CN107765931B - Display screen gesture control circuit and control method based on capacitance sensing - Google Patents
Display screen gesture control circuit and control method based on capacitance sensing Download PDFInfo
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- CN107765931B CN107765931B CN201710893997.1A CN201710893997A CN107765931B CN 107765931 B CN107765931 B CN 107765931B CN 201710893997 A CN201710893997 A CN 201710893997A CN 107765931 B CN107765931 B CN 107765931B
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- 238000001514 detection method Methods 0.000 claims abstract description 99
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
- G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
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Abstract
The invention discloses a gesture control circuit and a gesture control method for a display screen based on capacitance induction, wherein the gesture control circuit comprises a display screen and inductors arranged around the display screen, the inductors are arranged in a strip shape, a shielding layer is arranged at the periphery of each inductor, and a plurality of inductors output induction signals to a detection circuit; the ground terminal of the display screen is disconnected from the ground, and the ground terminal of the display screen, the sensor and the shielding layer are all connected to the oscillation signal source. The method comprises the steps that a detection circuit detects signals output by an inductor and determines the inductor which works currently; loading an oscillating voltage signal to the non-working inductor, so that the non-working inductor and the voltage signal loaded by the current working inductor keep synchronous oscillation; the detection circuit detects a signal output by the current working sensor, and determines a gesture according to the change of the signal output by the current working sensor. The gesture detection method and the gesture detection device can accurately detect the change of the gesture of the user, and are low in production cost.
Description
Technical Field
The invention relates to the field of gesture recognition, in particular to a display screen gesture control circuit based on capacitance sensing and a control method realized by using the circuit.
Background
The existing electronic equipment is more and more intelligent, and as the requirements of people on the electronic equipment are higher and higher, the gesture recognition function of the electronic equipment is more and more important. Most of the existing electronic devices are used for recognizing gestures of users by shooting the gestures of the users through an imaging device, then recognizing images, and recognizing hand action change processes of the users according to the images so as to recognize the gestures of the users.
However, the gesture of the user is identified by the image or the video shot by the camera device, which puts high demands on the image processing capability and the image identification capability of the electronic device, and when the electronic device identifies the image, a large amount of hardware resources, such as a large amount of CPU resources and memory resources, are required, which sometimes causes the electronic device to run slowly.
Therefore, considering that a touch display screen is used to detect a gesture of a user, the conventional capacitive screen detects a capacitance by means of mutual capacitance, for example, the conventional display screen 10 includes an upper glass 11, a common electrode 12 and a lower glass 13 from top to bottom, and a plurality of electrodes 14 are disposed above the upper glass 11, and when a finger of the user is located above a certain electrode 14, the capacitance between the electrodes 14 and the finger changes, so as to sense the position of the finger. However, the existing display screen has a short sensing distance, and basically a user touches the display screen by a finger to sense, and the capacitive screen with the longest sensing distance can only sense a distance of a few centimeters at present, so that the gesture sensing requirement is difficult to meet.
Since there is no electric field coupling between objects of the same potential, by using this principle, a shielding layer can be added between the inductor, the connecting wires and the interfering objects of the display screen, and as shown in fig. 2, a shielding layer 25 is arranged above the upper glass 21 of the display screen 20, and an insulating layer 24 is present between the electrodes 28 of the shielding layer 25. . A common electrode 22 and a lower glass 23 are provided in this order below the upper glass 21.
When a certain inductor 28 is activated, the voltages of the shielding layer 25 and the inductor 28 need to be kept synchronous, so that the interference of the lower layer of the shielding layer 25 is cut off, and the inductor 28 is only coupled with the human body in front or the conductor.
Since there is an electric field between two objects, there is a capacitance between them. The stronger the electric field coupling, the greater the capacitance. Therefore, it is desirable that the electric field between the sensor 28 and the finger is strongest, but is not desirable in most cases due to too many uncontrollable factors such as the environment. Since there are many conductors around the sensor 28 closer to the finger, the electric field coupling is drawn away by these conductors, so the electric field coupling to the finger is very weak. It can be seen that the existing capacitive screen is difficult to meet the gesture recognition requirement.
Disclosure of Invention
The invention mainly aims to provide a gesture control circuit of a display screen based on capacitive sensing, which is large in detection distance.
The invention further aims to provide a gesture control method of the display screen based on capacitive sensing, which is low in cost and good in detection performance.
In order to achieve the main purpose, the gesture control circuit of the display screen based on capacitive sensing provided by the invention comprises a display screen and sensors arranged around the display screen, wherein the sensors are arranged in a strip shape, a shielding layer is arranged on the periphery of each sensor, and a plurality of sensors output sensing signals to a detection circuit; the ground terminal of the display screen is disconnected from the ground, and the ground terminal of the display screen, the sensor and the shielding layer are all connected to the oscillation signal source.
In a preferred embodiment, the shielding layer is disposed below the inductor, and the display screen is disposed below the shielding layer.
Another preferred scheme is that the inductor is arranged on the outer side of the display screen, and the shielding layer is arranged on one side, far away from the display screen, of the inductor.
The further scheme is that the inductor is connected with the detection circuit through a connecting wire, the connecting wire is arranged below the inductor, and a metal layer is wrapped outside the connecting wire.
In a further scheme, a first switch array is arranged between the detection circuit and the inductors, the first switch array is provided with a plurality of first switches, and each inductor is connected with one first switch in series. Further, a voltage buffer and a second switch array are arranged between the oscillating signal source and the inductors, the second switch array comprises a plurality of second switches connected in parallel, each inductor is connected with one second switch in series, and the second switches are electrically connected with the output end of the voltage buffer.
Further, the gesture control circuit of the display screen is also provided with an environment reference sensor, and the environment reference sensor is connected with the detection circuit and outputs signals to the detection circuit.
In order to achieve the other purpose, the gesture control method for the display screen based on capacitive sensing provided by the invention applies a gesture control circuit for the display screen, wherein the gesture control circuit comprises a display screen and sensors arranged around the display screen, the sensors are arranged in a strip shape, and a shielding layer is arranged on the periphery of each sensor; the grounding end of the display screen is disconnected from the ground, and the grounding end of the display screen, the sensor and the shielding layer are all connected to an oscillation signal source; the method comprises the following steps: the detection circuit detects signals output by the sensor and determines the sensor which works currently; loading an oscillating voltage signal to the non-working inductor, so that the non-working inductor and the voltage signal loaded by the current working inductor keep synchronous oscillation; the detection circuit detects a signal output by the current working sensor, and determines a gesture according to the change of the signal output by the current working sensor.
In a preferred embodiment, a first switch array is arranged between the detection circuit and the inductors, the first switch array is provided with a plurality of first switches, and each inductor is connected with one first switch in series; when the detection circuit detects the signal of the currently working sensor, the first switch connected with the working sensor is closed, and the first switch connected with the non-working sensor is opened.
The gesture control circuit of the display screen is further provided with an environment reference sensor; the detection circuit detects a signal output by the environment reference sensor and calculates a difference value between the signal output by the environment reference sensor and a preset threshold value; after detecting the signal output by the currently operating sensor, the detection circuit adds the difference to the detected signal output by the currently operating sensor.
According to the scheme, the plurality of sensors are arranged around the display screen, the sensors are arranged in the shape of a strip, a large number of sensors are prevented from being arranged on the whole display screen, and the production cost of the gesture control circuit can be reduced. And moreover, the grounding end of the display screen is disconnected with the ground, so that the electromagnetic interference of the display screen to the inductor can be reduced, the grounding end of the display screen, the inductor and the shielding layer are all connected to an oscillation signal source, and the inductor, the display screen and the shielding layer can be ensured to receive oscillation signals with the same oscillation frequency, so that the induction distance of the inductor is improved.
And, set up the shielding layer in the below of inductor or set up in one side of inductor, can all effectually keep apart the interference source to reduce the influence of interference source to inductor output signal, make the inductor effectual electric field induction distance farther, the inductor can respond to the farther distance like this, is favorable to the realization of gesture control.
In addition, the connecting wire is wrapped by the metal layer, so that electromagnetic interference of the connecting wire to the inductor can be shielded, and the induction accuracy of the inductor is improved.
In addition, the detection circuit and the plurality of inductors are connected through the plurality of switches of the first switch array, so that the plurality of first switches can be sequentially closed and opened, and only one first switch is closed at the same time, so that the detection circuit can sequentially detect signals on the plurality of inductors. Therefore, through the sequential closing of the plurality of first switches, one detection circuit can detect signals on the plurality of sensors, the number of the detection circuits is reduced, and the production cost of the gesture control circuit is reduced.
On the other hand, the voltage buffer outputs voltage signals to the plurality of inductors through the plurality of second switches on the second switch array, so that the same oscillation frequency of the voltage signals loaded on the plurality of inductors is ensured, and the detection of the signals on the inductors is facilitated.
In addition, the gesture control circuit is provided with an environment reference sensor for detecting the change of the environment, so that other sensors are compensated, namely, the detection circuit compensates the numerical value change caused by the environment change to other working sensors or non-working sensors, so that the detection of the sensors is more accurate.
By applying the gesture control method, when one sensor is determined to be a working sensor, voltage signals with the same oscillation frequency as the working sensor are loaded to the non-working sensor, the display screen grounding end and the shielding layer, so that the sensors have a longer sensing distance, and the gesture detection requirement is met.
In addition, the environment reference sensor is arranged, and signals detected by the environment reference sensor are used as a reference, so that compensation is realized on the sensor arranged around the display screen, and detection errors caused by environment changes can be reduced.
Drawings
Fig. 1 is a schematic view of a conventional touch screen.
Fig. 2 is a schematic diagram of another conventional touch screen.
FIG. 3 is a schematic diagram of a display screen, a sensor, and a shielding layer in an embodiment of a gesture control circuit for a display screen based on capacitive sensing according to the present invention.
FIG. 4 is a schematic diagram of the electrical connection between the display screen and the sensor, shielding layer in the embodiment of the gesture control circuit based on capacitive sensing according to the present invention.
FIG. 5 is a schematic diagram of a display screen, a sensor, and a shielding layer in another embodiment of a gesture control circuit for a display screen based on capacitive sensing according to the present invention.
FIG. 6 is a schematic diagram showing the electrical connection between the sensor and the connection wire in an embodiment of the gesture control circuit for a display screen based on capacitive sensing according to the present invention.
Fig. 7 is a schematic diagram of a switch array for the sensor application of fig. 6.
FIG. 8 is a schematic diagram of electrical connection of another embodiment of a capacitive sensing based display gesture control circuit of the present invention.
FIG. 9 is a schematic diagram of electrical connection of another embodiment of a capacitive sensing based display gesture control circuit of the present invention.
FIG. 10 is a block diagram of electrical connections of an electronic device employing an embodiment of a capacitive sensing based display screen gesture control circuit of the present invention.
FIG. 11 is a block diagram of electrical connections of another embodiment of an electronic device employing capacitive sensing based display screen gesture control circuitry of the present invention.
FIG. 12 is a block diagram of electrical connections of another embodiment of an electronic device employing capacitive sensing based display screen gesture control circuitry of the present invention.
The invention is further described below with reference to the drawings and examples.
Detailed Description
The gesture control circuit of the display screen based on capacitance sensing is used for detecting signals output by a plurality of sensors, so that the gesture of a user can be determined according to the signal change conditions of the plurality of sensors, and the gesture control circuit can be applied to electronic equipment such as mobile phones and tablet computers. The gesture control method of the display screen based on capacitance sensing is a method for detecting gestures of a user by applying the gesture detection circuit.
Display screen gesture control circuit embodiment based on capacitive sensing:
referring to fig. 3, the present embodiment includes a display 35, and a strip-shaped sensor is disposed around the display 35, for example, a sensor 31 is disposed on the upper side of the display 35, a sensor 32 is disposed on the right side, a sensor 33 is disposed on the lower side, and a sensor 34 is disposed on the left side, so that a sensor is disposed on the upper, lower, left and right sides of the display 35. In this embodiment, the sensor may be a strip copper sheet. A shielding layer is provided under each inductor, as shown in fig. 4, a shielding layer 36 is provided under the inductor 32 and a shielding layer 38 is provided under the inductor 34, as seen in the direction A-A of fig. 3. The shielding layer is disposed above the display 35, i.e. the inductor, the shielding layer and the display 35 are disposed from top to bottom. In this way, the shielding layer can shield the interference generated by the display screen 35, and the electromagnetic field of the display screen 35 is prevented from influencing the inductors 31, 32, 33 and 34.
Of course, the shielding layer is not necessarily disposed below the inductor, and in another embodiment, as shown in fig. 5, the inductors 51 and 52 are disposed on two sides of the display screen 50, and the shielding layer 53 corresponding to the inductor 51 is disposed on a side of the inductor 51 away from the shielding layer 50, and the shielding layer 54 corresponding to the inductor 52 is disposed on a side of the inductor 52 away from the shielding layer 50, so that the interference source in a specific direction can be shielded. It can be seen that a shielding layer corresponding to each inductor is disposed on the periphery of each inductor, and the shielding layer may be disposed on the periphery of each inductor to shield the interference source in a specific direction.
In this embodiment the shielding layer may be made of an ITO material, i.e. indium tin oxide, and since in the embodiment shown in fig. 4 a part of the shielding layer will be shielded on the display screen 35, the shielding layer needs to be made of a transparent material. Indium tin oxide is a preferred material for the shield layer because of its transparent nature.
If an electric field exists between two objects, then there is a capacitance between the two objects, the stronger the electric field coupling, the greater the capacitance. It is by this principle that the present invention minimizes the electric field coupling between the sensor and the display 35, while increasing the electric field coupling between the sensor and the user's finger. Therefore, in this embodiment, in order to reduce the influence of the display screen 35 on the sensor, the ground terminal of the display screen 35 needs to be disconnected from the ground. In addition, the ground end of the display screen 35, the shielding layer and the inductor are all loaded with signals with the same oscillation frequency, as shown in fig. 4, an oscillation signal source 40 is provided in this embodiment, the oscillation signal source 40 can emit a voltage signal with a fixed oscillation frequency, and the signal output by the oscillation signal source 40 can be loaded onto the shielding layer, such as the shielding layers 36 and 38, through a voltage buffer 41. In addition, the oscillation signal output by the oscillation signal source 40 can also be output to the ground terminal of the display screen 35 through the voltage buffer 42.
In addition, by utilizing the principle that no electric field coupling exists between equipotential objects, a shielding layer is added between an interference source (such as a display screen 35) and an inductor, and the shielding layer needs to be loaded with an oscillation signal which is the same as that of the inductor in an operating state. Therefore, in this embodiment, the inductor needs to be loaded with the oscillating signal. Therefore, the oscillating signal generated by the oscillating signal source 40 is also required to be applied to the inductor through the voltage buffer.
Since the inductors 31, 32, 33, 34 are all required to be connected to the detection circuit through connection lines, but the connection lines between the inductors and the detection circuit are also interference sources generating interference signals, in order to reduce the influence of the connection lines on the inductors, in this embodiment, the connection lines between the inductors and the detection circuit are arranged below the inductors. By using the same principle that equipotential bodies are not coupled, the invention adopts a non-working inductor as a shielding layer. As shown in fig. 6, assuming that the inductor 34 is the currently active inductor and the other inductors, i.e., the inductors 31, 32, 33 are inactive, it is necessary to load the inactive inductor with a signal having the same oscillation frequency, so that the connection line 45 disposed under the inductor 33 is not coupled with the finger of the user.
However, since the connection wire of the inductor inevitably passes through other inductors, interference will be generated to other inductors, in this embodiment, a metal layer is wrapped on the outer side of the connection wire, for example, a metal layer 46 is wrapped on the outer side of the connection wire 45, and the voltage of the working inductor is applied to the connection wire 45, so that the influence of the connection wire 45 on the inductor can be shielded.
In this embodiment, the signal change on the plurality of sensors is detected by one detection circuit, and as shown in fig. 7, the detection circuit 49 receives the signals of the plurality of sensors. However, if a plurality of sensors output signals to the detection circuit 49 at the same time, the detection circuit 49 cannot determine the signal change condition on each sensor, and therefore, in this embodiment, a first switch array is provided, and the first switch array includes a plurality of first switches, as in this embodiment, the first switch array includes four first switches S1, S2, S3, S4, wherein the first switch S1 is connected between the detection circuit 49 and the sensor 31, the first switch S2 is connected between the detection circuit 49 and the sensor 32, the first switch S3 is connected between the detection circuit 49 and the sensor 33, and the first switch S4 is connected between the detection circuit 49 and the sensor 34.
Thus, by controlling the four first switches S1, S2, S3, S4 to be turned on and off alternately, the detection circuit 49 can sequentially detect the signals output from the four sensors 31, 32, 33, 34. For example, the four first switches S1, S2, S3, S4 may be transistors or field effect transistors, i.e. switches that can be controlled to be turned on and off. When the first switch S1 is closed and the other three first switches are opened, the detection circuit 49 receives the signal output from the inductor 31. And when the first switch S2 is closed and the other three first switches are open, the detection circuit 49 receives the signal output by the sensor 32, and so on. Thus, only one detection circuit 49 is required to provide signals output from a plurality of sensors.
When the detection circuit 49 detects that the signal output by a certain sensor changes, it can be determined that the sensor is the currently operating sensor, for example, the finger of the user is close to the upper portion of the sensor 31, and the signal output by the sensor 31 will change at this time, so the detection circuit 49 determines that the sensor 31 is the currently operating sensor, and the other sensors are non-operating sensors.
In order to increase the sensing distance of the inductor, the non-working inductor needs to be loaded with an electric signal with the same oscillation frequency as the current working inductor, as shown in fig. 7, the oscillation signal source 40 loads voltage signals to the inductors 31, 32, 33 and 34 through the voltage buffer 43. Of course, the voltage buffer 43 loads the voltage signals to the plurality of inductors 31, 32, 33, 34 through the second switch array to output the voltage signals.
In this embodiment, the second switch array includes a plurality of second switches S5, S6, S7, S8, wherein the second switch S5 is connected between the output end of the voltage buffer 43 and the inductor 31, the second switch S6 is connected between the output end of the voltage buffer 43 and the inductor 32, the second switch S7 is connected between the output end of the voltage buffer 43 and the inductor 33, and the second switch S8 is connected between the output end of the voltage buffer 43 and the inductor 34.
Thus, when the detection circuit 49 determines that the currently operating inductor is the inductor 31, the second switches S6, S7, S8 are controlled to be closed so that the voltage buffer 43 loads the oscillation signal to the non-operating inductors 32, 33, 34, the loaded oscillation signal having the same frequency as the oscillation signal loaded to the operating inductor 31.
In addition, in this embodiment, in order to reduce the influence of environmental factors on the sensor, the gesture control circuit is provided with an environmental reference sensor, and the environmental reference sensor is disposed inside the electronic device. For example, the electronic device is a cellular phone, the environmental reference sensor is disposed on the sensing module circuit board, and the environmental reference sensor is electrically connected with the detection circuit 49 and outputs a detection signal. Thus, the detection circuit 49 will record an initial signal value, and if the signal value output by the environmental reference sensor is different from the initial signal value recorded by the detection circuit 49, it indicates that the environmental reference sensor is affected by environmental factors, such as temperature, humidity, etc., and thus drift is caused, so that the detection circuit 49 needs to compensate the detection signals of the sensors 31, 32, 33, 34, so that the signals detected by the sensors 31, 32, 33, 34 are more accurate.
Therefore, the main conception of the invention is that the strip-shaped inductor is arranged around the display screen, and the vibration signals are loaded on the non-working inductor and the grounding end of the display screen, so that the non-working inductor has the same vibration frequency with the vibration signals loaded on the current working inductor, the influence of the non-working inductor on the working inductor is eliminated, and the electric field coupling distance of the inductor is longer.
Based on this concept, the present invention can also be applied to a conventional mutual inductance capacitive screen, as shown in fig. 8, in which criss-cross inductors, such as a transversely extending inductor 61 and a longitudinally extending inductor 62, are provided on the capacitive screen 60, each of which is connected to a detection circuit 65 through a connection wire, and the detection circuit 65 determines which inductor is the currently operating inductor according to the received electrical signal on each inductor, thereby determining the non-operating inductor.
The detection circuit 65 is connected to a plurality of connection lines through a switch array 68, each of the switches in the switch array being connected to one of the connection lines to receive a signal on one of the inductors by gating one of the switches. The signals on the plurality of sensors may be alternately detected by alternately turning on the plurality of switches.
The oscillating signal source 64 is connected to the plurality of inductors through the voltage buffer 66 and the switch array, and when the detecting circuit 65 determines that a certain inductor is the current working inductor, the oscillating signal source 65 outputs an oscillating signal to the non-working inductor, so that the current working inductor and the non-working inductor are loaded with the same oscillating frequency.
Of course, in the embodiment shown in fig. 8, the plurality of sensors 61, 62 are densely arranged on the display screen 60 in a crisscross manner, and in order to make the detection more accurate, it is also necessary to load the display screen 60 with an oscillating electric signal, where the frequency of the oscillating signal loaded on the display screen 60 is the same as the frequency of the oscillating signal loaded on the inactive sensor.
As shown in fig. 9, the display 70 is also provided with criss-cross sensors 72 and 73, the ground terminal 71 of the display 70 is positioned at the lowest part of the display 70, the sensors 72 and 73 each output a detection signal to a detection circuit 74, and a switch array 75 is connected between the detection circuit 74 and the sensors 72 and 73. The oscillating signal source 76 applies an oscillating voltage signal to the inductors 72, 73 via the switch array 77, so that the display ground 71, the active inductor and the inactive inductor are subjected to an electrical signal of the same oscillating frequency.
The gesture control circuit of the present embodiment may be applied to an electronic device such as a mobile phone, a tablet computer, or an electronic book reader, referring to fig. 10, when the gesture control circuit is applied to the mobile phone, the plurality of sensors 80 are electrically connected to the detection circuit 83, and the detection circuit 83 may receive signals output by the plurality of sensors 80. The detection circuit 83 is connected to the touch panel ground 81 and the display panel ground 82 through a voltage buffer. The touch screen grounding end 81 is electrically connected with the mobile phone motherboard 85 through a connecting wire 87, and the display screen grounding end 82 is electrically connected with the mobile phone motherboard 85 through a connecting wire 86.
In another embodiment, the gesture control circuit may be applied to a mobile phone or a computer, referring to fig. 11, the plurality of sensors 90 are electrically connected to the detection circuit 93, and the detection circuit 93 may receive signals output by the plurality of sensors 90. The detection circuit 93 is connected to the touch panel ground 91 and the display panel ground 92 through a voltage buffer. And an inductor 97 is connected between the touch screen grounding end 91 and the tablet computer motherboard 95, and the inductor 97 is used as an isolation element for isolating the grounding end of the tablet computer motherboard 95 from the touch screen grounding end 91. An inductor 96 is connected between the display screen grounding end 92 and the tablet computer motherboard 95, and the inductor 96 is also used as an isolation element to avoid the influence of the grounding end of the tablet computer motherboard 95 on the touch screen grounding end 91.
In another embodiment, an isolation element may be added between the motherboard of the mobile phone or the computer and the detection circuit, as shown in fig. 12, where the plurality of sensors 100 are electrically connected to the detection circuit 103, and the detection circuit 103 may receive signals output by the plurality of sensors 100. In addition, the detection circuit 103 is connected with the touch screen grounding terminal 101 and the display screen grounding terminal 102 through a voltage buffer. The touch screen grounding end 101 is electrically connected with the mobile phone motherboard 105 through a connecting wire, the display screen grounding end 102 is electrically connected with the mobile phone motherboard 105 through a connecting wire, an inductor 104 is connected between the detection circuit 103 and the mobile phone motherboard 105, and the inductor 104 is used as an isolation device to isolate the mobile phone motherboard 105 from the detection circuit 103, so that the mobile phone motherboard 105 is prevented from interfering the detection circuit 103.
Display screen gesture control method embodiment based on capacitance sensing:
the gesture control method of the display screen based on capacitive sensing of the embodiment is applied to the control circuit of the embodiment, for example, the control circuit is applied to a mobile phone, and then a controller of the mobile phone needs to receive signals of the detection circuit, and determines gestures of a user according to the signals output by the detection circuit.
When the gesture control system is started, the detection circuit detects signals output by the sensors, for example, the detection circuit controls the first switches on the first switch arrays to be sequentially turned on, and sequentially detects signals output by the sensors, so that which sensor is the working sensor is judged. For example, in the embodiment of fig. 3, if the finger of the user is located above the sensor 31, the signal output by the sensor 31 is different from the signal output in the initial state, specifically, the oscillation frequency of the signal output by the sensor is changed. The detection circuit determines which emotion is the currently operating inductor by detecting a change in the oscillating frequency on the inductor.
After determining the currently operating inductor, an oscillating voltage signal is applied to the non-operating inductor, for example, the oscillating signal source applies an oscillating signal to the non-operating inductor through the voltage buffer, where the oscillating frequency of the oscillating signal is the same as the oscillating frequency of the oscillating signal applied to the operating inductor. Preferably, the oscillating signal source also loads oscillating electric signals to the grounding end and the shielding layer of the display screen through the voltage buffer, so that the current working sensor, the non-working sensor, the grounding end and the shielding layer of the display screen are all loaded with oscillating signals with the same oscillating frequency.
Then, the detection circuit detects a signal output by the sensor which is currently working, and determines a gesture according to the change of the signal output by the sensor which is currently working. For example, when the finger of the user moves from above the sensor 31 to above the sensor 33, the signal output by the sensor 31 will change, the oscillation frequency gradually returns from the lower oscillation frequency to the initial oscillation frequency, and the oscillation frequency of the signal output by the sensor 33 gradually decreases from the initial oscillation frequency. Therefore, the moving track of the finger can be determined by the change of the oscillation frequency of the signals output by the plurality of sensors, for example, the finger moves from above the sensor 31 to above the sensor 33, that is, the gesture moves from top to bottom.
Similarly, if the oscillation frequency of the signal output by the sensor 34 gradually changes from a lower frequency to an initial frequency and the oscillation frequency of the signal output by the sensor 32 gradually decreases from the initial frequency, it is determined that the finger is moving from left to right, thereby determining the slide gesture.
In order to more accurately detect the signal on the sensor, an environmental reference sensor may be provided on the sensing motherboard, and the detection circuit detects electrical connection with the environmental reference sensor. Therefore, the detection circuit can detect the signal in the initial state of the environment reference sensor, namely the preset threshold value, monitor the real-time signal output by the environment reference sensor, and if the difference exists between the signal output by the environment reference sensor due to the influence of the environment factors and the preset threshold value, the error caused by the environment factors needs to be compensated, so that after the detection circuit detects the signal output by the sensor which works currently, the difference between the signal value output by the environment reference sensor and the preset threshold value is added to the signal output by the sensor which works currently, and the environment compensation of the sensor which works currently is realized.
Of course, if applied to a mutual inductance capacitive screen, an inductor on the capacitive screen may be used as the capacitance for gesture detection. At this time, two systems are required to be set on the mobile phone, one system is used for detecting gestures, and the other system is used for detecting whether a finger clicks a certain point on the display screen. Thus, the sensor on the display screen can be used for sensing gestures and detecting finger touch points. Because the two sets of systems share the sensor, but the detection circuits are different, the circuit for detecting gestures is the detection circuit used in the embodiment above, and mainly detects the change of the oscillation frequency of the signal output by the sensor, and the detection circuit for detecting whether the finger touches the display screen adopts the detection circuit of the existing touch screen.
Therefore, at the beginning, the detection circuit of the gesture control circuit is started, and the detection circuit of the gesture system senses the distance between the finger and the sensor according to the sensor. When the gesture system detects that the distance between the finger and the sensor is close enough, for example, whether the distance between the finger and the sensor is close enough is determined according to the detected capacitance magnitude signal, if the distance is smaller than a certain threshold value, the system of the touch screen is started, namely, whether the finger clicks a certain point of the touch screen is detected. The gesture system is turned off after the touch screen system is activated.
And after the touch screen system cannot detect the touch signal, the gesture system is started again, and the touch system is closed, so that the switching use of the two sets of systems is realized.
Of course, the above-mentioned embodiments are only preferred embodiments of the present invention, and many more variations are possible in practical application, for example, the number of sensors disposed around the display screen, the arrangement of the plurality of sensors, etc., and these variations do not affect the implementation of the present invention, and should also be included in the protection scope of the present invention.
Claims (10)
1. Display screen gesture control circuit based on capacitive sensing includes:
a display screen;
the method is characterized in that:
the inductors are arranged around the display screen and are arranged in a strip shape, a shielding layer is arranged on the periphery of each inductor, and a plurality of inductors output induction signals to the detection circuit;
the grounding end of the display screen is disconnected with the ground, and the grounding end of the display screen, the inductor and the shielding layer are all connected to an oscillation signal source;
the vibration signal source loads vibration signals to the non-working sensor and the display screen grounding end, so that the non-working sensor and the vibration signals loaded by the current working sensor have the same vibration frequency to eliminate the influence of the non-working sensor and the display screen on the working sensor.
2. The capacitive sensing-based display screen gesture control circuit of claim 1, wherein:
the shielding layer is arranged below the inductor, and the display screen is arranged below the shielding layer.
3. The capacitive sensing-based display screen gesture control circuit of claim 1, wherein:
the inductor is arranged on the outer side of the display screen, and the shielding layer is arranged on one side, away from the display screen, of the inductor.
4. A capacitive sensing-based display screen gesture control circuit according to any one of claims 1 to 3, wherein:
the inductor is connected with the detection circuit through a connecting wire, the connecting wire is arranged below the inductor, and a metal layer is wrapped outside the connecting wire.
5. A capacitive sensing-based display screen gesture control circuit according to any one of claims 1 to 3, wherein:
a first switch array is arranged between the detection circuit and the inductors, a plurality of first switches are arranged on the first switch array, and each inductor is connected with one first switch in series.
6. The capacitive sensing-based display screen gesture control circuit of claim 5, wherein:
the voltage buffer and the second switch array are arranged between the oscillation signal source and the inductor, the second switch array comprises a plurality of second switches which are connected in parallel, each inductor is connected with one second switch in series, and the second switches are electrically connected with the output end of the voltage buffer.
7. A capacitive sensing-based display screen gesture control circuit according to any one of claims 1 to 3, wherein:
the gesture control circuit of the display screen is further provided with an environment reference sensor, and the environment reference sensor is connected with the detection circuit and outputs signals to the detection circuit.
8. The display screen gesture control method based on capacitance induction is characterized by applying a display screen gesture control circuit, wherein the circuit comprises a display screen and inductors arranged around the display screen, the inductors are arranged in a strip shape, and a shielding layer is arranged on the periphery of each inductor;
the grounding end of the display screen is disconnected with the ground, and the grounding end of the display screen, the inductor and the shielding layer are all connected to an oscillation signal source;
characterized in that the method comprises the following steps:
the detection circuit detects signals output by the sensor and determines the sensor which works currently;
loading an oscillating voltage signal to the non-working inductor, so that the non-working inductor and the voltage signal loaded by the current working inductor keep synchronous oscillation;
the detection circuit detects signals output by the current working sensor, and determines gestures according to changes of the signals output by the current working sensor.
9. The capacitive sensing-based display screen gesture control method of claim 8, wherein:
a first switch array is arranged between the detection circuit and the inductors, the first switch array is provided with a plurality of first switches, and each inductor is connected with one first switch in series;
when the detection circuit detects the signal of the current working sensor, the first switch connected with the working sensor is closed, and the first switch connected with the non-working sensor is opened.
10. The capacitive sensing-based display screen gesture control method of claim 8 or 9, wherein:
the gesture control circuit of the display screen is also provided with an environment reference sensor;
the detection circuit detects a signal output by the environment reference sensor and calculates a difference value between the signal output by the environment reference sensor and a preset threshold value;
after detecting the signal output by the currently operating sensor, the detection circuit adds the difference to the detected signal output by the currently operating sensor.
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| US20230198523A1 (en) * | 2020-04-13 | 2023-06-22 | Beijing Tashan Technology Co., Ltd. | A hover button sensor unit and method for providing hover button triggering |
| CN111782092B (en) * | 2020-05-22 | 2024-08-30 | 北京他山科技有限公司 | Non-contact type cipher keyboard input device and input method |
| CN111781758A (en) * | 2020-07-03 | 2020-10-16 | 武汉华星光电技术有限公司 | Display screen and electronic equipment |
| CN112265878A (en) * | 2020-09-08 | 2021-01-26 | 上海三菱电梯有限公司 | Targeted non-contact button, elevator button panel and elevator equipment |
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