JP2011022381A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shield unwanted radiation of an electromagnetic wave from a display panel or the like in a display device, and to improve workability in assembling the display device. <P>SOLUTION: The display device includes a conductive back cover arranged on the rear surface side of the display panel, and a conductive frame body that is arranged so as to surround the display panel, holds the back cover, and is electrically connected to the back cover. The frame body includes: a first positioning wall for positioning the holding position of the back cover in the longitudinal direction of the display panel; and a second positioning wall for positioning the holding position of the back cover in the direction orthogonal to the longitudinal direction. A leaf spring is formed substantially continuously along an edge of the square back cover, the contact state of the first positioning wall and second positioning wall with the leaf spring is held while the leaf spring is elastically compressed in the second direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a large-screen thin display device, for example, a plasma display device, a liquid crystal display device, and an organic EL display device.

  2. Description of the Related Art Self-luminous display devices such as a plasma display device and a CRT display (Cathode-Ray Tube display) device are widely used because a natural image can be obtained without dependency on a viewing angle. In particular, plasma display devices are rapidly spreading because they are thin and optimal for constructing a large screen. In addition, liquid crystal display devices and organic EL display devices are becoming thinner and larger.

  The plasma display apparatus is mainly composed of a plasma display module having a plasma display panel and a conductive casing that surrounds and shields the module. This plasma display panel is a display that generates visible light by exciting phosphors provided in each discharge cell by ultraviolet rays generated by gas discharge to generate display light. In the plasma display panel, a plurality of electrodes (a display electrode pair and an address electrode) are arranged in a lattice pattern, and an image is formed by selectively emitting light from discharge cells that intersect each electrode. Due to this principle, a large current for driving flows through the electrodes, and an electromagnetic field is generated by this current from the plasma display module.

  In order to shield (shield) the electromagnetic field generated in this way from leaking outside the display device, the housing includes, for example, a front glass on which a conductive filter is attached and a conductive back on the back side. The cover is connected with a conductive member to surround the plasma display module. In the conventional plasma display device having such a configuration, it is possible to electromagnetically shield the generated electromagnetic field. However, since a shield structure (a shielded housing) is configured by a plurality of components, the components are not separated from each other. There exists a subject that it is necessary to connect electrically stably.

  In response to such a conventional problem, the metal formed by dividing the strip into a strip shape with a predetermined interval in the long side direction at the junction with the back cover located on the side of the plasma display panel There has been proposed a structure in which a comb-shaped leaf spring is pressed and brought into contact with a joint portion of the back cover with a filter holding means using a comb-shaped leaf spring that is an elastic body (see, for example, Patent Document 1). ).

  Further, in the liquid crystal display device, the casing is provided with a shield member provided with a plurality of spring fingers arranged in parallel on the entire circumference surrounding the opening, and each spring finger and the back cover in the shield member are provided. Have been proposed (for example, Patent Document 2).

JP-A-2005-72517 JP 2000-181362 A

  However, in the configuration proposed in Patent Document 1, it is necessary to process the side portion of the back cover so as to be long and thin in the thickness direction of the display device. Therefore, if the size of the back cover increases with the increase in the screen size of the display device, the accuracy of parts on the sides of the back cover will deteriorate, for example, warpage will occur, and the contact resistance between both parts will not be partially stabilized. There is a problem that the shielding performance is lowered.

  Further, in the configuration as proposed in Patent Document 2, a plurality of spring fingers are necessary for the shield member due to the structure, and between the spring fingers due to variations in the spring fingers themselves or an increase in the size of the shield member due to an increase in the panel size. There is a problem that variation in the pressing force due to the positional deviation occurs, and the shielding performance is not stable.

  As described above, in the configuration of the conventional display device, as the display panel is increased in size, the components and joints constituting the shield housing are easily affected by the positional accuracy, and the conductive contact of the joint is stable. Therefore, there is a problem that the required shielding performance cannot be obtained sufficiently.

  Further, in the configurations of Patent Document 1 and Patent Document 2, it is necessary to engage the comb-shaped leaf springs or spring fingers provided at predetermined intervals with the back cover when the display device is assembled. However, as the display panel increases in size, the back cover also increases in size, and the task of engaging the relatively thin and large back cover with the comb-shaped leaf springs and spring fingers becomes more difficult. .

  Accordingly, an object of the present invention is to solve the above-described problem, and in the display device, unnecessary electromagnetic radiation from components such as a display panel can be stably shielded, and workability in the assembly is improved. It is to provide an improved display device.

  In order to achieve the above object, the present invention is configured as follows.

According to a first aspect of the present invention, a display panel;
A conductive filter disposed on the front side of the display panel;
A conductive back cover disposed on the back side of the display panel;
A conductive frame disposed around the display panel to hold the back cover and electrically connected to the filter and the back cover;
The frame includes a first positioning wall that positions the holding position of the back cover in a first direction that is the thickness direction of the display panel, and a holding position of the back cover in a second direction that is orthogonal to the first direction. A second positioning wall for positioning,
A leaf spring is formed substantially continuously along the edge on at least one edge of the quadrangular back cover, and the leaf spring is elastically compressed in the second direction. Provided is a display device in which a contact state between a wall and a second positioning wall and a leaf spring is maintained.

  According to the second aspect of the present invention, the leaf spring has a folded shape having a leaf spring top on the front side of the display panel, and the leaf spring is elastically compressed in the second direction so that the leaf spring top is A display device according to a first aspect is provided, which is pressed against and in contact with a first positioning wall.

  According to the third aspect of the present invention, the second positioning wall is formed with a recess that is engaged with the end of the edge of the leaf spring, and the end of the edge of the leaf spring and the recess The display device according to the second aspect is provided in which the leaf spring is elastically compressed in the first direction and the second direction with the engagement position as a fulcrum.

  According to the fourth aspect of the present invention, the back cover and the first positioning wall are fixed by the fixing member in the region inside the plate spring top of the plate spring in the back cover, and the fixing position by the fixing member is a fulcrum. As a display device according to the second aspect, the leaf spring is elastically compressed in the first direction and the second direction.

  According to the fifth aspect of the present invention, in the frame, the first positioning wall is a wall provided along the second direction, and the second positioning wall is a wall provided along the first direction. A display device according to any one of the first to fourth aspects is provided.

  According to the sixth aspect of the present invention, in any one of the first to fifth aspects, the leaf spring is formed substantially continuously on at least one pair of edge portions facing each other in the back cover. The display device described in 1. is provided.

  According to the present invention, the frame body is provided with the first positioning wall and the second positioning wall, and the leaf spring formed on the edge of the back cover is elastically compressed in the second direction. The state which contacted the 1st positioning wall and the 2nd positioning wall can be hold | maintained. Therefore, the contact area between the back cover and the frame can be increased, and the stability of the conductive contact can be enhanced by the leaf springs being in electrical contact at two locations. Therefore, in the display device, a shield structure that stably shields unnecessary electromagnetic radiation can be realized. In addition, the leaf spring is formed so as to be substantially continuous along the edge of at least one side of the frame body, so that it does not require complicated positioning work and improves workability during assembly. Can be made.

1 is a schematic front view showing a configuration of a plasma display device according to a first embodiment of the present invention. FIG. 1A is a cross-sectional view taken along the line PP in the plasma display device of FIG. Schematic perspective view showing the configuration of the plasma display module Schematic perspective view showing electrode structure of plasma display panel in plasma display device Schematic sectional view showing the electrode structure of the plasma display panel in the plasma display device Schematic perspective view showing structure of conductive front filter Schematic which shows the connection structure of the frame and back cover in the plasma display apparatus of 1st Embodiment. Schematic which shows the connection structure of the frame and back cover in the plasma display apparatus concerning 2nd Embodiment of this invention. Schematic which shows the connection structure of the frame and back cover in the modification of the plasma display apparatus of 2nd Embodiment. Schematic which shows the connection structure of the frame and back cover in the plasma display apparatus concerning 3rd Embodiment of this invention. Schematic which shows the connection structure of the frame and back cover in the plasma display apparatus concerning 4th Embodiment of this invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the accompanying drawings, the same parts are denoted by the same reference numerals, and the description thereof may be omitted.

(First embodiment)
First, the structure of a plasma display device as an example of the display device according to the first embodiment of the present invention will be described.

  FIG. 1A is a front view showing the configuration of the plasma display device according to the first embodiment, and FIG. 1B is a cross-sectional view taken along the line P-P in FIG. 1A, and mainly shows only components that are deeply related to unwanted electromagnetic radiation. Show. FIG. 2 is a perspective view showing the configuration of the plasma display module in the plasma display device of the first embodiment, and FIG. 3A is a perspective view showing the electrode structure of the plasma display panel in the plasma display device of the first embodiment. 3B is a sectional view thereof. FIG. 4 is a perspective view showing the structure of the conductive front filter in the plasma display device of the first embodiment, and FIG. 5 is a schematic view showing the electrical connection structure between the chassis conductor and the glass pressing metal. In the following description, the normal direction of the display surface of the plasma display device may be referred to as the x direction, the longitudinal direction of the display surface of the plasma display device may be referred to as the y direction, and the direction orthogonal to the x direction and the y direction may be referred to as the z direction. is there.

  As shown in FIG. 1A, FIG. 1B and FIG. 2 (particularly as shown in FIG. 2), in the plasma display module 2 included in the plasma display device 1 of the first embodiment, it is parallel to the longitudinal direction (y direction). On the non-display surface side of the plasma display panel 10 having the scanning / sustaining electrodes 14 and the address electrodes 15 parallel to the short direction (z direction), a chassis conductor 11 as a holding plate of the plasma display panel 10 is a heat conductive sheet (see FIG. (Not shown). The direction indicated by the arrow in the x direction in the figure is the display surface direction (front side) of the plasma display panel 10, and the opposite direction is the non-display surface direction (back side).

  As shown in FIG. 2, on the rear side of the chassis conductor 11, a scanning / sustaining electrode driving circuit board 12a, an address electrode driving circuit board 12b, a relay circuit board 12c, and a discharge control circuit board 12d are arranged. In the scan / sustain electrode 14, the drive signal generated from the scan / sustain electrode drive circuit board 12a is transmitted to the scan / sustain electrode 14 of the plasma display panel 10 by the flexible cable 13a. In the address electrode 15, the high frequency signal generated in the discharge control circuit board 12d is transmitted to the relay circuit board 12c by the flexible cable 13d, and further transmitted to the address electrode drive circuit board 12b by the flexible cable 13c. In the address electrode drive circuit board 12b, a drive signal is generated and transmitted to the address electrode 15 of the plasma display panel 10 through the flexible cable 13b.

  As shown in FIG. 1B, on the outside of the plasma display module 2, there is a shield case including a back cover 16, a frame-shaped casing (an example of a frame) 17, a conductive front filter 20, and a conductive gasket 21. The body is placed. In other words, the plasma display module 2 is surrounded by a shield housing. In the example of the first embodiment, the front cabinet 19 is composed of the same components as the housing 17.

  3A and 3B, the plasma display panel 10 has a structure in which a front glass plate 101 and a back glass plate 102 are bonded together. A dielectric layer 103 is formed on the front glass plate 101, and a large number of scan / sustain electrodes 14 including scan electrodes 14 a and sustain electrodes 14 b are protected by the dielectric layer 103. A dielectric layer 103 is also formed on the rear glass plate 102, and a large number of address electrodes 15 are formed so as to be protected by the dielectric layer 103.

  As shown in FIG. 3B, at the intersection between the scan / sustain electrode 14 and the address electrode 15, a portion sandwiched between the scan / sustain electrode 14 and the address electrode 15 is a discharge cell 104. Is filled with a discharge gas containing a rare gas such as helium (He), neon (Ne), or xenon (Xe). The discharge cell 104 is divided and formed by a partition wall 105, and the inside of each discharge cell 104 is separately coated with red, blue, and green phosphors 106a, 106b, and 106c.

  The chassis conductor 11 is made of a metal plate such as aluminum or copper having high thermal conductivity and high electrical conductivity. The plasma display panel 10 is attached to one surface (front surface) via a heat conductive sheet, and the other surface. On the (rear surface), each drive circuit board or the like is mounted so as to be parallel to the chassis conductor 11 and is electrically connected to the ground of each board. That is, the chassis conductor 11 not only functions as a strength member that holds and maintains the plasma display panel 10 and each drive circuit board, but also functions as an electrical ground for each drive circuit board. As shown in FIG. 2, for example, the signal ground of the scan / sustain electrode drive circuit board 12a is point A, the signal ground of the address electrode drive circuit board 12b is point B, and the signal ground of the relay circuit board 12c is C. At this point, the signal ground of the discharge control circuit board 12d is a point D and is grounded to the chassis conductor 11 which is a frame ground.

  As shown in FIG. 4, the conductive front filter 20 includes a base layer 201 made of a polyester film or the like, a conductive layer 202 formed by sputtering or a metal mesh such as copper on the base layer 201, and a peripheral portion of the conductive layer 202. And a protective film 204 formed on the conductive layer 202 with a transparent insulating resin. Since the metal end portion 203 is not covered with the protective film 204, it functions as an electrical connection location.

  As the conductive layer 202, a copper mesh is used as a metal mesh, and a silver sputter is used as a sputter. In addition, since the resistivity of a metal mesh is low, a high shielding effect is acquired.

  The casing 17 is electrically connected to the metal edge 203 of the conductive front filter 20 affixed to the plasma display panel 10 through the conductive gasket 21 that is a conductive contact member at the inner edge of the front side. It is in a state of touching. Further, the housing 17 is in electrical contact with the back cover 16 at the inner edge on the back side.

  The conductive gasket 21 is a member having elasticity and conductivity by attaching metal fibers to the surface of an elastic material such as sponge. In the example of the first embodiment, the conductive gasket is used as the conductive contact member. However, the present invention is not limited to this. What is necessary is just to have electroconductivity and to ensure the stability of the electrical contact between two members. For example, a conductive spring portion may be formed on the housing 17 and used as a conductive contact member. In this way, it is possible to save the trouble of disposing a conductive gasket as a separate member in the assembling work, and it is possible to reduce the cost.

  The back cover 16 is formed, for example, by press molding a conductive metal plate. It is fixed to the housing 17 so as to cover the back surface of the plasma display panel 10 and each driving circuit board, and plays a role of shielding electromagnetic waves radiated from the plasma display panel 10 and each driving circuit board. The back cover 16, together with the conductive front filter 20, the conductive gasket 21, and the casing 17, constitutes a shield structure (shield casing) that shields unwanted electromagnetic radiation.

  Next, the holding structure (fixed structure) of the back cover 16 by the housing 17 and the electrical connection structure between the housing 17 and the back cover 16 will be described in detail with reference to the schematic diagram of FIG.

  As shown in FIG. 5, a leaf spring 16 a is formed on the edge of the substantially square back cover 16 so as to be substantially continuous along the edge. The leaf spring 16a is formed, for example, by bending an edge portion of the back cover 16 along the edge portion. In the example of the first embodiment, the leaf spring 16a is a leaf spring top portion 16b in the x direction. Has a substantially V-shaped bent shape. The plate spring 16a is formed so that the plate spring top portion 16b protrudes in the x direction from the surface of the back cover 16 on the plasma display panel 10 side. In the example of the first embodiment, the leaf spring 16 a is formed over substantially the entire circumference of the back cover 16.

  A first positioning wall 17a for positioning the holding position (fixed position) of the back cover 16 in the x direction (first direction: thickness direction of the plasma display panel) is provided at the rear edge of the housing 17. , A second positioning wall 17b for positioning the holding position (fixed position) of the back cover 16 in the y direction (second direction). Specifically, as shown in FIG. 5, an edge on the back side of the housing 17 is provided as a second positioning wall 17 b provided along the x direction, and an edge on the back side of the housing 17 is provided. A wall provided along the y direction so as to protrude inward from the inner surface is provided as a first positioning wall 17a. That is, in the example shown in FIG. 5, the first positioning wall 17a and the second positioning wall 17b are provided at the edge on the back side of the housing 17 so as to be orthogonal to each other. The first positioning wall 17a and the second positioning wall 17b are formed over substantially the entire circumference in the frame-shaped housing 17.

  As shown in FIG. 5, the first positioning wall 17a and the second positioning wall 17b in the casing 17 and the leaf spring 16a of the back cover 16 are in contact with each other and the contact state is maintained. ing. Specifically, the width dimension in the y direction of the back cover 16 is formed to be slightly larger than the distance (distance in the y direction) between the second positioning walls 17b of the housing 17 facing each other. Yes. Since the back cover 16 is formed in this manner, the back cover 16 is sandwiched between the second positioning walls 17b facing each other with the leaf spring 16a elastically compressed in the y direction. Is retained. In this holding state, the end 16c of the leaf spring 16a is kept in electrical contact with the second positioning wall 17b. In addition, the leaf spring top portion 16b is protruded and deformed in the x direction by the elastic compression deformation of the leaf spring 16, and presses the first positioning wall 17a to be in electrical contact with the first positioning wall 17a. It is kept.

  That is, the leaf spring 16a is formed on the edge of the back cover 16, and the first positioning wall 17a and the second positioning wall 17b are formed on the edge on the back side of the housing 17, whereby the leaf spring 16a. The first positioning wall 17a is pressed in the x direction and the second positioning wall 17b is pressed in the y direction by the elastic force of the leaf spring 16a, and the leaf spring top portion 16b and the end are pressed. The state of being in electrical contact with the housing 17 can be maintained at two locations (that is, two contact locations 18) of the portion 16c. Moreover, each contact location 18 can be made into a linear (band-like) contact state. The back cover 16 is in the x-direction and y-direction by the first positioning wall 17a and the second positioning wall 17b in such a state that such electrical contact with the housing 17 is maintained. The holding position is positioned.

  Therefore, the contact area in electrical contact between the back cover 16 and the housing 17 can be increased, and the contact resistance can be reduced. At the same time, the back cover 16 and the housing 17 can be brought into electrical contact at two locations of the first positioning wall 17a and the second positioning wall 17b, and the respective contact locations 18 are linear (band-like). It can be. Therefore, it is possible to realize a shield structure in which variation in contact resistance as an electrical contact is small and stable conduction can be ensured. In addition, such a connection structure (holding structure) can be realized at a lower cost than connecting separate parts to the connection portion, and the leaf spring 16a is also formed continuously along the edge portion. Is also relatively easy.

  The leaf spring 16a preferably has a simpler structure as shown in FIG. 5, but generates elastic force in two directions by elastic compression and can be contacted at two locations as described above. Various other forms can be adopted as long as the form of the leaf spring.

  Further, the magnitude of the pressing force (elastic force) generated by the elastic compression deformation of the leaf spring 16a should be set in consideration of the holding strength of the back cover 16, the stability of electrical conduction, and the workability during assembly. Is preferred.

  In the above description, the case where the leaf spring 16a is provided all around the edge of the back cover 16 has been described. However, if a leaf spring is provided on at least one side of the edge of the rectangular back cover 16. It is more preferable that they are provided on a pair of sides facing each other. In addition, although it is preferable that the leaf spring is provided continuously on the edge side, the leaf spring is partially provided in a place where it is difficult to provide the leaf spring due to the structure of the housing 17. There may be no such cases. That is, it is only necessary that the leaf spring is provided substantially continuously on the edge side. Note that it is difficult to structurally provide a leaf spring at the corner of the quadrangular back cover 16, and a relief or a rounded portion (curved portion) may be provided at the corner.

  Further, in the above description, the case where the first positioning wall 17a is formed along the y direction and the second positioning wall 17b is formed along the x direction has been described. However, the respective positioning walls 17a and 17b are described. However, as long as the positioning function and the holding function of the back cover 16 can be achieved, the forming direction and shape of each positioning wall can be in various other forms.

  Further, instead of the case where the plate spring 16 a is formed on the back cover 16, a plate spring can be formed on the housing 17.

(Second Embodiment)
Next, a connection structure between the housing and the back cover in the plasma display apparatus according to the second embodiment of the present invention will be described with reference to FIG. 6A.

  As shown in FIG. 6A, the connection structure of the second embodiment is the same as that of the first embodiment in that the positioning wall is formed with a recess that engages with the leaf spring at a contact location with the leaf spring. Different from the connection structure.

  Specifically, as shown in FIG. 6A, the housing 117 includes a first positioning wall 117a and a second positioning wall 117b, and an end portion 16c of the leaf spring 16a on the second positioning wall 117b; A recess 131 is formed at the contact portion 18. In the recess 131, the end 16c of the leaf spring 16a is inserted and engaged, and the end 16c of the leaf spring 16a is fixed so that the position of the contact portion 18 does not move. The recess 131 is formed so as to be substantially continuous along the edge of the housing 117.

  By adopting the configuration of the second embodiment as described above, the end 16c of the leaf spring 16a and the recess 131 are engaged with each other, and the contact position 18 of both is fixed. As described above, the leaf spring 16a can be elastically compressed and deformed in the x direction and the y direction. Therefore, it is possible to increase the accuracy of the position of attaching the back cover 16 to the casing 117 and to set the x relative to the first positioning wall 117a with the contact position 18 between the end 16c of the leaf spring 16a and the recess 131 as a fulcrum. The pressing force in the direction can be applied to improve the contact property, and the pressing force in the y direction can be applied to the second positioning wall 117b to improve the contact property. The contact property with the housing 117 can be improved. In addition, it is easy to avoid warping of the back cover during assembly, and the back cover 16 can be securely fixed to the casing 117 without using another fixing member, so that assembly workability is improved. can do.

  In addition, the formation position of the recessed part 131 provided in the contact location 18 with the leaf | plate spring 16a is not restricted only on the 2nd positioning wall 117b, as shown to FIG. 6A. Instead of such a case, for example, as in the modification shown in FIG. 6B, in the housing 217 including the first positioning wall 217a and the second positioning wall 217b, the first positioning wall 217a and the leaf spring 16a The case where the recessed part 231 is formed in the contact location 18 with the leaf | plate spring top part 16b may be sufficient. In such a case, the leaf spring top 16b and the recess 231 are engaged, so that the position of the contact point 18 between them is fixed, and the elastic force of the leaf spring 16a is effectively utilized, The contact between the back cover 16 and the housing 217 can be improved. However, from the viewpoint of effectively increasing the pressing force in the two directions of the x direction and the y direction, the recess 131 is preferably formed in the second positioning wall 117b.

  In the above description, one recess is provided, but the recess may be formed on both the first positioning wall and the second positioning wall. Moreover, there is no restriction | limiting in particular in the cross-sectional shape of a recessed part, For example, circular arc shape may be sufficient and asymmetrical shape may be sufficient.

(Third embodiment)
Next, a connection structure between the housing and the back cover in the plasma display apparatus according to the third embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 7, the connection structure of the third embodiment is different from the connection structure of the first embodiment in that the leaf spring 16a is fixed to the housing 17 by a fixing member. . Specifically, in the leaf spring top portion 16b of the back cover 16, a structure that is fixed to the first positioning wall 17a by a screw 32 that is an example of a fixing member at the contact location 18 is used. The fixing member may be any member that has a function of fixing the back cover 16 to the housing 17, and other screws may be employed.

  According to the connection structure of the third embodiment, since the leaf spring top portion 16b is fixed with the screw 32, the back cover 16 and the housing are formed by the pressing force due to the elastic compression deformation of the leaf spring 16a and the tightening force of the screw 32. Conductive contact with the body 17 can be strengthened.

(Fourth embodiment)
Next, a connection structure between a housing and a back cover in the plasma display apparatus according to the fourth embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 8, the connection structure of the fourth embodiment is common to the connection structure of the third embodiment in that the leaf spring is fixed to the housing using screws. The structure of the housing is different from that of the third embodiment.

  Specifically, as shown in FIG. 8, the housing 317 includes a first positioning wall 317a and a second positioning wall 317b, and the back cover 16 is provided at the end of the first positioning wall 317a. A screw receiving portion 317c is formed so as to protrude toward the end. The leaf spring 16a of the back cover 16 is in pressure contact with the first positioning wall 317a at the leaf spring top portion 16b, and is in pressure contact with the second positioning wall 317b at the end portion 16c of the leaf spring 16a. Further, in the back cover 16, a screw receiving portion is provided via a screw 32, which is an example of a fixing member, at a position on the root side of the leaf spring 16 a, that is, a position on the inner side of the back cover 16 with respect to the leaf spring top portion 16 b. It is fixed to 317c.

  By adopting such a configuration, by tightening the screw 32, the screw receiving portion 317c which is a fixed position by the screw 32 serves as a fulcrum, and the elastic force generated by the elastic compression deformation of the leaf spring 16a of the back cover 16 is generated. The pressing force can be effectively applied to the first positioning wall 317a and the second positioning wall 317b. Therefore, the conductive contact between the back cover 16 and the housing 317 can be strengthened by the elastic force of the leaf spring 16a and the tightening force of the screw 32. Further, since the conductive connection with the back cover 16 can be secured also in the screw receiving portion 317c, the contact area can be further increased.

  The specific numerical values and the like used in each of the above embodiments are merely examples, and can be appropriately set to optimum values according to the characteristics and specifications of the display device.

  In each of the above-described embodiments, the frame-shaped casing 17 has been described as an example of a structure in which the front cabinet 19 and the side wall (a structural portion other than the front cabinet 19 of the casing 17) are integrated. However, it is not necessarily limited to such a structure. Instead of such a case, for example, the front cabinet and the side wall may be separate parts. In addition, the conductive front filter 20 has been described as an example of a structure attached to the plasma display panel 10, but a conductive film may be attached to a front glass disposed on the display side of the plasma display panel 10.

  In each of the above embodiments, the case where the display device is a plasma display device has been described. However, as the display device, the present invention can also be applied to a liquid crystal display device, an organic EL display device, and the like.

  Each of the above-described embodiments is an example of the present invention. The present invention is not limited to the above-described embodiments, and various modifications are possible, and these are also included in the scope of the present invention. In addition, by appropriately combining arbitrary embodiments of the various embodiments described above, it is possible to achieve the respective effects.

  The display device according to the present invention is useful as a display device or the like that can effectively reduce electromagnetic interference waves (unwanted electromagnetic wave radiation) generated by current flowing through the display panel.

DESCRIPTION OF SYMBOLS 1 Plasma display apparatus 2 Plasma display module 10 Plasma display panel 11 Chassis conductor 12a Scan / sustain electrode drive circuit board 12b Address electrode drive circuit board 12c Relay circuit board 12d Discharge control circuit boards 13a, 13b, 13c, 13d Flexible cable 14 Scan / sustain electrode 15 Address electrode 16 Back cover 16a Leaf spring 16b Leaf spring top portion 16c End 17 Housing 17a First positioning wall 17b Second positioning wall 18 Contact point 19 Front cabinet 20 Conductive front filter 21 Conductive gasket 32 Screw 101 Front glass plate 102 Rear glass plate 103 Dielectric layer 104 Discharge cell 105 Partition walls 106a, 106b, 106c Phosphor 131, 231 Recess 201 Base layer 202 Conductive layer 203 Metal Edge 204 Protective film

Claims (6)

A display panel;
A conductive filter disposed on the front side of the display panel;
A conductive back cover disposed on the back side of the display panel;
A conductive frame disposed around the display panel to hold the back cover and electrically connected to the filter and the back cover;
The frame includes a first positioning wall that positions the holding position of the back cover in a first direction that is the thickness direction of the display panel, and a holding position of the back cover in a second direction that is orthogonal to the first direction. A second positioning wall for positioning,
A leaf spring is formed substantially continuously along the edge on at least one edge of the quadrangular back cover, and the leaf spring is elastically compressed in the second direction. A display device in which the contact state between the wall and the second positioning wall and the leaf spring is maintained.   The leaf spring has a bent shape having a leaf spring top on the front side of the display panel, and the leaf spring is elastically compressed in the second direction, so that the leaf spring top is pressed against the first positioning wall and comes into contact. The display device according to claim 1.   The second positioning wall is formed with a recess that is engaged with the end of the edge of the leaf spring, and the leaf spring is supported by the engagement position between the edge of the edge of the leaf spring and the recess. The display device according to claim 2, wherein the display device is elastically compressed in the first direction and the second direction.   The back cover and the first positioning wall are fixed by a fixing member in a region inside the plate spring top of the plate spring in the back cover, and the plate spring is moved in the first direction with the fixing position by the fixing member as a fulcrum. The display device according to claim 2, wherein the display device is elastically compressed in the second direction.   5. The frame according to claim 1, wherein the first positioning wall is a wall provided along the second direction, and the second positioning wall is a wall provided along the first direction. 6. The display apparatus as described in any one.   The display device according to claim 1, wherein a leaf spring is formed substantially continuously at at least one pair of edge portions facing each other in the back cover.

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