CN101630213A - Optical touch screen, optical touch screen light source and touch pen - Google Patents

Abstract

The invention relates to the field of touch screens, in particular to an optical touch screen. The optical touch screen comprises a touch pad, a signal processing system and a photosensitive element group, wherein the photosensitive element group comprises a plurality of photosensitive elements, and the plurality of photosensitive elements are connected with the signal processing system. The optical touch screen light source comprises a light source, and light rays generated by the light source are uniformly irradiated on the touch pad with the transparent medium on the outer surface and are transmitted to the outer side of the touch pad. The touch type touch pen comprises a switch and a light-emitting element, wherein the switch controls the light-emitting condition of the light-emitting element. The remote touch pen comprises a laser and a power supply and further comprises a shell convenient to hold, the laser and the power supply are arranged in the shell, a switch is arranged between the laser and the power supply, and the switch is arranged on the shell. The anti-interference capability is strong, the oil stain resistance is high, and the anti-interference oil stain resistant paint is suitable for occasions with heavy oil stains, such as factory workshops, mining areas and the like. The conversion between the remote touch mode and the contact touch mode can be easily realized.

Description

Optical touch screen and optical touch screen light source and stylus

technical field

The invention relates to the field of touch screens, in particular to an optical touch screen.

Background technique

Existing touch screens made of optical properties mainly contain two types, one is an infrared touch screen; the other is a touch screen called a laser electronic whiteboard, which is mainly used in projectors, and uses laser tracking technology to scan the surface and touch handwriting.

Existing infrared touch screens include through-beam infrared touch screens and infrared touch screens with optical receiving elements on the back. Compared with other touch screens, infrared touch screen has a series of advantages such as stable performance, strong anti-interference ability, long life and high precision. Almost with an overwhelming advantage, it gradually occupied the market of other touch screens.

But the infrared touch screen still has a fatal weakness that is difficult to overcome, that is, the infrared window is afraid of being dirty. It is not suitable for use in unclean environments, such as factory workshops, mining areas and other places with heavy oil pollution; for example, it cannot be used in open public places such as train waiting halls and cash machines outside the city. In addition, an infrared anti-radiation tube will be installed on the outside of the screen, which affects the compactness of the structure. It is inconvenient to use on small screens, such as inconveniently used on the screens of mobile phones and handheld computers. In addition, the cost of infrared touch screen is still high, and the resolution is still low.

The main purpose of the laser electronic whiteboard system is to use it with a projector. Laser emitters for scanning the projector screen are mounted on each side of the projector screen. After the laser electronic whiteboard is started, the laser emitter emits laser light to scan the surface of the projector screen. The matching photosensitive pen has the function of sensing laser, so when the user uses the photosensitive pen to operate on the electronic whiteboard, the laser emitter will scan to the position of the photosensitive pen. The laser electronic whiteboard system interacts with the computer through the position information of the photosensitive pen.

The structure of the laser electronic whiteboard system is relatively complicated, so the cost is also high, and the general price is 3,000 to 7,000 yuan. It is difficult to install and debug. Professionals are required to locate the laser scanning part during installation. Inaccurate positioning or slight movement during use will easily cause misoperation, and even cause abnormal use, so the application occasions are very limited.

Combining the existing touch screens, until now there has not been a touch screen like paper that allows people to lie on it to write. People can't get the feeling and convenience of original writing through touch screen. The existing touch screen still has disadvantages such as poor anti-interference ability, low resolution, and inconvenient remote control.

Contents of the invention

The object of the present invention is to provide an optical touch screen, which can effectively improve the performance of the touch screen.

The object of the present invention is also to provide a touch pen matched with an optical touch screen, and the touch pen includes a contact touch pen and a remote touch pen. Contact stylus, with optical touch screen for contact touch. Remote touch pen, with optical touch screen to realize remote touch.

To achieve the above object, the present invention adopts the following technical solutions:

The optical touch screen includes a touch panel, a signal processing system, and a photosensitive element group. The photosensitive element group includes a plurality of photosensitive elements connected to the signal processing system. The photosensitive elements in the photosensitive element group are connected to the touch panel through light ;

When the optical touch screen is used, a relevant light spot appears on the touch panel, and the photosensitive element is irradiated by the light from the light spot, which is reflected as a relevant electric signal.

A relevant light point is presented on the touch panel, and the photosensitive element group is irradiated by the light from the light point, which is reflected as a related electrical signal, and the intensity of the electric signal is related to the distance from the photosensitive element to the light point; The electrical signals generated by the photosensitive elements are transmitted to the signal processing system, and the signal processing system obtains the position information of the light spot on the touch panel by analyzing the information including the intensity of the electrical signals generated by the photosensitive elements.

It is also possible that the optical touch screen includes a plurality of photosensitive element groups, and a converging lens is arranged in front of the photosensitive element groups. The light is converged to the photosensitive surface of the photosensitive element group through the converging lens. The converging lens can present a clear image of the light spot on the photosensitive surface, or it can just irradiate the converged light of the light spot on the photosensitive surface, not necessarily forming an image.

After the converging lens is used, the electrical signal generated on the photosensitive element group is related to the distance and angle of the light spot relative to the photosensitive element group. The photosensitive elements of the photosensitive element group are allowed to be integrated in a small space, which can reduce manufacturing difficulty and cost. In addition, the angular relationship between the photosensitive element group and the light spot is introduced, which helps to determine the position of the light spot.

The electrical signal generated by the photosensitive element is transmitted to the signal processing system, and the signal processing system obtains the position information of the light spot on the touch panel by analyzing the electrical signal information generated by the photosensitive element group. The signal processing system processes the electrical signals generated by the photosensitive element group, and can process information related to distance in the electrical signals, information related to angles in the electrical signals, or comprehensively.

The photosensitive element group can be formed by orderly combining a plurality of independent photosensitive elements, can also integrate a plurality of photosensitive elements on an integrated block, and can also directly use an image sensor integrated with a large number of photosensitive elements.

When the light spot flickers at a certain frequency, the photosensitive element will generate an oscillating electrical signal related to the frequency of the light signal of the light spot. The oscillating electrical signal is convenient for amplification and frequency selection, and has better anti-interference performance. Therefore, the light The dots are light dots that flicker at a certain frequency, and the signal processing system includes a frequency selection module corresponding to the flickering frequency of the light dots. The light points presented on the touch panel that can be identified by the optical touch screen are considered as light points related to the optical touch screen. In general, the relevant light spots need to be satisfied. The flicker frequency corresponds to the frequency selection module of the optical touch screen, and the light wavelength of the light spot corresponds to the receiving wavelength of the photosensitive element.

The above-mentioned technical solutions do not involve requirements on the shape of the touchpad, and the shape of the touchpad is not specifically limited. Since the screens currently used are mostly quadrangular screens, the following explanations will be made with reference to the quadrangular touchpad.

In the signal processing system of the present invention, the position of the light spot can be obtained by comparing the distance difference relationship between the light spot and the photosensitive elements in the photosensitive element group, and the distance difference is received by each photosensitive element from the light point. The difference in optical signal intensity is reflected. For a flat touch panel, only two rows of cross-arranged photosensitive elements are needed to determine the position of the light point. A row of photosensitive elements arranged horizontally determines the horizontal coordinates of the light spot through the relative electrical signal difference relationship generated by each photosensitive element; a row of photosensitive elements arranged vertically determines the relative electrical signal difference relationship generated by each photosensitive element , to determine the longitudinal coordinates of the light point, so as to determine the position of the light point on the touch panel. The "connection between the photosensitive elements in the photosensitive element group and the touch panel through light" means that at least one beam of light passing through the touch panel passes through the photosensitive element. It is not necessary that all the photosensitive elements in the photosensitive element group are connected with the touch panel through light, but at least two photosensitive elements are connected with the touch panel through light.

The signal processing system in the present invention can also obtain the position of the light spot through the angular relationship between the light spot and the photosensitive element group. In the present invention, the light is converged to the photosensitive surface of the photosensitive element group through the converging lens. The angular relationship is reflected by the position where the light signal of the light spot is converged on the photosensitive element group by the converging lens. For a flat touchpad, two groups of photosensitive elements with converging lenses can determine the position of the light spot. One photosensitive element group determines an angle-dependent polar coordinate, and two photosensitive element groups determine two mutually alternate angle-dependent polar coordinates. The position of the light spot is determined by including the information determined by the two polar coordinates.

When the signal processing system obtains the position of the light spot through the angular relationship between the light spot and the photosensitive element group, it can also analyze the difference relationship between the light signal intensities on the photosensitive elements in the photosensitive element group, so as to improve the accuracy.

Touch pad can select the screen of display for use, as the screen of rear projection display, liquid crystal display screen, cathode display tube display (CRT) screen, the screen of LED display, projector screen;

When the touchpad is a screen, the photosensitive elements in the photosensitive element group can be arranged around the screen. When the screen is a light-transmitting screen, such as the screen of a rear-projection display, since the light of the light spot can penetrate the screen, the photosensitive elements in the photosensitive element group can be arranged not only in front of the screen, but also in the front of the screen. Behind the screen; when the screen is a screen with a transparent medium in front, the transparent medium such as glass or transparent plastic, the light emitted by the light point can propagate inside the transparent medium to the surroundings of the transparent medium, so the photosensitive elements in the photosensitive element group can be arranged in addition to Around the front of the screen, they can also be arranged around the edge of the light-transmitting medium.

The photosensitive element group may or may not be provided with a converging lens. In the case of setting a converging lens, the corresponding selection is to obtain the signal processing system of the position of the light spot through the information including the angle relationship between the light spot and the photosensitive element group. In the case of no converging lens, the corresponding selection is a signal processing system for obtaining the position of the light spot by comparing the distance difference relationship between the light spot and the photosensitive elements in the photosensitive element group. The following content focuses on the case where the photosensitive element group is not provided with a converging lens.

When the touch panel is a transparent protective plate, the light of the light spot can obviously penetrate the protective plate, so the photosensitive element group can be arranged in front of the protective plate; it can also be arranged between the screen and the protective plate, that is, behind the protective plate; Can be arranged around the edge of the fender. According to the above design structure, the optical touch screen can be made into various types of optical touch screens.

According to different operation modes, the present invention includes a contact touch optical touch screen and a remote touch optical touch screen.

1. Optical touch screen with contact touch

The light source of the light point has three forms, one form is that the optical touch screen itself does not have a light source, and the device used in conjunction with the optical touch screen has a light source, such as a contact touch pen, and the light source generates the light point; One form is that the optical touch screen itself has an optical touch screen light source, and the optical touch screen light source has a light source, and the light source is the light source of the light point; one form is that the optical touch screen itself has an optical touch screen light source, and the external device that is matched with the optical touch screen also has a light source. The light source of the light spot is any one of them.

(1) The optical touch screen itself does not have a light source:

Devices that need to be used in conjunction with the optical touch screen from the outside world are used in conjunction with the optical touch screen, such as a contact stylus.

The touch pen emits light when it is in contact with the optical touch panel, forming a light spot on the touch panel, and the light spot moves with the movement of the touch pen, so that the touch pen can touch the optical touch screen through the moving light spot operate.

The touch-type stylus is characterized in that it includes a pen case, a power supply, a switch and a light-emitting element, and the switch controls the light-emitting condition of the light-emitting element; the switch is connected with the touch end of the touch-type stylus, and the touch end triggers the switch when touching the touch panel to emit light The element emits light, forming a spot of light on the touchpad.

A signal generating module that generates an oscillating electrical signal can be connected between the power supply and the light-emitting element, so that the light-emitting element can generate a flickering light signal.

The touch panel has a wide range of selection, such as screens of rear projection displays, liquid crystal display screens, cathode display tube display (CRT) screens, screens of LED displays, and projector screens; transparent protective plates in front of various screens can also be used.

The touch pad is a screen, and the photosensitive elements in the photosensitive element group are arranged around the screen. When the screen is a light-transmitting screen, such as the screen of a rear projection display, since the light spots can penetrate the screen, the photosensitive elements in the photosensitive element group can be arranged not only in front of the screen but also behind the screen; the screen is When the front is a screen with a transparent medium, the transparent medium such as glass or transparent plastic, the light emitted by the light point can be transmitted to the periphery of the transparent medium inside the transparent medium, so the photosensitive elements in the photosensitive element group can be arranged in front of the screen, and can also Arranged around the edge of the transparent medium, it can also be embedded inside the transparent medium.

When the touch panel is a transparent protective plate, the light of the light spot can obviously penetrate the protective plate, so the photosensitive element group can be arranged in front of the protective plate and arranged around the protective plate; it can also be arranged between the screen and the protective plate. That is, the back of the protective plate is arranged around the protective plate; it can also be arranged around the edge of the protective plate; it can also be embedded in the transparent medium.

(2) The optical touch screen itself has an optical touch screen light source:

The optical touch screen also includes an optical touch screen light source, which has a light source. The front part of the touch panel is a transparent medium, and the light generated by the light source is evenly irradiated on the touch panel with the transparent medium on the outer surface, and transmits to the outside of the touch panel.

The light source is evenly irradiated on the touch panel from the back or side of the touch panel, and is transmitted to the outside of the touch panel more uniformly; a touch piece is used to touch the touch panel, and the touch piece is irradiated by the light of the light source to form a light spot. The touch member refers to an object that touches the touchpad, which may be a finger, a pen, or the like.

The light spot moves with the movement of the touch piece, and the touch operation of the touch piece on the optical touch screen is realized through information such as the movement of the light spot, the existence of the light spot, and the flickering frequency of the light spot.

The touchpad can be selected from a transparent protective plate at the front of the screen, and the screen can also be selected. If the screen is selected, the front of the screen needs to be a transparent medium, such as a liquid crystal display screen or a cathode display tube display (CRT) screen.

Using the shield as a touchpad:

A strip light source is provided on the lateral side of the protective plate close to the screen, and a photosensitive element group composed of a row of photosensitive elements is provided on the other lateral side. The light of the strip light source passes through the protective plate, and the irradiation direction is opposite to it. The other horizontal side is slightly inclined to the front of the protective plate; a strip-shaped light source is provided on the longitudinal side of the protective plate close to the screen side, and a photosensitive element group composed of a row of photosensitive elements is provided on the other longitudinal side. The light from the light source passes through the protective plate, and the irradiation direction is the other longitudinal side opposite to it, and slightly obliquely towards the front of the protective plate. Because the strip light source is slightly oblique to the front of the protective plate, there will be light in a state of total reflection in the protective plate, and these light rays are also conducive to uniform light.

Two rows of photosensitive elements are connected to one, and the signal processing system obtains the position of the light spot by comparing the distance difference relationship between the light spot and the photosensitive elements in the photosensitive element group. The above two photosensitive element groups composed of a row of photosensitive elements can be replaced by photosensitive element groups provided with converging lenses, and the two photosensitive element groups provided with converging lenses are connected by including the angular relationship between the light spot and the photosensitive element groups Within the information, the signal processing system obtains the position of the light spot. Two photosensitive element groups with converging lenses are easy to set at the corners of the protective plate, which can effectively reduce blind spots.

The strip-shaped light source may be a strip-shaped light source formed by arranging a plurality of small sub-light sources, or may include a strip-shaped light source.

When the touch panel is not touched by the touch element, the light received by the photosensitive element is weak, and the light intensity on the touch panel is relatively uniform, and there is no light spot; when the touch panel is touched by the touch element, the light forms a light spot on the touch panel . The light spot moves with the movement of the touch piece, so that the touch operation of the touch piece on the optical touch screen is realized through information such as the movement of the light spot and the presence or absence of the light spot.

Explain the principle of the light spot formed when the touch piece is in contact with the touchpad, and provide proof:

When the touch piece is far away from the touch panel, only a small amount of light from the touch panel shines on the touch piece, and only a small part of the light is reflected back to the touch panel, and the reflected light is not concentrated and cannot form a light spot , the light touch screen does not respond. When the touch piece is in contact with the touch panel, the light cannot exit the touch panel, and a light spot is directly formed at the contact point between the touch piece and the touch panel. The present invention obtains the position of the light point by comparing the distances from the light point to each photosensitive element in the photosensitive element group, even if the area of the light point is large, it does not affect the determination of the position by the optical touch screen.

A simple empirical test is used to prove the correctness of the above principle: in a dark night, in a brightly lit room, things outside the glass window can hardly be seen, and the glass of the glass window is like a mirror. Suppose there is a person outside the glass window. When he is far away from the glass window, even if the light from the glass window can reach the person, we cannot see him. This proves that the light from the glass window is rarely reflected back. When he presses the tip of his nose against the glass, we will see that the tip of his nose is very bright, forming a point of light, and the rest of the face darkens sharply as the distance from the glass increases.

Comparing the above-mentioned simple empirical test with the present invention: make the strip light source generate an optical signal with a certain flicker frequency, and the frequency selection module of the signal processing system only selects the electrical signal related to the flicker frequency of the strip light source, that is, the optical touch screen The system only recognizes the light generated by the strip light source. Compared with the optical touch screen, the outside of the touch panel is dark, which is all consistent with the conditions in the above empirical test. Therefore, the tip of the nose can be compared to the touch piece, the glass of the glass window can be compared to the touchpad, and the photosensitive element can be compared to the eyes, which proves that a light point will be formed when the touchpiece touches the touchpad.

When multiple strip light sources emit light at the same time, the light emitted by the touch panel is difficult to be uniform, which may affect the determination of the position of the light point.

The problem that the light is difficult to be uniform can be solved in this way. The optical signal emitted by a strip light source is converted into a corresponding electrical signal by the corresponding photosensitive element and sent to the signal processing system. The signal processing system uses the corresponding electrical signal as the Information about the position of the light spot on the touchpad. The photosensitive element corresponding to other strip light sources cannot transmit the light signal emitted by this strip light source to the signal processing system, or the photosensitive element corresponding to other strip light sources can transmit the light signal emitted by this strip light source to the signal processing system processing system, but the signal processing system does not use the corresponding electrical signal as information related to the position of the light spot on the touch panel.

Specifically, the following method can be adopted to solve the problem that the light is difficult to be uniform: the plurality of strip-shaped light sources are alternately lit, and when one of the strip-shaped light sources is not lit, the electrical signal output by the corresponding photosensitive element group is not received. When a strip light source is turned on, the electrical signal output by the corresponding photosensitive element group is received and processed by the signal processing system. In this way, each photosensitive element group receives the light emitted by a strip light source, and the light emitted by a strip light source is easy to be evenly projected on the touch panel.

Specifically, the following method can be used to solve the problem that the light is difficult to be uniform: a plurality of strip light sources are provided with photosensitive elements corresponding to each strip light source; each strip light source has a flicker frequency with a large difference; Each photosensitive element is connected to a frequency selection module corresponding to the flicker frequency of the strip light source.

(3) The optical touch screen itself has a light source, and the external devices that match the optical touch screen also have a light source:

In order to realize that the optical touch screen itself has a light source, and the external device that is matched with the optical touch screen also has a light source, as long as the optical touch screen with its own light source is equipped with a device with a light source that is used in conjunction with the optical touch screen, it can have two modes at the same time. Turn off the light source of the optical touch screen itself, and the optical touch screen is a mode in which the optical touch screen itself does not have a light source; turn on the light source of the optical touch screen itself, and the optical touch screen is a mode in which the optical touch screen itself has a light source.

2. Optical touch screen for remote touch

Required for use with devices that work with remote touch optical touch screens. A companion device, such as a remote stylus.

The remote touch pen includes a laser, a power supply, and a hand-held casing, the laser and the power supply are arranged in the casing, a switch is arranged between the laser and the power supply, and the switch is arranged on the casing.

Further, the remote touch pen also includes a signal generating module, the power supply is connected to the signal generating module, the signal generating module is connected to a laser, the signal generating module generates an oscillating electrical signal, and drives the laser to emit a flashing laser signal corresponding to the electrical signal.

The remote stylus generates a beam of light that forms a spot on the touchpad. The remote touch pen realizes the corresponding remote operation on the light touch screen by remotely controlling the light spot.

The working principle and structure of the optical touch screen of remote touch are basically the same as that of the optical touch screen of contact touch without light source. The key difference is that the remote touch pen can generate a light beam with strong light intensity. A spot of light can be formed on the touch panel. Therefore, by replacing the remote touch pen with a contact touch pen, the optical touch screen of the remote touch can be converted into the optical touch screen of the contact touch, and vice versa. It is easy to convert between the optical touch screen of remote touch and the optical touch screen of contact touch.

The arrangement of the photosensitive elements in the remote touch photosensitive element group is relatively free, and can be arranged in front of the screen or in front of the protective plate.

Both the remote touch pen and the contact touch pen can communicate with the optical touch screen through the flashing light signal, set a password lock system for the optical touch screen, and set a matching electronic key for the signal generation module of the contact touch pen and the remote touch pen system. Lock the optical touch screen system to prevent non-related personnel from operating it.

It can be seen from the above that the optical touch screen described in the present invention does not contact the electronic devices of the optical touch screen itself during use, so the service life is long. The touchpad adopts the original parts of the display and does not take up space. Not only the remote touch is realized, but also the conversion between the remote touch mode and the contact touch mode can be easily realized. The determination of the position of the light point is only related to the position of the light point, and has nothing to do with the light intensity of the light point and whether there is oil on the touch panel. Therefore, it has strong anti-interference ability and is not afraid of oil pollution. It is suitable for places with heavy oil pollution such as factory workshops and mining areas. The optical touch screen of remote touch and the optical touch screen of contact touch can be easily converted, and it is convenient for encryption. Multiple light points are allowed, enabling multi-touch functionality.

Description of drawings

In Figure 1, a is the overall diagram of the touch pen, and b is the electrical schematic diagram of the touch pen;

In Figure 2, a is the overall diagram of the remote touch pen, and b is the electrical schematic diagram of the remote touch pen;

3 is a front view and a side view of a remote touch pen with a ring-shaped fixing structure;

4 is a side view of a remote touch pen with two ring-shaped fixing structures;

5 is a structural diagram of a touch panel provided with two rows of photosensitive elements in Embodiment 1;

Figure 6 is a structural diagram of the filter channel;

In Figure 7, a is a schematic diagram of the connection relationship between the photosensitive element and the signal processing system, and b is a schematic diagram of the connection relationship between the photosensitive element and the signal processing system that improves the resolution of the optical touch screen;

In Figure 8, a is a schematic diagram of horizontal coordinate area division, and b is a schematic diagram of horizontal coordinate area division that improves the resolution of the optical touch screen;

Fig. 9 is a schematic diagram of a block-shaped coordinate area handed over from the horizontal coordinate area and the vertical coordinate area;

FIG. 10 is a schematic structural diagram of a light source arranged on the back of the touch panel;

FIG. 11 is a schematic structural diagram of a light source arranged on the side of the touch panel;

Figure 12 is a schematic diagram of the arrangement of photosensitive elements when the area of the touch panel is large;

Fig. 13 is a schematic diagram of the layout of photosensitive elements on the screen of a large-screen rear projection display in which the touch panel is composed of a plurality of small screens spliced together;

Fig. 14 is a schematic diagram of arrangement of light-sensitive elements on a screen where the touch panel is an LED display;

FIG. 15 is a schematic diagram of coordinate area division using a photosensitive element group equipped with a converging lens in front.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

Because the working principle and structure of the optical touch screen of contact touch and the optical touch screen of remote touch are basically the same, the difference lies in the way of forming the light spot, which includes forming the light spot by the touch pen, The light spot is formed by the remote touch pen, and the light spot is formed by the touch element. The touch element is an object that touches the touch screen. The object may not emit light, and may be a finger, a pen, or the like.

Whether the optical touch screen is directly determined to a large extent whether the optical touch screen is a contact touch optical touch screen or a remote touch optical touch screen .

The specific structures of the contact touch pen and the remote touch pen are as follows.

Referring to a and b in Fig. 1, the contact touch pen includes a pen case 101, a power supply 102, a switch 103 and a light-emitting element 104, the light-emitting element 104 is connected to the power supply 102 through a signal generating module 105 that generates an oscillating electrical signal, and the switch 103 controls light emission The light emission of the element 104. The light emitting element 104 may be a light emitting element that emits visible light, or a light emitting element that emits invisible light. The power supply 102 can also be directly connected to the light emitting element 104 through the switch 103 .

The light-emitting element 104 adopts a light-emitting diode, and the light-emitting diode is located at the contact end between the pen case 101 and the touch panel, and the upper end of the light-emitting diode is against the key of the switch 103 .

When the touch pen is used, the light-emitting diode touches the touch panel, the light-emitting diode is pressed to trigger the key of the switch 103, the light-emitting element emits light, and forms a light spot on the touch panel. The light spot flickers at the frequency corresponding to the signal generating module 105 and the switch 103 . Obviously, the switch 103 can also be a switch in the form of a pressure sensor, or some other known switches with small volume.

Auxiliary keys, such as key 106, can also be added to the touch pen. The signal generating module 105 is configured with a frequency corresponding to the key 106 . When the key 106 is pressed, the light emitting element 104 blinks at a frequency corresponding to the key 106 when the light emitting diode touches the touch panel to turn on the switch 103 . The optical touch screen can respond to the light signal blinking at this frequency as the function of clicking the right button of the mouse. Similarly, a button corresponding to the left mouse button may also be set.

The contact stylus can obviously be integrated with the wireless function and infrared function of the existing laser pointer, such as the function of clicking the right button of the mouse, the function of clicking the right mouse button and the slide page turning function through the wireless function and infrared function.

The power source 102 of the contact stylus may be a charging power source. The pen case 101 is provided with a charging interface, which is convenient for charging the contact stylus.

When the contact stylus is applied to a portable electronic device such as a mobile phone, a handheld computer, a handheld game console, a notebook computer, etc., the portable electronic device is provided with a contact stylus slot, and a charging electrode is provided in the contact stylus slot. , when the touch pen is inserted into the slot of the touch pen, the charging interface is docked with the charging electrode to charge the charging power supply.

The remote stylus is used to generate a beam of light that forms a spot of light on the touchpad. The remote touch pen realizes the corresponding remote operation on the light touch screen by remotely controlling the light spot. With reference to a and b in Fig. 2, the remote touch pen includes a laser 201, a power supply 202, and a housing 203. The housing 203 has a switch portion 204, and the housing 203 has a power supply 202. The power supply 202 is connected to a signal generating module 205, and the signal generating module 205 is connected to the laser. 201. The signal generating module 205 generates an oscillating electrical signal, and drives the laser 201 to emit a blinking laser signal corresponding to the electrical signal, thereby forming a blinking light spot on the optical touch screen. The laser 201 may be a laser that emits visible light, or a laser that emits invisible light.

The switch part 204 is provided with a plurality of buttons, and each button corresponds to a different signal generated by the signal generating module 205, so the remote touch pen can generate a variety of laser signals with different information. The power supply of the remote touch pen can be a charging power supply.

For another structure of the remote touch pen, referring to FIG. 3 , there are two lasers 301 and 302 in total. The laser 301 emits visible light, and the laser 302 emits infrared rays. The light rays emitted by the two lasers 301 and 302 are parallel. Visible light provides visual feedback for people, and infrared light as a signal carrier has better anti-interference performance than visible light.

The signal generation module can generate various electrical signals, and is connected to the switch 303 with three keys, and each key corresponds to an electrical signal. Each electrical signal drives the laser to generate a corresponding laser signal.

The shell 300 of the touch pen has a ring-shaped fixing structure 304 . The touch pen can be fixed on the finger through the fixing structure 304 to generate a light spot following the movement of the finger. The touch pen can be worn on the index finger of the right hand, and the button 303 can be controlled with the thumb. Because people are usually used to pointing and gesturing with the right index finger. The index finger of the right hand has a good sense of direction, and pistols have always been designed to take advantage of this.

Another structure of the remote touch pen, referring to Figure 4, in order to make people more comfortable to use, the following changes are made on the shell, the shell is provided with two ring-shaped fixed structures 401, 402, and the two fixed structures 401, 402 They are connected by wires 403. The fixed structure 401 is equipped with a laser emitting infrared rays, and the other fixed structure 402 is equipped with a switch 404, a power supply, a signal generating module, and a signal amplifying module.

When in use, the fixed structure 401 equipped with the laser is worn on the index finger, the fixed structure 402 equipped with the switch is worn on the middle finger, the light direction of the laser is towards the fingertip, and the button of the switch 404 is towards the thumb. The button of the switch 404 is controlled with the thumb, and the laser emits laser light in the direction pointed by the index finger. The movement of the index finger drives the laser movement, and then manipulates the movement of the light spot.

Obviously, the remote touch pen can also be integrated with the wireless function and infrared function of the existing laser pointer, such as realizing the function of clicking the right mouse button, clicking the right mouse button and turning pages of slides through the wireless function and infrared function.

For the present invention, the optical touch screen is divided into the optical touch screen of contact touch and the optical touch screen of remote touch simply according to the formation method of light spots, which is convenient for brief description, but not convenient for detailed explanation. The following is mainly based on the different types of the selected touch panels, and the arrangement method of the photosensitive element on the touch panel for classification and detailed explanation.

In the present invention, when the protective plate is used as the touch panel, the installation method of the photosensitive element has a high degree of freedom, and the generation method of the light spot also has the highest freedom. Therefore, the protective plate is firstly used as the touch panel for illustration. In addition, on the basis of the structure and principle of the optical touch screen using the protective plate as the touch panel, the optical touch screen using other objects as the touch panel can be easily obtained. The optical touch screen with other objects as the touch panel will be described later on the basis of the optical touch screen with the protective plate as the touch panel.

Specific embodiment one, take the light-transmitting protective plate in front of the screen as the touch panel:

The following content focuses on the case where the photosensitive element group is not provided with a converging lens. For the case of replacing it with a photosensitive element group provided with a converging lens, it has already been described above, and will not be explained in detail.

The photosensitive element group is arranged around the touchpad. Around the touchpad, including the front, rear, and sides along the sides of the touchpad. Specifically, referring to FIG. 5 , a photosensitive element group 502 composed of a row of horizontally arranged photosensitive elements is arranged above the touch panel 501 , and a photosensitive element group 503 composed of a row of vertically arranged photosensitive elements is arranged on the left side. The photosensitive element group 502 and the photosensitive element group 503 can be arranged in front of the touch panel 501 , behind the touch panel 501 , or buried inside the touch panel 501 in advance.

The photosensitive element is a photosensitive element with a narrow applicable wavelength range, which uses the selectivity of the photosensitive element itself to the wavelength of the optical signal to eliminate the interference of other wavelength optical signals. If you can choose ultraviolet photosensitive element, infrared photosensitive element.

In this embodiment, the photosensitive element group 502 and the photosensitive element group 503 use infrared photosensitive elements, such as infrared photodiodes, infrared photosensitive triodes, photosensitive element integrated blocks, or image sensors.

The filter glass on the front covers of the photosensitive element group 502 and the photosensitive element group 503 can further effectively eliminate the interference of other wavelength optical signals. Referring to FIG. 6 , a light-shielding structure may also be provided on the photosensitive element group, and the light-shielding structure is used to shield light coming from non-related directions. The non-relevant direction refers to a direction not related to the control of the optical touch screen, and generally refers to a direction other than facing the touchpad. For the above purpose, the light-shielding structure can be flexibly designed, which can be a simple light-shielding sheet located above or below the photosensitive element, or a more complex structure.

For a more complicated structure, for example, the light-shielding structure adopts a filter channel 600, and the light-sensitive element group is covered with a light-filter channel 600 made of a material with poor light transmission, which is used to filter out the light incident on the photosensitive element other than the touch panel 501 . For example, the filter channel can be made of opaque plastic material. The filter channel 600 is provided with an elongated light-transmitting opening 601 , and the photosensitive element group 502 is arranged at a certain distance from the light-transmitting opening 601 .

The light-transmitting opening 601 slightly faces the touchpad 501 . The angle between the direction of the light transmission port 601 and the touch panel 501 decreases with the increase of the width of the touch panel 501 in the direction of the light transmission port 601, so that the optical signal of the largest possible area on the touch panel 501 or even the entire area can be received. Light signal on touchpad 501. The light on the touch panel 501 passes through the light transmission opening 601 to reach the photosensitive element group 502 . Most of the light outside the touchpad 501 is blocked by the filter channel 600 . Filter glass can be installed on the light transmission port 601 .

With reference to Fig. 5, utilize the photosensitive element group 502 that is contained in the photosensitive element group 502 that a row of horizontally arranged photosensitive element is contained in the touch panel top to determine the abscissa of light point; The element group 503 determines the ordinate of the light point, and then determines the position of the light point on the touch panel through two rows of photosensitive elements.

The method for determining the one-dimensional coordinates of a light spot in a row of photosensitive elements is described as follows by taking the photosensitive element group 502 arranged horizontally as an example:

Referring to a in Fig. 7, the photosensitive elements of the horizontally arranged photosensitive element group 502 are sequentially numbered as photosensitive elements 000, 001, 010, 011, and 100, respectively connected to the frequency selection module 700, and the output terminals of the five frequency selection modules 700 The difference seeking module 701 is connected, and the difference seeking module 701 includes 4 operational amplifiers 702, and the electrical signals output by the 5 frequency selection modules 700 are sequentially calculated in pairs.

The output terminal of the operational amplifier 702 is connected to the microprocessor system 703, and the microprocessor system 703 converts the output signal of each operational amplifier 702 into a corresponding digital signal.

The microprocessor system 703 takes the electrical signal generated when the photosensitive element connected to the left side of each operational amplifier 702 receives a strong light intensity as "1", and vice versa as "0", and arranges the data in order from left to right . Further, the area where the light spot is located is divided into coordinate areas 1111, 0111, 0011, 0001, and 0000 as shown in a in FIG. 8 .

Improvements in the resolution of optical touch screens can obviously be achieved by increasing the number of photosensitive elements. Referring to Figure b in Figure 7, the improvement of the resolution of the optical touch screen can also be achieved by increasing the number of operational amplifiers 702, and again calculating the difference between the electrical signals generated by the photosensitive element groups 502 in phases, so as to further subdivide the coordinate area to achieve The effect of increasing the resolution. For the coordinate area 1111, 0111, 0011, 0001, 0000 shown in Figure 8a, it is further subdivided into the coordinate area shown in Figure 8b, which is 11111, 11110, 01111, 01110, 00111, 00110, 00011, 00010, 00001, 00000.

Improving the resolution of the optical touch screen can also be achieved by performing A/D conversion on the electrical signal strength generated by each photosensitive element, converting it into digital information and comparing it with each other. Its principle is similar to the above-mentioned principle realized by integrated op amp, the difference is that one is compared by hardware, and the other is compared by software.

Referring to Fig. 9, the area divided by the photosensitive element group 502 arranged horizontally and the area divided by the photosensitive element group 503 arranged vertically intersect to form a square coordinate area, and each square coordinate area represents different digital information . When the light spot is located in a square coordinate area, the optical touch screen reflects the digital information represented by the square coordinate area to obtain the position of the light spot.

The above methods are limited by hardware facilities, and the resolution can easily reach the limit. Referring to b in FIG. 8 , a method for improving resolution by using analog quantities is described.

The method of using analog to improve resolution is based on the hardware device shown in b in Figure 8, and the resolution is improved through software.

The method of using software to improve the resolution is based on the following idea: when the light spot moves on the touch panel 501, its light intensity changes smoothly. element, the reflected light intensity difference changes as β, then when crossing the coordinate area 01111 adjacent to the coordinate area 11110 in the lateral direction, the two photosensitive elements arranged horizontally corresponding to the coordinate area 01111 reflect the light intensity difference The change is Φ, Φ=β+Δ, and Δ is negligible.

由于Δ可忽略不计，通过上述方法可以将坐标区域01111划分为n份，即将01111的横坐标上的分辨率增加n倍。当光点由坐标区域01111，进入相邻的坐标区域，如坐标区域01110、坐标区域00111，则以光点在跨越坐标区域01111时的光线强度差值变化Φ为参考。再假设纵坐标轴上的倍增系数也为n，则整个光触摸屏的分辨率将提高为原有的n²倍。Set the multiplication factor on an abscissa axis as n, and the abscissa length of a coordinate area as l. When the light spot is located in the coordinate area 01111, the light intensity difference change β when the light point crosses the coordinate area 11110 is used as a reference. For the two photosensitive elements arranged horizontally corresponding to the coordinate area 01111 in the coordinate area 01111, the reflected light intensity changes every time Think of the light point as moving on the abscissa

Since Δ is negligible, the coordinate region 01111 can be divided into n parts by the above method, that is, the resolution on the abscissa of 01111 is increased by n times. When the light spot enters the adjacent coordinate area from the coordinate area 01111, such as the coordinate area 01110 and the coordinate area 00111, the light intensity difference change Φ when the light point crosses the coordinate area 01111 is used as a reference. Further assuming that the multiplication factor on the ordinate axis is also n, the resolution of the entire optical touch screen will be increased to ² times of the original n.

It is summarized as follows: the optical touch screen includes a row of photosensitive elements, and the row of photosensitive elements divides the touch panel into a plurality of coordinate areas according to their positional relationship; the signal processing system records that the light spot moves from one side of the original coordinate area The light intensity difference caused by going to the other side is set to β; when the light point moves to the adjacent coordinate area, compare the change of the light intensity in the adjacent coordinate area with β, and compare the width of the adjacent coordinate area with the width of the original coordinate area relationship, determine the position of the light point on the adjacent coordinate area.

The measurement and calculation of the above-mentioned difference in light intensity can be performed by first converting the difference in light intensity into digital information through A/D conversion, and the digital information is processed by the microprocessor system through software according to the above-mentioned formula and method.

With reference to Fig. 15, for the photosensitive element group 502 and the photosensitive element group 503 that are made up of rows of photosensitive elements shown in Fig. 8 and Fig. 9, two photosensitive element groups that are equipped with a converging lens 510 and a converging lens 520 can be used. 502 and photosensitive element group 503 instead. The signal processing system corresponds to a signal processing system that obtains the position of the light spot through the angular relationship between the light spot and the photosensitive element group 502 and the photosensitive element group 503 . Both signal processing systems mentioned in the present invention can determine the position of the light spot by judging the information including the intensity information of the electric signal related to the light spot generated by the plurality of photosensitive elements on the photosensitive element group. Determining one or several photosensitive elements that generate the strongest relative electrical signal intensity is the key to determining the position of the light spot. Therefore, the conclusions of the above-mentioned method of using software to improve resolution are also applicable to a signal processing system that obtains the position of the light spot through the angular relationship between the light spot and the photosensitive element group. When the signal processing system obtains the position of the light spot through the angular relationship between the light spot and the photosensitive element group 502 and the photosensitive element group 503, then it analyzes the difference relationship of the optical signal intensity on the photosensitive elements in the photosensitive element group, which is helpful Improve accuracy. When specifically using the signal processing system, change the reference coordinates to polar coordinates, and then correspond the corresponding coordinate values with relevant information in the microprocessor system to obtain the required signal processing system. Therefore no further details will be given.

You can use a remote touch pen or a contact touch pen for use. Regarding the difference between the two touch pens in the present invention, the focus lies in the different ways of generating light spots.

When a touch pen is used, if the touch panel 501 is placed flat on the desktop, only when the tip of the touch pen touches the touch panel 501 will a response be generated. The effect is comparable to writing on paper.

The following designs enable this embodiment to be operated with non-luminous touch elements:

In this embodiment, if non-luminous touch elements are used for operation, it is necessary to add a set of optical touch screen light sources. The light source of the optical touch screen light source can irradiate the touch panel 501 uniformly from the back or side of the touch panel 501 . The light generated by the light source is uniformly emitted from the front of the touch panel 501 .

A touch piece is used to touch the touch panel 501, and the touch piece is irradiated by the light generated by the light source to form a light spot. The touch piece is an object that touches the touchpad 501 , and may be a finger, a pen, or the like.

The light spot moves with the movement of the touch piece, and the touch operation of the touch piece on the optical touch screen is realized through information such as the movement of the light spot, the presence or absence of the light spot, and the flickering frequency of the light spot.

Referring to FIG. 10 , the light source 101 a can be arranged on the back of the touch panel 501 ; referring to FIG. 11 , the light source 101 b can also be arranged on the side of the touch panel 501 .

Referring to FIG. 10 , the light source 101a is two strip light sources. The strip light source may include a strip light source, or a strip light source formed by a plurality of small sub-light sources. It is arranged on the back of the touchpad 501 , and the irradiation direction is slightly toward the front of the touchpad 501 . The photosensitive element group 502 and the photosensitive element group 503 are arranged on the back of the touchpad 501 , and the photosensitive surface slightly faces the front of the touchpad 501 . Try not to make the photosensitive surfaces of the photosensitive element group 502 and the photosensitive element group 503 be directly irradiated by the light source 101a.

Referring to FIG. 11 , the light source 101b is two strip light sources. The strip light source may include a strip light source, or a strip light source formed by a plurality of small sub-light sources. It is installed on the side of the touchpad 501, embedded in the protective plate (touchpad 501), and the irradiation direction is slightly towards the front of the touchpad 501. The photosensitive element group 503 and the photosensitive element group 502 (not shown in FIG. 11 ) are arranged on the side of the touch panel, embedded in the protective plate (touch panel 501 ), and the photosensitive surface faces slightly towards the front of the touch panel 501 . Try not to make the photosensitive surfaces of the photosensitive element group 502 and the photosensitive element group 503 be directly irradiated by the light source 101b.

When the two strip light sources in FIG. 10 and FIG. 11 emit light at the same time, the light emitted by the touch panel 501 is difficult to be uniform, which will affect the determination of the position of the light point.

The following method is used to solve the problem that the light is difficult to be uniform. The two strip light sources are alternately lit. When the strip light sources are lit, the electrical signals output by the corresponding row of photosensitive elements are not received. In this way, each row of photosensitive elements only receives the light emitted by the corresponding strip light source, and the light emitted by a strip light source is easy to be evenly projected on the touch panel, thereby solving the above-mentioned problem.

The following method can also be used to solve the problem that the light is difficult to be uniform. The two strip light sources respectively select flicker frequencies with a large difference, and the corresponding two rows of photosensitive elements are respectively connected to the frequency selection modules corresponding to the flicker frequencies of each strip light source. Thereby, the above-mentioned problems are solved.

Referring to FIG. 10 and FIG. 11 , when the touch member is not touching the touch panel 501 , only a small portion of the light generated by the light source 101 a or 101 b irradiates the photosensitive element group 502 and the photosensitive element group 503 . Since no light spot is formed, the light received by the photosensitive element group 502 and the photosensitive element group 503 is uniform, and the operational amplifier cannot compare the obvious difference of the light received by each photosensitive element, and the reaction is that no touch event occurs.

When the touch piece touches the touchpad 501, a light point is generated on the touchpad 501, and the light generated by the light source 101a or 101b is reflected back, and the light has diffuse reflection in the reflection, and irradiates the photosensitive element group 502 and the photosensitive element group 503. The light received by each photosensitive element is uneven, and the operational amplifier responds to a corresponding touch event by comparing the difference of the light received by each photosensitive element.

The following design solves the potential problem when the present embodiment adopts a larger protective plate as a touch panel:

Referring to FIG. 12 , when the area of the touchpad 501 is large, the photosensitive element group may not be able to receive the signals of the light spots on the touchpad 501 well. In order to solve the above-mentioned problems, the design described in FIG. 12 is adopted, and a touch panel 501 is divided into four sub-touch panels 12a, 12b, 12c, 12d by installing photosensitive elements around the touch panel 501. By uniformly coding the groups of photosensitive elements on the four sub-touch panels, the four sub-touch panels are integrated to improve sensitivity.

The following design is used to solve the system security problem of this embodiment:

Referring to Figure 1b, Figure 2, Figure 3, and Figure 4, both the contact touch pen and the remote touch pen can be equipped with a signal generating module, and the electrical signal generated by the signal generating module is converted into an optical signal and sent to the optical touch screen. A combination lock system is set for the optical touch screen, and a supporting electronic key system is set for the signal generation module of the contact touch pen and the remote touch pen. The optical touch screen can only be operated by the supporting contact touch pen and remote touch pen, which is beneficial to system security.

In order to increase the versatility of the touch pen and the remote touch pen, that is, to enable one touch pen or remote touch pen to operate multiple optical touch screens, the signal generating module can contain multiple sets of unlocking information. The contact stylus or remote stylus sends optical signals carrying multiple sets of unlocking information to the optical touch screen, and one set of unlocking information meets the unlocking requirements of the optical touch screen to complete the unlocking.

The set of unlocking information may be digital information contained in a carrier wave, or may be a signal oscillating at a specific frequency.

When in use, the contact touch pen and the remote touch pen continuously send light signals carrying multiple sets of unlocking information to the optical touch screen to generate light spots. In the optical touch screen, the light points generated by light signals carrying multiple sets of unlocking information are related light points.

For the convenience of use, the multiple sets of unlocking information contained in the signal generating module should be convenient for users to update by themselves. Therefore, the signal generating module should be equipped with a function of editing unlocking information in a timely manner, and this function can be realized by connecting the signal generating module to a flash memory.

Specific embodiment two, take the screen of rear projection type display as touchpad:

1 to 9, the optical touch screen uses the screen of the rear projection display as the touch panel 501 and the protective plate as the touch panel 501, and the structure and principle are basically the same.

One of the differences is that if the screen of the rear-projection display is not a transparent medium, the light cannot be transmitted in an orderly manner inside the screen of the rear-projection display, so it is not convenient to operate with non-luminous touch elements.

The second difference is that the screen of the rear-projection display is generally large, and further design is required to ensure that the light signal emitted from the light spot can be received smoothly.

The screen of the existing large-screen rear-projection display is generally formed by splicing a plurality of small screens. Referring to FIG. 13, the screen (touch panel 501) of the large-screen rear projection display is composed of four small screens 13a, 13b, 13c, and 13d. Depending on the small screens 13a, 13b, 13c, and 13d as sub-touch panels, each sub-touch panel adopts the structure shown in Figure 12, and each sub-touch panel is divided into 4 small sub-touch panels, so that the touch panel 501 Divided into 16 sub touchpads.

The photosensitive element is arranged on the back of the screen (touch panel 501 ) of the large-screen rear projection display, so as not to affect the visual effect.

Specific embodiment three, take liquid crystal display screen or cathode display tube display (CRT) screen as touch panel:

With reference to Fig. 1 to Fig. 9, and Fig. 11 and Fig. 12, optical touch screen is touch panel 501 with liquid crystal display screen or is touch panel 501 with cathode display tube display (CRT) screen, and is touch panel 501 with protective plate, structure and The principle is basically the same.

The difference: The difference between the LCD screen and the cathode display tube display (CRT) screen relative to the protective plate is that the light transmission between the front and rear sides of the LCD screen and the cathode display tube display (CRT) screen is not good. That is, light does not easily penetrate liquid crystal display screens and cathode display tube display (CRT) screens. The photosensitive element group 502 and the photosensitive element group 503 are suitably arranged on the side or front of the touch panel 501 .

When this embodiment is implemented to operate with a non-luminous touch element, it is not suitable to use the structure shown in FIG. 10 , and it is suitable to use the structure shown in FIG. 11 .

Specific embodiment four, take the screen of LED display as touch panel:

Referring to Fig. 1 to Fig. 9, and Fig. 12, the optical touch screen uses the screen of the LED display as the touch panel 501 and the protective plate as the touch panel 501, and the structure and principle are basically the same.

One of the differences, the difference between the screen of the LED display and the protective plate is that the light transmission between the front and rear sides of the screen of the LED display is not good, that is, the light is not easy to penetrate the screen of the LED display. The photosensitive element group 502 and the photosensitive element group 503 are suitably arranged in front of the touch panel 501 .

With reference to Fig. 14, the screen of most LED display is made up of a large amount of single LED 141, and photosensitive element group 502, photosensitive element group 503 can also be arranged between a large amount of single LED 141, promptly photosensitive element is embedded in the touch panel. Since the photosensitive element group 502 and the photosensitive element group 503 are small in volume, and the transparency will not affect the visual effect. The photosensitive element group 502 and the photosensitive element group 503 are arranged between a large number of single LEDs 141, which is convenient to increase the number of the photosensitive element group 502 and the photosensitive element group 503, thereby increasing the accuracy of the optical touch screen. In order to facilitate receiving light signals, the height of the photosensitive surfaces of the photosensitive element group 502 and the photosensitive element group 503 should be higher than that of a single LED 141.

For other transparent touchpads in front, also can adopt the structure that photosensitive element is embedded in touchpad inside, as the liquid crystal display screen of large screen, photosensitive element group 502, photosensitive element group 503 also can be embedded in the liquid crystal of the large screen as touchpad. inside the monitor screen. Since the photosensitive element group 502 and the photosensitive element group 503 are small in volume, and the transparency will not affect the visual effect. Such a structure is more compact and stable.

The second difference is that light cannot be transmitted in an orderly manner inside the screen of the LED display, so it is inconvenient to operate with non-luminous touch elements.

Specific embodiment five, using the projector screen as a touch panel:

Referring to FIG. 1 to FIG. 9 and FIG. 12 , the optical touch screen uses the projector screen as the touch panel 501 and the protective plate as the touch panel 501 , and the structures and principles are basically the same.

The difference is that the projector screen is not a transparent medium, and the light cannot be transmitted in an orderly manner inside the screen of the rear-projection display, so it is not convenient to operate with non-luminous touch elements. The photosensitive element group 502 and the photosensitive element group 503 are suitably arranged in front or behind the projector screen.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned method of use. The above-mentioned method of use and description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. optical touch screen, comprise touch pad, signal processing system, also comprise the light activated element group, described light activated element group comprises a plurality of light activated elements, a plurality of light activated elements connect signal processing system, and the light activated element in the light activated element group is connected by light with touch pad;

When using optical touch screen, present a relevant luminous point on touch pad, light activated element is subjected to the irradiation from the light of described luminous point, is reflected as relevant electric signal.

2. optical touch screen according to claim 1, it is characterized in that: described light activated element group is subjected to the irradiation from the light of described luminous point, be reflected as relevant electric signal, the intensity of described electric signal and light activated element are to the distance dependent of described luminous point, the electric signal that light activated element produces is sent to signal processing system, signal processing system obtains the positional information of described luminous point on touch pad by the information that comprises intensity of a plurality of electric signal of analyzing a plurality of light activated elements and producing.

3. optical touch screen according to claim 1, it is characterized in that: described optical touch screen comprises a plurality of light activated element groups, described light activated element group the place ahead is provided with a plus lens, converge on the light-sensitive surface of described light activated element group by the light of plus lens luminous point, the electric signal that produces on the described light activated element group, relevant with luminous point with respect to the angle of described light activated element group, signal processing system is by the information that comprises intensity of a plurality of electric signal of analyzing a plurality of light activated elements and producing, obtain the positional information of described luminous point on touch pad, described light activated element group is arranged in around the described touch pad.

4. optical touch screen according to claim 3, it is characterized in that: described signal processing system is handled the electric signal that produces on the described light activated element group, with in the electric signal with the information of distance dependent and with angle relevant information carry out overall treatment, obtain the positional information of described luminous point on touch pad.

5. optical touch screen according to claim 3 is characterized in that: signal processing system comprises a frequency-selecting module corresponding with described luminous point flicker frequency.

6. according to claim 1,2,3,4 or 5 described optical touch screens, it is characterized in that: described optical touch screen comprises row's light activated element, and described row's light activated element is divided into a plurality of coordinates regionals according to its position relation with touch pad; Signal processing system writes down described luminous point and moves by side to the light intensity difference that opposite side causes from a former coordinates regional one and be made as β; When luminous point moves to the adjacent coordinates zone, adjacent coordinates zonal ray Strength Changes situation and β are compared, and, determine the position of luminous point on the adjacent coordinates zone according to adjacent coordinates peak width and former coordinates regional width relation.

7. optical touch screen light source comprises a light source, it is characterized in that: the light that described light source produces is radiated at outside surface more uniformly to be had on the touch pad of transparent medium, and to touch pad outside transmission, the light that described light source produces is the light with flicker frequency.

8. optical touch screen light source according to claim 8 is characterized in that: described light source, comprise a plurality of strip light sources, and a plurality of strip light sources are alternately lighted; With each strip light source to the deserved light activated element that is provided with, during a strip light source igniting, the electric signal of corresponding with it light activated element output is received and handles by signal processing system.

9. the contact felt pen is characterized in that, comprises switch and light-emitting component, the luminous situation of switch control light-emitting component; Switch is connected with the touch end of contact felt pen, touches end trigger switch when touching touch pad, and light activated element is luminous, forms luminous point on touch pad.

10. the remote touch pen comprises laser instrument, power supply, it is characterized in that, also comprises a shell of being convenient to hand, and described laser instrument, power supply setting are provided with switch between described laser instrument and described power supply in the enclosure, and described switch is arranged on the described shell.

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