JP2932188B2 - Display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat type electron beam display device using an electron-emitting device, and more particularly, to a configuration of a spacer member of such a display device.

[Prior Art] Conventionally, in a flat panel type electron beam display device, a flying has occurred between an electron-emitting device substrate and a face plate having a phosphor which emits light by irradiation of an electron beam emitted from the electron-emitting device. A spacer is used in which each pixel or each region is surrounded by a partition so that the electron beam does not leak out to an adjacent pixel or region. This spacer is also used as an atmospheric pressure resistant structural material when a vacuum is applied between the electron-emitting device substrate and the face plate.

FIG. 7 is a partial sectional view of an electron beam display device showing a conventional example. 1 is an element substrate on which electron-emitting devices are arranged in a line, 2 is an electron-emitting portion, 3 is a modulation electrode composed of a linear electrode having an opening orthogonal to the line-shaped electron-emitting device, and 4 is made of a glass material. The face plate 5, 5 is an ITO film formed of a transparent electrode provided on the face plate 4, and 6 is a phosphor formed on the ITO film. Reference numeral 7 denotes an insulating layer for insulating the electron-emitting device from the modulation electrode 3, and reference numerals 21, 22, 23, and 24 denote spacers which are generally formed of photosensitive glass or the like and are surrounded by partition walls for each pixel of each phosphor.

Here, the inside of the device is evacuated, a positive voltage is applied to the ITO film 5 on the face plate 4, electrons are sequentially emitted from the electron emitting portions 2 arranged on the line, and the emitted electrons are emitted by the modulation electrode 3. By controlling the electron beam 30 irradiated to the phosphor 6 by modulating the light, an image by the light emission of the phosphor 6 can be arbitrarily displayed.

In addition, the partition walls of the spacers 21, 22, 23, and 24 have conductivity while having a very high resistance, and even if modulated discharge electrons are released from the phosphor 6 and irradiated on the partition walls of the spacer, the spacers are not covered with the spacers. It is a surface state that is difficult to charge up.

As described above, the conventional electron beam display device has been configured.

[Problems to be Solved by the Invention] However, in the conventional display device, it is necessary to surround each pixel or one region with a partition wall of a spacer. When the electrons deviate from the fluorescent screen, the fluorescent screen of an adjacent pixel or area is irradiated, and crosstalk on the image occurs.

Therefore, when the pixel pitch is reduced in order to improve the display image quality of the display device, the dimension of the opening of the spacer is also reduced, and the processing dimension approaches the limit. Furthermore, an acceleration voltage of several KV is applied between the face plate and the modulation electrode for accelerating the emitted electrons, and an interval of several mm or more is required to ensure a dielectric strength. Therefore, the height of the spacer does not change even when the pixel pitch dimension decreases, and needs to be several mm or more.

There are few suitable processing methods for spacers that satisfy such conditions. At present, formation of a spacer member using photosensitive glass is the method that can be processed with the highest precision. For example, when the pixel pitch, that is, the opening pitch is 1 mm (the partition wall thickness is 0.1 mm and the opening dimension is 0.9 mm square), the height of the photosensitive glass spacer can be about 1.4 mm.
However, the opening pitch is, for example, 0.3 mm × 0.6 mm (the partition wall thickness is
When the opening size is reduced to 0.1 mm and the opening size is set to 0.2 m × 0.5 mm), the workable height of the photosensitive glass spacer becomes as low as about 0.5 mm.

That is, when the distance between the element substrate and the face plate is about 4 mm and the pixel pitch is 1 mm, it is sufficient to laminate three photosensitive glass spacers. It is necessary to laminate as many as eight functional glass spacers. This leads to an increase in member costs and assembly costs and a decrease in yield.

Furthermore, in the case where the pixel pitch is further reduced to obtain a high-quality image display device, the conventional structure has a drawback that the device itself is difficult to manufacture because the spacer cannot be finely processed.

[Means for Solving the Problem (and Action)] The configuration of the present invention achieved to solve the above problem is as follows.

That is, the present invention provides a display device in which a plurality of spacers are arranged between an electron-emitting device and a target having a light-emitting means that emits light by irradiation with an electron beam emitted from the electron-emitting device. A spacer having an enclosed opening, wherein a plurality of the spacers are:
The display device is characterized in that the respective partition walls are stacked so as to cross each other.

The display device of the present invention further has a feature that “the dimensional pitch of the partition walls constituting the spacer is 1
That the size of the spacer is twice or more the size of the pixel or one region, and that a plurality of spacers are stacked with a displacement at the dimensional pitch of one pixel or one region. " That, "lamination of the spacer or the arrangement in a plane,
A reference surface or a structure in which the ends of the spacer abut against each other ”.

According to the present invention, a spacer having an opening surrounded by a partition as a spacer, for example, a dimensional pitch of the partition is 1
When the spacers are stacked with a size of at least twice the size of a pixel or one region and are shifted from each other at a dimensional pitch of one pixel or one region, the spacers are surrounded by the partition walls of the individual spacers. Even if the size of the opening part is large, the structure of the entire laminated spacer is substantially a structure having the partition walls with a fine dimension pitch. Therefore, the size of one pixel or one region surrounded by the partition walls of the spacer can be reduced without crosstalk on an image without reducing the size of the opening as the shape of each spacer.

Further, in the present invention, by adopting a configuration in which a plurality of spacers are stacked such that respective partition walls intersect with each other, the creepage distance can be increased as compared with the conventional case in which the spacers are stacked linearly without intersecting. Also, it is possible to improve the creeping pressure resistance of the spacer surface.

1 and 2 show an embodiment of the present invention. FIG. 1 is a partial sectional view of the display device of the present invention. In this drawing, 1 is an element substrate on which electron-emitting devices are arranged in a line, 2 is an electron-emitting portion, 3 is a modulation electrode composed of a linear electrode having an opening and orthogonal to the line-shaped electron-emitting device, 4 is a face plate made of a glass material, 5 is an ITO film made of a transparent electrode provided on the face plate 4, and 6 is an ITO film.
A phosphor 7 formed on the film 5 is an insulating layer for insulating the electron-emitting device and the modulation electrode 3, and 8, 9, 10, and 11 are # -shaped members formed of photosensitive glass. Emitting part 2
The spacers are staggered and stacked in a staggered manner in accordance with the arrangement pitch of.

FIG. 2 is a plan view when only the spacers 8, 9, 10, 11 stacked in a staggered shape are viewed from the upper surface of the display device. The spacers 8 and 10, 9 and 11 are in an overlapping state in this figure. Each of the spacers has a # shape in which partition walls are provided at a pitch twice the arrangement pitch of the electron emission portions 2. further,
The spacers 8 and 9, 10 and 11 are stacked while being displaced in the X and Y directions in the figure by the arrangement pitch dimension of the electron emitting portions 2.

The image formation by the above-described apparatus is the same as the conventional one.
In the figure, the apparatus is evacuated, a positive voltage is applied to the ITO film 5 on the face plate 4, electrons are sequentially emitted from the electron emitting portions 2 arranged in a line, and the emitted electrons are modulated by the modulation electrode 3. By doing so, by controlling the electron beam 30 irradiated to the phosphor 6, it is possible to arbitrarily display an image based on the emission of the phosphor.

Furthermore, the partition surfaces of the spacers 8, 9, 10, and 11 have conductivity while having a very high resistance, so that even if modulated emitted electrons fall off the phosphor screen 6 and irradiate the partition walls of the spacers, the spacers are not exposed. It is a surface state that is difficult to charge up.

In the embodiment of the present invention, the electron beam 30 emitted from the electron emitting section 2 flies to a location other than the phosphor 6 vertically above due to a change in the irradiation direction by the modulation electrode 3 or a change in the emission angle of the emitted electrons themselves. It is feared to do. However, when arranging the spacers in a staggered manner as shown in FIG.
By adopting a structure in which the phosphor of the adjacent pixel is hidden from the electron emission unit 2, even if the electron beam flies in a direction other than the phosphor 6, the phosphor of the adjacent pixel is erroneously irradiated to the spacer unit and erroneously applied to the spacer. It does not emit light when irradiated.

Although the shape and dimensions of one spacer member are the same as those in the conventional example of FIG. 7, in the present embodiment, the number of pixel portions surrounded by partition walls is reduced by staggering the spacer members. Can be reduced by a factor of four, and the array pitch dimension can be reduced by half. Therefore, the number of electron emitting portions can be arranged four times in the same area, and a high-quality image can be displayed.

Further, in FIG. 1, the vertical distance passing through the spacers 8, 9, 10, 11 between the modulation electrode 3 and the ITO film 5 is larger than that of the conventional linear one because of the staggered spacer. It has become longer by the amount of time. Therefore, the creeping breakdown voltage between the modulation electrode 3 and the ITO film 5 when the acceleration voltage is applied to the ITO film 5 is increased.

Further, since the space radiated by each electron beam is continuous with the adjacent space region in the X direction, when the space between the element substrate 1 and the face plate 4 is evacuated,
Compared with the conventional structure in which each space is closed by the partition of the spacer, the conductance of evacuation is larger.

FIG. 3 and FIG. 4 are plan views showing the arrangement of spacers when the display device of the present embodiment has a large screen.

In FIG. 3, reference numerals 12 and 12A, 12B, and 12C denote staggered stacked spacer groups, and reference numeral 13 denotes a reference surface that is in abutting state with the spacers 12 and the like. FIG. 4 is a partially enlarged view of FIG. 3, in which 12A, 12B and 12C are spacer groups stacked in a staggered manner, and 14 and 15 are spacer groups 12A and 12B and 12A and 12B.
A, butting surface between 12B and 12C.

As described above, the spacer formed of the photosensitive glass as shown in FIG.
Since one sheet is formed with a size of 30 cm square or less, it is effective in terms of processing yield, handling during assembly, and the like. Therefore, a large-screen display device as shown in FIG. 3 is assembled by arranging the spacer groups 12 stacked in a staggered manner in the surface direction on the electron-emitting device substrate, for example, in a staggered manner. can do. At this time, positioning between the spacers can be performed by abutting the partition wall ends of the spacers to the partition walls (for example, the abutting surfaces 14 and 15) of the adjacent spacers as shown in FIG.

Further, a reference surface 13 is provided on the outer periphery of the display portion of the display device, and the partition wall end of the spacer group 12 is first brought into contact with such a surface, and another spacer is sequentially brought into contact with the reference surface to assemble.

In the embodiment described above, the shape of the spacer member is a # -shape, the opening is a square, and the size of the opening is twice the pixel pitch. However, the present invention is not limited to this shape. .

FIGS. 5 and 6 are plan views showing a case where spacer members having different shapes from those in FIG. 2 are laminated. In FIG. 5, #
The case where the opening dimension of the shape spacer member is three times as large as the pixel pitch is shown, and a three-stage staggered lamination arrangement is provided. FIG. 6 shows a case where the opening shape of the # -shaped spacer member is rectangular, and the region surrounded by the partition wall can be rectangular.

Further, the structure of the display device shown in FIG. 1 has one electron emitting portion per pixel, but the present invention is not limited to this. For example, a deflection electrode is provided near the electron emitting portion. A structure in which an image is displayed by scanning an electron beam on the phosphor surface in both regions surrounded by the spacer may be used.

[Examples] Hereinafter, the present invention will be described in detail with specific examples.

Embodiment 1 A first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, FIG. 3, and FIG.

In FIG. 1, electron emitting sections 2 are arranged in a line at a pitch of 0.5 mm on an element substrate 1, and a linear modulation electrode 3 having an opening is interposed via an insulating layer 7.
(That is, in a line extending in the X direction). Next, # -shaped spacers 8, 9, 10, 11 having an opening pitch of 1.0 mm, a partition wall thickness of 0.1 mm, and a height of 1.4 mm shown in FIG.
Was formed by processing a photosensitive glass (manufactured by HOYA or Euning Co.), and an antistatic agent was coated on the side surfaces of the partition walls to perform a high resistance conductive treatment. These spacers were stacked in a zigzag pattern with a displacement of 0.5 mm in the X and Y directions as shown in FIG. 2 and arranged on the modulation electrode 3 as shown in FIG. Thereafter, the face plate 4 on which the ITO film 5 and the phosphor 6 were formed was arranged on the spacer 11, necessary electrodes were taken out around the spacer 11, a port for vacuum exhaust was provided, and the element substrate 1 was sealed. Then, the space between the sealed element substrate 1 and the face plate 4 was evacuated by a vacuum pump. At this time, the degree of vacuum evacuation was examined by measuring the amount of emission current emitted from the electron-emitting portion and applied to the ITO film. The evacuation time was less than 2/3 of that of the conventional structure shown in FIG. As a result, the same amount of emission current was obtained.

Here, an accelerating voltage of electrons of +3 KV is applied to the ITO film 5, electrons are sequentially emitted from the electron emitting portions 2 arranged in a line, and the modulation electrode 3 controls the modulation of the electron beam to irradiate the phosphor 6 to emit light. As a result, an arbitrary pixel could be displayed. At this time, the electron beam of the adjacent pixel accidentally irradiates the phosphor,
There was no occurrence of crosstalk on the image. When the voltage applied to the ITO film 5 was increased, abnormal discharge occurred between the modulation electrode 3 or the element substrate 1 and the ITO film 5, but the generated voltage was higher than that of the conventional structure shown in FIG.
It was about 1.2 times larger.

Next, an example in which the display device of this embodiment is a large-screen display device will be described below. Third, reference numeral 13 is a reference surface formed of a glass block having a side wall with very high surface precision, which is disposed at a screen end on the element substrate 1. This reference plane was correctly arranged and fixed at the arrangement pitch position of the electron emission portions 2.
A spacer group 12 staggered with respect to this reference plane
Abut the end face of Further, a plurality of spacers were arranged and fixed as shown in FIG. 3 by sequentially abutting the spacers. The ends of the spacers are abutted against each other in a shape as shown in FIG. That is, spacer group 12
The contact surface 14 between A and 12B and the spacer group
12A, 12B and 12C are in contact with each other by the abutment surface 15, and mutual positioning is performed. The shapes of the spacer groups 12A, 12B, and 12C are the same as those in FIG. ing. The size of one spacer in FIG. 3 was about 10 cm square. Using the spacer arranged according to the present embodiment,
When a display device having the same structure as that of FIG. 1 was produced, an image display similar to that of the above-described embodiment could be obtained.

Further, the positioning by abutting as shown in FIGS. 3 and 4 can also be used as the positioning when the spacers 8, 9, 10, and 11 shown in FIG. 2 are stacked.

Example 2 As shown in FIG. 5, the opening pitch was 1.2 mm, the partition wall thickness was 0.07 mm,
Spacers 16, 17, and 18 having a # shape having a height of 0.5 mm were formed by processing photosensitive glass. The spacers were shifted in a pitch of 0.4 mm and stacked in a three-stage staggered pattern. Similarly, the spacer group was further laminated, and a total of nine spacers and a height meter
A 4.5 mm spacer group was formed. The pixel pitch of the formed spacer was 0.4 mm square, and a display device having the same structure as in Example 1 was manufactured. As a result, a higher-precision image could be displayed.

Example 3 As shown in FIG. 6, opening pitch 1.0 mm × 3.0 mm, partition wall thickness
# -Shaped spacers 19 and 20 having a rectangular opening of 0.1 mm and a height of 1.4 mm were formed by processing photosensitive glass.
Shift each spacer by 0.5mm in the X direction and 1.5mm in the Y direction
The layers were stacked in a staggered manner. Similarly, the laminated spacer groups were further stacked to form a spacer group having a total of four spacers and a total of 5.6 mm in height. The pixel pitch of the formed spacer is
It is a rectangle of 0.5mm x 1.5mm.

Next, the phosphors of the display device were arranged in R, G, B and three colors in units of 1.5 mm square by arranging three rectangular pixels in parallel. Otherwise, a display device having the same structure as that of Example 1 was manufactured. As a result, a color image capable of controlling color and brightness at a 1.5 mm square pitch could be displayed.

[Effects of the Invention] As described above, a spacer having an opening surrounded by partitions is used as a spacer of a display device using an electron-emitting device, and a plurality of such spacers are stacked such that the partitions intersect each other. As a result, 1. the size of one pixel or one area surrounded by the partition walls of the spacer can be reduced without crosstalk on the image without reducing the size of the opening as the shape of each spacer. . Therefore, higher-definition display transmission of an image is realized.

2. The creepage distance of the spacer can be lengthened, and the creepage withstand voltage of the spacer surface can be improved. As a result, it is possible to increase the emission luminance of the light emitting means by increasing the acceleration voltage of the electrons, to reduce the diameter of the irradiation spot of the electron beam on the light emitting surface, to obtain a high-definition image, and to cause abnormal discharge. It becomes difficult.

3. Since the space radiated by each electron beam surrounded by the spacers is connected to the adjacent space area, the evacuation conductance in the display device is increased, the evacuation time is shortened, and productivity is improved. I do.

4. In addition, when the spacers are stacked or arranged in a plane, if a certain reference surface or the end of such spacers are made to abut against each other, it is relatively easy to locate the spacers even in a large-screen display device. This also has the effect of improving the production yield as compared with the case where a single spacer for a large screen is formed.

[Brief description of the drawings]

FIG. 1 is a structural sectional view of a display device showing a first embodiment of the present invention, FIG. 2 is a plan view showing a spacer used in the first embodiment of the present invention, and FIG. FIG. 4 is a plan view showing the arrangement of the spacers used in the first embodiment of the present invention. FIG. 4 is a partially enlarged view of the plane showing the arrangement of the spacers used in the first embodiment of the present invention. FIG. 6 is a plan view of a spacer showing a second embodiment of the present invention. FIG. 6 is a plan view of a spacer showing a third embodiment of the present invention. FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... Element board 2 ... Electron emission part 3 ... Modulation electrode 4 ... Face plate 5 ... ITO film 6 ... Phosphor 7 ... Insulating layer 8,9,10,11,16,17,18, 19,20,21,22,23,24 spacers 12,12A, 12B, 12C spacer group 13 reference surface 14,15 abutment surface 30 electron beam

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kohei Nakata 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Ichiro Nomura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside (72) Inventor Toshihiko Takeda 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Yoshikazu Banno 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. ( 56) References JP-A-52-82071 (JP, A) JP-A-63-53836 (JP, A) JP-A-57-88656 (JP, A) JP-A-59-158267 (JP, U) (58) ) Surveyed field (Int.Cl. ⁶ , DB name) H01J 29/86 H01J 29/87 H01J 31/12

Claims (4)

(57) [Claims] 1. A display device in which a plurality of spacers are arranged between an electron-emitting device and a target having a light-emitting means for emitting light by irradiation of an electron beam emitted from the electron-emitting device, wherein the spacer is surrounded by a partition. A display device, comprising: a spacer having an opening formed therein, wherein a plurality of the spacers are stacked such that respective partition walls cross each other. 2. The dimensional pitch of the partition walls constituting the spacer is at least twice as large as the size of one pixel or one region, and a plurality of spacers are stacked while being shifted by the dimensional pitch of one pixel or one region. The display device according to claim 1, wherein: 3. The display device according to claim 1, wherein the shape of the spacer is a # shape. 4. The display device according to claim 1, wherein the spacers are stacked or arranged in a plane such that the spacers abut against each other at a certain reference plane or at ends of the spacers.