TWM419987U - An optical touch system - Google Patents

Abstract

The present disclosure provides an optical touch system based on stereo vision theory. The proposed optical touch system adopts at least two adjustable linear image sensors to capture image information so that the information can be applicable to different sizes of touch screens by adjusting locations of the image sensors. Sensing area covers the whole screen without the need to increase quantity of sensors.

Description

M419987 V. New Description: [New Technology Field] This creation relates to an optical touch system, and more particularly to an optical touch system for determining the touched position by means of an adjustable positioning method. [Prior Art] The types of common touch screens are resistive, capacitive, sonic, and optical. The resistive touch screen uses a spacer to separate two layers of Indium Tin Oxide (ITO) conductive layer. When used, the pressure causes the upper and lower electrodes to conduct, and detects the voltage change on the screen after the electrode is turned on. Thereby calculating the position of the touch. The capacitive touch screen is a change in capacitance caused by the electrostatic combination between the arranged transparent electrodes and the human body, so that the leaves calculate the position coordinates of the contact points. The acoustic wave touch screen converts the electrical signal into ultrasonic wave in advance and directly transmits it to the surface of the touch screen. When the user touches the control screen, the ultrasonic wave is absorbed to cause attenuation, and the ultrasonic wave before and after the touch is compared. The amount of attenuation gives you an accurate touch position. Resistive touch screens and capacitive touch screens have always been the mainstream of the market. However, as touch screens become larger and larger, and requirements are getting higher, manufacturers are making large-scale resistive and capacitive touches. Under the cost of the screen, optical touch technology has gradually surfaced. Common optical touch screens are broadly classified into the following types: infrared, CMOS/CCD, internal, and projection. These optical touch technologies all create shadows by the shading effect, and a photosensitive element (such as an image sensor) senses the change in shadow to determine where the touch is. Among them, the image sensor is a device developed on the basis of optoelectronic technology, which converts optical images into one-dimensional timing signals. It includes electron beam camera tubes, vacuum tube image sensors such as reinforced tubes and phase-change tubes, Charge Coupled Devices (CCD), Complementary Metal-Oxide Semiconductor Field Effect Transistor (CMOS). Such as semiconductor integrated image sensors and scanning image sensors. Among them, vacuum image sensors such as electron beam cameras are gradually being replaced by semiconductor integrated image sensors such as CCD and CM〇s. Traditional optical touch screens have the common disadvantage of increasing or decreasing the number of sensors for the size of the touch screen in order to be suitable for different sensing ranges. Moreover, the existing touch screens are basically customized products, which is a big burden for manufacturers. Therefore, the present invention proposes an optical touch system for determining the touched position by means of an adjustable positioning method, which can be adapted to different specifications of touch by only the position of the s peripheral sensor. [New content] In view of the above technical problems, the main purpose of this creation is to provide an optical touch system. According to the proposal of the present invention, an optical touch system includes a to-be-sensed area and a sensing unit, the sensing unit includes at least two image sensors, and the position of the image sensor Adjustable and mutually intersecting to form a cross-region; the intersection area covers the area to be sensed. / In this way, the effect achieved by the creation is that at least two adjustable image sensors are used to age the image information, so that the position of the image sensing H can be adjusted to adapt to different screen sizes. Screen, the measurement area covers the entire screen without increasing the number of sensors. At the same time, the optical touch system set by the author of this 4 corresponds to the money measurement H / ‘ can make the stylus shot _ touch position of the sale. (4) Less touch response time and improve to enable more progress - Learn about this creation. Read the following detailed description of this creation. References and readings, "Silk material:: Plus =; Close only" [Implementation] The following is a description of the technical solution of the present invention in conjunction with the accompanying drawings, and further explains the present creation. The optical touch system in this creation is based on the stereo vision theory. The reason is that the left and right eyes are different from each other. The left eye sees the object slightly to the left, and the right eye sees the object slightly to the right. The nerves are transmitted to the brain, which then combines the two images into a single stereo image. This creation combines the principle of photography and the theory of stereo vision. The two or two image sensors used are equivalent to the left and right eyes of the person, and the positioning of the control point is implemented from *. The moonlight camera records the data of the three-dimensional space on a medium in two-dimensional space. For a conventional camera, the medium is a negative film, and for a digital camera, this medium is each primitive on the CMOS sensor. When three-dimensional space information is recorded on a medium in two-dimensional space, there is a certain geometric relationship between them. As shown in Fig. ,, a p-point of a three-dimensional space whose coordinates relative to the center of the camera is (x〇 ye, ze), and the corresponding coordinates projected on the image plane by the photographic process are (Xi, yi). The geometric relationship between the two is as follows: 0) M419987 Xc

Zc yi fy- Zc (2) ΑρίΙΓ is the rotation of the center of the camera and the center of the image plane. This number is a known value. Therefore, if a three-tone value (1) and (2) is known to find that the point corresponds to the image flat =, the opposite 'if it is known that the image plane such as = cannot be reversed; the position of the point P. (10) 驴This is a picture of the P point recorded when two cameras are located at the same-reference line and the distance between them is L. As shown in Fig. 2, the coordinates of the target = Jane (10) are (χ一), corresponding to the left photography: iriyci, zci), the coordinates of the corresponding points on the left image plane are (~, y; 1), corresponding to (4) the coordinates of the camera are (,, ^, z small on the right image plane The coordinates of the corresponding points are (Xi^); their mutual_relationship can be derived from the geometric relationship in Fig. 2 as equation (3).

Xcl Xcr Zc -=-=— XU Xir f

Zc L = Xcl- - Xir)

Zc _J£_ (jC/7 — Xir) (3) 6 M419987 Therefore, from the embodiment (3), it can be known that if the coordinate information of Pn and Pir is known, it can be quickly calculated by the formula (3). Calculate Zc. Similarly, xc and yc can be calculated from the following two relational mathematical formulas, so that the exact position coordinates (xc, yc, zc) of point P can be obtained:

_ L Xil + Xir 2 Xil — Xir

(4) (5) Therefore, from the embodiment (3), it can be known that if it is known to be the coordinate information of Pir, zc can be quickly calculated by formula (3), and the same can be used by the following two The relational mathematical formula calculates xc* yc, so the exact position coordinates of the P point (xc, yc, zc) can be derived from the theoretical basis of equations (4) and (5). The theory is called Stereo Vision. Or Bi-nocular Vision theory. As shown in FIG. 3, an optical touch system 30 includes at least a first image sensor 31 and a second image sensor 32. According to the stereoscopic vision theory described above, the first image sensor 31 and the second image sensor 32 are equivalent to the two cameras mounted on the same reference line in FIG. 2, but the present embodiment is applied to the touch. The control panel, so: yc = yil = yir = fixed value, the fixed value can be set to 0; therefore, the first image sensor 31 and the second image sensor 32 of the embodiment can adopt a linear CMOS sense A detector or linear CCD sensor is used instead of a two-dimensional image sensor. In addition, the distance L between the first image sensor 31 and the second image sensor 32 is also fixed, and the actual relationship can be obtained according to the geometric relationship of the above formula (3) (4) (5). Touch the location. As shown in FIG. 3, the optical touch system 3 including the first image sensor 31 and the 7 M419987 second image sensor 32 is combined to make the existing non-touch Control the display screen to upgrade to the touch #^phase pen 40 or finger or other object touches the display panel (7) when the two touch sensor 31, and the second image sensor image of the human image, the system will two Group image information = the capital touch to make it perform the corresponding c. The first image sensor; the measurement range is adjustable 1 and the parent area; and all the positions of the area to be sensed are covered by adjusting the image sensors 31, 3 and the area. For example, Ϊ =:= section ~ as shown in Figure 5... == The area to be sensed; the angle lens to expand the sensing range; such as the projection screen. Go to (4) & panel 'can also be other screens for the image sensor ^ when the size changes, the user can input the value to the system, the position, and start the calibration program by the value adjustment. Μ, ^, Ρ can be applied to the new touch system. The external _ + & silk touch system 3G can be combined with _ inline or 6 ^ 1M. When the in-line combination is used, such as ^20; when the system is used; the system 3 can be integrated into the display panel 10, the outer frame 30 includes at least the first-type combination, as shown in FIG. 7 'optical touch system body 33, as shown in FIG. 8 , the image sensor 31 , the second image sensor 32 , and the outer panel of the shell panel 1 , the housing 33 of the optical touch system 30 and the display of his screen, for example, The attack is 34 4 mesh connection; when the display screen is on the periphery of the screen, the optical touch system 30 can also be plugged 8 M419987

The optical touch system further includes a stylus 40, and the stylus emits a spectrum corresponding to the image sensor to reduce the touch response time and improve the accuracy of detecting the touch position. For example, if the image sensor uses a CMOS sensor, the corresponding stylus 4 can incorporate an infrared light source. Since the CMOS sensor itself has different responses to different wavelengths of the spectrum, especially the response to the infrared spectrum is highly sensitive, when the CMOS sensor operates the touched position image information, the CMOS sense The primitives of the corresponding area on the detector are stimulated by the infrared light to present a response to the supersaturated state' to obtain the touched position information. As shown in Fig. 9, the stylus 4A includes at least a dual control switch 42 and an infrared LED (light emitting diode) 41. Infrared LED 41 can use infrared light in the 890 nm-980 nm spectrum. When the dual control switch 42 is turned on, the stylus 4 〇 performs information input 'the CM0S sensor captures the image of the infrared LED, and the corresponding element of the sensor is stimulated by the infrared light to reach the supersaturation response state, and then Calculate the plaque composed of the super-saturated primitives, the position of the center point, and know the position of the touched. This method can not only

It saves a few long and meaningful image processing, and it can improve the speed and accuracy of touch response.囷〇, 定位, an optical touch system positioning method, comprising S100: synchronously driving two image sensors; capturing a shadow S200 of the area to be sensed. The two image sensors are respectively like information Determine whether there is supersaturation and go back to the next step. If there is no S300. Analyze the above image information, if there is a patch with supersaturation response, return to step S100; 9 M419987 S400: Integrate the above two images The image information captured by the detector respectively calculates the position information of the region to be sensed corresponding to the supersaturated response patch, and S500: calculating the center point position of the patch implanted by the super-saturated primitive, thereby It is known that the area to be sensed is touched by the location information. The above-mentioned embodiments are only used to enumerate the preferred embodiments of the present invention, and to illustrate the technical features of the present invention, and are not intended to limit the scope of protection of the present creation. Any person skilled in the art can easily complete the feature equivalent replacement of the present solution. Subject to the scope of protection claimed by this creation, the scope of protection of this creation shall be subject to the claims. [Simple diagram of the diagram] Figure 1 is a schematic diagram of the stereo vision theory of the optical touch system; Figure 2 is a schematic diagram of the stereo vision theory of the optical touch system; Figure 3 is an optical touch system including a stylus Schematic diagram of the structure; Figure 4 is a schematic diagram of the structure of the adjustable touch system; ^ Figure 4 is a schematic diagram of the mutual spacing adjustment of the clear touch system in the fourth picture. The sixth is the embedded touch system _ schematic; the external touch Schematic diagram of the structure of the system; 2 = sectional view of the connection structure of the hanging touch system outside the figure 7; 2 = structure diagram of the IR_LED_ control pen; flowchart of the positioning method of the θ疋 optical touch system. M419987 [Main component symbol description] 110 display panel 20 outer frame 30 optical touch system 31 first image sensor 32 second image sensor 33 housing 34 fixing screw 35 adjustment mechanism 40 stylus 41 infrared 42 dual control switch

Claims (1)

M419987 VI. Patent Application Range: 1. An optical touch system comprising a to-be-sensed area and a sensing unit, wherein the sensing unit comprises at least two image sensors, the image sensor The positions are adjustable and intersect each other to form an intersection, the intersection covering the area to be sensed. 2. The optical touch system of claim 1, wherein the image sensor employs a line sensor. 3. The optical touch system of claim 1, wherein the image sensor employs a complementary metal oxide semiconductor sensor or a charge coupled component sensor. 4. The optical touch system of claim 1, wherein the area to be sensed is a display panel or a projection screen. 5. The optical touch system of claim 4, wherein the optical touch system is in-line or externally coupled to the display panel or the projection screen. 6. The optical touch system of claim 1, wherein the image sensor is provided with a wide-angle lens. 7. The optical touch system of claim 1, further comprising a stylus, the spectrum emitted by the stylus corresponding to the image sensor. 8. The optical touch system of claim 7, wherein the stylus has an infrared light emitting diode built in, and the image sensor uses a complementary metal oxide semiconductor sensor. 9. The optical touch system of claim 8, wherein the infrared light emitting diode has a spectrum of 890 nm to 980 nm. 12