Security document circuit
First Claim
Patent Images
1. A security document, circuity comprising:
- an antenna arranged to receive EM-radiation from an external source and to convert it into electric energy;
a rectifier arranged to receive electric energy from said antenna and convert said energy to a rectified current; and
an electrochromic display arranged to receive rectified current from said rectifier, and to alter its electrochromic state in response to said rectified current in order to indicate the authenticity of a security document,wherein the electrochromic display comprises;
a first pixel and a second pixel, each having an electrochromic layer and a counter layer electronically separated from each other, and a solidified electrolyte, which ionically connects said electrochromic layer and said counter layer of said first and second pixel, respectively,wherein the counter layer of said first pixel and said second pixel are electronically connected to a first gate electrode and a second gate electrode, respectively;
the electrochromic layer of said first pixel electronically connects a first source electrode to a first drain electrode,the electrochromic layer of said second pixel electronically connects a second source electrode to a second drain electrode;
each pixel comprises a switch portion of electrochemically active material arranged electronically between said source electrode and said drain electrode, which switch portion is in direct ionic contact with said solidified electrolyte;
anda resistor being arranged between and electrically connected to a first contact portion and a second contact portion;
said first drain electrode being connected to said second gate electrode; and
both said first drain electrode and second gate electrode being connected to said first contact portion of said resistor, wherein said source and gate electrodes of said first pixel are arranged to receive and maintain a first potential difference; and
said source electrode of said second pixel and said second contact portion of said resistor are arranged to receive and maintain a second potential difference;
such that the voltage difference across the electrolyte of said second pixel is controllable by an increase in resistance between said source and drain electrodes of said first pixel.
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Accused Products
Abstract
The authenticity of a security document, such as a bank note, is verified by use of a security feature arranged in or on the document, which security feature comprises an antenna arranged to receive EM-radiation from an external energy source; a rectifier arranged to receive electric energy from the antenna and convert it into a rectified current; and an electrochromic display arranged to alter its electrochromic state in response to said rectified current. Hence, a security feature able alter its appearance in response to EM-radiation is provided, which comprises a display that can be given a large variety of two dimensional shapes.
19 Citations
24 Claims
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1. A security document, circuity comprising:
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an antenna arranged to receive EM-radiation from an external source and to convert it into electric energy; a rectifier arranged to receive electric energy from said antenna and convert said energy to a rectified current; and an electrochromic display arranged to receive rectified current from said rectifier, and to alter its electrochromic state in response to said rectified current in order to indicate the authenticity of a security document, wherein the electrochromic display comprises; a first pixel and a second pixel, each having an electrochromic layer and a counter layer electronically separated from each other, and a solidified electrolyte, which ionically connects said electrochromic layer and said counter layer of said first and second pixel, respectively, wherein the counter layer of said first pixel and said second pixel are electronically connected to a first gate electrode and a second gate electrode, respectively; the electrochromic layer of said first pixel electronically connects a first source electrode to a first drain electrode, the electrochromic layer of said second pixel electronically connects a second source electrode to a second drain electrode; each pixel comprises a switch portion of electrochemically active material arranged electronically between said source electrode and said drain electrode, which switch portion is in direct ionic contact with said solidified electrolyte; and a resistor being arranged between and electrically connected to a first contact portion and a second contact portion; said first drain electrode being connected to said second gate electrode; and
both said first drain electrode and second gate electrode being connected to said first contact portion of said resistor, wherein said source and gate electrodes of said first pixel are arranged to receive and maintain a first potential difference; andsaid source electrode of said second pixel and said second contact portion of said resistor are arranged to receive and maintain a second potential difference;
such that the voltage difference across the electrolyte of said second pixel is controllable by an increase in resistance between said source and drain electrodes of said first pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A security document circuitry comprising:
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an antenna arranged to receive EM-radiation from an external source and to convert it into electric energy; a rectifier arranged to receive electric energy from said antenna and convert said energy to a rectified current; and an electrochromic display arranged to receive rectified current from said rectifier, and to alter its electrochromic state in response to said rectified current in order to indicate the authenticity of a security document, wherein the electrochromic display comprises; a first portion of electrochromic and electrochemically active material; a second portion of electrochromic and electrochemically active material; which first and second portions are electronically separated from each other; a counter portion of electrochromic and electrochemically active material, which counter portion is electronically separated from both said first and second portions; and a layer of electrolyte which ionically connects said counter portion with both said first and second portions; wherein said first portion is arranged spatially between said counter portion and said second portion on more than one side of said second portion.
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Specification