Flat lighting device and display device using light-emitting diode

Patent metadata

Field	Value
Publication number	US-12033565-B2
Application number	US-202018028257-A
Country	US
Kind code	B2
Filing date	Sep 25, 2020
Priority date	Sep 25, 2020
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

The present invention is applicable to a display device-related technical field, and relates to, for example, a flat lighting device and a display device using a light-emitting diode (LED). The present invention relates to a display device including a plurality of individual unit compartment regions, comprising: at least one light-emitting diode provided in the individual unit compartment regions; a gate-on voltage line connected to the light-emitting diode; a scan line for applying a common voltage to the plurality of individual unit compartment regions; a data line for applying individual switching voltages to the plurality of individual unit compartment regions; a driving unit including a driving MOSFET device connected to the light-emitting diode; and a switching unit including a switching MOSFET device connected to the scan line and the data line to perform a switching operation.

First claim

What is claimed is:

1. A display device including multiple individual unit compartment areas, the display device comprising:
at least one light emitting device disposed in an individual unit compartment area;
a gate-on voltage line connected to the at least one light emitting device;
a scan line for applying a common voltage to the multiple individual unit compartment areas;
a data line for applying individual switching voltages to the multiple individual unit compartment areas;
a driver including a driving MOSFET connected to the at least one light emitting device; and
a switching unit including a switching MOSFET connected to the scan line and the data line to perform a switching operation,
wherein a parasitic capacitance between a gate and a drain of the switching MOSFET is smaller than a parasitic capacitance between a gate and a source of the driving MOSFET.

2. The display device of claim 1 , wherein the switching unit includes:
the switching MOSFET being a first switching MOSFET; and
a second switching MOSFET connected in parallel with the first switching MOSFET with respect to the scan line.

3. The display device of claim 2 , wherein the first switching MOSFET and the second switching MOSFET are connected in a reverse direction.

4. The display device of claim 3 , wherein the first switching MOSFET and the second switching MOSFET are connected so that source terminals thereof face each other.

5. The display device of claim 1 , wherein the at least one light emitting device is driven in units of the multiple individual unit compartment areas.

6. The display device of claim 1 , wherein at least one of the driving MOSFET or the switching MOSFET is mounted on a wiring layer formed on a substrate.

7. The display device of claim 6 , wherein the substrate includes a glass substrate.

8. The display device of claim 1 , wherein the driver does not have a separate capacitor.

9. A planar lighting device using at least one light emitting device for driving the at least one light emitting device in units of multiple individual unit compartment areas, the planar lighting device comprising:
the at least one light emitting device disposed in an individual unit compartment area;
a gate-on voltage line connected to the at least one light emitting device;
a scan line for applying a common voltage to the multiple individual unit compartment areas;
a data line for applying individual switching voltages to the multiple individual unit compartment areas;
a driver including a driving MOSFET connected to the at least one light emitting device;
a switching unit including a switching MOSFET connected to the scan line and the data line to perform a switching operation; and
an optical sheet located on the at least one light emitting device,
wherein a parasitic capacitance between a gate and a drain of the switching MOSFET is smaller than a parasitic capacitance between a gate and a source of the driving MOSFET.

10. The lighting device of claim 9 , wherein the individual unit compartment area corresponds to a unit of local dimming.

11. The lighting device of claim 9 , wherein the at least one light emitting device disposed in the individual unit compartment area emits light of a single color.

12. The lighting device of claim 9 , wherein the switching unit includes:
the switching MOSFET being a first switching MOSFET; and
a second switching MOSFET connected in parallel with the first switching MOSFET with respect to the scan line.

13. The lighting device of claim 12 , wherein the first switching MOSFET and the second switching MOSFET are connected in a reverse direction.

14. The lighting device of claim 13 , wherein the first switching MOSFET and the second switching MOSFET are connected to each other so that source terminals thereof face each other.

15. The lighting device of claim 9 , wherein the at least one light emitting device is driven in the units of the multiple individual unit compartment areas.

16. The lighting device of claim 9 , wherein at least one of the driving MOSFET or the switching MOSFET is mounted on a wiring layer formed on a substrate.

17. The lighting device of claim 16 , wherein the substrate includes a glass substrate.

18. The lighting device of claim 9 , wherein the driver does not have a separate capacitor.

19. A display device including multiple individual unit compartment areas, the display device comprising:
at least one light emitting device disposed in an individual unit compartment area;
a gate-on voltage line connected to the at least one light emitting device;
a scan line for applying a common voltage to the multiple individual unit compartment areas;
a data line for applying individual switching voltages to the multiple individual unit compartment areas;
a driver including a driving MOSFET connected to the at least one light emitting device; and
a switching unit including a switching MOSFET connected to the scan line and the data line to perform a switching operation,
wherein the switching unit includes:
the switching MOSFET being a first switching MOSFET; and
a second switching MOSFET connected in parallel with the first switching MOSFET with respect to the scan line,

wherein the first switching MOSFET and the second switching MOSFET are connected in a reverse direction, and
wherein the first switching MOSFET and the second switching MOSFET are connected so that source terminals thereof face each other.

20. A planar lighting device using at least one light emitting device for driving the at least one light emitting device in units of multiple individual unit compartment areas, the planar lighting device comprising:
the at least one light emitting device disposed in an individual unit compartment area;
a gate-on voltage line connected to the at least one light emitting device;
a scan line for applying a common voltage to the multiple individual unit compartment areas;
a data line for applying individual switching voltages to the multiple individual unit compartment areas;
a driver including a driving MOSFET connected to the at least one light emitting device;
a switching unit including a switching MOSFET connected to the scan line and the data line to perform a switching operation; and
an optical sheet located on the at least one light emitting device,
wherein the switching unit includes:
the switching MOSFET being a first switching MOSFET; and
a second switching MOSFET connected in parallel with the first switching MOSFET with respect to the scan line,

wherein the first switching MOSFET and the second switching MOSFET are connected in a reverse direction, and
wherein the first switching MOSFET and the second switching MOSFET are connected to each other so that source terminals thereof face each other.

Assignees

• Lg Electronics Inc

Inventors

• Choi Wonseok
• Park Sungmin
• Kim Soohyun

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/00

  Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED] · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2310/0278

  Details of driving circuits arranged to drive both scan and data electrodes · CPC title