Display driver, electronic apparatus, and mobile body

Patent metadata

Field	Value
Publication number	US-2019392742-A1
Application number	US-201916449634-A
Country	US
Kind code	A1
Filing date	Jun 24, 2019
Priority date	Jun 25, 2018
Publication date	Dec 26, 2019
Grant date	—

Abstract

A display driver (100) includes a drive circuit (130) that drives an electro-optical panel (200), a control circuit (110) that controls the drive circuit (130), an error detection circuit (115) that detects an error in the display driver (100), and a counter (125) that performs count processing with respect to information regarding the number of times of error detection in an operating period of the display driver (100). The control circuit performs control such that information regarding the accumulated number of times of detection of the error is stored in a nonvolatile memory that can retain storage contents even if power is not supplied, based on the information regarding the number of times of detection.

First claim

What is claimed is:

1 . A display driver including a drive circuit that drives an electro-optical panel and a control circuit that controls the drive circuit, the display driver comprising:
an error detection circuit configured to detect an error in the display driver; and a counter configured to perform count processing with respect to information regarding the number of times of detection of the error in an operating period of the display driver, wherein the control circuit is configured to perform control such that information regarding the accumulated number of times of detection of the error is stored in a nonvolatile memory that can retain storage contents even if power is not supplied, based on the information regarding the number of times of detection.

2 . The display driver according to claim 1 ,
wherein the control circuit, after a reset of the display driver is cancelled, reads out the information regarding the accumulated number of times of detection from the nonvolatile memory, and updates the information regarding the accumulated number of times of detection stored in the nonvolatile memory, based on the information regarding the number of times of detection.

3 . The display driver according to claim 2 ,
wherein the control circuit updates the information regarding the accumulated number of times of detection stored in the nonvolatile memory in a period from when display of the electro-optical panel is turned off until the display driver is reset.

4 . The display driver according to claim 2 ,
wherein the control circuit regularly updates the information regarding the accumulated number of times of detection stored in the nonvolatile memory in the operating period.

5 . The display driver according to claim 2 ,
wherein the control circuit updates the information regarding the accumulated number of times of detection stored in the nonvolatile memory on the condition that a number of times of detection indicated by the information regarding the number of times of detection exceeds a threshold value.

6 . The display driver according to claim 1 ,
wherein the control circuit updates the information regarding the accumulated number of times of detection by writing information based on the information regarding the number of times of detection in a memory region of the nonvolatile memory that is different from a memory region in which the information regarding the accumulated number of times of detection before updating is stored.

7 . The display driver according to claim 1 ,
wherein, when the information regarding the accumulated number of times of detection is stored in first to mth bits (m is an integer of n−1 or less) of first to nth bits (n is an integer of 2 or more) in the nonvolatile memory, the control circuit updates the information regarding the accumulated number of times of detection by performing writing to a m+1th bit of the first to nth bits.

8 . The display driver according to claim 1 ,
wherein the control circuit, upon determining that the display driver is in an anomalous state based on the information regarding the accumulated number of times of detection, performs reporting processing of the anomalous state.

9 . The display driver according to claim 1 ,
wherein the operating period is a period including a reset-cancelled period of the display driver.

10 . The display driver according to claim 1 ,
wherein the counter is initialized when the display driver is reset.

11 . The display driver according to claim 1 ,
wherein the error is at least one of a register error, a state machine error, a voltage error, a clock signal error, and a display data error.

12 . An electronic apparatus comprising:
the display driver according to claim 1 ; and a processing device configured to control the display driver.

13 . The electronic apparatus according to claim 12 ,
wherein the processing device performs, upon determining that the display driver is in an anomalous state based on the information regarding the accumulated number of times of detection, reporting processing associated with the anomalous state.

14 . A mobile body comprising:
a display driver according to claim 1 ; and a processing device configured to control the display driver.

Assignees

• Seiko Epson Corp

Inventors

• Muraki Norichika

Classifications

• G09G3/30

  using electroluminescent panels · CPC title

• G09G3/20 Primary

  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

• G09G2330/12

  Test circuits or failure detection circuits included in a display system, as permanent part thereof · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G2380/10

  Automotive applications · CPC title