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AssigneeHana Micron Inc.
InventorsHong-Jae Shin, Kae-Dal Kwack
Estimating the term…
There are provided an organic light emitting diode (OLED) display driving apparatus and a driving method thereof, in which the OLED display panel driving apparatus of a passive matrix type is configured such that its scan driving circuit has 3-state output, and the cathode lines, selected when the scan driving circuit performs a scan operation, maintain grounding, and after data-applied OLED emits light, are switched in a high voltage, and execute a refresh operation to initialize the pixel charges, and with the high impedance state maintained, non-selective common cathode lines turn into a high impedance state so as to remove the parasitic capacitance elements, and reduce the capacitance element functioning as the load of the data driving circuit connected to the OLED anode lines, and without the use of precharge method of maintaining the anode lines above a predetermined voltage quickly by using a voltage source, and applying data by using a current source, the anode lines can be charged within a short time just by necessary current for the lightening of the OLED so as to reduce the power consumption of the data driving circuit, and increase the operation speed.
An OLED panel driving apparatus having an OLED in each intersecting point of a plurality of common anode lines and a plurality of common cathode lines, which are aligned in a matrix configuration, to form a pixel, the OLED panel driving apparatus further comprising:
A method of driving an OLED panel having an OLED in each intersecting point of a plurality of common anode lines and a plurality of common cathode lines, which are aligned in a matrix configuration, to form a pixel, the method including the step of maintaining, in a high impedance state, the common cathode lines in the rest of the rows except one row of the currently scanned common cathode line while being sequentially scanned after converted into grounding level GND in the process of applying constant current to the common anode lines by a control signal PWM having various time width in accordance with gray level of displayed pixel data.
Dependencies are inferred from the claim text.