difference δ needs to satisfy the relationship of the formula (5).

δ＝Ｆ×ｄ×β≦１２〔ｎｍ〕 ……… （５）
図１における光透過長Ｌとしては偏光分離面３−２で偏光分離後、該ビームスプリッタ３を出射するまでの光路長l／２、液晶パネル２で反射後再入射して投写レンズ４方向に再出射するまでの光路長ｌの合計（３l）／２となる。 δ = F × d × β ≦ 12 [nm] (5)
The light transmission length L in FIG. 1 is the optical path length l / 2 from the polarization separation surface 3-2 after the polarization separation to the exit from the beam splitter 3; The total optical path length l until re-emission is (3l) / 2.

図２は本発明偏光ビームスプリッタ、および該ビームスプリッタを適用した投写型映像表示装置である第２実施形態の光学系要部の模式断面図である。同図において、基本的に図１と同一の部品には図１の記号と同じ記号を付した。図２において、偏光ビームスプリッタ３は弾力性止め具１２を介してビームスプリッタ固定材１１に固定し、装置筐体９に固定している。なお、１０は投写レンズ固定材である。偏光ビームスプリッタ３の近傍には反射型液晶パネル２が配置してあり、該パネル２も該固定材１１に固定している。この構成で、偏光ビームスプリッタ３は弾力性止め具１２により取り付けられているので、該ビームスプリッタ３に加わる応力を非常に小さいものとすることが出来、偏光が該ビームスプリッタ３透過中に生ずる位相差を非常に小さいものとすることが出来る。なお、本実施例では偏光ビームスプリッタ３の該固定材１１と反射型液晶パネル２の該固定材１１は同一であるが、別個に構成してもよい。 FIG. 2 is a schematic cross-sectional view of the main part of the optical system of the second embodiment which is a polarizing beam splitter of the present invention and a projection display apparatus to which the beam splitter is applied. In this figure, the same reference numerals as those in FIG. 1 are given to the same components as those in FIG. In FIG. 2, the polarization beam splitter 3 is fixed to the beam splitter fixing material 11 via the elastic stopper 12 and fixed to the apparatus housing 9. Reference numeral 10 denotes a projection lens fixing material. A reflective liquid crystal panel 2 is disposed in the vicinity of the polarizing beam splitter 3, and the panel 2 is also fixed to the fixing material 11. In this configuration, since the polarizing beam splitter 3 is attached by the elastic stopper 12, the stress applied to the beam splitter 3 can be made extremely small, and the polarization is generated while being transmitted through the beam splitter 3. The phase difference can be made very small. In the present embodiment, the fixing material 11 of the polarizing beam splitter 3 and the fixing material 11 of the reflective liquid crystal panel 2 are the same, but may be configured separately.

図３は本発明偏光ビームスプリッタ、および該ビームスプリッタを適用した投写型映像表示装置である第３実施形態の光学系要部の模式断面図である。同図において、基本的に図２と同一の部品には図２の記号と同じ記号を付した。本第３実施形態の図２に示した第２実施形態に対しての主な違いは偏光ビームスプリッタ３と反射型液晶パネル２は両者の相互位置が変化しないように部分固定具１３で部分的に固定し、それら両者２、３を弾性止め具１２を介して固定材１１に固定し、該固定材１１を装置筐体９に取り付けた構成にある。 FIG. 3 is a schematic cross-sectional view of the main part of the optical system of the third embodiment, which is a polarizing beam splitter of the present invention and a projection display apparatus to which the beam splitter is applied. In this figure, basically the same parts as those in FIG. 2 are denoted by the same symbols as those in FIG. The main difference of the third embodiment from the second embodiment shown in FIG. 2 is that the polarization beam splitter 3 and the reflective liquid crystal panel 2 are partially fixed by a partial fixture 13 so that their mutual positions do not change. The two fixing members 11 are fixed to the fixing member 11 via the elastic stoppers 12, and the fixing member 11 is attached to the apparatus housing 9.

投写型映像表示装置が２板、３板構成など複数板構成の場合、液晶パネル２と偏光ビームスプリッタ３の相対位置の僅かな変化が画素ずれの原因になることがあるが、本第３実施形態構成は液晶パネル２と偏光ビームスプリッタ３の相対位置は変化しない構成であるので、複数板構成の投写型表示装置へ適用する場合に有効である。なお、本構成での注意点として、部分固定具１３の大きさ形状を工夫し、偏光ビームスプリッタ３の光が透過する内部にまで応力が加わらないようにする必要がある。具体的例の一つとしては偏光ビームスプリッタ３のコーナ部、エッジ部と反射型液晶パネル２との間に部分固定具１３を適用することが考えられる。 In the case where the projection display apparatus has a multi-plate configuration such as a two-plate or three-plate configuration, a slight change in the relative position of the liquid crystal panel 2 and the polarization beam splitter 3 may cause pixel shift. Since the relative configuration of the liquid crystal panel 2 and the polarization beam splitter 3 does not change, the configuration is effective when applied to a projection display apparatus having a plurality of plates. As a precaution in this configuration, it is necessary to devise the size and shape of the partial fixture 13 so that no stress is applied to the inside of the polarizing beam splitter 3 through which light passes. As a specific example, it is conceivable to apply a partial fixture 13 between the corner and edge of the polarizing beam splitter 3 and the reflective liquid crystal panel 2.

図４は本発明偏光ビームスプリッタ、および該ビームスプリッタを適用した投写型映像表示装置である第４実施形態の光学系要部の模式構成図である。同図において、基本的に図３と同一の部品には図３の記号と同じ記号を付した。本第４実施形態の図３に示した第３実施形態に対しての主な違いは反射型液晶パネル２−１、２−２、２−３を偏光ビームスプリッタ３の近傍に配置せず、ダイクロイックプリズム１４の周辺に配置した３板構成にある。透明部品透過中の偏光が位相差成分を変化させる現象は偏光ビームスプリッタ３中だけでなく、同じ透明部品であるダイクロイックプリズム１４中でもあり、投写画像の高コントラスト化のためには両者３、１４による位相差成分の変化を抑える必要がある。 FIG. 4 is a schematic configuration diagram of a main part of an optical system according to a fourth embodiment which is a polarizing beam splitter of the present invention and a projection display apparatus to which the beam splitter is applied. In this figure, the same reference numerals as those in FIG. 3 are given to the same components as those in FIG. The main difference of the fourth embodiment from the third embodiment shown in FIG. 3 is that the reflective liquid crystal panels 2-1, 2-2, 2-3 are not arranged in the vicinity of the polarization beam splitter 3, The three-plate configuration is arranged around the dichroic prism 14. The phenomenon in which the polarized light passing through the transparent part changes the phase difference component is not only in the polarization beam splitter 3 but also in the dichroic prism 14 which is the same transparent part. It is necessary to suppress changes in the phase difference component.

ダイクロイックプリズム１４と反射型液晶パネル２―１、２−２、２−３は両者の相互位置が変化しないように部分固定具１５で部分的に固定し、それら２−１、２−２、２−３と１４のブロックを弾力性止め具１６を介して固定部１８に取り付け固定した構造としている。また、偏光ビームスプリッタ３も弾力性止め具１７を介して固定部１８に取り付け固定している。このような構成により、経時変化による画素ずれ発生が抑制でき、また、偏光ビームスプリッタ３にもダイクロイックプリズム１４にも応力が加わりにくく、したがって、位相差状態の変化が発生しにくく、高コントラスト画面を得やすい投写型映像表示装置とすることが出来る。 The dichroic prism 14 and the reflective liquid crystal panels 2-1, 2-2, 2-3 are partially fixed by a partial fixture 15 so that their mutual positions do not change. -3 and 14 blocks are attached and fixed to the fixing portion 18 via the elastic stopper 16. Further, the polarization beam splitter 3 is also attached and fixed to the fixing portion 18 via the elastic stopper 17. With such a configuration, it is possible to suppress the occurrence of pixel shift due to changes over time, and it is difficult for stress to be applied to both the polarization beam splitter 3 and the dichroic prism 14, so that a change in phase difference state is unlikely to occur, and a high contrast screen is obtained. An easy-to-obtain projection display apparatus can be obtained.

図５は本発明偏光ビームスプリッタ、および該ビームスプリッタを適用した投写型映像表示装置である第５実施形態の上面の模式構成図である。また、図６は本発明偏光ビームスプリッタ、および該ビームスプリッタを適用した投写型映像表示装置である第５実施形態の光学系要部の模式構成図である。図５、図６において、図４と基本的に同一の部品には図４の記号と同じ記号を付した。本第５実施形態の図４に示した第４実施形態に対しての主な違いは第４実施形態では３枚の反射型液晶パネル２−１、２−２、２−３をダイクロイックプリズム１４の周辺に配置した３板構成であるのに対し、第５実施形態では３枚の反射型液晶パネル２−１、２−２、２−３のうちの、１枚の該液晶パネル２−１を第１の偏光ビームスプリッタ３１の側面に、他の２枚の該液晶パネル２−２、２−３を第２の偏光ビームスプリッタ３２の側面に配置し、それら偏光ビームスプリッタ３１、３２からの出射光をダイクロイックプリズム２４で合成している構成にある。この構成において、偏光ビームスプリッタ３１、３２の位相差ΔS、または光路差δをΔＳ＜０．１、または、光路差δ＜１２〔ｎｍ〕としている。 FIG. 5 is a schematic configuration diagram of the upper surface of the fifth embodiment, which is a polarizing beam splitter of the present invention and a projection display apparatus to which the beam splitter is applied. FIG. 6 is a schematic configuration diagram of an essential part of an optical system of a fifth embodiment which is a polarizing beam splitter of the present invention and a projection display apparatus to which the beam splitter is applied. 5 and 6, the same reference numerals as those in FIG. 4 are given to components that are basically the same as those in FIG. 4. The main difference of the fifth embodiment from the fourth embodiment shown in FIG. 4 is that in the fourth embodiment, three reflective liquid crystal panels 2-1, 2-2, 2-3 are connected to the dichroic prism 14. In the fifth embodiment, one of the three reflective liquid crystal panels 2-1, 2-2, and 2-3 is arranged in the periphery of the liquid crystal panel 2-1. Are arranged on the side surface of the first polarizing beam splitter 31, and the other two liquid crystal panels 2-2 and 2-3 are arranged on the side surface of the second polarizing beam splitter 32. The emitted light is synthesized by the dichroic prism 24. In this configuration, the phase difference ΔS or the optical path difference δ of the polarization beam splitters 31 and 32 is set to ΔS <0.1 or the optical path difference δ <12 [nm].

または、偏光ビームスプリッタ３１とダイクロイックプリズム２４の合計の位相差ΔＳ、または、光路差δ、および、偏光ビームスプリッタ３２とダイクロイックプリズム２４の合計の位相差ΔＳ、または、光路差δをΔＳ＜０．１、またはδ＜１２〔ｎｍ〕としている。このような設定により、投写型映像表示装置の高コントラスト化を図ることが出来る。 Alternatively, the total phase difference ΔS or optical path difference δ between the polarizing beam splitter 31 and the dichroic prism 24 and the total phase difference ΔS or optical path difference δ between the polarizing beam splitter 32 and the dichroic prism 24 are expressed as ΔS <0. 1, or δ <12 [nm]. With such a setting, it is possible to increase the contrast of the projection display apparatus.

図７は本発明の６実施形態で投写型映像表示装置内における偏光ビームスプリッタの支持取り付け状態説明図である。偏光ビームスプリッタ２５の上面、下面の両面に支持部品２６，２７を当接し、該支持部品２６、２７にほとんど歪を生じない、かつ、該ビームスプリッタが容易に位置変化しない適切、均一な支持力５０を加えて偏光ビームスプリッタ２５を支持固定している。 FIG. 7 is an explanatory diagram showing a state in which the polarization beam splitter is supported and attached in the projection display apparatus according to the sixth embodiment of the present invention. Supporting parts 26 and 27 are in contact with both the upper and lower surfaces of the polarizing beam splitter 25 so that the supporting parts 26 and 27 are hardly distorted, and the beam splitter does not easily change its position. The polarizing beam splitter 25 is supported and fixed by adding 50.

図８は本発明の７実施形態で投写型映像表示装置内における偏光ビームスプリッタの支持取り付け状態説明図である。偏光ビームスプリッタ２５の上面、下面の両面の周辺部に支持部品２８，２９を当接し、主に該ビームスプリッタの周辺部にのみ支持力５１が加わるようにし、光が通るビームスプリッタの中央部には歪がほとんどない状態にしている。 FIG. 8 is an explanatory view of a state in which the polarization beam splitter is supported and attached in the projection display apparatus according to the seventh embodiment of the present invention. The supporting components 28 and 29 are brought into contact with the peripheral portions of both the upper and lower surfaces of the polarizing beam splitter 25 so that the supporting force 51 is mainly applied only to the peripheral portion of the beam splitter, and the central portion of the beam splitter through which the light passes. Has almost no distortion.

図９は本発明の８実施形態で投写型映像表示装置内における偏光ビームスプリッタの支持取り付け状態説明図である。偏光ビームスプリッタ２５の下部の周辺部に支持部品４０を当接し、該支持部品をネジ４１で適切な締め付け力５２で締め付け固定している。この場合も、偏光ビームスプリッタ２５の光透過部分には大きな歪が発生せず、したがって透過光に大きな位相差が発生することはない。 FIG. 9 is an explanatory view showing a state in which the polarization beam splitter is supported and attached in the projection display apparatus according to the eighth embodiment of the present invention. The support component 40 is brought into contact with the lower peripheral portion of the polarization beam splitter 25, and the support component is fastened and fixed with a screw 41 with an appropriate tightening force 52. Also in this case, a large distortion does not occur in the light transmission portion of the polarization beam splitter 25, and therefore a large phase difference does not occur in the transmitted light.

図１０は本発明の９実施形態で投写型映像表示装置内における偏光ビームスプリッタの支持取り付け状態説明図である。偏光ビームスプリッタ３０の上面の端部をバネ性のある指示部品５５，５６で支持固している。５３は該上面端部に加える適切な支持力である。この場合も、偏光ビームスプリッタ２５の光透過部分には大きな歪が発生せず、したがって透過光に大きな位相差が発生することはない。以上において、支持部品２６、２７、２８、２９、４０を適切な弾性を有する材料から構成すると偏光ビームスプリッタの歪軽減に有効な場合があり、そのときは該支持部品を弾性材で形成する。 FIG. 10 is an explanatory diagram showing a state in which the polarization beam splitter is supported and attached in the projection display apparatus according to the ninth embodiment of the present invention. The end of the upper surface of the polarization beam splitter 30 is supported and fixed by spring indicating parts 55 and 56. 53 is an appropriate supporting force applied to the upper end portion. Also in this case, a large distortion does not occur in the light transmission portion of the polarization beam splitter 25, and therefore a large phase difference does not occur in the transmitted light. In the above, if the support parts 26, 27, 28, 29, and 40 are made of a material having appropriate elasticity, it may be effective in reducing the distortion of the polarizing beam splitter. In this case, the support parts are formed of an elastic material.

また、図７、図８、図９、図１０においては偏光ビームスプリッタの支持固定方
法について説明したが、他の光学部品の支持固定方法においても上記の支持固定
方法を適用できるものである。 7, 8, 9, and 10, the polarization beam splitter support and fixing method has been described. However, the above support and fixing method can also be applied to other optical component support and fixing methods.

また、以上において、偏光ビームスプリッタ、ダイクロイックプリズム等の位相差ΔＳ、または光路差δ、すなわち、光学部品の光弾性定数、それらに加わる応力、それらの中を光が透過するときの光透過長の積を規定したが、その他表示画像光にかかわる偏光が透過する部品を光路中に設けた場合はそれらについての位相差変化、光路差変化をも抑制出来るよう偏光が透過する部品の光弾性定数、それに加わる応力、それの中を光が透過するときの光透過長の積等からなる位相差ΔＳをほぼ０．１以下に、または光路差δをほぼ１２〔ｎｍ〕以下に規定する必要がある。また、該部品に加わる応力軽減のため弾性体等を利用しての支持固定が有効である。   Further, in the above, the phase difference ΔS or the optical path difference δ of the polarizing beam splitter, the dichroic prism, etc., that is, the photoelastic constant of the optical component, the stress applied to them, the light transmission length when light passes through them. Although the product has been defined, if other components that transmit polarized light related to display image light are provided in the optical path, the phase difference change for them, the photoelastic constant of the component that transmits polarized light so that the optical path difference change can also be suppressed, It is necessary to regulate the phase difference ΔS consisting of the stress applied to it, the product of the light transmission length when light passes through it, etc. to be approximately 0.1 or less, or the optical path difference δ to be approximately 12 [nm] or less. . In addition, support and fixing using an elastic body or the like is effective for reducing stress applied to the component.

本発明の投写型映像表示装置である第１実施形態の光学系要部の模式構成図である。It is a schematic block diagram of the principal part of the optical system of 1st Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第２実施形態の光学系要部の模式断面図である。It is a schematic cross section of an optical system principal part of a 2nd embodiment which is a projection type video display of the present invention. 本発明の投写型映像表示装置である第３実施形態の光学系要部の模式断面図である。It is a schematic cross section of the principal part of the optical system of 3rd Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第４実施形態の光学系要部の模式構成図である。It is a schematic block diagram of the principal part of the optical system of 4th Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第５実施形態の上面の模式構成図である。It is a schematic block diagram of the upper surface of 5th Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第５実施形態の光学系要部の模式構成図である。It is a schematic block diagram of the principal part of the optical system of 5th Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第６実施形態の偏光ビームスプリッタの支持取り付け状態説明図である。It is explanatory drawing of the support attachment state of the polarization beam splitter of 6th Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第７実施形態の偏光ビームスプリッタの支持取り付け状態説明図である。It is explanatory drawing of the support attachment state of the polarization beam splitter of 7th Embodiment which is a projection type video display apparatus of this invention. 本発明の投写型映像表示装置である第８実施形態の偏光ビームスプリッタの支持取り付け状態説明図である。It is a support attachment state explanatory view of the polarization beam splitter of an 8th embodiment which is a projection type video display of the present invention. 本発明の投写型映像表示装置である第９実施形態の偏光ビームスプリッタの支持取り付け状態説明図である。It is explanatory drawing of the support attachment state of the polarization beam splitter of 9th Embodiment which is a projection type video display apparatus of this invention.

符号の説明Explanation of symbols

１：光源、２：反射型液晶パネル、３：偏光ビームスプリッタ、３−１：光入射面、３−２：偏光分離面、３−３,３−４：光出射面、４：投写レンズ、５：光源からの出射光、６：液晶パネル入射光 、７：偏光ビームスプリッタ入射光、８：投写光、９：装置筐体、１０：投写レンズ固定材、１１：ビームスプリッタ固定材、１２,１６,１７：弾力性止め具、１３,１５：部分固定具、１４：ダイクロイックプリズム
1: Light source, 2: Reflective liquid crystal panel, 3: Polarizing beam splitter, 3-1: Light incident surface, 3-2: Polarized light separating surface, 3-3, 3-4: Light emitting surface, 4: Projection lens, 5: Light emitted from the light source, 6: Light incident on the liquid crystal panel, 7: Light incident on the polarizing beam splitter, 8: Projection light, 9: Apparatus housing, 10: Projection lens fixing material, 11: Beam splitter fixing material, 12, 16, 17: Resilient stopper, 13, 15: Partial fixture, 14: Dichroic prism

Claims (5)

光源と、
前記光源からの光のうち、表示画像光にかかわる偏光を透過させる光学部品と、
前記光学部品からの偏光を入射光として画像表示する反射型液晶パネルと、
前記パネルの表示画像を拡大投写するための投写レンズとを有する投写型映像表示装置であって、
前記光学部品に加わる応力をｆ〔Pa〕、光が前記光学部品中を透過するときの前記光学部品中の光透過長をｄ〔cｍ〕、前記光学部品の光弾性定数をβ〔nm/cm/105Pa〕としたとき、ｆ、ｄ、βが、
ｆ×ｄ×β≦１２〔ｎｍ〕
を満足する関係にあることを特徴とする投射型映像表示装置。 A light source;
Of the light from the light source, an optical component that transmits polarized light related to display image light; and
A reflective liquid crystal panel that displays an image of polarized light from the optical component as incident light;
A projection display device having a projection lens for enlarging and projecting a display image of the panel,
The stress applied to the optical component is f [Pa], the light transmission length in the optical component when light is transmitted through the optical component is d [cm], and the photoelastic constant of the optical component is β [nm / cm. / 10 5 Pa], f, d, β are
f × d × β ≦ 12 [nm]
A projection-type image display device characterized by satisfying the above relationship. 前記光学部品が偏光ビームスプリッタであることを特徴とする請求項１に記載の投射型映像表示装置。 The projection type image display device according to claim 1, wherein the optical component is a polarization beam splitter. 前記光学部品がダイクロイックプリズムであることを特徴とする請求項１に記載の投射型映像表示装置。 The projection type image display device according to claim 1, wherein the optical component is a dichroic prism. 光源と、
前記光源からの光を偏光にする偏光ビームスプリッタと、
前記ビームスプリッタからの偏光を入射光として画像表示する反射型液晶パネルと、
前記パネルの表示画像を拡大投写するための投写レンズを有する投写型映像表示装置であって、
前記偏光ビームスプリッタは、前記偏光ビームスプリッタに加わる応力をｆ〔Pa〕、光が前記偏光ビームスプリッタ中を透過するときの前記偏光ビームスプリッタ中の光透過長をｄ〔cｍ〕、前記偏光ビームスプリッタの光弾性定数をβ〔nm/cm/105Pa〕としたとき、ｆ、ｄ、βが、
ｆ×ｄ×β≦１２〔ｎｍ〕を満足する関係にあることを特徴とする投写型映像表示装置。 A light source;
A polarizing beam splitter that polarizes light from the light source;
A reflective liquid crystal panel for displaying an image of polarized light from the beam splitter as incident light;
A projection display apparatus having a projection lens for enlarging and projecting a display image of the panel,
The polarizing beam splitter has a stress applied to the polarizing beam splitter as f [Pa], a light transmission length in the polarizing beam splitter when light passes through the polarizing beam splitter, and d (cm). When the photoelastic constant of β is [nm / cm / 10 5 Pa], f, d, and β are
A projection display apparatus characterized by satisfying a relationship of f × d × β ≦ 12 [nm]. 前記偏光ビームスプリッタを、弾力性のある固定支持手段を介して装置内に固定したことを特徴とする請求項４に記載の投写型映像表示装置。
5. The projection display apparatus according to claim 4, wherein the polarizing beam splitter is fixed in the apparatus through an elastic fixing support means.
JP2005255822A 2005-09-05 2005-09-05 Projection video display device Pending JP2006023776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005255822A JP2006023776A (en) 2005-09-05 2005-09-05 Projection video display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005255822A JP2006023776A (en) 2005-09-05 2005-09-05 Projection video display device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2000115780A Division JP2001296514A (en) 2000-04-11 2000-04-11 Projection type image display device

Publications (1)

Publication Number Publication Date
JP2006023776A true JP2006023776A (en) 2006-01-26

Family

ID=35797034

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005255822A Pending JP2006023776A (en) 2005-09-05 2005-09-05 Projection video display device

Country Status (1)

Country Link
JP (1) JP2006023776A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102591020A (en) * 2011-01-12 2012-07-18 上海丽恒光微电子科技有限公司 Projection system
DE112017002429T5 (en) 2016-05-10 2019-01-24 Olympus Corporation Electronic circuit unit, imaging unit, imaging module and endoscope

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105639U (en) * 1980-12-18 1982-06-29
JPS57130807U (en) * 1981-02-06 1982-08-14
JPS62191809U (en) * 1986-05-26 1987-12-05
JPS63185114U (en) * 1987-05-21 1988-11-29
JPH05341253A (en) * 1992-06-09 1993-12-24 Hitachi Ltd Projection type reflection display device
JPH0954213A (en) * 1995-03-06 1997-02-25 Nikon Corp Projection type display device
JPH09127461A (en) * 1995-10-31 1997-05-16 Nikon Corp Projection type display device and optical element used in this device
JPH1073814A (en) * 1996-08-30 1998-03-17 Pioneer Electron Corp Projection type picture display device
JPH11160656A (en) * 1997-11-26 1999-06-18 Nikon Corp Projection display device
JPH11233858A (en) * 1998-02-10 1999-08-27 Komatsu Ltd Eximer laser, fixing means and fixing method for optical part thereof

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105639U (en) * 1980-12-18 1982-06-29
JPS57130807U (en) * 1981-02-06 1982-08-14
JPS62191809U (en) * 1986-05-26 1987-12-05
JPS63185114U (en) * 1987-05-21 1988-11-29
JPH05341253A (en) * 1992-06-09 1993-12-24 Hitachi Ltd Projection type reflection display device
JPH0954213A (en) * 1995-03-06 1997-02-25 Nikon Corp Projection type display device
JPH09127461A (en) * 1995-10-31 1997-05-16 Nikon Corp Projection type display device and optical element used in this device
JPH1073814A (en) * 1996-08-30 1998-03-17 Pioneer Electron Corp Projection type picture display device
JPH11160656A (en) * 1997-11-26 1999-06-18 Nikon Corp Projection display device
JPH11233858A (en) * 1998-02-10 1999-08-27 Komatsu Ltd Eximer laser, fixing means and fixing method for optical part thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102591020A (en) * 2011-01-12 2012-07-18 上海丽恒光微电子科技有限公司 Projection system
DE112017002429T5 (en) 2016-05-10 2019-01-24 Olympus Corporation Electronic circuit unit, imaging unit, imaging module and endoscope
US10610090B2 (en) 2016-05-10 2020-04-07 Olympus Corporation Electronic circuit unit, imaging unit, imaging module, and endoscope

Similar Documents

Publication Publication Date Title
JP6083997B2 (en) Projection display
US7255444B2 (en) Optical unit and projection-type image display apparatus using the same
US7518662B2 (en) Contrast enhancement for liquid crystal based projection systems
JP4309177B2 (en) Projection display using wire grid polarization beam splitter with compensator
JP5767433B2 (en) Projection type image display device
US6179423B1 (en) Projection-type image display system
US6536903B2 (en) System and method for improving contrast in an electro-optical imaging system
JP2003222724A (en) 1/4 wavelength plate, optical unit and reflection liquid crystal display using the same
US8089442B2 (en) Image projection apparatus
WO2007021981A2 (en) Contrast enhancement for liquid crystal based projection systems
JP2006023776A (en) Projection video display device
JP4096356B2 (en) Projector and phase difference plate arrangement method
JP5444641B2 (en) Image display device and adjustment method thereof
KR100401106B1 (en) Apparatus for projection display by using reflective LCD
JP2001296514A (en) Projection type image display device
JP4967253B2 (en) Optical device and projection device
JP2012159784A (en) Liquid crystal image display device
US20050180030A1 (en) Optical projection system and method
KR20040046137A (en) Projection system with reflective type liquid crystal display device
JP2005106940A (en) Reflection type polarizer and image display device
JP2013007953A (en) Image display unit and method for adjusting voltage applied thereto
JP2001209024A (en) Projection type display device
JP2005134814A (en) Image display device
JP2005284265A (en) Reflection type liquid crystal display device and projection apparatus
JP2004302343A (en) Projection display device

Legal Events

Date Code Title Description
RD01 Notification of change of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7421

Effective date: 20060421

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070402

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100601

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100728

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100914

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110125