CN102253759A - Touch position scanning method - Google Patents

Abstract

The invention relates to a touch position scanning method, which comprises the following steps: providing a touch input device with at least one light emitting module and at least one light sensing module; performing exposure of the light sensing module by using the light emitting module; scanning a light sensing element of the light sensing module; determining a light sensing element having a maximum value of a light sensing signal; calculating the partial scanning range of the light sensing element according to the maximum value of the light sensing signal; performing exposure of the light sensing module by using the light emitting module; scanning and reading the sensing value of the optical sensing element in the scanning range of part of the optical sensing elements; determining the optical sensing element with the maximum value of the optical sensing signal in the scanning range of part of the optical sensing elements, and calculating the part scanning range of the new optical sensing element; executing light sensing signal intensity calculation; and determining whether the intensity of the light sensing signal is higher than a preset value. The method uses area scanning to replace unnecessary whole area scanning to accelerate the scanning mode, so as to effectively utilize the element to improve the efficiency and the reaction speed.

Description

Touch position scanning method

technical field

The invention relates to a touch position scanning method, in particular to a touch position fast scanning method which can effectively utilize components to improve efficiency and response speed.

Background technique

A device for inputting commands or information by means of touch, such as a display screen, must accurately locate the position of the touch point within the effective sensing area of the touch. There are many ways to test the position of the touch point on the display screen, one of which is to place the light emitting module and the light sensing module at opposite positions, and use, for example, the user's finger or pen to touch the light beam at the touch point. block to determine the position of the touch point of the test user's finger. This technique for testing the position of touch points can be used in devices with large sensing areas, but its resolution depends on the number of light-emitting modules and light-sensing modules. Higher resolution requires more light emitting modules and light sensing modules, which will increase the cost and make the signal processing more complicated.

Another method for testing the position of the touch point is to place the light emitting module and the light sensing module in the corner of the touch screen at the same time. The light emitting module emits a light beam. other objects), so that part of the light beam is reflected back to some sensing elements of the light-sensing module, and the position of the reflected light beam at the touch point of the pointing object is detected by the sensing element of the light-sensing module to determine the touch point of the pointing object point corresponding to the angle. Based on the angle between the touch point of the pointing object and the light sensing module, the coordinates of the position of the touch point can be calculated by using the principle of triangular geometry. The advantage of this method of testing the position of the touch point is that it can achieve sufficient resolution accuracy with only a small number of components. However, this method of testing the position of the touch point is to test the change of the light-sensing signal by scanning all the light-sensing elements. However, since the movement of the touch point is usually continuous rather than a jumping movement with a large distance, repeated Continuously scanning all light sensing elements is not an effective scanning method, and it will also slow down the touch response speed.

In view of the shortcomings of the traditional method for testing the position of the touch point, the present invention proposes a fast scanning method for the position of the touch point to improve scanning efficiency and quickly locate.

It can be seen that the above-mentioned existing method for testing the position of the touch point obviously still has inconveniences and defects in use, and further improvement is urgently needed. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and there is no suitable method to solve the above-mentioned problems. The problem to be solved. Therefore, how to create a new method for testing the position of the touch point is one of the current important research and development topics, and it has also become a goal that the industry needs to improve.

In view of the defects in the above-mentioned existing methods for testing the position of touch points, the inventor actively researches and innovates based on years of rich practical experience and professional knowledge engaged in the design and manufacture of such products, and cooperates with the application of academic theories, in order to create a A new touch position scanning method can improve the general existing method for testing the position of touch points and make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The main purpose of the present invention is to overcome the defects of existing methods for testing the position of touch points, and provide a new method for scanning the position of touch points. The technical problem to be solved is to make it use area scanning to replace unnecessary Area scanning is used to speed up the scanning method to effectively use components to improve efficiency and response speed, which is very suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. The touch position scanning method proposed according to the present invention includes the following steps:

(a) The step of providing a touch input device, the touch input device has at least one light emitting module and at least one light sensing module, and the light sensing module has a plurality of light sensing elements;

(b) performing the step of exposing the light sensing module with the light emitting module;

(c) the step of scanning the light sensing element of the light sensing module;

(d) the step of determining the photo-sensing element having the maximum value of the photo-sensing signal;

(e) a step of calculating a partial scanning range of the light sensing element according to the maximum value of the light sensing signal;

(f) performing the step of exposing the light sensing module with the light emitting module;

(g) scanning and reading the sensing value of the light sensing element within the scanning range of part of the light sensing element;

(h) a step of determining the photo-sensing element with the maximum value of the photo-sensing signal within the scanning range of a part of the photo-sensing element, and calculating a new part of the scanning range of the photo-sensing element;

(i) performing the step of calculating the light-sensing signal strength; and

(j) A step of determining whether the intensity of the light-sensing signal is higher than a preset value.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned touch position scanning method, wherein the touch input device includes a touch screen (touch panel).

In the aforementioned touch position scanning method, wherein the touch input device includes a touch electronic whiteboard (electronic white board).

In the aforementioned touch position scanning method, the light emitting module includes an infrared laser emitting module.

In the aforementioned touch position scanning method, the step of scanning the light sensing elements of the light sensing module is to sequentially scan and read the sensing values of all the light sensing elements.

In the aforementioned touch position scanning method, wherein the step of scanning the light sensing elements of the light sensing module is to scan and read the sensing values of the light sensing elements.

In the aforementioned touch position scanning method, the step of scanning the light sensing elements of the light sensing module is skip scanning and reading the sensing value of the light sensing elements.

In the aforementioned touch position scanning method, if the intensity of the light-sensing signal is higher than a preset value, the coordinate position of the touch point of the pointing object is calculated.

In the aforementioned touch position scanning method, if the intensity of the light-sensing signal is higher than a preset value, steps (f)-(j) are repeatedly executed.

In the aforementioned touch position scanning method, if the intensity of the light-sensing signal is lower than a preset value, scanning of all the light-sensing elements in the whole area is performed.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. The scanning method of the touch position of the present invention adopts sequential scanning of the whole area and a partial scanning method, and can be realized by writing the firmware of the microcontroller. Because the previous technology is to scan and test the points of light reflection in the light sensing module point by point, it needs to scan all the sensing points every time it is tested, and the speed of the test is limited by the number of sensing points of the sensor. In order to find the maximum sensing signal point by point in the first full area scan, the subsequent scan does not scan all the sensing points, but scans part of it. Partial scan only scans the photo-sensing elements in a certain range adjacent to the photo-sensing element with the largest sensing signal, for example, three photo-sensing elements at the front and back. When the pointing object moves, the partial scan will test the The movement of the light sensing element relative to the pointing object. Therefore, it is only necessary to update the photo-sensing elements in a certain range before and after part of the scan to increase the speed of scanning and tracking the movement of the pointing object.

To sum up, the present invention relates to a touch position scanning method, including: providing a touch input device having at least one light-emitting module and at least one light-sensing module; implementing the light-sensing module with the light-emitting module Exposure; scan the light sensing element of the light sensing module; determine the light sensing element with the maximum value of the light sensing signal; calculate the partial scanning range of the light sensing element according to the maximum value of the light sensing signal; perform light sensing with the light emitting module Module exposure; scan and read the sensing value of the light sensing element within the scanning range of part of the light sensing element; determine the light sensing element with the maximum value of the light sensing signal within the scanning range of part of the light sensing element, and calculate Part of the scanning range of the new light-sensing element; performing light-sensing signal intensity calculation; and determining whether the light-sensing signal intensity is higher than a preset value. This method replaces unnecessary full-area scanning with area scanning to speed up the scanning method, so as to effectively utilize components to improve efficiency and response speed. The present invention has significant progress in technology, and has obvious positive effects, and is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of the basic concept of a touch input device according to an embodiment of a touch position scanning method of the present invention.

FIG. 2 is a block diagram of the functional structure of the touch input device according to an embodiment of the touch position scanning method of the present invention.

FIG. 3 is a flow chart of an embodiment of the whole-area scanning method of the touch position scanning method of the present invention.

FIG. 4 is a flow chart of an embodiment of a partial scanning method of a touch position scanning method according to the present invention.

100 sensing area

102a Light emitting module and light sensing module unit

102b light emitting module and light sensing module unit

202 control module

206 scan control switch module

204 amplification and processing circuit

207 signal holding circuit

208 light sensing module

210 exposure control switch module

302 Execute the exposure of the light sensing module

304 complete exposure

306 scan the entire area of the light sensing element

308 Find out the light sensing element with the maximum light sensing signal

310 calculates the scanning range of part of the light sensing element according to the maximum value of the light sensing signal

402 Executing the exposure of the photo-sensing module according to the partial scanning range determined by the full-area photo-sensing element scanning or the new part of the photo-sensing element scanning range

404 complete exposure

406 for partial scanning of the light sensing element

408 Find out the light-sensing element with the maximum light-sensing signal, and determine a new part of the light-sensing element scanning range

410 for signal strength calculation

412 Determine whether the light sensing signal strength is higher than a preset value

414 Calculate the coordinate position of the pointing object touch point

416 Re-scanning all light sensing elements in the whole area

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. Through the description of the specific implementation mode, when the technical means and functions adopted by the present invention to achieve the predetermined purpose can be obtained a deeper and more specific understanding, but the accompanying drawings are only for reference and description, and are not used to explain the present invention be restricted.

Some embodiments of the present invention will be described in detail as follows. However, in addition to the following descriptions, the present invention can also be widely implemented in other embodiments, and the scope of the present invention is not limited by the embodiments, and the scope of the patents that follow shall prevail. Furthermore, in order to provide a clearer description and a better understanding of the present invention, various parts in the drawings have not been drawn according to their relative sizes, and some dimensions have been exaggerated compared with other relevant dimensions; irrelevant details have not been fully drawn. out, in order to simplify the schema.

FIG. 1 is a schematic diagram of the basic concept of a touch input device according to an embodiment of a touch position scanning method of the present invention. The position of an indicator such as a user's finger or pen in the sensing area 100 is emitted into the sensing area 100 by the light emitting module and the light sensing module units 102a and 102b located at the two corners of the sensing area 100. , when the light hits the pointing object such as the light beam of the user's finger or pen, it is blocked and reflected back to the light emitting module and the light sensing module unit 102a and 102b, and generates the highest intensity light sensing signal, which can be judged The angle of the position of the touch point of the pointing object relative to the light emitting module and the light sensing module units 102 a and 102 b is tested. According to the angle of the position of the touch point of the pointing object relative to the light-emitting module and the light-sensing module units 102a and 102b and the distance between the light-emitting module and the light-sensing module units 102a and 102b, the pointing direction can be calculated by using the triangular geometry principle. The coordinates of the touch point of the object. The light beams that are not blocked by the pointing object are not reflected, the light sensing elements in the light emitting module and the light sensing module units 102a and 102b will not generate light sensing signals or only weak light sensing signals, and the specific angle The light sensing element is identified by the test because the light beam has been reflected by the pointing object and produces the highest intensity light sensing. Therefore, the position of the pointing object in the sensing area 100 can be deduced according to the change of the photosensitive signal and the calculation of the triangular geometry principle. What is described here is that FIG. 1 shows a schematic diagram of the basic concept of a touch input device, so parts that are not relevant to implementing the main features of the present invention are omitted. For example, the positions of the light emitting module and the light sensing module units 102 a and 102 b are not limited to be placed at the bottom. The omitted part of the touch input device in this embodiment can be implemented using any relevant prior art, and anyone skilled in the art can implement the present invention according to the general technical level. The sensing area 100 of the touch input device of the present invention includes a surface with a touch function, such as a sensing area of a touch screen (touch panel), a sensing area of a touch electronic whiteboard (electronic white board), etc., but not Limited to touch screens and touch electronic whiteboards, all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention fall within the scope of the present invention. The touch screen includes a touch flat display screen, such as a liquid crystal display screen, a plasma display screen, an internal projection display screen, etc., and does not exclude a cathode ray tube (cathode ray tube) screen. The light emitting and receiving units 102a and 102b include necessary components such as a light emitting module and a light sensing module. The light emitting module includes an infrared laser emitting module, but is not limited to an infrared laser emitting module. The infrared laser emitting module can convert the infrared laser of the point light source into a line light source by using the focusing lens and the corrugated lens, and inject the infrared laser into the entire sensing area 100 . The photo-sensing module includes a photo-sensing device such as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS), and a lens. The elements of the above-mentioned embodiments of the present invention are only examples and not limiting, and all other equivalent changes or modifications that do not deviate from the spirit disclosed by the present invention fall within the scope of the disclosed invention.

FIG. 2 is a block diagram of the functional structure of the touch input device according to an embodiment of the touch position scanning method of the present invention. This functional architecture block diagram does not show the complete light emitting module and light sensing module unit, especially the part about the light emitting module in the light emitting module and light sensing module unit, but only shows the light sensing in the touch input device The module is about the part related to the optical signal receiving and the scanning control of the light sensing element. The light emitting module and the light sensing module of the touch input device are not the focus of the present invention, but can be implemented using any relevant prior art, and anyone skilled in the art can implement the present invention according to the general technical level. As shown in Figure 1 and the foregoing description, an embodiment of a light emitting module includes an infrared laser emitting module, and the infrared laser emitting module uses a focusing lens and a wave lens to convert the infrared laser of a point light source into a line light source, and injects into the entire Sensing control area. The photo-sensing module tests the infrared laser light reflected by the touch object through the lens to form an image on the line-shaped photo-sensing element behind it. In Fig. 2, the light sensing module 208 is a linearly arranged light sensing element, and a control module 202 controls the light received by the light sensing element of the light sensing module 208 through a switch (SW1-SWN) of an exposure control switch module 210. Whether the light sensing signal enters the corresponding signal holding circuit 207 . The control module 202 controls the switch (SSW1-SSWN) of a scan control switch module 206 to determine whether the light-sensing signal in the corresponding signal holding circuit 207 is transmitted to the amplification and processing circuit 204, and the light-sensing signal is processed by the amplification and processing circuit 204 Then send it back to the control module 202. The control module 202 includes a microcontroller (Micro-controller Unit, MCU), but is not limited to a microcontroller. Each light-sensing element of the light-sensing module 208 corresponds to each switch of the exposure control switch module 210 , and the control module 202 sends an exposure control signal to determine the exposure mode of the light-sensing element according to the firmware setting. Each light-sensing element of the light-sensing module 208 also corresponds to the signal holding circuit 207 at the same time, and each signal holding circuit 207 corresponds to each switch of the scanning control switch module 206, and is set by the control module 202 according to the firmware program The scanning control signal is sent out to determine the scanning mode of the light sensing element and the signal holding circuit 207 .

The switch of the exposure control switch module 210 receives the exposure control signal sent by the control module 202 to turn on the corresponding light sensing element to receive the light beam emitted by the light emitting module and reflected back by the pointing object such as the user's finger, and the light sensing element receives the light beam A light sensing signal is generated, and the light sensing signal is sent to the signal holding circuit 207 . The control module 202 sends a scan control signal to the scan control switch module 206 according to the scan mode to determine the scan mode of the signal holding circuit 207 , that is, the light sensing element. The signal holding circuit 207 corresponding to the open switch of the scanning control switch module 206 transmits the photosensitive signal to the amplification and processing circuit 204, and the amplification and processing circuit 204 sends it back to the control module 202 after processing to confirm that the pointing object is located in the sensing area Coordinate position calculation. The geometric calculation program of the control module 202 is not the focus of the present invention, and anyone skilled in the art can implement the present invention according to the general technical level.

In order to test whether a pointing object appears in the sensing area of the touch input device, in addition to the control module must control the light emitting module and the light emitting module of the light sensing module unit to emit light beams, the control module must also control the exposure switch module to turn on The light sensing element receives the light beam reflected by the pointing object, such as the user's finger, to calculate the position of the pointing object within the sensing area. The control module first switches the switches of the exposure control switch module in order to turn on the light sensing elements in order to perform the exposure of the full light sensing element, and the received light sensing signal enters the signal holding circuit, so that any light sensing element received All light sensing signals can be received and processed by the test. Then the control module sequentially switches the switches of the scan control switch module to scan all the light sensing elements or the signal holding circuit sequentially, so that any light sensing signal received by the light sensing element can be tested and processed. When the pointing object is within the range of the testable area in the sensing area, the light sensing element receives the light sensing signal with the maximum value corresponding to the position of the pointing object, so the position of the pointing object can be roughly determined. Then the control module controls the switch module according to the light sensing element of the light sensing signal with the maximum value, and sequentially switches the switch for the area near the position of the light sensing element of the light sensing signal of the maximum value to sense the light in the vicinity of the area. area scan of the measuring element. In the area scan, only the photo-sensing elements adjacent to the photo-sensing element where the photo-sensing signal with the maximum value appears are switched on and off correspondingly so as to receive the photo-sensing signal. If the photosensitive signal whose signal intensity reaches the maximum value is received again, the position of the pointing object is confirmed, and subsequent signal processing is performed to calculate the precise position of the pointing object.

FIG. 3 is a flow chart of an embodiment of the whole-area scanning method of the touch position scanning method of the present invention. Firstly, in step 302 , the light beam emitted by the light emitting module is reflected by the pointing object, and the light sensing module executes the exposure of the reflected light, and the exposure is completed in step 304 . Then in step 306 , scan the entire area of the light sensing element. Then in step 308 , find out the photo-sensing element with the maximum photo-sensing signal. Finally, in step 310, a partial scan range of the light sensing element is calculated according to the maximum value of the light sensing signal. The scanning of the light sensing elements in step 306 includes sequential scanning of all the light sensing elements, partition scanning of the light sensing elements and skip scanning of the light sensing elements. All light sensing elements are scanned in sequence, that is, the light sensing elements are scanned point by point to test the light sensing elements that receive reflected light, that is, all light sensing elements are scanned for each test to find the light with the maximum light sensing signal. sensing element. The photosensitive element partition scanning only scans a photosensitive element (as a representative photosensitive element) in the partition area. If the photosensitive signal intensity of the photosensitive element point exceeds a predetermined value, it means that the maximum photosensitive signal is located at in this area, so enter a partial scan. If the scanning process finds that the light-sensing signal intensity of representative light-sensing elements in two consecutive areas exceeds a predetermined value, then compare the two light-sensing signals, wherein the maximum light-sensing signal is located in the light-sensing element with a stronger light-sensing signal intensity in the area. The skip scan of the photo-sensing element, for example, performs a skip-scan once every three photo-sensing elements or every four photo-sensing elements. In three light-sensing elements or four light-sensing elements, a partial scan is then performed. If the scanning process finds that the light sensing signal intensity of the light sensing elements of the two jump scans exceeds a predetermined value, then compare the two light sensing signals, wherein the largest light sensing signal is located in the light sensing element with the stronger light sensing signal intensity middle.

FIG. 4 is a flow chart of an embodiment of a partial scanning method of a touch position scanning method according to the present invention. Firstly, in step 402 , exposure of the light sensing module is performed according to the partial scanning range determined by the full-area light sensing element scanning or the new partial scanning area of the light sensing element, and the exposure is completed in step 404 . Then in step 406, a partial scan of the light sensing element is performed. Then in step 408, find out the photo-sensing element with the maximum photo-sensing signal, and determine a new partial scanning range of the photo-sensing element. Then in step 410, signal strength calculation is performed. Then in step 412, it is determined whether the light-sensing signal strength is higher than a preset value, if the light-sensing signal strength is higher than a preset value, then in step 414, calculate the coordinate position of the pointing object touch point, and repeat Execute step 402. If the light-sensing signal intensity is lower than a preset value, then in step 416, scan all the light-sensing elements in the whole area again.

The method for scanning the position of the light-sensing element of the touch input device of the present invention adopts full-area sequential scanning and partial scanning, and can be achieved by writing microcontroller firmware. Because the prior art scans and tests the light reflection point of the light sensor point by point, it needs to scan all the sensing points every time it is tested, and the speed of the test is limited by the number of sensing points of the sensor. After the first point-by-point scan to find the maximum sensing signal, in subsequent scans, not all sensing points are scanned, but partial scans are performed. Partial scanning only scans the light sensing elements in a certain range adjacent to the light sensing element with the largest sensing signal, for example, three light sensing elements at the front and rear. When the pointing object moves, the partial scan will test the light sensing element with the largest sensing signal. The movement of the measuring element relative to the pointing object. Therefore, it is only necessary to update the photo-sensing elements in a certain range before and after part of the scan, so that the speed of scanning and tracking the movement of the pointing object can be increased.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solutions of the present invention.

Claims (10)

1. position of touch scan method, this method may further comprise the steps:

(a) provide the step of a touch-control input device, described touch-control input device has at least one light emission module and at least one optical sensing module, and described optical sensing module has a plurality of Photosensing Units;

(b) carry out described optical sensing module step of exposing with described light emission module;

(c) step of the Photosensing Units of the described optical sensing module of scanning;

(d) decision has the step of the described Photosensing Units of photoinduction signal maximum;

(e) calculate the partly step of sweep limit of described Photosensing Units according to described photoinduction signal maximum;

(f) carry out described optical sensing module step of exposing with described light emission module;

(g) scan and read the step of the sensing value of the described Photosensing Units in the described portions of light sensing element sweep limit;

(h) decision partly has the described Photosensing Units of photoinduction signal maximum in the described Photosensing Units sweep limit, and calculates the partly step of sweep limit of new Photosensing Units;

(i) carry out the step that described photoinduction signal intensity is calculated; And

(j) whether the described photoinduction signal intensity of decision is higher than the step of a preset value.

2. position of touch scan method according to claim 1 is characterized in that: wherein said touch-control input device comprises a touch control screen.

3. position of touch scan method according to claim 1 is characterized in that: wherein said touch-control input device comprises a touch-control electronic blank.

4. position of touch scan method according to claim 1 is characterized in that: wherein said light emission module comprises an infrared ray laser transmitter module.

5. position of touch scan method according to claim 1 is characterized in that: the step of the Photosensing Units of the described optical sensing module of wherein said scanning is the sensing value that scans and read whole Photosensing Units in regular turn.

6. position of touch scan method according to claim 1 is characterized in that: the step of the Photosensing Units of the described optical sensing module of wherein said scanning is subarea-scanning and the sensing value that reads Photosensing Units.

7. position of touch scan method according to claim 1 is characterized in that: the step of the Photosensing Units of the described optical sensing module of wherein said scanning is jump scanning and the sensing value that reads Photosensing Units.

8. position of touch scan method according to claim 1 is characterized in that: wherein then point to the calculating of thing touch point coordinate position if described photoinduction signal intensity is higher than a preset value.

9. position of touch scan method according to claim 1 is characterized in that: wherein if described photoinduction signal intensity is higher than a preset value and then repeats (f)-(j) step.

10. position of touch scan method according to claim 1 is characterized in that: wherein then carry out region-wide whole Photosensing Units scanning if described photoinduction signal intensity is lower than a preset value.

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