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Unique coating technology for diffuser films boosts optical performance of LCDs

Autotype International : 10 February, 2006  (New Product)
MacDermid Autotype, one of the world
The new Backlight Diffuser Films feature a unique, optically clear hard coating that significantly enhances the performance of LCD displays, improving brightness, diffusion and homogeneity of emitted light, while reducing light absorption losses through the diffuser to less than 1%.

The new BLD films are available in different thicknesses, haze and transmission levels according to application and can be used either as a top diffusion layer, positioned between the lens sheet and LCD layer, or as a bottom diffuser placed between the light guide and lens sheet. The unique MacDermid Autotype coating technology offers particular advances for thinner diffusers i.e. 50 microns which are used for high resolution colour mobile displays or other electronic handheld devices.

Diffusion films are used in the manufacture of LCD panels to ensure that the display illumination is uniform, with as much light as possible reaching the viewer. To date, however, many diffusion films have been produced with a fixative coating with diffusing particles and filler materials to provide acceptable mechanical properties; however, this construction also affects the optical characteristics of the film, scattering or absorbing light to reduce levels of light transmission and uniformity.

By comparison, the new MacDermid Autotype BLD films use a mechanically stable, high clarity PET base, with a micro-roughened anti-Newton back coating, to eliminate Moiré effects, and a uniquely formulated front layer coating that is resistant to chemical and physical damage, yet produces excellent optical characteristics. In particular, the new film allows over 92% of the light to be directly transmitted, without affecting the colour balance or uniformity of the light emitted.

The robust mechanical properties of the new film make it easy to handle in production. A further benefit compared to conventional diffuser films is that there are no particles or fillers to become dislodged and therefore to contaminate the backlight production process, this in turn leads to high yields and quality. Perhaps as importantly, the new BLD films are manufactured in clean room production facilities, enabling MacDermid Autotype to ensure that the quality of the diffusion hard coat layer is consistent and uniform across every sheet of film produced, eliminating the problems of pin holes and scratches often associated with such films.

Patty Yan, Product Marketing Manager, commented that the unique coating technology used in MacDermid Autotype BLD Diffuser films offer the backlight manufacturer and customer significantly enhanced quality and performance for ever more demanding display applications.
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