DA converter, data line driving circuit, electro-optical device, driving method thereof, and electronic apparatus

Abstract

To simplify s configuration of a current mode DA converter. A data line driving circuit includes DA converting units U 1 to Un. Each DA converting unit U 1 to Un a voltage DA converting circuit for generating an analog voltage signal Sv based on image data, a V/I converting circuit for converting the analog voltage signal Sv into an analog current signal Si, and a voltage current selector for selecting one of the analog voltage signal Sv and the analog current signal Si based on a pre-charge control signal CTL. In addition, the analog voltage signal Sv outputted from the voltage current selector serves as a pre-charge voltage, and the analog current signal Si serves as a driving current of an OLED element.

1 . A data line driving circuit connected to a plurality of data lines, comprising:
 a plurality of DA converters provided corresponding to the plurality of data lines; and   reference voltage generating means for generating a plurality of reference voltages and supplying the plurality of reference voltages to the plurality of DA converters, respectively,   wherein each of the plurality of DA converters includes:
 voltage selecting means for selecting one of the plurality of reference voltages, based on image data, and outputting the selected reference signal as an analog voltage signal; and 
 voltage to current converting means for converting the analog voltage signal into an analog current signal, the voltage to current converting means includes gain adjusting means for adjusting a gain of the voltage to current conversion based on gain control data. 
   
   
   
       2 . The data line driving circuit according to  claim 1 ,
 wherein the gain control data is independently set for each color of RGB to adjust a white balance.   
   
   
       3 . The data line driving circuit according to  claim 1 ,
 wherein each of the plurality of DA converters includes voltage current selecting means for selecting one of the analog voltage signal and the analog current signal, based on a select control signal, and outputting the selected signal to the data lines.   
   
   
       4 . An electro-optical device comprising:
 the data line driving circuit according to  claim 3 ; and   control means for controlling the voltage current selecting means to output the analog voltage signal during a first interval from a start of one horizontal scan period until a predetermined time elapses, generating a signal for controlling the voltage current selecting means to output the analog current signal during a second interval until the one horizontal scan period ends after the first interval ends, and supplying the signal for controlling the voltage current selecting means to the voltage to current converting means of the plurality of DA converters, as the select control signal, respectively.   
   
   
       5 . The electro-optical device according to  claim 4 ,
 wherein the data line driving circuit is configured by a plurality of driver IC chips, the gain control data is independently set for each driver IC chip.   
   
   
       6 . An electronic apparatus including the electro-optical device according to  claim 4 .