CN102830855B - A kind of optical multi-point touch screen controller and control method with anti-dewing function - Google Patents
A kind of optical multi-point touch screen controller and control method with anti-dewing function Download PDFInfo
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Abstract
The invention discloses a kind of optical multi-point touch screen controller and the control method with anti-dewing function, aim to provide and a kind of there is the optical multi-point touch screen controller of anti-dewing function and a kind of optical multi-point touch screen control method with anti-dewing function.Controller provided by the invention comprises sensor interface control module, lighting control module, glass heats control module, linear array images data processing unit and internal register.By control method of the present invention, optical multi-point touch screen controller completes the optical calibrating work of touch-screen and generates calibration scale under optical calibrating mode of operation, simultaneously in the normal mode of operation, the multiple point touching operation of optical multi-point touch screen fast and accurate response optical touch screen under the rugged surroundings of the easy condensation of humidity is realized in conjunction with calibration scale.
Description
Technical field
The present invention relates to touch screen controller and control method technical field, specifically a kind of optical multi-point touch screen controller and control method with anti-dewing function.
Background technology
At present, touch-screen, as a kind of man-machine interaction input equipment conventional in electronic product, replaces traditional keyboard, mouse action by relying on its convenience and intuitive gradually in some sector application.Optical multi-point touch screen is as a kind of up-to-date human-computer interaction device, resistive touch screen can be made up, capacitive touch screen, surface acoustic wave touch screen cannot be applied to the deficiency that large scale touches display field, but commercial optical formula touching technique in wet condition at present, cannot normally use because of optical component surface condensation.
Most of touch screen controller technology for be the non-optical touch-screens such as sound wave type, resistance-type, condenser type, " adaptive frequency touchscreen controller and the method utilizing adaptive frequency controller to control touch-screen " of such as Pinheiro contact system Co., Ltd's application, application number is CN00820025.4, and this patent provides a kind of method and apparatus of acoustic touch screen controller of operating frequency requirements of adaptive character touch-screen; The application number of such as ST-Ericsson Co., Ltd.'s application is " touch screen controller " of CN200980153476.6 again, the application number of Qualcomm Inc's application is " low-power touch screen controller " of CN200980112115.7, and " resistive touch screen screen body, touch screen controller and the method for identifying multiple touch points " of the application CN200810210113.9 of Biyadi Co Ltd's application, the touch screen controller that these three patents describe is the controller being applicable to resistive touch screen.
Newer optical touch screen controller technology cannot solve the problem that touch-screen normally works in wet condition at present, such as NextWindow company application " " application number is PCT/US2009/033624/200980108845.X to solve the system and method for multiple point touching sight of optical touch screen, the optical touch screen that this patent describes in a humidity environment, the lens surface of its imaging arrangement can congeal into the little water droplet of one deck, can not imaging and cause touch-screen normally to work, be not thus suitable for the rugged surroundings of moist easily condensation; " the Optical Touch Control System and Method Thereof " of the application number that DUNG LAN-RON applies for for another example to be application number that " the Optical Touch Control Method and Apparatus Thereof " of US20090473183 and ACER INC apply for be JP2010007198, the method for toch control of these patents description can not solve the problem of optical touch screen condensation cisco unity malfunction in wet condition.
Summary of the invention
The object of the present invention is to provide a kind of optical multi-point touch screen controller and the control method with anti-dewing function, also accurately can respond the multiple point touching operation of optical touch screen fast, prevent optical component to lose efficacy because of condensation in wet condition, thus realize touch-screen and work under the rugged surroundings of the easy condensation of humidity.
The invention provides a kind of optical profile type multi-touch controllers with anti-dewing function, this controller comprises sensor interface control module 10, lighting control module 20, glass heats control module 30, linear array images data processing unit 40, internal register 50.
Sensor interface control module 10 is by line scan image sensor, relative humidity sensor and the control signal needed for peripheral circuit work thereof in interface circuit transmission optics formula multi-point touch panel mask, receive differential serial linear array images data and serial relative humidity data, and the conversion process that differential data turns single ended data is carried out to differential serial linear array images data.The associated lamp chain of the infrared LED lamp bar of the light source as a setting that lighting control module 20 pairs of optical multi-point touch screen masks are installed carries out switch control rule.Glass heats control module 30 pairs of relative humidity data carry out serial data and turn Synchronous data dispose, the relatively humidity threshold value of current relative humidity data and internal register 50 setting, judge whether to need to carry out electrical heating to glass can be heated, simultaneously glass heats control module 30 generates relative humidity sensor and the serial samples clock signal needed for serial ADC work thereof and chip selection signal, and is transferred to the relative humidity sensor peripheral circuit in optical multi-point touch screen mask by the interface circuit of sensor interface control module 10.Linear array images data processing unit 40 is when optical calibrating mode of operation, and the optimum configurations according to optical calibrating mode of operation processes linear array images data, sends the nominal data obtained to main frame, and the calibration scale that download host generates; Linear array images data processing unit 40 is when normal mode of operation, optimum configurations according to normal mode of operation processes linear array images data, result is carried out relevant resolving according to calibration scale, thus obtain the screen geometry coordinate of optical multi-point touch screen, and send back to main frame with the form of packet, thus complete the touch control of optical multi-point touch screen.Internal register 50 arranges the exposure time values under humidity threshold value, optical calibrating and normal work two kinds of mode of operations.
Described sensor interface control module 10 comprises: interface connector 11 and spi bus controller 12.Line scan image sensor and operational amplifier, serial ADC and spi bus controller are welded on the drive plate in optical multi-point touch screen mask, relative humidity sensor is mounted on outside trapezoidal imaging cartridge close to can electrically heated glass sheet place, and be connected with drive plate by cable, operational amplifier and the serial ADC of relative humidity sensor are welded on drive plate.Be connected with drive plate by interface connector 11 with touch screen controller of the present invention.Interface connector 11 sends the various signals needed for drive plate work to drive plate, comprises the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH; The chip selection signal CS_ needed for serial ADC work of line scan image sensor; The serial samples clock signal SCLK_H needed for serial ADC work of relative humidity sensor and chip selection signal CS_H; Differential serial sampled clock signal SCLK+, SCLK-in mask needed for the work of spi bus controller.Interface connector 11 receives differential serial linear array images data SDA+, SDA-and the relative humidity data SDA_H of drive plate output.Spi bus controller 12 comprises receiver Receiver and driver Driver.Receiver Receiver receives differential serial linear array images data SDA+, SDA-, and convert thereof into serial linear array images data SDA, driver Driver receives serial samples clock signal SCLK, and converts thereof into differential serial sampled clock signal SCLK+, SCLK-.
Described lighting control module 20 comprises: lighting signal generator 21, LED backlight driver 22 and calibration switch 23.Lighting signal generator 21 is according to control clock signal Φ M, integrate-dump signal ICG, the electronic shutter signal SH generation lighting control signal CtrSig of line scan image sensor.As shown in Figure 6, only within the time shutter of line scan image sensor, lighting control signal CtrSig is just effective, within the time shutter of line scan image sensor, so only lights the associated lamp chain on infrared LED lamp bar, can reduce the power consumption of background light source.LED backlight driver 22 has three kinds of mode of operations, comprises master-slave mode, I2C bus operation mode and manual work pattern.In controller of the present invention, the frequency of operation of LED backlight driver 22 is 2 times of the control clock signal Φ M of touch-screen line scan image sensor, is a fixed frequency, therefore adopts the simplest manual work pattern of circuit.Can drive 160 LED of I0 ~ I9 totally 10 passages when LED backlight driver 22 is operated at full capacity, its design (calculated) load ability decides according to the size of optical multi-point touch screen.LED backlight driver 22 exports some modulating signal VOUT and the I0 ~ I9 of mask lamp bar according to lighting control signal CtrSig.Optical multi-point touch screen is when optical calibrating mode of operation, and calibration switch 23 only carries out switch control rule to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask under this pattern is installed.In addition, when normal mode of operation, the size of optical multi-point touch screen is different, on the infrared LED lamp bar quantity of required light source as a setting and lamp chain, infrared LED quantity is also different, in controller of the present invention, the circuit design of LED backlight driver 22 for operating at full capacity during state, by carrying out break-make control to calibration switch 23, controller of the present invention then can realize the optical multi-point touch screen being applicable to different size.Lighting control module 20 is connected by the mode of cable with the lamp bar in optical multi-point touch screen mask.
Described glass heats control module 30 comprises: humidity data digital dock manager 31, humidity data string turn and processor 32, humidity comparer 33 and adjustable constant-current source driver 34.Controller of the present invention gathers a relative humidity data at set intervals, and obtain accordingly close to can the current relative humidity data at electrically heated glass sheet place outside trapezoidal imaging cartridge, therefore in the present invention, humidity data digital dock manager 31 utilizes the global clock signal GCLK of controller and the control clock signal Φ M of line scan image sensor to generate the serial samples clock signal SCLK_H needed for serial ADC work and the chip selection signal CS_H of relative humidity sensor.Humidity data string turns and processor 32 receives serial relative humidity data SDA_H, and carries out the process that serial data turns parallel data, and the humidity threshold value that parallel relative humidity data PDA_H and internal register 50 are arranged compares in humidity comparer 33.As Fig. 7, Fig. 7 is the structural representation of optical multi-point touch screen mask manhole ladder shape imaging cartridge, the outside of trapezoidal box like structure top margin can be mounted on by electrically heated glass sheet, infrared fileter is installed on can between electrically heated glass sheet and convex cylindrical lens, relative humidity sensor be just mounted on imaging with outside trapezoidal box like structure upper plate close to can electrically heated glass sheet place, trapezoidal imaging cartridge good seal.So, when relative humidity data value is higher than humidity threshold value, only have and the outside surface of electrically heated glass can have the danger of condensation, then humidity comparer 33 sends electric heating control signal PWM, to electrical heating can be carried out by electrically heated glass sheet, until relative humidity data value is lower than humidity threshold value.Adjustable LED constant current source driver 34 receives electric heating control signal PWM, export electrical heating signal Q and REF, electrical heating signal Q and REF signal by the mode of cable with can the bonding jumper at electrically heated glass sheet two ends be connected, thus complete electric heating control, realize the anti-dewing function of controller of the present invention and control method.
Described linear array images data processing unit 40 comprises: linear array images data digital timer manager 41, linear array images serial data turn and processor 42, linear array images data counter 43, linear array images Data Analysis processor 44 and calibration scale storer 45.Linear array images data digital timer manager 41 utilizes the control clock signal Φ M needed for the work of global clock signal GCLK generation line scan image sensor of the controller of the present invention and serial samples clock signal SCLK needed for serial ADC work of line scan image sensor.Linear array images serial data turns and processor 42 receives serial linear array images data SDA, and carries out the process that serial data turns parallel data.Linear array images data counter 43 is according to the exposure time values of host setting and control clock signal Φ M, generate integrate-dump signal ICG, the electronic shutter signal SH needed for line scan image sensor work, generate the chip selection signal CS_ needed for serial ADC work of line scan image sensor simultaneously.Linear array images data counter 43 counts parallel linear array images data PDA in units of frame, often writes a frame all over, then this frame linear array images data PDAs is sent to linear array images Data Analysis processor 44.The optical multi-point touch screen that controller of the present invention controls, when the exposure time values when optical calibrating mode of operation is normal mode of operation 70%.For different exposure time values, the sequential control method of linear array images data counter 43 is identical.Under optical calibrating mode of operation, linear array images Data Analysis processor 44 pairs of linear array images data are carried out dissection process and send to main frame by the network interface of controller of the present invention, main frame runs the calibration scale that associated calibration program processes linear array images data to need when generating this optical multi-point touch screen normal mode of operation, and calibration scale is downloaded to calibration scale storer 45.In the normal mode of operation, linear array images Data Analysis processor 44 is to each frame linear array images Data Analysis process, result is carried out relevant resolving according to the calibration scale in calibration scale storer 45, linear array images data reduction is become blackening position, and converts screen geometry coordinate to.By the USB port of controller of the present invention, screen geometry coordinate data bag is sent to main frame, parse corresponding pixel coordinate accordingly by main frame, thus complete touch operation.
The invention provides a kind of optical multi-point touch screen control method with anti-dewing function, this control method comprises two steps:
Step one is optical calibrating work, and optical calibrating work only uses once to determine its related optical parameter before optical multi-point touch screen is dispatched from the factory, and the optical multi-point touch screen control method under optical calibrating mode of operation comprises the steps,
(1) by the internal register 50 of controller exposure time values is set as the exposure time values under calibration mode, generates the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH and chip selection signal CS_, serial samples clock signal SCLK needed for the work of linear array images data serial analog to digital converter;
(2) controller generates lighting control signal according to control clock signal Φ M, the electronic shutter signal SH of line scan image sensor and integrate-dump signal ICG, and carries out switch control rule to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask is installed;
(3) controller by interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ±, single ended data process is turned to serial differential linear array images data SDA ± carry out differential data and serial data turns Synchronous data dispose;
(4) controller carries out process generation nominal data bag by parallel linear array images data, and be transferred to main frame, main frame runs the calibration scale needed when relevant calibrating procedure processes to generate normal mode of operation to linear array images data, then calibration scale is downloaded in controller, thus complete the optical calibrating work of optical multi-point touch screen;
Step 2 is that optical multi-point touch screen normally works, and the optical multi-point touch screen control method with anti-dewing function under normal mode of operation, comprises the steps:
(1) by the internal register 50 of controller exposure time values is set as the exposure time values under normal mode of operation, generate the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH and chip selection signal CS_, serial samples clock signal SCLK needed for the work of linear array images data serial analog to digital converter, and generate chip selection signal CS_H needed for the work of relative humidity sensor serial analog-digital converter and serial samples clock signal SCLK_H according to the control clock signal Φ M of line scan image sensor;
(2) controller generates lighting control signal according to control clock signal Φ M, the electronic shutter signal SH of line scan image sensor and integrate-dump signal ICG, and switch control rule is carried out to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask is installed, within the time shutter of the line scan image sensor of electronic shutter signal decision, only light the associated lamp chain on infrared LED lamp bar;
(3) controller receives the serial relative humidity data SDA_H of the line scan image sensor serial differential linear array images data SDA after conversion ± and relative humidity sensor by interface circuit, single ended data process is turned to serial differential linear array images data SDA ± carry out differential data and serial data turns Synchronous data dispose, serial data is carried out to the single-ended relative humidity data SDA_H of serial and turns Synchronous data dispose;
(4) humidity threshold value is set by the internal register of controller, and compare with current relative humidity data, when relative humidity data is greater than humidity threshold value, then export effective electrical heating signal PWM and carry out electrical heating to glass can be heated, until relative humidity data is lower than humidity threshold value;
(5) controller carries out image procossing to parallel linear array images data, result is carried out relevant resolving according to calibration scale, thus obtain the screen geometry coordinate of optical multi-point touch screen, and send back to main frame with the form of packet, thus complete the touch control of optical multi-point touch screen.
The advantage of optical multi-point touch screen controller and control method that the present invention has anti-dewing function is quick and while accurately responding the multiple point touching operation of optical touch screen, realizes touch-screen and work under the rugged surroundings of the easy condensation of humidity.
Accompanying drawing explanation
Fig. 1 is controller general structure block diagram of the present invention;
Fig. 2 is sensor interface control module structured flowchart of the present invention;
Fig. 3 is lighting control module structured flowchart of the present invention;
Fig. 4 is glass heats control module structured flowchart of the present invention;
Fig. 5 is linear array images data processing unit structured flowchart of the present invention;
Fig. 6 is lighting control signal sequential chart of the present invention;
Fig. 7 is the structural representation of the trapezoidal imaging cartridge of imaging in optical multi-point touch screen mask.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is controller general structure block diagram of the present invention.As Fig. 1, a kind of optical multi-point touch screen controller with anti-dewing function of the present invention comprises: sensor interface control module 10, lighting control module 20, glass heats control module 30, linear array images data processing unit 40 and internal register 50.
Sensor interface control module 10 is by line scan image sensor, relative humidity sensor and the control signal needed for peripheral circuit work thereof in interface circuit transmission optics formula multi-point touch panel mask, receive differential serial linear array images data and serial relative humidity data, and the conversion process that differential data turns single ended data is carried out to differential serial linear array images data.The associated lamp chain of the infrared LED lamp bar of the light source as a setting that lighting control module 20 pairs of optical multi-point touch screen masks are installed carries out switch control rule.Glass heats control module 30 pairs of relative humidity data carry out serial data and turn Synchronous data dispose, the relatively humidity threshold value of current relative humidity data and internal register 50 setting, judge whether to need to carry out electrical heating to glass can be heated, simultaneously glass heats control module 30 generates relative humidity sensor and the serial samples clock signal needed for serial ADC work thereof and chip selection signal, and is transferred to the relative humidity sensor peripheral circuit in optical multi-point touch screen mask by the interface circuit of sensor interface control module 10.Linear array images data processing unit 40 is when optical calibrating mode of operation, and the optimum configurations according to optical calibrating mode of operation processes linear array images data, sends the nominal data obtained to main frame, and the calibration scale that download host generates; Linear array images data processing unit 40 is when normal mode of operation, optimum configurations according to normal mode of operation processes linear array images data, result is carried out relevant resolving according to calibration scale, thus obtain the screen geometry coordinate of optical multi-point touch screen, and send back to main frame with the form of packet, thus complete the touch control of optical multi-point touch screen.Internal register 50 arranges the exposure time values under humidity threshold value, optical calibrating and normal work two kinds of mode of operations.
Fig. 1 also illustrate that a kind of optical multi-point touch screen control method under optical calibrating mode of operation provided by the invention, and this mode of operation only uses once to determine its related optical parameter before optical multi-point touch screen is dispatched from the factory, and comprises the steps:
(1) by the internal register 50 of controller exposure time values is set as the exposure time values under calibration mode, generates the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH and chip selection signal CS_, serial samples clock signal SCLK needed for the work of linear array images data serial analog to digital converter;
(2) controller generates lighting control signal according to control clock signal Φ M, the electronic shutter signal SH of line scan image sensor and integrate-dump signal ICG, and carries out switch control rule to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask is installed;
(3) controller by interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ±, single ended data process is turned to serial differential linear array images data SDA ± carry out differential data and serial data turns Synchronous data dispose;
(4) controller carries out process generation nominal data bag by parallel linear array images data, and be transferred to main frame, main frame runs the calibration scale needed when relevant calibrating procedure processes to generate normal mode of operation to linear array images data, then calibration scale is downloaded in controller, thus complete the optical calibrating work of optical multi-point touch screen.
Simultaneously Fig. 1 also illustrate that a kind of optical multi-point touch screen control method with anti-dewing function under normal mode of operation provided by the invention, comprises the steps:
(1) by the internal register 50 of controller exposure time values is set as the exposure time values under normal mode of operation, generate the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH and chip selection signal CS_, serial samples clock signal SCLK needed for the work of linear array images data serial analog to digital converter, and generate chip selection signal CS_H needed for the work of relative humidity sensor serial analog-digital converter and serial samples clock signal SCLK_H according to the control clock signal Φ M of line scan image sensor;
(2) controller generates lighting control signal according to control clock signal Φ M, the electronic shutter signal SH of line scan image sensor and integrate-dump signal ICG, and switch control rule is carried out to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask is installed, within the time shutter of the line scan image sensor of electronic shutter signal decision, only light the associated lamp chain on infrared LED lamp bar;
(3) controller receives the serial relative humidity data SDA_H of the line scan image sensor serial differential linear array images data SDA after conversion ± and relative humidity sensor by interface circuit, single ended data process is turned to serial differential linear array images data SDA ± carry out differential data and serial data turns Synchronous data dispose, serial data is carried out to the single-ended relative humidity data SDA_H of serial and turns Synchronous data dispose;
(4) humidity threshold value is set by the internal register of controller, and compare with current relative humidity data, when relative humidity data is greater than humidity threshold value, then export effective electrical heating signal PWM and carry out electrical heating to glass can be heated, until relative humidity data is lower than humidity threshold value;
(5) controller carries out image procossing to parallel linear array images data, result is carried out relevant resolving according to calibration scale, thus obtain the screen geometry coordinate of optical multi-point touch screen, and send back to main frame with the form of packet, thus complete the touch control of optical multi-point touch screen.
Fig. 2 is sensor interface control module structured flowchart of the present invention.As Fig. 2, sensor interface control module 10 is made up of interface connector 11 and spi bus controller 12.Line scan image sensor and operational amplifier, serial ADC and spi bus controller are welded on the drive plate in optical multi-point touch screen mask, relative humidity sensor is mounted on outside trapezoidal imaging cartridge close to can electrically heated glass sheet place, and be connected with drive plate by cable, operational amplifier and the serial ADC of relative humidity sensor are welded on drive plate.Be connected with drive plate by interface connector 11 with touch screen controller of the present invention.Interface connector 11 sends the various signals needed for drive plate work to drive plate, comprises the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH; The chip selection signal CS_ needed for serial ADC work of line scan image sensor; The serial samples clock signal SCLK_H needed for serial ADC work of relative humidity sensor and chip selection signal CS_H; Differential serial sampled clock signal SCLK+, SCLK-in mask needed for the work of spi bus controller.Interface connector 11 receives differential serial linear array images data SDA+, SDA-and the relative humidity data SDA_H of drive plate output.Spi bus controller 12 comprises receiver Receiver and driver Driver.Receiver Receiver receives differential serial linear array images data SDA+, SDA-, and convert thereof into serial linear array images data SDA, driver Driver receives serial samples clock signal SCLK, and converts thereof into differential serial sampled clock signal SCLK+, SCLK-.
Fig. 3 is lighting control module structured flowchart of the present invention.As Fig. 3, lighting control module 20 is made up of lighting signal generator 21, LED backlight driver 22 and calibration switch 23.Lighting signal generator 21 is according to control clock signal Φ M, integrate-dump signal ICG, the electronic shutter signal SH generation lighting control signal CtrSig of line scan image sensor.As shown in Figure 6, only within the time shutter of line scan image sensor, lighting control signal CtrSig is just effective, within the time shutter of line scan image sensor, so only lights the associated lamp chain on infrared LED lamp bar, can reduce the power consumption of background light source.LED backlight driver 22 has three kinds of mode of operations, comprises master-slave mode, I2C bus operation mode and manual work pattern.In controller of the present invention, the frequency of operation of LED backlight driver 22 is 2 times of the control clock signal Φ M of touch-screen line scan image sensor, is a fixed frequency, therefore adopts the simplest manual work pattern of circuit.Can drive 160 LED of I0 ~ I9 totally 10 passages when LED backlight driver 22 is operated at full capacity, its design (calculated) load ability decides according to the size of optical multi-point touch screen.LED backlight driver 22 exports some modulating signal VOUT and the I0 ~ I9 of mask lamp bar according to lighting control signal CtrSig.Optical multi-point touch screen is when optical calibrating mode of operation, and calibration switch 23 only carries out switch control rule to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask under this pattern is installed.In addition, when normal mode of operation, the size of optical multi-point touch screen is different, on the infrared LED lamp bar quantity of required light source as a setting and lamp chain, infrared LED quantity is also different, in controller of the present invention, the circuit design of LED backlight driver 22 for operating at full capacity during state, by carrying out break-make control to calibration switch 23, controller of the present invention then can realize the optical multi-point touch screen being applicable to different size.Lighting control module 20 is connected by the mode of cable with the lamp bar in optical multi-point touch screen mask.
Fig. 4 is glass heats control module structured flowchart of the present invention.As Fig. 4, glass heats control module 30 is turned by humidity data digital dock manager 31, humidity data string and processor 32, humidity comparer 33 and adjustable constant-current source driver 34 form.Controller of the present invention gathers a relative humidity data at set intervals, and obtain accordingly close to can the current relative humidity data at electrically heated glass sheet place outside trapezoidal imaging cartridge, therefore in the present invention, humidity data digital dock manager 31 utilizes the global clock signal GCLK of controller and the control clock signal Φ M of line scan image sensor to generate the serial samples clock signal SCLK_H needed for serial ADC work and the chip selection signal CS_H of relative humidity sensor.Humidity data string turns and processor 32 receives serial relative humidity data SDA_H, and carries out the process that serial data turns parallel data, and the humidity threshold value that parallel relative humidity data PDA_H and internal register 50 are arranged compares in humidity comparer 33.As Fig. 7, Fig. 7 is the structural representation of optical multi-point touch screen mask manhole ladder shape imaging cartridge, the outside of trapezoidal box like structure top margin can be mounted on by electrically heated glass sheet, infrared fileter is installed on can between electrically heated glass sheet and convex cylindrical lens, relative humidity sensor be just mounted on imaging with outside trapezoidal box like structure upper plate close to can electrically heated glass sheet place, trapezoidal imaging cartridge good seal.So, when relative humidity data value is higher than humidity threshold value, only have and the outside surface of electrically heated glass can have the danger of condensation, then humidity comparer 33 sends electric heating control signal PWM, to electrical heating can be carried out by electrically heated glass sheet, until relative humidity data value is lower than humidity threshold value.Adjustable LED constant current source driver 34 receives electric heating control signal PWM, export electrical heating signal Q and REF, electrical heating signal Q and REF signal by the mode of cable with can the bonding jumper at electrically heated glass sheet two ends be connected, thus complete electric heating control, realize the anti-dewing function of controller of the present invention and control method.
Fig. 5 is linear array images data processing unit structured flowchart of the present invention.As Fig. 5, linear array images data processing unit 40 is turned by linear array images data digital timer manager 41, linear array images serial data and processor 42, linear array images data counter 43, linear array images Data Analysis processor 44 and calibration scale storer 45 form.Linear array images data digital timer manager 41 utilizes the control clock signal Φ M needed for the work of global clock signal GCLK generation line scan image sensor of the controller of the present invention and serial samples clock signal SCLK needed for serial ADC work of line scan image sensor.Linear array images serial data turns and processor 42 receives serial linear array images data SDA, and carries out the process that serial data turns parallel data.Linear array images data counter 43 is according to the exposure time values of host setting and control clock signal Φ M, generate integrate-dump signal ICG, the electronic shutter signal SH needed for line scan image sensor work, generate the chip selection signal CS_ needed for serial ADC work of line scan image sensor simultaneously.Linear array images data counter 43 counts parallel linear array images data PDA in units of frame, often writes a frame all over, then this frame linear array images data PDAs is sent to linear array images Data Analysis processor 44.The optical multi-point touch screen that controller of the present invention controls, when the exposure time values when optical calibrating mode of operation is normal mode of operation 70%.For different exposure time values, the sequential control method of linear array images data counter 43 is identical.Under optical calibrating mode of operation, linear array images Data Analysis processor 44 pairs of linear array images data are carried out dissection process and send to main frame by the network interface of controller of the present invention, main frame runs the calibration scale that associated calibration program processes linear array images data to need when generating this optical multi-point touch screen normal mode of operation, and calibration scale is downloaded to calibration scale storer 45.In the normal mode of operation, linear array images Data Analysis processor 44 is to each frame linear array images Data Analysis process, result is carried out relevant resolving according to the calibration scale in calibration scale storer 45, linear array images data reduction is become blackening position, and converts screen geometry coordinate to.By the USB port of controller of the present invention, screen geometry coordinate data bag is sent to main frame, parse corresponding pixel coordinate accordingly by main frame, thus complete touch operation.
Claims (3)
1. there is an optical multi-point touch screen controller for anti-dewing function, it is characterized in that this controller comprises sensor interface control module (10), lighting control module (20), glass heats control module (30), linear array images data processing unit (40), internal register (50);
(1) the sensor interface control module (10) described in is by the control signal in interface circuit transmission optics formula multi-point touch panel mask needed for line scan image sensor, relative humidity sensor and peripheral circuit work thereof, receive differential serial linear array images data and serial relative humidity data, and the conversion process that differential serial data turns serial data is carried out to differential serial linear array images data;
(2) the associated lamp chain of the lighting control module (20) described in the infrared LED lamp bar of the light source as a setting that optical multi-point touch screen mask is installed carries out switch control rule, can reduce the power consumption of background light source;
(3) the glass heats control module (30) described in carries out serial data to relative humidity data and turns Synchronous data dispose, to carrying out the need of electrical heating judgement and electric heating control by electrically heated glass;
Described glass heats control module (30) comprises humidity data digital dock manager (31), humidity data string turns and processor (32), humidity comparer (33) and adjustable constant-current source driver (34); Humidity data digital dock manager (31) generates serial samples clock signal SCLK_H needed for the serial ADC work of relative humidity sensor and chip selection signal CS_H for utilizing the control clock signal Φ M of the global clock signal GCLK of controller and line scan image sensor; Humidity data string turn and processor (32) for receiving serial relative humidity data SDA_H, and carrying out the process that serial data turns parallel data, the humidity threshold value that parallel relative humidity data PDA_H and internal register (50) are arranged compares in humidity comparer (33); Humidity comparer (33) for sending electric heating control signal PWM, to electrical heating can be carried out by electrically heated glass sheet, until relative humidity data value is lower than humidity threshold value; Adjustable LED constant current source driver (34) is for receiving electric heating control signal PWM, export electrical heating signal Q and REF signal, electrical heating signal Q and REF signal by the mode of cable with can the bonding jumper at electrically heated glass sheet two ends be connected, thus complete electric heating control;
(4) the linear array images data processing unit (40) described in sends linear array images data packet to main frame under calibration mode, and the calibration scale that storage host returns; In the normal mode of operation according to calibration scale, dissection process is carried out to linear array images data, generate the screen geometry coordinate of multi-point touch panel, send back to main frame with the form of packet;
(5) internal register (50) described in arranges the exposure time values under humidity threshold value, optical calibrating and normal work two kinds of mode of operations.
2. there is an optical multi-point touch screen control method for anti-dewing function, it is characterized in that comprising the steps:
Step one is optical calibrating work, and optical calibrating work only uses once to determine its related optical parameter before optical multi-point touch screen is dispatched from the factory, and the optical multi-point touch screen control method under optical calibrating mode of operation, comprises the steps:
(1) by the internal register (50) of controller exposure time values is set as the exposure time values under calibration mode, generates the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH and chip selection signal CS_, serial samples clock signal SCLK needed for the work of linear array images data serial analog to digital converter;
(2) controller generates lighting control signal according to control clock signal Φ M, the electronic shutter signal SH of line scan image sensor and integrate-dump signal ICG, and carries out switch control rule to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask is installed;
(3) controller by interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ±, single ended data process is turned to serial differential linear array images data SDA ± carry out differential data and serial data turns Synchronous data dispose;
(4) controller carries out process generation nominal data bag by parallel linear array images data, and be transferred to main frame, main frame runs the calibration scale needed when relevant calibrating procedure processes to generate normal mode of operation to linear array images data, then calibration scale is downloaded in controller, thus complete the optical calibrating work of optical multi-point touch screen;
Step 2 is that optical multi-point touch screen normally works, and the optical multi-point touch screen control method with anti-dewing function under normal mode of operation, comprises the steps:
(1) by the internal register (50) of controller exposure time values is set as the exposure time values under normal mode of operation, generate the control clock signal Φ M needed for line scan image sensor work, integrate-dump signal ICG, electronic shutter signal SH and chip selection signal CS_, serial samples clock signal SCLK needed for the work of linear array images data serial analog to digital converter, and generate chip selection signal CS_H needed for the work of relative humidity sensor serial analog-digital converter and serial samples clock signal SCLK_H according to the control clock signal Φ M of line scan image sensor;
(2) controller generates lighting control signal according to control clock signal Φ M, the electronic shutter signal SH of line scan image sensor and integrate-dump signal ICG, and switch control rule is carried out to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask is installed, within the time shutter of the line scan image sensor of electronic shutter signal decision, only light the associated lamp chain on infrared LED lamp bar;
(3) controller receives the serial relative humidity data SDA_H of the line scan image sensor serial differential linear array images data SDA after conversion ± and relative humidity sensor by interface circuit, single ended data process is turned to serial differential linear array images data SDA ± carry out differential data and serial data turns Synchronous data dispose, serial data is carried out to the single-ended relative humidity data SDA_H of serial and turns Synchronous data dispose;
(4) humidity threshold value is set by the internal register of controller, and compare with current relative humidity data, when relative humidity data is greater than humidity threshold value, then export effective electrical heating signal PWM and carry out electrical heating to glass can be heated, until relative humidity data is lower than humidity threshold value;
(5) controller carries out image procossing to parallel linear array images data, result is carried out relevant resolving according to calibration scale, thus obtain the screen geometry coordinate of optical multi-point touch screen, and send back to main frame with the form of packet, thus complete the touch control of optical multi-point touch screen.
3. a kind of optical multi-point touch screen controller with anti-dewing function according to claim 1, it is characterized in that: described lighting control module (20) is made up of lighting signal generator (21), LED backlight driver (22) and calibration switch (23)
(1) lighting signal generator (21) is according to control clock signal Φ M, integrate-dump signal ICG, the electronic shutter signal SH generation lighting control signal CtrSig of line scan image sensor;
(2) LED backlight driver (22) exports some modulating signal VOUT and the I0 ~ I9 of mask lamp bar according to lighting control signal CtrSig;
(3) calibration switch (23) only carries out switch control rule to the associated lamp chain of the infrared LED lamp bar of the light source as a setting that optical touch screen mask under current operation mode is installed.
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| US11093060B2 (en) * | 2019-05-16 | 2021-08-17 | Cirrus Logic, Inc. | Interference detection and mitigation in inductive sensor applications and dynamic adaptation based on real-time noise detection |
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| CN102541364A (en) * | 2010-12-16 | 2012-07-04 | 乐金显示有限公司 | Lowering the output of optical emitters during non touch |
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| CN102289326A (en) * | 2011-07-07 | 2011-12-21 | 中国船舶重工集团公司第七○九研究所 | Optical multi-point touch screen device and method applicable to vibration and damp environment |
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