Touch panel and drive circuit thereof

Patent metadata

Field	Value
Publication number	US-9733755-B2
Application number	US-201514849533-A
Country	US
Kind code	B2
Filing date	Sep 9, 2015
Priority date	May 8, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A drive circuit of a touch panel includes a signal selection circuit and a de-multiplexing circuit, where in a display phase, the signal selection circuit is configured to forward a display signal to the de-multiplexing circuit, which is configured to de-multiplex the display signal and transmit signals resulting from the de-multiplexing of the display signal to the data lines; and in a touch phase, the signal selection circuit is configured to forward a touch driving signal to the de-multiplexing circuit, which is configured to de-multiplex the touch driving signal and transmit signals resulting from the de-multiplexing of the touch driving signal to the data lines, so that the pulse signals on the data lines are identical to the pulse signals on the touch driving signal lines and touch electrodes in the touch phase due to the signal selection circuit.

First claim

I claim:

1. A drive circuit of a touch panel, comprising a signal selection circuit and a de-multiplexing circuit,
wherein a first input terminal of the signal selection circuit is connected with a touch driving signal input line for transmission of a touch driving signal,
a second input terminal of the signal selection circuit is connected with a display signal input line for transmission of a display signal, and
an output terminal of the signal selection circuit is connected with an input terminal of the de-multiplexing circuit;
an output terminal of the de-multiplexing circuit is connected with a plurality of pixel electrodes through respective data lines:
in a display phase, the signal selection circuit is configured to forward the display signal received from the display signal input line to the de-multiplexing circuit, which is configured to de-multiplex the display signal from the signal selection circuit and transmit signals resulting from the de-multiplexing of the display signal to the data lines; and
in a touch phase, the signal selection circuit is configured to forward the touch driving signal received from the touch driving signal input line to the de-multiplexing circuit, which is configured to de-multiplex the touch driving signal from the signal selection circuit and transmit signals resulting from the de-multiplexing of the touch driving signal to the data lines
wherein the signal selection circuit comprises a first switch and a second switch,
wherein the first switch is configured to connect a first input terminal of the signal selection circuit to an output terminal of the signal selection circuit, and the second switch is configured to connect a second input terminal of the signal selection circuit to the output terminal of the signal selection circuit.

2. The drive circuit of the touch panel of claim 1 , wherein a control terminal, an input terminal and an output terminal of the first switch are connected with a first control line, the display signal input line and an input terminal of the de-multiplexing circuit, respectively, while a control terminal, an input terminal and an output terminal of the second switch are connected with a second control line, the touch driving signal input line and the input terminal of the de-multiplexing circuit, respectively.

3. The drive circuit of the touch panel of claim 1 , wherein the first switch and the second switch are Thin Film Transistors.

4. The drive circuit of the touch panel of claim 1 , wherein the de-multiplexing circuit comprises a third switch, a fourth switch and a fifth switch, wherein an output terminal of the third switch is connected with a first sub-pixel electrode, an output terminal of the fourth switch is connected with a second sub-pixel electrode, and an output terminal of the fifth switch is connected with a third sub-pixel electrode; a control terminal of the third switch is connected with a first clock signal, a control terminal of the fourth switch is connected with a second clock signal, and a control terminal of the fifth switch is connected with a third clock signal; each of an input terminal of the third switch, an input terminal of the fourth switch and an input terminal of the fifth switch is connected with an output terminal of the first switch and an output terminal of the second switch; and an input terminal of the first switch is connected with the touch driving signal input line for transmission of the touch driving signal, and an input terminal of the second switch is connected with the display signal input line for transmission of the display signal.

5. The drive circuit of the touch panel of claim 4 , wherein the third switch, the fourth switch and the fifth switch are embodied as N-type Thin Film Transistors, or as P-type Thin Film Transistors.

6. A touch panel, comprising
a color filter substrate,
an array substrate disposed opposite to the color filter substrate, and
a drive circuit of a touch panel; wherein the drive circuit of a touch panel, comprising
a signal selection circuit and a de-multiplexing circuit,
wherein a first input terminal of the signal selection circuit is connected with a touch driving signal input line for transmission of a touch driving signal,
a second input terminal of the signal selection circuit is connected with a display signal input line for transmission of a display signal, and
an output terminal of the signal selection circuit is connected with an input terminal of the de-multiplexing circuit;
an output terminal of the de-multiplexing circuit is connected with a plurality of pixel electrodes through respective data lines;
in a display phase, the signal selection circuit is configured to forward the display signal received from the display signal input line to the de-multiplexing circuit, which is configured to de-multiplex the display signal from the signal selection circuit and transmit signals resulting from the de-multiplexing of the display signal to the data lines; and
in a touch phase, the signal selection circuit is configured to forward the touch driving signal received from the touch driving signal input line to the de-multiplexing circuit, which is configured to de-multiplex the touch driving signal from the signal selection circuit and transmit signals resulting from the de-multiplexing of the touch driving signal to the data lines
wherein the signal selection circuit comprises a first switch and a second switch,
wherein the first switch is configured to connect a first input terminal of the signal selection circuit to an output terminal of the signal selection circuit, and the second switch is configured to connect a second input terminal of the signal selection circuit to the output terminal of the signal selection circuit.

7. The touch panel of claim 6 , wherein the de-multiplexing circuit and the signal selection circuit are disposed at a non-display region of the array substrate of the touch panel.

8. The touch panel of claim 6 , wherein at least two common electrode blocks are provided at a display region of the array substrate, and each of the at least two common electrode blocks is connected with a touch driving signal line,
in a display phase, a common voltage is applied to the at least two common electrode blocks via touch driving signal lines; and
in a touch phase, touch driving signals are applied to the at least two common electrode blocks via the touch driving signal lines.

Assignees

• Xiamen Tianma Micro Electronics Co Ltd
• Tianma Microelectronics Co Ltd

Inventors

• Yang Yizhi

Classifications

• G09G3/20

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/044

  by capacitive means · CPC title