Mechanical integrity of touch‐screen components

Sierros, Konstantinos A.; Kukureka, Stephen N.

doi:10.1889/jsid17.11.947

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…Transparent conducting oxide (TCO) electrodes are essential components in ubiquitous thin film devices, including solar cells, , LEDs, touch screens, displays, − and transparent thin film transistors (TTFTs) . Conventional fabrication approaches for patterning TCOs typically require vacuum technologies and subtractive processing, which result in low material utilization and limit the viable material set to TCOs with suitable etch selectivity.…”

Section: Introductionmentioning

confidence: 99%

Gravure-Printed Sol–Gels on Flexible Glass: A Scalable Route to Additively Patterned Transparent Conductors

Scheideler

Jang

Karim

et al. 2015

ACS Appl. Mater. Interfaces

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Gravure printing is an attractive technique for patterning high-resolution features (<5 μm) at high speeds (>1 m/s), but its electronic applications have largely been limited to depositing nanoparticle inks and polymer solutions on plastic. Here, we extend the scope of gravure to a new class of materials and on to new substrates by developing viscous sol-gel precursors for printing fine lines and films of leading transparent conducting oxides (TCOs) on flexible glass. We explore two strategies for controlling sol-gel rheology: tuning the precursor concentration and tuning the content of viscous stabilizing agents. The sol-gel chemistries studied yield printable inks with viscosities of 20-160 cP. The morphology of printed lines of antimony-doped tin oxide (ATO) and tin-doped indium oxide (ITO) is studied as a function of ink formulation for lines as narrow as 35 μm, showing that concentrated inks form thicker lines with smoother edge morphologies. The electrical and optical properties of printed TCOs are characterized as a function of ink formulation and printed film thickness. XRD studies were also performed to understand the dependence of electrical performance on ink composition. Printed ITO lines and films achieve sheet resistance (Rs) as low as 200 and 100 Ω/□, respectively (ρ≈2×10(-3) Ω-cm) for single layers. Similarly, ATO lines and films have Rs as low as 700 and 400 Ω/□ with ρ≈7×10(-3) Ω-cm. High visible range transparency is observed for ITO (86-88%) and ATO (86-89%). Finally, the influence of moderate bending stress on ATO films is investigated, showing the potential for this work to scale to roll-to-roll (R2R) systems.

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Section: Introductionmentioning

confidence: 99%

Gravure-Printed Sol–Gels on Flexible Glass: A Scalable Route to Additively Patterned Transparent Conductors

Scheideler

Jang

Karim

et al. 2015

ACS Appl. Mater. Interfaces

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“…Some touch screens also use touch pens as input devices [4]. Resistive and capacitive [5] touch screens have been used most widely in portable equipment. Meanwhile, surface acoustic wave and infrared touch screens have mostly been used in large outdoor touch-control devices [6] like ATMs.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a piezoelectric material based touch screen with additional pressure and its acceleration measurement functions

Chu¹,

Liu²,

Gao³

et al. 2013

Smart Mater. Struct.

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Touch screens are becoming more and more prevalent in everyday environments due to their convenience and humanized operation. In this paper, a piezoelectric material based touch screen is developed and investigated. Piezoelectric ceramics arrayed under the touch panel at the edges or corners are used as tactile sensors to measure the touch positioning point similarly to conventional touch screens. However, additional touch pressure and its acceleration performance can also be obtained to obtain a higher-level human–machine interface. The piezoelectric ceramics can also be added to a traditional touch screen structure, or they can be used independently to construct a novel touch screen with a high light transmittance approach to a transparent glass. The piezoelectric ceramics were processed from PZT piezoelectric ceramic powder into a round or rectangular shape. According to the varied touch position and physical press strength of a finger, or even a gloved hand or fingernail, the piezoelectric tactile sensors will have different output voltage responses. By calculating the ratio of different piezoelectric tactile sensors’ responses and summing up all piezoelectric tactile sensors’ output voltages, the touch point position, touch pressure and touch force acceleration can be detected. A prototype of such a touch screen is manufactured and its position accuracy, touch pressure and response speed are measured in detail. The experimental results show that the prototype has many advantages such as high light transmittance, low energy cost and high durability.

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“…The most commonly used flexible transparent electrode today is indium tin oxide (ITO) deposited on PET. ITO is a brittle transparent conducting oxide (TCO) and cracks at relative low externally applied tensile strains (around 2%) [1][2][3]. Currently, the durability of flexible transparent electrode materials is the limiting factor in developing these devices.…”

Section: Introductionmentioning

confidence: 99%

P‐184: Highly Durable Transparent Carbon Nanotube Films for Flexible Displays and Touch ‐ Screens

Sierros

Cairns

Hecht³

et al. 2010

Symp Digest of Tech Papers

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This paper describes a durable carbon nanotube (CNT) film, used in flexible displays and touch-screens, and its mechanical properties. CNT films as thin as 10 nm thick have properties approaching those of existing electrodes based on indium tin oxide (ITO) but with significantly improved mechanical properties. These durable CNT-based electrodes hold the key to developing robust, large-area, lightweight, optoelectronic devices such as lighting, displays, electronic-paper, and printable solar cells. Such devices could hold the key to producing inexpensive green energy, providing reliable solid-state lighting, and significantly reducing our dependence on paper.

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Mechanical integrity of touch‐screen components

Cited by 7 publications

References 18 publications

Gravure-Printed Sol–Gels on Flexible Glass: A Scalable Route to Additively Patterned Transparent Conductors

Gravure-Printed Sol–Gels on Flexible Glass: A Scalable Route to Additively Patterned Transparent Conductors

Design and analysis of a piezoelectric material based touch screen with additional pressure and its acceleration measurement functions

P‐184: Highly Durable Transparent Carbon Nanotube Films for Flexible Displays and Touch ‐ Screens

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