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Positive Mode Transflective Display |
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Negative Mode Transmissive Mode |
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This display is a Positive Mode Transflective Display. This display works in a reflective mode but also transmits light from a backlight for viewing conditions with poor external lighting.
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This is a Negative Mode Transmissive Mode example that we produced.
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High Twisted Nematic (HTN) |
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HTN (High Twisted Nematic) displays are based on a higher molecular twist (usually 110') than TN (90') and therefore offer wider viewing angles and improved contrast. In fact, these HTN products offer viewing characteristics close to those of STN technology. As low operating voltage as 2.5V and marginal extra cost over TN means that the products are well suited to hand-held applications. |
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Reflective HTN display
This is a Reflective HTN Display. It has good contrast but needs external light for viewing. |
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Super Twisted Nematic (STN) |
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STN (Super Twisted Nematic) is a high information content LCD that uses adjustable interference of two optical modes to achieve a large number of multiplexed lines, higher contrast and higher level of grayscale. It results in the birefringence mode. An improved twisted nematic fluid (200' twist or greater) which has better contrast and optimum viewing range than standard twisted nematic. |
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Yellow Mode STN Display |
Blue or Negative Mode STN Display |
Gray Mode STN Display |
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This is a Yellow Mode STN Display. The background is yellow and the segments are dark blue. This display can be produced in a Reflective Mode Technology or Transflective Mode Technology to utilize a backlight for poor lighting conditions. |
This is a Blue or Negative Mode STN display. The background is always blue. This display technology requires a backlight to be on at all times. |
This is a Gray Mode STN display. This display has a dark blue character on a gray background. The way we convert this display from the Yellow STN Technology to the Gray is by using a purple polarizer in the front surface of the glass. |
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Film Compensation Super Twisted Nematic (FSTN) |
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FSTN (Film Compensation Super Twisted Nematic) is an LCD with an extra film added to the outside of the cell to compensate the color shift of blue on green to black on white. The film is made of a polymer with double refraction to remove the interference of colors. It results in retardation compensation. The film (the top layer in the figure) is placed in the display, either under or over the top polarizer. Some film compensation systems use two films, one on the rear that serves as a collimator, and one on the front that serves as a dispersion film to broaden the viewing cone. Film compensation improves the viewing angle, but does not affect switching time. FSTN is all standard STN displays with a polymer film applied to the glass as a compensation layer instead of the second cell as in the case of the DSTN. This simpler and more importantly cost effective method provides the preferred black on white image for this display technology.
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