Driver Circuit of AMOLED with Gamma Correction
AssigneeHimax Technologies Limited
InventorChen Yu Wang
Life of this patent
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Abstract
A driver circuit of an AMOLED (active matrix organic light emitting diode) with gamma correction includes a voltage selector, an operational amplifier, a MOS transistor, and a resistive element. The voltage selector selects one of a plurality of gamma voltages. The operational amplifier receives the selected gamma voltage and a feedback signal to generate a control signal. The MOS transistor provides the feedback signal and conducts a current associated with a current type pixel circuit in response to the control signal. The resistive element is coupled to a first voltage end and an inverted input end of the operational amplifier for determining the current with the selected gamma voltage.
Claims16
A driver circuit of an AMOLED with gamma correction, comprising:
- a voltage selector selecting one of a plurality of gamma voltages;
- an operational amplifier receiving the selected gamma voltage and a feedback signal to generate a control signal;
- a MOS transistor providing the feedback signal and conducting a current associated with a current type pixel circuit in response to the control signal;
- and
- a resistive element coupled to a first voltage end and an inverted input end of the operational amplifier for determining the current with the selected gamma voltage.
A driver circuit providing a driving current of a pixel according to a pixel value, comprising:
- a voltage selector selecting one of a plurality of gamma voltages;
- an impedance having one end coupled to receive a supply voltage and the other end coupled to a reference node;
- and
- a transistor having a drain coupled to the pixel and a source coupled to the reference node;
- wherein a gate of the transistor is connected so that the transistor conducts a driving current for the pixel when a reference voltage corresponding to the pixel value is applied to the reference node.
Dependencies are inferred from the claim text.