Electro-optical panel having a driver with variable driving capability

Patent metadata

Field	Value
Publication number	US-9792872-B2
Application number	US-201514953767-A
Country	US
Kind code	B2
Filing date	Nov 30, 2015
Priority date	Dec 5, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A driver and an electronic device include a capacitor driving circuit and a capacitor circuit having a plurality of capacitors provided between a plurality of capacitor driving nodes and a data voltage output terminal, and the capacitor driving circuit includes a plurality of driving units that output capacitor driving voltages. In the case where the capacitor that has the highest capacitance among the plurality of capacitors is driven, the driving unit that drives that highest capacitor is a driving unit whose driving capability is variable.

First claim

What is claimed is:

1. A driver comprising:
a capacitor driving circuit that outputs first to nth capacitor driving voltages (where n is a natural number of 2 or more) corresponding to tone data to first to nth capacitor driving nodes; and
a capacitor circuit including first to nth capacitors provided between the first to nth capacitor driving nodes and a data voltage output terminal,
wherein the capacitor driving circuit includes first to nth driving units that output the first to nth capacitor driving voltages; and
in the case where a capacitance of the nth capacitor is the highest among the first to nth capacitors, at least the nth driving unit of the first to nth driving units is a driving unit whose driving capability is variable, and
in the case where driving capabilities of the first to nth driving units are represented by D 1 to Dn and capacitances of the first to nth capacitors are represented by C 1 to Cn, the driving capability Dn of the nth driving unit is set so that Dn/Cn<D 1 /C 1 .

2. The driver according to claim 1 , further comprising:
a storage unit that stores a setting value for the driving capability of the driving unit whose driving capability is variable.

3. An electronic device comprising the driver according to claim 2 .

4. The driver according to claim 1 ,
wherein jth to nth driving units of the first to nth driving units (where j is a natural number of 1≦j≦n) are driving units whose driving capabilities are variable; and
first to j−1th driving units of the first to nth driving units are driving units whose driving capabilities are fixed.

5. The driver according to claim 4 ,
wherein in the case where driving capabilities of the first to nth driving units are represented by D 1 to Dn and capacitances of the first to nth capacitors are represented by C 1 to Cn, the driving capabilities of the jth to nth driving units are set so that Di/Ci<D 1 /C 1 (where i is a natural number of j≦i≦n).

6. An electronic device comprising the driver according to claim 5 .

7. The driver according to claim 4 , further comprising:
a storage unit that stores a setting value for the driving capability of the driving unit whose driving capability is variable.

8. An electronic device comprising the driver according to claim 7 .

9. An electronic device comprising the driver according to claim 4 .

10. The driver according to claim 1 , further comprising:
a variable capacitance circuit provided between the data voltage output terminal and a reference voltage node,
wherein a capacitance of the variable capacitance circuit is set so that a capacitance obtained by adding a capacitance of the variable capacitance circuit and an electro-optical panel-side capacitance is in a prescribed capacitance ratio relationship with a capacitance of the capacitor circuit.

11. An electronic device comprising the driver according to claim 10 .

12. An electronic device comprising the driver according to claim 1 .

Assignees

• Seiko Epson Corp

Inventors

• Morita Akira

Classifications

• G09G2330/06

  Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation · CPC title

• G09G2310/0297

  Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns · CPC title

• G09G3/20

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• H03M1/70

  Automatic control for modifying converter range · CPC title

• H03M1/0863

  of switching transients, e.g. glitches · CPC title