Pong Lai

Fabrication of a large F-number lenticular plate and its use as a small-angle flat-top diffuser in autostereoscopic display screens

A diffuser with large horizontal and vertical diffusion angle is a key component for the screen of a projection display. On the other hand, an autostereoscopic projection display needs a small horizontally diffused and large vertically diffused diffuser. A commercial LSD composed of cylindrical-based grains can be used to meet this requirement. Nevertheless, as the diffused intensity profile of a LSD is Gaussian-like, a LSD in many cases can cause either ghost imaging or black stripes while applied to the screen of autostereoscopic displays. Lenticular plates can produce a near flat-top diffusing profile when the divergence angle is small. For example, a lenticular plate with a 5 degrees divergence can be shown in theory to have only a 2.1 percent non-uniformity. However, as the curvature of the lenticular is very small, it becomes very difficult to fabricate such a lenticular plate. This paper reports a novel approach to modify a lenticular plate that was originally with a large divergence angle to a plate with a desired smaller divergence angle, without destroying the surface quality and maintaining good uniformity. The lenticular plate fabricated by using this approach was used as a screen diffuser of a projection-based autostereoscopic display, and the luminance of the screen viewed from different angles was measured.

P-184: Novel Diffuser for LCD Backlight Application

A plastic diffuser with high-aspect-ratio surface profile for application of LCD backlighting is proposed. It can diffuse light uniformly into wider angle than that from a conventional bead-embedded diffuser. The diffusion power of the proposed diffuser and the fabrication processes are also presented.

P‐83: Side‐emitting LED for Ultra‐Thin Direct LED Backlight

A LED direct backlight system with ultra-thin thickness by employing side emitting LEDs is proposed. The lens cap on the LEDs is with metal reflection coating to re-direct the light to emit from the side of LED. Prior to this method, the light mixing cavity of a LED Backlight module is thicker than 50mm for obtaining uniform illumination. By using the proposed LED package, a 30mm thick light mixing cavity of a 32″ LED backlight is realized. The simulation and experiment of the illumination performance are also demonstrated.

New fabrication for DSRRs nanostructure in optics

The Deformed-Split-Ring Resonators (DSRRs) require metal nanostructure on high transmission material substrate for optical application. In this article, a simple method of fabricating three- dimensional polymer nanostructure that use an UV-curable polymer as the resist is discussed. Because UV cure imprinting has high resolution which is about 100nm and high transparency, it is ideally suited for photonic and meta-material optical device applications. The fabrication combines several mass production technologies. The first one is photolithography, such as a stepper UV exposure system can make the nano scale pattern in photoresist, the second is to change the photoresist sample to become the nanoimprint mould by precise electroforming, the third is to use UV cure imprinting to transfer the DSRRs pattern on the UV-curable polymer. Finally, it is also the most important process is that to coat metals and metal lift-off that coating Ag to become buffer layer by sputter, then coating Au into the nanostructure and lift off Ag by HNO3. The DSRR structure is implemented in high transmission UV-curable polymer with Au.

Au/Cr/IZO thin film electrode for application of thermal controllable waveguide devices

A Au/Cr/IZO composite thin film for application of thermal electrode of the waveguide devices is proposed. It can be fabricated easily on the glass-based waveguide devices by sputtering deposition process. The hardness and impedance properties, as well as its adhesion with the glass substrate are investigated in this study.

Holographic apparatus for forming nanograting device

This paper studies the fabrication of the nano-scale grating using laser beam interference. The beams come from a He-Cd laser @442nm were interfered with each other inside a prism, and form the interference pattern on the photoresist layer that coated on the bottom of the prism. The method can fabricate gratings with period that less than the half of the wavelength of the interference laser beams. It becomes a promising process that can fabricate a grating with periods of 160nm without using UV light source. The experimental result is also demonstrated.