JPS63116123A - Projection type color display device - Google Patents
Projection type color display deviceInfo
- Publication number
- JPS63116123A JPS63116123A JP61263277A JP26327786A JPS63116123A JP S63116123 A JPS63116123 A JP S63116123A JP 61263277 A JP61263277 A JP 61263277A JP 26327786 A JP26327786 A JP 26327786A JP S63116123 A JPS63116123 A JP S63116123A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- blue
- green
- mirror
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 39
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 abstract description 5
- 150000002367 halogens Chemical class 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002496 gastric effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
Landscapes
- Liquid Crystal (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、画像形成のための液晶ライトバルブを複数枚
用い、投写して画像表示を行なう投写塵カラー表示装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection dust color display device that uses a plurality of liquid crystal light valves for image formation and displays images by projecting the images.
従来、複数枚の液晶ライトバルブを用いた投写型カラー
表示装置は、５ＩＤ１８６ダイジ工スト発表番号２０．
４に記載されるように、白色光を十字状に組み合わせた
ダイクロイックミラー系で、三原色の赤、緑伊冑の色光
に分離し、その色光を液晶ライトバルブにて画像変調し
、各色光をダイクロイックプリズムで合成し、投写レン
ズで投写するものがあった。Conventionally, a projection type color display device using a plurality of liquid crystal light valves is disclosed in 5ID186 Daiji Industries Publication No. 20.
4, a dichroic mirror system in which white light is combined in a cross shape is used to separate the three primary colors of red and green light, image-modulated by a liquid crystal light valve, and each color light is converted into a dichroic mirror system. There was one that combined images using a prism and projected them using a projection lens.
しかし、前述の従来技術では、完全な平光光線の投写光
源の実現が困難で、光源からの距離が大きくなるにつれ
減衰が大きくなる０前例では緑色光に比べ赤色光、青色
光の光源から液晶ライトバルブまでの距離が大きいため
、加えて反射ミラーによシ、赤色光及び青色光の減衰が
大きく、緑色光をＮＤフィルター等によシ減衰させ、色
パフンスをとらなくてはならず、結果的に暗い画像表示
となる。また偏光板や液晶バネ〃の透過率の波長依存性
は、第６図のように短波長側で落ち込むことや、ハロゲ
ン電球等の色温度の低い光源（フー！ドミヲー付）は、
第７図のように長波長側の光強度が短波長側に比べ大き
くなる。このようなことから、青色光の光強度によって
投写型カラー表示装置全体の画像の明るさが決定され、
青色光が弱いと暗い画像表示となってしまうという問題
点を有する。However, with the above-mentioned conventional technology, it is difficult to realize a perfect flat beam projection light source, and as the distance from the light source increases, the attenuation increases. Because the distance to the bulb is large, in addition, red light and blue light are attenuated greatly by the reflecting mirror, and green light must be attenuated by an ND filter, etc., to obtain color puffiness. The image will appear dark. In addition, the wavelength dependence of the transmittance of polarizing plates and liquid crystal springs decreases on the short wavelength side as shown in Figure 6, and light sources with low color temperature such as halogen light bulbs (with Fu! Domio)
As shown in FIG. 7, the light intensity on the long wavelength side is greater than on the short wavelength side. For this reason, the brightness of the entire image of the projection type color display device is determined by the light intensity of the blue light.
There is a problem that if the blue light is weak, the image will be displayed darkly.
そこで本発明は、このような問題点を解決するもので、
その目的とするところは、青色光について、液晶フイト
パルプと投写光源との距離を最小にし、反射による減衰
を押さえ、青色表示画像を最も明かるいものにし、全体
として明るいカラー画像表示を提供するところにある。Therefore, the present invention aims to solve these problems.
The purpose of this is to minimize the distance between the liquid crystal phytopulp and the projection light source for blue light, suppress attenuation due to reflection, make the blue display image the brightest, and provide an overall bright color image display. be.
本発明の投写型カフ−表示装置は、画像形成のための三
枚の液晶フイトパルプと、光の三原色への色分離を行な
うダイクロイックミラー基と、画像合成のためのダイク
ロイックプリズムと、投写光源及び投写レンズからなる
、投写型カラー表示装置において、前記液晶ライトバル
ブのうち、青色液晶ライトバルブを前記投写光源に対し
、距離が最も短かくなるように配置したことを特徴とす
る０
〔作用〕
減衰及び絶対光量の少ない青色光の、液晶ライトバルブ
と投写光源との距離を最も近づけることで、青色光の光
量で決定される投写型カラー表示装置の明かるさを大き
くすることができる。The projection type cuff-display device of the present invention comprises three sheets of liquid crystal phytopulp for image formation, a dichroic mirror group for separating light into three primary colors, a dichroic prism for image synthesis, a projection light source, and a projection light source. A projection type color display device comprising a lens, characterized in that among the liquid crystal light valves, a blue liquid crystal light valve is arranged so as to have the shortest distance from the projection light source. By bringing the distance between the liquid crystal light valve and the projection light source closest to each other for blue light, which has a small absolute amount of light, it is possible to increase the brightness of the projection color display device, which is determined by the amount of blue light.
以下、本発明の一実施例を図面に沿りて説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明の投写型カラー表示装置の平面図であ
る。ハロゲンランプ等の投写光源１から発した白色光は
、放物ミラー２により集光され、熱線カットフィルター
３により赤外域の熱線をカットし、可視光のみがダイク
ロイックミラー基に入射する。まず、青色反射ダイクワ
イツクミツ−４によυ、青色光（おおむねｓｏｏ（ｎｍ
）以下の波長の光）を反射し、その池の光（黄色光）を
透過する。反射した青色光は、反射ミラー６により方向
を変え、青色変調液晶ライトバルブ７Ｂに入射する。FIG. 1 is a plan view of a projection type color display device of the present invention. White light emitted from a projection light source 1 such as a halogen lamp is collected by a parabolic mirror 2, heat rays in the infrared region are cut by a heat ray cut filter 3, and only visible light enters the dichroic mirror base. First, blue light (approximately soo (nm)
) and transmits light (yellow light) from the pond. The reflected blue light changes direction by the reflection mirror 6 and enters the blue modulation liquid crystal light valve 7B.
青色反射ダイクロイックミラー４を透過した光は、緑色
反射ダイクロイックミラー５に入射し、緑色光（おおむ
ねｓｏｏ（ｎｍ）から６００（ｎｍ〕の間の波長の光）
を仄射し、その他の光である赤色光（おおむね６００（
ｎｍ）以上の波長の光）を透過する。The light that has passed through the blue reflective dichroic mirror 4 enters the green reflective dichroic mirror 5, where it emits green light (light with a wavelength approximately between soo (nm) and 600 (nm)).
, and other light, red light (approximately 600 (
Transmits light with a wavelength of nm) or longer.
反射した緑色光は、緑色変調液晶ライトバルブ７Ｇに入
射する。The reflected green light enters the green modulation liquid crystal light valve 7G.
緑色反射グイクロイックミラー５を透過した赤色光は、
反射ミラー６により方向を変え、赤色変調液晶ブイドパ
〜プ７Ｒに入射する。The red light transmitted through the green reflecting mirror 5 is
The direction of the light is changed by the reflection mirror 6, and the light enters the red modulation liquid crystal display panel 7R.
第２図は、青色反射ダイクワイツクミツ−４、及び緑色
反射グイクロイックミラ−５の波長特性図でちる。FIG. 2 is a wavelength characteristic diagram of the blue reflective dichroic mirror 4 and the green reflective dichroic mirror 5.
赤、緑、青の各色用の信号が加えられた各液晶ライトバ
ルブ７Ｒｔ７Ｇ１７Ｂで、入射した各色光は変調され、
ダイクロイックプリズム８で、合成される。ダイクロイ
ックプリズム８は、赤反射面８Ｒと、青ズ射面８Ｂを互
いに直角になるように構成されている。第３図はダイク
ロイックプリズム８の斜視図である。直角プリズムの直
角をはさむ面に反射面を蒸着し、光学接着剤で、４つの
直角プリズムをはり合わせたものである。ここでこのダ
イクロイックプリズム８は、同様の反射面を有する赤色
ダイクロイックミラーと胃色ダイクロイックミラーを十
字状に組み合わせて用いても差しつかえない。The incident color light is modulated by each liquid crystal light valve 7Rt7G17B to which signals for each color of red, green, and blue are added.
The dichroic prism 8 synthesizes the images. The dichroic prism 8 is configured such that the red reflecting surface 8R and the blue emitting surface 8B are perpendicular to each other. FIG. 3 is a perspective view of the dichroic prism 8. Reflective surfaces are deposited on the sides of the right angle prisms, and four right angle prisms are glued together using optical adhesive. Here, the dichroic prism 8 may be a cross-shaped combination of a red dichroic mirror and a stomach-colored dichroic mirror having similar reflective surfaces.
こうして合成されたカラー画像は、投写レンズ９により
て拡大投写され、スクリーン上に表示される。The color image thus synthesized is enlarged and projected by the projection lens 9 and displayed on the screen.
この時、胃色度調液晶ライトバルブ７Ｂと緑色変調液晶
ライトバルブ７Ｇと投写光源１との距離が等しくなシ、
赤色度調液晶うイドパμプ７Ｒとの距離が長くなる。肯
色光、緑色光に比べて、赤色光は減衰が大きく、色温度
の低い投写光源１を用いた場合に、光源自体の赤色光の
エネルギーの強さが減衰され、表示されることになり、
表示画像の色温度は高くなシ、色バランスをとるための
フィルター等を必要とせずに、できる。At this time, if the distances between the gastric chromaticity adjustment liquid crystal light valve 7B, the green modulation liquid crystal light valve 7G, and the projection light source 1 are not equal,
The distance from the red tone liquid crystal liquid crystal display 7R becomes longer. Compared to positive color light and green light, red light has a large attenuation, and when a projection light source 1 with a low color temperature is used, the intensity of the energy of the red light of the light source itself is attenuated and displayed.
The color temperature of the displayed image is not high, and it can be done without the need for a filter or the like to balance the colors.
第４図は本発明の他の実施例を示す平面図であるＯ
第１図の投写型カラー表示装置と同様な構成でおるが、
青色変調液晶ライトバルブ７Ｂ、緑色変調液晶ライドパ
μプ７Ｇ、赤色変調液晶フイトバμブ７Ｒの順に投写光
源１からの距離が長くなっている。FIG. 4 is a plan view showing another embodiment of the present invention. It has the same configuration as the projection type color display device shown in FIG.
The distance from the projection light source 1 increases in the order of the blue modulation liquid crystal light valve 7B, the green modulation liquid crystal light valve 7G, and the red modulation liquid crystal light bulb 7R.
前述の実施例同様に、投写光源１から発した白色光は、
放物ミラー２により集光され、熱線カットフイμター３
により赤外域の熱線をカットし、可視光のみがダイクロ
イックミツ−基に入射すムまず、黄色反射ダイクロイッ
クミツ−１０で、黄色光（おおむね５００（ｎｍ）以上
の波長の光）を反射し、残る置き光は透過し、青色変調
液晶ライトバルブ７Ｂに入射する。黄色反射グイクロイ
ックミラー１０の特性は第２図に示す。黄色光は反射ミ
ツ−６で反射し方向を変え、緑色反射ダイクロイックミ
ラー５に入射し、緑色光は反射し、緑色父調液晶うイド
パμグアＧに入射する。透過する赤色光は、反射ミラー
６に導かれ、赤色変調液晶ライドパμグアＲに入射する
。Similar to the previous embodiment, the white light emitted from the projection light source 1 is
The light is focused by a parabolic mirror 2 and passed through a heat ray cut filter 3
The heat rays in the infrared region are cut, and only the visible light enters the dichroic base.First, the yellow reflective dichroic base 10 reflects the yellow light (light with a wavelength of approximately 500 (nm) or more) and remains. The light passes through and enters the blue modulation liquid crystal light valve 7B. The characteristics of the yellow reflective gicchroic mirror 10 are shown in FIG. The yellow light is reflected by the reflector 6, changes its direction, and enters the green reflecting dichroic mirror 5, and the green light is reflected and enters the green dichroic liquid crystal liquid crystal G. The transmitted red light is guided by the reflection mirror 6 and enters the red modulation liquid crystal Ride PAG R.
以後は、前述の実施例同様に、各色光は、各色ごとく変
調され、ダイクロイックプリズム８で合成され、投写レ
ンズ９にて投写され、画像表示を！
行なう。Thereafter, as in the previous embodiment, each color light is modulated, combined by the dichroic prism 8, and projected by the projection lens 9 to display an image! Let's do it.
第５図は、本発明の他の実施例を示す平面図である。各
色の変調液晶ライドパルプと投写光源１との距離は、第
２の実施例と同様である０色分離の方法としては、第１
の実施例と同様であり、青色反射ダイクロイックミツ−
４で、青色光を反射分離し、緑色反射ダイクロイックミ
ラー５で、緑色光を反射分離し、残りの色光を赤色光と
して、各色変調液晶フイ） ／＜μプに入射している０
集光し、熱線をカットするのも前述の実施例と同様で、
ダイクロイックプリズム８と投写レンズ９で、カラー画
像を合成し、投写表示を行なうことも同様である０
第６図は、液晶バネμ及び偏光板の波長特性図で、両方
とも青色光領砿での透過率の低下が認められる。第７図
は一般的なハロゲン電球の二ネμギーを示す波長特性図
で、青色光領域の絶対量が少なくなりている。FIG. 5 is a plan view showing another embodiment of the invention. The distance between the modulated liquid crystal ride pulp of each color and the projection light source 1 is the same as in the second embodiment.
It is similar to the embodiment of
4, the blue light is reflected and separated, the green reflecting dichroic mirror 5 reflects and separates the green light, and the remaining color light is converted into red light. , cutting the hot wire is the same as in the previous example,
Similarly, the dichroic prism 8 and the projection lens 9 combine color images and perform projection display.0 Figure 6 shows the wavelength characteristics of the liquid crystal spring μ and the polarizing plate, both of which are used in the blue light range. A decrease in transmittance is observed. FIG. 7 is a wavelength characteristic diagram showing the second energy of a general halogen light bulb, in which the absolute amount of light in the blue light region is small.
以上述べたように、本発明によれば、青色光の光の強さ
によシ、カラー表示画像の明かるさが決められるため、
絶対量が少なく、透過等による減衰の最も多い青色光の
光路長を短かくすることによシ、青色光の表示の明るさ
を増大することが可能で、全体としてカラー表示画像を
明るい表示とすることが可能であるといりた効果を有す
る。As described above, according to the present invention, the brightness of a color display image is determined depending on the intensity of blue light.
By shortening the optical path length of blue light, which has a small absolute amount and is most attenuated due to transmission etc., it is possible to increase the brightness of the blue light display, making the color display image brighter as a whole. It has the advantage that it is possible to
第１図は本発明の投写型カラー表示装置の一実施例を示
す平面図である。
第２図はダイクロイックミツ−の波長特性図でオリ、第
３図はダイクロイックプリズムの斜視図である。
第４図及び第５図は、本発明の他の実施例を示す平面図
である。
第６図は、液晶バネμ及び偏光板の透過率を示す波長特
性図である。
第７図は、一般的なハロゲン電球の二ネμギーの波長特
性図である。
１−−−−−・投写光源
２−・−放物ミツ−
３・・・・・・熱線カットフィルター
４−・−・青色反射ダイクロイックミラー５−−・−緑
色反射ダイクロイックミツ−６・・・−・反射ミラー
７ Ｂ−・・青色変調液晶ライトバルブ７Ｇ・・・緑色
変調液晶ライトバルブ
７Ｒ−・赤色変調液晶ライトバルブ
８・・・−・ダイクロイックプリズム
？ −−・・・投写レンズ
１０・・・−・黄色反射ダイクロイックミヲー以上
第２図
纂４図
第５図FIG. 1 is a plan view showing an embodiment of a projection type color display device of the present invention. FIG. 2 is a wavelength characteristic diagram of a dichroic prism, and FIG. 3 is a perspective view of a dichroic prism. FIGS. 4 and 5 are plan views showing other embodiments of the present invention. FIG. 6 is a wavelength characteristic diagram showing the transmittance of the liquid crystal spring μ and the polarizing plate. FIG. 7 is a two-μg wavelength characteristic diagram of a general halogen light bulb. 1-----Projection light source 2--Parabolic light source 3--Heat ray cut filter 4--Blue reflective dichroic mirror 5--Green reflective dichroic mirror 6... -Reflection mirror 7 B-...Blue modulation liquid crystal light valve 7G...Green modulation liquid crystal light valve 7R--Red modulation liquid crystal light valve 8...-Dichroic prism? ---...Projection lens 10...--Yellow reflective dichroic miwo Figure 2 Figure 4 Figure 5
Claims (1)
色への色分離を行なうダイクロイックミラー系と、画像
合成のためのダイクロイックプリズムと、投写光源及び
投写レンズからなる投写型カラー表示装置において、前
記液晶ライトバルブのうち、青色液晶ライトバルブを前
記投写光源に対し、距離が最も短くなるように配置した
ことを特徴とする、投写型カラー表示装置。In a projection type color display device consisting of three liquid crystal light valves for image formation, a dichroic mirror system for separating light into three primary colors, a dichroic prism for image synthesis, a projection light source and a projection lens, A projection type color display device, characterized in that, among the liquid crystal light valves, a blue liquid crystal light valve is arranged so as to have the shortest distance from the projection light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61263277A JP2537607B2 (en) | 1986-11-05 | 1986-11-05 | Projection color display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61263277A JP2537607B2 (en) | 1986-11-05 | 1986-11-05 | Projection color display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63116123A true JPS63116123A (en) | 1988-05-20 |
| JP2537607B2 JP2537607B2 (en) | 1996-09-25 |
Family
ID=17387226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61263277A Expired - Lifetime JP2537607B2 (en) | 1986-11-05 | 1986-11-05 | Projection color display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2537607B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994022042A1 (en) * | 1993-03-16 | 1994-09-29 | Seiko Epson Corporation | Projection type display device |
| US5390048A (en) * | 1991-12-02 | 1995-02-14 | Matsushita Electric Industrial Co., Ltd. | Projection lens assembly and projection display apparatus |
| US6174060B1 (en) | 1997-08-26 | 2001-01-16 | Victor Company Of Japan, Ltd. | Projection-type display apparatus having polarized beam splitters and an illuminating device |
| US6176583B1 (en) | 1998-06-22 | 2001-01-23 | Minolta Co., Ltd. | Polarization conversion dichroic mirror and a liquid crystal projector |
| US6231192B1 (en) | 1998-06-23 | 2001-05-15 | Minolta Co., Ltd. | Projecting optical system |
| US6457832B1 (en) | 1999-02-19 | 2002-10-01 | Canon Kabushiki Kaisha | Illumination apparatus and projection apparatus compensating for transverse aberration at an illumination surface |
| US6513934B1 (en) | 1999-02-17 | 2003-02-04 | Canon Kabushiki Kaisha | Projection apparatus and observation apparatus |
| US6634755B1 (en) | 1999-02-17 | 2003-10-21 | Canon Kabushiki Kaisha | Illuminating device and projector |
| JP2007193316A (en) * | 2006-01-19 | 2007-08-02 | Samsung Electro Mech Co Ltd | Projection system employing semiconductor diode |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61102626A (en) * | 1984-10-25 | 1986-05-21 | Sony Corp | Negative-positive converter |
| JPS639396A (en) * | 1986-06-30 | 1988-01-16 | Sony Corp | Projection type color image display device |
-
1986
- 1986-11-05 JP JP61263277A patent/JP2537607B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61102626A (en) * | 1984-10-25 | 1986-05-21 | Sony Corp | Negative-positive converter |
| JPS639396A (en) * | 1986-06-30 | 1988-01-16 | Sony Corp | Projection type color image display device |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5539579A (en) * | 1991-12-02 | 1996-07-23 | Matsushita Electric Industrial Co., Ltd. | Projection lens assembly and projection display apparatus |
| US5390048A (en) * | 1991-12-02 | 1995-02-14 | Matsushita Electric Industrial Co., Ltd. | Projection lens assembly and projection display apparatus |
| US6309073B1 (en) | 1993-03-16 | 2001-10-30 | Seiko Epson Corporation | Projector |
| US5626409A (en) * | 1993-03-16 | 1997-05-06 | Seiko Epson Corporation | Projection-type display apparatus |
| USRE36850E (en) * | 1993-03-16 | 2000-09-05 | Seiko Epson Corporation | Projection-type display apparatus |
| US6120152A (en) * | 1993-03-16 | 2000-09-19 | Seiko Epson Corporation | Projection-type display apparatus |
| WO1994022042A1 (en) * | 1993-03-16 | 1994-09-29 | Seiko Epson Corporation | Projection type display device |
| US6174060B1 (en) | 1997-08-26 | 2001-01-16 | Victor Company Of Japan, Ltd. | Projection-type display apparatus having polarized beam splitters and an illuminating device |
| US6176583B1 (en) | 1998-06-22 | 2001-01-23 | Minolta Co., Ltd. | Polarization conversion dichroic mirror and a liquid crystal projector |
| US6231192B1 (en) | 1998-06-23 | 2001-05-15 | Minolta Co., Ltd. | Projecting optical system |
| US6513934B1 (en) | 1999-02-17 | 2003-02-04 | Canon Kabushiki Kaisha | Projection apparatus and observation apparatus |
| US6634755B1 (en) | 1999-02-17 | 2003-10-21 | Canon Kabushiki Kaisha | Illuminating device and projector |
| US6457832B1 (en) | 1999-02-19 | 2002-10-01 | Canon Kabushiki Kaisha | Illumination apparatus and projection apparatus compensating for transverse aberration at an illumination surface |
| JP2007193316A (en) * | 2006-01-19 | 2007-08-02 | Samsung Electro Mech Co Ltd | Projection system employing semiconductor diode |
| US8002412B2 (en) | 2006-01-19 | 2011-08-23 | Samsung Led Co., Ltd. | Projection system employing semiconductor diode |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2537607B2 (en) | 1996-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |