JPH08228320A - Cathode-ray tube device - Google Patents

Abstract

PURPOSE: To obtain an image in which no incongruity occurs in a boundary by performing the vertical scan of cathode-ray tubes neighboring in a vertical direction by over-deflecting scan, providing time difference in its deflecting scan signal and reproducing continuously an image at an approaching part on a screen within the afterglow time of a phosphor. CONSTITUTION: Five apertures 4 in a direction of X and three apertures 4 in a direction of Y are formed on a rear plate 2, and a funnel 5 in which an electron gun 16 is arranged is joined with each aperture 4, and a phosphor screen 8 is provided on the internal face of a face plate 1. Since horizontal scanning speed is fast when each deflector 17 deflects the electron beam of each electron gun 16 in the horizontal and vertical directions, no luminance difference between adjacent areas in the horizontal direction is prominent, however, a joint is prominent since vertical scanning speed is slow. Therefore, a reproduced image on a joint part is reproduced continuously within the afterglow time of the phosphor by performing the vertical deflecting scan of the devices 17 neighboring in the vertical direction by the over-deflecting scan and providing the time difference in the deflecting scan signal. In this way, the joint is prevented from being prominent by cutting a video signal at an over-deflecting scanning part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device which scans one screen portion which is continuously formed by dividing it into a plurality of areas.

[0002]

2. Description of the Related Art A method for displaying a high-resolution large screen by arranging a plurality of independent small cathode ray tubes has been disclosed in the prior art.
No. 8-90428, JP-A-49-21049 and JP-A-53-117130. However, this type of cathode ray tube device is effective when constructing a huge screen with a large number of divisions arranged outdoors, but when constructing a medium-sized large screen with a screen size of about 40 inches, The joints of the image display areas of the respective cathode ray tubes are conspicuous, and the displayed image becomes difficult to see. In particular, when used as a television receiver for home use or a graphic display terminal device for computer-aided design (CAD), the appearance of a joint in a display image is a fatal defect.

On the other hand, US Pat. No. 3,071,706, JP-B-39-25641 and JP-B-42-4.
In Japanese Patent Laid-Open No. 928 and Japanese Patent Laid-Open No. 50-17167, a phosphor screen of a plurality of cathode ray tubes is integrated into one continuous phosphor screen, and the phosphor screen is used as a neck of a plurality of funnels. There is shown a cathode ray tube device which displays a single composite image by dividing an area into a plurality of areas and scanning the area by electron beams emitted from a plurality of electron guns arranged inside.

[0004]

According to the multi-neck type cathode ray tube device having such an integrated screen structure, the display in the cathode ray tube device of the type in which a plurality of independent cathode ray tubes are arranged. The cathode ray tube device can display a fairly easy-to-see image by eliminating the image junction. However, in this type of cathode ray tube device, since the areas to be divided and scanned are extremely close to each other and adjacent to each other, slight differences in brightness, contrast, hue, and the like become conspicuous.

That is, in general, when evaluating an image, absolute evaluation thereof is not easy, but relative evaluation can be evaluated extremely sensitively. Therefore, when the two images are arranged close to each other, it is necessary to completely match the brightness, contrast, hue, and the like. Furthermore, these brightness,
It was found that even if the contrast and the hue are perfectly matched, the reproduction time difference between adjacent images still gives a feeling of strangeness.

That is, generally, a cathode ray tube device reproduces an image by horizontally and vertically scanning a phosphor screen by deflecting an electron beam emitted from an electron gun by a deflecting device in horizontal and vertical directions. The horizontal deflection frequency is significantly higher than the vertical deflection frequency. For example NT
In the case of the SC system, the vertical deflection frequency is as low as 60 Hz with respect to the horizontal deflection frequency of 15.75 kHz, and the horizontal deflection frequency is about 260 times higher than the vertical deflection frequency. The electron beam emitted from the electron gun by this horizontal deflection frequency horizontally scans the phosphor screen, and the phosphor emits light. The horizontal scanning time of the electron beam is equal to the afterglow time of the emitted phosphor. Since the levels are almost the same, even a cathode ray tube device that scans an integrated phosphor screen by dividing it into a plurality of regions does not give a feeling of strangeness to images displayed in horizontally adjacent regions. However, for images displayed in vertically adjacent regions, the vertical scanning time is significantly longer than the horizontal scanning time and longer than the afterglow time of the phosphor, which gives a feeling of strangeness.

The present invention has been made to solve the above problems, and scans one continuous screen portion by dividing it into a plurality of regions by electron beams emitted from a plurality of electron guns. In the cathode ray tube device, one image obtained by synthesizing the images reproduced in the respective areas is displayed by scanning one ordinary screen portion with an electron beam emitted from one electron gun. As with the cathode ray tube device, it is a first object to obtain an image with no discomfort.

It is a second object of the present invention to provide a cathode ray tube device which displays an image having a brightness equal to or higher than that of a normal cathode ray tube device and which is light and has a short depth and which displays a high resolution and high brightness image. .

[0009]

According to the present invention, a plurality of small cathode ray tubes having at least a screen portion, an electron gun portion and a deflecting portion are arranged and the screen portions are integrated, and each small cathode ray tube is an electron. The present invention relates to a cathode ray tube device for deflecting and scanning an electron beam from a gun part in a first direction and a second direction by a deflecting part to draw a raster on each predetermined part of the screen part. Of the scanning and the scanning in the second direction, the deflection of each small cathode ray tube in the scanning with the slower scanning speed is overdeflected than the predetermined portion of the screen portion, and is adjacent in the direction with the slower scanning speed. The deflection scanning signals of the two small-sized cathode ray tubes that are operated have a predetermined time difference.

In the present invention, since the normal scanning is slower in the vertical direction than in the horizontal direction, the vertical scanning of two vertically adjacent small cathode ray tubes is over-deflected.
And since the deflection scanning signal is provided with a time difference, the reproduced image in the vertical direction in the adjacent portion on the screen is continuously reproduced within the afterglow time of the phosphor,
There is no sense of discomfort in the human eyes. At this time, the electron beam may be physically shielded or the video signal may be cut off in the portion which is overdeflected and scanned.

Thus, in the cathode ray tube device in which the integrated screen is divided and scanned into a plurality of small areas, the reproduced image synthesized in the vertical direction with a small deflection frequency is reproduced by one conventional cathode ray tube device. In the same manner as described above, it is possible to obtain one reproduced image with no discomfort. If the horizontal and vertical scans are reversed,
Since the horizontal scanning becomes slower than the vertical scanning, it suffices to allow a predetermined time difference between adjacent horizontal scannings.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on embodiments with reference to the drawings. FIG. 1 shows the overall construction of a color cathode ray tube device which is one embodiment of the present invention, and FIG. 2 shows an exploded perspective view thereof.

This cathode ray tube device has a substantially rectangular flat glass face plate 1, a substantially rectangular flat glass rear plate 2 facing the face plate 1 in parallel, and the face plate 1 and the rear. A vacuum envelope including a side wall 3 substantially vertically bonded to a peripheral portion of the plate 2 and a plurality of funnels 5 bonded around each of a plurality of openings 4 formed in the rear plate 2. Have a vessel. Particularly, in the illustrated example, a total of 15 openings 4 are formed in the rear plate 2 in the horizontal direction (X-axis direction) and three in the vertical direction (Y-axis direction), and around each of the openings 4. It is shown that 15 funnels 5 are joined.

On the inner surface of the face plate 1 of this vacuum envelope, there are vertically striped three-color phosphor layers which emit blue, green and red light, and vertical layers provided between these three-color phosphor layers. A phosphor screen 8 (screen portion) including a black stripe elongated in the direction is provided. Further, a shadow mask 9 is arranged inside the phosphor screen 8 so as to face the phosphor screen 8. In order to suppress the purity drift due to thermal expansion, the shadow mask 9 is divided into a plurality of, in the illustrated example, five shadow mask pieces 10a to 10e in the horizontal direction, and each of the shadow mask pieces 10a to 10e is a rear plate. 2 First mask erection means 1 having U-shaped cross section fixed to both ends of the inner surface in the vertical direction
The second mask erection means 12 having a U-shaped cross section, which is attached in a state where tension is applied by 1, and which is fixed to the inner side of the first mask erection means 11 at a predetermined interval. It is held in parallel. A plurality of supporting means 13 are arranged between the face plate 1 and the rear plate 2. The supporting means 13 is a flat face plate 1 and a rear plate 2 of the vacuum envelope.
Is for supporting an atmospheric pressure load applied to the rear end of the phosphor screen 8. The base end of the columnar body is fixed to the rear plate 2, and the wedge-shaped end is a black stripe of the phosphor screen 8. Touches. Further, inside the neck 15 of each funnel 5, an electron gun 16 that emits three electron beams is arranged. Further, a deflection device 17 is arranged outside each funnel 5.

Such a cathode ray tube device is manufactured as follows. First, the phosphor screen 8 is previously formed on the inner surface of the face plate 1 by the photolithography method. Further, the first and second mask erection means 11 and 12 and the support means 13 are positioned on the inner surface of the rear plate 2 and fixed by frit glass. Then, the shadow mask pieces 10a to 10a of the shadow mask 9 divided in advance are attached to the first mask erection means 11 fixed to the rear plate 2.
Weld while applying tension to 10e. The electron gun 16 is sealed in each neck 15 of the plurality of funnels 5. Then, using an assembly jig, a face plate 1 on which these phosphor screens 8 are formed, a rear plate 2 to which a shadow mask 9, supporting means 13, etc. are attached, a funnel 5 and a side wall in which the electron gun 16 is sealed. 3 are combined in a predetermined relationship, and these are integrally joined by frit glass. And it manufactures by exhausting the envelope obtained by this joining.

As another method of manufacturing this cathode ray tube device, the electron gun 16 is sealed after the funnel 5 is bonded to the rear plate 2, or the side wall 3 is bonded to the face plate 1 or the rear plate 2 in advance. It can be manufactured by various methods such as placing.

In this cathode ray tube device, the three electron beams emitted from each electron gun 16 arranged in the neck 15 of each funnel 5 are arranged so as to be concentrated on the phosphor screen 8, respectively. The three electron beams emitted from each electron gun 16 are deflected by the magnetic field generated by the deflecting device 17 arranged outside each funnel 5, and the phosphor screen 8 is divided into a plurality of regions via the shadow mask 9.
In the illustrated example, scanning is performed by dividing into 15 regions R1 to R15, five in the horizontal direction and three in the vertical direction. Then, the images drawn on the phosphor screen 8 by this divisional scanning are connected by signals applied to the electron guns 16 and the deflecting device 17, so that one large composite image without breaks or overlaps is formed on the entire surface of the phosphor screen 8. Formed into the resulting structure.

The reproduction of this image in the case of the NTSC system will be described in detail. That is, in a normal cathode ray tube device that reproduces an image by scanning a phosphor screen with three electron beams emitted from one electron gun, the three electron beams emitted from the electron gun are emitted at one point in the center of the screen. Then, the three electron beams are deflected by the magnetic field generated by the deflecting device, and the entire surface of the screen is scanned to reproduce the image. Therefore, as shown in FIGS. 3 and 4, when the horizontal scanning frequency fH0 and the vertical scanning frequency fV0 are set on the image receiving side 20 (image receiving side) in response to the signal transmitted from the transmitting side 19 (camera side). In the NTSC system, interlacing is performed at fH0 = 15.75 kHz fV0 = 60 Hz, and 2s0 = 525 scanning lines 21 are drawn on the screen. In reality, not all 525 scanning lines are drawn on the phosphor screen due to the blanking period or overscanning, but here, for convenience of explanation, it is assumed that all 525 scanning lines are drawn. To do.

In this case, since interlacing is performed, an image reproduced by one vertical scanning is formed by s0 = 262.5 scanning lines 21 (field scanning), which is 1/60 second. Is going.

That is, without considering the blanking period, one scanning line 21 is horizontally scanned at a speed of 1 / (60 × 262.5) = 1/15750 seconds (line scanning). 21 to 1
Draw 262.5 lines at even intervals in the vertical direction in 60 seconds. This field scan is performed twice to reproduce one complete image (field scan). The reason why the field scanning is performed twice in this way is to prevent flicker from being felt.

By the way, as in the cathode ray tube device of this example, a plurality of electron guns 16 are provided, and one continuous phosphor screen 8 is provided in a plurality of areas by the three electron beams emitted from each electron gun 16. For example, in the case of dividing into 15 regions R1 to R15 for scanning, the respective regions R1 to R15 are simultaneously scanned as shown by the arrow 23 in FIG. 5, so that the brightness of the entire screen can be gained. Therefore, it is preferable. in this case,
The number 2s1 of scanning lines in each region R1 to R15 is a number obtained by dividing the number 2s0 of all scanning lines in one frame by the number NV of divisions in the vertical direction of the screen, assuming that they are evenly distributed in the vertical direction of the screen. , 2s1 = 2s0 / NV = 525/3 = 175.

Therefore, assuming that the vertical scanning frequency of each of the areas R1 to R15 is fV1, the field scanning time of each of the areas R1 to R15 is the same as the field reproduction time of the entire screen.
In this case, the vertical scanning frequency fV1 of each of the areas R1 to R15
Is set to 60 Hz, which is the same as the vertical scanning frequency fV0 of the main image sent from the transmission side, the time loss of the reproduced image is eliminated, which is very convenient.

Therefore, if the number of scanning lines and the vertical scanning frequency are determined, the horizontal scanning frequency fH1 of each region R1 to R15 is determined.
Is determined as follows: fH1 = S1 * fV0 = (S0 / NV) * fV0 = S0 * fV0 / NV = fH0 * NV. Therefore, assuming that the vertical scanning frequency fV1 of each region R1 to R15 is 60 Hz, the horizontal scanning frequency fH1 of each region R1 to R15 is the horizontal scanning frequency fH0 (=
15.75 kHz) divided by one in the vertical direction, that is, 1/3 in the case of the illustrated example, which is only 5.25 kHz.

On the other hand, in order to make the images reproduced in the respective areas R1 to R15 seamless and continuous, the respective areas R1 to R15 are over-scanned and physically blocked so that the over-scanned areas do not appear on the screen. Means may be provided, or the video signal may be cut when the electron beam scans the overscan portion. By overscanning the respective regions R1 to R15 in this manner, the images reproduced in the respective regions R1 to R15 can be seamlessly and continuously made.

At this time, as described above, the respective regions R1 to R15 are
Even if the horizontal scanning frequency fH1 of the above becomes 5.25 kHz, which is one-hundredth of the number of vertical divisions of the horizontal scanning frequency fH0, it is still about 90 times as large as the vertical scanning frequency fV1 of 60 Hz. Therefore, since the horizontal scanning speed of the electron beam is high, the difference in luminance between the horizontally adjacent regions is not noticeable to human eyes. On the other hand, the vertical scanning frequency fV1
Is as small as 60 Hz, and the vertical scanning speed of the electron beam is slow. Therefore, when a brightness difference occurs between vertically adjacent regions, the seam is conspicuous, which is a fatal defect of this type of cathode ray tube device.

Therefore, in the cathode ray tube device of this example, the joint between the vertically adjacent regions is eliminated by the following method. That is, in FIG. 6, the effective portion (image display portion) of the first row regions R1, R6 and R11 which are vertically divided into three and are adjacent to each other is shown by a solid line 24, and the overscan region for these regions R1, R6 and R11 is shown. As indicated by a broken line 25, the electron beam has vertical deflection signal waveforms IV1, IV6, IV1, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV8, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6, IV6 in FIG.
With IV11, vertical scanning is performed while repeating horizontal scanning so as to draw a zigzag. So for vertical scanning,
In the region R1, in response to overscanning (overdeflection), the a'position of the overscanning region passes through the a position of the effective region, and the b position of the effective region is overdeflected to the b'position of the overscanning region, and again. Return to the a'position. Similarly, in the region R6, after passing from the position c'of the over-scanning region to the position c of the effective region, it is excessively deflected from the position d of the effective region to the position d'of the over-scanning region and returns to the position c '. In the region R11, the e'position in the overscan area is changed to the e in the effective area.
After passing through the position, it is excessively deflected from the f position in the effective area to the f ′ position in the overscan area, and returns to e ′ again.

Vertically adjacent regions R1, R6, R11
Assuming that such scanning is performed simultaneously,
For example, considering the regions R1 and R6, when scanning the position a above the effective range of the region R1 shown in FIG. 6, the region R6 also scans the position c above the effective range,
When the effective area of the region R1 has been scanned and is located at the b position below it, the region R6 is also located at the d position below it after scanning the effective area of the region R6. Next, the electron beam that has finished scanning the effective area of the region R1 returns to the upper part of the region R1 after a blanking period from the b'position of the overscan region and starts scanning from the a'position of the overscan region. Then, the light emission of the phosphor layer due to the beam landing starts when the position a in the effective area is reached. Similarly, the electron beam that has finished scanning the region R6 also returns to the upper part of the region R6 after a blanking period from the d'position in the overscan region and starts scanning from the c'position in the overscan region. Then, when the light reaches the position c in the effective area, the light emission of the phosphor layer due to the beam landing starts.

Therefore, at the boundary between the regions R1 and R6, the image projected by the electron beam scanning the effective region of the region R1 at a predetermined speed is interrupted at the boundary, and after a while, the effective region of the region R6. Scanning will start and the image will start to appear.

This is a phenomenon caused by a blanking period and a time loss due to overscan performed to connect the image signals in the regions R1 and R6 well. That is, from the emission of the phosphor layer at the position b of the effective area of the region R1 to the emission of the phosphor layer at the position c of the effective area of the region R6, the electron beam is d below the effective area of the region R6. From position to overscan area d '
It takes time to reach the upper c position after passing through the position and the upper c'position, and this time is much longer than horizontal deflection and cannot be covered by the afterglow of the phosphor, resulting in the vertical direction. The border of the area adjacent to is noticeable to human eyes.

However, in the cathode ray tube device of this example, regions R1 and R of the first row which are vertically divided into three and are adjacent to each other in FIG.
6, waveforms IV1 and I of the vertical deflection signal for scanning R11
As shown by V6 and IV11 with the same time axis t, at a certain time t1, as shown in FIG. 6, for the region R1, the α1 position of the effective region and for the region R6, the effective region α1 is detected. The electron beam scans the β1 position and, for the region R11, the γ1 position near the lower f position of the effective area. That is, the positions of the regions R1, R6 and R11 which are slightly displaced are scanned.

Therefore, when scanning the position of f at the bottom of the effective area of the region R11, in the regions R1 and R6, the positions close to α1 and β1 of the effective area are scanned, respectively, and the bottom of the effective area is not reached yet. . Next, the electron beam scanning the region R11 passes the position f at the lower part of its effective area, and f '
At time t2 when scanning the γ2 position extremely close to the position, the α2 position closer to the b position of the effective range than the α1 position for the region R1 and the β2 closer to the d position of the effective region than the β1 position for the region R6. Scan position. Further area R11
At the time t3 when the electron beam for scanning the γ3 position in the overscan region above the region R11 after the blanking period,
For 1, the α3 position closer to the b position in the effective range than the α2 position is scanned, and for the region R6, the β3 position closer to the d position in the effective range than the β2 position is scanned. That is, at this time t3, the scanning position β3 of the region R6 and the scanning position γ3 of the region R11 are almost the same position. However, in this case, since the electron beam scanning the region R11 is physically shielded or the video signal is cut, an image is displayed on the screen at the β3 position by only the electron beam scanning the region R6. Γ3 by electron beam scanning region R11
No image is displayed at the position.

Further at time t4, for region R1,
The α4 position closer to the b position in the effective range than the α3 position is
For the region R6, the β4 position near the d'position of the overscan region is scanned after passing the d position of the effective region. Area R at this time
With respect to 11, as described at the time t3, the electron beam that has scanned the γ3 position in the overscan region scans the γ4 position near the e position above the effective region of the region R11. Therefore, at this time t4, the scanning position β4 of the region R6 and the scanning position γ4 of the region R11 are almost the same position. And the region R
Since the electron beam for scanning 6 is physically shielded or the video signal is cut off, an image is displayed at the position of γ4 on the screen by the electron beam for scanning the region R11, and the electron for scanning the region R6 is scanned. No image is displayed at the β 4 position by the beam.

That is, at the boundary between the regions R6 and R11, the electron beam scanning the effective area of the region R6 reaches the boundary and disappears, and at the same time, the electron beam scanning the overscan area of the region R11. Scan the boundary area, and apparently the electron beam scanning the effective area of the region R6 continues to scan the effective area of the region R11 at the same scanning speed. As a result, in the eyes of the human, the region R6 to the region R
Images appear to connect to 11 quite naturally. That is, the vertical deflection signals IV1 and IV6 in the regions R6 and R11 have a predetermined time difference T.
If 0 is provided and the image signals to be added to the electron beams for scanning the respective regions R6 and R11 are combined, these regions R6,
The boundary of R11 can be connected in a completely imperceptible manner.

The image connection at the boundary between the regions R6 and R11 is made as shown in the region R1 as shown at the times t4 to t6.
, R6 is also performed at the boundary. Therefore, the region R1
.About.R15, the vertical deflection signals IV1 to IV16 of the adjacent regions R1 to R15 are provided with a predetermined time difference T0, and the image signals to be added to the electron beams for scanning the regions R1 to R15 are matched to each other. It is possible to display one combined image that does not give a sense of discomfort by connecting the boundaries of the regions R1 to R15 so that they cannot be sensed completely.

In the above embodiment, when one continuous phosphor screen formed on the inner surface of the face plate is divided into 5 areas in the horizontal direction and 3 areas in the vertical direction for a total of 15 areas for scanning. However, the division of this region is not limited to the above embodiment, and the number of divisions in the horizontal and vertical directions may be changed as appropriate depending on the size of the entire phosphor screen and the size of one divided region. . Further, the divided areas do not necessarily have to have the same size.

In the above embodiment, the case where all the plurality of regions are simultaneously scanned has been described, but the plurality of regions may be simultaneously scanned at least in the same column adjacent in the vertical direction. Of course, it is not necessary to scan all areas simultaneously.

Further, in the above embodiment, the face plate and the rear plate of the envelope are flat, and the supporting means is provided between the face plate and the rear plate to support the atmospheric pressure load applied to the face plate and the rear plate. Although the cathode ray tube device having the arrangement described above has been described, the present invention does not have a flat face plate or rear plate,
For example, the present invention can be applied to a case where the face plate has a curved surface, or a cathode ray tube device that does not require a supporting means for supporting an atmospheric pressure load.

Further, in the above embodiment, the cathode ray tube device in which the first and second mask erection means having U-shaped cross sections are fixed to the rear plate and the shadow mask is attached to these mask erection means has been described. This mask erection means may have another structure, and can also be applied to a case where it is fixed to a side wall other than the rear plate.

Further, in the above embodiment, the electron beams emitted from the plurality of electron guns are deflected by the magnetic fields generated by the deflecting devices, but the electron beams may be deflected by electrostatic deflection.

Furthermore, in the above embodiment, the case of transmitting a signal by the NTSC system has been described, but the cathode ray tube device of the present invention can be used for other PAL, SECAM, HD,
The present invention is also applicable to HD-MAC and the case of double speed use. That is, these methods are the same as the NTS described in the above embodiment.
As in the C method, the horizontal deflection frequency and the vertical deflection frequency are different from each other, but in each case, the vertical deflection frequency is larger than the horizontal deflection frequency, and the flicker of the screen is caused by the vertical deflection frequency. The same effect can be obtained by applying the method.

In the above embodiment, a shadow mask is arranged so as to face the phosphor screen formed on the inner surface of the face plate, and the phosphor screen is moved by three electron beams emitted from a plurality of electron guns. Although the color cathode ray tube device which divides and scans into a plurality of regions has been described, the present invention is not limited to such a color cathode ray tube device, but for example, an electron gun is used as an electron gun that emits one electron beam. Japanese Patent Application No. 60-82567 and Japanese Patent Application No. 60-2749 configured to display a color image by minutely deflecting one electron beam emitted from a gun.
It is also applicable to the cathode ray tube device described in the specification of No. 59. Further, not only the color cathode ray tube device but also a monochrome cathode ray tube device for displaying a monochrome image can be applied.

In particular, an index type color cathode line configured to display a color image by finely deflecting each one electron beam emitted from a plurality of electron guns by an index signal and scanning a plurality of regions. In the case of using a tube device, γ2 shown in Figs.
At the position of γ3 or γ3, or the position of β2 or β3, it suffices to shield only the electron beam scanning the overscan area or cut the video signal, and a seamless color image can be synthesized very easily.

In the above embodiment, the horizontal deflection scanning is performed in the same direction from right to left in all the small areas. However, the present invention is not limited to this, and reciprocal scanning may be performed from right to left and left to right. Good.

Further, in the above-described embodiment, the scanning of each small area is such that the first direction is horizontal and the second direction is vertical, but the present invention is not limited to this, and the first direction is vertical and the second direction is vertical. The present invention can also be applied to the case of scanning in the horizontal direction. In this case, horizontal scanning adjacent to each other in the horizontal direction may have a predetermined time difference.

[0045]

The present invention has at least a screen portion,
A plurality of small cathode ray tubes having an electron gun portion and a deflection portion are arranged and a screen portion is integrated, and each of the small cathode ray tubes has an electron beam emitted from the electron gun portion by the deflection portion.
In a cathode ray tube device that deflects and scans in the first direction and the second direction to draw a raster on each predetermined portion of the screen portion, in the scanning in the first direction and the scanning in the second direction, the scanning with the slower scanning speed is performed. In the above, the deflection of each small cathode ray tube is over-deflected by scanning over a predetermined portion of the screen portion, and the deflection scanning signals of the two small cathode ray tubes adjacent in the direction of slower scanning speed have a predetermined time difference. With this, it is possible to continuously reproduce the reproduced image at the boundary between two regions adjacent to each other in the slow scanning direction within the afterglow time of the phosphor, and eliminate discomfort at the boundary of the composite image. it can. Therefore, in a cathode ray tube device that scans one continuous screen portion by dividing it into a plurality of areas, a conventional composite image is emitted from one electron gun in the direction of low deflection frequency. Similar to the cathode ray tube device that reproduces one image by scanning with the generated electron beam, it is possible to obtain an image that does not give a feeling of strangeness. Also,
1 by the electron beam emitted from one conventional electron gun
It is possible to display with a brightness equal to or higher than that of a cathode ray tube device that scans two screens, thereby making it lighter, shorter in depth,
The cathode ray tube device with high resolution and high brightness and high practicality can be obtained.

[Brief description of drawings]

FIG. 1 (a) is a perspective view of a color cathode ray tube device according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view taken along line BB thereof.

FIG. 2 is an exploded perspective view of the color cathode ray tube device shown in FIG.

FIG. 3 is a diagram for explaining a relationship between a transmitting side and an image receiving side according to the NTSC system in a plurality of divided and scanned regions of the color cathode ray tube device.

FIG. 4 is a diagram for explaining scanning on the image receiving side according to the NTSC method.

FIG. 5 is a diagram for explaining a case of simultaneously scanning a plurality of divided areas of the color cathode ray tube device.

FIG. 6 is a diagram for explaining scanning of adjacent areas which are divided in the vertical direction of the color cathode ray tube device.

FIG. 7 is a diagram showing a vertical deflection signal when the color cathode ray tube device is vertically divided and all adjacent regions are simultaneously scanned at the same time.

FIG. 8 is a diagram showing a vertical deflection signal in the case where adjacent regions which are divided in the vertical direction of the color cathode ray tube device are scanned with a time shift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 8 ... Phosphor screen 9 ... Shadow mask 16 ... Electron gun 17 ... Deflection device 21 ... Scanning lines R1 to R15 ... Region

Claims (1)

[Claims] 1. A plurality of small cathode ray tubes having at least a screen portion, an electron gun portion and a deflecting portion are arranged and the screen portion is integrated, and each of the small cathode ray tubes is an electron from the electron gun portion. In a cathode ray tube device for deflecting and scanning a beam in a first direction and a second direction by the deflecting unit to draw a raster on each predetermined portion of the screen unit, the scanning in the first direction and the second direction The deflection of each of the small cathode ray tubes in the scanning of the slower scanning speed is performed by overdeflection scanning than the predetermined portion of the screen portion, and two adjacent scans in the direction of the slower scanning speed are performed. A cathode ray tube device, wherein deflection scanning signals of a small cathode ray tube have a predetermined time difference.