WO2014121501A1 - Method for implementing infrared touch screen based on infrared optical sensor - Google Patents

Method for implementing infrared touch screen based on infrared optical sensor Download PDF

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Publication number
WO2014121501A1
WO2014121501A1 PCT/CN2013/071539 CN2013071539W WO2014121501A1 WO 2014121501 A1 WO2014121501 A1 WO 2014121501A1 CN 2013071539 W CN2013071539 W CN 2013071539W WO 2014121501 A1 WO2014121501 A1 WO 2014121501A1
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Prior art keywords
infrared
unit
receiving
touch screen
sensitive
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PCT/CN2013/071539
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French (fr)
Chinese (zh)
Inventor
刘卫
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深圳富创通科技有限公司
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Priority to CN201380003131.9A priority Critical patent/CN104115104A/en
Priority to PCT/CN2013/071539 priority patent/WO2014121501A1/en
Publication of WO2014121501A1 publication Critical patent/WO2014121501A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means

Definitions

  • the invention relates to an infrared touch screen, in particular to an implementation method of an infrared light sensitive touch screen based on infrared light.
  • Infrared touch screen is using X, Y An infrared matrix densely directional to detect and locate the user's touch device.
  • the infrared touch screen is provided with a circuit board outer frame on the front side of the display, and the circuit board arranges an infrared transmitting tube and an infrared receiving tube on four sides of the screen, and one-to-one correspondingly forms an infrared matrix which is horizontally and vertically crossed.
  • the finger blocks the two infrared rays passing through the position, so that the touch point can be judged on the screen.
  • X, Y coordinates When the user touches the screen, the finger blocks the two infrared rays passing through the position, so that the touch point can be judged on the screen.
  • the infrared receiving tube is further divided into an infrared photo transistor and an infrared photodiode.
  • the signal output from the receiving and selecting unit is a modulated signal, which is first converted into a DC signal through a demodulation circuit module, and then amplified by an amplifying circuit to a convenient collection. level. Due to the need to demodulate the signal, a more complicated demodulation circuit is used in the circuit, so that these circuits introduce a large delay, resulting in slow signal response and limited acquisition speed. Multi-touch screens generally need to collect more signals for calculation, and the scheme has a slower acquisition speed, which makes the scheme unable to adapt to multi-touch screen projects.
  • the existing infrared touch screen is only applied to a small-sized single-point touch screen, and the infrared receiving tube in the infrared multi-touch screen uses an infrared photodiode.
  • the infrared photodiode has a poor ability to sense light, that is, the current changes from no emission to when there is emission, so the current signal needs to be changed to a voltage signal.
  • a resistor is required in the vicinity of each receiving diode.
  • the voltage signal is transmitted, it is necessary to use a pull-down resistor for each receiving tube to ensure that it is at a stable low level without illumination, that is, the signal modulation conversion circuit has to be placed nearby, which leads to the need to utilize more of the technical solution.
  • Logic devices and analog devices make the circuit complex and costly to implement, and an increase in the number of devices may also cause an increase in the failure rate.
  • the invention provides an implementation method of an infrared photosensitive screen based on infrared light sensing, which can simplify the circuit and reduce the cost while ensuring the response speed.
  • the infrared light-sensitive infrared touch screen comprises an infrared emitting unit, an infrared receiving unit, an amplifying unit, a power source and an MCU a processor, wherein the power supply provides power to the infrared transmitting unit and the infrared receiving unit;
  • the infrared receiving unit comprises a receiving and selecting unit and a receiving tube array unit, wherein the receiving tube array unit is provided with infrared light sensing Transistor, including the following steps:
  • the infrared receiving unit receives a signal, performs signal amplification by the amplifying unit, and sends the signal to the MCU
  • the processor performs sampling processing, and the MCU processor performs sampling processing by using a single pulse sampling manner
  • the MCU processor controls timing of the infrared transmitting unit and the infrared receiving unit.
  • sampling is performed before the signal of the infrared phototransistor reaches a steady state.
  • the above-mentioned infrared emitting unit performs infrared ray emission after increasing the transmission power of the infrared transmitting tube, that is, it uses an ordinary higher power for transmitting an external line.
  • the above MCU processor uses an adaptive algorithm to algorithmically correct the discriminant threshold of the infrared phototransistor.
  • the above-mentioned receiving tube array unit adopts a matrix layout.
  • the receiving and addressing unit includes a control circuit module for controlling a row signal in the receiving tube array unit and a gate circuit module for gating a column signal in the receiving tube array unit.
  • control circuit module is a chip of the type 74XX138.
  • the gating circuit module described above is a chip of the type 74XX4051.
  • the above amplifying unit uses a primary to secondary operational amplifier and uses a dual power operational amplifier chip.
  • the technical solution disclosed in the application of the present invention does not require a demodulation circuit, and has the advantages of simple circuit and short response time. Significantly reduces costs and reduces the probability of hardware failure.
  • the single-pulse acquisition method is adopted, and the acquisition speed is also improved, which can be adapted to the requirements of multi-point speed.
  • FIG. 1 is a structural block diagram of an infrared touch screen of the present invention
  • FIG. 2 is a schematic view of a receiving tube array unit of the present invention
  • FIG. 3 is a schematic diagram of a control circuit module for receiving a location unit according to the present invention.
  • FIG. 4 is a schematic diagram of a gating circuit module of a receiving address unit according to the present invention.
  • Figure 5 is a circuit diagram of an amplifying unit of the present invention.
  • Figure 6 is a process flow diagram of the present invention.
  • FIG. 7 is a schematic diagram of processing of a timer of the present invention.
  • FIG. 8 is a waveform diagram of the signal of the present invention after being amplified by a unit.
  • the invention discloses an implementation method of an infrared photosensitive screen based on infrared light sensing, wherein, referring to FIG. 1 As shown, the infrared light-sensitive infrared touch screen includes an infrared emitting unit 1, an infrared receiving unit 2, an amplifying unit 3, a power source 4, and an MCU processor 5, wherein:
  • the power supply 4 provides power to the infrared transmitting unit 1 and the infrared receiving unit 2; the entire system is USB from the PC The interface is powered, the USB interface supply voltage is 5V, and the maximum supply current is 500mA.
  • Infrared transmitting unit 1 , infrared receiving unit 2 is directly used 5V power supply; MCU processor 5 Using a 3.3V power supply, therefore, using the LDO circuit module 6 converts the 5V voltage of the USB interface to 3.3V to accommodate the needs of the MCU processor 5 chip.
  • the infrared emitting unit 1 includes a transmitting and selecting unit 11 and a transmitting tube array unit 12, and a transmitting tube array unit.
  • the launch tube is provided on the 12th.
  • the infrared emitting unit 1 performs the infrared emission after increasing the transmitting power of the infrared transmitting tube, that is, it uses the higher power than the conventional one to perform the external line emission. After this adjustment, the power consumption of the whole machine is controlled at 200 ⁇ 300mA, and the maximum current that the USB interface can provide is 500mA. , within the available range.
  • the infrared phototransistor has a short response speed.
  • the MCU processor 5 is used to control the timing of the infrared transmitting unit 1 and the infrared receiving unit 2; in specific implementation, the MCU Processor 5 uses a 32-bit high-performance processor model STM32F103C8 that runs all control logic and data processing algorithms. MCU The processor controls the timing of the infrared transmitting array by controlling the transmitting addressing circuit; and the MCU controls the timing of the infrared receiving array by controlling the receiving addressing circuit. Receive signal to MCU sample processing, MCU After sampling all the lamps, the arithmetic algorithm is processed centrally, and the touch coordinates are calculated and sent to the PC via USB.
  • the infrared receiving unit 2 includes a receiving and selecting unit 21 and a receiving tube array unit 22, and a receiving tube array unit 22 An infrared phototransistor is provided thereon.
  • the receiving tube array unit 22 adopts a matrix layout, and may be adopted according to the size of the touch screen. 8X8 array or 8X12 array.
  • the advantage of this layout is that there are fewer control lines.
  • the 8X8 array only needs 16 pins to control 64.
  • the signal acquisition of one receiving tube; the control is also relatively simple, for example, the first line of control line is set high, the other line control lines are set low, and then the first column is strobed for acquisition, and the first receiving tube in the upper left of Fig. 2 is collected. signal of.
  • the receiving tube array unit 22 of the present invention compared with the existing array of photodiodes, the required components are reduced, and the circuit is simple.
  • the receiving location unit 21 includes a pair of receiving tube array units 22
  • the control circuit module for controlling the row signal and the gate circuit module for gating the column signal in the receiving tube array unit 22.
  • the control circuit module controls the line signals in the receiving tube array unit 22.
  • it uses a piece 74XX138 chip, ie 3-8 decoder, when the address input (A/B/C) of the decoder is 000, the output of chip Y0 is low, other Y1-Y7 The output is high so that the first row of the receive tube array unit 22 can be enabled.
  • the gate circuit module gates the column signals in the receiver array unit 22.
  • it is a piece 74XX4051, the analog selector.
  • the address selection input (A/B/C) input of the chip is 000
  • the first channel is gated, that is, the X0 pin is transmitted to X. Pin.
  • the signal passes through the amplification unit (demodulation unit), it enters the MCU unit for sampling.
  • the receiving and locating unit 21 in the application of the present invention uses an analog selector with the existing diode, and uses 9 pieces of 74XX4051. Compared with the two-stage voltage selection circuit, the receiving address unit of the present invention is simple to sample, and avoids the need for a considerable number of 74XX4051 chips as in the conventional diode scheme.
  • the amplification unit 3 uses a primary to secondary op amp and uses a dual power op amp chip.
  • it is modeled as The chip of the LM828, which is a negative power chip, provides negative voltage for the op amp chip.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the invention is An infrared light-sensitive infrared touch screen implementation method adopts the infrared light-sensitive infrared touch screen disclosed above, which comprises the following steps:
  • the infrared light is received by the infrared phototransistor of the infrared receiving unit 2, and the infrared receiving unit 2 receives the signal and passes through the amplifying unit 3
  • the signal is amplified and sent to the MCU processor 5 for sampling processing, and the MCU processor 5 uses a single pulse sampling method for sampling processing; a single pulse sampling method is adopted.
  • the MCU processor 5 controls the timing of the infrared transmitting unit 1 and the infrared receiving unit 2.
  • the MCU processor 5 After powering up the system, the MCU processor 5 The control program in the middle begins to execute, and the control program first performs system initialization, that is, configures the control pin of the transmitting and addressing unit 11, the control pin of the receiving and addressing unit 21, and the USB. Interface and acquisition pins; then collect a set of sample values as a reference value.
  • system initialization that is, configures the control pin of the transmitting and addressing unit 11, the control pin of the receiving and addressing unit 21, and the USB. Interface and acquisition pins; then collect a set of sample values as a reference value.
  • the scanning process is MCU
  • the transmitting and selecting location unit is controlled to control the transmitting tube array to emit light one by one, and then the receiving and selecting unit is controlled to strobe the corresponding signal of the transmitting tube array for sampling until all the lamps are sampled, and only one transmitting tube emits light at a time.
  • a packet of sampled data is obtained. Then perform the point algorithm and the tracking algorithm, and finally pass The USB interface is reported to the computer.
  • the timing sampling of the transmit tube is typically implemented using a timer interrupt. After starting a round of sampling, the timer interrupt is configured on the software, and then the timer interrupts the interval to touch the acquisition program, and the signal sampling for each receiving tube is completed in turn.
  • FIG 8 it is an amplifying unit 3 Output waveform diagram. It adopts single-pulse sampling mode. It can be seen from the figure that the signal rises faster, even if the acquisition speed is improved, it can adapt to the multi-point speed requirement.
  • Embodiment 2 Compared with the prior art, the solution of the present invention does not use a carrier, and the part of the carrier demodulation circuit is removed, which greatly reduces the hardware cost.
  • Embodiment 2 is compared with the prior art, the solution of the present invention does not use a carrier, and the part of the carrier demodulation circuit is removed, which greatly reduces the hardware cost.
  • the difference is that it further comprises the following steps:
  • the infrared phototransistor has the disadvantage of slow response speed, it mainly shows that the signal value rises and changes slowly during scanning. If the sampling signal arrives at steady state, the cycle is too slow, and each infrared touch screen uses 300. Many pairs of infrared pair tubes (infrared emitting tubes and infrared phototransistors), the total time of one round of acquisition can not meet the needs of real-time touch control, and the use of early sampling can overcome the shortcomings of slow response of infrared phototransistors.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the difference is that it also includes the following steps:
  • the MCU processor 5 uses an adaptive algorithm to algorithmically correct the discriminant threshold of the infrared phototransistor.
  • Normal infrared phototransistor will be sampled after reaching steady state. It will be more accurate. If the sample is sampled in advance, the level has not reached the steady state. It is an intermediate process and the threshold will change. Therefore, the sampling needs to be performed. The threshold is adjusted, that is, the smaller the sample, the smaller the level rises and the smaller the threshold.
  • the internal adaptive module performs algorithmic correction on the discriminating threshold of the infrared phototransistor to overcome the defect of sampling before the signal of the infrared phototransistor reaches the steady state, and after testing, a consistent speed can be achieved.
  • the technical solution disclosed in the application of the present invention does not require a demodulation circuit, and has the advantages of simple circuit and short response time. Significantly reduces costs and reduces the probability of hardware failure.
  • the single-pulse acquisition method is adopted, and the acquisition speed is also improved, which can be adapted to the requirements of multi-point speed.

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Abstract

Disclosed is a method for implementing an infrared touch screen based on an infrared optical sensor. The infrared touch screen based on the infrared optical sensor comprises: an infrared transmitting unit, an infrared receiving unit, an amplifier unit, a power source, and an MCU processor. The power source supplies electric power to the infrared transmitting unit and the infrared receiving unit. The infrared receiving unit comprises a receiving address selecting unit and a receiving tube array unit, and an infrared optical sensor triode is provided on the receiving tube array unit. The method comprises the following steps: the infrared transmitting unit transmitting an infrared ray; the infrared optical sensor triode of the infrared receiving unit receiving the infrared ray, the amplifier unit amplifying a signal and sending the signal to the MCU processor for sampling processing, and the MCU processor performing sampling processing in a single pulse sampling manner; and the MCU processor controlling a time sequence of the infrared transmitting unit and the infrared receiving unit. The present invention does not need a demodulating circuit, and thereby has the advantages of a simple circuit and short response time.

Description

基于红外光敏的红外触摸屏的实现方法 Implementation method of infrared light sensitive infrared touch screen 技术领域Technical field
本发明涉及一种红外触摸屏，具体地讲，是指一种基于红外光敏的红外触摸屏的实现方法。  The invention relates to an infrared touch screen, in particular to an implementation method of an infrared light sensitive touch screen based on infrared light.
背景技术Background technique
红外触摸屏是利用 X 、 Y 方向上密布的红外线矩阵来检测并定位用户的触摸设备。红外触摸屏在显示器的前面安装一个电路板外框，电路板在屏幕四边排布红外发射管和红外接收管，一一对应形成横竖交叉的红外线矩阵。用户在触控屏幕时，手指就会挡住经过该位置的横竖两条红外线，因而可以判断出触摸点在屏幕的 X 、 Y 坐标。 Infrared touch screen is using X, Y An infrared matrix densely directional to detect and locate the user's touch device. The infrared touch screen is provided with a circuit board outer frame on the front side of the display, and the circuit board arranges an infrared transmitting tube and an infrared receiving tube on four sides of the screen, and one-to-one correspondingly forms an infrared matrix which is horizontally and vertically crossed. When the user touches the screen, the finger blocks the two infrared rays passing through the position, so that the touch point can be judged on the screen. X, Y coordinates.
红外接收管又分为红外光敏三极管和红外光敏二极管。当红外接收管为红外光敏三极管时，其从接收选址单元输出的信号是一个经过调制的信号，先经过解调电路模块，转换成直流信号，然后经过放大电路，放大到一个便于采集的电平。由于需要对信号进行解调处理，电路中用到了比较复杂的解调电路，这样这些电路会引入较大的延时，造成信号响应慢，限制了采集速度。多点触摸屏一般需要采集更多的信号做运算，而该方案采集速度较慢，从而导致该方案不能适应于多点触摸屏项目。 The infrared receiving tube is further divided into an infrared photo transistor and an infrared photodiode. When the infrared receiving tube is an infrared phototransistor, the signal output from the receiving and selecting unit is a modulated signal, which is first converted into a DC signal through a demodulation circuit module, and then amplified by an amplifying circuit to a convenient collection. level. Due to the need to demodulate the signal, a more complicated demodulation circuit is used in the circuit, so that these circuits introduce a large delay, resulting in slow signal response and limited acquisition speed. Multi-touch screens generally need to collect more signals for calculation, and the scheme has a slower acquisition speed, which makes the scheme unable to adapt to multi-touch screen projects.
由于红外光敏三极管具有响应速度慢的缺点，现有的红外触摸屏只将其应用在小尺寸单点触摸屏中，而红外多点触摸屏中的红外接收管都采用了红外光敏二极管。但是，红外光敏二极管对光的感应能力较差，即从无发射光到有发射光时电流变化较小，所以需要就近将电流信号变为电压信号。这样，每个接收二极管附近都需要搭配一个电阻。因为传输的是电压信号，需要每个接收管使用一个下拉电阻，保证在没有光照的情况下处于稳定的低电平，即不得不就近放置信号调制转换电路，从而导致该技术方案需要利用较多的逻辑器件和模拟器件，使得电路很复杂，且实现成本也很高，器件增多也可能造成故障率升高。 Due to the shortcomings of the infrared phototransistor, the existing infrared touch screen is only applied to a small-sized single-point touch screen, and the infrared receiving tube in the infrared multi-touch screen uses an infrared photodiode. However, the infrared photodiode has a poor ability to sense light, that is, the current changes from no emission to when there is emission, so the current signal needs to be changed to a voltage signal. Thus, a resistor is required in the vicinity of each receiving diode. Because the voltage signal is transmitted, it is necessary to use a pull-down resistor for each receiving tube to ensure that it is at a stable low level without illumination, that is, the signal modulation conversion circuit has to be placed nearby, which leads to the need to utilize more of the technical solution. Logic devices and analog devices make the circuit complex and costly to implement, and an increase in the number of devices may also cause an increase in the failure rate.
技术问题technical problem
本发明提供一种基于红外光敏的红外触摸屏的实现方法，其能在保证响应速度的情况下，简化电路，降低成本。  The invention provides an implementation method of an infrared photosensitive screen based on infrared light sensing, which can simplify the circuit and reduce the cost while ensuring the response speed.
技术解决方案Technical solution
一种基于红外光敏的红外触摸屏的实现方法，其中，基于红外光敏的红外触摸屏，其包括红外发射单元、红外接收单元、放大单元、电源及 MCU 处理器，所述的电源为所述的红外发射单元、红外接收单元提供电能；所述的红外接收单元包括接收选址单元及接收管阵列单元，所述的接收管阵列单元上设有红外光敏三极管，包括以下步骤：An infrared light-sensitive infrared touch screen implementation method, wherein the infrared light-sensitive infrared touch screen comprises an infrared emitting unit, an infrared receiving unit, an amplifying unit, a power source and an MCU a processor, wherein the power supply provides power to the infrared transmitting unit and the infrared receiving unit; the infrared receiving unit comprises a receiving and selecting unit and a receiving tube array unit, wherein the receiving tube array unit is provided with infrared light sensing Transistor, including the following steps:
通过所述的红外发射单元的进行红外线发射； Performing infrared ray emission through the infrared emitting unit;
通过所述的红外接收单元的红外光敏三极管接收所述的红外线，所述的红外接收单元接收到信号，通过所述的放大单元进行信号放大，送至所述的 MCU 处理器进行采样处理，所述的 MCU 处理器采用单脉冲采样方式进行采样处理； Receiving the infrared ray through an infrared phototransistor of the infrared receiving unit, the infrared receiving unit receives a signal, performs signal amplification by the amplifying unit, and sends the signal to the MCU The processor performs sampling processing, and the MCU processor performs sampling processing by using a single pulse sampling manner;
所述的 MCU 处理器控制所述的红外发射单元及所述的红外接收单元的时序。The MCU processor controls timing of the infrared transmitting unit and the infrared receiving unit.
上述的 MCU 处理器进行采样时，在所述的红外光敏三极管的信号到达稳态前进行采样。When the MCU processor described above performs sampling, sampling is performed before the signal of the infrared phototransistor reaches a steady state.
上述的红外发射单元在提高所述的红外发射管的发射功率后再进行红外线发射，即其使用较常规更高的功率进行发外线发射 。 The above-mentioned infrared emitting unit performs infrared ray emission after increasing the transmission power of the infrared transmitting tube, that is, it uses an ordinary higher power for transmitting an external line.
上述的 MCU 处理器，其采用自适应算法，对所述的红外光敏三极管的判别阀值进行算法修正。The above MCU processor uses an adaptive algorithm to algorithmically correct the discriminant threshold of the infrared phototransistor.
上述的接收管阵列单元采用矩阵式布局。The above-mentioned receiving tube array unit adopts a matrix layout.
上述的接收选址单元，包括对所述的接收管阵列单元中的行信号进行控制的控制电路模块及对所述的接收管阵列单元中的列信号进行选通的选通电路模块。The receiving and addressing unit includes a control circuit module for controlling a row signal in the receiving tube array unit and a gate circuit module for gating a column signal in the receiving tube array unit.
优选地，上述的控制电路模块为型号为 74XX138 的芯片。 Preferably, the above control circuit module is a chip of the type 74XX138.
优选地，上述的选通电路模块为型号为 74XX4051 的芯片。 Preferably, the gating circuit module described above is a chip of the type 74XX4051.
上述的放大单元采用一级到二级运放，且使用双电源运放芯片。 The above amplifying unit uses a primary to secondary operational amplifier and uses a dual power operational amplifier chip.
有益效果Beneficial effect
采用上述的技术方案后，本发明申请所公开的技术方案，其不需要解调电路，具有电路简单，且响应时间短的优点。大大降低了成本，也减少了硬件故障的概率。尤其是采用了单脉冲采集方式，采集速度也得到了提高，可以适应做多点对速度的要求。 After adopting the above technical solution, the technical solution disclosed in the application of the present invention does not require a demodulation circuit, and has the advantages of simple circuit and short response time. Significantly reduces costs and reduces the probability of hardware failure. In particular, the single-pulse acquisition method is adopted, and the acquisition speed is also improved, which can be adapted to the requirements of multi-point speed.
附图说明DRAWINGS
图 1 为本发明红外触摸屏的结构框图； 1 is a structural block diagram of an infrared touch screen of the present invention;
图 2 为本发明接收管阵列单元的示意图； 2 is a schematic view of a receiving tube array unit of the present invention;
图 3 为本发明接收选址单元的控制电路模块的示意图； 3 is a schematic diagram of a control circuit module for receiving a location unit according to the present invention;
图 4 为本发明接收选址单元的选通电路模块的示意图； 4 is a schematic diagram of a gating circuit module of a receiving address unit according to the present invention;
图 5 为本发明放大单元的电路示意图； Figure 5 is a circuit diagram of an amplifying unit of the present invention;
图 6 为本发明的处理流程图； Figure 6 is a process flow diagram of the present invention;
图 7 为本发明的定时器处理示意图； 7 is a schematic diagram of processing of a timer of the present invention;
图 8 为本发明的信号经放大单元后的波形图。 FIG. 8 is a waveform diagram of the signal of the present invention after being amplified by a unit.
本发明的最佳实施方式BEST MODE FOR CARRYING OUT THE INVENTION
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。 The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
本发明公开了一种基于红外光敏的红外触摸屏的实现方法，其中，参考图 1 所示，该基于红外光敏的红外触摸屏，包括、红外发射单元 1 、红外接收单元 2 、放大单元 3 、电源 4 及 MCU 处理器 5 ，其中： The invention discloses an implementation method of an infrared photosensitive screen based on infrared light sensing, wherein, referring to FIG. 1 As shown, the infrared light-sensitive infrared touch screen includes an infrared emitting unit 1, an infrared receiving unit 2, an amplifying unit 3, a power source 4, and an MCU processor 5, wherein:
电源 4 为、红外发射单元 1 、红外接收单元 2 提供电能； 整个系统从 PC 机的 USB 接口取电， USB 接口供电电压为 5V ，供电电流最大值为 500mA 。 红外发射单元 1 、红外接收单元 2 是 直接使用 5V 电源； MCU 处理器 5 使用 3.3V 电源，因此，使用 LDO 电路模块 6 将 USB 接口的 5V 电压转化为 3.3V ，以适应 MCU 处理器 5 芯片的需要。 The power supply 4 provides power to the infrared transmitting unit 1 and the infrared receiving unit 2; the entire system is USB from the PC The interface is powered, the USB interface supply voltage is 5V, and the maximum supply current is 500mA. Infrared transmitting unit 1 , infrared receiving unit 2 is directly used 5V power supply; MCU processor 5 Using a 3.3V power supply, therefore, using the LDO circuit module 6 converts the 5V voltage of the USB interface to 3.3V to accommodate the needs of the MCU processor 5 chip.
参考图 1 所示，红外发射单元 1 ，包括发射选址单元 11 及发射管阵列单元 12 ，发射管阵列单元 12 上设有发射管，在实施时， 红外发射单元 1 在提高红外发射管的发射功率后再进行红外线发射，即其 使用较常规更高的功率进行发外线发射 。 这样调整之后，整机耗电控制在 200~300mA ，而 USB 接口可以提供的最大电流是 500mA ，在可用的范围内。通过这种的提高红外发射管的发射功率来弥补方式，可以解决红外光敏三极管具有响应速度慢的缺点。 Referring to FIG. 1, the infrared emitting unit 1 includes a transmitting and selecting unit 11 and a transmitting tube array unit 12, and a transmitting tube array unit. The launch tube is provided on the 12th. In the implementation, the infrared emitting unit 1 performs the infrared emission after increasing the transmitting power of the infrared transmitting tube, that is, it uses the higher power than the conventional one to perform the external line emission. After this adjustment, the power consumption of the whole machine is controlled at 200~300mA, and the maximum current that the USB interface can provide is 500mA. , within the available range. By improving the transmission power of the infrared transmitting tube to compensate for the shortcoming, the infrared phototransistor has a short response speed.
MCU 处理器 5 用于控制红外发射单元 1 及红外接收单元 2 的时序；在具体实施时， MCU 处理器 5 选用型号为 STM32F103C8 的 32 位高性能处理器，运行所有的控制逻辑及数据处理算法。 MCU 处理器通过控制发射选址电路进而控制红外发射阵列的时序；同时 MCU 通过控制接收选址电路进而控制红外接收阵列的时序。接收信号至 MCU 采样处理， MCU 对所有灯管进行采样后，集中处理算点算法，算出触摸坐标，经过 USB 发给 PC 机。 The MCU processor 5 is used to control the timing of the infrared transmitting unit 1 and the infrared receiving unit 2; in specific implementation, the MCU Processor 5 uses a 32-bit high-performance processor model STM32F103C8 that runs all control logic and data processing algorithms. MCU The processor controls the timing of the infrared transmitting array by controlling the transmitting addressing circuit; and the MCU controls the timing of the infrared receiving array by controlling the receiving addressing circuit. Receive signal to MCU sample processing, MCU After sampling all the lamps, the arithmetic algorithm is processed centrally, and the touch coordinates are calculated and sent to the PC via USB.
红外接收单元 2 ，包括接收选址单元 21 及接收管阵列单元 22 ，接收管阵列单元 22 上设有红外光敏三极管。 The infrared receiving unit 2 includes a receiving and selecting unit 21 and a receiving tube array unit 22, and a receiving tube array unit 22 An infrared phototransistor is provided thereon.
在本实施例中，配合图 2 所示，接收管阵列单元 22 ，是采用矩阵式布局，根据触摸屏尺寸不同，可以采用 8X8 阵列或 8X12 阵列。这样布局的好处是控制线较少，例如 8X8 阵列只需要 16 个引脚就可以控制 64 个接收管的信号采集；控制也比较简单，例如第一行控制线置高，其他行控制线置低，然后选通第一列进行采集，采集到的就是图 2 中左上第一个接收管的信号。 In this embodiment, as shown in FIG. 2, the receiving tube array unit 22 adopts a matrix layout, and may be adopted according to the size of the touch screen. 8X8 array or 8X12 array. The advantage of this layout is that there are fewer control lines. For example, the 8X8 array only needs 16 pins to control 64. The signal acquisition of one receiving tube; the control is also relatively simple, for example, the first line of control line is set high, the other line control lines are set low, and then the first column is strobed for acquisition, and the first receiving tube in the upper left of Fig. 2 is collected. signal of.
本发明申请中的接收管阵列单元 22 ，与现有的光敏二极管的阵列相比，所需元器件减少，电路简单。 In the receiving tube array unit 22 of the present invention, compared with the existing array of photodiodes, the required components are reduced, and the circuit is simple.
配合图 3 、 4 所示，接收选址单元 21 ，包括对接收管阵列单元 22 中的行信号进行控制的控制电路模块及对接收管阵列单元 22 中的列信号进行选通的选通电路模块。 As shown in Figures 3 and 4, the receiving location unit 21 includes a pair of receiving tube array units 22 The control circuit module for controlling the row signal and the gate circuit module for gating the column signal in the receiving tube array unit 22.
如图 3 所示，控制电路模块是对接收管阵列单元 22 中的行信号进行控制。在本实施例中，其是采用了一片 74XX138 芯片，即 3-8 译码器，当译码器的地址输入（ A/B/C ）是 000 时，芯片 Y0 输出为低电平，其他 Y1-Y7 输出为高电平，这样使可以使能接收管阵列单元 22 的第一行。 As shown in FIG. 3, the control circuit module controls the line signals in the receiving tube array unit 22. In this embodiment, it uses a piece 74XX138 chip, ie 3-8 decoder, when the address input (A/B/C) of the decoder is 000, the output of chip Y0 is low, other Y1-Y7 The output is high so that the first row of the receive tube array unit 22 can be enabled.
如图 4 所示，选通电路模块，是对接收管阵列单元 22 中的列信号进行选通。在本实施例中，其是采用一片 74XX4051 ，即模拟选择器，当该芯片的地址选输入（ A/B/C ）输入为 000 时，第一路被选通，即 X0 引脚传输到 X 引脚。该信号经过放大单元（解调制单元）后，进入 MCU 单元进行采样。 As shown in FIG. 4, the gate circuit module gates the column signals in the receiver array unit 22. In this embodiment, it is a piece 74XX4051, the analog selector. When the address selection input (A/B/C) input of the chip is 000, the first channel is gated, that is, the X0 pin is transmitted to X. Pin. After the signal passes through the amplification unit (demodulation unit), it enters the MCU unit for sampling.
本发明申请中的接收选址单元 21 ，与现有的二极管采用模拟选择器，使用 9 片 74XX4051 芯片连接成 2 级电压选择电路相比，本发明申请的接收选址单元采样简单，避免象现有的二极管方案一样，需要用到相当多的 74XX4051 芯片。 The receiving and locating unit 21 in the application of the present invention uses an analog selector with the existing diode, and uses 9 pieces of 74XX4051. Compared with the two-stage voltage selection circuit, the receiving address unit of the present invention is simple to sample, and avoids the need for a considerable number of 74XX4051 chips as in the conventional diode scheme.
如图 5 所示，放大单元 3 ，采用一级到二级运放，且使用双电源运放芯片。在本实施例中，其是采用型号为 LM828 的芯片，该芯片为负电源芯片，为运放芯片提供负压。 As shown in Figure 5, the amplification unit 3 uses a primary to secondary op amp and uses a dual power op amp chip. In this embodiment, it is modeled as The chip of the LM828, which is a negative power chip, provides negative voltage for the op amp chip.
实施例一： Embodiment 1:
本发明是 一种基于红外光敏的红外触摸屏的实现方法，其采用上述公开的基于红外光敏的红外触摸屏，其包括以下步骤： The invention is An infrared light-sensitive infrared touch screen implementation method adopts the infrared light-sensitive infrared touch screen disclosed above, which comprises the following steps:
通过红外发射单元 1 的红外发射管进行红外线发射；且红外发射单元 1 使用较常规更高的功率进行发外线发射。 Infrared emission through the infrared transmitting tube of the infrared emitting unit 1; and the infrared emitting unit 1 The outgoing line is transmitted using a higher power than conventional.
通过红外接收单元 2 的红外光敏三极管接收红外线，红外接收单元 2 接收到信号，通过放大单元 3 进行信号放大，送至 MCU 处理器 5 进行采样处理， MCU 处理器 5 采用单脉冲采样方式进行采样处理；采用单脉冲的采样方式 . The infrared light is received by the infrared phototransistor of the infrared receiving unit 2, and the infrared receiving unit 2 receives the signal and passes through the amplifying unit 3 The signal is amplified and sent to the MCU processor 5 for sampling processing, and the MCU processor 5 uses a single pulse sampling method for sampling processing; a single pulse sampling method is adopted.
MCU 处理器 5 控制红外发射单元 1 及红外接收单元 2 的时序。 The MCU processor 5 controls the timing of the infrared transmitting unit 1 and the infrared receiving unit 2.
参考图 6 所示，系统在上电后， MCU 处理器 5 中的控制程序开始执行，控制程序先进行系统初始化，即配置发射选址单元 11 的控制引脚、接收选址单元 21 的控制引脚、 USB 接口和采集引脚；然后采集一组采样值做为基准值。 Referring to Figure 6, after powering up the system, the MCU processor 5 The control program in the middle begins to execute, and the control program first performs system initialization, that is, configures the control pin of the transmitting and addressing unit 11, the control pin of the receiving and addressing unit 21, and the USB. Interface and acquisition pins; then collect a set of sample values as a reference value.
之后进入常规扫描阶段，扫描过程是 MCU 控制发射选址单元进而控制发射管阵列逐个地发光，然后控制接收选址单元进而选通发射管阵列对应信号进行采样，直到所有的灯管完成采样，每个时刻只有一个发射管发光。一轮扫描完成后，会得到一包采样数据。然后执行点算法和跟踪算法，最后通过 USB 接口上报给计算机。 Then enter the regular scanning phase, the scanning process is MCU The transmitting and selecting location unit is controlled to control the transmitting tube array to emit light one by one, and then the receiving and selecting unit is controlled to strobe the corresponding signal of the transmitting tube array for sampling until all the lamps are sampled, and only one transmitting tube emits light at a time. After a round of scanning is completed, a packet of sampled data is obtained. Then perform the point algorithm and the tracking algorithm, and finally pass The USB interface is reported to the computer.
参考图 7 所示，发射管的定时采样一般都采用定时器中断实现。开始一轮采样，软件上即配置定时器中断，然后定时器中断会定间隔触摸采集程序，依次完成对每个接收管的信号采样。 Refer to Figure 7 As shown, the timing sampling of the transmit tube is typically implemented using a timer interrupt. After starting a round of sampling, the timer interrupt is configured on the software, and then the timer interrupts the interval to touch the acquisition program, and the signal sampling for each receiving tube is completed in turn.
参考图 8 所示，其为放大单元 3 的输出波形图。其采用单脉冲的采样方式，从图中可以看出，信号上升的较快，即使采集速度也得到了提高，可以适应做多点对速度的要求。 Referring to Figure 8, it is an amplifying unit 3 Output waveform diagram. It adopts single-pulse sampling mode. It can be seen from the figure that the signal rises faster, even if the acquisition speed is improved, it can adapt to the multi-point speed requirement.
另外，与现有方案相比，本发明的方案没有使用载波，去掉了载波解调制电路部分，大大降低了硬件成本。实施例二： In addition, compared with the prior art, the solution of the present invention does not use a carrier, and the part of the carrier demodulation circuit is removed, which greatly reduces the hardware cost. Embodiment 2:
与实施例一相比，其不同之处在于，其还包括以下步骤： Compared with the first embodiment, the difference is that it further comprises the following steps:
上述的 MCU 处理器 5 进行采样时，在红外接收单元 1 的红外光敏三极管的信号到达稳态前进行采样。 When the above MCU processor 5 is sampling, in the infrared receiving unit 1 The signal of the infrared phototransistor is sampled before reaching the steady state.
由于红外光敏三极管具有响应速度慢的缺点，主要表现在扫描时信号值上升变化过程较为缓慢，如果等待信号到达稳态时采样，则周期过慢，而每个红外触摸屏使用 300 多对红外对管（红外发射管和红外光敏三极管），一轮采集的总时间不能达到实时触摸控制的需求，而采用提前进行采样，可克服红外光敏三极管响应速度慢的缺点。 Because the infrared phototransistor has the disadvantage of slow response speed, it mainly shows that the signal value rises and changes slowly during scanning. If the sampling signal arrives at steady state, the cycle is too slow, and each infrared touch screen uses 300. Many pairs of infrared pair tubes (infrared emitting tubes and infrared phototransistors), the total time of one round of acquisition can not meet the needs of real-time touch control, and the use of early sampling can overcome the shortcomings of slow response of infrared phototransistors.
实施例三： Embodiment 3:
与实施例二相比，其不同之处在于，其还包括以下步骤： Compared with the second embodiment, the difference is that it also includes the following steps:
MCU 处理器 5 ，其采用自适应算法，对红外光敏三极管的判别阀值进行算法修正。 The MCU processor 5 uses an adaptive algorithm to algorithmically correct the discriminant threshold of the infrared phototransistor.
正常红外光敏三极管在到达稳态后进行采样，会比较准确，提前采样的话，从波形上看，电平还没到达稳态，是个中间过度的过程，阀值会有变化，因此，需要对采样的阀值进行调整，即，采样越小，电平上升的就越小，阀值也要设的更小。在本实施例中，通过 MCU 处理器 5 内部的自适应模块，对红外光敏三极管的判别阀值进行算法修正，以克服红外光敏三极管的信号到达稳态前进行采样的缺陷，经过测试，可以达到一致的速度。 Normal infrared phototransistor will be sampled after reaching steady state. It will be more accurate. If the sample is sampled in advance, the level has not reached the steady state. It is an intermediate process and the threshold will change. Therefore, the sampling needs to be performed. The threshold is adjusted, that is, the smaller the sample, the smaller the level rises and the smaller the threshold. In this embodiment, through MCU processor 5 The internal adaptive module performs algorithmic correction on the discriminating threshold of the infrared phototransistor to overcome the defect of sampling before the signal of the infrared phototransistor reaches the steady state, and after testing, a consistent speed can be achieved.
本发明申请所公开的技术方案，其不需要解调电路，具有电路简单，且响应时间短的优点。大大降低了成本，也减少了硬件故障的概率。尤其是采用了单脉冲采集方式，采集速度也得到了提高，可以适应做多点对速度的要求。 The technical solution disclosed in the application of the present invention does not require a demodulation circuit, and has the advantages of simple circuit and short response time. Significantly reduces costs and reduces the probability of hardware failure. In particular, the single-pulse acquisition method is adopted, and the acquisition speed is also improved, which can be adapted to the requirements of multi-point speed.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。 The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
本发明的实施方式Embodiments of the invention
工业实用性Industrial applicability
序列表自由内容Sequence table free content

Claims (9)

  1. 一种基于红外光敏的红外触摸屏的实现方法，其特征在于：基于红外光敏的红外触摸屏，其包括红外发射单元、红外接收单元、放大单元、电源及 MCU 处理器，所述的电源为所述的红外发射单元、红外接收单元提供电能；所述的红外接收单元包括接收选址单元及接收管阵列单元，所述的接收管阵列单元上设有红外光敏三极管，包括以下步骤：The invention discloses an infrared touch-sensitive infrared touch screen, which is characterized in that: an infrared light-sensitive infrared touch screen comprises an infrared emitting unit, an infrared receiving unit, an amplifying unit, a power source and MCU a processor, wherein the power supply provides power to the infrared transmitting unit and the infrared receiving unit; the infrared receiving unit comprises a receiving and selecting unit and a receiving tube array unit, wherein the receiving tube array unit is provided with infrared light sensing Transistor, including the following steps:
    通过所述的红外发射单元进行红外线发射；Performing infrared light emission through the infrared emitting unit;
    通过所述的红外接收单元的红外光敏三极管接收所述的红外线，所述的红外接收单元接收到信号，通过所述的放大单元进行信号放大，送至所述的 MCU 处理器进行采样处理，所述的 MCU 处理器采用单脉冲采样方式进行采样处理；Receiving, by the infrared phototransistor of the infrared receiving unit, the infrared ray, the infrared receiving unit receives a signal, and the signal is amplified by the amplifying unit, and sent to the The MCU processor performs sampling processing, and the MCU processor performs sampling processing by using a single pulse sampling method;
    所述的 MCU 处理器控制所述的红外发射单元及所述的红外接收单元的时序。The MCU processor controls timing of the infrared transmitting unit and the infrared receiving unit.
  2. 如权利要求 1 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的 MCU 处理器进行采样时，在所述的红外光敏三极管的信号到达稳态前进行采样。The method for implementing an infrared light-sensitive infrared touch screen according to claim 1, wherein: said MCU When the processor is sampling, sampling is performed before the signal of the infrared phototransistor reaches a steady state.
  3. 如权利要求 2 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的红外发射单元在提高所述的红外发射管的发射功率后再进行红外线发射。Claims 2 The method for implementing an infrared light-sensitive infrared touch screen is characterized in that: the infrared emitting unit performs infrared light emission after increasing the transmitting power of the infrared transmitting tube.
  4. 如权利要求 1 、 2 或 3 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的 MCU 处理器，其采用自适应算法，对所述的红外光敏三极管的判别阀值进行算法修正。The method for implementing an infrared light-sensitive infrared touch screen according to claim 1, 2 or 3, wherein the MCU is The processor uses an adaptive algorithm to algorithmically correct the discriminant threshold of the infrared phototransistor.
  5. 如权利要求 4 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的接收管阵列单元采用矩阵式布局。Claims 4 The implementation method of the infrared light-sensitive infrared touch screen is characterized in that: the receiving tube array unit adopts a matrix layout.
  6. 如权利要求 4 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的接收选址单元，包括对所述的接收管阵列单元中的行信号进行控制的控制电路模块及对所述的接收管阵列单元中的列信号进行选通的选通电路模块。Claims 4 The method for implementing an infrared light-sensitive infrared touch screen is characterized in that: the receiving and selecting unit comprises a control circuit module for controlling a row signal in the receiving tube array unit and receiving the receiving The gate signal in the tube array unit is gated by the gate circuit module.
  7. 如权利要求 6 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的控制电路模块为型号为 74XX138 的芯片。The method for implementing an infrared light-sensitive infrared touch screen according to claim 6, wherein the control circuit module is of the type 74XX138 Chip.
  8. 如权利要求 7 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的选通电路模块为型号为 74XX4051 的芯片。The method for implementing an infrared light-sensitive infrared touch screen according to claim 7, wherein the gate circuit module is of the type 74XX4051 Chip.
  9. 如权利要求 1 、 2 或 3 所述的基于红外光敏的红外触摸屏的实现方法，其特征在于：所述的放大单元采用一级到二级运放，且使用双电源运放芯片。According to claim 1, 2 or 3 The method for implementing an infrared light-sensitive infrared touch screen is characterized in that: the amplifying unit adopts a first-level to two-level operational amplifier, and uses a dual-power operational amplifier chip.
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