Systems including level shifter having voltage distributor
View Patent ↗A level shifter includes a voltage distributor for receiving an input signal and respectively outputting a first signal and a second signal at a first node and a second node according to the input signal; and an output circuit coupled to the voltage distributor for generating an output signal according to the first signal and the second signal, wherein the voltage distributor includes: a first transistor having a first electrode, a second electrode coupled to the first node, and a first control electrode for receiving the input signal; a switch coupled between the first node and the second node for selectively establishing an electrical connection between the first and the second nodes; and a second transistor having a third electrode coupled to the second node, a fourth electrode, and a second control electrode coupled to the first node.
1. A system for displaying images, comprising:
a level shifter operative to transform an input signal having first low and high potential levels into an output signal having second low and high potential levels, the level shifter comprising:
a voltage distributor operative to receive the input signal and distribute potential levels at a first node and a second node to respectively output a first signal and a second signal according to the input signal, and the voltage distributor comprising:
a first transistor having a first electrode, a second electrode, and a first control electrode, wherein the second electrode is coupled to the first node, and the first control electrode receives the input signal;
a switch, electrically connected between the first node and the second node, operative to selectively establish an electrical connection between the first node and the second node; and
a second transistor having a third electrode, a fourth electrode, and a second control electrode, wherein the third electrode is coupled to the second node, and the second control electrode is directly connected to the first node; and
an output circuit, electrically connected to the voltage distributor, operative to generate the output signal according to the first signal and the second signal provided by the voltage distributor.
2. The system of claim 1 , wherein the second low potential is lower than the first low potential, and the second high potential is higher than the first high potential.
3. The system of claim 1 , wherein the first signal and the second signal have an inverted phase of the input signal.
4. The system of claim 1 , wherein the first transistor and the second transistor are opposite conductivity type transistors.
5. The system of claim 1 , wherein the switch is a third transistor having a third control electrode coupled to the second node, a fifth electrode coupled to the second node, and a sixth electrode coupled to the first node.
6. The system of claim 5 , wherein the switch is a PMOS transistor.
7. The system of claim 1 , further comprising a display panel, wherein the level shifter is coupled to the display panel and operative to provide the output signal to the display panel.
8. The system of claim 7 , further comprising an electronic device, wherein the electronic device comprises the display panel and the level shifter.
9. The system of claim 8 , wherein the electronic device is a mobile phone, digital camera, PDA (personal data assistant), notebook computer, desktop computer, television, car display, or portable DVD player.
10. The system of claim 1 , wherein the second control electrode is coupled to the first node regardless of an on/off status of the switch.