Display apparatus with fingerprint identification function

Patent metadata

Field	Value
Publication number	US-10275632-B2
Application number	US-201615224653-A
Country	US
Kind code	B2
Filing date	Jul 31, 2016
Priority date	Aug 25, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A display apparatus which is also able to receive and identify fingerprints comprises a first substrate, a second substrate, a liquid crystal layer, a plurality of dummy pixel units located in a non-display region, a fingerprint identification module, and a plurality of data extending lines. Each of the dummy units comprises first and second auxiliary electrodes. The fingerprint identification module comprises signal transmitting layer and signal receiving components on the signal transmitting layer. The signal receiving component receives reflected ultrasonic wave and converts the received waves into fingerprint signal. The data extending line is electrically connected with the dummy pixel unit. The signal receiving component transmits the fingerprint signals to the at least one first auxiliary electrode and the data extending line thus receives the fingerprint signal.

First claim

What is claimed is:

1. A display apparatus with a display region and a non-display region surrounding the display region, the display apparatus comprising:
a first substrate;
a second substrate;
a liquid crystal layer sandwiched between the first substrate and the second substrate;
a plurality of data lines;
a plurality of dummy pixel units located in the non-display region, and each of the dummy pixel units comprising:
at least one first auxiliary electrode in the non-display region;
at least one second auxiliary electrode located upon the at least one first auxiliary electrode and in the non-display region;

a fingerprint identification module located in the non-display region, and the fingerprint identification module comprising:
a signal transmitting layer located between the first substrate and the second substrate, and configured to generate ultrasonic wave;
a plurality of signal receiving components located upon the signal transmitting layer and at a side of the liquid crystal layer away from the first substrate, and configured to receive the ultrasonic wave reflected by an object on the non-display region and transfer the received ultrasonic wave into fingerprint signals; and

a plurality of data extending lines extending from the plurality of data lines and disposed between the first substrate and the second substrate, and configured to electrically connect with the corresponding dummy pixel unit;
wherein the signal receiving components further transmit the fingerprint signals to the at least one first auxiliary electrode; the data extending lines receive the fingerprint signals from the at least one first auxiliary electrode; the at least one first auxiliary electrode and the at least one second auxiliary electrode locating at opposite sides of the liquid crystal layer; the at least one first auxiliary electrode, the liquid crystal layer, and the at least one second auxiliary electrode cooperate to form capacitors; each of the at least one first auxiliary electrode is located at a side of one of the plurality of signal receiving components adjacent to the liquid crystal layer.

2. The display apparatus of claim 1 , further comprising a plurality of display pixel units in the display region and a plurality of data lines electrically connected with the display pixel units respectively; wherein each of the display pixel units comprises at least one first electrode and at least one second electrode; the at least one first electrode receives an image data signal from the corresponding data line; the at least one first electrode and the corresponding second electrode cooperate with each other to drive liquid crystals in the liquid crystal layer to rotate; each of the data extending line is electrically connected to the corresponding data line.

3. The display apparatus of claim 2 , wherein the data extending lines transmit the image data signal and the fingerprint signals in turn.

4. The display apparatus of claim 2 , further comprising a scan circuit connected to the display pixel units by a plurality of first scan lines and connected to the dummy pixel units by a plurality of second scan lines respectively, wherein the scan circuit generates a first scan signal to the display pixel units in a display period, and generates a second scan signal to the dummy pixel units in a fingerprint identification period; the second scan signal controls the at least one first auxiliary electrode to receive the fingerprint signal.

5. The display apparatus of claim 4 , wherein each of the display pixel units further comprises a first switch; the first switch turns on based on the first scan signal, and the at least one first electrode receives the image data signal from the data line.

6. The display apparatus of claim 4 , wherein each of the dummy pixel units further comprises a second switch, the second switch turns on based on the second scan signal, and the at least one first auxiliary electrode receives the fingerprint signals from the data extending line.

7. The display apparatus of claim 4 , wherein the at least one second auxiliary electrode receives a voltage for determining a voltage difference between reflected ultrasonic waves in the fingerprint identification period.

8. The display apparatus of claim 1 , wherein the at least one second auxiliary electrode is insulated from the liquid crystal layer.

9. The display apparatus of claim 8 , wherein the at least one first auxiliary electrode is sandwiched between the liquid crystal layer and the corresponding signal receiving component.

10. The display apparatus of claim 1 , wherein the signal receiving components are located upon the at least one second auxiliary electrode and is sandwiched between the at least one second auxiliary electrode and the liquid crystal layer.

Assignees

• Interface Optoelectronic Shenzhen Co Ltd
• General Interface Solution Ltd

Inventors

• Chen Chun-Chi
• Huang Shang-Yu
• Chen Chen-You
• Wang Shih-Yu

Classifications

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G06K9/0002 Primary

  Physics · mapped topic

• G06V40/1306 Primary

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