JPH02211495A - Large-screen display device - Google Patents

Abstract

PURPOSE:To widen the angle of observable field by arranging a light transmissive material whose refractive index is close to that of the panels of cathode-ray tube bodies between adjacent tubes of the large-screen display device constituted by arranging cathode-ray tubes in a matrix. CONSTITUTION:The light transmissive material 13 whose refractive index is close to that of the panel 2 is arranged between adjacent cathode-ray tubes 8 of the large-screen display device. Consequently, even if the angle between the outermost end picture element and panel front surface end part decreases, light l1 which passes through the panel flank among lights emitted by picture elements is projected from the same surface as the panel front surface as well as light l2 passing through the panel front surface end part and the disorder of an image at a part nearby the panel end is eliminated to increase the angle of field where an image of good quality is seen. Instead of arranging the material 13, the peripheral flank of the panel is formed into a light absorbing surface 14 or light scattering surface 15 to cut off or scatter the unnecessary light l1, thereby increasing the angle of field as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large screen display device having cathode ray tubes arranged in a matrix.

[Summary of the invention]

The present invention provides a large screen display device in which cathode ray tubes are arranged in a matrix. This is to widen the possible viewing angle.

The present invention also provides a large screen display device in which cathode ray tubes are arranged in a matrix, in which unnecessary light is reduced or blocked for viewing by making the side end surfaces of the cathode ray tubes light scattering surfaces or light absorption surfaces. This is to widen the possible viewing angle.

[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). Fluorescent J! An 8-element display device having a plurality of so-called phosphor trios (34) consisting of i (G), (R), and (B), for example, 8 sets as shown in the figure, has been proposed (Japanese Patent Application Laid-Open No. 1983-1999).
191703). The display elements (35) are two-dimensionally arranged to constitute a large screen display device as shown in the figure. This display device has sufficient brightness and can reproduce clear images even outdoors.

[Problem to be solved by the invention]

On the other hand, the present applicant has previously proposed a large screen display device, which is a phosphor using a plurality of strip-shaped phosphor trios of red, green, and blue phosphor layers arranged at a predetermined pitch on the inner surface of a panel of a tube body. We proposed a large-screen display device constructed by arranging a large number of cathode ray tubes in a matrix to form a surface and scan with a single electron beam.

FIG. 15 shows a cross section of the main part of such a large screen display device.

(8) is a cathode ray tube that becomes a display cell, and each cathode ray tube (
8) The funnel (3) is joined to the flat panel (2) through the flip (12) to form the pipe body (1), and the inner surface of the flat panel (2) is colored red, green, and blue. A phosphor screen (5) is formed by arranging a plurality of phosphor trios (4) of phosphor layers R, G, and B at a predetermined pitch P.

In this large screen display device, the phosphor trios (4) between adjacent cathode ray tubes (8) are also arranged at a pitch P, so that the seams are not noticeable.

By the way, in order to achieve high resolution by reducing the pitch P of the phosphor trio (4), the thickness of the screen side wall part of the tube body (1), that is, the funnel (3) is made thinner, and the outermost pixel, that is, the thickness of the funnel (3) is made thinner. Although the phosphor trio (4) must be brought closer to the edge of the panel (2), this configuration reduces the angle α between the outermost pixel and the front edge of the flat panel (2), making it difficult to view. A problem arises in that the visible viewing angle becomes narrow. That is, the light emitted from the outermost phosphor layer, for example, the blue phosphor layer B, includes light (12) that exits through the front edge of the panel and light (2I) that exits through the side surface of the panel. As a result, a distorted image (A
), which narrows the viewing angle at which a clear image can be seen.

In view of the above-mentioned points, the present invention provides a large screen display device that can provide a wide viewing angle even when the resolution is increased.

[Means to solve the problem]

The large screen display device of the present invention, that is, the large screen display device in which cathode ray tubes are arranged in a matrix, each adjacent cathode ray tube (8)
A translucent material (13) having a refractive index close to that of the tube panel (2) is arranged between the tubes.

Further, in the large screen display device in which the cathode ray tubes (8) of the present invention are arranged in a matrix, the side end surface of the cathode ray tube (8) is a light scattering surface (
15) or a light absorption surface (14).

[Function] According to the large screen display device of the present invention, a translucent material (13) having a refractive index close to that of the panel (2) is disposed between each adjacent cathode ray tube (8). Therefore, even if the angle α between the outermost pixel and the front edge of the panel becomes smaller, the light (11) that passes through the panel side of the light emitted from the outermost pixel is Similar to the light (12) that passes through the substance (13) and the front edge of the panel, it will be emitted from the same surface as the front of the panel. Therefore, image disturbance near the panel edge is avoided, and the viewing angle for viewing a clear image is widened.

In addition, by using the side end surface of the cathode ray tube (8), that is, the circumferential surface of the panel, as a light absorption surface (14) instead of the substance (13), so-called unnecessary light (
j! I) is blocked by this light absorption surface (14) and is no longer emitted, and the viewing angle is widened as in the above example.

Furthermore, by using the side end surface of the cathode ray tube (8), that is, the circumferential surface of the panel, as a light scattering surface (15) instead of the object 'It (13), unnecessary light passing through the panel side surface (15) can be used as shown in FIG.
f! , +) are scattered and reduced by the light scattering surface (15). Therefore, in this case as well, the viewing angle is widened as in the above example.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 to 12.

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), and FIG. 2 is a front view thereof.

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) is made of temporary glass, and on the inner surface of the panel there are strip-shaped fluorescent display sections that serve as a plurality of sets of picture elements, that is, in this embodiment, 8 sets horizontally x 8 sets vertically, totaling 64.
A phosphor surface (5) consisting of a so-called phosphor trio (4)
is formed. As shown in FIG. 2, this phosphor trio (4) has blue, red, and green phosphor layers (B) and (R) each having a length and a width of 7 W.

(G), and are arranged with a predetermined pinch P and with the longitudinal direction parallel to the display surface (9), that is, along the X direction. Phosphor layer (B), (R).

A light absorption layer is formed on the surface other than (G). The flat panel (2) and the funnel (3) are butted against each other via the frit (12) and are joined and integrated.

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 (C) of one phosphor trio (4) by three switching operations.
The beam is scanned vertically and horizontally by the deflection yoke (7) in a manner similar to hitting the beam. 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, the phosphor trio (4) has its longitudinal direction
Since the phosphor layers (B), (
Instead of hitting the phosphor layers (B), (R), and (G) while scanning vertically (in the Y direction), the specific operation is as follows: The means will be described later.

In this embodiment, the cathode ray tube (
A large number of cathode ray tubes (8) are arranged two-dimensionally as shown in FIGS. 3 to 5, and the panels ( A large screen display device (11) is constructed by embedding a transparent material such as a resin (13) having a refractive index and an expansion coefficient similar to those of 2). The resin (13) is embedded so as to be flush with the front surface of the flat panel (2). In this example, a cathode ray tube (
A large screen display device (11) is constructed by arranging a total of 1,200 pieces of 8), 30 pieces in the vertical direction and 40 pieces 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. 8 to 12.

First, the TV signal (Si) received by the antenna (61)
is demodulated as a composite video signal (S,) 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 after being made into primary color signals B, R, and G, they are supplied to the subsequent image processing circuit (65).

Note that the antenna (61), tuner (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 the sync separation circuit (66). It is separated into a horizontal synchronizing signal (H) and a vertical synchronizing 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. 9, there are field memories (WB) for writing in primary color signals B, R, and G, respectively.
(WR), (WG) and field memories (Rim), (RR), (RG) for reading 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 each cathode ray tube (8) has 8 cathode ray tubes (8). ×8=
64 phosphor trios (4) are prepared, so 1
At least 64x120 for one field memory
0 = 76800 pieces of information need to be stored in memory.

For this purpose, as shown in FIG.
The horizontal and vertical synchronizing signals (H) and (V) from
F) is supplied to the image processing circuit (65). That is, various timing signals are obtained from the timing control circuit (68), and the sampling signal (f
The primary color signals B, R, and G are sampled by SP) and are controlled by another timing signal sent from the timing control circuit (68), that is, write address signals (WAx) and (WAy). Field memory (WB), (WR).

(WG) so that the primary color signals B, R, and G are written in the correct order. In this case, the frequency of the sampling signal (f sp) may be selected to correspond to 76,800 samplings, but since the -a image field memory has a sampling frequency of 76,800 or more, It is practical to use the image field memory as it is and control the read address to obtain the necessary information.

Write field memory (WB) as above
, (WR), (WG) in line order are sent to the small memories (Ml), (Ml), (Ml), provided for driving each cathode ray tube during the next field scanning period, for example, the vertical blanking period. ...Transferred to (M, □..).

Therefore, a transfer control signal (Te3) is supplied from the timing control circuit (6th). This control signal (Te
3) is represented by one gland in the illustrated example, but in reality, it is a writing field memory (WB), (WR).
, address signal for reading (WG), small memory (1,0+z) for driving each cathode ray tube (8), etc.
Address signal for writing to (M, 2°.), field memory circuit (67) and small memory (Ml), (Ml)
,... (M, □..) The selector circuit (S
B), (SR), and (SG).

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).

Incidentally, for convenience of explanation, the field memory circuit (67) is a read field memory (RB), (RR).

(RG) and write field memory (WB), (
WR).

(-G), but in this embodiment, as shown in FIG. 10, two read/write field memories (FB,
), (FBt), switch (S++), (S
Field memory (F
BI).

(FB2) is cyclically selected for reading or writing. For example, when writing the data of the first field to the field memory (FBI), the switches (S11) and (521) are set to (a) and (
d) Turn it to the side. At this time, the data of the previous field may be read from the other field memory (FBI) to the small memories (L), (Mz), . . . (Mlz...). The data for the second field is
Move the switch (S++) to the (b) side to write to the other empty field memory (FB, ), and move the switch (S□) to (C) to write the data of the first field.
) by tilting it to the side (Ml), (?
h) ,... (Lx...) side.

This operation is similar to other field memories (FBI), (Fth
), (FG+), and (FGz), the switches (S+z) and (St□), respectively.

Reading and writing are selected by (S+z) and (SZ:l).

These operations are repeated and the sequentially sent primary color signals (B), (R), and (G) are stored in a small memory (Ml).
, (Mt), . . . read out to the (Ml2°.) side.

This example includes switches (Sz), (S+g), (S11
), (h+).

(hz), (SZ) were moved at the same time to perform writing and reading at the same time, but using the vertical blanking period of the input scan, the switch (S + +),
(S+□), (S+3) and switch (S!+), (S
2□) (szi) may be moved with different phases so that reading is first performed from one field memory, and then writing is performed to the other field memory.

In addition, small memory (Ml), (?h), ... (Ml
□. . ) as well as the above field memory circuit (67)
Similarly, there are two dedicated memories for reading and writing (MBI), (MBg), (MHI) for each primary color signal.
, (MRl), (MCI), (MG2), and switches (Ss+), (sz□), (S3:
l) and switch (S41), (S4□)l (S43
), reading and writing can be selected respectively.

Among the field memory circuits (67), the field memory (FBI), (FR
I).

The image signal (13) stored in (FG l ), (
During the next field period (including the vertical blanking period), R), (G) are connected to the small memories (n+), ( Mz).

. . . (Ml, ..) respectively dedicated memory, for example (MBI).

(MR,), (MG,). At this time,
It goes without saying that the information in the field memories (FB, ), (FRI), and (FGI) is divided and transferred according to the image area handled by each cathode ray tube (8). That is,
Each dedicated memory (MBI), (MRI), (MC
I) are each controlled to store 64 pieces of information.

The image signals transferred to each dedicated memory are read out as follows. That is, read address signals (RAx) and (RAy) from the timing control circuit (68) are sent to the dedicated memories (MHI), (MHI), and (MCI) in each of the small memories (Ml) to (Mlto.). Supplied. At this time, in this example, the address signal (RAx), (
RAy) so that the reading order is in the vertical direction of the screen.

As a result, each field memory (FBυ, (FRI)
, (FG,) and each dedicated memory (MBI), (MR
I) Image signals stored line-sequentially and horizontally in (MCI) are read out in the vertical direction (vertical direction) when looking at the entire image as shown in Figure 12A. Become.

Each dedicated memory (MBI), (MHI), (MCI)
The signal read out as described above is then applied to the switching signal (68) supplied from the timing control circuit (68).
fsw) into a serial signal. That is, the B memory switch (Sb) is turned on at the position of the blue phosphor layer corresponding to the scan position of each display element that is simultaneously scanned, and each B memory (MHI) or (MB,) is turned on.
At the position of the red phosphor layer, turn on the R memory switch (Sr) to output a signal from each R memory (MRI) or (MR,), and at the position of the green phosphor layer. At the position, by turning on the G memory switch (Sg) and outputting a signal from each G memory (MGυ or (MGz)), the serially converted BR
I'm trying to get a G signal. Then, these 1200 serial signals are sent to amplifiers (AMPI) to (AM
P, □. . ) to each cathode ray tube (81) to (8I!.

. ) to display the image.

In FIG. 8, the switching signal (f, ) is shown as one control line, but in reality, as shown in FIG. 9, there are three control lines (f xwt), (f swz), ( f s@
3) to control these three trees m (f xwt)+
(f 3Wri.

(r swz) is configured to supply phase-shifted switching signals as shown in FIG. 11.

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

As shown in FIG. 12B, the vertical synchronization signal (17msecH60Hz) 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 (68
) to each cathode ray tube (8
) vertical deflection (V CM) is made at the same time.

Since each cathode ray tube (8) has 8 lines in the vertical direction, this vertical deflection signal (Sv) is 8 x 60 = The frequency is 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 large screen display device, each adjacent cathode ray tube (
A transparent resin (13) having the same refractive index and expansion coefficient as the panels is embedded between the panels (2) of 8), so that the entire display surface is flush with no gap d (9). ) As shown in FIG. 5, the phosphor layer (B) (or (G)
), the light (2I) that passes through the side of the panel passes through the resin (13) and reaches the display surface (9
) is emitted from the Therefore, the outermost phosphor trio (4
) closer to the edge of the panel (2) to reduce the pitch P of the phosphor trio and achieve higher resolution.
There is no image disturbance in the vicinity of the panel edge of the cathode ray tube (8), and the viewing angle at which a clear image can be seen can be widened.

In addition, in this large screen display device, the phosphor trio (4) is formed at a predetermined arrangement pitch P over the entire display surface.
You can obtain high-quality images with inconspicuous seams. Furthermore, even when the screen is viewed from the side, there is no phenomenon in which the outermost phosphor (G) or (B) of the phosphor trio (34) existing at the side edge becomes invisible as shown in Figure 14. in this case,
(The field of view that can be seen as a good image is narrower), and the field of view that can be seen as a good image is wider than before.

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

FIGS. 6 and 7 respectively show other embodiments of the present invention. In the example shown in FIG. 6, a light absorbing layer (14) made of carbon or the like is formed on the side end surface of each cathode ray tube (8) constituting the large screen display device (11), that is, on the panel peripheral surface.

According to this configuration, the outermost phosphor layer (B) (or (C)
)) toward the side of the panel is absorbed by the light absorption layer (
14) and is no longer emitted to the outside. Therefore, image disturbance near the panel edge is avoided, and the viewing angle in the large screen display device can be widened as in the above example.

In the example shown in FIG. 7, the side end surfaces of each cathode ray tube (8) constituting the large screen display device (11), that is, the panel peripheral surface are roughened to form one light scattering surface (15). According to this configuration, unnecessary light (11) directed from the outermost phosphor layer (B) (or (G)) toward the side of the panel is transferred to the light scattering surface (15).
Unnecessary light (l,) scattered by the panel and emitted to the outside through the side surface of the panel is substantially reduced. This avoids image disturbance near the panel edge, and as in the above example, it is possible to widen the viewing angle in the large screen display device.

The above example was applied to a large screen display device consisting of a large number of cathode ray tubes arranged with phosphor screens such that the longitudinal directions of the phosphor layers R, G, and B are parallel to the display surface. , can also be applied to a large screen display device consisting of a large number of cathode ray tubes arranged to horizontally scan electron beams and each having a phosphor screen with the longitudinal direction of the phosphors NR, G, and B perpendicular to the display surface. .

[Effects of the Invention] According to the large screen display device according to the present invention, since a transparent material having a refractive index close to that of the panel is disposed between adjacent cathode ray tubes, the thickness of the funnel can be reduced. Even if the pixel pitch is reduced by thinning the screen, image disturbance near the edges of each panel can be avoided, and the viewing angle can be widened even when the resolution is increased.

In addition, by using the side end surfaces of the cathode ray tube as light scattering surfaces or light absorbing surfaces instead of the above materials, unnecessary light at the panel edges can be reduced or blocked, and the viewing angle can also be expanded. can.

Therefore, it is possible to provide a large screen display device that has high quality and high resolution and fully functions as a large screen.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a cathode ray tube according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a front view of a large screen display device according to the present invention, and FIG. 4 is a front view of a large screen display device according to the present invention. An enlarged view of the main parts showing an example, Fig. 5 is a sectional view of the main parts, Figs. 6 and 7.
The figures are sectional views of essential parts showing other examples of large screen display devices according to the present invention, FIG. 8 is a block diagram showing an example of operating means of the large screen display device, and FIG. 9 is an operation of an image processing circuit. Part 10 is a block diagram showing the configuration of the field memory and dedicated memory, Fig. 11 is a timing chart of switching signals, Fig. 12 is an explanatory diagram showing the scanning order and horizontal and vertical deflection waveforms, and Part 13 is a block diagram showing the configuration of the field memory and dedicated memory. 14 is a front view of a main part of a large screen display device according to another conventional example, and FIG. 15 is a large screen display for explaining the present invention. FIG. 3 is a cross-sectional view of the main parts of the device. (1) is a tube, (2) is a flat panel, (3) is a funnel, (4) is a phosphor trio, (5) is a phosphor surface, (11)
(12) is a frit, (13) is a resin, (14) is a light absorption surface, and (15) is a light scattering surface. Representative Hidemori Matsukuma Painting IXJ Person Indicator 1 Example of 9th Gen. Koku No. 10 8361 fsw + Ichigo ■-- and 111 switch) De 1 color number ly1 Minde chart No. 11 Running 11 Jun and horizontal, Word direct S1 Darkness; Shoulder Getta and Shiguchi clam Roen Figure 12 misfire 1! Corner crotch! 1AI=(ヰTrutshu□Fishing mouth 15th
Figure 2F Continuation of Fusho 1. Display of the case Heisei 1JL/Patent Application No. 2, Name of the invention No. 33274 Large screen display device 3, Person making the amendment Relationship to the case Patent applicant address Tokyo Parts Co., Ltd. 8 Kitahina No. 6-7-35 Name ( 2
18) Sony Corporation Representative Director Norio Ohga 4, Agent

Claims (1)

[Scope of Claims] 1. In a large screen display device in which cathode ray tubes are arranged in a matrix, a transparent material having a refractive index close to that of the panel of the tube body is disposed between each adjacent cathode ray tube. A large screen display device made up of 2. A large screen display device in which cathode ray tubes are arranged in a matrix, the large screen display device comprising a side end surface of the cathode ray tube as a light scattering surface or a light absorption surface.