Patent ID: 7589718

Claim:
An electric apparatus, comprising: a DC-to-DC converter for converting a first direct voltage into a second direct voltage; at least one executing unit for receiving the second direct voltage and executing a system function of the electric apparatus; and an OELD (Organic Electro-Luminescence Display), for receiving the first direct voltage or the second direct voltage, comprising a data driver for outputting a pixel voltage and a plurality of pixels, wherein each of the pixels comprises: an organic electro-luminescence diode; and a transistor having a source for receiving the first direct voltage or the second direct voltage, a gate for receiving the pixel voltage, and a drain electrically connected to the organic electro-luminescence diode, wherein: at least one first potential difference and at least one second potential difference exist between the source and the gate of the transistor; the at least one first potential difference is generated when the organic electro-luminescence diode has a maximum luminance, and the at least one second potential difference is generated when the organic electro-luminescence diode has a minimum luminance; and when the first direct voltage or the second direct voltage changes, the data driver controls the pixel voltage according to a variation of the first direct voltage or a variation of the second direct voltage, such that the pixel voltage has a variation substantially the same as the variation of the first direct voltage or the variation of the second direct voltage, and the at least one first potential difference and the at least one second potential difference are substantially held constant.