The performance of an inspection system for indium tin oxide circuits by using a PDLC/ITO film

Chan, C.-H.; Zou, Yong-Tong; Chen, C.-T.; Liu, T.-K.; Chen, C.-H.; Wang, H.-W.; Lin, S.-C.

doi:10.1117/12.2035682

Cited by 1 publication

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“…First, we theoretically calculate the parameters affecting the operating voltage of the inspection instrument. Although there is previous literature about calculating the operating voltage of a PDLC, there the PDLC module was in contact with the transparent electrode [12,13]. However, as described above, the TSP electrodes should be away from the PDLC module, due to the bezel structure at the boundary of the TSP (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Although there have been several reports about the application of PDLC to the inspection module [12,13], the high operating voltage of the PDLC has not been completely resolved. Generally, the switching voltage needed to obtain the transparent state of the PDLC is very high: over 30 V, when the PDLC is sandwiched between ITO glasses with a cell gap of 10 µm.…”

Section: Introductionmentioning

confidence: 99%

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Operating Voltage of Optical Instruments based on Polymer-dispersed Liquid Crystal for Inspecting Transparent Electrodes

Yeo

Lee

2017

Current Optics and Photonics

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Optical instruments based on polymer-dispersed liquid crystal (PDLC) have been used to inspect transparent electrodes. Generally the operating voltage of an inspection instrument using PDLC is very high, over 300 V, reducing its lifetime and reliability. The operating-voltage issue becomes more serious in the inspection of touch-screen panel (TSP) electrodes, due to the bezel structure protruding over the electrodes. We have theoretically calculated the parameters affecting the operating voltage as a function of the distance between the TSP and the PDLC, the thickness, and the dielectric constant of the sublayers when the inspection module was away from the TSP electrodes. We have experimentally verified the results, and have proposed a way to reduce the operating voltage by substituting a plastic substrate film with a hard coating layer of smaller thickness and higher dielectric constant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%