JP2003295775A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an operation sound caused by resonance of a substrate. <P>SOLUTION: A plasma display device has such a structure that pressure is applied to an annular region surrounding a display region 60 which is arranged at the outside of the display region and the inside of a shielding material 35 jointing a pair of substrates at periphery of opposing gap of the pair of substrates. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device having a plasma display panel (PDP) assembled in a housing.

Plasma display devices are becoming popular as large-screen television receivers. Along with the improvement in display quality, improvements in overall operating performance are being pursued toward the expansion of usage.

[0003]

2. Description of the Related Art Surface discharge PDP used for color display
Has a partition wall for preventing discharge interference between adjacent cells. The partition pattern includes a stripe pattern for partitioning the display area into columns of matrix display and a mesh pattern for partitioning into cells. When the stripe pattern is adopted, a plurality of partition walls having a band shape in plan view are arranged in the display area. When the mesh pattern is adopted, one partition (so-called box rib) having a shape in plan view surrounding all cells is arranged in the display area. Such a partition has a height of 150 μm to 200 μm and defines the size of the facing gap between the substrate pair in the display area.

In general, the partition wall is a fired body of low melting point glass and is formed by the following procedure. (A) A low melting point glass paste is applied on a glass substrate in a uniform thickness and dried.
(B) A mask having a pattern corresponding to the partition is formed on the dried paste layer by photolithography.
(C) The unmasked portion of the paste layer is cut by sandblasting with a cutting material.
(D) After removing the mask, the patterned paste layer is baked.

[0005]

In the formation of partition walls,
A certain amount of height variation is unavoidable. In particular, when firing the paste layer patterned by sandblasting as described above, a side cut occurs in which the cutting in the sandblasting process goes under the mask so that the end portions of the partition walls in plan view are more than the others when firing thereafter. It can be high. Specifically, the height design value is 140
In the partition wall of μm, the end portion is higher than other portions by about 30 μm. This phenomenon is called "bounce", and it is considered that the cause is nonuniform heat shrinkage stress. The jump is caused by overlapping the substrate having the partition wall with another substrate P
In assembling the DP, the adhesion between the substrates is incomplete. In most of the partition formation region, the counter substrate surface is in close contact with the upper surface of the partition, whereas in the vicinity of the jumped position in the partition formation region, only the lifted partition end contacts the counter substrate surface. The substrate is microscopically curved and a gap is created between the upper surface of the partition wall and the surface of the counter substrate. In the PDP in such a state, there has been a problem that the substrate is locally vibrated locally due to the electrostatic electrostatic attraction accompanied with the application of the high frequency drive voltage for display, which causes a slight sound.

An object of the present invention is to reduce operating noise due to substrate resonance.

[0007]

According to the present invention, a sealing material for joining a pair of substrates on the outer surface of a pair of substrates constituting a plasma display panel, which is outside the display area and around a facing gap between the pair of substrates. A pressing force is applied to an annular area inside the area surrounding the display area. As means for applying a pressing force, there are a method of inserting a pressing member between the plasma display panel and a housing that houses it, and a method of bringing the housing into contact with the substrate surface. The pressing member may be an elastic body including hard rubber or a resin spring, or may be a rigid body made of resin or metal.

[0008]

1 is a schematic configuration diagram of a display device according to the present invention. The display device 100 is
It is composed of a PDP 1, a housing 71, and a drive unit. The PDP 1 comprises a pair of substrate structures 10 and 20. The substrate structure means a structure including a plate-shaped support having a size larger than the screen size and at least one other type of panel component. The substrate structures 10 and 20 are opposed to each other so as to overlap each other, and the periphery of the opposed region is joined with a sealing material 35. The housing 71 houses the PDP 1 and the drive unit. However, the housing 71 has a window 710 having a screen size and does not hide the display area (area corresponding to the screen) 60 on the front surface of the PDP 1. The drive unit has drivers 51, 52, 53 connected to the electrodes of the PDP 1. In the figure, for the sake of convenience, the drivers 51, 52 and 53 are PDPs.
It is placed around 1 but these are actually PDPs
It is placed after 1. The drive unit is attached to the back surface of the PDP 1, and the PDP 1 is fixed to the housing 71 by attaching the drive unit to the housing 71.

FIG. 2 is a diagram showing an example of the cell structure of the PDP 1. In each cell forming the display screen, the display electrodes X and Y intersect with the address electrode A. Display electrodes X, Y
Are arranged on the inner surface of the glass substrate 11 on the front side,
Each is composed of a transparent conductive film 41 forming a surface discharge gap and a metal film (bus electrode) 42 extending over the entire length of the row. 30 to 50 μm thick so as to cover the display electrode pair
A dielectric layer 17 having a thickness of about m is provided, and magnesia (MgO) is deposited as a protective film 18 on the surface of the dielectric layer 17. The address electrodes A are arranged on the inner surface of the glass substrate 21 on the back side and covered with the dielectric layer 24. On the dielectric layer 24, one strip-shaped partition 29 having a height of about 140 μm is provided between each address electrode A. These partition walls 29 cause the discharge spaces to be arranged in columns along the rows of the matrix display.
mn), and the dimensions before and after the discharge space are defined. A row space 31 corresponding to each row of the discharge space
Is continuous across all lines. Further, phosphor layers 28R, 28G, 28B of three colors of R, G, B for color display are provided so as to cover the upper surface of the address electrode A and the inner surface of the back side including the side surface of the partition wall 29. ing. The italicized alphabets R, G, B in the figure indicate the emission colors of the phosphors. The phosphor layers 28R, 28G, 28B are locally excited by the ultraviolet rays emitted by the discharge gas to emit light.

FIG. 3 is a schematic view of the main structure of the display device. In the figure, the components except the glass substrate 11 in the front-side substrate structure are omitted, and the components except the glass substrate 21 and the partition wall 21 in the rear-side substrate structure are omitted. Actually, the thickness of the glass substrates 11 and 21 is 2
mm to 3 mm, while the thickness of the dielectric layer is 30
It is about μm, which is sufficiently small. The electrodes and the protective film are thinner than the dielectric layer.

In the PDP 1, the distance D1 between the inner end of the sealing material 35 and the display area 60 is about 15 mm, and the partition 29
The distance D2 between the edge of the display area 60 and the display area 60 is 7 mm to 8 mm. As described above, the partition 29 is the rear glass substrate 21.
It is formed on the upper end and is raised higher than the other parts. The jump amount ΔH is about 30 μm. The sealing material 35 is made of a low melting point glass having a softening point lower than that of the partition wall material, and the partition wall 29 is not softened in the sealing step of fusing the glass substrate 11 and the glass substrate 21 together. Therefore, in the sealing step, the end portion of the glass substrate 11 is slightly curved and deformed, and a gap 33 is formed between the glass substrate 11 and the upper surface of the partition wall 29. From the inner end of the gap 33 to the sealing material 3
In the range of the length D3 up to the inner end of 5, the glass substrate 11 is unstable in the so-called floating structure (sealing material 35).
A beam having a length (width) D3 along the is formed). The specific value of the beam length D3 is about 40 mm. In the PDP 1 having such a floating portion, the floating portion of the substrate locally resonates at a natural frequency due to periodic electrostatic attraction accompanying application of a high frequency drive voltage for display,
This may cause a faint sound. When the length D3 of the beam is 40 mm or less, the resonance frequency becomes high frequency and no sound is heard. Therefore, the pressing pressure is required so that the length of the beam represented by D3 is 40 mm or less.

In the display device 100, the PD
In order to reduce the sound caused by the resonance of P1, the PDP 1 and the housing 7
A pressing member 75 made of rubber and having a thickness of about 2 mm to 3 mm is inserted between the pressing member 75 and the pressing member 75. Pressing member 7 as shown in FIG.
Reference numeral 5 is an annular shape that surrounds the display area 60. A pressing force is applied to the outer surface of the glass substrate 11 by the pressing member 75, and the microvibration of the glass substrate 11 is suppressed. The pressing member 75 is hidden by the housing 71 so that it cannot be seen from the front. Further, in order to effectively apply the pressing force, the pressing member 75 is arranged in the floating portion of the glass substrate 11. That is, the pressing member 7
The contact surface between 5 and the glass substrate 11 is limited to the range of the length D3 from the inner end of the gap 33 to the inner end of the sealing material 35.
In the illustrated example, the gap 33 extends into the display region 60, but when the inner end of the gap 33 is outside the display region 60, the pressing member 75 can be provided up to the inner end of the gap 33. Further, in this case, the pressing force may be applied to the entire range of the length D3, or the pressing force may be locally applied to an intermediate position in the direction of the length D1. The material of the pressing member 75 is not limited to the elastic body. When the housing 71 has an appropriate flexibility, an appropriate pressing force can be applied to the glass substrate 11 even if the pressing member 75 is a rigid body. In assembling the display device 100, the PDP 1 to which the pressing member 75 has been pasted may be housed in the housing 71, or conversely, the housing 7 to which the pressing member 75 has been pasted.
1 may contain PDP1.

FIG. 5 is a schematic view of a modified example of the main structure of the display device. In the illustrated display device 100b, the pressing member 75b is integrated with the housing 71b. That is, a part of the housing 71b functions as the pressing member 75b.

FIG. 6 is a plan view showing another example of the pressing member. In FIG. 6 (A), the pressing members 77 are arranged in a ring 4
It is composed of individual part pieces 771, 772, 773, 774. By applying a pressing force to the annular area surrounding the display area 60, it is possible to save the trouble of confirming where around the display area 60 the part where the sound is generated. In FIG. 6B, a large number of small pressing members 78 are arranged so as to line up in a ring shape surrounding the display area 60. The distance D5 between the pressing members 78 adjacent to each other is selected to be 40 mm or less which is the value of the beam length D3, and thereby the same sound countermeasure effect as when the annular pressing members 75 and 77 are arranged can be obtained. . When a part of the housing is used as the pressing member as described above, a plurality of protrusions arranged in a ring may be formed on the inner surface of the housing.

FIG. 7 is a schematic view of the main structure of another display device. The display device 101 includes a filter 81 for blocking electromagnetic waves, adjusting colors, and reducing infrared rays. The filter 81 is 2 mm from the front of the PDP 1.
They are placed about 3 mm apart. A frame 76 for supporting the filter 81 also serves as a pressing member for suppressing microvibration of the PDP 1. The PDP 1 is fixed to the housing 72 by attaching the drive unit 50 attached to the back surface thereof to the housing 72. The front surface of the PDP 1 is indirectly pressed by the front surface portion of the housing 72 via the frame 76.

Although the form in which the periphery of the display area 60 is pressed uniformly has been described above, there is a form in which the display region 60 is partially pressed. If this is adopted, the presence or absence of vibration noise and the location of occurrence of vibration noise are detected when the assembled PDP 1 is driven to perform the aging and operation test. When vibrating sound is generated, the pressing member 78 is arranged only at the position where the vibrating sound is generated, and the PDP 1 is assembled to the housing 71. The pressing member 78 may be fixed to the PDP 1 in advance before assembling, or the pressing member 78 may be attached to the PDP 1 and the housing 7 at the time of assembly.
It may be sandwiched between 1 and 1.

In the above embodiment, when the film-shaped filter is attached to the outer surface of the glass substrate 11, the surface of the filter can be regarded as the substrate surface. That is,
Vibration noise can be reduced by pressing the filter. The structures, shapes, and materials of the casings 71 and 72 are not limited as long as they are structures that cover the front surface of the PDP 1. It may be a composite of metal and resin.

[0018]

According to the inventions of claims 1 to 9, the operating noise due to the resonance of the substrate can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a display device according to the present invention.

FIG. 2 is a diagram showing an example of a cell structure of a PDP.

FIG. 3 is a schematic diagram of a main part structure of a display device.

FIG. 4 is a diagram showing an example of a planar shape of a pressing member.

FIG. 5 is a schematic diagram of a modified example of the main structure of the display device.

FIG. 6 is a plan view showing another example of the pressing member.

FIG. 7 is a schematic view of a main part structure of another display device.

FIG. 8 is a plan view showing another example of the arrangement of the pressing member.

[Explanation of symbols]

1 PDP (plasma display panel) 29 partitions 31 row space (opposing gap) 71, 72 housing 75,76,77,78 Pressing member (projection) 771,772,773,774

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayuki Shibata             3-2-1 Sakado, Takatsu-ku, Kawasaki City, Kanagawa Prefecture               Fujitsu Hitachi Plasma Display Stock Association             In-house (72) Inventor Takashi Sasaki             3-2-1 Sakado, Takatsu-ku, Kawasaki City, Kanagawa Prefecture               Fujitsu Hitachi Plasma Display Stock Association             In-house F-term (reference) 5C040 FA01 FA04 GB03 MA09 MA30                 5C058 AA11 AB01 AB06 BA35                 5C094 AA36 AA47 BA01 BA12 BA31                       CA19 FB20 GB01 HA08 JA08                 5G435 AA07 BB06 CC09 EE06 EE13                       GG43 HH18 KK02 LL04

Claims (9)

[Claims] 1. A plasma display panel having a structure in which a size of a facing gap of a substrate pair is determined by a partition wall that defines an internal space, and a housing that houses the plasma display panel, wherein: A ring-shaped region, which is outside the display region and inside the encapsulant that joins the substrate pair around the facing gap, has a circumference of 40 m.
A plasma display device, wherein the casings contact each other at an interval of m or less, and a pressing force for reducing the vibration of the substrate pair is applied thereby. 2. A plasma display panel having a structure in which a size of a facing gap between a pair of substrates is determined by a partition wall defining an internal space, a housing for housing the plasma display panel, an inner surface of the housing, and the plasma display panel. And a pressing member for applying a pressing force to the outer surface of the substrate pair, the region of the substrate pair in contact with the pressing member is configured to join the substrate pair around the facing gap. A plasma display device, which is an area inside the material and outside the display area. 3. The plasma display device according to claim 2, wherein the plan view shape of the pressing member is an annular shape surrounding the display area. 4. The plasma display device according to claim 2, wherein the pressing member is an elastic body. 5. The plasma display device according to claim 2, wherein the pressing member is a rigid body. 6. The plasma display device according to claim 2, wherein the pressing member is composed of a plurality of partial pieces. 7. A plasma display panel having a structure in which a size of a facing gap between a pair of substrates is determined by a partition wall defining an internal space, and a housing for housing the plasma display panel, and the plasma display panel is further driven. A pressing member that presses the outer surface of the substrate pair at the vibration generating location so as to reduce the vibration of the substrate that is generated at the time is arranged between the plasma display panel and the inner surface of the housing. Plasma display device. 8. A partition which defines an inner space and has a structure in which a size of a facing gap of the substrate pair is determined, and an annular protrusion surrounding the display area or a plurality of annular protrusions surrounding the display area on an outer surface of the substrate pair. And a region where the protrusions are arranged is inside the encapsulating material that joins the pair of substrates around the facing gap and outside the display region. 9. A plasma display panel having a structure in which a size of a facing gap of a substrate pair is determined by a partition wall defining an internal space to detect the presence or absence of a vibrating sound and a location where the vibrating sound is generated. A plasma display device, characterized in that a pressing member that forms a protrusion for contacting a housing that houses the plasma display panel is arranged at a sound generation location, and then the plasma display panel is assembled to the housing. How to assemble.