JPH05122712A - Projection type television receiver - Google Patents
Projection type television receiverInfo
- Publication number
- JPH05122712A JPH05122712A JP3283418A JP28341891A JPH05122712A JP H05122712 A JPH05122712 A JP H05122712A JP 3283418 A JP3283418 A JP 3283418A JP 28341891 A JP28341891 A JP 28341891A JP H05122712 A JPH05122712 A JP H05122712A
- Authority
- JP
- Japan
- Prior art keywords
- screen
- projection
- optical axis
- projection lens
- red
- 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
Landscapes
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、複数の表示素子の画像
を拡大投影し、容易にフルカラ−の大画面映像を得る投
写型テレビに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type television which enlarges and projects images of a plurality of display elements to easily obtain a full-color large screen image.
【0002】[0002]
【従来の技術】小形CRT等の映像源を光学的に拡大投
影し、大画面を実現する投写型テレビは近年家庭用、業
務用に普及が進んでいる。図9は従来の3管式プロジェ
クションテレビの構成図である。図において、1は映像
源であるCRT、2は各CRTを投写する投写レンズ、
3はスクリ−ンである。2. Description of the Related Art In recent years, projection type televisions for optically enlarging and projecting an image source such as a small CRT to realize a large screen have become popular for home and business use. FIG. 9 is a block diagram of a conventional three-tube projection television. In the figure, 1 is a CRT which is an image source, 2 is a projection lens which projects each CRT,
3 is a screen.
【0003】CRT1は赤、青、緑のモノクロ管1R、
1B、1Gの3本からなり、スクリ−ン水平方向に配さ
れている。各CRT1はそれぞれ投写レンズ2R,2
B,2Gにより拡大されスクリ−ン3上で合成され、フ
ルカラ−の大画面映像を得る。このとき各投写レンズ2
の光軸4は4Gを基準として4R,4Bは集中角5をな
してスクリ−ン中央6で交差する。The CRT 1 is a red, blue, green monochrome tube 1R,
It consists of 1B and 1G, and is arranged in the horizontal direction of the screen. Each CRT 1 has a projection lens 2R, 2
It is enlarged by B and 2G and synthesized on the screen 3 to obtain a full-color large screen image. At this time, each projection lens 2
With respect to the optical axis 4 of 4G, 4R and 4B form a converging angle 5 and intersect at the screen center 6.
【0004】[0004]
【発明が解決しようとする課題】従来の投写型テレビは
図10に示すように基準となる投写レンズの光軸4Gに
対し、4R,4Bは集中角5を有し、かつスクリ−ン中
央位置6に入射するので、投写レンズの画角が最大とな
るスクリーン4隅において、赤色画面・青色画面の照度
分布が非対称となり、この結果スクリーン上での緑、
赤、青の合成映像に部分的に赤あるいは青味を帯びた色
ムラを生じる。In the conventional projection television, as shown in FIG. 10, 4R and 4B have a converging angle 5 with respect to the optical axis 4G of the reference projection lens, and the central position of the screen. Since it is incident on 6, the illuminance distributions of the red screen and the blue screen are asymmetrical at the four corners of the screen where the angle of view of the projection lens is maximum, and as a result, the green on the screen is
Partial reddish or bluish color unevenness occurs in the red and blue composite image.
【0005】以下、この問題点を図11を用いて詳細に
述べる。図11は図10の投写光学系の内、緑、赤色光
学系だけに注目し、上面より見た光路図であり、図にお
いて、8は投写レンズの瞳、9はCRT1に描かれた映
像面である。また、7a をスクリ−ン右上隅、7bを左
上隅とする。L1は映像面9から瞳8までの距離、L2
は瞳8からスクリ−ン3までの距離、hはスクリ−ン中
央から各左右対角隅までの距離である。Hereinafter, this problem will be described in detail with reference to FIG. FIG. 11 is an optical path diagram as seen from the top, focusing on only the green and red optical systems of the projection optical system of FIG. 10, where 8 is the pupil of the projection lens and 9 is the image plane drawn on the CRT 1. Is. Further, 7a is the upper right corner of the screen and 7b is the upper left corner. L1 is the distance from the image plane 9 to the pupil 8, L2
Is the distance from the pupil 8 to the screen 3, and h is the distance from the center of the screen to the left and right diagonal corners.
【0006】いま、緑色の光軸4Gとスクリーン対角隅
7へ向かう光線の成す画角をW0とした時、7a、7b
へ向かう光線の画角は等しくW0である。一方、赤色光
学系において、光軸を基準に7a、7bへ向かう光線の
成す画角をそれぞれW1、W2とする。7a、7bから
光軸4Rにおろした垂線の足10a、10bから赤色投
写レンズの瞳8Rまでの距離は各々異なり、垂線の長さ
Sが等しいことから、明らかに画角W1、W2は異な
り、W1はW2よりも大きい。Now, assuming that the angle of view formed by the light beam traveling toward the green optical axis 4G and the diagonal corner 7 of the screen is W0, 7a, 7b
The angles of view of the rays going toward are equal to W0. On the other hand, in the red optical system, the angles of view formed by the light rays traveling toward the optical axes 7a and 7b are W1 and W2, respectively. The distances from the feet 10a and 10b of the perpendiculars drawn from the optical axes 4R to the pupils 8R of the red projection lens are different from each other, and the lengths S of the perpendiculars are equal. Therefore, the angles of view W1 and W2 are obviously different, W1 is greater than W2.
【0007】ところが、投写レンズは画角により出射光
の光量が異なり、一般に画角が大きくなるにつれ光量は
減少する。画角0度の光量と比較した光量比は図14の
ような特性を有する。画角W1はW2より大きいことか
ら赤色投写映像はスクリ−ン右隅7aの方が左隅7bよ
り暗くなる。逆に図示していない青色投写映像は7bの
ほうが暗くなるので、この結果スクリ−ン対角上での照
度分布は図12のようになる。図12はスクリーン中心
から右上隅7aへ向かう対角上において、緑、赤、青の
スクリーン中心における照度を1に規格化したときの照
度比を示す。縦軸が照度比、横軸がスクリーン中心から
対角隅までの距離を示す。However, in the projection lens, the amount of emitted light differs depending on the angle of view, and generally the amount of light decreases as the angle of view increases. The light amount ratio compared with the light amount at the angle of view of 0 degree has the characteristic shown in FIG. Since the angle of view W1 is larger than W2, the red projected image is darker at the screen right corner 7a than at the left corner 7b. On the contrary, the blue projection image (not shown) is darker in 7b, and as a result, the illuminance distribution on the screen diagonal becomes as shown in FIG. FIG. 12 shows the illuminance ratio when the illuminances at the screen centers of green, red, and blue are normalized to 1 on the diagonal from the center of the screen to the upper right corner 7a. The vertical axis represents the illuminance ratio, and the horizontal axis represents the distance from the screen center to the diagonal corner.
【0008】また、緑色投写映像のスクリーン上の照度
は、スクリーン中心を対称点として同心円状に均一に分
布する。従って、緑色の照度を基準として赤、青色照度
の緑に対する相対照度比をとることにより、任意のスク
リーン位置における赤、青色照度の不均一性、つまり色
ムラの程度を知ることが出来る。Further, the illuminance of the green projected image on the screen is uniformly distributed concentrically with the center of the screen as a symmetrical point. Therefore, by taking the relative illuminance ratio of red and blue illuminance to green with respect to the illuminance of green, it is possible to know the nonuniformity of the illuminance of red and blue at any screen position, that is, the degree of color unevenness.
【0009】従来の投写光学系の相対照度比を図13に
示す。縦軸は相対照度比、横軸はスクリーン中心から右
上隅7aへ向かう対角上の距離を表す。従って、従来の
投写光学系では、特にスクリーン隅部に大きな色ムラを
生じることが分かる。FIG. 13 shows the relative illuminance ratio of the conventional projection optical system. The vertical axis represents the relative illuminance ratio, and the horizontal axis represents the diagonal distance from the center of the screen to the upper right corner 7a. Therefore, it can be seen that the conventional projection optical system causes large color unevenness particularly in the corners of the screen.
【0010】また、投写光学系がスクリーン中心を通る
水平軸に対して対称であるとき、スクリーン右下隅、左
下隅でも同様となる。このため、スクリーンの左隅が赤
みがかり、右隅が青みがかるという色ムラが生じる。When the projection optical system is symmetrical with respect to the horizontal axis passing through the center of the screen, the same applies to the lower right corner and the lower left corner of the screen. For this reason, color unevenness occurs in which the left corner of the screen is reddish and the right corner is bluish.
【0011】この左右対角隅の照度の違いにもとづく色
ムラは、映像源であるCRTの周辺部の輝度を電気的に
補正することにより軽減することは可能であるが、スク
リーン隅部に生じる大きな色ムラを補正するには多くの
電流を流す必要があり、CRT蛍光面でのビームスポッ
トの拡大、つまり解像度の劣化をまねくことになる。The color unevenness due to the difference in the illuminance at the diagonal corners on the left and right can be reduced by electrically correcting the luminance of the peripheral portion of the CRT which is the image source, but it occurs at the corners of the screen. A large amount of current needs to be supplied to correct large color unevenness, which leads to expansion of the beam spot on the CRT phosphor screen, that is, deterioration of resolution.
【0012】近年、投写型テレビのセットのコンパクト
化の要望が強く、短投写距離の投写レンズが必要となっ
てきた。しかし、短投写距離の投写レンズを用いると、
CRT1の配置余裕を確保するために集中角5を大きく
しなければならない。このため画角W1、W2の差から
生じる光量の違いが大きくなる。つまり、この問題点は
投写型テレビの小型化を妨げることにつながる。In recent years, there has been a strong demand for downsizing of a projection television set, and a projection lens having a short projection distance has been required. However, with a short projection distance projection lens,
The concentration angle 5 must be increased in order to secure the arrangement margin of the CRT 1. Therefore, the difference in the amount of light caused by the difference between the view angles W1 and W2 becomes large. That is, this problem hinders the downsizing of the projection television.
【0013】本発明は上記のような問題点を解消するた
めになされたもので、集中角をもってスクリ−ンに斜め
入射する赤、青色映像の光量の非対称性を緩和し、色ム
ラの少ない小形の投写型テレビを得ることを目的とす
る。The present invention has been made in order to solve the above-mentioned problems, and alleviates the asymmetry of the light amounts of red and blue images obliquely incident on the screen with a converging angle, and has a small size with less color unevenness. The purpose is to obtain a projection television.
【0014】[0014]
【課題を解決するための手段】本発明に係る投写型テレ
ビは、集中角5を成し、スクリーン中心を通る水平方向
に配される投写光学系において、光軸を基準にスクリー
ン右隅へ向かう光線の成す角をW1、スクリーン左隅へ
向かう光線の成す角をW2としたとき、W1とW2が等
しくなるよう各々の投写レンズの光軸がスクリーンに入
射する位置を基準の緑色投写レンズの光軸と異なる位置
に設けたものである。A projection television according to the present invention is a projection optical system which forms a converging angle 5 and is arranged in the horizontal direction passing through the center of the screen, and is directed to the right corner of the screen with respect to the optical axis. Let W1 be the angle formed by the light rays and W2 be the angle formed by the light rays traveling to the left corner of the screen. The optical axis of the green projection lens is the position where the optical axis of each projection lens is incident on the screen so that W1 and W2 are equal. It is provided at a position different from.
【0015】また、上記光学配置の投写型テレビは赤
色、青色CRTに、残存する色ムラを補正する駆動電流
発生回路を設けた。In the projection type television having the above optical arrangement, the red and blue CRTs are provided with the drive current generating circuit for correcting the remaining color unevenness.
【0016】また、本発明の赤、青色投写レンズの光軸
は、各々緑色投写レンズの光軸とスクリーン上で異なる
位置に入射し、上記スクリーン中心から対角隅までの距
離をS1、スクリーン左右対角隅方向への任意の点xま
での距離をS2、赤、青色投写レンズ各々の右対角上x
a、左対角上xbへ入射する光線の光軸と成す角を各々
W11、W22とした時、W11、W22が少なくとも
下記(1)式の範囲内において等しくなるよう、赤、青
投写レンズの光軸のスクリーン入射位置を決定する。Further, the optical axes of the red and blue projection lenses of the present invention are incident on the screen at different positions from the optical axes of the green projection lens, and the distance from the center of the screen to the diagonal corner is S1, the left and right sides of the screen. The distance to an arbitrary point x in the diagonal direction is S2, and x is on the right diagonal of each of the red and blue projection lenses.
a, where the angles formed with the optical axis of the light beam incident on the left diagonal xb are W11 and W22, respectively, so that W11 and W22 are equal to each other at least within the range of formula (1) below. The screen incident position of the optical axis is determined.
【0017】0.5 < S2/S1 < 0.9 …(1)0.5 <S2 / S1 <0.9 (1)
【0018】また、集中角のみならず仰角も有して配さ
れる投写光学系においては、スクリーン中心を通る水平
軸からはずれた位置に、各々の投写レンズの光軸がスク
リーンに入射するよう配したものである。Further, in a projection optical system which is arranged not only with a converging angle but also with an elevation angle, it is arranged so that the optical axis of each projection lens is incident on the screen at a position deviated from the horizontal axis passing through the center of the screen. It was done.
【0019】[0019]
【作用】本発明における投写型テレビは、集中角を成し
て配される投写光学系のスクリーン左右隅へ向かう光線
の画角W1、W2が等しくなるよう、光軸入射位置を決
めることにより、スクリーン4隅での光量に差が生じず
色ムラを軽減する。In the projection television according to the present invention, the optical axis incident positions are determined so that the angles of view W1 and W2 of the light rays directed to the left and right corners of the screen of the projection optical system arranged at a converging angle are equal. There is no difference in the amount of light at the four corners of the screen, and color unevenness is reduced.
【0020】上記光学系において、スクリーン4隅外に
わずかに残存する照度の不均一性を赤、青CRTに補正
用駆動電流回路を設けることにより、解像度を劣化させ
ることなくスクリーン全般に色ムラの軽減された映像を
得る。In the above-mentioned optical system, the unevenness of the illuminance slightly remaining outside the four corners of the screen is corrected by providing a driving current circuit for correction in the red and blue CRTs. Get reduced footage.
【0021】本発明における投写型テレビは、スクリー
ン中心より左右対角上の(1)式を満たす点における画
角W11、W22が等しいので、光学的配置のみでスク
リーン全般にわたる色ムラを軽減する。In the projection television according to the present invention, the angles of view W11 and W22 at the point satisfying the formula (1) on the diagonal left and right with respect to the center of the screen are equal, and therefore the color unevenness over the entire screen is reduced only by the optical arrangement.
【0022】上記、集中角を有して配される光学系にお
いて、集中角のみならず仰角をも有して配された光学系
に対しては、各投写レンズ光軸のスクリーン入射位置を
スクリーン中心を通る水平軸からはずれた位置に設けた
ことにより、上記と同等の作用を奏し、スクリーン上の
色ムラを軽減する。In the above-mentioned optical system arranged with a converging angle, for the optical system arranged not only with a converging angle but also with an elevation angle, the screen incident position of each projection lens optical axis is set to the screen. By being provided at a position off the horizontal axis passing through the center, the same operation as described above is achieved and color unevenness on the screen is reduced.
【0023】[0023]
【実施例】実施例1.本発明の実施例を図1を用いて説
明する。図1は本発明の赤、緑色投写光学系を取り出
し、上面より見た図である。本投写光学系では、スクリ
ーン中心を通る水平方向に各投写レンズが配されるた
め、水平軸に対して対称な左右対角下隅においても同様
の効果が得られるので、ここでは、スクリーン上側部に
限って説明する。EXAMPLES Example 1. An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a view of the red and green projection optical systems of the present invention taken out and seen from the upper surface. In this projection optical system, since each projection lens is arranged in the horizontal direction that passes through the center of the screen, the same effect can be obtained at the lower left and right diagonal corners that are symmetrical with respect to the horizontal axis. Only explain.
【0024】緑色投写レンズの光軸4Gはスクリーン3
の中心6に入射し、スクリーン右上隅7a、スクリーン
左上隅7bへ入射する光線の成す角は等しくW0とな
る。一方、赤色投写光学系では光軸4Rはスクリーン中
心6と異なる入射位置11に入射する。この時、スクリ
ーン右上隅7aへ向かう光線の成す角W1とスクリーン
左上隅7bへ向かう光線が成す角W2がほぼ等しくなる
よう、入射位置11は決められている。The optical axis 4G of the green projection lens is the screen 3
The angles formed by the rays incident on the center 6 of the screen and entering the screen upper right corner 7a and the screen upper left corner 7b are equal to W0. On the other hand, in the red projection optical system, the optical axis 4R enters the incident position 11 different from the screen center 6. At this time, the incident position 11 is determined so that the angle W1 formed by the light ray traveling toward the upper right corner 7a of the screen and the angle W2 formed by the light ray traveling toward the upper left corner 7b of the screen are substantially equal.
【0025】従って、赤色投写光学系はスクリーン3に
対し集中角5をもって入射するにも関わらず、スクリー
ン左右対角隅へ向かう光線の画角がほぼ等しいので、入
射光量がほぼ等しくなり色ムラが軽減される。Therefore, even though the red projection optical system is incident on the screen 3 at the converging angle 5, the angles of view of the light rays traveling to the diagonal corners of the screen are almost equal, so that the incident light amounts are almost equal and color unevenness occurs. Will be reduced.
【0026】この時のスクリーン対角右上方向の照度分
布を図2に示す。図2の縦軸は緑、赤、青各色のスクリ
ーン中心の照度を1に正規化したときの照度比を示し、
横軸はスクリーン対角距離を表す。また、対角上の緑の
照度を基準に赤、青の相対照度比を縦軸にとった色ムラ
の様子を図4に示す。図4より、スクリーン周辺部の色
ムラが図13に比べ大幅に改善されている。FIG. 2 shows the illuminance distribution in the upper right direction on the diagonal of the screen at this time. The vertical axis of FIG. 2 shows the illuminance ratio when the illuminance at the screen center of each of green, red, and blue is normalized to 1,
The horizontal axis represents the screen diagonal distance. FIG. 4 shows a state of color unevenness in which the vertical illuminance ratio of red and blue is based on the diagonal illuminance of green. From FIG. 4, the color unevenness in the peripheral portion of the screen is significantly improved as compared with FIG.
【0027】実施例2.上記の実施例では、スクリーン
中心、隅部での色ムラが解消されるような光学配置をと
った。しかしながら、図4に示すようにスクリーン他の
部分では色ムラが残存することになる。この問題は、各
表示素子に色ムラを補正するための駆動電流発生回路を
設けることにより解消される。この回路は図6の水平走
査波形の1Hの周期毎に、図7に示すような色ムラと逆
位相の補正電流を発生させる。この時の残存する色ムラ
量は従来の図13に示す色ムラ量に比べ少ないので、電
流印加に伴う解像度劣化はほとんどない。Example 2. In the above embodiment, the optical arrangement is adopted so as to eliminate the color unevenness at the center and the corners of the screen. However, as shown in FIG. 4, color unevenness remains in other parts of the screen. This problem is solved by providing each display element with a drive current generation circuit for correcting color unevenness. This circuit generates a correction current having an opposite phase to the color unevenness as shown in FIG. 7 every 1H period of the horizontal scanning waveform shown in FIG. Since the amount of remaining color unevenness at this time is smaller than the amount of color unevenness shown in the related art shown in FIG. 13, there is almost no deterioration in resolution due to current application.
【0028】実施例3.上記二つの実施例ではスクリー
ン対角隅における色ムラがなくなるよう赤色投写光学系
の光軸を配し、電気的な手段を加えることによりスクリ
ーン全般の色ムラを解消した。しかし、緑色の照度に対
して赤、青色の照度の変動が7%以内であれば視感的に
色ムラを許容できることが経験的に分かっている。Example 3. In the above-mentioned two embodiments, the optical axis of the red projection optical system is arranged so as to eliminate the color unevenness at the diagonal corners of the screen, and the color unevenness of the entire screen is eliminated by adding electrical means. However, it is empirically known that the variation in the illuminance of red and the illuminance of blue is 7% or less with respect to the illuminance of green, and the color unevenness can be visually permissible.
【0029】このため、図10に示すようにスクリーン
中心から対角隅までの距離をS1、左右対角上任意の点
xまでの距離をS2、赤、青投写レンズ各々の右対角上
xa、左対角上xbへ入射する光線の光軸と成す角をW
11、W22とした時、(1)式を満たすよう赤、青色
光学系の光軸を配することにより、光学的配置だけでス
クリーン全般の色ムラを軽減できる。(1)の条件式は
上限を越えると対角***付近で、下限を越えると隅部
に許容値以上の色ムラを生じる。Therefore, as shown in FIG. 10, the distance from the center of the screen to the diagonal corner is S1, the distance to an arbitrary point x on the left and right diagonals is S2, and the right diagonal xa of each of the red and blue projection lenses is xa. , The angle formed with the optical axis of the ray incident on the left diagonal xb is W
By setting the optical axes of the red and blue optical systems so as to satisfy the formula (1) when the values are 11 and W22, it is possible to reduce the color unevenness of the entire screen only by the optical arrangement. If the upper limit of the conditional expression (1) is exceeded, color unevenness more than the permissible value will occur in the vicinity of the center on the diagonal, and if the lower limit is exceeded, the color unevenness will exceed the allowable value.
【0030】この時の照度分布を図3に、赤、青の色ム
ラ発生の様子を図5に示す。この時集中角5により、内
側と外側で発生する色ムラ量をほぼ等しくさせることに
より、相対照度比を7%内に納めることができる。The illuminance distribution at this time is shown in FIG. 3, and the appearance of red and blue color unevenness is shown in FIG. At this time, the concentration angle 5 allows the amounts of color unevenness generated inside and outside to be substantially equal, so that the relative illuminance ratio can be kept within 7%.
【0031】上記1から3の実施例では各投写レンズの
スクリーン入射位置はスクリーン中心を通る水平方向に
あった。しかし、集中角だけに限らず、仰角を加えて配
される投写光学系においては、図8に示すように水平方
向とはずれた12、13、14のような位置に光軸の入
射位置を設けることにより、上記と同等の効果を奏し、
スクリーン上における色ムラを軽減できる。In the above-mentioned first to third embodiments, the screen incidence position of each projection lens is in the horizontal direction passing through the center of the screen. However, not only the concentration angle but also the projection optical system in which the elevation angle is added, the incident positions of the optical axis are provided at positions 12, 13, and 14 which are deviated from the horizontal direction as shown in FIG. By doing so, the same effect as the above is achieved,
Color unevenness on the screen can be reduced.
【0032】上記1から4の実施例、及び図1、図11
では、説明のために赤色投写光学系についてだけ述べた
が、緑色光学系を介して対称に配された青色投写光学系
についても本発明が同様に適用できる。Embodiments 1 to 4 above and FIGS. 1 and 11
Then, only the red projection optical system has been described for description, but the present invention can be similarly applied to the blue projection optical system symmetrically arranged via the green optical system.
【0033】[0033]
【発明の効果】以上のように、本発明によれば集中角を
有してスクリ−ンに入射する色の光学系の光軸を、スク
リ−ン中心からずれた位置に入射するよう配したので、
スクリ−ン4隅の色ムラを容易に改善できる。As described above, according to the present invention, the optical axis of the optical system of a color having a converging angle and incident on the screen is arranged so as to be incident on a position deviated from the center of the screen. So
Color unevenness at the four corners of the screen can be easily improved.
【0034】また、電気的な補正を加えることにより、
解像度の大きな劣化をまねくことなく、スクリーン全般
に色ムラを軽減する。By adding electrical correction,
Color unevenness is reduced on the entire screen without significantly degrading the resolution.
【0035】また、(1)式を満たす範囲内で画角W1
1、W22が等しくなるよう赤、青の光軸入射位置を決
定することにより、色ムラの量を視感的な許容値内に納
め光学配置のみでスクリーン全般の色ムラを軽減でき
る。In addition, the angle of view W1 within the range satisfying the expression (1)
By determining the optical axis incident positions of red and blue such that 1 and W22 are equal to each other, the amount of color unevenness is kept within a visually permissible value, and the color unevenness of the entire screen can be reduced only by the optical arrangement.
【0036】さらに、集中角のみならず仰角をも有する
光学系に対しては、各投写レンズ光軸のスクリーン入射
位置を、スクリーン中心を通る水平軸からはずれた位置
に設けることにより、上記と同等の効果により合成映像
の色ムラを軽減する。Further, for an optical system having not only the angle of concentration but also the angle of elevation, the screen incident position of each projection lens optical axis is provided at a position deviated from the horizontal axis passing through the center of the screen. The effect of reduces the color unevenness of the composite image.
【図1】本発明の投写光学系の構成図である。FIG. 1 is a configuration diagram of a projection optical system of the present invention.
【図2】本発明による第1の実施例の照度分布図であ
る。FIG. 2 is an illuminance distribution chart of the first embodiment according to the present invention.
【図3】本発明による第3の実施例の照度分布図であ
る。FIG. 3 is an illuminance distribution diagram of a third embodiment according to the present invention.
【図4】本発明による第1の実施例の色ムラを示す図で
ある。FIG. 4 is a diagram showing color unevenness according to the first embodiment of the present invention.
【図5】本発明による第3の実施例の色ムラを示す図で
ある。FIG. 5 is a diagram showing color unevenness according to a third embodiment of the present invention.
【図6】CRTの走査波形を示す図である。FIG. 6 is a diagram showing a scanning waveform of a CRT.
【図7】本発明の色ムラ補正波形の図である。FIG. 7 is a diagram of a color unevenness correction waveform of the present invention.
【図8】本発明の仰角を有する光学系の光軸入射位置を
示す図である。FIG. 8 is a diagram showing an optical axis incident position of an optical system having an elevation angle according to the present invention.
【図9】従来の3管式プロジェクションテレビの構成図
である。FIG. 9 is a block diagram of a conventional three-tube projection television.
【図10】従来の投写光学系の構成図である。FIG. 10 is a configuration diagram of a conventional projection optical system.
【図11】従来の投写光学系の構成図である。FIG. 11 is a configuration diagram of a conventional projection optical system.
【図12】従来の投写光学系における照度分布図であ
る。FIG. 12 is an illuminance distribution diagram in a conventional projection optical system.
【図13】従来の投写光学系における色ムラを示す図で
ある。FIG. 13 is a diagram showing color unevenness in a conventional projection optical system.
【図14】投写レンズの透過光量説明図である。FIG. 14 is an explanatory diagram of an amount of transmitted light of a projection lens.
1 CRT 2 投写レンズ 3 スクリ−ン 4 光軸 5 集中角 6 スクリーン中心 7a スクリーン右上隅 7b スクリーン左上隅 11 入射位置 1 CRT 2 Projection lens 3 Screen 4 Optical axis 5 Convergence angle 6 Screen center 7a Screen upper right corner 7b Screen upper left corner 11 Incident position
【手続補正書】[Procedure amendment]
【提出日】平成4年3月16日[Submission date] March 16, 1992
【手続補正1】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図12[Correction target item name] Figure 12
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図12】 [Fig. 12]
【手続補正2】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図13[Name of item to be corrected] Fig. 13
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図13】 [Fig. 13]
Claims (4)
された投写レンズと、スクリ−ンからなり、前記投写レ
ンズのうち基準の第1のレンズは、前記スクリ−ンの中
央に光軸が入射する様配され、他の投写レンズの光軸は
前記第1の投写レンズの光軸とある角を成してスクリ−
ンに斜め入射し、スクリ−ン上で複数の表示素子の映像
を拡大合成する投写型テレビにおいて、前記他の投写レ
ンズの光軸は、スクリーン4隅部における照度の不均一
性が緩和されるよう前記基準の第1の投写レンズの光軸
と異なる位置でスクリーンに入射するよう配されたこと
を特徴とする投写型テレビ。1. A plurality of display elements, a projection lens arranged in front of each display element, and a screen. A reference first lens of the projection lenses is provided at the center of the screen. The optical axes of the other projection lenses are arranged so as to be incident, and the optical axes of the other projection lenses form an angle with the optical axis of the first projection lens to make a screen.
In a projection television that obliquely enters the screen and magnifies and combines the images of a plurality of display elements on the screen, the optical axis of the other projection lens alleviates the unevenness of the illuminance at the four corners of the screen. The projection television is arranged so as to enter the screen at a position different from the optical axis of the reference first projection lens.
一性を解消するために、前記各表示素子に補正用駆動電
流発生回路を設けたことを特徴とする請求項第1項記載
の投写型テレビ。2. The projection type apparatus according to claim 1, wherein a correction drive current generating circuit is provided in each of the display elements in order to eliminate unevenness of illuminance outside the corners of the screen 4. TV set.
S1、対角上任意の点xまでの距離をS2としたとき、
下記の式を満足するような点xにおいて、照度の不均一
性が解消されるよう、前記他の投写レンズの光軸が前記
基準の第1の投写レンズ光軸と異なる位置に入射するこ
とを特徴とする投写型テレビ。 0.5 < s2/s1 < 0.9 …(1)3. When the distance from the center of the screen to the diagonal corner is S1 and the distance to an arbitrary point x on the diagonal is S2,
At a point x that satisfies the following expression, the optical axis of the other projection lens may be incident on a position different from the reference first projection lens optical axis so as to eliminate the non-uniformity of the illuminance. A distinctive projection TV. 0.5 <s2 / s1 <0.9 (1)
ンズが集中角のみならず仰角をも有して配される光学系
において、スクリーン中心を通る水平軸からはずれた位
置に各投写レンズの光軸が入射することを特徴とする請
求項第1項記載の投写型テレビ。4. In an optical system in which the reference first lens and other projection lenses are arranged not only at a converging angle but also at an elevation angle, each projection lens is placed at a position deviated from a horizontal axis passing through the center of the screen. The projection television according to claim 1, wherein the optical axis is incident.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3283418A JP2612392B2 (en) | 1991-10-30 | 1991-10-30 | Projection TV |
US08/098,256 US5337093A (en) | 1990-12-19 | 1993-07-29 | Projection television system including a plurality of display elements with corresponding optical axes incident to a screen at different points offset from the screen center |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3283418A JP2612392B2 (en) | 1991-10-30 | 1991-10-30 | Projection TV |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05122712A true JPH05122712A (en) | 1993-05-18 |
JP2612392B2 JP2612392B2 (en) | 1997-05-21 |
Family
ID=17665277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3283418A Expired - Fee Related JP2612392B2 (en) | 1990-12-19 | 1991-10-30 | Projection TV |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2612392B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02121488A (en) * | 1988-10-31 | 1990-05-09 | Hitachi Ltd | Projection type display device |
-
1991
- 1991-10-30 JP JP3283418A patent/JP2612392B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02121488A (en) * | 1988-10-31 | 1990-05-09 | Hitachi Ltd | Projection type display device |
Also Published As
Publication number | Publication date |
---|---|
JP2612392B2 (en) | 1997-05-21 |
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