Current supply circuit and display device having the current supply circuit

A current supply circuit providing an output current corresponding to digital data of n bits (wherein n is an integer not less than 2), comprising:

• a current driving device,
• a current output node electrically connected to a first power supply node via said current driving device during current supply;
• a current control circuit provided between a second power supply node and said current output node and receiving digital data, corresponding to the digital data, for controlling current flowing in a current path including said current output node, between the first and second power supply nodes during the current supply;
• and
• a voltage regulating circuit receiving the digital data for moving, prior to the current supply, a voltage on said current output node closer to a voltage corresponding to the digital data.

A display device producing a gray-scale display corresponding to image data of n bits (wherein n is an integer not less than 2), comprising:

• a current supply circuit for supplying a display current corresponding to the image data;
• a plurality of pixel circuits, each pixel circuit including a current-driven light-emitting device providing a brightness corresponding to a supplied current and a pixel driving circuit for supplying said current-driven light-emitting device with a current corresponding to the display current;
• and
• a current data line for conveying the display current, which is provided by said current supply circuit, to said plurality of pixel circuits, wherein
• said pixel driving circuit has a current driving device connected between said current data line and a first power supply node during a predetermined period in which the display current is conveyed thereto, and supplies said current-driven light-emitting device with a current corresponding to the display current conveyed during the predetermined period, and
• said current supply circuit includes:
• a current control circuit provided between a second power supply node and said current data line and receiving the image data for controlling, corresponding to the image data, current flowing in a current path, including said current data line, between said first and second power supply nodes during supply of said display current;
• and
• a voltage regulating circuit receiving said image data for forcing, after supply of said display current starts, a change in voltage on said current data line based on said image data.