JP2001216925A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device that has improved luminescent efficiency of a phosphor and increased brightness. SOLUTION: A phosphor formation part 1008 of one-pixel area which constitutes a phosphor screen is made concave-shaped so that it may have a larger surface area than the projected area observed from the side of a substrate 1001.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device using an electron beam for irradiating a phosphor screen with an electron beam, for example, a field emission display (FE).
D), a cathode ray tube (CRT) and the like.

[0002]

2. Description of the Related Art Image display devices such as CRTs are:
Research is being actively pursued for even larger sizes. In addition, with the increase in size, reduction in thickness, weight, and cost of the device has become an important issue.

However, a CRT deflects electrons accelerated by a high voltage with a deflecting electrode and excites a phosphor on a face plate. Difficult to provide. The inventors have been researching a surface conduction electron-emitting device and an image display device using the surface conduction electron-emitting device as an image display device that can solve the above problem.

The inventors have attempted to apply a multi-electron beam source by, for example, an electrical wiring method shown in FIG. That is, it is a multi-electron beam source in which a large number of surface conduction emission devices are two-dimensionally arranged, and these devices are wired in a simple matrix as shown in the figure (field emission display (FED)).

[0005] In the drawing, reference numeral 4001 schematically shows a surface conduction electron-emitting device, 4002 is a row-direction wiring, and 4003 is a column-direction wiring. For convenience of illustration, the matrix is shown as a 6 × 6 matrix, but the size of the matrix is not limited to this, and elements sufficient for displaying a desired image are arranged and wired.

FIG. 10 shows a structure of a cathode ray tube using this multi-electron beam source. An outer container bottom 4005 (also referred to as a rear plate) having a multi-electron beam source 4004 and an outer container frame 4007 are provided. , Phosphor layer 4008
Plate 4006 with metal back 4
009. In addition, metal back 40
09 to the high-voltage power supply 401 through the high-voltage introduction terminal 4011
A high pressure is applied by 0.

[0007] In a multi-electron beam source in which surface conduction electron-emitting devices are arranged in a simple matrix, an appropriate electric signal is applied to a row-direction wiring 4002 and a column-direction wiring 4003 in order to output a desired electron beam.

For example, to drive a surface conduction electron-emitting device of an arbitrary row in a matrix, a selection voltage Vs is applied to a row direction wiring 4002 of a selected row, and at the same time, a row direction of an unselected row is selected. A non-selection voltage Vns is applied to the wiring 4002.

In synchronization with this, a driving voltage Ve for outputting an electron beam is applied to the column wiring 4003. According to this method, the surface conduction electron-emitting devices of the selected row include:
A voltage of Ve-Vs is applied, and a voltage of Ve-Vns is applied to the surface conduction type emission elements in the non-selected rows.

If Ve, Vs, and Vns are set to appropriate voltages, electron beams of a desired intensity are output only from the surface conduction electron-emitting devices in the selected row, and different driving voltages Ve are applied to each of the column wirings. Is applied, electron beams having different intensities are output from each of the elements in the selected row.

Further, since the response speed of the surface conduction electron-emitting device is high, if the length of time for applying the drive voltage Ve is changed, the length of time for outputting the electron beam can be changed.

The electron beam output from the multi-electron beam source 4004 by the voltage application as described above
a is applied to the metal back 4009 to which
The phosphor as a target is excited to emit light. Therefore, for example, by appropriately applying a voltage signal corresponding to image information, an image display device can be obtained.

As described in "Phosphor Handbook" (edited by Phosphors Society of Japan, Ohmsha, published on June 20, 1991), the phosphor used for the face plate of the image display apparatus is referred to as "luminance saturation characteristic". (265-266)
page).

That is, when the current density of the electron beam applied to the phosphor increases, the luminous efficiency of the phosphor decreases, and the luminance is saturated even when the current density is increased.

[0015]

As described above, since the phosphor has the "luminance saturation characteristic", the following problems occur.

In the image display device, even if the current value of the electron beam is increased in order to obtain high luminance, if the current density increases, the luminous efficiency decreases due to the “luminance saturation characteristic”, and the luminance is increased as expected. Does not improve.

Further, it has been confirmed that the phosphor deteriorates according to the input charge amount (coulomb amount) per unit area. From this point, it is desired to reduce the current density. In particular, in a lateral electron-emitting device such as the above-mentioned surface conduction electron-emitting device or field emission device (FE), as shown in FIG. 11, the current density within one pixel irradiated with an electron beam has a large distribution. A major problem is that the life of the phosphor is shortened due to local degradation of the phosphor in a portion having the highest current density. The one pixel is, for example, a region corresponding to each color phosphor indicated by oblique lines between black matrices (shielding members) 1010 in FIG.

An object of the present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide an image display device in which the luminous efficiency of a phosphor is increased and the luminance is improved. .

It is another object of the present invention to provide an image display device capable of improving luminance and obtaining a stable image over a long period of time by suppressing local deterioration of a phosphor.

[0020]

According to the present invention, there is provided an image forming member on which a phosphor screen having a plurality of pixel regions is arranged, and a substrate on which a plurality of electron-emitting devices are arranged opposite to the phosphor screen. Wherein the electron-emitting device comprises: a low-potential-side electrode and a high-potential-side electrode provided side by side on the substrate; and an electron-emitting portion located between the two electrodes. Each of the regions has an inclined surface that is uniformly inclined in a certain direction (one direction).

Here, the inclined surface that is uniformly inclined in a certain direction (one direction) is defined as:
Having a somewhat uniform (ordered) slope, that is, having a rough surface and having a plurality of fine (irregular) irregularities, thereby excluding a case where the surface has a slope. For example, a case where the surface is inclined such as a part of a conical side surface or a case where the surface is inclined is included.

According to the present invention, there is provided an image forming member provided with a phosphor screen having a plurality of pixel regions, and a substrate provided opposed to the phosphor screen and provided with a plurality of electron-emitting devices. In the display device, the electron-emitting device includes a low-potential-side electrode and a high-potential-side electrode provided side by side on the substrate, and an electron-emitting portion located between the two electrodes, and each of the plurality of pixel regions is , And has a slope facing the center of the pixel region.

Further, in the above-described present invention, the electron-emitting device includes a high-potential-side electrode and a low-potential-side electrode juxtaposed on the substrate, and a conductive element having an electron-emitting portion disposed between the two electrodes. And a lateral field emission device including a low potential side emitter electrode and a high potential side gate electrode provided side by side with the substrate. It is.

According to the present invention, there is provided an image forming member provided with a phosphor screen having a plurality of pixel regions, and a substrate provided opposed to the phosphor screen and provided with a plurality of electron-emitting devices. In the display device, each of the plurality of pixel regions is formed in a concave shape, and has a slope facing the center thereof.

Further, in the present invention, it is preferable that the electron-emitting device includes a pair of electrodes arranged in parallel on the substrate and an electron-emitting portion located between the pair of electrodes. A surface conduction electron-emitting device including a pair of electrodes arranged side by side on the substrate and a conductive film having an electron emission portion disposed between the pair of electrodes, or an emitter electrode and a gate arranged side by side on the substrate It is preferable that the device is a horizontal field emission device including an electrode.

In the present invention described above, it is preferable that the inclination has an angle of 30 degrees or more and less than 90 degrees with respect to the substrate.

It is also preferable that the phosphors disposed in each of the plurality of pixel regions have different thicknesses in each of the pixel regions.

Preferably, the difference between the maximum value and the minimum value of the thickness of the phosphor is at least twice the average particle size of the phosphor particles constituting the phosphor.

It is also preferable that a shielding member is disposed between the plurality of pixel regions.

The present invention also provides an image display apparatus comprising: an image forming member having a phosphor screen divided into a plurality of pixel regions; and a substrate having means for emitting electrons to the phosphor screen. Each pixel region of the phosphor screen has a phosphor forming portion having a larger surface area than a projected area when viewed from the substrate side.

It is also preferable that the phosphor has a portion forming an angle of 30 degrees or more and less than 90 degrees with respect to the substrate.

It is preferable that each pixel region of the phosphor screen has a different thickness in the phosphor formed in one pixel region.

It is also preferable that the difference in film thickness between the thickest part and the thinnest part of the phosphor is at least twice the average particle diameter of the phosphor constituting the phosphor.

It is also preferable that the phosphor has a concave shape.

The image forming member is provided with a shielding member for dividing the phosphor screen into respective pixel areas. The shielding member is thicker than an average thickness of the phosphor of the phosphor screen. It is also preferable to cover the side wall surface with a phosphor.

It is also preferable that the shielding member has a substantially parallel surface portion facing the substrate and a side wall surface portion forming an angle of 30 degrees or more and less than 90 degrees, and the side wall surface portion is preferably covered with a phosphor.

It is also preferable that the shielding member has a black portion in contact with the image forming member and a white portion located thereon.

It is preferable that the phosphor has a plurality of convex portions.

It is also preferable that the phosphor screen is formed by a screen printing method.

The phosphor of the phosphor screen is preferably formed by performing a screen printing method a plurality of times.

Preferably, the substrate is provided with a means for emitting electrons in a matrix.

The means for emitting electrons is preferably a surface conduction electron-emitting device.

The means for emitting electrons to the phosphor screen preferably comprises a cathode ray tube.

With this configuration, the area of the pixel region of the phosphor forming portion of the phosphor screen to which the electrons are irradiated becomes larger than the projected area when viewed from the substrate side, and the effective current density is reduced. The size can be reduced, and the luminance of the image display device can be improved by increasing the luminous efficiency, and the local deterioration of the phosphor can be suppressed.

Here, the phosphor screen means a film coated with a powdered phosphor. Here, the area of the pixel region of the portion to be irradiated with electrons includes a portion where the current density is 1/10 of the highest portion when considering the current density distribution in one pixel. Show the area of the range.

The projection area indicates the apparent area when viewed from a direction perpendicular to the image forming member.

Here, regarding these areas, since the phosphor used in the image display device as shown in the present invention is generally a powder, the actual phosphor screen has very fine irregularities and the surface area is very small. Although the irradiation area and the projection area here are considerably large, irregularities caused by the particle size of the phosphor are ignored and considered.Specifically, irregularities with a period smaller than the average particle diameter of the phosphor are considered. On average, it will be considered as the shape of the phosphor screen.

Since the phosphor forming portion has a portion at an angle of 30 degrees or more and less than 90 degrees with respect to the substrate,
Since the area irradiated with electrons can be increased and the effective current density can be reduced, luminous efficiency can be increased and luminance can be improved.

Here, regarding the angle formed by the phosphor screen with respect to the substrate, as described above, the phosphor is a powder, and has a slight angle with respect to the rear plate. In the meantime, irregularities having a period smaller than the average particle diameter of the phosphor are considered as a screen shape on average.

Each pixel region of the phosphor screen has a different thickness in a phosphor forming portion formed in one pixel region, thereby increasing an area irradiated with electrons and relaxing an effective current density. Therefore, the luminous efficiency can be increased and the luminance can be improved.

The difference in film thickness between the thickest portion and the thinnest portion of the phosphor forming portion is at least twice the average particle diameter of the phosphor constituting the phosphor forming portion, and the area irradiated with electrons is reduced. Since the current density can be increased and the effective current density can be reduced, the luminous efficiency can be increased and the luminance can be improved.

Since the phosphor forming portion has a concave shape, the area irradiated with electrons can be increased and the effective current density can be reduced, so that the luminous efficiency can be increased and the luminance can be improved. .

The image forming member is provided with a shielding member for dividing the phosphor screen into respective pixel areas, and the shielding member is thicker than the average thickness of the phosphor forming portion of the phosphor screen. By covering the side wall surface portion with a phosphor, the area irradiated with electrons can be increased and the effective current density can be reduced, so that the luminous efficiency can be increased and the luminance can be improved.

The shielding member has a substantially parallel plane portion facing the substrate and a side wall surface forming an angle of 30 degrees or more and less than 90 degrees. By covering the side wall surface with a phosphor, the area irradiated with electrons can be reduced. Since the current density can be increased and the effective current density can be reduced, the luminous efficiency can be increased and the luminance can be improved.

Here, as the form of the shielding member, those having openings in various forms such as a matrix form and a stripe form can be appropriately used.

The fact that the side wall surface is covered with the phosphor will be described. As described above, the shielding member is thicker than the average thickness of the phosphor screen, and if the phosphor adheres to a portion higher than the average thickness of the phosphor screen as viewed from the image forming member, the side wall surface portion of the shielding member ( It may be adhered to the entire side wall surface, or may be adhered to the side wall surface of a portion which is not the entire surface but higher than the average thickness of the phosphor screen. It is possible to consider including adhesion to a part.)
Is covered with a phosphor.

The shielding member has a black portion in contact with the image forming member and a white portion located on the black portion.
Light emitted from the phosphor covering the shielding member is reflected by the white portion on the shielding member, so that the luminous efficiency can be improved.

Here, black means that the diffuse reflectance is 10% or less and is light absorbing, and white means that the diffuse reflectance is 70%.
That is all.

Since the phosphor forming portion has a plurality of convex portions, the area irradiated with electrons can be increased and the effective current density can be reduced, so that the luminous efficiency is increased and the luminance is improved. Can be done.

Since the phosphor screen is formed by the screen printing method, the phosphor forming portion can easily obtain the desired shape as described above.

The phosphor forming portion of the phosphor screen can be easily formed into the desired shape as described above by forming the phosphor forming portion by performing the screen printing method a plurality of times.

[0062]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

(Embodiment 1) Referring to FIGS. 1 to 4,
The first embodiment will be described.

After washing and drying 2.8 mm thick soda lime glass (glass substrate) serving as an image forming member,
Using a glass paste and a black pigment paste containing a black pigment, as shown in FIG.
m, 720 stripes having a pitch of 290 μm, and 24 stripes having a width of 300 μm in the horizontal direction and a pitch of 650 μm.
A zero-pattern pattern having a thickness of 5 μm in both the vertical and horizontal directions is produced by a screen printing method.
0 (black matrix: a shielding member such as a black conductive member).

The black matrix 1010 is provided for the purpose of preventing color mixing of the phosphor, preventing color shift even if the beam position is slightly shifted, and absorbing external light to improve the contrast of an image. Can be

In this embodiment, the black matrix 1010 is manufactured by the screen printing method. However, the present invention is not limited to this. For example, the black matrix 1010 may be manufactured by using a photolithography method. It is preferable to use a printing method.

As a material of the black matrix 1010, a black pigment paste containing a glass paste and a black pigment is used. However, the present invention is not limited to this. For example, carbon black may be used.

In this embodiment, the black matrix 1010 is formed in the form of a matrix as shown in FIG. 3C. However, the present invention is not limited to this. (Fig. 3
(See (a) and (b)).

Next, as shown in FIG. 2, the opening of the black matrix 1010 is a phosphor screen divided into a plurality of pixel areas, and the screen is formed using red, blue, and green phosphors (phosphor paste). The phosphor forming portion 1008 was manufactured by a printing method.

Here, a procedure for forming the phosphor forming portion 1008 will be described.

First, the first-layer phosphor is printed on the opening of the black matrix 1010 as shown in FIG. 2A, and then the second-layer phosphor is partially applied to the first-layer phosphor. Was printed as shown in FIG. 2 (b).

In the present embodiment, the phosphor is a P22 phosphor used in the field of CRT, and a red phosphor (P22-
_{RE3; Y 2 O 2 S:} Eu3 +), blue (P22-B _2;
ZnS: Ag, Al), green (P22-GN _4; Zn
S: Cu, Al) and the average particle diameter is the median diameter Dme
Although 7.0 μm was used for d, the present invention is not limited to this, and other phosphors may be used.

Next, a resin intermediate film is formed by a filming process known in the field of cathode ray tubes, a metal deposition film is formed thereafter, and finally, the resin intermediate layer is thermally decomposed and removed. A metal back 1009 having a thickness of 1000 mm was produced as shown in FIG.

When the film thickness distribution of the phosphor forming portion 1008 of the manufactured face plate 1007 was measured for one pixel region, the thinnest portion was 10.2 μm and the thickest portion was 28.6 μm. The surface of the phosphor at the highest current density had an inclination of about 30 ° with respect to the rear plate.

An image display device was manufactured by fixing the face plate 1007 manufactured in this manner substantially in parallel with a rear plate 1005 as a substrate. A face plate 1007 manufactured based on the prior art (a comparative example described later) was manufactured. Luminous efficiency and luminance were improved by 4% as compared with the image display device manufactured using the above-mentioned method. In addition, local phosphor degradation, that is, phosphor degradation in a portion having the highest current density was improved, and the phosphor lifetime could be extended by 15%.

Here, the term "life of the phosphor" means a period of time from when deterioration of the phosphor progresses to when the luminance is reduced by 30%.

In the above-described embodiment, the driving duty of the element is changed to 20 times as compared with the normal display state, and driving is performed in a state in which electron emission is performed 20 times the normal state.
When the time until the luminance was reduced by 30% was measured, it was 115 hours in the present embodiment, whereas the comparative example described later was 100 hours (here, the drive duty 20 times means, for example, the element drive time). The pulse width of the voltage is set to be 20 times as long as the normal display state, and driving is performed. Specifically, in a display device driven line-sequentially by 1000 scanning lines, each electron-emitting device is normally operated for 1 second. SEC per millimeter
Can be realized by driving with a pulse width of 20 milliseconds SEC, which is 20 times as large.

From this, it is expected that the display device of the present invention will be able to display for 2300 hours, while the life in a normal display state is 2,000 hours for the comparative example described later.

Next, the horizontal composition and manufacturing method of the display panel of the image display device to which the present invention is applied will be described with reference to specific examples.

FIG. 4 is a perspective view of a display panel used in the embodiment, in which a part of the panel is cut away to show internal horizontal structure.

In the figure, 1005 is the bottom of the outer container (sometimes referred to as the rear plate), 1006 is the side wall,
7 is a face plate, a rear plate 1005,
An airtight container for maintaining the inside of the display panel at a vacuum is formed by the side wall 1006 and the face plate 1007.

When assembling the airtight container, it is necessary to seal the joints of the members in order to maintain sufficient strength and airtightness. For example, frit glass is applied to the joints, and the joints are exposed to air or a nitrogen atmosphere. In, 400-degree Celsius
Sealing was achieved by baking at 500 degrees for 10 minutes or more. A method of evacuating the inside of the airtight container to a vacuum will be described later.

Here, a substrate 1001 is defined on the rear plate 1005. On the substrate 1001, a surface conduction electron-emitting device 100 as a means for emitting electrons is provided.
2 × N × 2 are formed. (N and M are positive integers of 2 or more, and are appropriately set according to the target number of display pixels.

In this embodiment, N = 720, M
= 240. The N × M surface conduction electron-emitting devices are composed of M row direction wirings 1003 and N column direction wirings 103.
04 is a simple matrix wiring. The part constituted by the substrate 1001 and the column direction wiring 1004 is called a multi-electron beam source.

In this embodiment, the substrate 1001 of the multi-electron beam source is provided on the rear plate 1005 of the hermetic container.
Is fixed, but the substrate 1 of the multi-electron beam source is
When 001 has sufficient strength, the substrate 1 of the multi-electron beam source is used as a rear plate of the hermetic container.
001 itself may be used.

Dx1 to Dxm and Dy1 to Dy
n and Hv are electric connection terminals having an airtight structure provided for electrically connecting the display panel and an electric circuit (not shown). Dx1 to Dxm are electrically connected to the row wiring 1003 of the multi electron beam source, Dy1 to Dyn are electrically connected to the column wiring 1004 of the multi electron beam source, and Hv is electrically connected to the metal pack 1009 of the face plate.

In order to evacuate the inside of the hermetic container to a vacuum, after assembling the hermetic container, an exhaust pipe (not shown) and a vacuum pump are connected, and the inside of the hermetic container is 1.33 × 10 −5 ( Evacuate to about Pa). Thereafter, the exhaust pipe is sealed, but a getter film (not shown) is formed at a predetermined position in the airtight container immediately before or after the sealing in order to maintain the degree of vacuum in the airtight container.

The getter film is, for example, a film formed by heating and depositing a getter material containing Ba as a main component by means of a heater or high-frequency heating. The degree of vacuum is maintained at minus the third power or 1.33 × 10 minus the fifth power (Pa).

The basic structure and manufacturing method of the display panel according to the embodiment of the present invention have been described above.

Next, the multi-electron beam source used for the display panel of the above embodiment will be described. The material, shape, and manufacturing method of the surface conduction electron-emitting device are not limited as long as the multi-electron beam source used in the image display device of the present invention is an electron source in which surface conduction electron-emitting devices are arranged in a simple matrix.

However, the present inventors have found that among the surface conduction electron-emitting devices, those in which the electron-emitting portion or its peripheral portion is formed of a fine particle film have excellent electron-emitting characteristics and can be easily manufactured. ing.

Therefore, it can be said that it is most suitable for use in a multi-electron beam source of a high-luminance, large-screen image display device.

Therefore, in the display panel of the above embodiment, a surface conduction electron-emitting device in which the electron-emitting portion or its peripheral portion is formed of a fine particle film is used.

It is also possible to use a cathode ray tube or the like as a means for emitting electrons instead of the surface conduction electron-emitting device.

(Embodiment 2) Next, referring to FIG.
An embodiment will be described.

A black matrix 1010 was formed on soda-lime glass having a thickness of 2.8 mm similar to that of the first embodiment by a screen printing method. Here, first, a black pigment paste containing a glass paste and a black pigment was printed for the first time, and a black layer 1014 was formed to have a width of 150 μm
m, 720 stripes having a pitch of 290 μm, and 24 stripes having a width of 300 μm in the horizontal direction and a pitch of 650 μm.
A pattern having zero lines was formed by a screen printing method with a thickness of 5 μm in both the vertical and horizontal directions.

Next, a glass paste and alumina fine particles dispersed in a resin binder were screen-printed five times on the black layer 1014 to form a white layer 1015 of a black matrix 1010. At the time of each printing, printing was performed in a finer pattern than that before printing.

The shape of the prepared black matrix 1010 was observed with a scanning electron microscope, and the film thickness and the like were measured with a stylus type surface roughness meter. As a result, the shape was as shown in FIG.
The surface A is substantially parallel to the face plate 1007, and the surface B
Was about 40 degrees with the face plate 1007. The thickness of the thickest part of the black matrix 1014 was 32.3 μm.

Next, a phosphor is printed on the opening of the black matrix 1010 (FIG. 5B), and a metal back 1009 is produced by a filming process (FIG. 5).
(C)). Observation and measurement of the formed phosphor forming portion 1008 revealed that the central portion in one pixel region was concave, and there was a portion having an angle of about 40 degrees with the rear plate 1005. The thickness of the central phosphor forming portion 1008 is 1
It was 5.7 μm.

The face plate 1007 thus manufactured is fixed substantially parallel to the rear plate 1005,
When the image display device was manufactured, the luminous efficiency and the luminance were improved by 12% as compared with the image display device manufactured using the conventional face plate 1007. In addition, local deterioration of the phosphor was improved, and the life of the phosphor was extended by 30%.

(Embodiment 3) Next, referring to FIG.
An embodiment will be described.

A black matrix 1010 having a width of 180 μm in the vertical direction was formed on a soda lime glass having a thickness of 2.8 mm in the same manner as in the first embodiment by a screen printing method.
A pattern having 720 stripes with a pitch of 290 μm, 240 stripes with a width of 300 μm and a pitch of 650 μm in the horizontal direction was prepared. Here, the black matrix 1010 was printed eight times, and the thickness of the produced black matrix 1010 was measured.
m.

Here, as the material of the black matrix 1010 for screen printing, the black pigment paste was used eight times. However, the material is not limited to this. If a white material such as alumina is used for this layer, the light of the phosphor can be efficiently extracted to the observer side without absorbing the light of the phosphor on the wall surface.

Next, a phosphor was printed on the opening of the black matrix 1010, and a metal back 1009 was formed by a filming process. The phosphor forming section 100 thus prepared
Observation and measurement of No. 8 showed that the structure was as shown in FIG. 6, where the central part in one pixel area was concave and the angle formed with the rear plate 1005 was about 60 degrees. The thickness of the phosphor forming portion 1008 at the center is 12.9 μm.
m.

The face plate 1007 manufactured as described above is fixed substantially parallel to the rear plate 1005.
When the image display device was manufactured, the luminous efficiency and the luminance were improved by 17% as compared with the image display device manufactured using the conventional face plate 1007. In addition, the local deterioration of the phosphor was improved, and the life of the phosphor could be extended about twice.

(Embodiment 4) Referring to FIG.
An embodiment will be described.

A black pigment paste was used on soda lime glass having a thickness of 2.8 mm similar to that of Embodiment 1, and stripes having a width of 100 μm and a pitch of 290 μm were formed in the vertical direction.
A pattern having 0 stripes, 240 stripes having a width of 300 / μm and a pitch of 650 μm in the horizontal direction, and having a width of 5 μm in both the vertical and horizontal directions
A black matrix 1010 was prepared by a screen printing method with a thickness of m.

Next, a phosphor was screen-printed on the opening of the black matrix 1010 to form a phosphor forming portion 1008. Here, a method for forming the phosphor forming portion 1008 will be described.

First, a first-layer phosphor is printed in the opening of the black matrix 1010. Thereafter, the phosphor of the second layer is printed so that a plurality of convex shapes are formed on the phosphor of the first layer. In the present embodiment, the screen printing is performed twice. However, the present invention is not limited to this. If a plurality of convex shapes are formed on the phosphor forming portion 1008, the object of the present invention is achieved. Can be achieved.

Observation and measurement of the produced phosphor forming portion 1008 revealed that the structure was as shown in FIG. 7, and that a plurality of convex shapes existed on the phosphor forming portion 1008 in one pixel region. The thickness of the thinnest portion of the phosphor forming portion 1008 is 13.9 μm, and the thickness of the thickest portion is 23.9 μm.
It was 9.1 μm. The surface of the phosphor at the highest current density had an inclination of about 30 ° with respect to the rear plate.

The face plate 1007 thus manufactured is fixed substantially parallel to the rear plate 1005,
When the image display device was manufactured, the luminous efficiency and the luminance were improved by 9% as compared with the image display device manufactured using the conventional face plate 1007. In addition, the local phosphor lifetime could be extended by 15%.

(Comparative Example) Next, a comparative example of the present invention will be described with reference to FIG.

A soda-lime glass having a thickness of 2.8 mm, similar to that of the first embodiment, and a black pigment paste were used, and stripes having a width of 100 μm and a pitch of 290 μm were formed in the vertical direction.
A pattern having 0 stripes and 240 stripes having a width of 300 μm and a pitch of 650 μm in the horizontal direction is 5 μm both vertically and horizontally.
The black matrix 1010 was produced by a screen printing method with a thickness of.

Next, a phosphor was printed on the openings of the black matrix 1010, and a metal back 1009 was formed by a filming process. The phosphor forming section 100 thus prepared
Observation / measurement of FIG. 8 shows a structure as shown in FIG. 8, and a region 1011 to be irradiated with electrons in one pixel region (an electron beam irradiation region 1011; FIGS. 2, 5, 6, and 7). Each of the phosphor screens has a corresponding area), except for the irregularities caused by the size of the phosphor particles, and was substantially flat, and the thickness of the phosphor was 18.4 μm.

The face plate 1007 thus manufactured is fixed substantially parallel to the rear plate 1005,
An image display device was manufactured and used as a comparative example of the image display device of the present invention.

[0116]

According to the present invention described above, in an image display device having a phosphor screen that excites a phosphor by an electron beam to emit light, the area of the phosphor screen irradiated with electrons is increased. By effectively reducing the current density of the electron beam, it becomes possible to increase the luminous efficiency of the phosphor and improve the brightness of the image display device.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an image display device according to a first embodiment.

FIG. 2 is a schematic cross-sectional view of a fluorescent screen of the image display device according to the first embodiment.

FIG. 3 is a view showing a phosphor arrangement form of a fluorescent screen.

FIG. 4 is a perspective view in which a part of the image display device of the embodiment is cut away.

FIG. 5 is a schematic sectional view of a fluorescent screen of the image display device according to the second embodiment.

FIG. 6 is a schematic sectional view of a fluorescent screen of an image display device according to a third embodiment.

FIG. 7 is a schematic sectional view of a fluorescent screen of an image display device according to a fourth embodiment.

FIG. 8 is a schematic sectional view of a fluorescent screen of an image display device as a comparative example.

FIG. 9 is a diagram in which surface conduction electron-emitting devices are connected by matrix wiring.

FIG. 10 is a perspective view of a conventional image display device with a part cut away.

FIG. 11 is a diagram showing an example of a current density distribution in one pixel.

[Explanation of symbols]

 1001 Substrate 1002 Electron beam source 1005 Rear plate 1007 Face plate 1008 Phosphor forming part 1009 Metal back 1010 Black matrix 1011 Electron beam irradiation area 1012 High voltage lead-out wiring 1013 High voltage power supply 1014 Black layer 1015 White layer 4001 Rear plate 4006 Face plate 4008 Phosphor Film 4009 Metal back 4010 High voltage power supply 4011 High voltage wiring

Claims (26)

[Claims] 1. An image display apparatus comprising: an image forming member on which a phosphor screen having a plurality of pixel regions is arranged; and a substrate opposed to the phosphor screen and on which a plurality of electron-emitting devices are arranged. The electron-emitting device includes a low-potential-side electrode and a high-potential-side electrode arranged side by side on the substrate, and an electron-emitting portion located between the two electrodes. An image display device having an inclined surface that is uniformly inclined toward the image display device. 2. An image display apparatus comprising: an image forming member on which a phosphor screen having a plurality of pixel regions is disposed; and a substrate disposed to face the phosphor screen and on which a plurality of electron-emitting devices are disposed. The electron-emitting device includes a low-potential-side electrode and a high-potential-side electrode provided in parallel with the substrate, and an electron-emitting portion located between the two electrodes, and each of the plurality of pixel regions has a concave shape. An image display device, comprising: an inclined surface facing the center thereof. 3. A surface conduction type electron-emitting device comprising: a high potential side electrode and a low potential side electrode juxtaposed on the substrate; and a conductive film having an electron emission portion disposed between the two electrodes. 3. The image display device according to claim 1, wherein the image display device is an emission device. 4. The electron-emitting device according to claim 1, wherein said electron-emitting device is a horizontal field-emission device having a low-potential-side emitter electrode and a high-potential-side gate electrode provided side by side on said substrate. Or the image display device according to 2. 5. An image display device comprising: an image forming member on which a phosphor screen having a plurality of pixel regions is disposed; and a substrate disposed to face the phosphor screen and on which a plurality of electron-emitting devices are disposed. The image display device, wherein each of the plurality of pixel regions is formed in a concave shape, and has an inclined surface toward a center thereof. 6. The image according to claim 5, wherein said electron-emitting device has a pair of electrodes arranged in parallel on said substrate and an electron-emitting portion located between said pair of electrodes. Display device. 7. The electron-emitting device is a surface conduction electron-emitting device including a pair of electrodes arranged in parallel on the substrate and a conductive film having an electron-emitting portion disposed between the pair of electrodes. The image display device according to claim 5, wherein: 8. The image display device according to claim 5, wherein said electron-emitting device is a horizontal field-emission device having an emitter electrode and a gate electrode arranged in parallel on said substrate. 9. The semiconductor device according to claim 1, wherein said inclination has an angle of not less than 30 degrees and less than 90 degrees with respect to said substrate.
9. The image display device according to any one of 8. 10. The apparatus according to claim 1, wherein the phosphors arranged in each of the plurality of pixel regions have different thicknesses in each of the pixel regions. Image display device. 11. The method according to claim 1, wherein the difference between the maximum value and the minimum value of the thickness of the phosphor is at least twice the average particle size of the phosphor particles constituting the phosphor. 11. The image display device according to any one of items 10. 12. The image display device according to claim 1, wherein a shielding member is arranged between said plurality of pixel regions. 13. An image display device comprising: an image forming member having a phosphor screen divided into a plurality of pixel regions; and a substrate having means for emitting electrons to said phosphor screen, wherein said phosphor screen is provided. Wherein each pixel region has a phosphor having a surface area larger than a projected area when viewed from the substrate side. 14. The image display device according to claim 13, wherein said phosphor has a portion forming an angle of 30 degrees or more and less than 90 degrees with respect to said substrate. 15. The phosphor screen according to claim 13, wherein each pixel area of the phosphor screen has a different thickness in the phosphor formed in one pixel area.
An image display device according to claim 1. 16. The method according to claim 15, wherein the difference in film thickness between the thickest part and the thinnest part of the phosphor is at least twice the average particle diameter of the phosphor particles constituting the phosphor. The image display device as described in the above. 17. The image display device according to claim 13, wherein said phosphor has a concave shape. 18. The image forming member is provided with a shielding member for dividing the phosphor screen into respective pixel regions, wherein the shielding member is thicker than an average thickness of the phosphor of the phosphor screen. The image display device according to any one of claims 13 to 17, wherein a side wall surface of the member is covered with a phosphor. 19. The shielding member has a substantially parallel surface portion facing the substrate and a side wall surface portion forming an angle of 30 degrees or more and less than 90 degrees, and covers the side wall surface portion with a phosphor. Item 1
9. The image display device according to 8. 20. The image display device according to claim 18, wherein the shielding member has a black portion in contact with the image forming member and a white portion located thereon. 21. The image display device according to claim 13, wherein said phosphor has a plurality of convex portions. 22. The phosphor screen according to claim 13, wherein said phosphor screen is formed by a screen printing method.
2. The image display device according to claim 1. 23. The image display device according to claim 22, wherein the phosphor of the phosphor screen is formed by performing a screen printing method a plurality of times. 24. The image display device according to claim 13, wherein said substrate is provided with means for emitting electrons in a matrix. 25. An image display apparatus according to claim 24, wherein said means for emitting electrons is a surface conduction electron-emitting device. 26. The image display device according to claim 13, wherein said means for emitting electrons to said phosphor screen comprises a cathode ray tube.