Power source, display including the same, and associated method
AssigneeSamsung Mobile Display Co., Ltd.
InventorsDo-Hyung Ryu, Do-Ik Kim
Life of this patent
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Abstract
A power source for applying a voltage to a pixel circuit, the power source including a sensing unit and a controlling unit. The sensing unit senses a current flowing through a power line coupled to the pixel circuit, the controlling unit increases a voltage applied to the power line by a first amount when the sensed current is lower than a reference, and the controlling unit decreases the voltage applied to the power line by a second amount when the sensed current is higher than the reference, the second amount being different from the first amount.
Claims17
A power source for applying a voltage to a pixel circuit having first and second power lines coupled thereto, the first power line applying a first voltage that is higher than a second voltage applied by the second power line, the first power line supplying the first voltage to an anode of a light emitting element in the pixel circuit, the power source comprising:
- a sensing unit;
- and
- a controlling unit, wherein:
- the sensing unit senses a current flowing to the pixel circuit, and
- the controlling unit increases the first voltage applied to the first power line until the sensed current is greater than a reference and then decreases the first voltage applied to the first power line so as to bring the sensed current down, the controlling unit increasing the first voltage applied to the first power line by a first amount when the sensed current is lower than the reference, and subsequently decreasing the first voltage applied to the first power line by a second amount to decrease the sensed current from a first level higher than the reference to a second level that is closer to the reference, the second amount being less than the first amount, an absolute value of increments to the first voltage applied to the first power line being larger than an absolute value of decrements to the first voltage applied to the first power line.
A display, comprising:
- a pixel circuit;
- a first power line coupled to the pixel circuit between the pixel circuit and a power source, the first power line supplying a first voltage to an anode of a light emitting element in the pixel circuit, the power source including a sensing unit and a controlling unit;
- and
- a second power line coupled to the pixel circuit, the first voltage being higher than a second voltage applied by the second power line, wherein:
- the sensing unit senses a current flowing to the pixel circuit, and
- the controlling unit increases the first voltage applied to the first power line until the sensed current is greater than a reference and then decreases the first voltage applied to the first power line so as to bring the sensed current down, the controlling unit increasing the first voltage applied to the first power line by a first amount when the sensed current is lower than the reference, and subsequently decreasing the first voltage applied to the first power line by a second amount when the sensed current is higher than the reference, the second amount being less than the first amount, an absolute value of increments to the first voltage applied to the first power line being larger than an absolute value of decrements to the first voltage applied to the first power line.
A method of controlling a voltage applied to a pixel circuit having first and second power lines coupled thereto, the first power line applying a first voltage that is higher than a second voltage applied by the second power line, the first power line supplying the first voltage to an anode of a light emitting element in the pixel circuit, the method comprising:
- sensing a current flowing to the pixel circuit;
- increasing the first voltage applied to the first power line until the sensed current is greater than a reference and then decreasing the first voltage applied to the first power line so as to bring the sensed current down from a first level that is higher than the reference to a second level that is closer to the reference, the first voltage applied to the first power line being increased by a first amount when the sensed current is lower than the reference, and subsequently being decreased by a second amount when the sensed current is higher than the reference, the second amount being less than the first amount, an absolute value of increments to the first voltage applied to the first power line is larger than an absolute value of decrements to the first voltage applied to the first power line.
Dependencies are inferred from the claim text.