Techniques for 92% Efficient LCD Illumination:  AN55 Linear Technology This publication details several LCD backlight circuits which feature 92% efficiency. Other benefits include low voltage operation, synchronizing capability, higher output power for color displays, and extended dimming range. Extensive coverage of practical issues includes layout problems, multi-lamp displays, safety and reliability concerns and efficiency and photometric measurements. Also included is a review of circuits which did not work along with appropriate commentary.

Telephone Number Display #2:  (circuit / schematic design added 6/06)

Telephone Number Display:  The given circuit, when connected in parallel to a telephone, displays the number dialed from the telephone set using the DTMF mode. This circuit can also show the number dialed from the phone of the called party. This is particularly helpful for receiving any number over the phone lines. The DTMF signal—generated by the phone on dialing a number—is decoded by DTMF decoder CM8870P1 (IC1), which converts the received DTMF signal into its equivalent BCD number that....   (added 10/05)

Teletext Devices:  (circuit added 7/02)

Three-Colour Display using Bicolour LEDs:  (electronic Circuit / Schematic added 10/04)

Tone Display System:  This device gives visual feedback of which note you're playing, so you can set up the note before bringing up the volume to sound it. It features a 40-LED display, for over three octaves of range at any given time. Furthermore, a three-position switch extends the range by two octaves, for a total usable range of over five octaves. (added 7/03)

Transistor Considerations for LCD Backlighting: High Efficiency DC-to-AC Conversion:  Zetec Semiconductors  Applications Notes A study of the parametric requirements of Bipolar transistors for the self-oscillating resonant "Royer" inverter with respect to LCD backlighting, including circuit behaviour, the voltage ratings of most relevance to ensure optimized device selection, and compact packaging options   (app note added 2/06)

Two Wire LCD Interface using PIC16cf84:  (schematic / circuit design added 9/02)

Using the AD7877 Touch Screen Controller and the Intel PXA250 Processor Under Windows CE.NET:  AN-738 Analog Devices Application Notes  (app note added 6/06)

Using the Noise Reduction Feature on the AD7877:  AN-766 Analog Devices Application Notes  (app note added 6/06)

VG Generator that Displays an Image in the XS Board RAM on a VG Monitor:  example of using Virtex series FPGA to generate VGA signals (added 6/06)

Wall Clock Governor Driver :  (electronic (schematic / circuit added 2/05)

White LED Driver Backlights LCD and Keypad:  11/13/03 EDN Design Ideas  /  (added 1/05)  Designers widely use white LEDs to backlight color LCDs and keypads in handheld devices, such as cell phones, MP3 players, GPS navigators, and PDAs. Their spectrum and brightness represent near-ideal light sources. One possible configuration for a phone or a phone/PDA combination is to have a group of three LEDs to light the display and six LEDs for the

White LED Driver Provides 64 Step Logarithmic Dimming:  06/10/04 EDN Design Ideas  /  (added 1/05)  The circuit in this Design Idea is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3V source.

White LED Driver Touts High Efficiency:  06/12/03 EDN-Design Ideas / (added 7/03) White LEDs, the most recent addition to the LCD backlight, find common use in providing backlight for color LCDs. Thanks to their size and white-light output, they appear in small, portable devices with color displays, such as PDAs and cellular phones. Like other LEDs, a white LED needs a constant-current source—typically,....