JP2008180988A - Display device - Google Patents

Abstract

An object of the present invention is to suppress vibration of an FPC caused by driving of an LCD panel to suppress sound generation in a casing and to avoid an increase in the number of parts and assembly man-hours.
A housing 2, a first display device 5 disposed in the housing 2, and a first display device 5 are disposed in the housing 2 and one end thereof is electrically connected to the first display device 5. In addition, the FPC 5a on which a booster circuit that generates a driving voltage necessary for driving the first display device 5 is mounted, and the back side is disposed in the housing 2 so as to face the back side of the first display device 5. The second display device 9 is formed of an elastic member and holds the second display device 9 with at least a part of the display surface of the second display device 9 exposed, and on the back side of the first display device 5 The display device includes an elastic holding member 8 that is biased toward the housing 2 and is disposed in the housing 2, and at least a part of the FPC 5 a has a facing portion 5 d that faces the back side of the first display device 5. The opposing portion 5d is brought into contact with the elastic holding member 8.
[Selection] Figure 5

Description

  The present invention relates to a display device provided with a display device disposed in a housing.

  Conventionally, as a display device provided with a display device in a housing, for example, a display-side housing and a character input-side housing are openable, and an LCD (liquid crystal display) as a display device is provided in the display-side housing. ) An open / close type mobile phone provided with a panel is well known, and this mobile phone is configured to open the display side case from the character input side case and use the display side case close to the ear during a call. It is normal.

  However, the LCD panel in the display-side housing generates a driving voltage necessary for driving the LCD panel on an FPC (flexible printed circuit board) connected to the LCD panel from the driving method that requires a high driving voltage. Therefore, there is a case where a booster circuit is mounted, and minute vibrations are generated in the booster circuit, the LCD panel itself, and the like, and the noise in the audible range is generated in the display-side casing.

For example, a portable communication terminal device described in Patent Document 1 disclosed by the applicant of the present application is known as a conventional display device that prevents the sound generated by driving the LCD panel. The LCD panel itself is installed by placing a rubber cap around the opening of the main body case as a housing, which is opened for the LCD panel as a display device, and attaching the LCD panel to the main body case with the rubber cap interposed therebetween. The vibration generated in the above is damped.
Japanese Patent Laid-Open No. 2005-210402

  By the way, according to the conventional mobile communication terminal device, although vibration caused by driving of the LCD panel can be attenuated, it is necessary to prepare and attach a member called a rubber cap in order to attenuate the vibration. There was a point that it would be desirable to improve the number of parts and assembly man-hours.

  An object of the present invention is to advantageously solve the above problems, and a display device according to the present invention includes a housing, a first display device disposed in the housing, and a housing disposed in the housing. A flexible printed circuit board having one end portion electrically connected to the first display device and mounted with a booster circuit that generates a driving voltage necessary for driving the first display device; The second display device disposed in the housing facing the back side of the first display device and an elastic member, and at least a part of the display surface of the second display device is exposed. An elastic holding member that holds the second display device in a state and is urged toward the back side of the first display device and is disposed in the housing, wherein the flexible printed circuit board is at least partially Is the back of the first display device Has a facing portion that faces the opposite portion of the flexible printed circuit board is characterized in that is brought into contact with the elastic holding member.

  In the display device according to the invention, the first display device and the second display device are arranged in a back-to-back orientation in the housing, and one end portion is electrically connected to the first display device, and A flexible printed circuit board on which a booster circuit that generates a driving voltage necessary for driving the first display device is mounted is disposed, and an elastic holding member formed of an elastic member holds the second display device in the housing. However, the elastic holding member is arranged to be urged toward the member located on the back side of the first display device, and the elastic holding member forms at least a part of the flexible printed circuit board and faces the back side of the first display device. It is in contact with the part.

  Therefore, according to the display device of the present invention, the vibration of the flexible printed circuit board caused by the driving of the LCD panel can be suppressed to suppress the sound generation in the casing, and the vibration of the flexible printed circuit board can be suppressed. For this reason, it is not necessary to prepare and attach a separate member, so that an increase in the number of parts and assembly man-hours can be avoided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing the internal configuration of the display-side casing of a foldable mobile phone as an embodiment of the display device of the present invention. FIGS. 2 (a) and 2 (b) FIG. 3 is a perspective view showing the entire folding cellular phone of the embodiment as seen from the front case side and the rear case side with the display side case and the character input side case opened to each other. 3 is a front view showing a single sub LCD holder incorporated in the display-side casing of the foldable mobile phone of the above embodiment, and FIGS. 4A, 4B, and 4C show the above embodiment. The front view which shows the state which assembled | attached the sub LCD hold | maintained with the sub LCD holder to the LCD unit built in the display side housing | casing of a folding-type mobile phone, a rear view, and the cross section along the AA line in the front view FIG. 5 (a), (b), (c) is the above implementation. The rear view which looked at the display side housing | casing of the folding-type mobile phone from the rear case side, the rear view which shows the display side housing | casing in the state which excluded the rear case, and the BB line in those rear views It is sectional drawing which follows. In the figure, reference numeral 1 denotes a foldable mobile phone of this embodiment.

  As shown in FIG. 2, the foldable mobile phone 1 of this embodiment includes a display-side housing 2 (housing) and a character input-side housing 3, and the display-side housing 2 includes a front case 2a. The rear case 2b is fitted to each other and fixed with a case fixing screw, and the character input side housing 3 is also fitted to the front case 3a and the rear case 3b. It is configured to be fixed with fixing screws. The display-side housing 2 and the character input-side housing 3 are connected to each other via a hinge portion 4 so as to be openable and closable. The display-side housing 2 is further connected to the hinge portion 4 in the folding mobile phone. Around the axis extending in the longitudinal direction of the telephone 1, it is connected so that it can be turned 180 degrees.

  As shown in FIG. 1, the display-side housing 2 is fitted with a trim plate 2d mounted with a switch button display case 2c for displaying the contents of the switch button on the outside of the front case 2a, and the front case 2a. And a rear case 2b, a main LCD 5 as a first display device, a metal frame 6, a circuit board 7, and a non-illustrated sub LCD formed by a non-conductive rubber-like elastic member, for example. A holder (elastic holding member) (sub LCD holder 8 shown in FIG. 3) and a sub LCD 9 as a second display device are built in the order from the front case 2a side. The main LCD 5 is a front case. 2a is visible from the outside through the trim plate 2d, while the sub LCD 9 is through the transparent window 2e at the center of the rear case 2b. It is visible from the outside Te. Various electronic components such as a speaker are mounted and electrically connected to the circuit board 7.

  On the other hand, the character input side housing 3 incorporates a circuit board (not shown) inside the front case 3a and the rear case 3b, and is not shown made of metal as a current-carrying member and an electromagnetic shield member over the circuit board. A shield case is built in, and a key flexible substrate (key FPC) (not shown) on which a plurality of key switches are mounted is overlaid on the shield case. A key sheet (not shown) is placed on the key FPC, and operation keys 11 are arranged at positions facing the key switches on the key sheet. The operation keys 11 are exposed from the front case 3a. Yes. Various electronic parts such as a microphone are mounted and electrically connected to the circuit board.

  Here, the main LCD 5 extends from one end portion (left end portion in FIG. 1) of the LCD body 5a, and a flexible printed circuit board (FPC) on which a booster circuit (not shown) for driving the LCD body 5a is mounted. 5b and three claws 5c projecting to the back side (downward in FIG. 1) of the LCD body 5a. Further, the frame 6 has a recess 6a in which the LCD body 5a is fitted on the front side (upward surface in FIG. 1), and a recess 6b in which the circuit board 7 is fitted on the back side (downward surface in FIG. 1). And has through holes 6c at positions corresponding to the three claws 5c of the LCD body 5a. The circuit board 7 has shallow cutout engaging portions 7a formed at outer peripheral edge positions corresponding to the three claws 5c of the LCD body 5a.

  As a result, as shown in FIG. 4, the LCD body 5a fits into the recess 6a of the frame 6, and the circuit board 7 fits into the recess 6b of the frame 6, and the three parts of the LCD body 5a. The claw 5c passes through the three through-holes 6c of the frame 6 and engages with the circuit board 7 by engaging with the three engaging portions 7a on the outer peripheral edge of the circuit board 7, and the LCD main body 5a and the frame 6 And the circuit board 7 are integrated to form the LCD unit 10.

  In the assembled state of the LCD unit 10, the FPC 5b of the main LCD 5 is bent toward the back side of the LCD main body 5a (upward in FIG. 5C) as shown in FIGS. Of the FPC 5b and the side portion 5e protruding laterally from the facing portion 5d of the FPC 5b is further outside the circuit board 7 ( 4 (a), the LCD main body 5a is connected to the connector 5f provided on the side portion 5e of the folded FPC 5b and the connector 7b on the substrate 7 facing each other. Is done. Thereby, the main LCD 5 is electrically connected to the circuit board 7.

  On the other hand, the sub LCD 9 has a flexible printed circuit board (FPC) 9b extending from one side of the LCD main body 9a (the front side in FIG. 1), and the LCD main body 9a is driven on the FPC 9b. The electronic circuit 9c is mounted. Further, as shown in FIG. 3, the sub LCD holder 8 includes a holding hole 8a for holding the sub LCD 9 in the central portion, an FPC pressing portion 8b as a non-conductive portion extending in the longitudinal direction, 4 and a fixing portion 8d for fixing to the frame 6 or the circuit board 7, and as shown in FIG. 4, the sub LCD 9 has its display surface (the surface facing upward in FIG. 4). All or most (at least a part) of is held in an exposed state. The LCD main body 9a of the sub LCD 9 is, as shown in FIG. 4, an LCD unit via a sub LCD holder 8 fixed by fitting the fixing portion 8d to the frame 6 and screwing to the circuit board 7. 10, the FPC 9 b of the sub LCD 9 extends on the connector protection portion 8 c of the sub LCD holder 8, is bent at a position beyond the tip of the connector protection portion 8 c, and is connected to the connector protection portion 8 c and the circuit board 7. The connector 9e provided at the sandwiched tip portion 9d and the connector 7c on the substrate 7 are connected to face each other. As a result, the sub LCD 9 is electrically connected to the circuit board 7.

  Such an LCD unit 10 is fitted in the rear case 2b of the display side housing 2 and assembled in the display side housing 2 as shown in FIG. In this state, as shown in FIG. 5C, the surface of the FPC pressing portion 8b of the sub LCD holder 8 that faces the facing portion 5d of the FPC 5b of the main LCD 5 is the surface of the LCD main body 5a. While facing the back side (downward in FIG. 1), the surface opposite to the back surface is in contact with the inner surface of the rear case 2b of the display-side housing 2, so that the FPC pressing portion 8b is connected to the back side of the main LCD 5. The opposing portion 5d of the FPC 5b is pressed against the bottom of the recess 6b of the frame 6.

  In this embodiment, the circuit board 7 has an extending portion 7d protruding from the frame 6, and has a component mounting portion 7e at the tip of the extending portion 7d. The extending portion 7d is also an LCD. In the state assembled to the unit 10, the facing portion 5 d of the FPC 5 b is pressed against the bottom of the recess 6 b of the frame 6. And since the component mounting part 7e is located in the front-end | tip part of the foldable mobile telephone 1, if an infrared communication element (IRDA), a rear speaker connector, etc. are mounted in the component mounting part 7e, for example, Infrared communication with a communication device or the like is made possible, and the rear speaker, which is usually located at the tip of the display-side housing 2, and the circuit board 7 can be easily electrically connected. The electronic component mounted on the component mounting portion 7e is not limited to these IRDA and rear speaker connectors, and may be other electronic components.

  Further, in this embodiment, an opening 8e is formed in the FPC pressing portion 8b of the sub LCD holder 8, and on the other hand, the opening 8e of the sub LCD holder 8 is adjacent to an end portion near the holding hole 8a. A light emitting diode (LED) (not shown) is mounted on the end of the substrate 7, and a light transmission (not shown) is provided at the center of the rear case 2 b of the display side housing 2 corresponding to the opening 8 e of the sub LCD holder 8. A window is provided, and the LED emits light when receiving an incoming call or the like, and the light can be seen through the light transmitting window of the rear case 2b.

  In the foldable mobile phone 1 of this embodiment, the main LCD 5 and the sub LCD 9 are arranged in a back-to-back orientation in the display-side housing 2 and one end thereof is connected to the LCD main body 5a of the main LCD 5. An FPC 5b mounted with a booster circuit that is electrically connected and generates a drive voltage necessary for driving the LCD main body 5a of the main LCD 5 is disposed, and is further formed in the display-side casing 2 by an elastic member. The sub LCD holder 8 holds the LCD main body 9a of the sub LCD 9 and is urged toward the bottom of the frame 6 located on the back side of the main LCD 5, and the FPC pressing portion 8b of the sub LCD holder 8 is The abutting portion 5d, which forms part of the FPC 5b and faces the back side of the main LCD 5, is located on the back side of the main LCD 5. It is pressed against the bottom of the frame 6.

  Therefore, according to the foldable mobile phone 1 of this embodiment, the vibration of the FPC 5b caused by the drive voltage generated by the booster circuit to drive the main LCD 5 is damped and the display-side housing 2 is driven. Since the sub LCD holder 8 can be used to suppress the noise and the FPC 5b is suppressed, it is not necessary to prepare and mount separate parts, avoiding an increase in the number of parts and assembly man-hours. can do. Further, since the sub LCD holder 8 is formed of a non-conductive elastic member, the sub LCD 9 is electrically insulated, and the periphery of the transparent window 2e of the rear case 2b is hermetically sealed. It is possible to suppress the entry of dust and the like into the surface.

  Further, according to the foldable mobile phone 1 of this embodiment, the LCD body 5a of the main LCD 5 is also integrated with the frame 6 and the circuit board 7 to form the LCD unit 10, so that the vibration of the LCD body 5a is also damped. In this respect, sound generation in the display side housing 2 can be suppressed, and the main LCD 5, the frame 6, the circuit board 7, and the sub LCD 9 are also used as the LCD unit 10 in the display side housing 2. Therefore, the number of assembling steps can be reduced and the assembling can be facilitated.

  Furthermore, according to the foldable mobile phone 1 of this embodiment, the FPC 5b of the main LCD 5 is formed so as to wrap around the back side of the main LCD 5 from the end on the LCD body 5a side to the facing portion 5d. Since the opposing portion 5d is pressed against the FPC pressing portion 8b of the sub LCD holder 8 due to the rebound resilience of the FPC 5b, the vibration of the FPC 5b is also suppressed from this point to suppress the sound generation in the display side housing 2. it can.

  Further, according to the foldable mobile phone 1 of this embodiment, the side portion 5e of the FPC 5b of the main LCD 5 is electrically connected via the connectors 5f and 7b, and the sub LCD 9 is also connected via the connectors 9e and 7c. And a circuit board 7 disposed in the display-side housing 2 in contact with the surface of the sub LCD holder 8 that faces the back side of the main LCD 5, and the facing portion of the FPC 5 b Since 5d is in contact with the extending portion 7d of the circuit board 7, the extending portion 7d, which is a component non-mounting area of the circuit board 7, is also used to dampen the vibration of the FPC 5b and display side housing 2 can be suppressed.

  Furthermore, according to the foldable mobile phone 1 of this embodiment, the sub LCD holder 8 is formed of a non-conductive material, and has the FPC pressing portion 8b which is a non-conductive portion, and is a portion facing the FPC 5b. Since 5d is brought into contact with the FPC pressing portion 8b which is a non-conductive portion, it is possible to prevent the printed wiring of the facing portion 5d of the FPC 5b from being electrically connected to each other or falling to the ground at the FPC pressing portion 8b. it can.

  Furthermore, according to the foldable mobile phone 1 of this embodiment, the surface of the FPC pressing portion 8b of the sub LCD holder 8 opposite to the surface facing the back side of the main LCD 5 is in contact with the inner surface of the rear case 2b. Since the FPC pressing portion 8b is pressed against the facing portion 5d of the FPC 5b by the inner surface of the rear case 2b, the vibration of the FPC 5b is suppressed from this point as well. It is possible to suppress the sounding of sound.

  Although the present invention has been described above based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, the display device of the present invention is portable. The present invention can also be applied to portable electronic devices other than telephones, such as palmtop computers and game machines, or other electronic devices.

  In the above-described embodiment, the sub LCD holder 8 and its FPC pressing portion 8b are formed of a non-conductive rubber-like elastic member. Instead, they are formed of soft plastic or a metal whose surface is insulated. Also good.

  Furthermore, although the first display device is the main LCD 5 and the second display device is the sub LCD 9 in the above-described embodiment, an organic electroluminescent display device (OLED) may be used instead.

  Thus, according to the display device of the present invention, the vibration of the flexible printed circuit board caused by the drive voltage generated by the booster circuit to drive the LCD panel can be damped to suppress the noise in the housing. In addition, since it is not necessary to prepare and attach a separate member for damping the flexible printed circuit board, an increase in the number of parts and assembly man-hours can be avoided.

It is a disassembled perspective view which shows the internal structure of the display side housing | casing of the foldable mobile telephone as one Example of the display apparatus of this invention. (A), (b) shows the whole folding cellular phone according to the above embodiment as viewed from the front case side and the rear case side with the display side case and the character input side case opened to each other. FIG. It is a front view which shows the sub LCD holder incorporated in the display side housing | casing of the foldable mobile telephone of the said Example alone. (A), (b), (c) is a front view showing a state in which the sub LCD held by the sub LCD holder is assembled to the LCD unit incorporated in the display-side casing of the foldable mobile phone of the above embodiment, It is a rear view and sectional drawing which follows the AA line in the front view. (A), (b), (c) is the rear view which looked at the display side housing | casing of the foldable mobile telephone of the said Example from the rear case side, In the state which removed the rear case from the display side housing | casing It is the rear view which shows, and sectional drawing which follows the BB line in those rear views.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Folding type mobile phone 2 Display side case 2a Front case 2b Rear case 2c Switch button display case 2d Trim plate 2e Transparent window 3 Character input side case 3a Front case 3b Rear case 4 Hinge part 5 Main LCD
5a LCD body 5b FPC
5c Claw 5d Opposing part 5e Side part 5f Connector 6 Frame 6a, 6b Recessed part 6c Through hole 7 Circuit board 7a Engagement part 7b, 7c Connector 7d Extension part 7e Component mounting part 8 Sub LCD holder 8a Holding hole 8b FPC pressing part 8c Connector protective part 8d Fixed part 8e Opening 9 Sub LCD
9a LCD body 9b FPC
9c Electronic circuit 9d Tip 9e Connector 10 LCD unit 11 Operation key

Claims (5)

A housing,
A first display device disposed in the housing;
A flexible print that is disposed in the housing, has one end portion electrically connected to the first display device, and a booster circuit that generates a drive voltage necessary for driving the first display device. A substrate,
A second display device disposed in the housing with a back side facing the back side of the first display device;
The second display device is held with an elastic member and at least a part of the display surface of the second display device is exposed, and is urged toward the back side of the first display device. An elastic holding member disposed in the housing,
The flexible printed circuit board has a facing portion at least partially facing the back side of the first display device;
The display device, wherein the facing portion of the flexible printed circuit board is brought into contact with the elastic holding member.   The display device according to claim 1, wherein the flexible printed circuit board is formed so as to wrap around to the back side of the first display device from the one end portion to the facing portion. A surface electrically connected to the other end of the flexible printed circuit board, electrically connected to the second display device, and facing the back side of the first display device of the elastic holding member; A circuit board disposed in contact with the housing;
The display device according to claim 1, wherein the facing portion of the flexible printed board is in contact with the circuit board. The elastic holding member includes a non-conductive portion formed of a non-conductor,
The display device according to claim 1, wherein the facing portion of the flexible printed circuit board is in contact with the non-conductive portion of the elastic holding member.   The surface of the elastic holding member opposite to the surface facing the back side of the first display device is in contact with the inner surface of the housing. The display device according to any one of the above.

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