NVD shows off ultra-slim PMVA color display based on Corning Willow Glass
New Vision Display and Corning exhibited an ultra-slim glass Passive Matrix Vertically Aligned (PMVA) color display based on Corning Willow Glass at the Society for Information Display’s (SID) Display Week 2013, May 21-23, in Vancouver, Canada. The display featured two Willow Glass substrates and retains the excellent surface and optical properties of thicker glass, while enabling a significantly thinner and lighter display. The demonstration was based on a smart meter market application, but this display is suited for all applications where “thin” is an advantage and standard TFT displays are too costly. “The display was fabricated on a standard LCD production line using NVD proprietary carrier technology, thus allowing the use of existing infrastructure. However, the processes we used to make the display are totally compatible with future roll-to-roll manufacturing,” said Dr. Matthias Pfeiffer, CTO of NVD. Roll-to-roll (R2R) display manufacturing could lead to extremely low cost, high-performance displays for a variety of applications. NVD’s demonstration display shows that cell gap uniformity and flexible glass handling challenges can be overcome. For this demonstration, NVD chose advanced technologies (PMVA and field sequential color addressing) to demonstrate the technical capabilities of Corning’s Willow Glass.
The display has excellent contrast and image quality and featured a cut-off backlight and polarizers so that visitors could see the thinness of the glass at one of the display’s corners. 100μm nominal (actual 125μm) Willow film glass has been used for the exhibition pieces. The display type was a field sequential color, passive addresses vertically aligned LCD. The purpose of the demonstration, besides the exhibition, was to demonstrate that Corning Willow glass can be used to produce film glass displays on a standard passive LCD production line with minimal process adjustment. NVD modified the layout of an existing product for the demonstrator, but otherwise used the same production tooling, materials (LC fluid, PI, spacers, adhesives, etc.) and processes to manufacture the display on its Shenzhen, China Gen 2 production line. The film glass was mounted on a 0.55mm carrier to achieve the required stiffness for substrate handling on a line that is designed to accept 0.4mm to 1.1mm glass substrate thickness. Mounting and de-mounting was done manually for the demonstration and would be automated for high volume production. Since display manufacturing includes all required process steps to fabricate capacitive touch sensors the same approach can be used for capacitive touch sensors based on Corning Willow film glass.