KR900000356B1 - Luminescent display cell - Google Patents

Abstract

a hermetically sealed glass envelope having a front panel, a side wall and a rear plate ; a plurality of luminescent segments formed on the inner surface of the front panel ; a respective cathode, adjacent to the rear plate, for each of the luminescent segments ; a respective control grid electrode arranged between a respective segment and the respective cathode for each segment ; a common accelerating electrode arranged between the segments and the control grid electrode ; and means for applying an anode voltage to the luminescent segments, an accelerating voltage to the accelarating electrode.

Description

Fluorescent Display

1 is a front view of a fluorescent display device of the present invention, particularly a unit cell.

2 is a cross-sectional view taken along line A-A.

3 is a cross-sectional view taken along line B-B.

4 is a partially broken perspective view.

5 is an enlarged cross-sectional view of the display segment.

6 is a cross-sectional view for explaining the operation of the separator.

7 is a perspective view of a separator.

8 is a plan view of a state where the separator is disposed in the side plate of the tube.

9 is a cross-sectional view of the display segment and the separator portion.

10 is a sectional view of another example of a wire cathode;

11 is a perspective view showing a state of disguise.

12 is a front view showing one unit into which a plurality of display cells are inserted.

13A and 13B are perspective views each illustrating another example of the display cell.

14 is a cross-sectional view taken along the line C-C in FIG.

15 is a cross-sectional view showing another attachment method.

Figure 16 is its rear view.

* Explanation of symbols for the main parts of the drawings.

1: Glass tube 2R, 2G, 2B: Fluorescent display segment

G _1R , G _1G , G _1B : control electrode G ₂ : acceleration electrode

K _R , K _G , K _B : cathode 10: separator

35 core wire 36 insulator

37: tungsten wire 38: electron-emitting material

41: unit case 42: front panel

43: window hole 45: fixing member

55: transparent plate 57: coolant

The present invention relates to a fluorescent display device of high luminance.

There is an attempt to develop a large display device in which a plurality of light emitting display cells are arranged to obtain a large screen. In this case, it is desired that each light emitting display cell is composed of a thin type as a whole and that high luminance light emission is stably performed.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a novel fluorescent display device having a thin and stable high luminance light emission.

According to the present invention, a plurality of fluorescent display segments to which high pressure is applied, a plurality of cathodes and a plurality of control electrodes (first grids) disposed corresponding to each segment, and a common acceleration electrode disposed between the segments and the control electrodes 2 grids) and a voltage display of each control electrode to control the display of each segment selectively.

According to the fluorescent display device of the present invention, a display having a high shape and stable high luminance light emission can be obtained.

Next, embodiments of the fluorescent display device according to the present invention will be described in detail with reference to the drawings.

1, 2, 3, and 4 show a fluorescence display device of the present invention, in particular, a front view showing the unit cell, a cross sectional view along the AA line, a cross sectional view on the BB line, and a partially broken perspective view. 1 shows a glass tube composed of a front panel 1A, a back plate 1B, and a side plate 1C, and includes a plurality of fluorescent display segments 2 having a phosphor layer in the glass tube 1 [ (2R), (2G), (2B)], and a plurality of cathodes K ((K _R ), (K _G ), (K _B )) and a first grid (control electrode) corresponding to each display segment ) (G ₁ ) [(G _1R ), (G _1G ), (G _1B )] and a common second grid (acceleration electrode) G ₂ are arranged. The fluorescent display segment 2 is formed by depositing a phosphor layer on the inner surface of the front panel 1A. In this case, three fluorescent display segments 2R, 2G, 2B, and red light emission, green light emission, and blue light emission are formed. ) Is formed. Specifically, as shown in FIG. 5, the carbon layer 3, which is a conductive layer, is printed on the inner surface of the front panel 1A in a frame shape, and each display segment is formed in correspondence with each complaint in the frame. Each of the red phosphor layer 2R, the green phosphor layer 2G, and the blue phosphor layer 2B is formed by printing so as to be spread over some of the carbon layer 3, and the intermediate film 4 on the entire surface thereof. ), For example, a metal back layer 5 made of aluminum is coated and formed. Wire cathodes K _R , K _G , and K _{B on the} inside of the back panel 1B so as to face the display segments 2R, 2G, and 2B by the phosphor layers, respectively. The first grids (G _1R ), (G _1G ), and (G _1B ) are disposed to face each wire cathode K _R ), (K _G ), and (K _B ), and three first grids G The second grid G ₂ is disposed in common to _1R ), (G _1G ), and (G _1B ). Each wire K is formed by apply | coating the carbonate which becomes an electron emission substance to the surface of a tungsten heater, for example.

Each wire cathode K _R , K _G , and K _B is impersonated to a pair of conductive supports 6, 7 arranged on both sides of the rear panel 1B, respectively. One supporting portion 6 fixes one end of the wire cathode, and the other supporting portion 7 is provided with a spring portion 7a, and the other end of each wire cathode is fixed to the spring portion 7a. As a result, even if the wire cathode is extended in accordance with the temperature rise, the extension is absorbed by the spring portion 7a and the wire cathode is not relaxed. Each first grid (G _1R ), (G _1G ), (G _1B ) is formed in a semi-circular shape having a cylindrical surface to face each wire cathode, and the cylindrical surface has a plurality of pitches in the longitudinal direction, with a predetermined pitch The slit 8 is installed. This slit 8 is a transmission hole of electrons radiated from the wire cathode K. As shown in FIG. The second grid G ₂ forms a slit 9 at a corresponding position, such as the slit 8 of the first grid, at a portion corresponding to each of the first grids G _1R , G _1G , and G _1B . It is configured by.

In this case, the slit portions 9R, 9G, and 9B of the second grid G ₂ are concentric cylindrical surfaces with the corresponding first grids G _1R , G _1G , and G _1B , respectively. It can be configured to have. In this case, the electron beam from the wire cathode is linearly radiated through the slits 8 and 9 of the first grid and the second grid, and widened with respect to the longitudinal direction of the slit. As the second grid, the portion where the slit 9 is formed may be formed horizontally as shown in FIG. At this time, the electron beam is radiated to bend inwardly with respect to the longitudinal direction of the slit through the second grid as shown by the dotted line 30 '.

On the other hand, the separator 10 made of a conductive material is disposed to surround each of the fluorescent display segments 2R, 2G, and 2B. The separator 10 has a fluorescent display in which the electron beam from the cathode touches the first or second grid G ₁ , G ₂ , and the secondary electrons 31 (see FIG. 6) adjacent therefrom are adjacent thereto. A shield for preventing this from emitting a segment and an action of widening the electron beam so that the electron beam 30 from each wire cathode K is irradiated to the entire corresponding fluorescent display segment 2, so-called diffusion. It is also used as a power supply means for forming a lens and simultaneously applying a high voltage, for example, 10 KV, to each formed display segment. The separator 10 is supported between the surface panel 1A of the glass tube 1 and the side plate 1C at the time of assembly, and is fixed by frit. In other words, the separator 10 is formed in a three-layered frame so that each fluorescent display segment is surrounded, as shown in FIG. 7, and a support click 11 protruding outwardly on both sides of the upper end is provided. In addition, the anode leads 12 for supplying high voltage (anowood voltage) respectively to the opposite sides of the other side are derived. Moreover, the elastic bending piece 13 for positioning is seasoned in the side part of a separator. Therefore, when the separator 10 is inserted into the side plate 1C of the glass body from above, as shown in FIG. 8, the support click 11 abuts against the upper end surface of the side plate 1C, and the separator is supported, (13) abuts on the inner wall of the side plate 1C so that the separator is positioned at the center. In addition, the upper end of the separator 10 is provided with a protrusion 14 that is bent inward, and a protrusion 15 is provided on the surface of the protrusion 14. This protrusion 15 contacts the carbure layer 3 when the separator 10 is accommodated in the side plate 1C and the surface panel 1A is overlapped and encapsulated on the side plate 1C. (See Figure 9).

As a result, the high pressure from the anode lead 12 is supplied to each of the fluorescent display segments 2R, 2G, and 2B in common. In the assembled state, the anode lead 12 to which high pressure is applied is led out to the outside through the sealing portion between the top panel 1A and the top surface of the side plate 1C. The lead of the wire cathode K, the lead of the first grid G ₁ , and the lead of the second grid G ₂ are respectively encapsulated between the bottom plate 1B and the bottom surface of the side plate 1C. Gina is drawn to the outside. Each lead of the cathode K, the first grid G ₁ , and the second grid G ₂ serves as a support, and thus a plurality of leads are derived. For example, each of the first grids G _1R , G _1G , and G _1B is derived from four leads 16 _G1 , 17 _G1 , and 18 _G1 , two on each side. In addition, four leads 19G ₂ are derived from the second grid G ₂ so as to correspond to the four ears of the rear panel. In addition, the lead 20F of the cathode K is led to the left and right of each of the supporting members 6 and 7, respectively.

The leads 20F of the respective cathodes are commonly connected to the supporting members 6 and 7, respectively, and the leads corresponding to the respective _first and second grids G ₁ and G ₂ are commonly connected. do.

The glass tube 1 is constituted by encapsulating the front channel 1A, the side plate 1C, and the back plate 1B with the frit 22. An exhaust step-off pipe 21 is fixed to the rear plate 1B by frit.

Next, the operation of this configuration will be described. Each of the red, green, and blue fluorescent display segments 2R, 2G, and 2B is supplied with an anode voltage of, for example, about 10 KV through the anode lead 12. In addition, for example, a voltage of 0 V to 30 V is applied to each of the first grids G _1R , G _1G , and G _1B , and a voltage of 300 V is applied to the second grid G ₂ , for example. do. The wire cathodes (K _R ), (K _G ) and (K _B ) are about 60 to 70 mw per one. In this configuration, since the voltage is fixed at the anode side and the second grid G ₂ , the on-off display is selectively performed by the voltage applied to the first grid G ₁ .

That is, when 0 V is applied to the first grid G ₁ , the electron beam from the cathode K is cut off, and the corresponding display segment 2 is not light-emitting displayed. When 30 V is applied to the first grid G ₁ , for example, the electron beam from the cathode K is accelerated to the second grid G ₂ after passing through the first grid G ₁ , and corresponding display segment ( Tap the phosphor of 2) to make it light-emitting. At this time, the light emission luminance is controlled by controlling the pulse width (application time) of the voltage 30V applied to the first grid G ₁ . As shown in FIG. 6, the electron beam from the cathode K is widened by the separator 10 and irradiated to the entire surface of the display segment 2. In addition, although the electron beam from the cathode touches the first grid and the second grid, secondary electrons 31 are generated from the first and second grids, but the secondary electrons 31 are separated by the separator 10. The display segment 2 which is blocked and adjoins is not beaten. By selectively controlling the voltage of the first grid in this way, each of the display segments 2R, 2G, and 2B selectively emits light with high brightness.

In the fluorescent display cell 40, the whole is made thin. Furthermore, the lead of the low voltage side such as the cathode, the first grid, the second grid, and the like is drawn from the back plate 1B side of the glass tube 1, Since the anode lead 12 on the side is led from the front panel 1A side, the risk of discharge and wiring is avoided, and stable light emission display is obtained.

In addition, since the separator 10 to which an anode voltage is applied is disposed to surround each fluorescent display segment 2, the separator 10 constitutes a diffusion lens, and only the first grid G ₁ has a curvature. Although the second grid G ₂ is flat (in the case of FIG. 6), the electron beam from the cathode K is widened in the horizontal direction (slit direction) and irradiated to the front 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 the cut-off adjacent display segment is not emitted.

In the case of color display (for example, a white screen of 9300 degrees), the luminance mixing ratio is about 7% for blue, about 13% for red, and about 80% for green. In addition, the wire cathode is often used in a temperature limiting area in order to have a life when using it as an electron source. Therefore, it is possible to solve the problem of increasing the number of cathodes in order to increase the luminance of light emitting green cathodes compared to other cathodes. For example, two green cathodes (K _G ) and one red and blue cathode (K _R ) and (K _B ) are used. As a result, for example, the total amount of electrons in green is larger than those in other red and blue colors, and color display is possible. And of course, the use of a plurality of different red and blue cathodes has the effect of extending the life. By increasing the number of green cathodes as above, the luminance can be increased, so that a good white balance can be obtained. This can lengthen the life of the fluorescent display cell by not excessively loading the cathode. In practice, the two are attached at a distance of about 0.8 to 1 mm, and the amount of electron emission is not twice that of one because of the electron repelling effect, but an increase of 70 to 80 percent can be expected. In order to increase the luminance of green, instead of increasing the number of cathodes, for example, the area of the phosphor layer may be larger than that of red and blue.

In addition, since the wire cathode is used in the temperature limiting area, that is, the cathode loading of the oxide cathode is used for one tenths so that it does not look red, the amount of electron emission from one cathode is small. As a method of solving this problem, for example, it is considered to substantially increase the surface area of the oxide by winding a tungsten wire in a spiral shape, but when the length of the spiral is long, there is a concern that loosening or vibration of the cathode occurs. In consideration of such a point, as the wire cathode, the same configuration as shown in FIGS. 10 and 11 can be considered. In this example, a core wire 35 such as tungsten or molybdenum, which is a high-temperature material, is provided, and an insulator 36 such as Al ₂ O ₃ is coated on the surface of the core wire 35, and a tungsten wire serving as a heater is placed thereon. (37) is wound in a spiral shape, and an electron-emitting material 38, for example, a carbonate, is attached to the spiral part by spraying or electrodeposition to form a casing 34 in series. In this case, both ends of the core wire 35 are fixed to the support part 6 on one side and the spring part 7a of the other support part 7 by spot welding or the like, and simulated in a tensioned state. The line is fixed between the support 6 on one side and the second support 6 'on the other side by spot welding or the like.

In this configuration, by winding the cathode in a spiral shape on the core wire 35 to which the insulator 36 is attached, and disguising the core wire 35 as a spring part, problems such as short circuit between the spirals and thermal deformation of the spiral parts can be eliminated. have. Substantially, the area of oxides increases, and as shown in FIG. 11, the temperature difference between both ends of the cathode and the center is small, and the uniform temperature distribution area A is widened, and the electron emission amount is increased. As a whole, the amount of allowable current from one cathode can be increased. Curve (I) shows the temperature distribution.

As described above, as shown in FIG. 12, a plurality of, for example, 24 units are inserted into the unit case 41 to form one unit. In addition, by arranging a large number of these units, a large image display device is constructed. However, when the plurality of display cells are inserted into the unit case, the molds are fixed by resin or the like. However, since the anode voltage of this display cell is as high as about 10 KV, if the fixing is incomplete, there is a possibility that the display cell is peeled off when a force is applied from the surface to remove the contamination on the surface side. In addition, the same failure is considered due to the change of time.

Therefore, it is necessary to secure the display cell to the unit case. For this reason, as the display cell 40, the front panel 1A of the glass tube 10 is formed so as to extend outward from the side plate 1C. In this case, as shown in FIG. 13A, you may extend over the whole pole. Alternatively, as shown in Fig. 13B, only one direction may be opened, while the unit case 41 has a plurality of display cells 40 facing the front plate 42 as shown in Fig. 14. In this case, 24 window holes 43 ) Is formed, and the end 44 of the front panel 1A0 of the display cell is fitted to the rear side of the edge of each window hole 43 so as to form the display cell 40. The front panel 1A is inserted into the rear surface of the front plate 42 so that the front panel 1A faces the through hole 43 of the unit case, and is fixed by the fixing member 45 such as resin mode from the rear surface. Fixed part in this elongate part 50 because it is extended outward The display cell 40 is firmly fixed to the unit case 41 by being sandwiched between the ash 45 and the front plate 42 of the unit case as shown in FIGS. 15 and 16 as necessary. As shown in the drawing, the locking piece 53 of the rotational material is provided around the shaft 52, and the elongated portion 50 of the front panel 1A of the display cell is interposed between the locking piece 53 and the front plate 42 of the unit case. After that, it is possible to fix more reliably by fixing it with a resin mode, etc. In addition, since it is a high brightness display cell, the front panel side to which the phosphor layer is applied needs to be liquid-cooled. Is mounted on the unit case, and the packing 54 such as silicone rubber is replaced between the end 44 of the front plate 42 of the unit case and the front panel 1A, and then on the front surface again. For example, by placing a transparent plate 55 made of polycarbonate or the like, the transparent plate 955) and the front plate The cooling liquid 56 is filled in the space formed by 1A and the window hole 43 of the unit case, and of course, the front plate 42 of the unit case has a coolant introduction groove 57 communicating with each window hole 43. This is installed.

In the above example, a display cell having three fluorescent display segments of red, green, and blue is described. However, the present invention can also be applied to a display device in which a plurality of fluorescent display segments are arranged in a pattern displaying ordinary characters, numbers, and the like. will be. That is, a plurality of fluorescent display segments are arranged so as to have an eight-character shape, for example, and a common anode potential is applied thereto. Then, a plurality of cathodes and a plurality of first grids are disposed to face each display segment, and a common second grid is disposed between these first grids and the display segments to control the voltage applied to the first grid. And selectively display the desired display segment.

According to the present invention described above, a high-luminescence fluorescence display device is easily obtained, and in this case, it is possible to operate stably and to make the whole thin. Therefore, a large display device can be easily configured by arranging a plurality of such display elements as a single cell.

Claims (2)

A plurality of fluorescent display segments to which high voltage is applied, a plurality of cathodes and a plurality of control electrodes disposed corresponding to the segments, and a common acceleration electrode disposed between the segments and the control electrodes, and the voltages of the control electrodes Controlling the light to selectively emit light of the segment. A flat panel comprising a front panel in which green, red, and blue light emitting segments are arranged in a horizontal direction, and a rear panel and side frame in which an electron source and an electronic control unit corresponding to each of the fluorescent display segments are arranged. A fluorescent display device characterized by arranging the fluorescent display cells in a matrix shape in a longitudinal and horizontal direction by using a fluorescent display cell as a unit.

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