Quad Output Switching Converter Provides Power for Large TFT LCD Panels:  DN349  Design Notes (Linear Technology)  (app note added 6/06)

Seven Segment LCD uses Two Wire Interface:  09/04/03 EDN Design Ideas  /  (added 1/05)  You can connect seven-segment LCDs using only a two-wire interface (Figure 1). The two-wire interface may be at the field-effect, direct-drive LCD or at a serial interface (such as I2C) that uses an eight-pin microcontroller. The design in Figure 1 uses an Atmel (www.atmel.com) ATtiny12 microcontroller, IC1....

Simple Active Matrix LCD Bias Supply Operates from Battery Input:  02/03/00 EDN Design Ideas  /  (added 11/05)  Many active-matrix-LCD applications need multiple voltages for thin-film-transistor (TFT) bias. Typically, three voltages are necessary: 5V for the column driver; a positive voltage, such as 10V; and a negative voltage, such -5V, for the TFT gate drive, or row driver. For handheld electronic devices, a battery must....

Simple tester checks LCDs:  10/03/02 EDN Design Ideas  /  (added 1/05)  Manufacturers of electronic equipment use LCDs for calculators, watches, mini-videogames, and pagers, for example. In comparison with LED-based displays, which consume power on the order of tens of milliwatts, an LCD consumes only a few microwatts. The LCD thus saves power by a factor of approximately 1000....

Small/Medium LCD Panel (less than 14 inch):  Intersil Application Block Diagram  (app note added 6/06)

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.

Testing LCD Backlight Inverters using the Agilent N6700 Modular Power System (MPS):  Agilent Application Note   (app note added 6/06)

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 optimised device selection, and compact packaging options   (app note added 2/06)

Tricks Improve on Excel LCD Initialization:  04/11/02 EDN Design Ideas  /  (added 1/05)  A previous Design Idea on using Excel for LCD initialization relies on the user for cutting and pasting from Excel into an editor (Reference 1). It appears that it would take a minimum of six keystrokes or mouse strokes from one character to a new character to perform this operation. This procedure does not allow for the addition of comments, which would be advantageous in the maintenance... ...

Two Wire LCD Interface using PIC16cf84:  (electronic (schematic / circuit added 4/02)

Ultra Low Power LCD Indicator:  This circuit serves as an ultra-low power replacement for multiple LED on-off indicators. It also has the advantage of being easy to read in full daylight. With the parts shown, it is possible to display four bits of information. The display that I used has three digits and 2 decimal points for a total of 23 segments. Different groupings of segments can be.... (added 10/05)

Ultracompact LCD Backlight Inverters:  AN81 Linear Technology It has become desirable to fashion laptop computers with large area screens, leaving little room for the display's backlight inverter electronics. Miniaturization limitations of high voltage magnetic transformers impose limits on achievable space reduction. Another voltage step-up technology, piezoelectric transformers, permits the desired size reduction and provides additional benefits. This publication describes practical piezoceramic transformers and support circuitry. Ancillary benefits of the piezoelectric approach are also described. Appended sections detail transformer operation and feedback loop considerations.

Using PIC16c5x Microcontrollers as LCD Drivers:  Microchip Application Note Published 26-Aug-97   (app note added 6/06)

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