Simultaneous display and touch scanning methods and devices of touch display panels

Patent metadata

Field	Value
Publication number	US-10318068-B2
Application number	US-201715327844-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	Dec 30, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The present disclosure relates to a driving method and a driving device of touch display panels, and a touch display. The driving method includes: detecting a voltage potential of at least one pixel electrode within the areas of the touch display panel corresponding to different touch scanning partitions, negating the voltage potential, overlapping the negated voltage potential and feed-backed touch pulse signals, and adopting overlapped signals to be the detected touch pulse signals. With the configuration of the touch scanning partitions, the voltage potentials of the pixel electrodes within each of the areas are adopted to respectively adjust the feed-backed touch pulse signals such that the display scanning and the touch scanning can be conducted simultaneously. The detection precision of the touch pulse signals may be enhanced without affecting the display performance.

First claim

What is claimed is:

1. A touch display, comprising:
a touch display panel and a driving device connecting to the touch display panel;
the driving device comprising:
a voltage detection circuit connecting to the touch display panel, and the voltage detection circuit being configured for detecting at least one voltage potential of pixel electrodes within areas of the touch display panel, and the areas corresponding to different touch scanning partitions;
a compensation noise-deduction circuit connecting to the voltage detection circuit, and the compensation noise-deduction circuit being configured for negating the voltage potential detected by the voltage detection circuit, overlapping the negated voltage potential and feed-backed touch pulse signals, and adopting overlapped signals as the detected touch pulse signals; and
wherein the touch display further comprising a touch pulse processing circuit connecting to the compensation noise-deduction circuit, and the touch pulse processing circuit being configured for recognizing the touch pulse signals and for conducting a corresponding touch operation in accordance with a recognition result,
wherein the voltage detection circuit further comprises:
a grayscale value calculation circuit connected to the touch display panel, and the grayscale value calculation circuit is configured for calculating an average grayscale value of the pixel electrodes within the areas corresponding to different touch scanning partitions,
wherein the grayscale value calculation circuit calculates the grayscale values of the pixel electrodes within the areas corresponding to different touch scanning partitions, extracts characteristic grayscale values for calculating the average grayscale value from the grayscale values of the pixel electrodes; and calculates the average grayscale value of the pixel electrodes of the areas in accordance with the characteristic grayscale value;
wherein the characteristic grayscale value only comprises a maximum grayscale value, a minimum grayscale value, and a middle grayscale value; and
wherein only the sum of the maximum grayscale value, the minimum grayscale value, and the middle grayscale value and the quotient of the three pixel electrodes corresponding to those characteristic grayscale values are adopted as the average grayscale value.

2. The touch display as claimed in claim 1 , wherein the voltage detection circuit further comprises:
a voltage feedback circuit connected to the grayscale value calculation circuit, and the voltage feedback circuit is configured for converting the average grayscale value into the corresponding voltage potential.

3. The touch display as claimed in claim 2 , wherein the grayscale value calculation circuit is configured within the display driving circuit, and the voltage feedback circuit and the compensation noise-deduction circuit are configured within the touch driving circuit of the touch display.

4. A driving method of touch display panels, comprising:
detecting a voltage potential of at least one pixel electrode within the areas of the touch display panel corresponding to different touch scanning partitions; and
negating the voltage potential, overlapping the negated voltage potential and feed-backed touch pulse signals, and adopting overlapped signals to be the detected touch pulse signals,
wherein the step of detecting a voltage potential of at least one pixel electrode within the areas of the touch display panel corresponding to different touch scanning partitions further comprises:
calculating an average grayscale value of the pixel electrodes within the areas corresponding to different touch scanning partitions,
wherein the step of calculating an average grayscale value of the pixel electrodes within the areas corresponding to different touch scanning partitions further comprises:
detecting the grayscale values of the pixel electrodes within the areas corresponding to different touch scanning partitions of the touch display panel;
extracting a characteristic grayscale value from the grayscale value of the pixel electrodes;
calculating an average grayscale value of the pixel electrode within the areas in accordance with the characteristic grayscale value;
the characteristic grayscale value only comprising a maximum grayscale value, a minimum grayscale value, and a middle grayscale value;
wherein only the sum of the maximum grayscale value, the minimum grayscale value, and the middle grayscale value and the quotient of the three pixel electrodes corresponding to those characteristic grayscale values are adopted as the average grayscale value; and
recognizing the touch pulse signals and conducting a corresponding touch operation in accordance with a recognition result.

5. The driving method as claimed in claim 4 , wherein the step of detecting a voltage potential of at least one pixel electrode within the areas of the touch display panel corresponding to different touch scanning partitions further comprises:
converting the average grayscale value into a corresponding voltage potential.

6. The driving method as claimed in claim 4 , wherein the step of overlapping the negated voltage potential and feed-backed touch pulse signals further comprises:
adopting the negated voltage potential and the feed-backed touch pulse signals to conduct operations.

7. The driving method as claimed in claim 4 , wherein the step of adopting overlapped signals to be the detected touch pulse signals further comprises:
recognizing the touch pulse signals and conducting a corresponding touch operation in accordance with a recognition result.

8. A driving device of touch display panels, comprising:
a voltage detection circuit connecting to a touch display panel, and the voltage detection circuit being configured for detecting at least one voltage potential of pixel electrodes within areas of the touch display panel, and the areas corresponding to different touch scanning partitions;
a compensation noise-deduction circuit connecting to the voltage detection circuit, and the compensation noise-deduction circuit being configured for negating the voltage potential detected by the voltage detection circuit, overlapping the negated voltage potential and feed-backed touch pulse signals, and adopting overlapped signals as the detected touch pulse signals,
wherein the voltage detection circuit comprises:
a grayscale value calculation circuit connected to the touch display panel, and the grayscale value calculation circuit is configured for calculating an average grayscale value of the pixel electrodes within the areas corresponding to different touch scanning partitions,
wherein the grayscale value calculation circuit calculates the grayscale values of the pixel electrodes within the areas corresponding to different touch scanning partitions, extracts characteristic grayscale values for calculating the average grayscale value from the grayscale values of the pixel electrodes; and calculates the average grayscale value of the pixel electrodes of the areas in accordance with the characteristic grayscale value;
wherein the characteristic grayscale value only comprises a maximum grayscale value, a minimum grayscale value, and a middle grayscale value; and
wherein only the sum of the maximum grayscale value, the minimum grayscale value, and the middle grayscale value and the quotient of the three pixel electrodes corresponding to those characteristic grayscale values are adopted as the average grayscale value.

9. The driving device as claimed in claim 8 , wherein the voltage detection circuit comprises:
a voltage feedback circuit connected to the grayscale value calculation circuit, and the voltage feedback circuit is configured for converting the

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Guo Xingling
• Qin Jiehui
• Huang Chun-Hung

Classifications

• G09G2310/067

  Special waveforms for scanning, where no circuit details of the gate driver are given · CPC title

• G09G3/20 Primary

  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

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/044

  by capacitive means · CPC title