Display apparatus, pixel layout method for display apparatus, and electronic device
In a display apparatus, a plurality of pixels are disposed in an array. Each pixel includes: an electro-optical element; a write transistor that writes a picture signal; a drive transistor that drives the electro-optical element according to the picture signal written by the write transistor; a hold capacitor, connected between the gate and source electrodes of the drive transistor, that holds the picture signal written by the write transistor; and an auxiliary capacitor, connected between the anode of the electro-optical element and a fixed potential node. Each auxiliary capacitor is formed straddling the boundary between specific pixel pairs adjacent in the pixel layout direction on a pixel row. An island metal pattern is formed between pixel pairs other than the specific pixel pairs, at a site corresponding to that of the auxiliary capacitor.
1. A display apparatus, comprising:
a plurality of pixels disposed m an array, each pixel including an electro-optical element,
a write transistor configured to write a picture signal,
a drive transistor configured to drive the electro-optical element according to the picture signal written by the write transistor, and
a hold capacitor, connected between the gate and source electrodes of the drive transistor, and configured to hold the picture signal written by the write transistors;
wherein the plurality of pixels are all grouped into pairs, each pair comprising pixels adjacent to one another in the row direction,
each of said pairs has an auxiliary capacitor area that straddles a boundary between the pixels of the respective pair, respective layouts of the auxiliary capacitor areas being substantially the same as one another,
each pixel of a first subset of the plurality of pixels includes an auxiliary capacitor comprising a first electrode connected to the anode of the electro-optical element of the respective pixel and a second electrode connected to a first potential node, a region of overlap of the first and second electrodes defining the auxiliary capacitor, where a layout of the auxiliary capacitor corresponds to the auxiliary capacitor area of the pair that includes the respective pixels, and
each of the pairs that does not include a pixel of the first subset has an island metal pattern, which is not the auxiliary capacitor of any of the plurality of pixels, and whose layout corresponds to the auxiliary capacitor area of the respective pair.
2. The display apparatus according to claim 1 , wherein for each of said pairs, the pixels thereof have line-symmetric layouts about the boundary line between the pixels of the pair.
3. The display apparatus according to claim 1 , wherein
for each pixel of the first subset, the first potential node is a power supply line configured to supply a power supply potential to ones of the plurality of pixels, and
the island metal pattern is connected in parallel to portions of a corresponding one of the power supply line wirings.
4. The display apparatus according to claim 3 , wherein
each of the power supply lines controls light emission of ones of the electro-optical elements by selectively supplying a first power supply potential, or a second power supply potential lower than the first power supply potential, and
for each pixel of the first subset, the first potential node is the power supply line of the preceding pixel row.
5. The display apparatus according to claim 1 , wherein each pixel includes a function for a mobility correction process, which corrects mobility in the drive transistor by applying negative feedback to the potential difference between the gate and source of the drive transistor, with the magnitude of the correction varying in accordance with the current flowing into the drive transistor.
6. The display apparatus according to claim 5 , wherein the mobility correction process is conducted in parallel with the picture signal writing process conducted by the write transistor.
7. The display apparatus according to claim 1 , wherein the island metal pattern is a dummy pattern.
8. The display apparatus of claim 7 ,
wherein, for each of the pairs that does not include a pixel of the first subset, the island pattern is not directly conductively connected to an element belonging to the one of the pixels of the respective pair.
9. The display apparatus according to claim 1 , wherein for each pixel of the first subset, the first potential nodes is a cathode of the electro-optical element of the respective pixel.
10. The display apparatus according to claim 1 , wherein each pixel of the first subset is configured to emit blue light.
11. The display apparatus of claim 10 ,
wherein each the pairs that does not include a pixel of the first subset does not have a pixel configured to emit blue light.
12. The display apparatus according to claim 1 , wherein for each pixel of the first subset, the fixed potential node is connected to a drive line of a preceding pixel row in a scanning direction.
13. An electronic device comprising the display apparatus according to claim 1 .
14. The display apparatus of claim 1 ,
wherein for each of said pairs, the auxiliary capacity area is substantially symmetric about the boundary between the pixels of the respective pair.
15. A pixel layout method for a display apparatus having a plurality of pixels disposed in an array, each pixel including
an electro-optical element,
a write transistor configured to write a picture signal,
a drive transistor configured to drive the electro-optical element according to the picture signal written by the write transistor, and
a hold capacitor, connected between the gate and source electrodes of the drive transistor, and configured to hold the picture signal written by the write transistor,
wherein the plurality of pixels are all grouped into pairs, each pair comprising pixels adjacent to one another in the row direction,
each of said pairs has an auxiliary capacitor area that straddles a boundary between the pixels of the respective pair, respective layouts of the auxiliary capacitor areas being substantially the same as one another,
the method comprising the steps of:
forming in each pixel of a first subset of the plurality of pixels an auxiliary capacitor comprising a first electrode connected to the anode of the electro-optical element of the respective pixel and a second electrode connected to a first potential node, a region of overlap of the first and second electrodes defining the auxiliary capacitor, where a layout of the auxiliary capacitor corresponds to the auxiliary capacitor area of the pair that includes the respective pixel; and
forming in each of the pairs that does not include a pixel of the first subset an island metal pattern, which is not directly conductively connected to any electro-optical element and whose layout corresponds to the auxiliary capacitor area of the respective pair.
16. The pixel layout method according to claim 15 , wherein the island metal pattern is a dummy pattern.
17. The pixel layout method of claim 15 ,
wherein, for each of the pairs that does not include a pixel of the first subset, the island pattern is not directly conductively connected to an element belonging to the one of the pixels of the respective pair.