JP2004334037A - Projection type color image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type color image display device whose thickness can be reduced to the depth dimension nearly equal to the depth dimension of furniture. <P>SOLUTION: When the concentration angle of the axes of a red projection type cathode ray tube and a blue projection type cathode ray tube with respect to their axial direction of a projection type cathode ray tube for green is defined as θ, the dimension in the diagonal direction of a screen is defined as H, and the depth dimension of the projection color image image display device is defined as D, setting is performed to satisfy relation of θ≤109.3×(D/H)-21.3, θ≥(-92.0)×(D/H)+42.2, and (D/H)≤0.354. Consequently, the projection color image image display is made thinner in the thickness to the depth dimension nearly equal to the depth dimension of the furniture. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a projection type color image display device used for a projection television, a video projector, and the like, and particularly to a projection type color image display capable of realizing a thinner device by reducing the depth of the device body to the depth of furniture. It concerns the device.
[0002]
[Prior art]
2. Description of the Related Art A projection type color image display device such as a projection type TV receiver generally uses three projection type cathode ray tube devices dedicated to displaying red, green and blue primary color images, respectively, and these three projection type cathode ray tube devices are used. Are enlarged and projected on a screen using an optical lens or a mirror, and the three primary color images are superimposed on the screen to form a color image. Incidentally, as the projection type cathode ray tube, a type having a phosphor screen diagonal dimension of 5.5 inches or 7 inches is used. In a projection type color image display device, a screen diagonal dimension of 40 inches or 50 inches is used. The type of the type is used.
[0003]
In recent years, the most typical 50-inch projection type color image display device is becoming the mainstream, and the diagonal dimension of the screen display area is about 1270 mm, and the depth dimension of the device is about 600 mm or more. It has a structure having a certainty.
[0004]
Therefore, when such a projection type color image display device is installed indoors, if it is arranged side by side on furniture or the like arranged along the wall side, the depth dimension of the furniture or the like is usually about 450 mm. Therefore, when this projection type color image display device is installed side by side with furniture, the projection type color image display device is disposed so as to protrude greatly from the arrangement surface to the near side because of its large depth dimension. .
[0005]
The arrangement relationship between furniture installed indoors and the projection type color image display device is described in Non-Patent Document 1 below, for example.
[0006]
[Non-patent document 1]
Page 671 of Asia Display / IDW'01 (A New CRT and DY System for Slim Tube with 120-degree Deflection Angle)
[Problems to be solved by the invention]
However, in recent years, the projection type color image display devices are arranged side by side in the room with the same feeling as furniture, and it is possible to appreciate the image on the large screen display. There is a demand for a projection-type color image display device that must be used. Furthermore, while maintaining various characteristics of high image quality and high performance, a projection type color image display device capable of viewing a large screen image on the same surface as the arrangement surface of the furniture, with a reduced depth dimension and a reduced thickness. Had been requested.
[0008]
In addition, hitherto, a structure that solves these problems has not been disclosed at all.
[0009]
Therefore, the present invention has been made in order to solve the above-described problem, and an object of the present invention is to provide a projection type color image display device capable of realizing a reduction in thickness to a depth approximately equal to the depth of furniture. To provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a projection type color image display in which three projection type cathode ray tubes are horizontally arranged on the same plane so that a green projection type cathode ray tube is installed at the center. In the apparatus, the concentration angle on the screen of the tube axis of the projection cathode ray tube for red and the projection cathode ray tube for blue with respect to the tube axis direction of the projection cathode ray tube for green is θ, and the diagonal dimension of the screen is θ. Is H, the depth dimension of the projection type color image display device is D, and the variable is X,
θ ≦ 109.3 × (D / H) −21.3
θ ≧ (−92.0) × (D / H) +42.2
(D / H) ≦ X
By setting so as to satisfy the relationship, the depth is reduced to a depth substantially equal to the depth of furniture.
[0011]
Further, in another projection type color image display device according to the present invention, by setting the X to 0.354, the depth dimension of the projection type color image display device is reduced to a thickness approximately equal to the depth size of furniture. .
[0012]
Further, in still another projection type color image display device according to the present invention, by setting the X to 0.341, the depth dimension of the projection type color image display device is reduced to a thickness approximately equal to the depth size of furniture. You.
[0013]
Further, in another projection type color image display device according to the present invention, by setting the above X to 0.328, the depth dimension of the projection type color image display device is reduced to approximately the same as the depth size of furniture. .
[0014]
Further, in another projection type color image display device according to the present invention, by setting X to 0.369, the depth dimension of the projection type color image display device is reduced to approximately the same as the depth size of furniture. .
[0015]
It should be noted that the present invention is not limited to the above configuration and the configuration of the embodiment described later, and it is needless to say that various modifications can be made without departing from the technical idea of the present invention.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic front view illustrating an embodiment of a projection type color image display device according to the present invention, and FIG. 2 is a schematic sectional view of FIG. 1 as viewed from a side. In these figures, a projection lens LNS is attached via a coupler CPL to a panel of a projection type cathode ray tube PRT installed below the projection type color image display device, and a panel surface of the projection type cathode ray tube PRT is provided. Is enlarged by a projection lens LNS, and is projected on a screen SCR provided on the front side by a mirror MIR provided on the back side.
[0017]
The projection type color image display device configured as described above can substantially reduce the projection distance from the panel surface of the projection type cathode ray tube PRT to the screen SCR, can reduce the depth dimension, and can reduce the thickness of the projection. A color image display device can be configured. According to such a configuration, a projection type color image display device with high definition and high image quality can be obtained.
[0018]
FIG. 3 is a schematic diagram illustrating an example of an image display method of the above-described projection type color image display device. FIG. 3 is a schematic diagram in which the optical axis of light emitted from the cathode ray tube shown in FIG. 2 is developed on a straight line. By interposing the mirror MIR in the middle of the light emitted from the cathode ray tube of FIG. 3, the cathode ray tube and the screen can be arranged as shown in FIG. In FIG. 3, rPRT, gPRT, and bPRT are projection cathode ray tubes for red, green, and blue, respectively, PNL is a panel that is an image forming unit of each of the projection cathode ray tubes rPRT, gPRT, and bPRT described above, LNS is a projection lens, SCR is a projection screen. In the same figure, on the central axis of the projection type cathode ray tube gPRT for green, a projection screen SCR is disposed substantially vertically at a position opposed to the panel PNL surface and separated by a predetermined projection distance L. I have.
[0019]
The other red-type projection cathode ray tube rPRT and the blue-type projection cathode ray tube bPRT are arranged on the same plane on both sides of the green projection type cathode-ray tube gPRT, and their tube axes are projected. On the screen SCR, it is fixed at an angle θ so as to coincide with the tube axis of the above-mentioned central green projection type cathode ray tube gPRT. Here, this angle is referred to as a concentration angle θ. On the front surface of each panel PNL of the projection cathode ray tubes rPRT, gPRT, bPRT, a projection lens LNS is arranged on the same line as the tube axis of each projection cathode ray tube rPRT, gPRT, bPRT, and formed on each panel PNL. The color image is formed and displayed by enlarging the projected single color image, projecting it on the screen SCR, and superimposing it.
[0020]
FIG. 4 is a schematic diagram showing an arrangement of three projection type cathode ray tube devices in the projection type color image display device.
In the projection type color image display device according to the present invention, each of the necks of the projection type cathode ray tubes rPRT, gPRT, bPRT deflects the electron beam of each projection type cathode ray tube to form a raster image on its display surface. Also, a deflection device 20 including a vertical deflection coil and a convergence correction device 21 for converging an electron beam and correcting a color shift are attached. The image displayed on each of the projection cathode ray tubes is enlarged by the red, green, and blue projection lenses LNS provided corresponding to each of the projection cathode ray tubes rPRT, gPRT, and bPRT, and the rear side of the screen SCR. Is reflected by a mirror MIR (not shown) installed at The image reflected by the mirror MIR is projected and formed on the rear surface of a transmissive screen SCR attached to an opening of a cabinet serving as a housing.
[0021]
The red, green, and blue projection cathode ray tubes rPRT, gPRT, and bPRT display red, green, and blue images on their fluorescent display surfaces, respectively, and have a concentration angle θ in the horizontal direction. They are arranged side by side. At this time, the projection CRT gPRT for green is disposed at the center, and the projection CRT rPRT for red and the projection CRT bPRT for blue respectively sandwich the projection CRT gPRT for green. It is arranged on the left and right at a concentration angle θ.
[0022]
In the projection type cathode ray tubes rPRT, gPRT, and bPRT for red, green, and blue, the display positions of red, green, and blue on the screen SCR are shifted because the optical positions with respect to the screen SCR are slightly different. This situation will be described with reference to FIG. In the sectional view shown in FIG. 2, the mirror MIR is provided for the purpose of reducing the depth dimension of the cabinet, but FIG. 5 shows an optically equivalent arrangement diagram. As shown in FIG. 5, a projection type cathode ray tube gPRT for green color and a projection lens LNS thereof are provided at a position directly opposite to the screen SCR.
[0023]
On the other hand, the projection type cathode ray tube rPRT for red and the cathode ray tube bPRT for blue are provided with projection lenses LNS, respectively, and their optical axes are indicated by broken lines 31 and 32. The angle formed by both optical axes is referred to as a concentration angle, which is represented by an angle 33, and the angle is θ. Light rays connecting the left and right ends of the projection type cathode ray tube rPRT for red and the image of the end of the screen SCR are represented by solid lines 34 and 35, respectively. When the solid line 34 and the solid line 35 are compared, the solid line 35 is longer, that is, the projection distance is longer.
[0024]
Similarly, the projection distance of the projection type cathode ray tube bPRT for blue is symmetrically increased. That is, since the raster images projected from the projection type cathode ray tube rPRT for red and the cathode ray tube bPRT for blue on both sides have an angle θ with respect to the normal line of the screen SCR, the raster image is on the right side with respect to the center screen image. The screen distance is different between the left side and the raster image on the screen SCR is distorted and trapezoidal. As a result, the size of the raster image displayed on the screen SCR is left and right unbalanced, and as a result, a trapezoidal distortion as shown in FIG. 6 occurs.
[0025]
In FIG. 6, CR indicates a center raster image obtained by the projection CRT gPRT for green, and SR indicates a side raster image obtained by the projection CRT rPRT for red and a cathode ray tube bPRT for blue. Assuming that the size of the raster image CR is V and the size of the side raster image SR is Vmin, the image is displayed with a trapezoidal distortion factor A = Vmin / V.
[0026]
In order to match the distortion of the trapezoidal raster image with the central raster image, a correction device (not shown) is provided at the neck portion of the projection cathode ray tube rPRT for red and the cathode ray tube bPRT for blue, and each of the correction devices For example, a correction is performed by applying a sawtooth current having a vertical period to the laser beam.
[0027]
Here, if the trapezoidal distortion ratio A is smaller than 0.82, it becomes difficult to correct the distortion of the side raster image SR on the screen SCR when the supply of the sawtooth current by the correction device is insufficient. The trapezoidal distortion factor A decreases as the above-mentioned concentration angle θ increases, and the difference between the left and right distances from the distance L decreases when the distance L from the panel PNL surface to the screen SCR decreases even at the same concentration angle θ. Since the ratio increases, the trapezoidal distortion A decreases. Then, when the relationship between the concentration L and the distance L at which the trapezoidal distortion factor A becomes 0.82 or more is obtained, the concentration angle θ is expressed by the following equation (1).
θ ≦ 0.0209 × L + 1.9918 (1)
It turned out that. This region of the concentration angle θ is a region below the line shown in FIG.
[0028]
2. Description of the Related Art In recent years, in the field of projection type color image display devices used for home use, in a region where a screen diagonal dimension (diagonal dimension of a screen display area) is about 1020 mm (nominal 40-inch type) or less, direct-view projection is performed. Shaped cathode ray tubes occupy the majority of the market, and are in an advantageous position in terms of price and performance. In a region where the screen diagonal dimension is about 1520 mm (nominal 60-inch type) or more, it is difficult to increase the market share because the cabinet is too large. Therefore, in the projection type color image display device, an area where the diagonal size of the screen belonging to the intermediate portion is about 1270 mm (nominal 50 inch type) is a main market.
[0029]
In a screen diagonal dimension of about 1270 mm (nominal 50 inch type), which is a main product area of the projection type color image display device, the raster image size on the display screen of the projection type cathode ray tube is about 127 mm. The horizontal raster image size at this time is about 111 mm (raster ratio: horizontal: vertical = 16: 9). Further, the thickness of the panel of the projection type cathode ray tube is about 8.5 mm. If the thickness of the panel of the projection type cathode ray tube becomes thin, the strength of the projection type cathode ray tube against destruction becomes weak, so that it is impossible to make it thinner than this size.
[0030]
Further, when the size of the raster image is reduced, the luminance saturation of the phosphor becomes remarkable, and the luminance on the screen decreases. In addition, if the current value is increased to improve the brightness, the beam spot diameter increases, and the raster image size decreases, and the beam spot diameter relative to the raster image size increases significantly, resulting in a significant reduction in resolution. I do. For this reason, it is difficult to greatly reduce the size of the raster image.
[0031]
Therefore, the minimum value of the horizontal dimension of the projection type cathode ray tube panel is the horizontal dimension of the projection type cathode ray tube panel = the horizontal raster image size + the thickness of the projection type cathode ray tube panel × 2, which is about 128 mm. . Here, when the horizontal dimension of the projection type cathode ray tube panel is taken into consideration, the minimum value of the concentration angle θ with respect to the distance L is obtained, and the concentration angle θ is equal to or greater than the minimum value. This relationship is expressed by the following equation (2).
θ ≧ (−0.01759) × L + 22.795 (2)
It becomes. This region of the concentration angle θ is a region above the line shown in FIG.
[0032]
In a projection type color image display device using one mirror, a mirror is arranged so that an image is projected at right angles to a substantially vertical screen, and an image turned back by the mirror is further transmitted to a projection type cathode ray tube. When the projection type cathode ray tube is arranged so as not to be interrupted by the provided optical lens, the minimum value of the distance L is proportional to the depth dimension D of the projection type color image display device, and is the same as that of the same projection type color image display device. In the case of the depth dimension D, it is inversely proportional to the diagonal dimension of the screen. Therefore, when the relationship between the minimum value of the distance L, the depth dimension D, and the diagonal dimension H of the screen is obtained, the distance L is expressed by the following equation (3).
L = 5230 (D / H) -1114 (3)
It turned out that. This distance L is as shown by the line in FIG.
[0033]
Substituting the relationship of the above formula (3) into the above formulas (1) and (2) to obtain the relationship between the concentration angle θ, the depth dimension D, and the diagonal dimension H of the screen, the following equation (1) is obtained. Therefore, the concentration angle θ is
θ ≦ 109.3 × (D / H) −21.3 (4)
From equation (2), the concentration angle θ is
θ ≧ (−92.0) × (D / H) +42.2 (5)
It turns out that it becomes.
[0034]
Further, the depth dimension of the furniture is about 450 mm, and the depth dimension of the projection type color image display device according to the present invention which is installed in a room needs to be about 450 mm or less. In the case of a projection screen color image display device having a main screen diagonal dimension of about 1270 mm (nominal 50 inch type), the relationship between the depth dimension D and the diagonal dimension H of the screen is expressed by the following equation (6). It becomes.
(D / H) ≦ 0.354 (6)
[0035]
FIG. 10 shows the relationship among the above-described equations (4), (5) and (6). In FIG. 10, a range G indicated by a hatched portion satisfies the above-described equations (4), (5), and (6). The projection type color image display device according to the present invention comprises: a concentration angle θ of the tube axes of the red projection cathode ray tube and the blue projection cathode ray tube with respect to the tube axis direction of the green projection cathode ray tube; and a diagonal dimension of the screen. By setting H and the depth dimension D of the projection type color image display device to the range indicated by the hatched portion, no problem occurs in image characteristics such as focus characteristics and distortion, and the projection type color image display device can be installed indoors. It can be seen that it is possible to make the dimensions of the cabinet without any problem when the image display device is arranged.
[0036]
FIG. 11 is a view for explaining another embodiment of the projection type color image display device according to the present invention. In FIG. 11, the relationship between the depth dimension D and the diagonal dimension H of the screen, that is, (D / H) ≦ 0.341, in addition to the relationship of the above-described equations (4) and (5). Accordingly, a projection type color image display device having a nominal size of 52 inches with a screen diagonal dimension of 1320 mm can be realized. By setting (D / H) ≦ 0.328, it is possible to realize a projection type color image display device of a nominal 54 inch type having a screen diagonal dimension of 1372 mm. Further, by setting (D / H) ≦ 0.369, it is possible to realize a nominal 48-inch projection type color image display device having a screen diagonal dimension of 1219 mm.
[0037]
According to such a configuration, even if the furniture is arranged side by side in the same sense as the furniture, the furniture does not protrude from the arrangement surface, and the furniture can be arranged substantially on the same surface.
[0038]
Further, in the above-described embodiments, the projection type color image display devices of the nominal 48-inch type, the nominal 50-inch type, the nominal 52-inch type and the nominal 54-inch type have been described. The present invention is not limited to this, and it goes without saying that a projection type color image display device in the vicinity of these inches can be realized.
[0039]
【The invention's effect】
As described above, according to the projection type color image display device of the present invention, a projection type of a large screen display in which the depth dimension is reduced to a depth dimension substantially equal to the depth dimension of furniture while maintaining high definition and high image quality. An extremely excellent effect that a color image display device can be easily manufactured can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing a configuration of a projection type color image display device according to the present invention.
FIG. 2 is a schematic cross-sectional view as viewed from the side of FIG.
FIG. 3 is a schematic diagram illustrating an example of a display method of a projection type color image display device according to the present invention.
FIG. 4 is a configuration diagram showing an embodiment of a projection type color image display device according to the present invention.
FIG. 5 is a diagram illustrating the occurrence of trapezoidal distortion.
FIG. 6 is a diagram illustrating the definition of trapezoidal distortion.
FIG. 7 is a diagram illustrating a relationship between a concentration angle θ at which a trapezoidal distortion rate is 0.82 and a distance L from a panel surface to a screen.
FIG. 8 is a diagram illustrating a relationship between a concentration angle θ and a distance L from a panel surface to a screen.
FIG. 9 is a diagram illustrating a relationship between a depth dimension D of the cabinet / diagonal dimension H of the screen and a distance L from the panel surface to the screen.
FIG. 10 is a diagram showing a relationship between a depth dimension D of a cabinet / diagonal dimension H of a screen and a concentration angle θ.
FIG. 11 is a diagram illustrating a relationship between a depth dimension D of a cabinet / diagonal dimension H of a screen and a concentration angle θ.
[Explanation of symbols]
PRT Projection cathode ray tube CPL Coupler LNS Projection lens MIR Mirror SCR Screen rPRT Projection cathode ray tube gPRT for red Projection cathode ray tube bPRT for green Projection cathode ray tube PNL for blue Panel CR Center raster SR Side raster 20 Deflection device 21 Convergence correction device

Claims (5)

Three projection cathode ray tubes for displaying red, green, and blue images, respectively;
A projection lens that is provided corresponding to each of the projection type cathode ray tubes, and that enlarges and projects an image displayed on the projection type cathode ray tube,
A mirror for receiving an image projected by the projection lens,
A screen for imaging the image reflected by the mirror,
A projection type color image display device, wherein the three projection type cathode ray tubes are horizontally arranged in the same plane so that the green projection type cathode ray tube is installed at the center,
The angle of concentration of the tube axes of the red projection cathode ray tube and the blue projection cathode ray tube on the screen with respect to the tube axis direction of the green projection cathode ray tube is θ, and the diagonal dimension of the screen is H. When the depth dimension of the projection type color image display device is D and the variable is X,
θ ≦ 109.3 × (D / H) −21.3
θ ≧ (−92.0) × (D / H) +42.2
(D / H) ≦ X
The projection type color image display device is set so as to satisfy the following relationship. 2. The projection type color image display device according to claim 1, wherein said X is 0.354. 2. The projection type color image display device according to claim 1, wherein said X is 0.341. 2. The projection type color image display device according to claim 1, wherein said X is 0.328. 2. The projection type color image display device according to claim 1, wherein said X is 0.369.

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