CN106022020B - Optical detection touch screen unlocking device and method of mobile terminal - Google Patents
Optical detection touch screen unlocking device and method of mobile terminal Download PDFInfo
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- CN106022020B CN106022020B CN201610325112.3A CN201610325112A CN106022020B CN 106022020 B CN106022020 B CN 106022020B CN 201610325112 A CN201610325112 A CN 201610325112A CN 106022020 B CN106022020 B CN 106022020B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
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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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
Abstract
The invention discloses an optical detection touch screen unlocking device and method of a mobile terminal, wherein the optical detection touch screen unlocking device comprises an optical detection module, a voltage processing module, a light emitting module and a control module; when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the light detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal; the voltage processing module converts the photovoltage signal into a driving signal and outputs the driving signal to control the light emitting module to emit light; the light detection module generates a corresponding starting voltage signal according to the light reflected by the light-emitting module shielded by the finger; the control module unlocks the screen according to the starting voltage signal; according to the invention, the automatic unlocking is realized by automatically emitting light and detecting the reflected light generated by finger shielding without using a touch screen, so that the condition that the touch unlocking cannot be realized due to partial or total damage of the touch screen can be avoided, and the defects of the touch unlocking technology are overcome.
Description
Technical Field
The invention relates to the technical field of mobile terminals, in particular to an optical detection touch screen unlocking device and method of a mobile terminal.
Background
The unlocking mode of the intelligent mobile terminal (such as a smart phone and a tablet personal computer) usually adopts touch unlocking, for example, a hand strokes a corresponding gesture on a touch screen to complete unlocking. This requires the user to touch the mobile terminal and the unlocking mode is relatively simple. If part of touch points on the touch screen are damaged, even the screen is broken, the intelligent mobile terminal may not be unlocked. Therefore, the smart mobile terminal has a defect in touch unlocking, and no relevant person considers the influence and solution of the technology at present.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an optical detection touch screen unlocking device of a mobile terminal and a method thereof, and aims to solve the problem that touch unlocking cannot be performed due to partial or total damage of an existing touch screen.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an optical detection touch screen unlocking device of a mobile terminal comprises an optical detection module, a voltage processing module, a light emitting module and a control module;
when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the light detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal; the voltage processing module converts the photovoltage signal into a driving signal and outputs the driving signal to control the light emitting module to emit light; the light detection module generates a corresponding starting voltage signal according to the light reflected by the light-emitting module shielded by the finger; and the control module unlocks the screen according to the starting voltage signal.
In the optical detection touch screen unlocking device of the mobile terminal, a light sensing area is arranged on the mobile terminal, the light sensing area is opposite to an optical detection module and a light emitting module which are arranged on a circuit board, light emitted by the light emitting module is reflected into the light sensing area when being shielded by fingers, and the optical detection module detects ambient light and reflected light in the range of the light sensing area.
In the optical detection touch screen unlocking device of the mobile terminal, the optical detection module comprises a photosensitive unit, a proximity detection unit and an optical detection unit;
the photosensitive unit generates a corresponding photovoltage signal according to the brightness of the ambient light;
when the approach detection unit detects that an object is in a preset distance above the light sensing area, a request signal is output to the control module to request to start the light sensing unit;
when the light detection unit is started, the light reflected by the light emitting module is shielded by the finger, and a corresponding starting voltage signal is generated.
In the optical detection touch screen unlocking device of the mobile terminal, the voltage processing module comprises a comparison unit and a voltage stabilizing unit;
the comparison unit compares the photovoltage signal with a reference voltage signal;
the voltage stabilizing unit performs voltage boosting and reducing processing on the optical voltage signal according to the comparison result and outputs a driving signal to control the light emitting module to emit light.
In the optical detection touch screen unlocking device of the mobile terminal, the control module comprises a conversion unit, a central processing unit and an unlocking unit;
the conversion unit amplifies the starting voltage signal by a preset multiple and judges whether the amplified voltage value is within a preset range or not; if yes, the unlocking request signal is output to the central processing unit; otherwise, identifying as invalid;
and the central processing unit starts the optical detection unit according to the request signal on one hand, and calls a corresponding unlocking request instruction according to the effective unlocking request signal and sends the unlocking request instruction to the unlocking unit for unlocking on the other hand.
An optical detection touch screen unlocking method of a mobile terminal comprises the following steps:
step A, when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the light detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal;
b, converting the photovoltage signal into a driving signal by a voltage processing module, and outputting and controlling a light emitting module to emit light;
c, during unlocking, the light detection module shields the light reflected by the light emitting module according to the finger to generate a corresponding starting voltage signal; and the control module unlocks the screen according to the starting voltage signal.
In the step a, the control module starts a photosensitive unit in the optical detection module to generate a corresponding optical voltage signal according to the brightness of ambient light, and also starts the proximity detection unit to detect whether an object is in a preset distance above the light sensing area, and the optical detection unit is not started.
In the optical detection touch screen unlocking method for the mobile terminal, the step B specifically includes:
step B1, comparing the photovoltage signal with a reference voltage signal by a comparison unit in the voltage processing module;
and step B2, the voltage stabilizing unit performs voltage boosting and reducing processing on the optical voltage signal according to the comparison result, and outputs a driving signal to control the light emitting module to emit light.
In the optical detection touch screen unlocking method for the mobile terminal, the step C specifically includes:
step C1, when the approach detection unit detects that an object is in the preset distance above the light sensing area, a request signal is output to the central processing unit;
step C2, the central processing unit starts the light detection unit according to the request signal, and the light detection unit generates a corresponding starting voltage signal according to the light reflected by the finger shielding light emitting module;
step C3, the conversion unit amplifies the starting voltage signal by a preset multiple and judges whether the amplified voltage value is within a preset range; if yes, the unlocking request signal is output to the central processing unit; otherwise, identifying as invalid;
and step C4, the central processing unit calls the corresponding unlocking request instruction according to the effective unlocking request signal and sends the unlocking request instruction to the unlocking unit for unlocking.
Compared with the prior art, the optical detection touch screen unlocking device and the optical detection touch screen unlocking method for the mobile terminal provided by the invention have the advantages that when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the optical detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal; the voltage processing module converts the photovoltage signal into a driving signal and outputs the driving signal to control the light emitting module to emit light; the light detection module generates a corresponding starting voltage signal according to the light reflected by the light-emitting module shielded by the finger; the control module unlocks the screen according to the starting voltage signal; according to the invention, the automatic unlocking is realized by automatically emitting light and detecting the condition that the finger shields the light emitting module, and a touch screen is not used, so that the condition that the touch screen cannot be unlocked by touch due to partial or total damage can be avoided, and the defects of the touch unlocking technology are overcome.
Drawings
Fig. 1 is a block diagram of a structure of an optical detection touch screen unlocking device of a mobile terminal provided by the invention.
Fig. 2 is a flowchart of an optical detection touch screen unlocking method of a mobile terminal provided by the invention.
Detailed Description
The invention provides an optical detection touch screen unlocking device and method of a mobile terminal. In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the optical detection touch screen unlocking device provided by the present invention is disposed on a circuit board of a mobile terminal, and includes an optical detection module 10, a voltage processing module 20, a light emitting module 30, and a control module 40. The mobile terminal is provided with a light sensing area, the light sensing area is opposite to the light detection module 10 and the light emitting module 30 on the circuit board, when the light emitted by the light emitting module 30 is blocked, the light can be reflected into the light sensing area, and then the light detection module 10 mainly detects the ambient light and the reflected light in the range of the light sensing area. The light sensing area may be disposed outside the display screen, such as the top or upper portion (both front and back) of the mobile terminal. This does not affect the screen display. The light emitted from the light emitting module 30 can be easily identified by using soft colored light without glaring.
When the mobile terminal starts the screen locking mode, the control module 40 locks the screen and starts the light detection module 10. The light detection module 10 detects ambient light and generates a corresponding light voltage signal. The voltage processing module 20 converts the optical voltage signal into a driving signal and outputs a driving signal to control the light emitting module 30 to emit light. When the unlocking is required, the finger blocks the light sensing area for a preset time (for example, 2 seconds), and the light emitted by the light emitting module 30 is reflected back to the light sensing area. The light detection module 10 detects light reflected by the light emitting module shielded by the finger, and generates a corresponding start voltage signal according to the reflected light. And the control module 40 unlocks the screen according to the starting voltage signal.
In this embodiment, the light detecting module 10 includes a photosensitive unit 110, a proximity detecting unit 120, and a light detecting unit 130. The voltage processing module 20 includes a comparing unit 210 and a voltage stabilizing unit 220. The control module 40 includes a conversion unit 410, a central processor 420 and an unlocking unit 430.
When the screen locking mode is started, the central processor 420 locks the screen and starts the light sensing unit 110 and the proximity detection unit 120, the light sensing unit 110 generates a corresponding photovoltage signal according to the brightness of the ambient light, the light sensing unit 110 can adopt a phototriode to detect the brightness of the ambient light, the phototriode amplifies the light radiation energy by β times and outputs a current signal β i, if the base current of the phototriode is Ib and the collector current is Ic, the ambient light is amplified by β times through the phototriode, the output driving current (i.e., the collector current) is Ic = β Ib., the collector impedance of the phototriode is Rc, and the photovoltage signal output by the phototriode is 1= Ic Rc.
The light emitting module 30 may use a light emitting diode to emit light. Assuming that the maximum current allowed to pass through the light emitting diode is Iled, the maximum photovoltage signal Vo2= Iled × Rc can be output by the phototriode. Since the maximum current Iled allowed to pass by the light emitting diode and the collector resistance Rc of the phototransistor are fixed, the voltage value of the maximum photovoltage signal Vo2 is constant.
To avoid excessive light/dim of the ambient light, the light voltage signal Vo1 is too large/too small, resulting in the led being damaged/dimly lit. The present embodiment requires the optical voltage signal to be processed by the voltage processing module 20. The comparing unit 210 compares the light voltage signal Vo1 with a reference voltage signal (i.e., a maximum light voltage signal Vo 2). The voltage stabilizing unit 220 performs a voltage boosting and reducing process on the optical voltage signal Vo1 according to the comparison result, and outputs a driving signal to control the light emitting module 30 to emit light.
The method specifically comprises the following steps: when the photo voltage signal Vo1 is greater than the reference voltage signal, it indicates that the brightness of the ambient light is bright, the comparing unit 210 outputs a first comparison signal to turn on the voltage-reducing circuit in the voltage-stabilizing unit 220, and performs voltage-reducing filtering on the photo voltage signal Vo1 to output a driving signal to control the light-emitting module 30 to emit light. When the light voltage signal Vo1 is smaller than the reference voltage signal, it indicates that the brightness of the ambient light is dark, the comparing unit 210 outputs a second comparison signal to turn on the voltage boosting circuit in the voltage stabilizing unit 220, and performs voltage boosting processing on the light voltage signal Vo1 to output a driving signal to control the light emitting module 30 to emit light. The voltage value of the driving signal is equal to the maximum light voltage signal Vo 2. Through the voltage boosting and reducing processing of the voltage stabilizing unit 220, no matter whether the ambient light is dark or bright, a stable driving signal can be output to light the light emitting module 30, so that the light detection unlocking under any ambient light is realized.
In practical implementation, if the light voltage signal Vo1=0 generated by the light sensing unit 110 according to the brightness of the ambient light, it indicates that there is no ambient light. At this time, it is equivalent to that the photo voltage signal Vo1 is smaller than the reference voltage signal, and the subsequent processing is the same as the case where the photo voltage signal Vo1 is smaller than the reference voltage signal, which is not described herein again.
When the unlocking is required, the finger blocks the light sensing area for a predetermined time, and at this time, when the proximity detection unit 120 detects that an object (finger) is located within a predetermined distance above the light sensing area, a request signal is output to the cpu 420. The central processor 420 activates the light detection unit 130 according to the request signal.
When the light detection unit 130 is started, a corresponding starting voltage signal is generated according to the reflected light generated by the finger shielding. The light detection unit 130 is operated only when the finger is close to the finger, and is not operated at ordinary times, so that the light detection unit 130 can avoid mistakenly detecting the ambient light as the reflected light. In order to avoid detecting the light emitted from the nearby light emitting module 30 when the photo detection unit 130 is activated, a light shielding isolation layer may be disposed between the photo detection unit 130 and the light emitting module 30, for example, black light shielding cloth is used to shield the light of the light emitting module 30, so that the photo detection unit 130 can only detect the light entering from the outside of the light sensing area.
The photo detection unit 130 may employ a photodiode, and the reflected light passes through the photodiode to form a corresponding voltage signal. It should be understood that the light reflected by the finger is different from the light reflected by other objects because the surfaces and the areas in contact with the light are different, and the voltage value and the waveform of the voltage signal formed by the light reflected by the finger and the voltage signal formed by the light reflected by other objects are different in the photodetection unit 130; and, since the reflected light is weak, the amplitude of the formed voltage signal is also small. In order to identify the small signal conveniently and accurately identify whether the reflected light is reflected by a finger or reflected by other objects, in this embodiment, the starting voltage signal is amplified by a preset multiple through the conversion unit 410, whether the voltage value of the amplified starting voltage signal is within a preset range is determined, if yes, the amplified starting voltage signal is identified as valid (namely, the starting voltage signal formed by the light reflected by the finger), analog-to-digital conversion is performed, and a digital unlocking request signal is output to the central processing unit 420; otherwise it is recognized as invalid (i.e. a voltage signal formed by light reflected by other objects) and does not participate in the subsequent processing.
The central processing unit 210 calls a corresponding unlocking request instruction according to the valid unlocking request signal and sends the unlocking request instruction to the unlocking unit 430 for unlocking.
Based on the optical detection touch screen unlocking device of the mobile terminal, the invention also provides an optical detection touch screen unlocking method of the mobile terminal, please refer to fig. 2, and the optical detection touch screen unlocking method includes:
s100, when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the light detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal;
s200, converting the photovoltage signal into a driving signal by a voltage processing module, and outputting and controlling a light emitting module to emit light;
s300, when unlocking is carried out, the light detection module shields the light reflected by the light emitting module according to the finger to generate a corresponding starting voltage signal; and the control module unlocks the screen according to the starting voltage signal.
The light detection module comprises a photosensitive unit, a proximity detection unit and a light detection unit. In step S100, the control module first activates the light sensing unit to generate a corresponding light voltage signal according to the brightness of the ambient light. The approach detection unit also starts to detect whether an object exists within a preset distance above the light sensing area. The light detection unit is temporarily not started to avoid misoperation caused by detecting ambient light.
The voltage processing module comprises a comparison unit and a voltage stabilizing unit. The photo voltage signal is compared with a reference voltage signal by a comparison unit in step S200. The voltage stabilizing unit performs voltage boosting and reducing processing on the optical voltage signal according to the comparison result and outputs a driving signal to control the light emitting module to emit light.
The control module comprises a conversion unit, a central processing unit and an unlocking unit. When unlocking is required, the user holds a finger over the light-sensitive area for 2 seconds. In step S300, when the proximity detection unit detects an object within a predetermined distance above the light sensing area, a request signal is output to the cpu to request the light sensing unit to be activated. The central processing unit starts the light detection unit according to the request signal. The finger reflects the light emitted from the light emitting module. When the light detection unit is started, the light reflected by the light emitting module is shielded by the finger, and a corresponding starting voltage signal is generated. The conversion unit amplifies the starting voltage signal by a preset multiple and judges whether the amplified voltage value is within a preset range or not; if yes, the unlocking request signal is output to the central processing unit; otherwise, it is identified as invalid. And the central processing unit calls the corresponding unlocking request instruction according to the effective unlocking request signal and sends the unlocking request instruction to the unlocking unit for unlocking.
In summary, the mobile terminal of the present invention emits light according to the ambient light, and the finger blocks the reflected light generated by the light to unlock the mobile terminal; the operation is convenient, and the lock can be normally unlocked under any ambient light; the touch screen is not used, so that the condition that the touch screen cannot be unlocked by touching due to partial or total damage of the touch screen can be avoided, and the defects of the touch unlocking technology are overcome.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (5)
1. An optical detection touch screen unlocking device of a mobile terminal is characterized by comprising an optical detection module, a voltage processing module, a light emitting module and a control module;
when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the light detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal; the voltage processing module converts the photovoltage signal into a driving signal and outputs the driving signal to control the light emitting module to emit light; the light detection module generates a corresponding starting voltage signal according to the light reflected by the light-emitting module shielded by the finger; the control module unlocks the screen according to the starting voltage signal;
the light detection module comprises a photosensitive unit, a proximity detection unit and a light detection unit;
the photosensitive unit generates a corresponding photovoltage signal according to the brightness of the ambient light;
when the approach detection unit detects that an object is in a preset distance above the light sensing area, a request signal is output to the control module to request to start the light sensing unit;
when the light detection unit is started, the light reflected by the light emitting module is shielded by a finger, and a corresponding starting voltage signal is generated;
the optical detection unit works only when the finger is close to the optical detection unit and does not work at ordinary times; a shading isolation layer is arranged between the light detection unit and the light emitting module;
the voltage processing module comprises a comparison unit and a voltage stabilizing unit;
the comparison unit compares the photovoltage signal with a reference voltage signal;
the voltage stabilizing unit performs voltage boosting and reducing processing on the optical voltage signal according to the comparison result, outputs a driving signal to control the light emitting module to emit light, and the voltage value of the driving signal is equal to the reference voltage signal.
2. A light detection touch screen unlocking device for a mobile terminal as claimed in claim 1, wherein a light sensing area is disposed on the mobile terminal, the light sensing area is opposite to the light detection module and the light emitting module disposed on the circuit board, light emitted by the light emitting module is reflected into the light sensing area when being blocked by a finger, and the light detection module detects ambient light and reflected light within the light sensing area.
3. The optical detection touch screen unlocking device of the mobile terminal according to claim 2, wherein the control module includes a conversion unit, a central processing unit and an unlocking unit;
the conversion unit amplifies the starting voltage signal by a preset multiple and judges whether the amplified voltage value is within a preset range or not; if yes, the unlocking request signal is output to the central processing unit; otherwise, identifying as invalid;
the central processing unit starts the optical detection unit according to the request signal, calls a corresponding unlocking request instruction according to the effective unlocking request signal and sends the unlocking request instruction to the unlocking unit for unlocking.
4. An optical detection touch screen unlocking method of a mobile terminal is characterized by comprising the following steps:
step A, when the mobile terminal starts a screen locking mode, the control module locks a screen and starts the light detection module; the light detection module detects the environment brightness and generates a corresponding light voltage signal;
b, converting the photovoltage signal into a driving signal by a voltage processing module, and outputting and controlling a light emitting module to emit light;
c, during unlocking, the light detection module shields the light reflected by the light emitting module according to the finger to generate a corresponding starting voltage signal; the control module unlocks the screen according to the starting voltage signal;
when the screen locking mode is started, the control module starts the photosensitive unit and the approach detection unit, and the photosensitive unit generates a corresponding photovoltage signal according to the brightness of ambient light; when the approach detection unit detects that an object is in a preset distance above the light sensing area, a request signal is output to the control module to start the light sensing unit; when the light detection unit is started, a corresponding starting voltage signal is generated according to reflected light generated by finger shielding;
the optical detection unit works only when the finger is close to the optical detection unit and does not work at ordinary times; a shading isolation layer is arranged between the light detection unit and the light emitting module;
the step B specifically comprises the following steps:
step B1, comparing the photovoltage signal with a reference voltage signal by a comparison unit in the voltage processing module;
and step B2, the voltage stabilizing unit performs voltage boosting and reducing processing on the optical voltage signal according to the comparison result, outputs a driving signal to control the light emitting module to emit light, and the voltage value of the driving signal is equal to the reference voltage signal.
5. The optical detection touch screen unlocking method of the mobile terminal according to claim 4, wherein the step C specifically includes:
step C1, when the approach detection unit detects that an object is in the preset distance above the light sensing area, a request signal is output to the central processing unit;
step C2, the central processing unit starts the light detection unit according to the request signal, and the light detection unit generates a corresponding starting voltage signal according to the light reflected by the finger shielding light emitting module;
step C3, the conversion unit amplifies the starting voltage signal by a preset multiple and judges whether the amplified voltage value is within a preset range; if yes, the unlocking request signal is output to the central processing unit; otherwise, identifying as invalid;
and step C4, the central processing unit calls the corresponding unlocking request instruction according to the effective unlocking request signal and sends the unlocking request instruction to the unlocking unit for unlocking.
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| CN107862197A (en) * | 2017-12-11 | 2018-03-30 | 广州视源电子科技股份有限公司 | Touch screen unlocking method and device, storage medium, service end |
| CN108376250B (en) * | 2018-02-26 | 2020-06-02 | 京东方科技集团股份有限公司 | Fingerprint identification device, preparation method thereof and touch panel |
| CN108966410B (en) * | 2018-05-28 | 2020-09-01 | 乐思灯具（上海）有限公司 | LED lamp controller, LED lamp and control method thereof |
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| CN104182097B (en) * | 2014-08-26 | 2017-11-10 | Tcl通讯（宁波）有限公司 | For preventing the touch control terminal and its method of proximity transducer erroneous judgement |
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