JP2000156181A - Flat display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid degradation in luminance by forming flat space below atmospheric pressure between a front face board and a back face board, and limitedly providing support bodies abutting on the plate face of a plate spacer for erectly supporting the plate spacer, at positions corresponding to the arranged parts of light-absorbing parts. SOLUTION: A flat display unit is easily damaged and deformed by external pressure because of high vacuum inside. In order to avoid this, a plate spacer several tens of micrometers in thickness and 1-2 mm in height is disposed between boards to support both boards. A spacer 20 is formed accurately disposed on a light-absorbing part 11b so as not to overlap a fluorescent part 11a, that is an effective area contributing to image display, and a plurality of support bodies 30 for supporting the spacer 20 are provided on the light-absorbing parts 11b, abutting on the plate face of the plate spacer 20. The spacer 20 is therefore disposed at a part sandwiched by the support bodies 30, so as to extend in the direction intersecting a striped pattern. In this way, with the spacer 20 thus held sandwiched with the support bodies 30, the spacer 20 can be disposed on the light-absorbing part 11b with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device.

[0002]

2. Description of the Related Art A flat display device having two opposing substrates (a front substrate and a rear substrate), for example, an FED (Field Emission Display) panel is a conventional cone-type CRT (cathode ray tube). Similarly, it has a structure in which an electron beam emitted from an electron emitting portion is made to emit light by being incident on a phosphor screen, so that a substantially vacuum atmosphere is maintained between two opposing substrates.

[0003] For this reason, the two substrates arranged opposite to each other are:
Subject to pressures close to atmospheric pressure. In such a vacuum container, it is necessary to hold the vacuum container, that is, to prevent the container from being deformed or broken by pressure.
In the case of a CRT structure, in order to withstand this pressure, a diagonal of 5 inches is about 5 mm, and a diagonal of 10 inches is 10 mm.
It is necessary to apply a glass substrate with a thickness of about mm,
This makes it impossible to reduce the weight and thickness of the entire panel.

[0004] For this reason, a plate-shaped spacer is provided between the two substrates so as to avoid deformation or destruction due to pressure, so that the plate surface direction is orthogonal to the substrate surface. The structure which supports is proposed.

FIG. 11 shows a flat display device 1 having a conventional structure.
00, for example, shows a schematic perspective view of an FED (Field Emission Display) device. In this case, in order to show the internal structure, a part is cut away. This flat display device 1
00 denotes a front substrate 101, a rear substrate 102, and a side wall portion 10.
3 to form an airtight flat space for maintaining the inside of the inside substantially vacuum.

On the rear substrate 102, wirings orthogonal to the row direction and the column direction are formed with their intersections electrically insulated via an insulating layer 210 such as SiO ₂ . A simple matrix is formed by the row direction wirings 104 and the column direction wirings 105, and an electron emission portion (not shown) is appropriately set according to the target number of display pixels corresponding to each intersection. Is formed.

On the inner surface of the front substrate 101, a fluorescent film 110 is provided.
Are formed. The fluorescent film 110 includes a fluorescent portion 110
a and a light absorbing portion 110b, that is, a portion mainly absorbing visible light. This fluorescent film 110
Is formed by forming a fluorescent portion 110a and a light absorbing portion 110b in a stripe shape as shown in FIG.
Alternatively, as shown in FIG. 13, there is a light-emitting device in which light absorbing portions 110b are formed in a lattice shape.

The fluorescent portion 110a is provided with three primary color phosphors of red, green and blue. By forming the light absorbing portion 110b in the fluorescent film 110, it is possible to prevent a display color from being shifted even if there is a shift in the electron beam irradiation position, or to prevent reflection of external light to lower display contrast. Can be avoided.

As described above, since the inside of the flat-panel display device 100 is maintained at a high vacuum, there is a possibility that damage or deformation may be caused by an external pressure. For example, a plate-like spacer 1 having a thickness of several tens of μm and a height of about 1 to 2 mm
11 to support both substrates.

[0010]

SUMMARY OF THE INVENTION Plate-like spacer 11
In a hermetically sealed flat space, for example, a fluorescent portion 110a along a column direction, that is, contributes to image display, for example, in a formation portion of a light absorbing portion of a lattice pattern arranged in a row direction and a column direction. To avoid overlapping the effective area,
On the light absorbing part 110b, they are arranged with high precision.

The spacer 111 can be fixed using, for example, an adhesive.
Even when the substrate 11 and the substrate 11 are positioned and fixed, the spacer 111 often sags after the jig is released, and the positional accuracy is often not satisfied.

Also, the thermal expansion coefficient of the spacer 111 is
If the thermal expansion coefficient is larger than the thermal expansion coefficient of both substrates 101 and 102, sagging occurs in the length direction of the spacer 111 due to heat treatment in the sealing or exhaust process in the airtight container performed after the spacer 111 is installed on the substrate. However, this causes a large distortion in the vertical direction of the spacer 111, and does not satisfy the positional accuracy.

As described above, if precise positioning cannot be performed when the spacer 111 is installed, the spacer 111 may protrude from the fluorescent portion 110a, which is a portion of the fluorescent film 110, which contributes to image display. Become
This causes the luminance to deteriorate.

As a method for installing the plate-like spacer 111 without distortion with high precision, a method has been proposed in which spacer guides are provided at both ends of the spacer and the spacers are fitted into the spacer guides (Candescent Technology Corp:
PAT No. US5377105). This method is, for example, when the spacers 111 are aligned and arranged on the fluorescent film 110 in which the light absorbing portions 110b are formed in a lattice shape as shown in FIG. 13, first, as shown in FIG. Of the light absorbing portion 1
10b are arranged at both ends. Next, as shown in FIG. 15, it is assumed that the spacer 111 is disposed between the two spacer guides 120 in the light absorbing portion 110b.

However, according to the above method, FIG.
As shown in FIG. 6, the spacer guide 120 is
Since a part of Oa, that is, a part of the effective area is blocked, the area of the display area decreases and the non-light emitting area increases accordingly. For this reason, the above-described method has a disadvantage that the brightness of the displayed image is deteriorated.

The inventor of the present invention has conducted intensive studies, and as a result, has realized a structure in which the spacers 111 can be arranged with high accuracy and the luminance of the flat display device is prevented from deteriorating.
A flat display device is provided.

[0017]

According to the present invention, there is provided a flat display device comprising: a front substrate having a display portion on which a light absorbing portion having a predetermined pattern is formed; A plate-shaped spacer is arranged and interposed between the front substrate and the rear substrate so as to support the two substrates, and the outer peripheral portions of the two substrates are hermetically sealed. A flat space below the atmospheric pressure is formed between the substrates, and a support that is in contact with the plate surface of the plate-shaped spacer to support the spacer is provided only at a position corresponding to the arrangement portion of the light absorbing portion. And

By installing the support so as to be in contact with the plate surface of the plate-shaped spacer and to support the spacer in an upright manner, the arrangement accuracy of the plate-shaped spacer is improved, and at the same time, By providing the support that sandwiches the spacers on both sides only on the light absorbing portions of the fluorescent film, it is possible to avoid deterioration in brightness in the flat display device.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the flat display device of the present invention, a predetermined distance is maintained between a front substrate having a display portion on which a light absorbing portion of a predetermined pattern is formed and a rear substrate having an electron emission cathode. A plate-like spacer is interposed between the front substrate and the rear substrate so as to support the two substrates, and the outer peripheral portions of the two substrates are hermetically sealed, so that A flat space below the atmospheric pressure is formed in the support, and a support for contacting the plate surface of the plate-shaped spacer and supporting the spacer is provided only at a position corresponding to the arrangement portion of the light absorbing portion. .

Hereinafter, an example of the flat display device of the present invention will be described, but the present invention is not limited to the following examples.

FIG. 1 is a schematic perspective view of a flat display device 10 of the present invention, for example, an FED (Field Emission Display) device. In this case, to show the internal structure,
Some parts are cut away. The flat display device 10 is surrounded by a front substrate 1, a rear substrate 2, and a side wall portion 3 and forms an airtight flat space for maintaining the inside of the flat display device 10 substantially at a vacuum. In order to evacuate the inside of the hermetic container to a substantially vacuum as described above, an airtight flat space is assembled, an exhaust pipe and a vacuum pump (not shown) are connected, and the inside of the hermetic flat space is, for example, 1 mm.
Evacuate to a degree of vacuum of about 0 ^-7 [Torr].

On the back substrate 2, wirings orthogonal to the row direction and the column direction are formed so that their intersections are electrically insulated via an insulating layer 21 such as SiO ₂ . A simple matrix is formed by the row wirings 4 and the column wirings 5, and an electron emitting portion (not shown) is appropriately set according to the number of target display pixels corresponding to each intersection. Is formed.

On the inner surface of the front substrate 1, a fluorescent film 11 is formed. The fluorescent film 11 includes a fluorescent portion 11a and a light absorbing portion 11b, for example, a black portion, that is, a portion mainly absorbing visible light. This fluorescent film 11
For example, there is also a type in which the fluorescent portion 11a and the light absorbing portion 11b are formed in a stripe shape as shown in FIG. 12, or a type in which the light absorbing portion 11b is formed in a lattice shape as shown in FIG. is there.

The fluorescent portion 11a is provided with three primary color phosphors of red, green and blue. In the fluorescent film 11,
By forming the light absorbing portions 11b, even if there is a shift in the irradiation position of the electron beam, it is possible to avoid a shift in the display color, or to prevent reflection of external light to avoid a decrease in display contrast. be able to.

As described above, since the inside of the flat-panel display device 10 is maintained at a high vacuum, there is a possibility that damage or deformation may be caused by external pressure. For example, the thickness is several tens μm,
A plate-like spacer 20 having a height of about 1 to 2 mm is provided to support both substrates.

In the flat display device 10, the plate-like spacer 20 is provided with a light absorbing portion 11b so as not to overlap with the fluorescent portion 11a, that is, an effective area contributing to image display.
On top of that, it is necessary to arrange and form with high accuracy.

In the present invention, in particular, the plurality of support members which are in contact with the plate surface of the plate-shaped spacer 20 and which support the spacer are settled are limited to the position corresponding to the arrangement portion of the light absorbing portion 11b. Shall be provided.

For example, in a flat display device 10 having a fluorescent film 11 in which a fluorescent portion 11a and a light absorbing portion 11b are formed in a stripe pattern as shown in FIG. 12, as shown in FIG. 11b
That is, the spacer 2 is intermittently except for between the stripes.
The support 30 is disposed so as to maintain a predetermined interval corresponding to a thickness of 0.

Then, as shown in FIG. 3, a spacer 20 is arranged in a region sandwiched between the supports 30 so as to extend in a direction crossing the stripe pattern.

FIG. 4 shows an example in which the light absorbing portions 11b are formed in a lattice pattern as shown in FIG. 13 and the fluorescent films 11 in which the fluorescent portions 11a are separately applied to the respective matrices. As shown, the support 30 is. It is intermittently arranged on the light absorbing portion intersecting the position where the plate-shaped spacer is arranged, except for between the lattices. The plate-like spacer is arranged so as to extend to a predetermined light absorbing portion of the lattice pattern.

As described above, the spacer 20 is connected to the support 30.
The spacer can be reliably arranged with high precision on the light absorbing portion 11b.

As shown in FIG. 3 and FIG.
When the spacers 20 and the spacers 20 are arranged, as shown in FIG. 6, the support 30 is arranged only on the light absorbing portion 11b, so that the area of the non-light emitting region is smaller than that in the case shown in FIG. Can be reduced. Therefore, as compared with the example of the flat display device having the conventional structure shown in FIG. 16, it is possible to effectively avoid the deterioration of the brightness in the image display.

In the above-described example, a structure in which the support is provided intermittently for each row of the light absorbing portions has been described. However, the present invention is not limited to the above example. For example, as shown in FIG.
Can be applied to those having a longer dimension than the example shown in FIG. As described above, the support 31 having a long dimension is used.
Also, in the case where is applied, as shown in FIGS. 7 and 8, the area of the non-light-emitting region on the phosphor screen can be made smaller than in the related art, as shown in FIG. Can be prevented from deteriorating in brightness. Further, by increasing the dimensions of the support body 31 itself, handling becomes easy, and the manufacturing process of the flat display device can be simplified.

Further, in the above-described example, the support placed on the light absorbing portion is described as a pair separated on both sides of the spacer so as to sandwich the spacer from both sides. However, for example, as shown in FIG. 9, a groove 3 having a predetermined width corresponding to the thickness of the spacer 20 is formed in the center of the support 32.
Those having 3 can be similarly applied. As described above, by applying the support 32 having the groove 33, FIG.
As shown in FIG. 6, even in the case where the spacer 20 is fitted in the groove 33, the area of the non-light-emitting region on the phosphor screen is the same as described with reference to FIG.
Since it can be made smaller than before, it is possible to avoid deterioration in brightness in image display.

In the groove 33 of the support 32, the bottom is higher than the phosphor screen.
As shown in (2), even when the spacer 20 is fitted into the groove 33, since the spacer 20 does not contact the fluorescent screen, the possibility of damage to the spacer 20 can be reduced. In addition, since the support 32 is integrated without being separated, the handling is facilitated, and the manufacturing process of the flat display device can be simplified.

[0036]

According to the flat display device of the present invention, since the spacer is sandwiched by the support disposed only on the light absorbing portion 11b, the spacer is reliably disposed on the light absorbing portion with high precision. I was able to.

In the flat display device of the present invention, the support 30 is arranged only on the light absorbing portion 11b.
The area of the non-light emitting region could be reduced. For this reason, compared with the example of the flat-panel display device having the conventional structure, it was possible to effectively avoid deterioration in brightness in image display.

Further, in the flat display device of the present invention,
When a support having a groove having a predetermined width corresponding to the thickness of the spacer is applied to the center of the support, when the spacer is fitted into the groove, the spacer is prevented from contacting the phosphor screen. As a result, the possibility of damaging the spacer was reduced.

[0039]

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a flat panel display according to the present invention.

FIG. 2 shows an arrangement state diagram of a support in the flat display device of the present invention.

FIG. 3 shows an arrangement state diagram of a support and a spacer in the flat display device of the present invention.

FIG. 4 is a diagram showing another example of the arrangement of supports in the flat panel display according to the present invention.

FIG. 5 is a diagram showing another example of the arrangement of supports and spacers in the flat display device of the present invention.

FIG. 6 is a schematic plan view illustrating a positional relationship among a fluorescent part, a light absorbing part, a support, and a spacer of a fluorescent film in the flat display device of the present invention.

FIG. 7 is a diagram showing another example of the arrangement of supports in the flat panel display according to the present invention.

FIG. 8 is a diagram showing another example of the arrangement of supports and spacers in the flat display device of the present invention.

FIG. 9 shows another example of the arrangement of supports in the flat display device of the present invention.

FIG. 10 is a diagram showing another example of the arrangement of supports and spacers in the flat display device of the present invention.

FIG. 11 is a schematic perspective view of a main part of a conventional flat display device.

FIG. 12 is a schematic plan view of a fluorescent film in which a light absorbing portion and a fluorescent portion are formed in a stripe shape.

FIG. 13 is a schematic plan view of a fluorescent film in which a light absorbing portion is formed in a lattice shape and a fluorescent portion is formed in the lattice.

FIG. 14 is a view showing an arrangement of spacer guides in a conventional flat panel display device.

FIG. 15 shows an arrangement state diagram of spacer guides and spacers in a conventional flat panel display device.

FIG. 16 is a schematic plan view illustrating a positional relationship among a fluorescent portion, a light absorbing portion, a spacer guide, and a spacer of a fluorescent film in a conventional flat display device.

[Explanation of symbols]

10,100 flat display device, 1,101 front substrate, 2,102 rear substrate, 3,103 side wall portion, 4,
104 row direction wiring, 5,105 column direction wiring, 11,
110 fluorescent film, 11a, 110a fluorescent part, 11b,
110b light absorbing part, 20,111 spacer, 2
1,210 insulating layer, 30, 31, 32 support, 12
0 Spacer guide

Claims (7)

[Claims] 1. A front substrate having a display portion on which a light absorbing portion of a predetermined pattern is formed, and a rear substrate having an electron emission cathode are opposed to each other with a predetermined distance therebetween. Between the substrates, a plate-shaped spacer is arranged and interposed so as to support the two substrates, the outer peripheral portions of the two substrates are hermetically sealed, and the flatness between the two substrates is equal to or less than the atmospheric pressure. In the flat-panel display device that forms a space, it is preferable that a support that is in contact with the plate surface of the plate-shaped spacer and that supports the spacer is provided only at a position corresponding to the arrangement portion of the light absorbing portion. Characteristic flat display device. 2. The light absorbing portion forming pattern is a plurality of parallel stripe patterns, the plate-like spacer is arranged to extend in a direction intersecting the stripe pattern, and the support of the spacer is provided. 2. The flat display device according to claim 1, wherein the light emitting devices are formed intermittently on the stripe pattern except for between the stripes. 3. The formation pattern of the light absorbing portion is a lattice pattern, and the plate-like spacer is disposed so as to extend to a predetermined light absorbing portion of the lattice pattern. 2. The flat display device according to claim 1, wherein the support is formed intermittently on the light absorbing portion intersecting with the plate-shaped spacer, except for between lattices. 3. 4. The flat display device according to claim 2, wherein a plurality of pairs of the supports are formed on the light absorbing portion, and the supports sandwich the spacer. . 5. The flat display device according to claim 3, wherein a plurality of pairs of the supports are formed on the light absorbing portion, and the supports sandwich the spacer. . 6. The support has a groove in the center, the spacer is fitted in the groove, and the bottom of the groove is formed at a predetermined distance from the surface on which the display section is formed. The flat display device according to claim 2, wherein: 7. The support has a groove in the center, the spacer is fitted into the groove, and the bottom of the groove is formed at a predetermined distance from the surface on which the display section is formed. The flat panel display according to claim 3, wherein: