JP2001331275A - Touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a touch panel from malfunctioning due to noise. SOLUTION: An upper transparent electrode 4 and a lower transparent electrode 6 are formed between a glass plate 8 and a film 2, and a spacer 5 is interposed between them so that a constant distance can be maintained. An upper ground transparent electrode 3 is formed between the upper transparent electrode 4 and the film 2, and a lower ground transparent electrode 7 is formed between the lower transparent electrode 6 and the glass plate 8. Also, thin insulating films (which are not shown in the figure) are respectively formed between the upper transparent electrode 4 and the upper ground transparent electrode 3 and between the lower transparent electrode 6 and the lower ground transparent electrode 7. The upper ground transparent electrode 3 and the lower ground transparent electrode 7 are respectively connected through conductors 10 and 11 of cables 9 to the GND of the device case body of a personal computer or the like. Moreover, the cables 9 to which the upper transparent electrode 4 and the lower transparent electrode 6 are connected are shielded by the conductors 10 and 11 so that this touch panel can be made valid to countermeasures against noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel, and more particularly, to a touch panel which is not affected by external noise and noise from a display device such as an LCD (liquid crystal display device).

[0002]

2. Description of the Related Art A touch panel has an upper transparent electrode and a lower transparent electrode arranged with a spacer interposed therebetween, and is grounded on the upper surface of an LCD or the like. FIG. 2 shows a notebook personal computer 20 provided with a touch panel 1. An LCD 21 is attached to a computer body provided with a keyboard via a hinge mechanism 24, and the touch panel 1 is provided on the LCD 21. The user presses an arbitrary position on the upper surface of the upper transparent electrode of the touch panel 1 with a finger, a stick, or the like to bring the upper transparent electrode into contact with the lower transparent electrode at that position, and electrically transmits information on the pressed position to the computer main body 23. Output to the internal circuit.

The touch panel 1 is provided at a position where external noise is received from the front surface and noise from the LCD 21 is received from the lower surface.

[0004]

Conventionally, noise reduction of the touch panel data line in the electronic circuit has been possible, but noise reduction of the touch panel itself was not possible. Sufficient measures have not been taken against noise received from LCDs and the like.

[0005]

A touch panel according to the present invention comprises a lower transparent electrode (6 in FIG. 1), an upper transparent electrode sandwiching a spacer (5 in FIG. 1) between the lower transparent electrode, and the lower transparent electrode. It includes a lower ground transparent electrode (7 in FIG. 1) provided below the transparent electrode, and an upper ground transparent electrode (3 in FIG. 1) provided above the upper transparent electrode. .

The touch panel according to the present invention comprises a transparent holding plate (8 in FIG. 1), a lower transparent electrode (6 in FIG. 1) provided above the transparent holding plate, and a spacer between the lower transparent electrode. An upper transparent electrode (4 in FIG. 1) sandwiching (5 in FIG. 1) and a film (2 in FIG. 1) provided on the upper side of the upper transparent electrode;
A lower ground transparent electrode (7 in FIG. 1) provided between the transparent holding plate and the lower transparent electrode, and an upper ground transparent electrode (FIG. 1) provided between the upper transparent electrode and the film. And 3) is included.

The touch panel according to the present invention comprises a transparent holding plate (8 in FIG. 1), a lower transparent electrode (6 in FIG. 1) provided above the transparent holding plate, and a spacer between the lower transparent electrode. An upper transparent electrode (4 in FIG. 1) sandwiching (5 in FIG. 1) and a film (2 in FIG. 1) provided on the upper side of the upper transparent electrode;
A lower ground transparent electrode (7 in FIG. 1) provided between the transparent holding plate and the lower transparent electrode, and an upper ground transparent electrode provided above the film.

The touch panel of the present invention comprises a lower transparent electrode (6 in FIG. 1), an upper transparent electrode (4 in FIG. 1) sandwiching a spacer (5 in FIG. 1) between the lower transparent electrode, and the lower transparent electrode (4 in FIG. 1). A lower grounded transparent electrode (7 in FIG. 1) provided below the transparent electrode;
An upper ground transparent electrode (3 in FIG. 1) provided above the upper transparent electrode, and a shield member (10, 1 in FIG. 1) connected to the lower ground transparent electrode and the upper ground electrode.
And a signal line (9 in FIG. 1) connected to the lower transparent electrode and the upper transparent electrode shielded by 1).

The touch panel of the present invention comprises a liquid crystal display device, a lower transparent electrode (6 in FIG. 1) provided above the liquid crystal display device, and a spacer (5 in FIG. 1) between the lower transparent electrode. An upper transparent electrode (4 in FIG. 1), a lower grounded transparent electrode (7 in FIG. 1) provided between the liquid crystal display device and the lower transparent electrode, and an upper transparent electrode provided above the upper transparent electrode. And an upper ground transparent electrode (3 in FIG. 1).

The touch panel of the present invention has a lower transparent electrode (6 in FIG. 1) and an upper transparent electrode (4 in FIG. 1) sandwiching a spacer (5 in FIG. 1) between the lower transparent electrode. The touch panel is characterized by including a ground electrode (3, 7 in FIG. 1) that covers the outer surface of the upper transparent electrode and the lower transparent electrode.

[0011]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view schematically showing a touch panel according to an embodiment of the present invention.

In FIG. 1, the touch panel has an upper transparent electrode 4 and a lower transparent electrode 6 between a glass plate 8 and a film 2, and a spacer 5 is interposed therebetween to keep a certain distance. The upper transparent electrode 4 and the lower transparent electrode 6 transmit touch position data to a CPU or the like of a personal computer via a cable 9.

An upper ground transparent electrode 3 is provided between the upper transparent electrode 4 and the film 2, and a lower ground transparent electrode 7 is provided between the lower transparent electrode 6 and the glass plate 8. A thin insulating layer (not shown) is provided between the upper transparent electrode 4 and the upper ground transparent electrode 3 and between the lower transparent electrode 6 and the lower ground transparent electrode 7, respectively. The upper ground transparent electrode 3 and the lower ground transparent electrode 7 are respectively connected to the conductors 10 and 11 of the cable.
Through the GND of a device housing such as a personal computer
(Ground part). Further, by shielding the cable 9 with the conductor 10 and the conductor 11, a touch panel effective for noise suppression can be obtained.

The upper transparent electrode 4 and the lower transparent electrode 6 are shielded by an upper grounded transparent electrode 3 and a lower grounded transparent electrode 7 which are grounded. During operation of the device, the touch panel receives external noise 12 from the upper surface and LCD noise 13 from the lower surface, but the touch position data is affected by the noise because the upper transparent electrode 4 and the lower transparent electrode 6 are shielded. There is no.

The upper grounded transparent electrode 3 is connected to the upper transparent electrode 4
It may be installed on the upper surface of the film 2 instead of between the film 2. In this case, when a finger or the like touching the touch panel is charged, the charge can be removed, which is an effective measure against static electricity.

[0017]

According to the touch panel of the present invention, since the upper grounded transparent electrode and the lower grounded transparent electrode are provided so as to cover the outer surfaces of the upper transparent electrode and the lower transparent electrode, external noise and noise from an LCD or the like are provided. Has the effect of eliminating the influence of

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a touch panel according to an embodiment of the present invention.

FIG. 2 is a perspective view of a notebook personal computer using a touch panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Touch panel 2 Film 3 Upper ground transparent electrode 4 Upper transparent electrode 5 Spacer 6 Lower transparent electrode 7 Lower ground transparent electrode 8 Glass plate 9 Cable 10 Conductor 11 Conductor 12 External noise 13 LCD noise 20 Personal computer 21 LCD 23 Computer main body 24 Hinge mechanism

Claims (6)

[Claims] 1. A lower transparent electrode, an upper transparent electrode sandwiching a spacer between the lower transparent electrode, a lower ground transparent electrode provided below the lower transparent electrode, and an upper side of the upper transparent electrode. And an upper ground transparent electrode provided on the touch panel. 2. A transparent holding plate, a lower transparent electrode provided above the transparent holding plate, an upper transparent electrode sandwiching a spacer between the lower transparent electrode, and an upper transparent electrode provided above the upper transparent electrode. Film, a lower ground transparent electrode provided between the transparent holding plate and the lower transparent electrode, and an upper ground transparent electrode provided between the upper transparent electrode and the film. Characteristic touch panel. 3. A transparent holding plate, a lower transparent electrode provided above the transparent holding plate, an upper transparent electrode sandwiching a spacer between the lower transparent electrode, and an upper transparent electrode provided above the upper transparent electrode. A touch panel comprising: a transparent film; a lower ground transparent electrode provided between the transparent holding plate and the lower transparent electrode; and an upper ground transparent electrode provided above the film. 4. A lower transparent electrode, an upper transparent electrode sandwiching a spacer between the lower transparent electrode, a lower ground transparent electrode provided below the lower transparent electrode, and an upper side of the upper transparent electrode. And a signal line connected to the lower transparent electrode and the upper transparent electrode which are shielded by a shield member connected to the lower ground transparent electrode and the upper ground electrode. Characteristic touch panel. 5. A liquid crystal display device, a lower transparent electrode provided above the liquid crystal display device, an upper transparent electrode sandwiching a spacer between the lower transparent electrode, the liquid crystal display device and the lower transparent electrode And a lower ground transparent electrode provided between the first and second transparent electrodes and an upper ground transparent electrode provided above the upper transparent electrode. 6. A touch panel having a lower transparent electrode and an upper transparent electrode sandwiching a spacer between the lower transparent electrode, the touch panel including a ground electrode covering an outer surface of the upper transparent electrode and the lower transparent electrode. A touch panel, characterized in that: