Virtual input device with diffractive optical element

Ching Chin Wu; Chang Sheng Chu

doi:10.1117/12.570303

7 February 2005 Virtual input device with diffractive optical element

Ching Chin Wu, Chang Sheng Chu

Proceedings Volume 5636, Holography, Diffractive Optics, and Applications II; (2005) https://doi.org/10.1117/12.570303
Event: Photonics Asia, 2004, Beijing, China

Abstract

As a portable device, such as PDA and cell phone, a small size build in virtual input device is more convenient for complex input demand. A few years ago, a creative idea called 'virtual keyboard' is announced, but up to now there's still no mass production method for this idea. In this paper we'll show the whole procedure of making a virtual keyboard. First of all is the HOE (Holographic Optical Element) design of keyboard image which yields a fan angle about 30 degrees, and then use the electron forming method to copy this pattern in high precision. And finally we can product this element by inject molding. With an adaptive lens design we can get a well correct keyboard image in distortion and a wilder fan angle about 70 degrees. With a batter alignment of HOE pattern lithography, we’re sure to get higher diffraction efficiency.

Citation Download Citation

Ching Chin Wu and Chang Sheng Chu "Virtual input device with diffractive optical element", Proc. SPIE 5636, Holography, Diffractive Optics, and Applications II, (7 February 2005); https://doi.org/10.1117/12.570303

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