JP3706001B2 - Display device and image projection method - Google Patents

Description

【００４２】
ｎ＝１６の場合、この式に基づく分布で減衰された重畳部分における各画像７Ａ，７Ｂの明るさおよび大画像８の明るさは図３に示すようになる。また、この大画像８における重畳部分の明るさの１次微分値および２次微分値は図４に示すようになり、１次微分値の絶対値が０．５以下になり、２次微分値の絶対値が約０．３５以下になる。
【００４３】
次に、テープ６Ａ，６Ｂの配置について説明する。
テープ６Ａ，６Ｂは、濃淡の方向が画像７Ａ，７Ｂの配列方向に合わせられ、リール１２により引き張りした状態で配置される。また、大画像８を表示する際には所定の第２の分布の透過率を有する部分１１Ａが光路上に配置され、個々の画像の明るさの調整を実行する場合には、透明な部分１１Ｂが光路上に配置される。
【００４４】
そして、画像７Ａ，７Ｂの配列方向におけるテープ６Ａ，６Ｂの位置調整は、リール１２およびテープ６Ａ，６Ｂ全体を図示せぬ機構により移動させることにより実行され、それに対して垂直な方向におけるテープ６Ａ，６Ｂの位置調整は、リール１２の巻回の度合いで実行される。また、テープ６Ａ，６Ｂが固定されるリール１２の軸を可動とし、テープ６Ａ，６Ｂを画像７Ａ，７Ｂの配列方向に移動させるようにしてもよい。
【００４５】
なお、テープ６Ａ，６Ｂの透過率の第２の分布をテープ６Ａ，６Ｂの長手方向に形成するようにしてもよく、その場合には、画像７Ａ，７Ｂの配列方向におけるテープ６Ａ，６Ｂの位置調整はリール１２の巻回の度合いで実行され、それに対して垂直な方向におけるテープ６Ａ，６Ｂの位置調整は、リール１２およびテープ６Ａ，６Ｂ全体を図示せぬ機構により移動させることにより実行される。
【００４６】
以上のように、この実施の形態１によれば、各画像に対応する各画像信号のうちの、隣接する画像との重畳部分の明るさを電気的に微調整し、微調整した複数の画像信号に対応する画像を投影し、隣接する画像との重畳部分の明るさを所定の滑らかな分布で光学的に減衰させて重畳部分の明るさを平滑するようにしたので、重畳部分の明るさの分布を正確に目標分布に合わせることができるという効果が得られる。
【００４７】
また、この実施の形態１によれば、例えば式（１）に基づき、所定の滑らかな分布を、重畳部分において所定の次数まで（今の場合、２次まで）の微分値がそれぞれ所定の範囲内である分布としたので、重畳部分における明るさの分布を確実に滑らかにすることができるという効果が得られる。特に、式（１）のように２の平方根の平方根の累乗に基づいて分布を選択することにより、２次微分値を低くすることができる。すなわち、各微分値の絶対値が小さくなると連続性が高くなるとともに滑らかな輝度変化となるので、輝度段差が認識されにくくなる。
【００４８】
さらに、この実施の形態１によれば、光学的調整手段として所定の滑らかな分布の透過率を有するテープ６Ａ，６Ｂを使用したので、配置を簡単に調整することができるとともに、スクリーン５のサイズや位置などの変更に応じて透過率の分布を変更したい場合にテープ６Ａ，６Ｂを交換すればよく、簡単に装置の設定変更を実行することができるという効果が得られる。また、同一のテープを複数作成して裏返してテープ６Ａとテープ６Ｂとのいずれかとして使用することで、透過率分布が互いに反転した関係にあるテープ６Ａ，６Ｂを精度良く簡単に作成することができるとともに、量産にも向くという効果が得られる。
【００４９】
さらに、この実施の形態１によれば、光学的調整手段として所定の滑らかな分布の透過率で染料を表面に印刷した、または内部に分散したフレネルレンズ４Ａ，４Ｂを使用したので、従来の製造技術に基づいて簡単かつ安価で所望の透過率分布の光学的調整手段を実現することができるという効果が得られる。
【００５０】
さらに、この実施の形態１によれば、テープ６Ａ，６Ｂに透過率の分布の異なる複数の部分を設けたので、透明な部分を設ければ個々の画像の明るさの調整を簡単に実行することができ、異なる滑らかな分布の部分を設ければ、スクリーン５のサイズや位置などの変更に応じて透過率の分布を簡単に変更することができるという効果が得られる。
【００５１】
さらに、この実施の形態１によれば、テープ６Ａ，６Ｂを光路上において可動な状態で配置しているので、透過率分布と重畳部分との位置関係を簡単に調整することができるという効果が得られる。
【００５２】
なお、光学的調整手段として、染料を印刷したフレネルレンズ４Ａ，４Ｂやテープ６Ａ，６Ｂといった減光手段を使用したが、光学的インテンシファイヤなどの増光手段を使用してもよく、また、ライトバルブではなくて透明基板への印刷または色素の分散で減光してもよく、同等の効果が得られる。さらに、平滑装置２での処理はハードウェア処理として実現してもよく、ソフトウェア処理として実現してもよい。
【００５３】
実施の形態２．
この発明の実施の形態２によるディスプレイ装置は、テープ６Ａ，６Ｂなどの光学的調整手段における透過率の分布を目標分布から所定の距離（実施の形態２では０．５画素程度）だけ画像端の方向にずらした分布としたものである。なお、このようにするには、例えば実施の形態１におけるテープ６Ａ，６Ｂをその所定の距離だけ移動させればよい。なお、その他の構成要素については実施の形態１によるものと同様であるので、その説明を省略する。
【００５４】
次に動作について説明する。
図５は画素の出力分布、平滑装置２による電気的調整分布、光学系調整手段による光学的調整分布および目標分布の関係を示す図である。図６は実施の形態２によるディスプレイ装置での、重畳部分における２つの画像および大画像の明るさの分布の一例を示す図である。
【００５５】
この実施の形態２においては、例えば図５に示すように、フレネルレンズ４Ａ，４Ｂやテープ６Ａ，６Ｂなどの光学的調整手段による透過率の分布を目標分布から画面端に０．５画素程度ずらした分布となっているので、各画像７Ａ，７Ｂにつき０．５画素ずつずれるため本来１６画素の重畳部分が１７画素になり、スクリーン５に投影される重複部分の画像の明るさの分布は、図６に示すようになる。
【００５６】
そして、光学的調整手段による透過率の分布と目標分布との差異に起因する明るさのずれは平滑装置２による電気的調整で低減され、スクリーン５に投影される画像は均一に近づく。
【００５７】
なお、その他の動作については実施の形態１によるものと同様であるので、その説明を省略する。
【００５８】
以上のように、この実施の形態２によれば、テープ６Ａ，６Ｂなどの光学的調整手段における透過率の所定の滑らかな分布を、目標分布を所定の距離だけ画面端にずらした分布としたので、重畳部分の明るさの分布を平滑しつつ、平滑装置２での電気的な微調整による重畳部分の明るさの分布の調整が容易になり、光学的調整手段の誤差の余裕度が高くなるという効果が得られる。
【００５９】
また、この実施の形態２によれば、画像端の方向に目標分布をずらせば上記効果が得られるが、特に０．５画素分だけ画像端の方向ずらすことにより効果が顕著になる。さらに、１〜２画素のずれであれば、上記効果が十分得られるとともに、重畳部分の明るさの分布が十分に平滑される。
【００６０】
実施の形態３．
図７はこの発明の実施の形態３によるディスプレイ装置の構成を示すブロック図である。図において、２１はスクリーン５に投影された画像を撮影し、その画像の明るさを測定するカメラ（測定手段）であり、２２はカメラ２１により測定された重畳部分の明るさに基づいて、スクリーン５に投影された大画像の各部の明るさが均一になるように平滑装置２における電気的補正特性を制御する制御手段である。なお、図７におけるその他の構成要素については実施の形態１によるものと同様であるので、その説明を省略する。
【００６１】
次に動作について説明する。
この実施の形態３によるディスプレイ装置では、カメラ２１がスクリーン５に投影された大画像８を撮影して重畳部分の明るさを測定し、制御手段２２に通知する。制御手段２２はその重畳部分の明るさに基づいて、平滑装置２において各画像７Ａ，７Ｂの重畳部分に対する電気的補正特性を制御して、スクリーン５に投影された大画像の各部の明るさが均一になるようにする。
【００６２】
なお、その他の動作については実施の形態１によるものと同様であるので、その説明を省略する。また、実施の形態２によるディスプレイ装置に、カメラ２１および制御手段２２を追加するようにしてもよい。
【００６３】
以上のように、この実施の形態３によれば、スクリーンに投影された画像の明るさを測定し、測定した重畳部分の明るさに基づいて、スクリーンに投影された大画像の各部の明るさが均一になるように平滑装置２を制御するようにしたので、自動的に重畳部分の明るさを調整することができ、平滑装置２の電気的補正特性を調整する手間を省くことができるという効果が得られる。
【００６４】
なお、上記実施の形態では、大画像を構成する画像の数が２であるが、３以上でも勿論よい。その場合、画像の数と同数の投影器などを設ける。
【００６５】
【発明の効果】
以上のように、この発明によれば、隣接する画像との重畳部分の明るさを所定の滑らかな分布で光学的に減衰させて重畳部分の明るさを平滑するとともに、各画像に対応する各画像信号のうちの、隣接する画像との重畳部分の明るさを電気的に微調整するようにしたので、重畳部分の明るさの分布を正確に目標分布に合わせることができるという効果がある。
【００６７】
この発明によれば、光学的調整手段として、所定の滑らかな分布の透過率を有するテープを使用したので、配置を簡単に調整することができるとともに、スクリーンのサイズや位置などの変更に応じて透過率の分布を変更したい場合にテープを交換すればよく、簡単に装置の設定変更を実行することができるという効果がある。また、同一のテープを複数作成して裏返して隣接する画像に使用するテープのいずれかとして使用することで、透過率分布が互いに反転した関係にあるテープを精度良く簡単に作成することができるとともに、量産にも向くという効果がある。
【００６８】
この発明によれば、光学的調整手段として、所定の滑らかな分布の透過率で染料を表面に印刷した、または内部に分散したレンズを使用したので、従来の製造技術に基づいて簡単かつ安価で所望の透過率分布の光学的調整手段を実現することができるという効果がある。
【００６９】
この発明によれば、光学的調整手段としてのテープが、透過率の分布の異なる複数の部分を有するので、透明な部分を設ければ個々の画像の明るさの調整を簡単に実行することができ、異なる滑らかな分布の部分を設ければ、スクリーンのサイズや位置などの変更に応じて透過率の分布を簡単に変更することができるという効果がある。
【００７０】
この発明によれば、光学的調整手段を光路上において可動としたので、透過率分布と重畳部分との位置関係を簡単に調整することができるという効果がある。
【図面の簡単な説明】
【図１】 この発明の実施の形態１によるディスプレイ装置の構成を示すブロック図である。
【図２】 図１におけるテープの詳細な構成を示す斜視図である。
【図３】 実施の形態１によるディスプレイ装置での、重畳部分における２つの画像および大画像の明るさの分布の一例を示す図である。
【図４】 図３に示す重畳部分における大画像の明るさの分布の１次微分値（１／１０画素間隔の１次差分値）および２次微分値（１／１０画素間隔の２次差分値）の分布を示す図である。
【図５】 画素の出力分布、平滑装置による電気的調整分布、光学系調整手段による光学的調整分布および目標分布の関係を示す図である。
【図６】 実施の形態２によるディスプレイ装置での、重畳部分における２つの画像および大画像の明るさの分布の一例を示す図である。
【図７】 この発明の実施の形態３によるディスプレイ装置の構成を示すブロック図である。
【図８】 従来のディスプレイ装置を示すブロック図である。
【図９】 重畳部分の明るさの目標分布と平滑装置による電気的補正分布との関係を示す図である。
【図１０】 隣接する２つの画像が１画素ずれて重畳した場合の大画像の明るさの分布を示す図である。
【図１１】 隣接する２つの画像が０．５画素ずれて重畳した場合の大画像の明るさの分布を示す図である。
【図１２】 他の従来のディスプレイ装置を示す図である。
【図１３】 隣接する２つの画像が１画素ずれて重畳した場合の大画像の明るさの分布を示す図である。
【符号の説明】
２ 平滑装置（電気的調整手段）、３Ａ，３Ｂ 投影器、４Ａ，４Ｂ フレネルレンズ（光学的調整手段）、５ スクリーン、６Ａ，６Ｂ テープ（光学的調整手段）、７Ａ，７Ｂ 画像、８ 大画像、１２ リール、２１ カメラ（測定手段）、２２ 制御手段。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device and an image projection method for displaying a single large image by superimposing a part of a plurality of images on a screen.
[0002]
[Prior art]
FIG. 8 is a block diagram showing a conventional display device described in, for example, JP-A-5-300452. In the figure, reference numerals 101A, 101B, and 101C denote a plurality of image signal generators that generate signals of a plurality of images constituting a large image, and reference numeral 102 denotes an adjacent image among the image signals corresponding to each image. It is a smoothing device that electrically adjusts the brightness of the superimposed portion to smooth the brightness of the superimposed portion. 103A, 103B, and 103C superimpose parts of a plurality of images corresponding to a plurality of image signals on each other. Are a plurality of projectors that project the plurality of images onto the screen 104 as one large image.
[0003]
Next, the operation will be described.
FIG. 9 is a diagram showing the relationship between the target distribution of brightness of the superimposed portion and the electrical correction distribution by the smoothing device 102, and FIG. 10 shows the brightness of a large image when two adjacent images are superimposed with a shift of one pixel. FIG. 11 is a diagram illustrating the brightness distribution of a large image when two adjacent images are superimposed with a shift of 0.5 pixels.
[0004]
Images projected from the projectors 103A, 103B, and 103C are partially superimposed and superimposed on the screen 104 as one large image.
[0005]
Therefore, in order to remove the bright band or seam that occurs in the overlapping portion of the two images, the brightness of the overlapping portion in each image is attenuated by the smoothing device 102, and the brightness becomes closer to the image edge of each image. Adjusted to lower. As the smoothing device 102, for example, a special effect generator for image editing that gives a special effect to an image is used.
[0006]
When processing by multiple special effect generators with uniform characteristics is applied to the overlapping part of multiple images, the brightness of the overlapping part approaches the brightness of the non-overlapping part of each image. It is possible to make the brightness of the superimposed portion the same as the brightness of the non-superimposed portion of each image.
[0007]
However, when each image signal processed by the smoothing device 102 is projected by the projectors 103A, 103B, and 103C, the brightness of each pixel width (pixel opening) of the projectors 103A, 103B, and 103C is projected as shown in FIG. Therefore, the brightness distribution of the overlapped portion is actually a stepped distribution as compared with the target distribution.
[0008]
As described above, since the brightness distribution of the superimposed portion of each image is a stepwise distribution, if the number of pixels of the superimposed portion (16 in FIG. 9) is small, the brightness of the superimposed portion in the large image (that is, the adjacent image). The distribution of the sum of the brightness is conspicuous in a staircase pattern. Further, in this case, for example, as shown in FIG. 11, when a shift of 0.5 pixels occurs in the overlapped portion, the brightness of the overlapped portion in the large image becomes conspicuous and becomes conspicuous.
[0009]
Similar conventional display devices are described in Japanese Patent Laid-Open Nos. 62-195984, 3-85879, 4-269793, and the like.
[0010]
Next, FIG. 12 is a diagram showing another conventional display device described in, for example, Japanese Patent Laid-Open No. 5-103286. In the figure, 201A and 201B are a plurality of projectors that superimpose a part of a plurality of images corresponding to a plurality of image signals and project the plurality of images as one large image on the screen 202, and 203 It is a light shielding plate that is provided between the projectors 201A and 201B and the screen 202 and reduces the amount of light at the overlapping portion.
[0011]
Next, the operation will be described.
FIG. 13 is a diagram illustrating the brightness distribution of a large image when two adjacent images are superimposed with a shift of one pixel.
[0012]
A part of the light beams 215A and 215B projected from the projectors 201A and 201B are blocked by the light shielding plate 203, and the amount of light falls in the portion corresponding to the shadows 216A and 216B of the light shielding plate 203, so that two adjacent images are superimposed. The light amount of each of the large images decreases, and the light amount distribution of the large image becomes closer to uniform.
[0013]
However, when the light amount of the overlapping portion is adjusted using the light shielding plate 203 in this way, it is difficult to set the distribution of the light amount of the overlapping portion in the large image to a desired distribution. For example, as shown in FIG. When two images are overlapped with a shift of one pixel (when the overlapped portion of 16 pixels is originally 17 pixels), a light intensity peak occurs at the end of the overlapped portion.
[0014]
[Problems to be solved by the invention]
Since the conventional display device is configured as described above, when the brightness distribution of the superimposed portion is brought close to the target distribution by electrical correction on the image signal, the brightness of the superimposed portion is reduced if the number of pixels in the superimposed portion is small. There is a problem that the distribution of height becomes a stepped distribution and the overlapped portion is easily noticeable.
[0015]
Further, when the brightness distribution of the overlapped portion is made close to the target distribution with the light shielding plate, it is difficult to obtain a distribution with good accuracy with respect to the target distribution, and there is a problem that the overlapped portion is easily noticeable.
[0016]
The present invention has been made to solve the above-described problems. The brightness of the overlapping portion with the adjacent image is optically attenuated with a predetermined smooth distribution to smooth the brightness of the overlapping portion. The brightness distribution of the superimposed portion of each image signal corresponding to each image is finely adjusted electrically so as to accurately match the brightness distribution of the superimposed portion with the target distribution. It is an object to obtain a display device and an image projection method that can be used.
[0017]
[Means for Solving the Problems]
The display device according to the present invention electrically adjusts the brightness of the overlapping portion of each image signal corresponding to each image with an adjacent image, and finely adjusts the electrical adjustment means. A plurality of projectors for projecting images corresponding to the plurality of image signals, and between the projector and the screen, the brightness of the overlapping portion with the adjacent image is optically distributed with a predetermined smooth distribution And an optical adjustment unit that attenuates and smoothes the brightness of the superimposed portion.
[0021]
The display device according to the present invention uses a tape having a predetermined smooth distribution of transmittance as the optical adjustment means.
[0022]
The display device according to the present invention uses, as an optical adjusting means, a lens on which a dye is printed on the surface with a predetermined smooth distribution of transmittance or dispersed inside.
[0023]
The display device according to the present invention uses, as an optical adjustment means, a lens having a dye printed on the surface with a first distribution of transmittance or dispersed therein, and a tape having a second distribution of transmittance. Thus, the transmittance distribution in the optical adjustment means is set to a predetermined smooth distribution based on the first distribution and the second distribution.
[0024]
In the display device according to the present invention, the tape as the optical adjusting means has a plurality of portions having different transmittance distributions.
[0025]
A display device according to the present invention includes a reel capable of winding a tape as an optical adjusting means and capable of arranging any one of a plurality of portions having different transmittance distributions on the optical path. It is.
[0026]
The display device according to the present invention is such that a tape as an optical adjusting means is attached to the surface of another optical element on the optical path.
[0027]
In the display device according to the present invention, the optical adjustment means is movable on the optical path.
[0028]
According to the display device of the present invention, the predetermined smooth distribution in the optical adjustment means is obtained by setting the target distribution for each image for making the brightness of each part of the large image projected on the screen uniform by a predetermined distance. The distribution is shifted in the direction of the edges.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of a display device according to Embodiment 1 of the present invention. In the figure, reference numerals 1A and 1B denote a plurality of image signal generators for generating signals of a plurality of images constituting a large image, and reference numeral 2 denotes a superimposition portion of each image signal corresponding to each image with an adjacent image. 3A and 3B are a plurality of projectors for projecting images corresponding to a plurality of image signals finely adjusted by the smoothing device 2. .
[0033]
4A and 4B are provided between the projectors 3A and 3B and the screen 5, make the light beam of the image from the projectors 3A and 3B close to parallel light, and on the surface (at least one surface on the incident side and the emission side). A Fresnel lens (optical adjustment means) that prints the dye and optically attenuates the brightness of the overlapping portion with the adjacent image by a predetermined first distribution to smooth the brightness of the overlapping portion. One or apparently one screen, and 6A and 6B are provided between the projectors 3A and 3B and the screen 5, and the brightness of the overlapping portion with the adjacent image is optically determined with a predetermined second distribution. It is a tape (optical adjustment means) that attenuates the noise and smoothes the brightness of the overlapping portion. Instead of printing the dye on the surface of the Fresnel lenses 4A and 4B, the dye or the like may be dispersed inside the Fresnel lenses 4A and 4B.
[0034]
Note that the brightness of the overlapping portion of the images 7A and 7B is optically attenuated with a predetermined smooth distribution as the target distribution by the Fresnel lens 4A and the tape 6A, and the Fresnel lens 4B and the tape 6B. That is, the product of the first distribution and the second distribution becomes the target distribution. Therefore, the first distribution and the second distribution can be arbitrarily selected so that the product of both becomes the target distribution. Alternatively, the transmittance distribution of the tapes 6A and 6B may be set as the target distribution without printing the dye on the Fresnel lenses 4A and 4B. Alternatively, the dye may be printed on the Fresnel lenses 4A and 4B with a target distribution, and the tapes 6A and 6B may not be provided.
[0035]
FIG. 2 is a perspective view showing a detailed configuration of the tape 6A in FIG.
Reference numerals 11A and 11B denote a plurality of portions with different transmittance distributions constituting the tape 6A, and reference numeral 12 denotes a tape 6A that can be wound, and any of the plurality of portions with different transmittance distributions on the tape 6A. It is a reel that can be placed on the optical path. The portion 11A has a predetermined second distribution of transmittance, and the portion 11B has a predetermined transparent and constant transmittance. Note that this portion may be 3 or more, and a transmittance distribution of 3 or more may be settable.
[0036]
The tape 6B is configured in the same manner as the tape 6A, but the transmittance distribution of the tape 6B is an inversion of the transmittance distribution of the tape 6A.
[0037]
Further, the tapes 6A and 6B may be fixed using a support member such as a reel 12 as shown in FIG. 2, or on the surface of another optical element on the optical path such as the Fresnel lenses 4A and 4B. You may make it stick. Furthermore, the thinner the tapes 6A and 6B, the smaller the variation in the optical path.
[0038]
Next, the operation will be described.
FIG. 3 is a diagram showing an example of the brightness distribution of the two images 7A and 7B and the large image 8 in the superimposed portion in the display device according to the first embodiment, and FIG. 4 is a diagram showing the large distribution in the superimposed portion shown in FIG. It is a figure which shows distribution of the primary differential value (primary difference value of 1/10 pixel interval) and secondary differential value (secondary difference value of 1/10 pixel interval) of the brightness distribution of the image 8. FIG.
[0039]
The image signal generators 1 </ b> A and 1 </ b> B generate a plurality of image signals constituting a large image from image data and the like and supply the signals to the smoothing device 2. The smoothing device 2 electrically finely adjusts the brightness of the overlapping portion of the image signals corresponding to each image with the adjacent image, and supplies the adjusted image signal to the projectors 3A and 3B. At this time, in the smoothing device 2, the adjustment of the brightness distribution of the superimposed portion by the optical adjusting means such as the Fresnel lenses 4A and 4B and the tapes 6A and 6B is complemented, and the brightness distribution of the superimposed portion in the large image 8 is more enhanced. Fine-tuned to be uniform and smooth.
[0040]
The projectors 3 </ b> A and 3 </ b> B emit an image light beam corresponding to the image signal finely adjusted by the smoothing device 2. The light beam emitted from the projector 3A is made close to parallel light by the Fresnel lens 4A, reaches the screen 5 through the tape 6A, and becomes an image 7A. Similarly, the light beam emitted from the projector 3B is brought close to parallel light by the Fresnel lens 4B, reaches the screen 5 via the tape 6B, and becomes an image 7B.
[0041]
At this time, the light amount of the overlapping portion of the luminous flux emitted from the projector 3A is first optically attenuated with the first distribution by the dye printed with the predetermined first distribution on the Fresnel lens 4A, Further, the tape 6A is optically attenuated with a predetermined second distribution, and as a whole, optically attenuated with a predetermined smooth distribution. The predetermined smooth distribution at this time is a distribution in which the differential values up to a predetermined order are within a predetermined range in the overlapped portion. In this case, the predetermined smooth distribution is expressed by the following equation when the transmittance at the distance x from the screen edge when the width of one pixel is 1 is y and the number of pixels in the overlapped portion is n. Let the distribution be represented. The same applies to the light beam emitted from the projector 3B. However, the predetermined smooth distribution is inverted.

[0042]
When n = 16, the brightness of the images 7A and 7B and the brightness of the large image 8 in the overlapped portion attenuated by the distribution based on this equation are as shown in FIG. Further, the primary differential value and the secondary differential value of the brightness of the superimposed portion in the large image 8 are as shown in FIG. 4, and the absolute value of the primary differential value becomes 0.5 or less, and the secondary differential value. The absolute value of is about 0.35 or less.
[0043]
Next, the arrangement of the tapes 6A and 6B will be described.
The tapes 6 </ b> A and 6 </ b> B are arranged in a state where the light and dark directions are aligned with the arrangement direction of the images 7 </ b> A and 7 </ b> B and are stretched by the reel 12. Further, when the large image 8 is displayed, a portion 11A having a predetermined second distribution of transmittance is arranged on the optical path, and when adjusting the brightness of each image, the transparent portion 11B is used. Is arranged on the optical path.
[0044]
The position adjustment of the tapes 6A and 6B in the arrangement direction of the images 7A and 7B is performed by moving the reel 12 and the entire tapes 6A and 6B by a mechanism (not shown), and the tapes 6A and 6B in the direction perpendicular to the reels 12 and 6B are moved. The position adjustment of 6B is executed based on the degree of winding of the reel 12. Further, the axis of the reel 12 to which the tapes 6A and 6B are fixed may be movable, and the tapes 6A and 6B may be moved in the arrangement direction of the images 7A and 7B.
[0045]
The second distribution of the transmittance of the tapes 6A and 6B may be formed in the longitudinal direction of the tapes 6A and 6B. In this case, the positions of the tapes 6A and 6B in the arrangement direction of the images 7A and 7B. The adjustment is executed by the degree of winding of the reel 12, and the position adjustment of the tapes 6A and 6B in the direction perpendicular to the reel 12 is executed by moving the reel 12 and the entire tapes 6A and 6B by a mechanism (not shown). .
[0046]
As described above, according to the first embodiment, among the image signals corresponding to each image, the brightness of the overlapping portion with the adjacent image is electrically finely adjusted, and a plurality of finely adjusted images are obtained. Since the image corresponding to the signal is projected and the brightness of the superimposed portion with the adjacent image is optically attenuated with a predetermined smooth distribution to smooth the brightness of the superimposed portion, the brightness of the superimposed portion It is possible to obtain the effect of accurately matching the distribution of the target distribution with the target distribution.
[0047]
Further, according to the first embodiment, for example, based on the formula (1), the differential value of the predetermined smooth distribution up to the predetermined order (in this case, up to the second order) in the overlapping portion is in the predetermined range. Therefore, the brightness distribution in the overlapping portion can be surely smoothed. In particular, the secondary differential value can be lowered by selecting the distribution based on the power of the square root of 2 as shown in Equation (1). That is, when the absolute value of each differential value becomes small, the continuity becomes high and the luminance changes smoothly, so that the luminance step is hardly recognized.
[0048]
Furthermore, according to the first embodiment, since the tapes 6A and 6B having a predetermined smooth distribution of transmittance are used as the optical adjusting means, the arrangement can be easily adjusted and the size of the screen 5 can be adjusted. When it is desired to change the transmittance distribution according to the change of the position or the like, the tapes 6A and 6B may be exchanged, and the effect that the setting change of the apparatus can be easily performed is obtained. Further, by creating a plurality of the same tapes and turning them over and using them as either the tape 6A or the tape 6B, it is possible to easily and accurately produce the tapes 6A and 6B in which the transmittance distributions are reversed with respect to each other. As well as being able to achieve mass production effects.
[0049]
Further, according to the first embodiment, since the Fresnel lenses 4A and 4B having the dye printed on the surface or dispersed therein are used as the optical adjusting means with the transmittance of the predetermined smooth distribution, Based on the technology, it is possible to obtain an effect that it is possible to realize an optical adjustment means having a desired transmittance distribution that is simple and inexpensive.
[0050]
Further, according to the first embodiment, since the plurality of portions having different transmittance distributions are provided on the tapes 6A and 6B, the brightness of each image can be easily adjusted if a transparent portion is provided. If different smooth distribution portions are provided, the transmittance distribution can be easily changed according to changes in the size, position, etc. of the screen 5.
[0051]
Further, according to the first embodiment, since the tapes 6A and 6B are arranged in a movable state on the optical path, the positional relationship between the transmittance distribution and the overlapping portion can be easily adjusted. can get.
[0052]
As optical adjustment means, dimming means such as Fresnel lenses 4A and 4B and tapes 6A and 6B printed with dyes are used. However, a brightening means such as an optical intensifier may be used. Instead of the bulb, the light may be reduced by printing on a transparent substrate or by dispersing the dye, and the same effect can be obtained. Furthermore, the processing in the smoothing device 2 may be realized as hardware processing or may be realized as software processing.
[0053]
Embodiment 2. FIG.
In the display device according to the second embodiment of the present invention, the transmittance distribution in the optical adjusting means such as the tapes 6A and 6B is set at the edge of the image by a predetermined distance (about 0.5 pixels in the second embodiment) from the target distribution. The distribution is shifted in the direction. In order to do this, for example, the tapes 6A and 6B in the first embodiment may be moved by the predetermined distance. The other components are the same as those according to the first embodiment, and a description thereof will be omitted.
[0054]
Next, the operation will be described.
FIG. 5 is a diagram showing the relationship among the pixel output distribution, the electrical adjustment distribution by the smoothing device 2, the optical adjustment distribution by the optical system adjustment means, and the target distribution. FIG. 6 is a diagram illustrating an example of the brightness distribution of two images and a large image in a superimposed portion in the display device according to the second embodiment.
[0055]
In the second embodiment, for example, as shown in FIG. 5, the transmittance distribution by optical adjusting means such as Fresnel lenses 4A and 4B and tapes 6A and 6B is shifted from the target distribution by about 0.5 pixels to the screen edge. Therefore, since each of the images 7A and 7B is shifted by 0.5 pixels, the overlapping portion of 16 pixels originally becomes 17 pixels, and the brightness distribution of the overlapping portion projected on the screen 5 is as follows: As shown in FIG.
[0056]
And the brightness | luminance shift resulting from the difference of the transmittance | permeability distribution by an optical adjustment means and target distribution is reduced by the electrical adjustment by the smoothing apparatus 2, and the image projected on the screen 5 approaches uniformly.
[0057]
Since other operations are the same as those according to the first embodiment, description thereof is omitted.
[0058]
As described above, according to the second embodiment, the predetermined smooth distribution of transmittance in the optical adjusting means such as the tapes 6A and 6B is a distribution in which the target distribution is shifted to the screen edge by a predetermined distance. Therefore, it is easy to adjust the brightness distribution of the superimposed portion by electrical fine adjustment in the smoothing device 2 while smoothing the brightness distribution of the superimposed portion, and the margin of error of the optical adjustment means is high. The effect of becoming is obtained.
[0059]
Further, according to the second embodiment, the above-described effect can be obtained by shifting the target distribution in the direction of the image edge, but the effect becomes particularly remarkable by shifting the direction of the image edge by 0.5 pixels. Furthermore, if the shift is 1 to 2 pixels, the above effect is sufficiently obtained, and the brightness distribution of the overlapped portion is sufficiently smoothed.
[0060]
Embodiment 3 FIG.
FIG. 7 is a block diagram showing a configuration of a display device according to Embodiment 3 of the present invention. In the figure, 21 is a camera (measuring means) for taking an image projected on the screen 5 and measuring the brightness of the image, and 22 is a screen based on the brightness of the superimposed portion measured by the camera 21. 5 is a control means for controlling the electrical correction characteristics in the smoothing device 2 so that the brightness of each part of the large image projected onto the screen 5 is uniform. Since the other components in FIG. 7 are the same as those according to the first embodiment, description thereof is omitted.
[0061]
Next, the operation will be described.
In the display device according to the third embodiment, the camera 21 captures the large image 8 projected on the screen 5, measures the brightness of the superimposed portion, and notifies the control means 22. Based on the brightness of the superimposed portion, the control means 22 controls the electrical correction characteristics for the superimposed portions of the images 7A and 7B in the smoothing device 2, and the brightness of each portion of the large image projected on the screen 5 is controlled. Make it uniform.
[0062]
Since other operations are the same as those according to the first embodiment, description thereof is omitted. Further, the camera 21 and the control means 22 may be added to the display device according to the second embodiment.
[0063]
As described above, according to the third embodiment, the brightness of the image projected on the screen is measured, and the brightness of each part of the large image projected on the screen is measured based on the measured brightness of the superimposed portion. Since the smoothing device 2 is controlled so as to be uniform, it is possible to automatically adjust the brightness of the overlapped portion and to save the trouble of adjusting the electrical correction characteristics of the smoothing device 2. An effect is obtained.
[0064]
In the above embodiment, the number of images constituting a large image is two, but may be three or more. In that case, as many projectors as the number of images are provided.
[0065]
【The invention's effect】
As described above, according to the present invention, the brightness of the superimposed portion with the adjacent image is optically attenuated with a predetermined smooth distribution to smooth the brightness of the superimposed portion, and each image corresponding to each image Since the brightness of the overlapping portion of the image signal with the adjacent image is electrically finely adjusted, the brightness distribution of the overlapping portion can be accurately adjusted to the target distribution.
[0067]
According to the present invention, since the tape having the transmittance of the predetermined smooth distribution is used as the optical adjustment means, the arrangement can be easily adjusted and the screen size and position can be changed according to the change. It is only necessary to replace the tape when it is desired to change the transmittance distribution, and the apparatus setting can be easily changed. In addition, by creating a plurality of identical tapes and turning them over and using them as one of the tapes used for adjacent images, it is possible to easily and accurately create tapes whose transmittance distributions are reversed with respect to each other. This is effective for mass production.
[0068]
According to the present invention, as the optical adjustment means, a lens on which the dye is printed on the surface with a predetermined smooth distribution of transmittance or dispersed therein is used, so that it is simple and inexpensive based on the conventional manufacturing technology. There is an effect that an optical adjustment means of a desired transmittance distribution can be realized.
[0069]
According to the present invention, the tape as the optical adjustment means has a plurality of portions having different transmittance distributions. Therefore, if a transparent portion is provided, the brightness of each image can be easily adjusted. If different smooth distribution portions are provided, there is an effect that the transmittance distribution can be easily changed in accordance with changes in the size and position of the screen.
[0070]
According to the present invention, since the optical adjustment means is movable on the optical path, there is an effect that the positional relationship between the transmittance distribution and the overlapping portion can be easily adjusted.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a display device according to Embodiment 1 of the present invention.
2 is a perspective view showing a detailed configuration of the tape in FIG. 1. FIG.
FIG. 3 is a diagram illustrating an example of brightness distribution of two images and a large image in a superimposed portion in the display device according to the first embodiment.
4 is a first differential value (primary difference value at 1/10 pixel intervals) and a second differential value (secondary difference at 1/10 pixel intervals) of the brightness distribution of a large image in the overlapping portion shown in FIG. 3; It is a figure which shows distribution of a value.
FIG. 5 is a diagram illustrating a relationship among a pixel output distribution, an electrical adjustment distribution by a smoothing device, an optical adjustment distribution by an optical system adjustment unit, and a target distribution.
6 is a diagram illustrating an example of brightness distribution of two images and a large image in a superimposed portion in the display device according to Embodiment 2. FIG.
FIG. 7 is a block diagram showing a configuration of a display device according to Embodiment 3 of the present invention.
FIG. 8 is a block diagram illustrating a conventional display device.
FIG. 9 is a diagram illustrating a relationship between a target distribution of brightness of an overlapped portion and an electrical correction distribution by a smoothing device.
FIG. 10 is a diagram illustrating a brightness distribution of a large image when two adjacent images are superimposed with a shift of one pixel.
FIG. 11 is a diagram illustrating a brightness distribution of a large image when two adjacent images are superimposed with a shift of 0.5 pixels.
FIG. 12 is a view showing another conventional display device.
FIG. 13 is a diagram illustrating a brightness distribution of a large image when two adjacent images are superimposed with a shift of one pixel.
[Explanation of symbols]
2 Smoothing device (electrical adjustment means), 3A, 3B projector, 4A, 4B Fresnel lens (optical adjustment means), 5 screen, 6A, 6B tape (optical adjustment means), 7A, 7B images, 8 large images , 12 reels, 21 cameras (measuring means), 22 control means.

Claims (7)

In a display device that displays a single large image by superimposing a part of a plurality of images on a screen,
Electrical adjustment means for electrically fine-tuning the brightness of the overlapping portion with the adjacent image of each image signal corresponding to each image;
A plurality of projectors for projecting images corresponding to a plurality of image signals finely adjusted by the electrical adjustment means;
Optical adjustment means provided between the projector and the screen and optically attenuating the brightness of the superimposed portion with an adjacent image with a predetermined smooth distribution to smooth the brightness of the superimposed portion. And
The optical adjustment means is a lens in which a dye is printed on the surface with a predetermined smooth distribution of transmittance or dispersed inside.
A display device. In a display device that displays a single large image by superimposing a part of a plurality of images on a screen,
Electrical adjustment means for electrically fine-tuning the brightness of the overlapping portion with the adjacent image of each image signal corresponding to each image;
A plurality of projectors for projecting images corresponding to a plurality of image signals finely adjusted by the electrical adjustment means;
Optical adjustment means provided between the projector and the screen and optically attenuating the brightness of the superimposed portion with an adjacent image with a predetermined smooth distribution to smooth the brightness of the superimposed portion. And
The optical adjustment means includes a lens having a dye printed on its surface with a transmittance of a first distribution or dispersed therein, and a tape having a transmittance of a second distribution, and the first distribution. and a display device you characterized by having a transmissivity of a predetermined smooth distribution based on the second distribution. Tapes as an optical adjusting means, a display device according to claim 1, wherein a plurality of different parts of the distribution of transmittance. A possible tape winding as optical adjustment means, according to claim 3, characterized in that it comprises a reel that can be located in the optical path to any of the different parts of the distribution of transmittance in the tape The display device described. In a display device that displays a single large image by superimposing a part of a plurality of images on a screen,
Electrical adjustment means for electrically fine-tuning the brightness of the overlapping portion with the adjacent image of each image signal corresponding to each image;
A plurality of projectors for projecting images corresponding to a plurality of image signals finely adjusted by the electrical adjustment means;
Optical adjustment means provided between the projector and the screen and optically attenuating the brightness of the superimposed portion with an adjacent image with a predetermined smooth distribution to smooth the brightness of the superimposed portion. When,
The optical adjusting means is a tape having a predetermined smooth distribution of transmittance, has a plurality of portions having different transmittance distributions, can be wound around the tape, and the transmittance distribution in the tape A reel capable of arranging any of a plurality of different parts on the optical path
A display device. Tapes as an optical adjusting means, a display device according to claim 1, characterized in that it is attached to the surface of the other optical elements of the optical path. Optical adjusting means, a display device according to any one of claims 1 to 6, characterized in that the optical path is movable.

Images