Touch sensor, electronic paper display panel and electronic paper display apparatus

Abstract

A touch sensor configured to sense a touch object is provided. The touch sensor includes a sensing device and a sensing circuit. The sensing device includes a substrate, a sensing electrode, a sensing common electrode and a shielding layer. The sensing electrode and the sensing common electrode are disposed on the substrate. The shielding layer is disposed on the sensing electrode and the sensing common electrode. The sensing circuit is electrically connected to the sensing device. The sensing circuit includes a resistor device. A relaxation frequency of a relaxation signal of the touch sensor is determined according to a resistance of the resistor device and/or a parasitic resistance of the sensing device. A pulse difference of the relaxation signal is changed by the touch object. The touch object is a conductor. An electronic paper display panel and an electronic paper display apparatus including the foregoing touch sensor are also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 107116396, filed on May 15, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTIONField of the Invention[0002]The invention relates to a sensor, a display panel and a display apparatus, and particularly relates to a touch sensor, an electronic paper display panel and an electronic paper display apparatus.Description of Related Art[0003]In recent years, since an electronic paper display apparatus has advantages of light and slim, durable, low power consumption that meets the requirement of energy saving and environmental protection, etc., it is widely applied to electronic readers (for example, electronic books, electronic newspapers) or other electronic devices (for example, electronic tags). On the other hand, if the electronic paper display apparat...

AI Technical Summary

Benefits of technology

[0031]The invention provides an electronic paper display panel having a touch sensing function. The electronic paper display panel includes a plurality of pixel units. The pixel units are arranged in an array to sense a touch object. Each of the pixel units includes a first transistor, a pixel capacitor device, a storage capacitor device, a second transistor, a touch capacitor device and a sensing capacitor device. The first transistor has a first terminal, a second terminal and a control terminal. The first terminal of the first transistor is electrically connected to a data line. The control terminal of the first transistor is electrically connected to a first scan line. The pixel capacitor device has a first terminal and a second terminal. The first terminal of the pixel capacitor device is electrically connected to the second terminal of the first transistor. The second terminal of the pixel capacitor device is electrically connected to a first common electrode line. The storage capacitor device has a first terminal and a second terminal. The first terminal of the storage capacitor device is electrically connected to the second terminal of the first transistor. The second terminal of the storage capacitor device is electrically connected to the first common electrode line. The second transistor has a first terminal, a second terminal and a control terminal. The first terminal of the second transistor is electrically connected to the data line. The control terminal of the second transistor is electrically connected to a second scan line. The touch capacitor device has a first terminal and a second terminal. The first terminal of the touch capacitor device is electrically conne

Problems solved by technology

Generally, a touch sensor has to be exposed to air, and an internal layered structure thereof should not include, for example, an Indium Tin Oxide (ITO) conductive thin film or other similar conductive layer, so as to avoid covering other layered structures to cause a shi

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