JPH11339697A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of forming a large screen at a low cost, by simplifying its structure. SOLUTION: An enclosure 10 of this image display device is evacuated, and is composed of a front plate 11 of glass material provided with a fluorescent screen and an anode on its inner surface, a back plate 13 of glass with a light radiator 14 fixed to its lower surface and a side plate 12. On the upper surface of the back plate 13, modulation electrodes 18 arranged in the direction of an arrow 2 for every designated interval and extending in the direction of an arrow 1 and vertical electrodes 20 arranged in an electrically insulated condition from the modulation electrodes 18 and extending in the direction of the arrow 2 are formed, and a photo cathode is formed on the modulation electrode 18 at the crossing part of them. In addition, a supporting wall 22 is disposed with a designated interval kept between them, perpendicularly to the back plate 13 between the perpendicular electrodes 20, in order to support the front plate 11 and the back plate 12.

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, and more particularly, to a flat type image display device having a simplified structure and realizing low cost.

[0002]

2. Description of the Related Art In recent years, there has been an increasing number of occasions in which a large-screen image display device is installed in homes, offices, and streets. As the application range of the image display device is further expanded, various types of image display devices for realizing a large flat panel, low cost, and low power consumption have been developed. In particular, space saving is also considered in consideration of an installation environment, and some flat-type image display devices have been proposed.

[0003] As such a conventionally proposed flat-type image display device, a plasma display panel (Plas- matic display panel) is known.
ma Display Panels: Hereinafter abbreviated as PDP. ), Photocathode display (Brad Culkin: “Photocatho
de Displays ”InformationDisplay, Vol.13 No.8 pp.14
17 (1997)), surface conduction electron-emitting display (Su
rface-conduction Electron emitter Display:
Abbreviated as SED. ) (E. Yamaguchi, et al .: “A 10-in. Su
rface Conduction Electron-Emitter Display ”, Proces
sing of SID '97, pp. 52-55 (May 1997)), Field Emission Display (hereinafter FE)
Abbreviated as D. (Tanaka, Kishida, Yano, Kishino: "Full-color field emission display by new driving method", Journal of the Institute of Image Information and Television Engineers, Vol. 51, No. 7, pp. 1054-1060 (1997)).

[0004]

[0005] Among such conventionally proposed image display devices, PDPs are expensive and consume high power. Also, due to its characteristics, there is also a problem of false contours. In addition, photocathode displays use electro-luminescent (Electro-Lumi
nescent: Abbreviated as EL hereinafter. ) Is used, but this EL is mounted inside the vacuum tube corresponding to each pixel. Therefore, when the EL has failed, it is not possible to perform a failure recovery work by replacing the EL.
There is a problem in that the pixel corresponding to the EL once failed will not be displayed. Further, the drive voltage of the modulation signal is very high, and when the number of pixels increases as the image quality is required on a large screen, the number of ELs corresponding to the number of pixels is required. Therefore, there is a problem that the drive circuit becomes expensive. As described above, since the photocathode display is difficult to maintain, there is a problem that the reliability as an image display device is reduced and the cost is extremely high.

[0005] Further, among the image display devices proposed so far, S
The ED has a very large number of extraction electrodes for modulation corresponding to pixels due to its structure. Further, due to its characteristics, the lifetime becomes a problem, and electron scattering cannot be suppressed.
As described above, the SED has a problem in that the cost is high due to a large number of extraction electrodes, and the reliability and the image quality are deteriorated due to the lifetime and electron scattering.

Further, among the image display devices proposed in the past, FED cannot suppress electron scattering. In addition, the structure is very complicated, so the cost is high,
It is difficult to enlarge the screen. As described above, the FED also has a problem that the cost is high due to the complexity of the structure and the image quality is deteriorated due to electron scattering.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device which can simplify the structure, facilitate maintenance, and reduce the cost.

Another object of the present invention is to provide an image display device capable of increasing the screen size.

[0009]

According to the first aspect of the present invention, there are provided (a) a light irradiating means for irradiating light, and (b) a first flat plate for transmitting the light irradiated by the light irradiating means. (C) electron emitting means for emitting electrons by irradiating light transmitted through the first flat plate; and (d) electron modulating means for modulating the electrons emitted by the electron emitting means based on image information. (E) The image display device includes a second flat plate that transmits the color light of the phosphor surface formed on the incident surface by the incidence of the electrons modulated by the electron modulation means.

That is, according to the first aspect of the present invention, the light irradiated by the light irradiating means is transmitted through the first flat plate, and when the transmitted light is irradiated, electrons are emitted by the electron emitting means. I have. Then, the emitted electrons are modulated based on the image information, the modulated electrons are made to enter the second flat plate, and the phosphor screen formed on the incident surface emits light. The color light is transmitted through the second flat plate.

According to the second aspect of the present invention, (a) light irradiating means for irradiating light, (b) a first flat plate for transmitting light irradiated by the light irradiating means, and 1
A second flat plate that transmits colored light of a fluorescent screen formed on a surface facing the flat plate, and (d) an electron emission that emits electrons by being irradiated with the light transmitted through the first flat plate. Means, (e) an electron emission position selection means for selectively emitting only one scanning line of electrons emitted by the electron emission means, and (f) an electron selectively emitted by the electron emission position selection means as image information. The image display device is provided with an electronic modulation means for selecting and modulating each of the color development units of one pixel based on the basis, and radiating as an electron beam to the phosphor screen formed on the second flat plate.

That is, according to the second aspect of the present invention, the light irradiated by the light irradiating means is transmitted through the first flat plate, and the transmitted light is irradiated on the electron emitting means.
In addition, the second flat plate has a fluorescent surface formed on a surface facing the first flat plate, and transmits light emitted from the fluorescent surface. When the electron emitting means is irradiated with light, it emits electrons. The emitted electrons are selectively emitted only for one scanning line, and further selected and modulated based on image information for each color forming unit of one pixel, and are emitted to a fluorescent screen formed on the second flat plate. It emits as an electron beam.

According to a third aspect of the present invention, in the image display device according to the first or second aspect, a region sandwiched between the first flat plate and the second flat plate is maintained in a vacuum state. It is characterized by:

That is, according to the third aspect of the present invention, the electron emission means, the electron modulation means, the electron emission position selection means and the like between the first plane plate and the second plane plate are provided in a vacuum, and light irradiation is performed. Means are provided outside the vacuum.

According to a fourth aspect of the present invention, in the image display device of the third aspect, the first flat plate and the second flat plate are sandwiched by a support.

In other words, according to the fourth aspect of the present invention, the first flat plate and the second flat plate are sandwiched between the support members to support each other.

According to a fifth aspect of the present invention, in the image display device according to the fourth aspect, the periphery of each phosphor on the phosphor screen formed on the second flat plate is separated from the adjacent phosphor. A black substance is applied as a black matrix, and the support is pressed against the black matrix of the second flat plate with a width smaller than the width of the black matrix.

That is, according to the fifth aspect of the present invention, a black substance is applied as a black matrix around each of the phosphors formed on the second flat plate so as to be separated from the adjacent phosphors. With a width smaller than the width of the matrix, the support is pressed against the second flat plate.

According to a sixth aspect of the present invention, in the image display device of the fifth aspect, the black matrix other than the black matrix pressing the support is formed so as to be narrower than the pressing width of the support. It is characterized by being.

That is, in the invention according to the sixth aspect, a black material is applied around each phosphor formed on the second flat plate so as to be separated from the adjacent phosphor. Regarding the black matrix, a black matrix other than the black matrix pressing the support is formed so as to be narrower than the pressure width of the support.

According to a seventh aspect of the present invention, in the image display device of the second aspect, the electron modulation means selects electrons emitted by the electron emission means for each color forming unit of one pixel based on image information. And adjusting the amount of electron beams emitted to the phosphor screen formed on the second flat plate.

That is, according to the present invention, the electrons emitted by the electron emitting means by the electron modulating means are selected for each color forming unit of one pixel based on the image information.
The amount of the electron beam emitted as an electron beam to the phosphor screen formed on the second flat plate is adjusted.

According to an eighth aspect of the present invention, in the image display device of the first to seventh aspects, a part of a wall constituting a container in which the first flat plate and the second flat plate are sealed is provided. It is characterized by comprising.

That is, according to the invention described in claim 8, the first flat plate and the second flat plate are configured to be walls of a sealed container.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows a main part of an image display apparatus according to an embodiment of the present invention with a part thereof being cut away. This image display device has a hollow envelope 10. The envelope 10 includes a flat front plate 11 having a square or rectangular upper surface, and four side plates 12 each having an upper end surface joined along each side of the lower surface of the front plate 11. Have. However, the upper end surface of one front side plate 12 in the figure is joined to a portion inside a predetermined length from the edge along one side of the lower surface of the front plate 11. The ends of the four side plates 12 are joined at positions corresponding to the respective corners of the front plate 11. The lower end surfaces of these four side plates 12 form a surface parallel to the front plate 11 and are joined to predetermined positions on the upper surface of a rear plate 13 having a size larger than the front plate 11 to form a hollow container. The envelope 10 is constituted. Front plate 11 and rear plate 13
Is a flat plate made of a glass material having a thickness of about 3 mm and transparent to visible light. The four side plates 12 are arranged perpendicular to the front plate 11 and the rear plate 13. The inside of the envelope 10 is exhausted to be in a vacuum state.

A light irradiator 14 for irradiating the entire surface of the rear plate 13 inside the envelope 10 is mounted below the rear plate 13. As the light irradiator 14, an EL or a small fluorescent lamp can be used, and a backlight made of such components can be used. In short, it is only necessary that light can be irradiated from the lower surface side of the rear plate 13 so as to transmit the light.

The envelope of the front plate 11, in front of the corner portion near in FIG 1, the anode terminal 15 ₁ is attached to section consists of a U-shaped conductive material. Here, including an outline of the lower surface of the structure of the front plate 11 in FIG. 1 with reference to FIG. 2, illustrating a mounting state of the anode terminal 15 _1.

FIG. 2 schematically shows the structure of the surface located below the front plate 11 in FIG. The edge of one side of the front plate 11, the anode lead-out electrode 15 ₂ which is a rectangle formed of a conductive thin film is formed. In contact with the anode lead-out electrodes 15 _2, cross-section has an anode terminal 15 ₁ is attached consisting of U-shaped conductive material. The anode lead-out electrode 15 ₂ is in contact with the one side end face of the front plate 11 of the anode terminal 15 ₁ is attached, the anode terminal 15 ₁ and the anode lead-out electrode 15 ₂ are electrically connected. Envelope 10
The lower surface of the front plate 11 serving as the inner surface of the
Is applied to form a phosphor screen. The phosphor is R
The three types (red), G (green), and B (blue) are arranged in order on the lower surface of the front plate 11, so that coloring is performed in pixel units. A film-shaped metal back 16 made of a conductive thin film of aluminum or the like is formed so as to cover the phosphor screen. Metal back 16
Is the anode lead-out electrode 15 ₂ and the electrical connection. Therefore, the metal back 16 and the anode terminal 1
5 ₁ A, through the anode lead-out electrode 15 ₂ at the lower surface side of the front plate 11 in FIG. 1 in a state that is electrically connected. The anode terminal 15 ₁ is connected to the anode voltage applying unit (not shown) arranged outside the envelope 10,
For the metal back arranged on the lower surface of the front plate 11,
An anode voltage can be applied. That is, the metal back 16 functions as an anode electrode.

Returning to FIG. 1, the inside of the envelope 10 will be described.

Inside the envelope 10, a plurality of plate-shaped modulation electrodes 18 are arranged in parallel with each other at a predetermined interval in close proximity to the upper surface of the rear plate 13. These modulation electrodes 1
8 extends in the arrow direction 1 in the figure. On the other hand, the envelope 10
Outside, a plate-shaped modulation extraction electrode 19 is arranged on the upper surface of the rear plate 13 in parallel with each of these modulation electrodes 18. The modulation electrode 18 and the modulation extraction electrode 19 are arranged so as to be electrically connected to each other inside the envelope 10. Alternatively, they may be arranged so as to be electrically connected to each other outside the envelope 10. In any case, a desired control voltage can be applied from the outside of the envelope 10 to each of the modulation electrodes 18 arranged inside. The modulation electrode 18 is a transparent electrode made of ITO (Indium Tin Oxide), and is transparent to visible light.

Further, inside the envelope 10, a rear plate 13 is provided.
A plurality of plate-like vertical address electrodes 20 are arranged on the upper surface of the modulation electrode 18 in parallel with each other at a predetermined interval. These vertical address electrodes 20 extend in the arrow direction 2 as a direction orthogonal to the arrow direction 1. However, the vertical address electrode 20 is arranged in a state of being electrically insulated from the modulation electrode 18. On the other hand, outside the envelope 10, plate-like vertical address extraction electrodes 21 are arranged in parallel with each other on the upper surface of the rear plate 13 in FIG. The vertical address electrodes 20 and the vertical address extraction electrodes 21 are arranged so as to be electrically connected inside the envelope 10. Alternatively, it is also possible to arrange so as to be electrically connected inside the envelope 10. In any case, a desired control voltage can be applied from outside the envelope 10 to the vertical address electrode 20 disposed inside.

As described above, the vertical address electrodes 20 arranged along the arrow direction 2 are arranged so as to intersect with the modulation electrodes 18 arranged along the arrow direction 1. An opening is provided at the intersection with the modulation electrode 18 disposed on the lower side. Modulation electrode 18
A photocathode is formed in a film shape on the upper surface of the portion corresponding to the opening of the vertical address electrode 20. That is, the modulating electrode 18 and the vertical address electrode 20 are arranged so as to intersect with each other with a photocathode formed in a film shape interposed therebetween at the intersection.

Further, the rear plate 13 inside the envelope 10
A plurality of flat support walls 22 are arranged perpendicular to the rear plate 13 so as to be parallel to each other.
These support walls 22 are flat plates made of an insulator and having a thickness of about 0.2 mm, and extend in the arrow direction 2. The lower end surface of the support wall 22 is joined to the upper surface of the rear plate 13 where the vertical address electrodes 20 are not arranged, and the upper end surface is joined to the lower surface of the front plate 11. By arranging vertically with respect to the rear plate 13, the front plate 12 and the rear plate 13 can be supported.

Hereinafter, the inside of the envelope 10 of the image display device shown in FIG. 1 will be described in more detail. First, with reference to FIGS. 3 and 4, the configuration on the lower surface side of the front plate 11 inside the envelope will be described with reference to FIG. 1.

FIG. 3 schematically shows the structure of the lower surface of the front plate 11 inside the envelope 10 shown in FIG. The lower surface of the front plate 11 inside the envelope in FIG. 1 corresponds to the upper surface of the front plate 11 in FIG. In FIG. 3, the fluorescent screen is formed on the upper surface of the front plate 11 as described above. Further, a metal back 16 is coated on the upper surface of the fluorescent screen with a conductive thin film such as aluminum. The anode voltage is applied by the anode lead-out electrode 15 ₂ and the anode terminal 15 ₁ is to applied the metal back 16 was, it will function as an anode. That is, the electrons incident in the emission direction 23 from the cathode side are
After passing through 6, it collides with phosphor 17. Hereinafter, it is assumed that the phosphor 17 is a color phosphor and one pixel is constituted by R, G, and B.

In this manner, the metal back 16 is
7 is applied to the cathode so as to be covered with a thin film of aluminum, for example.
It is electrically connected to the anode terminal 15 ₁ via _two. Electrons emitted from the cathode penetrate through the metal back 16 to cause the phosphor 17 to emit light. Since the metal back 16 prevents the emitted electrons from accumulating negative charges on the fluorescent screen, the electrons from the cathode side can be sufficiently accelerated. Thereby, the emission luminance of the phosphor is improved. Further, since the metal back 16 is a mirror for the light emitted from the phosphor 17, the metal back 16 reflects the light to the cathode side and improves the light emission luminance of the front panel 11.

FIG. 4 is an enlarged view of a part 24 surrounded by a broken line in the main part of the image display device shown in FIG. The lower surface of the front plate 11 inside the envelope in FIG. 1 corresponds to the upper surface of the front plate 11 in FIG. Since the front plate 11 is a transparent plate made of glass, electrons incident on the metal back 16 pass through the metal back 16 and then collide with any one of R, G, and B of the phosphor 17. Then, since the coloring light is transmitted through the front plate 11 corresponding to each phosphor, the coloring by the phosphor 17 can be displayed on the front plate 11 of the envelope 10. Thus, the phosphor 1
7 can be displayed.

On the upper surface of the front plate 11 in FIG. 4 inside the envelope, a phosphor screen made of a phosphor 17 is formed, and a metal back 16 is applied so as to cover the phosphor screen. Meanwhile, black matrices 25, 26, and 27 made of a black substance such as carbon or metal are applied to the phosphor screen. These black matrices 25, 26,
Each of the phosphors 17 is arranged in a minute rectangular area surrounded by the other phosphors 27. By arranging the R, G, and B phosphors 17 in the arrow direction 2 in this order, one pixel is constituted. Each of the R, G, and B phosphors 17 is
This corresponds to one of the openings of the vertical address electrode 20 described above. These black matrices 25, 26, 27
Can reduce the reflectance as a whole of the fluorescent screen with respect to external light from the front surface, thereby increasing the contrast.

The upper end surface of the support wall 22 supporting the front panel 11 of the envelope shown in FIG.
Black matrix 26 extending in the direction of arrow 2 on the lower surface of 1
Is pressed against the part to which is applied. This allows
In the screen displayed via the front panel 11, the support wall 2
2 eliminates the influence of shadows, so that it is possible to increase the screen size and improve the image quality.

Next, the structure of the upper surface of the rear plate 13 inside the envelope will be described with reference to FIG. In the following, with reference to FIGS. 5 to 10, attention will be focused on the configuration of the cathode portion formed by the modulation electrode 18 and the vertical address electrode 20 in the envelope 10.

FIG. 5 shows an outline of the internal configuration of the envelope 10 shown in FIG. In FIG. 5, a light irradiator 14 is attached to the lower surface of the rear plate 13. On the other hand, on the upper surface of the rear plate 13, the modulation electrodes 18 are arranged in parallel with each other at a predetermined interval. Further above, the vertical address electrodes 20 are arranged in parallel with each other at a predetermined interval with an insulator 28 interposed therebetween. The vertical address electrode 20 has an opening at an intersection with the modulation electrode 18 disposed therebelow,
Each opening corresponds to one of R, G, and B of the phosphor 17 provided on the lower surface of the front plate 11 in FIG. On the upper surface of the modulation electrode 18, a film-shaped photocathode 29 is formed at a portion corresponding to the opening. Around the modulation electrode 18 and the vertical address electrode 20 arranged in this manner, four
The two side plates 12 are vertically arranged. Then, the upper end surface of the side plate 12 is joined to the edge thereof along each side of the lower surface of the front plate 11 so as to cover the front plate 11 from above. Thereby, the envelope 10 as a container is sealed, and the inside thereof is evacuated to be in a vacuum state.

Further, as the number of pixels increases and the screen size increases, the support wall 22 is arranged perpendicular to the rear plate 13 in order to increase the strength of the envelope 10 against atmospheric pressure. That is, the support wall 22 is disposed perpendicular to the respective plates such that the upper end surface and the lower end surface support the front plate 11 and the rear plate 13. The support wall 22 extends in the arrow direction 2, and a lower end surface is provided at a predetermined interval in a gap between the vertical address electrodes 20 which are also arranged in parallel to each other so as to also extend in the arrow direction 2. It is arranged to be. The upper end surface of the support wall 22 is pressed against a black matrix provided at the boundary of each of the R, G, and B of the phosphor 17 on the lower surface of the front plate 11 in FIG. The black matrix is necessary to improve the contrast with respect to the scattering of electrons emitted from the cathode side. However, the width of pressing against the black matrix 27 becomes substantially equal to the width of the upper end surface of the support wall 22, or By making the width narrower than that, the deterioration of the image quality due to the shadow of the support wall 22 is prevented. The other black matrix 25 extending in the arrow direction 2 can make the displayed screen brighter by making the width smaller than the width of the black matrix 27 to which the support wall 22 is pressed. The black matrix 26 extending in the arrow direction 1 is necessary to prevent color misregistration.

As described above, the support wall 22 arranged perpendicular to the rear plate 13 at a predetermined interval divides the area having a plurality of vertical address electrodes 20 into several areas. Since each of the divided areas is the same, attention will be paid below to the intersection.

FIG. 6 is an enlarged view of the photocathode provided at the intersection of the modulation electrode 18 and the vertical address electrode 20. In FIG. 6, on the upper surface of the rear plate 13, modulation electrodes 18 as transparent electrodes are arranged in parallel at a predetermined interval. Further, on the modulation electrode 18, the vertical address electrodes 20 are arranged in parallel with each other with an insulator 28 interposed therebetween, and a photocathode 29 is formed in a film shape at an intersection with the vertical address electrodes 20. . The vertical address electrode 20 is provided with openings at intersections with the modulation electrodes 18, and each opening is provided on the lower surface of the front plate 11 in FIG. 1 inside the envelope. 17 corresponds to any one of R, G, and B. Therefore, three apertures 30 surrounded by broken lines constitute one pixel. From each opening, electrons emitted by the photocathode are accelerated by an anode voltage and emitted as an electron beam to an anode formed on the lower surface of the front plate 11 in FIG. The emitted electron beam collides with the phosphor 17 to be colored.

That is, the light from the light irradiator 14 passes through the transparent rear plate 13 and the modulation electrode 18 which is a transparent electrode, and irradiates the photocathode 29. The photocathode 29 emits electrons when irradiated with light. In FIG. 1, the front plate 11 inside the envelope to which an anode voltage has been applied in advance, using the electrons emitted by the irradiation light as an electron beam.
Radiated toward the lower surface. At this time, by applying a desired control voltage to the modulation electrode 18 and the vertical address electrode 20, the amount of the electron beam emitted from the photocathode 29 and the characters, figures and images to be displayed can be represented. According to the control voltage applied to the vertical address electrode 20, electrons can be selectively emitted only for one scanning line. Also, the electrons selectively emitted by the vertical address electrode 20 can be modulated according to the control voltage applied to the modulation electrode 18. Further, since the potential difference between the anode electrode and the anode electrode can be adjusted by changing the voltage applied to the modulation electrode 18, the amount of electrons emitted to the anode can also be adjusted. Such a modulation electrode 18 is desirably formed of a thin film.

FIG. 7 shows the configuration of a cross section taken along line AA of the photocathode portion shown in FIG. That is, the modulation electrode 1 arranged on the upper surface of the rear plate 13 in FIG.
The vertical address electrode 20 is formed on the upper surface of the substrate 8 with an insulator 28 interposed therebetween. At the opening of the vertical address electrode 20, the surface of the photocathode 29 formed in a film shape on the upper surface of the modulation electrode 18 appears. Therefore, the light transmitted through the transparent rear plate 13 is further transmitted through the modulation electrode 18 which is a transparent electrode, and is irradiated on the photocathode 29. As a result, the photocathode 29 emits electrons, and modulation and addressing are performed by the modulation electrode 18 and the vertical address electrode 20.

FIG. 8 shows the configuration of a cross section taken along line A'-A 'of the photocathode portion shown in FIG. That is, on the upper surface of the modulation electrode 18 arranged on the upper surface of the rear plate 13 in the figure, the vertical address electrode 20 is formed with the insulator 28 interposed. Vertical address electrode 20
The photocathode 29 is not formed except for the opening of FIG.

FIG. 9 shows a cross-sectional configuration of the photocathode portion shown in FIG. 6 along the line BB. That is, the modulation electrode 1 arranged on the upper surface of the rear plate 13 in FIG.
The vertical address electrode 20 is disposed on the upper surface of the gate electrode 8 with an insulator 28 interposed therebetween. A support wall 22 made of an insulator is arranged perpendicular to the rear plate 13 between the vertical address electrodes 20 arranged at a predetermined interval in this manner. The support wall 22 has its lower surface on the rear plate 13,
Conversely, the front plate 11 and the rear plate 13 are supported by being arranged such that their upper surfaces are joined to the front plate 11. Such support walls 22 are arranged at appropriate intervals in order to increase the strength against the pressure difference due to the atmospheric pressure with the envelope 10 whose inside is exhausted.

FIG. 10 shows the configuration of a cross section taken along the line B'-B 'of the photocathode portion shown in FIG. That is, the vertical address electrode 20 is disposed on the upper surface of the modulation electrode 18 disposed on the upper surface of the rear plate 13 with the insulator 28 interposed therebetween. The support wall 22 is arranged perpendicular to the rear plate 13 between the vertical address electrodes 20 arranged at a predetermined interval as described above.

In the image display device having the above configuration,
The light emitted from the light irradiator passes through the back plate 13 and the modulation voltage 18 which is a transparent electrode, and
Is to be irradiated. Photo cathode 29
Is accelerated by an anode voltage previously applied to a fluorescent screen formed on the lower surface of the front plate 11 in FIG. 1 inside the envelope to emit electrons when irradiated with light, and It is emitted as an electron beam to the anode. At this time, modulation and addressing are performed by the control voltage applied to the modulation electrode 18 and the vertical address electrode 20.

FIG. 11 summarizes the state of electron emission by the voltage applied to the modulation electrode and the vertical address electrode.
That is, electrons are emitted only from the photocathode in the opening where the vertical address electrode 20 is 0 [V] and the modulation electrode 18 is +5 [V]. -25 for other vertical address electrodes
When [V] is applied and +20
When [V] is applied, electrons are confined near the cathode, so that no electrons are emitted to the anode. The electron beam is vertically scanned by designating the position where electrons are emitted in the vertical direction by the vertical address electrode 20, and the emitted electrons are modulated by the modulation electrode 18 based on image information. Thus, the modulation electrode 18
By controlling the voltage applied to the vertical address electrode 20, it is possible to modulate and address electrons from the photocathode at the desired opening.

Next, the outline of the method of manufacturing the image display device in the present embodiment described above will be described.

FIG. 12 shows an outline of a manufacturing procedure of the image display device in the present embodiment. First, back plate 1
3 and the front plate 11 are manufactured in parallel (manufacturing process 4).
1, 42), and thereafter, the rear panel 13 and the front panel 11 are joined to form an image display device having the envelope 10.

First, the manufacturing process 41 of the rear plate 13 will be described. In FIG. 1, a transparent electrode made of ITO is attached to the upper surface of the transparent rear plate 13 made of a glass material by sputtering (step S42). Next, the upper surface is patterned by using an etching technique so as to form a desired pattern as the modulation electrode 18 (step S43). Before forming the vertical address electrode 20 on the upper surface of the modulation electrode 18, a thick film printing of the insulator 28 is performed for electrical insulation (step S44). By performing thick film printing, a masking process for performing patterning is not required.
Next, thick film printing of the vertical address electrode 20 is performed in the same manner (step S45). Next, the preformed support wall 22 is set in a mold, and frit glass is thinly applied to the bottom surface. Then, in order to arrange the support wall 22 vertically between predetermined vertical address electrodes, the support wall 22 is sintered in an electric furnace and finally the mold is removed (step S46). Frit glass is thinly applied to the upper end surface of the side plate 12 and calcined (step S4).
7). Then, the vertical address electrodes 20 are masked,
The material of the photocathode 29 is deposited (Step S4)
8).

Next, the manufacturing process 42 of the front plate 11 will be described. In FIG. 1, a black matrix is formed on one surface of a transparent front plate 11 made of a glass material by applying a black substance or printing a thick film (step S49). Thick film printing of the phosphor 17 is performed on the upper surface of the black matrix (step S50). Further, the anode extraction electrode 1
5 ₂ Paste on the thick film printing (step S51), the last 3
The metal back 16 is deposited as shown by (step S52).

In order to install the envelope 10 using the rear plate 13 and the side plate 11 manufactured as described above, the upper end surface of the side plate 12 is joined to the surface of the front plate 11 on which the fluorescent screen is formed. Then, the front plate 11 is placed, and finally, weighted and sintered in an electric furnace to join the front plate 11 and the rear plate 13 (Step S53). Next, the inside of the installed envelope 10 is evacuated to vacuum, and then baked and sealed. Finally, the light irradiator 14 is attached to the lower surface of the rear plate 13 in FIG. 1 (step S54).

As described above, the image display device according to the present embodiment is arranged such that a plurality of modulation electrodes 18 and a plurality of vertical address electrodes 20 arranged in a lattice form intersect in the envelope 10 in a vacuum state. A photocathode 29 is formed on the upper surface of the modulation electrode 18, and the vertical address electrode 20
Are provided. In FIG. 1, a fluorescent screen is formed on the lower surface of the front plate 11 inside the envelope, and an anode is provided. In FIG. 1, a light irradiator 14 is attached to the lower surface of the rear plate 13 outside the envelope 10. The light emitted from the light irradiator 14 that has been transmitted through the rear plate 13 of the transparent envelope is also transmitted through the modulation electrode 18 of the transparent electrode, and is irradiated on the photocathode 29 described above. The photocathode 29 emits electrons when irradiated with light. The position at which electrons are emitted is designated by the voltage applied to the vertical address electrode 20, scanning is performed for one scanning line, and the emitted electrons are modulated by the modulation electrode 18. The electrons that have been addressed and modulated in this way are transferred to the envelope 1
The color is accelerated by the anode voltage provided on the inner surface of the phosphor and collides with the phosphor to form a color. This color is transmitted through the transparent front panel 11 of the envelope 10 facing the rear panel 13 and is displayed outside as an image.

Since such an image display device can keep the drive voltage low, it can be easily applied to an IC and can be applied as a wall-mounted television with low power consumption and low cost. Further, since the image display device can be made thinner, it can be applied as a monitoring television.
Other applications currently used as televisions include:
It can be applied with no inferiority.

The front plate 11 and the rear plate 13 of the image display device in this embodiment are transparent plate members made of glass having a thickness of about 3 mm, and the thickness of the support wall 22 is set to about 0.2 mm.
However, the present invention is not limited to these thicknesses. It is appropriately selected according to the number of pixels, the size of the screen, and the number of modulation electrodes or vertical address electrodes.

In this embodiment, in order to increase the strength of the envelope 10 in which the inside is in a vacuum state, the front plate 11 and the rear plate 1
3 and the support wall 22 is arranged perpendicular to the rear plate 13 in parallel with the vertical address electrode 20. However, the present invention is not limited to the support wall. For example, a support having a rectangular parallelepiped shape may be used such that the upper end surface and the lower end surface are joined to the front plate 11 and the rear plate 13 throughout the envelope 10. It is sandwiched so that it is arranged, and its upper end surface is the front plate 1
A support that is in pressure contact with the black matrix on the inner surface may be used. As described above, the support wall 22 or the support is appropriately selected based on a trade-off based on manufacturing cost.

Further, in the present embodiment, the vertical interval of the support wall 22 is not specified, but it is appropriately selected according to a trade-off between the size of the display screen, the image quality, and the cost. .

Further, in this embodiment, the anode terminal 15 ₁
Was mounted as an electrode having a U-shaped cross section, but in FIG. 1, a plate-shaped anode extraction electrode was embedded in the front plate 11 near the rear corner, and this was inserted through the lower surface. To be electrically connected to the anode. That is, the mounting method of the anode extraction electrode 15 is not limited.

Further, in the present embodiment, the phosphor 17 is described as a color, but the present invention is not limited to this, and a monochrome phosphor may be used.

Note that, in FIG.
Is formed only in a portion overlapping with the opening of the vertical address electrode 20. However, the pattern is formed on the upper surface of the modulation electrode 18 in FIG. it can.

[0067]

As described above, according to the first aspect of the present invention, since the light irradiating means irradiates the electron emitting means with the first plane plate interposed therebetween, a fluorescent screen is formed. The configuration can be made so as to be most distant from the second flat plate, so that the maintenance of the light irradiating means becomes easy and the configuration of the image display device can be simplified. Therefore, the manufacturing method is simplified, and cost reduction can be realized.

According to the second aspect of the present invention, the light irradiated by the light irradiating means is transmitted through the first flat plate, and the transmitted light is irradiated on the electron emitting means.
Further, the second flat plate has a fluorescent surface formed on the surface facing the first flat plate, and transmits the colored light on the inclined surface. Then, after the electrons emitted by the electron emitting means are selectively emitted only for one scanning line by the electron emitting position selecting means, the electrons are selected and modulated for each color forming unit of one pixel based on the image information, and the fluorescent light is emitted. An electron beam is emitted to the surface. Thus, the configuration of the image display device can be simplified, and fine control can be performed for each pixel. Therefore, it is possible to provide a high-quality and low-cost image display device.

According to the third aspect of the present invention, the first
The electron emission means and the electron modulation means between the flat plate and the second flat plate are provided in a vacuum, and the light irradiation means is provided outside the vacuum, so that the control of the electron beam and the light irradiation means can be performed. Easy maintenance. That is, a highly reliable image display device can be provided.

Further, according to the fourth aspect of the present invention, the structure of the image display device can be simplified by sandwiching the first flat plate and the second flat plate of the image display device with the support. In addition to this, it is possible to contribute to a large-sized flat display. Therefore, the manufacturing method of the large-sized flat display becomes easy, and the cost can be reduced. By providing a plurality of supports, it is possible to further prevent damage to the image display device due to the atmospheric pressure.
The thickness can be reduced to about 20 mm.

Further, according to the fifth aspect of the present invention, by making the press-contact width of the support smaller than the width of the black matrix, the influence of the shadow by the support is eliminated, and a larger flat display and its height are reduced. Brightness can be easily realized.

According to the sixth aspect of the present invention, a black matrix other than the black matrix to which the support is pressed is made narrower than the width of the black matrix to which the support is pressed, so that the displayed screen can be displayed. You will be able to brighten.

According to the seventh aspect of the present invention, the amount of the electron beam emitted by the electron emitting means can be easily changed, so that a detailed image can be displayed.

According to the eighth aspect of the present invention, the thickness of the image display device can be defined by the opposing width of the first flat plate and the second flat plate, so that the configuration is simplified. And a thin image display device can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view in which a main part of an image display device according to an embodiment of the present invention is partially cut away, and arrow directions 1 and 2 that intersect at right angles are shown as depth directions.

FIG. 2 is a plan view showing an outline of a configuration of a front plate 11 of an envelope 10 in the embodiment.

FIG. 3 is a configuration diagram illustrating an outline of a configuration of an inner surface of a front plate 11 of an envelope 10 in the present embodiment.

FIG. 4 is a configuration diagram showing an enlarged outline of the configuration of the inner surface of the front plate 11 of the envelope 10 in the present embodiment.

FIG. 5 is an assembly diagram showing an outline of an internal configuration of an envelope 10 in the embodiment.

FIG. 6 is an enlarged perspective view showing an outline of a configuration of a photocathode portion in the present embodiment.

FIG. 7 is a sectional view taken along line AA of the perspective view shown in FIG. 6;

8 is a sectional view taken along line A′-A ′ in the perspective view shown in FIG. 6;

FIG. 9 is a sectional view taken along line BB of the perspective view shown in FIG. 6;

FIG. 10 is a sectional view taken along line B′-B ′ of the perspective view shown in FIG. 6;

FIG. 11 is an explanatory diagram for explaining a state of electron emission by a modulation electrode and a vertical address electrode in the present embodiment.

FIG. 12 is a flowchart illustrating an outline of a manufacturing procedure of the image display device in the present embodiment.

[Explanation of symbols]

Reference Signs List 10 envelope 11 front plate 12 side plate 13 rear plate 14 light irradiator 15 ₁ anode terminal 15 ₂ anode lead electrode 16 metal back 17 phosphor 18 modulation electrode 19 modulation lead electrode 20 vertical address electrode 21 vertical address lead electrode 22 support wall

Claims (8)

[Claims] 1. A light irradiation means for irradiating light, and a first light transmitting means for transmitting light irradiated by the light irradiation means.
A flat plate; an electron emitting unit that emits electrons by irradiating light transmitted through the first flat plate; an electron modulating unit that modulates the electrons emitted by the electron emitting unit based on image information; An image display device, comprising: a second flat plate that transmits colored light of a phosphor screen formed on the incident surface by incidence of electrons modulated by the electronic modulation means. 2. A light irradiating means for irradiating light, and a first light transmitting means for transmitting the light irradiated by the light irradiating means.
A second flat plate that transmits color light of a fluorescent screen formed on a surface facing the first flat plate; and a light that is transmitted through the first flat plate. Electron emitting means for emitting electrons, electron emitting position selecting means for selectively emitting only one scanning line of electrons emitted by the electron emitting means, and electrons selectively emitted by the electron emitting position selecting means as image information. Image modulating means for selecting and modulating each of the color units of one pixel based on the image, and radiating as an electron beam to the phosphor screen formed on the second flat plate. apparatus. 3. The image display device according to claim 1, wherein a region sandwiched between the first flat plate and the second flat plate is kept in a vacuum state. 4. The image display device according to claim 3, wherein the first flat plate and the second flat plate are sandwiched by a support. 5. A black substance is applied as a black matrix around each of the phosphors on the phosphor screen formed on the second flat plate so as to be separated from an adjacent phosphor, and the support is formed of a black matrix. 5. The image display device according to claim 4, wherein the second flat plate is pressed against the black matrix with a width smaller than the width of the matrix. 6. The image according to claim 5, wherein the black matrix other than the black matrix pressing the support is formed to be narrower than the pressing width of the support. Display device. 7. The electron modulating means selects electrons emitted by the electron emitting means for each color forming unit of one pixel on the basis of image information, and applies the electrons to a phosphor screen formed on the second flat plate. 3. The image display device according to claim 2, wherein the amount of the electron beam emitted is adjusted. 8. The image display according to claim 1, wherein the first flat plate and the second flat plate form a part of a wall forming a sealed container. apparatus.