TWI460625B - Touch apparatus and driving method thereof - Google Patents

Description

Touch device and driving method thereof

The present invention relates to a driving method, and more particularly to a touch device and a driving method thereof.

Recently, the flat panel display (FPD) technology has developed rapidly, and has gradually replaced the traditional cathode ray tube (CRT) display due to its superior size, low power consumption and no radiation. Devices and applications to a wide range of electronic products.

In addition, in recent years, touch panels have also been widely used in general consumer electronic products, such as mobile communication devices, digital cameras, digital music players (MP3), personal digital assistants (PDAs), satellite navigators (GPS). ), hand-held PCs, and even new Ultra Mobile PCs (UMPCs). The touch panel described above is combined with the display screen to become a touch display module.

FIG. 1 is a schematic diagram of a conventional touch display device 1 . The touch display device includes a display panel 11 and a touch panel 12 . The touch panel 12 is disposed on one side of the display panel 11 . In the prior art, in order to prevent the signals of the display panel 11 and the touch panel 12 from interfering with each other, a shielding layer 13 is disposed between the display panel 11 and the touch panel 12 . The shielding layer 13 is made of a conductive material to prevent the signal of the display panel 11 from interfering with the touch panel 12.

However, the shielding layer 13 forms a capacitive effect with the electrodes on the touch panel 12, thereby increasing the sensing load of the touch panel 12 on the capacitor and reducing the touch sensitivity of the touch panel 12.

Therefore, how to provide a touch device and a driving method thereof can achieve the shielding effect at the same time and reduce the sensing load on the capacitor, thereby improving the touch performance, which is one of the current important topics.

In view of the above problems, an object of the present invention is to provide a touch device capable of simultaneously achieving a shadowing effect and reducing a sensing load on a capacitor, thereby improving touch performance and a driving method thereof.

To achieve the above objective, a touch device according to the present invention includes a touch panel having a substrate, a plurality of first electrodes, and a plurality of second electrodes, a sensing driving circuit, and a shielding electrode. The first electrodes are disposed on the substrate and spaced apart from each other. The second electrodes are disposed on the substrate and spaced apart from each other. The shielding electrode is disposed on one side of the substrate. The sensing driving circuit controls the signal of the shielding electrode to be synchronized with the signal of one of the first electrodes and the second electrodes.

In order to achieve the above object, the present invention discloses a driving method for a touch device, wherein the touch device includes a touch panel having a substrate, a plurality of first electrodes, and a plurality of second electrodes, a shielding electrode, and a sensing driving circuit. The sensing driving circuit controls the first electrodes, the second electrodes, and the shielding electrodes electrically connected, respectively. The driving method includes: transmitting a first signal to the first electrodes; transmitting a second signal to the second electrodes; and transmitting a masking signal to the shielding electrode, shielding the signal and the first signal and the second signal One is synchronized.

As described above, in the touch device and the driving method thereof, a masking signal is transmitted to the shielding electrode, and the shielding signal is one of the first signal of the first electrode and the second signal of the second electrode. The system is synchronized. Therefore, there is no potential difference between the shielding electrode and the first electrode or the second electrode, so that the capacitive effect of the shielding electrode and the first electrode or the second electrode is nearly zero, thereby reducing the sensing load of the touch device on the capacitor. In turn, the touch sensitivity of the touch device is improved. In addition, the shielding electrode can form a shadowing effect on the signal of the display panel, so that the signals between the display panel and the touch panel do not interfere with each other.

Hereinafter, a touch device and a driving method thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

2 is an exploded perspective view of a touch device 2 according to a preferred embodiment of the present invention, and FIG. 3 is a schematic side view of the touch device 2. Please refer to FIG. 2 and FIG. 3 to illustrate the structure of the touch device 2 and the manner of actuation thereof.

The touch device 2 includes a touch panel 20 having a substrate 21 , a plurality of first electrodes 22 , and a plurality of second electrodes 23 , a sensing driving circuit 24 , and a shielding electrode 25 . The substrate 21 can be a flat plate or a film, and the material thereof can be, for example, glass, plastic or other dielectric materials. In this embodiment, the substrate 21 is a glass substrate.

The first electrodes 22 are disposed on the substrate 21 and spaced apart from each other. In the present embodiment, "setting" may refer to direct connection or indirect connection. Here, the first electrode 22 is directly disposed on one surface of the substrate 21. The first electrode 22 is made of a conductive material, such as a transparent conductive material, such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the first electrodes 22 are spaced apart from each other and arranged in parallel with each other, first The shape of the electrode 22 is exemplified by a strip shape.

The second electrode 23 is disposed on the substrate 21 and spaced apart from each other, and the second electrode 23 can be directly disposed on the substrate 21 or disposed on the substrate 21 by at least one film layer; wherein the second electrode 23 is connected to the first electrode 22 is located on the same side of the substrate 21, and an insulating layer 26 is disposed between the first electrode 22 and the second electrode 23. The second electrode 23 is also made of a conductive material, for example, transparent conductive, and the second electrodes 23 are spaced apart from each other and disposed in parallel with each other, and the shape of the second electrode 23 is exemplified by a strip shape.

It should be noted that the first electrode 22 defined in this embodiment can also serve as the second electrode, and the second electrode 23 can serve as the first electrode, and can be exchanged therebetween. In this case, the first electrodes 22 are defined as row electrodes, and the second electrodes 23 are column electrodes. The first electrodes 22 and the second electrodes 23 are spatially staggered and form an angle. The first electrodes 22 and the second electrodes 23 are substantially 90 degrees from the projection direction.

The shielding electrode 25 can be disposed on the same side of the substrate 21 as the first electrode 22 or the second electrode 23 or on the opposite side of the substrate 21; here, the first electrode 22 and the second electrode 23 are located on the same side of the substrate 21. The shielding electrode 25 is disposed on the opposite side of the substrate 21, that is, the substrate 21 is located between the shielding electrode 25 and the first electrode 22 and the second electrode 23.

As shown in FIG. 3, the sensing driving circuit 24 is electrically connected to the second electrode 23 and the shielding electrode 25, and is configured to drive the second electrode 23 and the shielding electrode 25, and the signal of the shielding electrode 25 and the first electrode are 22 and one of the signals of the second electrodes 23 are synchronized; wherein the signal of the shielding electrode 25 is synchronized with the signal of the second electrodes 23. Here, the signal synchronization means that the frequency and phase of the two signals are substantially the same. In addition, the driving of the first electrode 22 can also be performed by the sensing driving circuit 24.

Since the capacitor stores the energy formula as W=1/2*CV ² , where W is the energy, C is the capacitance value, and V is the potential difference across the capacitor. Therefore, when the signal of the shielding electrode 25 is synchronized with the signals of the second electrodes 23, the capacitor formed between the shielding electrode 25 and the second electrode 23 does not store any energy and electric charge, so that the shielding electrode 25 and the second electrode 23 are A capacitive effect is not formed between the two, so that the influence of the capacitive sensing load of the touch device 2 can be reduced.

Hereinafter, the first driving circuit 22 and the second electrodes 23 are respectively driven by the sensing driving circuit 24 to illustrate the operation of the sensing driving circuit 24. The sensing driving circuit 24 respectively transmits a first signal to the first electrodes 22, respectively transmits a second signal to the second electrodes 23, and transmits a masking signal to the shielding electrodes 25, as shown in FIG. 4 to FIG. 6 illustrates a timing diagram of different aspects of the first signal, the second signal, and the masking signal.

Referring to FIG. 4, the sensing driving circuit 24 respectively transmits the first signal S ₁ to the first electrodes Y ₁ ～ Y _N , wherein the number of the first signals S ₁ and the first electrodes Y ₁ ～ Y _N The number is the same. FIG. 3 is only described by the first signal S ₁ being transmitted to the two first electrodes Y ₁ and Y ₂ , respectively. Here, the sensing driving circuit 24 sequentially drives the first electrodes Y ₁ to Y _N , that is, only one first electrode is driven per unit time. When the first electrodes Y ₁ -Y _N are scanned and driven, the sensing driving circuit 24 transmits the second signal S ₂ to the second electrodes X ₁ -X _N , that is, simultaneously drives the second electrodes X ₁ ～X _N , such that the duty cycle of the first signal S ₁ and the second signal S ₂ overlap. The number of the second signals S _{2 is} the same as the number of the second electrodes X ₁ to X _N . The sensing driving circuit 24 senses the signals on the second electrodes X ₁ -X _N to apply to the touch calculation to obtain the touch position. The masking signal C of the shielding electrode 25 is synchronized with the second signal S _{2 of the} second electrodes 23. Here, the amplitudes of the masking signal C and the second signal S _{2 are} substantially the same, or the amplitudes are within 10%, so as to minimize the capacitive effect between each other. In addition, the amplitude of the first signal S ₁ is greater than the amplitude of the second signal S ₂ .

Referring to FIG. 5, the main difference from the timing diagram shown in FIG. 4 is that the second signal S ₂ in FIG. 5 appears after the first signal S ₁ , and the duty cycles of the two do not overlap. Here, the masking signal C of the shielding electrode 25 is synchronized with the second signal S _{2 of the} second electrodes X ₁ to X _N .

Referring to FIG. 6, the main difference from the timing chart shown in FIG. 5 is that the second signal S ₂ in FIG. 6 appears after the first signal S ₁ , but the duty cycle of the two has a part. overlapping. Here, the masking signal C of the shielding electrode 25 is synchronized with the second signal S _{2 of the} second electrodes X ₁ to X _N .

FIG. 7 is a side view of another touch device 3 according to a preferred embodiment of the present invention. The touch device 3 includes a touch panel 30 having a substrate 31 , a plurality of first electrodes 32 , and a plurality of second electrodes 33 , a sensing driving circuit 34 , and a shielding electrode 35 . The main difference between the first electrode 32 and the second electrode 33 of the touch device 3 is located on the opposite side of the substrate 31, and the shielding electrode 35 is disposed on one of the first electrodes 32 by an insulating layer 36. side. The sensing driving circuit 34 is electrically connected to the first electrode 32, the second electrode 33 and the shielding electrode 35, and the signal of the shielding electrode 35 is synchronized with the signal of the second electrodes 33.

FIG. 8 is a top plan view of a first electrode 42 and a second electrode 43 of another touch device 4 according to a preferred embodiment of the present invention. The main difference from the above is that the first electrode 42 and the second electrode 43 are in the same plane. Here, the first electrode 42 and the second electrode 43 respectively have, for example, a diamond-shaped or flat-shaped quadrilateral electrode portion and a bridge portion, and the electrode portions are located on the same plane and are not connected to each other. In addition, an insulating layer (not shown) is disposed on the bridge portion where the first electrode 42 and the second electrode 43 overlap to isolate the signals of the first electrode 42 and the second electrode 43.

FIG. 9A is a side view of another touch device 5a according to a preferred embodiment of the present invention. The difference from the above aspect is that the touch device 5a further includes a display panel 57a, and the display panel 57a is disposed opposite to the substrate 21. This embodiment does not limit the kind of the display panel 57a, and may be, for example, a liquid crystal display panel, an organic light emitting diode display panel, a plasma display panel, a field emission display panel, or the like. The shielding electrode 25 is located between the display panel 57a and the first electrode 22 and the second electrode 23 to shield the signal of the display panel 57a.

FIG. 9B is a side view of another touch device 5b according to a preferred embodiment of the present invention. The main difference from the touch device 5a is that the shielding electrode 25 of the touch device 5b is located inside the display panel 57b, but is located in the display panel 57b, between the common electrode 571 and the second electrode 23 on the filter substrate. Further, the signal below the common electrode 571 is shielded to avoid affecting the signals of the first electrode 22 and the second electrode 23.

In addition, the shielding electrode 25 shown in FIG. 2 is planar, that is, it is not patterned. However, the shield electrode of the present invention can have a variety of variations, as exemplified by Figures 10A through 10C.

Referring to FIG. 10A, another embodiment of the shielding electrode 25a of the preferred embodiment of the present invention has a strip shape, that is, the shielding electrode 25a has a plurality of strip electrode portions 251, and the strip electrode portions 251 are arranged in parallel and arranged at intervals. And connected by a wire 252 to transmit a masking signal. The pattern of the strip electrode portion 251 of the shielding electrode 25a may correspond to the pattern of the second electrode 23; for example, the pattern of the strip electrode portion 251 may be designed corresponding to the area occupied by the plurality of second electrodes 23. In addition, the strip-shaped shielding electrode 25a can be further compensated with the compensation circuit to avoid the influence of the distance between the shielding electrodes 25a and the sensing driving circuit. The compensation circuit can compensate for, for example, the line paths of the masking signals of the strip electrodes 251 are not equal.

Referring to FIG. 10B, FIG. 10B is a top plan view of a first electrode 42a and a second electrode 43a of another touch device 4a according to a preferred embodiment of the present invention. The first electrode 42a and the second electrode 43a are disposed on the same plane. The shielding electrode 45a is disposed on the same plane as the first electrode 42a or the second electrode 43a. Here, the shielding electrode 45a is disposed on the same plane as the first electrode 42a and the second electrode 43a. The shielding electrode 45a is formed between the first electrode 42a and the second electrode 43a, and has a plurality of main body portions 451 and a plurality of connecting portions 452, and each connecting portion 452 connects the two main body portions 451 to turn on the entire shielding electrode 45a. Of course, the connecting portion 452 needs to be provided with an insulating layer 46a (dotted line) across the first electrode 42a or the second electrode 43a for electrical isolation. In addition, the second electrode 43a to be separated also needs a connecting portion B to be bridged, and the connecting portions 452 and B may be linear or curved. Here, the connecting portions 452 and B are taken as a straight line.

Referring to FIG. 10C, FIG. 10C is a top plan view of the first electrode 42b and the second electrode 43b of another touch device 4b according to a preferred embodiment of the present invention. The first electrode 42b and the second electrode 43b are disposed on the same plane. The shielding electrode 45b is disposed on the same plane as the first electrode 42b or the second electrode 43b. Here, the shielding electrode 45a is disposed on the same plane as the first electrode 42b and the second electrode 43b. The shielding electrode 45a is formed between the first electrode 42a and the second electrode 43a, and has a plurality of main body portions 453 and a plurality of connecting portions 454, and each connecting portion 454 connects the two main body portions 453. Of course, the connecting portion 454 needs to be provided with an insulating layer 46b across the first electrode 42b or the second electrode 43b for electrical isolation. In addition, the separated second electrode 43a also needs a connecting portion B to be bridged. Here, the connecting portions 454 and B are snake-like, which can achieve the effect that the metal is not easily reflective. Further, the shape of the main body portion 453 of the shielding electrode 45b is also different from the shape of the main body portion 451 of FIG. 10B. Here, the main body portion 453 has an enlarged portion as an example, and the connecting portion 454 is bridged between the two main body portions 453. between.

FIG. 11 is a flow chart showing the steps of a method for driving a touch device according to a preferred embodiment of the present invention. The driving method can be applied to any of the above touch devices. The touch device 2 includes a touch panel 20 having a substrate, a plurality of first electrodes 22 and a plurality of second electrodes 23, a shielding electrode 25, and a sensing driving circuit 24, wherein the sensing driving circuit 24 respectively controls the electrical connection. The first electrode 22, the second electrode 23, and the shielding electrode 25. The driving method includes: transmitting a first signal S ₁ to the first electrodes Y ₁ ～ Y _N (S01), transmitting a second signal S ₂ to the second electrodes X ₁ ～X _N (S02), and transmitting a blanking signal to the shielding electrode 25, a first blanking signal C and the signal S ₁ and the signal S wherein the second synchronizing system by one (S03) ₂ of.

The first signal S ₁ may be sequentially supplied to the first electrodes Y ₁ ～ Y _N or simultaneously to the first electrodes Y ₁ ～ Y _N , and the second signal S ₂ may be sequentially given to the second electrodes X _{1 .} ～X _N , or the second electrodes X ₁ to X _{N are} simultaneously supplied. Here, the first signal S ₁ is sequentially applied to the first electrodes Y ₁ to Y _N , and the second signal S ₂ is simultaneously supplied to the second electrodes X ₁ to X _N . In addition, since other technical features of the driving method have been described in detail in the above embodiments, the details thereof will not be described herein.

In summary, in the touch device and the driving method thereof, a mask signal is transmitted to the shielding electrode, and one of the first signal of the first electrode and the second signal of the second electrode is shielded. The system is synchronized. Therefore, there is no potential difference between the shielding electrode and the first electrode or the second electrode, so that the capacitive effect of the shielding electrode and the first electrode or the second electrode is nearly zero, thereby reducing the sensing load of the touch device on the capacitor. In turn, the touch sensitivity of the touch device is improved. In addition, the shielding electrode can form a shadowing effect on the signal of the display panel, so that the signals between the display panel and the touch panel do not interfere with each other.

FIG. 12 is a block diagram showing an image display system according to an embodiment of the invention, which can be implemented in any of the above touch devices, such as a tablet personal computer, a projector, an e-book, a notebook computer, Mobile phones, digital cameras, personal digital assistants (PDAs), desktop computers, televisions, car displays, or portable DVD players. The input unit is coupled to the touch device for providing an input signal (eg, an image signal) to the touch device to cause the touch device to display an image.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . Touch display device

11. . . Display panel

12. . . Touch panel

13. . . Masking layer

2, 3, 4, 4a, 4b, 5a, 5b. . . Touch device

20, 30. . . Touch panel

21, 31. . . Substrate

22, 32, 42, 42a, 42b, X1 ~ XN. . . First electrode

23, 33, 43, 43a, 43b, Y1 ~ YN. . . Second electrode

24, 34. . . Sense drive circuit

25, 25a, 35, 45a, 45b. . . Masking electrode

251. . . Strip electrode

252. . . wire

26, 36, 46a, 46b. . . Insulation

451, 453. . . Main body

452, 454, B. . . Connection

57a, 57b. . . Display panel

571. . . Common electrode

C. . . Masking signal

S ₁ . . . First signal

S ₂ . . . Second signal

S01～S03. . . Steps to drive the method

1 is a schematic view of a conventional touch display device;

2 is an exploded perspective view of a touch device according to a preferred embodiment of the present invention;

3 is a side view of the touch device shown in FIG. 2;

4 to FIG. 6 are timing diagrams showing different aspects of the first signal, the second signal, and the masking signal according to the preferred embodiment of the present invention;

FIG. 7 is a side view of another touch device according to a preferred embodiment of the present invention; FIG.

8 is a top plan view of a first electrode and a second electrode of another touch device according to a preferred embodiment of the present invention;

9A and 9B are schematic side views of another touch device according to a preferred embodiment of the present invention;

10A to 10C are schematic diagrams showing different variations of a shielding electrode according to a preferred embodiment of the present invention;

FIG. 11 is a flow chart showing the steps of a method for driving a touch device according to a preferred embodiment of the present invention;

FIG. 12 is a block diagram of an image display system according to a preferred embodiment of the present invention.

2. . . Touch device

20. . . Touch panel

twenty one. . . Substrate

twenty two. . . First electrode

twenty three. . . Second electrode

twenty four. . . Sense drive circuit

25. . . Masking electrode

26. . . Insulation

Claims (21)

A touch device includes: a touch panel having: a substrate; a plurality of first electrodes disposed on the substrate and spaced apart from each other; and a plurality of second electrodes disposed on the substrate and spaced apart from each other; a shielding electrode disposed on one side of the substrate; and a sensing driving circuit that controls the signal of the shielding electrode to be synchronized with a signal of one of the first electrodes and the second electrodes, wherein The first electrode is in the same plane or a different plane as the two electrode systems. The touch device of claim 1, wherein the substrate is located between the shielding electrode and the first electrodes and the second electrodes, and the first electrodes and the second electrodes are located The same side or different sides of the substrate. The touch device of claim 1, wherein the first electrodes are disposed in parallel with each other, and the second electrodes are disposed in parallel with each other. The touch device of claim 1, wherein the first electrodes and the second electrodes are located on opposite sides of the substrate. The touch device of claim 1, wherein the first electrodes and the second electrodes are on the same side of the substrate, and an insulation is provided between the first electrodes and the second electrodes. Floor. The touch device of claim 1, wherein the shielding electrode is planar or strip-shaped. The touch device of claim 1, wherein the shielding electrode comprises a plurality of body portions and a plurality of connecting portions, and each of the connecting portions connects the two body portions. The touch device of claim 1, wherein the shielding layer is in the same plane as the first electrodes or the second electrodes. The touch device of claim 1, further comprising: a display panel disposed opposite to the substrate. The touch device of claim 9, wherein the display panel has a common electrode, and the shielding electrode is located between the common electrode and one of the first electrodes and the second electrodes. The touch device of claim 10, wherein the shielding electrode is disposed on the substrate. The touch device of claim 10, wherein the shielding electrode is disposed on the common electrode. The touch device of claim 1, wherein the sensing driving circuit transmits a first signal to the first electrodes, transmits a second signal to the second electrodes, and transmits a masking signal to The shielding electrode is synchronized with the one of the first signal and the second signal. A driving method of a touch device, wherein the touch device includes a plurality of first electrodes, a plurality of second electrodes, a shielding electrode, and a sensing driving circuit, wherein the sensing driving circuit respectively controls the first connection of the electrical connection An electrode, the second electrode, and the shielding electrode, the driving method includes: transmitting a first signal to the first electrodes; transmitting a second signal to the second electrodes; and transmitting a masking signal to the shielding The shielding signal is synchronized with one of the first signal and the second signal. The method of driving a touch device according to claim 14, wherein the first signal is sequentially applied to the first electrodes or simultaneously to the first electrodes. The method of driving a touch device according to claim 14, wherein the second signal is sequentially applied to the second electrodes or simultaneously to the second electrodes. The driving method of the touch device of claim 14, wherein one of the first signal and the second signal is substantially the same as the amplitude of the masking signal. The driving method of the touch device of claim 14, wherein the working period of the second signal overlaps with at least a portion of the working period of the first signal. The driving method of the touch device of claim 14, wherein the amplitude of the first signal is greater than the amplitude of the second signal. An image display system comprising: the touch device of claim 1; and an input unit coupled to the touch device for providing an input signal to the touch device Display images. The image display system of claim 20, wherein the image display system comprises: a tablet computer, a projector, an e-book, a notebook computer, a mobile phone, a digital camera, and a number of assistants. A desktop computer, a television set, a car display, or a portable DVD player.