Low Resistance Transparent Conductive Film - Touch Panel
(The following spec. is an example. We can custom produce your product.)

ETAFILM is targeting at low resistance touch panel ( < 20 ohm) . Now we developed two substrate (Glass and PC (polycarbonate)) conductive film coating.

 

Glass Transparent Conductive (ITO) Coating:
This conductive touch panel is base on the traditional optical glass substrate. Using Thermal E-gun evaporation (PVD) coated with target material of Indium Tin Oxide (ITO). Although most producers adapted Magnetron Sputtering Deposition which can produce large substrate and with low cost. But the resistance of magnetron sputtering is high (above 200 ohm). For some special usage, low resistance conductive film is required. The E-gun thermal evaporation can produce such low resistance conductive film in spite of the substrate size is limited and expensive than Magnetron Sputtering.

Electric and Optical Characteristic

Resistance (Ω/□ )	Resistance Uniformity (%) (Note 1)	Color Coordinate	Transmittance at 550nm (T%)	Tave(%) at 400-700nm	Film thickness (nm)	Available Sample size(mm)
20+/-2	<= 10%	** (Note 2)	>= 83.5	>=83.5	>50	80*88*0.3
<10	<=10%	**	>=83.5	>=83.5	>200	80*88*0.3
<3	<=10%	**	>=80	>=80	>400	80*88*0.7
<3	<=10%	**	>=80	>=80	>400	110*110*1.1

Note1: Resistance uniformity % = (Rmax-Rmin)/Rave*100%
Note2: Defined by customer

Chemical and Physical Characteristic

NO	Test Item	Standard	Inspection Method
1	Chemical resistance in NaOH	Change of sheet resistance ≤10% and change in appearance visible with eye under normal illumination	Treatment in sodium hydroxide conc. 2 % at 40oC for 10 min. with ultrasonic agitation.
2	Adhesive tape test	No peel off	MIL-M-13508 4.4.6. check appearance with unaided eye under normal illumination
3	Humidity Stability	ΔR ≤ 10%	Measure the resistance (Rbefore), treatment in 60+/-2 oC and 90+/-5% RH (thermal chamber/HMO-2), for 24 hours. Measure the resistance after environment test (by 4-point probe). ΔR(%) = ((Rafter – Rbefore) / Rbefore) x 100%
4	Temperature stability (change of resistance)	ΔR ≤ ±15%	Change of sheet resistance after a temperature cycle
5	Effective area	The effective area (critical area) is defined as the total substrate area less a 10mm border.

PC (Polycarbonate) Transparent Conductive Film Coating:
This conductive touch panel coating is base on optical PC (polycarbonate) substrate.Traditional substrate of conductive film coating is optical glass. ETAFILM developed unique PC substrate coating. The superiority of PC is its un-fragility. This make PC substrate has broader usage opportunity.

Electric and Optical Characteristic

Resistance (Ω/□ )	Resistance Uniformity (%) (Note 1)	Color Coordinate	Transmittance at 550nm	Film thickness (nm)	Available Sample size(mm)
400+/-100	<= 10%	b*<= 2.0	>= 87	15+/-5	310*440*1.0 310*440*1.2

Note1: Resistance uniformity % = (Rmax-Rmin)/Rave*100%

Chemical and Physical Characteristic

NO	Test Item	Standard	Inspection Method
1	Chemical resistance in NaOH	Change of sheet resistance ≤10% and change in appearance visible with eye under normal illumination	Treatment in sodium hydroxide conc. 2 % at 40oC for 10 min. with ultrasonic agitation.
2	Adhesive tape test	No peel off	MIL-M-13508 4.4.6. check appearance with unaided eye under normal illumination
3	Humidity Stability	ΔR ≤ 10%	Measure the resistance (Rbefore), treatment in 60+/-2 oC and 90+/-5% RH (thermal chamber/HMO-2), for 24 hours. Measure the resistance after environment test (by 4-point probe). ΔR(%) = ((Rafter – Rbefore) / Rbefore) x 100%
4	Temperature stability (change of resistance)	ΔR ≤ ±15%	Change of sheet resistance after a temperature cycle
5	Bend test	Bending curvature radius <150mm	Check the resistance to cracking of attached material coatings on substrates of sheet plastic. Change of sheet resistance <=10%.
6	Effective area	The effective area (critical area) is defined as the total substrate area less a 10mm border.