JPH0616945U - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Purpose] In a simple matrix liquid crystal display device,
Make assembly work easy. [Structure] A plurality of scan electrodes 12 and a thin film transistor drive circuit 13 for driving the scan electrodes 12 are provided on an upper surface of a transparent substrate 11 of the scan electrode panel 1. Further, a plurality of signal electrodes 32 and a thin film transistor drive circuit 33 for driving these signal electrodes 32 are provided on the lower surface of the transparent substrate 31 of the signal electrode panel 2. In this case, as compared with the case where the drive circuit is composed of a semiconductor chip separate from the transparent substrate, the work of assembling the thin film transistor drive circuits 13 and 33 to the transparent substrates 11 and 31 is unnecessary, and therefore the assembling work is simplified. Become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal display device.

[0002]

[Prior art]

 In a simple matrix type liquid crystal display device, a plurality of scanning electrodes extend in the X direction on one surface of two transparent substrates facing each other, and a plurality of signal electrodes extend in the Y direction on the other surface. The display voltage is applied to the scan electrodes in order, and at the same time, the signal voltage is applied to the signal electrodes to perform display. Such a liquid crystal display device is provided with a drive circuit for driving the scan electrodes and a drive circuit for driving the signal electrodes, and a semiconductor chip constituting such a drive circuit is mounted on a transparent substrate by a COG. It is directly mounted by (Chip On Grass) or the like, or a TAB tape on which a similar semiconductor chip is mounted is bonded to a transparent substrate with an anisotropic conductive adhesive or the like.

[0003]

[Problems to be solved by the device]

 However, in such a conventional liquid crystal display device, when the semiconductor chip is directly mounted on the transparent substrate by COG or the like, the connection pads of the semiconductor chip and the external connection terminals of the transparent substrate must be aligned. The work is extremely difficult. On the other hand, when joining the TAB tape on which the semiconductor chip is mounted to the transparent substrate via an anisotropic conductive adhesive, etc., the connection terminal of the TAB tape and the external connection terminal of the transparent substrate. It is necessary to perform the alignment with the above, and this work is also extremely difficult, and there is a problem that the assembly work is difficult in any case. An object of the present invention is to provide a liquid crystal display device that can be easily assembled.

[0004]

[Means for Solving the Problems]

 This invention provides a plurality of scanning electrodes and a thin film transistor driving circuit for driving these scanning electrodes on one transparent substrate, and a plurality of signal electrodes and a thin film transistor driving circuit for driving these signal electrodes. Is provided on another transparent substrate.

[0005]

[Action]

 According to this invention, since the drive circuit is composed of the thin film transistors provided on the transparent substrate, the drive circuit is transparent compared to the conventional case where the drive circuit is composed of a semiconductor chip separate from the transparent substrate. The work for assembling to the board is not necessary, and therefore the assembling work can be simplified.

[0006]

【Example】

 FIG. 1 shows an essential part of a liquid crystal display device according to an embodiment of the present invention. This liquid crystal display device has a structure in which a signal electrode panel 2 is superposed on a scanning electrode panel 1 with a sealing material 3 interposed, and a liquid crystal 4 is sealed between them. 2 shows a plan view of the scanning electrode panel 1 and FIG. 3 shows a plan view of the signal electrode panel 2. As is clear from these figures, a part of the upper surface of the scanning electrode panel 1 and the signal electrodes are shown. A part of the lower surface of the pole panel 2 is a region that is not surrounded by the sealing material 3.

The scanning electrode panel 1 includes a transparent substrate 11 made of glass or the like. A plurality of scanning electrodes 12 made of ITO and a thin film transistor driving circuit 13 for driving the eccentric scanning electrodes 12 are provided in a region surrounded by the sealing material 3 on the upper surface of the transparent substrate 11. The plurality of scan electrodes 12 are insulating films 14 provided on the upper surface of the transparent substrate 11 (this insulating film is for forming the gate insulating film 17 of the thin film transistor drive circuit 13, and therefore, the portions of the scan electrodes 12 are included. May be omitted.) Is provided so as to extend in the X direction on the upper surface of () and is covered with the alignment film 15. In the thin film transistor drive circuit 13, the gate electrode 16 made of aluminum or the like is provided on the transparent substrate 11, the gate insulating film 17 made of silicon oxide or the like is provided on the gate electrode 16, and the gate insulating film 17 is provided. A semiconductor thin film 18 made of polysilicon or the like is provided, a source electrode 19 and a drain electrode 20 made of aluminum or the like are provided on both sides of the semiconductor thin film 18, and a passivation film 21 is provided on the entire upper surface. There is. The drain electrode 20 of the thin film transistor drive circuit 13 is connected to one end of the scanning electrode 12.

The signal electrode panel 2 includes a transparent substrate 31 made of glass or the like. A plurality of signal electrodes 32 made of ITO and a thin film transistor drive circuit 33 for driving the signal electrodes 32 are provided in a region surrounded by the sealing material 3 on the lower surface of the transparent substrate 31. The plurality of signal electrodes 32 is an insulating film 34 provided on the lower surface of the transparent substrate 11 (this insulating film is for forming a gate insulating film of the thin film transistor drive circuit 33. Therefore, in the portion of the signal electrode 32, May be omitted.) Is provided so as to extend in the Y direction and is covered with the alignment film 35. Although not shown in detail, the thin film transistor drive circuit 33 is composed of a thin film transistor that constitutes a data latch circuit, a shift register, etc., and is connected to one end of the signal electrode portion 32.

As shown in FIG. 2, the connection terminals of the thin film transistor drive circuit 13 of the scan electrode panel 1 are provided outside the area surrounded by the sealing material 3 on the upper surface of the transparent substrate 11 via the wiring 41. It is connected to the cross electrode 42. On the other hand, as shown in FIG. 3, a cross electrode 43 and a wiring 44 for the cross electrode 43 are provided at a predetermined portion outside the region surrounded by the sealing material 3 on the lower surface of the transparent substrate 31 of the signal electrode panel 2. An external connection terminal 45 connected via the is provided. The cross electrode 42 of the scan electrode panel 1 and the cross electrode 43 of the signal electrode panel 2 are connected via a columnar conductive material (not shown). Further, as shown in FIG. 3, the connection terminal of the thin film transistor drive circuit 33 of the signal electrode panel 2 is provided on the lower surface of the transparent substrate 31 via the wiring 46 and outside the region surrounded by the sealing material 3. It is connected to an external connection terminal 47 provided at a predetermined location.

As described above, in this liquid crystal display device, the plurality of scanning electrodes 12 and the thin film transistor drive circuit 13 for driving the scanning electrodes 12 are provided on the upper surface of the transparent substrate 11 of the scanning electrode panel 1, and the signal is provided. Since a plurality of signal electrodes 32 and a thin film transistor drive circuit 33 for driving these signal electrodes 32 are provided on the lower surface of the transparent substrate 31 of the electrode panel 2, the drive circuit is formed of a semiconductor chip separate from the transparent substrate. Compared with the conventional case, the work of assembling the thin film transistor drive circuits 13 and 33 on the transparent substrates 11 and 31 is not necessary, and therefore the assembling work can be simplified.

Although the thin film transistor drive circuits 13 and 33 are provided in the region surrounded by the sealing material 3 in the above embodiment, they may be provided outside the region surrounded by the sealing material 3. Of course good things.

[0012]

[Effect of device]

 As described above, according to the present invention, since the drive circuit is configured by the thin film transistor provided on the transparent substrate, the drive circuit is compared with the conventional case in which the drive circuit is configured by a semiconductor chip separate from the transparent substrate. As a result, the work of assembling the drive circuit on the transparent substrate becomes unnecessary, and therefore the assembling work can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view of a scanning electrode panel of this liquid crystal display device.

FIG. 3 is a plan view of a signal electrode panel of this liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scan electrode panel 2 Signal electrode panel 11 Transparent substrate 12 Scan electrode 13 Thin film transistor drive circuit 31 Transparent substrate 32 Signal electrode 33 Thin film transistor drive circuit

Claims (1)

[Scope of utility model registration request] 1. A plurality of scanning electrodes and a thin film transistor driving circuit for driving these scanning electrodes are provided on one transparent substrate, and a plurality of signal electrodes and a thin film transistor driving circuit for driving these signal electrodes are provided. A liquid crystal display device characterized by being provided on another transparent substrate.