Liquid crystal device, electronic apparatus, and mobile body

Patent metadata

Field	Value
Publication number	US-11536994-B2
Application number	US-202117406570-A
Country	US
Kind code	B2
Filing date	Aug 19, 2021
Priority date	Dec 27, 2018
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A liquid crystal device includes a liquid crystal panel and a liquid crystal driver. The liquid crystal panel includes a segment electrode, a segment signal line connected to the segment electrode, and a segment signal line connected to the segment electrode. The liquid crystal driver includes a segment terminal to be connected to the segment signal line, a segment driving circuit that outputs a segment driving signal to the segment terminal, a segment terminal to be connected to the segment signal line, and an anomalous segment detection circuit that detects anomalous driving of the segment electrode based on a segment monitoring signal that is input to the segment terminal from the segment electrode via the segment signal line.

First claim

What is claimed is:

1. A liquid crystal device comprising:
a liquid crystal panel; and
a liquid crystal driver configured to drive the liquid crystal panel,
wherein the liquid crystal panel includes:
a first segment electrode;
a first segment signal line connected to the first segment electrode; and
a second segment signal line connected to the first segment electrode, wherein the first segment signal line, the first segment electrode and the second segment signal line are in series with the first segment electrode between the first segment signal line and the second segment signal line, and
the liquid crystal driver includes:
a first segment terminal connected to the first segment signal line;
a second segment terminal connected to the second segment signal line; and
a segment driving circuit configured to input a segment monitoring signal to the second segment terminal from the first segment electrode through the second segment signal line.

2. The liquid crystal device according to claim 1 ,
wherein the liquid crystal driver includes:
a common driving circuit configured to output a common driving signal for driving a common electrode of the liquid crystal panel;
a first common terminal from which the common driving signal is output to the common electrode; and
a second common terminal to which a common monitoring signal, which is a monitoring signal from the common electrode, is input.

3. The liquid crystal device according to claim 1 ,
wherein the segment driving circuit includes:
a segment signal output circuit configured to output a segment signal based on segment driving data; and
an output circuit configured to output a first segment driving signal based on the segment signal, and
further comprising an anomalous segment detection circuit configured to detect anomalous driving by comparing the segment monitoring signal and the segment signal.

4. The liquid crystal device according to claim 1 , wherein the first segment terminal and the second segment terminal are arranged adjacent to each other.

5. The liquid crystal device according to claim 1 , wherein the first segment terminal and the second segment terminal are arranged adjacent to each other along a longitudinal direction of the liquid crystal driver.

6. The liquid crystal device according to claim 1 , wherein the first segment terminal and the second segment terminal are arranged adjacent to each other along a direction that intersects a longitudinal direction of the liquid crystal driver.

7. The liquid crystal device according to claim 1 ,
wherein the liquid crystal panel includes:
a second segment electrode; and
a third segment signal line connected to the second segment electrode,
the first segment electrode is connected to the liquid crystal driver via the first segment signal line and the second segment signal line, and
the second segment electrode is connected to the liquid crystal driver via the third segment signal line.

8. The liquid crystal device according to claim 7 ,
wherein the liquid crystal driver has short sides at two ends of a long side, and includes a third segment terminal to which the third segment signal line is connected, and
the first segment terminal and the second segment terminal are arranged at a position, on the long side of the liquid crystal driver, further from one of the short sides relative to the third segment terminal.

9. The liquid crystal device according to claim 7 ,
wherein the first segment electrode is an electrode for displaying an icon, and
the second segment electrode is an electrode for displaying a numeric character, a character, or a meter.

10. The liquid crystal device according to claim 1 , wherein the first segment electrode is an electrode for a liquid crystal shutter.

11. An electronic apparatus comprising the liquid crystal device according to claim 1 .

12. A mobile body comprising the liquid crystal device according to claim 1 .

Assignees

• Seiko Epson Corp

Inventors

• Kobayashi Hironori
• Muraki Norichika

Classifications

• G09G2330/08

  Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared · CPC title

• G02F2201/506

  Repairing, e.g. with redundant arrangement against defective part · CPC title

• G02F1/13306 Primary

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F1/134327 Primary

  Segmented, e.g. alpha numeric display · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title