Touch display panel and method for driving the same

• US 10,379,686 B2
• Filed: 01/05/2017
• Issued: 08/13/2019
• Est. Priority Date: 04/20/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Xu, Zhiqiang, Zhao, Jiayang
• Primary Examiner(s): Rabindranath, Roy P
• Application Number:
  US15/544,986
• Publication Number:
  US 20180157352A1
• Time in Patent Office: 950 Days
• Field of Search: 345173-178
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

The present disclosure relates to a touch display panel including: a first touch electrode which is an unitary electrode; a second touch electrode, the second touch electrode including a plurality of second touch sub-electrodes; a detection unit for detecting a change in the capacitance value between the first touch electrode and each second touch sub-electrode of the second touch electrode and determining a touch position as a function of the position(s) of the corresponding second touch sub-electrode(s) which produce(s) a change in the capacitance value. The present disclosure also relates to a method for driving a touch display panel.

Claims

1. A method for driving a touch display panel, wherein the touch display panel comprises:

a first touch electrode and a second touch electrode comprising a plurality of second touch sub-electrodes; and

the driving method comprises;

inputting a waveform signal to the second touch electrode to charge and discharge the capacitance between the first touch electrode and the second touch electrode;

detecting a change in the capacitance value between the first touch electrode and each second touch sub-electrode of the second touch electrode; and

determining a touch position as a function of the position(s) of the corresponding second touch sub-electrode(s) which produce(s) a change in the capacitance values,

detecting the magnitude of the change in the capacitance value between the first touch electrode and each second touch sub-electrode of the second touch electrode;

controlling the touch display panel to perform a first operation when the change in the capacitance value is less than the first preset value; and

controlling the touch display panel to perform a second operation which is different from the first operation when the change in capacitance value is greater than the first preset value and is less than a second preset value,

detecting changes in the capacitance value between the first touch electrode and the plurality of second touch sub-electrodes simultaneously; and

determining a plurality of touch positions as a function of the positions of the plurality of corresponding second touch sub-electrodes which produce changes in the capacitance value,

controlling the touch display panel to perform a third operation which is different from the first operation and the second operation when the change in capacitance value is greater than the second preset value,

the first operation, the second operation, and the third operation are an operation selected from operations of a click operation, an operation of a pop-up menu, and an operation of the uninstallation of an application program, respectively.

2. The method for driving a touch display panel according to claim 1, wherein the change in the capacitance value between the first touch electrode and each of the second touch sub-electrodes is detected as a function of a change in discharge time of each second touch sub-electrodes.

3. The method for driving a touch display panel according to claim 1, wherein a display signal and a touch signal are controlled alternatively in a time-multiplexed manner.