JP2778742B2 - Color picture tube equipment - Google Patents

Description

Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention relates to a color picture tube device, and is effective when displaying images of different sizes on a phosphor screen. About.

(Prior Art) Generally, as shown in FIG. 8, a color picture tube apparatus has blue, green, and red on the inner surface of a panel (1) facing a shadow mask (2) mounted inside the panel (1). A phosphor screen (3) comprising a three-color phosphor layer emitting light is formed,
Three electron beams (5B) and (5) emitted from the electron gun (4)
G) and (5R) are horizontally and vertically deflected by the deflecting device (6) to scan the phosphor screen (3), thereby forming a structure for displaying a color image on the phosphor screen (3). Have been. The shadow mask (2) is for selecting and projecting the three electron beams (5B), (5G), and (5R) onto the three-color phosphor layer, and opposing the phosphor screen (3). A large number of electron beam passage holes for selecting the electron beams (5B), (5G), and (5R) are formed on the surface to be irradiated.

In such a color picture tube device, the three-color phosphor layer is formed in a stripe shape or a dot shape, and reflection of external light is prevented in a gap between the stripe-shaped or dot-shaped three-color phosphor layers to prevent image contrast. There is a black stripe type or a black matrix type in which a non-light emitting layer containing carbon or the like as a main component is formed.
At present, the phosphor screen (3) is a black stripe type, and is combined with an electron gun (4) that emits three electron beams arranged in a line composed of a center beam and a pair of side beams. The device is widespread.

By the way, in such a color picture tube apparatus, a current TV broadcast is a method of displaying an image having an aspect ratio of 3: 4 on a phosphor screen. : 16 and high-definition broadcasting is about to be realized.
When such a broadcast is realized, actually two broadcast systems coexist, and it is necessary to selectively display two types of images having different aspect ratios on the phosphor screen of one color picture tube device. Becomes In this case, there is a portion where no image is displayed on the phosphor screen. That is, as shown in FIG. 9 (a), when an image having an aspect ratio of 3: 4 is displayed on the phosphor screen (3) having an aspect ratio of 9:16, both sides of the image display area (8), that is, horizontal. An area (9a) where no image is displayed is formed at both ends in the direction. As shown in (b), the phosphor screen (3) having an aspect ratio of 3: 4 has an aspect ratio of 9:16.
When the image is displayed, an area (9b) where no image is displayed is formed above and below the image display area (8), that is, at both ends in the vertical direction. In such an image display, the electron beam scans only the image display area (8), and the image display area (9a),
If (9b) is performed without scanning, color misregistration due to mislanding occurs for the following reasons.

That is, in order to display an image on the entire surface of the phosphor screen (3), when the electron beam is deflected so as to scan the entire surface, the electron beam collides with the entire surface of the shadow mask (2) as shown in FIG. Then, the shadow mask (2) is heated by the impinging electron beam, and the entire surface of the shadow mask (2) bulges toward the phosphor screen (3) as shown by a broken line (10). On the other hand, if an image is displayed only at the center of the phosphor screen (3) so that only the center is scanned, the electron beam collides with the shadow mask (2) only at the center. The colliding portion is heated and swells toward the phosphor screen (3) as indicated by the dashed line (11), but the peripheral portion that does not collide hardly swells. It is different from the case. Therefore, for example, in a color picture tube apparatus adjusted so that the color shift due to the doming does not occur when an image is displayed on the entire surface of the phosphor screen (3) having an aspect ratio of 9:16, the phosphor screen (3) is used. The electron beam is deflected so that only the center is scanned, and the aspect ratio is 3: 4.
When the image is displayed, a color shift due to mislanding occurs due to a difference in swelling of the shadow mask (2). Conversely, the aspect ratio is 3: 4 in the center of the phosphor screen (3).
If an adjustment is made so as not to cause a color shift due to mislanding when displaying the image of (1), a color shift occurs when an image having an aspect ratio of 9:16 is displayed on the entire surface of the phosphor screen (3). That is, it is difficult to display two types of images having different aspect ratios with one color picture tube device without mislanding, and it is inevitable that the color purity of at least one of them is deteriorated.

Further, when an image having an area smaller than the phosphor screen area is displayed on the phosphor screen (3) for a long time, the phosphor in the image display area is deteriorated, and the image is displayed on the entire phosphor screen (3). In this case, there is a difference in color tone between the area outside the area where no image is displayed and the screen quality is degraded.

(Problems to be Solved by the Invention) As described above, recently, in addition to the current TV system for displaying an image having an aspect ratio of 3: 4, a system for displaying an image having an aspect ratio of 9:16 will be realized. And When such a TV system is realized, it is necessary to display two types of images having different aspect ratios with one color picture tube device. However, if one color picture tube device is to display two types of images having different aspect ratios, there will be areas where no image is displayed at both ends in the horizontal or vertical direction depending on the aspect ratio of the phosphor screen. If this image display is performed in such a manner that the electron beam scans only the image display area and the electron beam does not scan the area where no image is displayed, at least one of the shadow mask doming caused by the collision of the electron beam is performed. Mis-landing occurs when the image is displayed, and the color purity is degraded. In addition, when an image having a smaller area than the phosphor screen is displayed for a long period of time, the phosphor in the image display area is deteriorated, and when an image is displayed on the entire phosphor screen, there is a possibility that the image outside the area is not displayed. There is a problem that a color difference is generated between them and the screen quality deteriorates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and when two types of images having different aspect ratios are selectively displayed on a phosphor screen, color purity is deteriorated due to mislanding for any of the images. An object of the present invention is to provide a color picture tube device which does not cause color difference due to the difference in the degree of deterioration of the phosphor.

[Means for Solving the Problems] In a color picture tube device having a phosphor screen provided with a plurality of phosphor layers having different emission colors and a non-light emitting layer filling a gap between the phosphor layers, emission from an electron gun is performed. In addition to the main deflecting device that deflects multiple electron beams in the horizontal and vertical directions, when displaying an image with a smaller area than the phosphor screen, the electron beam that scans the entire surface of the phosphor screen is outside the image display area. , An auxiliary deflecting device for deflecting light so as to be incident on the non-light-emitting layer of the phosphor screen was provided.

(Operation) As described above, in addition to the main deflecting device, if an auxiliary deflecting device is provided outside the image display area to deflect the electron beam for scanning the phosphor screen so as to be incident on the non-light-emitting layer, A shadow mask in a case where an image of a predetermined size can be displayed on the phosphor screen by being deflected so as to scan the entire surface of the phosphor screen by the deflecting device, and the electron beam scans only the image display area. Can be prevented from being mislanding based on local doming.

Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

FIG. 1 shows a color picture tube device according to one embodiment. This color picture tube device has an envelope comprising a substantially rectangular panel (1) and a funnel-shaped funnel (20) integrally joined to the panel (1). The above panel (1) has an aspect ratio of 9:16 and a conventional aspect ratio of 3:16.
It is longer than a panel consisting of four. A phosphor screen (3) is formed on the entire inner surface of the panel (1) so as to face the shadow mask (2) having a large number of electron beam passage holes mounted inside the panel (1). . As shown in FIG. 2, the phosphor screen (3) is a striped three-color phosphor layer (21B) extending in the vertical (longitudinal) direction formed corresponding to the electron beam passage hole of the shadow mask. , (21G), and (21R), and a non-light-emitting layer (22) mainly containing carbon or the like filling the gaps. In the neck (23) of the funnel (20), the center beam (5
G) and an in-line type electron gun (4) that emits three electron beams consisting of a pair of side beams (5B) and (5R).

Further, outside the boundary between the neck (23) and the cone (24) of the funnel (20), three electron beams (5B), (5G) and (5R) emitted from the electron gun (4) are applied. Deflection device that deflects horizontally and vertically (main deflection device)
(6) is attached, and further approaching the deflection device (6), an auxiliary deflection device (25) is provided on the phosphor screen (3) side.
Is installed.

The auxiliary deflecting device (25) deflects the three electron beams (5B), (5G), and (5R) emitted from the electron gun (4) by the deflecting device (6) to cover the entire surface of the phosphor screen (3). When an image having an aspect ratio of 3: 4 is displayed at the center of the phosphor screen (3) (aspect ratio is 9:16) by scanning as shown in FIG. In (8), as shown in FIG. 4, the three-color phosphor layers (21B) and (21B)
G), (21R), the electron beam (5B), (5
As shown in FIG. 5, G) and (5R) are used to deflect the non-light-emitting layer (22) so as to irradiate the non-light-emitting layer (22) in the region (9a) where no image is displayed at both ends in the horizontal direction. Such an auxiliary deflecting device (25) is used when the three electron beams (5B), (5G), and (5R) for scanning the phosphor screen (3) reach an area (9a) where no image is displayed, and are slightly moved. It may generate a magnetic field that deflects in the horizontal direction. For example, a pair of coils may be toroidally wound around a core.

Next, FIG. 6 shows a main configuration of a driving circuit for driving the color picture tube device. In this color picture tube device,
For example, if the video signal Is received via the antenna is input to the video signal processing circuit (27) and an image with an aspect ratio of 3: 4 is displayed at the center of the phosphor screen with an aspect ratio of 9:16, The video signal Is is compressed by a video signal processing circuit (27) to process a video signal IC described later, and when an image is displayed on the entire surface of the phosphor screen, the video signal is processed without compression to obtain a required video signal. The IC is output to a predetermined electrode of the electron gun. The video signal Is is input to a synchronizing circuit (28), and a horizontal deflection current (Ih) and a vertical deflection current (Ih) are output from a horizontal deflection circuit (29) and a vertical deflection circuit (30) by a signal sent from the synchronization circuit (28). The deflection current Iv is output to a horizontal deflection coil and a vertical deflection coil of the deflection device. An auxiliary deflection circuit (31) is connected to the video signal processing circuit (27). The video signal IC output from the video signal processing circuit (27) and the horizontal deflection circuit output from the horizontal deflection circuit (29). In synchronization with the current Ih, the auxiliary deflection circuit (31) outputs an auxiliary deflection current Id to the auxiliary deflection device (25).

FIG. 7 is a timing chart showing the relationship among the video signal Is, the video signal IC output from the video signal processing circuit (27), the horizontal deflection current Ih, and the auxiliary deflection current Id. This seventh
In the figure, the horizontal scanning cycle when scanning the entire surface of a phosphor screen having an aspect ratio of 9:16 is T1, and an image having an aspect ratio of 3: 4 is displayed at the center of the phosphor screen (3). Assuming that the horizontal scanning period of the image display area is T2, the difference ΔT between T1 and T2 formed before and after the horizontal scanning period T2 of the image display area is a period for performing horizontal scanning outside the image display portion.

Now, assuming that the signal shown in (a) is, for example, a video signal Is received via an antenna, the video signal processing circuit digitally processes the video signal Is and performs 2ΔT compression which is the difference between T1 and T2 in time. Then, a luminance signal of an appropriate size is inserted corresponding to ΔT, that is, the horizontal portion of the image display area in the horizontal direction, to generate a video signal Ic shown in FIG.
Is output to a predetermined electrode of the electron gun. In synchronization with the video signal Ic, the horizontal deflection circuit outputs a horizontal deflection current Ih shown in (c) to the deflection device. At the same time video signal processing circuit (27)
Sends a signal to the auxiliary deflecting circuit, and the auxiliary deflecting circuit generates an auxiliary deflecting current Id shown in FIG. 4D during the period ΔT, and sends the auxiliary deflecting current Id to the auxiliary deflecting device. .

As a result, this color picture tube device is equipped with an electron gun (4).
The three electron beams (5B), (5G), and (5R) emitted from the device are modulated by the video signal Ic, and are deflected in the horizontal and vertical directions by a deflecting device (6) to cover the entire surface of the phosphor screen (3). Scan and display an image with an aspect ratio of 3: 4 at the center. In particular, when scanning the phosphor screen (3) horizontally outside the image display area (8), in addition to the deflection of the deflection device (6), the auxiliary deflection device (25) is operated by the auxiliary deflection current Id. Then, 3 electron beams (5B), (5
G) and (5R) are incident on the non-light emitting layer (22).

By the way, when an image having an aspect ratio of 3: 4 is displayed at the center of the phosphor screen (3) having an aspect ratio of 9:16 as described above, the entire surface of the phosphor screen (3) is scanned, and Outside the image display area (8), when the electron beams (5B), (5G), and (5R) are incident on the non-light emitting portion (22),
Since the electron beams (5B), (5G), and (5R) irradiate the entire surface of the shadow mask (2), local doming when scanning only the image display area can be prevented. Therefore, not only when displaying an image on the entire surface of the phosphor screen (3), but also when displaying an image with a small area having an aspect ratio of 3: 4 in the center of the phosphor screen (3) as described above, an error occurs. Color shift due to landing can be prevented from occurring.

Also, the phosphor screen (3)
When the image is displayed on the upper side, it is possible to suppress the deterioration of the phosphor in the image display area (8) from progressing faster than the outside thereof, and accordingly, it is likely to occur when the image is displayed on the entire phosphor screen (3). Color differences can be made inconspicuous. That is, to describe an example of the color picture tube device, the width of the three-color phosphor layers (21B), (21G) and (21R) of the phosphor screen (3) is about 100 μm, and the width of the non-light emitting layer (22) is In the case of about 110 μm, the electron beams (5B), (5G), (5
The spot diameter of R) is about 170 μm, and the electron beams (5B), (5G), and (5R) are applied to the non-light emitting layer (22) in the area (9a) where no image is displayed as shown in FIG. Even if the light is incident, the spots of the electron beams (5B), (5G) and (5R) irradiate the adjacent portions of the phosphor layers (21B), (21G) and (21R). Therefore, the phosphor deteriorates even in the area (9a) where no image is displayed, and the difference in color tone over the entire surface of the phosphor screen (3) can be reduced. However, in this case, the emission area of the phosphor in the region (9a) where this image is not displayed is narrower than the image display portion (8a) and dimly lit, so that there is no problem in viewing the image. Absent.

Although the embodiment of the present invention has been described above, the mounting position of the auxiliary deflecting device is not limited to the phosphor screen side of the deflecting device. And may be provided so as to overlap with the deflection device.

In the above embodiment, the auxiliary deflecting device is configured to generate a deflecting magnetic field. However, the auxiliary deflecting device may be configured by an electrostatic deflecting plate that deflects an electron beam electrostatically.

In the above-described embodiment, the case where the aspect ratio is 3: 4 and the aspect ratio is displayed on the phosphor screen having the aspect ratio of 9:16 has been described.However, the present invention is also applicable to the phosphor screen having the aspect ratio of 3: 4. In other words, the present invention can be applied to a case where an image having a smaller area is displayed on the phosphor screen irrespective of the display area, for example, when displaying an image having an aspect ratio of 9:16.

[Effects of the Invention] In addition to the main deflection device that deflects a plurality of electron beams emitted from an electron gun in the horizontal and vertical directions, an electron beam that scans the phosphor screen outside the image display area is not covered by the phosphor screen. When an auxiliary deflecting device for deflecting light so as to be incident on the light emitting layer is provided, the main deflecting device deflects so as to scan the entire surface of the phosphor screen and displays an image having an aspect ratio different from the aspect ratio on the phosphor screen. And can prevent mislanding due to local doming of the shadow mask when the electron beam is deflected to scan only the image display area, and can display an image with a smaller area than the phosphor screen. The difference between the color based on the deterioration of the phosphor in the region and the color in the region where no image is displayed can be reduced, and the phosphor screen can be reduced. Even when an image is displayed on the entire surface of the image, it is possible to display a high-quality image with no noticeable difference in color tone.

[Brief description of the drawings]

1 to 7 are explanatory views of an embodiment of the present invention. FIG. 1 is a view showing a configuration of a color picture tube apparatus as one embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are respectively. FIG. 3 is a plan view and a cross-sectional view showing the configuration of the phosphor screen. FIG. 3 is a view showing an image having an aspect ratio of 3: 4 displayed on a phosphor screen having an aspect ratio of 9:16, and FIG. 5A and 5B are a plan view and a cross-sectional view, respectively, showing the incident state of the electron beam in the image display area at that time, and FIGS. 5A and 5B show the incident state of the electron beam in the area where no image is displayed. FIG. 6 is a plan view and a cross-sectional view, FIG. 6 is a diagram showing a main part of a circuit for driving the color picture tube device, and FIGS. 7 (a) to (d) are images for operating the color picture tube device, respectively. Tie indicating the relationship between signal, horizontal deflection current and auxiliary deflection current FIG. 8 is a diagram showing the configuration of a conventional color picture tube device, and FIGS. 9 (a) and 9 (b) are images each having an aspect ratio of 3: 4 on a phosphor screen having an aspect ratio of 9:16. Is displayed and the aspect ratio is
FIG. 10 is a diagram illustrating an image having an aspect ratio of 9:16 displayed on a 3: 4 phosphor screen, and FIG. 10 is a diagram illustrating doming of a shadow mask. 2 ... shadow mask, 3 ... phosphor screen, 4 ... electron gun, 5B, 5R ... pair of side beams, 5G ... center beam, 6 ... deflection device (main deflection device), 8 ... image Display area, 9a: area where no image is displayed, 21B, 21G, 21R: three-color phosphor layer, 22: non-light-emitting layer, 25: auxiliary deflection device.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-112542 (JP, A) JP-A-63-37793 (JP, A) JP-A-2-37653 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) H01J 29/70-29/76 H04N 3 / 27,9 / 28

Claims (1)

(57) [Claims] 1. A phosphor screen provided with a plurality of color phosphor layers having different emission colors and a non-light emitting layer filling a gap between the plurality of color phosphor layers, an electron gun for emitting a plurality of electron beams, and the electron gun. A main deflection device for deflecting a plurality of electron beams emitted from the main screen in the horizontal and vertical directions, and a plurality of electron beams that scan the phosphor screen by deflecting the main deflection device while being opposed to and separated from the phosphor screen by a predetermined distance. A shadow mask that is selected so as to be incident on a predetermined phosphor layer, and an electron beam that scans the phosphor screen outside an image display area obtained on the phosphor screen by scanning the electron beam. An auxiliary deflecting device for deflecting light so as to be incident on the non-light-emitting layer of the screen; and driving the auxiliary deflecting device in synchronization with the deflecting operation of the main deflecting device. Color picture tube apparatus characterized by comprising a drive unit for.