CN102012763A - Anti-interference coordinate input device and method - Google Patents

Abstract

The invention discloses an anti-interference coordinate input device and method, belonging to the technical field of electronic digital data processing. The device provided by the invention comprises a solid state panel, a control module, a deformation sensor which is electrically connected with the control module and a force sensor, wherein the force sensor is electrically connected with the control module; and when the control module outputs a signal through the force sensor and judges that the force sensor is triggered, the trigger position of the solid state panel is obtained according to the signal output by the deformation sensor. By adopting the scheme in the invention, the deformation signals which are generated by non-contacts and inducted by the deformation sensor can be effectively removed and the device provided by the invention has the function of resisting external interferences.

Description

Anti-interference coordinate input device and method

Technical Field

The invention relates to the field of electric digital data processing, in particular to an anti-interference coordinate input device and an anti-interference coordinate input method.

Background

With the rapid development of electronic information devices, the input interaction between people and the electronic information devices is no longer limited to the operation of keys, but more and more prefers to perform the input interaction by directly clicking a display screen.

In the prior art, by arranging deformation sensors, such as: the resistance-type sensor or the capacitance-type sensor is arranged on the display screen and used as a resistance-type touch panel or a capacitance-type touch panel, so that after a user clicks the touch panel by using input equipment such as fingers or a pen, the clicked coordinate value can be calculated through an electric signal generated by the sensor, and then human-computer interaction is realized through the display screen.

However, in the above solution, the resistive sensor or the capacitive sensor is uniformly disposed on the whole display screen, and the material and thickness of the sensor can reduce the light reaching the display screen and the light transmitted and reflected by the display screen, thereby affecting the display effect of the display screen. Especially for a reflective display screen without backlight, the sensor is arranged on the reflective display screen, so that the reflection brightness of the display screen is reduced, the display effect of the display screen is greatly influenced, and the health of human eyes is damaged.

In order to improve the display effect of the display screen, the current method is to set a deformation sensor below the display screen or outside the display screen, sense the deformation generated by the display screen through the deformation sensor, and determine the touch position according to the signal output by the deformation sensor. However, in practical applications, when a user clicks on a housing of the electronic device or an external force is transmitted to the housing, the vibration of the housing may also deform the display screen, and in this case, if the deformation generated in the display screen is sensed by the deformation sensor, a signal is output and an erroneous operation of the electronic information device is caused.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problem of eliminating the interference of clicking a shell or external pressure on a coordinate input device.

(II) technical scheme

In order to achieve the above technical solution, the present invention provides an anti-interference coordinate input device, including: the solid-state panel, the control module, the deformation sensor electrically connected with the control module and the force-sensitive sensor are electrically connected with the control module, and after the force-sensitive sensor is judged to be triggered by the control module through a signal output by the force-sensitive sensor, a trigger position on the solid-state panel is obtained according to the signal output by the deformation sensor.

In the above solution, the control module includes: a processing unit and a multi-path amplifying unit, wherein,

the processing unit is used for detecting the signals output by the force-sensitive sensor, enabling the multi-path amplifying unit when the signals output by the force-sensitive sensor exceed a preset threshold value, and determining the trigger position on the solid-state panel after processing the signals output by the deformation sensor amplified by the multi-path amplifying unit;

and the multi-path amplifying unit is used for amplifying the signal output by the deformation sensor after receiving the enabling signal of the processing unit.

In the above scheme, the solid panel is a display screen.

In the above scheme, the number of the deformation sensors is multiple, and the deformation sensors are uniformly arranged on the lower side edge of the solid panel.

In the above solution, the force sensor is disposed in the central portion of the lower side of the solid panel.

In the above scheme, the solid panel is a reflective display screen.

In the above scheme, a transparent protection layer is arranged above the solid panel.

In the above scheme, the number of the deformation sensors is multiple, and the deformation sensors are uniformly arranged on the lower side of the transparent protection layer and on the outer side of the edge of the solid panel.

In the above scheme, the force-sensitive sensor is disposed at the lower side of the transparent protection layer and outside the edge of the solid panel.

In the above scheme, the solid-state panel is a transmissive display screen.

The invention also provides an anti-interference method of the coordinate input device, and the coordinate input device comprises: the method comprises the following steps of:

arranging a force-sensitive sensor, and detecting a signal output by the force-sensitive sensor by a control module;

judging that the force-sensitive sensor is triggered according to a signal output by the force-sensitive sensor;

and acquiring a trigger position on the solid-state panel according to the signal output by the deformation sensor.

In the above solution, the determining that the force sensor is triggered according to the signal output by the force sensor includes:

and comparing the signal output by the force-sensitive sensor with a preset threshold value, and judging that the force-sensitive sensor is triggered when the signal output by the force-sensitive sensor exceeds the preset threshold value.

(III) advantageous effects

In the anti-interference coordinate input device and the method provided by the invention, the force-sensitive sensor is arranged in the coordinate input device, and after the force-sensitive sensor is judged to be triggered according to the signal output by the force-sensitive sensor, the triggering position on the solid-state panel is obtained according to the signal output by the deformation sensor.

By adopting the scheme of the invention, the force-sensitive sensor can be triggered only when the surface of the solid panel is clicked, the signal output by the deformation sensor is an effective signal, and the clicking position can be determined according to the signal output by the deformation sensor. According to the scheme of the invention, the deformation signal sensed by the deformation sensor when no clicking force exists on the surface of the solid-state panel can be effectively eliminated, so that the interference on the detection of the clicking position of the deformation sensor caused by the deformation of the solid-state panel due to the vibration of the shell or the external vibration is eliminated, the misoperation of the electronic information equipment is avoided, and the touch characteristic of the equipment is improved.

In addition, when deformation sensor and force sensor all set up the downside at the display screen, the display screen can be reflective display screen, is favorable to protecting the health of people's eye.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of a tamper resistant coordinate input apparatus of the present invention;

FIG. 2 is a schematic diagram of a second embodiment of a tamper resistant coordinate input apparatus of the present invention;

FIG. 3 is a schematic diagram of a control module of the tamper resistant coordinate input apparatus of the present invention;

fig. 4 is a flowchart of the operation of the interference rejection method of the coordinate input apparatus of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The coordinate input device provided by the invention comprises: the force-sensitive sensor is electrically connected with the control module, and after the control module judges that the force-sensitive sensor is triggered according to a signal output by the force-sensitive sensor, a trigger position on the solid-state panel is obtained according to the signal output by the deformation sensor. In the following embodiments, the solid state panel is a display screen.

Force sensitive sensors, such as: a piezoresistive sensor. Deformation can take place for the deformation sensor after the atress to according to the piezoelectricity effect production signal of telecommunication, the deformation sensor commonly used is like: piezoelectric ceramics.

When the surface of the solid-state panel is clicked, the surface of the solid-state panel is deformed, the generated vibration waves are transmitted to the deformation sensor from the clicking position, and the deformation sensor receives the vibration waves and then deforms to generate electric signals. The starting position of the vibration wave, namely the clicking position of the surface of the solid panel can be obtained according to the electric signal generated by the deformation sensor. However, when the external vibration causes the surface of the solid panel to deform, the deformation sensor also deforms due to the vibration of the solid panel and generates an electric signal, and thus obtains the coordinates of the non-click position.

Therefore, due to the different working principles of the force-sensitive sensor and the deformation sensor, the force-sensitive sensor can only detect an effective click signal and cannot determine a specific click position, only when the force-sensitive sensor is triggered and judges that the trigger is an effective click signal, the signal output by the deformation sensor can be used as an effective signal, and after the effective signal is amplified through enabling, the effective signal is processed to obtain the click position on the surface of the solid panel.

Fig. 1 is a schematic structural diagram of a first embodiment of a coordinate input device with interference resistance according to the present invention, the coordinate input device includes: the device comprises ashell 11, adisplay screen 12, adeformation sensor 13, a force-sensitive sensor 14 and acontrol module 15.

Theshell 11 is used for supporting and fixing thedisplay screen 12, thedeformation sensor 13, the force-sensitive sensor 14 and thecontrol module 15;

thedisplay screen 12 is used for generating corresponding vibration according to the clicking force of theinput device 16 and transmitting the generated vibration waves; thedisplay 12 may have various shapes, and the present embodiment is described by taking a rectangle as an example. Here, by clicking thedisplay screen 12 using, for example, a pen, a finger, or the like as theinput device 16, the click position coordinates can be calculated, thereby realizing human-computer interaction.

Adeformation sensor 13 disposed at a lower side of thedisplay screen 12, for generating deformation according to a vibration wave generated on a surface of thedisplay screen 12 and outputting an electrical signal; the initial position of the vibration wave, namely the click position on the surface of the display screen, can be obtained according to the electric signal output by the deformation sensor; the signal output by the deformation sensor is an analog signal, and the waveform, amplitude and phase of the analog signal are related to the material property, click force, click speed and click position of theinput device 16; wherein,deformation sensor 13 can set up a plurality ofly, and this embodiment has set up fourdeformation sensor 13 to set up in the four corners region ofdisplay screen 12 downside through the mode of pasting respectively. The force-sensitive sensor 14 is arranged at the lower side of thedisplay screen 12 in a sticking way and used for outputting a corresponding signal according to the click force applied to the surface of thedisplay screen 12; when the surface of thedisplay screen 12 has no clicking force, no signal is output; wherein, the signal output by the force sensor 14 is an analog signal, and the waveform, amplitude and phase of the analog electrical signal are related to the material property, click force, click speed and click position of theinput device 16; preferably, the force sensitive sensor 14 is disposed in a middle region of the underside of thedisplay screen 12. In this embodiment, the signal output by the force sensor is an electrical signal.

And thecontrol module 15 is used for obtaining the triggering position on the display screen according to the signal output by the deformation sensor after judging that the force sensitive sensor is triggered according to the signal output by the force sensitive sensor.

Therefore, according to the scheme, when the click force exists on the surface of thedisplay screen 12 and is effective, the signal output by the deformation sensor is processed, and the click position coordinate is determined, so that the interference on the click position coordinate caused by the deformation of thedisplay screen 12 due to the vibration of the casing or the external vibration when thedisplay screen 12 has no click force can be avoided.

Here, since the force-sensitive sensor and the deformation sensor are both disposed below the display screen, and do not affect the external light received by the display screen, in order to effectively protect the health of human eyes, preferably, thedisplay screen 12 may be a reflective display screen; in addition, the reflective display screen illuminates the screen by using light reflected by external light, so that the reflective display screen has the advantages of energy conservation, environmental protection and the like. Of course, thedisplay 12 may also be a transmissive display, but the transmissive display does not have the advantage of protecting the health of human eyes because it uses a "light-emitting panel" disposed below the display to display; the light source of the light emitting panel under the transmissive display panel may be, for example, a Light Emitting Diode (LED), a Cold Cathode Fluorescent Lamp (CCFL), an EL cold light sheet, or the like.

Fig. 2 is a schematic structural diagram of a second embodiment of the interference-free coordinate input device of the present invention, which is a variation of the first embodiment, wherein a transparent protection layer 21 is disposed above the display screen 22 to protect the display screen 22, the deformation sensor 23, the force sensor 24, and the control module 25.

In this embodiment, the transparent protection layer 21 may be glass or a transparent acrylic film, and is slightly larger than the display screen 22. To enhance the display effect, the display 22 is preferably a transmissive display, such as a liquid crystal display with a backlight; the display screen 22 may be in various shapes, and the display screen 22 is rectangular in this embodiment. The man-machine interaction is realized by clicking the transparent protection layer 21 by using a pen, a finger and the like as an input device 26, conducting an acting force to the display screen 22 through the transparent protection layer 21, calculating a click position coordinate through a signal output by the deformation sensor 23 after the force sensitive sensor 24 is triggered, and finally obtaining a trigger position generated on the display screen due to the fact that the transparent protection layer is clicked.

The deformation sensor 23 is arranged on the lower side of the transparent protective layer 21, is positioned on the outer side of the edge of the display screen 22, and is used for generating deformation according to vibration generated on the surface of the transparent protective layer 21 and outputting a corresponding electric signal; preferably, four deformation sensors 23 are provided, and the deformation sensors 23 can be disposed in four corner regions of the lower side of the transparent protection layer 21 by means of pasting.

The force-sensitive sensor 24 is arranged on the lower side of the transparent protective layer 21 in a sticking manner, is positioned on the outer side of the edge of the display screen 22, and is used for outputting a corresponding signal according to the click force on the surface of the transparent protective layer 21; when there is no click force on the surface of the transparent protection layer 21, no signal is output; the waveforms, amplitudes and phases of the signals output by the deformation sensor 23 and the force sensor 24 are all related to the material property, the click force, the click speed and the click position of the input device 26. In this embodiment, the signal output by the force sensor is an electrical signal.

And the control module 25 is used for obtaining the triggering position of the transparent protective layer according to the signal output by the deformation sensor 23 after judging that the force-sensitive sensor is triggered according to the signal output by the force-sensitive sensor 24.

Therefore, according to the scheme, the click force exists on the surface of the transparent protection layer 21, when the click force is effective, the electric signal output by the deformation sensor is processed, and the click position coordinate is determined, so that the interference on the click position coordinate caused by the deformation of the transparent protection layer 21 due to the vibration of the shell or the external vibration when the surface of the transparent protection layer 21 has no click force can be avoided.

Fig. 3 is a schematic structural diagram of a control module in the coordinate input device with interference resistance shown in fig. 1 and 2, including: a processingunit 31 and a multiplex amplification unit 32; wherein,

and theprocessing unit 31 is electrically connected with the multi-path amplifying unit 32 and the force-sensitive sensor respectively, and is used for detecting the signals output by the force-sensitive sensor, enabling the multi-path amplifying unit 32 when the signals output by the force-sensitive sensor exceed a preset threshold value, and determining the trigger position after correspondingly processing the signals of the deformation sensor amplified by the multi-path amplifying unit 32. The threshold is the lowest value when the signal output by the force-sensitive sensor is judged to be effective, and can be set according to the actual situation through the processing unit; here, theprocessing unit 31 may be a single chip microcomputer.

And the multi-path amplifying unit 32 is electrically connected with each deformation sensor respectively and is used for amplifying the signals output by the deformation sensors after receiving the enabling signals of the processing unit.

Theprocessing unit 31 performs corresponding processing on the signals of the deformation sensor amplified by the multi-path amplifying unit 32, and specifically includes: the signals of the deformation sensor amplified by the multi-path amplifying unit 32 are collected in real time, analog/digital conversion is carried out on the signals, feature vectors are extracted from the converted digital signals, coordinate feature vectors consistent with the extracted feature vectors are found out from preset coordinate feature quantities corresponding to the coordinates, and then the coordinates of the click position are determined according to the corresponding relation between the coordinates and the coordinate feature vectors.

Based on the above device, the present invention further provides an anti-interference method for a coordinate input device, as shown in fig. 4, including the following steps:

step 400: arranging a force-sensitive sensor in the coordinate input device;

in this step, the coordinate input device includes: the system comprises a solid-state panel, a control module and a deformation sensor electrically connected with the control module, wherein for the coordinate input device shown in figure 1, a force sensor is arranged at the central part of the lower side of the display screen; for the coordinate input device shown in fig. 2, the force sensor is disposed on the lower side of the transparent protective layer and outside the edge of the display screen.

Step 401: detecting the signal output by the force-sensitive sensor and judging whether the force-sensitive sensor is triggered; if the force sensitive sensor is judged to be triggered, executingstep 402; otherwise,step 401 is looped;

in the step, the anti-interference coordinate input device enters an idle waiting state after being started and initialized; detecting a signal output by the force-sensitive sensor in real time, comparing the signal output by the force-sensitive sensor with a preset threshold value, judging that the force-sensitive sensor is triggered when the signal output by the force-sensitive sensor exceeds the preset threshold value, and executingstep 402; otherwise, judging that the force-sensitive sensor is not triggered, and returning to thestep 401; the threshold is the lowest value of the effective signal output by the judgment force-sensitive sensor and can be set according to the actual situation through the processing unit; in this embodiment, the threshold may take 100 mv.

Step 402: and determining a trigger position according to the signal output by the deformation sensor, and then returning to thestep 401.

In the step, when the force-sensitive sensor is judged to be triggered, processing a signal output by the deformation sensor to determine a triggering position; the processing of the signal output by the deformation sensor specifically includes: collecting signals output by each deformation sensor in turn in a time-sharing manner, and amplifying the collected signals; performing analog/digital conversion on the signal, and extracting a feature vector from the converted digital signal; and matching the extracted characteristic quantity with a preset coordinate characteristic quantity corresponding to the coordinates to determine a trigger position, and then returning to thestep 401 and waiting for the next click operation of the input device.

In conclusion, the invention can eliminate the deformation signal generated by non-click induced by the deformation sensor, thereby having the advantage of better anti-interference, being conveniently combined with various electronic equipment and communication equipment, reducing the cost of the electronic equipment and the communication equipment and improving the touch characteristic of the equipment.

The above description is only an embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (12)

1. A tamper resistant coordinate input device comprising: the device comprises a solid panel, a control module and a deformation sensor electrically connected with the control module, and is characterized by further comprising a force sensitive sensor, wherein the force sensitive sensor is electrically connected with the control module, and after the control module judges that the force sensitive sensor is triggered through a signal output by the force sensitive sensor, the triggering position on the solid panel is obtained according to the signal output by the deformation sensor.

2. The tamper resistant coordinate input device of claim 1, wherein the control module comprises: a processing unit and a multi-path amplifying unit, wherein,

the processing unit is used for detecting the signals output by the force-sensitive sensor, enabling the multi-path amplifying unit when the signals output by the force-sensitive sensor exceed a preset threshold value, and determining the trigger position on the solid-state panel after processing the signals output by the deformation sensor amplified by the multi-path amplifying unit;

and the multi-path amplifying unit is used for amplifying the signal output by the deformation sensor after receiving the enabling signal of the processing unit.

3. The tamper resistant coordinate input device of claim 2, wherein the solid state panel is a display screen.

4. The tamper resistant coordinate input device of claim 3, wherein the deformation sensors are plural in number and are uniformly disposed on a lower edge of the solid state panel.

5. A tamper-resistant coordinate input device of claim 4, wherein the force-sensitive sensor is disposed in a central portion of an underside of the solid state faceplate.

6. The tamper resistant coordinate input device of claim 5, wherein the solid state panel is a reflective display screen.

7. A tamper resistant coordinate input device of claim 2 wherein a transparent protective layer is disposed over the solid state panel.

8. The tamper resistant coordinate input device of claim 7, wherein the deformation sensors are plural in number and are uniformly disposed on an underside of the transparent protective layer and outside edges of the solid state panel.

9. A tamper resistant coordinate input device of claim 8 wherein the force sensitive sensor is disposed on an underside of the transparent protective layer outside an edge of the solid state panel.

10. The tamper resistant coordinate input device of claim 9, wherein the solid state panel is a transmissive display screen.

11. A method of interference rejection for a coordinate input device, the coordinate input device comprising: solid-state panel, control module, with control module electrical connection's deformation sensor, its characterized in that includes the following step:

arranging a force-sensitive sensor, and detecting a signal output by the force-sensitive sensor by a control module;

judging that the force-sensitive sensor is triggered according to a signal output by the force-sensitive sensor;

and acquiring a trigger position on the solid-state panel according to the signal output by the deformation sensor.

12. The method of claim 11, wherein determining that the force sensitive sensor is triggered based on the signal output by the force sensitive sensor comprises:

and comparing the signal output by the force-sensitive sensor with a preset threshold value, and judging that the force-sensitive sensor is triggered when the signal output by the force-sensitive sensor exceeds the preset threshold value.

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