WO2011060590A1

WO2011060590A1 - Multi-point touch control apparatus and detection method

Info

Publication number: WO2011060590A1
Application number: PCT/CN2009/075273
Authority: WO
Inventors: 陈伟山
Original assignee: Chen Weishan
Priority date: 2009-11-20
Filing date: 2009-12-02
Publication date: 2011-05-26

Abstract

A multi-point touch control apparatus and detection method, the apparatus includes a touch control panel, at least three infrared ray transmitters (11) set on at least three corners of the touch control panel, and infrared ray inductive devices (12) set on the sides of the at least three touch control panels, each have an inductive side (15) formed by the side of the touch control screen of the infrared ray inductive device (12), and the ray (14) transmitted by each of the infrared ray transmitters (11) can be induced by two opposite inductive sides (15). The coordinate position of a touch control point on the screen can be judged through an intersection of the straight lines of the light path from each of light source and with various slopes and different directions, thus, the touch control point can be judged accurately to avoid mis-judgement.

Description

Multi-touch device and detection method

The present invention relates to a touch device, and more particularly to a multi-point touch device, which can realize a multi-point control operation at the same time. Background art

Multi-touch technology refers to the use of resistors, capacitors, infrared light or infrared lasers to judge multiple (two or more, not including two) contacts of the screen together with the computer system, and execute the corresponding commands. A control technology whose purpose is to replace the original single-touch method with more than two contacts.

Multi-touch can not only completely replace single-touch, but also has a better human interface, and can even do things that mouse and single-touch cannot do.

Currently, an infrared multi-touch device uses FTIR (Frustrated Total Internal).

Reflection), that is, the suppression of total internal reflection technology. As shown in Fig. 1, the light beam emitted by the LED (Light Emitting Diode) illuminates the inside of the screen from the cross section of the touch screen and reflects between the surface layers. If the surface of the screen is air, when the angle of the incident light meets certain conditions, the light is completely reflected on the surface of the screen. However, if a substance with a high refractive index (such as a finger) is pressed against the acrylic panel, the condition of total reflection on the surface of the screen is broken, and part of the beam passes through the surface and is projected onto the surface of the finger. The uneven finger surface causes the beam to scatter (diffuse reflection), and the scattered light forms a bright spot. After passing through the touch screen, it reaches the photoelectric sensor, and the photoelectric sensor converts the light signal into an electrical signal, and the system obtains the corresponding touch information.

The other way (infrared light blocking technology) uses light mainly in infrared light. FIG. 2 is a schematic structural view of an application of the technology, in which infrared light is used as incident light, and four sides of the screen are divided into two corresponding parts, one part is installed with an infrared transmitting tube, and the other part is provided with an infrared receiving tube, and infrared The infrared light emitted by the launch tube is received by the opposite infrared receiving tube. When the finger touches the screen, such as point A, point B', the surface of the uneven finger causes the light beam to scatter, forming a bright spot, and judging the position of the pressing by judging the bright spot, this way can judge single point and not located Contacts on the same horizontal or vertical line, but for points on the same horizontal or vertical line, such as points A and B, points B' and A', points A and B, B' and A' Points have a coordinate that is repeated, which can cause Judgment, or misjudgment.

To this end, an improved method is proposed, which uses the characteristics of the touch points of point A and point A, point B and point B, to make time judgments, thereby avoiding false positives, but this is only for point A and A' point, B point and B' point are different when touched. If a simultaneous touch occurs, misjudgment cannot be avoided. For more than two touch points, that is, multi-touch control formed by three or more touch points, the above method is obviously impossible to implement.

Patent application 200810183426.X proposes an infrared laser multi-touch device, which uses a laser as a light source, an infrared laser emitting element emits a laser to illuminate a finger, generates a bright spot, and the camera receives the laser as an infrared laser receiving component, and simultaneously on the liquid crystal display The touch panel is mounted as a trigger device, the touch panel is mounted on the liquid crystal display, and the camera is mounted on the back of the liquid crystal display, so that the bright spots generated by the light shining on the finger can be accurately determined. The shortcoming of this application is that the highlights must still be judged, and the infrared laser emitters disposed at the four corners of the liquid crystal display must be simultaneously activated to accurately determine the bright spots.

Therefore, people have provided another new way of judging to avoid the defects caused by bright spots, that is, two cameras are arranged at the upper two ends of the screen, and the reflective strips are installed on the lower two sides and the bottom side, and the camera is passed through the camera. Determine the angle of the emitted light by the length and position of the dark strip projected on the light bar by the touch point, and determine the position of the touch point by the angle obtained by the two cameras. This method does not judge the touch point through the bright point. However, it is judged by the projection angle, which avoids the misjudgment formed by the touch points on the horizontal line or the vertical line, but there are still problems of misjudgment at multiple points on the same projection line.

Another way is to set up a sensor at the corresponding position of each pixel, such as TMD is using low temperature polysilicon (LTPS) technology to develop a light-sensing multi-touch panel with embedded sensors. The main method is to embed a light sensor in each pixel of the LTPS-TFT panel. When a finger or a light pen touches the screen, some of the light is blocked. At this time, the position of the contact can be sensed and measured by the light sensor. Since the technology senses the position of the touch point by embedding the light sensor in the pixels of the liquid crystal panel, it is possible to simultaneously detect a plurality of contacts and realize the function of multi-touch, but the requirements of the components are required. Very high, and the light sensor's corresponding pixel setting makes the cost very high, especially when judging the touch point of a small area, it must be designed based on a very small light sensor, so this method is very expensive. . Summary of the invention Based on this, the primary objective of the present invention is to design a multi-touch device which is simple in structure, low in cost, and easy to manufacture and implement.

Another object of the present invention is to provide a multi-touch device that is widely applicable to liquid crystals and other touch screens.

A further object of the present invention is to provide a multi-touch device that can be applied to any touch screen to form a touch structure, and the device can accurately and reliably determine the touch point.

Based on this, the present invention is implemented as follows:

A multi-touch device characterized in that the device comprises:

a touch panel,

At least three infrared light emitters are disposed on at least three corners of the touch panel, and at least three sides of the touch panel are provided with infrared light sensing devices, and sides of the touch screen each having the infrared light sensing device are formed Inductive edge,

And each of the infrared light emitters, the emitted light can be induced by two opposite sensing edges. After the infrared light is irradiated to the infrared receiving component, an induced current signal is generated, which is amplified and recognized and sent to the computer system.

The idea of the invention is: the coordinates of different points on one plane can be determined by the illumination of a plurality of rays, but the illumination of the light has coverage, that is, when a light is irradiated, the front point will block the latter point. The previous point covers the back point, so you can't judge the coordinates of the back point. Therefore, for multi-point judgment, it is necessary to illuminate from three or more different angles to exclude the occluded light, so that the touch point can be judged by the light, that is, the intersection of a plurality of straight lines with different slopes can determine a plurality of different Touch the point. Through this principle, the present invention changes the way of judging the touch point, and changes the straight line intersecting between the two directions of the vertical and the orthogonal directions to detect the touch point by the intersection of the straight lines of the plurality of directions and the plurality of slopes. The light from the infrared source of three or four corners or more positions forms a straight line with each of the infrared receiving elements on the opposite side, and the plurality of touch points block the light, so that the corresponding receiving element has no induced current, and is determined by the same The blocked light path is straight. The coordinate position of the touch point on the screen is determined by the intersection of the blocked light path lines from different light sources and different directions from each light source. The more the number of light sources, the larger the difference in the angle of the formed optical path, and the more the number of touch points is correctly determined. This will enable accurate judgment of the touch points and avoid false positives. Therefore, the device can accurately judge multi-touch. The infrared light emitter may be an infrared LED, or an infrared laser or the like, and the light emitted by the infrared LED or the infrared laser component passes through the optical lens, so that the light forms a uniform fan surface on the screen surface. It can be uniformly irradiated onto the infrared light sensing device.

The touch panel is a touch screen, a transparent plane body, or any one of the display screens that can be displayed in a plane; when the screen is not used, the touch panel may include a transparent plane object, Achieve protection against scratch-free displays. In the touch panel used in the present invention, there is no need to be specifically limited to the touch screen, which may be a touch screen, a display, or a protective layer mounted on the display, which can realize the judgment of the touch point.

The infrared light sensing device is a combination of more than one infrared light sensing device, that is, the infrared light sensing device includes more than one infrared light sensing device, and the infrared light sensing device has a parallel structure, when the light is When the infrared light sensing element is irradiated, the irradiated infrared light sensing element generates an induced current signal, and the light sensing element not irradiated by the light does not generate an induced current signal, forming an area without a sensing signal, and the resistance obtained by the processed current signal is obtained. The off state signal is sent to the computer for processing.

The above infrared light sensing member is a photodiode, an infrared receiving diode, or the like. Moreover, the infrared light sensing element can be selected and arranged according to the actual (size, proportion) requirements of the touch screen, so as to form a judgment on the effective touch point. For example, for a 20-inch touch screen, 100-200 light-sensing members can be set on one side, and the corresponding touch point judgment mode can be set.

The infrared sensing component has a certain receiving angle and orientation, so that the optical signal emitted by the infrared light source is more correctly received, and the alignment direction is suitable (that is, the infrared light emitter can be hooked at least one) The angle of all infrared sensing elements on the sensing edge. Typically, all of the infrared light sensing elements on one sensing edge are arranged in the same direction and angle, corresponding to the infrared light emitters, and are connected in parallel.

In order to enable the infrared sensing component to operate without interference, all the infrared light sensing components on each sensing edge are disposed in a fixed frame, and the current signal generated by the infrared light sensing component is externally output through the detecting circuit.

Preferably, the infrared light emitters are disposed at four corners of the touch panel, and the light emitted by each of the infrared light emitters corresponds to two sensing edges, thereby having four touch points per touch point. The root crosses the light, that is to say, only when there are four light source ray intersections, the touch point is considered to be real, otherwise it is not, so that the touch point can be accurately judged without misjudgment. The infrared light emitters respectively illuminate two sensing edges. Therefore, when four infrared light emitters are simultaneously activated, each sensing edge has two infrared light emitters for illumination, due to the angle of light irradiation. Different, it will inevitably cause the infrared light sensing elements on the infrared light sensing device to be irradiated. Therefore, the infrared light emitters need to be activated in sequence, and each infrared light emitter is activated once in each scanning cycle, so that Accurately discriminate the results of each infrared light emitter illumination and reduce power consumption.

Considering the efficiency factor, the infrared light emitter can be optimally activated, that is, the two infrared light emitters on the diagonal line can be simultaneously activated, and the sensing of the infrared light sensing elements on the four sensing sides can be performed simultaneously. Judge.

In the case of sequentially starting, or optimizing the activation of the infrared light emitter, the setting of the infrared light emitter can also be increased to better judge the simultaneous presence of multiple touch points. At this time, although the added infrared light emitter is disposed on one side of the sensing side, the position of the touch point can still be judged by the positional relationship between the light and the projection.

Each infrared light emitter is subjected to high frequency modulation of infrared light when it is activated. The induced current signal generated by the infrared light sensing device at the receiving end is sent to a high frequency resonant circuit. Only when the frequency of the induced current signal is consistent with the resonant frequency of the high frequency resonant circuit, the light induced current signal is detected and received, after the detection decision The sensing status signal is sent to the computer system, which is beneficial to avoid interference and accurately determine the touch point.

The occlusion of each infrared light source by each touch point forms a sector area with a certain angle, and the center of the intersection of these sector areas is determined as the center coordinates of the touch point.

For fuzzy touch points that appear in special cases, you can exclude or confirm by dynamic calculation. A multi-touch detecting device, the device comprising:

a touch panel;

At least three infrared light emitters disposed at at least three corners of the touch panel; and

At least three sides of the touch screen are provided with infrared light sensing devices, and sides of the touch screen having infrared light sensing devices form sensing edges, and each of the infrared light emitters can emit two opposite lights. Inductive edge sensing;

a driving circuit, the driving circuit is connected to the infrared light emitter to control the light emission of the infrared light emitter; a detecting circuit, the circuit is connected to the infrared light sensing device, and the induced current generated when the infrared light sensing device is irradiated with light is judged and output to the processor;

A processor that determines the induced current, calculates the position of the touch point, and executes a corresponding command according to the position of the touch point.

The touch panel includes at least one display screen. Furthermore, the touch panel is any one of a touch screen and a display screen covered with a transparent planar body.

The infrared light emitter may be an infrared LED, or an emitter composed of an infrared laser component; the infrared light emitter is preferably disposed at four corners, each of which is disposed at four corners of the touch panel. The light emitted by the light emitter corresponds to two sensing edges.

The infrared light sensing device is a combination of more than one infrared light sensing device, that is, the infrared light sensing device includes more than one infrared light sensing device, and the infrared light sensing device is connected in parallel to the processor; The infrared sensing component has a certain receiving angle and orientation for receiving the optical signal emitted by the infrared light source more correctly, and the alignment direction is a suitable angle.

In order to enable the above-mentioned infrared sensing component to work without interference, all the infrared light sensing components on each sensing edge are disposed in a fixed frame, and the current signal generated by the infrared light sensing component is externally output through the detecting circuit; In this case, the detection circuit can also be integrated in the fixed frame.

A multi-touch detection method includes the following steps:

1. Start the infrared light emitter to scan;

2. The infrared light sensing device receives the infrared light and generates an induced current signal;

3. Detecting the above induced current signal and determining whether it is blocked;

4. Calculating a non-inductive signal region at the infrared light sensing device generated by the non-inductive current signal and a sector region formed by the region and the corresponding infrared light emitter;

5, comprehensively calculating the non-inductive signal region of the infrared light sensing device generated by the non-inductive current signal of at least three sensing edges and the sector region formed by the region and the corresponding infrared light emitter, judging the intersection of the sector regions, and The center point of the intersection is used as a touch point.

In the detecting method, in step 1, it is necessary to sequentially activate the infrared light emitter to generate a non-inductive signal area and a sector area.

In the detecting method, in step 1, the infrared light emitter can be optimized to be activated, that is, the two infrared light emitters corresponding to the diagonal line are simultaneously activated, and the scanning ends, and the corresponding infrared light sensing device is produced. After the induced current signal is generated, the remaining infrared light emitters are activated for scanning.

In the step 2, the infrared light sensing devices of the two sensing sides irradiated by the infrared light emitters are sequentially turned on to sequentially generate the induced current signals, thereby forming a calculation and judgment on the non-sensing signal regions.

The infrared light emitting device has infrared light modulated by the high frequency and then emitted outward.

In summary, the present invention changes the original touch point judging method, and designs a basic touch point judging device by using the new touch point judging method, and applies it to the detecting device, so that the multi-touch can be accurately performed. Control judgment, simple structure, easy to implement, can be widely used in various display devices, especially LCD, rear projection and other displays.

Moreover, the structure of the present invention can make the touch device smaller, and can be applied to the touch screen of various sizes, thereby avoiding the limitation that the previous touch screen can only be set to a size of 20 inches or more. DRAWINGS

Figure 1 is a schematic diagram of a prior art implementation,

2 is a schematic structural view of a prior art implementation,

3 is a schematic structural diagram of Embodiment 1 of a multi-touch device according to the present invention;

4 is a judgment effect diagram of the touch point of the embodiment shown in FIG. 3,

FIG. 5 is a schematic structural diagram of Embodiment 2 of a multi-touch device according to the present invention; FIG.

FIG. 6 is a schematic structural view of an embodiment of a detecting device of the present invention. detailed description

The implementation of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 3 is a structural manner of a multi-touch device in which only a touch screen, an infrared light emitter, an inductive edge, an infrared receiving component are described, a processor, and a detection are required for the description. The circuit, the drive circuit and the control circuit can be realized by the existing circuit, and do not need to be specially set, so it will not be described in the figure. The touch screen 10 is used as a touch panel. When the display device has no anti-scratch measures, the upper portion of the touch screen 10 can be covered with a transparent planar body for protection. The touch screen 10 can also be mounted on any display screen.

Four infrared light emitters (referred to as infrared light sources) 11 are mounted on the four corners of the touch screen 10 The emitter 11 is disposed obliquely to enable the light 14 to illuminate the sensing edge 15 formed by the infrared receiving element 12; the infrared emitting element emits a fan beam covering the entire screen along the surface of the screen. And the light 14 is received by the infrared receiving element 12 of the two sensing sides 15 opposite the light source.

The inner region formed by the sensing edge 15 is the touch region 13. The touch point occurs in the touch area 13 to be effective.

Among them, the infrared light emitter 11 emits fan-shaped light 14 along the surface of the screen to cover the entire screen. The infrared receiving element 12 acts as a light sensing device that reacts to the illumination of the light 14, specifically, the light 14 is directed to the infrared receiving element 12 to induce an induced current, and the infrared receiving element 12 that is blocked without receiving the infrared light 14 is not The inductive current generating infrared receiving element 12 has a plurality of, arranged together to form an inductive edge 15, and the infrared receiving element 12 is connected in parallel to the processor (not shown). A plurality of straight lines of different slopes are formed by connecting lines between the infrared receiving elements 12 and the infrared light emitters 11 (light sources) which are blocked by the inductive current in each of the sides 15 to form a plurality of fan-shaped regions of different angles, and the calculation is derived from 4 The intersection of the sector areas of the infrared light emitters 11 and the geometric center of the intersection area accurately determine the position of the touch points, as shown in Figure 4, a, b, c, and d points.

The infrared receiving component 12 employs an infrared receiving diode, and the pins of the two infrared receiving diodes are connected together to form an inductive component that is coupled to the processor.

The infrared light emitters 11 are not simultaneously emitted when emitting light, but are sequentially driven, each driven emission forms a sector area covering the entire screen, and the opposite sensing edges 15 of the emission source 11 are detected. The sensing state of the infrared receiving element 12. FIG. 5 is another embodiment of the present invention. In this manner, three infrared generators 21 are respectively disposed on the two corners of the touch screen 20 and the corners of the lower left side to form a triangular illumination relationship, and the rest of the structure is The settings, such as the sensing edge 25, the touch area 23, and the touch screen 20 are the same as those shown in FIG. 3. In this manner, the light sensing device is still a combination of the infrared receiving elements 22, and the infrared receiving elements 22 are arranged together to induce infrared. In the implementation of the illumination of the light 24, it is possible to determine the multi-touch of 6 o'clock and 6 o'clock or less. FIG. 6 is a schematic structural view of the method shown in FIG. 3 applied to the detecting device. As can be seen from the figure, on the basis of the structure shown in FIG. 3, the computer 16, the fixed frame 17, and the driving circuit are added (in the figure) The detection device can be realized by a circuit (not shown) and a detection circuit (not shown). The driving circuit is usually disposed together with the infrared light emitter 11 and is not identified in the figure. Similarly, the detecting circuit is usually disposed in the fixed frame together with the infrared receiving element 12 during manufacture, and is not labeled.

In the detecting device, the I/O interface control circuit is used to control the detection circuit to receive the induced current signal of the infrared receiving element, the reading of the infrared sensing state signal, and the driving trigger of the infrared light emitting device.

The detection process is:

By detecting one or more touched fingers or objects on the surface of the touch screen, the infrared light is blocked, and the position at which the finger or object is touched is determined by calculation. The calculation is performed once every other scan cycle.

a method within one scan period - driving four infrared light emitters 11 in sequence;

Sequentially turning on two opposite side infrared receiving elements 12 that are driven by the infrared light emitter;

Detecting the induced current of the infrared receiving component 12 that is turned on, the detecting circuit amplifies the sensing circuit signal, tunes, detects, determines whether the infrared induced current signal amplification decision is blocked, and records the judgment result; calculates the infrared light generated by the non-inductive current signal a non-inductive signal region at the sensing device, and a sector region formed by the region and the corresponding infrared light emitter;

The intersection of the fan-shaped regions generated by the four infrared light emitters 11 forms an intersection, and the geometric center point of the intersection is judged as a touch point;

Touch point motion detection is used as an adjunct decision method to determine or exclude fuzzy false contacts.

The touch point coordinates are transmitted to the computer 16 (i.e., the processor) in real time to execute the instructions.

After the judgment is over, the next scan cycle is performed.

Therefore, in the case of multi-touch, the accurate judgment of the touch point can be avoided, and the misjudgment of the touch point can be avoided, which is beneficial to multi-touch of various display devices, and is particularly suitable for liquid crystal and rear projection display. Screen.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Claim

A multi-touch device, characterized in that the device comprises:

a touch panel,

2. The multi-touch device according to claim 1, wherein the touch panel is any one of a touch screen, a transparent plane body, or a display screen that can be displayed in a plane.

3. The multi-touch device according to claim 1, wherein the infrared light sensing device is a combination of one or more infrared light sensing members, and the infrared light sensing members are in a parallel configuration.

4. The multi-touch device of claim 3, wherein the infrared sensing member has a certain receiving angle and orientation, and all of the infrared light sensing members on one sensing edge are in the same direction. Arranged with angles, corresponding to infrared light emitters, and connected in parallel.

5. A multi-touch detection device, the device comprising:

a touch panel;

a driving circuit, the driving circuit is connected to the infrared light emitter to control the light emission of the infrared light emitter;

a detecting circuit, the circuit is connected to the infrared light sensing device, and the induced current generated when the infrared light sensing device is illuminated by light is judged and output to the processor;

The multi-touch detecting device according to claim 5, wherein the touch panel is any one of a touch screen and a display screen covered with a transparent planar body.

1

The multi-touch detecting device according to claim 5, wherein the infrared light sensing device is a combination of one or more infrared light sensing members, and the infrared light sensing device is connected in parallel to the processor; The infrared sensing component has a certain receiving angle and orientation, so that the light signal emitted by the infrared light source is more correctly received, and the alignment direction is a suitable angle.

8. The multi-touch detecting device according to claim 5, wherein all of the infrared light sensing members on each of the sensing sides are disposed in a fixed frame, and the current signal generated by the infrared light sensing device passes the detection. The circuit is externally outputted; the detection circuit is also integrated in the fixed frame.

9. A multi-touch detection method, characterized in that the method comprises the following steps:

1), start the infrared light emitter to scan;

2), the infrared light sensing device receives the illumination of the infrared light, and generates an induced current signal;

3) detecting the induced current signal and determining whether it is blocked;

4) calculating a non-inductive signal region at the infrared light sensing device generated by the non-inductive current signal and a sector region formed by the region and the corresponding infrared light emitter;

5) comprehensively calculating a non-inductive signal region at the infrared light sensing device generated by the non-inductive current signal of at least three sensing sides and a sector region formed by the region and the corresponding infrared light emitter, and judging the intersection of the sector regions, And use the center point of the intersection as a touch point.

The method for detecting multi-touch according to claim 9, wherein in step 1), the infrared light emitter is sequentially activated to generate an inductive signal region and a sector region; and the infrared light is The transmitting device, whose infrared light is modulated by high frequency, is then emitted outward.