The 16:9 format 7-inch diagonal screen is emerging as a popular option for numerous portable test, measurement and input devices spanning all industrial sectors – logistics, transport, medicine, vehicle manufacturing and repair, the hotel trade and catering, etc – and various consumer applications such as pocket PCs, media players and electronic picture frames.
To cover the entire range of applications, Sharp has unveiled a series totalling five industrial standard 7-inch TFT LCDs. The spectrum ranges from the robust screens of the more mechanically resilient Strong2 class with extended temperature range from -30°C to 80°C to a ‘light’ type LQ070Y3DG3A variant, with an operating temperature of -20°C to 50°C which is designed to be more suitable for consumer applications. This display is also available as a touch screen model (type LQ070Y3DG3B) boasting very good optical properties: with 300 cd/m² it possesses comparatively high brightness and is equal in terms of contrast to its non-touch screen sister model. The TFT LCD is also slim, at 7,1 mm being only 1,1 mm deeper than the variant without the touch screen unit.
In addition to the 800 x 480 pixel resolution, what the five new 7-inch industrial displays have in common is their LED-based backlight. Compared with conventional CCFL backlights, two of the principal advantages of LEDs for industrial applications are their rapid responsiveness and good dimming qualities. This makes it possible to automatically adjust the display’s brightness so that legibility remains consistently good even in frequently changing light conditions.
At high temperatures, however, LEDs are sensitive. The generation of large amounts of heat, occurring locally in the vicinity of the illuminants, must be effectively evacuated as it can damage the LCD panel and backlight itself, considerably reducing their life. Consequently, Sharp has developed a special chassis for LED backlit industrial displays in which the backlighting LEDs are linked thermally directly with the mechanical parts of the module. Waste heat is thereby vented effectively through the rear of the display into the surrounding area so that no harmful heat accumulates, even at high ambient temperatures.
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