JP2010181808A - Display apparatus and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress migration of static electricity to a wiring board. <P>SOLUTION: A supporting body 36 supports a display body 32 and a wiring board 34. On the substrate 40 of the wiring board 34, a plurality of lines 42 including a grounding conductor 42A, an electronic circuit 44 used for controlling the display body 32, and metal fastening patterns 46 formed around a through hole H1 at the four corners of the substrate 40 are arranged. The wiring board 34 is fixed to the supporting body 36 with a screw 61 inserted in the through hole H1. The fastening pattern 46 is formed at a position and in a shape separated from the grounding conductor 42A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure in which a display body for displaying an image and a wiring board for controlling the display body are installed.

  Conventionally, a display device in which a display body and a wiring board are accommodated in a housing has been proposed. For example, Patent Document 1 discloses a configuration in which a wiring board disposed on the back side of a display body is fixed to a housing with screws (screws). The screw for fixing the wiring board is electrically connected to the wiring (ground line) of the wiring board.

JP 2007-328922 A

  However, in the technique of Patent Document 1, static electricity generated in the housing may reach the wiring of the wiring board via a screw and cause a malfunction (malfunction or electrostatic breakdown) of the electronic circuit mounted on the wiring board. There is. In view of the above circumstances, an object of the present invention is to suppress the movement of static electricity with respect to a wiring board.

  In order to solve the above problems, a display device of the present invention includes a display board for displaying an image, a wiring board on which electronic circuits and wirings used for controlling the display body are installed (for example, in FIGS. 5 and 9). Wiring board 34), a support body that supports the display body and the wiring board, and a housing that accommodates the display body, the wiring board, and the support body, and the support body and the wiring of the wiring board are electrically insulated. Is done. In the above configuration, since the support and the wiring of the wiring board are electrically insulated, the movement of static electricity from the housing or the support to the wiring of the wiring board is suppressed. Therefore, there is an advantage that it is possible to prevent problems (for example, malfunction or electrostatic breakdown) of the electronic circuit of the wiring board. The display device according to the present invention is used in various electronic devices (for example, personal computers and mobile phones).

  In the first aspect of the present invention, the wiring board includes a metal fastening pattern formed around the through hole of the wiring board, and is supported by a fixture (for example, a screw, screw, or bolt) inserted into the through hole. The fastening pattern and the wiring are formed apart from each other, fixed to the body. In the above aspect, since the fastening pattern and the wiring of the wiring board are formed apart from each other, it is possible to easily insulate the support and the wiring of the wiring board. A specific example of the first aspect will be described later as the first embodiment.

  In the second aspect of the present invention, the wiring board includes a metal fastening pattern formed around the through hole of the wiring board, and is inserted into the through hole via an insulating washer disposed on the fastening pattern. It fixes to a support body with the fixed fixture. In the above aspect, since the washer is disposed on the fastening pattern, it is possible to reliably insulate the support and the wiring of the wiring board. In the second aspect, a configuration in which a fastening pattern and a wiring (for example, a ground line) are continuous is preferable. In the above configuration, since the area of the wiring is ensured larger than the configuration in which the fastening pattern and the wiring are separated from each other, the potential of the wiring can be stabilized. A specific example of the second aspect will be described later as a second embodiment.

  In a preferred aspect of the present invention, the electronic device includes a second wiring board on which an electronic circuit and wiring used for controlling the display body are installed, and a ground frame on which the housing and the second wiring board are fixed. The two-wiring board includes a second metal fastening pattern formed around the through hole of the second wiring board, and is fixed to the ground frame with a fixture inserted into the through-hole. The wiring of the wiring board is formed away from each other. In the above aspect, since the ground frame and the wiring of the second wiring substrate are electrically insulated, the movement of static electricity from the ground frame to the wiring of the second substrate is suppressed. Therefore, there is an advantage that it is possible to prevent malfunction (for example, malfunction or electrostatic breakdown) of the electronic circuit of the second wiring board.

  In another aspect, the electronic device includes a second wiring board on which an electronic circuit and wiring used for controlling the display body are installed, and a ground frame on which the housing and the second wiring board are fixed. The wiring board includes a metal second fastening pattern formed around the through-hole of the second wiring board, and is fixed to the through-hole through an insulating washer arranged on the second fastening pattern. Fixed to the ground frame with tools. Also in the above aspect, since the ground frame and the wiring of the second wiring substrate are electrically insulated, there is an advantage that the movement of static electricity from the ground frame to the wiring of the second substrate is suppressed.

1 is a perspective view of a display device according to a first embodiment. It is sectional drawing of the II-II line in FIG. It is sectional drawing of the III-III line in FIG. It is a disassembled perspective view of a display module. It is a top view of a wiring board. It is sectional drawing of the VI-VI line in FIG. It is a top view of a wiring board. It is sectional drawing of the VIII-VIII line in FIG. It is a top view of the wiring board in a 2nd embodiment. It is sectional drawing of the XX line in FIG. It is a top view of a wiring board. It is sectional drawing of the XII-XII line | wire in FIG. It is sectional drawing of the display apparatus which concerns on a modification. It is a perspective view of an electronic device (personal computer). It is a perspective view of an electronic device (cellular phone). It is a perspective view of an electronic device (personal digital assistant).

<A: First Embodiment>
FIG. 1 is a perspective view of a display device according to the first embodiment. As shown in FIG. 1, the display device 100 includes a display unit 10 and a wiring board 20. The display unit 10 and the wiring board 20 are fixed to the ground frame 200. The ground frame 200 is a grounded conductor. For example, when the display device 100 is used as an in-vehicle display device (instrument panel) that is installed in a vehicle such as an automobile and displays information related to the vehicle (the speed of the vehicle and the rotational speed of the engine), the vehicle body of the vehicle Is used as the ground frame 200. The display unit 10 is fixed to the surface of the ground frame 200, and the wiring board 20 is fixed to the surface of the ground frame 200 opposite to the display unit 10.

  2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. As shown in FIGS. 2 and 3, the display unit 10 includes a display module 12 and a housing 14. The display module 12 is accommodated in the housing 14.

  FIG. 4 is an exploded perspective view of the display unit 10. As shown in FIGS. 2 to 4, the display module 12 includes a display body 32, a wiring board 34, and a support body 36. The display body 32 includes a plurality of pixels PX arranged in a planar shape (matrix) in the display area A and a drive circuit that drives each pixel PX so that an image corresponding to the image data is displayed in the display area A. (Not shown). The display body 32 of the present embodiment is an organic EL display device using an organic EL (Electroluminescence) element as the pixel PX.

  FIG. 5 is a plan view of the wiring board 34 (a plan view of the surface opposite to the support 36). The wiring board 34 is a rigid board (single layer board or multilayer board) including a base material 40 formed into a rectangular plate shape. As shown in FIG. 5, a plurality of wirings 42 are formed on the surface of the base material 40 and an electronic circuit 44 is mounted. The electronic circuit 44 and the plurality of wirings 42 are used for controlling the display body 32. That is, the electronic circuit 44 is, for example, a timing generation circuit that generates various control signals such as synchronization signals and outputs the control signals to the display body 32 (drive circuit), or a power supply circuit that supplies power to the display body 32. The plurality of wirings 42 include a ground line 42A that is maintained at a ground potential. Further, as shown in FIG. 4, through holes H 1 are formed at the four corners of the base material 40.

  The support body 36 in FIG. 4 supports the display body 32 and the wiring board 34. As shown in FIGS. 3 and 4, the support 36 is a metal member having a shape in which the side surface portion 364 is connected to the opposite sides of the rectangular flat plate portion 362. The display body 32 is fixed (for example, bonded) to the surface of the flat plate portion 362. As shown in FIGS. 2 to 4, the wiring substrate 34 is fixed to the surface of the flat plate portion 362 opposite to the display body 32 by a plurality of screws 61 inserted into the through holes H 1 of the base material 40. The

  As shown in FIG. 2, the display body 32 and the wiring board 34 are electrically connected via a flexible wiring board 38 (not shown in FIGS. 3 and 4) fixed to both. The wiring board 34 is electrically connected to the wiring board 20 via a flexible wiring board (not shown).

  As shown in FIGS. 2 to 4, the housing 14 includes a frame body portion 142 and a back surface portion 144. The frame body part 142 is a metallic member formed in a rectangular frame shape surrounding the display module 12. An opening 146 corresponding to the display area A is formed in the frame body 142. The display module 12 is fixed to the inside of the frame body portion 142 in a state where the side surface portion 364 of the support body 36 is in contact with the inner peripheral surface of the frame body portion 142.

  The back surface portion 144 is a metallic plate material (back cover) that closes the back surface side of the frame body portion 142. As shown in FIGS. 2 to 4, the back surface portion 144 is fixed to the frame body portion 142 with a plurality of screws 62 inserted into the through holes H2 at the four corners. Then, the display module 12 is fixed to the ground frame 200 with a plurality of screws 63 inserted into the through holes H 3 at the four corners of the back surface portion 144.

  6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIGS. 5 and 6, a fastening pattern 46 is formed around each through hole H 1 on the surface of the base material 40 of the wiring board 34. The fastening pattern 46 is an annular (annular) conductor along the inner periphery of the through hole H1, and collectively removes the conductive film formed on the surface of the substrate 40 together with each wiring 42. Formed (that is, formed from the same layer as the wiring 42). The ground line 42A is formed in a solid pattern over a wide range so as to avoid each fastening pattern 46.

  As shown in FIG. 6, each fastening pattern 46 is an island-like pattern formed in a position and shape away from the wiring 42 (grounding wire 42 </ b> A) on the base material 40. Therefore, the fastening pattern 46 and the ground wire 42A are electrically insulated. As shown in FIG. 6, the surface of the substrate 40 is covered with a resist layer 48. A portion of the resist layer 48 that overlaps each fastening pattern 46 is selectively removed (that is, the fastening pattern 46 is exposed from the resist layer 48). Since the fastening pattern 46 and the ground line 42A are formed apart from each other, a resist layer 48 is interposed therebetween.

  As shown in FIG. 6, a cylindrical spacer (washer) 662 is disposed in the gap between the wiring board 34 and the support 36. Since the screw 61 passes through the through hole H1 and the spacer 662 and is fixed to the support body 36, the wiring board 34 is fixed to the support body 36 with an interval corresponding to the dimension of the spacer 662. When the wiring board 34 is fixed, the lower surface of the head 61A of the screw 61 presses the fastening pattern 46, so that the head 61A and the fastening pattern 46 are firmly pressed. Therefore, it is possible to securely fix the wiring board 34 to the support body 36 as compared with a configuration in which the fastening pattern 46 is not formed on the base material 40.

  As shown in FIGS. 5 and 6, the outer diameter of the fastening pattern 46 exceeds the diameter of the head 61 </ b> A of the screw 61. That is, the outer shape of the head 61 </ b> A of the screw 61 is located inside the outer peripheral edge of the fastening pattern 46 when viewed from the direction perpendicular to the surface of the base material 40. Since the fastening pattern 46 is formed away from the ground wire 42A, the screw 61 and the ground wire 42A are electrically insulated.

  In the configuration in which the fastening pattern 46 and the grounding wire 42A are connected, static electricity generated in the housing 14 passes through the support 36, the screw 61, and the fastening pattern 46, and the wiring 42 (grounding wire 42A) on the wiring board 34 and the electronic circuit. Since the circuit 44 is reached, a malfunction (malfunction or electrostatic breakdown) of the electronic circuit 44 may occur. On the other hand, according to the configuration in which the fastening pattern 46 and the ground wire 42A are separated as in the present embodiment, the fastening pattern 46 and the screw 61 are electrically insulated from the wiring 42 of the wiring board 34. The generated static electricity does not reach the wiring 42 even when it moves to the fastening pattern 46 via the support 36 and the screw 61. That is, most of the static electricity generated in the housing 14 is discharged from the back surface portion 144 to the ground frame 200 via the screw 63. Therefore, there is an advantage that a malfunction (for example, malfunction) of the display device 100 due to static electricity is prevented.

  Next, FIG. 7 is a plan view of the wiring board 20 (a plan view of the surface opposite to the ground frame 200). As shown in FIG. 7, the wiring board 20 has a structure in which an electronic circuit 54 for controlling the display body 32 and a plurality of wirings 52 are installed on the surface of the base material 50 (that is, a structure similar to the wiring board 34). . The electronic circuit 54 is, for example, a clock generator that generates a basic clock signal or an image processing circuit that generates image data. The plurality of wirings 52 include a ground line 52A that is maintained at a ground potential.

  As shown in FIGS. 2 and 3, the wiring board 20 is fixed to the ground frame 200 with a plurality of screws 64. As exemplified below, the wiring board 20 is fixed using the same structure as the fixing of the wiring board 34 to the support 36.

  8 is a cross-sectional view taken along line VIII-VIII in FIG. As shown in FIG. 8, at the four corners of the substrate 50, through holes H4 into which screws 64 are inserted are formed. As shown in FIGS. 7 and 8, an annular fastening pattern 56 surrounding the through hole H4 is formed on the surface of the substrate 50 from the same layer as the wiring 52 (grounding line 52A). The fastening pattern 56 is formed at a position away from the ground line 52A and is exposed from the resist layer 58 on the surface of the substrate 50. A spacer 664 is disposed between the wiring board 20 and the ground frame 200. The wiring board 20 is fixed to the ground frame 200 with screws 64 that pass through the through hole H 4 and the spacer 664. The head 64 </ b> A of the screw 64 is pressed against the fastening pattern 56.

  Since the outer shape of the fastening pattern 56 exceeds the diameter of the head portion 64A of the screw 64, the screw 64 and the ground wire 52A are electrically insulated. According to the above configuration, even when static electricity generated in the ground frame 200 moves to the screw 64 or the fastening pattern 56, it does not reach the wiring 52. Therefore, there is an advantage that the malfunction of the electronic circuit 54 due to static electricity is prevented.

<B: Second Embodiment>
Next, a second embodiment of the present invention will be described. In addition, about the element in which an effect | action and a function are equivalent to 1st Embodiment in each following form, the same code | symbol as the above is attached | subjected and each detailed description is abbreviate | omitted suitably.

  FIG. 9 is a plan view of the wiring board 34 in the second embodiment, and FIG. 10 is a cross-sectional view taken along line XX in FIG. As shown in FIGS. 9 and 10, the fastening pattern 46 around the through hole H1 is continuous with the ground line 42A. In other words, the portion around the through hole H1 in the ground wire 42A is used as the fastening pattern 46. As in the first embodiment, the fastening pattern 46 is exposed from the resist layer 48.

  As shown in FIGS. 9 and 10, an insulating washer 682 is disposed on the surface of the fastening pattern 46. The wiring board 34 is fixed to the support 36 with insulating screws 61. As shown in FIG. 10, the screw 61 passes through the washer 682, the through hole H 1, and the spacer 662 and is fixed to the support 36. In a state where the wiring board 34 is fixed, the washer 682 is interposed between the head 61A of the screw 61 and the fastening pattern 46 and is pressed against the fastening pattern 46.

  Since the washer 682 and the screw 61 are formed of an insulating material, the support 36 and the fastening pattern 46 (the ground line 42A) are electrically insulated. Therefore, as in the first embodiment, the static electricity that has moved from the housing 14 to the support 36 does not reach the wiring 42 (the ground wire 42A) or the electronic circuit 44. According to the above configuration, it is possible to prevent a malfunction (for example, malfunction) of the display device 100 due to static electricity. Further, compared to the configuration in which the fastening pattern 46 and the ground line 42A are separated as in the first embodiment, the fastening pattern 46 is continuous, so that a large area of the ground line 42A is secured. In addition, the potential of the ground line 42A can be stabilized.

  As shown in FIGS. 11 and 12, the same structure as that of the wiring board 34 is also used for fixing the wiring board 20. That is, the fastening pattern 56 around each through hole H4 formed in the base material 50 of the wiring board 20 is continuous to the ground line 52A, and an insulating washer 684 is disposed on the surface of the fastening pattern 56. The insulating screw 64 passes through the washer 684, the through hole H4, and the spacer 664 and is fixed to the ground frame 200. Therefore, the ground frame 200 and the fastening pattern 56 (ground line 52A) are electrically insulated. In the above configuration, since static electricity generated in the ground frame 200 does not reach the ground line 52A or the electronic circuit 54 of the wiring board 20, there is an advantage that the malfunction of the electronic circuit 54 due to static electricity can be prevented.

<C: Modification>
Each of the above forms is variously modified. Specific modes of deformation for each form are exemplified below. Note that two or more aspects arbitrarily selected from the following examples are appropriately combined.

(1) Modification 1
In each of the above embodiments, a configuration in which the wiring 42 and the fastening pattern 46 are separated (first embodiment) and a configuration in which an insulating washer 682 is disposed on the surface of the fastening pattern 46 (second embodiment) are exemplified. However, the method for electrically insulating the support 36 and the wiring 42 of the wiring board 34 is appropriately changed. For example, even when the washer 682 is omitted from the second embodiment, the support 36 and the wiring 42 are electrically insulated if the insulating screw 61 is used. Further, if the screw 61 is an insulator in the first embodiment, the support 36 and the wiring 42 of the wiring board 34 are reliably insulated.

(2) Modification 2
As shown in FIG. 13, a configuration in which a fastening pattern 72 is formed on the surface of the base material 40 of the wiring board 34 opposite to the fastening pattern 46 (the surface facing the support 36) is also employed. With the screw 61 fixed, the spacer 662 is pressed against the fastening pattern 72. A similar configuration (a configuration in which fastening patterns are formed on both surfaces of the base material 50) is also adopted for the wiring board 20.

(3) Modification 3
In the first embodiment, the configuration in which the fastening pattern 46 is adjacent to the ground line 42A with an interval is illustrated. However, the fastening pattern 46 may be a wiring 42 other than the ground line 42A (for example, a signal transmission wiring or a high-order power supply). A configuration in which the line is adjacent to each other with a space is also adopted. Further, in the second embodiment, the configuration in which the fastening pattern 46 is continuous with the ground line 42A has been exemplified. A continuous configuration is also employed. Further, a configuration in which the fastening pattern 46 is omitted is also employed. That is, the structure exemplified above is included as a configuration for electrically insulating the support 36 and the wiring 42 of the wiring board 34. The same applies to the wiring board 20.

(4) Modification 4
In the second embodiment, similarly to the first embodiment, a configuration in which the fastening pattern 46 and the wiring 42 (the ground line 42A) are separated from each other is also employed. Further, if the washer 682 is disposed to ensure electrical insulation between the support 36 and the wiring 42 of the wiring board 34, the screw 61 of the second embodiment is formed of a conductor.

(5) Modification 5
A display element used for displaying an image is not limited to an organic EL element. The display element used for displaying an image is driven by distinguishing between a self-luminous type that emits light itself and a non-luminous type that changes the transmittance or reflectance of external light (for example, a liquid crystal element), or by supplying current. The distinction between the current drive type and the voltage drive type driven by application of an electric field (voltage) is unquestioned. For example, liquid crystal elements, inorganic EL elements, field electron emission elements (FE (Field-Emission) elements), surface conduction electron emission elements (SE (Surface conduction Electron emitter) elements), ballistic electron emission elements (BS (Ballistic electron Emitting elements)) ) Element), LED (Light Emitting Diode) element, electrophoretic element, electrochromic element and the like, the present invention is applied to a display device using various display elements. That is, the display element is included as an electro-optical element whose optical characteristics (gradation) change according to an electrical action (supply of current or application of voltage).

<D: Application example>
Next, an electronic device using the display device 100 according to each of the above aspects will be described. FIG. 14 is a perspective view illustrating a configuration of a mobile personal computer that employs the display device 100. The personal computer 2000 includes a display device 100 that displays various images, and a main body 2010 on which a power switch 2001 and a keyboard 2002 are installed.

  FIG. 15 is a perspective view illustrating a configuration of a mobile phone to which the display device 100 is applied. A cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and a display device 100 that displays various images. By operating the scroll button 3002, the screen displayed on the display device 100 is scrolled.

  FIG. 16 is a perspective view illustrating a configuration of a personal digital assistant (PDA) to which the display device 100 is applied. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and a display device 100 that displays various images. When the power switch 4002 is operated, various information such as an address book and a schedule book are displayed on the display device 100.

  Note that electronic devices to which the display device according to the present invention is applied include, in addition to the devices illustrated in FIGS. 14 to 16, digital still cameras, televisions, video cameras, car navigation devices, pagers, electronic notebooks, electronic papers, Examples include calculators, word processors, workstations, videophones, POS terminals, printers, scanners, copiers, and video players.

DESCRIPTION OF SYMBOLS 100 ... Display apparatus, 10 ... Display unit, 20 ... Wiring board, 200 ... Grounding frame, 12 ... Display module, 14 ... Housing, 32 ... Display body, A ... Display area, PX ... ... Pixel, 34 ... Wiring board, 36 ... Support, 40, 50 ... Base material, 42, 52 ... Wiring, 42A, 52A ... Ground wire, 44, 54 ... Electronic circuit, H1, H2, H3, H4... Through hole, 46, 56 ... fastening pattern, 61, 62, 63, 64 ... screw, 662, 664 ... spacer, 682, 684 ... washer.

Claims (6)

A display for displaying an image;
A wiring board on which electronic circuits and wiring used for controlling the display body are installed; and
A support for supporting the display and the wiring board;
A housing that accommodates the display body, the wiring board, and the support;
The display device, wherein the support and the wiring of the wiring board are electrically insulated. The wiring board includes a metal fastening pattern formed around the through hole of the wiring board, and is fixed to the support with a fixture inserted into the through hole,
The display device according to claim 1, wherein the fastening pattern and the wiring are formed apart from each other. The wiring board includes a metal fastening pattern formed around a through-hole of the wiring board, and the fixing board inserted into the through-hole through an insulating washer disposed on the fastening pattern. The display device according to claim 1, wherein the display device is fixed to a support. The display device according to claim 3, wherein the fastening pattern and the wiring are continuous. The display device according to claim 2, wherein the fixture is an insulator. An electronic apparatus comprising the display device according to claim 1.

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