Active matrix-based electronic apparatus including a light emitting device that may be non-foward biased to sense light, and method of driving the same

Patent metadata

Field	Value
Publication number	US-11081055-B2
Application number	US-202016801449-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Jul 19, 2019
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

Disclosed are an active matrix-based electronic apparatus and a method of driving the same. More particularly, a pixel circuit of an electronic apparatus according to an embodiment of the present disclosure may include a light-emitting driver configured to apply a forward bias to a light-emitting device in an emission mode to control light to be emitted through the light-emitting device; a sensing driver configured to apply a non-forward bias to the light-emitting device in a sensing mode to control an electrical signal corresponding to light incident on the light-emitting device to be generated; and a reader configured to read intensity of light corresponding to the generated electrical signal.

First claim

What is claimed is:

1. A pixel circuit of an electronic apparatus, the pixel circuit comprising:
a light-emitting driver configured to apply a forward bias to a light-emitting device in an emission mode to control light to be emitted through the light-emitting device;
a sensing driver configured to apply a non-forward bias to the light-emitting device in a sensing mode to control an electrical signal corresponding to light incident on the light-emitting device to be generated; and
a reader configured to read intensity of light corresponding to the generated electrical signal,
wherein the reader comprises a source follower transistor, a fifth transistor, connected to a cathode of the light-emitting device through a gate terminal, and a sixth transistor provided between the fifth transistor and a read line.

2. The pixel circuit according to claim 1 , wherein the light-emitting driver comprises a first transistor provided between a data line and a power source voltage line; and a second transistor connected to a drain terminal of the first transistor through a gate terminal and provided between the power source voltage line and an anode of the light-emitting device.

3. The pixel circuit according to claim 2 , wherein the light-emitting driver further comprises a capacitor provided between the drain terminal of the first transistor and the power source voltage line.

4. The pixel circuit according to claim 2 , wherein the sensing driver comprises a third transistor provided between a cathode of the light-emitting device and a ground voltage line; a fourth transistor provided between the ground voltage line and an anode of the light-emitting device; and a seventh transistor provided between the power source voltage line and the cathode of the light-emitting device.

5. The pixel circuit according to claim 2 , wherein the sensing driver comprises a third transistor provided between a cathode of the light-emitting device and a first ground voltage line; and a fourth transistor provided between an anode of the light-emitting device and a second ground voltage line.

6. The pixel circuit according to claim 5 , wherein the first ground voltage line is applied with a first ground voltage that has a higher level than that of a second ground voltage applied through the second ground voltage line.

7. The pixel circuit according to claim 1 , wherein the sensing driver applies the non-forward bias to the light-emitting device to control the electrical signal corresponding to light emitted from an adjacent pixel to be generated.

8. A pixel circuit of an electronic apparatus, the pixel circuit comprising:
a light-emitting driver configured to apply a forward bias to a light-emitting device in an emission mode to control light to be emitted through the light-emitting device;
a sensing driver configured to apply a non-forward bias to the light-emitting device in a sensing mode to control an electrical signal corresponding to light incident on the light-emitting device to be generated; and
a reader configured to read intensity of light corresponding to the generated electrical signal,
wherein the light-emitting driver comprises a first transistor provided between a data line and a ground voltage line; and a second transistor connected to a source terminal of the first transistor through a gate terminal and provided between a cathode of the light-emitting device, which is connected to a power source voltage line through an anode, and the ground voltage line,
wherein the sensing driver comprises a third transistor provided between the cathode of the light-emitting device and the ground voltage line.

9. The pixel circuit according to claim 8 , wherein the light-emitting driver further comprises a capacitor provided between the source terminal of the first transistor and the ground voltage line.

10. The pixel circuit according to claim 8 , wherein the ground voltage line is applied with a second power source voltage that has a higher level than that of a first power source voltage applied to the power source voltage line, for a preset time section in the sensing mode.

11. A method of driving a pixel circuit of an electronic apparatus, the method comprising:
applying, by a light-emitting driver, a forward bias to a light-emitting device in an emission mode to control light to be emitted through the light-emitting device;
applying, by a sensing driver, a non-forward bias to the light-emitting device in a sensing mode to control an electrical signal corresponding to light incident on the light-emitting device to be generated; and
reading, by a reader, intensity of light corresponding to the generated electrical signal,
wherein the reader comprises a source follower transistor, a fifth transistor, connected to a cathode of the light-emitting device through a gate terminal, and a sixth transistor provided between the fifth transistor and a read line.

12. The method according to claim 11 , in the applying of the non-forward bias, the non-forward bias is applied to the light-emitting device to control the electrical signal, which corresponds to light emitted from an adjacent pixel, to be generated.

Assignees

• Univ Industry Cooperation Group Kyung Hee Univ

Inventors

• Lee Seung-Woo
• Kim Jongbin
• Lee Woo Rim

Classifications

• G09G2360/144

  the light being ambient light · CPC title

• G09G2300/0439

  Pixel structures · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G3/30 Primary

  using electroluminescent panels · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title