WO2013013636A1 - Touch detecting assembly, touch sensitive device and portable electronic apparatus - Google Patents
Touch detecting assembly, touch sensitive device and portable electronic apparatus Download PDFInfo
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- WO2013013636A1 WO2013013636A1 PCT/CN2012/079223 CN2012079223W WO2013013636A1 WO 2013013636 A1 WO2013013636 A1 WO 2013013636A1 CN 2012079223 W CN2012079223 W CN 2012079223W WO 2013013636 A1 WO2013013636 A1 WO 2013013636A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0448—Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
Definitions
- both the first electrode 210 and the second electrode 220 of each induction unit 200 are located at the first side 110 of the substrate 100.
- a touch position on a touch screen may be obtained.
- a finger or other objects will touch a plurality of induction units 200.
- the control chip 400 may first obtain a touch position on each of the plurality of induction units 200 touched, and then a final touch position on the touch screen may be calculated by averaging.
- control chip 400 is configured to apply level signals to the first electrode
- a portable electronic device may comprise the touch detection assembly 300 according to the above-mentioned embodiments of the present discourse.
- a portable electronic device according to an embodiment of the present discourse may comprise the touch sensitive device according to the above-mentioned embodiments of the present discourse.
- Other constructions such as a structure, a control and an operation of the portable electronic device according to an embodiment of the present discourse are obvious to those skilled in the art and will not be described in detail here.
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Position Input By Displaying (AREA)
- Electronic Switches (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
A touch detecting assembly, a touch sensitive device and a portable electronic apparatus are provided. The touch sensitive device comprises a touch detecting assembly (300) and a control chip (400). The touch detecting assembly (300) comprises a substrate (100); and a plurality of induction units (200) disposed on the substrate (100) and not intersecting with each other. Each induction unit (200) comprises: a first part (230); and a second part (240) and a third part (250) not intersecting with each other. One end of the second part (240) is connected with one end of the first part (230), one end of the third part (250) is connected with the other end of the first part (230), the other end of the second part (240) comprises a first electrode (210), and the other end of the third part (250) comprises a second electrode (220).
Description
TOUCH DETECTING ASSEMBLY, TOUCH SENSITIVE DEVICE AND PORTABLE
ELECTRONIC APPARATUS
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority to and benefits of the following applications:
1) Chinese Patent Application Serial No. 201110210959.4, filed with the State Intellectual Property Office of P. . China on July 26, 2011;
2) Chinese Patent Application Serial No. 201110211018.2, filed with the State Intellectual Property Office of P. R. China on July 26, 2011; and
3) Chinese Patent Application Serial No. 201110459449.0, filed with the State Intellectual
Property Office of P. R. China on December 31, 2011.
The entire contents of the above applications are incorporated herein by reference.
FIELD
The present disclosure relates to an electronic apparatus design and fabrication field, and more particularly to a touch detecting assembly, a touch sensitive device and a portable electronic apparatus.
BACKGROUND
Currently, a touch detecting assembly (i.e., a touch screen) has been spread from being used in a small minority commercial market such as an ATM in a bank and an industrial control computer quickly to being applied in mass consumption electronic apparatuses, such as mobile phones, PDA (personal digital assistant), GPS (global positioning system), PMP (such as MP3 or MP4) and panel computers. The touch screen, which has advantages of simple, convenient and humanized touch operations, will be a best human-computer interaction interface and be widely applied in portable apparatuses.
A capacitance touch detecting assembly is generally divided into two types: self-capacitance type and mutual-capacitance type. Fig. 1 is a schematic structural view of a conventional self capacitor touch detecting assembly. The self-capacitance type touch detecting assembly comprises a plurality of induction units 100' and 200' which have a diamond structure and are located in two different layers. A scanning is conducted along an X axis and a Y axis respectively, and if a capacitance variation of a certain intersection point exceeds a predetermined range, the intersection point is made as a touch
point. Although a linearity of the self-capacitance type touch detecting assembly is good, ghost touch points still appear frequently, and thus it is difficult to realize a multipoint touch. In addition, since a double-layer screen is used, the structure is complicated and the cost is increased. Moreover, under a condition of a slight capacitance variation, the diamond structure may cause a coordinate drift, that is, the diamond structure may be easily affected by an external factor.
Fig. 2a is a schematic structural view of another conventional self capacitor touch detecting assembly. The self-capacitance type touch detecting assembly uses a triangular screen structure. The self-capacitance type touch detecting assembly comprises: a substrate 300', a plurality of triangular induction units 400' disposed on the substrate 300', and a plurality of electrodes 500' connected with the triangular induction units 400' respectively. Fig. 2b shows a detecting principle of the self-capacitance type touch detecting assembly shown in Fig. 2a. As shown in Fig. 2b, an ellipse represents a finger which contacts with two adjacent triangular induction units, SI represents a contact area between the finger and one of the two adjacent triangular induction units, and S2 represents a contact area between the finger and the other. Provided that an origin of coordinate is located at the lower-left corner, an X coordinate may be obtained by X=S2/(S 1+S2)*P, where P is a resolution ratio. When the finger moves rightwards, because S2 does not increase linearly, there is a deviation of the X coordinate. It may be known from the detecting principle that a single end detecting is conducted for the conventional triangular induction unit, that is, the detecting is conducted only from one direction, and coordinates in the two directions are calculated by an algorithm. Although the self-capacitance type touch detecting assembly has a simple structure, an induction capacitance of the screen is not optimized, so that the capacitance variation is small, thus reducing a signal-to-noise ratio. In addition, because each induction unit has a triangular shape, when the figure moves horizontally, the contact area may not increase linearly, thus causing the deviation of the X coordinate and a poor linearity accordingly.
In addition, because the capacitance variation of a conventional capacitance induction unit is small to a femtofarad order of magnitude, a measure circuit needs to satisfy a higher requirement because of an existence of a stray capacitance. Moreover, because the stray capacitance may vary because of many factors, such as temperature, position, and distribution of internal and external electric fields, the stray capacitance may interfere with or even bury a tested capacitance signal. In addition, for a single-layer capacitance, because the induction capacitance may be seriously interfered by an influence of a level signal Vcom, which is used for preventing a liquid crystal of a LCD
screen from aging.
SUMMARY
Embodiments of the present disclosure seek to solve at least one of the problems existing in the prior art to at least some extent, particularly to solve at least one defects of a conventional self capacitor detecting assembly.
According to a first aspect of the present disclosure, a touch sensitive device is provided. The touch sensitive device comprises a touch detecting assembly and a control chip. The touch detecting assembly comprises a substrate; and a plurality of induction units disposed on the substrate and not intersecting with each other. Each induction unit comprises: a first part; and a second part and a third part not intersecting with each other. One end of the second part is connected with one end of the first part, one end of the third part is connected with the other end of the first part, the other end of the second part comprises a first electrode, and the other end of the third part comprises a second electrode. The first electrodes and the second electrodes of the plurality of induction units are connected with corresponding pins of the control chip; and the control chip is configured to apply a level signal to each first electrode and/or each second electrode to charge a self capacitor generated by a touch on at least one induction unit, to calculate a ratio between a first resistor between a first electrode of the at least one induction unit and the self capacitor and a second resistor between a second electrode of the at least one induction unit and the self capacitor when the at least one induction unit is detected by the control chip to be touched, and to calculate a coordinate of a touch point according to the at least one induction unit touched and the ratio between the first resistor and the second resistor.
According to a second aspect of the present disclosure, a touch detecting assembly is provided. The touch detecting assembly comprises: a substrate; and a plurality of induction units disposed on the substrate and not intersecting with each other. Each induction unit comprises: a first part; and a second part and a third part not intersecting with each other. One end of the second part is connected with one end of the first part, one end of the third part is connected with the other end of the first part, the other end of the second part comprises a first electrode, and the other end of the third part comprises a second electrode.
Detections are performed at two ends of each induction unit in the touch detecting assembly according to an embodiment of the present disclosure. The two ends of the induction unit have electrodes respectively and each electrode is connected with a corresponding pin of the control chip.
When the touch detection is performed, the touch position may be determined on the induction unit.
In addition, with the substantial U-shaped induction unit in the touch detecting assembly according to an embodiment of the present disclosure, a structure complexity of a device may be reduced and the device is easy to manufacture. All the electrodes are located at the same side, which are easy to manufacture, thus reducing a manufacturing cost.
More importantly, the touch position is determined according to the ratio between the first resistor and the second resistor. Compared with the conventional diamond or triangular designs, the self capacitor doesn't need to be calculated when determining the touch position, and the magnitude of the self capacitor will not influence a precision of the touch position, and thus the self capacitor detection doesn't need to be as precise as before and the detecting precision and the linearity may be improved. In addition, since any one of the first part, the second part and the third part of each induction unit may have a regular rectangular shape, compared with the conventional diamond or triangular designs, the linearity may be further improved.
According to an embodiment of the present discourse, level signals are applied to electrodes of the induction unit at both ends of the induction unit. A self capacitor may be formed when the induction unit is touched. Therefore, the self capacitor may be charged by the applied level signals and a touch position may be determined according to a ratio between the first resistor and the second resistor. For example, in one embodiment, the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when charging/discharging the self capacitor. Therefore, the first detecting value and the second detecting value may be detected from the first electrode and/or the second electrode when charging or discharging the self capacitor. Thus, the first detecting value and the second detecting value may reflect the touch position on the induction unit, and the touch position on the induction unit may be further determined.
The touch sensitive device according to an embodiment of the present disclosure adopts a novel self capacitor detecting method. When the induction unit is touched, a self capacitor is generated at the touch position on the touch sensitive device, and the touch position may divide the induction unit into two resistors. When the self capacitor detection is performed, the touch position on the induction unit may be determined by taking into account the two resistors. The touch sensitive device according to an embodiment of the present disclosure is simple in structure. Moreover, for one induction unit, the charging or discharging may be performed from the first electrode and/or the second electrode of the
one induction unit, and the detection may be performed during the charging and/or discharging, which may not only reduce a C constant, save time and improve an efficiency, but also ensure that a coordinate may not drift. In addition, with the touch sensitive device according to an embodiment of the present disclosure, a signal-to-noise ratio of a circuit may be effectively enhanced, a noise of the circuit may be reduced, and a linearity of an induction may be improved. Furthermore, because the induction unit touched is charged during the detection, small current may be generated in the induction unit touched, and an influence of a level signal Vcom on the self capacitor generated by a touch on an induction unit on the touch screen may be eliminated. Accordingly, a screen shielding layer and related procedures may be eliminated, thus further reduce a cost while enhancing an anti-interference capability.
According to a third aspect of the present disclosure, a portable electronic apparatus is provided. The portable electronic apparatus comprises a touch sensitive device according to the first aspect of the present disclosure.
According to a fourth aspect of the present disclosure, a portable electronic apparatus is provided. The portable electronic apparatus comprises a touch detecting assembly according to the second aspect of the present disclosure.
Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the accompanying drawings, in which:
Fig. 1 is a schematic structural view of a conventional self capacitor touch detecting assembly;
Fig. 2a is a schematic structural view of another conventional self capacitor touch detecting assembly;
Fig. 2b is a diagram showing a detecting principle of the another conventional self capacitor touch detecting assembly shown in Fig. 2a;
Fig. 3 is a diagram showing a detecting principle of a touch sensitive device according to an embodiment of the present disclosure;
Fig. 4a is a schematic view of a touch detecting assembly according to an embodiment of the present disclosure;
Fig. 4b is a schematic view of a touch detecting assembly according to another embodiment of the present disclosure;
Fig. 5 is a schematic view showing that an induction unit of a touch detecting assembly is touched according to an embodiment of the present disclosure; and
Fig. 6 is a schematic view of a touch sensitive device according to an embodiment of the present disclosure. DETAILED DESCRIPTION
Reference will be made in detail to embodiments of the present disclosure. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions.
The touch sensitive device according to an embodiment of the present disclosure adopts a self capacitor detecting method. When the induction unit is touched, a self capacitance is generated at the touch position on the touch sensitive device, and the touch position may divide the induction unit into two resistors. When the self capacitor detection is performed, the touch position on the induction unit may be determined by taking into account the two resistors. Fig. 3 is a diagram showing a detecting principle of a touch sensitive device according to an embodiment of the present disclosure. When a finger touches the induction unit, the induction unit is divided into the first resistor Rl and the second resistor R2, and a ratio between Rl and R2 is related to the touch position. For example, as shown in Fig. 3, when the touch position is closer to the first electrode 210, the first resistor Rl is comparatively small and the second resistor R2 is comparatively large; in contrast, when the touch position is closer to the second electrode 220, the first resistor Rl is comparatively large and the second resistor R2 is comparatively small. Therefore, by detecting the first resistor Rl and the second resistor R2, the touch position on the induction unit may be determined.
In some embodiments, the first resistor Rl and the second resistor R2 may be determined in various ways, for example, by detecting one or more of a current detecting value, a self capacitance detecting value, a level signal detecting value and a charge variation, and the first resistor Rl and the
second resistor 2 may be obtained based on the above detecting values. In addition, in some embodiments, the above detecting values may be detected when charging the self capacitor (i.e., obtaining the first charging detecting value and the second charging detecting value), or may be detected when discharging the self capacitor (i.e., obtaining the first discharging detecting value and the second discharging detecting value). In addition, various ways may be adopted to perform the detection during the charging or discharging.
It should be noted that at least one of the charging, discharging and detection is performed from the first electrode and the second electrode so as to obtain two detecting values reflecting a difference between the first resistor and the second resistor, i.e., the first detecting value and the second detecting value. That is, during the charging, discharging and detection, there is a need for a current flowing through the first resistor and the second resistor so that the first detecting value and the second detecting value detected may reflect the difference between the first resistor and the second resistor.
In some embodiments, the charging and the detection are generally needed to be performed twice, and the charging comprises the charging from the first electrode and the second electrode simultaneously. In some embodiments, the discharging may be performed twice. For convenience, the charging and the detection are each performed twice in the following embodiments. It should be noted that performing the charging and detection twice is only an example with a comparatively simple algorithm for realizing the embodiments. However, those skilled in the art may increase a number of times of the charging and detection, for example, the charging and the detection may be performed three times, then the first resistor is calculated according to the first time charging detecting value and the second time charging detecting value, and the second resistor is calculated according to the first time charging detecting value and the third time charging detecting value.
Specifically, according to an embodiment of the present disclosure, the detecting methods may include, but are not limited to, the following methods.
1. level signals are applied to the first electrode and the second electrode of the induction unit to charge the self capacitor (the self capacitor is generated when the induction unit is touched); and then a charging detection is performed from the first electrode and/or the second electrode to obtain a first charging detecting value and a second charging detecting value. In this embodiment, since the charging is performed from the first electrode and the second electrode, the detection may be performed from the first electrode, from the second electrode or from the first electrode and the second electrode respectively.
It should be noted that in this embodiment, charging from the first electrode and from the second electrode may be performed simultaneously or separately. For example, a same level signal may be applied to the first electrode and the second electrode simultaneously to charge the self capacitor. In other embodiments, the level signals applied to the first electrode and the second electrode may be different; or one level signal may be applied to the first electrode first and then an identical or different level signal may be applied to the second electrode. Similarly, the detections from the first electrode and the second electrode may be performed simultaneously or separately. In the following embodiments, the detection and the charging may be performed simultaneously or separately, and the detection and the discharging may be performed simultaneously or separately.
2. A level signal is applied to the first electrode or the second electrode of the induction unit twice to charge the self capacitor twice; and after each charging, a charging detection is performed from the first electrode and/or the second electrode to obtain a first charging detecting value and a second charging detecting value. In the embodiment, since the charging is performed from the first electrode or the second electrode, the detection needs to be performed from the first electrode and the second electrode respectively. It should be noted that charging from the first electrode and from the second electrode may be performed simultaneously or separately.
In addition, alternatively, charging may be performed from the first electrode twice and detection may be performed from the first electrode twice; or charging may be performed from the second electrode twice and detection may be performed from the second electrode twice. When the charging is performed from one electrode twice, the other electrode is grounded or connected with a large resistor to change the status of the other electrode. For example, when the level signals are applied to the first electrode twice to charge the self capacitor twice, during the first time charging, the second electrode is grounded, and during the second time charging, the second electrode is connected with a large resistor; and when the level signals are applied to the second electrode twice to charge the self capacitor twice, during the first time charging, the first electrode is grounded, and during the second time charging, the first electrode is connected with a large resistor.
Thus, even if the charging is performed twice from the first electrode, because of a change of a status of the second electrode, the detection may be performed twice from the first electrode to obtain the first detecting value and the second detecting value reflecting the ratio between the first resistor and the second resistor.
3. Level signals are applied to the first electrode and the second electrode of the induction unit to
charge the self capacitor; the first electrode and/or the second electrode are controlled to be grounded to discharge the self capacitor; and then a discharging detection is performed from the first electrode and/or the second electrode to obtain a first discharging detecting value and a second discharging detecting value. In the embodiment, since the charging of the self capacitor is performed from the first electrode and the second electrode, the discharging or detection may be performed from the first electrode and/or the second electrode. Specifically, level signals may be applied to the first electrode and the second electrode simultaneously or separately to charge the self capacitor. During the twice discharging, the first electrode may be grounded twice respectively, or the second electrode may be grounded twice respectively.
4. A level signal is applied to the first electrode or the second electrode of the induction unit to charge the self capacitor; the first electrode and the second electrode are controlled to be grounded to discharge the self capacitor; and then a discharging detection is performed from the first electrode and/or the second electrode to obtain a first discharging detecting value and a second discharging detecting value. In the embodiment, since the discharging of the self capacitor is performed from the first electrode and the second electrode, the charging or detection may be performed from the first electrode and/or the second electrode. In this embodiment, the charging may be performed from the first electrode twice, and the second electrode may be grounded or connected with a large resistor; also, the charging may be performed from the second electrode twice, and the first electrode may be grounded or connected with a large resistor.
5. A level signal is applied to the first electrode or the second electrode of the induction unit to charge the self capacitor; the first electrode or the second electrode is controlled to be grounded to discharge the self capacitor; and then a discharging detection is performed from the first electrode and the second electrode to obtain a first discharging detecting value and a second discharging detecting value. In this embodiment, since the detection of the self capacitor is performed from the first electrode and the second electrode, the charging or discharging may be performed from the first electrode and/or the second electrode. In the embodiment, the charging may be performed from the first electrode twice, and the second electrode may be grounded or connected with a large resistor; also, the charging may be performed from the second electrode twice, and the first electrode may be grounded or connected with a large resistor.
Alternatively, based on the above embodiments, a first detection may be performed when charging the self capacitor to obtain the first charging detecting value, a second detection may be
performed when discharging the self capacitor to obtain the second discharging detecting value, and then a ratio between the first resistor and the second resistor may be obtained according to the first charging detecting value and the second discharging detecting value.
It should be noted that in some embodiments, a function of the first electrode and the second electrode are the same, and the first electrode and the second electrode are interchangeable. Therefore, in the above embodiments, the detection may be performed from the first electrode or from the second electrode, as long as there is a current flowing through the first resistor and the second resistor during the charging, discharging and detection.
The above embodiments show that there may be many variations with respect to the charging and detection. According to an embodiment of the present disclosure, the touch position is determined according to a relation (for example, ratio) between the first resistor and the second resistor. Further, the relation between the first resistor and the second resistor is detected by charging and/or discharging the self capacitor. If the induction unit is not touched, no self capacitor will be generated, and it will be determined that there is no touch. Therefore, in some embodiments, a scanning will be repeated until the finger touches the induction unit, which will not be illustrated in detail here.
In some embodiments, corresponding voltages may be applied to the plurality of induction units sequentially, and the detection may be performed for the plurality of induction units sequentially.
It should be noted that the above detecting methods are only some preferable methods according to the embodiments of the present disclosure, and those skilled in the art may expand, amend or modify the embodiments without departing from the spirits of the present disclosure.
Fig. 4a is a schematic view of a touch detecting assembly according to an embodiment of the present disclosure. The touch detecting assembly 300 comprises a substrate 100, and a plurality of induction units 200 disposed on the substrate 100 and not intersecting with each other. Each induction unit 200 comprises a first electrode 210 and a second electrode 220. In some embodiments, the substrate 100 is a monolayer substrate. Each induction unit 200 may be U-shaped, lengths of the plurality of induction units 200 are different from each other, and the plurality of induction units 200 are partly embedded one by one. Each induction unit 200 comprises a first part 230, and a second part 240 and a third part 250 not intersecting with each other. One end of the second part 240 is connected with one end of the first part 230, one end of the third part 250 is connected with the other end of the first part 230, the other end of the second part 240 comprises a first electrode 210, and the other end of the third part 250 comprises a second electrode 220. Preferably, each first part 230 is parallel to a first
side 110 of the substrate 100, and each second part 240 and each third part 250 are parallel to a second side 120 of the substrate 100 respectively. The first electrodes 210 and the second electrodes 220 of the plurality of induction units 200 are connected with corresponding pins of a control chip 400.
In some embodiments, the phrase "embedded partly one by one" means that an outer induction unit partly surrounds an inner induction unit, for example, as shown in Fig. 4a, so as to achieve a comparatively large contact area while guaranteeing a detecting precision, reducing a computing complexity and improving a responding speed of the touch detecting assembly. Certainly, those skilled in the art may adopt other embedding methods to arrange the induction units according to the principle shown in Fig. 4a.
In one embodiment, the first parts 230 of the plurality of induction units 200 are parallel to each other, the second parts 240 of the plurality of induction units 200 are parallel to each other, and the third parts 250 of the plurality of induction units 200 are parallel to each other. In one embodiment, at least one of the first part 230, the second part 240 and the third part 250 of each induction unit 200 has a rectangular shape. Preferably, all of the first part 230, the second part 240 and the third part 250 of each induction unit 200 have a rectangular shape. In this embodiment, because of the rectangular shape, when the finger moves horizontally or vertically, the linearity may be good. In addition, a distance between every two adjacent rectangular induction units 200 may be the same so as to improve the calculation speed.
Detections are performed at two ends of each induction unit in the touch detecting assembly according to an embodiment of the present disclosure. The two ends of the induction unit have electrodes respectively and each electrode is connected with a corresponding pin of the control chip. When the touch detection is performed, the touch position may be determined on the induction unit. In addition, with the substantial U-shaped induction unit in the touch detecting assembly according to an embodiment of the present disclosure, a structure complexity of a device may be reduced and the device is easy to manufacture. All the electrodes are located at the same side, which are easy to manufacture, thus reducing a manufacturing cost.
More importantly, the touch position is determined according to the ratio between the first resistor and the second resistor. Compared with the conventional diamond or triangular designs, the self capacitor doesn't need to be calculated when determining the touch position, and the magnitude of the self capacitor will not influence a precision of the touch position, and thus the self capacitor detection doesn't need to be as precise as before and the detecting precision and the linearity may be
improved. In addition, since any one of the first part, the second part and the third part of each induction unit may have a regular rectangular shape, compared with the conventional diamond or triangular designs, the linearity may be further improved.
In one embodiment, lengths of the second part 240 and of the third part 250 of each induction unit 200 are identical.
In one embodiment, the substrate 100 has a rectangular shape, the first side 110 and the second side 120 of the substrate 100 are vertical to each other, the second part 240 and the first part 230 of each induction unit 200 are vertical to each other, and the third part 250 and the first part 230 of each induction unit 200 are vertical to each other.
In one embodiment, distances between the first parts 230 of every two adjacent induction units
200 are identical, distances between the second parts 240 of every two adjacent induction units 200 are identical, and distances between the third parts 250 of every two adjacent induction units 200 are identical. Therefore, the plurality of induction units 200 may be used to uniformly divide the first side 110 and the second side 120 of the substrate 100 to improve a computing speed. Of course, in other embodiments, distances between the first parts 230 of every two adjacent induction units 200 may be different, or distances between the second parts 240 of every two adjacent induction units 200 may be different, as shown in Fig. 4b. For example, since a user usually touches a central part of the touch detecting assembly, a distance between the induction units 200 at the central part of the touch detecting assembly may be reduced to improve a detecting precision at the central part of the touch detecting assembly.
In one embodiment, the plurality of induction units 200 are located in a same layer. Therefore, only one ITO layer is required, thus reducing a manufacturing cost largely while ensuring a precision.
In one embodiment, each induction unit 200 is symmetrical with respect to a central axis Y of the substrate 100, as shown in Fig. 4a, and the central axis Y of the substrate 100 is vertical to the first part 230 of each induction unit 200, thus improving a precision.
As shown in Fig. 4a, in this embodiment, both the first electrode 210 and the second electrode 220 of each induction unit 200 are located at the first side 110 of the substrate 100. In this embodiment, after a touch position on an induction unit is detected, a touch position on a touch screen may be obtained.
It should be noted that the substantially U-shaped induction units 200 shown in Fig. 4a are only examples of the induction unit, which may achieve a larger contact area. However, there may be
variations to the embodiments shown in Fig. 4a. For example, the second part 240 and the third part 250 of each induction unit 200 may not be parallel to each other.
Fig. 5 is a schematic view showing that an induction unit of a touch detecting assembly is touched according to an embodiment of the present disclosure. As shown in Fig. 5, the touch position A is near the second electrode 220. Assume the length of the induction unit 200 has a length of ten units and the induction unit 200 is uniformly divided into 10 parts. The first part 230 has a length of four units, and each of the second part 240 and the third part 250 has a length of three units. After detection, it is known that a ratio between the first resistor and the second resistor is 4: 1, i.e., a distance from the first electrode 210 to the touch position (reflected by the first resistor) accounts for 80% of the whole length of the induction unit 200. In other words, the touch point is at a position whose distance to the first electrode 210 is 8 units, or the touch point is at a position whose distance to the second electrode 220 is 2 units.
From the examples shown in Fig. 5, it is clear that a computing method of the touch detecting assembly according to an embodiment of the present disclosure is simple, which may improve a responding speed of the detection of the touch detecting assembly.
Fig. 6 is a schematic view of a touch sensitive device according to an embodiment of the present disclosure. The touch sensitive device comprises the touch detecting assembly 300 constituted by the substrate 100 and the plurality of induction units 200 disposed on the substrate 100 and not intersecting with each other, and a control chip 400. The first electrodes 210 and the second electrodes 220 of the plurality of induction units 200 are connected with corresponding pins of a control chip 400. The control chip 400 is configured to apply a level signal to each first electrode 210 and/or each second electrode 220 to charge a self capacitor generated by a touch on an induction unit 200, to calculate a ratio between a first resistor between a first electrode 210 of at least one induction unit 200 and the self capacitor and a second resistor between a second electrode 220 of the at least one induction unit 200 and the self capacitor when the at least one induction unit 200 is detected by the control chip 400 to be touched, and to calculate a coordinate of a touch point according to the at least one induction unit 200 touched and the ratio between the first resistor and the second resistor. Similarly, the charging and the detection may be performed simultaneously or separately, and the discharging and the detection may be performed simultaneously or separately, which will not be illustrated in detail here. For example, referring to Fig. 5, when the outmost induction unit 200 is touched and a ratio between the first resistor and the second resistor of the outmost induction unit 200
is obtained by the control chip 400, because the position information of the outmost induction unit 200 has been stored in the control chip 400 or an external memory, the control chip 400 may search for the position information of the outmost induction unit 200 according to the ratio between the first resistor and the second resistor of the outmost induction unit 200 so as to determine the coordinate of the touch point.
In some embodiments, a finger or other objects will touch a plurality of induction units 200. At this time, the control chip 400 may first obtain a touch position on each of the plurality of induction units 200 touched, and then a final touch position on the touch screen may be calculated by averaging.
In addition, each of the first detecting value and the second detecting value may be any one of a current detecting value, a self capacitance detecting value, a level signal detecting value, a charge variation and a combination thereof, provided that the detecting values reflect a difference between the first resistor and the second resistor.
In one embodiment, the control chip 400 comprises two capacitance detecting modules so as to detect the induction unit 200 from the first electrode 210 and the second electrode 220 simultaneously. Because the two capacitance detecting modules may share some means, the overall power consumption of the control chip may not be increased.
In another embodiment, only one capacitance detecting module may be used to detect the induction unit 200 from the first electrode 210 and from the second electrode 220 sequentially. The control chip 400 may determine the touch position according to the ratio between the first resistor and the second resistor.
In one embodiment, the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when charging/discharging the self capacitor.
In one embodiment, each of the first detecting value and the second detecting value is any one of a current detecting value, a self capacitance detecting value, a level signal detecting value, a charge variation and a combination thereof.
In one embodiment, the first detecting value comprises a first charging detecting value and a first discharging detecting value, and the second detecting value comprises a second charging detecting value and a second discharging detecting value.
In one embodiment, the control chip 400 is configured to apply level signals to the first electrode
210 and the second electrode 220 of the at least one induction unit 200 touched to charge the self
capacitor, and to perform a charging detection from the first electrode 210 and/or the second electrode 220 of the at least one induction unit 200 touched to obtain the first charging detecting value and the second charging detecting value.
In one embodiment, the control chip 400 is configured to apply a level signal twice to the first electrode 210 or the second electrode 220 of the at least one induction unit 200 touched to charge the self capacitor twice, and to perform a charging detection from the first electrode 210 and/or the second electrode 220 of the at least one induction unit 200 touched to obtain the first charging detecting value and the second charging detecting value after each charging.
In one embodiment, when the control chip 400 applies the level signal twice to the first electrode 210 of the at least one induction unit 200 touched to charge the self capacitor twice, the second electrode 220 of the at least one induction unit 200 touched is grounded for a first time charging, and the second electrode 220 of the at least one induction unit 200 touched is connected with a large resistor for a second time charging; or when the control chip 400 applies the level signal twice to the second electrode 220 of the at least one induction unit 200 touched to charge the self capacitor twice, the first electrode 210 of the at least one induction unit 200 touched is grounded for a first time charging, and the first electrode 210 of the at least one induction unit 200 touched is connected with a large resistor for a second time charging.
In one embodiment, the control chip 400 is configured to apply level signals to the first electrode 210 and the second electrode 220 of the at least one induction unit 200 touched to charge the self capacitor, to control the first electrode 210 and/or the second electrode 220 of the at least one induction unit 200 touched to be grounded to discharge the self capacitor, and to perform a discharging detection from the first electrode 210 and/or the second electrode 220 of the at least one induction unit 200 touched to obtain the first discharging detecting value and the second discharging detecting value.
In one embodiment, the control chip 400 is configured to apply a level signal to the first electrode 210 or the second electrode 220 of the at least one induction unit 200 touched to charge the self capacitor, to control the first electrode 210 and the second electrode 220 of the at least one induction unit 200 touched to be grounded respectively to discharge the self capacitor, and to perform a discharging detection from the first electrode 210 and/or the second electrode 220 of the at least one induction unit 200 touched to obtain the first discharging detecting value and the second discharging detecting value.
In one embodiment, the control chip 400 is configured to apply a level signal to the first electrode
210 or the second electrode 220 of the at least one induction unit 200 touched to charge the self capacitor, to control the first electrode 210 or the second electrode 220 of the at least one induction unit 200 touched to be grounded to discharge the self capacitor, and to perform a discharging detection from the first electrode 210 and the second electrode 220 of the at least one induction unit 200 touched to obtain the first discharging detecting value and the second discharging detecting value.
In one embodiment, the control chip 400 comprises one or two capacitance detecting modules. According to an embodiment of the present discourse, level signals are applied to electrodes of the induction unit at both ends of the induction unit. A self capacitor may be formed when the induction unit is touched. Therefore, the self capacitor may be charged by the applied level signals and a touch position may be determined according to a ratio between the first resistor and the second resistor. For example, in one embodiment, the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when charging/discharging the self capacitor. Therefore, the first detecting value and the second detecting value may be detected from the first electrode and/or the second electrode when charging or discharging the self capacitor. Thus, the first detecting value and the second detecting value may reflect the touch position on the induction unit, and the touch position on the induction unit may be further determined.
The touch sensitive device according to an embodiment of the present disclosure adopts a novel self capacitor detecting method. When the induction unit is touched, a self capacitor is generated at the touch position on the touch sensitive device, and the touch position may divide the induction unit into two resistors. When the self capacitor detection is performed, the touch position on the induction unit may be determined by taking into account the two resistors. The touch sensitive device according to an embodiment of the present disclosure is simple in structure. Moreover, for one induction unit, the charging or discharging may be performed from the first electrode and/or the second electrode of the one induction unit, and the detection may be performed during the charging and/or discharging, which may not only reduce a C constant, save time and improve an efficiency, but also ensure that a coordinate may not drift. In addition, with the touch sensitive device according to an embodiment of the present disclosure, a signal-to-noise ratio of a circuit may be effectively enhanced, a noise of the circuit may be reduced, and a linearity of an induction may be improved. Furthermore, because the induction unit touched is charged during the detection, small current may be generated in the induction unit touched, and an influence of a level signal Vcom on the self capacitor generated by a touch on
an induction unit on the touch screen may be eliminated. Accordingly, a screen shielding layer and related procedures may be eliminated, thus further reduce a cost while enhancing an anti-interference capability.
A portable electronic device according to an embodiment of the present discourse may comprise the touch detection assembly 300 according to the above-mentioned embodiments of the present discourse. A portable electronic device according to an embodiment of the present discourse may comprise the touch sensitive device according to the above-mentioned embodiments of the present discourse. Other constructions such as a structure, a control and an operation of the portable electronic device according to an embodiment of the present discourse are obvious to those skilled in the art and will not be described in detail here.
Reference throughout this specification to "an embodiment," "some embodiments," "one embodiment", "another example," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as "in some embodiments," "in one embodiment", "in an embodiment", "in another example," "in an example," "in a specific example," or "in some examples," in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments can not be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.
Claims
1. A touch sensitive device, comprising:
a touch detecting assembly comprising:
a substrate; and
a plurality of induction units disposed on the substrate and not intersecting with each other, each induction unit comprising:
a first part; and
a second part and a third part not intersecting with each other, wherein one end of the second part is connected with one end of the first part, one end of the third part is connected with the other end of the first part, the other end of the second part comprises a first electrode, and the other end of the third part comprises a second electrode; and a control chip, wherein the first electrodes and the second electrodes of the plurality of induction units are connected with corresponding pins of the control chip; and the control chip is configured to apply a level signal to each first electrode and/or each second electrode to charge a self capacitor generated by a touch on at least one induction unit, to calculate a ratio between a first resistor between a first electrode of the at least one induction unit and the self capacitor and a second resistor between a second electrode of the at least one induction unit and the self capacitor when the at least one induction unit is detected by the control chip to be touched, and to calculate a coordinate of a touch point according to the at least one induction unit touched and the ratio between the first resistor and the second resistor.
2. The touch sensitive device according to claim 1, wherein lengths of the plurality of induction units are different from each other, and the plurality of induction units are partly embedded one by one.
3. The touch sensitive device according to claim 1, wherein the first parts of the plurality of induction units are parallel to each other, the second parts of the plurality of induction units are parallel to each other, and the third parts of the plurality of induction units are parallel to each other.
4. The touch sensitive device according to claim 3, wherein each first part is parallel to a first side of the substrate, and each second part and each third part are parallel to a second side of the substrate respectively.
5. The touch sensitive device according to claim 4, wherein lengths of the second part and the third part of the induction unit are identical.
6. The touch sensitive device according to claim 4, wherein the substrate has a rectangular shape, the first side and the second side of the substrate are vertical to each other, the second part and the first part of the induction unit are vertical to each other, and the third part and the first part of the induction unit are vertical to each other.
7. The touch sensitive device according to claim 4, wherein distances between the first parts of every two adjacent induction units are identical, distances between the second parts of every two adjacent induction units are identical, and distances between the third parts of every two adjacent induction units are identical.
8. The touch sensitive device according to claim 4, wherein the plurality of induction units are located in a same layer.
9. The touch sensitive device according to claim 4, wherein each induction unit is symmetrical with respect to a central axis of the substrate, and the central axis of the substrate is vertical to the first part of each induction unit.
10. The touch sensitive device according to claim 1, wherein at least one of the first part, the second part and the third part has a rectangular shape.
11. The touch sensitive device according to claim 1, wherein the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when charging/discharging the self capacitor.
12. The touch sensitive device according to claim 11, wherein each of the first detecting value and the second detecting value is any one of a current detecting value, a self capacitance detecting value, a level signal detecting value, a charge variation and a combination thereof.
13. The touch sensitive device according to claim 11, wherein the first detecting value comprises a first charging detecting value and a first discharging detecting value, and the second detecting value comprises a second charging detecting value and a second discharging detecting value.
14. The touch sensitive device according to claim 13, wherein the control chip is configured to apply level signals to the first electrode and the second electrode of the at least one induction unit touched to charge the self capacitor, and to perform a charging detection from the first electrode and/or the second electrode of the at least one induction unit touched to obtain the first charging detecting value and the second charging detecting value.
15. The touch sensitive device according to claim 13, wherein the control chip is configured to apply a level signal twice to the first electrode or the second electrode of the at least one induction unit touched to charge the self capacitor twice, and to perform a charging detection from the first electrode and/or the second electrode of the at least one induction unit touched to obtain the first charging detecting value and the second charging detecting value after each charging.
16. The touch sensitive device according to claim 15, wherein
when the control chip applies the level signal twice to the first electrode of the at least one induction unit touched to charge the self capacitor twice, the second electrode of the at least one induction unit touched is grounded for a first charging, and the second electrode of the at least one induction unit touched is connected with a large resistor for a second charging; or
when the control chip applies the level signal twice to the second electrode of the at least one induction unit touched to charge the self capacitor twice, the first electrode of the at least one induction unit touched is grounded for a first charging, and the first electrode of the at least one induction unit touched is connected with a large resistor for a second charging.
17. The touch sensitive device according to claim 13, wherein the control chip is configured to apply level signals to the first electrode and the second electrode of the at least one induction unit touched to charge the self capacitor, to control the first electrode and/or the second electrode of the at least one induction unit touched to be grounded to discharge the self capacitor, and to perform a discharging detection from the first electrode and/or the second electrode of the at least one induction unit touched to obtain the first discharging detecting value and the second discharging detecting value.
18. The touch sensitive device according to claim 13, wherein the control chip is configured to apply a level signal to the first electrode or the second electrode of the at least one induction unit touched to charge the self capacitor, to control the first electrode and the second electrode of the at least one induction unit touched to be grounded respectively to discharge the self capacitor, and to perform a discharging detection from the first electrode and/or the second electrode of the at least one induction unit touched to obtain the first discharging detecting value and the second discharging detecting value.
19. The touch sensitive device according to claim 13, wherein the control chip is configured to apply a level signal to the first electrode or the second electrode of the at least one induction unit touched to charge the self capacitor, to control the first electrode or the second electrode of the at least one induction unit touched to be grounded to discharge the self capacitor, and to perform a discharging detection from the first electrode and the second electrode of the at least one induction unit touched to obtain the first discharging detecting value and the second discharging detecting value.
20. The touch sensitive device according to claim 11, wherein the control chip comprises one or two capacitance detecting modules.
21. A touch detecting assembly, comprising:
a substrate; and
a plurality of induction units disposed on the substrate and not intersecting with each other, each induction unit comprising:
a first part; and
a second part and a third part not intersecting with each other, wherein one end of the second part is connected with one end of the first part, one end of the third part is connected with the other end of the first part, the other end of the second part comprises a first electrode, and the other end of the third part comprises a second electrode.
22. The touch detecting assembly according to claim 21, wherein lengths of the plurality of induction units are different from each other, and the plurality of induction units are partly embedded one by one.
23. The touch detecting assembly according to claim 21, wherein the first parts of the plurality of induction units are parallel to each other, the second parts of the plurality of induction units are parallel to each other, and the third parts of the plurality of induction units are parallel to each other.
24. The touch detecting assembly according to claim 23, wherein each first part of induction units is parallel to a first side of the substrate, and each second part of induction units and each third part of induction units are parallel to a second side of the substrate respectively.
25. The touch detecting assembly according to claim 24, wherein lengths of the second part and the third part of the induction unit are identical.
26. The touch detecting assembly according to claim 24, wherein the substrate has a rectangular shape, the first side and the second side of the substrate are vertical to each other, the second part and the first part of each induction unit are vertical to each other, and the third part and the first part of each induction unit are vertical to each other.
27. The touch detecting assembly according to claim 24, wherein distances between the first parts of every two adjacent induction units are identical, distances between the second parts of every two adjacent induction units are identical, and distances between the third parts of every two adjacent induction units are identical.
28. The touch detecting assembly according to claim 24, wherein the plurality of induction units are located in a same layer.
29. The touch detecting assembly according to claim 24, wherein each induction unit is symmetrical with respect to a central axis of the substrate, and the central axis of the substrate is vertical to the first part of each induction unit.
30. The touch detecting assembly according to claim 21, wherein at least one of the first part, the second part and the third part has a rectangular shape.
31. A portable electronic apparatus, comprising a touch sensitive device according to any of claims 1-20.
32. A portable electronic apparatus, comprising a touch detecting assembly according to any of claims 21-30.
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| PCT/CN2012/079224 WO2013013637A1 (en) | 2011-07-26 | 2012-07-26 | Touch detecting method, touch sensitive device and portable electronic apparatus |
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