Point of sale device and method for operating same
A point of sale device including an LCD display, a contactless payment antenna arranged in propinquity to the LCD display, LCD control circuitry and contactless communication circuitry associated with the contactless payment antenna, the LCD control circuitry and the contactless communication circuitry operating at least partially in time coordination with each other in order to prevent interference therebetween.
1. A point of sale device comprising:
an LCD display;
a contactless payment antenna arranged in propinquity to said LCD display;
contactless communication circuitry associated with said contactless payment antenna;
LCD control circuitry, wherein said LCD control circuitry has at least first and second refresh rates and is operative at a first, lower refresh rate during operation of said contactless communication circuitry in carrying out a transaction and at a second, higher refresh rate at times when said contactless communication circuitry is not carrying out the transaction; and
coordination control circuitry, operative to control operation of said LCD control circuitry thereby to reduce interference to operation of said contactless communication circuitry resulting from operation of said LCD display.
2. The point of sale device according to claim 1 and wherein said contactless communication circuitry is operative at least during at least one of a vertical blanking interval (VBI), a VSYNC signal duration, and a HSYNC signal duration in the operation of said LCD control circuitry.
3. The point of sale device according to claim 1 and wherein said contactless payment antenna is disposed behind said LCD display.
4. The point of sale device according to claim 1 and wherein said contactless payment antenna is disposed surrounding said LCD display.
5. The point of sale device according to claim 1 and wherein said coordination control circuitry is operative to cause said LCD control circuitry and said contactless communication circuitry to operate in time coordination with each other in order to reduce interference therebetween.
6. The point of sale device according to claim 1 and wherein:
said LCD control circuitry provides a clock signal and a data enable signal; and
said coordination control circuitry is operative to vary at least one of said clock signal and said data enable signal in order to reduce interference between said LCD display and operation of said contactless communication circuitry.
7. The point of sale device according to claim 6 and wherein said coordination control circuitry is operative to disable said data enable signal during at least some of transmit/receive time duration of said contactless communication circuitry.
8. The point of sale device according to claim 6 and wherein said coordination control circuitry is operative to disable said data enable signal during at least one of a polling operation and a payment data transfer operation of said contactless communication circuitry.
9. The point of sale device according to claim 6 and wherein said coordination control circuitry is operative to at least one of slow said clock signal and stop said clock signal during at least some of transmit/receive time duration of said contactless communication circuitry.
10. The point of sale device according to claim 6 and wherein said coordination control circuitry is operative to at least one of slow said clock signal and stop said clock signal during at least one of a polling operation and a payment data transfer operation of said contactless communication circuitry.
11. The point of sale device according to claim 6 and wherein said coordination control circuitry is operative to at least one of slow said clock signal and stop said clock signal to an extent responsive to an amount of data to be transferred during payment data transfer operation of said contactless communication circuitry.
12. The point of sale device according to claim 2 and wherein said coordination control circuitry is operative to at least partially synchronize payment data transfer operation of said contactless communication circuitry with the HSYNC signal of said LCD display.
13. A point of sale device comprising:
an LCD display;
a contactless payment antenna arranged in propinquity to said LCD display;
contactless communication circuitry associated with said contactless payment antenna;
LCD control circuitry, said LCD control circuitry has at least first and second duty cycles for writing of data to said LCD display and is operative at a first, lower duty cycle during operation of said contactless communication circuitry in carrying out a transaction and at a second, higher duty cycle at times when said contactless communication circuitry is not carrying out the transaction; and
coordination control circuitry, operative to control operation of said LCD control circuitry thereby to reduce interference to operation of said contactless communication circuitry resulting from operation of said LCD display.
14. A method of operating an LCD display in propinquity to a contactless antenna, the method comprising:
providing LCD control circuitry and contactless communication circuitry associated with said contactless antenna; and
controlling operation of said LCD control circuitry thereby to reduce interference to operation of said contactless communication circuitry resulting from operation of said LCD display by operating said LCD control circuitry at a first, lower refresh rate during operation of said contactless communication circuitry in carrying out a transaction and at a second, higher refresh rate at times when said contactless communication circuitry is not carrying out the transaction.
15. The method of claim 14 , further comprising operating said contactless communication circuitry at least during at least one of a vertical blanking interval (VBI), a VSYNC signal duration, and a HSYNC signal duration in the operation of said LCD control circuitry.
16. The method of claim 14 , wherein said LCD control circuitry provides a clock signal and a data enable signal, and further comprising varying at least one of said clock signal and said data enable signal in order to reduce interference between said LCD display and operation of said contactless communication circuitry.
17. The method of claim 14 , wherein said LCD control circuitry provides a data enable signal, and further comprising disabling said data enable signal during at least some of transmit/receive time duration of said contactless communication circuitry.
18. The method of claim 14 , wherein said LCD control circuitry provides a data enable signal, and further comprising disabling said data enable signal during at least one of a polling operation and a payment data transfer operation of said contactless communication circuitry.
19. The method of claim 14 , wherein said LCD control circuitry provides a clock signal and further comprising slowing or stopping said clock signal during at least some of transmit/receive time duration of said contactless communication circuitry.
20. The method of claim 14 , wherein said LCD control circuitry provides a clock signal and further comprising slowing or stopping said clock signal during at least one of a polling operation and a payment data transfer operation of said contactless communication circuitry.