CN106325625B - Mutual capacitance touch screen capable of automatically adjusting width of sensing window - Google Patents
Mutual capacitance touch screen capable of automatically adjusting width of sensing window Download PDFInfo
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Abstract
The invention relates to a mutual capacitance touch screen capable of automatically adjusting width of an induction window, which comprises a plurality of TX scanning lines, a plurality of RX induction lines, a plurality of first switches, a plurality of second switches, a plurality of first bias circuits, a plurality of second bias circuits, a plurality of comparators, a plurality of compensation circuits, a plurality of window calculation processing modules, a plurality of current gain modules, a plurality of third switches, a plurality of integrating capacitors, a plurality of ADC sampling modules and a control module, wherein the control module controls operation of the plurality of first switches, the plurality of second switches, the plurality of third switches, the plurality of first bias circuits, the plurality of second bias circuits, the plurality of compensation circuits, the plurality of window calculation processing modules, the plurality of current gain modules and the plurality of ADC sampling modules. The mutual capacitance touch screen with the structure capable of automatically adjusting the width of the sensing window realizes the automatic detection function of the integrating window, can omit the process of manually debugging the integrating window, improves the development efficiency of products, and is accurate and reliable.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a touch screen technology, and specifically relates to a mutual capacitance touch screen capable of automatically adjusting the width of an induction window.
Background
According to the mutual capacitance detection technology commonly used for the touch screen, an RX input end receives a TX scanning signal after mutual capacitance induction, the high-low level change of the TX scanning signal can generate induction current Ix after mutual capacitance coupling induction, the Ix current stores induction charges on an integrating capacitor after gain control and window control, then an ADC samples voltage on the integrating capacitor, and an MCU judges whether touch occurs or not through the change of an ADC sampling value. Window control is achieved in the prior art by manual adjustment, and the general implementation manner is as follows: in the model machine debugging stage, a developer adjusts an integral window configuration register through software, so that the touch effect of the touch screen is best when a certain register is configured; the touch panel of the same model as the model is set according to the configuration value, and due to the manufacturing process factors, even though the touch panel of the same model is manufactured, the scanning lines and the sensing lines of each panel may have some differences of resistance-capacitance parameters, and the existence of the differences makes the use of uniform integral window configuration of the panel of the same model less ideal.
Fig. 1 is a schematic diagram of a mutual capacitance detection technique in the prior art. The TX scanning line emits a detection waveform, the RX sensing line generates an Irx sensing current through mutual capacitive coupling, the Irx sensing current is controlled by gain control and window control, charges are stored on an internal integration capacitor Vcap, and then the voltage is integrated through an ADC sampling Vcap. When a finger touches the mutual capacitance screen, the human body is equivalent to a conductor connected to the ground, and the current on the RX induction line can be split by the human body, so that the obtained integral voltage can be changed. The MCU judges whether touch occurs or not by detecting the change of the ADC sampling value. The window control mentioned in the application is realized by configuring a window register through an MCU in the prior art, and the window parameter is reasonably obtained only by continuous manual debugging, so that the operation is complex. In addition, the control of the current integration window needs to be manually debugged to determine, once the parameters of the touch screen change, the touch screen needs to be debugged again, and therefore time and labor are wasted, FAE technicians are needed to participate in parameter debugging when the touch screen is applied to different touch screens, and the touch screen is unfavorable in popularization of the touch screen.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the mutual capacitance touch screen capable of eliminating the process of debugging an integral window by a scheme personnel in a debugging stage and eliminating the defects caused by uniform configuration and automatically adjusting the width of the induction window.
In order to achieve the above object, the mutual capacitance touch screen of the present invention for automatically adjusting the width of the sensing window has the following constitution:
the mutual capacitance touch screen capable of automatically adjusting width of an induction window comprises a plurality of TX scanning lines and a plurality of RX induction lines, and is mainly characterized in that an induction window width adjusting circuit is arranged at a leading-out end of each RX induction line, and comprises: the first end of the first switch is connected with the output end of the RX induction line; the first end of the second switch is connected with the output end of the RX induction line; the output end of the first bias circuit is connected with the second end of the first switch; the first input end of the comparator is connected with the output end of the first bias circuit; the output end of the second bias circuit is connected with the second input end of the comparator; the second bias circuit and the first bias circuit are corresponding mirror image bias circuits; the compensation circuit is connected with the output end of the second bias circuit; the input end of the window calculation processing module is connected with the output end of the comparator; the input end of the current gain module is connected with the second end of the second switch; the first end of the third switch is connected with the first end of the current gain module, and the control end of the third switch is connected with the output end of the window calculation processing module; the first end of the integrating capacitor is connected with the second end of the third switch; the second end of the integrating capacitor is grounded; the ADC sampling module is connected with the integrating capacitor to sample the integrating capacitor;
the touch screen further comprises:
the control module is used for controlling each sensing window width adjusting circuit in the touch screen.
Further, an induction window width adjusting circuit is arranged at the leading-out end of each TX scanning line.
Further, the compensation circuit includes a fourth switch, a fifth switch, a first excitation source and a second excitation source, where a first end of the fourth switch is connected to the output end of the second bias circuit, a second end of the fourth switch is connected to the first end of the first excitation source, a second end of the first excitation source is connected to an external power supply, a second end of the fifth switch is connected to the output end of the second bias circuit, a first end of the fifth switch is connected to the second end of the second excitation source, and a first end of the second excitation source is grounded.
Still further, the fourth switch and the fifth switch are both high frequency switches.
Further, the first bias circuit and the second bias circuit each comprise a first resistor, a second resistor and a third excitation source; the first end of the first resistor is connected with the second end of the second resistor, the first end of the second resistor is grounded, the second end of the first resistor is connected with the first end of the third excitation source, the second end of the third excitation source is connected with an external power supply, and the first end of the first resistor is the output end of the first bias circuit or the second bias circuit;
or the first end of the first resistor is connected with the second end of the second resistor, the first end of the second resistor is connected with the first end of the third excitation source, the second end of the third excitation source is grounded, the second end of the first resistor is connected with an external power supply, and the first end of the first resistor is the output end of the first bias circuit or the second bias circuit.
Further, the window calculation processing module comprises a counter and logic control unit, a positive pulse width parameter register and a negative pulse width parameter register; the positive pulse width parameter register, the negative pulse width parameter register and the comparator are respectively connected with the counter and the logic control unit, the output end of the positive pulse width parameter register and the output end of the negative pulse width parameter register are connected with the control end of the third switch, and the control module is connected with the counter and the logic control unit.
Further, the first switch, the second switch and the third switch are all high-frequency switches.
The mutual capacitance touch screen capable of automatically adjusting the width of the sensing window can realize the automatic detection function of the integral window, can omit the process of manually debugging the integral window, and improves the development efficiency of products; after the integration window realizes automatic detection, the control precision of the window is more accurate than that of a window obtained by manual debugging, and an accurate integration window is more beneficial to eliminating interference, is simple to operate and has a wide application range.
Drawings
Fig. 1 is a schematic diagram of a mutual capacitance detection technique in the prior art.
FIG. 2 is a schematic diagram of a mutual capacitance touch screen with an automatic sensing window width adjustment according to the present invention.
Fig. 3 is a waveform diagram of the induced positive current and the comparator output level of the present invention.
Fig. 4 is a waveform diagram of the induced negative current and the comparator output level of the present invention.
Fig. 5 is a schematic diagram of a compensation circuit according to the present invention.
Fig. 6 is a schematic diagram of a first embodiment of the bias circuit of the present invention.
Fig. 7 is a schematic diagram of a second embodiment of the bias circuit of the present invention.
Fig. 8 is a schematic structural diagram of a window computing processing module according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
Referring to fig. 2, the present invention utilizes a combination of a first bias circuit, a second bias circuit, a compensation circuit, a comparator CMP, a window calculation processing module, a first switch K1 and a second switch K2 to implement a positive (negative) induced current integration window automatic detection technique when mutual capacitance detection is performed.
Referring to fig. 2, a schematic diagram of a mutual capacitive touch screen capable of automatically adjusting the width of a sensing window according to the present invention is shown. This mutual capacitance touch screen of automatically regulated response window width, including several TX scanning line, several RX induction line, wherein on prior art's basis, all be provided with response window width adjustment circuit at the leading-out of every RX induction line, response window width adjustment circuit include: the first end of the first switch K1 is connected with the output end of the RX induction line; the first end of the second switch K2 is connected with the output end of the RX induction line; the output end of the first bias circuit is connected with the second end of the first switch K1; the first input end of the comparator CMP is connected with the output end of the first bias circuit; the output end of the second bias circuit is connected with the second input end of the comparator CMP; the second bias circuit and the first bias circuit are corresponding mirror image bias circuits; the compensation circuit is connected with the output end of the second bias circuit; the input end of the window calculation processing module is connected with the output end of the comparator CMP; the input end of the current gain module is connected with the second end of the second switch K2; the first end of the third switch K3 is connected with the first end of the current gain module, and the control end of the third switch K3 is connected with the output end of the window calculation processing module; an integrating capacitor Vcap, wherein a first end of the integrating capacitor Vcap is connected with a second end of the third switch K3; the second end of the integrating capacitor Vcap is grounded; the ADC sampling module is connected with the integrating capacitor Vcap to sample the integrating capacitor Vcap;
the touch screen further comprises:
and the control module MCU is used for controlling each sensing window width adjusting circuit in the touch screen.
In a preferred embodiment, a sensing window width adjustment circuit is also provided at the exit of each TX scan line. In the specific embodiment of the present disclosure, only the induction window width adjusting circuit is provided at the leading-out end of the RX induction line, but a person skilled in the art can obtain a related technical solution when the induction window width adjusting circuit is provided at the leading-out end of each TX scanning line, which is not described herein.
Based on the circuit connection relation, the first switch K1 in the mutual capacitance touch screen capable of automatically adjusting the width of the induction window is closed during automatic window opening detection, is opened during normal operation, the second switch K2 is opened during automatic window opening detection, is closed during normal operation, and controls the operation of the first switch K1 and the second switch K2 through the control module MCU, so that the effect of controlling the flow direction of induction current of an RX induction line can be achieved. The second bias circuit is used for providing a reference level, is connected with the second input end of the comparator CMP, and the first bias circuit and the second bias circuit are mirror image bias circuits, wherein the mirror images mean that the same parameters are the same in structure, the first bias circuit is connected with the first input end of the comparator CMP, and in addition, the first bias circuit is connected with the RX induction line through a first switch K1 and is used for receiving RX induction current in a detection mode.
When the circuit starts to enter the automatic window detection mode, the compensation circuit provides a small compensation current, so that the input voltage of the comparator connected with the second bias circuit is higher (or lower) than the input voltage of the comparator CMP connected with the first bias circuit; then, the TX scanning line starts to transmit the TX scanning waveform, and when the RX sensing line senses the change of the scanning waveform of the TX scanning line through the mutual capacitance, an induced current is generated, and the induced current is added into the first bias circuit, so that the voltage of the input end of the comparator CMP connected with the first bias circuit is increased (or decreased), and the output level of the comparator CMP is inverted. When the TX scanning waveform tends to be in a stable high level (or low level), the RX induced current gradually disappears, so that the voltage of the input end of the comparator connected with the first bias circuit is reduced (or increased), and the output level of the comparator is turned over; referring to fig. 3 and fig. 4, fig. 3 is a waveform diagram of the induced positive current and the output level of the comparator according to the present invention, and fig. 4 is a waveform diagram of the induced negative current and the output level of the comparator according to the present invention.
In addition, in a preferred embodiment, the compensation circuit also varies according to the magnitude of the compensation current provided by the touch screen, and the compensation current may be set by the control module MCU, for example, in a preferred embodiment, the compensation current may be set to 1 microampere or 10 microampere, which will not be described herein.
The compensation circuit of the invention mainly comprises two forms: a positive current compensation circuit is mainly used for carrying out positive current compensation on reference voltage during positive current detection; the other is a negative current compensation circuit, which is mainly used for carrying out negative current compensation on the reference voltage during negative induction current detection. In a preferred embodiment, referring to fig. 5, the compensation circuit includes a fourth switch K4, a fifth switch K5, a first excitation source Ip and a second excitation source In, where a first end of the fourth switch K4 is connected to the output end of the compensation circuit, a second end of the fourth switch K4 is connected to the first end of the first excitation source Ip, a second end of the first excitation source Ip is connected to an external power source, a second end of the fifth switch K5 is connected to the output end of the compensation circuit, and a first end of the fifth switch K5 is connected to the second end of the second excitation source In, and a first end of the second excitation source In is grounded.
In order to better control the touch screen to switch between two modes, in a preferred embodiment, the fourth switch K4 and the fifth switch K5 are both high frequency switches.
In a preferred embodiment, please refer to fig. 6, which is a schematic diagram illustrating a first embodiment of the bias circuit of the present invention. The first bias circuit and the second bias circuit comprise a first resistor R1, a second resistor R2 and a third excitation source I; the first end of the first resistor R1 is connected with the second end of the second resistor R2, the first end of the second resistor R2 is grounded, the second end of the first resistor R1 is connected with the first end of the third excitation source I, the second end of the third excitation source I is connected with an external power supply, and the first end of the first resistor R1 is the output end of the first bias circuit or the second bias circuit;
in another preferred embodiment, please refer to fig. 7, which is a schematic diagram illustrating a second embodiment of the bias circuit of the present invention. The first end of the first resistor R1 is connected with the second end of the second resistor R2, the first end of the second resistor R2 is connected with the first end of the third excitation source I, the second end of the third excitation source I is grounded, the second end of the first resistor R1 is connected with an external power supply, and the first end of the first resistor R1 is the output end of the first bias circuit or the second bias circuit.
The window calculation processing module calculates the pulse width of the induced current output by the comparator to obtain window parameters of positive (negative) integral current; mainly comprises the following steps: (1) A counter for calculating the width of the positive (negative) induced current pulse width; (2) And the positive (negative) pulse width parameter register is used for storing and calculating positive (negative) induction current integration window parameters. The window calculation processing module is mainly used for: (1) Receiving positive (negative) induction current pulse width output by the comparator, and calculating the positive (negative) induction current pulse width according to the instruction and the counting clock sent by the control module MCU, thereby obtaining positive (negative) induction current window parameters; (2) The positive (negative) induced current integration window time is controlled by the positive (negative) induced current window parameter. In a preferred embodiment, referring to fig. 8, the window calculating and processing module includes a counter and logic control unit, a positive pulse width parameter register, and a negative pulse width parameter register; the positive pulse width parameter register, the negative pulse width parameter register and the comparator CMP are respectively connected with the counter and the logic control unit, the output end of the positive pulse width parameter register and the output end of the negative pulse width parameter register are connected with the control end of the third switch K3, and the control module MCU is connected with the counter and the logic control unit.
In order to better control the width of the sensing window and the pulse width of the sensing current in the touch screen, in a preferred embodiment, the first switch K1, the second switch K2 and the third switch K3 are all high-frequency switches.
In addition, there may be one or more sets of positive (negative) integration window parameters for each RX sense line in the present invention, and each TX scan line may have a corresponding set of positive (negative) integration window parameters, depending on the number of TX scan lines.
The mutual capacitance touch screen capable of automatically adjusting the width of the sensing window can realize the automatic detection function of the integral window, can omit the process of manually debugging the integral window, and improves the development efficiency of products; after the integration window realizes automatic detection, the control precision of the window is more accurate than that of a window obtained by manual debugging, and an accurate integration window is more beneficial to eliminating interference, is simple to operate and has a wide application range.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (7)
1. The utility model provides an automatic mutual capacitance touch-sensitive screen of regulation response window width, includes several TX scanning line, several RX induction line, its characterized in that all is provided with response window width adjustment circuit at the terminal of every RX induction line, response window width adjustment circuit include: the first end of the first switch is connected with the output end of the RX induction line; the first end of the second switch is connected with the output end of the RX induction line; the output end of the first bias circuit is connected with the second end of the first switch; the first input end of the comparator is connected with the output end of the first bias circuit; the output end of the second bias circuit is connected with the second input end of the comparator; the second bias circuit and the first bias circuit are corresponding mirror image bias circuits; the compensation circuit is connected with the output end of the second bias circuit; the input end of the window calculation processing module is connected with the output end of the comparator; the input end of the current gain module is connected with the second end of the second switch; the first end of the third switch is connected with the first end of the current gain module, and the control end of the third switch is connected with the output end of the window calculation processing module; the first end of the integrating capacitor is connected with the second end of the third switch; the second end of the integrating capacitor is grounded; the ADC sampling module is connected with the integrating capacitor to sample the integrating capacitor;
the touch screen further comprises:
the control module is used for controlling each sensing window width adjusting circuit in the touch screen.
2. The mutual capacitance touch screen of claim 1, wherein a sensing window width adjustment circuit is provided at the output of each TX scan line.
3. The self-adjusting touch screen of claim 2, wherein the compensation circuit comprises a fourth switch, a fifth switch, a first excitation source, and a second excitation source, the first end of the fourth switch is connected to the output of the second bias circuit, the second end of the fourth switch is connected to the first end of the first excitation source, the second end of the first excitation source is connected to an external power source, the second end of the fifth switch is connected to the output of the second bias circuit, and the first end of the fifth switch is connected to the second end of the second excitation source, which is grounded.
4. The mutual capacitance touch screen of claim 3, wherein the fourth switch and the fifth switch are high frequency switches.
5. The mutual capacitance touch screen capable of automatically adjusting the width of an induction window according to claim 2, wherein the first bias circuit and the second bias circuit comprise a first resistor, a second resistor and a third excitation source; the first end of the first resistor is connected with the second end of the second resistor, the first end of the second resistor is grounded, the second end of the first resistor is connected with the first end of the third excitation source, the second end of the third excitation source is connected with an external power supply, and the first end of the first resistor is the output end of the first bias circuit or the second bias circuit;
or the first end of the first resistor is connected with the second end of the second resistor, the first end of the second resistor is connected with the first end of the third excitation source, the second end of the third excitation source is grounded, the second end of the first resistor is connected with an external power supply, and the first end of the first resistor is the output end of the first bias circuit or the second bias circuit.
6. The mutual capacitance touch screen capable of automatically adjusting the width of a sensing window according to claim 2, wherein the window calculation processing module comprises a counter and logic control unit, a positive pulse width parameter register and a negative pulse width parameter register; the positive pulse width parameter register, the negative pulse width parameter register and the comparator are respectively connected with the counter and the logic control unit, the output end of the positive pulse width parameter register and the output end of the negative pulse width parameter register are connected with the control end of the third switch, and the control module is connected with the counter and the logic control unit.
7. The mutual capacitance touch screen of claim 2, wherein the first switch, the second switch and the third switch are all high frequency switches.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1627090A (en) * | 2003-12-10 | 2005-06-15 | 上海贝岭股份有限公司 | A circuit structure capable of automatic adjusting and measuring hysteresis window of hysteresis comparator |
| CN102782626A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Capacitive touch system using both self and mutual capacitance |
| CN103116424A (en) * | 2011-11-16 | 2013-05-22 | 飞思卡尔半导体公司 | Touch tablet capacitance-type sensor circuit |
| US8779783B1 (en) * | 2013-03-12 | 2014-07-15 | Cypress Semiconductor Corporation | Mutual capacitance sensing using a self-capacitance sensing device |
| CN204740578U (en) * | 2015-06-30 | 2015-11-04 | 无锡华润矽科微电子有限公司 | Automatic adjust mutual capacitive touch panel of response window width |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140046813A (en) * | 2012-10-11 | 2014-04-21 | 삼성전자주식회사 | Touch sensing device and driving method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1627090A (en) * | 2003-12-10 | 2005-06-15 | 上海贝岭股份有限公司 | A circuit structure capable of automatic adjusting and measuring hysteresis window of hysteresis comparator |
| CN102782626A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Capacitive touch system using both self and mutual capacitance |
| CN103116424A (en) * | 2011-11-16 | 2013-05-22 | 飞思卡尔半导体公司 | Touch tablet capacitance-type sensor circuit |
| US8779783B1 (en) * | 2013-03-12 | 2014-07-15 | Cypress Semiconductor Corporation | Mutual capacitance sensing using a self-capacitance sensing device |
| CN204740578U (en) * | 2015-06-30 | 2015-11-04 | 无锡华润矽科微电子有限公司 | Automatic adjust mutual capacitive touch panel of response window width |
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