§
Luxuse
Patent Intelligence
Sign In
Patent EP0329399A2 successfully refreshed from Google Patents.
← Back to Patent Explorer
EP0329399A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Small-sized equipment with a liquid crystal display

Assignee: NEC Corp
•
Filing: 1989-02-15
•
Granted: —
•
Expires: 2009-02-15
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A vehicle-mounted telephone or similar small-sized equipment having a handset (12) with a liquid crystal display (LCD) (16) and a cradle (14) for holding the handset in place. Sensor (24) is built in at least one of the handset and cradle to determine whether or not the handset is present on the cradle. In response to a sense output of the sensor (24), a controller varies drive voltage which is applied to an LCD driver and thereby varies the visual angle of the LCD automatically. The drive voltage selectively has a first value associated with a first visual angle which occurs when the handset is mounted on the cradle and a second value associated with a second visual angle which occurs when the handset is removed from the cradle. The controller further controls the drive voltage in such a manner as to selectively apply drive voltage associated with any of a desired number of visual angles to the LCD driver. An implementation is provided for allowing a person to manually change the drive voltage in a stepless or analog fashion as desired.

Inventors

  • 👤 Kazuaki Iguchi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 10:15
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/0202; H04M1/026; H04M1/0266; H04M1/04; H04M1/06; H04M1/08; H04M1/10; H04M1/60; H04M1/6033; H04M1/6041; H04M2250/00; H04M2250/12

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 96 words
Small-sized equipment having a liquid crystal display (LCD), comprising: a hand-held portable unit on which said LCD is mounted; support means for holding said portable unit when said portable unit is mounted on said support means; sensor means built in at least one of said portable unit and said support means for determining whether or not said portable unit is mounted on said support means and producing a sense signal; and control means provided in said portable unit for varying a visual angle of said LCD in response to the sense signal from said sensor means.
Claim 2
Dependent Claim 96 words
Small-sized equipment having a liquid crystal display (LCD), comprising: a hand-held portable unit on which said LCD is mounted; support means for holding said portable unit when said portable unit is mounted on said support means; sensor means built in at least one of said portable unit and said support means for determining whether or not said portable unit is mounted on said support means and producing a sense signal; and control means provided in said portable unit for varying a visual angle of said LCD in response to the sense signal from said sensor means.
Claim 3
Dependent Claim 19 words
Equipment as claimed in claim 1, wherein said sensor means comprises a hook switch built in said support means.
Claim 4
Dependent Claim 27 words
Equipment as claimed in claim 1, wherein said sensor means comprises a reed switch built in said support means and a magnet built in said support means.
Claim 5
Dependent Claim 102 words
Equipment as claimed in claim 1, wherein said control means comprises: a driver for driving said LCD; a power source for feeding power to said driver; and a controller for controlling said power source such that a first drive voltage associated with a first visual angle is fed to said driver when the sense signal from said sensor is representative of presence of said portable unit on said support means, and a second drive voltage associated with a second visual angle is fed to said driver when the sense signal is representative of absence of said portable unit on said support means.
Claim 6
Dependent Claim 75 words
Equipment as claimed in claim 1, wherein said control means comprises: a driver for driving said LCD; an analog switch for producing a plurality of drive voltages which are selectively applied to said driver; and a controller for controlling said analog switch such that one of the drive voltages which is associated with a desired visual angle is selected and outputted by said analog switch in response to the sense signal from said sensor means.
Claim 7
Dependent Claim 14 words
Equipment as claimed in claim 5, wherein said analog switch comprises a multi-channel multiplexer.
Claim 8
Dependent Claim 14 words
Equipment as claimed in claim 6, wherein said control comprises a central processing unit.
Claim 9
Dependent Claim 32 words
Equipment as claimed in claim 5, wherein said control means further comprises manual drive voltage varying means accessible for manually varying the drive voltage fed to said driver in an analog fashion.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag