Organic Light Emitting Display Device and Method and Driving Circuit for Prolonging Half-life Period Thereof

• US 20140210806A1
• Filed: 01/31/2013
• Published: 07/31/2014
• Est. Priority Date: 01/29/2013
• Status: Abandoned Application

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Hwang, Tai-jiun
• Application Number:
  US13/820,506
• Publication Number:
  US 20140210806A1
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3225 using an active matrix

Abstract

An OLED device includes a power detection unit for detecting a power detection signal when turning on, a test image generation unit for generating a test image signal when a selection unit selects the test image signal to transmit according to the power detection signal and a timing control unit drives an OLED panel according to the test image signal, a current-adjusting unit for adjusting and holding real-time current complying with a predetermined current if the current-adjusting unit detects that the real-time current of the OLED panel is lower than the predetermined current, and a normal image signal input terminal for inputting normal image signal to control the selection unit to transmit the normal image signal, and then the OLED panel displays a normal image according to normal image signal from the timing control unit and the hold real-time current complying with the predetermined current provided by the current-adjusting unit.

Claims

1. An organic light emitting display (OLED) device comprising:

an OLED panel for displaying an image;

a power detection unit for generating a power detection signal from the OLED device when the OLED device turns on;

a testing image generation unit for generating a testing image signal;

a selection unit for selecting to transmit the test image signal upon receiving the power detection signal;

a timing control unit for driving the OLED panel to display a test image according to the test image signal;

a current-adjusting unit for adjusting a real-time current complying with a predetermined current and holding the real-time current complying with the predetermined current if the current-adjusting unit detects that the real-time current of the OLED panel provided by a power circuit is lower than the predetermined current when the test image is displayed; and

a normal image signal input terminal for inputting a normal image signal,

wherein the selection unit selects to transmit the normal image signal upon receiving the normal image signal, and the OLED panel displays a normal image according to the normal image signal from the timing control unit and the hold real-time current complying with the predetermined current provided by the current-adjusting unit.

2. The OLED device of claim 1, wherein the current-adjusting unit comprises a current detection unit and a half-life period control unit, the half-life period control unit generates a control signal to change a voltage from the power circuit to adjust the real-time current complying with the predetermined current and holds the real-time current complying with the predetermined current when the current detection unit detects that the real-time current of the OLED panel provided by the power circuit is lower than the predetermined current.

3. The OLED device of claim 1 further comprising a timing unit for generating a time signal when a predetermined time is up, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

4. The OLED device of claim 2 further comprising a timing unit for generating a time signal when a predetermined time is up, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

5. The OLED device of claim 1 further comprising an external control signal input terminal for inputting an external control signal, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

6. The OLED device of claim 2 further comprising an external control signal input terminal for inputting an external control signal, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

7. A method for prolonging a half-life period of an OLED device, comprising:

a) detecting a power detection signal from the OLED device while the OLED device turns on;

b) generating a test image signal;

c) transmitting the test image signal when a selection unit receives the power detection signal;

d) driving the OLED panel to display a test image according to the test image signal;

e) detecting a real-time current from a power circuit to the OLED panel and comparing the detected real-time current with a predetermined current;

f) adjusting the real-time current complying with the predetermined current and holding the real-time current complying with the predetermined current if the real-time current is lower than the predetermined current;

g) transmitting the normal image signal when the selection unit receives the normal image signal, driving the OLED panel according to the normal image signal and providing the hold real-time current complying with the predetermined current to the OLED panel so that the OLED panel displays the normal image.

8. The method of claim 7, wherein the OLED device comprises a timing unit for generating a time signal when a predetermined time is up, and the step g) comprises:

transmitting the test image signal when the selection unit receives the time signal and then return the step d).

9. The method of claim 7, wherein the OLED device comprises an external control signal input terminal for inputting an external control signal, and the step g) comprises:

transmitting the test image signal when the selection unit receives the external control signal, and then return the step d).

10. A driving circuit for driving an organic light emitting display (OLED) device, comprising:

a power detection unit for generating a power detection signal when an OLED device having an OLED panel turns on;

a testing image generation unit for generating a testing image signal;

a selection unit for selecting to transmit the test image signal upon receiving the power detection signal;

a timing control unit for driving the OLED panel to display a test image according to the test image signal;

a current-adjusting unit for adjusting a real-time current complying with a predetermined current and holding the real-time current complying with the predetermined current if the current-adjusting unit detects that the real-time current of the OLED panel provided by a power circuit is lower than the predetermined current when the test image is displayed; and

a normal image signal input terminal for inputting a normal image signal,

wherein the selection unit selects to transmit the normal image signal upon receiving the normal image signal, and the OLED panel displays a normal image according to the normal image signal from the timing control unit and the hold real-time current complying with the predetermined current provided by the current-adjusting unit.

11. The driving circuit of claim 10, wherein the current-adjusting unit comprises a current detection unit and a half-life period control unit, the half-life period control unit generates a control signal to change a voltage from the power circuit to adjust the real-time current complying with the predetermined current and holds the real-time current complying with the predetermined current when the current detection unit detects that the real-time current of the OLED panel provided by the power circuit is lower than the predetermined current.

12. The driving circuit of claim 10 further comprising a timing unit for generating a time signal when a predetermined time is up, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

13. The driving circuit of claim 11 further comprising a timing unit for generating a time signal when a predetermined time is up, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

14. The driving circuit of claim 10 further comprising an external control signal input terminal for inputting an external control signal, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.

15. The driving circuit of claim 11 further comprising an external control signal input terminal for inputting an external control signal, and the selection unit selects the test image signal to transmit according to the time signal when the OLED panel displays the normal image.