Organic electroluminescent display device

1. An organic electroluminescent display device, comprising:

a display in which pixels are arranged in rows and columns, the pixels each including an organic electroluminescent element; a drive transistor which drives light emission of the organic electroluminescent element; and a capacitor having a first electrode to which a gate potential of the drive transistor is applied and a second electrode to which a potential of one of a drain and a source of the drive transistor is applied;

a power supply configured to generate a supply voltage;

a signal driver disposed on an electrical path between the power supply and the display, the signal driver configured to

apply a fixed voltage corresponding to the supply voltage to at least one of the first electrode and the second electrode, and

output a data signal corresponding to a video signal and a select signal which selects a pixel to be supplied with the data signal among the pixels; and

a timing controller disposed on an electrical path between the power supply and the signal driver, the timing controller configured to

carry to the signal driver the supply voltage output from the power supply, and

indicate to the signal driver a time at which the signal driver is to output the data signal and the select signal,

wherein the signal driver includes a buffer amplifier circuit which suppresses a variable component of the supply voltage carried from the power supply to stabilize the fixed voltage corresponding to the supply voltage, and supplies the stabilized, fixed voltage to the at least one of the first electrode and the second electrode,

the signal driver includes a gate driver having a plurality of gate driver integrated circuits and a gate driver board connecting the plurality of gate driver integrated circuits and the timing controller, and

a first buffer amplifier circuit is mounted on the gate driver board.

2. The organic electroluminescent display device according to claim 1 ,

wherein the fixed voltage is at least one of a reference supply voltage and an initialization supply voltage, the reference supply voltage being applied to the first electrode to cause the capacitor to hold a threshold voltage of the drive transistor, the initialization supply voltage being applied to the second electrode.

3. The organic electroluminescent display device according to claim 2 ,

wherein the signal driver includes a gate driver configured to output the select signal,

a data driver is configured to output the data signal,

the data driver includes a plurality of source driver integrated circuits and a source driver board connecting the plurality of source driver integrated circuits and the timing controller,

the display is disposed on a front surface of a display panel,

the power supply, the timing controller, a line electrically connecting the timing controller and the signal driver, and the buffer amplifier circuit are disposed on a back surface of the display panel,

the first buffer amplifier circuit outputs to the plurality of gate driver integrated circuits the reference supply voltage stabilized by suppressing the variable component of the supply voltage, and

a second buffer amplifier circuit, which outputs to the plurality of source driver integrated circuits the initialization supply voltage stabilized by suppressing the variable component of the supply voltage, is mounted on the source driver board.

4. The organic electroluminescent display device according to claim 3 ,

wherein the gate driver includes:

a first gate driver board disposed on a left edge portion of the display panel and connecting the timing controller and gate driver integrated circuits among the plurality of gate driver integrated circuits; and

a second gate driver board disposed on a right edge portion of the display panel and connecting the timing controller and gate driver integrated circuits among the plurality of gate driver integrated circuits.

5. The organic electroluminescent display device according to claim 3 ,

wherein the data driver includes:

a first source driver board disposed on a top edge portion of the display panel and connecting the timing controller and source driver integrated circuits among the plurality of source driver integrated circuits; and

a second source driver board disposed on a bottom edge portion of the display panel and connecting the timing controller and source driver integrated circuits among the plurality of source driver integrated circuits.

6. The organic electroluminescent display device according to claim 3 ,

wherein while causing the gate driver to select a pixel row-by-row, the timing controller is configured to cause the capacitor to hold the threshold voltage of the drive transistor row-by-row by causing the gate driver to apply the reference supply voltage to the first electrode of the capacitor and causing the data driver to apply the initialization supply voltage to the second electrode of the capacitor.

7. The organic electroluminescent display device according to claim 3 ,

wherein the first buffer amplifier circuit includes a first amplifying element having a positive power supply terminal to which the supply voltage carried via the timing controller is input, a positive input terminal to which a predetermined positive voltage generated by the timing controller is input, and a negative input terminal and an output terminal which are shorted, and

the second buffer amplifier circuit includes a second amplifying element having a negative power supply terminal to which the supply voltage carried via the timing controller is input, a positive input terminal to which a predetermined negative voltage generated by the timing controller is input, and a negative input terminal and an output terminal which are shorted.