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OCR Overview


UV-thermal type OCR

    Introduction to UV-thermal type OCR

Application - Attaching cover glass to display panel.
- Attaching touch panel to display panel.
- Attaching cover glass to display panel.
- Attaching touch panel to display panel.
Bonding
process
• UV-thermal curing method
    Thermal curing condition : 55℃, 30min

• UV-thermal hybrid curing method
    Pre-curing : 800mJ/㎠ (365nm, LED lamp)
    Final-curing : Auto clave(60℃, 15min)

Advantages - Able to fully cure the light-blocked area.
- Guarantee the curing ratio under the black matrix(over 90%).
- Able to fully cure the light-blocked area.
- Guarantee the curing ratio under the black matrix(over 90%).
- After UV pre-curing, the total area can be cured by auto-clave process(thermal curing).

    Specification of UV-thermal type OCR

▣ MRH5540D(UV-thermal type OCR): Low dielectric constant and high adhesive shear stress.
▣ MRH4860DH(UV-thermal(Hybrid) type OCR): Low dielectric constant and high adhesive shear stress

Item Unit Reliability Test UV-thermal UV-thermal(Hybrid process)
MRH5540D MRH4860DH
Curing dosage (@90%) mJ/㎠ - 350 -
Curing dosage (@95%) mJ/㎠ - 450 -
Thermal curing time (70℃/5min) % - 91.7 -
Pre-curing dosage(LED 365nm) To glass mJ/㎠ - - 800 ± 100
To pol mJ/㎠ - - 1300 ± 100
Thermal curing time after UV cure (@70℃) min - - 10
Viscosity cPs - 4,400 8,200
Refractive index - - 1.48 1.47
Density g/cc - 0.9520 0.8977
Density g/cc - 0.9868 0.9321
Shrinkage % - 3.53 3.69
Hardness - - 92 57
Modulus Pa - 1.68E+06 1.8E+05
Adhesiveshear strength Glass to glass Pa 0 hr 1.0E+07 1.2E+06
500 hrs 1.6E+07 1.9E+06
Glass to pol 0 hr 3.5E+06 1.0E+06
500 hrs 7.8E+06 1.9E+06
Flexural Strength N/㎠ 0 hr 14.46 -
500 hrs 18.04 -
CTE (above Tg) ppm 0 hr 640 640
500 hrs 750 710
Dielectric constant - 0 hr 2.25 2.85
500 hrs 2.54 2.44
Refractive index - - 1.48 1.47
transmittance % 0 hr 99.99 99.5
500 hrs 99.35 99.2
Haze % 0 hr 0.02 0.02
500 hrs 0.01 0.37
Yellowish - 0 hr 0.06 0.02
500 hrs 0.1 0.23
- 0 hr 0.01 0.01
500 hrs 0.01 0.01
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