Touchscreen device with integrated fingerprint sensor

Patent metadata

Field	Value
Publication number	US-10613677-B2
Application number	US-201715789852-A
Country	US
Kind code	B2
Filing date	Oct 20, 2017
Priority date	Oct 25, 2016
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

The present disclosure provides a touchscreen device with an integrated fingerprint sensor. The touchscreen device including a touchscreen having a touch area for touch sensing and a fingerprint and touch area for touch sensing and fingerprint sensing, the touch area having Tx electrodes arranged in a first direction and Rx electrodes arranged in a second direction, and the fingerprint and touch area having FTx electrodes arranged in the first direction and FRx electrodes arranged in the second direction, and a touch IC that performs touch sensing through the touch area and the fingerprint and touch area and performs fingerprint sensing through the fingerprint and touch area, wherein the Rx electrodes form a plurality of groups, and the groups are individually and separately connected to Rx lines in the boundary region between the touch area and the fingerprint and touch area.

First claim

What is claimed is:

1. A touchscreen device with an integrated fingerprint sensor, the touchscreen device comprising:
a touchscreen having a touch area for touch sensing and a fingerprint and touch area for touch sensing and fingerprint sensing, the touch area having driving electrodes arranged in a first direction and sensing electrodes arranged in a second direction, and the fingerprint and touch area having fingerprint driving electrodes arranged in the first direction and fingerprint sensing electrodes arranged in the second direction, wherein a distance between two neighboring fingerprint sensing electrodes in the fingerprint and touch area have a smaller distance than a distance between two neighboring sensing electrodes in the touch area;
a touch integrated circuit that performs touch sensing through the touch area and the fingerprint and touch area and performs fingerprint sensing through the fingerprint and touch area; and
sensing lines connecting the sensing electrodes to the touch integrated circuit that overlap the fingerprint sensing electrodes arranged in the fingerprint and touch area, wherein at least one of the sensing lines that overlap the fingerprint and touch area do not perform touch sensing or fingerprint sensing for the fingerprint and touch area, the sensing lines including a first sensing line and a second sensing line, the first sensing line and the second sensing line being individual and separate from each other,
wherein the sensing electrodes form a plurality of sensing electrode groups, and the sensing electrode groups are individually and separately connected to the respective sensing lines at the boundary region between the touch area and the fingerprint and touch area,
wherein the sensing electrode groups include a first sensing electrode group and a second sensing electrode group, and the first and the second sensing electrode group includes at least two sensing electrodes electrically connected to each other respectively,
wherein the first sensing line is electrically connected to one of the at least two sensing electrodes of the first sensing electrode group and the second sensing line is electrically connected to one of the at least two sensing electrodes of the second sensing electrode group.

2. The touchscreen device of claim 1 , wherein the fingerprint driving electrodes and the fingerprint sensing electrodes work in groups when performing touch sensing and work individually when performing fingerprint sensing.

3. The touchscreen device of claim 2 , wherein the fingerprint driving electrodes and the fingerprint sensing electrodes form groups by electrical shorting.

4. The touchscreen device of claim 1 , wherein the fingerprint sensing electrodes work in groups or individually in response to an operation of a switch block included within the touch integrated circuit.

5. The touchscreen device of claim 4 , wherein the switch block comprises:
first switches that are turned on in response to a fingerprint enable signal and connect the fingerprint sensing electrodes to input terminals of fingerprint sensing parts; and
second switches that are turned on in response to a touch enable signal and connects the sensing electrodes to input terminals of touch sensing parts.

6. The touchscreen device of claim 5 , wherein the first switches and the second switches perform switching operations inversely to each other in response to the touch enable signal and the fingerprint enable signal.

7. The touchscreen device of claim 1 , wherein the sensing electrode groups always work in groups by the sensing lines arranged on the touchscreen, and the driving electrodes work in groups only when performing touch sensing.

8. The touchscreen device of claim 1 , wherein, when performing fingerprint sensing, the touch integrated circuit connects a plurality of channels connected to the sensing electrode groups to a ground voltage source.

9. The touchscreen device of claim 1 , wherein, when performing touch sensing, the touch integrated circuit defines some of the sensing electrode groups as effective channels and some of the remaining sensing electrode groups as ineffective channels, and connects the ineffective channels to the ground voltage source.

10. The touchscreen device of claim 1 , wherein, when performing touch sensing, the touch integrated circuit defines some of the sensing electrode groups as effective channels and some of the remaining sensing electrode groups as ineffective channels, and brings the ineffective channels into an electrically floating state.

11. The touchscreen device of claim 1 , wherein the touch integrated circuit supplies sensor driving signals of the same phase to the driving electrodes when performing touch sensing, and supplies sensor driving signals of sequentially delayed phases to the fingerprint driving electrodes.

12. The touchscreen device of claim 1 , wherein the touchscreen is implemented as mutual capacitance type, based on electrodes included within a display panel.

13. A touchscreen device with an integrated fingerprint sensor, the touchscreen device comprising:
a touchscreen having a touch area for touch sensing and a fingerprint and touch area for touch sensing and fingerprint sensing, the touch area having driving electrodes arranged in a first direction and sensing electrodes arranged in a second direction, and the fingerprint and touch area having fingerprint driving electrodes arranged in the first direction and fingerprint sensing electrodes arranged in the second direction, wherein a distance between two neighboring fingerprint sensing electrodes in the fingerprint and touch area have a smaller distance than a distance between two neighboring sensing electrodes in the touch area;
a touch integrated circuit that performs touch sensing through the touch area and the fingerprint and touch area and performs fingerprint sensing through the fingerprint and touch area; and
sensing lines connecting the sensing electrodes to the touch integrated circuit passes across the fingerprint sensing electrodes arranged in the fingerprint and touch area, the sensing lines including a first sensing line and a second sensing line, the first sensing line and the second sensing line being individual and separate from each other,
wherein the sensing electrodes form a plurality of sensing electrode groups, and the sensing electrode groups are individually and separately connected to the respective sensing lines at the boundary region between the touch area and the fingerprint and touch area,
wherein the sensing electrode groups include a first sensing electrode group and a second sensing electrode group, and the first and the second sensing electrode group includes at least two sensing electrodes electrically connected to each other respectively,
wherein the first sensing line is electrically connected to one of the at least two sensing electrodes of the first sensing electrode group and the second sensing line is electrically connected to one of the at least two sensing electrodes of the second sensing electrode group,
wherein the sensing electrode groups always simultaneously perform sensing in groups by the sensing lines arranged on the touchscreen, and the driving electrodes simultaneously perform driving in groups only when performing touch sensing.

14. The touchscreen device of claim 13 , wherein the fingerprint driving electrodes and the fingerprint sensing electrodes work in groups when performing touch sensing and work individually when performing fingerprint sensing.

15. The touchscreen device of claim 13 , wherein the fingerprint sensing electrodes work in groups o

Assignees

• Lg Display Co Ltd

Inventors

• Cho Jiho
• Choo Kyoseop
• Han Manhyeop

Classifications

• 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

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06K9/0002

  Physics · mapped topic

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title