JPH036523A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To simplify a constitution, to reduce the cost and size, and to make the device thin by constituting the liquid crystal display device with a wiring board, a semiconductor integrated circuit element for driving the liquid crystal display element, and a rigid metallic cover body which is fitted in surface contact with the opposite surface of the wiring board and covers the neighborhood of the semiconductor integrated circuit element. CONSTITUTION:The display device is constituted of the liquid crystal display element 21, the wiring board 22 which is connected electrically to the liquid crystal display element 21 while arranged in parallel, an electronic component 23 as the semiconductor integrated circuit element, such as an integrated circuit and a large-scale integrated circuit, which drives the liquid crystal display element 21, and the metallic cover body 24 which covers the neighborhood of the electronic component 23. Namely, the wiring board 22 is pressed by the cover body 24, so the wiring board 22 is prevented from deforming by wrapping, etc. Consequently, the device can be manufactured at low cost without making the constitution complex and the thickness and size of the liquid crystal display device are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display device that can be advantageously implemented in electronic devices such as electronic desktop calculators, facsimile machines, and electronic notebooks.

Conventional technology FIG. 3 is a typical prior art cross-sectional view.

A liquid crystal display device 1 includes a printed wiring board (PWB) 3 on which an electronic component 2 such as an integrated circuit (IC) or a large-scale integrated circuit (LSI) is mounted, and a rubber stripper 4 and flexible wiring. Liquid crystal display elements 6 are stacked with substrates (FBC) 5 interposed therebetween, and a supporting metal fitting 7 is fitted around the periphery of the α-crystal display element 6, whereby the liquid crystal display element 21 and the wiring board 3 are fixed. Ru. The liquid crystal display element 6 and the wiring board 3 are electrically connected by the rubber cover/lid 4 and the flexible wiring board 5, and are also electrically connected by a through hole 8 provided in the wiring board 3. ing. Further, in order to prevent unnecessary radiation (FCC), a metal shield plate 9 is provided separately from the liquid crystal display device 1.

In such prior art, each component of the liquid crystal display device 1, that is, the liquid crystal display element 6, the printer I/wiring board 3, the electronic component 2, the shield plate 9, etc. is configured to be stacked in this order. , the thickness of the entire device including the liquid crystal display device 1 is determined according to the sum of the thicknesses of these components, resulting in a relatively large thickness.

In order to solve this problem, conventionally, a fitting hole 10 into which the electronic component 2 can fit is formed in the wiring board 3 as shown in FIG. A configuration is used in which the connection terminals of the electronic component 2 are electrically connected to the wiring board 3 while the electronic component 2 is fitted.

However, in such prior art, since the wiring board 3 is formed with the fitting hole 10 into which the electronic component 2 is fitted, the area on the wiring board 3 that can be wired is reduced. It is not possible to provide the through hole 8 in the rear part where the wiring board 2 is arranged, and therefore it may become impossible to form a desired wiring pattern on the surface of the wiring board 3. Even if it is possible to form the wiring layer 11 with a desired wiring pattern, the wiring pattern of the wiring M11 will have an extremely high density of 4, and the manufacturing cost will increase to form such a complicated wiring pattern. The problem was that it was expensive.

Problems to be Solved by the Invention Therefore, an object of the present invention is to solve the above-mentioned technical problems, to be able to manufacture the product at low cost without complicating the structure, and to achieve miniaturization and thinning. An object of the present invention is to provide a liquid crystal display device.

Means to solve problems The present invention includes a liquid crystal display element; Conductors are formed on both surfaces of a rigid electrically insulating substrate.

A wiring board that is electrically connected with the conductors on both surfaces facing each other and arranged in parallel, and a wiring board! ! a semiconductor integrated circuit element for driving the liquid crystal display element disposed on the surface of the substrate opposite to the liquid crystal display element and electrically connected to a conductor formed on the opposite side; and the opposite side of the wiring board. This liquid crystal display device is characterized in that it includes a rigid metal cover that is removed in surface contact with the surface of the semiconductor integrated circuit element and covers the vicinity of the semiconductor integrated circuit element.

According to the present invention, a semiconductor integrated circuit element for driving the liquid crystal display element is connected to the surface of the wiring board having conductors formed on both surfaces, opposite to the side on which the liquid crystal display element is arranged,
A rigid metal cover is attached to cover the vicinity of the semiconductor integrated circuit element in surface contact with the opposite surface of the wiring board. Therefore, since the wiring board is held down by the cover, deformation such as warping of the wiring board can be prevented. As a result, it is possible to reduce the thickness of the wiring board to such an extent that distortion and warpage of the wiring board does not occur as in the conventional case, and therefore, the thickness of the entire device can be reduced in accordance with the thickness of the wiring board. This allows the liquid crystal display device to be made thinner and smaller.

Moreover, since the semiconductor integrated circuit element is covered with an integral cover, it is possible to prevent unnecessary radiation such as noise to the semiconductor integrated circuit element and the conductors on the wiring board. There is no risk of such things getting in, and the reliability of electrical performance is improved.

Embodiment FIG. 1 is an enlarged sectional view showing a liquid crystal display device 20 according to an embodiment of the present invention. For example, the reflective liquid crystal display device 20 basically includes a liquid crystal display element 21 and a liquid crystal display element 2.
1, and the liquid crystal display element, such as an integrated circuit (IC) or a large-scale integrated circuit (LSI), connected to the wiring board 22. It includes an electronic component 23 which is a semiconductor integrated circuit element for driving the electronic component 21, and a rigid metal cover unit 24 that covers the vicinity of the electronic component 23.

The liquid crystal display element 21 includes a pair of transparent glass substrates 25 and 26 in which liquid crystal is sealed between surfaces facing each other, a deflection plate 27 disposed on the glass substrate 25, and a polarization plate 27 on the back side of the glass substrate 26. and a reflective plate 28 arranged therein. On the surface of the glass substrate 25 facing the glass substrate 26,
A segment electrode 29 is formed, and a common electrode 30 is formed on the surface of the glass substrate 26 facing the segment electrode fI29. The segment electrodes 29 are selectively connected to a wiring layer 32, which is a conductor, formed on one surface of the wiring board 22 by a rubber connector 31. This connector 31 is
A longitudinal rod-like body 35 made of an electrically insulating material having elasticity such as rubber, and a conductive material such as copper arranged individually within the rod-like body 35 at intervals corresponding to the wiring pattern of the wiring 132. It consists of a connecting piece 36. With such a connector 31, two segment electrodes and a wiring layer 32 can be connected.
A separate electrical connection is made with the Further, the common electrode 30 on the glass substrate 26 is connected to the wiring layer 33 by a flexible wiring board 37. Wiring 113 of wiring board 22
Wiring layers 38a and 38b, which are conductors, are formed on the surface opposite to the side where 3 is formed. Connection terminals 39a and 39bIJc of the electronic component 23 are individually connected to this wiring layer 38. The wiring layer 38b to which the connection terminal 39b of the electronic component 23 is connected is connected to the wiring layer 33 formed on the surface side of the board through a through hole 10 that communicates with the wiring board 22 in its thickness direction. Therefore, electronic component 2
3 connection terminal 39L) and the liquid crystal display element 21; pole 3
6 is electrically connected. Also, the connection terminal 39;L of the S7 part 23 is connected to the wiring 1 by the through hole 41.
132. Therefore, the connection terminal 39a and the segment voltage fgI29 are electrically connected.

On the surface of the wiring board 22 on which the wiring layer 38 is formed,
As shown in FIG. 2, a cover unit 24 is disposed in which a covering layer made of an electrically insulating material is formed on a metal material such as iron or aluminum.

This cover unit 24 has a plurality of fitting holes 43 into which the main body 23εt of the electronic component 23 is fitted, and a plurality of notches 44 are formed in the peripheral edge and are grounded. These liquid crystal display element 21, wiring board 22, and cover assembly 24 are fixed by a metal support member 45 called a bezel. This support member 15 has a plurality of engaging pawls 46 at intervals corresponding to the notches 44 formed in the cover unit 24.
is formed. When fixing the liquid crystal display element 21, the wiring board 22, and the cover unit 24 using such a support member 45, the engaging claw 46 is inserted into the notch 44, and then the engaging claw 46 is inserted into the notch 44. By bending inward, the cover unit 24 is locked by the bent portion. In this way, the liquid crystal display element 21,
When the wiring board 22 and the cover assembly 24 are fixed by the support member 45, the glass substrate 25 of the liquid crystal display element 21 is connected to the connector 31 and the support portion 4 of the support member 45.
8 and to which the flexible wiring board 37 of the glass substrate 26 is connected is supported by four buffer members made of an elastic and flexible material such as silicon. There is.

Therefore, even if vibrations, impact forces, etc. act on the liquid crystal display device 20, the liquid crystal display element 21, the wiring board 22, and the cover unit 24 will not be displaced from each other.

Further, since the wiring board 22 is held down by the cover unit 24, its thickness T can be made thin, for example, the thickness T = O-6 mm or less.

In other words, even if the thickness T of the wiring board 22 is reduced, since the cover unit 24 is pressed without surface contact as described above, the wiring board 22 will not warp or curve, and the connector 31 will not warp or curve. It is possible to maintain a reliable electrical connection state with the electronic component 2 and the flexible wiring board 37.
3 can be securely held on the board 22 in a state where it is electrically connected. An integrated cover 24 is provided to cover these electronic components 23, and since the integrated cover 24 is made of a conductive material v4 such as aluminum or iron, unnecessary radiation from the outside can be prevented.

Effects of the Invention According to the present invention, since the semiconductor integrated circuit element for driving the liquid crystal display element is covered with a rigid metal cover, the semiconductor! It is possible to support the wiring board to which the integrated circuit element is connected and prevent the wiring board from bending or warping, thereby eliminating the need for the wiring board to be thick enough to take warp or bending into consideration, unlike conventional wiring boards. Therefore, the wiring board can be made thinner than in the prior art.

This allows the liquid crystal display device to be made thinner and smaller. In addition, since the semiconductor tA integrated circuit element is covered with an integrated cover, it is possible to prevent unnecessary radiation from the outside and prevent noise from entering the liquid crystal drive signal, thereby ensuring reliable liquid crystal display. The driving operation can be performed and the reliability can be improved.

[Brief explanation of the drawing]

No. 10 is an enlarged cross-sectional view showing a liquid crystal display device 20 according to an embodiment of the present invention, No. 2 (2I is an exploded perspective view of the liquid crystal display device 20 shown in FIG. 1, and No. 311W is a cross-sectional view of a typical prior art. FIG. 4 is a sectional view showing another prior art.

Claims (1)

[Claims] Conductors are formed on both surfaces of a liquid crystal display element and a rigid electrically insulating substrate, and the conductors on both surfaces are electrically connected to each other while being arranged in parallel and facing each other. a wiring board; a semiconductor integrated circuit element for driving a liquid crystal display element disposed on a surface of the wiring board opposite to the liquid crystal display element and electrically connected to a conductor formed on the opposite side; mounted in surface contact with the opposite surface of the substrate,
A liquid crystal display device comprising: a rigid metal cover body that covers the vicinity of a semiconductor integrated circuit element.