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More about RT-TrioLCD™: Transflective resistive touch LCD: sunlight readable
All surfaces reflect to the ambient light, more or less. However, this common property of all surfaces become a real concern in outdoor devices with a resistive touch integrated display for that the total reflection of a resistive touch integrated display would reach as high as 20%. Newly developed high transmission touch (~96% transmission, expensive!) reduces the reflection to about 4%. Unfortunately, 4% reflection of the surface of a regular display without any resistive touch is enough to wash out the contents of the display not to mention the additional 4% or 16% introduced by the overlaid touch. Though the resistive touch could be a popular option for smaller portable devices, especially units with a display under 10.4", due to its cost and light weight, these adavantages are practically off set by it enomous glare in the outdoor enviroments.
The introduction of our TrioLCD in 2002 really offered a superior solution to many portable devices, such as rugged notebook, which can be made direct sunlight readable. However, we recogonized that the transflective property introduced into the LCD is greatly compromised when the enhanced LCD is overlaid with a resistive touch. We hence devotedsome of our R&D effort into finding a solution for units that would need to have resistive touch panel and longing for a anti-glare and anti-reflection LCD and touch panel integration technology and hopefully a new product for the display industry, which certainly came along in 2005 - we submitted a patent and started to manufacture a new series of product RT-TrioLCD.
The RT-TrioLCD integration technology is a result of a full understanding of the changes in optical property of a traveling light wave through various media and surfaces. This understanding allows us to generate an innovative way of integration for TrioLCD and a resistive touch, which eliminates majority of the unwanted reflections yet allow the effective reflection of a TrioLCD to be delivered to viewer's eyes. As a result, our sunlight readable resistive touch
integrated LCD, RT-TrioLCD, is with a sunlight
reflectance of <1% (Fig. 1) and is similar to the original TrioLCD (Transmissive and Reflective Illumination Optimized LCD) - being transflective.
Thus, although the transparency of the touch
panel is ~75% (at wavelength
550nm), it possesses a superior sunlight readability to a high transmission resistive touch panel due to the its transflective property.
Figure 1 -
Reflectance of Ambient Light on LCD with Various Resistive Touch Screens |
Fig. 2 shows a 15" notebook screen
divided into areas A, B, and C, where A is a LCD area overlaid with a regular resistive touch, B is an area made into TrioLCD, and C is an area made into RT-TrioLCD. Indoors, all areas are viewable.
Figure 2 - Indoor readability of screen areas A - regular touch, B - RT-TrioLCD, and C - RT-TrioLCD |
However, outdoors, under
conditions of both shade (Fig. 3) and direct sunlight (Fig. 4), only
areas B and C, which are TrioLCD and RT-TrioLCD , are readable.
Figure 3 - Readability under the shade: screen areas A, B, and C in the shade |
Figure 4 - Outdoor
readability of screen areas A, B, and C under direct sunlight |
We invite you to experience for yourself
the remarkable effects that TrioLCD and RT-TrioLCD can have on the outdoor readability of your displays. Once again, we
would like to thank our customers for their continued support and
patronage.
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