TWI410839B - Touch point coordinate detection method - Google Patents

Abstract

A touch point coordinate detection method includes sequentially scanning a plurality of touch points on each gate line; expanding and grouping the touch points along the row and column directions to generate a plurality of touch areas; storing information of the touch areas after generating the touch areas; calculating the centroid coordinate of each of the touch areas and outputting the centroid coordinate as a touch point coordinate.

Description

Touch point coordinate detection method

The invention relates to a touch detection technology, in particular to a touch point coordinate detection method.

The touch panel has been widely used as an input device for various types of consumer electronic products. The user can touch, slide, write, etc. on the display device through a device such as a finger or a stylus pen, and can be displayed on the display device. Objects or menus directly command and operate, providing a more convenient and intuitive human-machine interface.

Differently sensed by different sensing technologies, the touch panel can be classified into a capacitive type, a resistive type, an optical type, and the like. Regardless of the sensing technology used, in order to identify the position touched by the user on the touch panel, the touch device must calculate the number of touch regions and its coordinate points after sensing the touched range. In general, a capacitive and optical touch technology with multi-touch recognition capability is used as an example. After the touch panel scans all the sensing units on the panel in a frame time, the detected touch points will be detected. The data is recorded, and a plurality of touch regions are obtained through a Gradient image processing method. However, such calculations are slower and require a large amount of data to be stored, thus consuming memory space and degrading system performance.

In addition, as shown in FIG. 1A, FIG. 1B, and FIG. 1C, in the first touch panel, the touch panel 10 input by the user is sensed by the touch panel, and the first BB is obtained. In the figure, the touch areas 12, 14, 16, 18, and 20 are finally calculated to obtain the center point coordinates 22, 24, 26, 28, and 30 as shown in FIG. 1C, but the original single touch point may be The detection is a plurality of touch points, and the actual number of touch areas and the touch position are calculated incorrectly.

An embodiment of the present invention provides a touch point coordinate detection method, including providing a sensing matrix including a plurality of sensing units; scanning a column of sensing units to obtain a complex array of touch points; Expanding left and right to form a complex array of expanded touch points; if the complex array has expanded touch points with overlapping touch points, the expanded array of touch points with overlapping control points are merged It is a touch group and records the top, bottom, left and right coordinate points of the touch group.

Another embodiment of the present invention provides a touch point coordinate detecting method, including: providing a sensing matrix including a plurality of sensing units; scanning a column of sensing units to obtain a plurality of adjacent and continuous touch points; The touch points are formed into a touch group; the touch group is expanded to the left and right to form an expanded touch group; and a row of sensing units under the expanded touch group is touched The situation results in a re-expanded touch group and records the top, bottom, left and right coordinate points of the re-expanded touch group.

The embodiment of the present invention can prevent the single touch point of the prior art from being erroneously detected as multiple touch points by performing the expansion and combination of the column direction and the row direction on the complex array touch points, thereby causing the actual The number of touch areas and the touch position are incorrectly calculated.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left or right, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

2 is a schematic view of a touch panel of the present invention. As shown in FIG. 2, the touch panel includes a plurality of sensing units 101. In the preferred embodiment, the sensing unit 101 is a unit area range on the touch panel. The sensing units 101 are arranged in a matrix to form the sensing matrix 110.

FIG. 3 is a flow chart showing a method for detecting a touch point coordinate according to an embodiment of the present invention. The touch point coordinate detection method proposed in this embodiment includes steps S100 to S730. Steps S100 to S730 will be described below with reference to FIG. 3 and FIG. 4A to FIG. For the arrangement of the sensing matrix in the embodiment of the present invention, the column direction refers to the horizontal direction, and the row direction refers to the vertical direction.

Step S100 includes providing a touch panel having a sensing matrix 110, which includes a plurality of sensing units. When the sensing unit is touched, the sensing component corresponding to the sensing unit generates a signal variation, and the sensing unit is located at a different signal from the other locations. In step S200, when the panel sequentially scans each column gate line, the sensing unit on the column gate line is defined as a touch point or a non-touch point according to the signal, and adjacent and consecutive touch points are defined. For a set of touch points, record the starting point and end point coordinate values of each set of touch points. As shown in FIG. 4A, the sensing unit indicated by the shadow is the sensed touch point, and the white sensing unit is the non-touch point. When the first gate line is scanned, two sets of touch points 401 and 403 are found. The information to be stored at this time is the starting point coordinate T01 and the ending point coordinate E01 of the first group of touch points 401, and the second group touches The starting point coordinate T02 and the ending point coordinate E02 of the control point 403.

In order to avoid the result that the sensing unit may be faulty or the signal sensing is not good on the non-ideal touch panel, the single touch area is recognized as the result of the plurality of touch areas, and then an expansion step S300 is performed to perform the column direction group combination. (Step S400). The above-mentioned groups of touch points are expanded to the left and right in the column direction by a predetermined number of units; whether there is overlap between the groups of touch points after expansion, and the overlapped persons are merged into one touch group (step S400). As shown in FIG. 4B, in this embodiment, the number of expansion units is set to one, and the oblique line portion is a result of expanding the first group of touch points 401 and the second group of touch points 403 to the left and right by one unit. Since the two sets of touch points 401 and 403 overlap after being expanded, the two sets of touch points 401 and 403 are combined into one touch group 405. At this time, the stored information T01, E01, T02, and E02 are updated to the starting point coordinate T1, the ending point coordinate E2, the upper coordinate H, and the lower coordinate B of the currently existing touch group 405, and the information to be stored is T1. E2, H, B have a total of four coordinates.

In step S500, it is determined whether or not group merging in the row direction is performed. Determining whether the touch group stored in the previous gate line overlaps with the touch group on the currently scanned gate line in the column direction; if there is overlap, the touch group on the two gate lines Merging into a touch group (step S610), and updating the stored touch group information, wherein the touch group information includes a start point coordinate, an end point coordinate, an upper coordinate, and a lower coordinate of the touch group . As shown in FIG. 4C, when the second gate line is scanned, a touch group is found, and the left and right expansions are performed, and the expanded touch group 407 is obtained, and the starting point coordinates of the touch group 407 are recorded. T3, end point coordinate E3. Comparing T3 and E3 with the touch group information T1 and E2 stored when scanning the first gate line, it is determined that the touch group 405 and the touch group 407 overlap, so the two groups of touches are Groups 405 and 407 are combined into one touch group 409. At this time, the stored information T1, E2, T3, E3, H, B is updated to the starting point coordinate T1 and the ending point coordinate E3, the upper coordinate H, and the lower coordinate (B+1) of the currently existing touch group 409. .

Next scan the next gate line. As shown in FIG. 4D, when the third gate line is scanned, no touch point is found, so step S630 is performed. At this time, the number of the touch-free groups of the touch group 409 is one, and the number of the touch-free points is one, and the touch group 409 is expanded downward to obtain the touch group 411 (step S710). ). The starting point coordinate T1 and the ending point coordinate E3 and the upper coordinate H are all retained and only the lower coordinate is updated (B+2).

Next, as shown in FIG. 4E, when the fourth gate line is scanned, the touch point is found and expanded into the touch group 413, and the touch group 413 and the touch group 411 are determined to occur in the column direction. The touch group 413 and the touch group 411 are merged into the touch group 415. Similarly, the starting point coordinate T1 and the ending point coordinate E3 and the upper coordinate H are retained and only the lower coordinate is updated (B+3).

Next, as shown in FIG. 4F, when the fifth gate line is scanned, no touch point is found. At this time, the number of touchless points of the touch group 415 is one, which is not greater than the set. The number of expansion units is 1, so that the touch group 415 left when the previous one is scanned is expanded downward to obtain the touch group 417. The touch group information includes: the starting point coordinate T1 and the ending point coordinate E3, upper coordinate H and lower coordinate (B+4).

In the 4G picture, when the sixth gate line is scanned, no touch point is found. In step S630, it is determined that the number of rows of non-touch points scanned downward is two, which is greater than the number of expansion units set by one, so step S730 is performed: canceling the downward execution performed when scanning the fifth gate line Expanding, the touch group 419 is obtained and its group data is updated: the starting point coordinate T1, the ending point coordinate E3, the upper coordinate H and the lower coordinate (B+3), and the touch group 419 is calculated accordingly. The center point coordinates M, as shown in Figure 4H.

In this embodiment, when the sixth gate line is scanned, the touch center point coordinates can be calculated immediately, and it is not necessary to perform complicated and large calculations after scanning all the gate lines on the panel, thereby improving system performance. In the example of the 4A~4H diagram, the maximum amount of information to be stored in the process of scanning each gate line is 6 (as shown by T1, E2, T3, E3, H, B+1 in Figure 4C), reducing memory. The space required for the body; in addition, the number of units to be expanded left and right can be set according to the performance of the touch panel and/or other requirements. Of course, the single-touch point coordinate detection method proposed by the embodiment of the present invention can also support multi-touch detection. In addition, by appropriately expanding the touch group and then combining the plurality of touch groups that belong to the same touch group, the original single touch point can be prevented from being erroneously detected. It is a plurality of touch points, and the actual number of touch areas and the touch position are calculated incorrectly.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

10~20. . . Touch area

22~30, M. . . Center point coordinates

101. . . Sensing unit on the touch panel

110. . . Induction matrix on touch panel

S100, S200, S300, S400, S500, S610, S630, S710, S730. . . step

401, 403. . . Touch point

405, 407, 409, 411, 413, 415, 417, 419. . . Touch group

T01, T02, T1, T3. . . Starting point coordinates

E01, E02, E2, E3. . . End point coordinates

H. . . Upper coordinates

B, B+1, B+2, B+3, B+4. . . Lower coordinate

1A~1C are schematic diagrams of touch inputs detected by a conventional touch panel;

2 is a schematic view showing the structure of a touch panel of the present invention;

FIG. 3 is a flow chart of a touch point coordinate detecting method according to an embodiment of the present invention;

4A to 4H are schematic views of an embodiment of forming a touch group after being touched on the touch panel of FIG. 2 .

419. . . Touch group

T1. . . Starting point coordinates

E3. . . End point coordinates

H. . . Upper coordinates

B+3. . . Lower coordinate

Claims (16)

A touch point coordinate detecting method includes: providing a sensing matrix, comprising a plurality of sensing units; scanning a column of sensing units to obtain a complex array of touch points; and expanding the complex array touch points to the left and right to form a complex array The expanded touch point; if the complex array has expanded touch points between the touch points, the expanded touch points with overlapping touch points are merged into one touch group ; and record the top, bottom, left and right coordinate points of the touch group. The touch point coordinate detecting method of claim 1, wherein the step of expanding the complex array touch point to form a complex array of expanded touch points is performed by separately A predetermined number of cells are expanded left and right to form the expanded array of touch points. The method for detecting a touch point coordinate as described in claim 1 further includes: if the sensor unit under the touch group does not have a touch point or the touch point of the next column sensor unit is still expanded to the left and right There is no touch point that overlaps the touch group in the column direction, and the touch group is expanded downward to generate a touch group that has been expanded downward. The touch point coordinate detecting method as claimed in claim 3, further comprising: If the touch point of the sensor unit under the downwardly expanding touch group has a touch point that overlaps with the downwardly expanding touch group in the column direction after expanding to the left and right, according to the The downwardly expanding touch group and the range of touch points in the column direction overlapping the downwardly expanding touch group expand the downwardly expanding touch group and update the downwardly expanding Top, bottom, left, and right coordinate points of the touch group. The method for detecting a touch point coordinate as described in claim 3, further comprising: if the sensor unit under the downwardly expanding touch group does not have a touch point or the touch group that has been expanded downward After the touch points of the lower row of the sensing unit do not have the touch points overlapping the touch-down group in the column direction after expanding to the left and right, the range of downward expansion of the touch group is cancelled. And update the top, bottom, left and right coordinate points of the touch group. The method for detecting a touch point coordinate according to claim 1 further includes: if the touch point of the column of the sensing unit below the touch group is expanded to the left and right, the touch point overlaps the touch group in the column direction. The touch point expands the touch group according to the touch group and the range of touch points overlapping the touch group in the column direction, and updates the expanded touch group to the top, bottom, and left. Right punctuation. The touch point coordinate detection method of claim 1, further comprising: determining whether the touch group overlaps with the previous column of touch groups in the column direction. The touch point coordinate detecting method according to claim 7, wherein the touch group When the group overlaps with the previous column of touch groups in the column direction, the touch group and the previous column of the touch group are merged into one touch group, and the merged touch group is updated. , lower, left, and right coordinates. The method for detecting a touch point coordinate according to claim 1, further comprising: determining a center point coordinate of the touch group. A touch point coordinate detecting method includes: providing a sensing matrix including a plurality of sensing units; scanning a column of sensing units to obtain a plurality of adjacent and continuous touch points; forming the plurality of touch points into one Touching the group; expanding the touch group to the left and right to form an expanded touch group; determining whether the expanded touch group overlaps with the previous column of touch groups in the column direction; The touch-sensing unit of the expanded touch group generates a re-expanded touch group; and records the top, bottom, left and right coordinate points of the re-expanded touch group. The touch point coordinate detecting method of claim 10, wherein the re-expanding touch group is generated according to a touched condition of the underlying sensing unit of the expanded touch group: if the touch The sensing unit below the control group does not have the touch point or the touch point of the next column of the sensing unit does not have the column direction and the expanded after expanding to the left and right. The touch points overlapped by the touch group of the touch, and the expanded touch group is expanded downward to generate the re-expanded touch group. The touch point coordinate detecting method of claim 11, further comprising: if the touch point of the column of the sensing unit below the re-expanded touch group expands to the left and right, has a column direction and the re-expansion The touch points overlapped by the touch group, and the re-expanded touch group is expanded according to the re-expanded touch group and the range of touch points overlapping the re-expanded touch group in the column direction. And update the top, bottom, left and right coordinate points of the touch group after expansion. The method for detecting a touch point coordinate as described in claim 11, further comprising: if the sensor unit under the re-expanded touch group does not have a touch point or a column under the touch group that is re-expanded The touch point of the unit does not have a touch point that overlaps the re-expanded touch group in the column direction after expanding to the left and right, and cancels the downward expansion range of the expanded touch group, and updates the Top, bottom, left, and right coordinate points of the touch group. The method for detecting a touch point coordinate according to claim 10, wherein the re-expanding touch group is generated according to a state in which a row of sensing units under the expanded touch group is touched: The touch points of a row of sensing units under the expanded touch group have touch points that overlap with the expanded touch group in the column direction after being expanded to the left and right, according to the expanded touch group and In the column direction and the expanded touch group The range of the touch points of the stack expands the expanded touch group and updates the top, bottom, left and right coordinate points of the touch group after expansion. The touch point coordinate detecting method of claim 10, wherein the expanded touch group is overlapped when the expanded touch group overlaps with the previous one touch group in the column direction The first column of touch groups is merged into a touch group, and the top, bottom, left, and right coordinate points of the touch group are updated. The method for detecting a touch point coordinate according to claim 10, further comprising: determining a center point coordinate of the touch group that is re-expanded.