JP2000181626A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of being made thin and light in weight, also performing a touch operation and preventing the leakage of electromagnetic waves. SOLUTION: A front panel 16 attached to a display is provided with conductive mesh 16A where network lines 16a are parallelly arranged in one direction and conductive mesh 16B where network lines 16b are parallelly arranged in the direction perpendicularly to the lines 16a, the mesh 16A and the mesh 16B are separated in a required interval, the lines 16a and the lines 16b are mutually arranged in a freely contactable way with the bend of ones of them, a scan signal generation circuit 17 is connected to the mesh 16A, and a scan signal input circuit 18 detecting the contact positions of the lines 16a and the lines 16b is connected to the mesh 16B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device in which a touch panel is mounted on the front of a display to enable so-called touch input.

[0002]

In recent years, a touch panel has been attached to the surface of a display such as a plasma display panel (PDP), a CRT, and a liquid crystal panel.
A display device capable of performing various screen inputs by performing a so-called touch operation on the touch panel has been developed.

Here, a front panel for protecting a screen and preventing leakage of electromagnetic waves is generally attached to the front of such a display.
A front panel having an electromagnetic wave shielding effect for preventing I (electromagnetic interference) is attached.

For this reason, when a touch panel is attached to a display device with a conventional structure, a front panel 2 having an EMI shielding effect is arranged on the front surface of a display panel 1 like a PDP device shown in FIG. further,
It has a multilayer structure in which the touch panel 3 is arranged on the front surface of the front panel 2. Therefore, there arises a problem that the display device becomes structurally complicated and causes an obstacle to a reduction in thickness and weight.

[0005] Further, since the distance between the display surface of the display panel 1 and the touch surface of the touch panel 3 becomes large, a visual shift occurs between the position of the screen displayed on the display panel 1 and the touch position on the touch panel 3. This is likely to cause a so-called mistouch at the time of a touch operation.
Furthermore, the increase in the number of components arranged on the front surface of the display panel 1 causes a problem that the light transmittance is reduced and the screen becomes darker, and the screen becomes more susceptible to external light reflection.

The present invention has been made to solve the conventional problems when a touch panel is attached to a display device as described above. That is, the present invention can achieve a reduction in thickness and weight,
It is an object of the present invention to provide a display device capable of preventing touch operation and leakage of electromagnetic waves.

[0007]

According to a first aspect of the present invention, there is provided a display device having a front panel in front of a display surface of a display, wherein the front panel has a conductive layer and a conductive layer. A coordinate position detecting means for detecting a coordinate position of an action point of the pressing force applied to the outer surface of the front panel.

In the display device according to the first aspect of the invention, the front panel, which is disposed in front of the display surface of the display and protects the display surface of the display, blocks leakage of electromagnetic waves generated from the display by the conductive layer. Further, when the outer surface of the front panel is pressed by an external force, the coordinate position detecting means detects the coordinate position of the point of action of the pressing force.

As described above, according to the first aspect,
The front panel, which protects the display surface of the display, has a touch panel function for performing touch operations and an electromagnetic wave leakage prevention function, eliminating the need to attach the front panel and touch panel separately as in the past. In addition, it is possible to reduce the thickness and weight of the display device, and thereby it is possible to prevent erroneous touch at the time of a touch operation, a decrease in light transmittance, and an influence of external light reflection.

According to a second aspect of the present invention, in order to achieve the above object, in addition to the configuration of the first aspect,
The conductive layer is made of a conductive mesh member.

[0011] In the display device according to the second aspect of the present invention, the leakage of the electromagnetic wave generated from the display is prevented by the conductive layer constituted by the conductive mesh member.

According to a third aspect of the present invention, there is provided a display apparatus according to the first aspect, further comprising:
The coordinate position detecting means comprises: a first conductive mesh member in which conductive wires are arranged in parallel in one direction; and a conductive wire in a direction orthogonal to the conductive wires of the first conductive mesh member. A second conductive mesh member arranged in parallel, wherein the first conductive mesh member and the second conductive mesh member are spaced apart from each other by a predetermined distance, and the conductive wires of each other are bent by one of the curves. The first conductive mesh member is disposed so as to be freely contactable with each other at the position,
Scan signal generating means for outputting a scan signal is connected to each conductive wire, and the second conductive mesh member is brought into conduction by contact with the conductive wire of the first conductive mesh member from the conductive wire. Scan signal input means for detecting the coordinate positions of the conductive wires of the first conductive mesh member and the second conductive mesh member that have come into contact with each other when the scan signal is input is connected.

[0013] In the display device according to the third aspect of the invention, the conductive layer is formed by the first conductive mesh member and the second conductive mesh member constituting the front panel, which are arranged so as to be orthogonal to each other. The leakage of the electromagnetic wave is prevented by the conductive layer.

[0014] When the outer surface of the front panel is pressed by an external force, the conductive wire of one conductive mesh member located at the point of action of the pressing force opposes due to the curvature of the conductive mesh member. In contact with the other conductive wire.

Thus, the scan signal output from the scan signal generating means to the conductive wire of the first conductive mesh member is conducted to the conductive wire of the second conductive mesh member which is in contact with the scan signal input means. Is input to

The scan signal input means includes a conductive signal of the second conductive mesh member connected to the scan signal input means from which the scan signal is input, and a touch signal to be input is the scan signal generating means. Then, the touch position on the front panel is detected by detecting which conductive line of the second conductive mesh member has been output from.

As described above, according to the third aspect,
Since the front panel that protects the display surface of the display has the function of a touch panel for performing touch operations and the function of preventing leakage of electromagnetic waves, there is no need to attach the front panel and the touch panel as in the past,
As a result, the display device can be made thinner and lighter, and thereby, it is possible to prevent erroneous touch at the time of a touch operation, a decrease in light transmittance, and an influence of external light reflection.

According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the display device according to the third aspect of the invention has the following structure.
The front panel includes the first conductive mesh member and a second conductive mesh member.
The display device is characterized in that one of the conductive mesh members is attached to the display in a state of being in contact with the display surface of the display.

In the display device according to the fourth aspect, one of the first conductive mesh member and the second conductive mesh member constituting the front panel is in contact with the display surface of the display.

[0020] Thus, the distance between the outer surface of the front panel and the display surface of the display can be shortened, whereby the thickness of the device can be reduced. In this case, mistouch can be prevented.

According to a fifth aspect of the present invention, in order to achieve the above object, in addition to the configuration of the first aspect,
The front panel is formed by forming a conductive layer on a touch panel.

In the display device according to the fifth aspect of the present invention, the touch panel for performing a touch operation protects the display surface of the display and functions as a front panel having a function of preventing leakage of electromagnetic waves.

This eliminates the necessity of separately attaching the front panel and the touch panel as in the related art.
It is possible to reduce the thickness and weight of the display device, and it is possible to prevent erroneous touch at the time of a touch operation, a decrease in light transmittance, and an influence of external light reflection.

According to a sixth aspect of the present invention, there is provided a display device according to the first aspect, further comprising:
The display is a plasma display panel.

The display device according to the sixth aspect of the present invention is a plasma display device particularly required to be thin.
In a panel device, the thickness of the display can be further reduced, and the plasma display panel can be used as a touch-operable computer display.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of an embodiment in which a display device according to the present invention is applied to a PDP device. In FIG. 1, a front case 10A
PDP case 1 composed of a rear case 10B
0, the display panel 1 supported by the frame 11
2 are attached via the side frame 13, the elastic body 14, and the side attachment frame 15, and the display surface 12A
Are opposed to the front opening 10Aa of the front case 10A. The front panel 16 is provided inside the front opening 10Aa of the front case 10A.
Is mounted so as to maintain a parallel state with respect to the display surface 12A.

As shown in FIGS. 2 and 3, the front panel 16 has a conductive mesh 16A in which conductive braids 16a are arranged in a horizontal direction and a braided wire 16b in a vertical direction. And a conductive mesh 16B. The conductive mesh 16A and the conductive mesh 16B are slightly separated from each other and the braided wire 16a
And the braided wire 16b are arranged parallel to each other so as to be orthogonal to each other, and the conductive mesh 16B is attached to the display panel 12 in contact therewith.

An output terminal 17a of a scan signal generation circuit 17 is connected to each of the knitted wires 16a of the conductive mesh 16A, and a scan signal is pulse-output from the scan signal generation circuit 17 to each of the knitted wires 16a. It has become. An input terminal 18a of a scan signal input circuit 18 is connected to each of the knitted wires 16b of the conductive mesh 16B. Is entered.

The front panel 16 is provided with an EMI shielding function for preventing leakage of electromagnetic waves by two conductive meshes 16A and 16B. When the front panel 16 is pressed from the front side, that is, from the outer surface side of the conductive mesh 16A, the pressed portion of the conductive mesh 16A (for example, FIG. X point) is concave and the knitted line 16a
Is in contact with the knitted wire 16b of the conductive mesh 16B located at a position facing the knitted wire 16a.

Thus, the scan signal generation circuit 17
The scan signal that is output as a pulse to the knitting line 16a is conducted to the knitting line 16b and is input to the scan signal input circuit 18.

The scan signal input circuit 18 determines from which of the knitted lines 16b connected to the scan signal input circuit 18 a scan signal is input, and
The touch position of the front panel 16 is detected by detecting to which knitting line 16a the input scan signal is output from the scan signal generation circuit 17.

In the above example, the front panel 16 is made of two conductive meshes, so that
A metal reflective layer or a conductive mesh layer is provided on the front panel which is provided on the front of the display panel 12 of the PDP and protects the display panel 12 from damage and adhesion of dirt. The EMI shielding function and the touch position detection function are provided on the front panel by forming and detecting the touch position on the front panel by providing an ultrasonic or optical coordinate position detection circuit. It may be provided.

In the above description, the present invention relates to a PDP.
Although the case where the present invention is applied to a device has been described as an example, the present invention can be applied to a display device of a type other than a PDP such as a CRT or a liquid crystal panel.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a display panel and a front panel of the PDP in the same example.

FIG. 3 is a circuit diagram showing a configuration of a conductive mesh of a front panel in the same example.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

12 display panel 12A display surface 16 front panel 16A conductive mesh (first conductive mesh member) 16a braided wire 16a (conductive wire) 16B conductive mesh (second conductive mesh member) 16b Knitted wire 16b (conductive wire material) 17 Scan signal generating circuit (scan signal generating means) 18 Scan signal input circuit (scan signal input means)

Claims (6)

[Claims] 1. A display device having a front panel in front of a display surface of a display, wherein the front panel has a conductive layer and a coordinate position for detecting a coordinate position of an action point of a pressing force applied to an outer surface of the front panel. A display device, comprising a detection unit. 2. The display device according to claim 1, wherein the conductive layer is formed of a conductive mesh member. 3. The coordinate position detecting means includes: a first conductive mesh member having conductive wires arranged in parallel in one direction; and a direction orthogonal to the conductive wires of the first conductive mesh member. A second conductive mesh member in which conductive wires are arranged in parallel with each other, wherein the first conductive mesh member and the second conductive mesh member are spaced apart from each other by a predetermined distance and one of the conductive wires is The first conductive mesh member is connected to a scan signal generating unit that outputs a scan signal to each conductive wire, and the second conductive mesh member is connected to the first conductive mesh member. A first conductive mesh member and a second conductive mesh that come into contact with each other by inputting a scan signal that is made conductive by the contact of the first conductive mesh member with the conductive wire from the conductive wire are input. 2. The display device according to claim 1, wherein scan signal input means for detecting a coordinate position of the conductive wire of the screen member is connected. 4. The front panel according to claim 3, wherein the front panel is attached to the display with one of the first conductive mesh member and the second conductive mesh member being in contact with a display surface of the display. Display device. 5. The display device according to claim 1, wherein the front panel is formed by forming a conductive layer on a touch panel. 6. The display device according to claim 1, wherein the display is a plasma display panel.