Touch display panel and method for driving touch display panel

Patent metadata

Field	Value
Publication number	US-10488974-B2
Application number	US-201715740522-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Sep 27, 2017
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

An embodiment of the present application discloses a touch display panel and a method for driving the touch display panel. Wherein, the touch display panel includes a plurality of first conductive lines, a plurality of second conductive lines, and pixel units located at intersections of the first conductive lines and the second conductive lines. The pixel units are electrically connected to the first conductive lines and the second conductive lines; a first switch and a second switch respectively disposed at two ends of the first conductive lines along the first direction, a third switch and a fourth switch respectively disposed at two ends of the second conductive lines along the second direction, the first direction perpendicular to the second direction, the touch display panel in a display state or a touch sensing state with a time division manner. The application can achieve the multiplexing of the display and the touch.

First claim

What is claimed is:

1. A touch display panel, comprising:
a plurality of first conductive lines extending in a first direction and insulated from each other, a plurality of second conductive lines extending in a second direction and insulated from each other, and pixel units located at intersections of the first conductive lines and the second conductive lines, the pixel units electrically connected to the first conductive lines and the second conductive lines;
a first switch and a second switch respectively disposed at two ends of the first conductive lines along the first direction, a third switch and a fourth switch respectively disposed at two ends of the second conductive lines along the second direction, the first direction perpendicular to the second direction, the touch display panel in a display state or a touch sensing state with a time division manner;
when the touch display panel in a display state, the first switch and the third switch in an off state, the second switch and the fourth switch in an on state, the first conductive lines transmitting scanning driving signals to the pixel units, and the second conductive lines transmitting image display signals to the pixel units, making the pixel units to perform image display; and
when the touch display panel in the touch sensing state, the first switch and the third switch in the on state, the second switch and the fourth switch in the off state, the first conductive lines and the second conductive lines forming touch sensing capacitors, and the first conductive lines receiving touch driving signals, the second conductive lines used for outputting touch sensing signals to recognize touch operations received by the touch display panel;
wherein the touch display panel further comprises a touch circuit and a display circuit, the touch circuit is electrically connected to the first conductive lines through the first switch and electrically connected to the second conductive lines through the third switch, the display circuit is electrically connected to the first conductive lines through the second switch and electrically connected to the second conductive lines through the fourth switch;
the first switch configured to selectively control whether the first conductive lines electrically connected to the touch circuit, the touch circuit configured to output the touch driving signals to the first conductive lines when being electrically connected to the first conductive lines;
the second switch configured to selectively control whether the first conductive lines electrically connected to the display circuit, the display circuit configured to output the scanning driving signals to the first conductive lines when being electrically connected to the first conductive lines;
the third switch configured to selectively control whether the second conductive lines electrically connected to the touch circuit, the touch circuit further configured to receive the touch sensing signals from the second conductive lines when being electrically connected to the second conductive lines; and
the fourth switch configured to selectively control whether the second conductive lines electrically connected to the display circuit, the display circuit further configured to output the image display signals to the second conductive lines when being electrically connected to the second conductive lines.

2. The touch display panel according to claim 1 , wherein
in a first time period, the touch display panel is in the display state, the first switch is in the off state, the first conductive lines is electrically disconnected from the touch circuit, the second switch is in the on state, the first conductive lines is electrically connected to the display circuit, the first conductive lines receives the scanning driving signals output from the display circuit, and in a second time period, the touch display panel is in the touch sensing state, the first switch is in the on state, the first conductive lines is electrically connected to the touch circuit, the second switch is in the off state, the first conductive lines is disconnected from the display circuit, the first conductive lines receives the touch driving signals outputted from the touch circuit; and
in the first time period, the third switch is in the off state, the second conductive lines is disconnected from the touch circuit, the fourth switch is in the on state, the second conductive lines receives the image display signals outputted from the display circuit, and in the second time period, the third switch is in the on state, the second conductive lines is electrically connected to the touch circuit, the fourth switch is in the off state, the second conductive lines is electrically connected to the touch circuit, the second conductive lines outputs the touch sensing signals to the touch circuit.

3. The touch display panel according to claim 1 , wherein when the touch display panel is in the touch sensing state, n first conductive lines are defined as a group, the plurality of the first conductive lines extending in the first direction and insulated from each other comprise x groups, each of the first conductive lines in each group simultaneously receives the touch driving signals output from the touch circuit, m second conductive lines are defined as a group, the plurality of second conductive lines extending in the second direction and insulated from each other comprise y groups, each of the y groups of each second conductive lines simultaneously outputs the touch sensing signals to the touch circuit, n, x, m, y are positive integer greater than 1.

4. The touch display panel according to claim 3 , wherein the touch circuit outputs the touch driving signals to the first conductive lines of each group with a time division manner, and simultaneously receives the touch sensing signals outputted by the second conductive lines of each group.

5. The touch display panel according to claim 4 , wherein when the touch display panel is in the touch sensing state, the touch driving signals are in a negative potential state.

6. A method for driving a touch display panel, comprising:
the touch display panel comprising a plurality of first conductive lines, a plurality of second conductive lines, a first switch and a second switch disposed at two ends of the first conductive lines, a third switch and a fourth switch disposed at the second conductive lines, a pixel unit located at an intersection of the first conductive lines and the second conductive lines, and comprising a plurality of continuous working periods, each working period comprising:
in a first time period, controlling the first switch and the third switch to be turned off, the second switch and the fourth switch to be turned on, to make scanning driving signals to be applied to the first conductive lines, image display signals transmitted to the pixel unit through the second conductive lines, the touch display panel performing image display; and
in a second time period, the first conductive lines and the second conductive lines forming a touch sensing capacitor to control the first switch and the third switch to be turned on, the second switch and the fourth switch to be turned off, making touch driving signals applied to the first conductive lines, and touch sensing signals outputted from the second conductive lines, the touch display panel performing touch sensing, wherein the first time period and the second time period are continuous and do not intersect to each other;
wherein the touch display panel further comprises a touch circuit and a display circuit, the method further comprises:
controlling the first switch to be turned on or off to selectively control whether the first conductive lines electrically connected to the touch circuit, and the touch driving signals

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Huang yao-li
• He Xinglong

Classifications

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title