JPS62176036A - Index system color picture tube - Google Patents

Abstract

PURPOSE:To obtain color images, with large size, high luminance and high resolution, easy to see, by scanning multiple small regions divided from a screen part separately and discriminating the index signal from the central part of each small region and the index signal from the neighborhood of the periphery of said small region. CONSTITUTION:An index system color picture tube 1 equips a faceplate 3 with a screen part 2, nicks 5-1-5-12 connected with the faceplate 3 through it funnel 4, small electron gun parts 6-1-6-12 fitted within the necks 5 and deflecting yoked 7-14-7-12 and besides the funnel 4 equips a light receiving window 8 and a photoelectric converter 9. The screen part 2 equips phosphor 10 with phosphor stripes R, G, B as one group and index stripes 13, and the pitch Pp of the stripes 13 in the neighborhood of the separate scanning end part in each divided small region is formed to be one half of the pitch PA in other parts of the screen part. By doing so, it is possible to discriminate the index signal from the central part of each small region and the index signal from the neighborhood of its boundary between the neighboring small regions and scan the divided small region separately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an index type color picture tube, and particularly to its structure and phosphor screen.

[Technical background and problems of the invention]

In recent years, there have been many demands and studies on color picture tubes for use in high-brightness, high-definition, large-sized color picture receivers for high-quality broadcasting, or large-sized ultra-high-resolution graphic display devices for computer terminals.

Increasing the resolution of a color picture tube can generally be achieved by reducing the diameter of the electron beam spot on the phosphor screen.
Efforts have been made to increase the diameter and elongate the beam, but an electron beam sporae with a sufficiently small diameter has not yet been put into practical use.

The main reason for this is that the distance between the electron gun and the phosphor screen becomes longer as the tube becomes larger, and the electron optical magnification of the electron gun becomes too large. That is, in order to achieve larger size and higher resolution, it is important to shorten the distance between the electron gun and the phosphor screen. Furthermore, in this case, the method of shortening the distance between the electron gun and the phosphor screen by wide-angle deflection is not a good idea because it increases the difference in electro-optical magnification of the electron lens between the center and the periphery of the screen.

In addition, with regard to increasing the brightness of color picture tubes, as the tube becomes larger, the electron beam density on the screen surface decreases, resulting in a significant decrease in brightness of 4f as the tube becomes a puppet tube.

Therefore, in shadow mask type color picture tubes, II
J) Attempts have been made to increase the lateral acceleration voltage or increase the cathode current, but as a result, the resolution decreases due to distortion of the electron beam spot on the screen surface, the color purity decreases due to thermal deformation of the shadow mask, and the cathode High brightness and large size have not yet been achieved at the same time due to various problems such as deterioration of characteristics.

Further, the difficulty in increasing the brightness of such a shadow mask type color picture tube is largely due to the shadow mask itself, and the biggest factor is that the electron beam transmittance of the shadow mask is about 20%.

In other words, approximately 80% of the total electron beam energy emitted from the electron gun to cause the phosphor to emit light is lost in the shadow mask, and in reality only a portion of the total electron beam energy contributes to the excitation of the phosphor to emit light. This results in a significant decrease in the luminous efficiency of the phosphor relative to the total electron beam energy emitted from the gun.

In addition, the energy lost and absorbed by the shadow mask causes thermal deformation in the shadow mask.

The shadow mask, which is originally provided for the purpose of color selection, is not sufficiently effective and the purity of one color is reduced.

Therefore, in order to increase the luminous efficiency of the phosphor with respect to the total electron beam energy emitted from the electron gun, the shadow mask was removed, and an index stripe with color selection applied to the phosphor screen was used, and photoelectric conversion was performed to receive the light emitted from the index stripe. Beam index type color picture tubes have been proposed for a long time, which perform color switching by distinguishing between the color picture tube and the device.

However, in this type of color picture tube, the electron beam spot diameter (or the horizontal width of the spot) scanned on the video screen is required to be equal to or less than the phosphor stripe width of each color over the entire screen.

In order to satisfy such conditions for the electron beam spot over the entire screen area, the larger the tube, that is, the larger the distance from the screen to the electron gun, the more difficult it becomes.

In other words, in the beam index color picture tube, the luminous efficiency of the phosphor for all the electron beam energy emitted from the electron gun is much higher than in the shadow mask color picture tube, making it easier to realize a high-brightness color picture tube. However, it is clear that it is extremely difficult to extend this method to large pipes.

In addition to the beam index type color picture tube, there is a method of arranging a plurality of small or medium-sized color picture tubes vertically and horizontally to display a large screen with high brightness and high resolution. Publication No. 1987-'13
This method has been proposed in Japanese Patent Application Laid-open No. 49-64872, Japanese Utility Model Publication No. 49-26029, and the like. This type of method is effective for large screen displays with a large number of divisions, such as outdoors, but in the case of a medium-sized screen display with a display screen size of about 40 inches, the joints of the screen for each division area are conspicuous and make the image difficult to see. It is clear that it will be regenerated. It goes without saying that, especially when used as a high-resolution graphic display terminal for computer aided design (CAD), it is a fatal flaw that one display screen has a joint.

[Purpose of the invention]

The object of the present invention has been made in view of the above-mentioned conventional problems, and is to provide a color picture tube that is large in size, has high brightness, high resolution, and is easy to use.

[Summary of the invention]

In the present invention, a plurality of small beam index type color picture tubes are appropriately arranged and integrated into an integrated structure, the phosphors of the video screen are continuously formed, and each subdivided screen can be easily and continuously divided at the boundaries of each subdivided screen. A plurality of types of index stripe phosphors are formed so as to be scannable, thereby achieving the object described in item 1.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view of a color picture tube embodying the present invention, FIG. 2 is a cross-sectional view taken along the line X--X in FIG. 1, and FIG. 3 is a cross-sectional view taken along the Y--Y line in FIG. In FIGS. 1, 2, and 3, an index type color picture tube (1) has a face plate (2) having a screen portion (3) and a number of necks (5) connected through funnels of the face plate (2). -1), ..., (5-1s:) and l'11f A large number of small electron gun sections (6-1) housed inside each neck,
..., (6-12) and funnel 0 from each neck
) A large number of deflection yokes (7-
1),... (7-12) and the transparent light-receiving window (8) provided in the funnel 0) and the photoelectric conversion device placed outside the light-receiving window (8)! i! ? (9).

FIG. 4 is an enlarged view of the face plate (■ and screen section ■) in FIG. 1. Here, the dashed dotted line at the center of FIG. The scanning direction is from left to right in FIG.

The screen portion (■) formed on the inner surface of the face brake (l-■) has a large number of phosphors (1o) including three phosphor stripes R, G, and B as one group, and the above phosphor stripe (1o).
0) A black stripe (11) formed to fill the gap between them, an aluminum metal back (12) formed by vapor deposition or the like to surround both stripes, and a constant position corresponding to the position of the black stripe (11). index stripes (13) formed at a pitch of .

The index stripes (13) are formed at a different pitch from other screen parts near the end of the divided scanning of each divided area by each small electron gun section.

In this embodiment, the size of the entire effective screen area is 4
06.4mm, height 304mm, 8mm, diagonal 508mm.
0mm, so-called 20-inch effective screen is divided into 4 parts in the width direction and 3 parts in the height direction, and the size of each divided area is a square with a width and height of 101.6 mm.
．． This corresponds to the size of the effective screen area of a Finch color picture tube.

In addition, in Fig. 4, the pitch (Ps) of each phosphor stripe (1o) is 0.675 mm, and the phosphor stripe (1o) is 0.675 mm.
The width (Ts) of the live (10) is 0.155 mm, blank 1-live (11) and index stripe (
The width (Tn) of index stripe (13) is 0.07 mm, the pitch (PA) of index stripe (13) is 0.45 mm,
The pitch (Pp) of index stripes (13) near the end of divided scanning of each divided area is 0.22511If
The pitch is l+, which is 1/2 the pitch (PA) of other screen parts.

Figure 5 shows the operating principle of this embodiment.
The operating principle will be explained in detail according to the figures.

Conventional 1′? In the color picture tube of the 8-gun system, the position (S
1) to position IFi (S5) is horizontally scanned by a single deflection system with at least one electron beam emitted from a single sub-gun section. On the other hand, in the embodiment of the present invention,
Divide the position (S5) from position (St) into four, and divide the divided area (
υ, This horizontal scanning is repeated multiple times to reproduce the entire image.

As is clear from FIG. 4, the most important aspect of the present invention is the joining of images of each divided area.

In a conventional index-type color picture tube, the position of each color phosphor can be determined based on the information obtained from the index signal, and the video signal can be switched. It was sufficient to synchronize with the vertical synchronization signal, and the quality of one image, such as continuity and color reproducibility, was hardly affected by changes in the shape of the deflection area.

However, in the method of this embodiment, it is necessary to control the size and shape of the deflection region with extremely high precision, including the aging of the deflection yoke and the deflection circuit color picture tube itself.

For the reason mentioned above, in this method, each division side boundary section 'J-
(1B), (2B), (311), (4B), other screen parts (IA), (2A) are used to emit light signals of a different pattern from the light signals from the normal index stripe phosphor. , (3A), and (4A), the index stripes are formed at a different pitch.

In this method, in the divided area α), the electron beam source (G1
) is deflected to start deflection scanning from position (S1), and one section (IA) is scanned in the same way as a normal beam index picture tube. When the electron beam enters section (IB), an index signal of a different pattern from section (IA) enters, so in this embodiment, when the different pattern starts, the electron beam source of divided area (■) is activated by the fourth index signal pulse. (G2) and its deflection system to alternate scanning and continue the next scanning. Scanning of the following areas is also performed using the same procedure. Here, as a procedure unique to the one-bokuto method, it is necessary to match the time required for scanning each divided area with the reproduction time of the image sent during scanning of that area.

In a conventional index-type picture tube, this corresponds to the control of the deflection area that is deflected over a certain period of time, that is, the raster size when reproducing one image. In the conventional index method, in order to determine the point at which to start scanning, an index stripe is formed outside the effective area of the video screen with a pitch different from that of the screen area, and the scanning start position is determined by forming an index stripe on the outside of the effective area of the video screen.
Although it is proposed in Japanese Patent No. 8974, etc., it does not control the end of the horizontal scan (normally the left end of the raster), and in actual operation, it does not control the end of the horizontal scan (usually the left end of the raster). NTSC signal (or PAL signal, etc.)
By synchronizing the horizontal synchronization signal and horizontal deflection signal, the entire image can be reproduced without any problems. Air horizontal deflection completed. point(
You only need to adjust the size (total size) once at the beginning. Even if there is a shift in the horizontal deflection end point (or the overall raster size) due to aging, etc., as long as there is no synchronization shift in the various signal systems mentioned above, the overall quality of the reproduced image will hardly deteriorate. .

However, in the divided beam index method of this embodiment, the size of the entire reproduced image and the size of the sub-divided images are set in advance with high precision, so the time required for deflection scanning of each car division and the size of each sub-divided image are The time required to draw the video signals must match with high precision. In other words, this means that the deflection scanning must be performed by an amount equal to the size of each subdivision in the horizontal direction, coinciding with the time when the video signal of each subdivision is sent.

If the above-mentioned control is not applied to the color picture tube of this system, overlapping of the divisions, generation of gaps, etc. will occur at the joints on the sub-division side, and the quality of the overall image will be significantly degraded.

Therefore, in addition to the conventional method of detecting the position of each color stripe, the index stripe phosphor of this method has a function of detecting the position of the electron beam at a plurality of points during deflection scanning.

Here, a description will be given of control when there is a difference between the time when the video signal of the sub-divided portion is sent and the end time of the deflection scan in the horizontal direction of the sub-divided portion.

In the method of this embodiment, the horizontal-scanning video signal is temporally accurately divided into four, and the time is divided into four areas ω as shown in FIG.
), then from time 1=0 to 1=1. Until then, the electron beam source (G1
) is applied with a video signal regardless of deflection scanning.

From time 1=11 to time 1=11+12, electronic bee 1
A video signal is applied to one source (G2) regardless of deflection scanning. Similarly, video signals are sequentially applied to each electron source. Also, the time required for horizontal-deflection scanning for each effective image part of each divided area (1) to 0) in FIG. 5 is tdl etd2.
td3. Let it be td4. The condition for the entire video to be completely connected is ji = tdg s k = jd + t3”
jd, + j4 = td4.

Here, if a time lag corresponding to t, > td□ (or t1 = td, +Δ1) occurs, the index of the pitch formed on the screen portion (IB) earlier than when normal operation is performed in area 0) An optical signal from the drive is detected.

If this deviation from normal operation is fed back to the signal amplitude setting circuit of the deflection yoke drive system, the deviation can be corrected.

In addition, the raster size of each divided area is determined as described above.As with the conventional beam index method, an index stripe is formed outside the effective area of the video screen with a pitch different from that of the screen area, and the scanning start position is determined. All you have to do is decide. Also area ■.

The scanning start point of (1), 0) can be determined by overscanning each area in advance before actually scanning the areas (2), (2), 0). In other words, in the case of area ■, overscanning position ■ stimulates index stripes of different pitches formed in the suffragette (IB).
The position (S2) can be determined based on the timing at which the optical signal is output. Hereinafter, the positions (S3) and (S4) can be determined in the same manner for the areas (2) and 6).

By the above procedure, the deflection signal of the sub-division area can be completely corrected, and the time jx = idx + jz =
idz +t, = td:l #t4=td4
satisfies the following conditions and can reproduce a high-quality overall image.

Next, the vertical joining of each dividing plane will be explained.

FIG. 6 is a diagram showing the formation pattern of index stripes near the dividing side boundary. Aluminum metal back (
12) is formed corresponding to the black stripe (11).

The area shown in Figure 5 of the index stripe (13) (
Since the widths of IB), (2B), (3B), and (4B) are different in vertically adjacent divided areas, the index stripes (
13), the patterns of the optical signals become different.

Therefore, the thickness and position of the raster in the vertical direction can be easily corrected using the same procedure as the size and position of the raster in the horizontal direction.

The above-described correction of the deflection signal may be performed continuously during the actual drawing operation, or may be performed at certain regular time intervals.

In this embodiment, the index stripe phosphors shown in FIG. 4 are formed at completely different pitches near the subdivision boundary and in other parts, but there is no particular problem if the pitches of both are continuously varied. There isn't.

Alternatively, index stripes of two or more different pitches may be formed in the entire video screen section so that correction of the deflection signal can be performed simultaneously at a plurality of locations.

Alternatively, instead of detecting the position based on the difference in the pitch of the index stripes, the pitch may be the same in all screen sections, and the phosphor material of the index stripes may be changed to change the emission wavelength or emission intensity of the index stripes that partially emit light. .

Furthermore, by using a plurality of photoelectric conversion devices, it is possible to improve the light receiving sensitivity and simultaneously correct multiple divided regions.

This embodiment has described the case where real-time operation is performed for signals such as NTSC, but - Image information for a screen or one line is stored in a frame memory or line memory, and multiple divided planes are drawn and scanned at the same time. It can also be easily realized.

Further, in this embodiment, the plurality of small electron guns are arranged substantially perpendicular to the screen part, but the small electron guns may be tilted in order to shorten the overall length of the picture tube.

〔Effect of the invention〕

As described above, according to the present invention, the dividing boundary part, which has been considered a disadvantage in conventional split display color picture tubes, is made into an integrated screen part, making it possible to reproduce images that are easy to use. , adopts the beam index method,
The image brightness is extremely high compared to the same type of color picture tube,
Furthermore, although the index type color picture tube of the present invention has a large screen, a plurality of small index color picture tubes are arranged in an array, so the depth can be shortened, and therefore the electron optical magnification of the electron gun can be increased. It is smaller and can reproduce high-resolution, high-quality images. Furthermore, by creating a difference between the index stripes near the subdivision boundaries of each subdivision screen and the index stripes in other screen parts, it is possible to join and correct the subdivision images.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the index type color picture tube of the present invention, and FIGS. 2 and 3 are x of FIG. 1.
- Schematic cross-sectional view along x' and y-y'. No. 4 US4 is a schematic partial enlarged view showing the face plate and screen portion of FIG. 1, FIG. 5 is a schematic view for explaining the operating principle of the embodiment shown in FIG. 1, and FIG. FIG. 3 is a schematic diagram showing index stripes. (1) Index type color picture tube ■ Screen section ■ Face plate (A) Funnel ■ Neck section ■ Small electron gun section Y' Fig. 1 2 Mouse Figure 3 1 @ Figure 4 m5 Figure

Claims (1)

[Scope of Claims] 1) A screen section having a striped phosphor and an index signal generating phosphor; an electron gun section that emits an electron beam that impacts the screen section; a deflection section that deflects and scans the electron beam; In an index color picture tube equipped with a photoelectric conversion device that receives an index signal from a phosphor for generating an index signal, the electron gun section and the deflection section are arranged separately into a plurality of small electron gun sections and a plurality of small deflection sections. , the screen section is divided and scanned into a plurality of small regions by each electron beam in the small electron gun section and the small deflection section, and the index signal from the center of the small region and at least a part near the boundary of the small region are scanned. An index-type color picture tube characterized by distinguishing index signals from. 2) In the indexing type color picture tube according to claim 1, the index signal generating phosphor is arranged in a screen portion divided into a plurality of small regions by the plurality of small electron gun portions and small deflection portions. An index type color picture tube characterized in that at least part of the vicinity of the boundary of the divided small areas is formed in a continuous or discontinuous pattern different from the area other than the boundary. 3) In the indexing type color picture tube according to claim 1, the index signal generating phosphor is arranged in a screen portion divided into a plurality of small regions by the plurality of small electron gun portions and small deflection portions. An index type color picture tube, characterized in that a phosphor having a different wavelength or a different emission intensity than areas other than the areas other than the boundaries is formed in at least a part of the vicinity of the boundaries of the divided small areas.