TW202013139A - Method for improving touch trajectory smoothness of touch and display driver integration system and touch display device using the same using software algorithm to effectively increase the touch reporting rate - Google Patents

Abstract

Provided is a method for improving touch trajectory smoothness of a touch and display driver integration system, which is implemented by a control circuit, and includes the following steps: detecting a touch display panel to sequentially obtain four position coordinates P0, P1, P2 and P3 of four touch points at four time points; performing an insertion point position coordinate operation according to the position coordinates of the four touch points so as to obtain an insertion point position coordinate C(t), wherein the operation includes: C(t) = 0.5 * 4-by-1 matrix with entries of 1, t, t2, t3 * 4-by-4 matrix with entries of 0, 2, 2, 2, -1, 0, 1, 0, 2, -5, 4, -1, -1, 3, -3, 1 * 1-by-4 matrix with entries of P0, P1, P2, P3, where t is a positive real number; and transmitting the position coordinate P3 and the insertion point position coordinate C(t) to a processor. In addition, the present invention also discloses a touch display device using the method.

Description

Method for improving touch track smoothness of touch and display driving integrated system and touch display device using the same

The present invention relates to a touch method of an integrated touch and display driving system, and particularly to a method of improving the smoothness of the touch trajectory of the integrated touch and display driving system by software calculation.

With the popularization and vigorous development of mobile devices in recent years, touch display devices have become one of the indispensable components and the most popular technology products.

In the traditional system architecture, the touch and display functions are independently controlled by the touch chip and the display chip, and the Touch and Display Driver Integration (TDDI) system integrates the touch chip and the display chip The single chip technology not only reduces the number of components, makes the screen thinner, but also improves the transmittance of the panel, making the battery life relatively longer.

However, relatively, some electrodes must be responsible for the dual functions of display and touch scanning. Conventional technologies generally use time-sharing multiplexing to perform display and touch scanning separately, that is, display during the display interval and touch scanning during the blanking interval.

For touch technology, the reporting rate refers to the frequency that the touch panel reports the coordinates of the touch point, which will directly affect the sensitivity of the touch. Since the picture update frequency of a commonly used driver chip is 60 Hz, the frequency of touch scanning is also 60 Hz, so the report rate of a general touch panel will be limited, thereby affecting the sensitivity of touch operation.

Please refer to FIG. 1a and FIG. 1b together, wherein FIG. 1a shows a schematic diagram of the insertion point of the conventional technology, and FIG. 1b shows a schematic diagram of the curve fitting of the conventional technology.

As shown in FIG. 1a, in order to achieve a report rate of 120 Hz, the conventional technique is to obtain a first touch point coordinate 10 at a first time point and a second time point by performing a touch scan on the touch display panel After obtaining a second touch point coordinate 20, firstly report the first touch point coordinate 10 and the second touch point coordinate 20 as the insertion point coordinate, and then report the second touch point coordinate 20 , One touch scan corresponds to two reporting point coordinates to meet the 120Hz reporting rate requirement.

However, as shown in Figure 1b, when the touch point is fast and changes direction (such as a curve or a circle), the distance between the touch points is large, and the insertion point is exactly between the two touch points. Touch track smoothness will be poor.

Therefore, there is an urgent need in the art for a novel touch track smoothness processing method.

The main purpose of the present invention is to disclose a method for improving the smoothness of the touch trajectory of the integrated touch and display drive system, which can increase the touch reporting point by software calculation method without increasing the hardware cost Rate and improve the smoothness of the touch track.

To achieve the aforementioned objective, a method for improving the smoothness of the touch track of the integrated touch and display drive system is proposed, which is implemented by a control circuit and includes the following steps:

Detecting a touch display panel to obtain the position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of the} four touch points in sequence at four time points;

Perform an insertion point position coordinate operation according to the position coordinates of the four touch points to obtain an insertion point position coordinate C(t). The insertion point position coordinate operation includes:

Where t is a positive real number; and

The position coordinate P ₃ and the insertion point position coordinate C(t) are transmitted to a processor.

In one embodiment, the four touch points are obtained during a vertical blanking period or a horizontal blanking period.

In one embodiment, the touch display panel is composed of an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, and a capacitive touch A touch display panel selected by the group formed by the display panels.

To achieve the aforementioned purpose, another method for improving the smoothness of the touch trajectory of the integrated touch and display drive system is proposed, which is implemented by a control circuit and includes the following steps:

Detecting a touch display panel to obtain the position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of the} four touch points in sequence at four time points;

Perform an insertion point position coordinate operation according to the position coordinates of the four touch points to obtain a preliminary insertion point position coordinate C _1. The insertion point position coordinate operation includes:

，其中，t為一正實數；

, Where t is a positive real number;

的方向延伸線段

的一預定比例 而得到一修正插入點的位置座標C₂ ；以及Make this preliminary insertion point along the vector

Line segment

A predetermined ratio to obtain a position coordinate C _{2 of the} corrected insertion point; and

The position coordinate P ₃ and the position coordinate C _{2 are} transmitted to a processor.

In one embodiment, the four touch points are obtained during a vertical blanking period or a horizontal blanking period.

In one embodiment, the touch display panel is composed of an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, and a capacitive touch A touch display panel selected by the group formed by the display panels.

To achieve the foregoing objective, the present invention further provides a touch display device having a touch drive circuit and a touch display panel. The touch drive circuit is used to drive the touch display panel to execute a touch display program It is characterized in that the touch display program includes the aforementioned method for improving the smoothness of the touch track.

In order for your review committee to further understand the structure, features and purpose of the present invention, the drawings and the detailed description of the preferred embodiments are attached as follows.

Please refer to FIG. 2, which is a flowchart of an embodiment of the method for improving the smoothness of the touch track of the integrated touch and display driving system of the present invention.

As shown in Figure 2, the method includes the following steps:

Step a: Detect a touch display panel to obtain the position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of the} four touch points in sequence at four time points;

Step b: Perform an insertion point position coordinate calculation according to the position coordinates of the four touch points to obtain an insertion point position coordinate C(t). The insertion point position coordinate calculation includes:

Where t is a positive real number; and

Step c: Transmit the position coordinate P3 and the insertion point position coordinate C(t) to a processor.

The processor may be a system-on-chip, which is used to execute subsequent touch application programs.

In addition, the four touch points can be obtained during a vertical blanking period or a horizontal blanking period.

In addition, the touch display panel may be an optical touch display panel, a resistive touch control display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, or a capacitive touch display panel.

The principle of the present invention will be described below:

In the field of numerical analysis, spline refers to a polynomial parameter curve defined by segments. Due to its simple structure, convenient use, and the ability to approximate complex shapes in the design with approximate curves, it is also commonly used in industrial design. Get a smooth curve.

Spline Interpolation can achieve small interpolation errors with low-order polynomial splines to avoid rune phenomenon that occurs when using higher-order polynomials, meaning that it does not occur at both ends of the insertion point The fluctuation is extremely large and there is obvious oscillation, so it is more practical than Newton interpolation or Lagrange interpolation. In spline interpolation, the Bezier curve interpolation algorithm is often used to calculate the optimal insertion point to draw the outline of the curve.

Linear (1 Order ) Bez curve interpolation algorithm:

The linear (first-order) Bézier curve interpolation algorithm is a straight line between the two control points P ₀ and P _1. The calculation formula of the coordinate C(t) of the insertion point is shown in equation (1).

(1)

(1)

Among them, t ranges from 0 to 1, and the linear (first-order) Betz curve interpolation algorithm is equivalent to linear interpolation.

Second-order Bezier curve interpolation algorithm:

The second-order Bézier curve interpolation algorithm is a curve between three control points P ₀ , P ₁ and P ₂ , and the coordinate C(t) of the insertion point is shown in equation (2).

(2)

(2)

Among them, t ranges from 0 to 1.

Please refer to FIG. 3, which illustrates a schematic diagram of a conventional third-order Betz curve interpolation algorithm.

As shown in Fig. 3, the third-order Betz curve interpolation algorithm is a curve between four control points P ₀ , P ₁ , P ₂ and P ₃ , and its insertion point is between P ₁ and P ₂ .

為控制點，則由P₀ 、P₁ 、P₂ 及P₃ 四個控制點所構成 之樣條曲線C可由方程式(3)表示。make

As control points, the spline curve C composed of four control points P ₀ , P ₁ , P ₂ and P ₃ can be expressed by equation (3).

(3)

(3)

，

，

，

，以及

，而結點序數t_i 之運算式如方程式(4)所示。among them,

,

,

,

,as well as

, And the calculation formula of the node number t _i is shown in equation (4).

(4)

(4)

Where t ₀ =0, and the value of α ranges from 0 to 1. When the value of α is closer to 0, the insertion point is closer to P ₁ ; when the value of α is closer to 1, the insertion point is closer to P ₂ ; and when α=0.5, the insertion point is exactly on the perpendicular line of the line segment of P ₁ and P ₂ .

However, since the conventional third-order Bézier curve interpolation algorithm can only generate the two middle insertion points from four control points, it must be extended when it is applied to an integrated touch and display driving system The reporting point of the insertion point coordinate of the next frame will cause the reporting point to be delayed.

Please refer to FIG. 4, which illustrates a schematic diagram of an ideal insertion point coordinate.

As shown in Figure 4, the ideal insertion point coordinate algorithm is based on some previous touch points and one touch point in the back to interpolate to make the overall touch trajectory look smoother, in which the hollow white dot touch Point, the solid black dot is the insertion point.

The method for smoothing the touch trajectory proposed by the present invention is an improved third-order Betz curve interpolation algorithm, and the spline curve equation C is shown in equation (5).

(5)

(5)

Please refer to FIG. 5a to FIG. 5e together. FIG. 5a is a schematic diagram of the fitting effect of the insertion point position with a t value of 0.5 in the improved third-order Bézier curve interpolation algorithm of the present invention. FIG. In the improved third-order Bezier curve interpolation algorithm of the invention, the fitting effect of the insertion point position with t value of 1.2 is a schematic diagram; FIG. 5c shows the improved third-order Bezier curve interpolation algorithm of the present invention, t FIG. 5d is a schematic diagram of the fitting effect of the insertion point position with a value of 1.3; FIG. 5d is a schematic diagram of the fitting effect of the insertion point position with a t value of 1.5 in the improved third-order Bezier curve interpolation algorithm of the present invention; and FIG. 5e A schematic diagram of the fitting effect of the insertion point position with a t value of 1.8 in the improved third-order Bézier curve interpolation algorithm of the present invention is shown. In FIGS. 5a to 5e, hollow white dots represent touch points, and solid black dots represent insertion points.

In Fig. 5a, t=0.5, between 0 and 1, at this time each insertion point will fall between P ₁ and P ₂ .

In FIGS. 5b to 5e, the t value is between 1 and 2, and each insertion point will fall between P ₂ and P ₃ . When the value of t is greater than 1.5, the deviation of the insertion point position may increase, which makes the fitting effect of the insertion point position worse. When t is 1.3, the insertion point will have a better fitting effect.

的方向延伸線段

的一預定比例而得到一最終的插入點C₂ 的位置座標。In addition, in another embodiment of the present invention, a preliminary insertion point C _{1 is} obtained according to formula (5), and then the preliminary insertion point C _{1 is made} along the vector

Line segment

A predetermined ratio to obtain a final position coordinate of the insertion point C ₂ .

For example, first insert equation (6) with a t value of 1.3 to obtain a preliminary insertion point C ₁ .

(6)

(6)

的方向延伸線段

的20% 而得到最終的插入點C₂ 的位置座標，其最終的公式如方程式(7)所示。Then make the preliminary insertion point C ₁ along the vector

Line segment

20% to obtain the final position coordinates of the insertion point C ₂ , the final formula is shown in equation (7).

(7)

(7)

Please refer to Fig. 6, which is a schematic diagram of the curve fitting effect of the coordinates of the insertion point position generated by equation (7).

In addition, according to the above description, the present invention further discloses a touch display device.

Please refer to FIG. 7, which illustrates a block diagram of an embodiment of the touch display device of the present invention.

As shown in FIG. 7, a touch display device 100 includes a touch display panel 110, a touch drive circuit 120 and a processor 130.

The touch driving circuit 120 is used to drive the touch display panel 110 to execute a touch display procedure, and is characterized in that the touch display procedure includes the aforementioned method for improving the smoothness of the touch track.

With the design disclosed above, the present invention can increase the touch report rate and the smoothness of the touch trajectory through software calculation methods without increasing the hardware cost.

The disclosure of the present invention is a preferred embodiment, and any part of the changes or modifications that are derived from the technical idea of the present invention and easily inferred by those skilled in the art, do not deviate from the scope of the patent right of the present invention.

In summary, regardless of the purpose, means or efficacy of the present invention, it shows that it is very different from the conventional technology, and its first invention is practical and practical, and it does meet the patent requirements of the invention. To benefit society is to pray for the most.

10: First touch point coordinate 20: Second touch point coordinate 30: Midpoint coordinate 100: Touch display device 110: Touch display panel 120: Touch drive circuit 130: Processor Step a: Detect a touch Control the display panel to obtain the position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of the} four touch points in sequence at four time points Step b: Perform an insertion point according to the position coordinates of the four touch points Position coordinate operation to obtain an insertion point position coordinate C(t), where t is a positive real number Step c: Send the position coordinate P ₃ and the insertion point position coordinate C(t) to a processor

FIG. 1a is a schematic diagram of the insertion point of the conventional technology. FIG. 1b shows a schematic diagram of curve fitting of the conventional technology. FIG. 2 is a flow chart of an embodiment of the method for improving the smoothness of the touch track of the integrated touch and display driving system of the present invention. FIG. 3 shows a schematic diagram of a conventional third-order Betz curve interpolation algorithm. FIG. 4 shows a schematic diagram of an ideal insertion point coordinate. FIG. 5a shows a schematic diagram of the fitting effect of the insertion point position with a t value of 0.8 in the improved third-order Bezier curve interpolation algorithm in this case. FIG. 5b shows a schematic diagram of the fitting effect of the insertion point position with a t value of 1.2 in the improved third-order Bezier curve interpolation algorithm in this case. FIG. 5c shows a schematic diagram of the fitting effect of the insertion point position with a t value of 1.3 in the improved third-order Bezier curve interpolation algorithm in this case. Fig. 5d shows the fitting effect of the insertion point position with the t value of 1.5 in the improved third-order Bezier curve interpolation algorithm of this case. Fig. 5e shows the improved third-order Bezier curve interpolation algorithm of this case. , T is the schematic diagram of the fitting effect of the insertion point position of 1.8. 6 is a schematic diagram of the curve fitting effect of the coordinates of the insertion point position generated by another embodiment of the method of the present invention. 7 is a block diagram of an embodiment of a touch display device using the method of the present invention.

Step a: Detect a touch display panel to obtain the position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of the} four touch points in sequence at four time points

Step b: Perform an insertion point position coordinate calculation according to the position coordinates of the four touch points to obtain an insertion point position coordinate C(t), where t is a positive real number

Step c: Transmit the position coordinate P ₃ and the insertion point position coordinate C(t) to a processor

Claims (7)

A method for improving the smoothness of the touch trajectory of the integrated touch and display drive system, which is implemented by a control circuit and includes the following steps: detecting a touch display panel to obtain four in sequence at four time points The position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of} the touch point; an insertion point position coordinate operation is performed according to the position coordinates of the four touch points to obtain an insertion point position coordinate C(t), which The coordinates of the insertion point include:

Where t is a positive real number; and the position coordinate P ₃ and the insertion point position coordinate C(t) are transmitted to a processor. The method for improving the smoothness of the touch trajectory of the integrated touch and display drive system as described in item 1 of the patent scope, wherein the four touch points are in a vertical blanking period or a horizontal blanking period obtain. The method for improving the smoothness of the touch trajectory of the integrated touch and display drive system as described in item 1 of the patent scope, wherein the touch display panel is composed of an optical touch display panel and a resistive touch A touch display panel selected from the group consisting of a display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, and a capacitive touch display panel. A method for improving the smoothness of the touch trajectory of the integrated touch and display drive system, which is implemented by a control circuit and includes the following steps: detecting a touch display panel to obtain four in sequence at four time points The position coordinates P ₀ , P ₁ , P ₂ , and P _{3 of} the touch point; an insertion point position coordinate operation is performed according to the position coordinates of the four touch points to obtain a position coordinate C ₁ of the preliminary insertion point, which The coordinates of the insertion point include:

, Where t is a positive real number; make the preliminary insertion point along the vector

Line segment

To obtain a position coordinate C _{2 of} a modified insertion point at a predetermined ratio; and transmit the position coordinate P ₃ and the position coordinate C ₂ to a processor. The method for improving the smoothness of the touch trajectory of the integrated touch and display driving system as described in item 4 of the patent application scope, wherein the four touch points are in a vertical blanking period or a horizontal blanking period obtain. The method for improving the smoothness of the touch track of the integrated touch and display drive system as described in item 4 of the patent application scope, wherein the touch display panel is composed of an optical touch display panel and a resistive touch A touch display panel selected from the group consisting of a display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, and a capacitive touch display panel. A touch display device has a touch drive circuit and a touch display panel. The touch drive circuit is used to drive the touch display panel to execute a touch display program, which is characterized by the touch display program Including the method for improving the smoothness of the touch trajectory of the integrated touch and display driving system as described in any one of the items 1 to 6 of the patent application scope.

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