Sharp Develops Its LCD Line-Up

Published:2011/12/11 21:48:00 Author:Amy From:SeekIC

Sharp is planning to expand its LCD line-up with three new models in the new year. The portfolio of ultra-low power displays will now include 13 different types with diagonals of 1.17" (2.97 cm) to 6.02" (15.3 cm).

With the new 4.4" (11.09 cm) LS044Q7DH01 Memory LCD, Sharp will bridge the gap between the 2.94" and 6.02" diagonals. The display has 320 x 240 pixels. The high level of reflectivity of 17.5% and the viewing angle of 120° in all directions ensure good readability. Sharp has also equipped the LS044Q7DH01 with a transmissive portion of 0.25%. This function is an advantage for sports computers and even for measuring devices, which sometimes also have to be used at night. The LS044Q7DH01 also belongs to the class of ultra-low power displays, with a power input (without backlight) of just 0.25 mW with static images and 0.65 mW with a frame rate of 1Hz.

In the lower end of its range of sizes, Sharp has expanded its range of Memory LCDs with models LS012B4DG01 (1.17" diagonal) and LS013B7DH03 (1.28" diagonal). The 1.28" version is impressive.

With its shape: the edges have a length of 35.1 x 11.0 millimetres and a resolution of 184 x 38 pixels. Consequently, the display is equally sturdy at operating temperatures ranging between -10°C and +70°C. In addition, the relatively long ribbon cable of approx. 52 mm allows the display to be flexibly positioned and integrated in the housings of cordless screwdrivers, drills etc.

Each pixel of the innovative display has a 1-bit memory that stores the image data loaded on the screen, so it has minimal energy consumption. As reflective displays, Memory LCDs also require no backlighting. The combined result is that Memory LCDs require only 0.8 percent of the power needed by conventional displays of the same size. In the case of conventional transmissive LC displays, microcontrollers have to rewrite the entire screen content from frame to frame at a speed of 50 to 60 Hz. In addition to this, the backlight accounts for a good percentage of the power consumed. This means that the power consumed by standard LCDs is approximately 130 times higher than that of Memory LCDs.

By the reason of minimal power consumption, small solar cells can supply sufficient power to operate the entire application. In order that such energy self-sufficient solutions can be easily designed in, Sharp also offers most Memory LCDs as 3-volt models, so that when operating with conventional lithium-ion batteries there is no need for using a charge pump.

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