Identity recognition display device, and array substrate and identity recognition circuit thereof

Patent metadata

Field	Value
Publication number	US-11036977-B2
Application number	US-201715573228-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Aug 15, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

An identity recognition device, and an substrate and an identity recognition circuit are disclosed. In the substrate, a plurality of second recognition output lines are added to be arranged in pairs with first recognition output lines. A control signal loaded to the control signal line will be coupled to the first and second recognition output lines by the parasitic capacitance between the control signal line and the recognition output lines to cause similar signal interference to the first and second recognition output lines. During the identity recognition time period, the signal interference in the electric signal outputted by the first recognition output line can be removed by utilizing the similar noise signal received by the second recognition output line, in such a way to improve the signal-to-noise ratio and detection precision of the identity recognition signal.

First claim

What is claimed is:

1. An identity recognition substrate comprising: a plurality of pixel circuits arranged in array on a base substrate, a plurality of control signal lines connected correspondingly with respective rows of the pixel circuits, a plurality of photosensitive elements arranged in array, a plurality of first recognition output lines connected correspondingly with respective columns of the photosensitive elements, a plurality of second recognition output lines arranged in pairs with respective first recognition output lines, and a detection circuit connected with the first recognition output lines and the second recognition output lines respectively; wherein
a first recognition output line and a second recognition output line arranged in pair extend in the same direction, and an orthographic projection of a control signal line overlapping the respective orthographic projections of the first recognition output line and the second recognition output line arranged in pair, wherein a control signal loaded to the control signal line causes signal interference to the first recognition output line and the second recognition output line arranged in pair;
the second recognition output line is connected at only one end with the detection circuit and arranged in suspension at the other end;
the detection circuit is configured to denoise an electric signal outputted from the first recognition output line according to a noise signal outputted from the second recognition output line during an identity recognition time period, wherein the noise signal results from the signal interference to the second recognition output line caused by the control signal.

2. The identity recognition substrate according to claim 1 , wherein the first recognition output line and the second recognition output line arranged in pair are located in the same gap between the pixel circuits.

3. The identity recognition substrate according to claim 2 , wherein the first recognition output line and the second recognition output line arranged in pair are arranged substantially mutually in parallel.

4. The identity recognition substrate according to claim 1 , wherein the second recognition output line and the first recognition output line are arranged in the same layer and substantially in parallel, and the second recognition output line and the first recognition output line have an equal line width.

5. The identity recognition substrate according to claim 1 , wherein the detection circuit comprises a plurality of detection sub-circuits, each of the detection sub-circuits corresponds in a one-to-one relationship to and is connected with each pair of the first recognition output line and second recognition output line.

6. The identity recognition substrate according to claim 5 , wherein each of the detection sub-circuits comprises:
a differential circuit configured to differentiate electric signals outputted from the first recognition output line and the second recognition output line to obtain a differential signal, thereby denoise an electric signal outputted from the first recognition output line.

7. The identity recognition substrate according to claim 6 , wherein each of the detection sub-circuits further comprises:
a first voltage conversion circuit configured to convert the received current signal outputted from the first recognition output line into a first voltage signal;
a second voltage conversion circuit configured to convert the received current signal outputted from the second recognition output line into a second voltage signal;
a first filter-amplifying circuit connected with an output terminal of the differential circuit and configured to filter-amplify the differential signal;
a demodulation circuit connected with an output terminal of the first filter-amplifying circuit and configured to demodulate the filter-amplified differential signal according to a received fingerprint demodulation carrier wave signal sent by a modulator;
a second filter-amplifying circuit connected with an output terminal of the demodulation circuit and configured to filter-amplify the demodulated differential signal; and
an analog-to-digital conversion circuit connected with an output terminal of the second filter-amplifying circuit and configured to convert the filter-amplified demodulated differential signal from an analog signal into a digital signal,
wherein the differential circuit is connected to the output terminal of the first voltage conversion circuit and the output terminal of the second voltage conversion circuit, and configured to differentiate the first voltage signal and the second voltage signal to obtain the differential signal.

8. The identity recognition substrate according to claim 7 , wherein the fingerprint demodulation carrier wave signal has the same signal frequency as the control signal.

9. The identity recognition substrate according to claim 8 , wherein a particular fixed phase difference exists between the fingerprint demodulation carrier wave signal and the control signal.

10. The identity recognition substrate according to claim 9 , wherein the fixed phase difference is 0 or 180 degrees.

11. The identity recognition substrate according to claim 6 , wherein each of the detection sub-circuits further comprises:
a first voltage conversion circuit configured to convert the received current signal outputted from the first recognition output line into a first voltage signal;
a second voltage conversion circuit configured to convert the received current signal outputted from the second recognition output line into a second voltage signal;
a first filter-amplifying circuit connected with an output terminal of the first voltage conversion circuit and configured to filter-amplify the first voltage signal;
a second filter-amplifying circuit connected with an output terminal of the second voltage conversion circuit and configured to filter-amplify the second voltage signal;
a demodulation circuit connected with an output terminal of the differential circuit and configured to demodulate the differential signal according to a received fingerprint demodulation carrier wave signal sent by a modulator;
a third filter-amplifying circuit connected with an output terminal of the demodulation circuit and configured to filter-amplify the demodulated differential signal; and
an analog-to-digital conversion circuit connected with an output terminal of the third filter-amplifying circuit and configured to convert the filter-amplified demodulated differential signal from an analog signal into a digital signal,
wherein the differential circuit is connected to the output terminal of the first filter-amplifying circuit and the output terminal of the second filter-amplifying circuit, and configured to differentiate the filter-amplified first voltage signal and the filter-amplified second voltage signal to obtain the differential signal.

12. The identity recognition substrate according to claim 6 , wherein each of the detection sub-circuits further comprises:
a first voltage conversion circuit configured to convert the received current signal outputted from the first recognition output line into a first voltage signal;
a second voltage conversion circuit configured to convert the received current signal outputted from the second recognition output line into a second voltage signal;
a first filter-amplifying circuit connected with an output terminal of the first voltage conversion circuit and configured to filter-amplify the first voltage signal;
a second filter-amplifying circuit connected with an output terminal of the second voltage conversion circuit and configured to filter-amplify the second volta

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Pengpeng
• Dong Xue
• Lv Jing
• Wang Haisheng
• Wu Chunwei
• Ding Xiaoliang
• Liu Yingming
• Liu Wei
• Han Yanling
• Cao Xueyou
• Zhang Ping
• Li Changfeng
• Zhao Lijun
• Xu Rui

Classifications

• G06V40/1347

  Preprocessing; Feature extraction · CPC title

• G06V10/30

  Noise filtering · CPC title

• G06F2218/04

  Denoising · CPC title

• G06V40/1318 Primary

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

• H10F39/198

  Contact-type image sensors [CIS] · CPC title