JP3253488B2 - Display module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display module comprising a display panel using a liquid crystal or the like, and a wiring board for generating a signal voltage applied to the display panel.
An object of the present invention is to provide a display device that is resistant to shock and vibration by stably fixing a wiring board.

[0002]

2. Description of the Related Art As a display device, a liquid crystal display device (LCD) using liquid crystal for an optical member is used.
play) has the advantages of small size, low profile, low power consumption, etc.
Practical application is progressing in the fields of A equipment, AV equipment, and the like. In particular, a matrix type in which transparent electrodes for driving a liquid crystal are arranged in an intersecting manner to apply a voltage while selecting display points in a matrix,
Further, the active matrix type, in which a switch element is connected to each pixel capacitor for driving the liquid crystal and the signal voltage is constantly held electrostatically while selecting rewrite pixels line-sequentially, has high definition and high contrast. This makes it possible to display moving images at a higher ratio, and has been put to practical use in personal computer displays and televisions.

FIG. 3 shows a configuration diagram of an LCD module. (1) Front shield case, (2) LCD
A panel, (3) is a backlight unit, (4) is a spacer, (5) is a printed wiring board, and (6) is a rear shield case. In the front shield case (1),
An opening (1a) is provided so that an image on the LCD can be observed. The LCD panel (2) is one in which liquid crystal is sealed between a pair of transparent electrode substrates, and a TCP (tape) in which a driving LSI (8) is mounted by bonding on a flexible tape (7) such as polyimide formed by wiring with a copper foil. carrierpackage) (9). The connection method of such a drive circuit element portion is TAB
(Tape automated bonding). An interface circuit is mounted on the printed wiring board (5), and a driving LSI is provided via the printed wiring board (5).
A signal is supplied to (8). The backlight unit (3) includes a fluorescent lamp as a light source, a reflector disposed behind the fluorescent lamp, and a diffuser for uniformly irradiating the light from the fluorescent lamp and the reflector with the LCD panel (2). It is composed of a plate and is a surface light source. Spacer (4)
Is made of resin, supports the LCD panel (2), the backlight unit (3), and the printed wiring board (5), has relatively elasticity, and plays a role of protecting these components. The flexible tape (7) is made of an anisotropic conductive adhesive, that is, ACF (anisotropic conductive).
film), it is bonded to the terminal exposed on the LCD panel (2), and the copper foil wiring and the LCD wiring are connected. This LCD panel (2) is made of a spacer (4) with an adhesive.
The printed wiring board (5) is placed on the other side of the spacer (4), and the other end of the flexible tape (7) is bonded by solder. These LCD panel (2), spacer (4) and printed wiring board (5)
Has an outer wall formed by a front shield case (1) and a rear shield case (6) made of sheet metal. Further, a backlight unit (3) is inserted into the spacer (4).

[0004]

The conventional LC shown in FIG.
In the D module, the LCD panel (2) is fixed to the spacer (4) by an adhesive, while the printed wiring board (5) is bonded to the TCP (9) by soldering.
It is only supported between the spacer (4) and the rear shield case (6). Therefore, there is no mechanism for reliably stabilizing the printed wiring board (5), and it is susceptible to vibration and shock. In particular, in applications such as a vehicle-mounted or portable display device, the printed wiring board (5) is used during use. May shift. Therefore, the printed wiring board (5)
And TCP (9) connection and LCD panel (2) and TCP
The connection of (9) is damaged, or the printed wiring board (5) collides with the rear shield case (6), causing problems such as damage to elements and wiring on the printed wiring board (5). .

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a display panel, a drive circuit element for applying a voltage to the display panel, and a signal supplied to the drive circuit element. In a display module comprising a wiring board to be mounted, a housing for accommodating them, and a spacer for supporting the display panel, the driving circuit element and the wiring board, and fixing the wiring board, the display module includes: A structure in which a movable piece is provided on an inner frame portion that supports a wiring board, and a pressing portion is provided on an inner wall of the housing, and the movable piece is pressed and moved by the pressing portion to fix the wiring board to the spacer. It is.

[0006] In particular, the pushing portion is integral with the housing and has a slope portion. The movable piece is configured to be pushed and moved by a slope portion of the pushing section. Particularly, the movable piece is made of the same material as the spacer, and one end in the longitudinal direction is formed integrally with the spacer body.

[0007]

According to the structure of the present invention, since the wiring board is securely fixed to the spacer, it is resistant to vibration and impact, and the wiring board is displaced and moved in the housing, so that the wiring board may be damaged or the display panel, The connection between the drive circuit element and the wiring board is prevented from being damaged. The movable piece for fixing the wiring board is made of the same material as the spacer, and one end in the longitudinal direction is formed integrally with the spacer body.
The wall is formed integrally with the housing so as to have a slope with the wall protruding inward, and the module is assembled so that the slope of the pusher pushes the movable piece to move the movable piece to fix the wiring board to the spacer. Therefore, there is no additional work process or parts, which is advantageous in cost.

[0008]

Next, embodiments of the present invention will be described in detail.
FIG. 1 is a configuration diagram of an LCD module according to an embodiment of the present invention. (1) is a front shield case obtained by processing a sheet metal, and (2) is a transparent electrode formed on a transparent substrate.
An LCD panel in which a liquid crystal is sealed between a pair of transparent electrode substrates and a different voltage is applied to each pixel to control a transmittance distribution corresponding to display image information, and (3) light is applied to the LCD panel (2). A backlight unit that irradiates and gives visibility to transmittance distribution, (4) a spacer made of a resin material, (5) a printed wiring board having a predetermined circuit pattern formed on a glass epoxy resin, and (6) a sheet metal It is a rear shield case consisting of The front shield case (1) is provided with an opening (1a) so that an image on the LCD can be observed. On the LCD panel (2), a TCP (tape carrier package) (9) formed by bonding and mounting a driving LSI (8) on a polyimide tape (7) on which wiring is formed by copper foil is provided with an anisotropic conductive material. The adhesive, that is, ACF (anisotropic conducti)
ve film) and electrically connected to the LCD electrode wiring. The other end of the TCP (9) is connected to the printed wiring board (5) by solder. An interface circuit is mounted on the printed wiring board (5), converts an input signal for driving the LCD, and distributes it to each driving LSI (8).

Although the spacer (4) is made of an insulating resin, a movable piece (10) made of the same material as the main body of the spacer (4) is provided at the four corners of the inner frame into which the printed wiring board (5) is fitted. However, one end in the longitudinal direction is formed integrally with the spacer (4) main body. In addition, the movable piece (10)
In the rear shield case (6) corresponding to (1), a mountain-shaped pressing portion (11) having a top inside is formed.

FIG. 2 is an enlarged sectional view showing an interaction relationship between the movable piece (10) and the pressing portion (11) when the assembly of the LCD module according to the embodiment of the present invention is completed. Reference numerals in the drawing indicate the same objects as those used in FIG.
An end of the printed wiring board (5) is connected to a support (4) provided below the inner frame of the spacer (4) (on the front side of the module).
a) It is on top. A movable piece (10) formed integrally with the spacer (4) main body is provided on the upper inside (the rear side of the module) of the spacer (4). In the rear shield case (6), a pressing portion (11) protruding in a mountain-like shape is formed inside, so that the inclined surface portion hits the movable piece (10). For this reason, by attaching the rear shield case (6) to the spacer (4) on which the printed wiring board (5) is mounted, the inclined portion of the pressing portion (11) can move the movable piece (10) against the elasticity. Since the movable piece (10) is pushed inward, the movable piece (10) protrudes from the inner frame wall of the spacer (4), and the printed wiring board (5) is securely fixed to the support (4a).

The method of assembling the LCD module according to the present invention will be described with reference to FIG. First, the input end of the LCD panel (2) and one end of the TCP (9) are bonded by ACF. The LCD panel (2) is bonded to the front of the spacer (4), and the printed wiring board (5) is placed on the back of the spacer (4), and the TCP (9) is printed from outside the spacer (4). Turn on the board (5) and solder the other end. At this point, the printed wiring board (5)
It is only temporarily fixed to the spacer (4) by the solder connection with the TCP (9). These components consist of a front shield case (1) and a rear shield case (6)
The outer wall is formed by covering from the front and back. At this time, as shown in FIG. 2, the inclined surface of the pressing portion (11) provided on the rear shield case (6) pushes and moves the movable piece (10) provided on the spacer (4), whereby the printed wiring is formed. The substrate (5) is securely fixed. Finally, the backlight unit (3) is connected to the spacer (4).
The module is completed by inserting the module into a predetermined position.

The movable piece (10) and the pusher (11), which are the characteristic components of the present invention, are formed integrally with the spacer (4) and the rear shield case (6), respectively, and are printed wiring. Since the fixing of the substrate (5) is automatically performed by mounting the rear shield case (6), no additional man-hours are required and there is no increase in cost.

[0013]

As is apparent from the above description, according to the present invention, the spacer for supporting and fixing the display panel and the wiring board for generating the signal voltage to be supplied to the display panel is made of the same material as the spacer body. In addition to forming a movable piece that is integral with, and by forming a push portion at the position where the movable piece is pushed and moved on the inner wall of the module housing, the wiring board is securely fixed to the spacer just by assembling a normal module, It is possible to prevent the wiring board from shifting and moving in the housing.
Therefore, the wiring board is not damaged, and various connection portions between the wiring board and the display panel are not damaged.

Further, since the wiring substrate is fixed to a relatively elastic resin spacer, a display device which does not collide with a housing wall made of sheet metal and is resistant to vibration and impact can be obtained. Further, since the movable piece is an integral product with the spacer, the pressing portion is an integral product with the housing, and the fixing of the wiring board to the spacer is automatically completed by the conventional assembling work. In addition, there is no need for additional work steps, and there is no increase in cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an LCD module according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the LCD module according to the embodiment of the present invention.

FIG. 3 is an enlarged view of a conventional LCD module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front shield case 2 LCD panel 3 Spacer 4 Backlight unit 5 Printed wiring board 6 Rear shield case 7 Flexible tape 8 Driving LSI 9 TCP 10 Movable piece 11 Push part

Continuation of front page (56) References JP-A-1-182826 (JP, A) JP-A-2-214823 (JP, A) JP-A-3-175426 (JP, A) JP-A-4-58283 (JP) , A) Japanese Utility Model 1-60246 (JP, U) Japanese Utility Model 2-47622 (JP, U) Japanese Utility Model 3-58677 (JP, U) Japanese Utility Model 3-58678 (JP, U) Japanese Utility Model 4-40221 (JP, U) JP-A 4-57821 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09F 9/00 G02F 1 / 1343,1 / 1345,1 / 135 G02F 1 / 136,1 / 1365,1 / 1368

Claims (3)

(57) [Claims] 1. A display panel, a driving circuit element for applying a voltage to the display panel, a wiring board for supplying a signal to the driving circuit element, a housing for accommodating them, the display panel, and the driving circuit element And a spacer supporting the wiring board and fixing the wiring board to the inside of the housing, wherein the spacer is provided with a movable piece in an inner frame portion supporting the wiring board and an inner wall of the housing. Wherein the movable piece is pushed and moved by the pushing part to fix the wiring board to the spacer. 2. The pusher is formed integrally with the housing,
The display module according to claim 1, further comprising a slope, wherein the movable piece is pushed by the slope of the pusher. 3. The display module according to claim 1, wherein the movable piece is made of the same material as the spacer, and one end in a longitudinal direction is formed integrally with the spacer body.