Patent ID: 8159447

Claim:
A display driving apparatus that drives display pixels included in a display panel based on display data, the display pixels being arrayed in rows and columns, each pixel including a pixel electrode, and the display panel including a plurality of scanning lines arrayed in the rows and connected to respective display pixels, the apparatus comprising: a signal generating circuit that generates a driving signal for sequentially setting the respective display pixels corresponding to the respective rows in a selected state, and that applies a signal voltage corresponding to a gradation value of the display data to a pixel electrode of each of the display pixels; wherein the signal generating circuit includes a scanning side driving circuit and a correcting circuit; wherein the scanning side driving circuit includes output terminals which output scanning signals to set the respective display pixels in the selected state; wherein the output terminals are respectively connected to ends of the plurality of scanning lines of the display panel, via respective routed interconnections that are different in resistance values from each other, wherein the correcting circuit includes a waveform correcting circuit that: (i) differentiates degrees of roundness of waveforms of the scanning signals output from the respective output terminals, in accordance with correction amounts set to correspond to the respective resistance values of the routed interconnections, and (ii) brings the waveforms of the scanning signals respectively applied to the ends of the plurality of scanning lines via the respective routed interconnections, close to a same waveform, so as to bring amounts of voltage drops caused at the pixel electrodes of the display pixels of the rows close to predetermined amounts and bring a value of the signal voltage corresponding to the gradation value of the display data that is applied to each of the display pixels set in the selected state close to a same magnitude; wherein the scanning side driving circuit further includes amplifying circuits provided to correspond to the respective output terminals to generate the scanning signals; wherein the waveform correcting circuit includes a driving capability switching circuit that switches a driving capability of each of the amplifying circuits to levels different from each other, in accordance with the corresponding correction amount, and that differentiates the degrees of roundness of the scanning signals output to the output terminals from each other; and wherein the driving capability switching circuit includes a bias current setting circuit that switches a current value of a bias current supplied to each of the amplifying circuits to values different from each other, and that switches the driving capability of each of the amplifying circuits to the different levels.