JPS62296124A - Matrix type liquid-crystal display device - Google Patents

Abstract

PURPOSE:To contrive to wider the displaying screen of a matrix type display device by providing plural array base plates on a transparent reinforced base plate and a facing base plate provided with a transparent facing electrode on its surface facing the surface formed by the array base plates, and then, filling the space formed by the plural array base plates and facing base plate with liquid crystal. CONSTITUTION:A base plate 36 is formed by arranging and fixing with an adhesive array base plates 31, 32...34 on and to the upper surface of a reinforced base plate 35. The base plate 36 is faced to another base plate 40 provided with a transparent common electrode and the space formed by the base plates 36 and 40 is filled with liquid crystal 45. Gate lines Yj (j=1, 2...n) are successively scanned by means of address signals and a thin-film transistor TFT is successively conducted by Tf/n period (Tf=frame scanning period) at every line. Synchronously to the scanning of the gate lines Yj, m-parallel picture element signals are supplied to data lines Xi (i=1, 2...m). Therefore, signal voltages are successively led to transparent picture element electrodes at every line and the liquid crystal 45 held between the picture element electrodes and transparent facing electrode is excited.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention relates to a matrix type liquid crystal display device using thin film transistors (hereinafter referred to as TPT) as switching elements.

(Prior Art) Recently, display devices using liquid crystals or electroluminescent (EL) are aimed at television displays, graphic displays, etc., and have a large capacity.

High-density active matrix liquid crystal display devices are being actively developed and put into practical use. This type of display device provides high-contrast display without crosstalk.
A semiconductor switch is used as a means for driving and controlling each pixel. As a semiconductor switch, single crystal S
There are MO5 type FETs formed on i-substrates, TPTs formed on transparent substrates, which are capable of transmissive display, and can easily be made large in area.

FIG. 4 is a sectional view showing an example of a liquid crystal display device equipped with the above TPT array. In the same figure, glass substrate 1
A gate electrode 2 integral with the gate line is formed thereon, and an insulating film 3 is further formed to cover this. A semiconductor layer 4 made of, for example, amorphous silicon is formed at a predetermined position on the insulating film 3. A drain electrode 7 and a source electrode 8 are formed on this semiconductor layer 4 so as to sandwich this layer therebetween. In this case, the drain electrode 7 and the source electrode 8 are formed via impurity-doped amorphous silicon films 5 and 6 that have a function of making good contact with the semiconductor layer 4. Although not shown in the drawing, the drain electrode 7 is formed integrally with a predetermined data line. Further, the source electrode 8 is formed so as to be electrically connected to a transparent pixel electrode 9 formed on the insulated film 3.

Next, the above semiconductor layer 4, drain electrode 7, source electrode 8
This portion is covered with an insulating protective film 10, and furthermore, a liquid crystal aligning film 11 is coated 711 on the entire upper surface.

The first substrate 100 is configured in this way.

On the other hand, in the second substrate 200, a common electrode 22 and a liquid crystal alignment film 23 are sequentially formed on a glass substrate 21.

The peripheral portion of the glass substrate 1.21 is sealed with a gap of about 10 μm maintained, and liquid crystal is further sealed in this gap to form a liquid crystal layer 30.

FIG. 5 is a perspective view of the liquid crystal display device before assembly;
FIG. 6 is a sectional view after assembly. When assembling,
The gate line pad and data line pad of the first substrate 100 are assembled so as to be located outside the spacer.

(Problems to be Solved by the Invention) The conventional matrix liquid crystal display device described above has many problems in manufacturing a large-area display device. This is because when manufacturing the first substrate, the larger the area, the greater the probability of element defects.Furthermore, the manufacturing equipment itself has become larger and requires high manufacturing precision. and requires expensive equipment. Furthermore, as the area of the substrate increases, the substrate often warps, resulting in problems such as deterioration of product yield.

Therefore, the present invention provides a matrix type liquid crystal display device that can easily increase the display area, does not require the use of special manufacturing equipment to increase the size, and can maintain reliability as a product. The purpose is to

[Structure of the Invention (Means for Solving Problems)] This invention comprises a plurality of array substrates in which thin film transistors are arranged in a matrix on one upper surface of an insulating substrate, and a transparent reinforcing substrate in contact with a surface of which the plurality of array substrates are disposed on the same plane; a counter substrate having a transparent counter electrode formed on a surface opposite to the surface formed by the plurality of array substrates; A matrix type liquid crystal display device is constituted by the array substrate and the liquid crystal sandwiched between the counter substrate.

(Function) With the above configuration, the array substrate on which thin film transistors are formed is manufactured by dividing it, so the area at this stage may be small, and it can be manufactured with an appropriate area with a high yield. . In addition, a size that does not cause the substrate to warp can be selected, and there is no need to prepare particularly large manufacturing equipment.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a diagram showing an equivalent circuit of an embodiment of the present invention. In the same figure, (Xi), (i-1°2,..., m)
is a plurality of data lines, (Yj).

(j-1, 2,..., n) are multiple gate lines perpendicular to these, and these data lines (Xi) and gate lines (
A TFT 50 is constructed at each intersection of Yj). T
The drains of the FT 50 are connected to data lines (Xi) for each column, and the gates of the FT 50 are connected to gate lines (Yj) for each row. 5
Reference numeral 1 designates transparent pixel electrodes, each connected to the source of a TFT 50, and a liquid crystal 53 is sandwiched between the transparent pixel electrode 51 and a transparent counter electrode 52.

FIG. 1 is a perspective view showing an embodiment of the present invention, 31
, 32, 33, and 34 are array substrates as explained in FIGS. 5 and 6. These array substrates 31, 32, 33.
34 can each independently configure one display device. This is weird. The first substrate 36 configured in this manner is opposed to a second substrate 40 having a transparent common electrode. And as shown in FIG. 2, the side substrate 36.40
It is constructed by sandwiching a liquid crystal 45 between them. Note that 46 is a spacer, and the distance between the substrates is set to about 10t1m.

The operation of this liquid crystal display device will be described as follows. The gate line (Yj) is sequentially scanned and driven by an address signal, and when Tf is a frame scanning period, the TFTs 50 are sequentially turned on for (Tf/n) periods for each row. On the other hand, in synchronization with the scanning of this gate line (Yj), the data line (
For example, m parallel pixel signals are supplied to Xi). As a result, the signal voltage is sequentially guided to the transparent pixel electrode 51 row by row, and the liquid crystal 53 sandwiched between the transparent counter electrode 52 is excited and an image is displayed.

In this case, the number m of data lines is m-pJI X 2 in the case of the above embodiment, where M is the number of data lines on one array substrate, and the number n of gate lines is the data on one array substrate. Letting the number of lines be N, it becomes n-NX2.

Therefore, according to this invention, the display screen can be easily enlarged. Furthermore, such a liquid crystal display device can be used in various ways. For example, the previous M
If and N are sufficient numbers to display one screen, it is easy to provide a drive circuit on each array substrate to obtain a multi-screen display. Furthermore, it can be easily applied to high-quality television signals with a large number of scanning lines.

[Effects of the Invention] As explained above, this invention allows the display area to be easily enlarged, there is no need to use special manufacturing equipment for increasing the size, and manufacturing safety is improved. It is possible to provide a matrix type liquid crystal display device that has high reliability and maintains reliability as a product.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the invention, Fig. 2 is a sectional view of the device of the invention, Fig. 3 is a diagram showing an example of an equivalent circuit of the device of the invention, and Fig. 4 is a matrix type liquid crystal display. 5 and 6 are an exploded perspective view and an assembled sectional view of a conventional liquid crystal display device, respectively. 31-34...Array substrate, 35...Transparent reinforcement substrate, 40...Second substrate, 45...Liquid crystal.

Claims (1)

[Claims] A semiconductor layer is provided between the drain and source electrodes at each intersection of a plurality of data lines provided on one surface of the insulating substrate and a plurality of gate lines perpendicular thereto, and the semiconductor layer and the A plurality of array substrates on which thin film transistors are arranged, each having a protective film that integrally covers and protects the drain and source electrodes, and a transparent substrate that abuts the other surface of the insulating substrate and arranges the plurality of array substrates on the same plane. A matrix type liquid crystal comprising a reinforcing substrate, a counter substrate having a transparent counter electrode formed on a surface opposite to a surface formed by the plurality of array substrates, and a liquid crystal sandwiched between the plurality of array substrates and the counter substrate. Display device.