OPTICAL TOUCH-CONTROL SYSTEM WITH TRACK DETECTING FUNCTION AND METHOD THEREOF

• US 20130057516A1
• Filed: 01/17/2012
• Published: 03/07/2013
• Est. Priority Date: 09/07/2011
• Status: Abandoned Application

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Lu, Chih-Hung, Wu, Chih-Yen, Chen, Hsin-Chia
• Application Number:
  US13/351,236
• Publication Number:
  US 20130057516A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

The optical touch-control system processing track detection includes a light source for emitting a specific light; a sensing array for sampling the specific light reflected by an instruction object in a predetermined period of time for accordingly generating a first and a second sensing image signals; a motion detector for determining the track of the instruction object for outputting a motion vector signal according to the first and the second sensing image signals; and a processor for controlling movement of a target object according to the motion vector signal and the predetermined period of time; wherein the instruction object moves within a first zone of the sensing array.

Claims

1. An optical touch-control system processing track detection for moving an objective within a display panel according to a detected track, the optical touch-control system comprising:

a light source for emitting a specific light;

a sensing array for continuously sampling the specific light reflected by an instruction object in a predetermined period, to accordingly generate a first image signal related to a first sensing image signal and a second image signal related to a second sensing image signal; and

a motion detector for outputting a motion vector signal to determine the track of the instruction object according to the first sensing image signal and the second sensing image signal;

wherein the instruction object moves within a first zone of the sensing array.

2. The optical touch-control system of claim 1, further comprising a processor for controlling the movement of the objective according to the motion vector signal and the predetermined period.

3. The optical touch-control system of claim 1, further comprising:

a proximity detector for determining an instruction distance between the instruction object and the optical touch-control system;

wherein the motion detector is turned off when the proximity detector determines the instruction distance is larger than a predetermined value.

4. The optical touch-control system of claim 1, wherein the motion vector signal comprises a moving distance information and a moving direction information, the moving direction information is for moving the objective, and the moving distance information and the predetermined period are for generating a velocity information to move the objective according to the velocity information and the moving distance information.

5. The optical touch-control system of claim 1, wherein when the instruction object moves into a second zone of the sensing array and pauses within the second zone, the objective will continuously move according to the motion vector signal of the paused instruction object.

6. The optical touch-control system of claim 5, wherein the objective continuously moves according to a predetermined velocity information.

7. The optical touch-control system of claim 1, further comprising a filter located in the sensing array to filter out light which is not emitted from the light source.

8. A method for controlling an optical touch-control system to move an objective within a display panel according to a detected track, the method comprising:

continuously sampling a specific light reflected by an instruction object in a predetermined period, to accordingly generate a first image signal related to a first sensing image signal and a second image signal related to a second sensing image signal; and

outputting a motion vector signal to determine the track of the instruction object according to the first sensing image signal and the second sensing image signal;

wherein the instruction object moves within a first zone of the sensing array.

9. The method of claim 8, wherein controlling the movement of the objective according to the motion vector signal and the predetermined period, further comprises:

moving the objective according to a moving direction information of the motion vector signal;

generating a velocity information according to a moving distance information and the predetermined period of the motion vector signal; and

moving the objective according to the moving distance information and the velocity information.

10. The method of claim 8, further comprising:

detecting a distance between the instruction object and the optical touch-control system.

11. The method of claim 10, wherein when the distance between the instruction object and the optical touch-control system is larger than a predetermined value, stopping detecting the motion vector signal of the instruction object.

12. The method of claim 8, further comprising:

detecting a position of the instruction object related to the optical touch-control system; and

when the position locates and pauses within a specific zone of the optical touch-control system, the objective will continuously move according to the motion vector signal of the paused instruction object.

13. The method of claim 12, wherein the step of controlling the objective to continuously move comprises:

controlling the objective to continuously move according to a predetermined velocity information.