Display device and an operating method thereof

Patent metadata

Field	Value
Publication number	US-12008201-B2
Application number	US-202117328038-A
Country	US
Kind code	B2
Filing date	May 24, 2021
Priority date	Aug 28, 2020
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A display device including: a display panel; a first input sensor disposed on the display panel and configured to generate a first reception signal in response to a user input; a second input sensor spaced apart from the first input sensor on the display panel and configured to generate a second reception signal in response to the user input; and a readout circuit configured to generate an output signal corresponding to the user input in response to the first reception signal and the second reception signal.

First claim

What is claimed is:

1. A display device, comprising:
a display panel;
a first input sensor disposed on a first side of the display panel and configured to generate a first reception signal in response to a user input;
a second input sensor spaced apart from the first input sensor on the first side of the display panel and configured to generate a second reception signal in response to the user input;
a first adhesive member disposed between the first side of the display panel and the first input sensor;
a second adhesive member disposed between the first side of the display panel and the second input sensor;
a readout circuit configured to generate an output signal corresponding to the user input in response to the first reception signal and the second reception signal; and
a window overlapping the display panel,
wherein the readout circuit comprises:
an analog to digital converter configured to convert the first reception signal received from the first input sensor and the second reception signal received from the second input sensor into a first digital reception signal and a second digital reception signal, respectively;
a force calculation unit configured to convert the first digital reception signal and the second digital reception signal into a force signal based on one of a sum and an average of the first digital reception signal and the second digital reception signal;
a lookup table for storing a grip force signal corresponding to the force signal; and
a grip force calculation unit configured to convert the force signal into the grip force signal based on the lookup table,
wherein a correlation between one of a sum and an average of the first digital reception signal and the second digital reception signal and the force signal is determined depending on a material of the window,
wherein the display device further comprises:
an input sensing layer disposed on a second side of the display panel; and
an anti-reflective layer disposed on the input sensing layer, wherein an empty space exists where the anti-reflective layer overlaps the first input sensor or the second input sensor since the input sensing layer is not in an area of the first and second input sensors,
wherein an edge of the input sensing layer, an edge of the first input sensor and an edge of the first adhesive member contact a line that extends through the display panel and is perpendicular to top and bottom surfaces of the display panel.

2. The display device of claim 1 , wherein each of the first input sensor and the second input sensor is a pressure sensor.

3. The display device of claim 1 , wherein the first input sensor overlaps a first edge of the display panel,
wherein the second input sensor overlaps a second edge of the display panel.

4. The display device of claim 1 , wherein the first input sensor comprises:
first input sensing cells;
a first transmission line configured to transmit a transmission signal to the first input sensing cells; and
first reception lines respectively connected to the first input sensing cells, each of the first reception lines configured to transmit a reception signal from the first input sensing cell to which it is connected,
wherein the first transmission line and the first reception lines are electrically connected to the readout circuit.

5. The display device of claim 4 , wherein each of the first input sensing cells comprises:
a first electrode disposed on a substrate;
a second electrode disposed on the substrate and spaced apart from the first electrode; and
a pressure sensing layer directly disposed on the first electrode and the second electrode.

6. The display device of claim 4 , wherein the first input sensor and the second input sensor are spaced apart from each other in a first direction,
wherein each of the first input sensing cells is arranged in a second direction crossing the first direction.

7. The display device of claim 1 , wherein the second input sensor comprises:
second input sensing cells;
a second transmission line configured to transmit a transmission signal to the second input sensing cells; and
second reception lines respectively connected to the second input sensing cells, each of the second reception lines configured to transmit a reception signal from the second input sensing cell to which it is connected,
wherein the second transmission line and the second reception lines are electrically connected to the readout circuit.

8. The display device of claim 1 , wherein the readout circuit detects a user's touch area based on the first reception signal from the first input sensor and the second reception signal from the second input sensor, and outputs the grip force signal corresponding to a user's grip force input when the touch area is greater than or equal to a preset area.

9. The display device of claim 1 , wherein each of the first input sensor and the second input sensor is a resistance change type pressure sensor.

10. The display device of claim 9 , wherein resistance of each of the first input sensor and the second input sensor decreases as external pressure increases.

11. The display device of claim 1 , wherein the first input sensor and the second input sensor are disposed on a rear surface of the display panel.

12. The display device of claim 1 , wherein the input sensing layer includes a first sensing area, a second sensing area and a third sensing area,
wherein the display panel comprises a display area overlapping the third sensing area, a first edge display area adjacent to a first side of the display area and overlapping the first sensing area, and a second edge display area adjacent to a second side of the display area and overlapping the second sensing area.

13. The display device of claim 12 , wherein the first input sensor corresponds to the first sensing area of the input sensing layer,
wherein the second input sensor corresponds to the second sensing area of the input sensing layer.

14. A display device, comprising:
a display panel;
a first input sensor arranged at a first side of the display panel;
a second input sensor arranged at the first side of the display panel;
a first adhesive member disposed between the first side of the display panel and the first input sensor;
a second adhesive member disposed between the first side of the display panel and the second input sensor;
a readout circuit configured to detect a user's grip force in response to a first signal from the first input sensor and a second signal from the second input sensor,
wherein the first input sensor includes a plurality of first pressure sensor cells and the second input sensor includes a plurality of second pressure sensor cells,
wherein each of the first and second pressure sensor cells comprises:
a first electrode disposed on a substrate;
a second electrode disposed on the substrate and spaced apart from the first electrode; and
a pressure sensing layer directly disposed on the first electrode and the second electrode,
wherein the first electrode and the second electrode each have a comb shape,
wherein the display device further comprises:
an input sensing layer disposed on a second side of the display panel; and
an anti-reflective layer disposed on the input sensing layer, wherein an empty space exists where the anti-reflective layer overlaps the first input sensor or the second input sensor since the input sensing layer is not in an area of the first and second input sensors,
wherein an edge of the input sensing layer, an edge of the first input sensor and an edge of the first adhesive member contact a line that extends through the disp

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Yuna
• Seomoon Hee
• Lee Soojung
• Chun Seungwook
• Choi Boram

Classifications

• G06F3/0414

  using force sensing means to determine a position · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04105

  Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F1/1637

  Details related to the display arrangement, including those related to the mounting of the display in the housing · CPC title