METHOD FOR PREVENTING FALSE ACTIVATION OF TOUCH PAD

• US 20150091860A1
• Filed: 09/29/2014
• Published: 04/02/2015
• Est. Priority Date: 09/27/2013
• Status: Abandoned Application

• Current Assignee: Tianjin Funayuanchuang Technology Co., Ltd.
• Original Assignee: Tianjin Funayuanchuang Technology Co., Ltd.
• Inventors: SHIH, PO-SHENG, CHENG, CHIEN-YUNG, CHAO, LI-MIN
• Application Number:
  US14/499,463
• Publication Number:
  US 20150091860A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/04186 Touch location disambiguation

Abstract

A method for preventing a false activation of a touch pad is provided. In the method, a touch area of the touch pad is divided into subareas. A lock threshold N_lock and a sensing signal threshold V_lock are set. The touch pad is scanned when there is a touch acted on the touch pad. A quantity N_i of touch points in each of the subareas is counted. If the quantity N_i of the touch points in a certain subarea is less than N_lock, the one subarea is maintained touchable, if not, the certain subarea is maintained untouchable.

Claims

1. A method for preventing a false activation of a touch pad, the touch pad defining a touch area, the method comprising:

setting a lock threshold N_lock and a sensing signal threshold V_lock;

scanning the touch pad and detecting a plurality of touch nodes in each of a plurality of subareas of the touch pad and a sensing signal value V_i corresponding to each of the touch nodes when there is a touch acted on the touch area;

determining if the sensing signal value V_i corresponding to each of the plurality of touch nodes is larger than or equals to the sensing signal threshold V_lock,

determining a certain touch node being as a touch point when the sensing signal value V_i corresponding to the certain node is larger than or equals to the sensing signal threshold V_lock;

counting a quantity N_i of touch points in each of the plurality of subareas;

determining if the quantity N_i of the touch points in each of the plurality of subareas is less than the lock threshold N_lock;

maintaining a certain subarea being touchable when the quantity N_i of the touch points in the certain subarea is less than the lock threshold N_lock; and

maintaining the certain subarea being untouchable when the quantity N_i of the touch points in the certain subarea is larger than or equals to the lock threshold N_lock.

2. The method of claim 1, wherein the plurality of subareas cover the entire touch area and at least two adjacent subareas are partially overlapped with each other.

3. The method of claim 1, wherein the plurality of subareas are defined along a length extending direction of the touch pad, the plurality of subareas comprises side subareas and central areas located between the side subareas, the side subareas are partially overlapped and the central areas are not overlapped.

4. The method of claim 1, wherein all adjacent subareas in the plurality of subareas partially overlap with each other.

5. The method of claim 1, wherein the plurality of subareas adjoin in sequence and do not overlap with each other.

6. The method of claim 1, wherein the lock threshold N_lock is a number or a numerical range substantially equals to a quantity of the touch points detected when a palm of a user touches the touch pad.

7. The method of claim 6, wherein the lock threshold N_lock is the number and equals to 20.

8. The method of claim 1 further comprising a step of monitoring each of the plurality of subareas to dynamically convert the individual subarea touchable or untouchable.

9. The method of claim 1 further comprising a step of activating an untouchable subarea to be a touchable subarea comprising:

setting a lock time period T_lock;

recording a duration time period T_i of the untouchable subarea since being untouchable;

determining if the duration time period T_i exceeds the lock time period T_lock;

continuously maintaining the untouchable subarea being untouchable when the duration time period T_i does not exceed the lock time period T_lock;

redetecting a quantity N′

_i of the touch points in the untouchable subarea when the duration time period T_i exceeds the lock time period T_lock; and

activating the untouchable subarea to be a touchable subarea when N′

_i≦

N_lock.

10. The method of claim 1 further comprising a step of activating an untouchable subarea to be a touchable subarea comprising:

setting a lock time period T_lock and an activating threshold N_activate of a touch point quantity, and N_activate<

N_lock;

recording a duration time period T_i of the untouchable subarea since being untouchable;

determining if the duration time period T_i exceeding the lock time period T_lock;

continuously maintaining the untouchable subarea being untouchable when the duration time period T_i does not exceed the lock time period T_lock;

redetecting a quantity N′

_i of the touch points in the untouchable subarea when the duration time period T_i exceeds the lock time period T_lock;

further determining if N′

_I is larger than or equals to N_lock;

continuously maintaining the untouchable subarea being untouchable when N′

_i≧

N_lock;

further determining if N′

_i is less than N_activate;

maintaining untouchable subarea being untouchable when N′

_i≧

N_activate; and

activating the untouchable subarea to be the touchable subarea when N′

_i<

N_activate.

11. The method of claim 1 further comprising a step of activating an untouchable subarea to a touchable subarea comprising:

setting a lock time period T_lock and an activating threshold N_activate of a touch point quantity, and N_activate<

N_lock;

recording a duration time period T_i of the untouchable subarea since being untouchable;

determining if the duration time period T_i exceeds the lock time period T_lock;

continuously maintaining the untouchable subarea being untouchable when the duration time period T_i does not exceed the lock time period T_lock;

redetecting a quantity N′

_i of the touch points in the untouchable subarea when the duration time period T_i exceeds the lock time period T_lock;

further determining if N′

_i is less than N_activate;

maintaining untouchable subarea being untouchable when N′

_i≧

N_activate; and

activating the untouchable subarea to be the touchable subarea when N′

_i<

N_activate.

12. The method of claim 9, wherein the lock time period T_lock is a time value in a range from about 0.5 seconds to about 1 second.

13. The method of claim 10, wherein the lock time period T_lock is a time value in a range from about 0.5 seconds to about 1 second.

14. The method of claim 11, wherein the lock time period T_lock is a time value in a range from about 0.5 seconds to about 1 second.

15. The method of claim 10, wherein a ratio of N_activate to N_lock is set as:

N_activate;

N_lock=0.6;

1 to 0.9;

1.

16. The method of claim 11, wherein a ratio of N_activate to N_lock is set as:

N_activate;

N_lock=0.6;

1 to 0.9;

1.