Edge techniques (optical)

Surface techniques (electrical/acoustic)

Lumio

Infrared matrix

Resistive

Capacitive

Acoustic

Screen overlay required

No

No

Yes

Yes

Yes

Transparency

92-100%

92-100%

75-85%

85-92%

85-92%

Colour fidelity

High

High

Low

Low

Low

Full frame bezel required

No

Yes

Yes

Yes

Yes

Detection/Display area

up to 100"

up to 100"

up to 25"

up to 25"

up to 40"

Sampling rate

400 Hz

50 Hz

100 Hz

20 Hz

100 Hz

Resolution

High

Low

High

High

High

Accuracy

High

Low

Low

Moderate

Low

Drift (Temp. Aging)

No

No

Yes

Yes

Yes

Latency

10 mSec

100 mSec

10 mSec

50 -100 mSec

20 mSec

Scalability to large areas

Yes

Yes

No

No

No

Cost

Low

High

Low cost (for small sizes)

Moderate

High

Sensitivity

ambient light

ambient light

Very sensitive to scratch

Sensitive to dirt

Sensitive to scratch

Support for multiple events

Yes

Yes

No

No

No

Advantages

Low cost, Superior image, high resolution (3 to 16 million points), can be scaled to almost any size, can detect almost any object

No overlay, Superior image, can detected any object which blocks

Low cost (for small sizes), can detect any object

Moderate cost, good in harsh environments

Can be deployed to a curved surfaces

Disadvantages

Expensive, detection placed above screen and sensitive to ambient light

High costs for large areas, very sensitive to scratch, low fidelity and reduces the visibility of the screen

Finger activation only, reduces illumination, finger must stay in position for detection so no movement

Delicate, expensive and sensitive to scratch