Display device employing time-division-multiplexed driving of driver circuits
View Patent ↗A display device includes a display panel having plural pixels each provided with a thin film transistor and arranged in a matrix configuration in its display area, and a drain driver for supplying video signals to the plural pixels. The drain driver supplies video signals to the plural pixels in a time-division-multiplex fashion based upon the kind of the video signals to be displayed, or based upon the location of plural display blocks forming the display area.
1. A display device comprising:
a first display block having n red-associated drain lines, n green-associated drain lines and n blue-associated drain lines, arranged adjacently to each other, n being a natural number equal to or greater than 2;
a second display block having n red-associated drain lines, n green-associated drain lines and n blue-associated drain lines, arranged adjacently to each other, n being a natural number equal to or greater than 2;
a plurality of scanning lines common to said first and second display blocks and intersecting said red-associated, green-associated, and blue-associated drain lines of said first and second display blocks;
a plurality of pixels disposed in vicinities of intersections of said plurality of scanning lines and said red-associated, green-associated, and blue-associated drain lines of said first and second display blocks,
a respective one of said plurality of pixels being provided with a thin film transistor having a first terminal thereof coupled to a corresponding one of said red-associated, green-associated, and blue-associated drain lines of said first and second display blocks, a second terminal of said thin film transistor coupled to a corresponding one of said plurality of scanning lines, and a third terminal of said thin film transistor coupled to a pixel electrode of said respective one of said plurality of pixels;
3n drain bus conductors, each of said 3n drain bus conductors being coupled to a corresponding one of said red-associated, green-associated, and blue-associated drain lines of said first display block simultaneously in a first timing via a first switching circuit controlled by a first control signal, and each of said 3n drain bus conductors being coupled to a corresponding one of said red-associated, green-associated, and blue-associated drain lines of said second display block simultaneously in a second timing different from said first timing via a second switching circuit controlled by a second control signal,
3n digital-to-analog converters disposed from said first and second display blocks with said 3n drain bus conductors arranged in-between, each of said 3n digital-to-analog converters being coupled to a respective one of said 3n drain bus conductors;
a latch circuit coupled to said 3n digital-to-analog converters; and
a delay device coupled to said latch circuit,
wherein said delay device comprises
input terminals for receiving digital video data,
a third switching circuit having first terminals coupled to said input terminals,
a delay circuit which is coupled to said input terminals and delays red-associated, green-associated, and blue-associated digital video data contained in said digital video data supplied from said input terminals,
a fourth switching circuit having first terminals coupled to output terminals of said delay circuit, and
output terminals coupled to second terminals of said third switching circuit and second terminals of said fourth switching circuit; and
wherein said third switching circuit outputs video data corresponding to said plurality of pixels in one of said first and second display blocks, and
said fourth switching circuit outputs video data corresponding to said plurality of pixels in another of said first and second display blocks.
2. A display device according to claim 1 , wherein
said first switching circuit and said second switching circuit are polysilicon thin film transistors.
3. A display device according to claim 1 , wherein said delay device is fabricated on a single semiconductor chip.
4. A display device according to claim 1 , wherein said delay device, said latch circuit, and said n digital-to-analog converters are fabricated on a single semiconductor chip.
5. A display device according to claim 1 , wherein m drain lines among said n drain lines of said first and second display blocks, respectively, and pixels among said plurality of pixels associated with said m drain lines are common to said first and second display blocks.