TITLE

Visible light sensors can pay dividends in automatic brightness control applications

AUTHOR(S)
Ferguson, Bruce
PUB. DATE
January 2004
SOURCE
Portable Design;Jan2004, Vol. 10 Issue 1, p28
SOURCE TYPE
Periodical
DOC. TYPE
Article
ABSTRACT
Points out that visible light sensors are beneficial for automatic brightness control of portable devices such as personal digital assistants and cell phones. Observation that portable devices roam between locations having vastly different lighting; Need for a closed-loop system that lets the users set display brightness to their comfort level once; Automatic adjustment of brightness as dictated by changes in ambient light.
ACCESSION #
12048169

 

Related Articles

  • Ultra-Sensitive Photosensor Ignores Ambient Light. MANCINI, RON // Electronic Design;10/12/98, Vol. 46 Issue 23, p102 

    Describes a circuit design that preserves the photocell sensitivity with electronic feedback to produce an ultra-sensitive photo detector. Lamp voltage set at 9 volts; Change in photocell resistance from ambient room light to dark; Current source; Divider string; Integration time constant;...

  • Temperature sensor doesn't discharge battery. Travis, Bill; Swager, Anne Watson // EDN;8/01/96, Vol. 41 Issue 16, p106 

    Describes the electronic circuit of the active temperature sensor in the rechargeable battery that does not drain the battery. Use of only one terminal for sensor's power-supply input and temperature output; Resistor's connection to a positive voltage within the charger.

  • Current sensor measures 0 to 500A. Carrasco // EDN;09/30/99, Vol. 44 Issue 20, p118 

    Takes a look at a current sensor design idea. Ability to sense both low and high current levels without low sensitivities or loss of accuracy; Collection of series diodes.

  • Single chip detects optical interruptions. Baumgartner, Frederick M // EDN Europe;Mar2001, Vol. 46 Issue 3, p66 

    Presents a schematic design of a light-beam-breaker detector. Minimal-parts-count circuit with negligible power requirements; Function of a single chip in the circuit.

  • More electronic sensors. Rakes, Charles D. // Popular Electronics;Feb97, Vol. 14 Issue 2, p73 

    Presents information about some electronic sensor circuits. Vibration detector; Magnetic-field detector; Tilt sensor; Wind-direction sensor; Reed-switch replacement; More; Their constructions and functions.

  • Reflective object sensor works in bright areas. Rentyuk, Vladimir // EDN;7/29/2010, Vol. 55 Issue 14, p46 

    The article presents a design idea for a circuit that enables reflective object sensors to work in bright areas. It says that the proposed circuit design is an inexpensive solution to the problem of counting and identifying objects in the presence of electrical noise or bright ambient light. It...

  • PIR Light Controller Relies On A Missing-Pulse Detector. Henscheid, Bert // Electronic Design;8/9/2004, Vol. 52 Issue 17, p57 

    An electronic circuit diagram is presented which shows a way to control a light with a passive-infrared (PIR) alarm sensor. The original concept was to turn a closet or shop light on whenever someone went into the room and turn the light off when no one was in the area. In this application, the...

  • Universal Sensor Interface. Prutchi, David // Popular Electronics;Jun99, Vol. 16 Issue 6, p39 

    Provides information on the design and construction of the circuit for a sensor interface. Overview of the system; Types of sensors; List of parts needed in the project.

  • Acquire And Control Linear CCD Sensors Using EPP Protocol. Stojanovic, Radovan // Electronic Design;03/20/2000, Vol. 48 Issue 6, p131 

    Describes a simple and low-cost circuit that can control and acquire many commercial charge-coupled device (CCD) sensors using an interface based on the Enhanced Parallel Port protocol. Linear CCD sensor; Flash analog-to-digital converter; High-speed rail-to-rail amplifier; Timing generator...

Share

Read the Article

Courtesy of NEW JERSEY STATE LIBRARY

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics