JPH02201849A - Cathode-ray tube and large picture plane display device - Google Patents

Abstract

PURPOSE:To increase tube strength, withstand voltage, and angle of visibility of the picture plane by providing a step part at the peripheral part of a plane panel having fluorescent screen at the inner surface and causing a funnel to abut this step part. CONSTITUTION:A step part 10 is provided at the inner surface peripheral part of a plane panel 2, and a funnel 3 is caused to abut this step part 10, and a tube body 1 is formed by joining them via frit-glass 12. In this way, mechanical strength of the frit joined part is made large, and creeping distance at the frit joined part is made long so that sufficient withstand voltage can be obtained. Therefore, thickness t3 of the picture plane side wall part of the funnel 3 can be made so thinner that it can be made not larger than 1/2 of the conventional thickness. Further, because the funnel part is joined at the step part 10 of the panel, angle of visibility theta1 can be made larger as compared to the tube body wherein the funnel 3 and the side surface of the panel 2 is so joined that, for example, strength and withstand voltage are increased. Namely, loss of the angle of visibility due to the thickness t3 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube and a large screen display device using the cathode ray tube.

[Summary of the invention]

In a cathode ray tube, the present invention provides a stepped portion at the peripheral edge of a flat panel having a fluorescent surface on the inner surface, and a funnel is abutted against this stepped portion, thereby increasing the strength and withstand voltage of the tube body, and increasing the screen. This allows the viewing angle to be expanded.

According to the present invention, in the cathode ray tube described above, the panel abutting portion of the funnel is made thinner than other portions, thereby making it possible to reduce the thickness of the screen side wall portion of the tube body.

The present invention provides a large screen display device in which the cathode ray tubes described above are arranged in a matrix. By arranging it further outward, the seams are less noticeable and a large screen with high quality and a wide viewing angle can be obtained.

[Conventional technology]

Conventionally, large-screen display devices have been known, for example, as shown in FIG. 13, those constructed by arranging existing cathode ray tubes (41) in a matrix, or those constructed by similarly arranging liquid crystal display elements in a matrix. There is.

In addition, as shown in FIG. 14, three primary colors of green, red, and blue, which serve as picture elements, are placed inside the glass tube (33) consisting of a front panel (31), a back panel (not shown), and a side plate (32). An 8-element display device has been proposed in which there are a plurality of so-called phosphor trios (34) consisting of phosphor layers (G), (R), and (B), for example, 8 sets as shown in the figure (Japanese Patent Application Laid-Open No. 60-1
91703). The display elements (35) are two-dimensionally arranged to constitute a large screen display device as shown in the figure. This display device can reproduce clear images with sufficient brightness even outdoors.

[Problem to be solved by the invention]

However, large screen display devices using conventional display elements,
For example, in the large screen display device shown in FIG. 13 in which cathode ray tubes (41) are arranged, the seams between the cathode ray tubes (41) become checkered stripes (42), which significantly degrades the quality of the screen. That is, as shown in Fig. 15, the inner surface has a fluorescent surface (4
In the case of a cathode ray tube (41) composed of a tube body consisting of a normal non-flat panel (44) formed with , an appropriate thickness tl is required from the viewpoint of withstand voltage. For example, for a 4-inch cathode ray tube, the wall thickness is 2.5 mm.
The maximum thickness that could be achieved was ~3 mm. For this reason, there are many ineffective areas between adjacent cathode ray tubes (41) and (41) (however, (E) is an effective area) and (checkered stripes).
42), and the screen quality was degraded.

On the other hand, the 16th model was used as a viewfinder for video cameras.
As shown in the figure, a flat panel (51
) and a funnel (52) are used to form a tube body (53).

(55) is a fluorescent surface, and (56) is an electron gun. Usually 0
．． In a view finder like a finch, the high voltage is 5 kV or less, for example, about 2 kV, so the thickness t2 of the funnel (52) of the tube body is 1 m in terms of strength and withstand voltage.
About m is sufficient. However, if this structure is used in a larger size, such as 4 inches, both the strength and withstand voltage will increase, making it impossible to use a funnel as thin as 1 mm.

In addition, in the case of the large screen display device shown in FIG. 14, the pitch of the phosphor trios (34) is made equal even between adjacent display elements (35), so that the seams between the display elements (35) are not noticeable. However, the strength of the glass tube body33)
An appropriate thickness is required from the viewpoint of withstand voltage, and there is a limit to increasing the resolution by making the pitch of the phosphor trio (34) smaller.

In view of the above-mentioned points, the present invention provides a cathode ray tube in which sufficient mechanical strength and withstand voltage can be obtained even if the thickness of the screen side wall portion of the funnel is reduced.

Further, the present invention provides a large screen display device that uses such a cathode ray tube to obtain a high quality screen and has a wide viewing angle.

[Means to solve the problem]

The cathode ray tube of the present invention has a stage I! (10) is provided, and the funnel (3) is butted against this stepped portion (10), and the pipe body (1) is
form and compose.

Further, in the cathode ray tube of the present invention, in such a tube body (1), the wall thickness t3 of the panel abutting portion of the funnel (3) is
is made thinner than the wall thickness t4 of the other part of the funnel (3).

A large screen display device of the present invention, that is, a large screen display device in which a plurality of cathode ray tubes (8) are mounted on a multi-IJ hook, is a flat screen display device having a fluorescent surface (5) on the inner surface as a cathode ray tube (8). The funnel (3) is butted against the step (10) provided on the peripheral edge of the panel (2), and the step (10) is connected to the phosphor adjacent to the step and the end of the flat panel (2). Connecting line (n)
It uses a cathode ray tube configured so that it is located outside the area.

[Effect]

According to the cathode ray tube (8) of the present invention, a stepped portion (10) is provided at the peripheral edge of the flat panel (2), and the funnel (3) is butted against this stepped portion (10) to constitute the tube body. So,
Even when the thickness of the funnel (3) is made thinner, the mechanical strength of the frit joint between the panel and the funnel is strong.
In addition, the creepage distance at the frit joint is increased, and the withstand voltage is also improved. Furthermore, there is no loss in viewing angle due to the thickness of the funnel, and the viewing angle is widened.

Also, the wall thickness t of the panel butt part of the funnel (3)
By making 3 thinner than the other parts of the funnel (3), the thickness t of the screen side wall part of the funnel (3) can be made thinner, and when such a cathode ray tube is applied to a large screen display device, high resolution can be achieved. becomes possible. .

Further, according to the large screen display device (11) of the present invention, the cathode ray tube (8) is connected to the stepped portion (
10) and funnel (3), and step part (10)
The thickness of the funnel (3) is can be made thinner, making the seams between adjacent cathode ray tubes less noticeable. In addition, the resolution of the screen is increased, and the viewing angle is wider than that of the conventional screen1, allowing the function of a large screen to be fully demonstrated.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 to 11.

FIG. 1 is a side sectional view of a cathode ray tube according to this embodiment (that is, a cathode ray tube applicable as a display element for a large screen), FIG. 2 is a front view thereof, and FIG. 3 is a sectional view of its main parts. be.

In the figure, (1) indicates a tube body, which is formed from a flat panel (2) made of glass and a funnel (3) with an integral neck portion. The flat panel (2) has a strip-shaped fluorescent display section on its inner surface, which is a plurality of sets of picture elements, that is, N in this embodiment.
A phosphor surface (5) is formed of a total of 64 so-called phosphor trios (4), 8 It pairs×8 vertical pairs. As shown in FIG. 2, this phosphor trio (4) includes a blue-emitting, red-emitting, and green-emitting phosphor layer (B) having a length and a width W;
R) and (G), with a predetermined pitch P and whose longitudinal direction is horizontal to the display surface (9), that is,
arranged along the direction. Fluorescent layer (B), (R)
, A light absorption layer is formed on the surfaces other than (G).

The flat panel (2) and the funnel (3) are joined together using frit glass (12). In this example, the third
As shown in the figure, a flat panel made of flat glass (2)
A step (10) is provided on the inner peripheral edge of the step (10).
The ends of the funnel (3) are butted against each other.

On the funnel (3) side, the adjacent area to be joined to the flat panel (2), that is, the outer circumferential surface (3a) of the screen side wall part, is flush with the side surface (2a) of the panel. It is formed perpendicular to the surface.

Further, the inner surface (3b) of the screen side wall portion is formed in a tapered shape so that the thickness of the funnel (3) gradually decreases toward the joint end. On the other hand, the side wall (10a) of the stepped portion (10) of the panel (2) is tapered to correspond to the tapered inner surface (3b) of the funnel (3).

The step (10) has a phosphor or phosphor surface (5) adjacent to the step.
) is formed so as to be located outward from a line (n) connecting the phosphor located at the sidemost end of the flat panel (2) and the end of the flat panel (2).

The phosphor trio (4) may be formed by either a printing method or a slurry method.

Further, as the electron gun (6), an electron gun that emits a single electron beam (e) is used. The electron beam is applied to each blue phosphor layer (B), red phosphor layer (R) and green phosphor layer (G) of one phosphor trio (4) by three switching operations.
The beam is scanned vertically and horizontally by the deflection yoke (7) as if hitting. The beam shape is preferably a horizontally elongated beam shape (for example, an ellipse) so as to correspond to the shape of the phosphor layer.

In this example, since the phosphor trio (4) is arranged with its longitudinal direction along the X direction, the phosphor layer (4) is scanned using the conventional scanning method, that is, while scanning horizontally (X direction). B)
, (R), (G), but instead of hitting the phosphor layer (B), (
I try to hit R) and (G).

The specific operation and means will be described later.

The cathode ray tube (8) having such a configuration is shown in FIGS. 4 and 5.
As shown in the figure, by arranging a large number of cathode ray tubes (8) two-dimensionally, it is possible to configure a large screen display device (11) with an interval of d (see FIG. 6) between adjacent cathode ray tubes (8). .

In this embodiment, a large screen display device (11) is constructed by arranging a total of 1200 cathode ray tubes (8), 30 in the vertical direction and 40 in the horizontal direction.

Next, an example of the operation of the large screen display device (11) and a circuit system for realizing the operation will be explained based on FIGS. 7 to 11.

First, the TV signal (Si) received by the antenna <61)
is demodulated as a composite video signal (Sl) by a tuner (62) and a video detector (63). This video signal (Sl) is a brightness/chroma processing circuit (Y/C processing circuit)
(64) and are converted into primary color signals B, R, , G, and then supplied to the subsequent image processing circuit (65).

Note that the antenna (61), china (62), video detector (63), and Y/C processing circuit (64) are general-purpose circuits for general television reception, and do not have any special features. Since there is no such thing, detailed explanation will be omitted.

Now, the composite video signal (S
1) is also supplied to a synchronization separation circuit (66), where it is separated into a horizontal synchronization signal (H) and a vertical synchronization signal (V).

The image processing circuit (65) includes a field memory circuit (67).
), and a Y/C processing circuit (64
) and store the primary color signals B, R, and G in each field. That is, this image processing circuit (65
), as shown in FIG. 8, there are writing fields for the primary color signals B, R, and G, respectively. J
(We), (WR), (WG) and reading Nofield memories (RB), (RR), (RG) are provided, for a total of six field memories.

Further, the large screen display device (11) according to this embodiment uses a total of 1200 cathode ray tubes (8), 30 in the vertical direction and 40 in the horizontal direction, and furthermore, each 1-ji cathode ray tube (8) is used. ) is 8
×8 = 64 phosphor trios (4) are provided, so at least 64X for one field memory
1200 = 76800 pieces of information need to be stored in memory. For this purpose, a synchronous separation circuit (6
The horizontal and vertical synchronizing signals (H) and (V) from 6) are supplied to a timing control circuit (68), and supplied as a sampling signal (f SP) to an image processing circuit (65). That is, the timing control circuit (68)
Various timing signals are obtained from the sampling signal (fsp), and the primary color signals B, R, and G are sampled by the sampling signal (fsp), and another timing signal, that is, a write address signal, is sent from the timing control circuit (68). Field memo for writing by controlling with (WAX) and (WAy) (WB),
(WR).

(!IIG) so that the primary color signals B, R, and G are written in the correct order. In this case, the sampling signal (f sp)
The frequency may be selected to be a frequency that corresponds to 76,800 samplings, but since the image field memory for boat fishing has a sampling frequency of 76,800 or more, the image field memory can be used as is, It is practical to control the read address to obtain the necessary information.

Write field memory (WB>,
The signals written in line order to (WR) and (WG) are stored in small memos for driving each cathode ray tube during the next field scanning period, for example, the vertical blanking period. I
(M+), (M2),...be)J□. . ) will be forwarded to.

Therefore, a transfer control signal (Te3) is supplied from the timing control circuit (68). This control signal (Te
3) is represented by a single line in the illustrated example, but in reality, it is the write field memory (19B), (WR)
, (IIG), small memo IJ for driving each cathode ray tube (8) (M,), (M2)
, ... (!, 1.□..) address signal for writing, field memory circuit (67) and small memory (!
Selector circuits (SB), (SR), (SG) provided between Jl), (!, +2), ... (Ml□..)
It is composed of control signal lines etc. that operate the.

Also, in one small memory, as in the field memory circuit (67), there are a total of 6 dedicated memories for writing and 6 dedicated memories for reading each of the primary color signals B, R, and G.
Dedicated memory is provided. This dedicated memory can store at least 64 pieces of information because 8× 8 =64 phosphor trios (4) are provided in the cathode ray tube (8).

For convenience of explanation, the field memory circuit (67) has read field memo 'J (RB), (RR
).

(RG) and write field memory (We), (l
νR).

However, in this embodiment, as shown in FIG. 9, for one primary color signal, for example, the blue signal (B), two read/write field memories (FB,
, (FB,), switch (St +),
Field memo IJ (FB,) by switching (S2 +).

(FB2) is cyclically selected for reading or writing. For example, when writing the data of the first field to the field memo U (FB,), move the switches (St +) and (S21> to the (a) and (d) sides, respectively. At this time, the other field memo The data of the previous field is stored in the small memory C:, +1), (+a□) from IJ (FB2).
,...(Mlzoo) may be read out on the side. The next second field data is the switch (S
Turn Z) to R) side and write in the other field memo 'J (FB2), which is now empty.
Switch the data of the 1st field (So+) to (
C) Small memo 'J (L), (
M□), ... (M,□.0) side. This operation is similar to other field memories (FRI), (F
B2), (FGI), and (FG2) are also switched in the same way (S1□) and (S22), respectively.

Reading and writing are selected by (St3) and (323).

Then, by repeating these operations, the sequentially sent primary color signals (B), (R), and (G) are stored in a small memory (
L), (M2), ``'' (M12oo) side.

This example includes switches (Sl+), (SI2), (S
+3), (S21).

(S2□) and (S23) were moved at the same time to perform writing and reading at the same time, but the vertical blanking period of the input scan was used to switch (") during that period.
z), (s+□), (S+3) and switch (
S21), (S22).

(S23) may be moved in different phases to read from one field memory first, and then write to the other field memory.

In addition, small memory (M,), (!J2), ... (
M12°. ) as well as the above field memory circuit (6
7), there are two dedicated memories for reading and writing (λIL), (:, +R,) for each primary color signal.
, (', 1R2), (λIG,), (uez), and switches (S31), (S32),
(S33) and switch (S41), (S42)
, (S43), respectively read and write can be selected.

The field memo is read out by turning the switch (S21) of the field memory circuit (67) to the (C) side, for example! J (FBI>
, (PR,).

Image signal (B) stored in (FG,), (
During the next field period (including the vertical blanking period), R) and (G) are connected to the small memory (M,), (!J2).

... (L2oo), each dedicated memory for example (
1, IB, ) (', IR1), (!, IGl). At this time, field memory (PL), (F
It goes without saying that the information of RY) and (FGI) is divided and transferred. That is, each dedicated memory (MBI
), (MRI), and (MGI> are each controlled to store 64 pieces of information in memory.

The image signals transferred to each dedicated memory are read out as follows. That is, read address signals (RAx) and (RAy) are sent from the timing control circuit (68).
A small memo for each! Each dedicated memory (+, +a,), (MR,), (MCI) in J (Ml) ~ (M12゜0)
is supplied to At this time, in this example, the address signal (
RAX) and (RAy) are controlled so that the reading order is in the vertical direction of the screen.

As a result, each field memory (FB, ), (FRI
), (FGI) and each dedicated memory (+ae, ), (
! , IR, ), (MCI) The image signals stored line-sequentially and in the horizontal direction are read out in the vertical direction (vertical direction) as shown in FIG. 11A when looking at the entire image. It turns out.

Each dedicated memory (1, 1B,), (iJR,), (y
The signal read out as described above from Ae+) is
Next, it is converted into a serial signal by a switching signal (fsw) supplied from a timing control circuit (68). That is, at the position of the front wall light layer, the B memory switch (s
b) and turn on each B-dedicated memory (λ1B,)
Or output a signal from (MG2), turn on the R memory switch (Sr) at the position of the red phosphor layer, and output a signal from each R-dedicated memo +3 (MR,) or <MP,,). , At the position of the green phosphor layer, turn on the G memory switch (Sg) and write each G-dedicated memo IJ (
By outputting a signal from MG, ) or (MG2), a serially converted BRG signal is obtained. These 1200 serial signals are then supplied to each of the cathode ray tubes (8,) to (8,2°) via amplifiers (AMP+) to (AMP+2ao) to display images.

In Fig. 7, the switching signal (f sw) is shown as one control line, but in reality, as shown in Fig. 8,
Three control lines (f sw+), (f 5112),
(f 5l13>), and these three control lines (f
sw+), (f S'l12>.

(f5w3) is configured to supply phase-shifted switching signals as shown in FIG. 10.

Furthermore, the deflection is also changed in response to changing the reading direction to the vertical direction as described above.

That is, as shown in FIG. 11B, the vertical synchronization signal (17 msec: 60 Hz) obtained from the synchronization separation circuit (66) (
horizontal deflection (H) of each cathode ray tube (8) based on
CM) is performed at the same time, and the timing control circuit (
The vertical deflection (Vex) of each cathode ray tube (8) is simultaneously performed using the vertical deflection signal (Sv> obtained from 68).

Since each cathode ray tube (8) has eight lines in the vertical direction, this vertical deflection signal (Sv) is The frequency is X60=480Hz (2m 5ec).

In the above example, only 1,200 cathode ray tubes are used because it is mainly for indoor use, so even if the input is an interlaced scanning signal, the odd and even fields hit the same location. This is because if a large screen display device is configured with a small number of 1200 cathode ray tubes, the number of lines in the vertical direction can only be 8×30=240 (the number of input scanning lines is as high as 520). Therefore, it is obvious that the number of cathode ray tubes used may be doubled to perform interlaced scanning. In this example, odd fields,
Either of the even fields may be discarded.

Also, in the above example, the field memory and dedicated memory are
, R, and G, but for example, if transfer is to be performed within the vertical blanking period, it is sufficient to write to one field memory and one dedicated memory each, and switch instantly by reading. Therefore, the number of memories can be halved.

According to the above-mentioned cathode ray tube, a step (10) is provided on the inner peripheral edge of the flat panel (2), and the funnel (3) is butted against this step (10) and joined via the frit glass (12). Since the pipe body (1) is formed by using the pipe body (1), the mechanical strength of the frit joint is large, and the creepage distance at the frit joint is also long, so that sufficient voltage resistance can be obtained.Therefore, the screen of the funnel (3) The thickness t3 of the side wall portion is made thinner, that is, the fifth
It becomes possible to reduce the thickness to 1/2 or less of the conventional thickness t shown in the figure. In addition, a funnel (
3), so for example, as shown in Figure 12, the funnel (3) and panel (
2) The viewing angle θ1 (θ1
〉θ2) expands. That is, with this configuration, the loss in viewing angle due to the thickness t3 of the funnel shown in FIG. 12 can be eliminated.

Furthermore, in this configuration, the phosphor layer located at the sidemost end of the phosphor surface (5) is located outward from the line n connecting the panel ends.
The viewing angle θ is wider.

Then, the cathode ray tube (8) arranges a strip-shaped phosphor trio (4) having a predetermined arrangement pitch P so that its elongated direction is the display surface (
9), so when a large screen display device (11) is constructed by arranging a large number of cathode ray tubes (8) in a matrix, adjacent cathode ray tubes (8) ), the phosphor trio (4) also has the above pitch P.
The seam portion has the same effect as the light absorption area of the fluorescent surface (5), and as a result, a high-quality image in which the seam portion is inconspicuous can be obtained. In addition, since the thickness t of the screen side wall of the funnel (3) of the cathode ray tube (8) can be reduced to 1/2 or less of the conventional thickness tl, the phosphor trio (4) The pitch P can be made small, and a large screen display device with higher resolution can be obtained. Moreover, the funnel (3) of each cathode ray tube (8)
Since the outer circumferential surface (3a) of the side wall of the screen is a flat surface, the cathode ray tubes (8) can be easily arranged in a matrix.

Also, when looking at the screen from the side, the endmost phosphor (34) of the phosphor trio (34) located at the side edge as shown in
There is no phenomenon in which G) or (B) become invisible (in this case, the field of view that can be seen as a good image is narrowed),
The viewing range in which a good image can be seen is wider than in the past.

Since the panel (2) is a flat panel, the fluorescent surface (5) can be created by printing, which can reduce costs. Furthermore, when a large screen display device is configured, the large screen appears integrated.

〔Effect of the invention〕

In the cathode ray tube according to the present invention, a stepped portion is provided at the peripheral edge of the flat panel, and the tube body is formed by butting the funnel against the stepped portion, so that the mechanical strength and withstand voltage at the panel-funnel joint are improved. Therefore, the thickness of the area adjacent to the funnel panel, that is, the side wall of the screen, can be made thinner. Also, the viewing angle can be widened.

Furthermore, by making the wall thickness of the panel abutment part of the funnel thinner than the other part of the fankil, the thickness of the screen side wall part of the funnel can be made thinner, and when such a cathode ray tube is applied to a large screen display device, The light surface can be formed closer to the edge of the panel, resulting in a larger screen with higher resolution.

Furthermore, according to the large screen display device of the present invention using such a cathode ray tube, it is possible to obtain high-quality images with inconspicuous seams, and it is also possible to widen the viewing angle, thereby enhancing the function of a large screen. be able to fully demonstrate their abilities.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a cathode ray tube according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional view of the main parts thereof, and FIG. 4 is a configuration diagram of a large screen display device according to the present invention. Figure 5 is its front view;
FIG. 6 is an enlarged view of the main parts of the large screen display device, FIG. 7 is a block diagram showing an example of operating means of the large screen display device, FIG. 8 is a block diagram showing the operation of the image processing circuit, and FIG. 9 is a block diagram showing the configuration of field memory and dedicated memory,
FIG. 10 is a timing chart of switching signals, FIG. 11 is an explanatory diagram showing the scanning order and horizontal and vertical deflection waveforms, FIG. 12 is a sectional view of the main parts used to explain the present invention,
Figure 3 is a front view showing a large screen display device according to a conventional example;
FIG. 4 is a front view of the main parts of a large screen display device according to another conventional example, FIG. 15 is a side sectional view of the main parts of the large screen display device according to the conventional example, and FIG. FIG. 2 is a side sectional view of a cathode ray tube. (1) is a tube body, (2) is a flat panel, (3) is a funnel, (4) is a phosphor trio, (5) is a phosphor surface, (10>
(12) is a frit glass. Deputy Hitomatsu Hide Morihachi B Field memory and special meso stone (7゛ mouth 1 showing group 11S. Rimata Figure 9)

Claims (1)

[Scope of Claims] 1. A cathode ray tube characterized in that a step is provided at the peripheral edge of a flat panel having a fluorescent surface on the inner surface, and a funnel abuts against the step. 2. A stepped portion is provided at the peripheral edge of a flat panel having a fluorescent surface on the inner surface, and a funnel is butted against the stepped portion, and the wall thickness of the panel abutting portion of the funnel is thinner than the other portion of the funnel. Characteristic cathode ray tube. 3. In a large screen display device in which a plurality of cathode ray tubes are arranged in a matrix, the cathode ray tube is formed by a funnel abutting against a stepped portion provided at the periphery of a flat panel having a fluorescent surface on the inner surface, and the stepped portion is , a large screen display device characterized in that the phosphor surface is located outward from a line connecting the phosphor adjacent to the stepped portion of the phosphor surface and the end of the flat panel.