TWI415157B - Field emission cathode device and field emission display - Google Patents

Abstract

The invention relates to an field emission cathode device. The field emission cathode device includes an insulated substrate, a plurality of linear cathodes, a plurality of insulation layers, a plurality of linear gate grids, a plurality of field emission cells, a plurality of fixed layers. The field emission cells are located on the intersection defined by the linear cathode and the linear gate grid. The field emission cells are electrically connect to the linear cathodes. The plurality of fixed layers is located on the surface of the linear gate grid and corresponding to the insulation layer. The linear gate grid is sandwiched by the insulation layer and the fixed layer. The plurality of fixed layers are located between the linear cathodes and are spaced apart from the linear cathodes. The field emission cathode device further meets the following conditions: D1 is equal to or less than a tenth of D2, wherein, the D1 is defined as an width of the insulation layer, D2 is defined as a distance between the centerlines of the two adjacent field emission cells. The invention also relates to a field emission display comprising the above-described field emission cathode device.

Description

Field emission cathode device and field emission display

The invention relates to a field emission cathode device and a field emission display.

Field emission displays are the next generation of emerging technologies with the most potential after cathode ray tube (CRT) displays and liquid crystal (LCD) displays. Compared with the previous display, the field emission display has the advantages of good display effect, large viewing angle, low power consumption and small volume, and has received more and more attention in recent years.

In general, the structure of a field emission display can be divided into a two-pole type and a three-pole type. The so-called two-pole type includes a field emission device having an anode and a cathode. This structure is difficult to control due to the application of a high voltage, and uniformity and electron emission are difficult to control. It is only suitable for character display, and is not suitable for graphic and image display. The triode type is a field emission device that increases the grid to control the electron emission based on the dipole field emission device, and can emit electrons under a lower voltage condition, and the electron emission is easily controlled by the grid. Therefore, in a three-pole field emission display, such a field emission cathode device composed of a cathode for generating electrons and a grid for extracting electrons and accelerating electrons has become a field emission cathode device which is currently more commonly used.

Referring to FIG. 1 and FIG. 2, a prior art field emission cathode device 100 is provided, which includes: an insulating substrate 102; a plurality of strip cathode electrodes 104, the plurality of strip cathodes The electrodes 104 are disposed in parallel and spaced apart from the surface of the insulating substrate 102; the plurality of field emission elements 106 are spaced apart from the surface of the plurality of strip-shaped cathode electrodes 104; the plurality of dielectric strips 108 are parallel and spaced apart The plurality of dielectric strips 108 are perpendicular to the plurality of strip-shaped cathode electrodes 104. The plurality of dielectric strips 108 cover a portion of the plurality of strip-shaped cathode electrodes 104 and are disposed relative to each of the field-emitting elements 106. There are through holes; a plurality of strip grids 110 are supported by the dielectric strips 108, and the plurality of strip grids 110 are perpendicular to the strip cathode electrodes 104. A fixed layer 113 is disposed above the strip grid 110 away from the dielectric strip 108. Since the material of the grid 110 is mostly metal, and the material of the dielectric strip 108 is mostly an insulating material, the bonding between the grid 110 and the dielectric strip 108 is not strong. The fixed layer 113 is used to fix the grid 110 so that the grid 110 is not easily deformed.

During application of the field emission cathode device 100, the field emission element 106 emits electrons at a voltage of the grid 110 that passes through the grid 110. Since the fixed layer 113 covers a portion of the cathode 104, and the fixed layer 113 only has a through hole corresponding to the position of the field emission element 106. Therefore, the edge of the pinned layer 113 is very close to the edge of the field emission element 106. The electrons passing through the grid 110 are attracted by the voltage of the grid 110 close to the fixed layer 113 and then hit the fixed layer 113. The fixed layer 113 emits a large amount of secondary electrons under the impact of electrons. The part of the secondary electron system is emitted by the fixed layer 113, and its direction is disordered, which leads to the phenomenon that the pixel point boundary is divergent and presents an irregular pattern. After the secondary layer 113 emits secondary electrons, the charge gradually forms a high potential, thereby further attracting electrons passing through the grid 110, causing the electrons to deviate from the direction perpendicular to the cathode electrode 104. Referring to FIG. 3, the pixel boundary of the field emission display of the field emission cathode device 100 is diverged to exhibit an irregular pattern.

In view of this, it is necessary to provide a field emission cathode device and a field emission display capable of obtaining clear pixels in an operational state.

A field emission cathode device comprising: an insulating substrate; a plurality of strip cathodes are parallel to each other and equally spaced on a surface of the insulating substrate; a plurality of spacers are spaced apart from a surface of the insulating substrate; the plurality of strip grids are parallel to each other At equal intervals, the plurality of strip grids are perpendicular to and intersect with the plurality of strip cathodes, and each strip grid is supported by the separator and spaced apart from the strip cathode; the plurality of field emission elements are respectively disposed And intersecting the plurality of strip-shaped cathodes with the plurality of strip-shaped grids and electrically connecting to the strip-shaped cathodes; the plurality of fixed layers respectively corresponding to the plurality of spacers disposed on the surface of the strip-shaped grid, a strip grid is sandwiched between the fixed layer and the separator, the plurality of separators are respectively located between the plurality of strip cathodes and spaced apart from the strip cathode, and the field emission cathode device further satisfies The following condition: D1 is less than or equal to D2/10, wherein the width of the spacer is defined as D1, and the distance between the center lines of adjacent two field emission elements is defined as D2.

A field emission display comprising an anode device and a field emission cathode device spaced apart from the anode device, the field emission cathode device comprising: an insulating substrate; the plurality of strip cathodes being parallel to each other and equally spaced on the surface of the insulating substrate a plurality of spacers are disposed on the surface of the insulating substrate; the plurality of strip grids are parallel to each other and equally spaced, and are perpendicular to the plurality of strip cathodes, and each strip grid is supported by the spacers a strip-shaped cathode spacing arrangement; a plurality of field emission elements respectively disposed at intersections of the plurality of strip cathodes and the plurality of strip grids and electrically connected to the strip cathodes; the plurality of fixed layers respectively corresponding to the plurality of Isolator setting And clamping the grid between the fixed layer and the separator on the surface of the grid, wherein the plurality of spacers are respectively located between the plurality of strip cathodes and spaced apart from the strip cathode, the isolation The arrangement of the body further satisfies the following condition: D1 is less than or equal to D2/10, wherein the width of the spacer is defined as D1, and the distance between the center lines of adjacent two field emission elements is defined as D2.

Compared with the prior art, the width of the spacer used in the field emission cathode device and the field emission display provided by the present invention is less than one tenth of the distance between the center lines of adjacent two field emission elements, and therefore, the spacer The width is much smaller than the distance between the centerlines of adjacent two field emission elements, and further, the width of the fixed layer above the spacer is much smaller than the distance between the centerlines of the adjacent two field emission elements. Therefore, when a voltage is applied to the grid, the probability of electrons emitted by the field emission element hitting the fixed layer can be effectively reduced. Thereby reducing the charging effect of the fixed layer, and then the electrons emitted by the field emission element fly in a direction perpendicular to the surface of the field emission element without deflecting to the fixed layer, which can effectively eliminate the pixel point boundary divergence and exhibit irregular patterns when applied. The phenomenon.

10, 100, 202‧‧ ‧ field emission cathode device

12, 102, 204, 214‧‧ ‧ insulating substrate

14, 104, 206‧‧‧ cathode electrode

16, 106, 222‧‧ ‧ field emission components

18, 108, 208‧‧ ‧ Isolation

20, 110, 210‧‧‧ grid

22, 224, 113‧‧‧ fixed layer

24, 226‧‧‧ conductive layer

121‧‧‧The first surface of the insulating substrate

122‧‧‧Second surface of the insulating substrate

162, 222‧‧‧ electron emitters

200‧‧ ‧ field emission display

216‧‧‧Transparent anode

218‧‧‧Fluorescent layer

212‧‧‧Anode device

222‧‧‧Insulation support

1 is a top plan view of a field emission cathode device of the prior art.

Figure 2 is a cross-sectional view of the field emission cathode device of Figure 1 taken along line II-II.

Fig. 3 is a view showing the display effect of the field emission display in the prior art.

4 is a schematic perspective view showing a field emission cathode device according to a first embodiment of the present invention.

Figure 5 is a cross-sectional view of the field emission cathode device of Figure 4 taken along line V-V.

Figure 6 is a plan view of a field emission cathode device according to a first embodiment of the present invention.

Figure 7 is a top plan view of a field emission cathode device according to a second embodiment of the present invention.

Figure 8 is a top plan view of a field emission cathode device according to a third embodiment of the present invention.

9 is a cross-sectional view of a field emission display employing a field emission cathode device according to an embodiment of the present invention.

Fig. 10 is a view showing the display effect of the field emission display of Fig. 9.

The field emission cathode device and the field emission display provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 4 and FIG. 5, a first embodiment of the present invention provides a field emission cathode device 10 including: an insulating substrate 12, a plurality of strip cathodes 14, a plurality of field emission elements 16, a plurality of spacers 18, and a plurality of strips. The grid 20, the plurality of fixed layers 22, and the plurality of conductive layers 24. The plurality of strip cathodes 14 are disposed parallel to each other and equally spaced on the surface of the insulating substrate 12. The plurality of spacers 18 are spaced apart from the surface of the insulating substrate 12 and disposed between the plurality of strip cathodes 14. The plurality of separators 18 are spaced apart from the strip cathodes 14. The plurality of strip grids 20 are arranged parallel to each other and equally spaced, and are disposed perpendicular to and perpendicular to the strip cathodes 14. Each of the strip grids 20 is supported by a plurality of spacers 18. The plurality of field emission elements 16 are respectively disposed at intersections of the plurality of strip cathodes 14 and the plurality of strip grids 20 and are electrically connected to the strip cathodes 14. The plurality of fixed layers 22 are respectively disposed on the surface of the grid 20 corresponding to the plurality of spacers 18, and the grid 20 is clamped and fixed between the fixed layer 22 and the separator 18. The plurality of conductive layers 24 are respectively disposed on the surface of the plurality of fixed layers 22 away from the grid 20 .

The material of the insulating substrate 12 is an insulating material such as glass, ceramic or cerium oxide. In this embodiment, the insulating substrate 12 is made of glass. The insulating substrate 12 is configured to carry the plurality of strip cathodes 14, the plurality of field emission elements 16, the plurality of spacers 18, and the plurality of strip grids 20. The insulating substrate 12 includes a first surface 121 and a second surface 122 opposite the first surface 121. A first direction X and a second direction Y perpendicular to each other are defined on the first surface 121 of the insulating substrate 12. The first direction X and the second direction Y are both parallel to the first surface 121.

Each of the plurality of strip-shaped cathodes 14 has an elongated strip shape or a strip shape, and the plurality of strip-shaped cathodes 14 are disposed at equal intervals and spaced apart from each other on the first surface 121 of the insulating substrate 12. Each strip cathode 14 is parallel to the first direction X. The material of the plurality of strip cathodes 14 may be selected from a metal such as copper, aluminum, gold or silver, or a conductive material such as indium tin oxide (ITO). In this embodiment, each strip cathode 14 is a silver electrode.

Each of the plurality of strip-shaped grids 20 has an elongated strip shape or a strip shape, and the plurality of strip-shaped grids 20 are disposed parallel to each other and equally spaced apart. Preferably, the spacing between the plurality of strip grids 20 is equal to the spacing between the plurality of strip cathodes 14. The plurality of strip grids 20 are perpendicular to and perpendicular to the plurality of strip cathodes 14. In the mutually intersecting positions, the strip grid 20 and the strip cathode 14 have a pitch in the direction perpendicular to the first surface 121 of 18 μm or more. The strip grid 20 is a mesh structure comprising a plurality of uniformly distributed gate holes having a pore size of from 3 micrometers to 1000 micrometers. Preferably, the strip grid 20 is a metal mesh. In this embodiment, the strip grid 20 is a stainless steel mesh, and the strip grid 20 is The spacing between the plurality of strip cathodes 14 is 20 microns.

The plurality of field emission elements 16 are spaced apart from each other across a surface of the plurality of strip cathodes 14 away from the insulating substrate 12. Preferably, the plurality of field emission elements 16 are arranged in a matrix. The field emission element 16 may be disposed only at an intersection of the strip cathode 13 and the strip grid 20. Those skilled in the art will appreciate that the field emission element 16 can also be disposed on the surface of the entire strip cathode 14. Each field of radiating elements 16 includes a plurality of electron emitters 162, each of which may be selected as a metal microtip, a tip, a carbon nanotube, or other electron emitter. The electron emitter 162 in the field emission element 16 can be a carbon nanotube array, a nano carbon pipeline, a carbon nanotube slurry, or a carbon nanotube membrane. In this embodiment, the field emission element 16 is an array of carbon nanotubes.

The plurality of spacers 18 are used to support the grid 20. The grid 20 and the strip cathode 14 are spaced apart from each other by a distance from the first surface 121 and insulated from each other by the plurality of separators 18. The plurality of spacers 18 are disposed only on the first surface 121 of the insulating substrate 12 between the strip cathodes 14. The separator 18 is spaced apart from the strip cathode 14. Preferably, the separator 18 is strip-shaped and disposed parallel to the strip cathode 14. Each of the spacers 18 is equidistant from the distance between the two cathodes 14 adjacent thereto. Each of the spacers 18 is equidistant from the distance between the two field emission elements 16 adjacent thereto.

The material of the separator 18 is an insulating material such as glass, ceramic or cerium oxide. In this embodiment, each of the plurality of spacers 18 is a rectangular parallelepiped having a length, a width, and a height. The length direction of each of the spacers 18 is parallel to the first direction X. The width direction of each of the separators 18 is parallel to the second direction Y. The height direction of each of the spacers 18 is perpendicular to the first surface 121 of the insulating substrate 12. this In the embodiment, in the first direction X, a plurality of spacers 18 are disposed between adjacent two cathodes 14 to support each of the strip grids 20, respectively.

Referring to FIG. 6, in order to reduce the influence of the charging effect, the field emission cathode device 10 further satisfies the following conditions:

(1) D1 is less than or equal to D2/10, wherein the width of the spacer 18 is defined as D1, and the distance between the center lines of the adjacent two field emission elements 16 is defined as D2.

(2) D3/D2 is greater than or equal to 0.125 and D3/D2 is less than or equal to 0.48, wherein the radial dimension of the field emission element 16 is defined as D3.

(3) H is greater than or equal to 5 μm and H is less than or equal to 100 μm; wherein the height of the separator 18 is defined as H.

The conditional expression (1) defines the relationship between the width D1 of the separator 18 in the Y direction and the distance D2 between the adjacent two field emission elements 16. Under the condition that the distance D2 between the center lines of the adjacent two field emission elements 16 is constant, the width of the spacer 18 is less than one tenth of D2, and therefore, the width of the spacer 18 is small, further located in the spacer 18. The width of the fixed layer 22 above is also small. The width of the surface of the fixed layer 22 remote from the grid 20 is also small, and the area of the surface of the fixed layer 22 remote from the grid 20 is also small. Therefore, after the electrons emitted from the field emission element 16 pass through the grid 20, the probability of electrons hitting the surface of the fixed layer 22 away from the grid 20 can be reduced, thereby effectively reducing the charging effect. Generally D2 is less than or equal to 5 mm. Alternatively, the range of D2 is greater than or equal to 3 mm and less than or equal to 5 mm. D1 is less than or equal to 500 microns and greater than or equal to 100 microns. Preferably, D1 ranges from 200 microns to 400 microns. The width of the spacer 18 is such that it can support the grid 20 and keep the grid 20 from deforming. In this embodiment, the D2 is 1.5 mm. D1 is 300 microns.

Conditional expression (2) limits the radial dimension of field emission element 16, in particular the size of field emission element 16 in the Y direction. Further, the distance D4 between the separator 18 and the field emission element 16 can be made larger. That is, the distance between the edge of the spacer 18 and the edge of the field emission element 16 is large. D4 is greater than or equal to 150 microns. Alternatively, D4 is 200 microns. Further, the distance between the edge of the pinned layer 22 and the edge of the field emission element 16 is also large, and therefore, the electrons emitted from the field emission element 16 can be further reduced, and the probability of hitting the pinned layer 22 can be further reduced, thereby further reducing the charging effect. D3 is less than or equal to 2400 microns. Preferably, D3 is greater than or equal to 500 microns and less than or equal to 1300 microns. Alternatively, D3 is 1000 microns. In this embodiment, D3 is 400 microns and D4 is 250 microns.

The conditional expression (3) defines that the height H of the separator 18 is 5 μm or more and 100 μm or less. Preferably, the height H of the separator 18 is greater than or equal to 10 micrometers and less than or equal to 15 micrometers. In the present invention, the height of the spacer 18 is low, and the height of the grid 20 is low. The grid 20 can extract electrons from the field emission element only by applying a lower voltage. The voltage of the grid 20 is small, and thus the attraction of the electrons emitted from the field emission element 16 of the grid 20 near the fixed layer 22 is also small. Further, the electrons emitted from the field emission element 16 are not easily near the fixed layer 22. The voltage of the grid 20 hits the surface of the fixed layer 22, which further reduces the charging effect.

Those skilled in the art can understand that the conditional formulas (2) and (3) are optional, and are not necessary technical features of the present invention, and those skilled in the art can adjust according to different application scenarios of the field emission cathode device 10.

The plurality of fixed layers 22 are respectively disposed corresponding to the plurality of spacers 18, and the plurality of strips are arranged 20 is fixed between the separator 18 and the fixed layer 22. The pinned layer 22 covers only the surface of the area of the grid 20 above the separator 18. A grid 20 is disposed between the fixed layer 22 and the separator 18. In this way, the grid 20 is not easily deformed due to deformation, and the spacing between the grid 20 and the strip cathode 14 is not uniform, thereby affecting the uniform emission of electrons by the field emission cathode device 10. Therefore, the field emission cathode device 10 has a stable structure and is not easily affected by the external environment.

The pinned layer 22 fills the gate holes of the grid 20 above the separator 18. The fixed layer 22 is bonded to the separator 18 through the gate holes of the grid 20, thereby fixing the grid 20. The material of the pinned layer 22 may be an insulating medium such as glass, ceramic or cerium oxide. Preferably, the material of the fixing layer 22 is the same as that of the separator 18, so that the fixing layer 22 and the separator 18 are better compatible and firmly bonded, thereby firmly fixing the grid 20. Generally, the fixing layer 22 can be prepared by a screen printing method. During the preparation process, the fixing layer 22 penetrates into the gate hole of the grid 20 and contacts the separator 18 to realize more. Well fixed. The thickness of the non-gate hole region of the fixed layer 22 corresponding to the grid 20 is extremely small, usually less than or equal to 10 micrometers, and the fixed layer 22 does not affect the electrical connection between the conductive layer 24 and the grid 20.

The material of the conductive layer 24 may be metal, alloy, indium tin oxide, antimony tin oxide, conductive silver paste, conductive polymer or carbon nanotube. In this embodiment, the material of the conductive layer 24 is a silver paste. Conductive layer 24 is prepared on fixed layer 22 by screen printing. In the preparation process, the conductive layer 24 is a fluid silver paste, and therefore, the silver paste easily flows along the sidewalls of the fixed layer 22, the grid 20, and the separator 18 to the insulating substrate 12. Since the separator 18 and the strip cathode 14 are spaced apart and kept at a certain distance, the cathode 14 and the grid 20 are prevented from being short-circuited. The conductive layer 24 is of an alternative construction.

The conductive layer 24 covers the surface of the fixed layer 22 away from the grid 20, thereby reducing the area of the secondary layer that can generate secondary electrons. The conductive layer 24 may also derive a portion of the electron emitter 162 that is emitted onto the conductive layer 24 to reduce or prevent the portion of electrons from bombarding the spacer 18 to generate secondary electrons. In addition, a small portion of electrons emitted by the electron emitter 162 directly bombards the separator 18 such that the separator 18 emits secondary electrons and generates a positive charge on the separator 18, and the positive charge can pass through The conductive layer 24 and the grid 20 are guided away to reduce or avoid the accumulation of positive charges on the separator 18, so that the potential around the separator 18 is substantially unchanged, thereby reducing the electrons emitted by the electron emitter 162 from diverging around. The possibility is that the electrons are concentrated to a predetermined position, so that the image of the field emission display using the field emission cathode device 10 is clear and the display effect is good. The conductive layer 24 is of an alternative construction.

The field emission cathode device 10 applies different voltages to the cathode 14 and the grid 20, respectively, when applied. In general, the cathode 14 is grounded or zero voltage, and the voltage of the grid 20 is about several tens of volts to several hundreds of volts. The electrons emitted by the electron emitters 162 in the field emission element 16 on the cathode 14 move in the direction of the grid 20 by the electric field of the grid 20, and are emitted through the gate holes of the grid 20. Since the plurality of cathodes 14 are insulated from each other and the plurality of grids 20 are insulated from each other, different positions can be controlled by selectively applying different voltages between certain cathodes 14 and certain grids 20 The field emission element 16 emits electrons to effect the addressing function of the field emission cathode device 10 to meet its application in a field emission display.

A second embodiment of the present invention provides a field emission cathode device. Referring to FIG. 7, the structure of the field emission cathode device and the structure of the field emission cathode device 10 in the first embodiment. Similarly, the difference is that, when the separator 18 is disposed between the strip cathodes 14, in the first direction X, only one separator 18 is disposed between the adjacent two cathodes 14 while supporting the plurality of strips. Grid 20. When only one spacer 18 is disposed between the adjacent two cathodes 14 while supporting the plurality of strips 20, the fixed layer 22 may be disposed only corresponding to the spacer 18 at the support grid 20, It can be disposed on the entire surface of the separator 18.

A third embodiment of the present invention provides a field emission cathode device. The structure of the field emission cathode device is similar to that of the field emission cathode device 10 of the first embodiment, except that the separator does not need to be disposed between any two adjacent strip cathodes, ensuring the isolation. The physical energy provides sufficient support for the strip grid, and a spacer may be disposed in each of the N strip-shaped cathode or field emission elements in the second direction Y, where N is an integer greater than one. The smaller the number of the separators, the smaller the area of the fixed layer above the separator, and the lower the probability that the fixed layer will have a charging effect. For example, referring to FIG. 8, along the second direction Y, a spacer 18 may be disposed for each of the three field emission elements 16. The minimum number of the plurality of separators 18 is not limited. The number of the spacers 18 should be as small as possible while ensuring that the grid 20 is not deformed.

Referring to FIG. 9, the present invention further provides a field emission display 200 using the field emission cathode device 10, the field emission display 200 including an anode device 212 and a field emission cathode device 202 spaced from the anode device 212. The anode device 212 is disposed opposite the field emission cathode device 202 and spaced apart by a distance. The field emission cathode device 202 can employ the field emission cathode device 10 of the first embodiment.

The field emission cathode device 202 includes an insulating substrate 204, a plurality of strip cathodes 206, The plurality of field emission elements 222, the plurality of spacers 208, the plurality of strip grids 210, a fixed layer 224, and a conductive layer 226. The anode device 212 is disposed at a distance from the strip grid 210 in the field emission cathode device 202.

The anode device 212 includes a glass substrate 214, a transparent anode 216, and a plurality of phosphor layers 218 coated on the transparent anode 216. The transparent anode 216 can be an indium tin oxide film. The anode device 212 is spaced apart from the insulating substrate 204 in the field emission cathode device 202 by an insulating support 220, and the anode device 212 is sealed from the edge of the field emission cathode device 202 such that the field emission cathode device 202 and the anode device 212 are A vacuum environment is formed between them. The field emission elements 222 in the field emission cathode device 202 are disposed in one-to-one correspondence with the phosphor layers 218 in the anode device 212 to form a pixel unit.

The field emission display 200 applies different voltages to the strip cathode 206, the strip grid 210, and the anode 216, respectively, when applied. The electrons emitted by the electron emitters in the field emission element 222 of the cathode 206 move in the direction of the grid 210 under the electric field of the grid 210, and are emitted through the gate holes of the grid 210, under the electric field of the anode 216. Eventually, the anode 216 is struck, and the phosphor layer 218 coated on the transparent anode 216 is fired to realize the display function of the field emission display 200. Since the strip cathodes 206 are insulated from each other and the strip grids 210 are insulated from each other, different positions can be controlled by selectively applying different voltages between the different strip cathodes 206 and the strip grids 210. The field emission elements 222 emit electrons that are struck at different locations on the phosphor layer 218 of the anode device 212, thereby causing different locations of the phosphor layer 218 to illuminate, causing the field emission display 200 to display different pictures as desired.

The field emission cathode device and the spacer used in the field emission display provided by the invention The width is less than one tenth of the distance between the center lines of the adjacent two field emission elements, and therefore, the width of the spacer is much smaller than the distance between the center lines of the adjacent two field emission elements, and further, is located in the spacer The width of the upper fixed layer is much smaller than the distance between the center lines of the adjacent two field emission elements. Therefore, when a voltage is applied to the grid, the probability of electrons emitted by the field emission element hitting the fixed layer can be effectively reduced. Thereby reducing the charging effect of the fixed layer, and then the electrons emitted by the field emission element fly in a direction perpendicular to the surface of the field emission element without deflecting to the fixed layer, which can effectively eliminate the pixel point boundary divergence and exhibit irregular patterns when applied. The phenomenon.

Further, the ratio of the radial dimension of the field emission element to the distance between the center lines of the adjacent two field emission elements ranges from 0.125 to 0.48, and therefore, the distance between the spacer and the field emission element is large. Further, the distance between the fixed layer and the field emission element is also large, so that the probability of electrons emitted from the field emission element hitting the fixed layer can be effectively reduced. Thereby reducing the charging effect of the fixed layer.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧ Field emission cathode device

12‧‧‧Insulation base

14‧‧‧Cathode electrode

16‧‧‧ Field emission components

18‧‧‧Isolation

20‧‧‧ grid

22‧‧‧Fixed layer

24‧‧‧ Conductive layer

121‧‧‧The first surface of the insulating substrate

122‧‧‧Second surface of the insulating substrate

Claims (14)

A field emission cathode device comprising: an insulating substrate; a plurality of strip cathodes are parallel to each other and equally spaced on a surface of the insulating substrate; a plurality of spacers are spaced apart from a surface of the insulating substrate; the plurality of strip grids are parallel to each other Arranged at equal intervals, the plurality of strip grids are perpendicular to and intersect with the plurality of strip cathodes, and each of the strip grids is supported by the separator and spaced apart from the strip cathode; Transmitting elements respectively disposed at intersections of the plurality of strip cathodes and the plurality of strip grids and electrically connected to the strip cathodes; a plurality of fixed layers respectively corresponding to the plurality of spacers disposed on the strip grid a mesh surface sandwiching the strip grid between the fixed layer and the separator, wherein the plurality of separators are respectively located between the plurality of strip cathodes and spaced apart from the strip cathode It is provided that the field emission cathode device satisfies the condition that D1 is less than or equal to D2/10, wherein the width of the spacer is defined as D1, and the distance between the center lines of adjacent two field emission elements is defined as D 2. The field emission cathode device of claim 1, wherein D2 is less than or equal to 5 mm. The field emission cathode device according to claim 1, wherein D1 is 500 μm or less and 100 μm or more. The field emission cathode device of claim 1, wherein the field emission cathode device further satisfies the following condition: D3/D2 is greater than or equal to 0.125 and D3/D2 is less than or equal to 0.48, wherein a radial dimension of the field emission element Defined as D3. The field emission cathode device according to claim 4, wherein a distance between the separator and the field emission element is 150 μm or more. The field emission cathode device according to claim 1, wherein the field emission cathode device further satisfies the following condition: H is greater than or equal to 5 μm and H is less than or equal to 100 μm; wherein the height of the separator is defined as H. The field emission cathode device of claim 1, wherein each of the plurality of spacers is equidistant from a distance between two adjacent field emission elements. The field emission cathode device according to claim 1, wherein, in a direction parallel to the strip cathode, only one of the spacers is disposed between adjacent two cathodes, and the spacer supports the plurality of strips Grid. The field emission cathode device of claim 1, wherein the plurality of spacers are disposed between adjacent two cathodes in a direction parallel to the strip cathode, each of the spacers supporting Strip grid. A field emission cathode device according to claim 1, wherein a spacer is provided for each of said strip cathodes in a direction parallel to said strip grid. The field emission cathode device of claim 1, wherein the pinned layer fills a gate hole of the strip grid above the separator, and is combined with the separator to form the strip A grid is fixed between the separator and the fixed layer. The field emission cathode device of claim 11, wherein the fixed layer corresponds to a thickness of the non-gate hole region of the grid of 10 μm or less. The field emission cathode device of claim 1, further comprising a plurality of conductive layers respectively disposed on a surface of the plurality of fixed layers away from the strip grid. A field emission display, comprising an anode device and a field emission cathode device according to any one of claims 1 to 13, the field emission cathode device and the anode Device interval setting.