可扩展抗强光红外触控模块设计与实现
发布时间：2019-03-25 11:58
【摘要】：随着信息技术的发展，人们需要更便捷的方式与智能设备进行交互，触摸屏技术作为人机交互设备的一种得到了蓬勃的发展。 红外触摸屏不需要在显示屏上附加薄膜，因而透过率100%，并且拥有不易受电磁场，静电干扰的优点，，所以适用于环境恶劣的工作场合。但是红外触摸屏依赖红外光作为工作媒介，而红外波段在太阳光的能量分布中约占50％，太阳光将干扰红外触摸屏的正常工作。 针对上述缺点，本文对红外触摸屏的工作原理和设计实现进行深入研究，首先研究适用于室内光环境的红外触摸屏，在此基础上，研究能够在高空强环境光下工作的红外触摸屏，提出并行触摸扫描，选频接收的可扩展，抗强光红外触控模块，根据选频接收方式不同，又分别研究无源晶体谐振器选频接收和数字互相关锁相放大选频接收两个方案。 首先研究适用于室内光环境的红外触摸屏的工作原理和设计实现，测试分析其在环境光变化时的工作性能。方案的特点是：由ARM7控制一一对应的165对红外发射二极管和光电三极管顺序的点亮和数据接收，在ARM7的接收数据处理中使用动态阈值的方式使红外触摸屏能在室内370lux光强环境下正常工作。 然后研究无源晶体谐振器选频接收的并行扫描红外触摸屏的工作原理和设计实现，测试分析其抗强光性能。方案的特点是：使用C8051F930将接收数据的量化和数据处理集成到一个芯片上，将整个红外触摸屏分割为一系列独立工作的扫描单元，整个红外触摸屏的顺序扫描改变为各个扫描单元的并行扫描；扫描单元使用扩展UART通信协议与主控模块通信；使用光电二极管作为光电转换器件避免接收信号的饱和；利用无源晶体谐振器的逆压电——压电效应构成窄带滤波实现选频接收。实验证明该方案能够在环境光强45Klux下正常工作。 最后，基于适用于室内光环境的红外触摸屏研究中提出的触摸坐标产生方法，无源晶体谐振器选频接收并行扫描红外触摸屏研究中提出的扩展UART协议实现并行扫描和模块扩展的方法，研究使用互相关锁相放大选频接收的可扩展、抗强光红外触控模块的工作原理和设计实现，测试分析其抗强光性能。方案的特点是：使用PSOC5可编程片上系统芯片实现数字互相关锁相放大，提高集成度并且实现灵活配置对不同频率信号的选频接收；改进光电二极管的光电转换电路，使用多电压域的方式提高饱和电压限值。实验证明该方案能在环境光强100Klux下正常工作。
[Abstract]:With the development of information technology, people need more convenient way to interact with intelligent devices. As a kind of human-computer interaction device, touch screen technology has been developed vigorously. The infrared touch screen does not need to add film to the display screen, so it has 100% transmittance, and has the advantages of not being disturbed by electromagnetic field and static electricity, so it is suitable for work in harsh environment. But the infrared touch screen relies on infrared light as the working medium, and the infrared wave band accounts for about 50% of the energy distribution of the sun light, which will interfere with the normal operation of the infrared touch screen. In view of the shortcomings mentioned above, the working principle and design realization of infrared touch screen are deeply studied in this paper. Firstly, the infrared touch screen suitable for indoor light environment is studied, and on this basis, The infrared touch screen which can work in high altitude strong ambient light is studied, and the parallel touch scanning, expandable frequency selection receiving module and anti-strong light infrared touch control module are put forward, according to the different receiving mode of frequency selection, The frequency-selective reception schemes of passive crystal resonator and digital cross-correlation phase-locked amplifier are studied respectively. Firstly, the working principle and design implementation of infrared touch screen suitable for indoor light environment are studied, and the performance of infrared touch screen is tested and analyzed when the ambient light changes. The scheme is characterized by ARM7-controlled one-to-one lighting and data reception of 165pairs of infrared emitting diodes and photodiodes in sequence, In the receiving data processing of ARM7, the infrared touch screen can work normally in the indoor 370lux light intensity environment by using the dynamic threshold method. Then the principle and design of parallel scanning infrared touch screen for frequency selection and reception of passive crystal resonator are studied, and its anti-strong light performance is tested and analyzed. The characteristic of the scheme is that the quantization and processing of received data are integrated into a single chip using C8051F930, and the whole infrared touch screen is divided into a series of independent scanning units. The sequential scanning of the whole infrared touch screen is changed to the parallel scanning of each scanning unit. The scanning unit uses the extended UART communication protocol to communicate with the main control module, and uses the photodiode as the photoelectric conversion device to avoid the saturation of the received signal. Using the inverse piezoelectric-piezoelectric effect of passive crystal resonator, narrow band filter is used to realize frequency selective reception. The experimental results show that the scheme can work normally under ambient light intensity 45Klux. Finally, based on the touch coordinate generation method proposed in the research of infrared touch screen suitable for indoor light environment, In the research of passive crystal resonator frequency selective reception parallel scanning infrared touch screen, an extended UART protocol is proposed to realize parallel scanning and module extension, and the extensibility of general election frequency receiving using cross-correlation phase-locked amplifier is studied. The working principle and design implementation of the anti-strong light infrared touch module are introduced, and its anti-strong light performance is tested and analyzed. The characteristics of the scheme are as follows: the system chip on PSOC5 programmable chip is used to realize digital cross-correlation phase-locked amplification, to improve the integration degree and to realize the flexible configuration of frequency selection and reception of different frequency signals; The photoelectric conversion circuit of photodiode is improved, and the saturation voltage limit is increased by using multi-voltage domain. The experimental results show that the scheme can work normally under ambient light intensity 100Klux.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP334.3;TN219
本文编号：2446952
[Abstract]:With the development of information technology, people need more convenient way to interact with intelligent devices. As a kind of human-computer interaction device, touch screen technology has been developed vigorously. The infrared touch screen does not need to add film to the display screen, so it has 100% transmittance, and has the advantages of not being disturbed by electromagnetic field and static electricity, so it is suitable for work in harsh environment. But the infrared touch screen relies on infrared light as the working medium, and the infrared wave band accounts for about 50% of the energy distribution of the sun light, which will interfere with the normal operation of the infrared touch screen. In view of the shortcomings mentioned above, the working principle and design realization of infrared touch screen are deeply studied in this paper. Firstly, the infrared touch screen suitable for indoor light environment is studied, and on this basis, The infrared touch screen which can work in high altitude strong ambient light is studied, and the parallel touch scanning, expandable frequency selection receiving module and anti-strong light infrared touch control module are put forward, according to the different receiving mode of frequency selection, The frequency-selective reception schemes of passive crystal resonator and digital cross-correlation phase-locked amplifier are studied respectively. Firstly, the working principle and design implementation of infrared touch screen suitable for indoor light environment are studied, and the performance of infrared touch screen is tested and analyzed when the ambient light changes. The scheme is characterized by ARM7-controlled one-to-one lighting and data reception of 165pairs of infrared emitting diodes and photodiodes in sequence, In the receiving data processing of ARM7, the infrared touch screen can work normally in the indoor 370lux light intensity environment by using the dynamic threshold method. Then the principle and design of parallel scanning infrared touch screen for frequency selection and reception of passive crystal resonator are studied, and its anti-strong light performance is tested and analyzed. The characteristic of the scheme is that the quantization and processing of received data are integrated into a single chip using C8051F930, and the whole infrared touch screen is divided into a series of independent scanning units. The sequential scanning of the whole infrared touch screen is changed to the parallel scanning of each scanning unit. The scanning unit uses the extended UART communication protocol to communicate with the main control module, and uses the photodiode as the photoelectric conversion device to avoid the saturation of the received signal. Using the inverse piezoelectric-piezoelectric effect of passive crystal resonator, narrow band filter is used to realize frequency selective reception. The experimental results show that the scheme can work normally under ambient light intensity 45Klux. Finally, based on the touch coordinate generation method proposed in the research of infrared touch screen suitable for indoor light environment, In the research of passive crystal resonator frequency selective reception parallel scanning infrared touch screen, an extended UART protocol is proposed to realize parallel scanning and module extension, and the extensibility of general election frequency receiving using cross-correlation phase-locked amplifier is studied. The working principle and design implementation of the anti-strong light infrared touch module are introduced, and its anti-strong light performance is tested and analyzed. The characteristics of the scheme are as follows: the system chip on PSOC5 programmable chip is used to realize digital cross-correlation phase-locked amplification, to improve the integration degree and to realize the flexible configuration of frequency selection and reception of different frequency signals; The photoelectric conversion circuit of photodiode is improved, and the saturation voltage limit is increased by using multi-voltage domain. The experimental results show that the scheme can work normally under ambient light intensity 100Klux.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP334.3;TN219
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