JPH03228018A - Automatic turning on/off device for back light - Google Patents

Automatic turning on/off device for back light

Info

Publication number
JPH03228018A
JPH03228018A JP2308990A JP2308990A JPH03228018A JP H03228018 A JPH03228018 A JP H03228018A JP 2308990 A JP2308990 A JP 2308990A JP 2308990 A JP2308990 A JP 2308990A JP H03228018 A JPH03228018 A JP H03228018A
Authority
JP
Japan
Prior art keywords
back light
input device
external input
time
turned
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2308990A
Inventor
Yoshimasa Kondo
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP2308990A priority Critical patent/JPH03228018A/en
Publication of JPH03228018A publication Critical patent/JPH03228018A/en
Application status is Granted legal-status Critical

Links

Abstract

PURPOSE: To prevent power consumption caused by turning a back light on from being increased in such a software that has the need of using an external input device by performing the control of automatically turning the back light on/off even in the case of using the external input device other than a key board.
CONSTITUTION: While the external input device 4 is in use, a time till the light is automatically turned off is reset at a specified address in a RAM every time when the external input device is used. Turning the back light on/off in a liquid crystal display device 1 is performed by setting an internal register. That means, as to the processing by interrupting to a CPU at fixed time intervals, whether the back light is already turned off or not is checked, and in the case that the back light is not turned off, the time after the external input device is not used is monitored, and in the case that the time becomes equal to the set time by an user, the back light is turned off by setting the Bit of the internal register '0'.
COPYRIGHT: (C)1991,JPO&Japio
JP2308990A 1990-02-01 1990-02-01 Automatic turning on/off device for back light Granted JPH03228018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2308990A JPH03228018A (en) 1990-02-01 1990-02-01 Automatic turning on/off device for back light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2308990A JPH03228018A (en) 1990-02-01 1990-02-01 Automatic turning on/off device for back light

Publications (1)

Publication Number Publication Date
JPH03228018A true JPH03228018A (en) 1991-10-09

Family

ID=12100703

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2308990A Granted JPH03228018A (en) 1990-02-01 1990-02-01 Automatic turning on/off device for back light

Country Status (1)

Country Link
JP (1) JPH03228018A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7821489B2 (en) * 1990-03-23 2010-10-26 Panasonic Corporation Data processing apparatus
JP2011138142A (en) * 2011-01-24 2011-07-14 Kenwood Corp Electronic equipment and electronic equipment system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7821489B2 (en) * 1990-03-23 2010-10-26 Panasonic Corporation Data processing apparatus
JP2011138142A (en) * 2011-01-24 2011-07-14 Kenwood Corp Electronic equipment and electronic equipment system

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