DA conversion circuit, electro-optical device and electronic apparatus

Patent metadata

Field	Value
Publication number	US-11776486-B2
Application number	US-202217847576-A
Country	US
Kind code	B2
Filing date	Jun 23, 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 D0, a second capacitance element provided corresponding to a bit D1, and a third capacitance element and a fourth capacitance element provided corresponding to a bit D2, and electrically coupled in parallel are included. An area S1 where electrodes of the first capacitance element overlap in plan view is smaller than half an area S2 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 S2, and an area where electrodes of the fourth capacitance element overlap in plan view is substantially the same as the area S2.

First claim

What is claimed is:

1. A DA conversion circuit, comprising:
a capacitance element unit including a capacitance element having a capacitance value corresponding to a weight of each bit, wherein
the capacitance element unit includes
a first capacitance element provided corresponding to a first bit,
a second capacitance element provided corresponding to a second bit having a greater weight than that of the first bit, and
a third capacitance element and a fourth capacitance element, provided corresponding to a third bit having a greater weight than that of the second bit, and electrically coupled in parallel,
the first capacitance element includes a first electrode and a second electrode,
the second capacitance element includes a third electrode and a fourth electrode,
the third capacitance element includes a fifth electrode and a sixth electrode,
the fourth capacitance element includes a seventh electrode and an eighth electrode,
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 plan view,
an area in which the fifth electrode and the sixth electrode overlap in plan view is substantially the same as the second area, and
an area in which the seventh electrode and the eighth electrode overlap in plan view is substantially the same as the second area.

2. A DA conversion circuit, comprising:
a first conversion circuit unit corresponding to higher bits of a plurality of bits;
a second conversion circuit unit corresponding to lower bits; and
a coupling capacitance provided between the first conversion circuit unit and the second conversion circuit unit, the second conversion circuit unit being the DA conversion circuit according to claim 1 , wherein
the first conversion circuit unit includes
a fifth capacitance element provided corresponding to a fourth bit of the higher bits,
a sixth capacitance element provided corresponding to a fifth bit having a greater weight than that of the fourth bit, and
a seventh capacitance element and an eighth capacitance element, provided corresponding to a sixth bit having a greater weight than that of the fifth bit, and electrically coupled in parallel,
the fifth capacitance element includes a ninth electrode and a tenth electrode,
the sixth capacitance element includes an eleventh electrode and a twelfth electrode,
the seventh capacitance element includes a thirteenth electrode and a fourteenth electrode,
the eighth capacitance element includes a fifteenth electrode and a sixteenth electrode,
an area in which the ninth electrode and the tenth electrode overlap in plan view is substantially the same as the first area,
an area in which the eleventh electrode and the twelfth electrode overlap in plan view is substantially the same as the second area,
an area in which the thirteenth electrode and the fourteenth electrode overlap in plan view is substantially the same as the second area, and
an area in which the fifteenth electrode and the sixteenth electrode overlap in plan view is substantially the same as the second area.

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

4. The DA conversion circuit according to claim 1 , wherein
each of the fifth electrode and the seventh electrode is an electrode provided in an island shape, and
each of the sixth electrode and the eighth electrode is an electrode provided in an island shape.

5. The DA conversion circuit according to claim 1 , wherein
each of the fifth electrode and the seventh electrode is an individual electrode provided in an island shape, and
the sixth electrode and the eighth electrode are common electrodes.

6. The DA conversion circuit according to claim 2 , wherein
each of the fifth electrode and the seventh electrode is an individual electrode provided in an island shape, and
the sixth electrode and the eighth electrode are common electrodes.

7. The DA conversion circuit according to claim 3 , wherein
each of the fifth electrode and the seventh electrode is an individual electrode provided in an island shape, and
the sixth electrode and the eighth electrode are common electrodes.

8. A DA conversion circuit, comprising:
a capacitance element unit including a capacitance element having a capacitance value corresponding to a weight of each bit, wherein
the capacitance element unit includes
a capacitance element provided corresponding to one bit of a plurality of bits, and
two capacitance elements provided corresponding to another bit having a greater weight than that of the one bit, of the plurality of bits,
an area in which one electrode and another electrode of the capacitance element in the capacitance element provided corresponding to the one bit overlap in plan view is substantially the same as an area in which one electrode and another electrode of each of the two capacitance elements overlap in plan view,
the one electrode of each of the two capacitance elements is provided in an island shape, and the other electrode of each of the two capacitance elements is a common electrode.

9. An electro-optical device, comprising:
an electro-optical element that is brought into an optical state based on a data signal, the data signal being converted from data of a plurality of bits by the DA conversion circuit according to claim 1 .

10. An electro-optical device, comprising:
an electro-optical element that is brought into an optical state based on a data signal, the data signal being converted from data of a plurality of bits by the DA conversion circuit according to claim 8 .

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

12. The DA conversion circuit according to claim 1 , wherein
the first bit is least significant bit, and
the second bit is next bit to the first bit.

13. An electronic apparatus comprising the DA conversion circuit according to claim 12 .

Assignees

• Seiko Epson Corp

Inventors

• Ota Hitoshi

Classifications

• G09G3/3291 Primary

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• 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