Reduce reflectivity and improve visibility with Gunze’s patented technology
An ideal choice for applications operating in direct sunlight and where power consumption is critical:
Light reflection is one of the major factors that can considerably lessen the visibility of LCDs. As a pioneer in the touch panel industry, Gunze has developed a proprietary Indium Tin Oxide (ITO) low-reflective layer that improves touch panel transparency. The ITO layer allows light to pass through the horizontal surfaces with little or no reflection.
Gunze low-reflective touch panels employ anti-reflection film and polarization to minimize reflection.
Surface light reflection is lowered by a layer of anti-reflective (AR) film composed of multiple transparent materials, each of which has a different light reflection rate. The film coherently adds an amplitude of light reflection at the film boundaries, reducing touch panel light reflection by as much as 10%. AR film reduces reflection by controlling the amplitude and phase of light waves.
Note: Coherency is a condition in which the wave phases of light waves synchronize with each other.
In addition to AR film, Gunze touch panels utilize polarization, which reduces reflection even more. A polarizer is a type of light isolator that reduces reflective light from inside the touch panel.
Note: An optical isolator is a component of a light element circuit that has a pair of input/output terminals. It is a passive optical component that passes light only in a designated direction, letting light in with minimal loss while greatly reducing output light.
Materials such as glass that are optically equiangular and therefore have no complicative light refraction are covered with the polarizer, which replaces the standard polytelephthalate (PET) layer. Gunze’s innovative resin-based light refracting material offers superior reflection reduction.
The circular polarizer converts certain linear light waves (such as 550 nm) to circular light. A linear polarizer and 1/4 retardation sheet form an adhesive layer. Linear light and circular light can be combined in a clockwise or counterclockwise direction, crossing each other squarely, with one type of crossing being transparent while the other is not.
Light from inside the touch panel is absorbed by the circular polarizer. Because the transparency of light absorbed by the polarizer is reduced, the circular polarizing sheet attached to the surface of the LCD has a 1/4 retardation rate, enabling the required transparency.
Anti-reflection (AR) treatment to the surface of the touch panel is a highly effective means of reducing light reflection.
A single layer of AR film affects only a narrow range of visible light waves; multiple layers of AR film prevent light reflection in a broad range of light waves.
Gunze’s AR technology now makes it possible to manufacture touch panels with low reflection that are also highly durable and that can utilize both pen and finger input.
Gunze’s AR technology prevents light reflection on the surface, with a high transparency rate. With standard touch panels, the AR coating is placed on the upper electrode film. With low reflective touch panels, the AR coating is on the polarizer.
