Organic light emitting diode display

• US 20100103160A1
• Filed: 08/06/2009
• Published: 04/29/2010
• Est. Priority Date: 10/28/2008
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Keunchoul, Jeon, Changhoon
• Granted Patent: US 8,482,555 B2
• Time in Patent Office: Days
• US Class Current: 345/213
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2330/045 Protection against panel overheating
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An organic light emitting diode (OLED) display is provided. The OLED display includes a display panel including pixels formed at each of crossings of a plurality of gate lines and a plurality of data lines, a monitoring signal line formed along an outer area of the display panel, a first signal supply unit that supplies a monitoring signal to the monitoring signal line and generates a first power control signal, a power supply unit that supplies a high potential driving voltage and a low potential driving voltage to the pixels, and a second signal supply unit that monitors the monitoring signal and generates a second power control signal. If the monitoring signal is not monitored, the second signal supply unit controls the power supply unit through the second power control signal and allows the power supply unit to stop supplying one of the high and low potential driving voltages to the pixels.

Claims

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

a display panel including pixels formed at each of crossings of a plurality of gate lines and a plurality of data lines;

a monitoring signal line formed along an outer area of the display panel on which an image is not displayed;

a first signal supply unit that supplies a monitoring signal to the monitoring signal line and generates a first power control signal;

a power supply unit that supplies a high potential driving voltage and a low potential driving voltage to the pixels in response to the first power control signal; and

a second signal supply unit that monitors the monitoring signal and generates a second power control signal based on a monitoring result,

wherein if the monitoring signal is not monitored in a state where the high and low potential driving voltages are supplied to the pixels, the second signal supply unit controls the power supply unit using the second power control signal and allows the power supply unit to stop supplying one of the high and low potential driving voltages to the pixels.

2. The OLED display of claim 1, further comprising:

a source driver driving the data lines;

a scan driver driving the gate lines;

a timing controller controlling operation timing of the source driver and operation timing of the scan driver; and

a system that supplies digital video data and timing signals to the timing controller,

wherein the first signal supply unit is built in the timing controller and the second signal supply unit is built in the system.

3. The OLED display of claim 1, further comprising:

a source driver driving the data lines;

a scan driver driving the gate lines;

a timing controller controlling operation timing of the source driver and operation timing of the scan driver; and

a system that supplies digital video data and timing signals to the timing controller,

wherein the first and the second signal supply units are built in the timing controller.

4. The OLED display of claim 2, wherein the monitoring signal is a signal requiring data of one frame to be displayed on the display panel, and

wherein the monitoring signal is generated by the timing controller and then is supplied to the system through the monitoring signal line.

5. The OLED display of claim 3, wherein the monitoring signal is a signal requiring data of one frame to be displayed on the display panel, and

wherein the monitoring signal is generated by the timing controller and then is supplied to the system through the monitoring signal line.

6. An organic light emitting diode (OLED) display comprising:

a display panel including pixels formed at each of crossings of a plurality of gate lines and a plurality of data lines;

a monitoring signal line formed along an outer area of the display panel on which an image is not displayed;

a signal supply unit that supplies a monitoring signal to the monitoring signal line and generates a power control signal;

a power supply unit that supplies a high potential driving voltage and a low potential driving voltage to the pixels in response to the power control signal; and

a data adjusting unit that monitors the monitoring signal and adjusts a level of digital video data to be displayed on the display panel based on a monitoring result,

wherein if the monitoring signal is not monitored in a state where the high and low potential driving voltages are supplied to the pixels, the data adjusting unit adjusts the level of the digital video data at a level capable of turning off a driving thin film transistor (TFT) of each of the pixels.

7. The OLED display of claim 6, further comprising:

a source driver driving the data lines;

a scan driver driving the gate lines;

a timing controller controlling operation timing of the source driver and operation timing of the scan driver; and

a system that supplies the digital video data and a timing signal to the timing controller,

wherein the signal supply unit and the data adjusting unit are built in the timing controller.

8. The OLED display of claim 7, wherein the monitoring signal is a signal requiring data of one frame to be displayed on the display panel,

wherein the monitoring signal is generated by the timing controller and then is supplied to the system through the monitoring signal line.