lcd screen polarizer brands

Alibaba.com has a fascinating collection of LCD polarized filters. They are used in photography to reduce glare while still allowing plenty of light to pass through, manage reflections and darken skies. They have a wide range of applications, including producing LCDs for use in TVs, laptops, and phones and producing polarized sunglasses and polarizing camera filters. LCD polarized filters are classified into linear, elliptical and circular filters.

LCD polarizing films are designed to block light waves of certain polarizations while allowing light waves of other polarizations to pass through for an immersive visual experience. They allow for deeper-looking colors and sharper images to be displayed on LCD screens. Alibaba.com offers a wide range of LCD polarized filters, including anti-glare matte film, plain glossy film, wide-angle view film and brightness enhancement film. They can either be horizontally polarized to reduce glare from horizontal surfaces such as water or vertically polarized to reduce vertical surfaces such as skylights.

Linear polarizer film is an excellent choice for applications that require glare reduction from reflected light. Shoppers can use them in telescope filters and in industrial imaging applications to moderate the light source. Circular polarized films are used where high resolution and glare reduction are required. They are either right or left-handed. LCD polarized filters are strong and long-lasting, and they can be reflective, transmissive or transflective.

Shop for a variety of LCD polarized filter designs at low prices on Alibaba.com. They are made of various materials such as plastic, glass and crystals. Polarized plastic sheets have high polarizing efficiency and are protected by an additional film.

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 primary job function of a LCD display polarizer is to improve definition, color and to control how light is reflected, transflected or transmitted; without the polarizer it would be impossible to read the display.

To understand the placement of the polarizer, it is necessary to explain the construction of a basic Liquid Crystal Display. (This does not apply to TFT, LED, VFD or OLEDs.)

Applying the two polarizers is the next step: One polarizer is applied to the top layer of glass; this must always be a Transmissive polarizer. The second polarizer is located on the back of the bottom layer of glass (farthest away from the person reading the LCD). This polarizer is selectable by the designer.

Details of the three types of polarizers are covered in more detail in another article, but below is a quick summary:Reflective Polarizer: For use in environments of bright ambient light such as indoors and direct sun light. This is a great choice for battery powered instruments where there will be sufficient ambient light.

Transmissive Polarizer: Provides the brightest backlight, but the display is difficult to read when the backlight if off. This is a poor option for battery powered products as the backlight can use a lot of power. This is also a poor choice for direct sun light as the display will look dark if the sunlight reflection overwhelms the backlight.

Transflective Polarizer (most popular): Combines functions of both the Reflective and Transmissive polarizers. It allows the display to be readable whether the backlight is on or off. In high ambient light conditions its contrast is not as good as the Reflective type and in low ambient light conditions, with the backlight on, the display is not as bright as the Transmissive type.

There is no difference in cost or lead time of the three polarizers; one variable that does affect the cost of the LCD module is the size of the glass.

The larger the size of the glass, the higher the cost to build the display, but when the glass size becomes too small the cost of the module increases. The reason is that the polarizer needs to be attached by hand which increases both the labor cost and the fall out rate

This article on choosing an LCD display polarizer is a guest journal from: John Keenan, MicroReady Inc., Electronic Product Design located in Phoenix, AZ.