Patent ID: 9666138
Date: 2017-05-30
CPC Classifications: G09G

Claim:
1. A display driving device for performing display drive based on display data with respect to a display unit which includes data lines each connected to a plurality of pixels arranged in a column direction and scanning lines each connected to a plurality of pixels arranged in a row direction, the pixels arranged at respective intersections of the data lines and the scanning lines, the display driving device comprising: a current setting unit including a setting register configured to store current gradation values which are set for the respective scanning lines that constitute a frame of the display data, and a buffer configured to store next current gradation values to be stored in the setting register; a current gradation control unit configured to, at each of scan timings for the respective scanning lines within one frame, generate a constant current corresponding to a current gradation value for a corresponding scanning line among the current gradation values stored in the setting register of the current setting unit; and a data line driving unit configured to supply the constant current generated by the current gradation control unit to the respective data lines for time periods corresponding to pixel gradation values defined by the display data, wherein the current gradation values stored in the setting register are set to be rewritten by the next current gradation values stored in the buffer in response to a switching of the display data displayed on the display unit; and wherein the current gradation control unit selects one or more transistors having differently-weighted current values based on the current gradation value for the corresponding scanning line and generates, as the constant current corresponding to the current gradation value, a current equal to a total sum of current values flowing in the selected transistors.