KR200239160Y1 - Touch screen capable of isolating noise signals - Google Patents

Abstract

A touch screen capable of separating noise signals is a touch screen installed in front of an LCD screen or a CRT to remove electromagnetic waves and radio frequency interference received by a liquid crystal display (LCD) and a cathode ray tube (CRT). The touch screen includes an antenna such as a conductive wire capable of receiving the same noise signal mixed with the touch control signal. The touch screen controller uses the noise signal received by the antenna wire to offset the noise signal of the controller to increase the accuracy of the touch screen.

Description

TOUCH SCREEN CAPABLE OF ISOLATING NOISE SIGNALS}

The present invention relates to a touch screen capable of removing a noise signal, and in particular, to a back light source of a cathode ray tube (CRT) or a liquid crystal display (LCD) screen, or other external electromagnetic interference (EMI) and radio frequency interference (RFI). The present invention relates to a touch screen capable of removing a noise signal generated by the same.

Currently, touch screens in the form of voltage sensing and touch screens in the form of current sensing are widely used in desktop computers, portable computers or notebook computers. The user can record on the screen, draw pictures or select various functions or press command keys to generate electrical signals and input them to the computer to execute the desired process, without having to operate the computer via the keyboard.

The touch screen (shown in FIG. 1 for a conventional current sensing touch screen) is usually a glass layer 1, a conductive thin film layer 2, a linearization pattern layer 3, an insulating layer 4, four wires Is a printing layer 5, and a tail cable 6 connecting to the controller. The controller outputs four identical voltages at the four ends of the linearization pattern of the touch screen to measure the current change.

When different points of the touch screen are touched, the current at the four ends will have different changes. By measuring the current change, the controller can determine the touched position. Detailed operating principles can be found in US Patent Application No. 4,293,734. In actual operation, the touch screen may absorb ambient noise signals with four currents, making the touch screen unable to respond exactly to the touched position.

Glass layer 10, indium tin oxide conductive layer (ITO) 11, a set of insulating points 12, insulating layer 13, a four-wire silver printing layer 14, another insulating layer 15, Another type of touch screen including another ITO conductive layer 16, a plastic thin film layer 17, and a tail cable 18 connecting to the controller (shown in FIG. 2, with five wires in the form of conventional voltage sensing) Touch screen). In principle of operation, the underlying ITO layer is connected to a uniform electric field of 0-5V in the X-axis direction. When the touch screen is touched, the upper ITO layer contacts the lower ITO layer and measures the voltage value. The ratio of the voltage values represents the position ratio in the direction (X axis) on the touch screen. For example, 3V indicates that the touch point is located at 60% of the full length of the touch screen in the X-axis direction. When the measurement in one direction (ie X axis) is complete, the controller panel changes the upper ITO layer to a uniform electric field of 0-5V in the Y axis direction and then uses the lower ITO layer to Measure the voltage value of the touch point and measure the position in the other direction (Y-axis). Reference details can be found in US Patent Application No. 3,622,105. In actual operation, the touch screen may absorb ambient noise signals at the measured voltages, making the touch screen unable to respond accurately to the touched position.

Glass layer 20, ITO conductive layer 21, linearization pattern layer 29, a set of insulating points 22, insulating layer 23, a four-wire silver printing layer 24, and another insulating layer ( 25, another form of touch screen (shown in FIG. 3, including another ITO conductive layer 26, a plastic thin film layer 27, and a tail cable 28 connecting to a controller). Touch screen with dog wire). In principle of operation, the lower ITO layer is connected to a uniform electric field of 0-5V in the X-axis direction. When the touch screen is touched, the upper ITO layer contacts the lower ITO layer and measures the voltage value. The ratio of the voltage values indicates the position ratio in the X-axis direction on the touch screen. For example, 3V indicates that the touch point is located at 60% of the total length of the touch screen in the X axis direction. When the measurement in one direction (ie X axis) is complete, the controller switches the lower ITO to a uniform electric field of 0-5V in the Y axis direction and then uses the lower ITO layer to Measure the voltage value, and measure the position in the other direction (Y axis). Reference details can be found in US Patent Application No. 3,798,370. In actual operation, the touch screen may absorb ambient noise signals at the measured voltages, making the touch screen unable to respond accurately to the touched position.

Although the conventional touch screen described above allows a user to operate the computer without pressing a button key on the keyboard, there are still many drawbacks in use. This may cause the touch screen to be easily affected by interference due to LCD or CRT back light sources, or external EMI and RFI, resulting in inaccurate sensing positions and errors in computer judgment or recognition. For example, drawing a straight line on the touch screen may be curved when displaying on the screen, and selecting the A key on the keyboard map displayed on the screen may result in displaying the B key on the screen.

It is an object of the present invention to overcome this drawback by adding a conductive wire such as an antenna on the touch screen. The conductive wire will receive the same signal as is present in the touch screen, and the controller will cancel the noise signal in the touch control signal to remove the noise signal in the control signal using the noise signal in the conductive wire, thus The desired accuracy will be achieved.

1 is a schematic exploded view showing a touch screen of the conventional current sensing type.

2 is a schematic exploded view showing a conventional touch screen in the form of a voltage sensing with four wires.

3 is a schematic exploded view showing a conventional touch screen in the form of a voltage sensing with five wires.

4 is a schematic exploded view showing a touch screen of the first current sensing form of the present invention.

5 is a schematic exploded view illustrating a touch screen of the second current sensing form of the present invention.

6 is a schematic exploded view showing a touch screen in the form of a voltage sensing with a first five wires according to the present invention;

7 is a schematic exploded view showing a touch screen in the form of a voltage sensing with a second five wires according to the present invention;

8 is a schematic exploded view showing a touch screen in the form of a voltage sensing having a first six wires according to the present invention;

7 is a schematic exploded view showing a touch screen in the form of a voltage sensing with a second six wire in accordance with the present invention;

※ Explanation of code for main part of drawing

1. Glass layer 2. Conductive thin film layer

3. Linearization pattern layer 4. Insulation layer

5. Silver printing layer of 5 wires 6. Antenna wire

7. Tail cable

Referring to FIG. 4 for a first current sensing type touch screen of the present invention, the printing includes an additional conductive wire 6 on a conventional current sensing type touch screen. The conductive wire 6 has one end floating like an antenna. The other end of the conductive wire 6 is connected to the controller of the touch screen. The antenna wire receives the same noise signal as the noise signal received by the touch screen. The controller then uses the noise signal received from the antenna wire to offset the noise signal in the touch control signal, thereby causing the current sensing touch screen to be a current sensing touch screen with an offset noise signal.

The touch screen described above includes a glass layer 1, a conductive thin film layer (ITO) 2, a linearization pattern layer 3, an insulating layer 4, a silver printing layer 5 of five wires, and a tail connecting to the control panel. Cable 7. The silver printing of the five wires is connected to the controller of the touch screen with one end passing through the tail cable 7 and the other end of the four silver printing wires is connected to the four ends of the linearization pattern. The fifth conductive wire has another end that floats as an antenna wire printed on the insulating layer with a conductive wire in a linearized pattern. Therefore, no additional manufacturing cost is incurred.

The conductive thin film layer 2 may be indium tin oxide (ITO).

The linearization pattern 3 is printed around the conductive thin film layer 2 described above.

The insulating layer 4 is printed on the conductive thin film layer 2.

The silver printing layer 5 and antenna wire 6 of the four wires are printed on the insulating layer 4.

The antenna wire 6 is located inside or outside the silver printing layer 5 of four wires having one end extending to offset the external noise signal of the touch screen so that the controller can use this noise signal to interfere on the touch screen. To offset.

The tail cable 7 is a transmission line made of a thin film for connecting to the silver printing layer of four wires and the connection ends 5a and 6a of the antenna wire 6 to output the electric signal generated by the touch screen, As a result, a five-wire current sensing type touch screen can be formed.

When the above-described current sensing type touch screen is coupled to a portable computer, a notebook computer or a desktop computer for use, the antenna wire 6 is connected to a back light source of an LCD or CRT, or a noise signal generated by an external EMI or RFI. Will allow the controller to eliminate interference of the same noise signal, so that the user can record, draw or select various functions on the touch screen with the interference of the external noise signal reduced. Therefore, when the user records and draws, the distortion is less likely to occur, such as changing a straight line into a curve, and the selected position is correctly identified so that the computer cannot judge and recognize it incorrectly due to the outputted electric signal.

Referring to FIG. 5 for a second current sensing type touch screen of the present invention, the present invention includes printing an additional conductive wire 6 on the backside of the glass layer 10 of a conventional current sensing type touch screen. do. Since the conductive wire 6 has the same function as that described in FIG. 4, the current sensing touch screen can be a current sensing touch screen with an offset noise signal.

The touch screen described above includes a glass layer 1, a conductive thin film layer (ITO) 2, a linearization pattern layer 3, an insulation layer 4, a silver printing layer 5 of four wires, an antenna wire 6 and A tail cable 7. The touch screen uses the same technique as described in FIG. The difference is that the antenna wire 6 is printed around the other side of the glass layer 1. The antenna wire 6 also has the function of offsetting the noise signal from the touch screen described in FIG.

The conductive thin film layer 2 may be made of indium tin oxide (ITO).

The linearization pattern layer 3 is printed around the conductive thin film layer 2 described above.

The insulating layer 4 is printed on the conductive thin film layer 2 described above.

The silver printing layer 5 of four wires is printed on the insulating layer 4.

The antenna wire 6 is printed on the back side of the glass layer 1 and has one end extended to offset external noise of the touch screen so that the controller uses this noise signal to offset the interference on the touch screen.

The tail cable 7 is a transmission line made of thin film so as to connect the silver printing layer of four wires and the other ends of the connection ends 5a and 6a of the antenna wire 6 to the output electric signal generated by the touch screen. As a result, a five-wire current sensing type touch screen may be formed.

Referring to FIG. 6 for a touch screen of the first five wire voltage sensing type of the present invention, an additional conductive wire 19 is printed on a conventional four wire voltage sensing type touch screen. The conductive wire 19 has one end floating like an antenna. The other end of the antenna wire is connected to the controller of the touch screen. The antenna wire will receive the same noise signal that the touch screen receives. The controller uses the received noise signal to offset the noise signal of the touch control signal, whereby the 4-wire voltage sensing type touch screen can be a 5-wire voltage sensing type touch screen with an offset noise signal. have.

The touch screen described above includes a glass layer 10, a first conductive thin film layer 11, an insulating point layer 12, a first insulating layer 13, a silver printing layer 14 of five wires, and a second insulating layer. 15, the second conductive thin film layer 16, the thin film layer 17, and the tail cable 18. Silver printing of five wires has one end through the tail cable 18. The silver printing of the five wires has the other end through the tail cable 18 and is connected to the controller of the touch screen. The four silver printing wires have different ends connected to the two ends of the upper and lower conductive layers 11 and 16, respectively. The fifth wire has another end that floats to be a conductive wire 19 that can be printed on the insulating layer with a conductive wire in a linearized pattern without incurring additional costs.

The fifth silver printing wire 19 is added to the structure of the conventional four wires for detecting the noise signal. The controller uses the detected noise signal to offset the noise signal of the touch screen.

The first conductive thin film layer 11 may be made of indium tin oxide (ITO).

The insulation point layer 12 is printed or attached to the first conductive thin film layer 11.

The first insulating layer 13 is printed around the insulating point layer 12.

A silver printing layer 14 of five wires is formed by printing five wires to connect a set of controller wires to the first insulating layer 13.

The second conductive thin film layer 16 may be made of ITO.

The thin film layer 17 is a transparent film.

The tail cable 18 is a transmission line made in thin film so as to connect to the silver printing layer 14 of five wires and the connector ends 14a and 19a of the conductive wire 19 for the output electrical signal generated by the touch screen. .

When the touch screen described above is coupled to a portable computer, notebook computer or desktop computer for use, the conductive wire 19 on the screen may offset the noise signal generated by the back light source of the LCD or CRT, or external EMI or RFI. This allows the user to record on the touch screen, draw pictures or select various functions without the interference of noise signals, such as converting straight lines into curves, and the computer can be misused due to the outputted electrical signal with the correct selection position. You will not judge and recognize it.

Referring to FIG. 7 of the touch screen of the second five-wire voltage sensing form of the present invention, the voltage sensing form of the conventional four wires to be a touch screen of the five-wire voltage sensing form having an offset noise signal. Printing an additional conductive wire 19 on the back of the touch screen of the touch screen.

The touch screen described above includes a glass layer 10, a first conductive thin film layer 11, an insulation point layer 12, a first insulation layer 13, a four-wire silver printing layer 14, and a second insulation. Layer 15, conductive wire 19, thin film layer 17, second conductive thin film layer 16, and tail cable 18. The conductive wire 19 is added to the structure of the conventional four wires to detect the noise signal. The controller uses the detected noise signal to offset the noise signal of the touch screen.

The conductive wire 19 is printed on the back side of the glass layer 10 to connect the fifth wire of the tail cable.

The first conductive thin film layer 11 may be made of indium tin oxide (ITO).

The insulation point layer 12 is printed or attached to the first conductive thin film layer 11.

The first insulating layer 13 is printed around the insulating point layer 12.

A silver printing layer 14 of five wires is formed by printing five wires to connect a set of controller wires to the first insulating layer 13. The wire set has a connecting end 14a located at one end for outputting a signal.

The thin film layer 17 is a transparent film.

The second conductive thin film layer 16 may be made of ITO.

The tail cable 18 is a transmission line made in thin film so as to connect the silver printing layer 14 of five wires and the connection ends 14a and 19a of the conductive wire 19 to the output electrical signal generated by the touch screen. .

Thus, the manufactured touch screen becomes another five wire type touch screen with an offset noise signal.

When the aforementioned touch screen is coupled to a portable computer, notebook computer or desktop computer for use, the conductive wire 19 on the screen may offset the noise signal generated by the back light source of the LCD or CRT, or external EMI or RFI. This allows the user to record on the touch screen, draw pictures or select various functions without interference of noise signals, such as converting straight lines into curves, and by selecting the correct position and outputting the electric signal Misjudge and not be recognized.

Referring to FIG. 8 with respect to the touch screen of the first six wires voltage sensing form of the present invention, the additional conductive wire 30 includes printing the touch screen of the conventional five wires voltage sensing type. The antenna wire 30 allows a five wire voltage sensing type touch screen to be a six wire voltage sensing type with an offset noise signal.

The touch screen described above includes a glass layer 20, a first conductive thin film layer 21, an insulation point layer 22, a first insulation layer 23, a linearization pattern layer 29, and a silver printing layer of five wires. 24, the second insulating layer 25, the second conductive thin film layer 26, the thin film layer 27, and the tail cable 28. The conductive wire (sixth wire, 30) is added to the structure of the conventional five wires to detect the noise signal. The controller uses the detected noise signal to offset the noise signal of the touch screen.

The first conductive thin film layer 21 may be made of indium tin oxide (ITO).

The insulating point layer 22 is printed or attached to the first conductive thin film layer 21.

The first insulating layer 23 is printed around the insulating point layer 22.

A silver printing layer 24 of five wires is formed by printing six wires to connect a set of controller wires to the first insulating layer 23. The wire set has a connecting end 24a located at one end for outputting a signal.

The thin film layer 27 is a transparent film.

The second conductive thin film layer 26 may be made of ITO.

The tail cable 28 is a transmission line made in a thin film form so as to be connected to the connection terminals 24a and 30a to output an electrical signal generated by the touch screen.

Thus, the fabricated touch screen becomes a six wire touch screen with an offset noise signal.

When the touch screen described above is coupled to a portable computer, notebook computer or desktop computer for use, the conductive wire 30 on the screen may offset the noise signal generated by the back light source of the LCD or CRT, or external EMI or RFI. The user can record on the touch screen, draw a picture or select various functions without interference of noise signal such as converting a straight line into a curve, and the selected position is accurately confirmed and the output electrical signal causes the computer to Misjudge and not be recognized.

Referring to FIG. 9 for the touch screen of the second six wire voltage sensing type of the present invention, the printing includes an additional conductive wire 30 printed on the rear surface of the glass layer of the conventional five wire voltage sensing type. . The conductive wire 30 causes the 5-wire voltage sensing type touch screen to be a 6 wire voltage sensing type screen having an offset noise signal.

The touch screen described above includes a glass layer 20, a conductive wire 30, a first conductive thin film layer 21, an insulation point layer 22, a first insulation layer 23, a linearization pattern layer 29, and 5. The silver printing layer 24 of the two wires, the second conductive thin film layer 26, the thin film layer 27, and the tail cable 28. The conductive wire (sixth wire, 30) is added to the structure of the conventional five wires to detect the noise signal. The controller uses the detected noise signal to offset the noise signal of the touch screen.

The conductive wire 30 is printed on the back side of the glass layer 20 to connect to the sixth wire of the tail cable 28.

The first conductive thin film layer 21 may be made of indium tin oxide (ITO).

The insulating point layer 22 is printed or attached to the first conductive thin film layer 21.

The first insulating layer 23 is printed around the insulating point layer 22.

A silver printing layer 24 of five wires is formed by printing five wires to connect a set of controller wires to the first insulating layer 23.

The thin film layer 27 is a transparent film.

The second conductive thin film layer 26 may be made of ITO.

The tail cable 28 is a thin film transmission line connected to the silver printing layer 24 of the five wires and the connection ends 24a and 30a of the conductive wire 30 to output the electric signal generated by the touch screen. to be.

Thus, the fabricated touch screen becomes a six wire touch screen with an offset noise signal.

When the touch screen described above is coupled to a portable computer, notebook computer or desktop computer for use, the conductive wire 30 on the screen will offset the noise signal generated by the back light source of the LCD or CRT, or external EMI or RFI. This allows the user to record on the touch screen, draw pictures or select various functions without interference of noise signals such as converting straight lines into curves, and the selected position is accurately identified and the output electrical signal causes the computer to Misjudge and not be recognized.

As described above, when coupled to a portable computer, notebook computer or desktop computer for use in the provision of a touch screen according to the present invention, the antenna wire 6 is connected by a back light source of an LCD or CRT, or by an external EMI or RFI. It will receive the generated noise signal, thereby allowing the controller to eliminate the interference of the same noise signal, so that the user can record on the touch screen, draw pictures or select various functions with the interference of the external noise signal reduced. Can be. Therefore, when the user records and draws, the distortion is less likely to occur, such as changing a straight line into a curve, and the selected position is correctly identified so that the computer cannot judge and recognize it incorrectly due to the outputted electric signal.

Claims (4)

In the current sensing type touch screen including a glass layer, a conductive thin film layer, a linearization pattern layer, an insulating layer, a silver printing layer of five wires, and a tail cable, Four conductive wires are connected to the four ends of the linearization pattern layer, the other four ends are connected to the controller, the fifth conductive wire is floating at one end and the other end to the controller, The fifth conductive wire with one end floating can detect a noise signal affecting the controller, and the controller removes the interference caused by the noise signal of the controller using the noise signal detected by the fifth wire. Thereby forming a 5-wire current sensing touch screen with an offset noise signal, The conductive wire has a connecting end, And the conductive wire is printed on the other side of the glass layer. The method of claim 1, And the conductive wire is printed as a rectangular border line. 5 wires capable of removing noise signals, including a glass layer, a first conductive thin film layer, an insulating point layer, a first insulating layer, a silver printing layer of five wires, a second insulating layer, a second conductive thin film layer and a thin film layer In the touch screen of the voltage sensing form of, Four conductive wires are connected to the four ends of the linearization pattern layer, the other four ends are connected to the controller, the fifth conductive wire is floating at one end and the other end to the controller, The fifth conductive wire with one end floating can detect a noise signal affecting the controller, and the controller removes the interference caused by the noise signal of the controller using the noise signal detected by the fifth wire. Thereby forming a 5-wire voltage sensing type touch screen with an offset noise signal, The conductive wire has a connecting end, The conductive wire is printed on the other side of the glass layer, And the conductive wire is printed as a rectangular border line. Noise signal, including a glass layer, a first conductive thin film layer, a linearization pattern layer, an insulating point layer, a first insulating layer, a silver printing layer of five wires, a second insulating layer, a second conductive thin film layer and a thin film layer, can be removed. In the six-wire touch-sensitive touch screen, Four conductive wires are connected to the four ends of the linearization pattern layer, the other four ends are connected to the controller, the sixth conductive wire is floating at one end and the other end to the controller, The sixth conductive wire with one end floating can detect the noise signal affecting the controller, and the controller uses the noise signal detected by the sixth wire to remove the interference caused by the noise signal of the controller. Thereby forming a six-wire voltage sensing type touch screen with an offset noise signal, The conductive wire has a connecting end, The conductive wire is printed on the other side of the glass layer, And the conductive wire is printed as a rectangular border line.