CN105955526A - Touch device - Google Patents
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- CN105955526A CN105955526A CN201610257583.5A CN201610257583A CN105955526A CN 105955526 A CN105955526 A CN 105955526A CN 201610257583 A CN201610257583 A CN 201610257583A CN 105955526 A CN105955526 A CN 105955526A
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- 230000005540 biological transmission Effects 0.000 claims description 34
- 238000001514 detection method Methods 0.000 claims description 25
- 230000006854 communication Effects 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 15
- 241001422033 Thestylus Species 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000007175 bidirectional communication Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
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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
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention provides a touch device, comprising a capacitance pen and a touch screen. The capacitance pen comprises a penholder, a nib, and a sending circuit and a sending control unit held in the penholder. The sending control unit controls the sending circuit to send signals to the touch screen through the nib. When specific conditions are satisfied, the sending control unit adjusts the sending circuit to send signal amplitude to the touch screen.
Description
Technical Field
The present invention relates to a touch device, and more particularly, to a touch device capable of reducing power consumption of a capacitive pen.
Background
With the development of information technology, electronic devices such as portable mobile devices are increasingly closely related to the lives of people. Such portable mobile devices may receive user input and perform functions desired by the user in accordance with the input. As an input device for receiving user input, a touch device is widely used due to its advantages of small size, light weight, and easy operation.
Touch devices are mainly classified into two types, a resistive touch device and a capacitive touch device. Resistive touch devices are low cost, easy to manufacture, but can only support single finger operation. The capacitive touch device has strong operability and supports multi-finger functions, and thus becomes the first choice of the current touch devices.
The capacitive touch device comprises a capacitive touch screen, and the capacitive touch screen can sense capacitance change caused by touch of a finger (or a stylus) through orthogonal capacitance patterns distributed on the capacitive touch screen, so that the touch position and the touch intensity are measured. The capacitive touch screen can be a transparent panel positioned in front of the capacitive touch device, and can also be an opaque man-machine interaction panel.
The problem of inaccurate positioning is caused because the conductor capable of being sensed by the touch screen needs a large contact area, and the support of the pen is not ideal. Therefore, it is expected that the capacitive touch device can support writing with a pen, and at least includes the functions of fine pen point, suspension sensing, precise positioning, precise pressure sensing, and the like.
The active capacitance pen solves the problems and is used in cooperation with a capacitance touch screen. The active capacitance pen can send high-voltage pulse signals synchronous with the capacitance touch screen, capacitance induction is enhanced, so that the contact area can be reduced, and meanwhile, the user experience is obviously enhanced by the thin pen point.
Fig. 1 shows a schematic diagram of the working principle of a touch device.
As shown in fig. 1, the touch device includes: a panel on which parallel capacitor plates orthogonal to each other are arranged for transmitting and receiving signals; a transmitting capacitor plate arranged on the panel for transmitting the probe wave outwards; the pen 11 receives the synchronization and command information sent by the panel through the pen point and sends a signal wave to the panel through the pen point; the receiving capacitor plate is arranged on the panel and used for receiving the detection wave of the sending capacitor plate and the signal wave of the pen; the analog signal processing unit sends corresponding waveforms according to the capacitor plates selected by the control processing unit or preprocesses signals from the received capacitor plates; and a control processing unit 14, which converts the preprocessed received signal into a digital signal through AD, obtains the touch position through processing, and obtains the position of the pen and the information returned by the pen in the case that the pen is a capacitive pen.
Therefore, the information interaction between the capacitive stylus and the capacitive touch pad is mostly realized through capacitive coupling between the capacitive stylus and the capacitive touch pad, that is, the capacitive touch pad interacts with the capacitive touch pad through the metal structure at the position of the stylus.
Between the tip of the capacitance pen and the touch screenThe coupling capacitance is small, approximately between 100fF and 1.5pF, and this capacitance decreases with the distance between the stylus tip and the touch screen, so that the capacitance of the communication link between the stylus and the touch screen is very large, and the touch screen must increase the amplitude of the signal transmitted by the stylus tip in order to receive the signal transmitted by the stylus tip. The amplitude of the transmitted signal is generally 25V, and the increase of the amplitude inevitably increases the power consumption of the capacitance pen, which is mainly caused by two aspects: first, the power calculation formula P ═ U2An increase in/R, U results in an increase in power P. Secondly, the capacitance pen is powered by a battery, the voltage of the battery is generally 1.2V to 3.7V, and is boosted to 25V, and conversion loss is inevitable in the middle.
Therefore, the capacitance pen in the prior art has the problem of high power consumption.
Disclosure of Invention
The invention provides a touch device which comprises a capacitive pen and a touch screen. The capacitive pen can reduce the amplitude of a transmitted signal according to the condition, so that the power consumption of the capacitive pen is reduced on the premise of ensuring the normal work of the capacitive pen.
The touch device of the invention comprises a capacitance pen and a touch screen, and is characterized in that the capacitance pen comprises: a pen holder; a pen point; the pen holder comprises a sending circuit and a sending control unit, wherein the sending circuit and the sending control unit are accommodated in the pen holder, and the sending control unit controls the sending circuit to send signals to the touch screen through the pen point; when a specified condition is met, the sending control unit adjusts the amplitude of a signal sent by the sending circuit to the touch screen.
Preferably, the capacitance pen further comprises: the touch detection unit is positioned at the pen point and used for detecting whether the pen point is in contact with the touch screen or not, and the specified condition is that the touch detection unit senses the contact between the pen point and the touch screen, wherein the sending control unit controls the sending circuit to send signals to the touch screen at a lower amplitude when the pen point is in contact with the touch screen, and controls the sending circuit to send signals to the touch screen at a higher amplitude when the pen point is not in contact with the touch screen.
Preferably, the contact detection unit is a pressure sensor.
Preferably, the capacitance pen further comprises: the receiving circuit is accommodated in the pen holder and receives signals from the touch screen through the pen point, the touch screen comprises a receiving unit and a transmitting unit, the receiving unit of the touch screen receives the signals transmitted by the pen point, the transmitting unit of the touch screen transmits the signals to the capacitive pen, and the receiving circuit of the capacitive pen receives the signals transmitted by the touch screen through the pen point, wherein the specified condition is that the receiving circuit of the capacitive pen receives amplitude adjustment commands from the touch screen.
Preferably, when the touch screen determines that the amplitude of the signal received from the capacitive pen is higher than a maximum amplitude threshold value, the touch screen transmits the amplitude adjustment command to a receiving unit of the capacitive pen, and, in response to the amplitude adjustment command, the transmission control unit of the capacitive pen decreases the amplitude of the signal transmitted by the transmitting circuit to the touch screen, and, when the touch screen determines that the amplitude of the signal received from the pen point is lower than a minimum amplitude threshold value, the touch screen transmits the amplitude adjustment command to a receiving circuit of the capacitive pen, and, in response to the amplitude adjustment command, the transmission control unit of the capacitive pen increases the amplitude of the signal transmitted by the transmitting circuit to the touch screen.
Preferably, the maximum amplitude threshold corresponds to a saturation value of a signal sent by the capacitive stylus after the signal is amplified by a control circuit of the touch screen.
Preferably, the minimum amplitude threshold is a minimum signal amplitude required to maintain the capacitive stylus in communication with the touch screen.
Preferably, the touch screen further comprises: a distance detection unit located on a main control board of the touch screen, detecting a change in distance between the pen head and the touch screen, and setting at least one intermediate threshold between the maximum amplitude threshold and the minimum amplitude threshold, wherein when the distance detection unit detects a decrease in distance between the pen head and the touch screen, the touch screen determines whether the amplitude of a signal received from the capacitive pen exceeds one of the at least one intermediate threshold, and if so, issues a command to the transmission control unit of the capacitive pen to decrease the amplitude of a signal transmitted by the transmission circuit to the touch screen every time one intermediate threshold is exceeded, and when the distance detection unit detects an increase in distance between the pen head and the touch screen, the touch screen determines whether the amplitude of a signal received from the capacitive pen falls below one of the at least one intermediate threshold, if yes, sending a command to the sending control unit of the capacitance pen every time when the voltage exceeds an intermediate threshold value, and increasing the amplitude of a signal sent to the touch screen by the sending circuit.
Preferably, the distance detection unit senses a coupling capacitance between the pen point and the touch screen, so as to detect a distance between the pen point and the touch screen.
Drawings
FIG. 1 is a schematic diagram of the operation principle of a touch device;
FIG. 2 is a schematic diagram of a touch device according to an embodiment of the invention;
FIG. 3 shows a block diagram of a capacitive stylus of an embodiment of the present invention;
FIG. 4 shows a schematic diagram of one-way communication between an active capacitive pen and a touch screen;
FIG. 5 shows a schematic diagram of the two-way communication between an active capacitive pen and a touch screen;
fig. 6A and 6B are schematic diagrams illustrating a first embodiment of adjusting the amplitude of a transmission signal by a touch device according to the present invention;
fig. 7 is a schematic diagram illustrating a second embodiment of adjusting the amplitude of a transmission signal by using a touch device according to the present invention;
FIGS. 8A and 8B are further schematic diagrams illustrating a second embodiment of the touch device for adjusting the amplitude of a transmitted signal according to the present invention;
FIG. 9 shows a further block diagram of the capacitive stylus of an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the capacitive stylus provided by the present invention is described in detail below with reference to the accompanying drawings and the detailed description. In these drawings, the same or corresponding components are denoted by the same reference numerals. The following is only a preferred embodiment of the capacitive stylus of the present invention, and the present invention is not limited to the following configuration.
Referring to fig. 2, the touch device of the present invention includes a capacitive pen 10 and a touch screen 20. The capacitive stylus 10 will be described in detail below.
Fig. 3 shows a block diagram of a capacitive stylus according to an embodiment of the present invention.
As shown in fig. 3, the capacitance pen 10 of the present invention includes: a barrel 100; a pen point 102; a transmission circuit 110 and a transmission control unit 104 accommodated in the cartridge 100. The sending control unit 104 controls the sending circuit 110 to send signals to the touch screen 20 (not shown in the figure) through the pen point 102. The transmission control unit 104 is configured to adjust the amplitude of the signal transmitted by the transmission circuit 110 to the touch panel 20 via the stylus 102 when a prescribed condition is satisfied.
The capacitive stylus 10 of the present invention is described in detail below with reference to fig. 4-7.
The interaction mode between the capacitive pen and the touch screen mainly includes two types: one-way communication and two-way communication.
When the interaction mode between the capacitive pen and the touch screen is single-item communication, the pen point of the capacitive pen only includes the pen point, and is used for sending a signal to the touch screen 20. When the interaction between the capacitive pen 10 and the touch screen 20 is bidirectional communication, referring to fig. 9, here, the pen tip 102 includes a pen tip 1021 and a coil 1022 located at the periphery of the position where the pen tip 102 contacts the pen holder 100. The tip 1021 and coil 1022 are used to send and receive signals to and from the touch screen 20, respectively.
Fig. 4 and 5 show schematic diagrams of these two communication modes, respectively.
As shown in fig. 4, in the unidirectional communication method, the capacitive stylus 10 includes a transmission circuit 110. The sending circuit 110 sends a signal S1 to the touch screen 20 through the pen head. The touch screen 20 receives the signal S1 sent by the capacitive pen 10, and thus performs a corresponding operation. In this communication mode, the capacitive stylus 10 only transmits signals to the touch screen 20 and does not receive signals from the touch screen 20.
As shown in fig. 5, in the bidirectional communication method, the capacitive stylus 10 includes a transmission circuit 110 and a reception circuit 112. The sending circuit 110 sends a signal S1 to the touch screen 20 through the pen head, and the touch screen 20 receives a signal S1. On the other hand, the touch screen 20 sends a signal S2 to the capacitive pen 10, and the receiving circuit 112 of the capacitive pen 10 receives the signal S2 through the pen head. In this communication mode, the capacitive stylus 10 both transmits signals to the touch screen 20 and receives signals from the touch screen 20.
In both communication modes, the capacitive stylus 10 sends a signal to the touch screen 20. The capacitive stylus 10 of the present invention adjusts the amplitude of the transmission signal through the transmission control unit 104, thereby reducing the power consumption of the capacitive stylus 10.
How to adjust the amplitude of the transmission signal is explained in detail below with reference to fig. 6 to 8.
Fig. 6A and 6B are schematic diagrams illustrating a touch device according to a first embodiment of the present invention adjusting the amplitude of a transmission signal.
In the first embodiment, the capacitive stylus 10 includes only a transmitting unit and does not include a receiving unit, i.e., the above-described unidirectional communication manner. The capacitive pen 10 may include a contact detection unit 108, which is located at the pen head and detects whether there is contact between the pen head and the touch screen 20.
When the touch detection unit 108 senses that there is no contact between the pen point and the touch screen 20, the sending control unit 104 controls the pen point to send a signal to the touch screen 20 at a higher amplitude V1'; when the touch detection unit 108 senses the contact between the pen point and the touch screen 20, the sending control unit 104 controls the pen point to send a signal to the touch screen 20 with a lower amplitude V2'.
The contact detection unit 108 may be any element capable of detecting a contact state. For example, the contact detection unit 108 may be a pressure sensor.
Fig. 7 is a schematic diagram illustrating a second embodiment of adjusting the amplitude of a transmission signal by using a touch device according to the present invention.
In fig. 7, the capacitive pen 10 further includes a receiving circuit 112 housed within the pen body that receives signals from the touch screen 20. The touch screen 20 also includes a receiving unit and a transmitting unit (not shown). The receiving unit of the touch screen 20 receives the signal sent by the pen head, and the sending unit of the touch screen 20 sends the signal to the capacitive pen 10.
When the receiving circuit 112 of the capacitive stylus 10 receives the amplitude adjustment command from the touch screen 20, the sending control unit 104 adjusts the amplitude of the signal sent by the sending circuit 110 to the touch screen 20 through the stylus.
This is explained in more detail below with reference to fig. 7.
The transmitting circuit 110 of the capacitive stylus 10 transmits a signal with an amplitude V to the touch screen 20.
When the touch screen determines that the amplitude V of the signal received from the stylus 10 is too large, e.g., above a predefined maximum amplitude threshold, the touch screen 20 sends an amplitude adjustment command to the receiving circuit 112 of the stylus 10. After receiving the amplitude adjustment command, the transmission control unit 104 of the capacitive stylus 10 reduces the amplitude V of the signal transmitted by the transmission circuit 110 to the touch screen 20.
In addition, when the touch screen 20 determines that the amplitude V of the signal received from the stylus 10 is too small, for example, below a predefined minimum amplitude threshold, the touch screen 20 sends an amplitude adjustment command to the receiving circuit 112 of the stylus 10. Upon receiving the amplitude adjustment command, the transmission control unit 104 of the capacitive stylus 10 increases the amplitude V of the signal transmitted by the transmission circuit 110 to the touch screen 20.
Here, the maximum amplitude threshold is, for example, a saturation value of a signal sent by the corresponding capacitive stylus 10 after being amplified by the touch screen control circuit. The minimum amplitude threshold is the minimum signal amplitude required to maintain the capacitive stylus 10 in communication with the touch screen 20.
A second embodiment of the present invention is described in detail below with reference to fig. 8A and 8B.
Fig. 8A and 8B are further schematic diagrams illustrating the touch device according to the second embodiment of the invention adjusting the amplitude of the transmission signal.
In fig. 8A and 8B, the touch screen 20 further includes a distance detection unit 114, which is located on a main control board (not shown) of the touch screen 20 and detects a distance change between the pen point and the touch screen 20.
As shown in fig. 8A, the capacitive stylus 10 sends a signal to the touch screen 20 at an amplitude V1. At the same time, the capacitive stylus 10 is brought closer to the touch screen 20, e.g., a process in which the user is ready to write on the touch screen 20. In this process, the touch screen 20 determines whether the received signal amplitude exceeds the required signal amplitude, and if so, sends a command to the capacitance pen 10, and the sending control unit 104 of the capacitance pen 10 reduces the amplitude of the sending signal of the sending circuit 110 to V2. Thereby enabling a low power consumption of the capacitive stylus 10.
In one embodiment of the present invention, at least one intermediate threshold is set between the maximum amplitude threshold and the minimum amplitude threshold, and when the distance detection unit 114 detects that the distance between the pen tip and the touch screen 20 is reduced, the touch screen 20 determines whether the amplitude of the signal received from the capacitive pen 10 exceeds one of the at least one intermediate threshold.
If yes, every time an intermediate threshold is exceeded, a command is sent to the transmission control unit 104 of the capacitive stylus 10 to reduce the amplitude of the signal transmitted by the transmission circuit 110 to the touch screen 20.
When the distance detection unit 114 detects that the distance between the pen tip and the touch screen 20 increases, the touch screen 20 determines whether the amplitude of the signal received from the capacitive pen 10 is lower than one of the at least one intermediate threshold.
If so, every time an intermediate threshold is exceeded, a command is issued to the transmit control unit 104 of the stylus 10 to increase the amplitude of the signal transmitted by the transmit circuit 110 to the touch screen 20.
Specifically, for example, two intermediate thresholds, i.e., a first intermediate threshold and a second intermediate threshold, are defined between the maximum amplitude threshold and the minimum amplitude threshold, and the second intermediate threshold is larger than the first intermediate threshold.
In this case, when the distance detection unit 114 detects that the distance between the pen tip and the touch screen 20 is decreasing, the touch screen 20 determines whether the amplitude of the signal received from the capacitive pen 10 exceeds a first intermediate threshold. If not, no action is taken by the touch screen 20. If yes, a command is sent to the transmission control unit 104 of the capacitive stylus 10 to reduce the amplitude of the signal transmitted by the transmission circuit 110 to the touch screen 20.
Subsequently, the distance detecting unit 114 continues to detect the distance between the pen point and the touch screen 20. And the touch screen 20 determines whether the amplitude of the signal received from the stylus 10 exceeds a second intermediate threshold. If not, no action is taken by the touch screen 20. If so, a command is issued to the transmission control unit 104 of the capacitive stylus 10 to again reduce the amplitude of the signal transmitted by the transmission circuit 110 to the touch screen 20.
On the other hand, when the distance detection unit 114 detects that the distance between the pen tip and the touch screen 20 is increasing, the touch screen 20 determines whether the amplitude of the signal received from the capacitive pen 10 is lower than a second intermediate threshold. If not, no action is taken by the touch screen 20. If so, a command is issued to the transmission control unit 104 of the capacitive stylus 10 to increase the amplitude of the signal transmitted by the transmission circuit 110 to the touch screen 20.
Subsequently, the distance detecting unit 114 continues to detect the distance between the pen point and the touch screen 20. And the touch screen 20 determines whether the amplitude of the signal received from the stylus 10 is below a first intermediate threshold. If not, no action is taken by the touch screen 20. If so, a command is issued to the transmission control unit 104 of the capacitive stylus 10 to increase the amplitude of the signal transmitted by the transmission circuit 110 to the touch screen 20 again.
In the above embodiment, two intermediate thresholds are used, but the present invention is not limited to the case of two intermediate thresholds. More or fewer intermediate thresholds may be employed by one skilled in the art depending on the circumstances.
In addition, in the present invention, the distance detecting unit 114 senses the coupling capacitance between the pen head and the touch screen 20, thereby detecting the distance between the pen head and the touch screen 20.
As shown in fig. 8A and 8B, according to the principle of capacitive coupling, when the distance between the pen point and the touch screen 20 is large, the coupling capacitance C1 between them is small. As the distance between the pen point and the touch screen 20 decreases, the coupling capacitance between the pen point and the touch screen becomes C2. The distance detecting unit 114 detects the change of the distance between the pen point and the touch screen 20 indirectly by detecting the change of the coupling capacitance.
By using the touch device provided by the invention, the power consumption of the capacitive pen can be effectively reduced on the premise of ensuring the communication quality between the capacitive pen and the touch screen, the trouble of frequent battery replacement or charging of a user is avoided, and the touch device is more convenient to use.
The above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Such variations and modifications are also to be considered within the scope of the present invention.
Claims (9)
1. A touch device comprising a capacitive pen and a touch screen, wherein the capacitive pen comprises: a pen holder; a pen point; the pen holder comprises a sending circuit and a sending control unit, wherein the sending circuit and the sending control unit are accommodated in the pen holder, and the sending control unit controls the sending circuit to send signals to the touch screen through the pen point; wherein,
when a specified condition is met, the sending control unit adjusts the amplitude of a signal sent by the sending circuit to the touch screen.
2. The touch device of claim 1, wherein the capacitive stylus further comprises: a contact detection unit located at the pen point for detecting whether the pen point contacts with the touch screen or not, and
the specified condition is that the contact detection unit senses the contact between the pen point and the touch screen, wherein the sending control unit controls the sending circuit to send a signal to the touch screen at a lower amplitude when the pen point is in contact with the touch screen, and controls the sending circuit to send a signal to the touch screen at a higher amplitude when the pen point is not in contact with the touch screen.
3. The touch device of claim 2, wherein the contact detection unit is a pressure sensor.
4. The touch device of claim 1, wherein the capacitive stylus further comprises: the receiving circuit is accommodated in the penholder and receives signals from the touch screen through the pen point, the touch screen comprises a receiving unit and a sending unit, the receiving unit of the touch screen receives the signals sent by the pen point, the sending unit of the touch screen sends the signals to the capacitive pen, and the receiving circuit of the capacitive pen receives the signals sent by the touch screen through the pen point
The prescribed condition is that a receiving circuit of the capacitive stylus receives an amplitude adjustment command from the touch screen.
5. The touch device of claim 4, wherein the touch screen sends the amplitude adjustment command to the receiving unit of the capacitive stylus when the touch screen determines that the amplitude of the signal received from the capacitive stylus is above a maximum amplitude threshold, and
in response to the amplitude adjustment command, the transmission control unit of the capacitance pen reduces the amplitude of a signal transmitted by the transmission circuit to the touch screen, and
when the touch screen judges that the amplitude of the signal received from the pen point is lower than a minimum amplitude threshold value, the touch screen sends the amplitude adjustment command to a receiving circuit of the capacitance pen, and
in response to the amplitude adjustment command, the sending control unit of the capacitance pen raises the amplitude of a signal sent by the sending circuit to the touch screen.
6. Touch device according to claim 5, wherein the maximum amplitude threshold corresponds to a saturation value of a signal sent by the capacitive stylus amplified by a control circuit of the touch screen.
7. The touch device of claim 5, wherein the minimum amplitude threshold is a minimum signal amplitude required to maintain the capacitive stylus in communication with the touch screen.
8. The touch device of claim 5, wherein the touch screen further comprises: a distance detection unit, located on a main control board of the touch screen, detecting a change in distance between the pen tip and the touch screen, and setting at least one intermediate threshold between the maximum amplitude threshold and the minimum amplitude threshold, wherein,
when the distance detection unit detects that the distance between the pen point and the touch screen is reduced, the touch screen judges whether the amplitude of the signal received from the capacitive pen exceeds one of the at least one intermediate threshold, if so, every time the amplitude exceeds one intermediate threshold, a command is sent to the sending control unit of the capacitive pen, the amplitude of the signal sent by the sending circuit to the touch screen is reduced, and in addition, the touch screen judges whether the amplitude of the signal received from the capacitive pen exceeds one of the at least one intermediate threshold, and the sending control unit of the capacitive pen sends a command to reduce
When the distance detection unit detects that the distance between the pen point and the touch screen is increased, the touch screen judges whether the amplitude of the signal received from the capacitive pen is lower than one of the at least one intermediate threshold, if so, a command is sent to the sending control unit of the capacitive pen every time the amplitude of the signal is lower than one intermediate threshold, and the amplitude of the signal sent to the touch screen by the sending circuit is increased.
9. The touch device of claim 8, wherein the distance detection unit senses a coupling capacitance between the pen head and the touch screen to detect a distance between the pen head and the touch screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610257583.5A CN105955526A (en) | 2016-04-22 | 2016-04-22 | Touch device |
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| CN201610257583.5A CN105955526A (en) | 2016-04-22 | 2016-04-22 | Touch device |
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Application publication date: 20160921 |