Laser processing enabling radio frequency identification (RFID) customization
View Patent ↗Methods, algorithms, processes, circuits, and/or structures for laser patterning suitable for customized RFID designs are disclosed. In one embodiment, a method of laser patterning of an identification device can include the steps of: (i) depositing a patternable resist formulation on a substrate having configurable elements and/or materials thereon; (ii) irradiating the resist formulation with a laser tool sufficiently to change the solubility characteristics of the resist in a developer; and (iii) developing exposed areas of the resist using the developer. Embodiments of the present invention can advantageously provide a relatively low cost and high throughput approach for customized RFID devices.
1. A plurality of identification devices, each of the plurality of identification devices comprising:
a) a metal layer, a dielectric layer, and a semiconductor layer on a substrate, and
b) an antenna attached to the identification device formed in the substrate;
wherein:
each of the plurality of identification devices is configured to receive a first wireless signal, demodulate said first wireless signal, perform control and readout functions, modulate a second wireless signal and broadcast said second wireless signal, and:
a first one of said plurality of identification devices includes a first pattern in a material selected from the group consisting of said metal layer, said dielectric layer, and said semiconductor layer; and
next ones of said plurality of identification devices includes a different pattern in a same material as said first pattern, such that at least a majority of said plurality of identification devices contains a unique pattern in said same material in which said first pattern is formed, wherein said first pattern, said different pattern and said unique pattern encode a bit string or signal pattern.
2. The plurality of identification devices of claim 1 , wherein said unique pattern comprises a patterned metal layer.
3. The of claim 2 , wherein the patterned metal layer comprises Ag, Al, Pd, Rh, Cu, Pt, Ni, Fe, Ru, Os, Mn, Cr, Mo, Au, W, Co, Ti, Ir, Zn, and/or Cd.
4. The plurality of identification devices of claim 1 , wherein said unique pattern comprises a patterned semiconductor layer.
5. The plurality of identification devices of claim 1 , wherein said unique pattern comprises a via pattern in a dielectric layer.
6. The plurality of identification devices of claim 5 , wherein the dielectric layer comprises a photopatternable dielectric.
7. The plurality of identification devices of claim 6 , wherein the photopatternable dielectric comprises a curable dielectric material and a light-absorbing dye therein.
8. The plurality of identification devices of claim 1 , each identification device comprising a memory, clock circuitry, and logic in communication with said memory and said clock circuitry.
9. The plurality of identification devices of claim 8 , wherein said unique pattern is in said memory and/or said logic, and said memory and/or said logic are configured to provide or generate said unique identifier.
10. The plurality of identification devices of claim 9 , wherein each identification device further comprises power conversion circuitry configured to convert a signal having a characteristic frequency to an electric potential.
11. The plurality of identification devices of claim 10 , wherein the antenna is configured to receive said signal having said characteristic frequency and provide said signal having said characteristic frequency to said clock circuitry and to said power conversion circuitry.
12. The plurality of identification devices of claim 1 , wherein said encode a bit string or signal pattern unique identifier comprises a unique bit stream, and each of said plurality of identification devices further comprise a modulator configured to receive said bit stream from said logic circuitry.
13. The plurality of identification devices of claim 1 , wherein the plurality of identification devices are each one of the group consisting of an electronic article surveillance (EAS) device, a radio frequency (RF) device, a high frequency (HF) device, and an ultra high frequency (UHF) device.
14. The plurality of identification devices of claim 13 , wherein said plurality of identification devices comprise radio frequency identification devices (RFIDs).
15. The plurality of identification devices of claim 1 , wherein each of the first pattern, the different pattern, and the unique pattern is configured to provide a unique identifier.
16. The plurality of identification devices of claim 15 , wherein the unique identifier comprises a local security key, the local security key comprising a predetermined bit string that is unique to a particular identification device.
17. The plurality of identification devices of claim 1 , wherein each of the plurality of identification devices has a length of from 2 to 20 mm and a width of from 5 to 20 mm.
18. The plurality of identification devices of claim 1 , wherein each of the plurality of identification devices has an area of from 10 to 50 mm 2 .