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Confidential
13 November 2015 TP Vision Innovation Site Europe - Sensor function team
Polymer light guides for slim sensor TV integration
Confidential
Idea
• Thinner TV sets puts severe pressure on the way optoelectronic sensors can be integrated.
• Further sensor miniaturization and subsequent integration in the TV framework (bezel) will be an asset and creating opportunities for unique designs.
• Therefor we developed an optical interface in the TV framework, that is connected by light guides to the main PCB, where the optoelectronic sensors are assembled in a more conventional way. The use of flexible light guides for combined sensor functions is unique within this consumer segment.
• The solution has landing opportunity allowing for scalable solutions regardless of screen size or mechanical design into the full Philips TV product range.
Confidential
Main
processing
board
(1) Sensor deco window, front finishing
(2) Sensor mechanical carrier (few parts for assembly)
(3) Sensor board
(4)(4’)(4’’) 2 connectors and Cable
(3) Sensor board with sensors
(2) Plastic sensor window dimensions
(1) Sensor window
Design front part
TV SET
(4’) Cable
Example of a current architecture
(4’’) Connector
(4) Connector
Confidential
Main
processing
board with
Sensors
integrated
(1) Front fixation
(2) Flexible Light guide
(3) Light guide Interface
TV SET
(2) Light guide
(1) Front fixation for the transparent Light guide window
directly in contact with the environment
(no assembly part or deco needed)
(3) Interface
Target architecture
Confidential
Technological feasibility study relating to the micro-plastics
• The use of polymer light guides for sensor integration in a TV set. – Integration requirements (TP Vision)
• The light guides solution needs to combine 3 parts: – Polymer wave (light) guide (UGent CMST)
– Polymer-based light coupling units (VUB B-Phot)
– Mechanical moulds and components (Sirris)
• The sensor functions should perform within the given specifications for TV. – Validation (TP Vision)
• The light guide solution should fulfill the quality/requirement specification for TV. (TP Vision)
• The solutions proposed should be within the cost budget. – All (Ongoing)
Confidential
UGent CMST: Polymer waveguide fabrication
• Fabrication of polymer waveguides and light guides on rigid, flexible and stretchable substrates
• Laser technology for fast prototyping
– E.g. cutting out polymer sheets with precise dimensions
Rigid
Flex
Stretch
Confidential
• Optical modelling and raytracing of coupling structures
to optimize light coupling between light guide and transceiver
• Fabrication in metal mould using Ultraprecision Diamond Tooling
• Hot Embossing of optical microstructures in PMMA
Ultraprecision Diamond tooling Hot Embossing
Tigran
Baghdasaryan
Heidi
Ottevaere
VUB B-Phot: Polymer-based light coupling units
Confidential
Sirris Microfabrication Application Lab
Mechanical design
Prototyping of mechanical
components
(+ cost model)
Direct machining of
optical components
(+ associated metrology)
CA
D
resso
urc
es
Ste
reolit
hogra
phy
Mic
ro-m
illin
g
Confidential
- Main Contribution
Mechanical design
Prototyping of mechanical
components
Direct machining of
optical components
(+ associated metrology)
Ste
reolit
hogra
phy
Main Facts & Figures
Laser beam: 75 µm
Layer thickness: 25-50 µm
Wall thickness: 100µm
Accuracy: +/- 100 µm
Confidential
Sirris Microfabrication Application Lab
Mechanical design
Prototyping of mechanical
components
(+ cost model)
(+ associated metrology)
Mic
ro-m
illin
g
Main Facts & Figures
Direct machining of
optical components Minimum feature size: ~30 µm
Surface quality (PMMA):
- 0,2µm Ra (raw)
- a few tens nm Ra (polished)
Confidential
ISE TPVision Test set-up using the Light guide solution
Front vision light guide through slit
90° bending light guide through slit
Complete assembly
light guide
Electrical board
Mechanical interface
