The PLUTO-2 phase only Spatial Light Modulator (SLM) consists of a driver unit with standard digital video interface (HDMI) and a phase only LCOS (Liquid Crystal on Silicon) microdisplay with full HD resolution (1920 x 1080 pixel) and 8 Âµm pixel pitch leading to an active area diagonal of 0.7â with aspect ratio of 16:9.
The PLUTO-2 SLM is a plug & play phase modulator device and can be addressed with phase functions via standard graphics cards as an extended monitor device. The green color channel of the video signal is used for addressing 8 bit gray level patterns (the SLMs native resolution need to be addressed). Addressing can be done using the supplied Pattern Generator software or the SLM Slideshow Player software or standard image viewer software. HOLOEYE also provides an SLM Display Software Development Kit (SDK) which provides APIs (Application Programming Interface) for different programming languages.
HOLOEYE offers different display versions that can be driven with the PLUTO driver unit. The different panel versions are optimized for the use at different wavelength ranges and different applications. All versions use fast full digital addressing which assures high reliability and a compact driver unit as basically only two voltages need to be generated.
The PLUTO-2 driver uses an HDMI interface for addressing phase functions and an USB connection to communicate with the driver (to changing the voltage vs. gray level distribution (gamma control) and dynamic range (voltage across the LC cell) in order to calibrate the SLM for different wavelengths). Besides this the driver features a trigger sync output to synchronize the device with external devices.
The PLUTO-2 driver also features a dual-core ARMÂ® Cortexâ¢-A9 processor which also includes on-chip memory. This enables the user to program additional functionality which is directly processed on the PLUTO-2 device (e.g. a slideshow from images which are loaded from USB flash or from internal memory). The dual-core system runs an embedded Linuxâ¢ SMP operating system and includes a library which provides full control and supervision of the display and driver board. The PLUTO-2 provides access through Serial and Ethernet-over- USB2 (RNDIS) interfaces and can be programmed using standard Ubuntuâ¢ cross compile GCC toolchain.
The standard PLUTO displays show a reflectivity of approx. 65%-95% (dependent on version) and diffraction efficiencies of more than 80%. Thereby a total light efficiency of more than 50% per addressable diffractive device is possible.
|PLUTO Spatial Light Modulator â Microdisplay Features|
|Display Type:||Reflective LCOS (Phase Only)|
|Resolution:||1920 x 1080|
|Pixel Pitch:||8.0 Âµm|
|Fill Factor:||93 %|
|Active Area||15.36 x 8.64 mm (0.7â³ Diagonal)|
|Addressing||8 Bit (256 Grey Levels)|
|Signal Formats||DVI â HDTV Resolution|
|Frame Rate||60 Hz|