What is an LED (Light Emitting Diode)?

« Back to Product Matrix An LED (Light Emitting Diode) is the most commonly used component in backlights. LEDs are solid-state semiconductor devices that convert electrical energy directly into visible light. Two semiconductor materials are joined such that when a current is passed through the LED, light and heat are generated at the junction.
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What are the different types of backlights?

« Back to Product Matrix EL (Electroluminescent Lamp) An EL backlight is a solid-state component, which uses colored phosphors to generate light. These EL backlights are thin, lightweight, and provide very uniform lighting. EL panels are available in a wide variety of colors. While their power consumption is moderately low, they require voltages of 100 VAC @ 400 Hz supplied by an inverter that converts a 5, 12, or 24 VDC input to the AC output. EL backlights also have a limited half-life of 3,000 to 5,000 hours. The biggest drawbacks to ...
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What is a backlight?

« Back to Product Matrix Backlights are the light-emissive components positioned behind the LCD cell. Backlights are a part of all transmissive or transflective displays. When an LCD display is used in an environment where the ambient lighting will not support good reflective-mode visibility, the backlight luminance is required to give the display contrast and be legible. Backlights are also required in almost all full-color TFT displays due to the inherently low efficiency of the transmissive structure of the TFT cell.
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What are the four primary Polarization Viewing Types in LCD technology?

« Back to Product Matrix Transmissive The transmissive liquid crystal cell does not have reflective properties. Utilizing a backlight behind the display creates the image that is displayed on the screen, and the transmissive liquid crystal cell acts as a light valve to either allow the light to pass through the display or to block the light. This technology is used when there are few ambient light sources available. Reflective The reflective liquid crystal device has a reflector located on the rear of the cell, which reflects ambient light that is passed through ...
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What is viewing cone?

« Back to Product Matrix The viewing cone is the maximum viewing angle range that the display can either support a minimum contrast value, or not become inverted. For example, a monochrome display might support a contrast ratio of 2:1 minimum when viewed at 45 degrees from perpendicular in every direction around the display. Beyond 45 degrees, the contrast will dip below 2:1. Often these cones are not perfectly symmetrical.
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What is viewing angle?

« Back to Product Matrix The preferred viewing angle is the direction in which the display will have the highest contrast. Viewing directions are specified in terms of a clock position, where the viewer will look at the display from the preferred direction: • East 3 O'clock • South 6 O'clock • West 9 O'clock • North 12 O'clock South 6 O’clock and North 12 O’clock are the most commonly used for all display types.
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What is dot pitch or pixel pitch?

« Back to Product Matrix The dot pitch or pixel pitch is defined as the distance between the edge of a pixel and the same edge of the neighboring pixel. The dot pitch is measured in millimeters (mm), with a smaller number typically translating into a sharper image. Concurrently, a smaller pixel pitch for the same resolution LCD display will also result in a smaller image.
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What is a pixel?

« Back to Product Matrix A pixel (a word invented from "picture element") is the most basic unit of programmable visual content within an LCD display. For a common graphic 128x64 LCD, the display comprises 128 solid columns and 64 solid rows. The display is capable of producing a square pixel in each location where the rows and columns intersect. In this example of a 128x64 display, the LCD display is capable of producing 8,192 unique pixels to be used for simple text and/or graphic images.
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What are most common types LCD display fluids?

« Back to Product Matrix Twisted Nematic (TN) was one of the earliest fluid types to be implemented in LCD displays. Twisted Nematic LCD fluid uses a 90-degree twist between the top and bottom alignment layers of the LCD cell. The contrast of TN fluid displays is very high, but the limitations are that TN fluid can only support a limited multiplex rate, or limited number of rows. These displays are ideal for low information content, like simple character, segmented, or icon-based displays, commonly found in ...
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What are the different basic types of LCD technology for displaying letters, numbers, and graphics?

« Back to Product Matrix Segment LCD: In the most common format, the display segments are arranged to form a figure 8 to display numbers and letters. The same technology can be implemented to construct custom icons of any shape or pattern in an LCD display, as well. Character Display: The individual pixel units are arranged in 5x7 or 5x8 clusters to form characters. These displays are then characterized by how many rows and columns of pixel clusters, or characters, they can support. For example a 2x16 ...
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