DA conversion circuit, electro-optical device and electronic apparatus

Patent metadata

Field	Value
Publication number	US-11776487-B2
Application number	US-202217981116-A
Country	US
Kind code	B2
Filing date	Nov 4, 2022
Priority date	Jun 24, 2021
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A first capacitance element provided corresponding to a bit D 0 , a second capacitance element provided corresponding to a bit D 1 , and a third capacitance element and a fourth capacitance element provided corresponding to a bit D 2 , and electrically coupled in parallel are included. An area S 1 where electrodes of the first capacitance element overlap in plan view is smaller than half an area S 2 where electrodes of the second capacitance element overlap in plan view, an area in which electrodes of the third capacitance element overlap in plan view is substantially the same as the area S 2 , and an area where electrodes of the fourth capacitance element overlap in plan view is substantially the same as the area S 2.

First claim

What is claimed is:

1. An electro-optical device, comprising:
a DA conversion circuit including a capacitance element unit including:
a first capacitance element corresponding to a first bit and including a first electrode and a second electrode;
a second capacitance element corresponding to a second bit having a greater weight than that of the first bit, the second capacitance element including a third electrode and a fourth electrode; and
a third capacitance element and a fourth capacitance element, corresponding to a third bit having a greater weight than that of the second bit, and electrically coupled in parallel, the third capacitance element including a fifth electrode and a sixth electrode, the fourth capacitance element including a seventh electrode and an eighth electrode;

a data line;
an electro-optical element; and
a transistor corresponding to the electro-optical element and electrically connected to DA conversion circuit via the data line, wherein
a first area in which the first electrode and the second electrode overlap in plan view is less than half a second area in which the third electrode and the fourth electrode overlap in the plan view,
an area in which the fifth electrode and the sixth electrode overlap in the plan view is substantially the same as the second area, and
an area in which the seventh electrode and the eighth electrode overlap in the plan view is substantially the same as the second area.

2. An electro-optical device, comprising:
a first conversion circuit unit corresponding to higher bits of a plurality of bits, the first conversion circuit including:
a fifth capacitance element corresponding to a fourth bit of the higher bits and including a ninth electrode and a tenth electrode;
a sixth capacitance element corresponding to a fifth bit having a greater weight than that of the fourth bit, the sixth capacitance element including an eleventh electrode and a twelfth electrode; and
a seventh capacitance element and an eighth capacitance element, corresponding to a sixth bit having a greater weight than that of the fifth bit, end electrically coupled in parallel, the seventh capacitance element including a thirteenth electrode and a fourteenth electrode, the eighth capacitance element including a fifteenth electrode and a sixteenth electrode;

a second conversion circuit unit corresponding to lower bits, the second conversion circuit including:
first capacitance element corresponding to a first bit and including a first electrode and a second electrode,
a second capacitance element corresponding to a second bit having a greater weight than that of the first bit, the second capacitance element including a third electrode and a fourth electrode; and
a third capacitance element and a fourth capacitance element, corresponding to a third bit having a greater weight than that of the second bit, and electrically coupled in parallel, the third capacitance element including a fifth electrode and a sixth electrode, the fourth capacitance element including a seventh electrode and an eighth electrode;

a coupling capacitance between the first conversion circuit unit and the second conversion circuit unit;
a data line;
an electro-optical element; and
a transistor corresponding to the electro-optical element and electrically connected to the first conversion circuit unit via the data line, wherein
a first area in which the first electrode and the second electrode overlap in plan view is less than half a second area in which the third electrode and the fourth electrode overlap in the plan view,
an area in which the fifth electrode and the sixth electrode overlap in the plan view is substantially the same as the second area, and
an area in which the seventh electrode and the eighth electrode overlap in the plan view is substantially the same as the second area,
an area in which the ninth electrode and the tenth electrode overlap in the plan view is substantially the same as the first area,
an area in which the eleventh electrode and the twelfth electrode overlap in the plan view is substantially the same as the second area,
an area in which the thirteenth electrode and the fourteenth electrode overlap in the plan view is substantially the same as the second area, and
an area in which the fifteenth electrode and the sixteenth electrode overlap in the plan view is substantially the same as the second area.

3. The electro-optical device according to claim 2 , wherein
the coupling capacitance includes a seventeenth electrode and an eighteenth electrode, and
an area in which the seventeenth electrode and the eighteenth electrode overlap in the plan view is greater than the first area.

4. The electro-optical device according to claim 1 , wherein
each of the fifth electrode and the seventh electrode has an island shape, and
each of the sixth electrode and the eighth electrode has an island shape.

5. The electro-optical device according to claim 1 , wherein
each of the fifth electrode and the seventh electrode is an individual electrode with an island shape, and
the sixth electrode and the eighth electrode are common electrodes.

6. The electro-optical device according to claim 2 , wherein
each of the fifth electrode and the seventh electrode is an individual electrode with an island shape, and
the sixth electrode and the eighth electrode are common electrodes.

7. The electro-optical device according to claim 3 , wherein
each of the fifth electrode and the seventh electrode is an individual electrode with an island shape, and
the sixth electrode and the eighth electrode are common electrodes.

8. An electro-optical device, comprising:
a DA conversion circuit including a capacitance element unit including:
a first capacitance element corresponding to one bit of a plurality of bits; and
two second capacitance elements corresponding to another bit having a greater weight than that of the one bit, of the plurality of bits;

a data line;
an electro-optical element; and
a transistor corresponding to the electro-optical element and electrically connected to the DA conversion circuit via the data line, wherein
an area in which one electrode and another electrode of the first capacitance element overlap in plan view is substantially the same as an area in which one electrode and another electrode of each of the two second capacitance elements overlap in the plan view, and
the one electrode of each of the two second capacitance elements has an island shape, and the other electrode of each of the two second capacitance elements is a common electrode.

9. An electronic apparatus comprising the electro-optical device according to claim 1 .

10. An electronic apparatus comprising the electro-optical device according to claim 2 .

11. An electronic apparatus comprising the electro-optical device according to claim 8 .

12. The electro-optical device according to claim 1 , wherein
the data line extends along a first direction, and
the first capacitance element, the second capacitance element, the third capacitance element, and the fourth capacitance element are arranged along the first direction in the plan view.

13. The electro-optical device according to claim 2 , wherein
the data line extends along a first direction,
the first capacitance element, the second capacitance element, the third capacitance element, and the fourth capacitance element are arranged along the first direction in the plan view, and
the fifth capacitance element, the sixth capacitance element, the seventh capacitance element, and the eighth capacitance element are arranged along the first direction in the plan view.

Assignees

• Seiko Epson Corp

Inventors

• Ota Hitoshi

Classifications

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2300/0828

  forming a digital to analog [D/A] conversion circuit · CPC title

• G09G2300/0876

  Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title