TWI529587B - Optical touch device and its touch method - Google Patents

Description

Optical touch device and touch method thereof

The present invention relates to a touch device and a touch method thereof, and more particularly to an optical touch device and a touch method thereof.

With the advancement of today's technology, smart products have become quite popular. Since smart products can provide convenient functions such as Internet access, entertainment, navigation, etc., various smart products have become a part of most people's lives. Smart phones, tablets, PDAs and other smart products, and most smart products use touch screen technology. Therefore, touch devices and their touch methods are indispensable technologies. There are many types of touch devices and touch methods. Among them, touch screens of common touch screens include resistive, capacitive, sonic, infrared, and optical.

The resistive touch screen uses two sets of ITO conductive layers between the gaps, and uses the pressure to make the upper and lower electrodes conduct to detect the voltage change on the screen to calculate the position of the contact point for input, wherein the resistive touch Disadvantages are (1) low optical transmittance of the panel, which makes the panel require a strong backlight, so it is easier to consume power. (2) The error caused by the user's pressure is unstable. (3) The touch panel is a soft material, which is easier to scrape. Injury, reducing its service life, etc., so resistive touch has gradually been replaced by other touch methods; capacitive touch screen is the change in capacitance caused by the electrostatic combination between the transparent electrodes arranged in the human body and the human body. Inducing current to detect its coordinates, the disadvantage is The surface electric field changes for contact detection, so if there are many electromagnetic interference problems, the precision of the detection contact will be affected. The acoustic touch screen is converted into ultrasonic waves by the transducer in advance, and directly transmitted. When the touch panel is used, when the touch panel is used, the contact indicator absorbs the ultrasonic wave to cause attenuation. The relative position is calculated and calculated to obtain the precise position. The disadvantage is that the surrounding reflector antenna is mostly customized. The yield is not high, so the cost is high; the infrared touch screen is provided with an x-ray and a y-axis infrared emitter and receiver respectively on the four sides of the screen, and the touch position is calculated by using light to block the infrared light when contacting, and the disadvantage is Limited by the size of the infrared module, high resolution cannot be achieved, and the cost of a large number of infrared modules is not low, so it is gradually replaced by optical touch; optical touch uses a similar infrared touch method to utilize light After the touch object is interrupted, the touch position is calculated, and the camera is set through the two corners to detect the shadow of the touch object, and the touch point is found through the triangle positioning, and the whole is formed. Than IR touch, acoustic touch more advantages.

The following is a further explanation for optical touch. The optical touch screen uses the light receiving and blocking principle to detect the relative position of the touch object on the touch surface. Most of the designs are two images. The receiving module, such as a complementary metal oxide semiconductor (CMOS) image receiving module, is respectively disposed on the left and right corners of the touch surface of the display panel, and the light emitting unit is disposed adjacent to the image receiving module, and Reflective edge strips are respectively arranged on the display panel frame to reduce the interference of external light and improve its accuracy. The light-emitting unit transmits the incident light to the image receiving module along the original incident angle through the reflective edge strip disposed on the frame, thereby establishing an optical sensing mechanism on the touch surface.

When the user wants to touch a certain position on the touch surface with a touch object (such as a user's finger or a stylus pen) to perform a touch operation, at this time, due to the light at the position The travel path is blocked by the touch object, and the light is blocked by the touch object to generate a shadow. Therefore, the optical signal intensity that the image receiving device can sense on the light travel path is greatly attenuated. Therefore, the image receiving module disposed on the left and right corners of the touch surface can locate the relative touch angle with the touch object, and then calculate the corresponding trigonometric function, so that the touch object is located The plane coordinates on the touch surface, thereby completing the planar positioning of the touch object.

However, in the optical touch system of Taiwan Patent Publication No. 201327322, a method for locating the two-dimensional position of the shield by means of triangulation has been disclosed, and in the optical touch module of Taiwan Patent Publication No. 201115436 Exposing the reflective unit around three sides of the display panel, and referring to the first figure, as known from the above-mentioned Taiwan patent, the existing image receiving module obtains relevant image information (the position of the image receiving module and the shadow position generated by the shielding light source and After the angle relationship between the two, the position of the touch point is calculated by the operation of the corresponding trigonometric function. The complicated and a lot of computational work will fall on the algorithm, which means that the processor needs a strong function to take the responsibility. In other words, the cost of the processor is relatively higher. Moreover, in the calibration method, the detecting device and the optical touch panel of the optical touch panel of the Taiwan Patent Publication No. 201207704, the disclosure is based on the correction. The value of the post-angle relationship is obtained by trigonometric conversion to know where the light changes significantly, that is, the right-angled coordinates (x, y) of the touch point, and it can be known that the existing The calibrated optical touch technology also uses a cumbersome trigonometric operation to perform the calibration procedure. Therefore, it is bound to increase the burden on the processing unit, and the cost of the processor is relatively increased.

Therefore, the present invention provides an optical touch device and a touch control method thereof in response to the above problems. In order to solve the problem that the processing unit calculates the touch point by using the triangular operation, the processor burden is increased, and the production cost is increased. Use a definition of light After the absolute coordinates of the grid, the intersection of the two linear equations can be used as the coordinate position of the touch point. The method for solving the two-line equation is relatively simple compared to the method of trigonometry. Therefore, simple operation can reduce the burden on the processor. Therefore, the cost of the processor can be reduced, and the process of correction can be simplified to solve the above problem.

The main purpose of the present invention is to provide an optical touch device and a touch control method thereof, which are used for providing a reflector or a light guide at a fixed interval, and increasing the intensity of the light signal through the reflector or the light guide. The difference between the bright and dark signals is generated in the space to combine the absolute coordinates of a grating.

The secondary object of the present invention is to simplify the algorithm of the touch point, reduce the load of the processor, simplify the process of correction, and reduce the cost of maintenance.

In order to achieve the above-mentioned various purposes and effects, the present invention provides an optical touch device comprising a bottom plate and a frame, the frame being disposed on the bottom plate, the frame having a first side strip and a second side And a third side strip, one end of the first side strip is interconnected with one end of the second side strip, and the other end of the second side strip is intersected with one end of the third side strip, the first side strip, the first side strip The second side strip and the third side strip form a light space with the bottom plate, and at least one light source is disposed at the other end of the first side strip. The light source emits a light input into the light space, and a plurality of reflective members are The first image receiving module is disposed on the first side of the first side strip, the second side strip and the third side strip and located in the light space; and a first image receiving module is disposed on the first side At the other end of the strip, the first image receiving module captures a plurality of images reflected by the light; and a second image capturing module is disposed at the other end of the third edge strip, the second image receiving module Capture the images reflected by the light.

Furthermore, the images include at least one bright signal and a dark signal, and the bright signal and the dark signal are combined with a grating absolute coordinate, thereby enabling the optical space to generate the absolute coordinates of the grating, thereby simplifying the operation process and reducing the The load of the processor.

10‧‧‧Frame

100‧‧‧floor

11‧‧‧Reflecting parts

12‧‧‧Light guides

20‧‧‧Light guide

30‧‧‧Light space

31‧‧‧Lighting number

32‧‧‧ Dark Signal

33‧‧‧ Highlight signal

35‧‧‧Grating absolute coordinates

40‧‧‧First image receiving module

41‧‧‧Second image receiving module

42‧‧‧Light source

43‧‧‧Light source

400‧‧‧ images

410‧‧‧ images

51‧‧‧First sidebar

52‧‧‧Second Side

53‧‧‧ Third side

61‧‧‧First light guide strip

62‧‧‧Second light guide strip

63‧‧‧3rd light guide strip

200‧‧‧floor

311‧‧‧Y-axis lighting signal

312‧‧‧X-axis lighting signal

90‧‧‧ fingers

d‧‧‧Light path width

A‧‧‧ coordinates

B‧‧‧ coordinates

C‧‧‧ coordinates

D‧‧‧ coordinates

X‧‧‧X axis

Y‧‧‧Y axis

Z‧‧‧ touch point coordinates

1 is a structural diagram of an optical touch device according to a first embodiment of the present invention; and FIG. 2A is a schematic diagram of an absolute coordinate of a grating of the optical touch device according to the first embodiment of the present invention; FIG. 2B is a flowchart of obtaining an absolute coordinate of the grating of the optical touch device according to the first embodiment of the present invention; FIG. 3A is an optical touch device according to the first embodiment of the present invention; FIG. 3 is a step view showing a touch method of the optical touch device according to the first embodiment of the present invention; and FIG. 3C is an optical type according to the first embodiment of the present invention. A flowchart of obtaining a touch position of the touch device; and a fourth figure: a structural diagram of the optical touch device according to the second embodiment of the present invention.

In order to provide a better understanding and understanding of the features and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows: the present invention is directed to a conventional optical touch device and The use of complex triangles in its touch method Calculating the problem of the coordinates of the touch point coordinates, although the conventional optical touch device can effectively reduce the cost compared with the resistive and capacitive touch, the cost of the processing unit cannot be reduced because of the touch. The calculation method is to use a trigonometric operation. Therefore, the present invention provides a fixed interval reflective reflector or light guide to establish a grating absolute coordinate system, and the grating absolute coordinate system can simplify the calculation of the touch point coordinate position, and the touch method only needs to utilize two The straight line equation intersection point represents the coordinate position of the touch point. Therefore, the method of calculating the coordinate position of the touch point by using the two-line equation operation is more simplified than the conventional technique of calculating the position of the touch point coordinate by using the trigonometric operation, so Reduce the cost of the processor of the optical pick-up device.

First, please refer to the first figure, which is a structural diagram of the optical touch device according to the first embodiment of the present invention; as shown in the figure, the present invention uses the two image receiving module as an illustration, and the present invention The optical touch device includes a bottom plate 100, a frame 10, a first side strip 51, a second side strip 52, a third side strip 53, a first image receiving module 40, and a second image receiving mold. The group 41, a reflector 11, and at least one light source 42. The image receiving module 40 of the present invention is preferably a CMOS sensor, but is not limited to a CMOS sensor.

As described above, in the embodiment, the first image receiving module 40, the second image receiving module 41, the light source 42 and the reflectors 11 are used. The frame 10 is disposed above the bottom plate 100. The frame 10 includes the first side strip 51, the second side strip 52, and the third side strip 53. One end of the first side strip 51 is intersected with one end of the second side strip 52. The second side strip is connected. The other end of the 52 is connected to one end of the third side strip 53. The first side strip 51, the second side strip 52, the third side strip 53 and the bottom plate 100 form an optical space 30. The first image mode The group 40 is disposed at the other end of the first side strip 51, and the second image receiving module 41 is disposed at the other end of the third side strip 53. The light source 42 is disposed. In the first image receiving module 40 or the second image receiving module 41, the first image receiving module 40 and the first image receiving module 41 may be provided with the light sources 42 and 43 to enhance light. The intensity of the first image receiving module 40 and the second image receiving module 41 can be used to identify the intensity and sensitivity. The light sources 42 can also be disposed around the image receiving modules 40, and are not limited to In the image receiving module 40, the reflectors 11 are disposed at a fixed distance from each other, and are disposed on one side of the first side strip 51, the second side strip 52, and the third side strip 53, and are located in the light space 30. Inside.

Please refer to FIG. 2A and FIG. 2B respectively, which are schematic diagrams of the grating absolute coordinates of the optical touch device according to the first embodiment of the present invention and a flowchart for obtaining the absolute coordinates of the grating; as shown in the figure, the present invention The light sources 42 are respectively illuminating in the light space 30. The light sources 42 are configured to generate at least one bright signal 31 and at least one dark signal 32 in the light space 30 through the light reflecting member 11 to be generated through the reflective members 11 . The light signal represents the light signal 31. On the contrary, the light signal not generated by the reflector 11 represents the dark signal 32, and the light signal 31 represents a strong optical signal (indicated by a solid line), and the dark signal number 32 That is, it represents a weaker light signal (indicated by a dotted line).

The method of obtaining the path size and position of the bright signal 31 and the dark signal 32 by using the first image receiving module 40 and the second image receiving module 41 in step S100; in step S200: the first image The relative position of the receiving module 40 and the second image receiving module 41 relative to the bright signal 31 and the dark signal 32 to obtain a grating absolute coordinate 35; and in step S300: the first image receiving module 40 and the first image receiving module 40 The second image receiving module 41 records the images 400, and the images 400 are coordinate values of the grating absolute coordinates 35 at the position of the light space 30.

As described above, the reflector 11 is provided with a plurality of reflectors 11 at a fixed distance from each other on the first side strip 51, the second side strip 52, and the third side strip 53. A plurality of bright signals 31 are generated, and the remaining portions of the reflector 11 are not provided with a dark signal 32. The light signal 31 has a light energy of a darker signal 32. Therefore, the light signal 31 represents a peak, and the dark signal 32 represents In the trough, the first side strip 51 and the third side strip 53 are referred to as a Y-axis, and the bright signal 31 generated is the Y-axis bright signal 311, and the second side strip 52 is an X-axis, which is generated. The illumination signal 31 is the X-axis illumination signal 312, and the Y-axis illumination signal 311 intersects the X-axis illumination signal 312 to form a plurality of bright-point signals 33. The light space 30 can be clearly seen through the bright-point signals 33. The coordinates of the X and Y coordinates, so that the positions of the bright spot signals 33, the positions of the reflectors 11 and the first image receiving module 40 and the second image receiving module 41 are located, and the positioning values are The X, Y coordinate values in the optical space 30.

Furthermore, since the grating absolute coordinates 35 can be obtained by positioning the bright spot signals 33, the positions of the reflectors 11 and the image receiving modules 40, and the position of the bright spot signals 33 can be located by the reflectors 11 Therefore, the grating absolute coordinates 35 can be obtained by using only the positions of the reflectors 11 and the image receiving modules 40. Therefore, the grating absolute coordinates 35 are known to the user and The fixed condition can be used as a reference value for comparison and can simplify the calculation process, and the grating absolute coordinate 35 can reposition the record when in use, so the present invention is not affected by the first image receiving module 40 and the The influence of the camera angle offset of the second image receiving module 41 or the fact that the camera lens is changed by the temperature causes the actual touch position to deviate from the touch position used.

Please refer to FIG. 3A to FIG. 3C respectively, which are schematic diagrams of the use of the optical touch device according to the first embodiment of the present invention, a flow chart of the touch method, and a flow chart for obtaining a touch position; In an embodiment of the present invention, the light space 30 is touched by a finger 90, and the finger 90 shields one of the regions of the light space 30, thereby generating a complex a plurality of images 410, and the first image receiving module 40 and the second image receiving module 41 determine the positions of the images 410, wherein the first image receiving module 40 and the second image receiving module The group 41 determines that the image 410 is a touch point in a manner that the number of pixel clusters that cover the light space 30 is greater than a predetermined number of pixel clusters. In other words, the image 410 that blocks the light space 30 in the present case needs to be larger than the image 410. The light path width d of the bright signal 31 reflected by the reflector 11 or the light path width of the dark signal 32 (this is not limited by the range width of the shadow required to generate the touch according to the setting), thereby determining the The image 410 is a touch point to avoid the result of erroneous touch caused by not being intentionally caused to be shielded into the light space 30. In addition, the present invention can increase or decrease the number of the reflectors 11 on the first side strip 51, the second side strip 52 and the third side strip 53 to increase the number of the reflectors 11 to enhance the touch. The fineness of the above, and the reduction of the number of the reflectors 11 to reduce the cost, is suitable for devices that generally do not require precision operation, and the reflectors 11 are selected according to the needs of the inventors.

Furthermore, the touch method of the optical touch device according to the first embodiment of the present invention includes the following steps: Step S1: providing a light space 30 through the light source, the light space 30 includes at least one bright signal 31 and at least one dark signal 32; Step S2: the bright signal 31 and the dark signal 32 form a grating absolute coordinate 35; Step S3: the shielding light space 30 obtains a plurality of images 410; and Step S4: using the processing unit 70 to obtain the light space 30 The image 410 obtains a touch point coordinate Z after the absolute coordinates 35 of the grating.

Further, in the process of steps S3 to S4, first, in step S401, it is determined that the images 410 have a path size greater than a bright signal or a dark signal. Obtaining whether the images are touch points; in step S402, obtaining the relative positions of the images projected on the first side strip 51, the second side strip 52 and the third side strip 53, and using the grating The absolute coordinates 35 and the interpolation method obtain the projection points of the images on the X-axis and the Y-axis, that is, the position coordinates A of the first image receiving module 40 and the light space 30 are blocked by the images 410, and Projected at the position B of the Y-axis, the position coordinate C of the second image receiving module 41 and the light space 30 are shielded by the images 410, and projected at the position coordinate D of the Y-axis; in step S403: Using the coordinate A and the coordinate B of the previous step S402 to obtain a first straight line equation, the coordinate C and the coordinate D obtain a second straight line equation, which is obtained by substituting the coordinates of the known two points into y=ax+b. a, b, and then substituted into y=ax+b, the obtained equation can be obtained; in step S404: the first straight line equation and the second straight line equation are solved in tandem to solve the intersection of the two straight line equations, and the intersection point is The touch coordinate value is the position touch point coordinate Z of the image 410, and the present invention solves two straight Equation solving method is not limited to the present embodiment even benefit of embodiments of Formula embodiment.

As described above, the present invention separates the first image receiving module 40, the second image receiving module 41, and the image 410 that blocks the light space 30 by comparing the positional relationship on the grating absolute coordinates 35. The position is coordinated, and then the two-point equation is obtained, and the two-line equation is obtained to find the intersection point. This calculation method can simplify the complexity of the trigonometric operation, and reduce the computational load of the processing unit, which means that it does not need to be complicated. The trigonometric operation can be used to know the touch points. The trigonometric operation is a conventional technique and will not be described here.

In addition, please refer to the fourth figure, which is a structural diagram of the optical touch device according to the second embodiment of the present invention; as shown in the figure, the difference between the present embodiment and the first embodiment is that the optical space 30 is formed. The structure uses a bottom plate 200, a light guide frame 20, and a first guide An edge strip 61, a second light guiding strip 62, a third light guiding strip 63, a first image receiving module 40, a second image receiving module 41, a plurality of light guiding members 12 and at least one Light source 42.

As described above, the first image receiving module 40, the second image receiving module 41, the at least one light source 42 and the plurality of light guiding members 12 are illustrated. The light guiding frame 20 is disposed on the bottom plate. Above the 200, the light guide frame 20 includes the first light guide strip 61, the second light guide strip 62, and the third light guide strip 63. One end of the first light guide strip 61 and the second One end of the light guiding strip 62 is connected, and the other end of the second light guiding strip 62 is connected to one end of the third light guiding strip 63, and forms a light space 30 with the bottom plate 200. The first image receiving module 40 is disposed at the other end of the first light guiding strip 61, and the second image receiving module 41 is disposed at the other end of the third light guiding strip 63. The light source 42 is disposed on the first light guiding strip 61. The other end, or the light source 42 is disposed at the other end of the third light guiding strip 63, the light source 42 may be disposed on the first light guiding strip 61, and another light source 43 is disposed at the same time. The other end of the light guide strip 63 is disposed around the first image receiving module 40 and the light is incident on the first light guiding strip 61. The source 43 is disposed around the second image receiving module 41 and the light is incident on the third light guiding strip 63. The light guiding members 12 are disposed at a fixed distance from each other and disposed on the first light guiding strip 61. One side of the second light guiding strip 62 and the third light guiding strip 63 is located in the light space 30. The second embodiment of the present invention is similar to the first embodiment of the present invention except that the light space 30 is formed by using the light guides 12 to guide light.

In summary, the optical touch device of the present invention and the touch control method thereof, the plurality of images 410 generated by the plurality of reflectors 11 or the plurality of light guides 12 disposed at a fixed interval include at least one bright signal. 31 and a dark signal 32, the light signal 31 and the dark message No. 32 constitutes a grating absolute coordinate 35, and the absolute coordinate 35 of the grating can be used to solve the coordinates of the touch point by solving the intersection of the two linear equations. Therefore, the method for solving the coordinate value of the touch point by using the triangular operation is relatively simple. Therefore, the load amount of the touch point coordinate value of the processing unit can be reduced, and since the grating absolute coordinate 35 can be known by using known conditions, the calibration process can be simplified during the correction, and the production can be reduced by the setting of the present invention. The cost of repairs.

Therefore, the present invention is a novelty, progressive and available for industrial use. It should be in accordance with the patent application requirements of the Chinese Patent Law. It is undoubtedly the invention patent application, and the Prayer Council will grant the patent as soon as possible. .

However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that the shapes, structures, features, and spirits described in the claims of the present invention are equally changed. Modifications are intended to be included in the scope of the patent application of the present invention.

11‧‧‧Reflecting parts

40‧‧‧First image receiving module

41‧‧‧Second image receiving module

42‧‧‧Light source

43‧‧‧Light source

410‧‧‧ images

90‧‧‧ fingers

d‧‧‧Light path width

A‧‧‧ coordinates

B‧‧‧ coordinates

C‧‧‧ coordinates

D‧‧‧ coordinates

X‧‧‧X axis

Y‧‧‧Y axis

Z‧‧‧ touch point coordinates

Claims (10)

An optical touch device comprising: a bottom plate; a frame, the frame is disposed on the bottom plate, the frame has a first side strip, a second side strip and a third side strip, the first side strip One end is interconnected with one end of the second side strip, and the other end of the second side strip is interconnected with one end of the third side strip, the first side strip, the second side strip and the third side strip and the bottom board Forming a light space; at least one light source disposed at the other end of the first side strip, the light source emitting a light input into the light space; and a plurality of light reflecting members disposed at a fixed interval from each other at the first side strip One side of the second side strip and the third side strip are located in the light space; a first image receiving module is disposed at the other end of the first side strip, and the first image receiving module captures The plurality of images reflected by the light; and a second image receiving module disposed at the other end of the third edge strip, the second image receiving module capturing the images reflected by the light. The optical touch device of claim 1, wherein the images comprise at least one bright signal and a dark signal, the bright signal and the dark signal combined with a grating absolute coordinate. The optical touch device of claim 2, wherein the image receiving module corrects the image positions by using the grating absolute coordinates. An optical touch device comprising: a bottom plate; a light guiding frame having a first light guiding strip, a second light guiding strip and a third light guiding strip, one end of the first light guiding strip and the second light guiding edge One end of the strip is interconnected, and the other end of the second light guiding strip is connected to one end of the third light guiding strip, the first light guiding strip, the second light guiding strip and the third light guiding strip Forming a light space with the bottom plate; at least one light source disposed at the other end of the first light guiding strip, the light source emitting a light input to the light guiding strip; at least one light guiding member is disposed at a fixed interval One side of the first light guiding strip, the second light guiding strip and the third light guiding strip are located in the light space; a first image receiving module is disposed on the first light guiding edge At the other end of the strip, the first image receiving module captures a plurality of images generated by the light guided by the light guide; and a second image receiving module is disposed at the other end of the third light guide strip, the second The image receiving module captures the images generated by the light guided by the light. The optical touch device of claim 4, wherein the images comprise at least one bright signal and a dark signal, and the bright signal and the dark signal form a grating absolute coordinate. The optical touch device of claim 5, wherein the image receiving module corrects the image positions by using the grating absolute coordinates. An optical touch method, the method comprising: providing a light space, the light space comprising at least one bright signal and at least one dark signal, the bright signal and the dark signal form a grating absolute coordinate; shielding the light space to obtain a plurality of And using a processing unit to compare the images to absolute coordinates of the grating to obtain a touch coordinate value. The method of optical touch according to claim 7 of the patent application, wherein The processing unit compares the images with respect to the absolute coordinates of the grating to obtain a touch coordinate value, and the processing unit uses the solution according to an image receiving module coordinate position and the optical space coordinate position ratio to the absolute coordinate of the grating. The intersection of the two linear equations is the touch coordinate value. The optical touch method of claim 7, wherein in the step of masking the optical space to obtain a plurality of images, the number of pixel clusters shielding the optical space is greater than a predetermined number of pixel clusters, and the generated image. The optical touch method of claim 7, wherein the optical space comprises at least one bright signal and at least one dark signal, the bright signal and the dark signal form a grating absolute coordinate In the step, the image receiving module coordinates the position and the absolute coordinates of the grating, and the processing unit is corrected.