WO2022073291A1 - 点自电容屏及触控检测方法、装置 - Google Patents

点自电容屏及触控检测方法、装置 Download PDF

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Publication number
WO2022073291A1
WO2022073291A1 PCT/CN2020/133577 CN2020133577W WO2022073291A1 WO 2022073291 A1 WO2022073291 A1 WO 2022073291A1 CN 2020133577 W CN2020133577 W CN 2020133577W WO 2022073291 A1 WO2022073291 A1 WO 2022073291A1
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Prior art keywords
sensing electrode
electrode unit
sensing
screen
group
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PCT/CN2020/133577
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English (en)
French (fr)
Inventor
叶剑
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武汉华星光电半导体显示技术有限公司
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Priority to US17/278,240 priority Critical patent/US11842008B2/en
Publication of WO2022073291A1 publication Critical patent/WO2022073291A1/zh

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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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G06F3/041662—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using alternate mutual and self-capacitive scanning
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • 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
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the present application relates to the technical field of touch screens, and in particular to a touch detection method for a self-capacitance screen, a corresponding device, and a self-capacitance screen.
  • smart phone flexible AMOLED On-cell touch screen usually adopts mutual capacitance touch screen scheme
  • AMOLED Active Matrix Organic Light-Emitting Diode, refers to active matrix organic light-emitting diode
  • On-cell refers to the touch panel embedded A process between color filter substrate and polarizer
  • mutual capacitance touch screen is Mutual-DOT, DOT is Direct Oncell Touch
  • the mutual capacitance touch screen adopts a combination of continuous conduction horizontal electrode channels and continuous conduction vertical electrode channels.
  • the RC load of the electrode channels is relatively large, especially for large-sized touch screens, and its parasitic capacitance will even exceed the current The range of capabilities that the Mutual Touch IC can support.
  • Corresponding to the mutual capacitive touch screen is the self-capacitive touch screen (Self-DOT).
  • Self-DOT self-capacitive touch screen
  • each electrode is an independent sensor pad unit, so the RC load of each sensor electrode unit is relatively small. Therefore, the large-size touch screen usually adopts the point self-capacitive touch screen solution.
  • the touch signal detection of the self-capacitive touch screen generally involves inputting driving signals to the sensing electrode unit groups group by group, and correspondingly outputting the touched coordinate points according to the variation of the received driving signals.
  • the sensing electrode unit groups group by group, and correspondingly outputting the touched coordinate points according to the variation of the received driving signals.
  • each group of sensing electrode unit groups includes 3 rows of sensing electrode units;
  • a drive signal (eg, a high frequency positive voltage amplitude square wave signal) is scanned. Since the driving signal is inputted group by group of the sensing electrode unit group, there will be a potential difference between the sensing electrode unit group inputting the driving signal and the adjacent sensing electrode unit group not inputting the driving signal, and the potential difference will cause the problem of charge transfer. If charge transfer occurs, the charge signal obtained by scanning is the attenuated signal, which will affect the signal-to-noise ratio (SNR) of the touch screen; and when the signal-to-noise ratio of the touch screen is low, it is easy to cause touch signals
  • SNR signal-to-noise ratio
  • the present application provides a point self-capacitive screen capable of improving the signal-to-noise ratio and Touch detection method and device.
  • an embodiment of the present application provides a point self-capacitive screen touch detection method, including the following steps:
  • the coordinates of the touched point are identified accordingly.
  • the same driving signal is simultaneously input to the sensing electrode unit group to be scanned and its adjacent sensing electrode unit group, and the step further includes: removing the point self-capacitance from the sensing electrode unit to be scanned
  • the sensing electrode unit groups other than the adjacent sensing electrode unit groups are grounded.
  • the adjacent sensing electrode unit group is the next group of sensing electrode units Group;
  • the adjacent sensing electrode unit groups are the previous sensing electrode unit group and the sensing electrode unit group.
  • the next group of sensing electrode unit groups
  • the adjacent sensing electrode unit group is the previous sensing electrode unit group.
  • the embodiments of the present application further provide a point self-capacitive screen touch detection device, including a touch chip, a multiplexer, and multiple sets of sensing electrode unit groups;
  • the touch chip includes a full-screen sensing channel, multiple sets of Induction channel;
  • the multiplexer electrically connects each inductive electrode unit in each group of inductive electrode unit groups to the full-screen inductive channel and the inductive channel respectively;
  • the touch control chip is used for: controlling the corresponding sensing channel, and inputting driving signals to the sensing electrode unit group to be scanned; and, simultaneously, controlling the full-screen sensing channel, and inputting the same sensing electrode unit group to the adjacent sensing electrode unit group of the sensing electrode unit group to be scanned.
  • driving signal and, based on the received driving signal variation, correspondingly identify the coordinates of the point that is touched.
  • the multiplexer electrically connects the sensing electrode units of all sensing electrode unit groups to one full-screen sensing channel, and the multiplexer connects each group of sensing electrodes Each sensing electrode unit in the unit group is electrically connected to one sensing channel correspondingly.
  • the full-screen sensing channel includes a first full-screen sensing channel and a second full-screen sensing channel, which are respectively electrically connected to the sensing electrode units in each group of sensing electrode unit groups;
  • the multiplexer electrically connects each inductive electrode unit in each group of inductive electrode unit groups to one inductive channel correspondingly.
  • the touch chip also controls the corresponding sensing channel at the same time, and the point self-capacitance screen detects the sensing electrode units except the sensing electrode unit group to be scanned and the adjacent sensing electrode unit group. Group ground.
  • the touch chip controls the first full-screen sensing channel to perform the same driving of input Signal function; when the adjacent sensing electrode unit groups of the sensing electrode unit group to be scanned belong to an even group, the touch chip controls the second full-screen sensing channel to perform the function of inputting the same driving signal.
  • the multiplexer includes a first-level multiplexer and a second-level multiplexer that are cascaded with each other; the first full-screen sensing channel passes through the first
  • the second-level multiplexer is electrically connected with the sensing electrode units in each group of sensing electrode unit groups; the second full-screen sensing channel passes through the second-level multiplexer and the first-level multiplexer in turn with the sensing electrode unit groups in each group.
  • the sensing electrode unit is electrically connected.
  • an embodiment of the present application further provides a point self-capacitive screen, the point self-capacitive screen has a point self-capacitive screen touch detection device;
  • the point self-capacitive screen touch detection device includes a touch chip, a multiplexer, and multiple sets of sensing electrode unit groups; the touch chip includes a full-screen sensing channel and multiple sets of sensing channels; the multiplexer selects each Each sensing electrode unit in the sensing electrode unit group is electrically connected to the full-screen sensing channel and the sensing channel, respectively;
  • the touch control chip is used for: controlling the corresponding sensing channel, and inputting driving signals to the sensing electrode unit group to be scanned; and, simultaneously, controlling the full-screen sensing channel, and inputting the same sensing electrode unit group to the adjacent sensing electrode unit group of the sensing electrode unit group to be scanned.
  • driving signal and, based on the received driving signal variation, correspondingly identify the coordinates of the point that is touched.
  • the multiplexer electrically connects the sensing electrode units of all sensing electrode unit groups with one full-screen sensing channel, and the multiplexer connects the sensing electrode units in each group of sensing electrode unit groups.
  • Each sensing electrode unit is electrically connected to one sensing channel correspondingly.
  • the full-screen sensing channel includes a first full-screen sensing channel and a second full-screen sensing channel, which are respectively electrically connected to the sensing electrode units in each group of sensing electrode unit groups; and the multiplex selection The device electrically connects each inductive electrode unit in each group of inductive electrode unit groups to one inductive channel correspondingly.
  • the touch control chip also controls the corresponding sensing channel at the same time, and grounds the point self-capacitance screen except for the sensing electrode unit group to be scanned and the adjacent sensing electrode unit group.
  • the multiplexer electrically connects the sensing electrode units of all sensing electrode unit groups with one full-screen sensing channel, and the multiplexer connects the sensing electrode units in each group of sensing electrode unit groups.
  • Each sensing electrode unit is electrically connected to one sensing channel correspondingly.
  • the multiplexer includes a first-level multiplexer and a second-level multiplexer that are cascaded with each other; the first full-screen sensing channel is selected through the first-level multiplexer
  • the sensor is electrically connected to the sensing electrode units in each group of sensing electrode unit groups; the second full-screen sensing channel passes through the second-level multiplexer and the first-level multiplexer in turn with the sensing electrode units in each group of sensing electrode unit groups. electrical connection.
  • the touch chip controls the first full-screen sensing channel to perform the function of inputting the same driving signal;
  • the touch chip controls the second full-screen sensing channel to perform the function of inputting the same driving signal.
  • the beneficial effects of the present application include: the potential difference between the sensing electrode unit group to be scanned and its adjacent sensing electrode unit group can be eliminated, the problems of charge transfer and signal attenuation can be avoided, the signal-to-noise ratio of the point self-capacitance screen can be improved, and the problem of solving the The failure of touch signal detection and the failure of touch screen function or accidental touch and other problems.
  • Embodiment 1 is a schematic flowchart of a touch detection method for a point self-capacitive screen provided by Embodiment 1;
  • FIG. 2 is a structural block diagram of a point self-capacitive screen touch detection device provided in Embodiment 2;
  • FIG. 3 is a partial circuit diagram of a circuit structure of a full-screen sensing channel, a sensing channel and each sensing electrode unit in the second embodiment;
  • Fig. 4 is the enlarged view of A place of Fig. 3;
  • FIG. 5 is a partial circuit diagram of another circuit structure of the full-screen sensing channel, the sensing channel and each sensing electrode unit in the second embodiment;
  • FIG. 6 is an enlarged view of part B of FIG. 5 .
  • the adjacent sensing electrode unit group may only refer to a group of sensing electrode unit groups adjacent to the sensing electrode unit group to be scanned, or may refer to several groups of sensing electrode unit groups adjacent to the sensing electrode unit group to be scanned. , the following description takes the case of only referring to one group of sensing electrode unit groups as an example.
  • the sensing electrode unit group to be scanned is the uppermost sensing electrode unit group of the point self-capacitance screen, and the adjacent sensing electrode unit group is the next sensing electrode unit group.
  • the uppermost sensing electrode unit group includes the first to third rows of sensing electrode units
  • the adjacent sensing electrode unit groups include 4 to 6 rows of sensing electrode units.
  • the sensing electrode unit group to be scanned is located between the uppermost sensing electrode unit group and the lowermost sensing electrode unit group of the point self-capacitance screen, and the adjacent sensing electrode unit groups are the previous sensing electrode unit group and the next group. Sensing electrode unit group. For example, when the sensing electrode unit group to be scanned includes 4 to 6 rows of sensing electrode units, the previous set of sensing electrode unit groups includes 1 to 3 rows of sensing electrode units, and the next set of sensing electrode unit groups includes 7 to 9 rows of sensing electrodes unit.
  • the adjacent sensing electrode unit group is the previous sensing electrode unit group.
  • the sensing electrode unit group to be scanned includes 28 ⁇
  • the previous set of sensing electrode unit groups includes 25 to 27 rows of sensing electrode units.
  • inputting the same drive signal to the sensing electrode unit group to be scanned and its adjacent sensing electrode unit group at the same time further includes the step of: screening the point self-capacitance from the sensing electrode unit group to be scanned and the adjacent sensing electrode unit
  • the sensing electrode unit groups other than the group are grounded. In this embodiment, all other sensing electrode units are grounded, that is, the potential is kept at zero, which can effectively reduce the power consumption required to touch the self-capacitive touch screen.
  • the same driving signal is input to the adjacent sensing electrode unit group, which can eliminate the sensing electrode unit group to be scanned and its adjacent sensing electrode unit group.
  • the potential difference between the two can avoid the problem of charge transfer and signal attenuation, and can improve the signal-to-noise ratio of the self-capacitive screen. Problems such as signal detection failure and touch screen function failure or accidental touch.
  • the second embodiment correspondingly provides a point self-capacitive screen touch detection device.
  • the device includes a touch chip 100 , a multiplexer 200 and multiple sets of sensing electrode unit groups 300 ; wherein, the touch chip 100 includes a full-screen sensing channel (Full Sensing Channel) 110, multiple sets of sensing channels (Sensing Channel) 120; the multiplexer 200 is used to electrically connect each sensing electrode unit in each sensing electrode unit group 300 to the full-screen sensing channel 110 and the sensing channel 120, respectively.
  • the multiplexer (MUX) 200 may use a 1:10 Demux structure multiplexer.
  • the touch chip 100 is used to: control the corresponding sensing channel, and input driving signals to the sensing electrode unit group to be scanned;
  • the unit group inputs the same driving signal; and, based on the received driving signal variation, the coordinates of the touched point position are correspondingly identified.
  • the touch chip also controls the corresponding sensing channels at the same time, and grounds the sensing electrode unit groups other than the sensing electrode unit group to be scanned and the adjacent sensing electrode unit group of the point self-capacitance screen.
  • all other sensing electrode units are grounded, that is, the potential is kept at zero, which can effectively reduce the power consumption required to touch the self-capacitive touch screen.
  • the full-screen sensing channel and the connection between the sensing channel and each sensing electrode unit are not particularly limited, and only two preferred solutions are provided below:
  • Scheme 1 The multiplexer electrically connects the sensing electrode units of all sensing electrode unit groups with a full-screen sensing channel, and the multiplexer associates each sensing electrode unit in each sensing electrode unit group with a corresponding one.
  • the sensing channel is electrically connected.
  • sensing electrode units Sensor Pad
  • Sensor Pad sensing electrode units
  • the multiplexer (including switches S1 ⁇ S3, T1 ⁇ T3, K1 ⁇ K5) connects all 420 sensing electrode units with 1 A full-screen sensing channel (Full Sensing Channel) is electrically connected, and the 42 sensing electrode units of each sensing electrode unit group are corresponding to the 42 sensing channels (Sensing Channel).
  • Channel_1 to Sensing Channel_42) are electrically connected. Therefore, when detecting touch signals, the sensing channels input drive signals to the corresponding sensing electrode units in a one-to-one manner, and the 42 sensing channels only need 10 times to complete all sensing of the entire touch screen. drive of the electrode unit.
  • the full-screen sensing channel includes a first full-screen sensing channel and a second full-screen sensing channel, which are respectively electrically connected to the sensing electrode units in each group of sensing electrode unit groups; and the multiplexer connects each group of sensing electrode units. Each sensing electrode unit in the group is electrically connected to one sensing channel correspondingly.
  • the full-screen sensing channel in solution 2 includes a first full-screen sensing channel (Full Sensing Channel_1) and a second full-screen sensing channel (Full Sensing Channel_2), which are respectively related to all sensing electrodes in each group of sensing electrode units.
  • the electrode units are electrically connected.
  • the first full-screen sensing channel can be controlled to scan the sensing electrode unit groups of odd groups (such as 1-3 lines, 7-9 lines, etc.), while the second full-screen sensing channel can be controlled to scan even groups (such as 4 ⁇ 9 lines) 6 rows, 10 ⁇ 12 rows, etc.) of the sensing electrode unit group, or vice versa.
  • the touch chip controls the first full-screen sensing channel to perform the function of inputting the same driving signal; the adjacent sensing electrodes of the sensing electrode unit group to be scanned belong to the odd group.
  • the touch control chip controls the second full-screen sensing channel to perform the function of inputting the same driving signal.
  • each full-screen sensing channel in this solution only needs to drive half of the sensing electrode units of the touch screen, which can prevent the problem of insufficient driving capability of a single full-screen sensing channel and improve detection efficiency at the same time.
  • the first full-screen sensing channel and the second full-screen sensing channel are electrically connected to all sensing electrode units in each group of sensing electrode unit groups through a two-level multiplexer. That is, the multiplexer includes a first-level multiplexer (as shown in Figure 5, including switches S1 ⁇ S3, T1 ⁇ T3, K1 ⁇ K5) and a second-level multiplexer (as shown in Figure 5, including switches S1 ⁇ S3, T1 ⁇ T3, K1 ⁇ K5) Switches P1 ⁇ P5, M1, N1); the first full-screen sensing channel is electrically connected to all sensing electrode units in each group of sensing electrode unit groups through the first-level multiplexer, while the second full-screen sensing channel sequentially passes through the second level.
  • the multiplexer includes a first-level multiplexer (as shown in Figure 5, including switches S1 ⁇ S3, T1 ⁇ T3, K1 ⁇ K5) and a second-level multiplexer (as shown in Figure 5, including switches S1 ⁇ S3, T1 ⁇ T3, K1
  • the multiplexer and the first-level multiplexer are electrically connected to all the sensing electrode units in each group of sensing electrode unit groups. Therefore, the second-level multiplexer is a higher level, and the driving capability of the second full-screen sensing channel is stronger than that of the first full-screen sensing channel.
  • the multiplexer electrically connects each sensing electrode unit in each sensing electrode unit group with one sensing channel correspondingly (same as scheme 1).
  • an equivalently reduced compensation circuit is preferably arranged inside the touch chip.
  • the sensing electrode unit group to be scanned is the uppermost sensing electrode unit group of the self-capacitive screen, which includes: Sensor Pad 1-1 to Sensor in the first row Pad 1-14, Sensor in row 2 Pad 2-1 to Sensor Pad 2-14, Sensor Pad 3-1 to Sensor Pad 3-14 in the third row, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the adjacent sensing electrode unit group includes: Sensor Pad 4-1 to Sensor in the fourth row Pad 4-14, Sensor in row 5 Pad 5-1 to Sensor Pad 5-14, Sensor Pad 6-1 to Sensor Pad 6-14 in row 6, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the control process includes the following A1 ⁇ A3:
  • A1 Control all switches K1 and S1 corresponding to 42 sensing electrode units in rows 1 to 3 to be closed, and other switches S2 and S3 corresponding to 42 sensing electrode units in rows 1 to 3 are turned off; the sensing channel of the touch chip Sensing Channel_1 to Sensing Channel_42 inputs drive signals to the 42 sensing electrode units in the 1 ⁇ 3 rows, and receives the return signal. The touch chip determines whether the sensing electrode unit is touched according to the corresponding change of the drive signal and the return signal (change in charge integral amount). ;
  • A2 At the same time, all switches T2 corresponding to 42 sensing electrode units in 4 ⁇ 6 rows are controlled to be closed, and other switches T1 and T3 corresponding to 42 sensing electrode units in 4 ⁇ 6 rows are turned off; the full-screen sensing channel of the touch chip is Full Sensing Channel inputs the same drive signal to the 42 sensing electrode units in the 4 ⁇ 6 rows;
  • the sensing electrode unit group to be scanned includes: Sensor Pad 4-1 to Sensor Pad 4-14 in the fourth row, and Sensor Pad 5-1 to Sensor 5-1 in the fifth row Pad 5-14, Sensor in row 6 Pad 6-1 to Sensor Pad 6-14, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the adjacent sensing electrode unit group includes two groups, one of which includes: the Sensor in the first row Pad1-1 to Sensor Pad 1-14, Sensor Pad 2-1 to Sensor Pad 2-14 in row 2, Sensor Pad 3-1 to Sensor in row 3 Pad 3-14, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad); the other group includes: Sensor Pad 7-1 to Sensor Pad 7-14 in row 7, and Sensor Pad 8 in row 8 -1 to Sensor Pad 8-14, Sensor in row 9 Pad 9-1 to Sensor Pad 9-14, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the control process includes the following B1 ⁇ B3:
  • the sensing electrode unit group to be scanned includes: Sensor Pad 25-1 to Sensor Pad 25-14 in row 25, and Sensor Pad 26-1 to Sensor in row 26 Pad 26-14, Sensor on line 27 Pad 27-1 to Sensor Pad 27-14, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the adjacent sensing electrode unit group includes two groups, one of which includes: Sensor in row 22 Pad22-1 to Sensor Pad 22-14, Sensor Pad 23-1 to Sensor Pad 23-14 on line 23, Sensor Pad 24-1 to Sensor on line 24 Pad 24-14, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad); another group includes: Sensor Pad 28-1 to Sensor Pad 28-14 in row 28, and Sensor Pad 29 in row 29 -1 to Sensor Pad 29-14, Sensor on line 30 Pad 30-1 to Sensor Pad 30-14, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the control process includes the following I1 ⁇ I3:
  • I1 Controls all switches K1 and S1 corresponding to 42 sensing electrode units in rows 25 to 27 to be closed, and other switches S2 and S3 corresponding to 42 sensing electrode units in rows 25 to 27 are turned off; the sensing channel of the touch chip Sensing Channel_1 to Sensing Channel_42 inputs drive signals to the 42 sensing electrode units in the 25 ⁇ 27 rows, and receives the return signal. The touch chip determines whether the sensing electrode unit is touched according to the corresponding change (change in charge integration) between the drive signal and the return signal. ;
  • the sensing electrode unit group to be scanned is the lowermost sensing electrode unit group of the self-capacitance screen, which includes: Sensor Pad 28-1 to Sensor in row 28 Pad 28-14, Sensor on line 29 Pad 29-1 to Sensor Pad 29-14, Sensor Pad 30-1 to Sensor Pad 30-14 in row 30, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the adjacent sensing electrode unit group includes: Sensor Pad 25-1 to Sensor in row 25 Pad 25-14, Sensor on line 26 Pad 26-1 to Sensor Pad 26-14, Sensor Pad 27-1 to Sensor Pad 27-14 in row 27, that is, a total of 3 rows and 14 columns, a total of 42 sensing electrode units (Sensor Pad).
  • the control process includes the following J1 ⁇ J3:
  • scheme 2 The control process of scheme 2 is generally similar to that of scheme 1. As mentioned above, the difference is that scheme 2 can use two full-screen sensing channels (Full Sensing Channel_1 and Full Sensing Channel_2) respectively drive the sensing electrode units of half of the touch screen.
  • Full Sensing Channel_1 and Full Sensing Channel_2 Two full-screen sensing channels
  • the second embodiment can correspond to any solution of the first embodiment, and has the beneficial effects corresponding to the first embodiment, which will not be repeated here.
  • the present application further provides a point self-capacitance screen
  • the point self-capacitance screen includes the point self-capacitance screen touch detection device of any one of the second embodiment, and can implement the point self-capacitance of the second embodiment. All functions of the touch screen detection device.
  • the technical solution protected by the self-capacitance screen at this point can be understood with reference to the second embodiment above, which will not be repeated here.

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Abstract

一种点自电容屏及其触控检测方法、装置。其中，点自电容屏触控检测方法包括：同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号（S1）；基于收到的驱动信号变化量相应识别出受触控的点位坐标（S2）。

Description

点自电容屏及触控检测方法、装置 技术领域
本申请涉及触控屏技术领域，具体涉及一种点自电容屏触控检测方法，以及相应的装置、点自电容屏。
 背景技术
目前，智能手机柔性AMOLED On-cell触控屏通常采用互电容触控屏方案（AMOLED即Active Matrix Organic Light-Emitting Diode，指有源矩阵有机发光二级管；On-cell指将触控面板嵌入到彩色滤光片基板和偏光板之间的一种工艺；互电容触控屏即Mutual-DOT，DOT即Direct Oncell Touch）。
互电容触控屏采用连续导通的横向电极通道和连续导通的纵向电极通道相结合的布局方式，电极通道的 RC负载比较大，尤其是大尺寸触控屏，其寄生电容甚至会超出目前的互电容触控屏芯片（Mutual Touch IC）可以支持的能力范围。与互电容触控屏相对应的是点自电容触控屏（Self-DOT）。点自电容触控屏虽然也包括横向电极和纵向电极，但每个电极为一个独立的感应电极单元（Sensor Pad），故而，每个感应电极单元的RC负载比较小。因此，大尺寸触控屏通常会采用点自电容触控屏方案。
点自电容触控屏的触控信号检测一般是逐组对感应电极单元组输入驱动信号，根据接收到的驱动信号的变化量相应输出受触控的坐标点位。例如，对于一种14列/30行的点自电容触控屏，共有14×30=420个感应电极单元，其每组感应电极单元组包括3行感应电极单元；对该点自电容触控屏进行触控信号检测时，需要从最上一组感应电极单元组（第1~ 3行感应电极单元）至最下一组感应电极单元组（第40~ 42行感应电极单元）依次逐组输入驱动信号（例如，高频正电压幅值方波信号）进行扫描。由于是逐组感应电极单元组输入驱动信号，这便会导致输入驱动信号的感应电极单元组与相邻的未输入驱动信号的感应电极单元组之间存在电势差，该电势差会导致电荷转移问题。若发生电荷转移，扫描得到的电荷信号便是衰减后的信号，因此会影响触控屏的信噪比（SNR）；而当触控屏的信噪比较低时，便容易导致触控信号检测失灵，导致触控屏功能失效或者误触等问题。
 技术问题
针对现有的触控屏在触控信号检测过程中可能出现信噪比较低，并导致触控信号检测失灵这一技术问题, 本申请提供一种能够提高信噪比的点自电容屏及触控检测方法、装置。
 技术解决方案
第一方面，本申请实施例提供一种点自电容屏触控检测方法，包括以下步骤：
同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号；
基于收到的驱动信号变化量相应识别出受触控的点位坐标。
在所述点自电容屏触控检测方法中，同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号，还包括步骤：将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。
在所述点自电容屏触控检测方法中，所述待扫描感应电极单元组为点自电容屏的最上一组感应电极单元组时，其相邻感应电极单元组为下一组感应电极单元组；
所述待扫描感应电极单元组处于点自电容屏的最上一组感应电极单元组和最下一组感应电极单元组之间时，其相邻感应电极单元组为上一组感应电极单元组和下一组感应电极单元组；
所述待扫描感应电极单元组为点自电容屏的最下一组感应电极单元组时，其相邻感应电极单元组为上一组感应电极单元组。
第二方面，本申请实施例还提供一种点自电容屏触控检测装置，包括触控芯片、多路选择器以及多组感应电极单元组；所述触控芯片包括全屏感应通道、多组感应通道；所述多路选择器将各组感应电极单元组中的各个感应电极单元分别与所述全屏感应通道、感应通道电连接；
所述触控芯片用于：控制对应的感应通道，向待扫描感应电极单元组输入驱动信号；以及，同时控制全屏感应通道，向待扫描感应电极单元组的相邻感应电极单元组输入相同的驱动信号；并且，基于收到的驱动信号变化量相应识别出受触控的点位坐标。
在所述点自电容屏触控检测装置中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
在所述点自电容屏触控检测装置中，所述全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
在所述点自电容屏触控检测装置中，所述触控芯片还同时控制对应的感应通道，将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。
在所述点自电容屏触控检测装置中，待扫描感应电极单元组的相邻感应电极单元组属于奇数组时，由所述触控芯片控制所述第一全屏感应通道执行输入相同的驱动信号的功能；待扫描感应电极单元组的相邻感应电极单元组属于偶数组时，由所述触控芯片控制所述第二全屏感应通道执行输入相同的驱动信号的功能。
在所述点自电容屏触控检测装置中，所述多路选择器包括相互级联的第一级多路选择器和第二级多路选择器；所述第一全屏感应通道通过第一级多路选择器与各组感应电极单元组中的感应电极单元电连接；第二全屏感应通道依次通过第二级多路选择器、第一级多路选择器与各组感应电极单元组中的感应电极单元电连接。
第三方面，本申请实施例还提供一种点自电容屏，所述点自电容屏具有一点自电容屏触控检测装置；
所述点自电容屏触控检测装置包括触控芯片、多路选择器以及多组感应电极单元组；所述触控芯片包括全屏感应通道、多组感应通道；所述多路选择器将各组感应电极单元组中的各个感应电极单元分别与所述全屏感应通道、感应通道电连接；
所述触控芯片用于：控制对应的感应通道，向待扫描感应电极单元组输入驱动信号；以及，同时控制全屏感应通道，向待扫描感应电极单元组的相邻感应电极单元组输入相同的驱动信号；并且，基于收到的驱动信号变化量相应识别出受触控的点位坐标。
在所述点自电容屏中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
在所述点自电容屏中，所述全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
在所述点自电容屏中，所述触控芯片还同时控制对应的感应通道，将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。
在所述点自电容屏中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
在所述点自电容屏中，所述多路选择器包括相互级联的第一级多路选择器和第二级多路选择器；所述第一全屏感应通道通过第一级多路选择器与各组感应电极单元组中的感应电极单元电连接；第二全屏感应通道依次通过第二级多路选择器、第一级多路选择器与各组感应电极单元组中的感应电极单元电连接。
在所述点自电容屏中，待扫描感应电极单元组的相邻感应电极单元组属于奇数组时，由所述触控芯片控制所述第一全屏感应通道执行输入相同的驱动信号的功能；待扫描感应电极单元组的相邻感应电极单元组属于偶数组时，由所述触控芯片控制所述第二全屏感应通道执行输入相同的驱动信号的功能。
 有益效果
本申请的有益效果包括：可以消除待扫描感应电极单元组与其相邻的感应电极单元组之间的电势差，避免出现电荷转移以及信号衰减问题，能够提高点自电容屏的信噪比，解决了触控信号检测失灵以及触控屏功能失效或者误触等问题。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是实施例一提供的点自电容屏触控检测方法流程示意图；
图2是实施例二提供的点自电容屏触控检测装置的结构框图；
图3是实施例二中全屏感应通道、感应通道与各感应电极单元的一种电路结构的部分电路图；
图4是图3的A处放大图；
图5是实施例二中全屏感应通道、感应通道与各感应电极单元的另一种电路结构的部分电路图；
图6是图5的B处放大图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
实施例一
请参阅图1，实施例一提供的点自电容屏触控检测方法，以一种具有14列/30行感应电极单元（Sensor Pad）的点自电容触控屏为例，其共有14×30=420个感应电极单元，每组感应电极单元组包括3行感应电极单元；该点自电容屏触控检测方法包括步骤S1~ S2：
S1、同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号；
S2、基于收到的驱动信号变化量相应识别出受触控的点位坐标。
步骤S1中，相邻的感应电极单元组可仅指与待扫描感应电极单元组相邻的一组感应电极单元组，也可指与待扫描感应电极单元组相邻的若干组感应电极单元组，以下以仅指一组感应电极单元组的情况为例进行描述。
本实施例中，待扫描感应电极单元组为点自电容屏的最上一组感应电极单元组，其相邻感应电极单元组为下一组感应电极单元组。例如，最上一组感应电极单元组包括第1~ 3行感应电极单元，则其相邻感应电极单元组包括4~ 6行感应电极单元。
待扫描感应电极单元组处于点自电容屏的最上一组感应电极单元组和最下一组感应电极单元组之间，其相邻感应电极单元组为上一组感应电极单元组和下一组感应电极单元组。例如，待扫描感应电极单元组包括4~ 6行感应电极单元时，其上一组感应电极单元组包括1~ 3行感应电极单元，其下一组感应电极单元组包括7~ 9行感应电极单元。
所述待扫描感应电极单元组为点自电容屏的最下一组感应电极单元组时，其相邻感应电极单元组为上一组感应电极单元组。例如，待扫描感应电极单元组包括28~ 30行感应电极单元时，其上一组感应电极单元组包括25~ 27行感应电极单元。
在一些实施例中，同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号，还包括步骤：将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。本实施例中，将其他所有的感应电极单元均接地，即保持电势为零，可以有效降低点自电容触控屏所需消耗的功耗。
综上，本实施例在向待扫描感应电极单元组输入驱动信号的同时，向相邻的感应电极单元组输入相同的驱动信号，可以消除待扫描感应电极单元组与其相邻的感应电极单元组之间的电势差，避免出现电荷转移以及信号衰减问题，能够提高点自电容屏的信噪比，收到的驱动信号变化量以及输出的受触控坐标点位也更加准确，从而解决了触控信号检测失灵以及触控屏功能失效或者误触等问题。
实施例二
在实施例一的基础上，实施例二相应提供了一种点自电容屏触控检测装置。请参阅图2，该装置包括触控芯片100、多路选择器200以及多组感应电极单元组300；其中，触控芯片100包括全屏感应通道（Full Sensing Channel）110、多组感应通道（Sensing Channel）120；多路选择器200用于将各组感应电极单元组300中的各个感应电极单元分别与全屏感应通道110、感应通道120电连接。作为可选方案，多路选择器（MUX）200可以采用1：10的Demux结构的多路选择器。
本实施例中，触控芯片100的用于：控制对应的感应通道，向待扫描感应电极单元组输入驱动信号；以及，同时控制全屏感应通道，向待扫描感应电极单元组的相邻感应电极单元组输入相同的驱动信号；并且，基于收到的驱动信号变化量相应识别出受触控的点位坐标。
在一些实施例中，触控芯片还同时控制对应的感应通道，将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。本实施例中，将其他所有的感应电极单元均接地，即保持电势为零，可以有效降低点自电容触控屏所需消耗的功耗。
本实施例中，全屏感应通道以及感应通道与各感应电极单元的连接方式不作特别限制，以下仅提供两种优选方案：
（1）方案一：多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
请参阅图3至图4，同样以一种具有14列/30行感应电极单元（Sensor Pad）的点自电容触控屏为例，其具有“Sensor Pad：1-1”至“Sensor Pad：30-14”共420（14×30=420）个感应电极单元；以每3行感应电极单元的集合作为一组感应电极单元组，则其具有10组感应电极单元组，并且每一组感应电极单元组具有42（14×3=42）个感应电极单元。其中，多路选择器（包括开关S1~S3、T1~T3、K1~K5）将所有420个感应电极单元均与1个全屏感应通道（Full Sensing Channel）电连接，同时将每一感应电极单元组的42个感应电极单元对应与42个感应通道（Sensing Channel_1至Sensing Channel_42）电连接。因此，在进行触控信号检测时，感应通道是以一对一的方式向对应的感应电极单元输入驱动信号，并且42个感应通道只需要分时10次便可完成对整个触控屏所有感应电极单元的驱动。
（2）方案二：全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
请参阅图5至图6，方案二中的全屏感应通道包括第一全屏感应通道（Full Sensing Channel_1）和第二全屏感应通道（Full Sensing Channel_2），分别与各组感应电极单元组中的全部感应电极单元电连接。在进行触控检测时，可以控制第一全屏感应通道扫描奇数组（例如1~3行、7~9行等）的感应电极单元组，同时控制第二全屏感应通道扫描偶数组（例如4~6行、10~12行等）的感应电极单元组，或者反之。
即，待扫描感应电极单元组的相邻感应电极单元组属于奇数组时，由触控芯片控制第一全屏感应通道执行输入相同的驱动信号的功能；待扫描感应电极单元组的相邻感应电极单元组属于偶数组时，由触控芯片控制所述第二全屏感应通道执行输入相同的驱动信号的功能。
从而，本方案中每个全屏感应通道均只需要驱动半个触控屏的感应电极单元，可以防止出现单个全屏感应通道驱动能力不足的问题，同时提高检测效率。
在一些实施例中，第一全屏感应通道和第二全屏感应通道通过两级多路选择器与各组感应电极单元组中的全部感应电极单元电连接。即多路选择器包括相互级联的第一级多路选择器（如图5，包括开关S1~S3、T1~T3、K1~K5）和第二级多路选择器（如图5，包括开关P1~P5、M1、N1）；第一全屏感应通道通过第一级多路选择器与各组感应电极单元组中的全部感应电极单元电连接，同时第二全屏感应通道依次通过第二级多路选择器、第一级多路选择器与各组感应电极单元组中的全部感应电极单元电连接。因而，第二级多路选择器为更高一级，且第二全屏感应通道的驱动能力相较于第一全屏感应通道的驱动能力更强。
另外，多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接（同方案一）。
由于方案一的全屏感应通道或者方案二的第一全屏感应通道/第二全屏感应通道需要驱动较多的感应电极单元，因此需要连接较大值的RC电路，这会导致充电时间增加。为此，本实施例优选在触控芯片内部设置等效减少的补偿电路。
以下以方案一为例介绍触控检测时对各感应电极单元的控制过程，请参阅图3-图4，分为10组进行扫描：
第1组扫描：
待扫描感应电极单元组为点自电容屏的最上一组感应电极单元组，其包括：第1行的Sensor Pad 1-1至Sensor Pad 1-14，第2行的Sensor Pad 2-1至Sensor Pad 2-14，第3行的Sensor Pad 3-1至Sensor Pad 3-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。相邻感应电极单元组包括：第4行的Sensor Pad 4-1至Sensor Pad 4-14，第5行的Sensor Pad 5-1至Sensor Pad 5-14，第6行的Sensor Pad 6-1至Sensor Pad 6-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。
控制过程包括以下A1~A3：
A1：控制与1~3行42个感应电极单元对应的所有开关K1、S1闭合，该1~3行42个感应电极单元对应的其他开关S2、S3断开；触控芯片的感应通道Sensing Channel_1至Sensing Channel_42向该1~3行42个感应电极单元输入驱动信号，并接收返回信号，触控芯片根据驱动信号与返回信号的对应变化量（电荷积分量变化）来判断感应电极单元是否有受到触控；
A2：同时，控制与4~6行42个感应电极单元对应的所有开关T2闭合，该4~6行42个感应电极单元对应的其他开关T1、T3断开；触控芯片的全屏感应通道Full Sensing Channel向该4~6行42个感应电极单元输入相同的驱动信号；
A3：同时，余下7~30行的336个感应电极单元对应的所有开关S3、T3闭合，将该7~30行的336个感应电极单元接地GND。
第2组扫描：
待扫描感应电极单元组包括：第4行的Sensor Pad 4-1至Sensor Pad 4-14，第5行的Sensor Pad 5-1至Sensor Pad 5-14，第6行的Sensor Pad 6-1至Sensor Pad 6-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。相邻感应电极单元组包括两组，其中一组包括：第1行的Sensor Pad1-1至Sensor Pad 1-14，第2行的Sensor Pad 2-1至Sensor Pad 2-14，第3行的Sensor Pad 3-1至Sensor Pad 3-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）；另一组包括：第7行的Sensor Pad7-1至Sensor Pad 7-14，第8行的Sensor Pad 8-1至Sensor Pad 8-14，第9行的Sensor Pad 9-1至Sensor Pad 9-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。
控制过程包括以下B1~B3：
B1：控制与4~6行42个感应电极单元对应的所有开关K1、T1闭合，该4~6行42个感应电极单元对应的其他开关T2、T3断开；触控芯片的感应通道Sensing Channel_1至Sensing Channel_42向该4~6行42个感应电极单元输入驱动信号，并接收返回信号，触控芯片根据驱动信号与返回信号的对应变化量（电荷积分量变化）来判断感应电极单元是否有受到触控；
B2：同时，控制与1~3行42个感应电极单元、7~9行42个感应电极单元对应的所有开关S2闭合，该1~3行42个感应电极单元、7~9行42个感应电极单元对应的其他开关S1、S3断开；触控芯片的全屏感应通道Full Sensing Channel向该1~3行42个感应电极单元、7~9行42个感应电极单元输入相同的驱动信号；
B3：同时，余下10~30行的294个感应电极单元对应的所有开关S3、T3闭合，将该10~30行的294个感应电极单元接地GND。
依次类推…
第9组扫描：
待扫描感应电极单元组包括：第25行的Sensor Pad 25-1至Sensor Pad 25-14，第26行的Sensor Pad 26-1至Sensor Pad 26-14，第27行的Sensor Pad 27-1至Sensor Pad 27-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。相邻感应电极单元组包括两组，其中一组包括：第22行的Sensor Pad22-1至Sensor Pad 22-14，第23行的Sensor Pad 23-1至Sensor Pad 23-14，第24行的Sensor Pad 24-1至Sensor Pad 24-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）；另一组包括：第28行的Sensor Pad28-1至Sensor Pad 28-14，第29行的Sensor Pad 29-1至Sensor Pad 29-14，第30行的Sensor Pad 30-1至Sensor Pad 30-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。
控制过程包括以下I1~I3：
I1：控制与25~27行42个感应电极单元对应的所有开关K1、S1闭合，该25~27行42个感应电极单元对应的其他开关S2、S3断开；触控芯片的感应通道Sensing Channel_1至Sensing Channel_42向该25~27行42个感应电极单元输入驱动信号，并接收返回信号，触控芯片根据驱动信号与返回信号的对应变化量（电荷积分量变化）来判断感应电极单元是否有受到触控；
I2：同时，控制与22~24行42个感应电极单元、28~30行42个感应电极单元对应的所有开关T2闭合，该22~24行42个感应电极单元、28~30行42个感应电极单元对应的其他开关T1、T3断开；触控芯片的全屏感应通道Full Sensing Channel向该22~24行42个感应电极单元、28~30行42个感应电极单元输入相同的驱动信号；
I3：同时，余下1~21行的294个感应电极单元对应的所有开关S3、T3闭合，将该1~21行的294个感应电极单元接地GND。
第10组扫描：
待扫描感应电极单元组为点自电容屏的最下一组感应电极单元组，其包括：第28行的Sensor Pad 28-1至Sensor Pad 28-14，第29行的Sensor Pad 29-1至Sensor Pad 29-14，第30行的Sensor Pad 30-1至Sensor Pad 30-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。相邻感应电极单元组包括：第25行的Sensor Pad 25-1至Sensor Pad 25-14，第26行的Sensor Pad 26-1至Sensor Pad 26-14，第27行的Sensor Pad 27-1至Sensor Pad 27-14，即总共3行14列，一共42个感应电极单元（Sensor Pad）。
控制过程包括以下J1~J3：
J1：控制与28~30行42个感应电极单元对应的所有开关K1、T1闭合，该28~30行42个感应电极单元对应的其他开关T2、T3断开；触控芯片的感应通道Sensing Channel_1至Sensing Channel_42向该28~30行42个感应电极单元输入驱动信号，并接收返回信号，触控芯片根据驱动信号与返回信号的对应变化量（电荷积分量变化）来判断感应电极单元是否有受到触控；
J2：同时，控制与25~27行42个感应电极单元对应的所有开关S2闭合，该25~27行42个感应电极单元对应的其他开关S1、S3断开；触控芯片的全屏感应通道Full Sensing Channel向该25~27行42个感应电极单元输入相同的驱动信号；
J3：同时，余下1~24行的336个感应电极单元对应的所有开关S3、T3闭合，将该1~24行的336个感应电极单元接地GND。
至此，完成全部10组扫描。
方案二的控制过程与方案一的大体类似，如前所述，不同之处在于方案二可以用两个全屏感应通道（Full Sensing Channel_1和Full Sensing Channel_2）分别驱动半个触控屏的感应电极单元。
实施例二可以对应执行实施例一的任一方案，并且具备实施例一对应的有益效果，这里不再赘述。
基于以上实施例二，本申请还提供一种点自电容屏，该点自电容屏包括实施例二中任一方案的点自电容屏触控检测装置，并且能够实施实施例二的点自电容屏触控检测装置的所有功能。对于该点自电容屏所保护的技术方案参考以上实施例二进行理解，这里不再赘述。
以上实施例的说明只是用于帮助理解本申请的核心思想，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书中的实施例不应直接理解为对本申请保护范围的限制。

Claims (19)

  1. 一种点自电容屏触控检测方法，其中，包括以下步骤：
    同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号；
    基于收到的驱动信号变化量相应识别出受触控的点位坐标。
  2. 根据权利要求1所述的点自电容屏触控检测方法，其中，同时向待扫描感应电极单元组及其相邻的感应电极单元组输入相同的驱动信号，还包括步骤：将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。
  3. 根据权利要求1所述的点自电容屏触控检测方法，其中，所述待扫描感应电极单元组为点自电容屏的最上一组感应电极单元组时，其相邻感应电极单元组为下一组感应电极单元组；
    所述待扫描感应电极单元组处于点自电容屏的最上一组感应电极单元组和最下一组感应电极单元组之间时，其相邻感应电极单元组为上一组感应电极单元组和下一组感应电极单元组；
    所述待扫描感应电极单元组为点自电容屏的最下一组感应电极单元组时，其相邻感应电极单元组为上一组感应电极单元组。
  4. 一种点自电容屏触控检测装置，其中，包括触控芯片、多路选择器以及多组感应电极单元组；所述触控芯片包括全屏感应通道、多组感应通道；所述多路选择器将各组感应电极单元组中的各个感应电极单元分别与所述全屏感应通道、感应通道电连接；
    所述触控芯片用于：控制对应的感应通道，向待扫描感应电极单元组输入驱动信号；以及，同时控制全屏感应通道，向待扫描感应电极单元组的相邻感应电极单元组输入相同的驱动信号；并且，基于收到的驱动信号变化量相应识别出受触控的点位坐标。
  5. 根据权利要求4所述的点自电容屏触控检测装置，其中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  6. 根据权利要求4所述的点自电容屏触控检测装置，其中，所述全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  7. 根据权利要求4所述的点自电容屏触控检测装置，其中，所述触控芯片还同时控制对应的感应通道，将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。
  8. 根据权利要求7所述的点自电容屏触控检测装置，其中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  9. 根据权利要求7所述的点自电容屏触控检测装置，其中，所述全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  10. 根据权利要求9所述的点自电容屏触控检测装置，其中，待扫描感应电极单元组的相邻感应电极单元组属于奇数组时，由所述触控芯片控制所述第一全屏感应通道执行输入相同的驱动信号的功能；待扫描感应电极单元组的相邻感应电极单元组属于偶数组时，由所述触控芯片控制所述第二全屏感应通道执行输入相同的驱动信号的功能。
  11. 根据权利要求9所述的点自电容屏触控检测装置，其中，所述多路选择器包括相互级联的第一级多路选择器和第二级多路选择器；所述第一全屏感应通道通过第一级多路选择器与各组感应电极单元组中的感应电极单元电连接；第二全屏感应通道依次通过第二级多路选择器、第一级多路选择器与各组感应电极单元组中的感应电极单元电连接。
  12. 一种点自电容屏，其中，所述点自电容屏具有一点自电容屏触控检测装置；
    所述点自电容屏触控检测装置包括触控芯片、多路选择器以及多组感应电极单元组；所述触控芯片包括全屏感应通道、多组感应通道；所述多路选择器将各组感应电极单元组中的各个感应电极单元分别与所述全屏感应通道、感应通道电连接；
    所述触控芯片用于：控制对应的感应通道，向待扫描感应电极单元组输入驱动信号；以及，同时控制全屏感应通道，向待扫描感应电极单元组的相邻感应电极单元组输入相同的驱动信号；并且，基于收到的驱动信号变化量相应识别出受触控的点位坐标。
  13. 根据权利要求12所述的点自电容屏，其中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  14. 根据权利要求12所述的点自电容屏，其中，所述全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  15. 根据权利要求12所述的点自电容屏，其中，所述触控芯片还同时控制对应的感应通道，将点自电容屏除待扫描感应电极单元组、相邻感应电极单元组之外的感应电极单元组接地。
  16. 根据权利要求15所述的点自电容屏，其中，所述多路选择器将全部感应电极单元组的感应电极单元与一个全屏感应通道电连接，并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  17. 根据权利要求15所述的点自电容屏，其中，所述全屏感应通道包括第一全屏感应通道和第二全屏感应通道，分别与各组感应电极单元组中的感应电极单元电连接；并且，所述多路选择器将各组感应电极单元组中的各个感应电极单元对应与一个感应通道电连接。
  18. 根据权利要求17所述的点自电容屏，其中，所述多路选择器包括相互级联的第一级多路选择器和第二级多路选择器；所述第一全屏感应通道通过第一级多路选择器与各组感应电极单元组中的感应电极单元电连接；第二全屏感应通道依次通过第二级多路选择器、第一级多路选择器与各组感应电极单元组中的感应电极单元电连接。
  19. 根据权利要求18所述的点自电容屏，其中，待扫描感应电极单元组的相邻感应电极单元组属于奇数组时，由所述触控芯片控制所述第一全屏感应通道执行输入相同的驱动信号的功能；待扫描感应电极单元组的相邻感应电极单元组属于偶数组时，由所述触控芯片控制所述第二全屏感应通道执行输入相同的驱动信号的功能。
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