本文關(guān)鍵詞： 紅外觸摸屏 并行掃描 抗強光 紅外解調(diào)器　出處：《電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著計算機技術(shù)的不斷發(fā)展,人們對信息技術(shù)的要求也越來越高,其中快捷方便地與智能設(shè)備的信息交互也受到人們的廣泛關(guān)注。觸摸技術(shù)脫離了傳統(tǒng)的鼠標(biāo)、鍵盤等輸入設(shè)備,體現(xiàn)現(xiàn)代計算機技術(shù)的智能化和人性化的特點。紅外觸摸屏在清晰度,精確定位,穩(wěn)定性等方面具有很大優(yōu)勢,但紅外觸摸屏仍具有以下四個重要難題:外界光干擾、觸摸檢測精度、系統(tǒng)響應(yīng)時間以及多點觸摸檢測。本論文針對上述問題進行如下研究:首先根據(jù)紅外觸摸屏觸摸精度不高的原因,研究紅外觸摸屏提高觸摸精度的方法。研究中通過加入觸摸點邊界的檢測進行觸摸位置的修正,從而實現(xiàn)觸摸屏檢測精度的提高。針對紅外觸摸屏多觸點問題,采用觸摸記錄和投影的方法,找出觸摸點相對位置,實現(xiàn)偽點的剔除。并根據(jù)紅外觸摸屏工作原理,設(shè)計了適用于室內(nèi)環(huán)境下高精度、多觸點功能的紅外觸摸屏。然后根據(jù)智能百葉窗的實現(xiàn)原理和觸控模塊的設(shè)計要求,選擇紅外解調(diào)器作為紅外信號接收器。通過研究紅外解調(diào)器的抗強光能力和掃描速度,得出解調(diào)器抗強光能力良好但掃描速度慢的結(jié)論。根據(jù)觸摸模塊精度要求和解調(diào)器掃描速度慢的特點,提出了一種間隔的方式避開管間串?dāng)_,實現(xiàn)并行掃描以提高掃描速度的方法,并對該方法中需避開串?dāng)_的通道數(shù)進行了推導(dǎo)和論證。接下來給出了觸控模塊的設(shè)計方案,并對方案中的硬件和程序進行設(shè)計,實現(xiàn)模塊可拼接、可批量生產(chǎn)的功能,最后對觸控模塊性能進行驗證。最后針對紅外觸摸屏抗強光能力弱的特點,選擇無源晶振濾波器作為選頻電路濾除強光干擾的方案。對晶振的頻率特性進行研究,設(shè)計無源晶振抗強光單元,并對單元進行強光測試和掃描速度進行測試。根據(jù)無源晶振單元抗強光能力強而掃描速度慢的問題,提出一種基于多種頻率的無源晶振并行掃描方式抗強光模塊方案。方案中使用8個不同頻率的無源晶振分別作為并行掃描抗強光模塊中紅外發(fā)射管的信號源和紅外接收電路的選頻器,實現(xiàn)了8個掃描單元同時工作。保留了無源晶振單元的抗強光能力,解決相鄰8個紅外發(fā)射管同時工作而產(chǎn)生的串?dāng)_問題,從而提高紅外管的平均掃描速度。并通過實驗對模塊抗強光干擾能力和濾除管間串?dāng)_能力進行驗證。
[Abstract]:With the development of computer technology, people are demanding more and more information technology, among which the information interaction with intelligent devices is paid more and more attention. Touch technology is away from the traditional mouse. Keyboard and other input devices reflect the intelligent and humanized characteristics of modern computer technology. Infrared touch screen has great advantages in definition, precise positioning, stability and so on. However, the infrared touch screen still has the following four important problems: external light interference, touch detection accuracy. The system response time and multi-touch detection. In this paper, the above problems are studied as follows: firstly, according to the reason that the touch accuracy of infrared touch screen is not high. The method of improving touch accuracy by infrared touch screen is studied. The touch position is modified by adding touch point boundary detection, so as to improve the precision of touch screen detection. Aiming at the multi-contact problem of infrared touch screen. By using the method of touch recording and projection, the relative position of touch point is found, and the pseudo point is eliminated. According to the working principle of infrared touch screen, high precision is designed for indoor environment. The infrared touch screen with multi-contact function. Then according to the realization principle of the intelligent shutter and the design requirements of the touch module. The infrared demodulator is selected as the infrared signal receiver. The anti-glare ability and scanning speed of the infrared demodulator are studied. According to the precision requirement of touch module and the characteristic of slow scan speed of demodulator, a way to avoid crosstalk between tubes is proposed. The method to realize parallel scanning to improve the scanning speed, and the number of channels to avoid crosstalk in this method is deduced and demonstrated. Then, the design scheme of touch control module is given. The hardware and program of the scheme are designed to realize the function of module splicing and batch production. Finally, the performance of touch module is verified. Finally, the characteristics of infrared touch screen with weak anti-glare ability are pointed out. The passive crystal oscillator filter is chosen as the scheme to filter the strong light interference in the frequency selective circuit. The frequency characteristic of the crystal oscillator is studied and the passive crystal oscillator anti-strong light unit is designed. According to the problem that the passive crystal oscillator unit has strong anti-glare ability and slow scanning speed. A parallel scanning scheme of passive crystal oscillator based on multiple frequencies is proposed, in which eight different frequencies of passive crystal oscillator are used as the signal source and red source of infrared emitter respectively. A frequency selector for an external receiving circuit. Eight scanning units are realized to work simultaneously, and the passive crystal oscillator unit has the ability to resist strong light, which solves the crosstalk problem caused by 8 adjacent infrared emitters working at the same time. In order to improve the average scanning speed of the infrared tube, the ability of resisting the strong light interference and filtering the crosstalk between the tubes is verified by experiments.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN219;TN873

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：1490778