Printing sensors and electronics over flexible substrates are an area of significant interest due to low-cost fabrication and possibility of obtaining multifunctional electronics over large areas. Over the years, a number of printing technologies have been developed to pattern a wide range of electronic materials on diverse substrates. As further expansion of printed technologies is expected in future for sensors and electronics, it is opportune to review the common features, the complementarities, and the challenges associated with various printing technologies. This paper presents a comprehensive review of various printing technologies, commonly used substrates and electronic materials. Various solution/dry printing and contact/noncontact printing technologies have been assessed on the basis of technological, materials, and process-related developments in the field. Critical challenges in various printing techniques and potential research directions have been highlighted. Possibilities of merging various printing methodologies have been explored to extend the lab developed standalone systems to high-speed roll-to-roll production lines for system level integration.

https://cris.fbk.eu/bitstream/11582/300858/1/Technologies%20for%20Printing%20Sensors%20and%20Electronics%20Over%20Large%20Flexible%20Substrates-A%20Review.pdf

Technologies for Printing Sensors and Electronics Over Large Flexible Substrates: A Review

Disclosed is a touch screen panel including a plurality of separate sensing electrodes, and a plurality of separate driving electrodes. Each of the sensing electrodes includes a main electrode and a plurality of expanded parts. Each of the expanded parts includes a sub-electrode extending from the main electrode and at least one expanded electrode extending from the sub-electrode. Each of the driving electrodes surrounds at least part of a corresponding one of the expanded parts.

Touch screen panel

Disclosed are a liquid crystal display device which reduces the number of masks and improves an aperture ratio, and a method for fabricating the same. The liquid crystal display device includes gate and data lines perpendicularly intersecting on a substrate having pixel and pad parts; a thin film transistor on the substrate at the intersection of the gate and data lines; a pixel electrode on the substrate at the pixel part and connected directly to a drain electrode of the thin film transistor; an insulating film on the overall surface of the substrate including the pixel electrode and the thin film transistor; an organic film on the insulating film over the thin film transistor and the data line; and a common electrode of slit shapes overlapping the pixel electrode such that the insulating film is interposed between the common electrode and the pixel electrode.

Liquid crystal display device and method for fabricating the same

Recent progress in organic field-effect transistor (OFET) printing processes is reviewed, and a perspective on the future of the field is discussed. The principles underlying the OFET printing techniques are introduced according to two categories: direct write printing and transfer printing. A comprehensive overview of the use of printing techniques in OFET production processes is also provided. Considerations for improving OFET device performance using printing processes are explored. Prior to OFET commercialization, the OFET printing techniques must satisfy several requirements, as discussed here.

Recent Advances in Organic Transistor Printing Processes

In this report, the development of conventional, mass-printing strategies into high-resolution, alternative patterning techniques is reviewed with the focus on large-area patterning of flexible thin-film transistors (TFTs) for display applications. In the first part, conventional and digital printing techniques are introduced and categorized as far as their development is relevant for this application area. The limitations of conventional printing guides the reader to the second part of the progress report: alternative-lithographic patterning on low-cost flexible foils for the fabrication of flexible TFTs. Soft and nanoimprint lithography-based patterning techniques and their limitations are surveyed with respect to patterning on low-cost flexible foils. These show a shift from fabricating simple microlense structures to more complicated, high-resolution electronic devices. The development of alternative, low-temperature processable materials and the introduction of high-resolution patterning strategies will lead to the low-cost, self-aligned fabrication of flexible displays and solar cells from cheaper but better performing organic materials.

Fabrication of Transistors on Flexible Substrates: from Mass‐Printing to High‐Resolution Alternative Lithography Strategies

A modified offset roll printing for thin film transistor applications

A manufacturing method of an electro line for a liquid crystal display device includes depositing a barrier layer made of a conducting material on a substrate, depositing a copper layer (Cu) on the barrier layer, wet-etching the Cu layer using a first etchant, and dry-etching the barrier layer using a second etchant using the wet-etched Cu layer as an etch mask.

Manufacturing method of electro line for liquid crystal display device

A touch screen panel and a method of manufacturing the same are disclosed The touch screen panel includes a substrate, an electrode forming part positioned on the substrate, and a routing wiring part positioned on the substrate outside the electrode forming part The electrode forming part includes a plurality of first electrode serials arranged parallel to one another in a first direction and a plurality of second electrode serials arranged to cross the first electrode serials The routing wiring part includes a plurality of first routing wires respectively connected to the first electrode serials and a plurality of second routing wires respectively connected to the second electrode serials A plurality of first connection patterns are formed on the same level layer as the first and second routing wires to be separated from one another

Electrostatic capacity type touch screen panel and method of manufacturing the same

A method of manufacturing an array substrate for a liquid crystal display device which includes forming a gate electrode, a gate line, and a gate pad on a substrate by sequentially depositing a metal layer and a transparent conductive layer and patterning, forming a gate insulating layer on the gate electrode, the gate line, and the gate pad, forming an active layer on the gate insulating layer over the gate electrode, forming an ohmic contact layer on the active layer, forming source and drain electrodes, a data line and a data pad on the ohmic contact layer, forming a pixel electrode, forming a data pad terminal covering the data pad, forming a passivation layer on the pixel electrode and the data pad terminal, exposing the gate pad by etching the passivation layer and the gate insulating layer, and exposing the data pad terminal by etching the passivation layer

Method of manufacturing array substrate for liquid crystal display device

A method for fabricating an LCD includes: providing a substrate with a thin film transistor (ITT) part defined thereon; forming a metallic film for a gate electrode on the substrate; etching the metallic film through a first printing process to form a gate electrode; sequentially forming a gate insulating layer, a semiconductor layer, and a metallic film for source and drain electrodes on the substrate; selectively etching the metallic film for source and drain electrodes, the semiconductor layer and the gate insulating layer through a second printing process to form a gate insulating layer pattern, a preliminary active pattern and a metallic film pattern which are sequentially stacked such that the gate insulating layer pattern is over-etched from the side of the preliminary active pattern; forming an insulating layer on the substrate with the metallic film pattern; etching the insulating layer to expose the metallic film pattern; forming a transparent conductive film on the metallic film pattern and a remaining insulating film; and selectively etching the transparent conductive film, the metallic film pattern, the preliminary active pattern to form an active pattern, a source electrode, a drain electrode, and a pixel electrode connected with the drain electrode

Seung-hee Nam

Papers

A modified offset roll printing for thin film transistor applications

Manufacturing method of electro line for liquid crystal display device

Electrostatic capacity type touch screen panel and method of manufacturing the same

Method of manufacturing array substrate for liquid crystal display device

Liquid crystal display and fabrication method thereof