Display apparatus and method of driving the same

Patent metadata

Field	Value
Publication number	US-10825382-B2
Application number	US-201916696368-A
Country	US
Kind code	B2
Filing date	Nov 26, 2019
Priority date	Dec 31, 2018
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A display apparatus includes a display panel and a power voltage generator. The display panel includes pixel circuits including a first light emitting element and a second light emitting element. The power voltage generator applies a high power voltage to first electrodes of the first light emitting element and the second light emitting element, a first low power voltage to a second electrode of the first light emitting element and a second low power voltage to a second electrode of the second light emitting element. The high power voltage has high level, the first low power voltage has low level and the second low power voltage has high level during an emission duration of a first frame. The high power voltage has the high level, the first low power voltage has high level and the second low power voltage has low level during an emission duration of a second frame.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel comprising a plurality of pixel circuits, a pixel circuit from among the pixel circuits comprising a first light emitting element and a second light emitting element; and
a power voltage generator configured to:
apply a high power voltage to a first electrode of the first light emitting element and a first electrode of the second light emitting element;
apply a first low power voltage to a second electrode of the first light emitting element; and
apply a second low power voltage to a second electrode of the second light emitting element,

wherein the high power voltage has a high level, the first low power voltage has a low level and the second low power voltage has a high level during an emission duration of a first frame,
wherein the high power voltage has the high level, the first low power voltage has a high level and the second low power voltage has a low level during an emission duration of a second frame, and
wherein a waveform of the high power voltage in the emission duration of the first frame is different from a waveform of the high power voltage in the emission duration of the second frame.

2. The display apparatus of claim 1 , wherein the high level of the high power voltage is maintained during the emission duration of the first frame, and
wherein the high power voltage has an overdrive level greater than the high level in an initial period of the emission duration of the second frame.

3. The display apparatus of claim 2 , wherein the first light emitting element is configured to emit light during the emission duration of the first frame,
wherein the first light emitting element is a red light emitting element or a blue light emitting element,
wherein the second light emitting element is configured to emit light during the emission duration of the second frame, and
wherein the second light emitting element is a green light emitting element.

4. The display apparatus of claim 2 , wherein the waveform of the high power voltage in the initial period of the emission duration of the second frame has a plurality of pulses having the overdrive level.

5. The display apparatus of claim 1 , wherein the high power voltage has a first overdrive level greater than the high level in an initial period of the emission duration of the first frame, and
wherein the high power voltage has a second overdrive level greater than the first overdrive level in an initial period of the emission duration of the second frame.

6. The display apparatus of claim 5 , wherein the first light emitting element is configured to emit light during the emission duration of the first frame,
wherein the first light emitting element is a red light emitting element or a blue light emitting element,
wherein the second light emitting element is configured to emit light during the emission duration of the second frame, and
wherein the second light emitting element is a green light emitting element.

7. The display apparatus of claim 5 , wherein the waveform of the high power voltage in the initial period of the emission duration of the first frame has a plurality of pulses having the first overdrive level, and
wherein the waveform of the high power voltage in the initial period of the emission duration of the second frame has a plurality of pulses having the second overdrive level.

8. The display apparatus of claim 1 , wherein the pixel circuit further comprises:
a first switching element comprising a control electrode electrically connected to a first node, an input electrode configured to receive the high power voltage and an output electrode electrically connected to the first electrode of the first light emitting element;
a second switching element comprising a control electrode configured to receive a gate compensating signal, an input electrode electrically connected to an output electrode of a third switching element and an output electrode electrically connected to the first electrode of the first light emitting element; and
the third switching element comprising a control electrode configured to receive a gate writing signal, an input electrode electrically connected to the first node and an output electrode electrically connected to the input electrode of the second switching element.

9. The display apparatus of claim 8 , wherein the pixel circuit further comprises:
a first capacitor comprising a first electrode configured to receive an initialization voltage and a second electrode electrically connected to the first node; and
a second capacitor comprising a first electrode electrically connected to the output electrode of the third switching element and a second electrode electrically connected to a data line.

10. The display apparatus of claim 1 , wherein the display panel comprises:
a first subpixel row comprising a first subpixel which is a red subpixel, a second subpixel which is a green subpixel, a third subpixel which is a blue subpixel and a fourth subpixel which is a green subpixel; and
a second subpixel row comprising a fifth subpixel which is a blue subpixel, a sixth subpixel which is a green subpixel, a seventh subpixel which is a red subpixel and an eighth subpixel which is a green subpixel.

11. The display apparatus of claim 10 , wherein the display panel further comprises:
a first data line electrically connected to the first subpixel, the second subpixel, the fifth subpixel, and the sixth subpixel, and
a second data line electrically connected to the third subpixel, the fourth subpixel, the seventh subpixel, and the eighth subpixel.

12. The display apparatus of claim 1 , wherein the high power voltage has a low level, the first low power voltage has the high level and the second low power voltage has the high level during a programming duration of the first frame which precedes the emission duration of the first frame.

13. The display apparatus of claim 12 , wherein the high power voltage has the low level, the first low power voltage has the high level, and the second low power voltage has the high level during an on bias duration of the second frame which is subsequent to the emission duration of the first frame.

14. A display apparatus comprising:
a display panel comprising a plurality of pixel circuits, the pixel circuit comprising a first light emitting element and a second light emitting element; and
a power voltage generator configured to:
apply a high power voltage to a first electrode of the first light emitting element and a first electrode of the second light emitting element;
apply a first low power voltage to a second electrode of the first light emitting element; and
apply a second low power voltage to a second electrode of the second light emitting element,

wherein the high power voltage has a high level, the first low power voltage has a low level and the second low power voltage has a high level during an emission duration of a first frame,
wherein the high power voltage has the high level, the first low power voltage has a high level and the second low power voltage has a low level during an emission duration of a second frame, and
wherein a waveform of the first low power voltage in the emission duration of the first frame is different from a waveform of the second low power voltage in the emission duration of the second frame.

15. The display apparatus of claim 14 , wherein a width of a second low duration when the second low power voltage has the low level in the emission duration of the second frame is less than a width of a first low duration when the first low power voltage has the lo

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Hong Soo
• Gu Bon-Seog
• Bae Woomi

Classifications

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/0214

  with crosstalk due to leakage current of pixel switch in active matrix panels · CPC title

• G09G2230/00

  Details of flat display driving waveforms · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title