CN101893968A - Signal processing circuit of infrared touch screen - Google Patents

Signal processing circuit of infrared touch screen Download PDF

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Publication number
CN101893968A
CN101893968A CN2009100843355A CN200910084335A CN101893968A CN 101893968 A CN101893968 A CN 101893968A CN 2009100843355 A CN2009100843355 A CN 2009100843355A CN 200910084335 A CN200910084335 A CN 200910084335A CN 101893968 A CN101893968 A CN 101893968A
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China
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connected
signal processing
amplifier
circuit
touch screen
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CN2009100843355A
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Chinese (zh)
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刘建军
刘新斌
叶新林
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北京汇冠新技术股份有限公司;北京汇冠触摸技术有限公司
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Priority to CN2009100843355A priority Critical patent/CN101893968A/en
Publication of CN101893968A publication Critical patent/CN101893968A/en

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Abstract

The invention discloses a signal processing circuit of an infrared touch screen, which comprises a signal receiving circuit, a micro controller and a high-pass filter circuit, wherein the input end of the high-pass filter circuit is connected with the output end of the signal receiving circuit; the control end of the high-pass filter circuit is connected with the micro controller; and the output end of the high-pass filter circuit is connected with the micro controller. The signal processing circuit of an infrared touch screen has high anti-interference performance.

Description

一种红外触摸屏信号处理电路 Infrared touch screen signal processing circuit

技术领域 FIELD

[0001] 本发明涉及一种信号处理电路,尤其涉及一种应用于红外触摸屏上的信号处理电路。 [0001] The present invention relates to a signal processing circuit, and particularly to a signal processing circuit on the infrared touch screen.

背景技术 Background technique

[0002] 长期以来,触摸屏市场处于五彩纷呈的局面,采用不同技术的触摸屏适应了不同的应用环境,红外触摸技术只是其中的一种,有自身的优势和不足。 [0002] For a long time, touch-screen market situation in the colorful scene, using different technology, touch screen adapted to different applications, Infrared touch technology is only one of them, has its own advantages and disadvantages. 业内人士对红外触摸技术的优势极为钟情,对其不足之处也非常清楚,并做出了不懈的努力进行改进。 The industry is very in love with the advantages of infrared touch technology, its inadequacies are also very clear, and make unremitting efforts to improve it. 到目前为止,红外触摸技术已经进入第五代。 So far, infrared touch technology has entered the fifth generation. 从其表现出来的一些特性来看,极有可能从各种触摸技术之中脱颖而出,成为触摸屏市场的弄潮儿。 From some of the characteristics demonstrated by the term, it is likely to stand out from among a variety of touch technology, touch-screen market, beach-goers.

[0003] 处理电路是红外触摸屏的核心组成部分,现有处理电路的信号处理方案主要有以下几种:第一种方案为简单的对红外单脉冲信号进行滤波和放大;第二种方案为对单脉冲信号进行采样保持电路处理,提高了抵御环境光干扰的能力;第三种方案为对载波调制信号进行滤波和解调处理,相对于第二种方案有更强的抗噪声能力。 [0003] The processing circuit is a core part of the infrared touch screen, the signal processing circuit processing scheme prior are the following: The first embodiment is a simple single infrared pulse signals are filtered and amplified; for the second embodiment single pulse signal sample and hold circuit processing, improve the ability to withstand the ambient light; a third embodiment of the carrier modulated signal filtering and demodulation processing with respect to the second embodiment has a greater noise immunity. 虽然第二种方案和第三种方案都在信号调理上有很大的改善和优点,但是第二种方案需要类似仪表放大器的配合,第三种方案需要高速的运算放大器和D/A转换器,成本都相对较高。 Although the second embodiment and the third embodiment are greatly improved in the signal conditioning and advantages, but similar to the second scheme requires complex instrumentation amplifier, a third scheme requires a high-speed operational amplifier and D / A converter , costs are relatively high.

发明内容 SUMMARY

[0004] 针对现有技术中存在的问题,本发明提供了一种抗干扰性强的红外触摸屏信号处理电路,所述信号处理电路包括信号收取电路、微控制器,所述信号处理电路还包含有一个高通滤波电路,所述高通滤波电路的输入端与所述信号收取电路的输出端相连接,所述高通滤波电路的控制端与所述微控制器相连接,所述高通滤波电路的输出端与所述微控制器相连接。 [0004] For the problems in the prior art, the present invention provides a strong anti infrared touch screen signal processing circuit, the signal processing circuit comprises a signal charge circuit, a microcontroller, the signal processing circuit further comprises the output terminal of a high pass filter circuit, the input of the high pass filter circuit and the signal charge circuit, a control terminal of the high pass filter circuit is connected to the microcontroller, the output of the high pass filter circuit end is connected to the microcontroller.

[0005] 进一步的,所述高通滤波电路由一个电容和一个模拟开关构成,所述电容的输入端与所述信号收取电路的输出端相连接,所述电容的输出端与所述微控制器相连接,所述模拟开关的一端与所述电容和所述微控制器之间的电路节点相连接,所述模拟开关的另一端与参考电位相接,所述模拟开关的控制端与所述微控制器相连接。 [0005] Further, the high pass filter circuit is constituted by an analog switch and a capacitor, said capacitor output terminal coupled to said signal input circuit is connected to receive the output of the capacitor microcontroller connected to the analog switch circuit node between the capacitor and the one end of the microcontroller is connected to the other end of the analog switch is in contact with the reference potential, the control terminal of the analog switch and the The microcontroller is connected.

[0006] 更进一步的,所述参考电位为0V。 [0006] Further still, the reference potential is 0V.

[0007] 更进一步的,所述信号收取电路的输出端与所述电容的输入端之间串联有一个放大器。 [0007] Further still, an amplifier connected in series between the output terminal of the charge circuit and the signal input terminal capacitance.

[0008] 更进一步的,所述电容的输出端与所述微处理器之间串联有一个放大器和一个A/ D变换器,所述放大器的输入端与所述电容的输出端相连接,所述放大器的输出端与所述A/D变换器的输入端相连接,所述A/D变换器的输出端与所述微控制器相连接。 [0008] Further, the capacitor in series between the output terminal and the microprocessor has an amplifier and an A / D converter, the input of the amplifier connected to the output terminal and the capacitor, the the input terminal of said amplifier and the output of the a / D converter is connected to an output of the a / D converter is connected with the microcontroller.

[0009] 更进一步的,所述电容的输出端与所述微处理器之间串联有一个放大器和一个比较器,所述放大器的输入端与所述电容的输出端相连接,所述放大器的输出端与所述比较器的输入端相连接,所述比较器的输出端与所述微控制器相连接。 [0009] Still further, the output terminal of the capacitor connected in series between the microprocessor and an amplifier and a comparator, the amplifier input and the capacitor connected to the output of the amplifier output terminal and the input terminal of the comparator is connected to the comparator output terminal is connected to the microcontroller. [0010] 更进一步的,所述比较器为电压比较器。 [0010] Further still, the comparator is a voltage comparator.

[0011] 更进一步的,所述放大器为具有自动增益AGC功能的放大器。 [0011] Further still, the amplifier gain of the AGC amplifier having an automatic function.

[0012] 本发明所述的这种红外触摸屏处理电路包含有一个高通滤波电路,能够将环境光信号滤除,使得应用这种处理电路的红外屏具有优异的抗干扰性能。 [0012] Such infrared touch screen processing circuit according to the present invention comprises a high-pass filter circuit, the ambient light signal can be filtered, so that the infrared screen applications such processing circuits having an excellent anti-jamming performance. 本发明又提供了一种由一个电容和一个模拟开关构成的高通滤波电路,这种高通滤波电路结构简单、便于调整, 成本低廉。 The present invention also provides a high-pass filter circuit which consists of a capacitor and an analog switch configuration, the high pass filter circuit is simple in structure, easy to adjust, and low cost.

附图说明 BRIEF DESCRIPTION

[0013] 图1为红外触摸屏控制检测系统的一种实施例的结构图; [0013] FIG. 1 is a configuration diagram of an embodiment of a touch screen control Infrared detection system;

[0014] 图2为图1中高通滤波电路的一种实施例的结构图; [0014] FIG. 2 is a high-pass filter circuit of FIG. 1 a block diagram of an example of embodiment;

[0015] 图3为图2所示高通滤波电路的时序图; [0015] FIG. 3 is a timing chart of the high-pass filter circuit shown in FIG 2;

[0016] 图4为图2所示高通滤波电路的一种实施例的一种优化法案的结构图。 [0016] FIG. 4 is a high-pass filter circuit shown in FIG. 2 a configuration diagram of an optimized embodiment of the bill. 具体实施方式 Detailed ways

[0017] 下面结合说明书附图和具体实施方式对本发明作进一步的描述。 [0017] The following description in conjunction with the accompanying drawings and specific embodiments of the present invention will be further described.

[0018] 参照图1,为本发明所述的一种红外触摸屏控制检测系统的一种实施例,这种红外触摸屏控制检测系统包括信号收取电路101、红外发射管阵列102、红外接收管阵列103、微控制器104、驱动电流调节电路105、驱动电流放大电路106及驱动选择电路107,在该控制检测系统中还包含有一个高通滤波电路108,高通滤波电路108的输入端与信号收取电路101的输出端相连接,高通滤波电路108的控制端与微控制器104相连接,高通滤波电路108的输出端与微控制器104相连接。 [0018] Referring to FIG. 1 A touch screen control An infrared detection system of the embodiment of the infrared emission tube array 102, infrared receiver array 103 of the present invention, such an infrared touch screen control system comprises a signal charge detection circuit 101, , the microcontroller 104, the driving current adjustment circuit 105, the driving current amplifying circuit 106 and the driving selection circuit 107, the control detection system further comprises a high pass filter circuit 108, the input terminal and the signal of the high pass filter circuit 108 of the charge circuit 101 the output terminal is connected to a control terminal of the high pass filter circuit 108 is connected to the microcontroller 104, a high pass filter circuit 108 and the output terminal 104 is connected to the microcontroller. 其中,信号收取电路101、微控制器104及高通滤波电路108构成了该控制检测系统的本发明所述的信号处理电路。 Wherein the signal charge circuit 101, a microcontroller 104 and a high pass filter circuit 108 constitutes a signal processing circuit according to the present invention, the control system is detected. 由于此信号处理电路中包含有高通滤波电路,能够有效地将环境光信号滤除。 Since the signal processing circuit contains a high pass filter circuit, the ambient light can be effectively filtered signal. 应用这种信号处理电路的红外触摸屏具有良好的抗干扰性。 Application of such a signal processing circuit of the infrared touch screen having good resistance.

[0019] 参照图2,为图1中高通滤波电路的一种实施例,这种高通滤波电路108由一个电容201和一个模拟开关202构成,电容201的输入端与信号收取电路101的输出端相连接, 电容201的输出端与微控制器104相连接,模拟开关202的一端与电容201和微控制器104 之间的电路节点A相连接,模拟开关202的另一端接地(参考电位为0V),模拟开关202的控制端与微控制器104相连接。 [0019] Referring to FIG 2, is a high-pass filter circuit of FIG. 1 one embodiment, this high pass filter circuit 108 consists of a capacitor 201 and an analog switch 202 constitutes the output terminal capacitance of the input terminal and the signal 201 of the charge circuit 101 connected to the output terminal of the capacitor 201 is connected to microcontroller 104, analog switch circuit node a between the end 202 of the capacitor 201 and the microcontroller 104 is connected to other end of the analog switch 202 (the reference potential 0V ), the control terminal of the analog switch 202 is connected to microcontroller 104. 这种高通滤波电路仅由一个电容和一个模拟开关构成,结构简单,便于调整,生产成本低廉。 This high-pass filter circuit by only a capacitor and an analog switch configuration, simple in structure, easy to adjust, and low production cost. 参照图3,为图2所示高通滤波电路的时序图,在t0时刻, 接通电源,高通滤波电路中的模拟开关202闭合,由于开关内阻非常小,此时高通滤波电路的时间常数非常小,此时输入的环境光信号由于接近直流,所以被迅速过滤掉,输出被强制传导入大地;在tl时刻,模拟开关202断开,相当于电阻无限大,此时可以认为电路中只存在电容,相当于隔直电路,此时触摸屏开始发射信号,高通滤光电路送出的信号为滤掉环境光的信号;在t2时亥lj,电源断开。 Referring to FIG. 3, is a timing chart of the high-pass filter circuit shown in FIG. 2, at time t0, the power is turned on, the analog switch in the high-pass filter circuit 202 is closed, the switch resistance is very small, then the time constant of the high pass filter circuit is very small, the ambient light signal is input at this time due to the proximity of DC, it was quickly filtered, the output is forced to pass into the earth; at time tl, the analog switch 202 is turned off, corresponding to infinite resistance at this time that is only present in the circuit capacitors corresponding to the stopping circuit, when the touch screen to begin transmitting signals, high-pass filter circuit sends a signal to filter out ambient light signal; t2, Hai LJ disconnected, power supply. 图中UA为图2中电路节点A的采集电压,UB为图2中电路节点B的采集电压,电路节点B为信号收取电路与高通滤波电路相连接的电路节点。 FIG UA to acquire voltage circuit node A in FIG. 2, UB charge circuit and the circuit node is connected to a high pass filter circuit is a voltage acquisition circuit node B in FIG. 2, the circuit node B signals.

[0020] 参照图4,为图2所示的高通滤波电路的一种实施例的一种优化法案,在高通滤波电路108的电容201的输入端与信号收取电路101的输出端之间串联有一个具有自动增益AGC功能的放大器401,在电容201的输出端与微处理器104之间串联有一个具有自动增益 [0020] Referring to Figure 4, an optimized embodiment of the bill as a high-pass filter circuit shown in FIG. 2, receive the high pass filter circuit 108 and the input terminal of the capacitor 201 connected in series between the output signal of the circuit 101 an amplifier having automatic gain AGC function 401, the capacitor 201 between the output of a microprocessor 104 connected in series with automatic gain

4AGC功能的放大器402和一个A/D变换器403,放大器402的输入端与电容201的输出端相连接,放大器402的输出端与A/D变换器403的输入端相连接,A/D变换器403的输出端与微控制器104相连接。 4AGC a function of amplifier 402 and A / D converter 403, the amplifier input terminal and output terminal 402 of capacitor 201 is connected to the output terminal of the amplifier 402 and the A / D converter input terminal 403 is connected to A / D conversion output terminal 403 is connected to the microcontroller 104. 其中,A/D变换器也可以用电压比较器来代替。 Wherein, A / D converter may be replaced with a voltage comparator. 这种优化方案中的高通滤波电路加装了具有自动增益AGC功能的放大器及A/D变换器(或电压比较器),对传到信号进行了优化处理,使得微控制器能够更好的处理传输过来的信号,提高整个处理电路的检测精度。 Such optimization of the installation of the high-pass filter amplifier circuit and A / D converter (or a voltage comparator) with automatic gain AGC function of the spread signal is optimized, so that the microcontroller can be better treated transmitted by the signal detection accuracy in the entire processing circuit. 图4所示的高通滤波电路也可以只安装放大器401或只安装放大器402和A/D变换器403(或电压比较器),这两种结构的高通滤波电路比图4所示的高通滤波电路的处理效果差,但优于图2所示高通滤波电路的处理效果,适用于某些特殊的红外触摸屏。 High-pass filter circuit shown in FIG. 4 only amplifier 401 may be mounted or installed only amplifier 402 and A / D converter 403 (or a voltage comparator), a high pass filter circuit shown in both FIG. 4 configuration than the high-pass filter circuit the difference in treatment effect, shown in Figure 2 but better treatment effect of the high-pass filter circuit, in the special infrared touch screen. [0021] 本发明所述的方法并不限于具体实施方式中所述的实施例,例如,把具有自动增益AGC功能的放大器换成AGC电路与放大器的组合。 The method according to [0021] of the present invention is not limited to the specific embodiments described in the embodiment, for example, the gain of the AGC amplifier having an automatic function into the AGC circuit of the amplifier in combination. 本领域技术人员根据本发明的技术方案得出其他的实施方式,同样属于本发明的技术创新范围。 Those skilled in the art to obtain other embodiments According to the embodiment of the present invention, also belong to the scope of the technical innovation of the present invention.

Claims (9)

  1. 一种红外触摸屏信号处理电路,所述信号处理电路包括信号收取电路、微控制器,其特征在于:所述信号处理电路还包含有一个高通滤波电路,所述高通滤波电路的输入端与所述信号收取电路的输出端相连接,所述高通滤波电路的控制端与所述微控制器相连接,所述高通滤波电路的输出端与所述微控制器相连接。 Infrared touch screen signal processing circuit, the signal processing circuit comprises a signal charge circuit, a microcontroller, characterized in that: said signal processing circuit further comprises a high-pass filter circuit, the input terminal of the high pass filter circuit a signal output terminal connected to receive circuit, a control terminal of the high pass filter circuit is connected to the microcontroller, the output of the high pass filter circuit is connected with the microcontroller.
  2. 2.根据权利要求1所述的一种红外触摸屏信号处理电路,其特征在于:所述高通滤波电路由一个电容和一个模拟开关组成,所述电容的输入端与所述信号收取电路的输出端相连接,所述电容的输出端与所述微控制器相连接,所述模拟开关的一端与所述电容和所述微控制器之间的电路节点相连接,所述模拟开关的另一端与参考电位相接,所述模拟开关的控制端与所述微控制器相连接。 2. An infrared touch screen signal processing circuit according to claim 1, wherein: said high-pass filter circuit composed of a capacitor and an analog switch composed of the output of the input capacitance of the signal charge circuit connected to the output terminal of the capacitor is connected to the microcontroller, the analog circuit node between the switch and the one end of the capacitor is connected to the microcontroller, the analog switch and the other end phase reference potential, the control terminal of the analog switch connected to said microcontroller.
  3. 3.根据权利要求2所述的一种红外触摸屏信号处理电路,其特征在于:所述参考电位为0V。 An infrared touch screen signal processing circuit according to claim 2, wherein: said reference potential is 0V.
  4. 4.根据权利要求2所述的一种红外触摸屏信号处理电路,其特征在于:所述信号收取电路的输出端与所述电容的输入端之间串联有一个放大器。 4. An infrared touch screen signal processing circuit according to claim 2, wherein: an amplifier connected in series between the output terminal of the charge circuit and the signal input terminal capacitance.
  5. 5.根据权利要求2至4之一所述的一种红外触摸屏信号处理电路,其特征在于:所述电容的输出端与所述微处理器之间串联有一个放大器和一个A/D变换器,所述放大器的输入端与所述电容的输出端相连接,所述放大器的输出端与所述A/D变换器的输入端相连接,所述A/D变换器的输出端与所述微控制器相连接。 An infrared touch screen signal processing circuit 2 according to one of claim 4, wherein: an amplifier connected in series and an A / D converter of the capacitance between the output terminal and the microprocessor , the output terminal of the amplifier input and the capacitor is connected to the input terminal of the amplifier and the output of the a / D converter is connected to the a / D converter output terminal of the The microcontroller is connected.
  6. 6.根据权利要求2至4之一所述的一种红外触摸屏信号处理电路,其特征在于:所述电容的输出端与所述微处理器之间串联有一个放大器和一个比较器,所述放大器的输入端与所述电容的输出端相连接,所述放大器的输出端与所述比较器的输入端相连接,所述比较器的输出端与所述微控制器相连接。 An infrared touch screen signal processing circuit 2 according to one of claim 4, wherein: an amplifier connected in series between a comparator and the output of the capacitor with the microprocessor, the input of the amplifier is connected to the output terminal of said capacitor, said amplifier output terminal and the input terminal of the comparator is connected to the comparator output terminal is connected to the microcontroller.
  7. 7.根据权利要求6所述的一种红外触摸屏信号处理电路,其特征在于:所述比较器为电压比较器。 An infrared touch screen signal processing circuit according to claim 6, wherein: said comparator is a voltage comparator.
  8. 8.根据权利要求5所述的一种红外触摸屏信号处理电路,其特征在于:所述放大器为具有自动增益AGC功能的放大器。 8. The Infrared touch screen signal processing circuit according to claim 5, wherein: said amplifier is an amplifier with automatic gain AGC function.
  9. 9.根据权利要求7所述的一种红外触摸屏信号处理电路,其特征在于:所述放大器为具有自动增益AGC功能的放大器。 9. An infrared touch screen signal processing circuit according to claim 7, wherein: said amplifier is an amplifier with automatic gain AGC function.
CN2009100843355A 2009-05-21 2009-05-21 Signal processing circuit of infrared touch screen CN101893968A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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WO2014121501A1 (en) * 2013-02-07 2014-08-14 深圳富创通科技有限公司 Method for implementing infrared touch screen based on infrared optical sensor
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CN105988644A (en) * 2015-03-05 2016-10-05 上海品奇数码科技有限公司 Infrared touch screen circuit suitable for strong ambient light
CN105988644B (en) * 2015-03-05 2019-04-05 上海品奇数码科技有限公司 A kind of infrared touch panel circuit suitable for strong environment light

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