Current-driven active matrix display panel for improved pixel programming
First Claim
1. A display device comprising:
- a data line driver;
a scan line driver; and
a display panel including a plurality of drive legs between a current output node and a first node having a fixed potential, each of said drive legs comprising;
a drive transistor having a source connected to said first node, a capacitor connected between a gate of said drive transistor and a second node having a fixed potential, a first switch connected between said current output node and a drain of said drive transistor, and a second switch connected between said gate and said drain of said drive transistor, wherein said display panel further includes;
a data line, a third switch connected between said current output node and said data line, a current-driven element, and a fourth switch connected between said current output node and said current-driven element, wherein, during a programming period, said scan line driver turns on said first to third switches with-said fourth switch turned off, and said data line driver develops a programming current through said data line, and wherein, during a driving period following said programming period, said scan line driver turns on said fourth switch with said second and third switches turned off, and sequentially turns on said first switches of said drive legs.
1 Assignment
0 Petitions
Accused Products
Abstract
A display device is comprised of a data line driver, a scan line driver, and a display panel. The display panel is composed of a plurality of drive legs disposed between a current output node and a first node having a fixed potential, each of the drive legs including a drive transistor having a source connected to the first node, a capacitor connected between a gate of the drive transistor and a second node having a fixed potential, a first switch connected between the current output node and a drain of the drive transistor, and a second switch connected between the gate and the drain of the drive transistor. The display panel further includes a data line, a third switch connected between the current output node and the data line, a current-driven element, a fourth switch connected between the current output node and the current-driven element.
-
Citations
57 Claims
-
1. A display device comprising:
-
a data line driver;
a scan line driver; and
a display panel including a plurality of drive legs between a current output node and a first node having a fixed potential, each of said drive legs comprising;
a drive transistor having a source connected to said first node, a capacitor connected between a gate of said drive transistor and a second node having a fixed potential, a first switch connected between said current output node and a drain of said drive transistor, and a second switch connected between said gate and said drain of said drive transistor, wherein said display panel further includes;
a data line, a third switch connected between said current output node and said data line, a current-driven element, and a fourth switch connected between said current output node and said current-driven element, wherein, during a programming period, said scan line driver turns on said first to third switches with-said fourth switch turned off, and said data line driver develops a programming current through said data line, and wherein, during a driving period following said programming period, said scan line driver turns on said fourth switch with said second and third switches turned off, and sequentially turns on said first switches of said drive legs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A display device comprising:
-
a data line driver;
a scan line driver; and
a display panel, wherein said display panel includes a plurality of drive legs connected between a current output node and a first node having a fixed potential, each of said drive legs including;
a drive transistor having a source connected to said first node, and a first switch connected between said current output node and a drain of said drive transistor, wherein gates of said drive transistors of said drive legs are commonly coupled together, wherein said display panel further includes;
a capacitor connected between said commonly coupled gates and a second node having a fixed potential, a current-driven element connected to said current output node, a data line, and a third switch connected between said data line and said drains of said drive transistors of said drive legs, wherein, during a programming period, said scan line driver turns on said first and third switches, and said data line driver provides a programming current through said data line to develop currents through said drive transistors of said drive legs, and wherein, during a driving period following said programming period, said scan line driver sequentially turns on said first switches of said drive legs with said third switch turned off. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A display device comprising:
-
a data line driver;
a scan line driver; and
a display panel, wherein said display panel includes a plurality of drive legs connected between a current output node and a first node having a fixed potential, each of said drive legs including;
a drive transistor having a source connected to said first node, and a first switch connected between said current output node and a drain of said drive transistor, wherein gates of said drive transistors of said drive legs are commonly coupled together, wherein said display panel further includes;
a capacitor connected between said commonly coupled gates and a second node having a fixed potential, a programming transistor having a gate connected to said commonly coupled gates, and a source connected to said first node, a current-driven element connected to said current output node, a data line, and a third switch connected between said data line and said drain of said programming transistor, wherein, during a programming period, said scan line driver turns on said first and third switches, and said data line driver provides a programming current for said programming transistor through said data line, and wherein, during a driving period following said programming period, said scan line driver sequentially turns on said first switches of said drive legs with said third switch turned off. - View Dependent Claims (22, 23, 24)
-
-
25. A display panel comprising:
-
a plurality of drive legs between a current output node and a first node having a fixed potential, each of said drive legs including;
a drive transistor having a source connected to said first node, a capacitor connected between a gate of said drive transistor and a second node having a fixed potential, a first switch connected between said current output node and a drain of said drive transistor, and a second switch connected between said gate and said drain of said drive transistor;
a data line;
a third switch connected between said current output node and said data line;
a current-driven element;
a fourth switch connected between said current output node and said current-driven element. - View Dependent Claims (26, 27, 28, 29, 30)
-
-
31. A display panel comprising:
-
a plurality of drive legs connected between a current output node and a first node having a fixed potential, each of said drive legs including;
a drive transistor having a source connected to said first node with gates of said drive transistors of said drive legs commonly coupled together, and a first switch connected between said current output node and a drain of said drive transistor;
a capacitor connected between said commonly coupled gates and a second node having a fixed potential;
a current-driven element connected to said current output node;
a data line;
a third switch connected between said data line and said drains of said drive transistors of said drive legs. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
-
-
39. A display panel comprising:
-
a plurality of drive legs connected between a current output node and a first node having a fixed potential, each of said drive legs including;
a drive transistor having a source connected to said first node, and a first switch connected between said current output node and a drain of said drive transistor, wherein gates of said drive transistors of said drive legs are commonly coupled together, a capacitor connected between said commonly coupled gates and a second node having a fixed potential, a programming transistor having a gate connected to said commonly coupled gates, and a source connected to said first node, a current-driven element connected to said current output node, a data line, a third switch connected between said data line and said drain of said programming transistor. - View Dependent Claims (40, 41, 42)
-
-
43. A method for driving a current-driven element comprising:
-
providing a programming current through a data line during a programming period;
delivering said programming current from said data line to a plurality of drive transistors during said programming period, each of said drive transistors having a gate connected to a capacitor, to thereby develop a voltage across said each capacitor;
sequentially selecting one of said plurality of drive transistors to provide a drive current for said current-drive element from said selected drive transistor with said voltage maintained across said each capacitor, during a driving period following said programming period. - View Dependent Claims (44, 45, 46, 47)
-
-
48. A method for driving a current-driven element comprising:
-
providing a programming current through a data line during a programming period;
delivering said programming current from said data line to a plurality of drive transistors having commonly coupled gates connected to a capacitor during said programming period, to thereby develop a voltage across said capacitor;
sequentially selecting one of said plurality of drive transistors to provide a drive current for said current-drive element from said selected drive transistor with said voltage maintained across said capacitor, during a driving period following said programming period. - View Dependent Claims (49, 50, 51, 52)
-
-
53. A circuit comprising:
-
a light emitting element; and
a pixel circuit for applying a current to said light emitting element, said pixel circuit including;
a plurality of current sources each producing a current, and a switch sequentially applying a corresponding current of said current sources to said light emitting element during one frame period. - View Dependent Claims (54, 55, 56)
-
-
57. A circuit comprising:
-
a current driven element; and
a driver sequentially supplying a current to said current driven element during a predetermined frame period.
-
Specification