1. A common voltage generating circuit of a Liquid Crystal Display (LCD), comprising:
a first flip-flop, having a first input end, a second input end, a negative clock input end for receiving a data-loading signal of the LCD, and an output end for outputting a first step signal;
a capacitor, having a first end electrically connected to the output end of the first flip-flop, and a second end;
a resistor, having a first end electrically connected to the second end of the capacitor for outputting a waveform voltage, and a second end electrically connected to a ground end; and
a regulation circuit, electrically connected to the first end of the resistor, for inverting the waveform voltage and adjusting DC level and magnitude of the waveform voltage according to a reference voltage.
2. The common voltage generating circuit of the LCD of claim 1, wherein the regulation circuit comprises:
an operational amplifier, having a negative input end, a positive input end for receiving the reference voltage, and an output end;
a first resistor, having a first end electrically connected to the negative input end of the operational amplifier, and a second end electrically connected to the output end of the operational amplifier; and
a second resistor, having a first end electrically connected to the first end of the resistor, and a second end electrically connected to the negative input end of the operational amplifier.
3. The common voltage generating circuit of the LCD of claim 2, further comprising a reference-voltage generating circuit for generating the reference voltage, the reference-voltage generating circuit comprising:
a variable resistor, having a first end electrically connected to a voltage source, a second end, and a third end electrically connected to the positive input end of the operational amplifier;
a resistor, having a first end electrically connected to the second end of the variable resistor, and a second end electrically connected to the ground end; and
a capacitor, having a first end electrically connected to the first end of the resistor, and a second end electrically connected to the second end of the resistor.
4. The common voltage generating circuit of the LCD of claim 1, wherein the first input end of the first flip-flop and the second input end of the first flip-flop receive a high-level voltage, respectively.
5. The common voltage generating circuit of the LCD of claim 1, further comprising:
a second flip-flop, having a first input end, a second input end, a positive clock input end for receiving the first step signal, and an output end for outputting a second step signal.
6. The common voltage generating circuit of the LCD of claim 5, wherein the first input end of the second flip-flop and the second input end of the second flip-flop receives a high-level voltage, respectively.
7. The common voltage generating circuit of the LCD of claim 5, further comprising:
a first switch, electrically connected between the output end of the first flip-flop and the first end of the capacitor; and
a second switch, electrically connected between the output end of the second flip-flop and the first end of the capacitor.
8. The common voltage generating circuit of the LCD of claim 7, wherein the first switch and the second switch are controlled according to a polarity control signal of the LCD.
9. The common voltage generating circuit of the LCD of claim 8, wherein when the polarity control signal is one-line inversion, the first switch is turned on and the second switch is turned off so as to transmit the first step signal to the first end of the capacitor.
10. The common voltage generating circuit of the LCD of claim 8, wherein when the polarity control signal is two-line inversion, the first switch is turned off and the second switch is turned on so as to transmit the second step signal to the first end of the capacitor.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method comprising:
requesting content over a communication link;
receiving the requested content;
sending a first acknowledgment acknowledging receipt of the content;
receiving a second acknowledgement; and
enabling utilization of the received content in response to receiving the second acknowledgement.
2. The method of claim 1, further comprising disabling utilization of the requested content until the second acknowledgment is received.
3. The method of claim 1, wherein the communication link is a wireless link.
4. The method of claim 1, wherein the content comprises at least one of textual, graphical and video information, and said utilization comprises displaying said content.
5. The method of claim 1, wherein the content comprises audio information, and said utilization comprises outputting an audio signal representative of said audio information.
6. The method of claim 1, wherein the content comprises at least one of a script or a program, and said utilization comprises running said script or program.
7. The method of claim 1, wherein said receiving the content comprises storing the received content and suppressing utilization of said content until the second acknowledgement is received.
8. The method of claim 1, further comprising resending the first acknowledgement in response to not receiving the second acknowledgment within a timeout period.
9. The method of claim 1, wherein said receiving content comprises receiving instructions operative to disable utilization of the received content until the second acknowledgment is received.
10. The method of claim 1, wherein said content is encrypted, and wherein said receiving said second acknowledgment comprises receiving a decryption key.
11. A method comprising:
receiving a request for content from a requesting device;
sending the requested content to the requesting device; and
transmitting a utilization acknowledgment to the requesting device in response to receiving a delivery confirmation acknowledgment from the requesting device, said utilization acknowledgment being operative to enable the requesting device to utilize the content.
12. The method of claim 11, wherein said transmitting the utilization acknowledgement comprises transmitting a display acknowledgment operative to enable the requesting device to display the content.
13. The method of claim 11, further comprising authorizing billing for the requested content in response to receiving the delivery confirmation acknowledgment from the requesting device.
14. The method of claim 11, wherein said receiving the request comprises receiving the request over a first communication link.
15. The method of claim 14, further comprising forwarding the request over a second communication link, wherein said second communication link is more reliable than said first communication link.
16. The method of claim 15, wherein the first communication link comprises a wireless link.
17. The method of claim 15, wherein the second communication link comprises a wired link.
18. The method of claim 11, further comprising retransmitting the requested content in response-to not receiving a delivery confirmation acknowledgment from the requesting device within a timeout period.
19. The method of claim 11, further comprising determining a history of delivery confirmation acknowledgment by said requesting device and wherein said sending the requested content to said requesting device is only performed if said history does not indicate a discrepancy.
20. A system comprising:
a content provider connected to a first network and operative to transmit content requested by a user station connected to a second network;
a gateway device connected to the first network and the second network, said gateway device operative to forward the requested content to the user station and to transmit a utilization acknowledgment operative to enable the user station to utilize the requested content in response to receiving a delivery confirmation acknowledgment from the user station; and
a billing system operative to bill a user for the delivered content in response to the display acknowledgment being transmitted.
21. The system of claim 20, wherein the content provider is operative to generate the display acknowledgment in response to receiving the delivery confirmation acknowledgement via the gateway device.
22. The system of claim 20, wherein the gateway device is operative to generate the display acknowledgment in response to receiving the delivery confirmation acknowledgement from the user station.
23. The system of claim 20, wherein the first network is more reliable than the second network.
24. The system of claim 23, wherein the first network is a wired network.
25. The system of claim 23, wherein the second network is a wireless network.
26. The system of claim 25, wherein the user station comprises a mobile device.
27. The system of claim 20, wherein said content provider further determines a history of delivery confirmation acknowledgment by said user station and wherein said sending of said content requested by said user station is only performed if said history does not indicate a discrepancy.
28. An article comprising a machine-readable medium including machine-executable instructions, the instructions operative to cause a machine to:
request content over a communication link;
receive the requested content;
send a first acknowledgment acknowledging receipt of the content;
receive a second acknowledgement; and
enable utilization of the received content in response to receiving the second acknowledgement.
29. The article of claim 28, further comprising instructions operative to cause the machine to disable utilization of the received content until the second acknowledgment is received.
30. An article comprising a machine-readable medium including machine-executable instructions, the instructions operative to cause a machine to:
receive a request for content from a requesting device;
send the requested content to the requesting device; and
transmit a utilization acknowledgment to the requesting device in response to receiving a delivery confirmation acknowledgment from the requesting device, said utilization acknowledgment being operative to enable the requesting device to utilize the content.
31. The article of claim 30, further comprising instructions operative to cause the machine to authorize billing for the requested content in response to receiving the delivery confirmation acknowledgment from the requesting device.