Touch display device

Patent metadata

Field	Value
Publication number	US-11768563-B2
Application number	US-202217972461-A
Country	US
Kind code	B2
Filing date	Oct 24, 2022
Priority date	Dec 30, 2021
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A touch display device includes a display controller configured to output a control signal and a first touch synchronization signal defining a display period and a touch period, a gate driving circuit configured to receive a high-level gate voltage and the control signal, and output a gate voltage pulse, a display panel comprising gate lines to which the gate voltage pulse is input and sub-pixels, a touch controller configured to receive the first touch synchronization signal, and output a pulse width modulation signal, and a touch power circuit configured to output a voltage generated based on the pulse width modulation signal to the gate driving circuit in at least a first period of the touch period, and output the high-level gate voltage to the gate driving circuit based on a second touch synchronization signal that defines a pseudo display period in a second period of the touch period.

First claim

What is claimed is:

1. A touch display device comprising:
a display controller configured to generate and output a first touch synchronization signal and a control signal, the first touch synchronization signal defining a display period and a touch period;
a gate driving circuit configured to receive a high-level gate voltage and the control signal, and generate and output a gate voltage pulse according to the high-level gate voltage and the control signal;
a display panel comprising a plurality of gate lines to which the gate voltage pulse is input and a plurality of sub-pixels that are electrically connected to the plurality of gate lines;
a touch controller configured to receive the first touch synchronization signal, and generate and output a pulse width modulation signal; and
a touch power circuit configured to output a voltage that is generated based on the pulse width modulation signal to the gate driving circuit in at least a first period of the touch period, and output the high-level gate voltage to the gate driving circuit based on a second touch synchronization signal that defines a pseudo display period in a second period of the touch period that is after the first period.

2. The touch display device of claim 1 , wherein the second period is a remaining period of the touch period and the pseudo display period overlaps the remaining period of the touch period and the display period that is after the touch period.

3. The touch display device of claim 1 , wherein the display controller generates and outputs the second touch synchronization signal based on a preset time interval.

4. The touch display device of claim 1 , wherein the touch controller generates and outputs the second touch synchronization signal based on a preset time interval.

5. The touch display device of claim 4 , wherein the touch controller generates the second touch synchronization signal based on the first touch synchronization signal.

6. The touch display device of claim 1 , wherein the touch power circuit generates and outputs a touch electrode driving signal based on the first touch synchronization signal and the pulse width modulation signal,
wherein the display panel comprises a plurality of touch electrodes to which the touch electrode driving signal is input during the touch period to sense touch of the plurality of touch electrodes.

7. The touch display device of claim 1 , wherein the display panel comprises a peripheral line that electrically connects together the touch power circuit and the gate driving circuit, the peripheral line applied with a voltage that is generated based on the pulse width modulation signal.

8. The touch display device of claim 7 , wherein a voltage level of the high-level gate voltage is a first voltage level, and the voltage generated based on the pulse width modulation signal varies in a voltage level range that is less than the first voltage level.

9. The touch display device of claim 8 , wherein a lowest voltage level in the voltage level range is a second voltage level,
wherein a length of a period during which the high-level gate voltage applied to the peripheral line rises from the second voltage level to the first voltage level is less than or equal to a time interval between a starting time of the display period and a starting time of the pseudo display period.

10. The touch display device of claim 1 , wherein a high-level of the second touch synchronization signal defines the pseudo display period.

11. A touch display device comprising:
a display panel comprising a substrate, a plurality of sub-pixels on the substrate, a plurality of data lines and a plurality of gate lines electrically connected to the plurality of sub-pixels, and a plurality of touch electrodes overlapping at least one sub-pixel among the plurality of sub-pixels;
a gate driving circuit configured to receive a high-level gate voltage through a peripheral line disposed on the substrate, and output a gate voltage pulse to the plurality of gate lines according to the high-level gate voltage;
a first circuit configured to output a pulse width modulation signal;
a second circuit configured to output a touch electrode driving signal having a same frequency as the pulse width modulation signal to one or more of the plurality of touch electrodes; and
a third circuit configured to output a signal having the same frequency as the pulse width modulation signal to the gate driving circuit through the peripheral line, the signal outputted during a period in which the second circuit outputs the touch electrode driving signal to at least one touch electrode among the plurality of touch electrodes;
wherein a voltage applied to the peripheral line increases to a second voltage level that is greater than a first voltage level of a signal for display before the signal is applied to the at least one touch electrode during the display period.

12. The touch display device of claim 11 , wherein the voltage applied to the peripheral line decreases from the second voltage to a third voltage level that is less than the first voltage level in a period in which the second circuit outputs the touch electrode driving signal to at least one of the plurality of touch electrodes.

13. The touch display device of claim 12 , wherein a time point at which the gate driving circuit resumes output of an on-level gate voltage pulse for display during the display period is after the voltage applied to the peripheral line increases from the third voltage level to the second voltage level.

14. The touch display device of claim 12 , wherein a period in which a voltage level of the peripheral line increases from the third voltage level to the high-level gate voltage is less than a time interval between a time point when the voltage level of the peripheral line starts to increase from the third voltage level and a time point when the gate driving circuit resumes outputting a gate voltage pulse for display to any one of the plurality of gate lines during the display period.

15. The touch display device of claim 11 , wherein the second voltage level is the high-level gate voltage level.

16. A touch display device comprising:
a display panel comprising a substrate, a plurality of sub-pixels on the substrate, a plurality of data lines and a plurality of gate lines electrically connected to the plurality of sub-pixels, and a plurality of touch electrodes overlapping at least one sub-pixel among the plurality of sub-pixels;
a plurality of signal generating circuits configured to generate a high-level gate voltage, a first touch synchronization signal defining a touch period and a display period that is after the touch period, and a second touch synchronization signal defining a first period and a second period that is after the first period, the first period overlapping a first portion of the touch period and the second period overlapping the display period and a second portion of the touch period that is after the first portion of the touch period; and
a gate driving circuit configured to receive the high-level gate voltage through a peripheral line, and output a gate signal to the plurality of gate lines during the display period according to the high-level gate voltage,
wherein during the second period of the second touch synchronization signal that overlaps the second portion of the touch period, the high-level gate voltage applied to the peripheral line increases from a first voltage level to a second voltage level that is greater than the first voltage level and reaches the second voltage level by at least a start of the display period defined by

Assignees

• Lg Display Co Ltd

Inventors

• Kim Sunyeop
• Kim Sungchul
• Kim Hoonbae
• Lee Junghan
• Kang Seongkyu

Classifications

• G06F3/04184 Primary

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0443 Primary

  using a single layer of sensing electrodes · CPC title

• G06F3/041662

  using alternate mutual and self-capacitive scanning · CPC title

• G06F2203/04106

  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 title