Organic light emitting display and driving method of operating the same
AssigneeSamsung Display Co., Ltd.
InventorHyun Sik Kim
Life of this patent
Estimating the term…
Abstract
An organic light emitting display, including a first data line extending along a first direction, a second data line extending along the first direction and disposed parallel to the first data line, a first scan line extending along a second direction perpendicular to the first direction, a first pixel connected to the first data line and the first scan line, a second pixel connected to the second data line and the first scan line, a first constant current source connected to the first data line, a second constant current source connected to the second data line, and a temperature information generation unit comprising a first input port connected to the first data line and a second input port connected to the second data line.
Claims10
An organic light emitting display, comprising:
- a first data line extending along a first direction;
- a second data line extending along the first direction and disposed parallel to the first data line;
- a first scan line extending along a second direction perpendicular to the first direction;
- a first pixel connected to the first data line and the first scan line;
- a second pixel connected to the second data line and the first scan line;
- a first constant current source connected to the first data line and configured to generate a first driving current in a driving transistor of the first pixel;
- a second constant current source connected to the second data line and configured to generate a second driving current in a driving transistor of the second pixel, the second driving current being different than the first driving current;
- and
- a temperature circuit comprising a first input port connected to the first data line and a second input port connected to the second data line,
- wherein the first driving current and the second driving current are driving currents corresponding to a sub-threshold region of the driving transistor,
- wherein the sub-threshold region being a voltage range in which the driving current has an exponential relationship with a temperature of the driving transistor, and
- wherein the temperature circuit is configured to generate:
- a first temperature information by using the first driving current and the second driving current;
- a second temperature information by using a third driving current and a fourth driving current, the third driving current is obtained by doubling the size of the first driving current, the fourth driving current is obtained by doubling the size of the second driving current;
- and
- a final temperature information by using the first temperature information and the second temperature information.
A method of driving an organic light emitting display comprising pixels arranged in a matrix form, scan lines and gate lines extending in a horizontal direction, and data lines extending in a vertical direction, the method comprising:
- activating a temperature sensing mode of the pixels;
- providing scan signals and gate signals simultaneously to the scan lines and the gate lines;
- supplying a first constant current to an ath data line and a second constant current different in size from the first constant current to a bth data line;
- calculating a voltage difference between a first voltage generated in the ath data line by the first constant current source and a second voltage generated in the bth data line by the second constant current source;
- and
- calculating a temperature information,
- wherein a is an odd-numbered constant and b is an even-numbered constant, and
- wherein calculating of the temperature information comprises:
- generating a first temperature information by using the first driving current and the second driving current;
- generating a second temperature information by using a third driving current and a fourth driving current, the third driving current being obtained by doubling the size of the first driving current, and the fourth driving current being obtained by doubling the size of the second driving current;
- and
- generating a final temperature information by using the first temperature information and the second temperature information,
- wherein a driving transistor of a pixel connected to the ath data line generates the first driving current from the first constant current;
- the driving transistor of the pixel connected to the bth data line generates the second driving current from the second constant current, the second driving current having different size with respect to the first driving current;
- and
- the first driving current and the second driving current are driving currents corresponding to a sub-threshold region of the driving transistor, the sub-threshold region being a voltage range in which the driving current has an exponential relationship with a temperature of the driving transistor.
Dependencies are inferred from the claim text.