11.1: A 4‐mm Radius Curved Display with Touch Screen

Abstract

We discuss the steps for obtaining a curved touch-enabled display by using a c-axis aligned crystalline oxide semiconductor, OLEDs, a flexible-display technology, and a capacitive touch screen. This result is a side-roll display in which the front and side surfaces are a single curved surface with a 4 mm radius.

Failure criterion of silver nanowire electrodes on a polymer substrate for highly flexible devices

“…Because these FDs are under various stress states including tensile, compression, and bending6789, the developers of FDs have used the threshold ROC of FDs as an electrical failure criterion1610111213. These threshold ROCs, at which the electrical resistance increases over 10%, have been reduced from 10 mm for bendable displays to less than 5–3 mm for rollable and foldable displays, respectively1131415.…”

“…A recent bending test using Ag NWs-embedded UV curable polymer electrode provides a possibility that can be enhanced up to less than 1 mm in the threshold ROC24. Despite the promising performance of Ag NWs, the research on the mechanical and electrical relationship between the bent electrode-on-substrate and Ag NWs themselves has not yet been reported, because the studies on nanomechanics26272829 and flexible devices111416 have been independently performed by researchers in each field. In this work, thus, the failure criterion of Ag NW electrode films was investigated by measuring the inherent mechanical characteristics of standalone Ag NWs and by relating them with the electrical deformation of the electrode films under tensile bending strain.…”

P‐193: Viewing Angle Performance of Curved Color‐by‐White AMOLEDs

“…The display used for this study was a white tandem OLED, topemitting, color filter (WTC) AMOLED designed and fabricated by Semiconductor Energy Laboratory. A version with a touch screen has also been presented [1,13]. The basic properties of the display are summarized in Table 1.…”

A foldable OLED display with an in-cell touch sensor having embedded metal-mesh electrodes

“…Consequently, defects such as false detection and detection failure are prone to occur. We have fabricated a side‐roll OLED display with a curved surface including a mutual capacitive touch sensor . The curved shape of this display is fixed and cannot be changed by a user; thus, maintaining the distance between the touch sensor and the display reduces parasitic capacitance and noise impact.…”

“…We have fabricated a side-roll OLED display with a curved surface including a mutual capacitive touch sensor. 8 The curved shape of this display is fixed and cannot be changed by a user; thus, maintaining the distance between the touch sensor and the display reduces parasitic capacitance and noise impact. However, the distance between the display and the sensor electrode cannot be increased because we used the in-cell touch sensor to reduce the total thickness of the touch panel.…”