Organic light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-2016189609-A1
Application number	US-201514791660-A
Country	US
Kind code	A1
Filing date	Jul 6, 2015
Priority date	Dec 29, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

An organic light emitting display apparatus includes first and second pixels on a display region, first and second scan lines connected to the first and second pixels respectively, and a gate driver to output a first scan signal and a second scan signal to the first and second scan lines respectively. The first pixel includes a first pixel circuit and a first organic light emitting diode (OLED). The second pixel includes a second pixel circuit and a second OLED. Each of the first and second pixel circuits includes a driving transistor to output driving current to the anode of a respective one of the first and second OLEDs. The anode of the second OLED at least partially overlaps the gate of a driving transistor of the first pixel circuit.

First claim

What is claimed is:

1 . An organic light emitting display apparatus, comprising:
first and second pixels on a display region; first and second scan lines connected to the first and second pixels respectively; and a gate driver to output a first scan signal and a second scan signal to the first and second scan lines respectively, wherein the first pixel includes a first pixel circuit and a first organic light emitting diode (OLED) and the second pixel includes a second pixel circuit and a second OLED, wherein each of the first and second pixel circuits includes a driving transistor to output driving current to an anode of a respective one of the first and second OLEDs, and wherein the anode of the second OLED at least partially overlaps a gate of a driving transistor of the first pixel circuit.

2 . The apparatus as claimed in claim 1 , further comprising:
a controller to output a horizontal synchronization signal to the gate driver, wherein the gate driver is to output the first and second scan signals in synchronization with the horizontal synchronization signal, and wherein a scanning time of the first scan signal precedes a scanning time of the second scan signal.

3 . The apparatus as claimed in claim 2 , wherein the scanning time of the first scan signal precedes the scanning time of the second scan signal by a cycle of the horizontal synchronization signal.

4 . The apparatus as claimed in claim 1 , further comprising:
a first data line commonly connected to the first and second pixels; and a source driver synchronized with the first and second scan signals and to output a data signal to the first data line.

5 . The apparatus as claimed in claim 4 , wherein each of the first and second pixel circuits includes:
a switching transistor to transfer the data signal based on a respective one of the first or second scan signals; and a storage capacitor to charge a voltage corresponding to the transferred data signal, wherein the driving transistor is to output the driving current corresponding to the voltage charged in the storage capacitor to the anode of a respective one of the first or second OLEDs.

6 . The apparatus as claimed in claim 5 , wherein each of the first and second pixel circuits includes:
a compensation transistor to electrically connect a gate and a drain of the driving transistor based on a respective one of the first or second scan signals; and a gate initialization transistor to transfer an initialization voltage to the gate of the driving transistor based on a respective one of third or fourth scan signals, wherein a scanning time of the third scan signal precedes a scanning time by the first scan signal, and wherein a scanning time by the fourth scan signal precedes a scanning time by the second scan signal.

7 . The apparatus as claimed in claim 6 , further comprising:
a controller to output a horizontal synchronization signal to the gate driver, wherein the gate driver is to output the first and second scan signals in synchronization with the horizontal synchronization signal, wherein the scanning time of the third scan signal precedes a scanning time of the first scan signal by a cycle of the horizontal synchronization signal, and wherein the scanning time of the fourth scan signal precedes the scanning time of the second scan signal by the cycle of the horizontal synchronization signal.

8 . The apparatus as claimed in claim 6 , wherein each of the first and second pixel circuits includes:
an operation control transistor to be controlled by an emission control signal, the operation control transistor disposed between a driving voltage line and a source of the driving transistor; and an emission control transistor to be controlled by the emission control signal, the emission control transistor disposed between a drain of the driving transistor and the anode of a respective one of the first or second OLEDs, wherein the operation control transistor and the emission control transistor are to output a driving current generated by the driving transistor to the anode of the respective one of the first or second OLEDs based on the emission control signal.

9 . The apparatus as claimed in claim 8 , wherein each of the first and second pixel circuits includes:
an anode initialization transistor to transfer the initialization voltage to the anode of the respective one of first or second OLEDs based on a respective one of the first or second scan signals.

10 . The apparatus as claimed in claim 9 , wherein a time when a storage capacitor of the first pixel circuit is completely charged precedes a time when the initialization voltage is transferred to the anode of the second OLED by the anode initialization transistor of the second pixel circuit and an emitting time of the second OLED by an emission control transistor of the second pixel circuit.

11 . The apparatus as claimed in claim 9 , wherein:
a voltage level of a gate of a driving transistor of the first pixel circuit is changed by a first variance according to a change in a voltage level of the anode of the second OLED at a scanning time by the second scan signal, the voltage level of the gate of the driving transistor of the first pixel circuit is changed by a second variance according to the change in the voltage level of the anode of the second OLED at an emitting time by the emission control signal, and the second variance is at least partially compensated by the first variance.

12 . The apparatus as claimed in claim 1 , further comprising:
a third pixel on the display region, wherein the third pixel includes a third pixel circuit and a third OLED, wherein the third pixel circuit includes a driving transistor to output a driving current to an anode of the third OLED, and wherein the anode of the third OLED at least partially overlaps a gate of a driving transistor of the second pixel circuit.

13 . The apparatus as claimed in claim 2 , further comprising:
fourth and fifth pixels adjacent to the display region; fourth and fifth scan lines respectively connected to the fourth and fifth pixels; and a second data line commonly connected to the fourth and fifth pixels, wherein the fourth pixel includes a fourth pixel circuit and a fourth OLEDs, wherein the fifth pixel includes a fifth pixel circuit and a fifth OLED, wherein each of the fourth and fifth pixel circuits includes a driving transistor to output a driving current to an anode of a respective one of the fourth or fifth OLEDs, wherein the anode of the fourth OLED is in a different region from gates of the driving transistors of the fourth and fifth pixel circuits in the display region, and wherein the anode of the fifth OLED is in a different region from gates of the driving transistors of the fourth and fifth pixel circuits in the display region.

14 . An organic light emitting display apparatus, comprising:
first and second pixel regions on a display region; first and second scan lines respectively connected to the first and second pixel regions; and a gate driver to respectively output a first scan signal and a second scan signal to the first and second scan lines, wherein the first pixel region includes a first pixel circuit and a first OLED, wherein the second pixel region includes a second pixel circuit and a second OLED, wherein each of the first and second pixel circuits includes a driving transistor, wherein an anode of the first OLED at least partially overlaps a gate of a driving transistor of the first pixel circuit, wherein an anode of the second OLED at least partially overlaps the gate of the driving transistor of the second pixel circuit,

Assignees

• Samsung Display Co Ltd

Inventors

• Seo Myeonghee
• Choi Junwon
• Woo Minkyu

Classifications

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2320/0219

  Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling · CPC title

• G09G2310/0202

  Addressing of scan or signal lines · CPC title

• G09G2300/0439

  Pixel structures · CPC title