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LCD (Liquid Crystal Display) Circuits
LCD Circuits: #s - H      I - O      P - Z


Last Updated: October 24, 2017 02:55 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Pot Adjusts LCD's Contrast -  02/04/99 EDN-Design Ideas NOTE : Page includes several designs.  Scroll to find this one.  You can use a digitally controlled potentiometer for many purposes.  In this example, you can use the device to regulate the contrast of a standard (such as two lines by 40 characters] LCD.  You can use the circuit in Figure 1 in a portable test system, in which you need to change the contrast of the LCD as a function of the viewing angle.  You choose the contrast setup __ Circuit Design by Jef Collin, CSE Systems, Turnhout, Belgium

Potentiometer Controls LCD Bias -  03/17/94 EDN-Design Ideas Designers of pen-based computers can easily relegate some controls that were previously mechanical, such as switches and potentiometers, to on-screen icons.  For example, the circuit in Fig 1 shows one way that digital logic can control the -24V-dc LCD bias using two general-purpose I/O command lines.  The DS-1669 from Dallas Semiconductor __ Circuit Design by Michael Cortopassi, Dauphin Technology, Lombard, I - L

Precision Wideband Current Probe for LCD Backlight Measurement -  DN101 Design Notes__ Linear Technology/Analog Devices

Processor's PWM output controls LCD/LED driver -  27-May-04 EDN-Design Ideas The PWM (pulse-width-modulation] output available from many microprocessors is based on an internal 8- or 16-bit counter and features a programmable duty cycle.  It is suitable for adjusting the output of an LCD driver (Figure 1) , a negative-voltage LCD driver (Figure 2], or a current-controlled LED driver (Figure 3] __ Circuit Design by Joe Neubauer, Maxim Integrated Products, Sunnyvale, CA

Programable LCD counter with memory backup -  This counter based on AT90S1200A its  programmable and when shut it down its keeping  the  current counts to the memory, until to the  power on. __ Designed by © Vassilis Serasidis

Programming Fun Lights with TI's TCA6507 -  App Note , 30-Nov-07 __ Designed by Texas Instruments

Provide Effective LCD Drive -  09/28/00 EDN-Design Ideas LCDs find wide use in portable instruments, thanks to their attractive display and low power consumption.  The circuit in Figure 1 is an effective driver for LCDs.  The circuit comprises two main sections—the ICM7211 drivers  (IC2  __ Circuit Design by Luo Ben Cheng, Chinese Academy of Science, Beijing, China

Put Your Own Smiley On GLCD -  The regular 16×2 LCD can display characters of only certain dimensions.  A graphical LCD  (GLCD) , on the other hand, can display custom graphics.  GLCDs are therefore highly suitable for mobile and...__ Electronics Projects for You

Quad Output Switching Converter Provides Power for Large TFT LCD Panels -  DN349 Design Notes __ Linear Technology/Analog Devices

Rolled-Off Noise Source -  This is a circuit that generates white noise, rolled-off to drive earphones or a small speaker.  White noise creates is a "rushing" sound, which sounds something like air rushing by your ear    (s) .  White noise would be flat with frequency, and since this circuit rolls off within the audio range, I refer to it as "rolled-off" noise.  White    (or rolled-off) noise __ Designed by Dick Cappels

Serial Interface & bias supply for Seiko-Epson G1206B dot Graphics display -  A serial interface and bias supply for the Seiko-Epson G1216N000 using an AT90S2313 because there just aren't enough applications examples for this display on the web.   __ Designed by Dick Cappels

Serial Interface for Truly MTC-C162DPLY-2N, 2 line X 16 char LCD display -  A serial interface and bias supply for the Seiko-Epson G1216N000 using an AT90S2313 because there just aren't enough applications examples for this display on the web.   __ Designed by Dick Cappels

Serial LCD Controller -  Serial LCD/VFD Controller is a HD44870 based LCD/VFD controller via RS-232.  The control command is compatible with Matrix-Orbital's LCD module.  So, you can use any MO friendly software to control this baby such as LCDC.  

Serial LCD for microControllers using only 3 pins -  Connect an LCD to your microcontroller to make it easy to develop and debug your application.  You can choose which PIC I/O pins you want to use for the interface, and any HD44780 compatible LCD can be controlled.   __ Designed by Peter Jakab

Serial LCD Module -  In most electronic systems, it is necessary to provide information in the visual form for a convenient user interface.  The most commonly used displays in electronic systems are LED, LCD and...__ Electronics Projects for You

Series Connected Voltage Boost for a Battery Operated LED Lantern -  A circuit that goes in series with a white LED and a 1.5 volt cell to make > 3 Volts to drive a white LED __ Designed by Dick Cappels

Seven-Segment LCD Uses Two-Wire Interface -  09/04/03 EDN-Design Ideas 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.  VCC can range from 2.7 to 5.5V.  Each digit receives drive from an 8-bit 74HC164 shift register, which provIdeas seven outputs for each of the segments and one output for a decimal point or a colon __ Circuit Design by Hans Krobath

Simple Circuit active-matrix-LCD bias supply operates from battery input -  02/03/00 EDN-Design Ideas Many active-matrix-LCD applications need multiple voltages for thin-film-transistor    (TFT]bias.  Typically, three voltages are necessary5V forcolumn driver; a positive voltage, such as 10V; and a negative voltage, such -5V, for  __ Circuit Design by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA

Simple Circuit LCD interface takes two wires -  EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  Alphanumeric LCD modules can provide an attractive display for a project, but their parallel I/O lines require a large number of outputs from a µC. For example, a direct LCD interface would consume all of the I/O pins of a small µC, such as the eight-pin PIC12C508 from Microchip Technology  (Chandler, AZ) . __ Circuit Design by Ed Maste, Jem Designs, Pickering, ON, Canad

Simple Circuit Tester Check LCDs -  10/03/02 EDN-Design Ideas RF oscillator uses current-feedback op ampManufacturers 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.    __ Circuit Design by D Prabakaran, NL Polytechnic College, Tamil Nadu, India

Single Cell TPS61041 LED Driver -  Texas Instruments provides a broad portfolio of high-performance products for your LED design needs.  From RF and power management  (including AC/DC, Power Factor Correction, DC/DC and linear power conversion) to DSPs and ultra-low-power MCUs, TI has products to differentiate your design.  And, TI's local support and applications expertise can help you get to market faster.   __ Designed by Texas Instruments App Notes, 9-Jun-03

Single IC Biases LCD & GaAsFET Amplifier -  04/09/98 EDN-Design Ideas -  (File ,contains several circuits, scroll to this one) Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in Figure 1  provIdeas 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power amplifier.  This bias combination exists in cell phones __ Circuit Design by John Wettroth, Maxim Integrated Products, Apex, NC

Techniques for 92% Efficient LCD Illumination -  Linear Technology AN55 __ Designed by Jim WilliamsAug 1st, 1993

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, __ Linear Technology/Analog Devices

Techniques illuminate backlit LCDs with high efficiency -  01/06/94 EDN Technical Article: Getting a backlight LCD lamp to turn on is just the first step in the design process.  Achieving and maintaining high efficiency requires attention to both circuit-design and physical-layout details.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Tester checks LCDs -  10/03/02 EDN-Design Ideas RF oscillator uses current-feedback op ampManufacturers 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.    __ Circuit Design by D Prabakaran

TLC5940 PWM dimming provides superior color quality in LED video displays -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 18-Apr-06

TPS60230 WLED Charge Pump -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 9-Nov-05

Tricks improve on Excel LCD initialization -  04/11/02 EDN-Design Ideas A previous Design Ideas 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 __ Circuit Design by Aubrey Kagan, WeidmĂĽller Ltd, Markham, ON, Canada

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.   __ Designed by G. Forrest Cook

Ultracompact LCD Backlight Inverters -  Linear Technology AN81 __ Designed by Jim WilliamsSep 1st, 1999

Ultracompact LCD Backlight Inverters -  AN81 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, __ Linear Technology/Analog Devices

Waveform Monitor with LCD -  The result was a project that includes a waveform capture circuit, a graphic LCD  (Liquid Crystal Display) and a control panel with LED indicators.  The details of the Graphic LCD display unit, composed of the LCD module, a serial interface, and bias supply were published earlier on this site,  __ Designed by Dick Cappels

White LED driver backlights LCD & keypA - D -  13-Nov-03 EDN-Design Ideas 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 keypad __ Circuit Design by Fabien Franc, Catalyst Semiconductor, Sunnyvale, CA

White Light LED Driver with Gradual Dimming (Rev. A) -  TI Application Note:  Many consumer products using white light LEDs for illumination and backlighting provide gradual LED illumination at turnon and turnoff.  This gradual illumination is usually achieved with the aid of a microprocessor that provides PWM dimming control.  This circuit uses the Texas Instruments TPS61040 white light LED driver to provide gradual illumination at turnon and turnoff without the use of a microprocessor __ SLVA122A–November 2002–Revised January 2010


LCD Circuits: #s - H      I - O      P - Z

 


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