JPH099276A - Convergence adjusting device and projection television - Google Patents

Abstract

PURPOSE: To provide a convergence adjusting device which adjusts convergence in the center part and the peripheral part of a screen plate by arranging an image light receiving sensor within the visual range of the screen plate. CONSTITUTION: A first image light receiving sensor 6 is arranged at a screen holding frame 5 which forms the outer periphery of the screen plate 4. A second image light receiving sensor 6a is arranged at a turning bar 8 instructed by a servo motor 8a located at the upper part of the screen holding frame 5. A control part 7 controls an image generating part 1 so as to adjust the position of an original image on the tube surface of each of projection tubes 2R, 2G and 2B based on the brightness of the image detected by each sensor. The second image light receiving sensor 6a is enabled to turn along the surface of the screen plate, which enables convergence adjustment in the center part to be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence adjusting device and a projection television equipped with the convergence adjusting device.

[0002]

2. Description of the Related Art FIG. 10 is a schematic plan view of a convergence adjusting device in a conventional projection television.
The image signal generated by the image generation unit 1 for generating an image to be projected on the screen plate is given to the three projection tubes 2R, 2G, 2B arranged inline. Projection tube 2R (or 2G, 2B)
Is a red (or green, blue) CRT,
In order to magnify and project the image on the tube surface, it develops color with a brightness 100 times higher than that of a normal color TV direct-view tube, and an original image is generated on the tube surface based on a given image signal. The original image generated in this way corresponds to the corresponding refraction lens 3R (or 3
The image is enlarged and projected on the screen plate 4 via G, 3B) and superimposed to form a color image. The transmissive screen plate 4 has a rectangular shape and is held by a screen holding frame 5 supported by a supporting member (not shown). Then, the color image transmitted through the screen plate 4 is viewed by a viewer located in front.

The screen holding frame 5 is provided with an image light receiving sensor 6 which receives a light beam of a color image on the rear side peripheral edge thereof. The image light receiving sensor 6 is a photodiode, which detects the brightness of the received color image and gives it to the control unit 7.
Based on the lightness given by the image light-receiving sensor 6, the control unit 7 adjusts the position of the image light-receiving sensor 6 and the position of the original image on the tube surface of the projection tube so that the lightness at the peripheral portion becomes the brightest. A deflection voltage is determined and applied to the image generation unit 1 to move the position of the original image on the tube surface. The color shift at the position of the image light receiving sensor 6 and its peripheral portion is corrected, and the determined horizontal and vertical deflection voltages are stored in a memory (not shown). In this way, the lightness becomes lighter than the lightness when the color images of the three primary colors match and there is a color shift, and the convergence is corrected.

[0004]

Since the conventional convergence adjusting device is constructed as described above, the color shift of the outer peripheral portion of the screen plate can be corrected, but the color shift of the center portion of the screen plate which is most noticeable is corrected. There was a problem that could not be corrected. The present invention has been made in order to solve such a problem, and the convergence adjustment for adjusting the convergence in the central portion and the peripheral portion of the screen plate by disposing the image light receiving sensor in the visible range of the screen plate. The purpose is to provide a device.

[0005]

A convergence adjusting device according to a first aspect of the present invention is a convergence adjusting device for adjusting convergence based on the brightness of a color image obtained by enlarging and projecting original images on display surfaces of a plurality of projection displays on a screen plate. In the apparatus, a first image light receiving sensor which is arranged on the outer periphery of the screen plate on the projection display side and receives the light beam of the original image, and a rotating member which is supported by a fulcrum located on the outer periphery of the screen plate and extends along the surface of the screen plate. A movable rotating rod and a second image light receiving sensor which is disposed on the rotating rod and receives the light beam of the original image, and has the brightness of the color image detected by the first and second image light receiving sensors. It is characterized in that the convergence is adjusted based on the above.

The convergence adjusting device according to the second aspect of the invention is characterized in that the fulcrum is located at an upper outer periphery and / or a lower outer periphery of the screen plate.

A convergence adjusting apparatus according to a third aspect of the present invention is a convergence adjusting apparatus for adjusting convergence based on the brightness of a color image obtained by enlarging and projecting an original image on a display surface of a projection display on the screen surface of the screen plate. Along with a moving rod that moves in the vertical or horizontal direction, and a plurality of image light-receiving sensors arranged on the moving rod to receive the light rays of the original image, and the brightness of the color image detected by the image light-receiving sensor It is characterized in that the convergence is adjusted based on the above.

A convergence adjusting device according to a fourth aspect of the present invention comprises a light-shielding film that covers the screen plate and a winding portion that winds or unwinds the light-shielding film, and a moving rod is provided at an edge portion of the light-shielding film. Characterize.

A projection television according to a fifth aspect of the invention is characterized by including the convergence adjusting device according to any one of claims 1 to 4.

[0010]

In the first and second inventions, the first image light receiving sensor detects the lightness of the image in the peripheral portion of the screen plate, and the second image light receiving sensor detects the lightness of the image in the central portion of the screen plate. Therefore, the brightness of the image on the inner surface of the screen plate is detected by both the image receiving sensors.

In the third aspect of the invention, the plurality of image light receiving sensors move in the vertical or horizontal direction of the screen plate and detect the brightness of the image at the moved point. Therefore, the brightness of the image is detected with high accuracy over the entire moving area where the image light receiving sensor moves along the surface of the screen plate.

In the fourth aspect of the invention, the plurality of image light receiving sensors move in the vertical or horizontal direction of the screen plate to detect the brightness of the image at the moved points. Therefore, the brightness of the image is detected with high accuracy over the entire moving area where the image light receiving sensor moves along the surface of the screen plate.
Then, since the light blocking film blocks the light rays of the image whose color shift has not been corrected yet, the disturbed image for which the convergence adjustment has not been completed is blocked.

According to the fifth aspect of the invention, in the projection television, the brightness of the image is detected in the central portion and the peripheral portion of the screen plate, the convergence adjustment is performed, and a screen without color shift can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a schematic side view of a convergence adjusting device in a projection television according to the first embodiment, and FIG. 2 is a schematic rear view of a screen plate. The image signal generated by the image generation unit 1 for generating an image to be projected on the screen plate is given to the three projection tubes 2R, 2G, 2B arranged inline. Projection tube 2R (or 2
(G, 2B) is a red (or green, blue) monochromatic cathode ray tube, and in order to magnify and project the image on the tube surface, it develops with a brightness of about 100 times higher than that of a normal color TV direct-view tube and gives it. An original image is generated on the tube surface based on the obtained image signal. The original image generated in this way is the corresponding refraction lens 3R
(Or 3G, 3B) is projected on the screen plate 4 in an enlarged manner and superimposed to form a color image. The transmissive screen plate 4 has a rectangular shape and is held by a rectangular screen holding frame 5 supported by a supporting member (not shown). Then, the color image transmitted through the screen plate 4 is viewed by a viewer located in front.

The screen holding frame 5 faces the three projection tubes 2R, 2G, 2B on the back side thereof and has first image receiving sensors 6, 6 ... Which receive the light beam of the color image at four corners and four sides. Prepare for the center. A servo motor 8a is provided on the upper part of the rear side of the screen holding frame 5 with its rotation axis on the projection tube 2R, 2G, 2B side, and the rotation axis of the rotation rod 8 is about half the length of the side of the screen plate 4 on the rotation axis. Is installed vertically. A second image light receiving sensor 6a, which faces the three projection tubes 2R, 2G, and 2B and receives the light beam of the color image, is provided at the tip of the second light receiving sensor 6a, and the light beam of the color image is received. First and second image receiving sensors 6,
A photodiode 6a detects the brightness of the received color image and supplies it to the control unit 7. The control unit 7 controls the image generation unit 1 to adjust the position of the image on the tube surface of the projection tube based on the given brightness.

The servo motor 8a rotates the rotary rod 8 to adjust the convergence when the convergence is not performed.
2 is parallel to the upper side of the screen plate 4 and is on the left side of the servomotor 9a in FIG.

Next, convergence adjustment will be described. The control unit 7 controls the servo motor 8a to position the rotating rod 8 vertically to the upper side of the screen plate 4 and position the second image light receiving sensor 6a at the center of the screen plate 4. The image generation unit 1 generates a convergence adjustment signal for projecting and forming red, green, and blue cross marks at the positions of the respective image sensors 6, 6 ... 6a, and supplies it to each of the three projection tubes 2R, 2G, 2B. Then, the cross images of the three primary colors are simultaneously enlarged and projected.

The nine image light-receiving sensors 6, 6 ... 6a give the detected brightness to the control unit 7. Based on the brightness given by the eight first image receiving sensors 6, 6 ..., the control unit 7 gives the whiteness of the peripheral portion of the screen plate 4 to be the brightest, and is also given by the second image receiving sensor 6a. Based on the brightness, the horizontal and vertical deflection voltages are set to adjust the position of the cross image on the tube surface of the projection tube so that the brightness of the central portion of the screen plate 4 becomes white and brightest, and the horizontal and vertical deflection voltages are given to the image generation unit 1 To move. By repeating the generation of the convergence adjustment signal, the detection of the brightness of the cross image, and the determination of the horizontal / vertical deflection voltage, the optimum horizontal / vertical deflection voltage for correcting the color misregistration is determined and stored in a memory (not shown). .

When a color image is projected, such as when receiving a television broadcast, the image generator 1 generates an image to be projected based on the horizontal / vertical deflection voltage stored in the memory. As a result, an image having no color misregistration is enlarged and projected in the central portion and the peripheral portion of the screen plate 4. In the present embodiment, the rotating rod 8 is provided on the back side of the screen plate 4, but it goes without saying that it may be provided on the front side of the screen plate.

FIG. 3 is a schematic side view of the convergence adjusting device in the projection television according to the second embodiment, and FIG. 4 is a schematic rear view of the screen plate. In this embodiment, the rotating rod 8 and the second rotation rod 8 of the first embodiment are used.
In addition to the image light receiving sensor 6a, a rotating rod 9 and a second image light receiving sensor 6b are provided below the screen plate 4.
That is, the rotation rod 9 having a length of about half the length of the side of the screen plate 4 and having the second image receiving sensor 6b at its tip is provided by the servo motor 9a provided at the center of the back side of the screen holding frame 5. Rotate and use a photo sensor and three projection tubes
The lightness of the color image received by the second image receiving sensor 6b facing 2R, 2G, 2B is detected and given to the control unit 7. In this embodiment, there are three positions for lightness measurement by the second image receiving sensors 6a, 6b. That is, the rotating rod 8 (or 9) is rotated along the surface of the screen plate 4 by the servo motor 8a (or 9a), and is parallel to the upper side (or lower side) of the screen plate 4 when convergence adjustment is not performed. Servo motor 8a (or 9a) in 4
It is located on the left side of the screen and is rotated counterclockwise from the position when convergence adjustment is not performed.
It is located at a position rotated by 45 °, 90 ° and 135 ° (or clockwise).

When the convergence adjustment is performed, the first image receiving sensor 6 determines 8 positions, the second image receiving sensor 6a determines 3 positions, and the second image receiving sensor 6b determines 3 positions. It is possible to detect the brightness of the color image at 14 positions on the screen of the enlarged and projected color image. Since other configurations are the same as those in FIG. 1 or FIG. 2, corresponding parts are designated by the same reference numerals and description thereof is omitted. In this embodiment, the rotating rods 8 and 9 are rotated to 45 °, 90 ° and 135 ° so that the light receiving positions are all three, but the number is not limited to three. It goes without saying that the color misregistration can be corrected in detail by setting the number of positions to four or more and correspondingly setting the number of positions where the image light-receiving sensor receives light to 16 or more. Further, although the rotating rods 8 and 9 are provided on the back side of the screen plate 4, it goes without saying that they may be provided on the front side of the screen plate 4.

FIG. 5 is a schematic perspective view from the back side of the screen plate 4 of the convergence adjusting device in the projection television according to the third embodiment. In this embodiment, three image light-receiving sensors 6c, 6c, 6c are provided at the upper portion, the center portion and the lower portion of the screen plate 4, and a vertical moving rod 12 is provided. It is configured to move to. The moving rod is slightly lower than the height of the screen plate 4, and its upper and lower ends are attached to a single guide wire 13 that moves in the left and right directions at the upper and lower sides of the screen holding frame 5, respectively. Two pulleys 11b, 11d and 11e, 11g are provided on the upper and lower corners of one side of the screen holding frame 5 (on the right side of FIG. 5), and on the other side (upper and lower sides of the left side of FIG. 5). 1 in each corner) Pulley 11
c, 11f are provided, and a pulley 11a is attached to the output shaft of a motor 10 provided in an appropriate space between the screen holding frame 5 and the projection tubes 2R, 2G, 2B. The guide wire 13 is stretched from the pulley 11a back to the pulley 11a via six pulleys 11b, 11c, 11d, 11e, 11f and 11g located at the four corners of the screen holding frame 5. The outputs of the image receiving sensors 6c, 6c, 6c are given to the control unit 7.

When the convergence adjustment is not performed, the moving rod 12 is positioned so as to overlap one side of the screen holding frame 5 in FIG. 5 so as not to interfere with the light reception of the screen plate 4. When performing convergence adjustment, use the motor 10
11a is rotated to stop the moving rod 12 at n positions, and the lightness of the cross image is detected and the deflection voltage is adjusted and stored at each position in the same manner as described above. As a result, the convergence adjustment is performed based on the lightness at 3 × n positions. Since other configurations are the same as those in FIG. 1 or FIG. 2, corresponding parts are designated by the same reference numerals and description thereof is omitted. In this embodiment, although there are three image receiving sensors, it is possible to adjust the convergence at many positions.

In this embodiment, the moving rod 12 is provided with three image light receiving sensors 6c, but it is needless to say that the number is not limited to three, and four or more can be provided. Further, although the moving rod 12 is provided on the back side of the screen plate 4, it goes without saying that it may be provided on the front side of the screen plate 4.

FIG. 6 is a schematic perspective view from the back side of the screen plate of the convergence adjusting device in the projection television according to the fourth embodiment. In this embodiment, the movable rod 12a is arranged horizontally so as to move up and down, and the image receiving sensors 6d, 6d, 6d are arranged side by side in the left-right direction. Since other configurations are similar to those of the third embodiment of FIG. 5, corresponding parts are designated by the same reference numerals and description thereof will be omitted.
In the present embodiment, the moving rod 12a is provided with three image light receiving sensors 6d, but the number is not limited to three and may be four or more. Further, although the moving rod 12a is provided on the back side of the screen plate 4, it goes without saying that it may be provided on the front side of the screen plate 4.

FIG. 7 is a schematic side view of the convergence adjusting device in the projection television according to the fifth embodiment, and FIG. 8 is a schematic rear view of the screen plate. Like the fourth embodiment, this embodiment is provided with a vertically movable horizontal moving rod 12b and image light receiving sensors 6e, 6e, 6e provided on the moving rod 12b. A winding machine that winds up and stores a light shielding film 14 that shields the light rays of a color image enlarged and projected on the screen plate 4.
The movable bar 12b is fixed to the lower end edge of the light shielding film 14 by including 15. The winder 15 winds or winds the light shielding film 14 by a motor (not shown). When the light-shielding film 14 is unwound from the winder 15, the moving bar 12b provided at the edge of the light-shielding film 14, that is, the lower edge of the light-shielding film 14 is located along the lower part of the screen holding frame 5, The light shielding film 14 covers the entire surface of the screen plate 4 and shields the light rays of the color image.

Guide rails 16 and 16 are provided on the left and right sides of the screen holding frame 5, and the ends of the moving rod 12b are slidably engaged with the guide rails. Convergence adjustment is started from here, and the light shielding film 14 is sequentially wound up and stopped at n points in the vertical direction. Then, the convergence adjustment is performed by detecting the brightness of the cross image in the same manner as described above. When the convergence adjustment is completed, the moving rod 12b is located along the upper portion of the screen holding frame 5.

On the side of the screen plate 4 of the light-shielding film 14, the characters "under convergence adjustment" are written as shown in FIG. Therefore, during the adjustment of the convergence, the word "convergence adjusting" appears on the screen plate. This also has the advantage that the unadjusted and unsightly cross image is not seen by the viewer.
Since other configurations are the same as those in FIG. 6, corresponding parts are designated by the same reference numerals and description thereof will be omitted.

In this embodiment, the moving rod 12b is provided with three image light receiving sensors 6e, but the number is not limited to three, and four or more may be provided. Winding machine
15 may be provided on one side of the screen holding frame 5, and the light shielding film 14 may be extended to the other side. Needless to say, the winder 15 may be provided on the front side of the screen plate 4.

[0030]

According to the first and second aspects of the present invention, since the brightness of the image is detected in the peripheral portion and the central portion of the screen plate, there is an excellent effect of performing the convergence adjustment on the inner surface of the screen plate.

According to the third aspect of the invention, it can be used so as to detect the brightness of the image in the moving range in which the image light receiving sensor moves along the surface of the screen plate, and the accuracy is high in many points of the screen plate. It has an excellent effect of adjusting the convergence.

According to the fourth aspect of the invention, the lightness of the image is detected on the entire surface of the moving area where the image light receiving sensor moves along the surface of the screen plate, and the light rays of the image whose color misregistration has not been corrected are shielded by the light shielding film. Therefore, there is an excellent effect of performing highly accurate convergence adjustment without showing the state of color misregistration during the convergence adjustment to the viewer.

According to the fifth aspect of the invention, since the brightness of the image is detected on the inner surface of the screen plate and the convergence adjustment is performed, there is an excellent effect that an image having no color shift is viewed on the inner surface of the screen plate.

[Brief description of drawings]

FIG. 1 is a schematic side view of a convergence adjustment device according to a first embodiment.

FIG. 2 is a schematic rear view of the screen plate shown in FIG.

FIG. 3 is a schematic side view of a convergence adjusting device according to a second embodiment.

FIG. 4 is a schematic rear view of the screen plate shown in FIG.

FIG. 5 is a schematic perspective view from the back side of the screen plate of the convergence adjusting device according to the third embodiment.

FIG. 6 is a schematic perspective view from the back side of the screen plate of the convergence adjusting device according to the fourth embodiment.

FIG. 7 is a schematic side view of a convergence adjusting device according to a fifth embodiment.

8 is a schematic rear view of the screen plate shown in FIG. 7. FIG.

9 is a schematic diagram showing the front surface of the light shielding film shown in FIG. 7. FIG.

FIG. 10 is a schematic plan view of a conventional convergence adjustment device.

[Explanation of symbols]

1 image generation unit, 2R, 2G, 2B projection tube, 3R, 3G, 3B refraction lens, 4 screen plate, 5 screen holding frame, 6, 6a, 6b, 6c, 6d, 6e image light receiving sensor, 7 control unit, 8 , 9 rotating rods, 12, 12a, 12b moving rods, 14 light-shielding films.

Claims (5)

[Claims] 1. A convergence adjusting device for adjusting convergence based on the brightness of a color image obtained by enlarging and projecting original images on display surfaces of a plurality of projection displays on a screen plate, wherein a convergence adjustment device is provided on the outer periphery of the screen plate on the projection display side. A first image light-receiving sensor which is arranged to receive the light beam of the original image, a rotatable rod which is supported by a fulcrum located on the outer periphery of the screen plate and which is rotatable along the surface of the screen plate, and which is arranged on the rotatable rod. And a second image light receiving sensor that receives the light beam of the original image, and is configured to adjust the convergence based on the brightness of the color image detected by the first and second image light receiving sensors. 2. The convergence adjusting device according to claim 1, wherein the fulcrum is located at an upper peripheral portion and / or a lower peripheral portion of the screen plate. 3. A convergence adjusting device for adjusting convergence based on the brightness of a color image obtained by enlarging and projecting an original image on a display surface of a projection display on a screen plate, wherein the convergence adjusting device extends vertically or horizontally along the surface of the screen plate. A moving rod that moves and a plurality of image light receiving sensors that are arranged on the moving rod and receive the light rays of the original image are provided, and the convergence is adjusted based on the brightness of the color image detected by the image light receiving sensor. A convergence adjuster. 4. A light shielding film for covering the screen plate, and a winding portion for winding or unwinding the light shielding film,
The convergence adjusting device according to claim 3, wherein a moving rod is provided at an edge portion of the light shielding film. 5. A projection television equipped with the convergence adjusting device according to claim 1.