Systems for providing dual resolution control of display panels

1. A system for providing dual resolution control of a display panel, said system comprising:

a dual resolution control circuit comprising:

first, second, third and fourth shift registers, each of the shift registers outputting a shifting signal;

first, second, third and fourth logic gates; and

a switching network, coupled among the shifting registers and the logic gates;

wherein, in a low resolution mode, the switching network directs the shifting signals to the shift registers such that each of the first and the third shift registers outputs a first shifting signal and each of the second and the fourth shift registers outputs a second shifting signal, the switching network also directs the shifting signals to the logic gates such that each of the first and the second logic gates outputs a first panel control signal and each of the third and the fourth logic gates outputs a second panel control signal, and wherein pulses of the first and the second panel control signals do not overlap,

wherein the phase of the shift signals of the first and the third shift registers are in-phase, the phase of the shift signals of the second and the fourth shift registers are in-phase, and

wherein the first, the second, the third and the fourth shift registers are not cascaded successively.

2. The system according to claim 1 , wherein durations of the pulses of each of the shifting signals are at least twice as long as the durations of the pulses of each of the panel control signals.

3. The system according to claim 1 , wherein, in the low resolution mode, the switching network directs the first shifting signal to each of the four logic gates, and directs the second shifting signal to the third logic gate, the fourth logic gate, a first logic gate of a next module, and a second logic gate of the next module.

4. The system according to claim 1 , wherein, in the low resolution mode, the switching network directs the first shifting signal to a first logic gate, a second logic gate, a third logic gate of the previous module, and the fourth logic gate of the previous module, and directs the second shifting signal to each of the four logic gates.

5. The system according to claim 1 , wherein each of the shift registers receives a first clock signal and a second clock signal, and receives a shifting signal from another shift register as its start pulse input; and each of the output terminals of the shift registers is connected through the switching network to at least one of the logic gates.

6. The system according to claim 5 , wherein the first clock signal and the second clock signal have the same frequency and are in opposite phases.

7. The system according to claim 5 , wherein the first shift register and the third shift register receive the first clock signal as their first inputs and the second clock signal as their second inputs, and the second shift register and the fourth shift register receive the first clock signal as their second inputs and the second clock signal as their first inputs.

8. The system according to claim 1 , wherein each of the logic gates comprises one of the following: an AND gate, an NAND gate, an AND gate and an inverter connected in series, and an NAND gate and an inverter connected in series.

9. A system for providing dual resolution control of a display panel, said system comprising:

a dual resolution control circuit comprising:

first, second, third and fourth shift registers, each of the shift registers outputting a shifting signal;

first, second, third and fourth logic gates; and

a switching network, coupled among the shifting registers and the logic gates;

wherein, in a low resolution mode, the switching network directs the shifting signals to the shift registers such that each of the first and the third shift registers outputs a first shifting signal and each of the second and the fourth shift registers outputs a second shifting signal, the switching network also directs the shifting signals to the logic gates such that each of the first and the second logic gates outputs a first panel control signal and each of the third and the fourth logic gates outputs a second panel control signal, and wherein pulses of the first and the second panel control signals do not overlap;

wherein each of the shift registers receives a first clock signal and a second clock signal, and receives a shifting signal from another shift register as its start pulse input; and each of the output terminals of the shift registers is connected through the switching network to at least one of the logic gates; and

wherein, during upward scan in the low resolution mode, the first shift register and the third shift register receive the shifting signal outputted by the second shift register or the fourth shift register as their start pulse inputs, and the second shift register and the fourth shift register receive the shifting signal outputted by the first shift register of the next module or the third shift register of the next module as their start pulse inputs, and

wherein the first, the second, the third and the fourth shift registers are not cascaded successively.

10. The system according to claim 9 , wherein durations of the pulses of each of the shifting signals are at least twice as long as the durations of the pulses of each of the panel control signals.

11. The system according to claim 9 , wherein, in the low resolution mode, the switching network directs the first shifting signal to each of the four logic gates, and directs the second shifting signal to the third logic gate, the fourth logic gate, a first logic gate of a next module, and a second logic gate of the next module.

12. The system according to claim 9 , wherein, in the low resolution mode, the switching network directs the first shifting signal to a first logic gate, a second logic gate, a third logic gate of the previous module, and the fourth logic gate of the previous module, and directs the second shifting signal to each of the four logic gates.

13. A system for providing dual resolution control of a display panel, said system comprising:

a dual resolution control circuit comprising:

first, second, third and fourth shift registers, each of the shift registers outputting a shifting signal;

first, second, third and fourth logic gates; and

a switching network, coupled among the shifting registers and the logic gates;

wherein, in a low resolution mode, the switching network directs the shifting signals to the shift registers such that each of the first and the third shift registers outputs a first shifting signal and each of the second and the fourth shift registers outputs a second shifting signal, the switching network also directs the shifting signals to the logic gates such that each of the first and the second logic gates outputs a first panel control signal and each of the third and the fourth logic gates outputs a second panel control signal, and wherein pulses of the first and the second panel control signals do not overlap;

wherein each of the shift registers receives a first clock signal and a second clock signal, and receives a shifting signal from another shift register as its start pulse input; and each of the output terminals of the shift registers is connected through the switching network to at least one of the logic gates; and

wherein, during downward scan in the low resolution mode, the first shift register and the third shift register receive the shifting signal outputted by the second shift register of the previous module or the fourth shift register of the previous module as their start pulse inputs, and the second shift register and the fourth shift register receive the shifting signal outputted by the first shift register or the third shift register as their start pulse inputs, and

wherein the first, the second, the third and the fourth shift registers are not cascaded successively.

14. The system according to claim 13 , wherein the first clock signal and the second clock signal have the same frequency and are in opposite phases.

15. The system according to claim 13 , wherein the first shift register and the third shift register receive the first clock signal as their first inputs and the second clock signal as their second inputs, and the second shift register and the fourth shift register receive the first clock signal as their second inputs and the second clock signal as their first inputs.

16. The system according to claim 13 , wherein each of the logic gates comprises one of the following: an AND gate, an NAND gate, an AND gate and an inverter connected in series, and an NAND gate and an inverter connected in series.

17. A system for providing dual resolution control of a display panel, said system comprising:

a first pair and a second pair of shift registers, each of the shift registers outputting a shifting signal;

a first pair and a second pair of logic gates; and

a switching network coupled among the shifting registers and the logic gates;

wherein, in a low resolution mode, the switching network causes the shift registers to output shifting signals, the phase of the shift signals of the shift registers of the first pair are in-phase, the phase of the shift signals of the shift registers of the second pair are in-phase, with corresponding pulses of the shifting signals of the shift registers of the first pair temporally overlapping with corresponding pulses of the shifting signals of the shift registers of the second pair; and

wherein, responsive to the shifting signals, the logic gates output panel control signals, with corresponding pulses of the panel control signals of the logic gates of the first pair not temporally overlapping with corresponding pulses of the panel control signals of the logic gates of the second pair, and

wherein the first, the second, the third and the fourth shift registers are not cascaded successively.