TWI416391B - Infrared type handwriting input apparatus and scanning method - Google Patents
Infrared type handwriting input apparatus and scanning method Download PDFInfo
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Abstract
Description
本發明是有關於一種輸入裝置及位置掃描方法，特別是有關於一種低成本的紅外線輸入裝置及位置掃描方法。 The present invention relates to an input device and a position scanning method, and more particularly to a low-cost infrared input device and a position scanning method.
藉由觸控方式輸入指令或資訊的裝置例如具觸控功能的顯示螢幕，可於觸控有效的感測距離內精確定位觸控點位置。偵測顯示螢幕上觸控點位置的方法有許多種，其中一種是將光發射模組與光感測模組同時置於觸控屏幕角落，光發射模組發射光束，當所發射之光束打到指標物(使用者手指、筆或其他物體)，使得其中部分光束反射回到光感測模組的部份感測元件，利用光感測模組的感測元件感測到指標物觸控點反射光束之位置決定出指標物觸控點相對應之角度。藉由指標物觸控點與光感測模組的角度利用三角幾何原理可計算出觸控點位置座標。此偵測觸控點位置的方法的優點是在僅使用少量元件的條件下，即可達成足夠解析度的精確度。不過此種偵測觸控點位置的方法，是以掃描全部光感測元件的方式進行光感應訊號變化的偵測，但由於觸控點的移動通常為連續而非距離較大的跳躍移動，因此重複不斷針對所有光感測元 件進行掃描並非有效率之掃描方式，同時也會拖慢觸控反應速度。 A device that inputs commands or information by touch, such as a display screen with a touch function, can accurately position the touch point within the effective sensing distance of the touch. There are many ways to detect the position of the touch point on the screen. One of them is to place the light emitting module and the light sensing module at the corner of the touch screen at the same time. The light emitting module emits a beam, and when the emitted beam hits To the indicator object (user's finger, pen or other object), such that part of the light beam is reflected back to a part of the sensing component of the light sensing module, and the sensing component of the light sensing module senses the indicator touch The position of the point reflected beam determines the corresponding angle of the indicator touch point. The position coordinates of the touch point can be calculated by using the triangular geometry principle by the angles of the indicator touch point and the light sensing module. The advantage of this method of detecting the position of the touch point is that sufficient resolution accuracy can be achieved with only a small number of components. However, the method for detecting the position of the touch point is to detect the change of the light sensing signal by scanning all the light sensing elements, but since the movement of the touch point is usually a continuous movement rather than a large distance, Therefore, it is repeated for all light sensing elements. Scanning is not an efficient way to scan, but it also slows down the touch response.
另一種偵測觸控點位置的方法是將光發射模組與光感測模組分別置於相對的位置，並利用例如使用者手指或筆於觸控點對光束的阻斷來判斷偵測使用者手指觸控點位置。此種偵測觸控點位置技術可用於大尺寸感測區域的裝置，但其解析度取決於光發射模組與光感測模組的數量而定。美國專利US 3764813、US 4928094、US 5162783及US 6677934揭露現有習知的紅外線發光二極體(LED)式輸入技術及輸入裝置，這些專利揭露的輸入裝置將紅外線發光二極體即發射端置於感測區域的一邊，將光感測器即接收端置於感測區域的相對另一邊，以利用使用者手指或筆於觸控點對直線行進的光束的阻斷來判斷偵測使用者手指觸控點位置。如上述此種觸控輸入技術的解析度取決於光發射模組與光感測模組的數量，為了具備一定的解析度並完整涵蓋觸控感測區域，感測區域四邊必須密集配置光發射器與光感測器，如此不但增加了零件的數量，也增加了產品組裝的困難度及成本。越高的解析度要求必須使用越多的光發射模組與光感測模組，如此將提高成本且使得訊號處理變得更加複雜。 Another method for detecting the position of the touch point is to place the light emitting module and the light sensing module in opposite positions, and use a finger or a pen to block the light at the touch point to determine the detection. User finger touch point location. Such a technique for detecting touch point position can be used for a device of a large-sized sensing area, but the resolution depends on the number of light-emitting modules and light-sensing modules. U.S. Patent Nos. 3,764, 813, 4,928, 094, 5, 162, 783, and 6,677, 934 disclose prior art infrared light-emitting diode (LED) input technology and input devices. The disclosed input devices place an infrared light-emitting diode, that is, a transmitting end. One side of the sensing area is disposed on the opposite side of the sensing area, and the user's finger or pen is used to block the light beam traveling at the touch point to determine the user's finger. Touch point location. The resolution of the touch input technology as described above depends on the number of light emitting modules and light sensing modules. In order to have a certain resolution and completely cover the touch sensing area, the light emitting must be densely arranged on all four sides of the sensing area. And the light sensor, which not only increases the number of parts, but also increases the difficulty and cost of product assembly. Higher resolution requires more light-emitting modules and light-sensing modules to be used, which increases cost and complicates signal processing.
鑑於上述傳統輸入裝置及位置掃描方法的缺點，本發明提出一種紅外線輸入裝置及位置掃描方法，以減少零件數量降低成本。 In view of the above disadvantages of the conventional input device and the position scanning method, the present invention provides an infrared input device and a position scanning method to reduce the number of parts and reduce the cost.
本發明的目的在於提出一種輸入裝置及位置掃描方法，將光發射器與光感測器配置於感測區域的一側，以減少零件數量降低成本。 An object of the present invention is to provide an input device and a position scanning method, in which a light emitter and a light sensor are disposed on one side of a sensing area to reduce the number of parts and reduce the cost.
根據上述的目的，本發明提出一種輸入裝置，此輸入裝置包含複數個光發射器與複數個光感測器皆位於該輸入裝置之感測區域同一側、一控制元件與一訊號處理元件。控制元件控制光發射器發射光束並控制光感測器接收反射自感測區域內一指標物的光束。訊號處理元件處理光感測器產生之光感應訊號，並將處理後之光感應訊號傳送至控制元件。 In accordance with the above objects, the present invention provides an input device comprising a plurality of light emitters and a plurality of light sensors on the same side of the sensing region of the input device, a control element and a signal processing component. The control element controls the light emitter to emit a beam of light and controls the light sensor to receive a beam of light reflected from an indicator in the sensing region. The signal processing component processes the photo-sensing signal generated by the photo sensor and transmits the processed photo-sensing signal to the control component.
根據上述的目的，本發明提出一種輸入裝置之位置掃描方法，此輸入裝置包含一控制元件及複數個光發射器與複數個光感測器位於輸入裝置之感測區域的同一側，控制元件控制光發射器發射光束並控制光感測器接收反射自感測區域內一指標物的光束。此輸入裝置之位置掃描方法包含以下步驟。首先該控制元件控制一該光發射器發出光束進入該感測區域內。接著控制元件依序開啟所有光感測器以接收反射自指標物之光束。重複上述步驟直到所有該光發射器均已發出光束。比較光感測器接收之光感應訊號強度值，以決定指標物位於感測區域內Y軸方向的大約位置。然後控制元件控制位於光感應訊號強度最強區域之至少一光發射器發出光束。接著控制元件開啟光感測器以接收反射自該指標物之光束。然後比較光感測器接收之光感應訊號強度值，以決定指標物位於感測區域內Y軸座標。最後利用指標物之Y軸座標、與指標物之Y軸座標距離最近之二相鄰光感測器之間的距離計算指標物之X軸座標。 According to the above object, the present invention provides a position scanning method for an input device, the input device comprising a control element and a plurality of light emitters and a plurality of light sensors on the same side of the sensing area of the input device, the control element is controlled The light emitter emits a beam of light and controls the light sensor to receive a beam of light reflected from an indicator in the sensing region. The position scanning method of the input device includes the following steps. First, the control element controls a light emitter to emit light into the sensing region. The control element then turns on all of the light sensors in sequence to receive the light beam reflected from the indicator. Repeat the above steps until all of the light emitters have emitted a beam of light. Comparing the light sensing signal intensity values received by the light sensor to determine the approximate position of the indicator in the Y-axis direction of the sensing region. The control element then controls at least one of the light emitters located in the region where the intensity of the optically inductive signal is strong to emit a light beam. The control element then turns on the light sensor to receive the light beam reflected from the indicator. Then, the light sensing signal intensity value received by the light sensor is compared to determine the Y axis coordinate of the indicator in the sensing area. Finally, the X-axis coordinate of the index is calculated by using the distance between the Y-axis coordinate of the indicator and the two adjacent photosensors closest to the Y-axis coordinate of the indicator.
101‧‧‧感測區域 101‧‧‧Sensing area
102‧‧‧控制元件 102‧‧‧Control elements
104‧‧‧訊號處理元件 104‧‧‧Signal Processing Components
106‧‧‧多工器 106‧‧‧Multiplexer
108‧‧‧多工器 108‧‧‧Multiplexer
110‧‧‧光發射器 110‧‧‧Light emitter
112‧‧‧光感測器 112‧‧‧Light sensor
第一圖顯示本發明一實施例之輸入裝置的基本概念示意圖。 The first figure shows a basic conceptual diagram of an input device according to an embodiment of the present invention.
第二圖顯示本發明一實施例之輸入裝置訊號發射及接收的示意圖。 The second figure shows a schematic diagram of signal transmission and reception of an input device according to an embodiment of the invention.
第三圖顯示本發明一實施例之指標物位置座標計算方式。 The third figure shows the calculation method of the position coordinates of the indicator object according to an embodiment of the present invention.
本發明的一些實施例將詳細描述如下。然而，除了如下描述外，本發明還可以廣泛地在其他的實施例施行，且本發明的範圍並不受實施例之限定，其以之後的專利範圍為準。再者，為提供更清楚的描述及更易理解本發明，圖式內各部分並沒有依照其相對尺寸繪圖，某些尺寸與其他相關尺度相比已經被誇張；不相關之細節部分也未完全繪出，以求圖式的簡潔。 Some embodiments of the invention are described in detail below. However, the present invention may be widely practiced in other embodiments than the following description, and the scope of the present invention is not limited by the examples, which are subject to the scope of the following patents. Further, in order to provide a clearer description and a better understanding of the present invention, the various parts of the drawings are not drawn according to their relative dimensions, and some dimensions have been exaggerated compared to other related dimensions; the irrelevant details are not fully drawn. Out, in order to make the schema simple.
第一圖顯示本發明一實施例之輸入裝置的基本概念示意圖。感測區域101內一指標物(indicator)例如使用者的手指或筆(stylus)的位置係由位於感測區域101的一側的光發射器110發射光束射入感測區域101內，當光線射向指標物例如使用者的手指或筆的光束則被阻斷並反射回光感測器112，並可使最鄰近的光感測器112產生強度最高的光感應訊號，未被指標物阻斷的光束則因未被反射，光感測器112不會產生光感應訊號或僅產生微弱光感應訊號，而特定角度的光感測器112則因光束已被指標物反射並產生強度最高的光感應訊號，經訊號處理元件104處理後藉此可得出一完整的訊號強度分佈曲線，將訊號分佈曲線的結果與演算法作結合之後，就可計算出指標物觸控點位置座標。也就是說，根據光感應訊號變化以及演算法的計算，可推算出指標物位於感測區域101內的位置。光發射器110與光感測器112的位置及 排列方式以交互穿插排列的方式較佳，但不限於此。光發射器110為線型排列，每一光發射器110係由一控制元件102透過一多工器106之開關控制。每一光感測器112亦為線型排列，由一控制元件102透過一多工器108之開關控制開啟。控制元件102包含一微控制器(Micro-controller Unit，MCU)，但不限於微控制器。光發射器110包含紅外線發光二極體(LED)，但不限於紅外線發光二極體。光感測器112包含電荷耦合元件(CCD Senosr)或互補式金氧半導體等具有光電效應的元件(CMOS Senosr)，但不限於電荷耦合元件或互補式金氧半導體元件，如果當光發射器110使用紅外線發光二極體(LED)時，則光感測器112便可以使用紅外線感測器(Infrared Red Sensor)來代替。每一光發射器110均對應於多工器106之每一開關，並由控制元件102根據韌體程式設定發出控制訊號決定光發射器110開啟或掃描的模式。每一光感測器112均對應於多工器108之每一開關，並由控制元件102根據韌體程式設定發出控制訊號決定光感測器112開啟或掃描的模式，光感測器112根據控制元件102發出之控制訊號開啟以接收光發射器110發射並由指標物例如使用者的手指反射回之光束，光感測器112接收光束後產生光感應訊號，並將光感應訊號傳送至訊號處理元件104。經訊號處理元件104處理後之光感應訊號傳回控制元件102以進行指標物位於感測區域內的座標位置計算。在此說明的是第一圖顯示的為觸控輸入裝置的基本概念示意圖，因此省略與實施本發明主要特徵較不相關的部分。本實施例中輸入裝置省略的部分可應用任何相關習知技術加以實施，任何熟悉本領域技術者均能根據一般技術水準實施本發明。本發明觸控輸入裝置的感測區域101是一種具 備觸控輸入功能之表面，可與顯示螢幕及書寫面作結合，例如螢幕結合時形成一觸控螢幕(touch panel)的感測區域、與白板面結合時合時便形成一觸控式電子白板(electronic white board)的感測區域等，但其應用上並不只限於觸控螢幕、觸控電子白板二類型的產品，凡其他未脫離本發明所揭示精神之各種等效改變或修飾都涵蓋在本發明所揭露的範圍內。觸控螢幕包含觸控平面顯示螢幕，例如液晶顯示螢幕、電漿顯示螢幕、內投影式顯示螢幕等，亦不排除陰極射線管(cathode ray tube)螢幕。上述本發明實施例之元件僅為範例並非限制，凡其他未脫離本發明所揭示精神之各種等效改變或修飾都涵蓋在本發明所揭露的範圍內。 The first figure shows a basic conceptual diagram of an input device according to an embodiment of the present invention. An indicator in the sensing area 101, such as a user's finger or stylus, is emitted by the light emitter 110 on one side of the sensing area 101 into the sensing area 101 when the light is incident. The light beam directed at the indicator, such as the user's finger or pen, is blocked and reflected back to the light sensor 112, and the nearest light sensor 112 can produce the highest intensity light sensing signal, which is not blocked by the indicator. The broken light beam is not reflected, the light sensor 112 does not generate a light sensing signal or only generates a weak light sensing signal, and the light sensor 112 of a specific angle is reflected by the index and produces the highest intensity. The optical sensing signal is processed by the signal processing component 104 to obtain a complete signal intensity distribution curve. After combining the result of the signal distribution curve with the algorithm, the position coordinates of the pointer of the indicator can be calculated. That is to say, based on the change of the optical sensing signal and the calculation of the algorithm, the position of the indicator in the sensing area 101 can be derived. The position of the light emitter 110 and the light sensor 112 and The arrangement is preferably arranged in an interleaved manner, but is not limited thereto. The light emitters 110 are arranged in a line, and each of the light emitters 110 is controlled by a control element 102 through a switch of a multiplexer 106. Each of the photo sensors 112 is also arranged in a line and is controlled by a control element 102 through a switch of a multiplexer 108. Control element 102 includes a microcontroller (MCU), but is not limited to a microcontroller. The light emitter 110 includes an infrared light emitting diode (LED), but is not limited to an infrared light emitting diode. The photo sensor 112 includes a photoelectrically-coupled element (CMOS Senosr) such as a charge coupled device (CCD Senosr) or a complementary metal oxide semiconductor, but is not limited to a charge coupled element or a complementary metal-oxygen semiconductor element, if the light emitter 110 When an infrared light emitting diode (LED) is used, the light sensor 112 can be replaced with an infrared sensor (Infrared Red Sensor). Each of the light emitters 110 corresponds to each switch of the multiplexer 106, and the control element 102 issues a control signal according to the firmware programming to determine the mode in which the light emitter 110 is turned on or scanned. Each of the photo sensors 112 corresponds to each switch of the multiplexer 108, and the control unit 102 sends a control signal according to the firmware setting to determine the mode in which the photo sensor 112 is turned on or scanned. The photo sensor 112 is configured according to the photo sensor 112. The control signal from the control component 102 is turned on to receive the light beam emitted by the light emitter 110 and reflected back by the indicator object, such as the user's finger. The light sensor 112 receives the light beam to generate a light sensing signal, and transmits the light sensing signal to the signal. Processing component 104. The optical sensing signal processed by the signal processing component 104 is transmitted back to the control component 102 for calculation of the coordinate position of the pointer within the sensing region. What is described herein is a schematic diagram of the basic concept of the touch input device shown in the first figure, and therefore parts that are less relevant to the main features of the present invention are omitted. The parts omitted in the input device in this embodiment can be implemented by any related art, and any one skilled in the art can implement the present invention according to the general technical level. The sensing area 101 of the touch input device of the present invention is a kind The surface of the touch input function can be combined with the display screen and the writing surface. For example, when the screen is combined, a sensing area of a touch panel is formed, and when combined with the whiteboard surface, a touch type electronic body is formed. The sensing area of an electronic white board, etc., but its application is not limited to the two types of touch screens and touch electronic whiteboards, and all other equivalent changes or modifications that do not depart from the spirit of the invention are covered. Within the scope of the present invention. The touch screen includes a touch flat display screen, such as a liquid crystal display screen, a plasma display screen, an internal projection display screen, etc., and does not exclude a cathode ray tube screen. The above-described elements of the embodiments of the present invention are intended to be illustrative and not limiting, and various equivalents and modifications may be made without departing from the spirit and scope of the invention.
第二圖顯示本發明一實施例之輸入裝置訊號發射及接收的示意圖。圖中顯示一正對指標物之光發射器110發射光束進入感測區域101內，被使用者的手指阻斷並反射回的光線由所有光感測器112接收並產生光感應訊號。光感應訊號的強度大小係與光感測器112與指標物或使用者的手指之間的距離成反比，光感測器112與指標物或使用者的手指之間的距離越遠，光感測器112產生的光感應訊號就越弱。當光感測器112與指標物或使用者的手指之間的距離越近，光感測器112產生的光感應訊號就越強，因此可產生光感應訊號的分佈。由於光發射器110與光感測器112係沿Y軸排列，因此光感應訊號係沿Y軸分佈，同時可獲得指標物或使用者的手指的Y軸座標。第二圖中顯示距離指標物或使用者的手指最近的光感測器112具有最強的光感應訊號，光感測器112的光感應訊號強度分佈自中央向兩側逐步衰減。第二圖顯示的是正對指標物之光發射器110所產生之光感測器112的光感應訊號強度分佈，其他非正對指標物之光發射器110所產生之光感測器112的光感應訊 號強度分佈則有所不同，但距離指標物或使用者的手指最近的光感測器112仍具有最強的光感應訊號。 The second figure shows a schematic diagram of signal transmission and reception of an input device according to an embodiment of the invention. The figure shows that a light emitter 110 emitted by the pair of indicators enters the sensing area 101, and the light blocked by the user's finger and reflected back is received by all the light sensors 112 and generates a light sensing signal. The intensity of the light sensing signal is inversely proportional to the distance between the light sensor 112 and the index of the indicator or the user, and the distance between the light sensor 112 and the index of the indicator or the user's finger is greater. The light sensing signal generated by the detector 112 is weaker. The closer the distance between the light sensor 112 and the index of the indicator or the user's finger, the stronger the light sensing signal generated by the light sensor 112, and thus the distribution of the light sensing signal can be generated. Since the light emitter 110 and the light sensor 112 are arranged along the Y axis, the light sensing signals are distributed along the Y axis, and the Y-axis coordinates of the index or the user's finger can be obtained. In the second figure, the light sensor 112 closest to the finger or the user's finger has the strongest light-sensing signal, and the light-sensing signal intensity distribution of the light sensor 112 is gradually attenuated from the center to the sides. The second figure shows the light-induced signal intensity distribution of the light sensor 112 generated by the light emitter 110 of the indicator, and the light of the light sensor 112 generated by the light emitter 110 of the other non-aligned indicator. Induction The intensity distribution is different, but the light sensor 112 closest to the indicator or the user's finger still has the strongest light sensing signal.
如第一圖所示，為了偵測是否有指標物出現在輸入裝置感測區域內，控制元件102必須控制光發射器110發出光束之外，控制元件同時必須控制開啟光感測器112接收由指標物例如使用者的手指反射回之光束，以計算出指標物位於感測區域內的位置。控制元件102首先發出控制訊號藉由多工器106依序切換開關以依序開啟光發射器110發出光束。控制元件102發出控制訊號藉由多工器108依序切換開關以開啟光感測器112。在一實施例中，對感測區域進行全區域掃描係以控制元件102控制多工器106開啟一光發射器110發出光束，接著由控制元件102控制多工器108逐一開啟所有的光感測器112以接收第一個光發射器110發射後可能反射傳回的光束。然後控制元件102控制多工器106開啟第二光發射器110發出光束，接著由控制元件102控制多工器108再次逐一開啟所有光感測器112以接收第二個光發射器110發射後可能反射傳回的光束，接著重複進行直至最後一個光發射器110發出光束並由所有光感測器112接收可能反射傳回的光束。若指標物出現在輸入裝置感測區域內，光感測器112接收到所有光發射器110依序發射的光束自指標物反射傳回的光束，由於各光發射器110與光感測器112與指標物的距離均不相同，因此產生光感應訊號強度沿Y軸的分佈。比較光感應訊號強度值，可推算出指標物位於感測區域101內Y軸方向的大約位置。 As shown in the first figure, in order to detect whether an indicator appears in the sensing area of the input device, the control element 102 must control the light emitter 110 to emit a light beam, and the control element must simultaneously control the light sensor 112 to receive the light sensor 112. The indicator object, such as the beam reflected back by the user's finger, calculates the position of the indicator within the sensing area. The control component 102 first issues a control signal to sequentially switch the switches by the multiplexer 106 to sequentially turn on the light emitter 110 to emit a light beam. The control element 102 sends a control signal to sequentially switch the switch by the multiplexer 108 to turn on the photo sensor 112. In one embodiment, the full area scanning of the sensing area is controlled by the control element 102 to control the multiplexer 106 to turn on a light emitter 110 to emit a light beam, and then the control unit 102 controls the multiplexer 108 to turn on all of the light sensing one by one. The device 112 receives the light beam that may be reflected back after being transmitted by the first light emitter 110. The control element 102 then controls the multiplexer 106 to turn on the second light emitter 110 to emit a light beam, and then the control unit 102 controls the multiplexer 108 to turn on all of the light sensors 112 one by one to receive the second light emitter 110 after the launch. The reflected light beam is reflected and then repeated until the last light emitter 110 emits a light beam and all of the light sensors 112 receive a light beam that may be reflected back. If the indicator appears in the sensing area of the input device, the light sensor 112 receives the light beams that are sequentially transmitted from the light emitters 110 and are reflected back from the indicator, because each of the light emitters 110 and the light sensor 112 The distance from the indicator is different, so the distribution of the intensity of the photo-sensing signal along the Y-axis is generated. Comparing the photo-sensing signal intensity values, it can be inferred that the index object is located at approximately the Y-axis direction in the sensing region 101.
當確定指標物位於感測區域101內Y方向的大約位置，接著對感測區域進行部份區域掃描。控制元件102控制多工器106開啟光感 應訊號強度最強之光發射器110發出光束，接著由控制元件102控制多工器108開啟所有光感測器112以接收此光發射器110發射後可能反射傳回的光束。根據所有光感測器112的光感應訊號強度分佈比較光感應訊號強度值大小，擷取光感應訊號強度最強與二個次強之光感測器112的訊號強度值，藉由此三個光感應訊號強度的實際位置相鄰距離及演算法的計算，可計算出指標物位於感測區域101內的精確的Y座標。計算出指標物位於感測區域101內的Y座標可以利用以下公式：YR={(Y1st-Y2nd)/[(Y1st-Y2nd)+(Y1st-Y3rd)]}×(L×KR) When it is determined that the indicator is located at an approximate position in the Y direction in the sensing area 101, a partial area scanning is performed on the sensing area. The control component 102 controls the multiplexer 106 to turn on the light emitter 110 with the strongest intensity of the light-sensing signal to emit a light beam, and then the control component 102 controls the multiplexer 108 to turn on all the light sensors 112 to receive the light reflector 110. The beam of light returned. Comparing the intensity values of the photo-sensing signals according to the intensity distribution of the photo-sensing signals of all the photo sensors 112, extracting the signal intensity values of the photo-sensing signal intensity and the second-order optical sensor 112, thereby using the three lights The actual position adjacent distance of the induced signal strength and the calculation of the algorithm can calculate the exact Y coordinate of the indicator in the sensing area 101. Calculating the Y coordinate of the indicator in the sensing region 101 can use the following formula: Y R ={(Y 1st -Y 2nd )/[(Y 1st -Y 2nd )+(Y 1st -Y 3rd )]}×( L×K R )
Y=(n-1)×(L×KR)+YR Y=(n-1)×(L×K R )+Y R
其中若二光感測器112彼此之間的相隔距離為L英吋，且每英吋的解析度為KR，Y1st為光感應訊號強度最強之光感測器112的訊號強度值，Y2nd為光感應訊號強度第二強之光感測器112的訊號強度值，Y3rd為光感應訊號強度第三強之光感測器112的訊號強度值，YR為指標物於Y軸的相對於最強之光感測器112的相對位址，Y為指標物於Y軸的絕對位址。 Wherein, if the distance between the two photosensors 112 is L inches, and the resolution per inch is K R , Y 1st is the signal intensity value of the photo sensor 112 having the strongest intensity of the photo-sensing signal, Y 2nd is the signal intensity value of the light sensor 112 having the second strongest intensity of the light sensing signal, Y3rd is the signal intensity value of the light sensor 112 having the third strongest intensity of the light sensing signal, and Y R is the index of the indicator on the Y axis. Relative to the relative address of the strongest photosensor 112, Y is the absolute address of the indicator on the Y-axis.
為了計算出指標物位於感測區域101內位置的X座標，可利用第三圖所示的計算方式。若光感測器N為光感應訊號強度最強之光感測器，根據已計算出指標物位於感測區域101內位置的Y座標，以及事先已知的與Y座標最接近的次強的光感測器112座標例如光感測器N+1的Y座標值，可得到指標物的Y座標分別與光感測器N與光感測器N+1的Y方向的間隔距離Y1與Y2。也就是說，Y1加上Y2的長度正好為L英吋。如同先前所提的，當光感測器112與指標物或使用者的手指之 間的距離越近，光感測器112產生的光感應訊號就越強，所以，由光感測器N與光感測器N+1所接收的光感應訊號強度值可以得到指標物位於感測區域101內位置與光感測器N與N+1的直線距離L1與L2，二相鄰光感測器之間的距離為L英吋，藉由已知Y1與L1以及Y2與L2可分別計算X1與X2。最後，指標物位於感測區域101內位置的X絕對座標便可以藉由以下公式計算而得：X1 2=L1 2-Y1 2 In order to calculate the X coordinate of the position of the indicator in the sensing area 101, the calculation method shown in the third figure can be utilized. If the photo sensor N is the photo sensor with the strongest intensity of the photo-sensing signal, the Y-coordinate of the position where the index is located in the sensing area 101 and the second-strongest light closest to the Y coordinate are known. the sensor 112 such as an optical sensor coordinate Y coordinate value N + 1, Y coordinate thereof is obtained indicator and the light sensor are N and N + Y direction, the light sensor 1 and the distance Y 1 Y 2 . That is to say, the length of Y 1 plus Y 2 is exactly L inches. As previously mentioned, the closer the distance between the light sensor 112 and the index of the indicator or the user's finger, the stronger the light sensing signal generated by the light sensor 112, so that the light sensor N and The photo-sensing signal intensity value received by the photo sensor N+1 can obtain the linear distances L 1 and L 2 of the index in the sensing region 101 from the photo sensor N and N+1, and the adjacent optical sensitivities The distance between the detectors is L inches, and X 1 and X 2 can be calculated by knowing Y 1 and L 1 and Y 2 and L 2 , respectively. Finally, the X absolute coordinate of the position of the indicator in the sensing area 101 can be calculated by the following formula: X 1 2 = L 1 2 - Y 1 2
X2 2=L2 2-Y2 2 X 2 2 = L 2 2 - Y 2 2
X=(X1+X2)/2 X=(X 1 +X 2 )/2
本發明之輸入裝置及位置掃描方法將光發射器與光感測器配置於感測區域的一側，在一實施例中，光發射器與光感測器係交錯排列以節省所用零件數量並降低成本。觸控位置掃描方法係透過光感測器全區域依序掃描及部份區域掃描方式進行，並可透過微控制器韌體的撰寫而達成。本發明係於第一次逐點掃描找出具有最大光感測訊號之光感測器之後，於後續掃描中即不再進行全數光感測器掃描，而僅是進行部分區域的掃描。部分掃描只掃描具有最大感測訊號光感測器之鄰近一定範圍之光感測器，例如前後各三光感測器，當指標物移動時，進行之部分掃描會偵測具有最大感測訊號光感測器係相對於指標物之移動。因此僅須更新部份掃描所要掃描的前後一定範圍之光感測器，提昇掃描及跟蹤指標物移動之速度。 The input device and the position scanning method of the present invention configure the light emitter and the light sensor on one side of the sensing area. In one embodiment, the light emitter and the light sensor are staggered to save the number of parts used. cut costs. The touch position scanning method is performed by sequential scanning and partial area scanning of the entire area of the light sensor, and can be achieved by writing the firmware of the microcontroller. The invention is based on the first point-by-point scan to find the light sensor with the largest light sensing signal, and in the subsequent scanning, the full light sensor scanning is not performed, but only the partial area scanning is performed. Partial scanning scans only a certain range of light sensors with the largest sensing signal, such as front and rear three light sensors. When the indicator moves, part of the scanning will detect the light with the largest sensing signal. The sensor is moved relative to the indicator. Therefore, it is only necessary to update a certain range of light sensors to be scanned before and after scanning, and to improve the speed of scanning and tracking indicators.
上述之實施例僅係為說明本發明之技術思想及特點，其目的在使熟悉此技藝之人士能了解本發明之內容並據以實施，當不能據以 限定本發明之專利範圍，即凡其他未脫離本發明所揭示精神所完成之各種等效改變或修飾都涵蓋在本發明所揭露的範圍內，均應包含在以下之申請專利範圍內。 The embodiments described above are merely illustrative of the technical spirit and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement them. The scope of the invention is defined by the scope of the invention, which is intended to be included within the scope of the invention.
101‧‧‧感測區域 101‧‧‧Sensing area
102‧‧‧控制元件 102‧‧‧Control elements
104‧‧‧訊號處理元件 104‧‧‧Signal Processing Components
106‧‧‧多工器 106‧‧‧Multiplexer
108‧‧‧多工器 108‧‧‧Multiplexer
110‧‧‧光發射器 110‧‧‧Light emitter
112‧‧‧光感測器 112‧‧‧Light sensor
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200811697A (en) * | 2006-08-31 | 2008-03-01 | Egalax Empia Technology Inc | Apparatus and method for detecting position, and touch panel using the same |
| TWM337727U (en) * | 2007-06-04 | 2008-08-01 | ying-xiu Lin | Optics alignment/positioning apparatus |
| TW200837622A (en) * | 2007-01-03 | 2008-09-16 | Apple Inc | Simultaneous sensing arrangement |
| TW200928927A (en) * | 2007-12-19 | 2009-07-01 | Li Shu Fen | Electronic whiteboard |
-
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200811697A (en) * | 2006-08-31 | 2008-03-01 | Egalax Empia Technology Inc | Apparatus and method for detecting position, and touch panel using the same |
| TW200837622A (en) * | 2007-01-03 | 2008-09-16 | Apple Inc | Simultaneous sensing arrangement |
| TWM337727U (en) * | 2007-06-04 | 2008-08-01 | ying-xiu Lin | Optics alignment/positioning apparatus |
| TW200928927A (en) * | 2007-12-19 | 2009-07-01 | Li Shu Fen | Electronic whiteboard |
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