Method of driving liquid crystal display and liquid crystal display using the driving method

A method of driving a liquid crystal display comprising plural pixel electrodes connected to plural thin-film transistors for switching that are switched according to a pulse width modulation driving system and a thin-film transistor for monitoring formed at the same time as the thin-film transistors for switching and disposed on the liquid crystal display panel, wherein the method comprises:

• setting a positive gate-on voltage (VGONP) and a negative gate-on voltage (VGONN) of the thin-film transistors based upon the temperature of the liquid crystal display panel;
• using the pulse width modulation driving system for modulating the pulse width of a data signal;
• and
• using the thin-film transistor for monitoring for setting the positive gate-on voltage (VGONP) and the negative gate-on voltage (VGONN) of the thin-film transistors for switching so that the ON-state current (ION) of the thin-film transistors for switching.

A method of driving a liquid crystal display panel comprising plural pixel electrodes connected to plural thin-film transistors for switching that are switched according to a pulse width modulation driving system, wherein the method comprises:

• setting a positive gate-on voltage (VGONP) and a negative gate-on voltage (VGONN) of the thin-film transistors based upon a temperature of the liquid crystal display panel;
• using the pulse width modulation driving system for modulating the pulse width of a data signal, wherein:
• each displayed gradation is represented by the number of clocks;
• a reference clock signal is counted by a counter;
• gradation data and the output of the counter are compared and the pulse width (TW) of the data signal is set;
• and
• a frequency of the reference clock signal is varied according to the temperature of the liquid crystal display panel provided by a temperature detecting means.

A method of driving a liquid crystal display panel comprising plural pixel electrodes connected to plural thin-film transistors for switching that are switched according to a pulse width modulation driving system, wherein the method comprises:

• setting a positive gate-on voltage (VGONP)and a negative gate-on voltage (VGONN) of the thin-film transistors based upon a temperature of the liquid crystal display panel;
• using the pulse width modulation driving system for modulating the pulse width of a data signal, wherein:
• each displayed gradation is represented by the number of clocks;
• a reference clock signal is counted by a counter;
• gradation data and the output of the counter are compared and the pulse width (TW) of the data signal is set;
• and
• a frequency of the reference clock signal is set using a thin-film transistor for monitoring formed at the same time as the thin-film transistors for switching so that the frequency is proportional to the ON-state current (ION) of the thin-film transistor for monitoring.