Liquid crystal display system capable of improving display quality and method for driving the same
View Patent ↗Systems for displaying images incorporates a display device that includes a plurality of gate lines, a plurality of data lines intersecting the plurality of gate lines, a plurality of switches each having a first end coupled to a corresponding gate line and a second end coupled to a corresponding data line, a plurality of storage units each coupled to a third end of a corresponding switch for storing data received from a corresponding data line, a power line formed in parallel with the plurality of gate lines, and a plurality of coupling capacitors each having a first end coupled to the power line and a second end coupled to a corresponding data line.
1. A liquid crystal display (LCD) system comprising:
an LCD device comprising:
a plurality of gate lines;
a plurality of data lines intersecting the plurality of gate lines;
a plurality of first switches each having a first end coupled to a corresponding gate line and a second end coupled to a corresponding data line;
a plurality of storage units each coupled to a third end of a corresponding first switch for receiving data from the corresponding data line;
a first power line formed in parallel with the plurality of gate lines;
a plurality of first coupling capacitors each having a first end coupled to the first power line and a second end coupled to the corresponding data line;
a source driving circuit coupled to the plurality of data lines for providing data signals; and
a plurality of demultiplexers coupled between the source driving circuit and the plurality of corresponding data lines for:
sequentially outputting the data signals to the plurality of data lines after a corresponding first switch coupled to the corresponding gate line and the corresponding data line is turned on;
keeping the plurality of data lines at a floating level after outputting the data signals;
generating a coupling voltage by changing a voltage level of the first power line from a first voltage level to a second voltage level; and
sequentially transmitting the coupling voltage to the data lines via the plurality of first coupling capacitors.
2. The LCD system of claim 1 further comprising:
a second power line formed in parallel with the plurality of gate lines; and
a plurality of second coupling capacitors each having a first end coupled to the second power line and a second end coupled to the corresponding data line.
3. The LCD system of claim 1 further comprising a control circuit coupled to the first and second power lines for controlling voltage levels of the first and second power lines.
4. The LCD system of claim 1 further comprising:
a gate driving circuit coupled to the plurality of gate lines for transmitting control signals to the plurality of first switches via the corresponding gate lines.
5. The LCD system of claim 1 wherein each demultiplexer includes a plurality of second switches coupled to the source driving circuit and the data lines for controlling signal transmission paths through which the data signals are transmitted from the source driving circuit to the data lines.
6. The LCD system of claim 5 wherein the second switches include thin film transistors (TFTs).
7. The LCD system of claim 1 wherein the first switches include TFTs.
8. The LCD system of claim 1 further comprising an electronic device including:
the LCD device; and
a controller coupled to the LCD device for providing an input signal based on which the LCD device displays images.
9. A method for driving an LCD system comprising:
turning on a first switch in a pixel unit coupled to a gate line for receiving a data signal from a corresponding data line;
sequentially outputting data signals to a plurality of data lines via a demultiplexer;
turning off the demultiplexer for keeping the plurality of data lines at a floating level;
generating a coupling voltage by changing a voltage level of a power line from a first voltage level to a second voltage level, and transmitting the coupling voltage to a first data line of the demultiplexer via a coupling capacitor coupled between the power line and the first data line; and
turning off the first switch in the pixel unit coupled to the gate line after generating the coupling voltage.
10. The method of claim 9 wherein sequentially outputting the data signals to the plurality of data lines via the demultiplexer is a source driving circuit sequentially outputting the data signals to the plurality of data lines via the demultiplexer.
11. The method of claim 9 further comprising:
generating a coupling voltage by changing the voltage level of the power line from the second voltage level to the first voltage level, and transmitting the coupling voltage to a second data line of the demultiplexer via a coupling capacitor coupled between the power line and the second data line.
12. The method of claim 9 wherein changing the voltage level of the power line from the first voltage level to the second voltage level is changing the voltage level of the power line from a high voltage level to a low voltage level.
13. The method of claim 9 wherein changing the voltage level of the power line from the first voltage level to the second voltage level is changing the voltage level of the power line from a low voltage level to a high voltage level.
14. A method for driving an LCD system comprising:
turning on a switch in a pixel unit coupled to a gate line for receiving a data signal from a corresponding data line;
outputting data signals to a plurality of data lines using a source driving circuit;
terminating outputting the data signals to the plurality of data lines for keeping the plurality of data lines at a floating level;
generating a coupling voltage by changing a voltage level of a power line from a first voltage level to a second voltage level, and transmitting the coupling voltage to a first data line via a coupling capacitor coupled between the power line and the first data line after keeping the plurality of data lines at the floating level; and
turning off the switch in the pixel unit coupled to the gate line after generating the coupling voltage.
15. The method of claim 14 further comprising:
generating a coupling voltage by changing the voltage level of the power line from the second voltage level to the first voltage level, and transmitting the coupling voltage to a second data line via a coupling capacitor coupled between the power line and the second data line.
16. The method of claim 14 wherein changing the voltage level of the power line from the first voltage level to the second voltage level is changing the voltage level of the power line from a high voltage level to a low voltage level.
17. The method of claim 14 wherein changing the voltage level of the power line from the first voltage level to the second voltage level is changing the voltage level of the power line from a low voltage level to a high voltage level.