Abstract: A signal processing unit that generates data signals for controlling gray-scale levels of electro-optical elements includes a first D/A conversion unit that generates gray-scale signals from gray-scale data for designating the gray-scale levels of the electro-optical elements; a storage unit that stores correction data indicating correction values with respect to the gray-scale signals; a second D/A conversion unit that has resolution different from that of the first D/A conversion unit, and that generates correction signals from the correction data stored in the storage unit; and a synthesizing unit that synthesizes the gray-scale signals generated by the first D/A conversion unit with the correction signals generated by the second D/A conversion unit to generate the data signals.

Abstract: An electro-optical device includes a plurality of pixel circuits each including a light-emitting element and a driving transistor for driving the light-emitting element; data lines that are connected to the plurality of pixel circuits and that supply data signals representing light-emitting gray-scale levels to the pixel circuits; and a data line driving circuit that supplies the data signals to the pixel circuits through the data lines. In addition, the data line driving circuit applies to each pixel circuit in a predetermined sequence a forward frame period supplying a data signal having a forward bias voltage for making the light-emitting element emit light and a backward frame period supplying a data signal having a backward bias voltage for making the light-emitting element not emit light, and drives each of the pixel circuits.

Abstract: A data line driving circuit connected to data lines includes a bit shift unit that outputs input digital data composed of a plurality of bits for defining the brightness of pixels or bit-shifts the plurality of bits to lower levels to output them, based on a control signal, and a supply unit that supplies the output digital data of the bit shift unit to a D/A conversion unit. The D/A conversion unit supplies gray-scale signals obtained by D/A converting the output digital data of the supply unit to the data lines.

Abstract: A signal processing unit that generates data signals for controlling gray-scale levels of electro-optical elements includes a first D/A conversion unit that generates gray-scale signals from gray-scale data for designating the gray-scale levels of the electro-optical elements; a storage unit that stores correction data indicating correction values with respect to the gray-scale signals; a second D/A conversion unit that has resolution different from that of the first D/A conversion unit, and that generates correction signals from the correction data stored in the storage unit; and a synthesizing unit that synthesizes the gray-scale signals generated by the first D/A conversion unit with the correction signals generated by the second D/A conversion unit to generate the data signals.

Abstract: To correct brightness by measuring with accuracy and high speed variation of the brightness between pixels of an organic EL display. A first correction data memory stores a first correction data Dhy in a row direction, and a second correction data memory stores second correction data Dhx in a column direction. A first operation circuit generates a pixel correction data DH based on the first correction data Dhy and the second correction data Dhx. The pixel correction data DH is stored into a pixel correction data memory. Input gray scale data Din is corrected by the pixel correction data DH to output as output gray scale data Dout.

Abstract: To adjust brightness of an electro-optic device for each pixel. A data line driving circuit includes a DAC for generating a gray-scale current according to gray-scale data representing gray-scales of pixels, and a DAC for generating a correction current for correcting the brightness of the pixels. The data line driving circuit generates a voltage according to a current obtained by adding the correction current generated in the DAC to the gray-scale current in the DAC and applies the generated voltage to each data line.

Abstract: The present invention controls reactive current to be low so that expensive components are not required and costs are decreased. According to the present invention, serial circuits of two switching elements are connected between the positive and negative electrodes of a DC power supply, a tertiary winding 6 and a quaternary winding are added to a transformer of a DC/DC converter where a serial circuit of a capacitor and a transformer primary winding are connected to the switching element in parallel, an ON/OFF signal is applied to the switching element via the tertiary winding, the quaternary winding becomes a winding for the power supply of a control circuit, the timing of the switching of the positive/negative of the quaternary winding voltage is detected by this control circuit, and an ON/OFF signal is applied to the switching element at this timing. By decreasing the ON time of the switching element, the reactive current can be decreased.

Abstract: The present invention controls reactive current to be low so that expensive components are not required and costs are decreased. According to the present invention, serial circuits of two switching elements are connected between the positive and negative electrodes of a DC power supply, a tertiary winding 6 and a quaternary winding are added to a transformer of a DC/DC converter where a serial circuit of a capacitor and a transformer primary winding are connected to the switching element in parallel, an ON/OFF signal is applied to the switching element via the tertiary winding, the quaternary winding becomes a winding for the power supply of a control circuit, the timing of the switching of the positive/negative of the quaternary winding voltage is detected by this control circuit, and an ON/OFF signal is applied to the switching element at this timing. By decreasing the ON time of the switching element, the reactive current can be decreased.