JPS5582092A - Electronic wrist watch of liquid crystal type - Google Patents
Electronic wrist watch of liquid crystal typeInfo
- Publication number
- JPS5582092A JPS5582092A JP15701878A JP15701878A JPS5582092A JP S5582092 A JPS5582092 A JP S5582092A JP 15701878 A JP15701878 A JP 15701878A JP 15701878 A JP15701878 A JP 15701878A JP S5582092 A JPS5582092 A JP S5582092A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- temperature
- constant
- response
- secondary battery
- 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.)
- Pending
Links
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electric Clocks (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
PURPOSE: To always keep constant the display contrast, by producing the constant voltage with the secondary battery charged with sollar cell and using the pulse having the constant level due to the zero bias time in response to the detection temperature and having the width controlled with temperature.
CONSTITUTION: The constant voltage circuit supplies the constant level voltage to the liquid crystal drive circuit independently of the voltage variation immediately before or after the charging of the seoncary battery, by taking the secondary battery charged up with sollar cell as energy source. On the other hand, to this liquid crystal drive circuit, the zero bias time signal is fed corresponding to the temperature outputted with the temperature compensation circuit in response to the ambient temperature detected with the temperature detection element, and the liquid crystal drive circuit supplies the drive pulse different in the width in response to temperature at the constant level at all times to the liquid crystal element to perform the liquid crystal display with constant contrast at all times independently of the charging of secondary battery and ambient temperature.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15701878A JPS5582092A (en) | 1978-12-14 | 1978-12-14 | Electronic wrist watch of liquid crystal type |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15701878A JPS5582092A (en) | 1978-12-14 | 1978-12-14 | Electronic wrist watch of liquid crystal type |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5582092A true JPS5582092A (en) | 1980-06-20 |
Family
ID=15640376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15701878A Pending JPS5582092A (en) | 1978-12-14 | 1978-12-14 | Electronic wrist watch of liquid crystal type |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5582092A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002086853A3 (en) * | 2001-04-25 | 2003-11-20 | Nokia Corp | Method and apparatus for performing automatic display contrast adjustment in a battery powered device |
-
1978
- 1978-12-14 JP JP15701878A patent/JPS5582092A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002086853A3 (en) * | 2001-04-25 | 2003-11-20 | Nokia Corp | Method and apparatus for performing automatic display contrast adjustment in a battery powered device |
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