Touch display panel and method for driving touch display panel

Patent metadata

Field	Value
Publication number	US-10761653-B2
Application number	US-201916568899-A
Country	US
Kind code	B2
Filing date	Sep 12, 2019
Priority date	Dec 6, 2018
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A display panel able to receive full fingerprint impressions in a display area together with command touches, in addition to showing images, includes a substrate, scan lines, data lines, touch scan lines, touch lines, sub-pixels, and fingerprint sensing units. A method for driving such multifunctional touch display panel is also provided.

First claim

What is claimed is:

1. A touch display panel comprising:
a substrate;
a plurality of scan lines on the substrate and extending in a first direction;
a plurality of data lines on the substrate and extending in a second direction, the second direction intersecting with the first direction;
a plurality of sub-pixels, each of the plurality of sub-pixels being defined by an area surrounded by any adjacent two of the scan lines and any adjacent two of the data lines insulatively intersecting with the adjacent two scan lines, and each of the plurality of sub-pixels comprising a pixel electrode and a first thin film transistor (TFT) electrically connected to the pixel electrode;
a plurality of touch scan lines on the substrate and extending in the first direction;
a plurality of touch lines on the substrate and extending in the second direction; and
a plurality of sensing units, each of the plurality of sensing units being defined by an area surrounded by any adjacent two of the touch scan lines and any adjacent two of the touch lines insulatively intersecting with the adjacent two touch scan lines, each of the plurality of sensing units comprising a common electrode and a second TFT electrically connected to the common electrode;

wherein:
a gate electrode of the second TFT is electrically connected to one of the plurality of touch scan lines, and a source electrode of the second TFT is electrically connected to one of the plurality of touch lines, and a drain electrode of the second TFT is electrically connected to the common electrode of one of the plurality of sensing units;
each of the plurality of touch lines is configured to load a common voltage signal, a touch driving signal, and a fingerprint sensing signal;
each of the plurality of touch scan lines is configured to turn on and turn off the second TFT in a time division manner so that the common voltage signal, the touch driving signal, or the fingerprint sensing signal from one of the plurality of touch lines is input to the common electrode of one of the plurality of sensing units.

2. The touch display panel according to claim 1 , wherein display frequency of the touch display panel comprises a plurality of driving cycles, each of the plurality of driving cycles comprises a display period, a touch period, and a fingerprint sensing period;
during the display period, the common electrode of each of the plurality of sensing units receives the common voltage signal to display images;
during the touch period, the common electrodes of each of the plurality of sensing units receives the touch driving signal to sense touches; and
during the fingerprint sensing period, the common electrodes of each of the plurality of sensing units receives the fingerprint sensing signal to sense fingerprint.

3. The touch display panel according to claim 2 , wherein each of the plurality of driving cycles comprises an odd frame and an even frame, the odd frame comprises alternating the display period and the touch period, the even frame comprises the fingerprint sensing period.

4. The touch display panel according to claim 2 , wherein during the fingerprint sensing period, all of the plurality of scan lines receive a low level signal, all of the plurality of data lines are grounded, the pixel electrode of each of the plurality of sub-pixels is floated, the plurality of touch scan lines receives a scan signal in sequence, and all of the plurality of touch lines receive the fingerprint sensing signal to achieve fingerprint sensing.

5. The touch display panel according to claim 1 , wherein in each of the plurality of sub-pixels, a gate electrode of the first TFT is electrically connected to one of the plurality of scan lines, and a source electrode of the first TFT is electrically connected to one of the plurality of data lines, a drain electrode of the first TFT is electrically connected to the pixel electrode, and the first TFT is configured to load a display signal to the pixel electrode through one of the plurality of data lines under a control of one of the plurality of scan lines.

6. The touch display panel according to claim 1 , wherein:
the plurality of scan lines and the plurality of touch scan lines are defined by a first metal layer;
the plurality of the touch lines and the plurality of data lines are defined by a second metal layer; and
the first metal layer and the second metal layer are different layers.

7. The touch display panel according to claim 1 , wherein:
the plurality of scan lines and the plurality of the touch scan lines are defined by a first metal layer;
the plurality of data lines is defined by a second metal layer;
the plurality of touch lines is defined by a third metal layer;
the first metal layer, the second metal layer, and the third metal layer are different layers.

8. The touch display panel according to claim 1 , wherein at least three adjacent sub-pixels of the plurality of sub-pixels define one pixel, and a projection of one common electrode on the substrate covers projections of all of the pixel electrodes in at least one pixel on the substrate.

9. The touch display panel according to claim 8 , wherein the common electrode of each of the plurality of sensing units is substantially rectangular, and a maximum side length of the rectangle is less than 100 micrometers.

10. A touch display panel comprising:
a substrate;
a plurality of scan lines on the substrate and extending in a first direction;
a plurality of data lines on the substrate and extending in a second direction, the second direction intersecting with the first direction;
a plurality of sub-pixels, each of the plurality of sub-pixels being defined by an area surrounded by any adjacent two of the scan lines and any adjacent two of the data lines insulatively intersecting with the adjacent two scan lines, and each of the plurality of sub-pixels comprising a pixel electrode and a first thin film transistor (TFT), a gate electrode of the first TFT is electrically connected to one of the plurality of scan lines, and a source electrode of the first TFT is electrically connected to one of the plurality of data lines, a drain electrode of the first TFT is electrically connected to the pixel electrode, and the first TFT is configured to load a display signal to the pixel electrode through one of the plurality of data lines under a control of one of the plurality of scan lines;
a plurality of touch scan lines on the substrate and extending in the first direction;
a plurality of touch lines on the substrate and extending in the second direction;
a plurality of sensing units, each of the plurality of sensing units being defined by an area surrounded by any adjacent two of the touch scan lines and any adjacent two of the touch lines insulatively intersecting with the adjacent two touch scan lines, each of the plurality of sensing units comprising a common electrode and a second TFT electrically connected to the common electrode; and
a driving circuit electrically connected to the plurality of scan lines, the plurality of data lines, the plurality of touch scan lines, and the plurality of touch lines; wherein:
during a display period, the driving circuit applies a common voltage signal to the common electrode of each of the plurality of sensing units, and applies a display signal to the pixel electrode of each of the plurality of sub-pixels to display images;
during a touch period, the driving circuit applies a touch driving signal to the common electrode of each of the plurality of sensing units to sense touches;
during a fingerprint sensing period, the driving circuit applies a fingerprint sensing signal to the common electrode of each of the plurality of sensing units

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Weng Yu-Fu
• Lin Chien-Wen
• Liu Chia-Lin

Classifications

• G06V40/12

  Fingerprints or palmprints · CPC title

• G06V40/1318

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• G06V40/1306

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title