Touch display device, display controller, driving circuit, and driving method

Patent metadata

Field	Value
Publication number	US-2020004367-A1
Application number	US-201916453271-A
Country	US
Kind code	A1
Filing date	Jun 26, 2019
Priority date	Jun 28, 2018
Publication date	Jan 2, 2020
Grant date	—

Abstract

A touch display device, a display controller, a driving circuit, and a driving method. Even in the case that a rate (or an input cycle) at which an image supply device supplies image data is not synchronized with a rate (or a beacon cycle) at which a beacon signal for pen sensing is output to the display panel, display processing and touch sensing (e.g., pen sensing or finger sensing) is performed ordinarily by controlling data output processing.

First claim

1 . A touch display device, comprising:
a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes; a gate driving circuit electrically connected to the display panel, the gate driving circuit configured to sequentially output gate signals to the plurality of gate lines to drive the plurality of gate lines; a data driving circuit electrically connected to the display panel, the data driving circuit configured to receive digital output image data, and configured to convert the digital output image data into analog data signals, and configured to output the analog data signals to the plurality of data lines to drive the plurality of data lines; a touch driving circuit configured to output a beacon signal, directed to one or more pens in contact with or adjacent to the display panel, to one or more touch electrodes among the plurality of touch electrodes, and the touch driving circuit configured to output a first beacon signal during a first beacon transmission period, a second beacon signal during a second beacon transmission period, and a third beacon signal during a third beacon transmission period, according to a predetermined beacon cycle; and a display controller configured to store input image data in a memory and configured to output image data, corresponding to the input image data stored in the memory, to the data driving circuit, and wherein the display controller is further configured to:
receive first input image data, second input image data, and third input image data according to an input cycle corresponding to a different value from the beacon cycle;
output first output image data, second output image data, and third output image data corresponding to the first input image data, the second input image data, and the third input image data, respectively;
output the first output image data between the first beacon transmission period and the second beacon transmission period; and
output the second output image data, re-output the first output image data, or hold data output processing between the second beacon transmission period and the third beacon transmission period.

2 . The touch display device according to claim 1 , wherein, if the first output image data is re-output or the data output processing is held between the second beacon transmission period and the third beacon transmission period, the display controller is configured to output the second output image data and the third output image data according to an output cycle corresponding to the beacon cycle after the third beacon signal is output.

3 . The touch display device according to claim 1 , wherein, if the display controller holds the data output processing between the second beacon transmission period and the third beacon transmission period, the gate driving circuit turns the plurality of gate lines off.

4 . The touch display device according to claim 1 , wherein, if the display controller re-outputs the first output image data between the second beacon transmission period and the third beacon transmission period, the gate driving circuit sequentially turns the plurality of gate lines on.

5 . The touch display device according to claim 1 , wherein the input cycle is defined as a value greater than the beacon cycle.

6 . The touch display device according to claim 1 , wherein the beacon cycle corresponds to an interval of blank periods.

7 . The touch display device according to claim 1 , wherein the touch driving circuit outputs the first beacon signal, the second beacon signal, and the third beacon signal in a first blank period, a second blank period, and a third blank period, respectively.

8 . The touch display device according to claim 1 , wherein the beacon signal is a pulse-modulated signal comprising a plurality of pulses including information for pen sensing.

9 . The touch display device according to claim 1 , wherein the touch driving circuit is configured to output a fourth beacon signal and a fifth beacon signal at a different timing from the first beacon signal, the second beacon signal, and the third beacon signal, and is configured to supply a direct current voltage to the one or more touch electrodes among the plurality of touch electrodes between a fourth beacon transmission period in which the fourth beacon signal is output and a fifth beacon transmission period in which the fifth beacon signal is output.

10 . The touch display device according to claim 9 , wherein, while the touch driving circuit is supplying the direct current voltage to the one or more touch electrodes among the plurality of touch electrodes, the touch driving circuit receives one or more pen signals output from the one or more pens via the display panel.

11 . The touch display device according to claim 9 , wherein, between the fourth beacon transmission period and the fifth beacon transmission period, the touch driving circuit supplies a driving synchronization signal to the one or more touch electrodes among the plurality of touch electrodes before supplying the direct current voltage to the one or more touch electrodes among the plurality of touch electrodes.

12 . The touch display device according to claim 11 , wherein the driving synchronization signal is a ping signal comprising one or more pulses having a predetermined pulse width.

13 . The touch display device according to claim 1 , wherein, during a period between the first beacon transmission period and the second beacon transmission period,
the display controller outputs the first output image data to the data driving circuit, the display controller converts the first output image data, in a form of digital signals, into analog first data signals, and outputs the analog first data signals to the plurality of data lines, and the touch driving circuit outputs a touch electrode driving signal with a predetermined amplitude to the one or more touch electrode among the plurality of touch electrodes.

14 . The touch display device according to claim 13 , wherein, during the period between the first beacon transmission period and the second beacon transmission period, the first data signals have a voltage changed by a value equal to the amplitude of the touch electrode driving signal.

15 . The touch display device according to claim 13 , wherein, during the period between the first beacon transmission period and the second beacon transmission period:
the gate driving circuit sequentially outputs the gate signals to the plurality of gate lines; a turn-off signal portion of each of the gate signals being a modulated turn-off gate voltage swinging with the amplitude of the touch electrode driving signal; and a turn-on signal portion of each of the gate signals being a modulated turn-on gate voltage swinging with the amplitude of the touch electrode driving signal.

16 . A touch display device, comprising:
a display panel in which a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes are disposed; a gate driving circuit electrically connected to the display panel, the gate driving circuit sequentially outputting gate signals to the plurality of gate lines to drive the plurality of gate lines; a data driving circuit electrically connected to the display panel, the data driving circuit receiving output image data, in a form of digital signals, converting the output image data into analog data signals, and outputting the analog data signals to the plurality of data lines to drive the plurality of data lines, and the data driving circuit holding output of the analog data sig

Assignees

• Lg Display Co Ltd

Inventors

• Lee Sunghoon
• Shin Seungmok
• Kim Hoonbae
• Kim Sunyeop

Classifications

• G06F3/04883

  for inputting data by handwriting, e.g. gesture or text · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/03545

  Pens or stylus · CPC title

• G06F2203/0381

  Multimodal input, i.e. interface arrangements enabling the user to issue commands by simultaneous use of input devices of different nature, e.g. voice plus gesture on digitizer · CPC title

• G06F3/044

  by capacitive means · CPC title