Organic light emitting display panel, driving method thereof and organic light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-10672345-B2
Application number	US-201715593734-A
Country	US
Kind code	B2
Filing date	May 12, 2017
Priority date	Jan 5, 2017
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

The present disclosure discloses an organic light emitting display panel, a driving method thereof, and an organic light emitting display apparatus. The organic light emitting display panel includes a plurality of pixel driving circuits, the pixel driving circuit comprising: a driving module including a driving transistor and a first capacitor; an initialization module for writing signals of a first initialization signal terminal and a second initialization signal terminal respectively to a gate and a first electrode of the driving transistor; a data writing module; a light emitting control module including a first transistor, a gate, a first electrode and a second electrode of the first transistor respectively connecting to a light emitting signal terminal, a second electrode plate of the first capacitor and the gate of the driving transistor; an organic light emitting diode, a cathode of the organic light emitting diode connecting to a second voltage terminal.

First claim

What is claimed is:

1. An organic light emitting display panel, comprising:
a plurality of pixel driving circuits arranged in a matrix of a plurality of rows and a plurality of columns, where the pixel driving circuit comprises a first scanning signal terminal, a second scanning signal terminal, a light emitting signal terminal, a data signal terminal, a first initialization signal terminal, a second initialization signal terminal, a first voltage terminal, a second voltage terminal, a driving module, an initialization module, a data writing module, a light emitting control module and an organic light emitting diode;
wherein the driving module comprises:
a driving transistor and a first capacitor, wherein the first capacitor includes a first electrode plate and a second electrode plate,
wherein the first electrode plate electrically connects to a first electrode of the driving transistor,
wherein a second electrode of the driving transistor electrically connects to the first voltage terminal;
wherein the driving transistor provides a light emitting current to an anode of the organic light emitting diode under the control of the light emitting control module;
wherein the initialization module electrically connects to a gate of the driving transistor and the first electrode of the driving transistor, for writing signals from the first initialization signal terminal and the second initialization signal terminal respectively to both the gate of the driving transistor and the first electrode of the driving transistor, under the control of the first scanning signal terminal and the second scanning signal terminal;
wherein the data writing module electrically connects to the second electrode plate of the first capacitor, for transmitting a signal of the data signal terminal to the second electrode plate of the first capacitor, under the control of the first scanning signal terminal;
wherein the light emitting control module comprises a first transistor, wherein a gate of the first transistor electrically connects to the light emitting signal terminal, a first electrode of the first transistor electrically connects to the second electrode plate of the first capacitor, and a second electrode of the first transistor electrically connects to the gate of the driving transistor;
wherein a cathode of the organic light emitting diode electrically connects to the second voltage terminal; and
wherein in a first phase,
a first level signal is provided to the first scanning signal terminal and the second scanning signal terminal;
a second level signal is provided to the light emitting signal terminal;
a first initialization signal is provided to the first initialization signal terminal;
a second initialization signal is provided to the second initialization signal terminal;
a data signal is provided to the data signal terminal;
wherein the initialization module writes the first initialization signal and the second initialization signal respectively into the gate and the first electrode of the driving transistor, and the data writing module transmits the data signal to the second electrode plate of the first capacitor;
in a second phase, wherein:
the first level signal is provided to the first scanning signal terminal;
the second level signal is provided to the second scanning signal terminal and the light emitting signal terminal;
the first initialization signal is provided to the first initialization signal terminal;
the data signal is provided to the data signal terminal;
the initialization module writes the first initialization signal into the gate of the driving transistor, and the data writing module transmit the data signal to the second electrode plate of the first capacitor;
the driving transistor is turned on;
the first voltage terminal charges the first electrode plate of the first capacitor; and
in a third phase, wherein:
the second level signal is provided to the first scanning signal terminal and the second scanning signal terminal;
the first level signal is provided to the light emitting signal terminal;
the driving transistor and the first transistor are turned on;
the first voltage terminal charges the first electrode of the driving transistor;
the light emitting control module turns on the second electrode plate of the first capacitor and the gate of the driving transistor, and a potential of the gate of the driving transistor rises under the coupling of the first capacitor; and
the organic light emitting diode emits light under a voltage difference between the gate and the first electrode of the driving transistor;
and
wherein a voltage value of the first initialization signal is greater than a sum of a voltage value of the second initialization signal and a threshold voltage of the driving transistor.

2. The organic light emitting display panel according to claim 1 , wherein the initialization module comprises a second transistor and a third transistor;
wherein a gate of the second transistor is electrically connected to the first scanning signal terminal, a first electrode of the second transistor is electrically connected to the first initialization signal terminal, and a second electrode of the second transistor is electrically connected to the gate of the driving transistor; and
wherein a gate of the third transistor is electrically connected to the second scanning signal terminal, a first electrode of the third transistor is electrically connected to the second initialization signal terminal, and a second electrode of the third transistor is electrically connected to the first electrode of the driving transistor.

3. The organic light emitting display panel according to claim 1 , wherein the data writing module comprises a fourth transistor, a gate of the fourth transistor is electrically connected to the first scanning signal terminal, a first electrode of the fourth transistor is electrically connected to the data signal terminal, and a second electrode of the fourth transistor is electrically connected to the second electrode plate of the first capacitor.

4. The organic light emitting display panel according to claim 1 , wherein the first electrode of the driving transistor is electrically connected to the anode of the organic light emitting diode.

5. The organic light emitting display panel according to claim 1 , wherein the light emitting control module further comprises a fifth transistor; and
wherein a gate of the fifth transistor is electrically connected to the light emitting signal terminal, a first electrode of the fifth transistor is electrically connected to the first electrode of the driving transistor, and a second electrode of the fifth transistor is electrically connected to the anode of the organic light emitting diode.

6. The organic light emitting display panel according to claim 1 , wherein the initialization module further comprises a sixth transistor; and
wherein a gate of the sixth transistor is electrically connected to the second scanning signal terminal, a first electrode of the sixth transistor is electrically connected to the second initialization signal terminal, and a second electrode of the sixth transistor is electrically connected to the anode of the organic light emitting diode.

7. The organic light emitting display panel according to claim 1 , wherein a voltage difference between the first initialization signal and the second voltage terminal is less than a sum of the threshold voltage of the driving transistor and a break-over voltage of the organic light emitting diode; and
wherein a voltage difference between the second initialization signal and the second voltage terminal is less than the break-over voltage of the organic light emitting diode.

8. The organic light em

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Xiang Dongxu
• Li Yue
• Zhu Renyuan
• Liu Gang

Classifications

• G09G3/3233

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

• G09G2300/0814

  used for selection purposes, e.g. logical AND for partial update · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2300/0819

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

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title