JPS60149272A - Data transmission method of display device - Google Patents

Abstract

PURPOSE:To simplify the assembling and control processes of a display device as well as the transmission of signals by dividing many display cells every prescribed units to form a display unit containing those divided cells arrayed 2-dimensionally and transmitting continuously the drive data for each display unit. CONSTITUTION:The video signals supplied from a camera 101, a VTR102 and a tuner 103 are selected by an input changeover switch 104 and applied to a decoder 105 to deliver three primary color signals. These color signals are converted into digital signals by A/D converters 106R-106B, and scanning lines are converted into a prescribed number of pieces by memories 171R-171B and 172R-172B equivalent to a field. These outputs of conversion are selected by a data selector 108 and processed by a multiplexer 109 and an optical converter 110. Then many display cells are divided every prescribed units, and these divided cells are supplied continuously to horizontal arrays 401-403 of units arrayed 2-dimensionally. This simplifies the assembling and control processes of a display device as well as the transmission of signals.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention arranges a large number of display cells two-dimensionally and drives each of these display cells with desired data to obtain a desired i! !
! The present invention relates to a data transmission method for a display device that displays an I image.

BACKGROUND ART AND PROBLEMS There has been proposed a display device in which a large number of display cells are two-dimensionally arranged and each of these display cells is driven with desired data to display a desired image.

As a display cell used in such a device, the applicant of the present application previously proposed the following.

FIGS. 1, 2, 3, and 4 are a plane view showing the display cell, a sectional view taken along line A-A, and a line B-B.
A cross-sectional view along the line and a partially broken perspective view are shown. In the same figure, 11) indicates a glass tube consisting of a front panel (l^), a back plate (Ill), and a side plate (IC), and inside this glass tube +11 there are multiple fluorescent displays consisting of a phosphor layer. segments (21 ((2R), (2G), (2B)) and a plurality of cathodes (K) ((KR),
(KG), (KB)) and first grid (control electrode) C
01) ((, GIR), (G IG ), (GIB))
and a common second grid (acceleration electrode (G2)).The fluorescent display segment (2) is formed by depositing a phosphor layer on the inner surface of the front panel (1^). In this case, three fluorescent display segments (2R), (2G), and (2B) for red, green, and blue light are formed.Specifically, as shown in Fig. 5, the front panel (l^) A carbon layer (3), which is a conductive layer, is printed on the inner surface of the frame in the form of a frame, and a red phosphor layer (2R) and a green phosphor layer, which become each display segment, correspond to each empty space within the frame. A light layer (2G) and a blue phosphor layer (2B) are formed by printing so as to partially overlap the carbon layer (3), and an intermediate layer 1i (
A metal back layer (5) made of, for example, aluminum is deposited via 41. Wire cathodes (KR), (KG), and (Ks) are installed inside the back panel (IB) so as to face the display segments (2R), (2G), and (2B) formed by the phosphor layers, respectively. Opposite each wire cathode (KR), (Kci), (KR) are the first grids (GIR), (GIG), (GIB), respectively.
), and three first grids (GIR),
A second grid (G2) is arranged in common between (G 1a ) and (G hs ). Each wire cathode (K) is formed, for example, by coating the surface of a tungsten heater with carbonate, which is an electron-emitting substance.

Each wire cathode (KfL), (KO), (Kl) is strung between a pair of conductive supports (6), (7) respectively arranged on both sides of the back panel (IB). One support part (6
) is for fixing one end of the wire cathode, and the other support part (7) is provided with a spring part (7a), and the other end of each wire cathode is fixed to this spring part (7a). As a result, even if the wire cathode stretches due to a rise in temperature, the stretch is absorbed by the spring portion (7a) and the wire cathode does not loosen. Each first grid (G IR), (G IG), (G IB
) is formed in a semicylindrical shape with a cylindrical surface facing each wire cathode, and a large number of slits +81 are provided on the cylindrical surface at a predetermined pitch along the longitudinal direction. This slit (8) is a hole through which electrons emitted from the wire cathode (K) can pass. The second grid (G2) is connected to each of the first grids (GIR), (C; to ), (G
1B) in the part corresponding to the slit (8) of the first grid.
) is formed by forming a slit (9) at the same corresponding position. In this case, the slit part (9) of the second grid (G2)
R), (9G), and (9B) are the corresponding first grids (
G IR ), (G IG ), and (' G 111 ) can be configured to have a concentric cylindrical surface. In this case, the electron beam from the wire cathode is
It radiates linearly through the grid and the slits (8), (9) of the second grid and is spread out in the longitudinal direction of the slits. On the other hand, as shown in FIG. 6, the second grid may have a horizontal portion where the slit (9) is formed. At this time, the electron beam is on the dotted line (30”)
As shown in the figure, the radiation passes through the second grid and is bent somewhat inward in the longitudinal direction of the slit.

On the other hand, each fluorescent display segment (2R), (2G) 1,
? A separator a made of a conductive material is arranged to surround (2B). This separator α is such that the electron beam from the cathode is connected to the first or second grid (G1), (G
2), a shield is provided to prevent the secondary electrons (31) (No. 11G in Figure 6) from emitting light from the adjacent fluorescent display segments, and a shield is provided from each wire cathode (K). The electron beam (30) serves to spread the electron beam so that the entire corresponding fluorescent display segment (2) is irradiated, and to form a so-called diffusion lens.
At the same time a high voltage e.g. 10kV is applied to each fluorescent display segment.
It is also used as a power supply means to provide power. When assembling this separator al, the glass tube body (
It is supported between the front panel (1^) of υ and the side plate (IC) and fixed by a frit. That is, the separator (Im
As shown in FIG. 7, each fluorescent display segment is surrounded by a bar partitioned into three parts, and one of the upper ends of the bar has supporting claws protruding outward from each other on opposite sides. (
11) are provided, and further anode leads (
12) is derived.

Also, on the side of the separator there is an elastic bending piece (1 piece) for positioning.
3) is excised. Therefore, when the separator frame is inserted into the side plate (IC) of the glass tube body from above, the supporting claw (11) just comes into contact with the upper hemorrhoid of the side plate (IC), as shown in No. 8 and 1, and the separator is removed. is supported, and at the same time the bent part (
13) is brought into contact with the inner wall of the side plate (IC) so that the separator is located at the center. Further, a protrusion (14) bent inward is provided at the upper end of the separator frame, and a protrusion (15) is provided on the surface of the protrusion (I4). This protrusion (15) comes into contact with the carbon layer (3) just when the separator aI is housed in the side plate (IC) and the front panel (IA) is overlaid and sealed on the side plate (IC) (Fig. 9). reference).

This allows the high voltage from the anode lead (12) to be commonly supplied to each fluorescent display segment (2R), (2G), (2B) in the assembled state.
The anode lead (12) to which high voltage is applied is led out through the sealing portion between the front panel (IA) and the upper end surface of the side plate (IC). In addition, the wire cathode (K) lead, the first grid (G1) lead, and the second grid (G
The leads of 2) are guided to the outside through the sealing portion between the back plate (IB) and the lower end surface of the side plate (IC). In addition,
A plurality of leads of each of the cathode (K), first grid (G1), and second grid (G2) are led out in order to also serve as support. For example, each first grid (GIR), (G
1a), (G 111) have two leads on each side for a total of four leads (16Gz), (17Gt),
(18Gt) is derived. Also, the second grid (G2)
has four leads (
19G2) is derived. Also, a plurality of leads (20F) of the cathode (K) are led out to the left and right from each of the supporting members (6), respectively.
20F) are commonly connected to each supporting member (6) and (7), and the container box 1 grid (G1) and the 2nd grid (G
In 2), the corresponding leads are commonly connected.

The glass tube body (1) has a front panel (IA) and a side panel (IC).
and the back plate (IB) are sealed with each other by flipping (22). A tip-off pipe (21) for exhaust is fixed to the back plate (Ill) with a frit.

Next, the operation of such a configuration will be explained. An anode voltage of, for example, about 10 kV is supplied to the red, green, and blue fluorescent display segments (2R), (2G), and (2B) through the anode lead (12). Matata box 1 grid (G
IR), (G IG ), and (G 1B ) are each applied with a voltage of, for example, 0~30V, and the second grid (G
For example, a voltage of 300V is applied to 2). Wire cathode (KR), (Ko), (KB) is 60 per wire.
It is about 70 mW. In this configuration, the voltage on the anode side and @2 grid (G2) is fixed, and the
Selectively turned on by voltage applied to grid (G1),
It should be displayed off. That is, when 0■ is applied to the first grid (G1), the electron beam from the cathode (K) is cut off, and the corresponding display segment (
2) is not displayed with light emission. And the first grid (G1)
For example, when 30V is applied to the
G2) and hits the phosphor of the corresponding display segment (2) to cause it to emit light.

At this time, the voltage (30V) applied to the first grid (G1)
Emission brightness is controlled by controlling the pulse width (application time) of . Then, as shown in Figure 6, the cathode (K
) is spread by the separator αω and irradiated onto the entire surface of the display segment (2). Also, the electron beam from the cathode hits the first grid and the second grid, and the secondary electrons (31
) is generated, but this secondary electron (31) is transferred to the separator a
l prevents hitting the adjacent display segment (2). By selectively controlling the voltage of the first grid in this manner, each display segment (2R)
, (2G), and (2B) are selectively displayed with high luminance.

This fluorescent display cell (40) has a thin structure as a whole, and the leads on the low voltage side of the cathode, the first grid, the second grid, etc. are connected to the back plate (IB) of the glass tube (1).
Since the anode lead (12) on the high-voltage side is led out from the front panel (IA) side, dangers during discharge and wiring are avoided, and a stable light-emitting display can be obtained.

In particular, since a separator (101) to which an anode voltage is applied is arranged so as to surround each fluorescent display segment (2), a diffusing lens is constituted by this separator α, and the curvature is reduced by the first grid (G1). Even if the second grid (G2) is flat (in the case of Figure 6), the electron beam from the cathode (K) is lateral (slit direction).
The light spreads over the entire surface of the display segment (2).

At the same time, secondary electrons from the first grid or the second grid are blocked by the separator side and do not cause the adjacent cut-off display segments to emit light.

In addition, when performing color display (for example, in the case of a 9300° white screen), the brightness mixing ratio is approximately 7% for blue, approximately 13% for red,
Approximately 80% is green. Furthermore, when a wire cathode is used as an electron source, it is often used in a temperature restricted region in order to extend its life. Therefore, in order to increase the luminance of the green cathode compared to other cathodes, it is possible to solve this problem by increasing the number of cathodes. For example, the green cathode (Ka)
Two cathodes are used, and one each for red and blue cathodes (KR) and (KB). As a result, the total amount of electrons for green, for example, becomes larger than those for red and blue, making color display possible. Of course, using a plurality of other red and blue cathodes also has the effect of lengthening the life. In this way, by increasing the number of green cathodes compared to the others, the brightness can be increased and a good white balance can be obtained.

This eliminates excessive loading of the cathode and can extend the life of the fluorescent display cell. In reality, two wires are installed at a distance of about 0.8 to 11, and although the amount of electron emission will not be twice that of one wire due to the electron repulsion effect, it can be expected to increase by 70 to 80 percent. Incidentally, instead of increasing the number of cathodes, increasing the brightness of green can also be achieved by, for example, making the area of the phosphor layer wider than that of red and blue.

In addition, since the wire cathode is used in a temperature-limited region, that is, the cathode loading of the oxide cathode is used at a temperature of several tens of minutes, so that it does not appear red, the amount of electrons emitted from each cathode is small. One possible solution to this problem is, for example, to wind a tungsten wire in a spiral to substantially increase the surface area of the oxide, but if the length of the spiral is long, there is a risk that the cathode may loosen or vibrate. be. Taking these points into consideration, the wire cathode can be constructed as shown in FIGS. 10 and 11. In this example, a core wire (35) made of a commercial temperature material such as tungsten or molybrene is provided, and an insulating material (35) such as 1203 is provided on the surface of this core wire (35).
6) and a tungsten wire (
37) into a spiral, and Il! ll! An electron emitting substance (38) such as carbonate is deposited on the spiral portion by spraying or electrodeposition to form a directly heated cathode (34). In this case, the core wire (35) has both ends connected to one support portion (6).
) and the spring part (7a) of the other support part (7) by spot welding, etc., and are stretched under tension.
The support part (6') is fixed by spot welding or the like.

In this configuration, the core wire (35) has an insulator (36) attached to it.
Il on top! ll Wrap the cathode in a spiral shape and connect its core wire (3
By stretching 5) with a spring part, problems such as short-circuit between the spirals and thermal deformation of the spiral parts can be eliminated. and the substantial oxide surface area increases,
In addition, as shown in Figure 11, the temperature difference between both ends and the center of the cathode is reduced, and the uniform temperature distribution area (A) becomes wider, which together with the aim of increasing the amount of electron emission. It is possible to increase the allowable current amount from each cathode. Curve (1) shows the temperature distribution.

In this way, display cells are formed. In this case, by arranging separators that are supplied with the same high voltage as the display segments so as to surround each of the multiple fluorescent display segments, a diffusion lens is formed, and the electron beam from the cathode spreads laterally to display the display. The entire surface of the segment is irradiated.

Therefore, a high-intensity luminescent display can be obtained. In addition, the separator blocks secondary electrons from the control electrode or the accelerating electrode and prevents the cut-off adjacent display segment from emitting light, allowing stable light-emitting display.

Furthermore, when forming a display device using the above-described display cell, the following procedure is performed.

That is, as shown in FIG. 12, a plurality of display cells (40) as described above are arranged in a unit case (4I), for example, six vertically.
× horizontal 4 = 24 (11i1 are assembled to form one unit. By the way, when these plural display cells are assembled into a unit case, they are molded and fixed with resin etc. However, the anode voltage of this display cell is Since the voltage is about 10kV, if the fixation is incomplete, there is a risk that it will peel off when force is applied from the surface to remove dirt etc.Also, similar failures may occur due to deterioration over time.Therefore, the display cell It is necessary to securely fix the display cell (40) to the unit case.For this purpose, the display cell (40) is formed so that the entire panel (IA) of the glass tube body (1) protrudes outward from the side panel (IC). In this case, Figure 13A
It may extend all the way around as shown in
As shown in Figure B, it may be made to project only in one direction. On the other hand, as shown in FIG. 14, the unit case (41) is provided with a plurality of window holes (43), 24 in this case, through which the display cells (40) face on its front panel (42), and each of the window holes ( A stepped portion (44) into which the peripheral portion of the entire surface panel (IA) of the display cell is fitted is formed on the back side of the edge of the display cell (43). Then, the display cell (40) is inserted into the back side of the front plate (42) so that its front panel (IA) faces the through hole (43) of the unit case, and the fixing member (45) such as resin mode is inserted from the back side.
) to fix it. At this time, since the front panel (18) protrudes outward, the fixing member (45) and the unit case front plate (42)
The display cell (40) as a whole is firmly fixed to the unit case (41) by being sandwiched therebetween. In addition, if necessary, as shown in FIGS. 15 and 16, a locking piece (53) that is rotatable around the shaft (52) is provided, and the locking piece (53)
The projecting portion (50) of the front panel (18) of the display cell is held between the front panel (42) of the unit case and the front panel (42) of the unit case. After that, you can fix it even more securely by fixing it in resin mode or the like.

Furthermore, since the display cell has high brightness, the front panel side coated with the phosphor layer needs to be cooled. For this reason, when attaching the display cell to the unit case, a backing (54) made of silicone rubber or the like is interposed between the step (44) of the front plate (42) of the unit case and the front panel (1^). Furthermore, a transparent plate (55) made of, for example, polycarbonate is placed on the front, and a cooling liquid (56) is placed in the space formed by this transparent plate (55), the front panel (1^), and the window hole (43) of the unit case. Fill it with. Of course, at this time, the front plate (42) of the unit case is provided with coolant introduction grooves (57) that communicate with the respective window holes (43). Alternatively, a fan may be provided for air cooling.

Furthermore, by arranging a large number of these units, a giant image display device can be formed. That is, the above-mentioned units are combined, for example, 7 vertically by 5-35 horizontally to form a block, 5 blocks are arranged horizontally to form a sub-module, and these sub-modules are combined 9 vertically by 4-36 horizontally. As a result, a large display device measuring, for example, 25 m in length x 40 m in width can be formed. Note that the total number of cells in this case is 36 x 5 x 35 x 24 = 151.20 tM. Furthermore, the number of pixels is approximately 450,000, which is three times this number.

In addition, Fig. 17 shows a front view (A) and a cross-sectional view (A) of the entire device.
B) is shown. This whole thing is, for example, 42 meters high.

The building has a width of 47 m, and the upper part of the building is used as a display area, and this part has nine floors with each floor having a height of 2,688 m. Each floor is provided with four submodules horizontally. In addition, a stage for special events, a waiting room, and a central control room for display and operation of the stage are provided at the bottom.

A display device is thus formed. In this case, as described above, the unit is configured with, for example, 24 display cells, and this unit is used to perform the assembly, which makes the device easy to handle and easy to assemble. In the above example, the unit has a length and width of about 400111.

However, in this device, when transmitting display signals for each display cell, it is impossible to transmit the display signals for approximately 450,000 pixels in parallel. Therefore, transmission will be performed using the scanning method, but because it is configured as a unit as described above, conventional line sequential scanning requires many horizontal connections between each unit, which requires installation and other work. becomes extremely complicated.

Furthermore, since it is a huge device as described above, if analog signals are used for transmission, errors such as crosstalk and time axis errors are likely to occur. Therefore, transmission using digital signals is considered, but if a flat cable is generally used as a transmission path, the transmission speed is limited to about 300 kHz. On the other hand, the time to send a signal to the entire screen is limited to 1/30 seconds.

OBJECTS OF THE INVENTION In view of the above points, the present invention is intended to facilitate signal transmission as well as assembly and repair work.

Summary of the Invention The present invention provides a data transmission method for a display device in which a large number of display cells are two-dimensionally arranged and each of these display cells is driven with desired data to display a desired image. The plurality of display cells are divided into a predetermined number to form the two-dimensionally arranged display units, and data for the drive is continuously transmitted to each display unit, and the transmission The display device drives the display cells by sequentially switching the displayed data, and continuously transmits the data to the adjacent display unit after the data is transmitted to the negative display unit. This data transmission method simplifies signal transmission and also facilitates assembly and repair work.

In FIG. 18 of the embodiment, power/U (101), VTR (10
2>, a video signal from a signal source such as a tuner (103) is selected by an input changeover switch (104). This video signal is, for example, a composite signal of the NTSC system, and this signal is supplied to a decoder (105) and converted into three primary color signals of red, green, and blue. These three primary color signals are sent to AD conversion circuits (106R), (106G), and (106B), respectively.
) and is converted into, for example, an 8-bit parallel digital signal.

Each of these digital signals stores one field of memory.
(171R) (171G) (171B) and (172
R) (172G) and (172B) alternately. In these memories, scan line conversion is performed to form four scan lines from five scan lines, respectively, and further conversion is performed, for example, for each field of 189 scan lines, °ζ, 1 every 3 scan lines. A total of 63 (x8 bit parallel) outputs are taken out.

The order of extraction here is such that the signal is completed for each unit as described above. That is, when there are two adjacent units as shown in FIG. 19, the digital 7 and tal of pixels corresponding to each cell are sequentially taken out from one memory in the order of numbers assigned to each cell in the - field, 3 scan lines (201-204) (205) of the left unit
~208) (209~212) After the extraction of pixel data corresponding to
1 to 224) is taken out and sequentially moved to the right unit. Note that the scanning lines between the dashes are taken out from the other memory into the next field by interlaced scanning.

The data of each of these pixels is stored in each memory (171R) (
171G) (171B) or (172R) (17
2G> (172B) at the same time. Moreover, every three pieces 63 are taken out at the same time. This extracted data is supplied to the data selector (10B).

This data selector (108) selects red, green, and blue data for each field from the memory on the side that is not being written dot-sequentially, and 63 (x8 bit parallel) data signals are generated. It is formed. These data signals are supplied to a multiplexer (109) to
The bit-parallel signal is converted into a serial signal, and the converted signal is supplied to an optical converter (110) to be converted into an optical signal.

The optical signals of 63 three scanning lines formed in this way are sent to the optical fiber cables (301) and (302), respectively.
... (363) through the horizontal arrangement of each unit of the display device (401) (402) ... (463)
is transmitted to a central location.

Further, for example, in the horizontal arrangement (401) of the units on the upper side, an optical signal from an optical fiber cable (301) is supplied to a photoelectric converter (Ill) and restored to an electrical signal.This restored data signal is Demultiplexer (
112), and the serial signal is converted into 8-bit parallel signal. This data signal is connected to the pass line (113
), for example, 100 units (114z ) (1142)... (114soo
) in parallel.

Also, the signal from the photoelectric converter (111) is sent to the synchronous separation circuit (
115), and a synchronization signal according to a predetermined pattern or the like is separated. This synchronization signal is used by the timing generation circuit (1
16) and inverts every field as shown in FIG. 20A, FIG. 20B
Half period of frame pulse (1 field) as shown in
unit clock (255 cycles are formed during
The pixel clock (EC
K), the start pulse (s
s p> is generated. This frame pulse, unit clock and pixel clock are transmitted to each unit (1141) through a path line (113) together with the above-mentioned data signal.
) (1142) ... (114soo) in parallel, and the start pulse is supplied to the first unit (
114t).

Something similar is done in each of the 63 horizontal arrays.

In these units, the internal signal system is
It is configured as shown in Figure 1. In the figure, a 38-stage shift register (121) is provided, and a pixel clock (ECK) from the above-mentioned timing generation circuit (11B) is provided.
is supplied to the clock terminal of the register (121), and a start pulse (SSP) is supplied to the data terminal of the register (121).

As a result, from each stage of the register (121), signals S1 and S2 are sequentially shifted as shown in FIG. 20E.
...S38 is obtained. Si-33G of these signals
are the 1iIj elements (2
01R) (201G) (201B) (202R)
(202G) (202B)... (2121?
) (212G) (212B) and each cell (2
01' ) ~ (212') (201'R) (201
'G) (201'B) (202'R) (202'G
) (202'B)...(212'R) (212
'[) (212'B). Note that the circuits inside the dashed dotted lines in the figure are the same.

Also, data signals as shown in FIG. 20F from the pass line (113) are transmitted to pixels (201R) to -(212'B).
are supplied in parallel. Also, frame no <)less (F
P) is supplied to the pixels (201R) to (212B), and the phase is inverted by the inverter (122) to create the image IA.
(201'R) to (212''B).Furthermore, the signal S3@ from the register (121) is supplied to the D-free-knob-fro-nof'' (123), and the signal as shown in FIG. 20G is supplied. Start pulse (S
SP') is formed.

Further, in each pixel, the internal signal system is configured as shown in FIG. In the figure, an 8-bit latch circuit (131') is provided, and a /zl line (113') is provided.
) is provided to the data terminal. or,
Frame pulse (F P) or another phase inverted signal and one of the signals 81 to 33g
), and this AND output power is supplied to the latch circuit (131
) is supplied to the control terminal of the A further 8-bit down counter (133) is installed, and the output of the latch circuit (131) is fed to the preset terminal. Also, the load pulse (signal 5311) of the shift register (121)
is supplied to the load terminal of the counter (133), and the uni-nodokuro-tsuk (UCK) is supplied to the counter (133).
33). This counter (1
33) is extracted and used as the drive signal for the first grid.

Also, the signal indicating that it is not all O is impark (13
4), the phase is inverted and the signal is supplied to the count inhibit terminal of the counter (133).

Signals S1 to G1 are sent to these units and pixels in the secondary gate.
At the timing of S36, the data from the pass line (113) is transferred to each corresponding pixel Nochi II! Circuit (131
), and is preset to the counter (133) at the timing of the signal 5311, and this counter (133
) is counted down until it becomes all 0, thereby forming a PWM signal in accordance with each data in the counter (133). Here, the counter (133) is counted down by the unit clock (UCK), and since the unit clock has 255 cycles between one field, one field is lit continuously at the maximum value of data,
From then on, 256 gradations are obtained up to no lighting. The first grid of each pixel is driven by this PWM signal.

Furthermore, the signal is 3m! A start pulse for the next unit is generated at timing 1, and the same operation is performed sequentially for the 100 horizontally arranged units. Note that data is launched to each unit using the unit clock (UCK).
), and completes in 200 cycles for 100 units in a horizontal array. The remaining 55 cycles can then be used to transmit special control signals such as synchronization signals.

Also, in the next field, the frame pulse (FP)
By inverting , a similar operation is performed for the other pixel in interlaced scanning. At this time, the preset pulse is repeatedly supplied to the previous pixel, so that the same display is performed twice in each field in each pixel.

As a result, display is performed using 100 units arranged horizontally. Furthermore, by performing this in parallel for 63 units in the vertical direction, the entire image is displayed.

In this way, a gigantic image measuring, for example, 25 m in height x 40 m in width is displayed, but according to the above-mentioned device, data is transmitted continuously for each unit, and the data transmission to the - display unit is delayed. After the display is completed, the display is transmitted to the next adjacent display unit, so that the display operation is completed in each unit. For this reason, wiring between units requires a start pulse (SS) from the previous unit to the next unit.
Only one line for transmitting P) is required, making the connection extremely simple. Note that data signals and the like may be connected to the pass line using multiple connectors.

Therefore, when installing or replacing the unit, the work becomes simple, and assembly and repair become easier. In other words, for example, if one unit breaks down, all you have to do is bring in a replacement unit and replace it with the faulty unit.Since there are fewer lines to connect at that time, replacement can be done quickly and easily. . Furthermore, the risk of accidents due to connection leakage, etc. is also reduced.

In addition, as an emergency, by simply bringing a counter capable of counting 3B and connecting it between the input and output of the start pulse, the failed unit can be removed without affecting other parts. Furthermore, it is suitable for unit inspection because the signal is completed within the unit.

Furthermore, since data is transmitted in parallel for each horizontally arranged unit, the transmission speed is reduced. For example, the data transmission speed with a flat cable (pass line) is 8 60 x 255 M - = 290.7 kllz, which is below the allowable range (300kHz).

In addition, two fields of interlaced scanning are sent per frame, and data is rewritten to each pixel only once per frame, but display is repeated for each field, and the display Since the frequency is 60112, the occurrence of flicker can be suppressed.

Effects of the Invention According to the present invention, signal transmission is simplified, and assembly and repair work is also facilitated.

[Brief explanation of the drawing]

Figures 1 to 17 are diagrams for explaining a display device previously proposed by the applicant, Figure 18 is a block diagram of an example of the present invention, and Figures 19 to 22 are diagrams for explaining the display device. It is a diagram. (101) to (103) are signal sources, (104) is a switch, (105) is a decoder, (106R) (1061
;) (106B) is an AD conversion circuit, (17111) (
171G) (171B) (172R) (172ε)
(172B) is a memory, (10B) is a data selector, (109) is a multiplexer, (110) is an optical converter, (111) is a photoelectric converter, (112) is a demultiplexer, (113) is a pass line, ( 1141) (11
42) ... (114too) is a unit, (1
15) is a synchronous separation circuit, (116) is a timing generation circuit, (121) is a shift register, (122) is an inverter, (123) is a D flip-flop, (131) is a latch circuit, (132) is an AND circuit, (133) is a down counter, (134) is an inverter, (201) ~
(212) is a cell, (201R) to (212B) are pixels, (301) to (363) are optical fiber cables, (
401) to (463) are horizontal arrays of units. Figure 1 Sada Figure 2 Figure 3 Figure 5 Figure 6 Figure 1δ Figure 9 Figure 17A

Claims (1)

[Claims] A data transmission method for a display device in which a large number of display cells are two-dimensionally arranged and each of these display cells is driven with desired data to display a desired image, the method comprising: is divided into a predetermined number to form the two-dimensionally arranged display units, data for the drive is continuously transmitted to each display unit, and the transmitted data is sequentially switched. A data transmission method for a leather display device, which drives the display cell and continuously transmits data to the adjacent display unit after the transmission of the data to the display unit is completed. .