JP2004127534A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve luminance by increasing the amount of electrons for exciting a phosphor of each unit pixel. <P>SOLUTION: Negative electrode selection electrodes CSG for hitting electrons from a plurality of negative electrodes (negative electrode wiring CL and electron sources K) against the phosphors of unit pixels are formed, between a positive electrode AE provided for a front panel PN2 and control electrodes (a strip electrode element) MRG provided for a back panel PN1, in parallel with an extension direction of the strip electrode element. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device that utilizes electron emission into a vacuum formed between two substrates, and in particular, controls a cathode wiring having an electron source and an extraction amount (emission amount) of electrons from the electron source. The present invention relates to a display device capable of displaying a high-quality image by stably and accurately installing a control electrode to be controlled.
[0002]
[Prior art]
2. Description of the Related Art A color cathode ray tube has been widely used as a display device excellent in high brightness and high definition. However, with the recent increase in image quality of information processing devices and television broadcasts, demands for flat displays (panel displays) having characteristics of high brightness and high definition, light weight, and space saving are increasing.
[0003]
As typical examples, liquid crystal display devices, plasma display devices, and the like have been put to practical use. In particular, a display device using electron emission from an electron source into a vacuum (referred to as an FED, an electron emission display device, or a field emission display device) or a device with low power consumption can be used as a device capable of increasing luminance. There is a tendency that various types of panel-type display devices, such as a characteristic organic EL display, are put to practical use.
[0004]
Among such panel type display devices, field emission type display devices include C.I. A. Those having an electron emission structure proposed by Spindt et al., Those having a metal-insulator-metal (MIM) -type electron emission structure, and those having an electron emission structure utilizing an electron emission phenomenon by a quantum theory tunnel effect (surface conduction electron Are also known, such as a diamond film, a graphite film, and an electron emission phenomenon using carbon nanotubes.
[0005]
The field emission type display device has a back substrate on which a cathode wiring having a field emission type electron source and a control electrode are formed on the inner surface, and a front substrate on which an anode and a phosphor are formed on the inner surface facing the back substrate. Then, they are bonded to each other by inserting a sealing frame into the inner peripheral edges thereof, and the inside thereof is evacuated. In some cases, a spacing member is provided between the back panel and the front panel in order to keep the spacing between the back substrate and the front substrate at a predetermined value. As a display device of this type, for example, "Patent Document 1" can be cited.
[0006]
[Patent Document 1]
JP-A-11-144652
[0007]
[Problems to be solved by the invention]
FIG. 13 is a developed perspective view schematically illustrating a schematic configuration of a field emission type display device. Note that among the configurations described with reference to FIG. 13, the technology related to the control electrode composed of a number of parallel strip-shaped electrode elements MRG is a configuration considered by the applicant at the examination stage and is not a known technology. In FIG. 13, this display device is configured by integrating a back panel PN1 and a front panel PN2, and a sealing frame MFL for forming a vacuum space between both panels. The back substrate SUB1 constituting the back panel PN1 has a plurality of cathode wirings CL having electron sources and a plurality of strip-shaped electrode elements MRG on an insulating substrate made of glass or alumina or the like. A control electrode lead line MRG-T is drawn out of the sealing frame MFL from one end of the strip electrode element MRG. The cathode lines CL extend in one direction (y-direction) on the rear substrate SUB1, and are arranged in large numbers in the other direction (x-direction) intersecting the one direction.
[0008]
The cathode wiring CL is patterned by printing a conductive paste containing silver or the like, and an electron source is formed thereon. Here, the description will be given on the assumption that the carbon nanotube CNT is used as a typical example of the electron source. However, it goes without saying that another electron source may be used. It is preferable that the color pixels are grouped into three groups of red (R), green (G), and blue (B) which constitute each color pixel (unit pixel). One or both ends of the cathode wiring CL are drawn out of the sealing frame MFL as a cathode wiring lead line CL-T.
[0009]
FIG. 14 is a schematic diagram illustrating a display operation of the display device shown in FIG. Note that, in FIG. 14, the entire panel PN2 is shown rotated by 90 degrees with respect to the rear panel PN1 for explanation. On the inner surface of the front panel PN2 opposed to the rear panel PN1, three color phosphors PHS (red: R, green: G, blue: B) partitioned by a light shielding film (black matrix) BM are provided. An anode AE is formed over the top. Note that the anode AE can also be formed below the three-color phosphor PHS and the black matrix BM (on the front substrate SUB2 side). One or a plurality of electron passage holes EHL are formed in the strip-shaped electrode element MRG as the control electrode at a position corresponding to the electron source of the cathode wiring. Electrons emitted from the cathode K at a potential between the selected strip electrode element MRG-S and the cathode wiring CL are generated from an electron source having the cathode wiring CL due to a potential difference between the cathode wiring CL and the strip electrode element MRG. The amount of emitted electrons (including on / off) is controlled, passes through the electron passage hole EHL of the strip-shaped electrode element MRG-S, is directed to the front panel PN2 side as indicated by the arrow, and the fluorescent light of the corresponding color It strikes the body and excites it to emit light in a predetermined color.
[0010]
The strip-shaped electrode element MRG, which is a control electrode, is manufactured as a separate component, and comes in contact with the cathode wiring CL having an electron source without a contact therewith (z direction: the front substrate SUB2 side constituting the front panel PN2) at a predetermined interval. Be placed. The band-shaped electrode element MRG is fixed to the rear substrate SUB1 by a fixing member provided outside the display area by a holding member (not shown) made of an insulating material such as a sealing frame MFL or a glass material.
[0011]
The inside sealed by the sealing frame MFL is evacuated, and ^-5 -10 ^-7 It is evacuated to Torr vacuum. The electron source is made of carbon nanotubes CNT, diamond-like carbon (DLC), other field emission cathode materials or field emission shapes. The control electrode composed of the strip-shaped electrode element MRG is provided on the rear substrate SUB1 on which the cathode wiring CL is formed, at a predetermined interval from the cathode wiring CL over the entire display area.
[0012]
The strip-shaped electrode element MRG is provided after the cathode wiring CL is formed on the rear substrate SUB1. The strip-shaped electrode elements MRG are formed by etching a thin plate made of, for example, aluminum or iron based on a photolithography technique so as to have one or a plurality of electron passing holes EHL in the thin plates of many strip-shaped electrode elements MRG. For example, it is formed by etching a thin plate having a thickness of about 0.05 mm, and is fixed by a pressing member (not shown) or a sealing frame MFL outside a region where an electron passage hole is formed in the display region AR. After that, the front panel PN2 is placed, fixed together with the back panel PN1 and the sealing frame MFL with frit glass or the like, and the display area AR surrounded by the sealing frame MFL is evacuated from the exhaust hole EXC shown in FIG. Is evacuated.
[0013]
[Problems to be solved by the invention]
However, in the above display device, since one unit pixel is formed at the intersection of one cathode wiring and one strip electrode element, the effective cathode area per unit pixel is the screen size, the resolution, and the strip electrode. Since the voltage applied between the cathode and the strip-shaped electrode element or between the cathode and the anode is limited due to the electron passage hole diameter of the element and the structure of this type of display device, the phosphor of one unit pixel The amount of electrons that excite (current for one unit pixel) is limited. Therefore, it is difficult to obtain sufficient luminance, and this has been one of the problems to be solved.
[0014]
SUMMARY OF THE INVENTION An object of the present invention is to provide a display device which solves the above-mentioned problem and which can greatly increase the amount of electrons for exciting a phosphor (unit phosphor) of one unit pixel to display an image having sufficient luminance. To provide.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method in which a phosphor of one unit pixel is provided between an anode provided on a front panel and a control electrode (a band electrode element) provided on a rear panel in parallel with the extending direction of the band electrode element. A cathode selection electrode for projecting electrons from a plurality of cathodes to the unit phosphor was provided.
[0016]
In other words, the display device of the present invention includes a front substrate on which an inner surface is formed with a phosphor screen and an anode on which a plurality of unit phosphors are arranged in a predetermined repetition, and which is provided in one direction and juxtaposed in the other direction. A large number of cathodes constituted by a plurality of cathode wirings having a light source, and intersect at least in a non-contact manner with the cathodes in the display area, and extend in the other direction and are arranged in parallel in the one direction so that the electrons from the cathodes face the front. A back substrate having a plurality of independent strip-shaped electrode elements having electron passing holes on the substrate side and having an inner surface facing each other and facing the front substrate at a predetermined interval, and a front substrate and a rear substrate which circumnavigate a display area. A display device which is interposed therebetween and is integrated with a sealing frame for holding the above-mentioned predetermined gap, and the inside of which is sealed by the sealing frame is kept at a vacuum.
[0017]
Then, a cathode selection electrode for exciting one of the unit phosphors on the front substrate with electrons generated from the plurality of cathodes was provided. This cathode selection electrode was constituted by a number of electrodes extending in a direction parallel to the extending direction of the strip-shaped electrode element and juxtaposed in a direction intersecting the extending direction of the strip-shaped electrode element. Further, the cathode selection electrode is disposed between the strip electrode element and the anode.
[0018]
According to the above-described configurations of the present invention, it is possible to sufficiently secure the excitation energy of the unit phosphor by significantly increasing the amount of current per unit pixel, and to obtain a bright and high-definition image display. Further, display unevenness due to variation in the electron emission ability of the electron source included in the cathode wiring is reduced.
[0019]
It should be noted that the present invention is not limited to the above configuration and the configuration of the embodiment described later, and it is needless to say that various changes can be made without departing from the technical idea of the present invention.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a main part of a rear substrate PN1 for schematically explaining a first embodiment of a display device according to the present invention. In FIG. 1, reference numeral SUB1 denotes a rear substrate, CL denotes a cathode wiring, K denotes an electron source, MRG denotes a strip-shaped electrode element constituting a control electrode, and EHL denotes an electron passage hole. Reference symbol CSG indicates a cathode selection electrode. As shown in FIG. 1, a large number of cathode lines CL extend in the y direction and are arranged side by side in the x direction. The strip-shaped electrode elements MRG extend in the x direction and are arranged in a large number in the y direction. Electron passing holes EHL are formed at the intersections of these strip-shaped electrode elements MRG with the cathode wires CL, and the electron source K is arranged on the cathode wires CL immediately below the electron passing holes EHL. Although FIG. 1 shows only one electron passage hole EHL, it is preferable to use a plurality of electron passage holes EHL.
[0021]
The strip-shaped electrode element MRG constituting the control electrode of the present embodiment is formed of an iron-based stainless steel material or a thin plate of an iron material, and the thickness thereof is, for example, about 0.025 mm to 0.150 mm. This thin plate is processed by photolithography or the like to form a number of parallel strip-shaped electrode elements MRG. The end is stretched and fixed to the back substrate SUB1 with a sealing material MFL or another fixing member described later.
[0022]
Above the strip-shaped electrode element MRG (on the front panel side (not shown): z-direction), a number of cathode selection electrodes CSG arranged in parallel with the extending direction of the strip-shaped electrode element MRG are provided. The cathode selection electrode CSG in this embodiment is a rod-shaped body having a rectangular cross section, but is not limited to this, and may have various shapes as described later.
[0023]
FIG. 2 is a main part plan view schematically illustrating another example of the configuration of the cathode selection electrode in FIG. FIG. 3 is a plan view of a principal part schematically illustrating still another configuration example of the cathode selection electrode in FIG. The cathode selection electrode CSG shown in FIG. 2 is a strip-shaped electrode, and is arranged between the strip-shaped electrode elements MRG which are arranged side by side as control electrodes. This cathode selection electrode CSG may be a flat plate having a uniform shape in the longitudinal direction, as shown in FIG. 1, but as shown in FIG. 2, it faces the electron passage hole EHL of the strip electrode element MRG. By forming the concave portion ALC in the portion, the width of the other portion of the cathode selection electrode CSG can be increased, and the mechanical strength against tension application during mounting on the rear substrate can be improved. In addition, by surrounding the electron passing holes of the strip electrode element MRG as shown in the drawing, a throttle effect is given to the electrons passing through the electron passing holes EHL, and the diffusion of the electrons can be suppressed.
[0024]
The cathode selection electrode CSG shown in FIG. 3 is similar to that of FIG. 2 in that it is arranged between the strip-shaped electrode elements MRG arranged in parallel as the control electrode. However, since the cathode selection electrode CSG is linear, In addition, the mechanical strength against the application of tension during mounting on the rear substrate can be further improved. And the cathode selection electrode CSG of this shape is easy to manufacture. It should be noted that instead of forming the above-described concave portion on the flat-plate-shaped cathode selection electrode CSG as shown in FIG. 2, a convex portion is formed on a portion facing the electron passage hole EHL of the strip electrode element MRG. You can also.
[0025]
In addition, since the size of the cathode selection electrode CSG in the longitudinal direction is significantly larger than the width, there is a possibility that the position may fluctuate due to external vibration or the like, particularly as the screen size increases. Since each of them needs to be electrically insulated, for example, they are pressed with an insulator strip or the like across the juxtaposed direction of the cathode selection electrodes CSG, or woven with the insulator strip or the like. It is desirable to use an anti-vibration structure.
[0026]
FIG. 4 is an explanatory diagram of the configuration and operation of the display device according to the first embodiment of the present invention. In the figure, reference numeral PN2 denotes a front panel, and one unit (phosphor of one color pixel) PHS is formed on the inner surface by unit phosphors R, G, and B of three colors partitioned by a light shielding film (black matrix) BM. The anode AE is formed thereon. FIG. 4 shows front panel PN2 rotated by 90 degrees with respect to rear panel PN1 for the sake of explanation. The configuration of the back panel PN1 is as described in FIG. In this embodiment, three electron sources K1, K2, and K3 included in one cathode line CL included in the rear panel PN1 correspond to one unit phosphor included in the front panel PN2. That is, the phosphor of a unit pixel constituting one color pixel is excited by the electrons E extracted from the three electron sources K1, K2, and K3.
[0027]
FIG. 4 shows a state in which the unit phosphor G among the three color unit phosphors R, G, and B is excited. Here, the unit phosphors R, G, and B are located immediately above each of the three electron sources K1, K2, and K3. A focusing voltage is applied to a cathode selection electrode CSG provided near the front panel PN2 side of the strip-shaped electrode element MRG, and electrons from three electron sources K1, K2, and K3 are concentrated on one unit phosphor (here, G). Let it. In FIG. 4, an on-voltage (+ potential) is simultaneously selected and applied to the strip electrode elements MRG1, MRG2, and MRG3, and the other strip electrode elements are off. Similarly, an on-voltage (+ potential) is applied to the cathode selection electrodes CSG2 and CSG3, and the cathode selection electrodes CSG1 and CSG4 at the ends are off.
[0028]
Therefore, electrons from the electron source K2 pass straight between the cathode selection electrodes CSG2 and CSG3 to the unit phosphor G, and electrons from the electron sources K1 and K3 pass between the cathode selection electrodes CSG1 and CSG2 and between the CSG3 and CSG4. When they pass, they are bent in the direction of the central electrons emitted from the electron source K2. As a result, the electrons E from the three electron sources K1, K2, and K3 excite one unit phosphor G to emit light in a predetermined color.
[0029]
FIG. 5 is a timing chart of driving pulses applied to the strip electrode element and the cathode selection electrode for explaining the operation of the display device according to the first embodiment of the present invention. The case where the (cathode wiring) CL is driven simultaneously is shown. In the figure, reference numeral SCP indicates a selection pulse, DATA indicates a display signal, and AR indicates a display area. The electron sources K1, K2, and K3 described above are present at intersections between the strip-shaped electrode elements MRG and the cathode lines CL, and the electron sources K1, K2, and K3 face the phosphors PHS (R, G, and B). The scanning is performed by selecting the strip-shaped electrode element MRG. For example, the display signal DATA is simultaneously input to the cathode wiring CL for the selected strip-shaped electrode element MRG1, MRG2, MRG3 (see FIG. 4), and the electron source Electrons are extracted from K1, K2, and K3.
[0030]
Assuming that the total number of lines on the phosphor screen side is N and the frame frequency is F, the selection time for one line (one cathode wiring) is 1 / N · F. This is similar to the driving of a general display device of this type. When driving three lines at the same time, the strip-shaped electrode element MRG (MRG2 in FIG. 4) facing the selected line on the phosphor screen side becomes the original selected line, and a selection pulse (gate pulse) SCP is applied thereto. Since three lines are driven simultaneously, the selection pulse (gate pulse) SCP is applied to the upper and lower lines in the figure.
[0031]
Therefore, the band-shaped electrode element MRG has three selections: (1) when the selected line is the line immediately above, (2) when it is the selected line, and (3) when the selected line is the line immediately below. During time, a gate pulse SCP needs to be applied. The selection is performed simultaneously for three lines, but the selection pulse is shifted for each line.
[0032]
In the case of simultaneous selection of three lines, it is necessary to bend electrons emitted from lines above and below the selected line toward the selected line. For this reason, the selection pulse SCP is applied to the cathode selection electrode CSG during the selection time of (1) above the selection line and (2) below the selection line for a selection time of two lines. . The selection is performed simultaneously for two lines, but this selection pulse is shifted for each line.
[0033]
According to this embodiment, the brightness of the phosphor can be improved by greatly increasing the amount of electrons that excite the unit phosphor, and a bright display can be obtained. Further, even if there is a difference between the electron emission capabilities of the plurality of electron sources K1, K2, and K3, this can be averaged, and the occurrence of display unevenness due to the difference in electron emission between the individual electron sources can be suppressed. An image display can be obtained.
[0034]
FIG. 6 is an explanatory diagram of the configuration and operation of the display device according to the second embodiment of the present invention. In this embodiment, four electron sources K1, K2, K3, and K4 included in one cathode line CL included in the rear panel PN1 correspond to one unit phosphor included in the front panel PN2. That is, the phosphor of the unit pixel constituting one color pixel is excited by the electrons E extracted from the four electron sources K1, K2, K3, and K4.
[0035]
Here, the unit phosphors R, G, and B are located on positions where the four electron sources K1, K2, K3, and K4 are adjacent to each other. A focusing voltage is applied to a cathode selection electrode CSG provided near the front panel PN2 side of the strip-shaped electrode element MRG, and electrons from the four electron sources K1, K2, K3, and K4 are concentrated on one unit phosphor G. . In FIG. 6, the on-state electrode (MRG1, MRG2, MRG3, MRG4) is simultaneously selected and an on-voltage (+ potential) is applied, and the other on-off electrode elements are off. Similarly, an on-voltage (+ potential) is applied to the cathode selection electrodes CSG2, CSG3, and CSG4, and the cathode selection electrodes CSG1 and CSG5 at the ends are off.
[0036]
Therefore, the electrons from the electron source K1 pass between the cathode selection electrodes CSG1 and CSG2 to reach the unit phosphor G, and similarly, the electrons from the electron source K2 pass between the cathode selection electrodes CSG2 and CSG3, and The electrons from K3 pass between the cathode selection electrodes CSG3 and CSG4, and the electrons from the electron source K4 pass between the cathode selection electrodes CSG4 and CSG5 to reach the unit phosphor G, respectively. When electrons from each electron source pass between the cathode selection electrodes, they are bent in a direction to be focused on the unit phosphor G, respectively. As a result, the electrons E from the four electron sources K1, K2, K3, and K4 excite one unit phosphor G to emit light in a predetermined color.
[0037]
According to the present embodiment, the luminance of the phosphor can be improved by further increasing the amount of electrons for exciting the unit phosphor, and a bright display can be obtained. Further, even if there is a difference between the electron emission capacities of the plurality of electron sources K1, K2, K3, and K4, this can be averaged, and the occurrence of display unevenness due to the difference in electron emission between the individual electron sources can be suppressed. A quality image display can be obtained.
[0038]
In FIG. 6, an ON voltage (+ potential) is applied to the strip electrode elements MRG1, MRG2, MRG3, and MRG4, and the other strip electrode elements are OFF. Similarly, the ON voltage (+ potential) is applied to the cathode selection electrodes CSG2, CSG3 and CSG4, and the cathode selection electrodes CSG1 and CSG5 at the ends are turned off. Depending on the electrode structure, a plurality of on-voltage levels to be applied to the strip-shaped electrode elements constituting the control electrode may be required. That is, in order to focus electrons from many electron sources on a single pixel (one phosphor), it is necessary to bend the electrons from a farther electron source. Further, if the number of simultaneously driven cathode wirings is the same, it is necessary to bend the anode wiring closer to the cathode wiring. Therefore, a structure requiring a plurality of voltage levels includes a structure in which four or more lines are simultaneously driven and a structure in which the distance between the anode and the cathode selection electrode is large. Further, in practice, when the odd-numbered lines are simultaneously driven, five or more lines are used. When the even-numbered lines are simultaneously driven, four or more lines are used. In such a case, assuming that the required number of ON voltage levels is n and the number of simultaneously selected strip-shaped electrode elements is n1, an integer number of n / (n · 1/2) is required.
[0039]
For example, in the sixth embodiment, the strip-shaped electrode elements MRG1, MRG2, MRG3, MRG4 and the cathode selection electrodes CSG2, CSG3 and CSG4 can be driven as follows. That is, although the on-voltage is applied to the strip electrode elements MRG1, MRG2, MRG3, and MRG4, the on-voltage of level 1 is applied to the cathode selection electrodes CSG2 and CSG4, and the level 2 is applied to the cathode selection electrode CSG3. Is applied. At this time, assuming that the level 1 cathode selection electrode voltage is V1, the level 2 cathode selection electrode voltage is V2, and the unselected cathode selection electrode voltage is V0 (normally 0V), it is necessary that V2 ≧ V1> V0. is there. This is because the more the cathode corresponding to the strip-shaped electrode element located farther from the selected unit pixel (unit phosphor), the larger it is necessary to bend the electron beam, and the same relationship is obtained even when the number of voltage levels increases. To establish. When it is necessary to increase the above-mentioned voltage level, the same driving can be performed by increasing the number of cathode selection electrodes instead of increasing the number of levels.
[0040]
As a method of selecting the cathode selection electrode, a method of lowering the voltage of a non-selected strip electrode element with respect to the selected strip electrode element is also possible. In this case, only the voltage of the non-selected strip-shaped electrode elements (for example, the cathode selection electrodes CSG1 and CSG5 in FIG. 6) closest to the selected strip-shaped electrode element need be reduced. As described above, the position of the unit phosphor with respect to each cathode is a position directly facing the cathode when the number of simultaneously selected strip electrode elements is odd, but the number of simultaneously selected strip electrode elements is even. In this case, the position is shifted from the cathode by a half pitch in the unit phosphor array direction.
[0041]
According to the present embodiment, the luminance of the phosphor can be improved by further increasing the amount of electrons for exciting the unit phosphor, and a bright display can be obtained. Further, even if there is a difference between the electron emission capacities of the plurality of electron sources K1, K2, K3, and K4, the difference can be averaged. A quality image display can be obtained.
[0042]
FIGS. 7 and 8 are explanatory diagrams of the configuration and operation of the display device according to the third embodiment of the present invention. In the present embodiment, a converging electrode FCG for converging electrons extracted from each cathode is provided between the cathode selection electrode and the strip electrode element. FIG. 7 shows the simultaneous selection of the three strip-shaped electrode elements MRG described with reference to FIG. The case where it is used is shown. FIG. 8 shows the simultaneous selection of the four strip-shaped electrode elements MRG described in FIG. 6, and the extraction of the electrons extracted from the four electron sources K1, K2, K3, and K4 on the cathode wiring CL into a single unit phosphor. The case where it is used for the excitation of is shown.
[0043]
The focusing electrode FCG shown in FIGS. 7 and 8 may have the same electrode structure as the strip electrode element MRG, but may have another structure as long as it has a focusing action. As shown in FIG. 7, the electrons extracted from the strip-shaped electrode element MRG are focused before the cathode selection electrode CSG.
[0044]
According to the present embodiment, the electrons extracted from the electron source K can be effectively used to excite the phosphor PHS composed of the unit phosphors R, G, and B, and the electrons strike the cathode selection electrode CSG and become stray electrons. This can avoid a decrease in contrast caused by exciting the phosphor as unnecessary electrons.
[0045]
FIG. 9 is an explanatory diagram of the configuration and operation of the display device according to the fourth embodiment of the present invention. In this embodiment, the function of the cathode selection electrode in each of the above-described embodiments is realized by the voltage level applied to the strip electrode element constituting the control electrode. Therefore, this embodiment does not have a cathode selection electrode as an electrode structure. In FIG. 9, the driving in this case is basically the same as the description in FIG. 5, but here, (1) when the selected line is the line immediately above, (2) When the selected line is reached (at this time, since the electrons in the upper and lower lines need to be bent to the selected line side, the pulse width of the selection pulse SCP becomes large), (3) When the selected line is the line immediately below, A selection pulse pulse is applied during the selection time for the number of lines. This selection is performed simultaneously for three lines, but the selection pulse is shifted for each line.
[0046]
FIG. 10 is a schematic plan view in which a part of the front panel is cut away and the rear panel is viewed to show an example of a phosphor array included in the front panel constituting the display device of the present invention. FIG. 10 corresponds to the display device having the configuration described with reference to FIGS. On the inner surface of the display area AR of the front panel SUB2, unit phosphors R, G, B of three colors are arranged in a horizontal direction (x direction) with the phosphors R, G, B as one group. Each phosphor is provided with an anode (not shown) for attracting electrons emitted from the rear panel SUB1 side. On the three sides of the back substrate, the above-described cathode wiring lead line CL-T, the lead line MRG-T of the strip electrode element, and the cathode selection electrode lead line CSG-T are formed. The cathode selection electrode CSG is fixed to the back substrate SUB1 via the insulating material INS to be installed insulated from the strip electrode element. When the focusing electrode described with reference to FIG. 7 is provided, a lead line may be formed on the other side of the back substrate SUB1 other than the three sides.
[0047]
FIG. 11 is a schematic explanatory view of the entire configuration of the display device according to the present invention, and corresponds to the first and second embodiments of the present invention. 2A is an exploded perspective view, and FIG. 2B is a cross-sectional view taken along line AA ′ in FIG. It should be noted that the cathode wiring, the electron source, and other components are not shown in FIG. As shown in FIG. 11, the display device according to the present invention includes a rear panel PN1 having a cathode wiring CL, a strip electrode element MRG, and a cathode selection electrode CSG installed on the inner surface of a rear substrate SUB1, and R, A fluorescent screen on which G and B unit phosphors are arranged and a front panel PN1 provided with an anode are integrated with a sealing frame MFL. The same reference numerals as those in the above-described drawings correspond to the same functional portions. Opposing interiors of the back panel PN1 and the front panel PN2 sealed via the sealing frame MFL are kept in a vacuum.
[0048]
FIG. 12 is an external view of a television receiver as an example of an electronic device using the display device according to the present invention. The display section DSP of this television receiver is supported by a stand section STD, and the image display device according to the above-described embodiment of the present invention is mounted on the display section DSP. The depth of the display unit DSP is extremely thin, and the installation space may be small.
[0049]
【The invention's effect】
As described above, according to the present invention, the cathode selection electrode is provided between the anode provided on the front panel and the control electrode provided on the back panel, and the phosphor of one unit pixel is provided in parallel with the extending direction of the strip electrode element. By projecting electrons from a plurality of cathodes, the amount of electrons that excite the phosphor is greatly increased, enabling image display with sufficient brightness, and the electron source having cathode wiring. The display unevenness due to the variation in the electron emission ability is eliminated, and a high-quality display device can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a rear substrate for schematically explaining a first embodiment of a display device according to the present invention.
FIG. 2 is a main part plan view schematically illustrating another configuration example of the cathode selection electrode in FIG.
FIG. 3 is a main part plan view schematically illustrating still another configuration example of the cathode selection electrode in FIG. 1;
FIG. 4 is an explanatory diagram of a configuration and an operation of the display device according to the first example of the present invention.
FIG. 5 is a timing chart of driving pulses applied to the strip electrode element and the cathode selection electrode for explaining the operation of the display device according to the first embodiment of the present invention.
FIG. 6 is an explanatory diagram of a configuration and an operation of a display device according to a second example of the present invention.
FIG. 7 is an explanatory diagram of a configuration and an operation of a display device according to a third example of the present invention.
FIG. 8 is an explanatory diagram of another configuration and operation of the display device according to the third embodiment of the present invention.
FIG. 9 is an explanatory diagram of a configuration and an operation of a display device according to a fourth example of the present invention.
FIG. 10 is a schematic plan view in which a part of the front panel is cut away and a rear panel is viewed to show an example of a phosphor array included in the front panel constituting the display device of the present invention.
FIG. 11 is a schematic explanatory view of the entire configuration of a display device according to the present invention.
FIG. 12 is an external view of a television receiver as an example of an electronic apparatus using the display device according to the present invention.
FIG. 13 is a developed perspective view schematically illustrating a schematic configuration of a field emission display device.
14 is a schematic diagram illustrating a display operation of the display device shown in FIG.
[Explanation of symbols]
PN1: rear panel, PN2: front panel, SUB1: rear substrate, SUB2: front substrate, CL: cathode wiring, CL-T: cathode wiring extraction Line, MRG ... Strip electrode element constituting control electrode, MRG-T ... Control electrode lead wire, MFL ... Sealing frame, CSG ... Cathode selection electrode, FCG ... -Focusing electrode.

Claims (17)

A front substrate formed on the inner surface with a phosphor screen and an anode in which a plurality of unit phosphors are arranged in a predetermined repetition,
A large number of cathodes extending in one direction and juxtaposed in the other direction and configured by a plurality of cathode wirings having an electron source, intersecting the cathode in a non-contact manner at least in a display area, and extending in the other direction. A plurality of independent strip-shaped electrode elements having electron passing holes which are arranged side by side in the one direction and allow electrons from the cathode to pass to the front substrate side on the inner surface, and have a predetermined interval with the front substrate. An opposing back substrate,
A display device having a sealing frame that is interposed between the front substrate and the rear substrate around the display region and that holds the predetermined gap,
A display device comprising: a cathode selection electrode for exciting one of the unit phosphors on the front substrate with electrons generated from the plurality of cathodes. The cathode selection electrode extends in a direction parallel to an extending direction of the strip-shaped electrode element, and includes a plurality of electrodes arranged in parallel in a direction crossing the extending direction of the strip-shaped electrode element. The display device according to claim 1. The display device according to claim 2, wherein the cathode selection electrode is a plate-like electrode. The display device according to claim 2, wherein the cathode selection electrode is a linear electrode. The display device according to claim 2, wherein the cathode selection electrode is disposed closer to the cathode than the anode. The number of cathodes selected to generate electrons for exciting one of the unit phosphors is odd, and the unit phosphor on the front substrate is disposed at a position facing the center cathode of the odd number of cathodes. The display device according to claim 1, wherein: The number of cathodes selected to generate electrons for exciting one of the unit phosphors is even, and the unit phosphors on the front substrate are arranged at positions facing each other between the cathodes. The display device according to claim 1, wherein: The display device according to claim 1, wherein the number of cathodes in the one direction is larger than the number of unit phosphors. The display device according to claim 1, wherein the number of cathodes in the one direction is larger than the number of the cathode selection electrodes. 10. The display according to claim 8, wherein a potential difference between adjacent ones of the plurality of cathode selection electrodes from which the plurality of cathodes are selected is large at an end side of the selected plurality of cathode selection electrodes. apparatus. A front substrate formed on the inner surface with a phosphor screen and an anode in which a plurality of unit phosphors are arranged in a predetermined repetition,
A plurality of cathodes extending in one direction and juxtaposed in the other direction and having a plurality of cathode wirings having an electron source are provided on the inner surface, intersect with the cathodes in a non-contact manner at least in a display area, and The front substrate has a plurality of independent band-shaped electrode elements having electron passing holes that extend in the other direction and are arranged in parallel in the one direction and allow electrons from the cathode to pass to the front substrate side. A back substrate opposed to at an interval,
A display device having a sealing frame that is interposed between the front substrate and the rear substrate around the display region and that holds the predetermined gap,
Between the strip-shaped electrode element and the anode, the strip-shaped electrode element is disposed so as to extend in the other direction, and generates one of the unit phosphors on the front substrate from the plurality of the cathodes. A display device comprising a cathode selection electrode for exciting with electrons. The cathode selection electrode extends in a direction parallel to an extending direction of the strip-shaped electrode element, and includes a plurality of electrodes arranged in parallel in a direction intersecting the extending direction of the cathode wiring. The display device according to claim 11. The display device according to claim 12, wherein the cathode selection electrode is a plate-like electrode. The display device according to claim 12, wherein the cathode selection electrode is a linear electrode. 15. The display device according to claim 12, wherein the cathode selection electrode is arranged closer to the cathode than the anode. The number of cathodes selected to generate electrons for exciting one of the unit phosphors is odd, and the unit phosphor on the front substrate is disposed at a position facing the center cathode of the odd number of cathodes. The display device according to any one of claims 11 to 15, wherein: The number of cathodes selected to generate electrons for exciting one of the unit phosphors is even, and the unit phosphors on the front substrate are arranged at positions facing each other between the cathodes. The display device according to claim 11, wherein:

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