CN206038809U - A drive signal generating device for capacitive touch panel test - Google Patents
A drive signal generating device for capacitive touch panel test Download PDFInfo
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- CN206038809U CN206038809U CN201621074595.6U CN201621074595U CN206038809U CN 206038809 U CN206038809 U CN 206038809U CN 201621074595 U CN201621074595 U CN 201621074595U CN 206038809 U CN206038809 U CN 206038809U
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- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 239000011159 matrix material Substances 0.000 claims abstract description 27
- 238000005086 pumping Methods 0.000 claims description 38
- 238000003860 storage Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 239000004615 ingredient Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
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Abstract
The utility model discloses a drive signal generating device for capacitive touch panel test. The device includes the control unit, DDS unit, FPGA unit, matrix keyboard, LCD display module, signal waveform storage module and USB interface module, wherein, the FPGA unit is connected with LCD display module, matrix keyboard, DDS unit, the control unit, USB interface module respectively, the control unit is connected with USB interface module, DDS unit, FPGA unit, signal waveform storage module respectively. The utility model discloses can provide polytype drive signal for the capacitive touch panel test system, for example square wave, triangular wave, sine wave etc. Alleviate and carry out the complexity of testing to capacitive touch panel to improve production efficiency.
Description
Technical field
This utility model belongs to testing touch screen field, more particularly to a kind of pumping signal for capacitance touch screen test
Generating meanss.
Background technology
Touch screen is widely used to each neck of daily life as a kind of input equipment of man-machine interaction
Domain, for example, mobile phone, digital camera, ticketing terminal system, and in Industry Control, educational training, information inquiry, public entertainment etc.
Field has broad application prospects.Touch screen is attached to display surface, uses cooperatively with display.It is by finger
Touch and produce analog electronic signal, then be converted into the coordinate signal of touch point through analog digital conversion, so as to by operator's
Will conveys to computer or message processing device.It is input into by using touch screen, the loaded down with trivial details of keyboard can be abandoned completely
Input mode, man-machine interaction only need finger gently one to touch, and make operating process become more simple and directly perceived.
Touch screen can be divided into following several classes：Resistive touch screen, capacitive touch screen, infrared-type touch screen, table
Face acoustic wave touching screen etc., wherein capacitive touch screen are widely applied in mobile phone and mobile electronic device in recent years, it
Type be broadly divided into surface-type capacitance touch screen and projection-type capacitive touch screen.The basic structure of capacitance touch screen is：With one
Individual single-glass is substrate, makes the conductive film of layer of transparent on the surfaces externally and internally of substrate, and in the conductive thin of outer surface
Four electrodes are set on four angles of film.When finger touches the upper surface of touch screen, on now capacitance touch screen leads to
High-frequency signal, therefore human body and touch screen work surface are formed a coupled capacitor device, finger can suck one in touch point
Partial charge is to form a small electric current, and the electric current is exported from four electrodes of touch screen respectively, by calculating from this
The ratio of four electrode output currents, it is possible to obtain the coordinate position of touch point.
In the production process of capacitive touch screen, including many production processes, every kind of operation all may introduce deviation or
Defect is produced, so as to the quality on it produces impact.In order to ensure touching the quality of screen products, it is necessary in process of production many
Individual operation is tested to it.
In the test process of touch screen, pumping signal is particularly important to the result for detecting.Presently used touch screen inspection
In survey method, there are problems that the type of pumping signal is single, the scope of the amplitude of signal and frequency it is less.
Utility model content
The purpose of this utility model is the shortcoming and deficiency for overcoming prior art, there is provided a kind of to survey for capacitance touch screen
The pumping signal generating meanss of examination.
The purpose of this utility model is achieved through the following technical solutions：A kind of pumping signal for capacitance touch screen test
Generating meanss, including control unit, DDS units, FPGA unit, matrix keyboard module, LCD display module, signal waveform storage
Module and usb interface module；Wherein, FPGA unit is single with LCD display module, matrix keyboard module, DDS units, control respectively
Unit, usb interface module connection；Control unit stores mould with usb interface module, DDS units, FPGA unit, signal waveform respectively
Block connects.
Described control unit is used for providing control signal to DDS (direct digital synthesis technique) unit, with to produced
The parameter of pumping signal, signal generating process etc. be controlled, such as the frequency, phase place, waveform kind to excitation signal waveforms
Class and modulation system etc. are controlled；The information of pumping signal is saved in signal waveform memory module, and passes through USB interface
Computer in module and whole testing system for capacitive touch screen carries out the transmission and communication of data.Control unit and matrix keyboard
Module and LCD display module connection, the parameter value of the pumping signal to being input into by matrix keyboard module processes, and by one
The type of for example produced pumping signal of a little results and corresponding parameter value etc. are shown in LCD display module.It is described
Control unit be preferably STC90 single-chip microcomputers.
Described DDS units are used for producing excitation signal waveforms, and the unit uses program-controlled clock signal as address
The counting clock of enumerator, using the output of address counter as wave memorizer scan address, wave memorizer output phase
The digital amplitude sequence of address is answered, then afterwards this analogue step waveform is used into analogue step waveform through digital-to-analogue conversion
The smothing filtering of low pass filter and the excitation signal waveforms required for obtaining.Described DDS units are preferably ADI companies and are given birth to
The AD9954 chips of product.
Described FPGA unit provides a kind of reference clock signal, and the clock signal is used as each group of whole device
Into the synchronizing clock signals of part, this clock signal is producing by the crystal oscillator of a high stability.FPGA unit
The various different voltage that multiple ingredients of device need is also provided for, i.e., realizes the conversion of level as needed.It is described
FPGA unit be preferably altera corp Cyclone Series FPGA chip EP1C3T144C8.
Described matrix keyboard module provides the input mode to some information, and such as input needs the pumping signal for producing
Type, frequency, phase place etc..The structure of described matrix keyboard module is as follows：For 4 × 4 determinant matrix keyboard, 4 rows
Input line and 4 column output lines are connected with 8 input ports of FPGA unit respectively.Described matrix keyboard module contains 16
Key, respectively numeral keys 0 to 9 and function key " waveform ", " frequency ", " phase place ", " unit ", " removing " and " it is determined that ".
Described LCD display module is to provide the interface of man-machine interaction, realizes to waveform parameter and system running state
The display of the information such as prompting.Described LCD display module is preferably LCD12864 LCDs.
Described signal waveform memory module is to realize the storage of the Wave data to pumping signal.It is of the present utility model to swash
Signal generation apparatus are encouraged to some conventional pumping signals and its parameter (type, frequency, phase place etc.) by matrix keyboard mould
After block input, can be stored in the signal waveform memory module, directly invoke when using next time.Described signal
Waveform memory module is preferably SDRAM memory；The more preferably SDRAM memory of 64M.
The Wave data of a cycle and waveform parameter are sent to and are connected with whole device by described usb interface module
External computer system or testing system for capacitive touch screen in.Meanwhile, external computer system or capacitance touch screen test are
The information such as the type and parameter of the pumping signal that system also can be produced required for being sent to whole device by the usb interface module.
Described usb interface module is preferably CY7C68013A chips.
This utility model is had the following advantages relative to prior art and effect：This utility model is according to the signal specified
The isoparametric value of frequency, phase place, type of waveform, produces the pumping signal for capacitance touch screen test, such as square wave, triangle
Ripple, sine wave etc., then the Wave data of a cycle and waveform parameter are sent to the capacitance touch being connected with device
In screen test system or outer computer；Meanwhile, outside testing system for capacitive touch screen or computer can also be connect by USB
The information such as the type and parameter of the pumping signal that mouth mold block is produced required for sending to the device.This utility model can be electric capacity
Testing touch screen system provides polytype pumping signal, mitigates the complexity tested to capacitance touch screen, so as to carry
High efficiency.
Description of the drawings
Fig. 1 is system structure diagram of the present utility model.
Fig. 2 is the structural representation of matrix keyboard module of the present utility model.
Specific embodiment
This utility model is described in further detail with reference to embodiment and accompanying drawing, but enforcement of the present utility model
Mode not limited to this.
Embodiment 1
A kind of pumping signal generating meanss for capacitance touch screen test, as shown in figure 1, mono- including control unit, DDS
Unit, FPGA unit, matrix keyboard module, LCD display module, signal waveform memory module and usb interface module；Wherein, FPGA
Unit is connected with LCD display module, matrix keyboard module, DDS units, control unit, usb interface module respectively；Control unit
It is connected with usb interface module, DDS units, FPGA unit, signal waveform memory module respectively.
Control unit is that operating process and data transmission of the modules to whole device etc. is controlled.This practicality is new
Type is implemented as follows to control unit：The control unit of whole device is used as using STC90 single-chip microcomputers, it has 8K words
The flash storage of section, operating frequency reach as high as 80MHz.
DDS units are used for producing excitation signal waveforms.To DDS units, this utility model is produced using ADI companies
AD9954 chips are realizing.AD9954 is by the DDS cores with 400MSPS, 14 digit weighted-voltage D/A converters, comparator, a reference
Six part such as clock input circuit, clock and control circuit, user interface constitutes.With phase/amplitude is programmable, 32 bit frequencies
Control word, built-in very high speed analog comparator, the multifrequency natures such as 32 RAM, serial i/O control have been internally integrated it.Due to
The D/A converter and comparator of the built-in high speeds of AD9954, therefore can produce the analog sine wave signal of MHz up to a hundred；Utilize
The static RAM that AD9954 is included can realize the High Speed Modulation to it, and support various frequency sweep modes；Using the serial of AD9954
I/O control words, it is possible to achieve the adjustment and control to signal waveform frequency.
FPGA unit provides synchronous clock signal for each ingredient of whole device, and realizes the conversion of level.
To FPGA unit, this utility model uses altera corp Cyclone Series FPGA chip EP1C3T144C8, realizes to DDS cores
Data transmission and the control of piece AD9954.The chip supports various external memory interfaces and data input and output protocol, and
And containing abundant memorizer and embedded multiplier, and the chip uses 1.5V core voltage, can reduce whole circuit
Power consumption.Chip EP1C3T144C8 provides clock signal for DDS units, and for peripheral components provide data bus interface and
Control signal.Coordination to the work clock of multiple modules of whole device, this utility model are by using a high stable
The crystal oscillator of degree producing a kind of reference clock signal, then by the frequency multiplication or frequency dividing of FPGA unit again to modules
Work clock is provided.Download configuration circuit to FPGA unit, as Cyclone family devices are storing using sram cell
Configuration information, and SRAM is a kind of memorizer of volatibility, its data and information of its storage after each power down will be lost
Lose, for this purpose, all must download configuration data during electricity on every time to Cyclone family devices.Cyclone family devices are mainly propped up
Hold the configuration modes such as JTAG configurations, active arrangement and passive configuration.This utility model is configured using JTAG and active configuration mode,
JTAG configurations are mainly used in debugging, after debugging is completed, configuration file are write the circuit of active arrangement, by masters
Formula can thus be realized being not used in carrying out every time all manually coming during the generation of excitation signal waveforms configuring FPGA unit
Download configuration information.
Matrix keyboard module can provide the input to needing the information such as the type of pumping signal for occurring, frequency, phase place.This
Utility model to its realization using 4 × 4 determinant matrix keyboard, its 4 row input lines and 4 column output lines respectively with
Eight input ports of FPGA unit are connected.The function definition of each button is as shown in Figure 2.Matrix keyboard module provides 16
Key, wherein has numeral keys 0 to 9, function key " waveform ", " frequency ", " phase place ", " unit ", " removing " and " it is determined that ".
LCD display module provides man-machine interaction, realizes the display to information such as waveform parameter and system running states.This reality
With the new Liquid Crystal Module for adopting 128 × 64 dot matrix i.e. LCD12864 LCDs.This LCDs support it is parallel and
Serial operation, is built-in with ST7920 liquid crystal driving controllers, while built-in Chinese word library, can easily show sharp
Encourage the parameter value of signal waveform.
Signal waveform memory module is to provide the storage of the Wave data to pumping signal.This utility model is adopted to be had
The SDRAM memory of 64MB, this is the parallel connection by two panels HY57V561620 storage chip, 32 for building SDRAM storages
Device system.
Usb interface module is to carry out data as whole device with external computer system or testing system for capacitive touch screen
The path of communication.This utility model is being designed, to realize by USB to usb interface module using CY7C68013A chips
Interface module enters row data communication.The chip supports USB 2.0, reads and writes (i.e. FIFO read-writes) with single byte read-write and multibyte
Two ways.Single byte read-write mainly completes the communication of small data quantity, and FIFO read-writes then complete the communication of big data quantity.
Operation of the present utility model comprises the steps：
Step 1：Open power supply of the present utility model, starter；
Step 2：The type of the pumping signal produced required for being input into from matrix keyboard module.Here, in fig. 2
" waveform " is exactly the type of representation signal, when the key is pressed, the meeting signal that display can be produced in LCD liquid crystal display screen
Type and its corresponding numbering；Then, choose and press corresponding numbering, and press " it is determined that " key, just complete to excitation letter
The selection of number type.
Step 3：The frequency of the pumping signal produced required for being input into from matrix keyboard module.It is to press " frequency " first
Key, is secondly input into specific numeral；" unit " this key is pressed afterwards, can show specific unit (example in LCD display module
Such as Hz, KHz and MHz etc.) and its corresponding numbering, then, choose and press corresponding numbering, and press " it is determined that " key, it is just complete
Into the selection of the cps to pumping signal.
Step 4：The phase place of the pumping signal produced required for being input into from matrix keyboard module.It is to press " phase place " first
Key, secondly input is specific digital, and press " it is determined that " key, just complete the selection of the phase place to pumping signal.Here phase place is
To spend (angle) as unit.
In step 2, step 3 and step 4, if wrong in input numeral, " removing " key can be pressed, to former input
Numeral be purged, then re-enter again.
Step 5：The generation of pumping signal.Press in matrix keyboard module " it is determined that " key, and it is input into 0000, then by " it is determined that "
Key, device is by the pumping signal required for producing, and it is sharp on the holding wire for output of " the DDS units " of device to export this
Encourage signal.
Step 6：The cancellation of pumping signal." removing " key is pressed in matrix keyboard module, then stop output drive signal.
Step 7：If desired other pumping signals are produced, then goes to step 2.If no longer needing to produce other excitation letters
Number, then go to step 8.
Step 8：The power supply of shutoff device.Operating process to whole device terminates.
Above-described embodiment is this utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned
The restriction of embodiment, it is other it is any without departing from the change made under spirit of the present utility model and principle, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, are included within protection domain of the present utility model.
Claims (9)
1. it is a kind of for capacitance touch screen test pumping signal generating meanss, it is characterised in that：It is mono- including control unit, DDS
Unit, FPGA unit, matrix keyboard, LCD display module, signal waveform memory module and usb interface module；Wherein, FPGA unit
It is connected with LCD display module, matrix keyboard, DDS units, control unit, usb interface module respectively；Control unit respectively with USB
Interface module, DDS units, FPGA unit, the connection of signal waveform memory module.
2. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 1, it is characterised in that：Described
Control unit is STC90 single-chip microcomputers.
3. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 1, it is characterised in that：Described
DDS units are AD9954 chips.
4. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 1, it is characterised in that：Described
FPGA unit is fpga chip EP1C3T144C8.
5. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 4, it is characterised in that：Described
The structure of matrix keyboard module is as follows：For 4 × 4 determinant matrix keyboard, 4 row input lines and 4 column output lines respectively with
8 input ports of FPGA unit are connected.
6. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 1, it is characterised in that：Described
LCD display module is LCD12864 LCDs.
7. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 1, it is characterised in that：Described
Signal waveform memory module is SDRAM memory.
8. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 7, it is characterised in that：Described
SDRAM memory of the signal waveform memory module for 64M.
9. the pumping signal generating meanss of capacitance touch screen test are used for according to claim 1, it is characterised in that：Described
Usb interface module is CY7C68013A chips.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621074595.6U CN206038809U (en) | 2016-09-22 | 2016-09-22 | A drive signal generating device for capacitive touch panel test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621074595.6U CN206038809U (en) | 2016-09-22 | 2016-09-22 | A drive signal generating device for capacitive touch panel test |
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| Publication Number | Publication Date |
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| CN206038809U true CN206038809U (en) | 2017-03-22 |
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| CN201621074595.6U Expired - Fee Related CN206038809U (en) | 2016-09-22 | 2016-09-22 | A drive signal generating device for capacitive touch panel test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112882879A (en) * | 2021-02-04 | 2021-06-01 | 北京小米移动软件有限公司 | Detection method and device of touch screen and storage medium |
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2016
- 2016-09-22 CN CN201621074595.6U patent/CN206038809U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112882879A (en) * | 2021-02-04 | 2021-06-01 | 北京小米移动软件有限公司 | Detection method and device of touch screen and storage medium |
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