TWI721785B - Integrated touch device - Google Patents

Abstract

The invention provides an integrated touch device, which includes a first substrate, a second substrate, a plurality of first conductive electrodes, a plurality of second conductive electrodes, and a plurality of third conductive electrodes. The first conductive electrodes, the second conductive electrodes, and the third conductive electrodes are formed above the first substrate, further the second substrate is above the first substrate. The first conductive electrodes are interdigitatedly formed between the second conductive electrodes, and the third conductive electrodes are between the first conductive electrodes. The third conductive electrodes, the first conductive electrodes and the second conductive electrodes are formed on the same plane.

Description

Integrated touch device

The invention relates to a touch device, in particular to a touch device that integrates touch, tactile feedback and pressure sensing.

Today's haptic feedback technology is mostly implemented by actuator elements, but the thickness of the elements is a big obstacle to the miniaturization of panel devices. Recently, larger and thinner piezoelectric ceramics have been used as actuator elements. However, ceramic materials are relatively fragile and not transparent. Therefore, they are usually installed in non-visible areas or behind the backlight, and buffer elements need to be added. To solve the problem of device miniaturization, but it is another limitation to the development of full-screen screens in the future; force touch needs to be made through a pressure sensor. At present, when the device needs to be thinned, the thickness of the sensor will be affected. The problem of transformation. And if the touch function is still required, the touch function must be installed on the original screen first, which is a big increase in cost.

Furthermore, today's force touch and tactile feedback are usually realized by the pressure sensors and actuators hidden in the device, but this has limitations for the future development of thinner and borderless screens that have almost no non-visible areas. And when the touch function is needed, an additional touch sensor is also needed. Therefore, the present invention uses piezoelectric actuation elements to integrate three functions on the panel, thereby reducing the thickness of the device and the manufacturing cost.

The object of the present invention is to provide an integrated touch device that uses polyvinylidene difluoride (PVDF) to realize the functions of force touch and haptic, eliminating the need for additional actuators With force sensor. Then use the conductive electrodes that drive PVDF to make a touch sensor, which integrates touch, tactile feedback and pressure sensing functions into a touch device.

To achieve the above objective, the present invention provides an integrated touch device, which includes a first substrate, a second substrate, a plurality of first conductive electrodes, a plurality of second conductive electrodes, and a plurality of third conductive electrodes. The first conductive electrodes, the second conductive electrodes, and the third conductive electrodes are formed on the first substrate, and the second substrate is located on the first substrate. The first conductive electrodes are interdigitally formed between the second conductive electrodes, and the third conductive electrodes are located between the first conductive electrodes. The third conductive electrodes, the first conductive electrodes, and the second conductive electrodes 41 are formed on the same plane.

The present invention provides an integrated touch control device, which includes a first substrate, a second substrate, a plurality of first conductive electrodes, a plurality of second conductive electrodes, and a plurality of third conductive electrodes. The first conductive electrodes are stacked and formed on the first substrate, and the second conductive electrodes and the third conductive electrodes are formed on the first substrate. Two ends of the second conductive electrodes are connected to the first conductive electrodes, and the third conductive electrodes are located between the first conductive electrodes. The third conductive electrodes, the first conductive electrodes, and the second conductive electrodes are formed on different planes. The second substrate is located on the first conductive electrodes and the second conductive electrodes.

10: Panel drive circuit

20: Integrated touch panel

30: The first substrate

31: second substrate

40: The first conductive electrode

41: second conductive electrode

42: third conductive electrode

50: display area

60: signal generating circuit

61: Multiplexer

62: processor

RX: Detection signal

TX: Drive signal

The first figure: it is a schematic diagram of an embodiment of the integrated touch device of the present invention; the second figure: it is the first stack of the first embodiment of the integrated structure of the integrated touch device of the present invention Flow chart; the third figure: it is the second stacking flow chart of the first embodiment of the integrated structure of the integrated touch device of the present invention; the fourth figure: it is the second stacking flow chart of the integrated touch device of the present invention The third stacking flowchart of the first embodiment of the integrated structure; the fifth figure: it is a schematic diagram of the second embodiment of the integrated structure of the integrated touch device of the present invention; the sixth figure: it is this A schematic diagram of the third embodiment of the integrated structure of the integrated touch device of the invention; Figure 7: it is a schematic diagram of the embodiment of the panel driving circuit of the integrated touch device of the present invention; and Figure 8: it It is a flowchart of an embodiment of the integrated touch panel driven by the panel driving circuit of the present invention.

Please refer to the first figure, which is a schematic diagram of an embodiment of the integrated touch device of the present invention. As shown in the figure, the integrated touch device includes a panel driving circuit 10 and an integrated touch panel 20. The panel driving circuit 10 drives the integrated touch panel 20 to perform touch, tactile feedback, and pressure sensing functions. The integrated touch panel 20 includes an integrated structure, which implements force touch and haptic functions, and utilizes a plurality of third conductive electrodes 42 to be driven (as shown in the third figure) And a plurality of second conductive electrodes 41 (as shown in the third figure) are used as touch sensors and have touch, tactile feedback and pressure sensing functions. Wherein, the third conductive electrode 42 is made of polyvinylidene difluoride (PVDF), and it is not necessary to use an additional actuator and a force sensor to provide tactile feedback and pressure sensing functions. In addition, in addition to polyvinylidene fluoride, polyvinyl fluoride (PVF) or polyvinyl chloride (Polyvinyl Chloride, PVC) piezoelectric polymer (piezoelectric polymer) can be used to make the third conductive electrodes 42. ). The production of the first conductive electrodes 40 and the second conductive electrodes 41 can use binary oxides, ternary oxides, or nano carbon tubes (CNT).

Please refer to the second figure, which is the first stacking flowchart of the first embodiment of the integrated structure of the integrated touch device of the present invention. As shown in the figure, the integrated structure of the integrated touch panel 20 includes a plurality of first conductive electrodes 40 and a plurality of second conductive electrodes 41, and the first conductive electrodes 40 and the second conductive electrodes 41 can be used as driving electrodes ( TX) and transmission electrode (RX). In this way, the panel driving circuit 10 outputs a driving signal TX to detect a detection signal RX to perform the corresponding touch function. Moreover, the panel driving circuit 10 receives a positive piezoelectric signal and compares the positive voltage signal with a threshold signal to generate an inverse piezoelectric signal to the third conductive electrodes 42 to control the third conductive electrodes 42 to vibrate. Or perform the corresponding voltage control function. Furthermore, the first conductive electrodes 40 and the second conductive electrodes 41 are disposed on a first substrate 30. Each first conductive electrode 40 can drive at least one second conductive electrode 41, or each second conductive electrode 41 can drive at least one first conductive electrode 40, so the embodiment does not limit the driving method of touch detection. In addition, one end of the first conductive electrodes 40 is spaced apart from the second conductive electrodes 41, the other ends of the first conductive electrodes 40 are connected to the second conductive electrodes 41, and the first conductive electrodes 40 intersect The formula is formed between the second conductive electrodes 41.

Please refer to the third figure, which is the second stacking flowchart of the second embodiment of the integrated structure of the integrated touch device of the present invention. As shown in the figure, the integrated structure includes a plurality of third conductive electrodes 42. The third conductive electrodes 42 and the first conductive electrodes 40 serve as piezoelectric elements to realize the functions of tactile feedback and pressure sensing. Wherein, the third conductive electrodes 42 are deposited and patterned between the interdigitated first conductive electrodes 40, the third conductive electrodes 42, the first conductive electrodes 40, and the second conductive electrodes 41 is formed on the same plane, and the third conductive electrodes 42 are spaced apart from the second conductive electrodes 41. Furthermore, the thickness and width of the third conductive electrodes 42 are equal to the thickness and width of the first conductive electrodes 40, or the thickness and width of the third conductive electrodes 42 can be changed to be similar to those of the first conductive electrodes. The thickness and width of 40, that is, the thickness and width of the third conductive electrodes 42 may be slightly lower or higher than the thickness and width of the first conductive electrodes 40.

The first conductive electrodes 40, the second conductive electrodes 41, and the third conductive electrodes 42 are disposed on the first substrate 30 and constitute a laminated piezoelectric element. The second conductive electrodes 41 on both sides of the piezoelectric element can be used as touch sensors, and the capacitive coupling between the finger and the screen can be used to generate a sense of friction on a part or the entire screen when sliding on the surface. Furthermore, pressure sensing and tactile feedback are achieved through the reverse voltage effect of the piezoelectric material of the piezoelectric element (such as polyvinylidene fluoride), and the output of different driving frequencies and different voltage levels is used to allow users to obtain Different tactile feedback. For example, the vibration frequency of the third conductive electrodes 42 is 1KHz~99KHz.

Please refer to FIG. 4, which is a third stacking flowchart of the first embodiment of the integrated structure of the integrated touch device of the present invention. As shown in the figure, the integrated structure is disposed between the first substrate 30 and a second substrate 31, that is, the second substrate 31 covers the third conductive electrodes 42, the first conductive electrodes 40, and the second conductive electrodes. Electrode 41. The first substrate 30 and the second substrate 31 are a cover substrate of the display panel, so the integrated structure can be made in the protective substrate, and has touch, tactile feedback and pressure Force sensing function. Among them, the production of the first substrate 30 and the second substrate 31 may use polycarbonate (PC), polyethylene terephthalate (PET) or/and polymethylmethacrylate (polymethylmethacrylate). (methyl methacrylate, PMMA).

Please refer to FIG. 5, which is a schematic diagram of the second embodiment of the integrated structure of the integrated touch device of the present invention. As shown in the figure, the integrated touch panel includes a display area 50, and the first conductive electrodes 40, the second conductive electrodes 41 and the third conductive electrodes 42 are formed on the display area 50. The first substrate 30 and the second substrate 31 are disposed on the display area 50. The embodiment in FIG. 5 shows that the integrated touch panel may include a display function. However, it can be seen from the embodiment in FIG. 4 that the integrated touch panel may not be combined with a display panel. In other words, the first conductive electrodes 40, the second conductive electrodes 41, and the third conductive electrodes 42 of the integrated structure may not be arranged in the protective substrate, but arranged in appropriate positions in the display area 50, that is, the protective Under the substrate. In other words, the integrated structure of the present invention can be directly externally attached to a common touch panel element, such as an on-cell type, as shown in the fifth embodiment. Alternatively, the embodiment in FIG. 5 can be modified such that the first substrate 30 of the integrated structure is directly the upper substrate of the display area 50 of the display panel, so that the general display panel has the functions of touch and tactile feedback.

Please refer to Figure 6, which is a schematic diagram of the third embodiment of the integrated structure of the integrated touch device of the present invention. As shown in the figure, the integrated structure can be changed to the vertical laminated piezoelectric element drawn in the sixth figure, and its structure is different from the laminated piezoelectric element on the plane drawn in the fifth figure. That is, the patterns of the first conductive electrodes can be in the interdigitated pattern of the second to fifth figures or the block pattern of the sixth figure. The first conductive electrodes 40 of the embodiment in FIG. 6 are stacked and formed on the display area 50, and two ends of the second conductive electrodes 41 are connected to the first conductive electrodes 40 in parallel. The third conductive electrodes 421 are formed on the display area 50, and the third conductive electrodes 42 are interdigitated between the first conductive electrodes 40, that is, the first conductive electrodes 40 and the second conductive electrodes 40 are interdigitated. The three conductive electrodes 42 are stacked and formed on the display area 50. Among them, these third guides The electrical electrode 42 and the first conductive electrodes 40 and the second conductive electrodes 41 are formed on different planes. Furthermore, in the sixth figure, two third conductive electrodes 42 are arranged between the three first conductive electrodes 41. However, the structure can be changed to provide one third conductive electrode 42 between the two first conductive electrodes 41, that is, five The layer structure is changed to a three-layer structure. In addition, the thickness of the piezoelectric element in the sixth figure is tens of nanometers to hundreds of nanometers, and the integrated structure of the embodiment in the sixth figure can be the same as the integrated structure of the embodiment in the fourth and fifth figures, that is, The integrated structure can be directly hung on the display panel (display area 50).

Please refer to FIG. 7, which is a schematic diagram of an embodiment of the panel driving circuit of the integrated touch device of the present invention. As shown in the figure, the panel driving circuit 10 includes a signal generating circuit 60, which can generate an AC signal or a high voltage DC signal. Furthermore, the panel driving circuit 10 may further include a multiplexer 61 and a processor 62. The multiplexer 61 generates a driving signal TX according to an AC signal or a high voltage DC signal generated by the panel driving circuit 10. The driving signal TX is transmitted to the first conductive electrodes 41 for detecting touch, pressing or sliding operations. The second conductive electrodes 42 are coupled to the processor 62, so that the processor 62 receives the detection signal RX to determine the operation of touching, pressing or sliding, and controls the output of the multiplexer 61. The panel driving circuit 10 is coupled to the processor 62 and outputs an AC signal or a high voltage DC signal to the multiplexer 61 according to the output of the processor 62.

Please refer to FIG. 8, which is a flowchart of an embodiment of the integrated touch panel driven by the panel driving circuit of the present invention. As shown in the figure, in step S01, when a finger touches the integrated touch panel, a detection signal RX is generated. In step S02, the panel driving circuit 10 determines whether there is a sliding condition based on a sliding threshold signal and a detection signal RX. If there is no sliding, return to step S01, if there is sliding, continue to step S03. In step S03, the panel driving circuit 10 determines whether there is a pressing condition based on a pressing threshold signal and a detection signal RX. When there is only sliding on the screen without pressing, the panel driving circuit 10 will not be triggered to drive the laminated piezoelectric element to generate vibration, and step S31 is continued. In step S31, when it is judged that the hand When sliding on the screen, the panel driving circuit 10 drives the integrated touch panel to generate sliding feedback. Moreover, in step S32, the panel driving circuit 10 drives the integrated touch panel, and the capacitive coupling between the finger and the screen (integrated touch panel) is used to generate a sense of friction on a part or the entire screen (integrated touch panel) . When it is determined that the finger is the operation of pressing the screen, step S04 is continued, and the panel driving circuit 10 performs the corresponding pressing function according to the operation of the finger, that is, a pressing signal is higher than a pressing threshold signal. Furthermore, in step S41, the panel driving circuit 10 outputs an AC signal or a high voltage DC signal to the piezoelectric element (ie, the conductive electrodes 40-42). In step S42, the part or the entire surface of the piezoelectric elements generates a positive piezoelectric effect and deforms due to the AC signal or the high-voltage DC signal, and generates a pressing signal to the panel driving circuit 10. If the pressing signal is lower than the pressing threshold signal, the panel driving circuit 10 controls the processor 62 according to the pressing signal, and the processor 62 controls the multiplexer 61 to output different frequency and voltage levels. Therefore, in step S43, the piezoelectric element The positive and negative charges inside the actuation layer are separated, so that the distance of the electric dipole moment changes, which causes the piezoelectric element to contract or expand, and convert electrical energy into mechanical energy to generate vibration. In this way, in step 44, the user obtains a different tactile feedback experience. Finally, the operation is ended in step S05, and the next operation of the finger is detected in step S01.

In summary, the present invention provides an integrated touch device, which includes a first substrate, a second substrate, a plurality of first conductive electrodes, a plurality of second conductive electrodes, and a plurality of third conductive electrodes. The first conductive electrodes, the second conductive electrodes, and the third conductive electrodes are formed on the first substrate, and the second substrate is located on the first substrate. The first conductive electrodes are interdigitally formed between the second conductive electrodes, and the third conductive electrodes are between the first conductive electrodes 40. The third conductive electrodes, the first conductive electrodes, and the second conductive electrodes 41 are formed on the same plane.

The present invention provides an integrated touch control device, which includes a first substrate, a second substrate, a plurality of first conductive electrodes, a plurality of second conductive electrodes, and a plurality of third conductive electrodes. The first conductive The electrode stack is formed on the first substrate area, and the second conductive electrodes and the third conductive electrodes are formed on the first substrate. Two ends of the second conductive electrodes are connected to the first conductive electrodes, and the third conductive electrodes are located between the first conductive electrodes. The third conductive electrodes, the first conductive electrodes, and the second conductive electrodes are formed on different planes. The second substrate is located on the first conductive electrodes and the second conductive electrodes.

30: The first substrate

40: The first conductive electrode

41: second conductive electrode

42: third conductive electrode

Claims (9)

An integrated touch device, comprising: a first substrate; a plurality of first conductive electrodes formed on the first substrate; a plurality of second conductive electrodes formed on the first substrate, the first conductive electrodes The electrodes are interdigitally formed between the second conductive electrodes; a plurality of third conductive electrodes are formed on the first substrate, the third conductive electrodes are located between the first conductive electrodes, and the third conductive electrodes are located between the first conductive electrodes. The conductive electrodes, the first conductive electrodes, and the second conductive electrodes are formed on the same plane; a second substrate is located on the first substrate; and a panel driving circuit that outputs a driving signal to detect a touch Control signal to perform the corresponding touch function; the panel driving circuit receives a positive piezoelectric signal and compares the positive voltage signal with a threshold signal to generate an inverse piezoelectric signal to the third conductive electrode to control the third conductive The electrode vibrates, or performs the corresponding voltage control function. According to the integrated touch device described in claim 1, wherein the third conductive electrodes are separated from the second conductive electrodes by a distance. According to the integrated touch device described in claim 1, wherein the thickness of the third conductive electrodes is equal to the thickness of the first conductive electrodes. An integrated touch device, comprising: a first substrate; a plurality of first conductive electrodes formed on the first substrate; A plurality of second conductive electrodes are formed on the first substrate, the first conductive electrodes are interdigitally formed between the second conductive electrodes; a plurality of third conductive electrodes are formed on the first substrate, The third conductive electrodes are located between the first conductive electrodes, the third conductive electrodes, the first conductive electrodes, and the second conductive electrodes are formed on the same plane; and a second substrate is located on the first conductive electrode. On a substrate; wherein the third conductive electrodes are piezoelectric polymers of polyvinylidene difluoride (PVDF), polyvinyl fluoride (PVF) or polyvinyl chloride (PVC) (piezoelectric polymer). According to the integrated touch device described in item 1 or 4 of the scope of patent application, wherein the first conductive electrodes and the second conductive electrodes are binary oxides, ternary oxides or carbon nanotubes (Nano carbon tube,CNT). According to the integrated touch device described in claim 1 or 4, wherein the first substrate is disposed on a display area, and the second substrate covers the third conductive electrodes and the first conductive electrodes And these second conductive electrodes. According to the integrated touch device described in claim 6, wherein the first substrate and the second substrate are made of polycarbonate (PC), polyethylene terephthalate (polyethylene terephthalate, PET) or/and poly(methyl methacrylate, PMMA). An integrated touch device, comprising: a first substrate; a plurality of first conductive electrodes stacked and formed on the first substrate; A plurality of second conductive electrodes are formed on the first substrate, and two ends of the second conductive electrodes are connected to the first conductive electrodes; a plurality of third conductive electrodes are formed on the first substrate, and the second conductive electrodes are formed on the first substrate. Three conductive electrodes are located between the first conductive electrodes, the third conductive electrodes, the first conductive electrodes, and the second conductive electrodes are formed on different planes; and a second substrate is located on the first conductive electrodes. Above the electrodes and the second conductive electrodes. According to the integrated touch device described in claim 8, wherein the width of the third conductive electrodes is equal to the width of the first conductive electrodes.

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