JPH05134805A - Display device with input device - Google Patents

Abstract

PURPOSE:To reduce the thickness of a display device by the thickness of a glass epoxy substrate or a paper phenol substrate and an IC by packaging the IC for drive or for input/output on the transparent substrate of an input device. CONSTITUTION:Transparent substrates 1 and driving circuits 2 and 3 are connected with chip-on-glass for directly connecting an IC chip on glass. Namely, the connection is made by using an anisotropic conductive film (ACF) to a pad formed so as to connect the electrodes of the transparent substrates 1 with the IC chip in face-down. The connection with input cables 4 and 5 for supplying signal to the driving circuits 2 and 3 is made by the ACF. These driving circuits are composed of shift registers. Thus, since the driving circuits 2 and 3 are provided on the two transparent substrates 1, it is not necessary to mount the glass epoxy or paper phenol substrate mounting the driving circuits for the input device on the down side of a liquid crystal display device 6, and the display device can be made thin by the thickness of the substrate in comparison with the conventional display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having an input device for performing an input operation on a display section.

[0002]

2. Description of the Related Art With the recent expansion of the market of information equipment and video equipment, a display device capable of input operation on a display portion is used, and a display device having a thin input device with high resolution is used. The demand for is increasing. Generally, so-called capacitive coupling method and electromagnetic induction method are used as a method of a high-resolution input device.

In the capacitive coupling method, a driving circuit sequentially applies scanning signals to a plurality of electrodes formed on two transparent substrates so as to be orthogonal to each other, and the timing of detecting the scanning signals with an input pen separately prepared. It is a method of the input device for specifying the position coordinates from.

The electromagnetic induction method is disclosed in, for example, Japanese Patent Laid-Open No. 2-162.
As disclosed in Japanese Unexamined Patent Publication No. 410-410, a plurality of loop coil-shaped electrodes formed so as to be orthogonal to each other on two transparent substrates are output circuits to sequentially generate signals to generate radio waves. This is received by an input pen having a separately prepared tuning circuit, and this time this input pen emits a similar radio wave, an induced voltage is generated in the loop coil electrode, and the coordinate detection means separately prepared through the input circuit. It is a method of an input device for specifying position coordinates.

A conventional structure of a display device having such an input device is, as shown in FIG. 3, two transparent substrates (c) 13
Conduction from each of the electrode terminals to the glass epoxy on which the drive circuit for the input device or the input / output circuit is mounted by the heat seal (x) 15 and the heat seal (y) 16 or the paper phenol substrate 14 is performed. It was a thing. Reference numeral 17 is an input cable to the drive circuit or an input / output cable to the input / output circuit.

[0006]

However, in the above-mentioned prior art, a display device having an input device corresponding to the thickness of the glass epoxy or paper phenol substrate, and the drive circuit mounted thereon or the IC which is the input / output circuit. Has a problem that it becomes thick.

Therefore, the present invention solves such a problem, and an object of the present invention is to provide a display device having an input device which can be made thin.

[0008]

A display device provided with an input device of the present invention is a driving circuit for giving signals to a plurality of electrodes formed on two transparent substrates sandwiching an insulating layer, or a signal to the electrodes. In a display device provided with an input device including an input / output circuit for receiving a signal after applying the drive signal, a drive circuit or an input / output circuit is provided on the two transparent substrates.

[0009]

Embodiments of the present invention will be described below with reference to capacitive coupling type and electromagnetic induction type examples.

(Embodiment 1) FIG. 1 is a diagram showing an embodiment of a liquid crystal display device having a capacity of 320.times.240 dots equipped with a capacitive coupling type input device of the present invention. Here, 1 is two transparent substrates (a) on which a plurality of electrodes which are orthogonal to each other are formed, each of which is attached to glass having a thickness of 1.1 mm. In this embodiment, the liquid crystal display device 1
One scanning electrode is formed for a display capacity of 0 dots. That is, 32 pieces x 2 on the transparent substrate (a) 1.
Four electrodes are formed. 2 is this transparent substrate (a)
Driving circuit (x) for applying a voltage to the upper substrate electrode of No. 1
And an input signal is given by the input cable (x) 4. Reference numeral 3 denotes a drive circuit (y) for applying a voltage to the lower substrate electrode of the transparent substrate (a) 1, to which an input signal is given by an input cable 5 (y). A display device 6 is a transparent substrate (a) by a double-sided tape 7.
1 is attached to the display device.

The transparent substrate (a) 1 was connected to the drive circuit (x) 2 and the drive circuit (y) 3 by chip-on-glass, which is an IC chip directly connected to glass. That is, the electrodes of the transparent substrate (a) 1 were connected to the IC chips by using ACF (anisotropic conductive film) to the pads formed so as to be connected face down. Further, the connection with the input cable (x) 4 and the input cable (y) 5 for supplying signals to the drive circuit (x) 2 and the drive circuit (y) 3 is ACF.
Done by. The drive circuit (x) 2 and the drive circuit (y) 3 are shift registers, the drive circuit (x) 2 is composed of 32 shift registers, and the drive circuit (y) 3 is composed of 24 shift registers. It is an IC. The input cable (x) 4 and the input cable (y) 5 are FPCs (flexible printed wiring boards) whose main material is polyimide, and are shaped so that they can be connected to the outside by soldering.

By providing the drive circuit on the two transparent substrates as described above, it is necessary to mount the glass epoxy or the paper phenol substrate on which the drive circuit for the input device is mounted on the lower side of the liquid crystal display device. As a result, it is possible to realize a liquid crystal display device having a significantly thinner input device than a liquid crystal display device having a conventional input device.

(Embodiment 2) FIG. 2 is a view showing an embodiment of a liquid crystal display device having a capacity of 320.times.240 dots equipped with an electromagnetic induction type input device of the present invention. Reference numeral 8 denotes two transparent substrates (b) on which a plurality of loop coil-shaped electrodes orthogonal to each other are formed, and 32 loop × 24 loop electrodes are formed as in the first embodiment. Reference numeral 9 gives a signal from the input / output cable (x) 11 to the upper substrate loop electrode of the transparent substrate (b) 8, receives a magnetic field from the outside, and outputs a signal to the input / output cable (x) 11. It is an input / output circuit (x) for Similarly, 10 also applies a signal from the input / output cable (y) 12 to the lower substrate loop electrode of the transparent substrate (b) 8 and receives a magnetic field from the outside to output a signal to the input / output cable (y) 12. Is an input / output circuit (y) for outputting A display device 6 has a transparent substrate (b) 8 attached to the display device by a double-sided tape 7.

The transparent substrate (b) 8 and the input / output circuit (x) 9 and the input / output circuit (y) 10 were connected by chip-on-glass, which is an IC chip directly connected to glass. That is, the electrodes of the transparent substrate (b) 8 were connected to the pads formed so that they could be connected face down with the IC chip using ACF. Further, the connection with the input / output cable (x) 11 and the input / output cable (y) 12 for inputting / outputting the signals of the input / output circuit (x) 9 and the input / output circuit (y) 10 was performed by the ACF. The input / output circuit (x) 9 and the input / output circuit (y) 10 have 32 channels and 2 channels, respectively.
I composed of 4-channel analog multiplexer
It is C. Further, the input / output cable 11 and the input / output cable (y) 12 are FPCs (flexible printed wiring boards) whose main material is polyimide as in the first embodiment, and have a shape that can be connected to the outside by soldering. And

By providing the input / output circuit on the two transparent substrates as described above, the glass epoxy or the paper phenol substrate on which the input / output circuit for the input device is mounted is mounted on the lower side of the liquid crystal display device. Since it is no longer necessary, a liquid crystal display device having a thinner input device than the conventional liquid crystal display device having an input device can be realized.

The above description has been made with reference to an example in which a liquid crystal display device is used as a display device.
It goes without saying that it can be realized even with a display device or a plasma display device.

[0017]

As described above, according to the display device provided with the input device of the present invention, the glass epoxy or paper phenol substrate attached to the lower side of the display device, and the drive circuit mounted thereon, or I, which is an input / output circuit
Since C is mounted on the transparent substrate, it is possible to reduce the thickness by the thickness of the transparent substrate. Therefore, it is possible to reduce the thickness of a device using a display device including an input device, such as a POS terminal. Have.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a display device including an input device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a display device including an input device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a structure of a display device including a conventional input device.

[Explanation of symbols]

1. Transparent substrate (a) 2. Drive circuit (x) 3. Drive circuit (y) 4. Input cable (x) 5. Input cable (y) 6. Liquid crystal display device 7. Double-sided tape 8. Transparent substrate (b) 9. Input / output circuit (x) 10. Input / output circuit (y) 11. Input / output cable (x) 12. Input / output cable (y) 13. Transparent substrate (c) 14. Glass epoxy or paper phenolic board with IC mounted 15. Heat seal (x) 16. Heat seal (y) 17. Input or input / output cable

Claims (1)

[Claims] 1. An input device comprising a drive circuit for applying signals to a plurality of electrodes formed on two transparent substrates sandwiching an insulating layer, or an input / output circuit for receiving signals after applying signals to the electrodes. A display device having an input device, characterized in that a drive circuit or an input / output circuit is provided on the two transparent substrates.