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Method of Double Sided Touch Control on Touch Devices

IP.com Disclosure Number: IPCOM000248701D
Publication Date: 2016-Dec-28
Document File: 4 page(s) / 65K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure provides a double sided touch control method to distinguish whether the finger touch or approach is from the back or front of the device. Wherein, two overlapping capacitive sensors in touch screen are used to detect the touch or approach of fingers. And orientation of the finger touch/approach (from the back or front of the device) would be determined according to the difference of distance values between the finger and the two capacitive sensors respectively.

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Method of Double Sided Touch Control on Touch Devices

Now mobile devices with touch screen are becoming prevalent enough for personal and business uses. To add a greater variety of touch/gesture operations, there are some solutions to provide back touch experience on mobile devices or other touch devices. In that case, the user can operate the mobile phone with touch or gesture operations at not only the front of mobile but also the back of mobile. But as described in the next prior art section, these existing solutions all require an additional touch panel or touch screen which is arranged on the back face of the mobile terminal.

However with these solutions, two independent touch panels on the front and back of the mobile would cause some problems and disadvantages. Obviously, the thickness of mobile would be increased. The power consumption is likely to be risen. And it would increase the risk of damage due to screens or panels on two sides of mobile. Additionally, it changes the appearance of current mobile design and affect the continuous user experience on mobiles.

Accordingly, it is desirable to provide a new method to distinguish whether the finger touch or approach is from the back or front of the device, and which would not obviously affect the thickness of mobile, power consumption and the current appearance, at the same time it can't be damaged easily.

The main objective of this disclosure is to determine whether the finger touch is from the back or front of the device. The possible logic and control flow associated with this disclosure are documented below.

1. Combine two capacitive sensors in a touch screen.

This disclosure would utilize a touch sensor technology on the capacitive sensor, floating touch (introduced in the prior art, US20150084921), which can make the touch screen to detect the finger's distance from the screen.

Two capacitive sensors are overlapped in a touch screen. As illustrated in Fig.1 below, there are double layers of capacitive sensors in a touch screen, the upper layer 101 and the lower layer 102, which are part of the touch screen, and are above the main body 103 of the device. The two overlapping layers might be the same or different kind of sensors. And as needed, other function layers and sensors can be added between the upper layer and the lower layer to increase the distance between the two layers.

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2. Determine whether the finger touch is from the back or front of the device.

As illustrated in Fig.2, the touch screen, including the two capacitive sensor layers, can detect the touch or approach of a finger, and then determine,

If the distance between the detected finger and the upper layer 201 is less than the distance between the finger and the lower layer 202.

The system would tell the touch or approach of the finger is from the front of the device 203.

(It can also be interpreted that the density of sensing point on the upper layer 201 is greater than the density on the lower layer 202.)

If...