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GIGAVision Technology

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Sunlight Readable LCD

First, the display screen on a sunlight readable LCD should be bright enough so that the display is visible under strong sunlight. Second, the display contrast ratio must be maintained at 5 to 1 or higher.

You may find that a display with < 500 nits brightness and a lower contrast ratio can still be visible under outdoor environments, however, the display quality is significantly poor. Sunlight readable LCD is typically considered to be an LCD with 1000 nits or higher brightness with higher contrast ratio. In outdoor environments under the shade, such a display can provide an excellent image quality.

We always mentioned transflective TFT LCD with sunlight readable capability.  A transflective LCD is  capable in reflecting and transmitting light (transflective = transmissive + reflective). When exposed to daylight, the display acts mainly as a reflective display with the contrast being constant with illuminance. The essential component for a transflective LCD is the transflector, a polymer sheet that is reflecting and transmitting at the same time

However, transflective type of TFT LCD is not commonly available and resluted for higher price and less in commericial flexibility. Transflective TFT LCD is relatively lower demand and thus TFT sizes and resolution for transflective is very limited. Problems noticed in transflective LCD include narrow viewing angle, discoloration, low brightness, and loss in contrast.

Optical Bonding Technology

This is one of the most preferred technology for product enhancement. Optical Bonding process provides a significant reduction of ambient light reflections at an affordable price. This technology provide sunlight readability and extra vandal resistance for outdoor viewing flat display panel.

Optical Bonding Technology affixes a cover lens, such as anti-reflective glass, plastic, or touch sensor directly onto a flat panel display and eliminates the air gap between, in order to reduce the reflectance to as low as 0.2% and dramatically increase contrast ratio in a high ambient light environment.

This technology also allows product ID designer and mechanical engineer to design a larger cover lens or leave out front bezel for less total thickness, rather than the traditional bezel design. Optical bonding seals either a top cover glass or touch screen directly to the face of the display bezel.  Optical bonding also enhances structural integrity by supporting the LCD assembly with the cover glass.  The bond maintains perfect display uniformity while providing shock protection, unlimted humidity protection, and elimination of fogging caused by trapped moisture accumulating in typical air-gap assemblies. 

Optical bonding eliminate reflections of 2 surfaces

TFT LCD sizes of Optical Bonding (high brightness)

Comparison Picture
(1) Laptop LCD : 200 nits/Transmissive
(2) Mobile phone : 200 nits/Transflective
(3) 7″ TFT LCD : 600 nits
: AR Glass Optical Bonding
: Transmissive

Field Sequential LCD (FS-LCD)
True Black Negative (TBN)
Area Colour Negative (ACN)