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Super Fine TFT Technology
Jul 06, 2017

Excellent viewing angle specifications

In LCD specifications the viewing angle refers to the maximum angle at which images can be viewed at an acceptable contrast ratio(*1), such as 10:1. This angle is expressed as degrees (from the line perpendicular to the center of the screen). Since the contrast ratio is the only defining factor for image quality, an LCD can claim an 80-degree viewing angle even if the colors look completely different than when viewed from the front. Moreover, images on two LCD panels with the same maximum viewing angle but different LCD drivers can look very different when viewed from an angle.

sft_tn_display.gif

An LCD varies the amount of light passing through the screen by applying voltage to liquid crystal molecules sandwiched between two polarizing plates and by changing the alignment and direction of the molecules. Many LCDs apply voltage in the vertical direction, which rotates the liquid crystal molecules vertically. But SFT displays apply voltage in the horizontal direction, which rotates the molecules horizontally. The amount of rotation depends on the voltage level and is used to vary the amount of light penetration. When the liquid crystal molecules are fully horizontal, their size appears identical regardless of the angle from which they are viewed. The difference in brightness and color at different viewing angles is therefore smaller with SFT displays than with conventional LCDs.

(*1) The contrast ratio represents the contrast between the maximum brightness (white screen) and minimum brightness (black screen) in environments lacking any ambient light.

sft_lcm.jpg

SFT is an abbreviation for Super Fine TFT.


Smooth moving images

Liquid crystal molecules tend to rotate more smoothly in the horizontal direction than the vertical direction. Since SFT LCDs enables display by rotating liquid crystal molecules horizontally, their response time is relatively fast, regardless of the magnitude of shift in gray scale. Moving images are also displayed very clearly because there is no sudden drop in response time between intermediate gray scales. There are no other technologies where liquid crystal molecules rotate vertically.

応答速度

  • Spec Chart Response Time
    (sum of yellow-circled figures)

    Although this is one indicator of LCD response time, it does not include the response time between intermediate gray scales.

  • Response Time Between Intermediate Gray Scales
    (shown by the orange circle)

    Since most moving images consist primarily of changes between intermediate gray scales (even when the response time in the specifications is fast), if theresponse time between intermediate gray scales is slow, then the images may appear smeared.

SFT is an abbreviation for Super Fine TFT.


Consistent high luminance and wide color gamut

High luminance and wide color gamut are both essential elements to achieve high LCD image quality. Until recently, however, one was possible only at the expense of the other. Generally, LCD color representation is achieved through a combination of color filters and light source. An expansion in the color reproduction range (color gamut) can be attained by using color filters with thicker colored films. However, luminance declines if the color filter is combined with the backlight system, since LCD panel transmissivity decreases.

Tianma Japan offers users both high luminance and wide color gamut in every LCD we produce - and the improved color performance that goes with them. The key breakthrough came as a result of the improved transmissivity achieved by our SFT technology.
Thus, a wide color gamut exceeding 70% the color gamut of NTSC is possible, without sacrificing luminance, for products intended for applications requiring accurate color reproduction. The clear, vivid color reproduction stands up to the toughest professional standards in applications including broadcasting, graphics and medical use.

Note: In monochrome products and other products intended for fields not requiring a wide color gamut, improvements in transmissivity based on SFT technology are being applied to achieve higher luminance.

Product Photos Product Photos

SFT is an abbreviation for Super Fine TFT.


Consistent high luminance and high definition

As the demand for LCDs spreads to new and different applications, user needs grow more diversified and sophisticated. In healthcare, for instance, a new generation of doctors is turning to IT in their efforts to make more informed, accurate diagnoses. With this new trend, the role of digital displays has become more pivotal than ever in medical applications - with increasing demand for higher image reproduction.

To realize the high 3 megapixel-plus definition and smooth, precise gray scale characteristics demanded by applications for reading chest X-rays and mammograms, a luminant dynamic range and gamma characteristics independent of viewing angle are absolute prerequisites. Tianma Japan addresses the exacting demands of these and other medical applications by offering ultra-high definition without sacrificing high luminance, thanks to the clear visibility of SFT technology.

Product Photo

SFT is an abbreviation for Super Fine TFT.


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