Display device, driving method of the same and electronic equipment incorporating the same
View Patent ↗Disclosed herein is a display device including: a pixel section having pixel circuits arranged to form a matrix with at least a plurality of columns, pixel data being written to each of the pixel circuits via a switching element; at least one scan line disposed to be associated with rows of the pixel circuits and adapted to control the conduction of the switching elements; a plurality of signal lines disposed to be associated with columns of the pixel circuits and adapted to convey the pixel data; and a horizontal driving circuit having a plurality of signal drivers, the plurality of signal drivers being associated with a plurality of groups into which the signal lines are divided, and being adapted to convey the image data supplied to the signal lines.
1. A display device comprising:
a pixel section having pixel circuits arranged to form a matrix with at least a plurality of columns, pixel data being written to each of the pixel circuits via a switching element;
at least one scan line disposed to be associated with rows of the pixel circuits and configured to control the conduction of the switching elements;
a plurality of signal lines disposed to be associated with columns of the pixel circuits and configured to convey the pixel data;
a horizontal driving circuit having a plurality of signal drivers, the plurality of signal drivers being associated with a plurality of groups into which the signal lines are divided, and being configured to convey image data supplied to the signal lines, wherein
each of the plurality of signal drivers conveys the image data to the associated signal line in response to a separate drive pulse, and
the drive pulses supplied to the signal drivers are shifted in phase from each other;
a multiphase clock data generator that includes a plurality of counter flip-flops configured to receive trigger points signals shifted in phase from a timing controller in order to divide in frequency the drive pulse at a higher-than-normal frequency so as to supply the drive pulses shifted in phase from each other to the signal drivers; and
said multiphase clock data generator being configured to divide the image data and to rearrange the divided pieces of data into a data arrangement suitable for input to the signal drivers.
2. The display device of claim 1 , wherein
data is fed in a divided manner to the signal drivers adjacent to each other, and
the image data is fed to the signal drivers at timings synchronous with the drive pulses.
3. The display device of claim 1 , wherein
the multiphase clock data generator supplies the independent drive pulses, shifted in phase from each other, respectively to the signal drivers, and
the drive pulses each include a clock pulse and start pulse.
4. The display device of claim 2 , wherein
the multiphase clock data generator supplies the independent drive pulses, shifted in phase from each other, respectively to the signal drivers, and
the drive pulses each include a clock pulse and start pulse.
5. The display device of claim 2 , wherein
a time interval Φ by which the drive pulses are shifted in phase from each other is set so as to satisfy the relationship Φ≦(T/2)/N, where (T/2) is the half period of an image clock and N the number of frequency divisions.
6. The display device of claim 4 , wherein
a time interval Φ by which the drive pulses are shifted in phase from each other is set so as to satisfy the relationship Φ≦(T/2)/N, where (T/2) is the half period of an image clock and N the number of frequency divisions.
7. The display device of any one of claims 1 comprising:
a selector switch disposed between each of the signal drivers and its associated signal line, the selector switch configured to select the image data in a time-divided manner.
8. A driving method of a display device comprising the steps of:
disposing a pixel section having pixel circuits arranged to form a matrix with at least a plurality of columns, pixel data being written to each of the pixel circuits via a switching element;
disposing at least one scan line to be associated with rows of the pixel circuits and configured to control the conduction of the switching elements;
disposing a plurality of signal lines to be associated with columns of the pixel circuits and configured to convey the pixel data;
disposing a horizontal driving circuit having a plurality of signal drivers, the plurality of signal drivers associated with a plurality of groups into which the signal lines are divided, and configured to convey the image data supplied to the signal lines;
supplying the independent drive pulses, shifted in phase from each other, respectively to the signal drivers;
causing each of the signal drivers to convey the image data to the associated signal line in response to the drive pulse received;
generating multiphase clock data by including a plurality of counter flip-flops that receive trigger points signals shifted in phase from a timing controller in order to divide in frequency the drive pulse at a higher-than-normal frequency so as to supply the drive pulses shifted in phase from each other to the signal drivers; and
generating multiphase clock data by dividing the image data and rearranging the divided pieces of data into a data arrangement suitable for input to the signal drivers.
9. Electronic equipment having a display device, the display device comprising:
a pixel section having pixel circuits arranged to form a matrix with at least a plurality of columns, pixel data being written to each of the pixel circuits via a switching element;
at least one scan line disposed to be associated with rows of the pixel circuits and configured to control the conduction of the switching elements;
a plurality of signal lines disposed to be associated with columns of the pixel circuits and configured to convey the pixel data; and
a horizontal driving circuit having a plurality of signal drivers, the plurality of signal drivers being associated with a plurality of groups into which the signal lines are divided, and being configured to convey image data supplied to the signal lines, wherein
each of the plurality of signal drivers conveys the image data to the associated signal line in response to a separate drive pulse, and
the drive pulses supplied to the signal drivers are shifted in phase from each other;
a multiphase clock data generator that includes a plurality of counter flip-flops configured to receive trigger points signals shifted in phase from a timing controller in order to divide in frequency the drive pulse at a higher-than-normal frequency so as to supply the drive pulses shifted in phase from each other to the signal drivers; and
said multiphase clock data generator being configured to divide the image data and to rearrange the divided pieces of data into a data arrangement suitable for input to the signal drivers.