Method for recognizing multiple capacitive styluses, touch control unit, touch panel and system

• US 11,126,299 B2
• Filed: 03/08/2018
• Issued: 09/21/2021
• Est. Priority Date: 03/08/2018
• Status: Active Grant

• Current Assignee: Infovision Optoelectronics Company Limited (Digital China Information Service Co., Ltd.)
• Original Assignee: Infovision Optoelectronics Company Limited (Digital China Information Service Co., Ltd.)
• Inventors: Chiu, Fengching, Wang, Pengfei
• Primary Examiner(s): Pervan, Michael
• Application Number:
  US16/965,012
• Publication Number:
  US 20210055861A1
• Time in Patent Office: 1,293 Days
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/03545 Pens or stylus
• 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 3/041662 using alternate mutual and self-capacitive scanning
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0442 using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser

Abstract

The present invention discloses a method for recognizing multiple active capacitive styluses, a touch control unit, a touch panel, and a touch system. The method includes the steps of: obtaining recognization signals sent by multiple active capacitive styluses, and recognizing coordinates of each active capacitive stylus and its report point removing ghost point coordinates from the report point coordinates in a mutual capacitive mode of a work cycle of a touch panel, to obtain actual coordinates of each active capacitive stylus. The present invention accurately recognizes the specific positions of the multiple active capacitive styluses by eliminating the coordinates of the ghost points and has the advantages of high positioning accuracy and strong user experience.

Claims

1. A method for recognizing multiple active capacitive styluses, wherein the method comprises the steps of:

obtaining recognization signals sent by multiple active capacitive styluses, and recognizing coordinates of each active capacitive stylus and its report point;

removing ghost point coordinates from the report point coordinates in a mutual capacitive mode of a work cycle of a touch panel, to obtain actual coordinates of each active capacitive stylus.

2. The method for recognizing multiple active capacitive styluses of claim 1, wherein the recognization signals sent by the multiple active capacitive styluses are obtained by controlling a transmit electrode or a receive electrode of the touch panel.

3. The method for recognizing multiple active capacitive styluses of claim 1, wherein before the step of removing the ghost point coordinates from the report point coordinates in the mutual capacitive mode of the work cycle of the touch panel, to obtain the actual coordinates of each active capacitive stylus, the method further comprises:

enabling the mutual capacitive mode of the touch panel.

4. The method for recognizing multiple active capacitive styluses of claim 1, wherein after the step of removing the ghost point coordinates from the report point coordinates in the mutual capacitive mode of the work cycle of the touch panel, to obtain the actual coordinates of each active capacitive stylus, the method further comprises:

reporting the actual coordinates of each active capacitive stylus.