JP3424703B2 - Light emitting device and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device and a manufacturing method thereof, for example, a field emission display device and a manufacturing method thereof.

[0002]

2. Description of the Related Art A field emission display device (FED: Field Em)
As an ission display), for example, as shown in FIG. 19 which is an exploded perspective view, a fluorescent surface panel 14 in which red, green and blue fluorescent materials R, G and B are arranged in a stripe shape on a glass substrate 24.
And the rear panel 16 are opposed to each other with a predetermined gap. As shown in the enlarged view of FIG. 20, the rear panel 16 is orthogonal to the cathode line 17 on which a microchip cathode 21 is formed as a field emission type cathode on the glass substrate 26 and the cathode line 17 via the insulating layer 18. And the gate electrode line 19 arranged in a line.

Both substrates 24 and 26 are several hundreds of μm, for example 300 μm
Are facing each other with a certain gap of, and the periphery of the screen area is
Joined via a glass frit seal (not shown),
The inside is kept in an ultra-high vacuum of 10 ^-4 to 10 ^-7 Pa.

In the field emission display device having such a structure, generally, a voltage is applied between the cathode and the gate electrode so that an electric field of 10 ⁸ to 10 ⁹ V / m is applied to the surface of the cathode, and the microchip cathode is used. An electron beam is emitted from the tip of 21 through the cathode hole 20 by the tunnel effect, and a potential is sequentially applied between the cathode and the gate electrode, which are arranged in a matrix corresponding to the electron beam, to the selected fluorescent stripes R, G, B. The emitted electron beam is shined on to display an image.

By the way, when the space between the cathode side substrate 26 and the phosphor side substrate 24 of the field emission type display device is set to a high vacuum as described above, a large pressure of 1 kg / cm ² is generated due to the atmospheric pressure. Join the display. In order to counteract this pressure in the field emission display device, assuming that a vacuum pressure holding structure is not provided between the cathode side substrate 26 and the fluorescent surface side substrate 24, the thickness of the glass plates of both substrates 26, 24 is The height must be tens of millimeters.

However, if the glass plate has such a thickness, it is not possible to make the field emission display device thin and lightweight. Therefore, in order to make the thickness of the glass plates of both substrates 26 and 24 about 1 mm and to withstand the atmospheric pressure, a vacuum pressure holding structure is provided between both substrates 26 and 24. Therefore, it is necessary to dispose columnar or block-shaped spacers for holding the vacuum breakdown voltage between the substrates 26 and 24 at intervals of about several mm.

Such a spacer is resistant to compressive stress, can withstand an atmospheric pressure of about 1 kg / cm ² , and can support the field emission device with a uniform thickness over the entire surface.
It is necessary that it does not affect the trajectory of the electron beam emitted from the cathode, that it emits little gas, is stable in a vacuum, and that it can withstand high-temperature processing during frit sealing and baking.

The inventor of the present invention is effective to form a spacer, which serves as a vacuum withstand voltage structure of a field emission display device, by stacking glass paste on the substrate on the phosphor side by screen printing. We have found this and already proposed it (Japanese Patent Laid-Open No. 5-325843).

However, in order to prevent the image quality from deteriorating on the phosphor side substrate, the spacers dispersed and fixed in an island shape are used at the atmospheric pressure at the time of manufacturing the fluorescent surface panel 14 and at the time of evacuation after being constructed as a vacuum container. Sometimes, it was peeled off from the fluorescent substance side substrate 24 and collapsed due to the load. The collapse of the spacer in the vacuum container and the generation of dust due to this
This may cause deterioration in vacuum withstand voltage characteristics and discharge damage. Such a problem is particularly serious when the pixels have a fine pitch. As a result, it was found that the above-mentioned invention of the prior application still had problems to be solved.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is high in that the spacer is not peeled or collapsed due to atmospheric pressure after the manufacturing process of a fluorescent surface panel or after assembly. It is an object of the present invention to provide a light emitting device that can be manufactured with high productivity, high quality and high reliability, and a manufacturing method thereof.

[0011]

According to the present invention, a first base body provided with a light emitting body and a second base body face each other with a predetermined gap therebetween, and a spacer is provided for holding the predetermined gap. In the light emitting device, a base layer (for example, base layers 8 and 28 described later) on the non-light emitting portion of the first substrate where the light emitter does not exist, and a spacer body on the base layer (for example, 8). A spacer (for example, a spacer 10 described below) which is directly integrated with a portion (for example, a spacer main body 9 described below) by laminated printing, and the base layer has a larger area than the spacer main body. The light emitting device is characterized in that the base layer and the spacer body are provided over the entire length of the base layer and the spacer body is made of an insulating material.

[0012]

In the above, it is desirable in manufacturing that the base layer and the spacer body are provided in separate steps.

Further, in the present invention, it is desirable that the spacer main body is made of the same material as the base layer. However, the spacer body and the base layer may be formed of different materials.

Further, in the present invention, it is desirable in view of mechanical strength that the spacer main body and the base layer are integrally formed by firing.

Further, in the present invention, it is desirable that the underlayer is composed of a black mask formed by using a black glass paste in order to improve the contrast.

Further, in the present invention, it is advantageous in manufacturing that the underlayer is formed by printing and the spacer main body is formed by laminated printing.

Further, in the present invention, it is possible to adopt a structure in which a plurality of light emitting bodies are provided in a stripe shape and a base layer is provided in a stripe shape between the light emitting bodies.

Further, in the present invention, it is desirable from the viewpoint of color emission and pressure resistance that spacers are provided for each predetermined number of groups of light-emitting bodies consisting of light-emitting bodies of a plurality of colors.

Further, in the present invention, it is desirable to provide a light emitting body on the optically transparent first substrate through a transparent electrode in order to cause the light emitting body to emit light.

In the present invention, the second substrate may be provided with a particle emission source, and the particles emitted from the particle emission source may cause the light-emitting body of the first substrate to emit light.

In the above, a field emission type display device in which the particle emission source is a field emission type cathode can be constructed.

Further, in the present invention, it is desirable that the light emitting body is a fluorescent body from the viewpoint of responsiveness.

According to the present invention, in manufacturing the above-mentioned light emitting device, a step of forming a base layer in a predetermined pattern on a first substrate using a first mask, and a step different from the first mask. And a step of forming a spacer main body on the base layer using a second mask in an area smaller than the base layer so as to be directly integrated with the base layer by laminated printing. It is provided.

In the method for manufacturing a light emitting device according to the present invention, the base layer is formed by printing, the spacer main body is formed by laminated printing, and the base layer and the spacer main body are baked and integrated to form a spacer. It is desirable to do.

In the method for manufacturing a light emitting device according to the present invention, an electrode is formed on the light emitting portion on the first substrate prior to the step of forming the underlayer, and then the spacer body is formed on the underlayer. The parts can be formed and these can be fired to integrate them, after which a light emitter can be provided on the electrodes.

[0027]

According to the light emitting device of the present invention, the base layer and the spacer body on the base layer are directly integrated to form a spacer, and the base layer is provided over a larger area than the spacer body. Therefore, not only can appropriate materials be selected for both materials, but also the spacer can be made strong so that peeling or collapse does not occur.

Since the spacer main body which is responsible for the vacuum withstand voltage structure of the light emitting device of the present invention can be formed by laminating and coating glass paste on the light emitter side substrate, for example, by screen printing, the height of the spacer and the spacer main body and the underlying layer are The width can be defined independently. Therefore, while the height of the spacer is determined according to the distance between the first base and the second base, the pitch of the spacer main body can be narrowed according to the pitch of the underlying black stripes, that is, the pixel pitch. . Therefore, it is possible to improve the contrast ratio and the image quality when the pixels of the light emitting device have a fine pitch.

Further, since the spacer main body is formed by, for example, layer coating by the screen printing method, it can be formed into a desired shape with high productivity. That is, the height of the spacer body can be easily formed to a desired size by increasing or decreasing the number of times of coating, and each spacer can be formed to have a uniform height. Spacer body width is 50 μm
It becomes possible to form a pattern having a narrow width.

Further, as the glass paste used for such screen printing, a frit material used for adhering a CRT (cathode ray tube) can be used, so that the spacer formed by this has little gas emission and is stable in a vacuum. Therefore, it can withstand high temperature treatment during frit sealing and baking. It is also possible to add various functional additives to the glass paste.

Further, since the spacer can be formed on the first substrate by, for example, screen printing, it does not contaminate the second substrate (for example, the cathode side substrate) at the time of forming the spacer, which may adversely affect the field emission process. Absent.

[0032]

EXAMPLES Examples of the present invention will be described below.

1 to 15 show an embodiment in which the present invention is applied to a high-definition color field emission display device.

(Outline of FED Panel) First, FIG. 11 to FIG.
With respect to, a configuration of an FED (field emission display device) will be schematically described.

In the FED, electrons are taken out by using a so-called Spindt type field emission type microtip cathode (emitter cone) having a small size of the cathode of about several μm or less, and the electrons are taken out on the surface of the fluorescent body. It is a thin flat display device that emits light by performing accelerated irradiation.

FIG. 11 shows an exploded perspective view as an example thereof. In this FED, for example, R (red), G
Each of the three primary color phosphor elements (green) and B (blue) is made of ITO (In
and a light-transmissive fluorescent surface panel 14 in which a color fluorescent surface 23 is formed by being arranged in a stripe pattern through transparent electrodes 1R, 1G, 1B made of (indium and tin mixed oxide) or the like. , A rear panel 16 on which an electrode structure 15 having a field emission type cathode (emitter cone) 21 (see FIG. 13) is formed is hermetically sealed by a sealing material (for example, a glass wall 29 described later), and a predetermined vacuum is applied. Holds every time.

The rear panel 16 comprises a substrate 24 made of glass and a cathode electrode 17, an insulating layer 18, and a gate electrode 19 deposited in this order. The insulating layer 18 is made of silicon dioxide (SiO 2
₂ ), the electrodes 17, 19 are made of chromium, and the emitter cone 21 is made of molybdenum.

The fluorescent surface panel 14 and the rear panel 16 are sealed via a column (spacer) 10 having a predetermined height in order to keep the distance between them constant. The spacers 10 are provided in every trio (TRIO) or trio of trios of the phosphor elements R, G, B of the three primary colors within the range where the breakdown voltage can be maintained.

In the electrode structure 15, strip-shaped cathode electrodes 17 extending in the direction indicated by the x-axis in FIG. 11 are arranged in parallel on the inner surface of the rear panel 16 in a stripe shape, and insulation is provided on these cathode electrodes 17. Cathode electrode 17 through layer 18
Band-shaped gate electrode in the y-axis direction that is substantially orthogonal to the extension direction of
19 are arranged in parallel in stripes.

FIG. 12 is a schematic perspective view showing a procedure for joining the fluorescent surface panel 14 and the rear panel 16 shown in FIG.
A large number of driving IC chips 31 are provided on the rear panel 16, and the IC chips 31 are driven by a signal sent from a host computer 33 via an interface boat 32 to selectively apply a voltage to each electrode in FIG. Then, the display is made.

Then, each cathode electrode 17 and gate electrode 19
For example, a plurality of cathode holes 20 having a predetermined opening width w are formed at the intersections 22 with each other so as to correspond to the phosphor elements of the three primary colors indicated by R, G, and B on the fluorescent surface. ing. In the through holes 18a formed in the insulating layer under the cathode holes 20, on the cathode electrodes 17, for example, as shown in the schematic enlarged perspective view of the main part of FIG. Deposited and formed electrode structure
15 are made up.

As a method of performing color display by the FED, a method of associating each cathode of the selected intersection 22 with a phosphor of one color and a method of associating each cathode with a phosphor of a plurality of colors. There is a so-called color selection method. The color selection operation in this case will be described with reference to FIGS. 14 and 15.

In FIG. 14, R, G, and B phosphors corresponding to respective colors are sequentially arranged and formed on a plurality of stripe-shaped transparent electrodes 1 on the inner surface of the fluorescent surface panel 14, and electrodes of respective colors are formed. Are led out by collecting terminals of 3R for red, 3G for green, and 3B for blue, respectively.

On the back panel 16 facing each other, the cathode electrodes 17 and the gate electrodes 19 are provided in the form of stripes orthogonal to each other as described above.
When an electric field strength of 10 ⁸ to 10 ⁹ V / m is applied between them, electrons e are emitted from the emitter cone 21 formed at the intersection 22 of each electrode.

On the other hand, the transparent electrode 1 (that is, the anode electrode)
A voltage of 100 to 1000 V is applied between the cathode and the cathode electrode 17 to accelerate the electrons and cause the phosphor to emit light. In the example of FIG. 14, the voltage is applied only to the red fluorescent substance R, and the electron e
Shows the case of acceleration as indicated by the arrow.

As described above, the colors R, G, and
Color display can be performed by selecting B in time series. NTS of one point cathode, gate and anode (fluorescent stripe) on each cathode electrode row
FIG. 15 shows a color selection timing chart in the C method.

When each cathode electrode 17 is line-sequentially driven at a period of 1H, each of the color phosphors R, G, and B is provided with a signal of + hV by H / 3 in the period H, while the gate signal and the cathode are supplied. Signals are given in synchronization with + αV as a gate signal and −αV to −βV as a cathode signal in H / 3 cycles, and electrons are emitted when the gate-cathode voltage V _PP = + 2αV, and every H / 3. R, G, B selected
It is possible to perform color selection by emitting light from each of the phosphors, and thereby full color display can be performed.

What should be noted in this embodiment is that FIG.
, The transparent electrode 1 and the R, G, and
An underlayer 28 is provided between B and one red, one green and one blue
The trio (TRIO) is that the base layer is formed into a wide base layer 8 every 3 TRIO, the spacer main body 9 is provided thereon, and the base layer 8 and the spacer main body 9 form the spacer 10.

The base layer 8 is wider (larger area) than the spacer body 9 to make the spacer 10 stable.
Thus, the fluorescent panel 14 and the rear panel 16 provided with the electrode structure 15 are kept at a predetermined gap by the spacer 10. The base layers 8 and 28 function as black stripes. By covering the non-light emitting portions (particularly the regions between the respective fluorescent elements) with the underlayers 8 and 28 to form black stripes, the contrast is improved and a good color display is achieved.

FIG. 2 is an enlarged partial front view of the image display portion (area where the fluorescent body exists) 30A of the fluorescent surface panel 14 as seen from the rear panel side.

A base layer 8 is provided in stripes between blue and red for every 3 TRIO of red, green and blue, and a spacer body 9 is provided upright at the end thereof. In this example, 1 TRIO
Therefore, the spacers 10 are provided at a pitch of 1.2 mm shown by P ₁ for every 3 TRIO.

Generally, in the FED, the ratio of the total length in the direction of the pitch P ₁ to the total length in the stripe direction orthogonal thereto is 4: 3, and the pitch P of the spacer main body portion 9 on each base layer 8 is set. According to this, _{2 is} also set to 0.9 mm, for example. Thus, the image display unit 30A is provided with the spacers 10 at a pitch of, for example, 1.2 mm, for example, a pitch of 0.9 mm, in the directions orthogonal to each other.

FIG. 3 is an enlarged plan view of the fluorescent surface panel 14 viewed from the rear panel side, and FIG. 4 is a sectional view taken along line IV-IV of FIG. Each TRIO is arranged in n columns and x rows, and has A1
TRIO to AnTRIO is row A, B1TRIO to Bn
TRIO indicates an area of B row, and x1 TRIO to xn TRIO indicate an area of each TRIO of x row.

At the entire edge of the glass substrate 24 of the fluorescent surface panel 14, a sealing glass wall 29 for keeping a space between the rear panel and the back panel in a high vacuum is erected by adhesion, and The base layer 8 is provided in a region between the glass wall 29 and the glass wall 30 and away from the glass wall 29. In this region of the base layer 8, a spacer body 9 (see FIG. 1) is provided upright to form a spacer 10. In this region, three rows of spacers 10 are provided in the direction orthogonal to the fluorescent stripes, and four rows of spacers 10 are provided in the direction parallel to the fluorescent stripes.

A region consisting of the base layer 8 provided with these spacers 10 and the image display portion 30A inside thereof is
It is called the whole display section (denoted by reference numeral 30B). In a region 30C between the entire display portion 30B and the glass wall 29, an electrode driving IC chip (31 in FIG. 12) is located opposite.

As can be seen from FIGS. 3 and 4, the spacer 10
4 are provided in a region other than the image display unit 30A in the entire display unit 30B, and are also provided at a predetermined pitch (1.2 mm pitch, 0.9 mm pitch in this example) in the image display unit 30A. Even if the space between the rear panel 16 and the phantom line is made high vacuum, the distance between the two substrates 24 and 26 is kept constant while withstanding the atmospheric pressure. In FIG. 3, the dimensions of the entire display unit 30B are 8 inches horizontally and 6 inches vertically.

Next, the procedure for manufacturing the fluorescent surface panel will be described.

First, as shown in FIG. 5, transparent electrodes of ITO are formed in stripes on the glass substrate 24 by a usual photolithography technique. This transparent electrode has a reference numeral 1R or 1R depending on the color of the fluorescent element to be deposited thereon.
It is represented by G and 1B.

Next, as shown in FIG. 6, the printing mask 34 is used.
And align the underlayer 8 and 28 by screen printing.
To form. It is dried every time this screen printing is performed, and this is repeated until the underlying layers 8 and 28 have a predetermined thickness. However,
Depending on the thickness of the underlying layers 8 and 28 (when thin), this screen printing can be performed once.

Next, the mask 34 is replaced with another mask 35 for printing, the mask 35 is aligned as shown in FIG. 7, and the spacer body 9 is formed by screen printing. Similarly to the above, each time screen printing is performed, the spacer main body 9 is dried, and the spacer main body 9 is made to have a predetermined thickness.

By repeatedly forming the spacer main body by screen printing and drying, the spacer main body can be easily and accurately made to have a predetermined height. This is because the coating layer having a thickness of several μm to several tens of μm is formed by one screen printing. Further, since the spacers are formed by screen printing, the rear panel side is not contaminated during this formation, and the field emission process is not adversely affected.

Next, the base layer 28 is solidified by, for example, firing at 580 ° C., and the base layer 8 and the spacer body 9 are integrated and solidified to form spacers 10. Spacer body 9
Is provided on the base layer 8 wider than this, so that the spacer 10 is stable, and damage such as peeling or breakage during the printing of the fluorescent material, the subsequent printing of the fluorescent material, the FED assembly or the use of the FED is prevented. There is no danger of causing it.

In this example, the same raw materials are used for the base layers 8 and 28 and the spacer body 9. This raw material includes
B ₂ O ₃ -PbO-ZnO and B ₂ O ₃ -PbO-SiO
_A glass paste obtained by dispersing a frit material such as _{2 in} a binder such as ethyl cellulose can be preferably used.

Such a glass paste is applied 150 times after application.
After drying or semi-drying at a temperature of about ℃, 500 to 600 ℃
When baked at a temperature of about a certain degree, organic substances are completely decomposed to become inorganic and become a stable substance with little gas emission in vacuum.
Also, a mask for screen printing (screen printing plate)
For example, a stainless steel mesh screen or the like can be used.

In the printing process, as shown in FIG. 6, a screen plate 34 having a stripe pattern and a black glass paste (G3-0428: Okuno Chemical Industries Co., Ltd.) were used to print on the substrate 24 and dried at 150.degree. Let Next, using a screen plate having a spacer pattern and a black glass paste (same as above), alignment is performed on the stripe pattern layer, and printing and drying are performed. Then, as shown in FIG.
The alignment, printing, and drying of the screen printing plate 35 are repeated until the spacer has a desired height, and then, for example,
The underlayer and the spacer body are integrated by firing at 580 ° C.

In the method according to the present invention, the spacers are formed on the substrate 24 by the screen printing method as described above. The formation of such spacers is performed before the fluorescent substances are formed in stripes on the substrate 24. Is the most suitable.

Next, as shown in FIG. 8, the phosphor elements R, 1G, 1B are provided between the underlayers 8, 28 on the transparent electrodes 1R, 1G, 1B, respectively.
G and B are formed. The formation of the fluorescent element is performed by the electrodeposition method described later.

Next, the glass wall 29 is adhered to the edge portion of the substrate 24 to form the fluorescent surface panel 14 shown in FIG.

The above-mentioned step of forming the spacer is shown in the flow chart of FIG. The figure (a) shows a base layer formation process, and the figure (b) shows a spacer main body part formation process.

The underlayer and the spacer body can be made of different materials as long as they have the same coefficient of thermal expansion. In this case, the underlayer is preferably made of a material that is mechanically stronger than the spacer body. However, the base layer 8 and the spacer body 9 are integrated by firing to form the spacer 10. FIG. 10 is a sectional view of the FED thus constructed, similar to FIG.

Next, a method of forming a fluorescent element (film) on the transparent electrode by electrodeposition will be described with reference to FIGS.

First, as shown in FIG. 16, the panel 14 is placed in the electrodeposition tank 11 in which the fluorescent powder of a desired color is dispersed, and the stirrer 13
Electrodeposition of the red, green and blue phosphors is sequentially performed on the striped transparent electrodes corresponding to each color under uniform agitation by the above method. In addition to the case of using the stirrer 13, stirring may be performed by pump circulation using a stirring blade or a motor.

That is, first, for example, a panel as shown in FIG. 7 is provided with an electrodeposition tank containing an electrodeposition liquid 12 in which red fluorescent powder is dispersed.
Put in 11. Then, in the water-soluble or non-water-soluble electrodeposition liquid 12, the electrode not coated with the fluorescent substance (in this case, 1G and 1B)
0, or an electrode that deposits this phosphor (1R in this case)
A reverse bias voltage is applied.

As a method of forming such a transparent electrode 1, after the stripe-shaped transparent electrodes 1 are sequentially deposited and formed,
The electrodes corresponding to the same color can be formed by commonly connecting them. That is, first, a transparent conductive layer such as ITO is deposited on the entire surface, and then a photoresist is coated on the entire surface, and a proximity exposure method, a contact exposure method, a stepper method, or the like using a stripe-shaped chrome mask pattern or the like. After exposure by, through development, etching and resist stripping process,
For example, the stripe-shaped transparent electrode 1 in which 1R, 1G, and 1B are sequentially formed corresponding to red, green, and blue is formed.

Reference numerals 3R, 3G and 3B denote terminals led out corresponding to red, green and blue, respectively, and one electrode of each transparent electrode 1 is formed to be extended as compared with the other electrodes. Constitute. In this example, each terminal is derived from the left end for each trio of red, green, and blue, but the derivation position is not limited to this, and the interval is 2
Various modifications are possible, such as each trio.

Then, the fluorescent panel 14 having the transparent electrode 1 thus formed is placed in the electrodeposition tank 11 in which the electrodeposition liquid 12 in which the fluorescent powder of a desired color is dispersed is injected into the electrodeposition tank 11 as shown in FIG. Arranged as shown, the red, green and blue color phosphors are sequentially electrodeposited on the transparent electrode 1 corresponding to the color of the phosphor powder.

The fluorescent substance is, for example, red Y ₂ O.
₂ S: Eu, CdS, etc. as green, ZnS: Cu, Al
Etc., blue for ZnS: Ag, Cl, etc., and other colors for example ZnS: Mn, Y ₂ O ₃ : Eu, ZnO: Zn.
Most of semiconductors and insulators can be used for the electrodeposition method except for powder that is easily eluted in a solvent.

In FIG. 16, reference numeral 58 represents a counter electrode having a polarity opposite to that of the electrode 1 on the fluorescent surface panel during electrodeposition, 70A is a power source for electrodeposition, and 70B and 70C are power sources for applying reverse bias, respectively. .

In such a structure, first, the panel 14 is an electrodeposition liquid 12 in which red fluorescent powder is dispersed, for example, aluminum nitrate, magnesium nitrate, lanthanum nitrate, sodium hydroxide, potassium hydroxide as an electrolyte in cathodic electrodeposition. And thorium nitrate, etc., and glycerin as a dispersant, and isopropyl alcohol, acetone as a solvent, and the like, and then put in an electrodeposition solution 12 and a negative potential (DC voltage) to the first striped transparent electrode 1R via the terminal 3R, terminal 3G. Three
0 or a positive potential (reverse bias voltage) is applied to the other striped transparent electrodes 1G and 1B via B, and a positive potential is applied to the counter electrode 58 thereof, and as shown in FIG. The light powder is electrodeposited to form the red fluorescent film R.

Thereafter, the panel 14 is washed with alcohol or the like in order to remove a minute amount of fluorescent powder or the like adhering between the striped transparent electrodes 1 and to the spacer 10 by the non-electrostatic action such as Van der Waals force. Then, dry with hot air.

Next, the fluorescent surface panel 14 is put into the electrodeposition liquid 12 in which the green fluorescent powder is dispersed, and a negative potential is applied to each transparent electrode 1G corresponding to green through the terminal 3G, and another transparent electrode 1R. And 1B with 0 or a positive potential (reverse bias voltage), and with a positive potential applied to the counter electrode 58, the green fluorescent powder is electrodeposited only on the electrode 1G, and the above-mentioned red fluorescent film has no green mixture. A light film can be formed. In this case as well, similarly to the above, it is washed with alcohol or the like and then dried with hot air.

Further, the panel 14 is placed in an electrodeposition liquid 12 in which blue fluorescent powder is dispersed, and a negative potential is applied to each transparent electrode 1B corresponding to blue through the terminal 3B, and 0 or 0 to the other transparent electrodes 1R and 1G. A positive potential (reverse bias voltage) and a positive potential to the counter electrode 58 are applied to electrodeposit the blue fluorescent powder only on the electrode 1B, and the above-mentioned red fluorescent film and green fluorescent film have no blue mixture at all. A light film can be formed. In this case as well, similarly to the above, it is washed with alcohol or the like and then dried with hot air.

Through the above steps, as shown in FIGS. 18 and 11, the red, green and blue phosphors R, G and B are selectively formed on the narrow stripe electrodes 1R, 1G and 1B, respectively. be able to.

In cathodic electrodeposition, hydrogen or the like may be generated on the cathode side due to electrolysis of water or the like and electrochemical reaction of the electrolyte (free ions) at the cathode, which may reduce the ITO film. This is a pretreatment of the electrodeposition solution (water removal is H ₂ removal by electrolytic treatment or the like, and electrolyte free ions such as Al ³⁺ and La ³⁺ are removed by supernatant exchange of the electrodeposition solution or the like. ), It is possible to avoid this.

In the above steps, the coating film value of each fluorescent substance can be controlled by the electrodeposition time, the electric field intensity, the amount of fluorescent substance, the stirring intensity, etc. For example, the ITO stripe electrode on the effective screen of 48 × 48 mm square. [Pitch 330 μm, stripe width 50 μm, stripe distance 50 μm, trio (red, green, blue) distance 80 μ
m, stripe thickness 200-300 nm, 145 per color, total 435] to attach a 15 μm fluorescent substance, if the DC potential is 5 to 7.5 V, the electrodeposition time of 1 to 2 minutes is sufficient. .

The reason why the voltage has a range in this way is that the electrodes serving as the counter electrodes are different (the distance between the electrodes is also different) when red, green and blue are electrodeposited. By the way, when the red fluorescent substance is electrodeposited on the center portions of the red, green, and blue stripe electrodes 1R, 1G, 1B, the adjacent electrodes, that is, the red, blue stripe electrodes 1R, 1B are opposite electrodes. Since the distance between the electrodes is the same, it is sufficient to apply the same potential (around 7.5 V) to each electrode.

For the other colors, the electrodeposition is accurately performed by adjusting the potential according to the distance between the electrodes (finely adjusting to the optimum electric field strength) (the range of the potential difference applied to the counter electrode is the distance between the electrodes). However, it is at least 500 V or less, and preferably in the range of 1 to 50 V), although it cannot be uniquely determined since it depends on the above.

As described above, according to this example,
In the formation of a fluorescent surface for FED, a non-selective electrode (another electrode for electrode set on the same plane or an electrode provided in advance between electrodes for electrode selection) with respect to the selected electrode portion (stripe electrode for electrode attachment) Etc., and these become the counter electrodes.) Since the electrodeposition method of applying and finely controlling the DC bias voltage is applied to the portion, the following remarkable effects can be obtained.

(1) Adjacent electrode patterns (one side electrode pattern may be used) as counter electrodes, and electrodeposition coating on a predetermined electrode is possible even if there are steric obstacles such as spacers. It is also possible to electrodeposit a fluorescent body that does not impair the degree of vacuum.

(2) By applying a DC reverse bias voltage to the electrodes other than the selection electrode (this is because the voltage of the counter electrode necessary for electrodeposition also serves as the reverse bias voltage), color mixing is achieved even at a fine width and a fine pitch. It is possible to prevent the occurrence of the above phenomenon and the adhesion of the fluorescent substance between the striped electrodes for electrodeposition.

(3) Since the electrodes are formed by lithography or a printing method, the accuracy of the distance between the electrodes is dramatically improved, and the electric field near the selected electrode portion can be easily controlled by finely controlling the DC voltage. It is possible to uniformly coat the fluorescent material on a high-definition (narrow width) stripe.

(4) Since the selection electrode and the counter electrode can be installed on the same plane of the fluorescent panel, the electrodeposition tank and the electrodeposition apparatus can be made thin and the electrodeposition liquid can be made small. In addition, uniform agitation becomes easy because the liquid volume is reduced.

As described above, the terminals 3R, 3G, 3
The three-terminal treatment as shown in B is advantageous because it is possible to sequentially perform R, G, and B color electrodeposition coating and to enable color display by time-series color selection as the FED. is there.

Although the embodiments of the present invention have been described above, the above embodiments can be further modified based on the technical idea of the present invention.

For example, the underlayer may be formed by a method other than printing, and the material for the underlayer and the spacer body may be an appropriate material other than the above. In addition, the material of the other parts constituting the FED may be an appropriate material other than the above.

The spacer main body is not limited to a columnar shape, but may be an elliptic cylinder, a quadrangular prism, or another columnar body, or may be provided as a wall-shaped body on the underlayer.

Further, the pattern and arrangement of the above-mentioned phosphors and transparent electrodes, and the forming method thereof may be variously changed.
Furthermore, it is also possible to adopt a black matrix arranged in a grid pattern instead of the black stripes. Further, the black stripe or the black matrix may not be provided, and the base layer may be provided only under the spacer main body.

Further, instead of the fluorescent substance, another light emitting substance such as a phosphor can be used.

The light emitting device according to the present invention is a FED.
Alternatively, the display device is not limited to the display device other than that, and the photoelectric conversion element is attached to the fluorescent surface panel of the FED described above, and the light emission pattern of the fluorescent surface panel is converted into an electric signal by the photoelectric conversion element. It can also be applied to devices and the like.

[0100]

According to the present invention, a spacer for holding the gap between the first and second substrates is provided in the non-light emitting portion of the first substrate where no light emitter is present. Since the underlayer and the spacer body on the underlayer are directly integrated by layer printing and the underlayer is formed in a larger area than the spacer body, the spacer is formed as follows. Such an effect can be achieved.

Since the spacer is composed of the underlayer and the spacer main body as described above, the spacer can be made mechanically strong, and can be used during the spacer formation process or device assembly, or during use. There is no risk of damage such as peeling or collapse. As a result, no dust is generated in the space of the gap, the dimension of the gap is accurately maintained, and good light emission is guaranteed.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of an FED according to an embodiment.

FIG. 2 is an enlarged partial front view of the image display unit as seen from the rear panel side.

FIG. 3 is an enlarged partial front view seen from the rear panel side of the fluorescent surface panel.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged cross-sectional view of a substrate provided with the transparent electrode.

FIG. 6 is an enlarged cross-sectional view of a substrate provided with the base layer.

FIG. 7 is an enlarged cross-sectional view of a substrate provided with the spacer body.

FIG. 8 is an enlarged sectional view of a substrate provided with the same phosphor element.

FIG. 9 is a flowchart showing a procedure of forming the spacer.

FIG. 10 is an enlarged sectional view of an FED main part similar to FIG. 1 according to another embodiment.

FIG. 11 is an exploded perspective view of the FED according to the embodiment.

FIG. 12 is an exploded schematic perspective view showing a procedure for assembling the FED.

FIG. 13 is a schematic enlarged perspective view of a main part of the rear panel.

FIG. 14 is an explanatory diagram at the time of color selection by switching the three R, G, and B terminals.

FIG. 15 is a diagram showing a timing chart at the time of selecting the same color.

FIG. 16 is a schematic view of an electrodeposition device for depositing a fluorescent body on the color fluorescent surface.

FIG. 17 is a cross-sectional view showing a step in the manufacturing process for the color fluorescent surface.

FIG. 18 is a cross-sectional view showing still another step in the manufacturing process of the color fluorescent surface.

FIG. 19 is an exploded schematic perspective view of an FED according to a conventional example.

FIG. 20 is an enlarged partial perspective view of the rear panel.

[Explanation of symbols]

1R, 1G, 1B ... Transparent electrode (stripe electrode) 8, 28 ... Underlayer 9 ... Spacer body 10 ... Spacer 14 ... Fluorescent panel 15 ... Electrode assembly 16 ...・ ・ Back panel 17 ・ ・ ・ ・ Cathode electrode 18 ・ ・ ・ Insulating layer 18a ・ ・ ・ Through hole 19 ・ ・ ・ Gate electrode 20 ・ ・ ・ Cathode hole 21 ・ ・ ・ Microchip cathode 22 ・ ・ ・ Electrode intersection 23・ ・ ・ Color fluorescent surfaces 24, 26 ・ ・ ・ Substrate 29 ・ ・ ・ Glass wall 30A ・ ・ ・ Image display 30B ・ ・ ・ All display 34, 35 ・ ・ ・ Printing mask R ・ ・ ・ Red fluorescent Body G ... Green fluorescent body B ... Blue fluorescent body P ₁ , P ₂ ... Spacer pitch e ... Electron

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 31/12 H01J 9/227

Claims (14)

(57) [Claims] 1. A light emitting device in which a first base body provided with a light emitting body and a second base body face each other with a predetermined gap therebetween, and a spacer for holding the predetermined gap is provided. On the non-light-emitting portion of the first substrate where the light-emitting body does not exist, a base layer and a spacer formed by directly integrating the spacer body on the base layer by lamination printing are provided, The light emitting device, wherein the base layer is provided over a larger area than the spacer body, and both the base layer and the spacer body are made of an insulating material. 2. The light emitting device according to claim 1, wherein the base layer and the spacer body are provided in separate steps. 3. The light emitting device according to claim 1, wherein the spacer body is made of the same material as the base layer. 4. The light emitting device according to claim 1, wherein the spacer body and the base layer are made of different materials. 5. The light emitting device according to claim 1, wherein the spacer body and the base layer are integrally formed by firing. 6. The underlayer comprises a black mask formed using a black glass paste.
5. The light emitting device described in any one of 5. 7. The light emitting device according to claim 1, wherein a plurality of light emitters are provided in a stripe shape, and a base layer is provided in a stripe shape between the light emitters. 8. The light emitting device according to claim 1, wherein a spacer is provided for each predetermined number of light emitting body groups each including a light emitting body of a plurality of colors. 9. The light emitting device according to claim 1, wherein a light emitting body is provided on an optically transparent first substrate via a transparent electrode. 10. A second substrate is provided with a particle emission source,
The light-emitting device according to claim 9, wherein the light-emitting body of the first substrate emits light by the particles emitted from the particle-emitting source. 11. The light emitting device according to claim 10, wherein the particle emission source is configured as a field emission display device, which is a field emission cathode. 12. The light emitting body is a fluorescent body, and the light emitting body is a fluorescent body.
1. The light-emitting device according to any one of 1. 13. A method of manufacturing the light emitting device according to claim 1, wherein a base layer is formed in a predetermined pattern on the first base using a first mask, Forming a spacer main body on the base layer using a second mask different from the first mask in a narrower area than the base layer by directly laminating with the base layer. A method for manufacturing a light-emitting device having. 14. The spacer according to claim 13, wherein the underlayer is formed by printing, the spacer body is formed by laminated printing, and the underlayer and the spacer body are fired and integrated to form a spacer. And a method for manufacturing a light emitting device.