Device and method for preventing the influence of conducting material from point detection of projected capacitive touch panel

This invention provides a device for preventing the influence of conducting material from point detection of projected capacitive touch panel. The device includes a first sensing layer having a plurality of first axial conductive lines isolated from each other and electrically connected to a plurality of first outside-connection conducting wires correspondingly, a second sensing layer having a plurality of second axial conductive lines isolated from each other and electrically connected to a plurality of second outside-connection conducting wires correspondingly, a signal driving line electrically connecting to the first and the second outside-connection conducting wires to provide a first sensing signal, and a sensing unit electrically connecting the first and the second outside-connection conducting wires to sense the sensing signal on the first and the second axial conductive lines. Wherein, the second sensing layer is on a dielectric layer, the first sensing layer, and a substrate in sequence.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention generally relates to the field of touch panel, and more particularly, to a device and method for preventing the influence of conducting material from point detection of projected capacitive touch panel.

2. Description of the Prior Art

Nowadays, the common touch technologies used by electronic devices include resistive, surface capacitive, projected capacitive, surface acoustic wave, optics imaging, infrared, bending wave, active digitizer, and so forth. Since the packaging volumes of the first three technologies are smaller, their precision can be done relatively high. And they are suitable to those smaller mobile device or portable consumer electronic products.

In terms of resistive touch technology, the techniques from pressing a touch screen to the contact detection, data operations, and the contact position confirmed have the technical limitations from the physical conditions. That is, in order to increase the detection area or resolution, it is necessary to increase the number of lines. However, the increase in the number of lines means that the data is also related increase in processing and computing. This causes a heavy load to the processor. In addition, touch-pressure mechanism is confirmed by the mechanical action completely, a PET film, no matter how to improve its pressure-resistance, wear-resistance, anti-deformation and so on, after all, the PET film has its limits. So the performance of the transparency is getting worse with the use of time and frequency. As for contact detection, some specific areas will be worn by excessively use, and thus, the conduction efficiency of an ITO conductive film is reduced. Besides, the ITO conductive film must reserve borders, and thus the optional of the industrial design is restricted. Still, the resistive touch technology is unable to achieve approach sense (fingers approach but not touch), as well as more difficult to deal with multi-touch.

Surface capacitive touch technology does not have to use the ITO conductive film with high-precision, so the touch side has no the similar mechanical structure like the resistive touch technology has. Thus, a surface capacitive touch screen will not be worn nor has a similar touch-mechanical fatigue which results in the sensitivity drop, and can also perform approach sense. However, the surface capacitive touch technology has the problem of hand-shadow effect. That is, when a surface capacitive touch screen is active, if user's wrist and fingers approach the screen surface together, it will make the surface of the ITO conductive film and the inside of the screen generate excessive charges. These excessive charges lead to produce coupling capacitance and make the surface capacitive touch screen sense error. Also, because the surface capacitive technology senses the contact by the change of the electric field, the accuracy of contact detection will be affected when the use of environment has the problem of electromagnetic interference. Still, after a prolonged use, the contact detection also easily offset, so regular or frequent calibration is required.

Referring toFIG. 1A, a three-dimensional decomposition diagram of a well-known projected capacitive touch panel100is depicted. The projected capacitive touch panel100at least includes a substrate110, a first sensing layer120, a dielectric layer130, a second sensing layer140, a bonding layer (not shown), and a protecting layer (not shown) from bottom-up to stack up with the same shape. Herein, these elements mentioned above are transparent. The first sensing layer120has a plurality of first patterned electrodes122serially connected by a plurality of first axial conductive lines124correspondingly, and then electrically connected to a plurality of first outside-connection conducting wires126correspondingly. The second sensing layer140has a plurality of second patterned electrodes142serially connected by a plurality of second axial conductive lines144correspondingly, and then electrically connected to a plurality of second outside-connection conducting wires146correspondingly. In the present diagram, the axial direction of the first axial conductive lines124is Y-axial and the axial direction of the second axial conductive lines144is X-axial, but not limited to, the first axial direction could also be X-axial and the second axial direction could be Y-axial as well.

Referring toFIG. 1B, the active circuit150of the projected capacitive touch panel100shown inFIG. 1Ais depicted. A plurality of first and second outside-connection conducting wires126,146electrically connect to a sensing unit160. The relations among the first and the second patterned electrodes122,142, the first and the second axial conductive lines124,144, and the first and the second outside-connection conducting wires126,146are described inFIG. 1A, and shall not be repeated here. When the circuit is active, the sensing unit160sequentially provides a sensing signal to every first axial conductive line124by each corresponding first outside-connection conducting wire126, and then sequentially provides the sensing signal to every second axial conductive line144by each corresponding second outside-connection conducting wire146. In the meanwhile, the first and the second axial conductive lines122,144which do not receive the sensing signal are electrically connected to ground or a fixed voltage level. Since the stray capacitance exists between the first and the second axial conductive lines124,144, when a user uses his/her finger or conducting material to approach or touch a touch point TP on the projected capacitive touch panel100, the finger or the conducting material on the touch point TP forms an extra capacitance with the first and the second axial conductive lines124,144. This causes the value of the equivalent capacitance to be changed. The sensing unit160senses the relatively bigger change of corresponding current or charges to decide the position of the touch point, such as (X3, Y5). In short, the measuring control circuit sequentially drives a sensing signal to each first and second axial conductive line, and senses the relatively bigger change of corresponding current or charges generated by driving the sensing signal to decide the position of the point. Wherein, when any axial conductive line is driven by the sensing signal and is sensed to get its current change or charge change, other axial conductive lines are electrically connected to ground or a fixed voltage level to make the effect of stray capacitance consistent.

However, when the projected capacitive touch panel100has a conducting material area OZ on, such as water or other conducting material, the equivalent circuit and the equivalent stray capacitance between the axial conductive lines on the conducting material area OZ will be changed. This change makes the measuring control circuit, such as sensing unit160, sense the current change or charge change on the axial conductive lines, and then results in misjudgment and mal-operation. Or, when the axial conductive line related to the touch point TP is provided the sensing signal and is sensed change in current or charges, the current change or the charge change are affected by the conducting material area OZ. That is, those relatively bigger changes of the current or charges are bypassed to the adjacent axial conductive line to ground through the conducting material area OZ. Therefore, the position of the touch point TP cannot be correctly sensed.

In view of the drawbacks mentioned with the prior art of touch point detection, there is a continuous need to develop a new and improved device and method for touch point detection that overcomes the shortages associated with the prior art. The advantages of the present invention are that it solves the problems mentioned above.

SUMMARY OF THE INVENTION

In accordance with the present invention, a device and method for preventing the influence of conducting material from point detection of projected capacitive touch panel substantially obviates one or more of the problems resulted from the limitations and disadvantages of the prior art mentioned in the background.

One of the purposes of the present invention is to provide a sensing signal to the axial conductive lines of a touch panel, whereby the current and charges among the axial conductive lines can be eliminated.

The present invention provides a device for preventing the influence of conducting material from point detection of projected capacitive touch panel. The device includes a first sensing layer having a plurality of first axial conductive lines isolated from each other and electrically connected to a plurality of first outside-connection conducting wires correspondingly, a second sensing layer having a plurality of second axial conductive lines isolated from each other and electrically connected to a plurality of second outside-connection conducting wires correspondingly, a signal driving line electrically connecting to the first and the second outside-connection conducting wires to provide a first sensing signal, and a sensing unit electrically connecting the first and the second outside-connection conducting wires to sense the sensing signal on the first and the second axial conductive lines. Wherein, the second sensing layer is on a dielectric layer, the first sensing layer, and a substrate in sequence.

The present invention provides a method for preventing the influence of conducting material from point detection of projected capacitive touch panel. The method includes (a) providing a first sensing signal to a plurality of first and second axial conductive lines, wherein the first and second axial conductive lines are electrically isolated from each other; (b) sensing a plurality of second and third sensing signals simultaneously, wherein the second and the third sensing signals are correspondingly generated by the first and the second axial conductive lines receiving the first sensing signal respectively; and (c) utilizing at least one bigger change of the second and the third sensing signals respectively to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate.

The present invention provides a method for preventing the influence of conducting material from point detection of projected capacitive touch panel. The method includes (a) providing a first sensing signal to a plurality of first and second axial conductive lines, wherein the first and second axial conductive lines are electrically isolated from each other; (b) sensing a plurality of second sensing signals; (c) sensing a plurality of third sensing signals, wherein the second and the third sensing signals are correspondingly generated by the first and the second axial conductive lines receiving the first sensing signal respectively; and (d) utilizing at least one bigger change of the second and the third sensing signals respectively to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate.

The present invention provides a method for preventing the influence of conducting material from point detection of projected capacitive touch panel. The method includes (a) providing a first sensing signal to a plurality of first axial conductive lines, wherein the first axial conductive lines are electrically isolated from each other; (b) sensing a plurality of second sensing signals of the first axial conductive lines and a plurality of third sensing signals of a plurality of second axial conductive lines, wherein the second axial conductive lines are electrically isolated from each other and are isolated from the first axial conductive lines, the second and the third sensing signals are correspondingly generated by the first and the second axial conductive lines receiving the first sensing signal and capacitively coupling the second sensing signals respectively; and (c) utilizing at least one bigger change of the second and the third sensing signals respectively to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate.

The present invention provides a method for preventing the influence of conducting material from point detection of projected capacitive touch panel. The method includes (a) providing a first sensing signal to a plurality of first axial conductive lines, wherein the first axial conductive lines are electrically isolated from each other; (b) sensing a plurality of second sensing signals of the first axial conductive lines; (c) sensing a plurality of third sensing signals of a plurality of second axial conductive lines, wherein the second axial conductive lines are electrically isolated from each other and are isolated from the first axial conductive lines, the second and the third sensing signals are correspondingly generated by the first and the second axial conductive lines receiving the first sensing signal and capacitively coupling the second sensing signals respectively; and (d) utilizing at least one bigger change of the second and the third sensing signals respectively to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate.

The present invention provides a method for preventing the influence of conducting material from point detection of projected capacitive touch panel. The method includes (a) providing a first sensing signal to a plurality of first axial conductive lines, wherein the first axial conductive lines are electrically isolated from each other; (b) sensing a plurality of second sensing signals of a plurality of second axial conductive lines, wherein the second axial conductive lines are electrically isolated from each other and are isolated from the first axial conductive lines; (c) sensing a plurality of third sensing signals of the first axial conductive lines, wherein the second sensing signals are correspondingly generated by the second axial conductive lines capacitively coupling the third sensing signals, the third sensing signals are correspondingly generated by the first axial conductive lines receiving the first sensing signal; and (d) utilizing at least one bigger change of the second and the third sensing signals respectively to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Some embodiments of the present invention will now be described in greater detail. Nevertheless, it should be noted that the present invention can be practiced in a wide range of other embodiments besides those explicitly described, and the scope of the present invention is expressly not limited except as specified in the accompanying claims.

Moreover, some irrelevant details are not drawn in order to make the illustrations concise and to provide a clear description for easily understanding the present invention.

Referring toFIG. 2A, an active circuit200of one preferred embodiment in accordance with the present invention is depicted. A projected capacitive touch panel100(referring toFIG. 1A) at least includes a first sensing layer120and a second sensing layer140. The first sensing layer120has a plurality of first axial conductive lines124isolated from each other and correspondingly electrically connected to a plurality of first outside-connection conducting wires126. Herein, the first sensing layer120further has a plurality of first patterned transparent electrodes122serially connected to the first axial conductive lines124in cycle. The second sensing layer140has a plurality of second axial conductive lines144isolated from each other and correspondingly electrically connected to a plurality of second outside-connection conducting wires146. Herein, the second sensing layer120further has a plurality of second patterned transparent electrodes142serially connected to the second axial conductive lines144in cycle. Wherein, the second sensing layer140is on a dielectric layer130, the dielectric layer130is on the first sensing layer120, the first sensing layer120is on a substrate110, and a bonding layer (not shown) and a protecting layer (not shown) are on the second sensing layer140. In this embodiment, the first sensing layer120, the first patterned electrodes122, the first axial conductive lines124, the second sensing layer140, the second patterned electrodes142, the second axial conductive lines144, the substrate110, the dielectric layer130, the bonding layer and the protecting layer are transparent material. Besides, the axial direction of the first axial conductive lines124is Y-axial and the axial direction of the second axial conductive lines144is X-axial. The axial directions of the first and the second axial conductive lines124,144, however, could be X-axial and Y-axial, respectively. Or, the axial directions of the two axial conductive lines124,144are not perpendicular to each other.

Referring toFIG. 2Aagain, a signal driving line232electrically connects to the first and the second outside-connection conducting wires126,146and a control switch230to receive and transmit a first sensing signal Vref. Herein, the first end of the control switch230electrically connects to the signal driving line232, and its third end236receives a control signal CS to control the first sensing signal Vref received by its second end234. Then the first sensing signal Vref is transmitted to the first and the second outside-connection conducting wires126,146. A sensing unit220electrically connects to the first and the second outside-connection conducting wires126,146through a multiplexer210to sense the sensing signals on the correspondingly electrical connections of the first and the second axial conductive lines124,126. In this embodiment, the control switch230could be an electronic switch (such as BJT, CMOS or photo-coupler) or could be an electromechanical switch (such as electromagnetic reed switch). The sensing unit220could be a current detector or a charge detector. The number of the multiplexer210and the sensing unit220could be increased or decreased depend on the limit of total cost and the speed of touch position sensing. This part, however, can be figured out by those skilled in the art according to the present embodiment. Thus, no more detail will be described.

Referring toFIG. 2Aagain, when the control switch230receives the control signal CS to make itself close, the first and the second outside-connection conducting wires126,146receive the first sensing signal Vref by the signal driving line232. This makes the entire first and second axial conductive lines124,144have the same voltage level, the first sensing signal Vref. In the meantime, there is no voltage difference among the first and the second axial conductive lines124,144, so there is no current loop among them as well. If a conducting material area OZ exists on the projected capacitive touch panel100in the meanwhile, the conducting material area OZ will not form current loops with the first and the second axial conductive lines124,144because there is no voltage difference among the first and the second axial conductive lines124,144. Therefore, the conducting material area OZ does not change the current among the first and the second axial conductive lines124,144. In the present invention, the conducting material area OZ means those conducting material areas existing on the protecting layer of the touch panel (such as water, other conducting material etc.) before a user uses his/her finger or other conducting material to touch the touch panel.

When a user uses his/her finger or conducting material to approach or touch a touch point TP2on the projected capacitive touch panel100, the axial conductive lines124,144and the outside-connection conducting wires126,146related to the touch point TP2, such as X7, X8and Y4, Y5, have current formed on them, because the touch point TP2forms a loop to ground through the user body. When the sensing unit220senses each outside-connection conducting wire126,146, the current or the charge change on the outside-connection conducting wires126,146(X7, X8, Y4, Y5) can be sensed. If the current change or the charge change on X8is bigger than those on X7, and the current change or the charge change on Y5is bigger than those on Y4, that means the touch point TP2near the coordinate position (X8, Y5).

When a user uses his/her finger or conducting material to approach or touch a touch point TP1on the projected capacitive touch panel100, the axial conductive lines124,144and the outside-connection conducting wires126,146related to the touch point TP1and the conducting material area OZ, such as X2, X3and Y2, Y3, will not be affected by the conducting material area OZ. That is, the axial conductive lines124,144and the outside-connection conducting wires126,146have the same voltage level, so when the touch point TP1causes bigger current or charge changes on X2, Y3of the outside-connection conducting wires126,146, the bigger current and charge will not be bypassed to ground through X3, Y2of the outside-connection conducting wires126,146. Thus, the position of the touch point TP1still can be sensed exactly. What is emphasized here is the coordinate system used above being only to explain the relation between the axial conductive lines124,144of the present embodiment and their corresponding coordinate system. It is not to limit the coordinate system of the embodiments in accordance with the present invention. Besides, those skilled in the art could easily figure out that the position of each touch point can be calculated out through at least one axial conductive line near the touch point. For example: the interpolation uses the current or charge change of the axial conductive line near the touch point as weight, referring to the coordinate of the axial conductive line near the touch point, and calculates out the center of mass.

Moreover, the above-mentioned embodiments only use one conducting material area OZ and one touch point TP1or TP2as explanations. When there are many conducting material areas and touch points existing, the embodiments mentioned above are still available. This part can be figured out by those skilled in the art according to those embodiments, and thus, no more detail will be described.

Referring toFIG. 3A, a flow chart of a preferred embodiment in accordance with the present invention is depicted. Please also refer toFIG. 2Aat the same time. In step302, providing a first sensing signal Vref to a plurality of first axial conductive lines124concurrently and a plurality of second axial conductive lines144concurrently. Herein, the plurality of first and second axial conductive lines124,144are electrically isolated from each other. In step304, the sensing unit220simultaneously senses a plurality of second and third sensing signals of the plurality of first and second axial conductive lines124,144. Herein, the plurality of second and third sensing signals are correspondingly generated by the plurality of first and second axial conductive lines124,144receiving the first sensing signal Vref. In step306, the sensing unit220respectively uses at least one bigger change of the plurality of second and third sensing signals to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate. In the present embodiment, the first axial conductive lines124are X-axial, the second axial conductive lines144are Y-axial, and the corresponding coordinate is an X-Y perpendicular coordinate. Herein, the first and the second axial conductive lines124,144include transparent material. A transparent dielectric layer is inserted between and used to isolate the first and the second axial conductive lines124,144. The first sensing signal Vref is provided by a voltage-sensing source or a current-sensing source, and the sensing unit220could include at least one current detector or at least one charge detector.

Referring toFIG. 3B, a flow chart of another preferred embodiment in accordance with the present invention is depicted. Please also refer toFIG. 2Aat the same time. In step312, providing a first sensing signal Vref to a plurality of first axial conductive lines124at once and a plurality of second axial conductive lines144at the same time. Herein, the plurality of first and second axial conductive lines124,144are electrically isolated from each other. In step314, the sensing unit220senses a plurality of second sensing signals of the plurality of first axial conductive lines124. Herein, the plurality of second sensing signals are correspondingly generated by the plurality of first axial conductive lines124receiving the first sensing signal Vref. In step316, the sensing unit220senses a plurality of third sensing signals of the plurality of second axial conductive lines144. Herein, the plurality of third sensing signals are correspondingly generated by the plurality of second axial conductive lines144receiving the first sensing signal Vref. In step318, the sensing unit220respectively uses at least one bigger change of the plurality of second and third sensing signals to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate. In the present embodiment, the first axial conductive lines124are X-axial, the second axial conductive lines144are Y-axial, and the corresponding coordinate is an X-Y perpendicular coordinate. Or, the first axial conductive lines124are Y-axial; the second axial conductive lines144are X-axial. Herein, the first and the second axial conductive lines124,144include transparent material. A transparent dielectric layer is inserted between and used to isolate the first and the second axial conductive lines124,144. The first sensing signal Vref is provided by a voltage-sensing source or a current-sensing source, and the sensing unit220could include at least one current detector or at least one charge detector.

The two above-mentioned embodiments, referring toFIGS. 3A and 3B, in sensing the second and the third sensing signals of the first and the second axial conductive lines124,144, whatever their sensing methods are simultaneous or consecutive, their sensing steps could be sensing the second sensing signals of the first axial conductive lines124in sequence and sensing the third sensing signals of the second axial conductive lines144in order. Herein, every first axial conductive line124is sensed in sequence and every second axial conductive line144is sensed in order. Or, several first axial conductive lines124are sensed in sequence and several second axial conductive lines144are sensed in order. In addition, their sensing steps could also be sensing the second sensing signals of the first axial conductive lines124by selected and sensing the third sensing signals of the second axial conductive lines144by selected. That is, their sensing steps do not process in order, such as interlaced scanning. Likewise, every first axial conductive line124could be sensed by selected and every second axial conductive line144could be sensed by selected. Or, several first axial conductive lines124are sensed by selected and several second axial conductive lines144are sensed by selected.

The inventor emphasizes that the active circuit of the preferred embodiment shown inFIG. 2Amust be fixed to match the flow charts of the preferred embodiments illustrated inFIGS. 3C and 3D. That is, the signal driving line232only electrically connects to a plurality of first outside-connection conducting wires126, as shown inFIG. 2B, or only electrically connects to a plurality of second outside-connection conducting wires146, as shown inFIG. 2C. By doing so, the first sensing signal Vref is driven on the first axial conductive lines124only or on the second axial conductive lines144only to match the flow charts depicted inFIGS. 3C and 3D.

Referring toFIG. 3C, a flow chart of further another preferred embodiment in accordance with the present invention is depicted. Please also refer toFIG. 2Aall at once. In step322, providing a first sensing signal Vref to a plurality of first axial conductive lines124concurrently. Herein, the plurality of first axial conductive lines124are electrically isolated from each other. In step324, the sensing unit220senses a plurality of sensing signals (second sensing signals) of the plurality of first axial conductive lines124and a plurality of sensing signals (third sensing signals) of a plurality of second axial conductive lines144simultaneously. Herein, the plurality of second axial conductive lines144are electrically isolated from each other and are isolated from the first axial conductive lines124. The plurality of second sensing signals are correspondingly generated by the plurality of first axial conductive lines124receiving the first sensing signal Vref, and the plurality of third sensing signals are correspondingly generated by the plurality of second axial conductive lines144capacitively coupling the second sensing signals. In step326, the sensing unit220respectively uses at least one bigger change of the plurality of second and third sensing signals to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate. In the present embodiment, the plurality of third sensing signals includes the stray capacitance between the first and the second axial conductive lines124,144.

Referring toFIG. 3D, two flow charts of still other preferred embodiments in accordance with the present invention is depicted. Please also refer toFIG. 2Aall at once. In step332, providing a first sensing signal Vref to a plurality of first axial conductive lines124all together. Herein, the plurality of first axial conductive lines124are electrically isolated from each other. In step334A, the sensing unit220senses a plurality of sensing signals (second sensing signals) of the plurality of first axial conductive lines124. Herein, the plurality of second sensing signals are correspondingly generated by the plurality of first axial conductive lines124receiving the first sensing signal Vref. In step336A, the sensing unit220senses a plurality of sensing signals (third sensing signals) of a plurality of second axial conductive lines144. Herein, the plurality of second axial conductive lines144are electrically isolated from each other and are isolated from the first axial conductive lines124. The plurality of third sensing signals are correspondingly generated by the plurality of second axial conductive lines144capacitively coupling the second sensing signals. In step338, the sensing unit220respectively uses at least one bigger change of the plurality of second and third sensing signals to match a corresponding coordinate to get the position of at least one touch point on the corresponding coordinate. In the present embodiment, the plurality of third sensing signals includes the stray capacitance between the first and the second axial conductive lines124,144.

Referring toFIG. 3Dagain, and also refer toFIG. 2Aall at once. The step334B continues the step332. In step334B, the sensing unit220senses a plurality of sensing signals (second sensing signals) of a plurality of second axial conductive lines144. Herein, the plurality of second axial conductive lines144are electrically isolated from each other and are isolated from the first axial conductive lines124. In step336B, the sensing unit220senses a plurality of sensing signals (third sensing signals) of the plurality of first axial conductive lines124. Herein, the plurality of third sensing signals are correspondingly generated by the plurality of first axial conductive lines124receiving the first sensing signal Vref. The plurality of second sensing signals are correspondingly generated by the plurality of second axial conductive lines144capacitively coupling the third sensing signals. The next step338is described above, so it is not necessary to be repeated here. In the present embodiment, the plurality of second sensing signals includes the stray capacitance between the first and the second axial conductive lines124,144.

In three above-mentioned preferred embodiments shown inFIGS. 3C and 3D, the axial direction of the first axial conductive lines124include X-axial, the axial direction of the second axial conductive lines144includes Y-axial, and the corresponding coordinate is an X-Y perpendicular coordinate. Or, the axial direction of the first axial conductive lines124includes Y-axial; the axial direction of the second axial conductive lines144includes X-axial. Herein, the first and the second axial conductive lines124,144include transparent material. A transparent dielectric layer is inserted between and used to isolate the first and the second axial conductive lines124,144. The first sensing signal Vref is provided by a voltage-sensing source or a current-sensing source, and the sensing unit220could include at least one current detector or at least one charge detector.

Moreover, the three above-mentioned preferred embodiments, referring toFIGS. 3C and 3D, in sensing the sensing signals of the first and the second axial conductive lines124,144, whatever their sensing methods are simultaneous or consecutive, their sensing steps could be sensing the sensing signals of the first axial conductive lines124in sequence and sensing the sensing signals of the second axial conductive lines144in order. Herein, every first axial conductive line124is sensed in sequence and every second axial conductive line144is sensed in order. Or, several first axial conductive lines124are sensed in sequence and several second axial conductive lines144are sensed in order. In addition, their sensing steps could also be sensing the sensing signals of the first axial conductive lines124by selected and sensing the sensing signals of the second axial conductive lines144by selected. That is, their sensing steps do not process in order, such as interlaced scanning. Similarly, every first axial conductive line124could be sensed by selected and so does every second axial conductive line144.

Or, several first axial conductive lines124could be sensed by selected and so do several second axial conductive lines144.