Organic Light Emitting Display Device and Display Panel Thereof
AssigneeLG Display Co., Ltd.
InventorsWooJin Nam, HongJae Shin
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Abstract
Disclosed are an organic light emitting display device and a display panel thereof, which are capable of performing a recovery driving for recovering a threshold voltage of a driving transistor to be within a range of compensation for the threshold voltage if the threshold voltage of the driving transistor deviates from the range of the compensation for the threshold voltage as a driving time of the driving transistor of a pixel increases.
Claims15
An organic light emitting display device, comprising:
- a display panel including a data line and first and second gate lines;
- a gate driving circuit, the first and second gate lines electrically connected to the gate driving circuit;
- a pixel defined at an intersection of the data line and the first and second gate lines,
- wherein the pixel includes a driving transistor and an organic light emitting diode, the driving transistor configured to supply current to the organic light emitting diode, and the driving transistor having a threshold voltage;
- wherein a range of compensation for the threshold voltage of the driving transistor has at least one of an upper voltage limit and a lower voltage limit,
- wherein the display device is configured to
- sense the threshold voltage of the driving transistor;
- and,
- apply a first voltage to a first node of the driving transistor and apply a second voltage to a second node of the driving transistor, when the threshold voltage of the driving transistor is outside of the range of compensation, and
- regulate the first and second voltages so that the threshold voltage of the driving transistor is within the range of compensation,
- wherein the first node electrically connects to a gate of the driving transistor, and the second node electrically connects to an anode or cathode of the organic light emitting diode.
A method of compensating for a threshold voltage of a driving transistor, the driving transistor included in a specific pixel of a plurality of pixels of an organic light emitting display device, the method comprising:
- determining that the threshold voltage is deviated from a predetermined range of compensation of the threshold voltage;
- when the display device is to be powered off, performing recovery driving of the threshold voltage to be within the range of compensation;
- and
- after performing the recovery driving, applying a ground voltage to all nodes of the driving transistor.
Dependencies are inferred from the claim text.