Driving circuit of flat display device, and flat display device

1. A driving circuit of a flat display device, said driving circuit generating driving signals by subjecting image data to digital-to-analog conversion processing, and driving signal lines of a display unit formed by arranging pixels in a form of a matrix by said driving signals, said driving circuit comprising:

an original reference voltage generating circuit for generating a plurality of original reference voltages;

a reference voltage generating circuit formed by connecting a plurality of voltage divider circuits in series with each other, said voltage divider circuits each being formed by connecting a plurality of resistances in series with each other, said original reference voltages being inputted to both ends of said voltage divider circuits and between said voltage divider circuits, respectively, said reference voltage generating circuit outputting a plurality of reference voltages as voltages divided by said plurality of voltage divider circuits;

a plurality of selecting circuits for outputting said driving signals by receiving said plurality of reference voltages and selecting and outputting the reference voltages according to said image data for corresponding signal lines; and

an input circuit for inputting original reference voltage setting data for specifying settings of said original reference voltages;

wherein said original reference voltage generating circuit includes a plurality of digital-to-analog converter circuits for generating said original reference voltages by generating a plurality of candidate voltages for said original reference voltages by voltage divider circuits for generating the original reference voltages and selecting and outputting the candidate voltages according to said original reference voltage setting data; and

a first digital-to-analog converter circuit of said plurality of digital-to-analog converter circuits divides a reference voltage generating voltage by a voltage divider circuit for generating said original reference voltage, and outputs a first original reference voltage of said plurality of original reference voltages;

a second digital-to-analog converter circuit of said plurality of digital-to-analog converter circuits divides said reference voltage generating voltage by a voltage divider circuit for generating said original reference voltage, and outputs a second original reference voltage of said plurality of original reference voltages; and

voltage divider circuits for generating said original reference voltages of the other digital-to-analog converter circuits of said plurality of digital-to-analog converter circuits are connected in series with each other, and said first original reference voltage and said second original reference voltage are input to both ends, respectively, of the other digital-to-analog converter circuits.

2. A driving circuit of a flat display device as claimed in claim 1 ,

wherein said original reference voltage generating circuit, said reference voltage generating circuit, said selecting circuits, and said input circuit are formed integrally with each other in an integrated circuit.

3. A driving circuit of a flat display device as claimed in claim 1 ,

wherein image data for said pixels of each color is time-division-multiplexed and input such that image data for said pixels of a same said color is contiguous in a line unit; and

said original reference voltage generating circuit changes said original reference voltages so as to correspond to the changing of color of said time-division-multiplexed and input said image data.

4. A flat display device for displaying an image on a basis of image data, said flat display device comprising:

a display unit formed by arranging pixels in a form of a matrix; and

a horizontal driving circuit for driving signal lines of said display unit by driving signals;

wherein said horizontal driving circuit includes:

an original reference voltage generating circuit for generating a plurality of original reference voltages;

a reference voltage generating circuit formed by connecting a plurality of voltage divider circuits in series with each other, said voltage divider circuits each being formed by connecting a plurality of resistances in series with each other, said original reference voltages being inputted to both ends of said voltage divider circuits and between said voltage divider circuits, respectively, said reference voltage generating circuit outputting a plurality of reference voltages as voltages divided by said plurality of voltage divider circuits; and

a plurality of selecting circuits for outputting said driving signals by receiving said plurality of reference voltages and selecting and outputting the reference voltages according to said image data for corresponding signal lines, and

wherein said original reference voltage generating circuit includes a plurality of digital-to-analog converter circuits for generating said original reference voltages by generating a plurality of candidate voltages for said original reference voltages by voltage divider circuits for generating the original reference voltages and selecting and outputting the candidate voltages according to original reference voltage setting data,

a first digital-to-analog converter circuit of said plurality of digital-to-analog converter circuits dividing a reference voltage generating voltage by a voltage divider circuit for generating said original reference voltage, and outputting a first original reference voltage,

a second digital-to-analog converter circuit of said plurality of digital-to-analog converter circuits dividing said reference voltage generating voltage by a voltage divider circuit for generating said original reference voltage, and outputting a second original reference voltage,

voltage divider circuits for generating said original reference voltages of the other digital-to-analog converter circuits of said plurality of digital-to-analog converter circuits being connected in series with each other, and said first original reference voltage and said second original reference voltage being input to both ends, respectively, of the other digital-to-analog converter circuits.

5. A flat display device as claimed in claim 4 , further comprising:

a time-division-multiplexing circuit for time-division-multiplexing image data for said pixels of each color such that image data for said pixels of a same said color is contiguous in a line unit, and inputting the time-division-multiplexed image data to said horizontal driving circuit; and

a data changing circuit for changing said original reference voltage setting data so as to correspond to the changing of color of said time-division-multiplexed image data;

wherein said horizontal driving circuit further includes a selecting circuit for changing the output of said driving signals so as to correspond to the changing of the color of said image data.

6. A flat display device as claimed in claim 5 ,

wherein said data changing circuit generates said original reference voltage setting data by correcting said original reference voltage setting data by correction data for correcting a change in said display unit with the passage of time.