Through an integrated image memory, Sharp’s ‘Memory LCDs’ purportedly only require around 1% of the power of conventional TFT LCDs and are therefore particularly suited for low-power use. The lineup of 1,35 to 6,02-inch variants covers a broad range of applications.
In addition to the 1,35-inch model (LS013B4DN02) introduced last year, Sharp is introducing further Memory LCDs in new sizes: two 2,7-inch (LS027B4DN01, LS027B4DH01) displays with a resolution of 400 x 240 and a 2,94-inch (LS029B4DN01) model with a resolution of 456 x 240 pixels. Also new is a 6,02-inch model specifically addressing the e-books market and other portable reading devices. For this particular market segment, Sharp is supplementing the range with transflective and touch screen models. Unlike the usual reflective Memory LCDs, transflective memory LCDs offer the option of adding backlighting so that e-books or other applications can also be used in the dark.
These LCDs are based on Sharp’s Continuous Grain Silicon (CGS) technology which enables it to equip each pixel with a 1-bit memory that stores the image information uploaded onto the screen. Image information therefore only needs to be rewritten in those pixels in which the content has changed compared to the previous picture frame. As reflective displays, Memory LCDs do not require any backlighting. The combined effect means that memory LCDs only have 0,8% of the power consumption of conventional displays of the same size. A 1,35-inch Memory LCD uses 15 μW in operation, whereas a standard LCD of comparable size requires around 2 mW to display an image.
The LCDs offer a unique image representation. Unlike other reflective displays, this new type of LCD does not require any polarisers. Thanks to a special polymer network liquid crystal (PNLC) material, the image is generated by the status of the pixel changing from transparent to white with a reflectivity of 50%. This gives the display a silver-metallic appearance that is particularly suited to fashionable applications. With a slightly more conventional version of the Memory LCDs, polarisers and high-reflective (HR) liquid crystals are used. They supply a pure black-and-white image with excellent legibility and a broad viewing angle.
Thanks to their minimal consumption of power, small solar cells can supply sufficient electricity to run the new Memory LCDs. The new type of display is thus a suitable solution for small portable applications such as e-books, wristwatches, shelf labelling, heart rate monitors and other fitness devices. In order to simplify design-in, Sharp also offers memory LCDs as 3 V models so that when operated with conventional lithium ion rechargeable batteries, no charge pump is required.
For more information contact Glen Nilsen, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected], www.arrow.altech.co.za
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