WO2008014652A1

WO2008014652A1 - Infrared touch device of anti-jamming type and positioning method thereof

Info

Publication number: WO2008014652A1
Application number: PCT/CN2007/001181
Authority: WO
Inventors: Chunjing Zhou; Ruxi Lu
Original assignee: Vtron Technologies Ltd.
Priority date: 2006-07-27
Filing date: 2007-04-12
Publication date: 2008-02-07
Also published as: CN100589070C; CN1945514A

Abstract

An anti-jamming infrared touch apparatus is provided, and includes one or more group of transmitting modules and receiving modules which arrange in the longitudinal and transverse direction, the transmitting modules connect to each other through a synchronous signal line, the receiving modules connect to a bus through a synchronous signal line. the receiving module and the transmitting module both include a slave microprocessor, the infrared positioning touch apparatus also includes a main microprocessor. The main microprocessor outputs a reference synchronous signal to the slave microprocessors of all the transmitting modules and the salve microprocessors of all the receiving modules, generates a specific synchronous signal from the reference synchronous signal configuration based on a need of the time sequences staggered, scans the 1st to the nth transmitting tube and receiving tube one by one, a pair of infrared transmitting and receiving tubes of each group of transmitting modules and receiving modules synchronously work, but the corresponding infrared tubes of at least one adjacent or apart other transmitting and receiving modules group utilize the asynchronous work mode. The anti-jamming infrared touch apparatus and the positioning method have strong anti-jamming ability, quickly processing speed and can be adopted for positioning the large screen.

Description

Anti-interference type infrared touch device and positioning method

[Technical Field]

The present invention relates to an infrared positioning technology and device, and more particularly to an anti-interference type infrared touch device and a positioning method applied to an electronic display device or other writing plane for capturing and reproducing a writing track. 【Background technique】

Electronic touch technology provides great convenience for human-computer interaction, and technically provides a variety of solutions, and performance and reliability are constantly improving. At present, there are two common methods on the market: one is passive, using resistors, capacitors, and infrared scanning technology. The feature is that the pen can be used as a positioning device without special treatment. The other is active mode, such as Electromagnetic positioning, ultrasonic positioning, this method requires a specially made electronic pen to be used, once the pen is lost or damaged, the entire positioning system can not work. With the continuous development of touch technology, infrared scanning positioning technology has its unique advantages, such as complete light transmission and wear resistance compared with resistance and capacitance positioning; compared with electromagnetic positioning technology, infrared positioning technology It is easy to use without using a special electronic pen. In addition, infrared positioning technology can easily produce large-size touch screens, which can be used in rear projection TVs, front projectors, or PDP/LCD display devices. Due to the complete light transmission of infrared positioning, several other positioning techniques cannot be compared. Although infrared positioning technology has many advantages, because the size of the infrared tube limits the improvement of resolution, the infrared emitting tube has a fixed emission angle, and the infrared tubes interfere with each other; the reflection of light causes the writing object to block the infrared light path; The large-size infrared technology touch screen refresh rate is slow; using traditional processing technology, infrared positioning technology can only be used for small-sized touch screens and low positioning accuracy requirements, far from the requirements of handwriting writing. In order to expand the application range and positioning and capture effect of infrared positioning technology, a lot of research has been done at home and abroad, such as the domestic 03113702. 4 introduced the method of improving the resolution of the infrared touch device, which involves only a theoretical The mathematical model does not take into account the specific problems of the infrared touch device, and there is no way to form a successful product.

The existing infrared positioning touch device adds a light guiding hole to the edge of the screen to improve the anti-interference. As shown in FIG. 12, the light guiding hole is a housing integrated with the frame, and the infrared emitting tube and the receiving tube are aligned with the light guiding hole to suppress The interference between the infrared tubes, but the process of aligning the infrared emitting and receiving tubes with the light guiding holes increases the difficulty of the production process.

1 is a schematic diagram showing the structure and optical path of an infrared positioning touch device according to the present invention. As shown in the figure, there are three sets of transmitting and receiving modules in the X direction, and three sets of transmitting and receiving modules in the Y direction. FIG. 3 is a schematic diagram of an infrared tube scanning operation of a general infrared positioning technology adjacent to or separated from a transmitting or receiving module. Because the infrared emission tube has a certain emission, it is indeed 1 Angle P, the emission range of the transmitting tube on the transmitting module will cover the infrared receiving tube of the adjacent or separated module, so if the infrared touch device adopts the general scanning method shown in Figure 3, the infrared tube of m is used as an example to illustrate its scanning. The limitation of the method, the infrared light emitted by the m-type infrared transmitting tube of X_SND2 (transmitting module 2) shown in Fig. 1 will be the same as the receiving module of X-RCV1, X_RCV2, X-RCV3 (receiving module 1, 2, 3). The m-receiver is received by the infrared receiver. When the obstruction is in the position of the obstruction 2, the light blocked by the obstruction will affect the receiving tube m of X-RCV1, X_RCV2, X_RCV3 at the same time, so that the receiving modules X_RCV1, X_RCV2, X-RCV3 will simultaneously detect the occlusion information, so that Three occlusion positions are detected simultaneously in the X direction, and in the same Y direction, there is also a problem that multiple occlusion information is detected at the same time, so that the positioning device cannot determine the specific occlusion position, and under the condition of the transmission angle P-determination, The size of the infrared touch device is increased, the launch tube m will interfere with the corresponding infrared tube of more modules, and the other infrared tubes are also the same principle; the infrared touch device involves scanning a large number of infrared tubes, in the large-sized infrared In the touch device, a plurality of microprocessors are also involved, so that it takes a lot of time to complete the scanning of a large number of infrared tubes and the communication between a plurality of microprocessors, and the time taken by the general scanning method and the master-slave calling mode is adopted. Too long, seriously affecting the writing speed and effect of the infrared touch device; infrared light as a form of light, The problem of reflection, as shown in the optical path 4 and the optical path 5 in Fig. 1, the infrared light emitted by the infrared emission tube at the corner of the infrared positioning frame is emitted along the reflecting surface formed at the edge of the infrared positioning frame, causing the writing object to be in some The area cannot be written normally; the infrared touch device is a touch technology that requires various sizes and adopts a traditional design structure, which cannot meet the requirements of flexible design of various sizes.

Therefore, it is desirable to provide an infrared touch device and a positioning method which are simple in structure, high in resolution, high in anti-interference, fast in refreshing speed, and suitable for large-screen positioning.

[Summary of the Invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an anti-interference type infrared touch device and a positioning method which are strong in anti-interference, fast in processing, and suitable for large-screen positioning.

In order to achieve the above object, the present invention adopts the following technical solution: an anti-interference type infrared touch device is provided, which comprises one or more sets of transmitting modules and receiving modules arranged in the longitudinal and lateral directions, and each transmitting module passes between The synchronization signal lines are connected, and each receiving module is connected to the bus through a synchronization signal line, and each of the receiving module and the transmitting module is controlled by a slave microprocessor, and the infrared positioning touch device further comprises a main microprocessor, the main micro The processor can share a microprocessor with one of the slave microprocessors. The slave microprocessor of the transmitting module is connected to the main microprocessor through a synchronous signal line, and the slave module of the receiving module is connected to the main microprocessor through a bus and a synchronous signal line, and the main microprocessor outputs a reference synchronization signal to all Transmitter module slave microprocessor and all receiver modules slave microprocessor, and slave bus The occlusion information detected by each receiving module is obtained, the touch position calculation is performed, and the calculation result is sent to the computer. The slave microprocessor of each receiving module transmits the detected touch information or other debugging information to the main microprocessor in a time-sharing manner through a bus interface, and the information is generally transmitted from the microprocessor to the master in an active form. microprocessor. Meanwhile, in order to further eliminate the interference phenomenon between the infrared tubes at the corners, the adjacent transmitting modules and the receiving modules located at at least one corner of the anti-interference type infrared touch device adopt a timing shifting operation mode.

The schematic diagrams of the transmitting module and the receiving module are as shown in FIGS. 4 and 5. The infrared transmitting tube of the transmitting module and the receiving module, the row array scanning of the infrared receiving tube are connected with the microprocessor, and the column array scanning of the infrared transmitting tube is high. The modulation signals output by the frequency modulator are connected, the column array scan of the infrared receiving tube is connected to the output modulation signal of the high frequency modulator, and the high frequency modulator scans the same frequency with the array of the transmitting tube array.

The schematic diagram of the main microprocessor is shown in FIG. 6, wherein the port of the main microprocessor having the PWM output function is connected to the port having the interrupt function from the microprocessor, and the microprocessor of each receiving module can pass the I2C interface. Or the SPI interface is connected to the main microprocessor. The transmitting modules are connected by a power line, a ground line, a transmitting infrared tube power line, and a synchronous signal line, and the receiving modules are connected by a power line, a ground line, a synchronous signal line, an I2C bus clock line, and an I2C bus data line. The main microprocessor can share a microprocessor with one of the slave microprocessors. A light-transmitting sheet that prevents dust and is resistant to external light is mounted on the frame of the four edges of the capture plane of the infrared touch device. And the infrared tube of at least one of the emission sides of the anti-interference type infrared touch device and/or at least one end of the at least one receiving side is offset by a certain angle. In order to prevent infrared light from forming reflection on the translucent sheets of the four edges, the infrared ray positioning of the plurality of infrared tubes at the four corners of the touch device is offset by a certain angle, and the optimal solution is to use 3-10 according to different sizes of the touch device. The infrared tubes are offset from the center of the screen by a certain angle.

A positioning method using the above-mentioned anti-interference type infrared touch device: the transmitting module and the receiving module generate a specific synchronization signal in response to the reference synchronization signal provided by the main microprocessor to scan the first to Nth transmitting tubes and the receiving tube one by one, The infrared transmitting and receiving of each group of transmitting modules and receiving modules are synchronously operated, and the corresponding infrared tubes of at least one adjacent or separated other transmitting module and receiving module group are operated in a staggered manner, and the specific synchronization signal is The reference synchronization signal is configured according to the need for timing offset.

The slave microprocessor of each receiving module transmits the detected touch information or other debugging information to the main microprocessor through a bus interface through a bus interface, and is generally transmitted by using an I2C communication interface. At the same time, the adjacent transmitting module located at at least one corner of the anti-interference type infrared touch device and the infrared tube corresponding to the receiving module adopt a timing staggered operation mode.

Each pair of infrared transmitting and receiving modules has only one pair of infrared pair tubes working at the same time, and the timings of the corresponding infrared pair tubes of the adjacent boards are inconsistent, that is, the scanning mode with timing offset is adopted; the infrared receiving tube is connected The received infrared transmitting tube sensing signal is subjected to a microprocessor-controlled scanning circuit, and the detecting circuit detects the wave, and the amplification tube is used as a core. The negative pressure generator, the resistor, the capacitor, and other discrete components cooperate to amplify the signal received by the infrared tube. After the ADC (Analog-to-Digital Converter), the light intensity signal of the infrared tube is converted into a digital signal; the main microprocessor calculates the detected occlusion information to form coordinate information through the USB interface or RS- The 232 serial interface is sent to the computer. Each transmitting module or receiving module is controlled by a slave microprocessor. All slave transceivers that control transmission and reception work under the coordination of a master microprocessor. The slave modules of each receiver module pass the I2C interface or SPI interface. Connected to the main microprocessor, each of the receiving module and the transmitting module is connected to a port of the main microprocessor having an output function, and the synchronous operation of the entire infrared positioning touch device is realized. .

The anti-jamming infrared touch device of the present invention can also adopt a modular production process, and each transmitting module or receiving module adopts a modular design, that is, each module is controlled by a separate microprocessor. By changing the number of transmitting modules, the number of receiving module pairs or the number of infrared tubes on the transmitting module and the receiving module, it is possible to flexibly emit infrared positioning touch devices of different size requirements.

Compared with the prior art, the present invention has the following beneficial effects:

The invention adopts a light-transmitting sheet for preventing dust and external light interference, which not only improves the anti-interference of the infrared touch device, but also simplifies the production process, and has obvious effects both in process and in cost. The adjacent or spaced apart transmitting and receiving modules of the present invention improve the anti-interference of the infrared positioning touch device by using a special timing staggering operation mode. In order to improve the refresh speed of the large-size infrared positioning touch screen, the I2C adopts a special time-sharing working time mode to avoid bus conflict, which greatly improves the speed at which the infrared positioning touch device processes the occlusion information data, and completes the trajectory capturing on the large-sized touch screen. The effect is remarkable.

[Description of the Drawings]

1 is a schematic view showing the structure and optical path of an infrared positioning touch device of the present invention;

2 is a schematic diagram showing the distribution of a microprocessor of the anti-interference type infrared touch device of the present invention;

3 is a timing chart of an infrared tube scanning operation of a conventional infrared touch device;

4 is a schematic diagram of the principle of the transmitting module of the present invention;

Figure 5 is a schematic diagram of the principle of the receiving module of the present invention;

6 is a schematic diagram of the principle of the main module of the present invention;

Figure 7 is a schematic diagram showing the connection relationship between modules of the present invention;

8 is a timing chart of scanning operation of a transmitting module or a receiving module of the anti-jamming infrared touch device of the present invention;

9 is an adjacent or separated transmission module and a receiving module in the X direction of the anti-interference type infrared touch device of the present invention; The timing diagram of the working state of the corresponding infrared tube;

10 is a timing diagram showing the working states of the corresponding infrared tubes of the adjacent transmitting module and the receiving module at the lower left corner of the anti-interference type infrared touch device of the present invention;

11 is a timing chart showing the operation of detecting the occlusion information detected by the I2C line of the anti-interference type infrared touch device of the present invention;

Fig. 12 is a schematic view showing an infrared positioning touch device equipped with a light guiding hole.

【Detailed ways】

Referring to FIG. 1 , the anti-jamming infrared touch device of the present invention has a plurality of sets of spliced infrared transmitting modules and receiving modules arranged in the X and Y coordinate directions, and corresponding transmitting module and receiving module requirements in the X-axis direction and the Y-axis direction. Strict alignment. Three pairs are installed in the X-axis direction: X_SND1, X_RCV1 _; X-SND2, X_RCV2; X-SND3, X-RCV3. Three pairs are installed in the Y-axis direction: Y_SND1, Y_RCV1; Y_SND2, Y_RCV2; Y_SND3, Y_RCV3; For other embodiments, the number of transmitting modules and receiving modules in the X and Y directions can be changed to form infrared touch devices of different sizes. There are N infrared tubes on each transmitting module or receiving module. According to the size and size requirements of the infrared touch screen, the number of transmitting modules and receiving modules or the number of infrared tubes on the transmitting module and the receiving module can be increased or decreased. In order to avoid infrared light reflection interference, 3-5 infrared tubes on the four corners of the infrared touch device are offset to the center of the screen, and in the anti-interference type infrared touch device, each of the transmitting module and the receiving module respectively includes From the microprocessor, the anti-interference type infrared touch device further includes a main microprocessor. In this embodiment, the main microprocessor shares a microprocessor with one of the slave microprocessors and is integrated in a main module. On, that is, the main microprocessor + X-RCV1 in Figure 2, the main microprocessor and the slave microprocessor are distributed as shown in Figure 2.

The connection relationship between modules is shown in Figure 7:

1. Each transmitting module is connected by a power line, a ground line, a transmitting infrared tube power line, and a synchronous signal line.

2. Each receiving module is connected by a power line, a ground line, a synchronous signal line, an I2C bus clock line, and an I2C bus data line.

3. Interface between the main module and the transmitting module:

Use +5V, GND to supply power to the MCU, logic IC, etc. of the transmitting module;

The LED-VCC is used to supply power to the anode of the launch tube, and the independent power supply is used to avoid interference with the +5V power supply;

The main module provides the synchronous clock SYNC to the transmitting module, and each receiving and transmitting module cooperates to complete the positioning work. 4. Interface between the main module and the receiving module:

Use +5V and GND to supply power to the entire receiving module.

The main module provides the receiving module with a synchronous clock SYNC, and each receiving and transmitting module cooperates to complete the positioning work; The main module communicates with the receiving module by the data line and clock line (SDA, SCL) of the I2C bus. The command of the main module is sent to the receiving module through the I2C bus, and the receiving module uploads touch coordinate information or other debugging information through the I2C bus.

The main microprocessor has an output function port connected with the infrared transmitting module and the receiving module from the microprocessor having an interrupt function to realize the synchronous timing signal of the entire infrared scanning positioning touch device. In the synchronization of the synchronization signal, the transmitting module and the receiving module in the X direction are taken as an example, and the scanning method is as shown in FIG. 8 , and the first to Nth transmitting and receiving tubes are scanned one by one to realize the transmitting module and the receiving module of each group. The infrared transmitting and receiving pairs work synchronously with the tubes, and the corresponding infrared tubes of the adjacent transmitting modules and the receiving module groups operate asynchronously; in addition to the synchronization signals, the slave microprocessor of the receiving module and the main microprocessor also need an I2C interface. Through the I2C communication interface, each receiving module transmits the detected touch signals to the main microprocessor in a time-sharing manner, thereby improving the scanning speed and reliability of different sizes, especially large-sized infrared touch screens.

The present invention devises a particular timing that effectively avoids interference due to the angle of emission of the infrared transmitting tube. Each of the infrared pair tubes is scanned one by one at the timing shown in FIG. 9. At the same time, only one pair of infrared tubes are in a working state on a pair of transmitting modules and receiving modules, but the corresponding pairs of tubes on different pairs of transmitting and receiving modules work. The time is designed to be inconsistent. Take the No. 2 pipe in Figure 1 as an example, that is, when the transmitting module X_SND2 and the receiving module X_RCV2 are working on the infrared pair 2, the transmitting modules X_SND1, X-SND3 and the receiving modules X-RCV1, X-RCV3 The No. 2 infrared pair tube is in a stopped state. Referring to FIG. 9, the working timing mode is adopted, even if the No. 2 transmitting tube of the X-SND2 is irradiated to the corresponding No. 2 infrared receiving tube of the adjacent receiving module, but due to the simultaneous engraving, the adjacent board 2 The tube is in the stopped state. When the obstruction is in the position of the obstruction 2, only X_RCV2 detects the occlusion information, so only one occlusion information is detected in the X direction, and only one occlusion information is detected at the same time in the Y direction. . In this way, multiple pieces of information are not detected at the same time, that is, accurate occlusion information can be judged.

At the same time, the infrared transmitting tube receiving tube corresponding to the transmitting module and the receiving module adjacent to the lower left corner of the infrared touch device shown in FIG. 1 is designed to operate at different timings, and still takes the No. 2 tube as an example, that is, the transmitting module Y1 When the SND1 and the receiving module Y-RCV1 are operated by the infrared pair tube No. 2, the infrared pair tube of the receiving module X_RCV1 and the transmitting module X_SND1 is in a stopped state. Referring to FIG. 10, in this working timing mode, even if the No. 2 transmitting tube of the Y-SND1 illuminates the corresponding No. 2 infrared receiving tube of the adjacent board X-RCV1, the No. 2 tube of the X_RCV1 board is simultaneously engraved. In the stopped state, the transmitting module X_SEND3 and the receiving module Y-RCV3 in the upper right corner of the touch device are also designed to operate at different timings. Therefore, the infrared tube of the receiving module in the lower left corner and the upper right corner at the same time can not receive the infrared light emitted by the adjacent transmitting module infrared tube, so that no interference occurs, and the infrared touch device can accurately detect the specific position information of the covering object.

The I2C bus of the present invention completes communication between the main module and each receiving module, and the command of the main module passes the I2C The bus is sent to each receiving module, and the receiving module uploads touch information or other debugging information through the I2C bus. The invention improves the refreshing speed of the large-sized infrared positioning touch screen, and the I2C communication uses a special working time mode to avoid bus conflict, greatly improving the speed of the infrared positioning touch device processing the occlusion information data, and completing the trajectory capturing on the large-sized touch screen. The effect is remarkable. As shown in Figure 11, under normal operation, each receiving module counts the sync pulse. When the counted number of pulses is 16 times the number of the receiving module, if the occlusion information is detected, the transmission detection starts at that moment. The occlusion information is sent to the main microprocessor; this avoids the bus conflict caused by the simultaneous transmission of occlusion information after all the infrared tubes are scanned in the general method, and improves the refresh rate.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any insubstantial changes based on the technical solutions of the present invention are included in the scope of the present invention. .

Claims

Claim

An anti-interference type infrared touch device comprising one or more groups of transmitting modules and receiving modules arranged in the longitudinal and lateral directions, wherein each of the transmitting modules is connected by a synchronous signal line, each The receiving modules are connected to the bus through a synchronous signal line, and the receiving module and the transmitting module are both controlled by a slave microprocessor. The infrared positioning touch device further comprises a main microprocessor, and the slave module of the transmitting module passes the synchronous signal line. Connected to the main microprocessor, the slave module of the receiving module is connected to the main microprocessor via a bus and a synchronizing signal line, and the main microprocessor outputs a reference synchronizing signal to the slave microprocessor and all receiving modules of all transmitting modules. The slave microprocessor obtains the occlusion information detected by each receiving module from the bus, performs touch position calculation, and sends the calculation result to the computer.

2. The anti-jamming infrared touch device according to claim 1, wherein at least one end of at least one of the emission sides of the anti-interference type infrared touch device and/or at least one end of the at least one receiving side are biased by an infrared tube A certain angle.

3. The anti-jamming infrared touch device according to claim 1, wherein the infrared transmitting tube of the transmitting module and the receiving module, the row driving of the infrared receiving tube are connected to the microprocessor, and the column driving of the infrared transmitting tube is The modulation signals outputted by the high frequency modulator are connected, and the column drive of the infrared receiving tube is connected to the output modulation signal of the high frequency modulator, and the chirp frequency modulator drives the same frequency as the transmitting tube column.

4. The anti-jamming type infrared touch device according to claim 1, wherein a light-transmitting sheet is mounted on a frame of the four edges of the capturing plane of the infrared touch device.

The anti-interference type infrared touch device according to claim 1, wherein the main microprocessor shares a microprocessor with one of the slave microprocessors.

6. The anti-jamming infrared touch device according to claim 1, wherein two or more transmitting modules share a slave microprocessor.

7. The anti-interference type infrared touch device according to claim 1, wherein two or more receiving modules share a slave microprocessor.

8. A method for locating an anti-jamming infrared touch device, characterized in that the anti-interference type infrared touch device comprises one or more groups of transmitting modules and receiving modules arranged in the longitudinal and lateral directions, or between the transmitting modules or Each receiving module is connected by a synchronous signal line and a bus, and the receiving module and the transmitting module respectively include From the microprocessor, the slave microprocessor is connected to the main microprocessor through a bus interface, and the transmitting module and the receiving module generate the specific synchronization signals in response to the reference synchronization signal to scan the first to Nth transmitting tubes and the receiving tubes one by one, each The infrared transmitting and receiving of the group transmitting module and the receiving module are synchronously operated, and the corresponding infrared tubes of at least one adjacent or separated other transmitting module and the receiving module group are operated in a staggered manner, and the specific synchronization signal is a reference. The sync signal is configured according to the need for timing offset.

The positioning method according to claim 8, wherein the slave microprocessor of the receiving module transmits the detected touch information or other debugging information to the master in a time-sharing manner through a bus interface. microprocessor.

The positioning method according to claim 8, wherein the adjacent transmitting modules located on at least one corner of the anti-interference type infrared touch device and the corresponding infrared tubes on the receiving module are operated in a time-staggered manner .