KR20120072502A - Infrared light touch screen display device and method for determining touch point of the same - Google Patents

Abstract

PURPOSE: An infrared ray touch screen display device and a touch pointing determining method thereof are provided to accurately calculate a coordinate of an actual touch point by using a sensing result of first and third infrared ray camera sensor modules. CONSTITUTION: First to third infrared ray camera sensor modules(CAM1-CAM3) senses touch of a display unit. A touch data processor(TDP) generates touch data including the number of actual touch points and coordinates based on a sensing result of first to third infrared ray camera sensor modules.

Description

INFRARED LIGHT TOUCH SCREEN DISPLAY DEVICE AND METHOD FOR DETERMINING TOUCH POINT OF THE SAME}

The present invention relates to an infrared touch screen display device, and more particularly, to an infrared touch screen display device and a touch point determination method thereof capable of accurately determining actual touch points corresponding to multiple touches.

In general, a touch screen display device is one of various methods for configuring an interface between a user and an information communication device using various displays, and an input device that allows a user to interface with the device by directly touching the screen with a hand or a pen. to be.

The touch screen display device is an input device that can be easily used by both men and women by interactively and intuitively by simply touching a button displayed on the display unit with a finger. Therefore, a device for issuing banks and government offices, various medical equipment, tourism And it is applied in many fields such as guidance of major organizations, traffic guidance.

The touch screen display device may include a resistive type, a capacitive type, an ultrasonic wave type, an infrared type, or the like according to a method of recognizing.

Although the advantages of the above-described methods are different from each other, in recent years, an infrared touch screen display apparatus has been focused for minimizing pressure applied to the touch surface and for ease of arrangement.

However, the conventional infrared touch screen display device has a problem of incorrectly recognizing the coordinates of the virtual image as the actual coordinates because it cannot accurately distinguish between the real image and the virtual image when determining coordinates of a plurality of touch points. As a result, when drawing two straight lines simultaneously, a line cross phenomenon in which the two straight lines cross each other may appear.

In particular, when two touches are divided and input based on a virtual diagonal line connecting two vertices of the display part, a plurality of touch points including a virtual image and a real image are gathered so close that they cannot distinguish the distance difference. Touch points corresponding to may be determined as actual touch points. In this case, a place other than the place where the user actually touches may be incorrectly recognized as the touched portion, which may cause a problem such as a line cross.

The present invention has been made to solve the above problems, the detection result from the first and second infrared camera sensor modules, the detection result from the second and third infrared camera sensor modules, and the first and second It is an object of the present invention to provide an infrared touch screen display device and a touch point determination method thereof, which can accurately obtain coordinates of an actual touch point on a display unit based on the detection results from the infrared camera sensor modules.

Infrared touch screen display device according to the present invention for achieving the above object, the touch screen panel having a rectangular display unit; First to third infrared camera sensor modules positioned at three corners of the display unit to sense a touch applied to the display unit; A retroreflective plate formed along a periphery of the display unit to reflect infrared rays emitted from the first to third infrared camera sensor modules; And detection results from the first and second infrared camera sensor modules respectively positioned at two corners of the same line, and detection from the second and third infrared camera sensor modules respectively positioned at the two two corners of the same line, respectively. And generating touch data including the number of actual touch points applied to the display unit and the coordinates of the actual touch points based on the detection results from the first and third infrared camera sensor modules located at two corners on the diagonal line. And a touch data processor.

The touch data processor generates a plurality of first unspecified touch points based on sensing results from the first and second infrared camera sensor modules; Generate a plurality of second undetermined touch points based on sensing results from the second and third infrared camera sensor modules; Generate a plurality of third undecided touchpoints based on sensing results from the first and third infrared camera module sensors; Analyzing the coordinates of the first undetermined touch points and the coordinates of the second undetermined touch points, select any two undecided touch points located closest to each other, and select the two selected undetermined touch points, respectively; A second candidate touchpoint; Analyze the coordinates of the remaining first and second unspecified touch points except for the first and second candidate touch points to select another two undecided touch points located closest to each other, and select the selected two undecided touch points, respectively. A third candidate touch point and a fourth candidate touch point; Calculating a center coordinate between the coordinates of the first candidate touch point and the coordinates of the second candidate touch point, and defining a touch point corresponding to the center coordinate as the first expected touch point; Calculating a center coordinate between the coordinates of the third candidate touch point and the coordinates of the fourth candidate touch point, and defining a touch point corresponding to the center coordinates as a second expected touch point; Analyze the coordinates of the third unspecified touch points and the coordinates of the first expected touch point to select any third undefined touch point located closest to the first expected touch point, and the selected third undecided touch point. Determine whether a first distance between the point and the first expected touch point is within a preset first reference range; Analyze the coordinates of the third unspecified touch points and the coordinates of the second expected touch point to select any third undecided touch point located closest to the second expected touch point, and the selected third undecided touch point. Determine whether a second distance between the point and the second expected touch point is within a preset second reference range; When the first and second distances are within the first and second reference ranges, the coordinates of the selected two third undecided touch points are determined as the coordinates of the actual touch points, and any of the first and second distances is determined. The coordinates of the selected first and second expected touch points are determined as the coordinates of the actual touch points when at least one is out of the first and second reference ranges.

The touch data processor may be configured to analyze the coordinates of the first unspecified touch points and the coordinates of the second unspecified touch points, when there are at least three pairs of two unspecified touch points positioned closest to each other and maintaining the same distance. The coordinates of the third undecided touch points are determined as coordinates of the actual touch point.

The touch data processing unit defines a length of an upper side of the display unit as a bottom side to generate coordinates of each of the first unspecified touch points by triangulation; Defining a length of a lower side of the display unit as a lower side to generate coordinates of each of the second undefined touch points by triangulation; In addition, the coordinates of each of the third undecided touch points may be generated by triangulation by defining a length of an imaginary diagonal line connecting the two corners on the diagonal line and crossing the display unit as a base.

The first to third infrared camera sensor modules sequentially emit infrared light; When one infrared camera sensor module emits infrared light, the other infrared camera sensor modules do not emit infrared light.

In addition, the touch point determination method of the infrared touch screen display device according to the present invention for achieving the above object, the square-shaped display unit touch screen panel; First to third infrared camera sensor modules positioned at three corners of the display unit to sense a touch applied to the display unit; In the touch point determination method of the infrared touch screen display device including a retroreflective plate formed along the display unit to reflect the infrared rays emitted from the first to third infrared camera sensor modules, the two corners of the same line Detection results from the first and second infrared camera sensor modules respectively located at the second, third and third infrared camera sensor modules respectively located at the two collinear edges, and two corners diagonally And generating touch data including the number of actual touch points applied to the display unit and the coordinates of the actual touch points based on the detection results from the first and third infrared camera sensor modules positioned at. .

The generating of the touch data may include generating a plurality of first undetermined touch points based on detection results from the first and second infrared camera sensor modules; Generating a plurality of second undetermined touch points based on detection results from the second and third infrared camera sensor modules; Generating a plurality of third undecided touch points based on the detection results from the first and third infrared camera module sensors; Analyzing the coordinates of the first undetermined touch points and the coordinates of the second undetermined touch points, select any two undecided touch points located closest to each other, and select the two selected undetermined touch points, respectively; Defining a second candidate touchpoint; Analyze the coordinates of the remaining first and second unspecified touch points except for the first and second candidate touch points to select another two undecided touch points located closest to each other, and select the selected two undecided touch points, respectively. Defining a third candidate touch point and a fourth candidate touch point; Calculating a center coordinate between the coordinates of the first candidate touch point and the coordinates of the second candidate touch point, and defining a touch point corresponding to the center coordinate as the first expected touch point; Calculating a center coordinate between the coordinates of the third candidate touch point and the coordinates of the fourth candidate touch point, and defining a touch point corresponding to the center coordinates as a second expected touch point; Analyze the coordinates of the third unspecified touch points and the coordinates of the first expected touch point to select any third undefined touch point located closest to the first expected touch point, and the selected third undecided touch point. Determining whether a first distance between the point and the first expected touch point is within a preset first reference range; Analyze the coordinates of the third unspecified touch points and the coordinates of the second expected touch point to select any third undecided touch point located closest to the second expected touch point, and the selected third undecided touch point. Determining whether a second distance between the point and the second expected touch point is within a preset second reference range; When the first and second distances are within the first and second reference ranges, the coordinates of the selected two third undecided touch points are determined as the coordinates of the actual touch points, and any of the first and second distances is determined. And determining coordinates of the selected first and second expected touch points as coordinates of actual touch points when at least one is out of the first and second reference ranges.

When the coordinates of the first unspecified touch points and the coordinates of the second unspecified touch points are analyzed, when there are at least two pairs of two unspecified touch points that are located closest to each other and maintain the same distance, the third undecided touch point is detected. The coordinates of the points are determined as the coordinates of the actual touch point.

Coordinates of each of the first unspecified touch points are calculated by triangulation, which defines a length of an upper side of the touch screen panel as a bottom side; Coordinates of each of the second unspecified touch points are calculated by triangulation, which defines a length of a lower side of the touch screen panel as a lower side; The coordinates of each of the third undecided touch points are calculated by triangulation, which defines the length of the imaginary diagonal line between the two corners of the diagonal line and crosses the touch screen panel.

The first to third infrared camera sensor modules sequentially emit infrared light; When one infrared camera sensor module emits infrared light, the other infrared camera sensor modules do not emit infrared light.

The infrared touch screen display device and its touch point determination method according to the present invention has the following effects.

In the present invention, based on the detection results from the first and second infrared camera sensor modules, the detection results from the second and third infrared camera sensor modules, and the detection results from the first and third infrared camera sensor modules. The coordinates of the actual touch point can be accurately obtained on the display unit.

1 is a view showing an infrared touch screen display device according to an embodiment of the present invention.
2A to 2H are diagrams for describing a touch point determination method according to a first embodiment of the present invention.
3A to 3E are diagrams for describing a touch point determination method according to a second embodiment of the present invention.
4 is a diagram for describing a method of calculating coordinates of third undecided touch points.

1 is a view showing an infrared touch screen display device according to an embodiment of the present invention.

In the infrared touch screen display device according to an embodiment of the present invention, as shown in Figure 1, the touch screen panel (TSP), the first to third infrared camera sensor modules (CAM1 to CAM3), the first to the first 4 includes retroreflective plates SR1 to SR4 and a touch data processor TDP.

The touch screen panel TSP has a display unit DP for displaying an image. This display portion DP has a rectangular shape.

The first to third infrared camera sensor modules CAM1 to CAM3 are positioned at three corners of four corners of the display unit DP. That is, the first and second infrared camera sensor modules CAM1 and CAM2 are located at two corners of the same line. In detail, the first and second infrared camera sensor modules CAM1 and CAM2 are positioned at corners of the upper long side of the display unit DP. The third infrared camera sensor module CAM3 is located at another corner to face the first infrared camera sensor module CAM1 in a diagonal direction.

Each of the infrared camera sensor modules CAM1 to CAM3 includes an infrared light emitting diode (LED) for emitting infrared light, an objective lens for collecting incident light, a photo sensor for sensing light collected by the objective lens, And an optical filter located at the front or the rear of the objective lens. The incident light is incident on the photo sensor through the optical filter and the objective lens. In addition, the infrared LED plays a role of emitting light toward the retroreflective plate. The resolution of the photo sensor may have a resolution of at least 500 pixels in the horizontal direction (to detect a position on at least 500 pixels in the horizontal direction).

Each of the infrared camera sensor modules CAM1 to CAM3 is provided with light that is retroreflected from at least two surfaces, respectively, and also receives infrared light emitted from the infrared camera sensor module of the other corner facing the corner where it is located. Detect. In addition, when there is a touch on the display unit DP of the touch screen panel TSP, the reflected light reflected from the retroreflective plate or the light at the touch point of a contacted object (an input means such as a hand or a pen) is blocked. The camera sensor modules CAM1 to CAM3 detect a point at which such light is blocked.

The first to fourth retroreflective plates SR1 to SR4 are formed along the periphery of the display portion DP. These retroreflective plates serve to reflect infrared light emitted from the first to third infrared camera sensor modules CAM1 to CAM3.

Each retroreflective plate is composed of a retro-reflecting layer formed by stacking a plurality of prisms.

The touch data processing unit TDP detects results from the first and second infrared camera sensor modules CAM1 and CAM2 positioned at two corners of the same line, respectively. The display unit DP based on the detection result from the second infrared camera sensor modules CAM2 and CAM3 and the detection result from the first and second infrared camera sensor modules CAM1 and CAM3 located at two corners on the diagonal. ) Generates touch data including the number of actual touch points applied to the < RTI ID = 0.0 >) < / RTI >

In addition, the touch data processor TDP controls the operations of the first to third infrared camera sensor modules CAM1 to CAM3. That is, the touch data processor TDP may control the operation order of the first to third infrared camera sensor modules CAM1 to CAM3.

As described above, according to the present invention, the detection results from the first and second infrared camera sensor modules CAM1 and CAM2 are combined, and the detection results from the first and second infrared camera sensor modules CAM2 and CAM3 are combined. Combination, and also by combining the detection results from the first and second infrared camera sensor modules (CAM1, CAM3) it is possible to generate the coordinates of the actual touch points more accurately.

Hereinafter, a method of determining coordinates of actual touch points using the infrared touch screen display device according to the present invention will be described in detail.

2A to 2H are diagrams for describing a touch point determination method according to a first embodiment of the present invention.

As shown in FIG. 2A, when two touches are applied to the display unit DP, the first to third infrared camera sensor modules CAM1 to CAM3 sequentially emit infrared light to emit the two touches T1,. Generate a detection result for T2).

That is, as shown in FIG. 2A, the first infrared camera sensor module CAM1 emits infrared lights to generate a detection result of the two touches T1 and T2. Then, the generated sensing result is supplied to the touch data processor TDP. At this time, the remaining second and third infrared camera sensor modules CAM2 and CAM3 do not operate. That is, infrared light is not emitted from these second and third infrared camera sensor modules CAM2 and CAM3.

Thereafter, as shown in FIG. 2B, the second infrared camera sensor module CAM2 emits infrared lights to generate a sensing result of these two touches. Then, the generated sensing result is supplied to the touch data processor TDP. At this time, the remaining first and third infrared camera sensor modules CAM1 and CAM3 do not operate. That is, infrared light is not emitted from these first and third infrared camera sensor modules CAM1 and CAM3.

Subsequently, as shown in FIG. 2C, the third infrared camera sensor module CAM3 emits infrared light to generate a sensing result of these two touches. Then, the generated sensing result is supplied to the touch data processor TDP. At this time, the remaining first and second infrared camera sensor modules CAM1 and CAM2 do not operate. That is, infrared light is not emitted from these first and second infrared camera sensor modules CAM1 and CAM2.

As described above, the first to third infrared camera sensor modules CAM1 to CAM3 sequentially generate sensing results for the two touches, and supply the sensing results to the touch data processor TDP.

Then, the touch data processing unit TDP analyzes the detection results from these three infrared camera sensor modules CAM1 to CAM3 to determine two actual touch points corresponding to the two touches T1 and T2 described above. Generate coordinates for.

2D to 2H illustrate a process of analyzing a detection result of the touch data processor TDP. The process illustrated in FIGS. 2D to 2H is illustrated for convenience of description, and the process is substantially the touch data processor TDP. Is executed inside.

That is, as illustrated in FIG. 2D, the touch data processing unit TDP may include the plurality of first unspecified touch points based on the detection results from the first and second infrared camera sensor modules CAM1 and CAM2. TP1 to TP4). The first undetermined touch points TP1 to TP4 include all the touch points TP3 and TP4 for the virtual image. The touch points for these virtual images are also two, and the touch points TP3 and TP4 for these virtual images intersect the infrared light from the first infrared camera sensor module and the infrared light from the second infrared camera sensor module. Appears in the In this step, since the touch data processor TDP has not yet distinguished between the virtual image and the real image, not only the coordinates of the touch points TP1 and TP2 for the real image, but also the coordinates of the touch points TP3 and TP4 for the virtual image. Generate all. That is, the touch data processor TDP generates all coordinates of the first undetermined touch points TP1 to TP4 through triangulation. Specifically, the touch data processing unit TDP has a triangle formed of an infrared ray from the first infrared camera sensor module CAM1, an infrared ray from the second infrared camera sensor module CAM2, and an upper side of the display unit DP. The coordinates of each of the first undecided touch points TP1 to TP4 are calculated using the triangulation method. Each of these coordinates includes an x-axis value and a y-axis value. The x- and y-axis values mean the coordinates of the center point of each of the first unspecified touch points TP1 to TP4.

Thereafter, the touch data processor TDP may determine a plurality of second undecided touch points based on the detection results from the first and second infrared camera sensor modules CAM2 and CAM3, as shown in FIG. 2E. TP5 to TP8). These second undetermined touch points TP5 to TP8 include all the touch points TP7 and TP8 for the virtual image. The touch points TP7 and TP8 for these virtual images are also two, so that the touch points TP7 and TP8 for these virtual images are infrared light from the second infrared camera sensor module CAM2 and a third infrared camera. The infrared light from the sensor module CAM3 appears at the intersection. In this step, since the touch data processing unit TDP has not yet distinguished between the virtual image and the real image, not only the coordinates of the touch points TP5 and TP6 for the real image but also the coordinates of the touch points TP7 and TP8 for the virtual image. Generate all. That is, the touch data processor TDP generates all coordinates of the second undetermined touch points TP5 to TP8 through triangulation. Specifically, the touch data processing unit TDP includes a triangle formed of an infrared ray from the second infrared camera sensor module CAM2, an infrared ray from the third infrared sensor module CAM3, and a left side of the display unit DP. Triangulation is used to calculate the coordinates of each of the second undecided touch points TP5 to TP8. Each of these coordinates includes an x-axis value and a y-axis value. The x- and y-axis values mean the coordinates of the center point of each of the second unspecified touch points TP5 to TP8.

Next, as illustrated in FIG. 2F, the touch data processor TDP may include a plurality of third undecided touch points based on sensing results from the first and second infrared camera sensor modules CAM1 and CAM3. (TP9 to TP12). These third undetermined touch points TP9 to TP12 include all the touch points TP11 and TP12 for the virtual image. The touch points TP11 and TP12 for these virtual images are also two, so that the touch points TP11 and TP12 for these virtual images are infrared light from the first infrared camera sensor module CAM1 and a third infrared camera. The infrared light from the sensor module CAM3 appears at the intersection. In this step, since the touch data processor TDP has not yet distinguished between the virtual image and the real image, not only the coordinates of the touch points TP9 and TP10 for the real image but also the coordinates of the touch points TP11 and TP12 for the virtual image. Generate all. That is, the touch data processor TDP generates all coordinates of the third undetermined touch points TP9 to TP12 through triangulation. Specifically, the touch data processing unit TDP is configured for a triangle composed of an infrared ray from the first infrared camera sensor module CAM1, an infrared ray from the third infrared camera sensor module CAM3, and a virtual diagonal VDL. Triangulation is used to calculate the coordinates of each of the third undecided touch points TP9 to TP12. Each of these coordinates includes an x-axis value and a y-axis value. The x- and y-axis values mean the coordinates of the center point of each third unspecified touch point TP9 to TP12.

Subsequently, as shown in FIG. 2G, the touch data processor TDP analyzes the coordinates of the first unspecified touch points TP1 to TP4 and the coordinates of the second unspecified touch points TP5 to TP8. Selects two undecided touch points located closest to each other. That is, the coordinates of one of the unspecified touch points and the coordinates of each of the remaining unspecified touch points are compared to find and select two closest unspecified touch points. The selected two undecided touch points are defined as first candidate touch points and second candidate touch points, respectively.

For example, 8 microcrystalline touch points TP1 to TP8 are shown in FIG. 2G, and it can be seen that one microcrystalline touch point TP1 and 5 microcrystalline touch point TP5 are closest to each other. have. In this case, the touch data processor TDP selects the first unspecified touch point TP1 and the fifth unspecified touch point TP5. The first unspecified touch point TP1 is defined as the first candidate touch point, and the fifth unspecified touch point TP5 is defined as the second candidate touch point.

Subsequently, the touch data processor TDP analyzes the coordinates of the remaining first and second undetermined touch points TP2 to TP4 and TP6 to TP8 except for the above-described first and second candidate touch points. Another two undecided touch points are selected, and the selected two undecided touch points are defined as a third candidate touch point and a fourth candidate touch point, respectively.

For example, in FIG. 2G, eight unspecified touch points TP1 to TP8 are shown, and the remaining six unspecified touch points excluding the previously selected first and fifth unspecified touch points TP1 and TP5 ( Looking at TP2 to TP4, TP6 to TP8, the second undefined touch point (TP2) and the sixth undefined touch point (TP6) of the six microcrystalline touch points (TP2 to TP4, TP6 to TP8) is located closest It can be seen that. In this case, the touch data processor TDP selects the second unspecified touch point TP2 and the sixth unspecified touch point TP6. The second unspecified touch point TP2 is defined as the third candidate touch point, and the sixth unspecified touch point TP6 is defined as the fourth candidate touch point.

Here, the distance between the two selected pairs of undecided touch points may be the same. For example, the distance between the first unspecified touch point TP1 and the fifth unspecified touch point TP5 in FIG. 2G and the distance between the second unspecified touch point TP2 and the sixth unspecified touch point TP6 are the same. You may. The touch data processor TDP finds two pairs of undecided touch points (ie, four undecided touch points) having the closest distances as described above when two touches occur. The distance between the touch points may be the same. However, when two touches occur as described above, the distance between at least two pairs of touch points among the three pairs of touch points having the closest distances is the same, and the two pairs of touch points are one pair of touch points. When the distance between the points is larger than the method of selecting the candidate touch point, another method may be applied (second embodiment).

For example, in FIG. 2G, the fourth unspecified touch point and the eighth unspecified touch point TP8 are closest to each other, followed by the first unspecified touch point TP1 and the fifth unspecified touch point TP5. It is close to the ranking, and it is assumed that the distance between the second unspecified touch point TP2 and the sixth unspecified touch point TP6 is equal to the distance between the first unspecified touch point TP1 and the fifth unspecified touch point TP5. When the other way is applied. This other method will be described later (second embodiment).

Next, the touch data processor TDP calculates a center coordinate between the coordinates of the first candidate touch point and the coordinates of the second candidate touch point, and defines a touch point corresponding to the center coordinates as the first expected touch point. In addition, a center coordinate between the coordinates of the third candidate touch point and the coordinates of the fourth candidate touch point is calculated, and the touch point corresponding to the center coordinate is defined as the second expected touch point. The coordinates of these first and second expected touch points may be actual coordinates for the two touches T1 and T2 described above.

However, in order to obtain more accurate coordinates for actual touch points, the detection results from the first and third infrared camera sensor modules CAM1 and CAM3 can be used, as shown in FIG. 2H.

That is, the touch data processor TDP analyzes the coordinates of the third unspecified touch points TP9 to TP12 and the coordinates of the first expected touch point TP13, as shown in FIG. 2H. Select one third undecided touch point located closest to the touch point TP13. That is, the coordinates of the first expected touch point TP13 and the coordinates of each of the third unspecified touch points TP9 to TP12 are compared to find and select one of the closest third undecided touch points. In this case, when two or more third undetermined touch points are closest to each other at the same distance from the first expected touch point TP13, one of the two or more third undetermined touch points may be randomly selected. Then, it is determined whether the first distance between the selected third undetermined touch point and the first expected touch point TP13 is within a preset first reference range.

Subsequently, the touch data processor TDP analyzes the coordinates of the third unspecified touch points TP9 to TP12 and the coordinates of the second expected touch point TP14 to be closest to the second expected touch point TP14. Select one of the third undecided touch point located. That is, by comparing the coordinates of the second expected touch point TP14 and the coordinates of each of the third unspecified touch points TP9 to TP12, one of the closest third undecided touch points is found and selected. In this case, when two or more third undetermined touch points are closest to each other at the same distance as the second expected touch point TP14, one of the two or more third undetermined touch points may be randomly selected. Then, it is determined whether the second distance between the selected third undetermined touch point and the second expected touch point TP14 is within a preset second reference range. Here, the first reference range and the second reference range may be different or may be the same.

Next, the touch data processing unit (TDP), when the first distance is located within the first reference range and the second distance is located within the second reference range, coordinates of the selected two third undetermined touch points are actually touched. Determined by their coordinates.

For example, in FIG. 2H, there are four third unspecified touch points TP9 to TP12 and two predicted touch points TP13 and TP14, where the nineth undecided touch point TP9 is the first predicted touch. It can be seen that it is closest to the point TP13, and that the tenth undecided touch point TP10 is closest to the second expected touch point TP14. In this case, the touch data processor TDP determines whether the first distance between the 9th unspecified touch point TP9 and the first expected touch point TP13 is within the first reference range, and then the 10th undecided touch. Point TP10 determines whether the second distance between the second expected touch points TP14 is within the second reference range. As a result of this determination, if the first and second distances are located within the first and second reference ranges, the coordinates of the undetermined touch points TP9 and TP10, respectively, are determined as the coordinates of the actual touch points. . On the other hand, as a result of this determination, if any one of the first and second distances is out of the reference range, the coordinates of the first and second expected touch points TP13 and TP14 are determined as the coordinates for the actual touch points. do.

The embodiment described with reference to FIGS. 2A to 2H illustrates a method of obtaining a position of an actual touch point when two touches T1 and T2 are located on either side of a virtual diagonal VDL. . That is, when both touches T1 and T2 exist in only one of the two areas A1 and A2 of the display portion DP divided by the virtual diagonal line VDL, the touches T1 and T2. It suggests to find the actual touch points for.

Hereinafter, referring to FIGS. 3A to 3E, a method of obtaining actual touch points for these touches when two touches are divided into two regions is as follows.

3A to 3E are diagrams for describing a touch point determination method according to a second embodiment of the present invention.

As shown in FIG. 3A, two touches exist in two regions based on a virtual diagonal line VDL. In this case, similarly to the first embodiment described above, the first to third infrared camera sensor modules CAM3 sequentially emit infrared lights to generate sensing results for the two touches. The generated sensing results are supplied to the touch data processor TDP.

That is, the first to third infrared camera sensor modules CAM1 to CAM3 in the second embodiment detect the two touches T1 and T2 in the manner as shown in FIGS. 2A to 2C. Create them. Substantially the process of generating the sensing results in this second embodiment is the same as that in the first embodiment.

Then, the touch data processing unit TDP analyzes the detection results from these three infrared camera sensor modules CAM1 to CAM3 to determine two actual touch points corresponding to the two touches T1 and T2 described above. Generate coordinates for.

3B to 3E illustrate a process of analyzing a sensing result of the touch data processor TDP, and the process illustrated in FIGS. 3B to 3E is illustrated for convenience of description, and the process is substantially the touch data processor TDP. Is executed inside.

That is, as illustrated in FIG. 3B, the touch data processing unit TDP may include the plurality of first unspecified touch points based on the detection results from the first and second infrared camera sensor modules CAM1 and CAM2. TP1 to TP4).

Thereafter, as shown in FIG. 3C, a plurality of second undetermined touch points TP5 to TP8 are generated based on detection results from the first and second infrared camera sensor modules CAM2 and CAM3.

Next, as shown in FIG. 3D, a plurality of third undetermined touch points TP9 to TP12 are generated based on detection results from the first and second infrared camera sensor modules CAM1 and CAM3. .

That is, the touch data processor TDP in the second embodiment generates the first to third undetermined touch data TP1 to TP10 in the manner as shown in FIGS. 2D to 2F. Substantially, the process of generating the first to third undetermined touch data in this second embodiment is the same as that in the first embodiment. That is, in the first embodiment and the second embodiment, only the coordinates of the first to third undetermined touch data are different from each other, and the characteristics of the first to third undetermined touch data in this second embodiment are the first embodiment. Same as those in However, as shown in FIG. 3D, it can be seen that the third undecided touch points TP9 and TP10 are not four but two. This is because the two touches T1 and T2 are divided into the two regions A1 and A2 as described above.

Next, the touch data processor TDP analyzes the coordinates of the first unspecified touch points TP1 to TP4 and the coordinates of the second unspecified touch points TP5 to TP8 as shown in FIG. 3F. To select any two micro touch points that are located closest to each other. The selected two undecided touch points are defined as first candidate touch points and second candidate touch points, respectively. In addition, the touch data processor TDP analyzes the coordinates of the first and second undetermined touch points TP5 to TP8 except for the first and second candidate touch points described above. The indeterminate touch points are selected, and the selected two indeterminate touch points are defined as a third candidate touch point and a fourth candidate touch point, respectively. However, as shown in FIG. 3E, since the first and second undetermined touch points TP5 to TP8 are significantly crowded, the first and second candidate touch points and the third and fourth candidate touch points are many. Can be generated. As a result, one of the first and second undetermined touch points TP5 to TP8 may be incorrectly selected as candidate touch points corresponding to the virtual image rather than the actual image. If so, a place other than the place where the user actually touched may be misrecognized as the touched portion.

Therefore, when the two closest pairs of touch points cannot be accurately selected, two third undetermined touch points TP9 and TP10 illustrated in FIG. 3D are determined as actual touch points.

This determination method is equal to the distance between at least two pairs of touch points among the three pairs of touch points having the closest distances as described above, and the two pairs of touch points are smaller than the distance of the other pair of touch points. It can also be applied when large.

As such, the touch data processor TDP determines the actual touch point in the manner described in any one of the first and second embodiments according to the positions of the two touches T1 and T2. In this case, the touch data processor TDP may determine the actual touch point in the manner described in any one of the first and second embodiments based on the number of third undetermined touch points. That is, when the number of the third undetermined touch points TP9 to TP12 generated is four, as shown in FIG. 2F, it is determined that the two touches described above are concentrated in one region and thus, the first embodiment is performed. The coordinates for the actual touch points are determined in the manner shown in the example (FIGS. 2H and 2G). On the other hand, when the number of the third undetermined touch points TP9 and TP10 generated is two, as shown in FIG. 3D, the two touches described above are divided into two areas A1 and A2. By judging, the coordinates for the actual touch points are determined in the manner shown in the second embodiment (the coordinates for the third touch points are set as the coordinates of the actual touch points).

Meanwhile, in the first and second embodiments of the present invention, the infrared camera sensor modules CAM1 to CAM3 are configured as the first infrared camera sensor module CAM1, the first infrared camera sensor module CAM1, and the third infrared camera sensor module. Although driven in the order of CAM3, the infrared camera sensor modules may be driven in the order of the first infrared camera sensor module CAM1, the third infrared camera sensor module CAM3, and the second infrared camera sensor module CAM2. The second infrared camera sensor module CAM2, the first infrared camera sensor module CAM1, and the third infrared camera sensor module CAM3 may be driven in the order of the second infrared camera sensor module CAM2 and the second infrared camera sensor module CAM2 and the third. The infrared camera sensor module CAM3 and the first infrared camera sensor module CAM1 may be driven in order, and the first infrared camera sensor module CAM1, the third infrared camera sensor module CAM3, and the second infrared camera may also be driven. It may be driven in the order of the sensor module CAM2, or may be driven in the order of the third infrared camera sensor module CAM3, the second infrared camera sensor module CAM2, and the first infrared camera sensor module CAM1. The third infrared camera sensor module CAM3, the first infrared camera sensor module CAM1, and the second infrared camera sensor module CAM2 may be operated in the order.

On the other hand, as described above, the touch data processing unit TDP has a triangle formed of an infrared ray from the first infrared camera sensor module CAM1, an infrared ray from the third infrared sensor module CAM3, and a virtual diagonal VDL. The coordinates of each of the third undecided touch points TP9 to TP12 are calculated using the triangulation method. The method of calculating these coordinates is as follows.

4 is a diagram for describing a method of calculating coordinates of third undetermined touch points.

That is, FIG. 4 illustrates a method for obtaining coordinates of one of the third unspecified touch points TP9 through TP12, wherein c is a virtual diagonal VDL length and a is a third infrared camera sensor. The length of the infrared rays emitted from the module CAM3 to reach the undetermined touch point, b means the length of the infrared rays emitted from the first infrared camera sensor module CAM1 to reach the undecided touch point TP. Y is the length of the repair line connecting the undetermined touch point (TP) and the virtual diagonal line (VDL), and X is the length of c minus d. The horizontal means the length of the lower side of the display part DP, and the vertical means the length of the left side of the display part DP. The display part DP is a square having the same length of all sides.

At this time, the coordinate of the touch point is calculated by the following equation (1).

45 degrees in Equation 1 is a numerical value applied when the display unit is square, and this value may be changed according to the shape of the display unit.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

CAM1 to CAM3: infrared camera sensor module SR1 to SR4: retroreflective plate
TP9 to TP12: Touch point TSP: Touch screen panel
TDP: touch data processing unit DP: display unit
VDL: Virtual Diagonal A1 and A2: Region

Claims (10)

A touch screen panel having a rectangular display unit;
First to third infrared camera sensor modules positioned at three corners of the display unit to sense a touch applied to the display unit;
A retroreflective plate formed along a periphery of the display unit to reflect infrared rays emitted from the first to third infrared camera sensor modules; And,
Detection results from the first and second infrared camera sensor modules respectively located at two corners of the same line, detection results from the second and third infrared camera sensor modules respectively located at the two corners of the same line, And touch data for generating touch data including the number of actual touch points applied to the display unit and the coordinates of the actual touch points based on the detection results from the first and third infrared camera sensor modules positioned at two corners on the diagonal line. Infrared touch screen display device comprising a processing unit. The method of claim 1,
The touch data processing unit,
Generate a plurality of first undetermined touch points based on sensing results from the first and second infrared camera sensor modules;
Generate a plurality of second undetermined touch points based on sensing results from the second and third infrared camera sensor modules;
Generate a plurality of third undecided touchpoints based on sensing results from the first and third infrared camera module sensors;
Analyzing the coordinates of the first undetermined touch points and the coordinates of the second undetermined touch points, select any two undecided touch points located closest to each other, and select the two selected undetermined touch points, respectively; A second candidate touchpoint;
Analyze the coordinates of the remaining first and second unspecified touch points except for the first and second candidate touch points to select another two undecided touch points located closest to each other, and select the selected two undecided touch points, respectively. A third candidate touch point and a fourth candidate touch point;
Calculating a center coordinate between the coordinates of the first candidate touch point and the coordinates of the second candidate touch point, and defining a touch point corresponding to the center coordinate as the first expected touch point;
Calculating a center coordinate between the coordinates of the third candidate touch point and the coordinates of the fourth candidate touch point, and defining a touch point corresponding to the center coordinates as a second expected touch point;
Analyze the coordinates of the third unspecified touch points and the coordinates of the first expected touch point to select any third undefined touch point located closest to the first expected touch point, and the selected third undecided touch point. Determine whether a first distance between the point and the first expected touch point is within a preset first reference range;
Analyze the coordinates of the third unspecified touch points and the coordinates of the second expected touch point to select any third undecided touch point located closest to the second expected touch point, and the selected third undecided touch point. Determine whether a second distance between the point and the second expected touch point is within a preset second reference range;
When the first and second distances are within the first and second reference ranges, the coordinates of the selected two third undecided touch points are determined as the coordinates of the actual touch points, and any of the first and second distances is determined. And determining coordinates of the selected first and second expected touch points as coordinates of actual touch points when at least one is out of the first and second reference ranges. The method of claim 2,
The touch data processing unit,
When the coordinates of the first unspecified touch points and the coordinates of the second unspecified touch points are analyzed, when there are at least three pairs of two unspecified touch points positioned closest to each other and maintaining the same distance, the third undecided touch point is detected. Infrared touch screen display device characterized in that the coordinates of the points to determine the coordinates of the actual touch point. The method of claim 2,
The touch data processing unit,
Defining a length of an upper side of the display unit as a bottom side to generate coordinates of each of the first unspecified touch points by triangulation;
Defining a length of a lower side of the display unit as a lower side to generate coordinates of each of the second undefined touch points by triangulation; And,
Infrared touch screen display device characterized in that the coordinates of each of the third undetermined touch points by triangulation method by defining the length of the imaginary diagonal line between the two corners on the diagonal and across the display unit as the base. The method of claim 1,
The first to third infrared camera sensor modules sequentially emit infrared light;
When one infrared camera sensor module emits infrared light, the other infrared camera sensor modules do not emit infrared light. A display unit having a rectangular shape on a touch screen panel; First to third infrared camera sensor modules positioned at three corners of the display unit to sense a touch applied to the display unit; In the touch point determination method of the touch screen display device including a retro-reflective plate is formed along the circumference of the display unit to reflect the infrared rays emitted from the first to third infrared camera sensor modules,
Detection results from the first and second infrared camera sensor modules respectively located at two corners of the same line, detection results from the second and third infrared camera sensor modules respectively located at the two corners of the same line, And generating touch data including the number of actual touch points applied to the display unit and the coordinates of the actual touch points based on the detection results from the first and third infrared camera sensor modules positioned at two corners on the diagonal line. Touch point determination method of the infrared touch screen display device comprising a. The method according to claim 6,
Generating the touch data,
Generating a plurality of first undetermined touch points based on detection results from the first and second infrared camera sensor modules;
Generating a plurality of second undetermined touch points based on detection results from the second and third infrared camera sensor modules;
Generating a plurality of third undecided touch points based on the detection results from the first and third infrared camera module sensors;
Analyzing the coordinates of the first undetermined touch points and the coordinates of the second undetermined touch points, select any two undecided touch points located closest to each other, and select the two selected undetermined touch points, respectively; Defining a second candidate touchpoint;
Analyze the coordinates of the remaining first and second unspecified touch points except for the first and second candidate touch points to select another two undecided touch points located closest to each other, and select the selected two undecided touch points, respectively. Defining a third candidate touch point and a fourth candidate touch point;
Calculating a center coordinate between the coordinates of the first candidate touch point and the coordinates of the second candidate touch point, and defining a touch point corresponding to the center coordinate as the first expected touch point;
Calculating a center coordinate between the coordinates of the third candidate touch point and the coordinates of the fourth candidate touch point, and defining a touch point corresponding to the center coordinates as a second expected touch point;
Analyze the coordinates of the third unspecified touch points and the coordinates of the first expected touch point to select any third undefined touch point located closest to the first expected touch point, and the selected third undecided touch point. Determining whether a first distance between the point and the first expected touch point is within a preset first reference range;
Analyze the coordinates of the third unspecified touch points and the coordinates of the second expected touch point to select any third undecided touch point located closest to the second expected touch point, and the selected third undecided touch point. Determining whether a second distance between the point and the second expected touch point is within a preset second reference range;
When the first and second distances are within the first and second reference ranges, the coordinates of the selected two third undecided touch points are determined as the coordinates of the actual touch points, and any of the first and second distances is determined. And determining coordinates of the selected first and second expected touch points as coordinates of actual touch points when at least one of the first and second reference ranges is out of the touch range of the infrared touch screen display device. How to determine the point. The method of claim 7, wherein
When the coordinates of the first unspecified touch points and the coordinates of the second unspecified touch points are analyzed, when there are at least two pairs of two unspecified touch points that are located closest to each other and maintain the same distance, the third undecided touch point is detected. A method for determining a touch point of an infrared touch screen display device, characterized in that the coordinates of the points are determined as the coordinates of the actual touch point. The method of claim 8,
Coordinates of each of the first unspecified touch points are calculated by triangulation, which defines a length of an upper side of the touch screen panel as a bottom side;
Coordinates of each of the second unspecified touch points are calculated by triangulation, which defines a length of a lower side of the touch screen panel as a lower side;
The coordinates of each of the third undecided touch points are calculated by triangulation, which defines the length of an imaginary diagonal crossing the two corners on the diagonal and intersects the touch screen panel as the base. How to determine the touch point. The method according to claim 6,
The first to third infrared camera sensor modules sequentially emit infrared light;
When the infrared camera sensor module emits infrared light, the other infrared camera sensor module does not emit infrared light.

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