MOBILE TERMINAL AND TOUCH COORDINATE PREDICTING METHOD THEREOF

• US 20150355778A1
• Filed: 01/23/2014
• Published: 12/10/2015
• Est. Priority Date: 02/19/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Byoungeul, LIM, Yeongkyu
• Granted Patent: US 9,933,883 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers

Abstract

The present invention relates to a mobile terminal capable of predicting a future touch movement based on a previous touch movement, and applying the future touch movement onto a screen, and a touch coordinate predicting method thereof. Each touch coordinate with respect to a touch movement detected on an application screen is displayed. A change of previous touch coordinates is checked at a time point when a touch coordinate is displayed. A touch coordinate predictive value is calculated based on previous touch coordinates, and then the calculated touch coordinate predictive value is applied onto a current touch coordinate. Under such configuration, a response time, which occurs between a finger'"'"'s movement and an actual character movement (or a drawing output) due to touch input lag, can be reduced.

Claims

1. A touch coordinate predicting method of a mobile terminal, the method comprising:

detecting a consecutive touch movement on an application screen;

displaying a touch output with respect to the detected touch movement;

calculating a touch coordinate predictive value, based on a change of previous coordinates; and

displaying the calculated touch coordinate predictive value in an addition manner to a current touch coordinate.

2. The method of claim 1, wherein the touch output is displayed after a predetermined time, based on a time point when the touch movement has been ended.

3. The method of claim 1, wherein the step of calculating a touch coordinate predictive value includes:

extracting a speed component and an acceleration component of the touch movement by differentiating previous touch coordinates;

amplifying the extracted speed component and acceleration component with different ratios according to a type of an application being currently displayed; and

calculating a touch coordinate predictive value by adding the amplified speed component and acceleration component, to a current touch coordinate.

4. The method of claim 3, wherein the amplification ratios which are variable according to a type of the application are stored in a memory in the form of a table.

5. The method of claim 3, wherein in the amplification step, if the application being currently displayed is an application having a small direction change of a touch movement, the speed component is mainly amplified, and

wherein if the application being currently displayed is an application having a large direction change of a touch movement, the acceleration speed component is mainly amplified.

6. The method of claim 1, wherein the calculated touch coordinate predicted value and the current coordinate are displayed by being connected to each other in the form of a straight line or a curved line.

7. The method of claim 1, wherein the step of calculating a touch coordinate predictive value includes calculating a new touch coordinate predictive value by combining previous touch coordinates with a new touch coordinate with weighted values.

8. The method of claim 1, wherein the step of calculating a touch coordinate predictive value includes:

calculating a future touch coordinate displacement value, by performing a moving average process with respect to a previous touch coordinate displacement value; and

generating a touch coordinate predictive value by adding the calculated future touch coordinate displacement value to the current touch coordinate.

9. A mobile terminal, comprising:

a display unit configured to display a prescribed application; and

a controller configured to display a touch output with respect to a consecutive touch movement detected on an application screen,

wherein the controller calculates a touch coordinate predictive value, based on a change of previous coordinates, and displays the calculated touch coordinate predictive value in an addition manner to a current touch coordinate.

10. The mobile terminal of claim 9, wherein the touch output is displayed after a predetermined time, based on a time point when the touch movement has been ended.

11. The mobile terminal of claim 9, wherein the controller is configured to:

extract a speed component and an acceleration component of a touch movement, by differentiating previous touch coordinates using different differential filters;

amplify the speed component and acceleration component extracted by the respective differential filters, with different ratios according to a type of the application; and

calculate a touch coordinate predictive value by adding the amplified speed component and acceleration component, to a current touch coordinate.

12. The mobile terminal of claim 11, wherein the controller reads amplification ratios of the speed component and the acceleration component which are variable according to an application type, from a memory.

13. The mobile terminal of claim 11, wherein if the application being currently displayed is an application having a small direction change of a touch movement, the controller mainly amplifies the speed component, and

wherein if the application being currently displayed is an application having a large direction change of a touch movement, the controller mainly amplifies the acceleration speed component.

14. The mobile terminal of claim 9, wherein the controller is provided with a coordinate predictor for calculating a future touch coordinate predictive value based on previous touch coordinates, and

wherein the coordinate predictor includes:

a first differential filter configured to output a speed component by differentiating previous touch coordinates, and a second differential filter configured to output an acceleration component by differentiating the speed component output from the first differential filter;

a first amplifier and a second amplifier configured to amplify the speed component and the acceleration component extracted by the first and second differential filters, respectively, with different ratios according to a type of the application being currently displayed; and

an adder configured to add the speed component and the acceleration component amplified by the first and second amplifiers, to the current touch coordinate.

15. The mobile terminal of claim 9, wherein the controller forms a touch path by connecting the calculated touch coordinate predictive value to the current touch coordinate in the form of a straight line or a curved line.

16. The mobile terminal of claim 9, wherein the controller is provided with a coordinate predictor for calculating a new touch coordinate predictive value by combining previous touch coordinates with a new touch coordinate with weighted values.

17. The mobile terminal of claim 9, wherein the controller is provided with a coordinate displacement predictor for calculating a future touch coordinate displacement value by performing a moving average process with respect to a previous touch coordinate displacement value, and wherein the controller generates a touch coordinate predictive value by adding the touch coordinate displacement value calculated by the coordinate displacement predictor, to the current touch coordinate.