JPH09146113A - Display module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the dielectric breakdown of an integrated circuit element by coming of a TCP mounted with an LSI for driving an LCD panel into contact with conductive shielding cases and the consequent electrification. SOLUTION: This LCD module is constituted by housing the TCP 8 consisting of the LCD panel 2 for display, the LSI 16 for driving and a flexible tape 7 and a spacer 3 for supporting these members into the shielding case 1. A side wall stopper 13 integral with the spacer 3 is formed in the part of supporting the TCP 8 and is terminated at the TCP 8. The TCP 8 is surely insulated from the shielding cases 1, 5 consisting of metals and, therefore, even if the shielding cases 1, 5 are electrified, the integrated circuit element of the TCP 8 is prevented from inducing dielectric breakdown.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display module using a liquid crystal display panel and a backlight for illuminating the display panel with light.

[0002]

2. Description of the Related Art As a display device, a liquid crystal display device (LCD: Liquid Crystal Display) using a liquid crystal as an optical member.
play) has advantages such as small size, thin shape and low power consumption.
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 liquid crystal are arranged in a cross manner and a voltage is applied while selecting display points in a matrix,
Furthermore, the active matrix type, in which a switch element is connected to each pixel capacitor for liquid crystal driving and the signal voltage is electrostatically always held while line-sequentially selecting rewriting pixels, is a high-definition, high-contrast type. It has become possible to display moving images in a ratio, and has been put to practical use in personal computer displays, televisions, etc.

FIG. 3 is a perspective view showing the structure of a conventional LCD module, and the size of the display module is limited to the effective display surface of the display panel by erecting the peripheral drive section in a direction perpendicular to the panel plane. It is a structure that realizes a narrower frame by bringing them closer together. In particular, the figure shows a backlight embracing type in which a backlight is held in a space formed by the display surface and the peripheral drive surface. FIG.
[FIG. 4] is a sectional view of an essential part of this. (1) is a front shield case, (2) is an LCD panel, (3) is a spacer,
(4) is a printed wiring board, and (5) is a rear shield case. (6) is a drive LSI, and (7) is a flexible tape such as polyimide having wiring formed of copper foil. The LCD panel (2) is formed by sealing liquid crystal between a pair of electrode substrates in which predetermined electrode wirings are finely processed and formed on a substrate such as glass. TCP with a drive LSI (6) bonded on a flexible tape (7)
The (tape carrier package) (8) is attached to the larger substrate of the LCD panel (2). Such a connection method of the drive circuit element part is TAB (tape automat
edbonding) is called. Printed wiring board (4)
An interface circuit is mounted on the drive circuit, and the drive LSI (6) is controlled via the printed wiring board (4). The LCD panel (2) and the TCP (8) are supported by the spacer (3) in the shield case (1, 5) to form a display unit. Also,
Reference numeral (9) is a backlight unit, which includes a fluorescent lamp (11) and a light guide plate (12) in a lamp case (10).
Is provided.

One end of the flexible tape (7) is an anisotropic conductive adhesive, that is, ACF (anisotropic conduc).
tive film) is connected to the terminal portion exposed on the LCD panel (2), the other end is soldered to the printed wiring board (4), and the LCD panel (2) and the TCP are connected.
(8) is supported by the spacer (3).

[0005]

As shown in FIG. 4, in the conventional LCD module, the TCP (8) is shielded from the shield case (1, 5) so as not to come into contact with the conductive shield case (1, 5). It was housed so as to be separated from it by a certain distance. That is, since the shield case (1, 5) that constitutes the outer wall is made of a conductive material such as metal, it is charged when touching a human body or another object, and the printed wiring board (4) for mounting the integrated circuit or for driving. A large current is applied to the LSI (7) or the like to change the input / output characteristics, so-called electrostatic breakdown is likely to occur. However, the shield case (1,
In 5), TCP (8) is a shield case (1,
When it comes to securing a space enough to separate from 5),
The depth of the shield case (1, 5) itself becomes deep, which hinders miniaturization of the module, particularly, thinning.

In order to solve such a problem, conventionally, an insulating sheet such as polyester tape is attached to the inside of the shield case (1, 5), or an insulating film such as polycarbonate or nylon is attached to the inner surface. There are methods such as adhesion processing. However, in all of these methods, an expensive sheet or film is required, and an additional step of attaching an insulating tape is required, resulting in an increase in cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and includes a display panel, a peripheral portion for supplying a signal to the panel, and the peripheral portion connected to the panel. And a shield case for accommodating the panel, the peripheral portion and the connection substrate, and a spacer for supporting and fixing the panel, the peripheral portion and the connection substrate in the shield case. In the display module, the peripheral portion of the spacer and a supporting portion of the connection substrate are provided with a wall portion that is directed to the peripheral portion or the end of the connection substrate, and the peripheral portion and the connection substrate are separated from the shield case. It is configured to be electrically insulated.

In particular, the peripheral portion includes a driving portion for supplying a signal to the panel and a control portion for controlling the driving portion, and the connection board supports the driving portion,
The drive unit and the panel and the drive unit and the control unit are electrically connected. As a result, the periphery is not required to be spatially separated in the shield case.
The peripheral part for driving the panel, which is composed of the drive unit and the control unit, is insulated from the shield case, so that the module can be downsized and the drive unit and the control unit can be kept static by static electricity charged in the shield case. The electric breakdown is eliminated and the reliability is improved.

[0009]

Next, embodiments of the present invention will be described in detail. FIG. 1 shows an LCD according to an embodiment of the present invention.
FIG. 3 is a perspective view showing the configuration of the module, and FIG. 2 is a cross-sectional view of the main part thereof. (1) is a front shield case processed by sheet metal, (2) is a liquid crystal sealed between a pair of transparent electrode substrates in which transparent electrodes are formed on a transparent substrate, and a different voltage is applied to each pixel for display. An LCD panel controlled to have a transmittance distribution corresponding to image information, (3) a spacer made of a resin material, (4) a printed wiring board having a predetermined circuit pattern and integrated circuit elements formed on a glass epoxy resin, ( 5) is a rear shield case made of sheet metal. (6) is a drive LSI, which supplies a signal voltage for driving the LCD panel (2). (7)
Is a flexible tape made of polyimide or the like, and the conductor is formed of copper foil. On the larger substrate of the LCD panel (2), a TCP (tape) formed by bonding a drive LSI (6) on a flexible tape (7).
A carrier package (8) is bonded by an anisotropic conductive adhesive, that is, an ACF (anisotropic conductive film), and electrically connected to the LCD electrode wiring. T
The other end of the CP (8) is soldered to the printed wiring board (4)
It is connected to the. An interface circuit is mounted on the printed wiring board (4), which converts an input signal for LCD driving, distributes it to each driving LSI (6), and controls it. These LCD panel (2) and TCP (8)
Are supported by the spacers (3), and the outer frame is formed by the shield cases (1, 5) to be assembled into the display module. Spacer (3) TCP
A side wall stopper (13) having a shape standing upright with respect to the supporting surface is formed in the supporting portion of (8), and
It is addressed to the end of P (8).

Further, (9) is a backlight unit which irradiates the LCD panel (2) on the display module side with parallel light to give visibility to the transmittance distribution to form a display image. In the backlight unit (9), a fluorescent lamp (10) as a light source and a light guide plate (12) for converting light from the fluorescent lamp (11) into a planar light source are housed in a resin lamp case (10). Become.

In the present invention, since the sidewall stopper (13) is directed to the terminal end of the TCP (8) and electrically insulated from the shield case (1, 5) in this manner, TC
The P (8) will not come into contact with the shield case (1, 5). Therefore, even if the shield case (1, 5) made of a conductive material comes into contact with a human body or another object and is charged, the TCP (8) is electrostatically protected, and thus the electrostatic breakdown occurs. It never arrives. Therefore, it is not necessary to increase the size of the shield case (1, 5) in order to separate the TCP (8) and the shield case (1, 5), and the TCP (8) is directed to the side wall stopper (13) to shield the TCP (8). The shield case (1,5) can be made as small as possible by processing it to such a size that it can contact (1,5), and the module can be made compact and thin. can do.

[0012]

As is apparent from the above description, according to the present invention, the peripheral driving part for supplying the driving voltage to the display panel is integrated with the spacer for supporting and fixing the panel and the peripheral driving part in the shield case. By the side wall stopper,
Even if the conductive shield case is electrified by addressing it at its end and electrically insulating it from the shield case,
It is possible to prevent static electricity from being transmitted to the peripheral driving unit, prevent electrostatic breakdown, and improve reliability. Therefore, a space for sufficiently separating the peripheral drive unit from the inner wall of the shield case is not required in the shield case, and as a result, the module can be made smaller and thinner.

[Brief description of the drawings]

FIG. 1 is a perspective view of an LCD module according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of the LCD module according to the embodiment of the present invention.

FIG. 3 is a perspective view of a conventional LCD module.

FIG. 4 is a sectional view of a main part of a conventional LCD module.

[Explanation of symbols]

 1 Front Shield Case 2 LCD Panel 3 Spacer 4 Printed Wiring Board 5 Rear Shield Case 6 Driving LSI 7 Flexible Tape 8 TCP 9 Backlight Unit 10 Lamp Case 11 Fluorescent Lamp 12 Light Guide Plate 13 Sidewall Stopper

Claims (2)

[Claims] 1. A display panel, a peripheral portion that supplies a signal to the panel, a connection board on which a conductive wire that connects the peripheral portion to the panel is formed, the panel, the peripheral portion, and the connection board In a display module comprising a shield case for accommodating the panel, the panel, the peripheral portion and the connection substrate in the shield case, the display module comprising: a spacer for supporting and fixing the panel, the peripheral portion, and the connection substrate, A display module, wherein a wall portion is provided to the peripheral portion or a terminal of the connection board, and electrically insulates the peripheral portion and the connection board from the shield case. 2. The peripheral section includes a driving section that supplies a signal to the panel, and a control section that controls the driving section,
The display module according to claim 1, wherein the connection board supports the driving unit and electrically connects the driving unit and the panel and the driving unit and the control unit.