TWI465997B - Touch panel - Google Patents

Description

Touch panel

The present invention relates to a touch panel, and more particularly to a touch panel capable of increasing a signal noise ratio.

In order to make people enjoy a more convenient life, many technologies are gradually developing in a convenient direction, and for input devices for controlling electronic devices, they have also evolved into touchable devices by input devices with input keys. The touch panel controlled by the panel mode makes it easier for the user to operate the electronic device.

Furthermore, in recent years, various electronic products have been moving toward simple operation, small size, and large screen size. In particular, portable electronic products have stricter requirements on volume and screen size. Therefore, many electronic products integrate the touch panel with the liquid crystal display panel to omit the space required for the keyboard or the control buttons, thereby expanding the configurable area of the screen.

Currently, touch panels can be roughly classified into resistive, capacitive, infrared, and ultrasonic touch panels. Among them, resistive touch panels and capacitive touch panels are the most common products. Furthermore, with the development of tablet computers and smart phones, the application of multi-finger discriminating detection is becoming more and more popular, and in the use of sensing components, most of them are capacitive sensors, among which common sensing The components are as shown in the first figure, which is a schematic diagram of a conventional gate capacitance sensor. As shown, a conventional gate capacitance sensor includes a plurality of receiving electrodes 10' and a plurality of transmitting electrodes 20'. The receiving electrodes 10' are located in a first layer, and the receiving electrodes 10' are mutually Electrically insulated, the transmitting electrodes 20 ′ are located in a second layer, and the transmitting electrodes 20 ′ are electrically insulated from each other, and the receiving electrodes 10 ′ are coupled to a receiving circuit for making the receiving through the touch of the human finger. A change in charge coupling occurs between the electrode 10' and the emitter electrode 20', such that the receiving electrode 10' receives the scan signal transmitted by the emitter electrode 20' to obtain a touch position.

However, the above-mentioned prior art is limited to the general use environment. If the grid capacitive sensor is placed under a noise source, such as a liquid crystal display module, the receiving electrodes 10' and the transmitting electrodes are The 20' is coupled to a capacitance detecting circuit to cause a change in the charge coupling between the receiving electrodes 10' and the transmitting electrodes 20' through the touch of the human finger to generate a change in the equivalent capacitance, but The noise source also causes a change in charge coupling, which in turn affects the detection of capacitance.

Therefore, how to solve the above problem is to provide a novel touch panel, which increases the signal noise ratio by coupling a plurality of impedance elements between the plurality of transmitting electrodes, thereby improving the accuracy of finger touch position detection, so that the solution can be solved. The above problem.

One of the objectives of the present invention is to provide a touch panel that increases the signal noise ratio by coupling a plurality of impedance elements between the plurality of emitter electrodes, thereby improving the accuracy of finger touch position detection.

One of the objectives of the present invention is to provide a touch panel that is configured by interpolating a plurality of transmitting electrodes and a plurality of impedance elements to increase a transmitting electrode under a driving voltage circuit for detecting a fixed capacitance, thereby increasing a touch position thereof. Detection range.

The touch panel of the present invention comprises a plurality of receiving electrodes, a plurality of transmitting electrodes, a plurality of first impedance elements and a plurality of emitting sources. The transmitting electrodes are parallel and orthogonal to the receiving The first impedance element is coupled between the emitter electrodes; and the emitters are respectively coupled to the emitter electrodes and the first impedance elements to emit a scan signal and sequentially transmit the scan signal to The transmitting electrodes are configured to receive the scanning signals by the receiving electrodes, thereby learning at least one touch position. As such, the present invention increases the signal-to-noise ratio by coupling the impedance elements between the emitter electrodes, thereby improving the accuracy of finger touch position detection.

Furthermore, the emitter electrodes of the present invention comprise a first emitter electrode group and a second emitter electrode group, and the first impedance elements are respectively coupled to the emitter electrodes of the first emitter electrode group and the The transmitting electrodes are coupled between the transmitting electrodes of the first transmitting electrode group and the transmitting electrodes of the second transmitting electrode group. In this way, the present invention can increase the transmitting electrode under the driving voltage circuit of the fixed capacitance detection through the interpolation arrangement of the transmitting electrodes, thereby increasing the detection range of the touch position.

Conventional technology:

10'‧‧‧ receiving electrode

20'‧‧‧Emission electrode

this invention:

10‧‧‧ receiving electrode

20‧‧‧Emission electrode

30‧‧‧First impedance element

301‧‧‧Capacitance signal

302‧‧‧Capacitance Signal

303‧‧‧Capacitance signal

304‧‧‧Capacitance Signal

40‧‧‧Source

45‧‧‧ Receiving unit

50‧‧‧First emitter electrode group

60‧‧‧second emitter electrode group

G0~G3‧‧‧First impedance component

G4~G6‧‧‧second impedance component

X0~X3‧‧‧ receiving electrode

Y0~Y7‧‧‧Emission electrode

The first figure is a schematic diagram of a conventional capacitive sensor of the present invention; the second figure is a schematic diagram of an embodiment of the touch panel of the present invention; and the third figure is between the plurality of transmitting electrodes of the present invention and the plurality of first impedance elements The fourth circuit is a diagram of the signal noise ratio of the touch panel of the present invention; the fifth figure is a schematic diagram of another embodiment of the touch panel of the present invention; FIG. 7 is a schematic view showing another embodiment of the touch panel of the present invention; and FIG. 8 is a schematic view showing still another embodiment of the touch panel of the present invention.

For a better understanding and understanding of the structural features and the efficacies of the present invention, please refer to the preferred embodiments and the detailed descriptions as follows: please refer to the second figure, which is A schematic diagram of one embodiment of a touch panel of the invention. As shown, the touch panel of the present invention includes a plurality of receiving electrodes 10, a plurality of transmitting electrodes 20, a plurality of first impedance elements 30, and a plurality of emitting sources 40. The receiving electrodes 10 are located in the first layer of the touch panel, and the transmitting electrodes 20 are located in the second layer of the touch panel, and the transmitting electrodes 20 are parallel and orthogonal to the receiving electrodes 10, that is, the receiving electrodes 10 The emitter electrodes 20 are electrically isolated from each other, and the receiver electrodes 10 are interleaved with the emitter electrodes 20.

The first impedance element 30 is coupled between the emitter electrodes 20, and in the embodiment, the first impedance elements 30 are respectively coupled between the emitter electrodes 20, that is, each An impedance element 30 is coupled between the emitter electrodes 20. The transmitting sources 40 are coupled to the transmitting electrodes 20 and the first impedance elements 30 to transmit a scanning signal and sequentially transmit scanning signals to the transmitting electrodes 20 for the receiving electrodes 10 to receive scanning signals. In the present embodiment, the at least one touch position is coupled to the emitter electrodes 20, and the first impedance elements 30 are respectively coupled between the emitter electrodes 20 and Between the plurality of sources 40, the present invention increases the signal-to-noise ratio by coupling the first impedance elements 30 between the emitter electrodes 20, thereby improving the accuracy of finger touch position detection. . The method of the present invention increases the signal-to-noise ratio by coupling the first impedance elements 30 between the emitter electrodes 20. The principle is described below.

Please refer to the third figure, which is an equivalent circuit between the plurality of transmitting electrodes and the plurality of first impedance elements of the present invention. As shown in the figure, it is assumed that the characteristics of the first impedance elements 30 are the same, and each of the emitter electrodes 20 is equivalent to an impedance Z0, and a noise signal source U is equivalently coupled to the emitter electrodes 20, wherein X To interface with the emitter electrodes 20, the response function is: among them, . Furthermore, since the signal noise ratio FM formula is as follows: among them, and Where Wzx is the number of transmit sources 40 and Wn is the number of the transmit electrodes 30, and Therefore, the signal noise ratio of the present invention is: Please also refer to the fourth figure, which is a graph of the signal noise ratio of the touch panel of the present invention. As shown in the figure, if the number of gates of the emitter electrodes 20 is 10, and there are noise sources under the emitter electrodes 20, if the emitter source 40 is coupled to one of the emitter electrodes 20, the signal The increase in the odds ratio must be greater than Z0, where Z1 tends to infinity, then the signal noise ratio is FM=1. Moreover, if the number of the emitter electrode gates is 10, and there are noise sources under the emitter electrodes 20, if the emitter source 40 is coupled to two of the emitter electrodes 20, if Z1 is equal to 4 Z0, then FM =1.02, which means the detection system has a SNR increase of 2%. Moreover, if the number of gates of the emitter electrodes 20 is 10, and there are noise sources under the emitter electrodes 20, if the emitter source 40 is four of the emitter electrodes 20, if Z1 is equal to Z0, then FM ~1.22, that is, the detection system SNR is increased by 20%. If Z1 is equal to 4 Z0, then FM~1.16, that is, the detection system SNR is increased by 16%. Therefore, it can be seen that the detection efficiency of the capacitance detecting component can be improved by the ratio of Z1, Z0, and the signal source and the noise source. Therefore, the present invention increases the signal noise ratio by coupling the first impedance elements 30 between the emitter electrodes 20, thereby improving the accuracy of finger touch position detection.

In addition, the touch panel of the present invention further includes a plurality of receiving units 45. The receiving units 45 are respectively coupled to the receiving electrodes 10 to receive the scanning signals to learn at least one touch position. Furthermore, the emitter electrode 20 and the receiving electrode 10 are a transparent conductive electrode, and the transparent conductive electrode is made of Indium Tin Oxide (ITO).

Please refer to FIG. 5 , which is a schematic diagram of another embodiment of the touch panel of the present invention. As shown in the figure, the touch panel of the present embodiment is different from the touch panel of the first embodiment in that the emitter electrodes of the touch panel of the embodiment include a first emitter electrode group 50 and a The second transmitting electrode group 60, the first impedance elements G0 G G3 are respectively coupled to the transmitting electrodes Y0 Y Y3 of the first transmitting electrode group 50 and the transmitting electrodes Y4 of the second transmitting electrode group 60 Between Y7, that is, one end of the first impedance element G0 of the present embodiment is connected to the transmitting electrode Y0 of the first transmitting electrode group 50, and the other end of the first impedance element G0 is connected to the emission of the second transmitting electrode group 60. Electrode Y6. Similarly, one end of the first impedance element G1 is connected to the emitter electrode Y1 of the first emitter electrode group 50, and the other end of the first impedance element G1 is connected to the emitter electrode Y4 of the second emitter electrode group 60. One end of the first impedance element G2 is connected to the emitter electrode Y2 of the first emitter electrode group 50, and the other end of the first impedance element G2 is connected to the emitter electrode Y5 of the second emitter electrode group 60. One end of the first impedance element G3 is connected to the first The emitter electrode Y3 of the emitter group 50 is emitted, and the other end of the first impedance element G3 is connected to the emitter electrode Y7 of the second emitter group 60. In this way, the present invention can increase the transmitting electrode under the driving voltage circuit of the fixed capacitance detection through the interpolation arrangement of the plurality of transmitting electrodes Y0~Y7 and the first impedance elements G0~G3, thereby increasing the detection of the touch position. range.

In addition, the emitters 40 of the present invention are respectively coupled to the emitter electrodes Y0~Y3 of the first emitter electrode group 50 and the emitter electrodes Y4~Y7 of the second emitter electrode group 60. Thus, the present invention can increase the signal noise ratio by directly coupling the transmitting electrodes Y0~Y7 to the transmitting source 40.

Please refer to the sixth figure, which is a schematic diagram of the capacitance detecting reaction of the fifth figure of the present invention. As shown in the figure, the capacitance signal 301 and the capacitance signal 304 are the maximum capacitance changes, the capacitance signal 302 is the secondary capacitance change signal, and the capacitance signal 303 is the smallest capacitance change signal, which is transmitted through the capacitance signal 302 and the capacitance signal 301 and the capacitance signal 304. The relationship can be determined by using the algorithm to determine the true touch position value. This is a common technique used by those skilled in the art and will not be described here. Taking the sixth figure as an example, the capacitance signal 304 is a false touch. The hit signal, the real touch signal is 301.

Please refer to the seventh figure, which is a schematic diagram of still another embodiment of the touch panel of the present invention. As shown in the figure, the touch panel of the present embodiment is different from the touch panel of the fifth embodiment in that at least one of the emitter electrodes Y0 to Y3 of the first emitter electrode group 50 of the embodiment is coupled to the second emitter electrode. At least one of the emitter electrodes Y4 to Y6 of the group 60, in the present embodiment, the emitter electrode Y0 of the first emitter electrode group 50 is coupled to the emitter electrode Y6 of the second emitter electrode group 60. Therefore, in this embodiment, the transmitting electrodes Y0~Y7 and the first impedance elements G0~G2 are interpolated, and the transmitting electrode can be added under the driving voltage circuit of the fixed capacitance detection, thereby increasing the touch. The detection range of the location.

Please refer to the eighth figure, which is a schematic diagram of still another embodiment of the touch panel of the present invention. As shown in the figure, the touch panel of the present embodiment further includes a plurality of second impedance elements G4 G G6. The second impedance elements G4 G G6 are respectively coupled between the emitter electrodes Y0 Y Y3 of the first emitter electrode group 50 and connected in series to the first impedance elements G0 G G3 . Therefore, in this embodiment, the transmitting electrodes Y0~Y7 and the impedance elements G0~G6 can be interpolated to increase the transmitting electrode under the driving voltage circuit of the fixed capacitance detection, thereby increasing the touch position. Detection range. The first impedance elements G0 G G3 and the second impedance elements G4 G G6 are a resistor.

In summary, the touch panel of the present invention has parallel and orthogonally complex receiving electrodes by a plurality of transmitting electrodes; a plurality of first impedance elements are coupled between the transmitting electrodes; and a plurality of transmitting sources are respectively coupled to the transmitting electrodes and The first impedance element transmits a scan signal and sequentially transmits the scan signal to the transmit electrodes for the receive electrodes to receive the scan signal, thereby learning at least one touch position. As such, the present invention increases the signal-to-noise ratio by coupling the impedance elements between the emitter electrodes, thereby improving the accuracy of finger touch position detection.

The invention is a novelty, progressive and available for industrial use, and should meet the requirements of the patent application stipulated in the Patent Law of China, and the invention patent application is filed according to law, and the prayer bureau will grant the patent as soon as possible. prayer.

However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the shapes, structures, features, and spirits described in the claims are equivalently changed. Modifications are intended to be included in the scope of the patent application of the present invention.

10‧‧‧ receiving electrode

20‧‧‧Emission electrode

30‧‧‧First impedance element

40‧‧‧Source

45‧‧‧ Receiving unit

Claims (8)

A touch panel includes: a plurality of receiving electrodes; a plurality of transmitting electrodes parallel and orthogonal to the receiving electrodes; a plurality of first impedance elements coupled between the transmitting electrodes; and a plurality of transmitting sources coupled to the respective Transmitting the electrodes and the first impedance elements to emit a scan signal and sequentially transmitting the scan signals to the transmit electrodes for receiving the scan signals, thereby learning at least one touch position; The transmitting electrode includes a first transmitting electrode group and a second transmitting electrode group, and the first impedance elements are respectively coupled to the transmitting electrodes of the first transmitting electrode group and the second transmitting electrode group. Between the emitter electrodes, the touch panel includes a plurality of second impedance elements respectively coupled between the emitter electrodes of the first emitter electrode group and connected in series to the first impedance elements. The touch panel of claim 1, wherein the first impedance elements are respectively coupled between the emitter electrodes. The touch panel of claim 1, wherein the at least one transmitting electrode of the first transmitting electrode group is coupled to the at least one transmitting electrode of the second transmitting electrode group. The touch panel of claim 1, wherein the emitters are respectively coupled to the emitter electrodes of the first emitter electrode group and the emitter electrodes of the second emitter electrode group. The touch panel of claim 1, further comprising: The plurality of receiving units are respectively coupled to the receiving electrodes to receive the scanning signal to learn at least one touch position. The touch panel of claim 1, wherein the first impedance element and the second impedance element are a resistor. The touch panel of claim 1, wherein the transmitting electrodes and the receiving electrodes are transparent conductive electrodes. The touch panel of claim 7, wherein the transparent conductive electrode is made of Indium Tin Oxide (ITO).