KR101585008B1 - Touch panel display and method for recognizing touch of the touch panel display - Google Patents

Abstract

The present invention relates to a touch panel display device and a touch recognition method thereof that can accurately recognize two touches of a touch point, A storage unit for storing coordinates; Comparing the coordinates of a second point in contact with the second point in time later than the first point and the coordinates of the first point stored in the storage unit and comparing the coordinates of at least two ghost points generated by the ghost phenomenon with the coordinates A comparison unit for comparing the coordinates of the first point with the coordinates of the first point; And an operation unit for recognizing a coordinate of one point located farthest from the first point among the second point and at least two ghost points as a comparison result from the comparison unit as an actual second point .

Touch Panel, Ghost Error

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch panel display device,

The present invention relates to a touch panel display device, and more particularly, to a touch panel display device and a touch recognition method thereof that can accurately recognize touches at two points.

2. Description of the Related Art Generally, personal computers, portable communication devices, and other personal-purpose information processing devices constitute interfaces with users by using various input devices such as a keyboard, a mouse, and a digitizer. On the other hand, as the development of mobile communication equipments is expanded, it is difficult to improve the completeness of the product as an input device such as a keyboard and a mouse, so that it is simpler and can reduce malfunctions, . In response to such demands, a touch panel has been proposed in which a user directly touches the screen with a hand or a pen to input information.

The touch panel is simple, has few malfunctions, is easy to carry because it can input characters without any other input device, and has a merit that the user can easily detect the usage method, and is being applied to various information processing apparatuses in recent years.

However, in the conventional touch panel, when two touch points of the touch panel are simultaneously contacted, another two points which are not in contact with the touch panel due to a ghost error are recognized.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for eliminating ghost error phenomenon based on the fact that two contact points, And a touch recognition method of the touch panel display device.

According to an aspect of the present invention, there is provided a touch panel display comprising: a storage unit for storing coordinates of a first point at which a touch is made at a relatively earlier time among at least two touch points of the touch panel; Comparing the coordinates of a second point in contact with the second point in time later than the first point and the coordinates of the first point stored in the storage unit and comparing the coordinates of at least two ghost points generated by the ghost phenomenon with the coordinates A comparison unit for comparing the coordinates of the first point with the coordinates of the first point; And an operation unit for recognizing a coordinate of one point located farthest from the first point among the second point and at least two ghost points as a comparison result from the comparison unit as an actual second point .

Wherein the storage further stores coordinates of the second point and coordinates of the ghost points.

The X axis coordinate of the first point and the X axis coordinate of the second point are different from each other; The Y-axis coordinate of the first point and the Y-axis coordinate of the second point are different from each other.

The X axis coordinate of the first ghost point, which is one of the ghost points, is the same as the X axis coordinate of the first point; The Y-axis coordinate of the first ghost point is the same as the Y-axis coordinate of the second point; The X axis coordinate of the second ghost point, which is the remaining one of the ghost points, is the same as the X axis coordinate of the second point; The Y-axis coordinate of the second ghost point is the same as the Y-axis coordinate of the first point.

According to another aspect of the present invention, there is provided a method of recognizing a touch panel, comprising: storing coordinates of a first point at which a touch is made at a relatively earlier time among at least two points of a touch panel; ; Comparing the coordinates of the second point that is in contact with the second point in time later than the first point and the coordinates of the first point and comparing the coordinates of the at least two ghost points generated by the ghost phenomenon with the coordinates of the first point ; And recognizing the coordinates of one point located farthest from the first point among the second point and at least two ghost points as the second comparison point as the actual second point.

Storing the coordinates of the second point and the coordinates of the ghost points prior to the comparing step.

The X axis coordinate of the first point and the X axis coordinate of the second point are different from each other; And,

The Y axis coordinate of the first point and the Y axis coordinate of the second point are different from each other.

The X axis coordinate of the first ghost point, which is one of the ghost points, is the same as the X axis coordinate of the first point; The Y-axis coordinate of the first ghost point is the same as the Y-axis coordinate of the second point; The X axis coordinate of the second ghost point, which is the remaining one of the ghost points, is the same as the X axis coordinate of the second point; The Y-axis coordinate of the second ghost point is the same as the Y-axis coordinate of the first point.

The touch panel display device and the touch recognition method according to the present invention have the following effects.

The touch recognition unit in the present invention eliminates ghost errors based on the fact that the two points described above are not actually and exactly simultaneously touched.

That is, in the present invention, the coordinates of the second point in contact with the first point are compared with the coordinates of the first point, and also the coordinates of the at least two ghost contact points generated by the ghost phenomenon, Compare to the coordinates of the point. And, as a result of this comparison, the coordinates of one point located farthest from the first point among the second point and the two ghost points are recognized as the second point where the actual contact is generated. Therefore, in the present invention, accurate touch points can be recognized when two touch points of the touch panel are contacted at almost the same time.

1 is a view illustrating a touch panel display apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the touch panel display of the present invention includes a touch panel having a plurality of X electrodes X1 to Xn and a plurality of Y electrodes Y1 to Ym, which are perpendicular to each other. The touch panel thus configured senses the coordinates corresponding to the touched portion by utilizing the fact that the capacitive generated in the intersecting region of the X electrode and the Y electrode fluctuates by the touch. At this time, the fluctuating capacitance is detected by detecting the X electrode and the Y electrode in which the voltage level fluctuates due to the variation of the capacitance.

A touch panel display device according to an embodiment of the present invention is driven in a self-capacitive manner.

This driving method sequentially detects the voltage level of each of the plurality of X electrodes X1 to Xn to detect at least one scan X electrode whose voltage level has fluctuated among the plurality of X electrodes X1 to Xn, Detecting at least one scan Y electrode having a voltage level fluctuated among a plurality of Y electrodes Y1 to Ym by sequentially sensing a voltage level of each of the Y electrodes Y1 to Ym, And combining at least one position where each of the scan Y electrodes is disposed to derive at least one coordinate.

For example, as shown in Fig. 1, when the contact is applied to the first point A, the capacitance adjacent to the first point A varies due to the contact with the first point A, The voltage level of the X2 electrode and the voltage level of the Y2 electrode fluctuate due to one capacitance. Accordingly, when the X2 electrode is detected as the scan X electrode, the Y2 electrode is detected as the scan Y electrode, and the positions where the X2 electrode and the Y2 electrode are disposed are combined, the coordinates (2, 2) is derived.

By the way, when the first point A and the second point B are contacted almost at the same time, the first portion A and the second point B are in contact with each other, The adjacent electrostatic capacitance and the electrostatic capacitance adjacent to the second point B fluctuate. That is, the voltage level of the X2 electrode and the voltage level of the Y2 electrode fluctuate due to the fluctuation of the capacitance adjacent to the first point (A), and due to the fluctuation of the capacitance adjacent to the second point (B) The voltage level and the voltage level of the Y7 electrode fluctuate. Therefore, the X2 electrode and the X6 electrode are detected as the scan X electrode, and the Y2 electrode and the Y7 electrode are detected as the scan Y electrode. (2, 2), G1 (2, 7), G2 (6, 2), and B (6, 7) can be obtained by combining the positions where the X2 electrode, the X6 electrode, the Y2 electrode, ) Are derived. Of the four coordinates thus derived, A (2, 2) is a coordinate corresponding to the first point A, B (6, 7) is a coordinate corresponding to the second point B, 7 and G2 (6, 2) are coordinates due to a ghost error that does not correspond to the first point A or the second point B. In the following, each point defined by the G1 and G2 coordinates is defined as the first and second ghost points (G1 and G2).

Since the coordinates of the first and second ghost points are coordinates generated by an error that is not caused by actual contact, in the present invention, in order to prevent such ghost points from being recognized as actual contact points, . The touch recognition unit in the present invention eliminates ghost errors based on the fact that the two points described above are not actually and exactly simultaneously touched.

2 is a diagram illustrating a touch recognition unit according to an embodiment of the present invention.

As shown in FIG. 2, the touch recognition unit according to the embodiment of the present invention includes a storage unit MR and an actual contact determination unit (TD).

The storage unit MR stores the coordinates of the first point A that is contacted at a relatively earlier time among the at least two points of the touch panel TPN. This storage unit MR may further store the coordinates of the second point B and the coordinates of the ghost points G1 and G2. At this time, the storage unit MR receives and stores coordinate information for the first point A, the second point B, and the ghost points from the lead-out integrated circuit (ROIC). This lead-out integrated circuit (ROIC) reads the point where this contact occurred when there is contact with the touch panel TPN.

The real contact determination unit (TD) removes ghost points based on the coordinates of the first point (A) stored in the storage unit (MR). To this end, the real contact determination unit (TD) includes a comparison unit (COM) and a calculation unit (CAL).

The comparison unit COM compares the coordinates of the second point B that is in contact with the first point A later than the first point A and the coordinates of the first point A stored in the storage unit MR, Coordinates of at least two ghost points (G1, G2) generated by the development are compared with the coordinates of the first point (A) stored in the storage section (MR). On the other hand, when the coordinates of the second point B and the ghost points are not stored in the storage unit MR, the comparison unit COM determines that the second point B and the ghost points G1, G2) from the lead-out integrated circuit (ROIC).

The calculation unit CAL calculates the coordinates of one point located farthest from the first point A among the second point B and the at least two ghost points G1 and G2 as the comparison result from the comparison unit COM And recognizes it as the actual second point (B).

3 is a detailed view of the electrode unit of FIG.

3, each of the plurality of X electrodes X1 to X4 includes a pattern 111 (hereinafter, referred to as a "first pattern") in which a plurality of rhombs are arranged in a first direction, And a bridge (not shown) connecting rhombs adjacent to each other in the first direction among the plurality of rhombs. Each of the plurality of Y electrodes Y1 to Y4 is formed with a pattern 113 (hereinafter, referred to as a "second pattern") in which a plurality of rhombs are connected in a second direction perpendicular to the first direction.

When contact is made at substantially the same time by two fingers to each of the first and second points A and B of the touch panel TPN including such electrodes, as shown in Fig. 3, two ghost points G1, and G2 are generated. The X axis coordinate of the first ghost point G1 is the same as the X axis coordinate of the first point A and the Y axis coordinate of the first ghost point G1 is the Y axis coordinate of the second point B same. The X axis coordinate of the second ghost point G2 is the same as the X axis coordinate of the second point B and the Y axis coordinate of the second ghost point G2 is the Y axis of the first point A It is the same as the coordinates.

FIG. 4 is a view for explaining a touch recognition method according to an embodiment of the present invention, and FIG. 5 is a flowchart illustrating a touch recognition method according to an embodiment of the present invention.

First, when a contact is applied to the first point A of the touch panel TPN, the coordinates of the first point A are stored (S1).

Thereafter, the coordinates of the second point (B) contacted at a time later than the first point (A) are compared with the coordinates of the first point (A), and at least two ghost points G1, and G2) with the coordinates of the first point (A) (S2).

As a result of this comparison, the coordinates of one point located farthest from the first point (A) out of the second point (B) and the two ghost points (G1, G2) (S3). The shortest distance D1 between the first point A and the second point B and the shortest distance D2 between the first point A and the first ghost point G1, The shortest distance D3 between the first point A and the second ghost point G2 is shown, and D1 of these distances is the longest. This means that the second point B is farther from the first point A than the other point. Thus, the second point B is recognized as the actual point of contact, and the remaining two ghost points are not recognized. As a result, in the present invention, an accurate touch point can be recognized when two touch points of the touch panel TPN are almost simultaneously contacted.

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.

1 is a view illustrating a touch panel display device according to an embodiment of the present invention;

2 is a diagram illustrating a touch recognition unit according to an embodiment of the present invention.

FIG. 3 is a detailed view of the electrode portion of FIG. 1; FIG.

4 is a view for explaining a touch recognition method according to an embodiment of the present invention;

5 is a flowchart showing a touch recognition method according to an embodiment of the present invention

Claims (8)

A storage unit for storing coordinates of a first point at which contact is made at a relatively earlier time among at least two contact points of the touch panel; Comparing the coordinates of a second point in contact with the second point in time later than the first point and the coordinates of the first point stored in the storage unit and comparing the coordinates of at least two ghost points generated by the ghost phenomenon with the coordinates A comparison unit for comparing the coordinates of the first point with the coordinates of the first point; And And a calculation unit for recognizing a coordinate of a point located farthest from the first point among the second point and at least two ghost points as a comparison result from the comparison unit as an actual second point. Display device. The method according to claim 1, Wherein the storage unit further stores coordinates of the second point and coordinates of the ghost points. The method according to claim 1, The X axis coordinate of the first point and the X axis coordinate of the second point are different from each other; And, Wherein the Y-axis coordinate of the first point is different from the Y-axis coordinate of the second point. The method of claim 3, The X axis coordinate of the first ghost point, which is one of the ghost points, is the same as the X axis coordinate of the first point; The Y-axis coordinate of the first ghost point is the same as the Y-axis coordinate of the second point; The X axis coordinate of the second ghost point, which is the remaining one of the ghost points, is the same as the X axis coordinate of the second point; And, Wherein the Y-axis coordinate of the second ghost point is the same as the Y-axis coordinate of the first point. Storing coordinates of a first point that has been touched at a relatively earlier time among at least two points of the touch panel; Comparing the coordinates of the second point that is in contact with the second point in time later than the first point and the coordinates of the first point and comparing the coordinates of the at least two ghost points generated by the ghost phenomenon with the coordinates of the first point ; And And recognizing the coordinates of one point located farthest from the first point among the second point and at least two ghost points as an actual second point, as a result of the comparison. Recognition method. 6. The method of claim 5, Further comprising the step of storing the coordinates of the second point and the coordinates of the ghost points prior to the comparing step. 6. The method of claim 5, The X axis coordinate of the first point and the X axis coordinate of the second point are different from each other; And, Wherein the Y axis coordinate of the first point and the Y axis coordinate of the second point are different from each other. 8. The method of claim 7, The X axis coordinate of the first ghost point, which is one of the ghost points, is the same as the X axis coordinate of the first point; The Y-axis coordinate of the first ghost point is the same as the Y-axis coordinate of the second point; The X axis coordinate of the second ghost point, which is the remaining one of the ghost points, is the same as the X axis coordinate of the second point; And, Wherein the Y-axis coordinate of the second ghost point is the same as the Y-axis coordinate of the first point.

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