CN202600668U - Device for automatically eliminating temperature difference drift of contact coordinates of capacitive touch screen - Google Patents
Device for automatically eliminating temperature difference drift of contact coordinates of capacitive touch screen Download PDFInfo
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- CN202600668U CN202600668U CN 201220206570 CN201220206570U CN202600668U CN 202600668 U CN202600668 U CN 202600668U CN 201220206570 CN201220206570 CN 201220206570 CN 201220206570 U CN201220206570 U CN 201220206570U CN 202600668 U CN202600668 U CN 202600668U
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- capacitive touch
- temperature difference
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Abstract
The utility model discloses a device for automatically eliminating the temperature difference drift of contact coordinates of a capacitive touch screen. The device comprises a micro control unit (MCU), a touch detection device, the capacitive touch screen and an interface circuit, wherein the input of the touch detection device is connected with the capacitive touch screen, and the output of the touch detection device is connected with the input of the MCU; the interface circuit is positioned between the MCU and a central processing unit (CPU) of a main unit; and the MCU is connected with a temperature detection device and a Flash memory. The MCU of the capacitive touch screen automatically compensates and corrects coordinate points according to a set formula under the control of software on the basis of the change of the detected temperature and initial temperature, and automatic temperature compensation can be realized without manual intervention.
Description
Technical field
The utility model relates to a kind of means for correcting of capacitive touch screen temperature difference drift of contact coordinate, especially a kind of device that can carry out the compensation of temperature difference coordinate automatically, the device of a kind of specifically automatic elimination capacitive touch screen contact coordinate temperature drift.
Background technology
As everyone knows, the input system of capacitive touch screen is made up of touch-screen, touch screen controller and corresponding control device thereof and corresponding program.Wherein, touch screen controller is from the contact senses touch information of touch-screen, and converts it to contact coordinate, gives host CPU again; It can receive simultaneously the order that host CPU sends and carry out.The ultimate principle of capacitive touch screen is that the position that is touched (with coordinate form) detected by touch screen controller, and delivers to host CPU through interface, thereby confirms the information of input when being installed in the touch-screen of display front end with finger or the touch of other object.
Because the unit for electrical property parameters of touch detecting apparatus and touch-screen etc. can change with temperature variation, thereby the temperature variant phenomenon of contact coordinate can take place.In addition, the characteristic of some elements of touch detecting apparatus also can change with temperature.
Just there are these problems in traditional capacitive touch screen.This is unacceptable for the user, possibly cause false triggering.The utility model can automatically be accomplished the correction work to these skews in internal system, not only accurately and reliably but also succinctly convenient.
Existing capacitive touch screen system when temperature variation is big, under contact position and the excessive situation of display position deviation, the employing manual work is method of correcting at any time.Be after the temperature variation, under new temperature environment, rerun correction program, reset the parameter in the storer, contact position and real position are consistent.But these are operated concerning the user, inconvenience very.
In a word; Existing capacitive touch screen in use except environment temperature is had relatively high expectations, also need regularly carry out temperature correction, and temperature correction must just can be carried out via the professional who received training; And program is very complicated, so user's very inconvenience in the operation and maintenance process.It is imperative to develop a kind of capacitive touch screen system that can carry out temperature compensation automatically.
The utility model content
The purpose of the utility model is the problem of proofreading and correct inconvenience to existing capacitive touch screen temperature difference drift of contact coordinate, and a kind of device of automatic elimination capacitive touch screen temperature difference drift of contact coordinate is provided.
The utility model is to adopt following technical scheme to realize: a kind of device of automatic elimination capacitive touch screen temperature difference drift of contact coordinate; Comprise MCU, touch detecting apparatus, capacitive touch screen, interface circuit; The input of touch screen detection device links to each other with touch-screen, and the output of touch detecting apparatus connects the input of MCU, and interface circuit is between MCU and host CPU; It is characterized in that said MCU also is connected with temperature-detecting device and Flash flash memory.
Wherein, described temperature-detecting device is a digital temperature sensor, and its output links to each other with the I/O pin of MCU.
Wherein, described temperature-detecting device is analog temperature sensor, and its output connects the input of A/D change-over circuit, and the output of A/D change-over circuit links to each other with the I/O pin of MCU.
Wherein, described temperature-detecting device is analog temperature sensor, and its output connects the input of the A/D change-over circuit in the MCU.
Beneficial effect: the utility model has solved the problem of having a headache most in user's use; Greatly facilitate the user, necessary initialization procedure can move when dispatching from the factory, and the user connects with the mains and data line can use; No matter and how temperature to change, all can guarantee its accuracy; Easy to implement the method reliable, software and hardware is easy to realize, is the revolution property change to touch screen performance, can improve its performance class greatly, and exaggerative its range of application has solved the use problem of the temperature difference than touch-screen in the overall situation.
Description of drawings
Fig. 1 is the touch-screen system structured flowchart of the automatic elimination capacitive touch screen contact coordinate temperature drift of the utility model;
Fig. 2 is the circuit theory diagrams of the embodiment of the utility model;
Fig. 3 is the software flow pattern of the embodiment of the utility model;
Fig. 4 is the wiring schematic diagram of the digital temperature sensor of the utility model;
Fig. 5 is the analog temperature sensor of the utility model and the wiring schematic diagram of independent A/D converter;
Fig. 6 is the analog temperature sensor of the utility model and the wiring schematic diagram of the built-in A/D sensor of MCU;
Fig. 7 be among the embodiment of the utility model certain fixed point coordinate year temperature variation sample;
Fig. 8 be among the embodiment of the utility model certain fixed point coordinate year temperature variation curve.
Reference numeral:
1MCU 2 touch detecting apparatus 3 capacitive touch screens 4 interface circuit 5Flash flash memories 6 temperature-detecting devices
Embodiment
By the technology contents, the structural attitude that specify the utility model, realized purpose and effect, know clearly below in conjunction with embodiment and conjunction with figs. and give explanation.
See also Fig. 1-Fig. 6; A kind of device of automatic elimination capacitive touch screen temperature difference drift of contact coordinate; Comprise MCU1 (be multipoint controller, realize), touch detecting apparatus 2, capacitive touch screen 3, interface circuit 4, Flash flash memory 5 and temperature-detecting device 6 as adopting prior art, as shown in Figure 1; The input of touch detecting apparatus 2 links to each other with capacitive touch screen 3; The output of touch detecting apparatus 2 connects the input of MCU1, and interface circuit 4 is between MCU1 and host CPU, and MCU1 also is connected with temperature-detecting device 6 can adopt Fig. 4 or temperature sensor shown in Figure 5 with Flash flash memory 5. temperature-detecting devices 6.The circuit theory diagrams of present embodiment are as shown in Figure 2.
MCU1 can adopt the AT89S52 single-chip microcomputer of AMTEL company during practical implementation; Touch detecting apparatus 2 can adopt the special chip ADS7845 of TI company; Flash flash memory 5 adopts the X5045 of XICOR company, and temperature-detecting device 6 adopts DS1620, and interface adopts RS-232 to walk interface.
After above-mentioned hardware system connects, connect and to begin to have carried out the operation of touch-screen.Shown in Figure 3 is the process flow diagram of temperature revision program.In conjunction with this routine hardware circuit, adopted the method that the temperature difference is carried out segmentation to carry out data correction, can simplify the complexity of temperature revision program, improve the response time of system.It is more reasonable that this example is with 10 degrees centigrade that gradient is revised, and neither can influence the response time of system, and greatly limit improves the accuracy of contact coordinate again.
Each functions of components and the principle of work of the utility model are following:
The purpose of the utility model is to improve the said temperature drift phenomenon, improves the reliability of capacitive touch screen work.Its critical piece comprises temperature-detecting device 6; MCU1; Be used to store the Flash flash memory 5 of correlation parameter; Touch detecting apparatus 2 passes through measures ambient temperature with interface circuit 4. native systems, in the microprocessor (MCU) of control system, adopts the method for software correction simultaneously, has solved the temperature drift problem that the conventional condenser touch-screen exists.
MCU is a CPU in the utility model, controls various modes of operation and process.Little process chip kind that can supply to select for use is a lot, for example ATMEL51 single-chip microcomputer, various brands CPU the microprocessor realized with logical circuits such as FPGA.
Temperature-detecting device, adoptable is digital temperature sensor, is used for the acquisition environment temperature.Temperature sensor also can adopt analog temperature sensor, like thermistor, thermopair etc., obtains digital temperature value through analog-digital commutator.
Touch detecting apparatus can adopt the Universal Die analog-to-digital conversion apparatus, also can adopt the die for special purpose analog-to-digital conversion apparatus, and like ADS7845, it handles the information of voltage on the capacitive touch screen, thereby helps central control unit to confirm the position of contact.
Interface circuit be responsible for to transmit the data between CPU and the host CPU, and it is criminal can to adopt RS-232 serial ports, parallel port or USB interface etc.
The utility model course of work is following:
After system switches on first; Must the operation correction program could operate as normal, this all is identical to all touch screen control systems, different is the utility model; In trimming process; System's meeting detected temperatures parameter detects the temperature value of this moment by temperature-detecting device, and stores in the Flash flash memory.
After the correction, system just can operate as normal.In an embodiment, system's detection at any time environment temperature, and detect whether touch generation.When touching generation; Single-chip microcomputer is compared the temperature value of Current Temperatures and timing; If the temperature difference has surpassed the gradient of regulation; Then move revision program, revise because the phenomenon of the contact coordinate drift that temperature variation causes guarantees that contact coordinate is not changing under any temperature or in very little scope, changing.So just can avoid the inconsistent situation of contact position and real position to take place.
In an embodiment, taked with 10 degrees centigrade be the way of a gradient, just so also can take with 5 degrees centigrade as required is a gradient, perhaps other gradients.
Suppose that touch-screen is at 20 degrees centigrade of (t
0) time carried out once proofreading and correct, temperature-detecting device can detect this temperature information of t0, has this information among the Flash through the central control unit microprocessor then; After this in use; If temperature rises to 70 degrees centigrade (t1), temperature-detecting device can in time detect this temperature information of t1, compares the t0 among t1 and the Flash through central control unit; Because temperature variation is arranged, so can the running temperature revision program.Shown in Figure 7 be on the capacitive touch screen a certain point of fixity coordinate figure year temperature variation situation.Be prone to see that along with the rising of temperature, the coordinate figure of this fixed point can great changes will take place by figure.According to this form, can draw out the curve (as shown in Figure 8) of coordinate figure with the temperature change.According to curve, set up corresponding equation, no matter how temperature changes, the correct coordinates value of (t0) in the time of can both reaching 20 degrees centigrade through correction in this embodiment, is temperature-coordinate figure curve approximation a straight line, sets up equation X '=Ax+b.Wherein, X ' is for revising later coordinate figure, and X is the measured value that touch detecting apparatus is given MCU, and a, b are coefficient, and the common and temperature pipe of its value need record through test.The scope of a between 0.6 to 1.5, also can be sought a and △ t usually
1(△ t=t
1-t
0) relational expression, as selecting a=1+0.003* △ t/10, the scope of b is usually between 0 to 100; Although 50 ° temperature deviation is arranged, through the operation of temperature revision program, contact position and the display position on the display on the touch-screen still do not have deviation.This is very suitable for the high occasion of accuracy requirement.If adopt conventional touch screen control system, will be when temperature variation be big, contact position and display position deviation are very big, even reach one to two centimetre gap.
In native system, adopted the reference temperature of Flash record timing, so after system's power down, this temperature information can also continue to preserve, wait after start next time, even variation of ambient temperature can not have influence on the reliability of work yet.So just not be used in each start and carried out correction program later on, saved many troubles.
The sensitivity of temperature-detecting device all can freely be selected with the temperature range that can detect; Such as adopting some digital temperature sensor; His temperature detection error is in 2 degrees centigrade; Detectable temperature range is spent above freezing 125 from subzero 55 and is spent, and this has just enough used for general environment.Can certainly select other forms of temperature sensor, such as simulated temperature measurement devices such as employing thermistors, obtain temperature information through analog to digital conversion, the precision of just doing like this maybe be weaker a little.In the not high occasion of ask for something, do like this and help to reduce cost.
As for the temperature revision program, multiple implementation method can be arranged.In the embodiment of the utility model, the response speed of touch-screen is mainly stressed in the application of system, so the temperature revision program that adopts is comparatively simple.Find that through experiment temperature variation is in 10 degrees centigrade the time, contact coordinate and real grid deviation are little, and for the resolution of 1024*1024, maximum deviation is 3 pixels.Such deviation human eye is not easy to differentiate.So the temperature revision program of system is carried out stepping to temperature deviation, be that a gradient is revised with 10 degrees centigrade of temperature difference.The temperature difference is not revised in 10 degrees centigrade.
The algorithm of temperature revision program also will combine consideration with the CPU microprocessor, if the more common single-chip microcomputer of processor selection, the temperature correction algorithm just can not be too complicated so, otherwise can have a strong impact on the response speed of system.If MCU selects DSP at a high speed etc., then can suitably increase the complexity of temperature correction algorithm.In the present embodiment, MCU adopts the AT89S52 of atmel corp, and the temperature revision program adopts the algorithm with 10 degrees centigrade of steppings, and through testing and the actual checking of using, almost the touch-responsive speed to touch-screen system does not influence.
Adopted above-mentioned disposal route; Can be the deviation eliminating of all in the touch-screen system because contact position that temperature variation causes with display position; And all processes are all accomplished on touch screen controller automatically, need not increase user's operation bidirectional, and are convenient and swift.
The above is merely the embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (4)
1. device of automatically eliminating the capacitive touch screen temperature difference drift of contact coordinate; Comprise MCU, touch detecting apparatus, capacitive touch screen, interface circuit; The input of touch screen detection device links to each other with touch-screen, and the output of touch detecting apparatus connects the input of MCU, and interface circuit is between MCU and host CPU; It is characterized in that said MCU also is connected with temperature-detecting device and Flash flash memory.
2. the device of the described automatic elimination capacitive touch screen temperature difference drift of contact coordinate of general layout claim 1 is characterized in that, described temperature-detecting device is a digital temperature sensor, and its output links to each other with the I/O pin of MCU.
3. the device of automatic elimination capacitive touch screen temperature difference drift of contact coordinate according to claim 1; It is characterized in that; Described temperature-detecting device is analog temperature sensor; Its output connects the input of A/D change-over circuit, and the output of A/D change-over circuit links to each other with the I/O pin of MCU.
4. the device of automatic elimination capacitive touch screen temperature difference drift of contact coordinate according to claim 1 is characterized in that, described temperature-detecting device is analog temperature sensor, and its output connects the input of the A/D change-over circuit in the MCU.
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| CN 201220206570 CN202600668U (en) | 2012-05-09 | 2012-05-09 | Device for automatically eliminating temperature difference drift of contact coordinates of capacitive touch screen |
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| CN 201220206570 CN202600668U (en) | 2012-05-09 | 2012-05-09 | Device for automatically eliminating temperature difference drift of contact coordinates of capacitive touch screen |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103054564A (en) * | 2013-01-29 | 2013-04-24 | 东北大学 | FPGA (Field Programmable Gate Array)-based pulse wave signal generator and method |
| CN104951087A (en) * | 2014-03-31 | 2015-09-30 | 索尼公司 | Information processing device, input device, information processing method, and program |
| CN106059555A (en) * | 2015-04-09 | 2016-10-26 | 三星电子株式会社 | Method and apparatus for operating sensor of electronic device |
| CN106526332A (en) * | 2016-10-25 | 2017-03-22 | 华南师范大学 | System and method for detecting capacitor of scanning line of capacitive touch screen |
| CN108132734A (en) * | 2018-01-30 | 2018-06-08 | 业成科技（成都）有限公司 | Touch panel and touch device |
-
2012
- 2012-05-09 CN CN 201220206570 patent/CN202600668U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103054564A (en) * | 2013-01-29 | 2013-04-24 | 东北大学 | FPGA (Field Programmable Gate Array)-based pulse wave signal generator and method |
| CN104951087A (en) * | 2014-03-31 | 2015-09-30 | 索尼公司 | Information processing device, input device, information processing method, and program |
| CN104951087B (en) * | 2014-03-31 | 2020-07-10 | 索尼公司 | Information processing apparatus, input apparatus, information processing method, and program |
| CN106059555A (en) * | 2015-04-09 | 2016-10-26 | 三星电子株式会社 | Method and apparatus for operating sensor of electronic device |
| CN106059555B (en) * | 2015-04-09 | 2021-10-01 | 三星电子株式会社 | Electronic device and method for operating electronic device |
| CN106526332A (en) * | 2016-10-25 | 2017-03-22 | 华南师范大学 | System and method for detecting capacitor of scanning line of capacitive touch screen |
| CN108132734A (en) * | 2018-01-30 | 2018-06-08 | 业成科技（成都）有限公司 | Touch panel and touch device |
| TWI660300B (en) * | 2018-01-30 | 2019-05-21 | 大陸商業成科技（成都）有限公司 | Touch panel and touch device |
| CN108132734B (en) * | 2018-01-30 | 2021-05-04 | 业成科技（成都）有限公司 | Touch panel and touch device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 518110 Guangdong province Shenzhen city Longhua District No. two Fu Guanlan Street Community Ao Bei Dafu Industrial Zone Peng Longpan high-tech park B building 4 floor Patentee after: CINOTOP ELECTRONICS CO., LTD. Address before: 518110 Guangdong city of Shenzhen province Baoan District Guanlan Street rich industrial zone two road Peng Longpan high-tech park B building 4 floor Patentee before: Shenzhen Zhi Ling Wei Ye Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |