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Technology Now

Mitsubishi Electric Color TFT-LCD Modules Technologies and Product Trends

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3. Optimal Design

Today, TFT-LCD modules are found in various applications in a wide range of environments. They are increasingly being used for the GPS navigation systems used in automobiles and ships as well as for outdoor POS terminals, ATMs and Kiosk terminal. The problem with using conventional LCD modules for personal computers is that they don't provide sufficient design for use in a bright outdoor environment. Mitsubishi Electric was among the first in the industry to “see the light,” and has been pioneering technologies that improve the design of LCD modules used outdoors. Design of an outdoor LCD module is affected by its luminance, surface reflection and transflective characteristics. We have developed and commercialized the three technologies described below to improve all these areas.

The majority of LCD modules used in our personal computers and televisions today have the widescreen specifications that are required to meet the new digital terrestrial broadcasting standards. As demand for widescreen industrial LCD modules has soared, Mitsubishi Electric has become the first manufacturer in the industry to offer a complete line-up of widescreen LCD modules designed for industrial applications.

3-1. Outdoor-use Technology: Superhigh Brightness

Mitsubishi Electric has enhanced light-use efficiency by optimizing heat dissipation and the backlight structure; an achievement realizing an superhigh brightness of up to 1,500 cd/m² for all LCD modules size (from 8.4- to 15-inch displays) commercially available from the company.

We also developed a specially coated backlight unit (shown in Fig. 3) to improve luminance. This compact device has enabled us to achieve luminance ratings as high as 1,500 cd/m². That's 3.5 times higher than the luminance of typical industrial LCD modules, and seven times higher than the luminance of typical personal computer LCDs at 200 cd/m²). Vastly improved luminance has enabled us to significantly boost the image visibility of our outdoor LCD modules.

Even though the XGA AA121XL01, our latest 12.1-inch ultrahigh brightness LCD module, is a thin 9.7 mm, it packs a high luminance rating of 1,000 cd/m². The huge amount of power saved by this compact LCD backlight unit puts it light years ahead of the CCFL.

Fig. 3 A typical superhigh brightness LCD module backlight. Fig. 4 Comparison of superhigh brightness LCD module luminance.

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