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Journals

PWM driven LED backlight for LCDs

This article on pulse width modulation / PWM was provided by: Gunn Systems, Inc. (www.gunnsys.com)There are several methods available to drive the backlight; one of the most popular is Pulse Width Modulation (PWM). The majority of LCD displays contain a LED (Light Emitting Diode) backlight.Pulse Width Modulation is a popular way of dimming the LED [...]

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LCD Polarizers: Reflective, Transflective and Transmissive

When asking us questions about LCD polarizers, you may be pummeled with questions like: “Will the LCD operate in direct sun light?”  “Or will it operate only in the dark?”  “Or will it be a combination of both?”  “Is it battery powered?” You may feel like you are being cross examined in front of a judge and jury.  I don’t [...]

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How to connect the LED backlight

Connect the LED backlight to Character LCD Displays: This article will be limited to character LCD Displays and the three methods available to connect the LED backlight to a power source. All three methods will work, but not all are recommended. “ Will your LCD display require a backlight?”  This is one of the first questions we ask [...]

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Engineers avoid the EL backlight for new LCD Designs

Why engineers avoid the EL backlight for new LCD Designs Below are seven reasons why the move from the EL backlight to LED backlights is being made on new product designs. When designing new products, the majority of engineers are opting for a side-lit LED backlight display over EL (Electroluminescence), even though some LED (Light Emitting Diode) [...]

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Choosing an LCD Display Polarizer

This article on choosing an LCD display polarizer is a guest journal from: John Keenan, MicroReady Inc., Electronic Product Design located in Phoenix, AZ. When designing a Liquid Crystal Display, including character, graphic and segment displays, a LCD display polarizer needs to be selected that will optimize the ambient lighting conditions the display will operate in.The [...]

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LCD Displays: How to make a LED backlight brighter

There are a few techniques that can be employed to make the LED backlight brighter, but if your goal is to compete with (or against) the direct sun light, there are better methods than to increase the brightness of the backlight. “We need the brightest LED backlight possible for our new LCD design and we need [...]

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LCD Modules: Reversing the polarity of LED backlights

What is Polarity? Polarity as defined by the dictionary:the property or characteristic that produces unequal physical effects at different points in a body or system, as a magnet or storage battery. the positive or negative state in which a body reacts to a magnetic, electric, or other field. However you state it, polarity is critical; even in LCDs.  [...]

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EL backlights vs LED backlights (legacy display technology vs cutting edge)

EL backlights vs LED - the move has been made When looking at EL backlights vs LED backlights there are three important reasons (listed below) influencing most engineers, Original Equipment Manufacturers (OEMs) and design houses to choose LED backlights over EL backlights on new product designs. Today Google celebrates scientific achievements by changing their home page to [...]

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The LED backlight for Segment Displays

This tech bulletin introduces the LED backlight for a segmented LCD display module and is valid for all types of standard and custom segment LCD displays.  Segment LCDs continue to be a popular LCD technology for new designs that require low power consumption and low cost where a color displays, such as a TFT or [...]

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LCD driving voltage for low power segment LCDs

LCD Modules - Custom LCD Modules Design Guide This article, a continuation in Custom LCD Modules Design Guide for engineers, covers the LCD driving voltages for a static-segmented LCD Display module. This article is good for all types of standard and custom segment LCD Displays.Low Power LCDs: from wall plugs to batteries Society has become more mobile [...]

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