JP2009020149A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the stress applied to a panel and suppress the amount of deformation of the panel even in a case of a large screen plasma display panel using a thin glass plate. <P>SOLUTION: A plasma display device has a panel and a chassis 51 holding the panel. The chassis 51 includes: a chassis member 61; an upper reinforcement member 62a and a lower reinforcement member 62b reinforcing the chassis member 61; and a frame 58 linking the upper reinforcement member 62a and the lower reinforcement member 62b. When a central line in the direction parallel to the long side of the chassis 51 is set as an x-axis, a central line in the direction parallel to the short side of the chassis 51 as a y-axis, y-coordinate of the end of the lower long side of the chassis 51 as "-1", y-coordinate of the end of the upper long side of the chassis 51 as "1", and the y-coordinate between them as -1<y<1, the frame 58 is attached to the chassis 51 at the positions -0.79≤y≤-0.55 and 0.55≤y≤0.79. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plasma display device which is an image display device using a plasma display panel.

  A plasma display device using a typical plasma display panel (hereinafter simply abbreviated as “panel”) as an image display element has a wide viewing angle and is easy to enlarge, and is self-luminous and has an image display quality. Is becoming the mainstream of large-screen image display devices.

  The panel comprises a large number of discharge cells between a glass front plate and a back plate arranged opposite to each other. Display electrode pairs are formed on the front plate, and barrier ribs that partition discharge cells are formed on the back plate. If the screen size is a panel corresponding to 42 inches, the size of the front plate and the back plate is, for example, 980 mm × 570 mm, and the thickness thereof is, for example, 2.8 mm.

In addition, the plasma display device is configured such that such a panel and its driving circuit are housed in a housing formed of a front frame and a back cover. A front filter is fitted in the front frame. Since the panel is vulnerable to mechanical stress, various arrangements have been made to prevent the panel from being stressed with respect to the structure for housing the panel in the housing. For example, Patent Document 1 discloses a plasma display device in which a panel is attached to a chassis with an elastic sheet interposed therebetween, and a drive circuit or the like is further mounted on the chassis to suppress stress applied to the panel.
Japanese Patent No. 3499847

  However, in recent years, the glass plates used for the front plate and the back plate have been made thinner, while the size of the panel has been increased, and the amount of deformation of the panel with respect to stress has increased. For this reason, for example, there has been a high risk that the panel and the front filter collide due to a drop impact or the like during transportation and the panel is destroyed. Therefore, development of a panel holding structure that is less stressful than before is strongly desired.

  The plasma display device of the present invention has been made in view of these problems. Even in a large screen panel using a thin glass plate, the stress applied to the panel is suppressed and the deformation amount of the panel is suppressed. An object of the present invention is to provide a plasma display device having a holding structure that does not break.

  In order to achieve the above object, the present invention provides a plasma display device comprising a panel and a chassis for holding the panel, the chassis having a short cross section on each of the upper long side and the lower long side. A chassis member having a bent portion with a bent portion, and an upper reinforcing member for reinforcing the chassis member by fixing one side at the upper bent portion of the chassis member and fixing the other side other than the bent portion. A lower reinforcing member that reinforces the chassis member by fixing one side at the lower bent portion of the chassis member and fixing the other side other than the bent portion, and an upper reinforcing member and a lower reinforcing member A center line in a direction parallel to the long side of the chassis as an x-axis and a center line in a direction parallel to the short side of the chassis as a y-axis, with the end of the long side below the chassis Y coordinate of -1 and y coordinate of the end of the upper long side 1. When the y-coordinate between them is -1 <y <1, the frame is placed on the chassis at a position of −0.79 ≦ y ≦ −0.55 and a position of 0.55 ≦ y ≦ 0.79. It is installed. With this configuration, even for a large screen panel using a thin glass plate, a plasma display device having a holding structure that suppresses stress applied to the panel and suppresses deformation of the panel and does not break the panel. Can be provided.

  In addition, the plasma display apparatus of the present invention includes at least two frames, the x coordinate of the short side end of the left side of the chassis is -1, the x coordinate of the right side of the short side is 1, and between them When the x coordinate of -1 <x <1, one frame is attached to the chassis at a position of −0.67 ≦ x ≦ −0.44, and the other frame is 0.44 ≦ x ≦ 0.67. It is desirable to attach to the chassis at the position.

  In the plasma display device of the present invention, the upper bent portion and the lower bent portion of the chassis member are provided with holes, the upper reinforcing member and the lower reinforcing member are provided with protruding portions, and the protruding portions are bent. It may be inserted into the hole of the bent portion, and one side of the upper reinforcing member may be fixed to the upper bent portion, and one side of the lower reinforcing member may be fixed to the lower bent portion.

  According to the present invention, even a large-screen panel using a thin glass plate suppresses stress applied to the panel and suppresses the amount of deformation of the panel, and has a holding structure that does not break the panel. An apparatus can be provided.

  Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is an exploded perspective view showing a main part of a panel used in the plasma display device according to the embodiment of the present invention. The panel 10 is configured such that a glass front substrate 21 and a rear substrate 31 are arranged to face each other and a discharge space is formed therebetween. On the front substrate 21, a plurality of display electrode pairs 24 including scan electrodes 22 and sustain electrodes 23 are formed. A dielectric layer 25 is formed so as to cover the display electrode pair 24, and a protective layer 26 is formed on the dielectric layer 25. A plurality of data electrodes 32 are formed in parallel on the back substrate 31, an insulating layer 33 is formed so as to cover the data electrodes 32, and a grid-like partition wall 34 is provided on the insulating layer 33. Yes. A phosphor layer 35 is provided on the surface of the insulator layer 33 and the side surfaces of the partition walls 34. The front substrate 21 and the rear substrate 31 are arranged to face each other so that the scan electrode 22 and the sustain electrode 23 and the data electrode 32 intersect each other, and in the discharge space formed therebetween, for example, neon And a mixed gas of xenon. Note that the structure of the panel is not limited to the above-described structure, and for example, a structure having a stripe-shaped partition may be used. In addition, if the size of the front substrate 21 and the back substrate 31 is a panel corresponding to 60 inches, it is 1500 mm × 870 mm, for example, and the thickness is 1.8 mm, for example.

  FIG. 2 is an exploded perspective view showing the structure of the plasma display device 50 according to the embodiment of the present invention. The plasma display device 50 includes a panel 10, a chassis 51 that holds the panel 10, a heat conductive sheet 52 that transfers heat generated in the panel 10 to the chassis 51 and bonds the panel 10 and the chassis 51, and scanning. A circuit block 53 for driving the panel 10, such as an electrode drive circuit, a sustain electrode drive circuit, a data electrode drive circuit, a timing generation circuit, and a power supply circuit block, and a front frame 54 and a back cover 55 for housing them are provided. A front filter 56 having functions such as an optical filter and an EMI filter is fitted in the front frame 54. A frame 58 is attached to the chassis 51 via a support member 57.

  3 is a diagram showing the structure of the chassis 51 and the frame 58 of the plasma display device 50 according to the embodiment of the present invention. FIG. 3A is a front view seen from the back cover 55 side, and FIG. FIG. 3 is a side sectional view. The chassis 51 includes a chassis member 61 having a bent portion in which a short portion of each of the upper long side and the lower long side of the aluminum plate is bent to have an L-shaped cross section, and the chassis member 61 is reinforced. And an upper reinforcing member 62b and a lower reinforcing member 62b. The upper reinforcing member 62a has one side fixed at the upper bent portion of the chassis member 61 and the other side fixed at other than the bent portion, and has a hollow elongated space having a rectangular, square, trapezoidal or the like in cross section. It is attached to the upper side of the long side of the chassis member 61 so as to form 63a (hereinafter abbreviated as “box-shaped space”). The lower reinforcing member 62b is configured such that one side is fixed at the lower bent portion of the chassis member 61 and the other side is fixed at other than the bent portion to form a box-shaped space 63b. It is attached to the lower side of the long side of 61. In the present embodiment, a left frame 58L and a right frame 58R that connect the upper reinforcing member 62a and the lower reinforcing member 62b are attached via respective support members 57.

  FIG. 4 is an attachment view of the reinforcing member 62a of the plasma display device 50 according to the embodiment of the present invention. A plurality of holes 72 for fitting the upper reinforcing member 62a are provided in the upper bent portion 71a which is bent at the end portion on the long side of the chassis member 61. The reinforcing member 62a is bent into an L shape at two locations as shown in FIG. The reinforcing member 62a is provided with a plurality of projecting portions 75 for being inserted and fixed in the holes 72, and further provided with screw holes 74 for fixing to the chassis member 61 and screw holes for fixing the support member 57. .

  In order to attach the reinforcing member 62a to the chassis member 61, the protruding portion 75 of the reinforcing member 62a is inserted into the hole 72 of the bent portion 71a of the chassis member 61, and then the reinforcing member 62a is attached to the chassis other than the bent portion with a screw 73. Fix to member 61. In order to attach the frame 58 to the chassis 51, first, a support member 57 made of synthetic resin is attached to the reinforcing member 62 a with four screws 76, and the frame 58 is attached to the support member 57 with bolts 77. The optimum mounting position of the frame 58 will be described later.

  Thus, in the present embodiment, the upper reinforcing member 62a and the chassis member 61 are joined so as to form a box-shaped space 63a. Although not shown in FIG. 4, the lower reinforcing member 62b is similarly coupled to the chassis member 61 so as to form a box-shaped space 63b. Therefore, the rigidity of the chassis 51 can be significantly improved without increasing the weight of the chassis 51.

  In the chassis 51 of the present embodiment, an L-shaped bending process is performed on each of the upper and lower sides on the long side of the chassis member 61, and an upper reinforcing member 62a is provided on each of the upper and lower sides on the long side. The lower reinforcing member 62b is attached, and the frame 58 is further attached so as to connect the upper reinforcing member 62a and the lower reinforcing member 62b. Therefore, the upper reinforcing member 62a and the lower reinforcing member 62b increase the rigidity of the chassis 51 in the horizontal direction of FIG. 3A, and the frame 58 supports the chassis 51 in the vertical direction of FIG. Increased rigidity. In addition, since the weight is distributed over the entire chassis 51 including the upper and lower sides on the long side of the chassis member 61, the deformation of the chassis 51 is suppressed, and the panel 10 is not subjected to great stress and is damaged. No longer give.

  Further, in the present embodiment, the chassis 51 is fixed to the space formed by the front frame 54 and the back cover 55 using the frame 58, so that impacts such as dropping and falling during the transport of the plasma display device 50 are reduced. ing. FIG. 5 is a side cross-sectional view of plasma display device 50 in accordance with the exemplary embodiment of the present invention. FIG. 5 shows the front frame 54, the panel 10, the chassis 51, the support member 57, the frame 58, and the back cover 55, but the circuit block 53 and the like are omitted. As described above, the chassis 51 is fixed to the space inside the housing formed by the front frame 54 and the back cover 55 via the frame 58 and the support member 57. In other words, the chassis 51 is not directly fixed to the front frame 54 or the back cover 55, but is fixed in a suspended state in the space inside the housing by the support member 57 and the frame 58. Therefore, the impact applied to the plasma display device 50, that is, the impact applied to the front frame 54 or the back cover 55 does not directly propagate to the chassis 51. Further, the impact transmitted to the frame 58 does not concentrate on a specific point of the chassis 51, and passes through the upper reinforcing member 62 a and the lower reinforcing member 62 b that form the strong box-shaped spaces 63 a and 63 b. Since the upper and lower sides on the long side of the member 61 are dispersed throughout the chassis 51, the deformation of the chassis 51 is unlikely to occur and the stress applied to the panel 10 can be reduced.

  Next, in order to obtain the optimum mounting position of the frame 58, the displacement amount ΔZ of the chassis 51 when the plasma display device 50 received a drop impact was calculated. The calculation method is to independently calculate the displacement amount of the frame 58 and the displacement amount of the chassis 51 to which the panel 10 is attached when a drop impact of 15 G is given with the image display surface of the plasma display device 50 facing down. The sum of them was defined as the total displacement amount ΔZ of the chassis 51. In the actual drop impact, the front filter 56 is also displaced, and the panel 10 and the front filter 56 are more likely to collide. However, since the displacement amount of the front filter 56 is small and the displacement amount of the front filter 56 does not depend on the mounting position of the frame 58, the displacement of the front filter 56 is ignored in the following calculation.

  FIG. 6 is an explanatory diagram of coordinates (x, y) for indicating a position on the chassis 51.

  In the following description, the center line in the direction parallel to the long side of the chassis 51 is defined as the x axis, and the center line in the direction parallel to the short side is defined as the y axis. Then, the y coordinate of the end portion of the lower long side of the chassis 51 is -1, the y coordinate of the end portion of the upper long side is 1, and the y coordinate therebetween is -1 <y <1, and the chassis 51 The x coordinate of the end of the short side on the left side is defined as -1, the x coordinate of the end of the short side on the right side is defined as 1, and the x coordinate between them is defined as -1 <x <1. Thus, as coordinates (x, y) for indicating the position on the chassis 51, relative coordinates satisfying −1 ≦ x ≦ 1 and −1 ≦ y ≦ 1 are adopted regardless of the size of the chassis 51. . This is for directly comparing the data of the chassis 51 having different sizes.

  Under such a definition, the left frame 58L has two positions symmetric with respect to the x axis, (−xo, yo), (−xo, −yo) (where 0 ≦ xo ≦ 1, 0). ≦ yo ≦ 1) is attached to the chassis 51, and the right frame 58R is attached to the chassis 51 at two positions symmetrical to the x axis, (xo, yo), (xo, −yo). It shall be.

  When the x-axis and the y-axis are defined as described above, the displacement of the chassis 51 due to the impact occurs in the z-axis direction orthogonal to the x-axis and the y-axis. FIG. 7 is a diagram illustrating a calculation result of the displacement amount ΔZ of the chassis 51 of the plasma display device 50 according to the embodiment of the present invention. FIG. 7A illustrates the y coordinate of the mounting position of the frame 58 and the chassis 51. FIG. 7B shows the relationship between the x coordinate of the mounting position of the frame 58 and the displacement amount ΔZ of the chassis 51. 7 (a) and 7 (b) are the results of calculation assuming a 42 mm plasma display device 50. FIG. The panel 10 has a screen size of 42 inches and a thickness of 3.8 mm, the chassis 51 has a size of 980 mm × 580 mm and a thickness of 1.5 mm, the frame 58 has a length of 590 mm, a width of 52 mm, and a thickness of 1. It was assumed that the cross section had a U-shaped bend with a 6 mm iron material.

  The displacement amount ΔZ of the chassis 51 becomes maximum at the central portion (x, y) = (0, 0) or the four corner portions (x, y) = (± 1, ± 1) of the chassis 51, and the central portion or the four corners. Since the panel 10 and the front filter 56 are likely to collide with each other in FIG. 7A and FIG. 7B, the displacement amount ΔZc of the central portion and the four corner portions are shown as the displacement amount ΔZ of the chassis 51. The displacement amount ΔZe at.

  First, the y coordinate of the optimum mounting position of the frame 58 is obtained using FIG. As shown in FIG. 7A, when the coordinate yo of the mounting position of the frame 58 approaches “1”, the displacement amount ΔZe at the four corners of the chassis 51 decreases, and the coordinate yo of the mounting position approaches “0”. Accordingly, the displacement amount ΔZe tends to increase. This is because both ends of the frame 58 are fixed to the front frame 54 and the back cover 55, and the frame 58 is attached to the upper side of the chassis 51 at positions close to the upper long side and the lower long side. Since the long side and the lower long side are also indirectly fixed to the front frame 54, the displacement amount ΔZe at the four corners of the chassis 51 is also reduced. On the other hand, when the frame 58 is attached at a position close to the x-axis of the chassis 51, the frame 58 is deformed like a leaf spring, and the entire chassis 51 is vibrated in the front-rear direction (z direction). Due to the occurrence of vibration, the amplitude of the peripheral portion of the chassis 51 is increased, so that the displacement amount ΔZe is increased.

  Further, the displacement amount ΔZc in the central portion of the chassis 51 becomes large and becomes the minimum at a specific attachment position regardless of whether the attachment position yo of the frame 58 approaches “0” or “1”. The reason why the displacement amount ΔZc increases when the frame 58 mounting position yo approaches “1” is that the frame 58 is mounted at positions close to the upper long side and the lower long side of the chassis 51, thereby reducing the mounting position. This is because a vibration at the center of the chassis 51 is increased. Further, when the frame 58 is mounted at a position close to the x-axis, the displacement amount ΔZc increases as described above. As described above, the frame 58 deforms like a leaf spring, and the entire chassis 51 vibrates in the front-rear direction (Z direction). For this reason, it is considered that the displacement amount ΔZc increases as well as the displacement amount ΔZe.

  As described above, from the calculation result shown in FIG. 7A, the mounting position yo where the maximum value of the displacement amount ΔZe and the displacement amount ΔZc, max (ΔZe, ΔZc) is the smallest, is yo = 0. It can be seen that it is 69. At this time, the displacement amount ΔZc at the center is a minimum value of 3.4 mm. Further, when the mounting position yo of the frame 58 is 0.55 mm, the displacement amount ΔZe and the displacement amount ΔZc are both equal to 3.9 mm, and when the mounting position yo is smaller than that, the displacement amount ΔZe increases rapidly. Therefore, when the attachment position yo of the frame 58 having a deformation amount of 3.9 mm or less is obtained, 0.55 ≦ yo ≦ 0.81, which is the desired y coordinate of the attachment position of the frame 58.

  Next, using FIG. 7B, the x coordinate of the optimum mounting position of the frame 58 is obtained. As shown in FIG. 7B, when the coordinate xo of the mounting position of the frame 58 approaches “1”, the displacement amount ΔZe at the four corners of the chassis 51 is small, and the displacement amount ΔZc at the center portion of the chassis 51 is large. Become. Conversely, as the coordinate xo of the attachment position of the frame 58 approaches the y-axis, the displacement amount ΔZe at the four corners of the chassis 51 increases, and the displacement amount ΔZc at the center portion of the chassis 51 decreases. This is considered to be because vibrations having a node at the attachment position of the frame 58 are generated in the chassis 51. That is, when the frame 58 is attached at positions close to the short side on the left side and the short side on the right side of the chassis 51, vibration with the attachment position as a node is generated, and the amplitude of the central portion of the chassis 51 is increased. Further, when the frame 58 is attached at a position close to the y-axis of the chassis 51, vibration having the position as a node is generated, and the amplitude of the four corner portions of the chassis 51 is increased.

  Here again, when the attachment position xo of the frame 58 where the larger value of the displacement amount ΔZe and the displacement amount ΔZc, max (ΔZe, ΔZc) is 3.9 mm or less is obtained, 0.42 ≦ xo ≦ 0.68 is desirable. The mounting position xo of the frame 58 is obtained.

  The present inventors performed the same calculation for the plasma display device 50 of 37 mm and 50 mm in addition to 42 mm, and obtained a desirable mounting position of the frame 58. FIG. 8 is a diagram showing a desired mounting position of the frame 58 of the plasma display apparatus 50 according to the embodiment of the present invention. FIG. 8A shows the coordinates yo of the mounting position of the desired frame 58 in each screen size. FIG. 8B shows the coordinates xo of the mounting position of the desired frame 58 for each screen size. As described above, the desirable mounting position of the frame 58 in the plasma display device 50 of 37 mm, 42 mm, and 50 mm is substantially constant even if the screen size of the panel 10 changes. And even if it is the big screen panel 10 using a thin glass plate by attaching the flame | frame 58 in the range of 0.55 <= yo <= 0.79, 0.44 <= xo <= 0.67, it adds to the panel 10 It was revealed that the stress of the panel 10 can be suppressed and the amount of deformation of the panel 10 can be suppressed to prevent the panel 10 from being damaged.

  In the present embodiment, the structure in which the frame 58 is attached using the support member 57 has been described. However, the present invention can also be applied to a structure in which the frame 58 is attached without using the support member 57. However, the use of the support member 57 using an insulating material can suppress the generation of noise due to a change in magnetic flux during operation.

  Further, the reinforcing members 62a and 62b may further be provided with screw holes for attaching a drive circuit board or the like. Furthermore, if bosses are formed on the reinforcing members 62a and 62b by drawing or cutting and bending, the number of caulking bosses and positioning pins used can be reduced, and the cost of the plasma display device 50 can be reduced.

  Even if the present invention is a large screen panel using a thin glass plate, the stress applied to the panel can be suppressed and the amount of deformation of the panel can be suppressed. Therefore, the plasma display device having a holding structure that does not break the panel Useful as.

The disassembled perspective view which shows the principal part of the panel used for the plasma display apparatus in embodiment of this invention. An exploded perspective view showing the structure of the plasma display device The figure which shows the structure of the chassis and flame | frame of the plasma display apparatus Mounting diagram of the reinforcing member of the plasma display device Side view of the plasma display device Explanatory drawing of coordinates (x, y) to indicate the position on the chassis The figure which shows the calculation result of the displacement amount of the chassis of the plasma display device The figure which shows the attachment position of the flame | frame of the plasma display apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Panel 50 Plasma display apparatus 51 Chassis 52 Thermal conductive sheet 53 Circuit block 54 Front frame 55 Back cover 56 Front filter 57 Support member 58 Frame 58L Left frame 58R Right frame 61 Chassis member 62 Reinforcement member 62a (Upper) reinforcement member 62b (lower) reinforcing member 71a (upper) bent part 72 hole 74 screw hole 75 projecting part

Claims (3)

A plasma display device comprising a plasma display panel and a chassis for holding the plasma display panel,
The chassis includes a chassis member having a bent portion in which a short portion of each of the upper long side and the lower long side is bent, and one side is fixed at the upper bent portion of the chassis member and the other side. The upper reinforcing member that reinforces the chassis member by fixing it at a portion other than the bent portion, and one side that is fixed at the lower bent portion of the chassis member and the other side that is fixed at other than the bent portion A lower reinforcing member that reinforces the chassis member, and a frame that connects the upper reinforcing member and the lower reinforcing member,
The center line in the direction parallel to the long side of the chassis is the x axis, the center line in the direction parallel to the short side of the chassis is the y axis, and the y coordinate of the end of the long side below the chassis is −1. When the y coordinate of the end of the upper long side is 1, and the y coordinate between them is -1 <y <1, the frame is set to a position of -0.79 ≦ y ≦ −0.55 and 0. A plasma display device mounted on the chassis at a position of 55 ≦ y ≦ 0.79. Comprising at least two said frames;
When the x coordinate of the end of the short side on the left side of the chassis is -1, the x coordinate of the end of the short side of the right side is 1, and the x coordinate between them is -1 <x <1, A frame is attached to the chassis at a position of −0.67 ≦ x ≦ −0.44, and the other frame is attached to the chassis at a position of 0.44 ≦ x ≦ 0.67. Item 2. The plasma display device according to Item 1. A hole is provided in the upper bent portion and the lower bent portion of the chassis member, and a protruding portion is provided in the upper reinforcing member and the lower reinforcing member, and the protruding portion is disposed on the bent portion. One side of the upper reinforcing member is fixed to the upper bent portion, and one side of the lower reinforcing member is fixed to the lower bent portion. The plasma display device according to claim 1.

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