Touch display device for energy harvesting

Patent metadata

Field	Value
Publication number	US-9753538-B2
Application number	US-201514811709-A
Country	US
Kind code	B2
Filing date	Jul 28, 2015
Priority date	Oct 29, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

Disclosed herein is a touch display device, including: a panel including a plurality of sensing electrodes which are arranged under a dielectric layer and in a matrix configuration; a rectification unit including at least one rectifier configured to be connected to at least two sensing electrodes; and an energy storage unit including at least one capacitive element which is connected to the rectifier.

First claim

What is claimed is:

1. A touch display device having at least a touch sensing mode and an electric charge harvesting mode, comprising:
a touch display panel including a plurality of touch sensing electrodes which are arranged under a dielectric layer and in a matrix configuration, wherein adjacent ones of the touch sensing electrodes are separated by respective insulators disposed there-between;
a rectification unit including at least one rectifier configured to be connected to at least two touch sensing electrodes of the plurality of touch sensing electrodes in the electric charge harvesting mode, so as to receive electric charge from each of the at least two sensing electrodes, whereby:
a user touch body part having an electric charge touching the dielectric layer causes a corresponding electric charge on a first of the at least two touch sensing electrodes that is underneath the touch location, to thereby cause current to flow from the first touch sensing electrode to a second of the at least two touch sensing electrodes and to feed into the at least one rectifier to create a first rectified voltage, and
the user touch body part having the electric charge moving to and touching the dielectric layer over the second touch sensing electrode causes a corresponding electric charge on the second touch sensing electrode, to thereby cause current to flow from the second touch sensing electrode to the first touch sensing electrode and to feed into the at least one rectifier to create a second rectified voltage; and

an energy storage unit including at least one capacitive element which is connected to the at least one rectifier to store the first and second rectified voltages.

2. The touch display device of claim 1 , wherein
the plurality of sensing electrodes comprises N pairs of the sensing electrodes, where N is a natural number;
the rectification unit includes N rectifiers, and
each pair of the sensing electrodes is connected to a different one of the rectifiers.

3. The touch display device of claim 1 , wherein
the rectification unit comprises single rectifier, and
the plurality of sensing electrodes is connected to or disconnected from the single rectifier according to a control signal.

4. The touch display device of claim 1 , wherein
the dielectric layer is charged with negative charge.

5. The touch display device of claim 1 , wherein
the panel is bent so as to have a curved shape so as to have a first radius of curvature, and
the panel is further configured to receive a voltage and to flatten in response to the received voltage so as to have a second radius of curvature, the second radius of curvature being larger than the first radius of curvature.

6. The touch display device of claim 1 , wherein
the touch display device is a self capacitance type display device.

7. The touch display device of claim 1 , further comprising:
a timing control unit configured to output a control signal during at least one of a plurality of driving modes, the plurality of driving modes including a first driving mode, a second driving mode, and a third driving mode;
a touch control unit configured to supply a touch driving voltage and to process a touch signal; and
a mode selection unit configured to connect the sensing electrodes to the touch control unit in the first driving mode and to selectively connect ones of the sensing electrodes to the rectification unit in the second driving mode.

8. The touch display device of claim 7 , further comprising
a haptic driving unit configured to supply a haptic voltage,
wherein the mode selection unit is further configured to connect the sensing electrodes to the haptic driving unit in the third driving mode.

9. The touch display device of claim 7 , wherein the touch display device is further configured to implement each driving mode in a time divided manner.

10. The touch display device of claim 9 , wherein
the touch display device is further configured to implement the second driving mode after the first driving mode,
at least two sensing electrodes form a circuit in the second driving mode, together with the rectifier of the rectification unit, and
the energy storage unit is configured to store a current generated in the closed circuit by a touch.

11. The touch display device of claim 10 , wherein the touch display device is further configured to repeatedly implement the first driving mode and the second driving mode during a dead time of the display.

Assignees

• Samsung Display Co Ltd

Inventors

• Hong Won-Ki
• Lee Jong Seo

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/04184

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title

• G06F3/04166

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title