Patent ID: 8368684

Claim:
An organic light emitting display device, comprising: a pixel unit including a plurality of pixels connected to scan lines and data lines; a data driving unit configured to receive a first data or a second data and to provide data signals corresponding to the first or second data to the data lines; a timing controlling unit configured to control the data driving unit and to supply the first data input from the outside; a power supply configured to supply electric power to the pixel unit, the data driving unit, and the timing controlling unit; a converting unit configured to receive the first data from the timing controlling unit, convert the first data into the second data, and transmit the converted second data to the data driving unit; and a switching unit configured to receive the first data from the timing controlling unit and to output the first data to one of the data driving unit and the converting unit in accordance with at least one of a user input and a capacity of the power supply, wherein, when the first data supplied from the timing controlling unit has a digital bit corresponding to one of a first range and a second range, the converting unit is configured to convert the first data into the second data having a digital bit corresponding to the second range and the first range, respectively, the first range corresponding to a predetermined number of grayscales starting at 255, and the second range corresponding to the predetermined number of grayscales starting at 0.