Display device and pixel circuit layout method

Abstract

The present invention provides a display device including a pixel array unit, a first power supply line, and a second power supply line. The pixel array unit is formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving the electrooptic element in a form of a matrix. The first power supply line is for supplying a first power supply potential to the pixel circuits. The first power supply line is arranged along a direction of pixel arrangement of a pixel column in the pixel array unit. The second power supply line is for supplying a second power supply potential to the pixel circuits. The second power supply line isw arranged along the direction of the pixel arrangement of the pixel column in the pixel array unit.

What is claimed is: 
     
       1. A display device comprising:
 a pixel array unit formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving said electrooptic element in a form of a matrix; 
 a first power supply line for supplying a first power supply potential to said pixel circuits, said first power supply line being arranged along a direction of pixel arrangement of a pixel column in said pixel array unit; and 
 a second power supply line for supplying a second power supply potential to said pixel circuits, said second power supply line being arranged along the direction of the pixel arrangement of the pixel column in said pixel array unit; 
 wherein two pixel circuits adjacent to each other in said pixel array unit are set as a pair, 
 said two pixel circuits are formed such that layout configurations of said electrooptic elements and said driving circuits are symmetrical with respect to a direction in which said first power supply line and said second power supply line are formed as an axis of symmetry, and 
 said first power supply line and said second power supply line are routed to said two pixel circuits such that wiring patterns of said first power supply line and said second power supply line are symmetrical with respect to said axis of symmetry. 
 
     
     
       2. The display device according to  claim 1 ,
 wherein an arrangement of said pixel circuits is a stripe arrangement, 
 said two pixel circuits are horizontally adjacent to each other in a same pixel row in said pixel array unit, 
 said first power supply line is routed to one of said two pixel circuits, and 
 said second power supply line is routed to the other of said two pixel circuits. 
 
     
     
       3. The display device according to  claim 1 ,
 wherein an arrangement of said pixel circuits is a delta arrangement, 
 said two pixel circuits are obliquely adjacent to each other in two adjacent pixel rows in said pixel array unit, and 
 said first power supply line and said second power supply line are routed to both said two pixel circuits such that wiring patterns of said first power supply line and said second power supply line are symmetrical with respect to said axis of symmetry. 
 
     
     
       4. The display device according to  claim 1 ,
 wherein said pixel circuits each including 
 a first switching transistor connected between a source of a driving transistor and the first power supply potential, 
 a second switching transistor connected between a gate of said driving transistor and the second power supply potential, and 
 a capacitor connected between the gate and the source of said driving transistor, and 
 said first power supply line and said second power supply line are power supply lines for supplying said first power supply potential and said second power supply potential to said pixel circuits. 
 
     
     
       5. The display device according to  claim 1 ,
 wherein each of said pixel circuits has a pixel capacitance, one terminal of said pixel capacitance being connected to a part of a signal line within the pixel circuit, and 
 each terminal of said pixel capacitances in said two pixel circuits is connected to said first power supply line and said second power supply line. 
 
     
     
       6. The display device according to  claim 5 ,
 wherein an arrangement of said pixel circuits is a stripe arrangement, 
 said two pixel circuits are horizontally adjacent to each other in a same pixel row in said pixel array unit, 
 said first power supply line is routed to one of said two pixel circuits, and 
 said second power supply line is routed to the other of said two pixel circuits. 
 
     
     
       7. The display device according to  claim 5 ,
 wherein an arrangement of said pixel circuits is a delta arrangement, 
 said two pixel circuits are obliquely adjacent to each other in two adjacent pixel rows in said pixel array unit, and 
 said first power supply line and said second power supply line are routed to both said two pixel circuits such that wiring patterns of said first power supply line and said second power supply line are symmetrical with respect to said axis of symmetry. 
 
     
     
       8. A layout method for pixel circuits in a display device, said display device comprising:
 a pixel array unit formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving said electrooptic element in a form of a matrix; 
 a first power supply line for supplying a first power supply potential to said pixel circuits, said first power supply line being arranged along a direction of pixel arrangement of a pixel column in said pixel array unit; and 
 a second power supply line for supplying a second power supply potential to said pixel circuits, said second power supply line being arranged along the direction of the pixel arrangement of the pixel column in said pixel array unit; 
 wherein two pixel circuits adjacent to each other in said pixel array unit are set as a pair, 
 said two pixel circuits are formed such that layout configurations of said electrooptic elements and said driving circuits are symmetrical with respect to a direction in which said first power supply line and said second power supply line are formed as an axis of symmetry, and 
 said first power supply line and said second power supply line are routed to said two pixel circuits such that wiring patterns of said first power supply line and said second power supply line are symmetrical with respect to said axis of symmetry. 
 
     
     
       9. A display device comprising:
 a pixel array unit formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving said electrooptic element in a form of a matrix; 
 a first power supply line for supplying a first power supply potential to said pixel circuits, said first power supply line being arranged along a direction of pixel arrangement of a pixel column in said pixel array unit; and 
 a second power supply line for supplying a second power supply potential to said pixel circuits, said second power supply line being arranged along the direction of the pixel arrangement of the pixel column in said pixel array unit; 
 wherein two pixel circuits adjacent to each other in said pixel array unit are set as a pair, and 
 said two pixel circuits are formed such that layout configurations of said electrooptic elements and said driving circuits are symmetrical with respect to a direction in which said first power supply line and said second power supply line are formed as an axis of symmetry. 
 
     
     
       10. A display device comprising:
 a pixel array unit formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving said electrooptic element in a form of a matrix;   a first power supply line for supplying a first power supply potential to said pixel circuits, said first power supply line being arranged along a direction of pixel arrangement of a pixel column in said pixel array unit; and   a second power supply line for supplying a second power supply potential to said pixel circuits, said second power supply line being arranged along the direction of the pixel arrangement of the pixel column in said pixel array unit;   wherein two pixel circuits adjacent to each other in said pixel array unit are set as a pair, and said two pixel circuits are formed such that layout configurations of said driving circuits are symmetrical with respect to a direction in which said first power supply line is formed as an axis of symmetry.   
     
     
       11. The display device according to claim 10, wherein said two pixel circuits are formed such that layout configurations of said driving circuits are symmetrical with respect to a direction in which said first power supply line and said second power supply line are is formed as an axis of symmetry. 
     
     
       12. A display device comprising:
 a pixel array unit formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving said electrooptic element in a form of a matrix;   a first power supply line for supplying a first power supply potential to said pixel circuits, said first power supply line being arranged along a direction of pixel arrangement of a pixel column in said pixel array unit; and   a second power supply line for supplying a second power supply potential to said pixel circuits, said second power supply line being arranged along the direction of the pixel arrangement of the pixel column in said pixel array unit;   wherein two pixel circuits adjacent to each other in said pixel array unit are set as a pair, and said two pixel circuits are formed such that layout configurations of said driving circuits are symmetrical with respect to a direction,   the pixel circuit comprising a drive transistor for supplying a current to said electrooptic element,   the first power supply potential is supplied to a source electrode of the drive transistor via a first switching transistor, and   the second power supply potential is supplied to a gate electrode of the drive transistor via a second switching transistor.   
     
     
       13. A display device comprising:
 a pixel array unit formed by two-dimensionally arranging pixel circuits each including an electrooptic element determining display luminance and a driving circuit for driving said electrooptic element in a form of a matrix;   a first power supply line for supplying a first power supply potential to said pixel circuits, said first power supply line being arranged along a direction of pixel arrangement of a pixel column in said pixel array unit; and   a second power supply line for supplying a second power supply potential to said pixel circuits, said second power supply line being arranged along the direction of the pixel arrangement of the pixel column in said pixel array unit;   wherein two pixel circuits adjacent to each other in said pixel array unit are set as a pair, and said two pixel circuits are formed such that layout configurations of said driving circuits are symmetrical with respect to a direction,   wherein a first part of said second power supply line is positioned on a first side of said first power supply line, and   wherein a second part of said second power supply line is positioned on a second side of said first power supply line.   
     
     
       14. The display device according to claim 13, wherein said first part of said second power supply line and said second part of said second power supply line are connected via a wiring portion. 
     
     
       15. The display device according to claim 14, wherein said first part of said second power supply line and said second part of said second power supply line are formed on a same layer. 
     
     
       16. The display device according to claim 15, wherein said first part of said second power supply line and said second part of said second power supply line are made of same material. 
     
     
       17. The display device according to claim 16, wherein said wiring portion is arranged along a direction of pixel arrangement of a pixel row in said pixel array unit and across over said first power supply line. 
     
     
       18. The display device according to claim 17, wherein said wiring portion is made of different material from said second power supply line. 
     
     
       19. The display device according to claim 16, wherein said first part of said second power supply line and said second part of said second power supply line are alternatively disposed along the direction of pixel arrangement of the pixel column.