JP4669724B2 - Display panel mounting structure - Google Patents

Description

  The present invention relates to a display panel mounting structure disposed in front of a display unit having a display, and more particularly to a display panel mounting structure having both an electromagnetic shielding function and a sealing function.

  Conventionally, as a structure having both an electromagnetic shielding function and a sealing function, for example, a conductive material such as a conductive thread or a metal powder is used in a seal packing sandwiched between a frame portion of a housing and a lid (corresponding to a display panel). The thing using the conductive rubber which mixed the raw material is disclosed (for example, refer to patent documents 1).

  This structure avoids various obstacles due to electromagnetic waves radiated from the equipment in the casing by grounding the conductive material mixed in the conductive rubber to the casing. Prevents intrusion of water and dust. Thereby, it has both an electromagnetic shielding function and a sealing function.

As a conventional display panel mounting structure having both an electromagnetic shielding function and a sealing function, for example, the following is known.
In this display panel mounting structure, the entire back surface (display side surface) of the display panel mounted on the frame of the housing is covered with a mesh-type electromagnetic shielding material, and the frame of the housing and the display panel A silicon rubber seal packing is sandwiched between them.

In this display panel mounting structure, various obstacles caused by electromagnetic waves radiated from the display in the casing are avoided by grounding the electromagnetic shielding material to the casing. In addition, entry of water, dust, or the like from the outside is prevented by using silicon rubber for the seal packing sandwiched between the frame portion of the housing and the display panel. Thereby, it can be said that it can have both an electromagnetic shielding function and a sealing function.
Japanese Patent Laid-Open No. 10-256770

When the conductive rubber is used for the seal packing sandwiched between the frame part of the casing and the lid as in the former, the contact area between the casing and the conductive material of the conductive rubber is small, and the contact resistance Is expensive. For this reason, it is difficult to ensure a sufficient electromagnetic wave shielding function.
Further, since the conductive rubber is an expensive material, the cost is high, and the seal packing made of the conductive rubber has a problem that it is inferior in durability and sealability as compared with a seal packing exclusively for sealing.

  On the other hand, in the latter case, the entire back surface of the display panel is covered with a mesh type electromagnetic shielding material, and the electromagnetic shielding material is grounded to the housing. Seal packing is used. For this reason, sufficient electromagnetic shielding function and sealing function can be ensured.

  However, the mesh-type electromagnetic shielding material is attached by pressing the periphery of the electromagnetic shielding material from the back surface of the display panel with a plate or the like and fixing the display panel together with the display panel. For this reason, although the periphery of the electromagnetic shielding material can be fixed, the electromagnetic shielding material is lifted at the center of the rear surface of the display panel, and bending and wrinkles are likely to occur.

As a result, it is necessary to carefully attach the electromagnetic shielding material to the rear surface of the display panel so that the electromagnetic shielding material does not float at the center of the rear surface of the display panel. Cost.
In addition, if there is any slight bending or wrinkle due to the lifting of the electromagnetic shielding material in the center of the rear surface of the display panel, the bending or wrinkling of the electromagnetic shielding material will be hidden when the indicator placed on the back side of the display panel is lit. There is a problem that the display on the display becomes difficult to see.

  The present invention has been made to eliminate such inconveniences, and can ensure a reliable electromagnetic shielding function and a sealing function, as well as improve workability of installation and visibility of display on the display. An object of the present invention is to provide a display panel mounting structure that can be realized.

In order to achieve the above object, the display panel mounting structure of the present invention is arranged in front of a display unit having a display unit, and is integrally formed with an electromagnetic shield material interposed between two plate members. In addition, a display panel having transparency that allows the display to be visually recognized from the outside, a housing having a frame portion to which the display panel is attached, and a seal between the frame portion and the display panel of the housing The display panel is attached to the frame portion so that the electromagnetic shielding material is electrically grounded to the housing.
In this way, the display panel is integrally molded with the electromagnetic shielding material interposed between the two plates, and the display panel is framed so that the electromagnetic shielding material is electrically grounded to the housing. A reliable electromagnetic shielding function can be ensured by attaching to. In addition, since the electromagnetic shielding material does not bend or wrinkle, the visibility of the display can be improved.
In addition, since the display panel can be attached to the frame portion of the housing without considering the bending or wrinkling of the electromagnetic shield material, the workability of attaching the display panel can be improved.
Furthermore, since the seal member for sealing between the frame portion of the housing and the display panel can be a seal member dedicated to sealing that is excellent in durability and sealability, a reliable sealing function can be ensured. .

In the display panel mounting structure of the present invention, the plate material is an acrylic plate.
Thus, by using an acrylic plate as the plate material, it is possible to reduce the weight and improve the design.

Furthermore, in the display panel mounting structure of the present invention, the seal member is a silicon rubber seal packing.
Thus, a reliable sealing function can be ensured at low cost by using a seal packing made of silicon rubber as the sealing member.

Furthermore, the mounting structure of the display panel of the present invention includes a fixing plate that fixes the display panel to the frame portion of the housing from the display side of the display panel, and includes the two plate members of the display panel. The outer peripheral edge of the plate member disposed on the side away from the display unit, the outer shape of the plate member disposed on the display unit side is made smaller than the plate member disposed on the side away from the display unit. In addition, the electromagnetic shielding material is exposed to the housing with the fixing plate attached to the housing in a state where the electromagnetic shielding material is exposed and the exposed portion is in contact with the stationary plate. And electrically grounded.
In this way, by attaching the fixed plate to the casing in a state where the fixed plate is in contact with the electromagnetic shield material exposed at the peripheral edge of the back surface of the plate member on the side separated from the display unit, the display plate is displayed. Simultaneously with fixing the panel to the frame of the casing, the electromagnetic shielding material is electrically grounded to the casing. Thereby, the mounting operation of the display panel can be facilitated.

Furthermore, in the display panel mounting structure of the present invention, a conductive member is interposed between the exposed portion of the electromagnetic shield material and the fixing plate, and the electromagnetic shield material is attached to the casing with the conductive member and It is configured to be electrically grounded through the fixed plate.
In this way, by interposing a conductive member between the exposed portion of the electromagnetic shield material and the fixed plate, the fixed plate is securely connected to the exposed portion of the electromagnetic shield material for the frame portion and the fixed plate of the housing. It is not necessary to consider the mounting accuracy and dimensional accuracy for making contact. For this reason, the design burden can be reduced, and the electromagnetic shielding material can be easily and reliably grounded to the housing.

Furthermore, in the display panel mounting structure of the present invention, the conductive member is a conductive paint.
Thus, the cost of a conductive member can be suppressed by using a conductive paint as a conductive member.

Furthermore, the display panel mounting structure of the present invention is configured such that a spacer projecting toward the display unit is provided on the fixed plate, and the periphery of the display unit of the display unit is brought into contact with the spacer.
As described above, the distance between the display panel and the display can be kept constant by bringing the periphery of the display of the display unit into contact with the spacer provided on the fixed plate. As a result, the display on the display device can be clarified and the luminance can be made uniform to improve the visibility.

Furthermore, the display panel mounting structure of the present invention includes a screw insertion hole penetrating from the tip of the spacer to the fixing plate, and a screw inserted from the display unit side is inserted into the screw insertion hole. The fixing plate and the display unit are integrally attached to the casing by fastening the screw shaft to the casing.
As described above, the display unit is attached to the housing by tightening the screw shaft of the screw inserted through the spacer and the screw insertion hole in the fixing plate from the display unit side, and attaching the fixing plate and the display unit integrally to the housing. No parts or processing to fix to the As a result, the structure can be simplified and the mounting operation of the display unit can be facilitated.

  According to the display panel mounting structure of the present invention, a reliable electromagnetic shielding function and sealing function can be secured at low cost, and the display panel mounting workability and the display visibility can be improved. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a cross-sectional view of a main part for explaining a display panel mounting structure according to a first embodiment of the present invention, FIG. 2 is an exploded view of the display panel mounting structure of FIG. 1, and FIG. 3 shows an electromagnetic shielding function. It is principal part sectional drawing for demonstrating.

  As shown in FIGS. 1 and 2, the display panel mounting structure according to the first embodiment of the present invention includes a display panel 1, a housing 3 having a frame 2 to which the display panel 1 is mounted, A silicon rubber seal packing (seal member) 4 for sealing between the frame 2 of the housing 3 and the display panel 1 and a fixing plate 5 for fixing the display panel 1 to the frame 2 of the housing 3 are provided. ing.

(Display panel)
The display panel 1 is integrally formed by applying heat from both sides and vacuum forming in a state where the electromagnetic shielding material 8 is interposed between two acrylic plates (plate materials) 6 and 7. The display panel 1 is disposed in front of the display 10 of the display unit 9 accommodated in the housing 3 and has transparency that allows the display 10 to be visually recognized from the outside.

  Of the two acrylic plates 6 and 7 of the display panel 1, the acrylic plate 7 disposed on the display 10 side (hereinafter referred to as the back surface acrylic plate 7) is an acrylic disposed on the side away from the display 10. The outer shape is smaller than that of the plate 6 (hereinafter referred to as the surface acrylic plate 6). Therefore, the electromagnetic shielding material 8 is exposed at the rear surface side periphery of the front surface acrylic plate 6.

  Examples of the electromagnetic shielding material 8 include a mesh type electromagnetic shielding material and an electromagnetic shielding material formed by heating and pressurizing an impregnating base material coated with a conductivity-imparting agent (for example, see JP-A-5-102694). ) Etc. can be used. The electromagnetic shielding material 8 is not particularly limited as long as a reliable electromagnetic shielding function can be ensured and the display 10 can be made to be a display panel 1 with transparency that can be visually recognized from the outside.

(Casing)
The housing 3 is made of a conductive material such as metal. The housing 3 is provided with an opening in which the display panel 1 is disposed in front of the display 10 of the display unit 9 accommodated therein, and an inner peripheral portion of the opening serves as a frame 2. Yes.
On the inner surface of the frame portion 2 facing the display 10 side, a step portion 11 cut out toward the outer surface side is formed. The outer peripheral portion of the surface acrylic plate 6 of the display panel 1 is fitted into the step portion 11.

  The step portion 11 has an inner peripheral surface 12 that faces the outer peripheral surface of the front surface acrylic plate 6 of the display panel 1 and a bottom surface 13 that faces the front surface side periphery of the front surface acrylic plate 6. A seal packing 4 made of silicon rubber is interposed between the front surface side edge of the front acrylic plate 6 and the bottom surface 13 of the step portion 11. Further, a plurality of screw holes 15 are formed in the circumferential direction on the inner surface of the frame portion 2 facing the indicator 10 side at the upper position of the step portion 11 and into which the mounting screws 14 of the fixing plate 5 are screwed.

  In the state where the outer peripheral portion of the front surface acrylic plate 6 of the display panel 1 is fitted in the stepped portion 11, the electromagnetic shielding material 8 exposed on the rear surface side periphery of the front surface acrylic plate 6 is the display 10 side of the frame portion 2. Is slightly protruded from the inner surface facing toward the display 10 side. Thereby, the crushing allowance of the seal packing 4 is ensured.

(Fixed plate)
The fixed plate 5 is made of a conductive material such as metal, for example. In addition, a screw insertion hole 16 of a mounting screw 14 that is screwed into a screw hole 15 formed in the frame portion 2 of the housing 3 is formed in the fixing plate 5 corresponding to the screw hole 15.

  Then, the fixing plate 5 is attached to the frame portion 2 by screwing the screw shaft of the mounting screw 14 inserted into the screw insertion hole 16 of the fixing plate 5 into the screw hole 15 of the frame portion 2 of the housing 3 and tightening. It is done.

  At this time, the side surface of the fixed plate 5 that is separated from the display 10 on the inner peripheral side is in contact with the electromagnetic shielding material 8 that is exposed on the rear surface side peripheral edge of the front surface acrylic plate 6 of the display panel 1. The plate 6 is pressed. Thereby, the electromagnetic shielding material 8 is electrically grounded to the housing 3 through the fixed plate 5, and a reliable electromagnetic shielding function is ensured. Further, the seal packing 4 is crushed between the front acrylic plate 6 and the bottom surface 13 of the step portion 11 of the frame portion 2 to ensure a reliable sealing function.

  In a state where the fixed plate 5 is attached to the frame portion 2, the inner peripheral surface of the fixed plate 5 is in contact with the outer peripheral surface of the back surface acrylic plate 7 of the display panel 1. Thereby, it is set as the structure where the dust etc. which float in the housing | casing 3 do not penetrate | invade from the fixed plate 5 and the back surface acrylic board 7 to the electromagnetic shielding material 8 side.

  In the display panel mounting structure configured as described above, as shown in FIG. 3, the electromagnetic wave radiated from the display unit 9 or the like in the housing 3 is an electromagnetic wave shield formed integrally with the display panel 1. The material 8 is electrically grounded to the housing 3 through the fixing plate 5. Thereby, the reliable electromagnetic wave shielding function in the housing | casing 3 is ensured, and the various obstructions by electromagnetic waves can be avoided.

  In addition, the seal packing 4 crushed between the surface acrylic plate 6 of the display panel 1 and the bottom surface 13 of the step portion 11 provided in the frame portion 2 of the housing 3 ensures a reliable sealing function, Intrusion of water, dust and the like from the outside can be prevented.

  As described above, in this embodiment, the display panel 1 is formed by integrally molding the display panel 1 with the electromagnetic shielding material 8 interposed between the front surface acrylic plate 6 and the back surface acrylic plate 7. 3 is attached to the frame 2 so as to be electrically grounded. Thereby, a reliable electromagnetic shielding function can be ensured, and further, the electromagnetic shielding material 8 is not bent or wrinkled, so that the visibility of the display 10 can be improved.

  In addition, since the display panel 1 can be attached to the frame portion 2 of the housing 3 without considering the bending or wrinkling of the electromagnetic shield material 8, the workability of attaching the display panel 1 can be improved.

  Furthermore, since the fixing plate 5 is attached to the housing 3 in a state where it is in contact with the electromagnetic shielding material 8 exposed at the back surface periphery of the front acrylic plate 6, the display panel 1 is fixed to the frame portion 2 of the housing 3. At the same time, the electromagnetic shielding material 8 can be electrically grounded to the housing 3. Thereby, the attachment operation | work of the display panel 1 can be made easier.

  Further, as a seal member for sealing between the frame portion 2 of the housing 3 and the display panel 1, a seal packing 4 exclusively for sealing having excellent durability and sealing properties is used, and the seal packing 4 is made of inexpensive silicon rubber. It is said. Thereby, a reliable sealing function can be ensured at low cost.

  Further, since the acrylic plates 6 and 7 are used as the plate material of the display panel 1, the weight can be reduced and the design can be improved.

  Next, a display panel mounting structure according to a second embodiment of the present invention will be described with reference to FIGS. In addition, about the part which overlaps with the said 1st Embodiment, the same code | symbol is attached | subjected to each figure and the description is abbreviate | omitted.

  As shown in FIG. 4, the mounting structure of the display panel according to the second embodiment of the present invention is the thickness direction of the display panel 1 of the step portion 11a formed on the inner surface of the frame portion 2 facing the display 10 side. Is deeper than the step portion 11 of the first embodiment. In addition, a conductive paint 20 is applied so as to straddle the electromagnetic shielding material 8 exposed on the back surface periphery of the front surface acrylic plate 6 and the outer peripheral surface of the back surface acrylic plate 7.

  Further, in a state where the outer peripheral portion of the surface acrylic plate 6 of the display panel 1 is fitted in the stepped portion 11a, the conductive paint 20 slightly protrudes from the inner surface of the frame portion 2 facing the display 10 side toward the display 10 side. Are arranged. Thereby, the crushing allowance of the seal packing 4 is ensured.

  In this embodiment, the conductive paint 20 is provided on the surface acrylic plate 6 side by the side surface on the side away from the display 10 on the inner peripheral side of the fixing plate 5 attached to the housing 3 via the attachment screw 14. Pressed against. As a result, the conductive paint 20 is crushed and the seal packing 4 is crushed between the surface acrylic plate 6 and the bottom surface 13 of the step portion 11 a of the frame portion 2.

  As a result, as shown in FIG. 5, electromagnetic waves radiated from the display unit 9 or the like in the housing 3 are electrically transmitted to the housing 3 via the electromagnetic shielding material 8, the conductive paint 20 and the fixed plate 5. Grounded and secure electromagnetic shielding function is ensured. In addition, a reliable sealing function is ensured by the seal packing 4 crushed between the surface acrylic plate 6 of the display panel 1 and the bottom surface 13 of the step portion 11a of the frame portion 2.

  Further, in a state where the fixing plate 5 is attached to the frame portion 2, the conductive paint 20 is interposed between the inner peripheral surface of the fixing plate 5 and the outer peripheral surface of the back acrylic plate 7 of the display panel 1. It is in a disguised state. Thereby, the structure is such that dust or the like floating in the housing 3 does not enter from the space between the fixed plate 5 and the back acrylic plate 7 to the electromagnetic shielding material 8 side.

Thus, in this embodiment, the conductive paint 20 is applied so as to straddle the electromagnetic shielding material 8 exposed on the back surface periphery of the front surface acrylic plate 6 of the display panel 1 and the outer peripheral surface of the back surface acrylic plate 7. Yes.
Therefore, it is not necessary to consider the mounting accuracy and dimensional accuracy of the frame portion 2 and the fixing plate 5 of the housing 3 in order to ensure that the fixing plate 5 is in contact with the exposed portion of the electromagnetic shield material 8. Further, with respect to the fixing plate 5 and the back surface acrylic plate 7, it is not necessary to consider mounting accuracy and dimensional accuracy for bringing the inner peripheral surface of the fixing plate 5 into contact with the outer peripheral surface of the back surface acrylic plate 7. Thereby, design burden can be reduced and the electromagnetic shielding material 8 can be easily and reliably grounded to the housing 3.

  Moreover, since the conductive coating material 20 with a low material cost and easy construction is used as the conductive member, the cost of the conductive member can be suppressed. Other configurations and operational effects are the same as those of the first embodiment.

  Next, with reference to FIGS. 6 and 7, a display panel mounting structure according to a third embodiment of the present invention will be described. In addition, about the part which overlaps with the said 1st Embodiment, the same code | symbol is attached | subjected to each figure and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the display panel mounting structure according to the third embodiment of the present invention has a plurality of protrusions projecting toward the display unit 9 around each screw insertion hole 16 of the fixing plate 5. The spacer 30 is integrally fixed by caulking or the like. The spacer 30 is formed with a screw insertion hole 31 penetrating from the distal end surface to the screw insertion hole 16 of the fixing plate 5 so as to be substantially concentric with the screw insertion hole 16 and substantially the same diameter. Further, a screw insertion hole 33 formed in the frame portion 2 of the housing 3 has a screw insertion hole 33 having substantially the same diameter as the screw insertion hole 31 in the mounting plate 32 arranged around the display 10 of the display unit 9. It is formed corresponding to.

  In this embodiment, first, the mounting plate 32 of the display unit 9 is brought into contact with the distal end surface of the spacer 30 so that the screw insertion hole 31 and the screw insertion hole 33 substantially coincide with each other. The screw insertion hole 33 is inserted. Next, the mounting screw 34 is inserted into the screw insertion hole 31 of the spacer 30 and the screw insertion hole 16 of the fixing plate 5, and the screw shaft of the mounting screw 34 is formed in the frame portion 2 of the housing 3. Screw in and tighten. Thereby, the fixed plate 5 and the display unit 9 are integrally attached to the housing 3.

  In this embodiment, as in the first embodiment, the fixing plate 5 is in direct contact with the exposed electromagnetic shield material 8 on the back surface periphery of the front surface acrylic plate 6 of the display panel 1. However, instead of this, as in the second embodiment, the conductive paint 20 is interposed between the fixed plate 5 and the electromagnetic shielding material 8 exposed at the back surface periphery of the front acrylic plate 6. May be.

  As described above, in this embodiment, the mounting plate 32 of the display unit 9 is brought into contact with the front end surface of the spacer 30 provided on the fixed plate 5, so that the distance between the display panel 1 and the display 10 is kept constant. be able to. Thereby, while the display of the indicator 10 becomes clear, brightness | luminance can be equalize | homogenized and visibility can be aimed at.

  Further, by tightening the screw shaft of the mounting screw 34 inserted into the spacer 30 and the screw insertion holes 31 and 16 in the fixing plate 5 from the display unit 9 side into the screw hole 15 on the housing 3 side, the fixing plate 5 and The display unit 8 is integrally attached to the housing 3. As a result, parts and processing for fixing the display unit 9 to the housing 3 are not required, the structure can be simplified, and the mounting operation of the display unit 9 can be facilitated. Other configurations and operational effects are the same as those in the first embodiment.

  The configuration of the display, display unit, plate material, electromagnetic shielding material, display panel, frame portion, housing, seal member, fixing plate, conductive member, spacer, screw insertion hole, screw, etc. of the present invention is as described above. It is not limited to what was illustrated to the form, In the range which does not deviate from the summary of this invention, it can change suitably.

  The display panel mounting structure of the present invention is not limited to a display panel mounting structure disposed in front of a display unit including a display unit such as a display lamp or LED, and includes a display unit such as an LCD, CRT, or PDP. It can also be suitably used for a display panel mounting structure disposed in front of the display unit.

It is principal part sectional drawing for demonstrating the attachment structure of the display panel which concerns on the 1st Embodiment of this invention. It is an exploded view of the mounting structure of the display panel of FIG. It is principal part sectional drawing for demonstrating an electromagnetic shielding function. It is principal part sectional drawing for demonstrating the attachment structure of the display panel which concerns on the 2nd Embodiment of this invention. It is principal part sectional drawing for demonstrating an electromagnetic shielding function. It is principal part sectional drawing for demonstrating the attachment structure of the display panel which concerns on the 3rd Embodiment of this invention. It is an exploded view of the mounting structure of the display panel of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display panel 2 Frame part 3 Housing | casing 4 Seal packing (seal member)
5 Fixed plate 6 Surface acrylic plate (plate material)
7 Back acrylic board (plate material)
8 Electromagnetic shielding material 9 Display unit 10 Display 16, 31 Screw insertion hole 20 Conductive paint (conductive member)
30 Spacer 34 Mounting screw

Claims (5)

A display that is disposed in front of a display unit having a display unit, is integrally formed with an electromagnetic shield material interposed between two plate members, and has a transparency that allows the display unit to be visually recognized from the outside. A panel,
A housing having a frame part to which the display panel is attached;
A seal member that seals between the frame portion of the housing and the display panel ;
A fixing plate for fixing the display panel to the frame portion of the housing from the display side of the display panel ;
Out of the two plate members of the display panel, the plate member arranged on the display side is made smaller than the plate member arranged on the side away from the display unit and separated from the display unit. The electromagnetic shielding material is exposed to the back surface periphery of the plate material arranged on the side to be
With the exposed portion in contact with the fixed plate, by attaching the fixed plate to the housing, the electromagnetic shielding material is electrically grounded to the housing through the fixed plate,
A conductive member made of a conductive paint is interposed between the exposed portion of the electromagnetic shield material and the fixed plate, and the electromagnetic shield material is electrically connected to the casing via the conductive member and the fixed plate. By grounding
A display panel mounting structure, wherein the display panel is mounted on the frame so that the electromagnetic shielding material is electrically grounded to the housing.   The display panel mounting structure according to claim 1, wherein the plate member is an acrylic plate.   The display panel mounting structure according to claim 1, wherein the seal member is a seal packing made of silicon rubber. A spacer that protrudes toward the display unit is provided on the fixed plate.
To the spacer, the attachment structure of the display panel as claimed in any one of claims 1 to 3, characterized in that is brought into contact with the periphery of the display of the display unit. Forming a screw insertion hole penetrating from the tip of the spacer to the fixed plate;
The fixing plate and the display unit are integrally attached to the casing by inserting a screw inserted from the display unit side into the screw insertion hole and tightening a screw shaft of the screw to the casing. 5. A display panel mounting structure according to claim 4 , wherein

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