Pixel driving circuit and pixel driving method
AssigneeAu Optronics Corporation
InventorLi-Wei Shih
Life of this patent
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Abstract
A pixel driving circuit for use in an Active Matrix Organic Light Emission Display (AMOLED). A pixel driving method for use in the AMOLED. The pixel driving circuit comprises a current source, a driving pump, and a discharge circuit. A fixed current is provided by the current source. The driving pump coupled to the current source and a Light Emitting Diode (LED), charges a cell to saturation by the fixed current, such that the potential of the cell drives the LED lighting. The discharge circuit, coupled to the driving pump and a data line, controls the cell discharge based on a data signal on the data line. The discharge circuit controls the cell discharge speed, whereby the LED lighting time and luminance is adjusted.
Claims15
A pixel driving circuit for an active matrix organic light emission display (AMOLED) having a plurality of organic light emitting diodes (OLEDs), each controlled by a data line and a scan line, comprising:
- a current source;
- a driving pump, coupled to the current source and one of the plurality of OLEDs, for charging a cell to saturation by the current source;
- and
- a discharge circuit, coupled to the driving pump and the data line, for controlling the cell discharge speed based on a data signal from the data line, whereby the OLED lighting time and luminance is adjusted;
- wherein:
- the discharge circuit is coupled to the scan line;
- and
- in response to a second signal from the scan line, the potential of the cell drives the OLED lighting, and simultaneously, the discharge circuit discharges the cell at a speed corresponding to the data signal.
A pixel driving method for an active matrix organic light emission display (AMOLED) having an organic light emitting diode (OLED), comprising:
- providing a data signal;
- providing, in response to a first signal, a fixed current to charge a cell to saturation;
- driving, in response to a second signal, the OLED lighting by the potential of the cell simultaneously when discharging the cell, into a discharge circuit, at a speed corresponding to the data signal;
- wherein the data signal is adapted to control the cell discharge speed, thereby adjusting the OLED lighting time and luminance.
Dependencies are inferred from the claim text.