Light Valve Target Specifications
- Resolution : 2560 x 2048 (GXGA or QSXGA)
- Pixel pitch : 15 µm
- Aperture ratio: > 85%
- Overall reflectivity > 50% for polarized light
- Response time: 20 ms
|
15 cm wafer containing 4 GXGA active matrix chips
|
Fabrication & Technology
Light Valve technology : Liquid
Crystal on Silicon (LCOS)
Si process: Alcatel Microelectronics 0.7
µm CMOS with HV extensions
Lithography : Stepper (field size 20 mm)
+ stitching
Back-end process : Planarization + light
shielding + mirror electrodes
Mirrors : Glossy aluminum, 89%
reflectivity
|
Micrograph of individual pixel electrodes (15µm pitch,
0.7µm spacing,; AR > 90%)
|
Driving Electronics
Pixel addressing : Analog active
matrix (DRAM type)
LC voltage range : up to 4 VRMS
Max. gate swing on pixel transistor : 12
V
Row driver : line per line select
Column driver : analog, 16-fold
parallelism
|
Integrated drivers
|
LC-Technology
2 LC-effects are considered :
- RTN (Reflective Twisted Nematic)
- DAP (Deformation of Aligned Phase)
Multi-device assembly compatible with existing
production equipment
|
Optical response curve
|
Demonstrators
1) Projection monitor (Barco)
Target Specifications
- Full colour
- Screen size : 70 cm to 1 m, perfectly flat
- Reduced depth and weight
- Screen luminance: 200 Cd/m2
- Contrast : 100:1
- Number of grey scales : 8 bit or analog
2) HUD (Head Up Display) (Sextant-Avionique)
Target Specifications
- Brightness: >10000 Cd/m2
- Field of view: 30°x20°
- Resolution: 1 mrd
Head-up display mock-up
|
Side view of rear projector optical
system
Rear projection workstation display
|
Other possible applications:
Projection-type :
Business projectors, projection monitors, home
theatre, HUD for avionics and automotive
Viewfinder type :
Consumer (camcorder, games), GSM, VR headsets
|
|
