Data line driver for applying brightness signals to a display

A data line driver for developing a signal containing picture information in pixels arranged in a given column of a display device, comprising:

• a source of a data ramp signal;
• a first transistor coupled to said source of data ramp signal for applying said data ramp signal to a data line associated with said column;
• a first switching arrangement for precharging a capacitance that is formed with respect to a control terminal of said first transistor;
• a second transistor for generating a first portion of a control voltage of said first transistor that varies in accordance with a variation of a threshold voltage of one of said first and second transistors;
• a third transistor for varying a charge in said precharged capacitance until a control voltage of said second transistor becomes equal to said threshold voltage of said second transistor;
• a source of a pulse voltage;
• a first capacitance for coupling said pulse voltage to said control terminal to generate a second portion of said control voltage, said control voltage conditioning said first transistor for operation in a first switching state;
• and
• a source of a video signal and a source of a reference ramp signal coupled to an input of said second transistor for disabling said first switching state when a signal that is developed at said second transistor input from said video and reference ramp signals exceeds a threshold voltage of said second transistor.

A data line driver for developing a signal containing picture information in pixels arranged in a given column of a display device, comprising:

• a source of a data ramp signal;
• a first transistor coupled to said source of data ramp signal for applying said data ramp signal to a data line associated with said column;
• a second transistor coupled to a control terminal of said first transistor for generating a first portion of a control voltage at said control terminal of said first transistor at a magnitude established by of a threshold voltage of said second transistor;
• a first capacitance;
• a source of a pulse voltage capacitively coupled to a second capacitance that is formed with respect to said control terminal of said first transistor via said first capacitance such that said first and second capacitances form a voltage divider with respect to said pulse voltage for generating a second portion of said control voltage, said first and second portions of said control voltage being combined to condition said first transistor for operation in a first conduction state;
• a source of video signal coupled to a control terminal of said second transistor;
• and
• a source of reference ramp signal coupled to said control terminal of said second transistor for applying a signal that is developed at said control terminal of said second transistor to said control terminal of said first transistor in a manner to change said first conduction state to a second conduction state in accordance with a difference between said signal that is developed at said control terminal of said second transistor and said threshold voltage of said second transistor.

A data line driver for developing a signal containing picture information in pixels arranged in a given column of a display device, comprising:

• a source of a data ramp signal;
• a first transistor coupled to said source of data ramp signal for applying said data ramp signal to a data line associated with said column;
• a comparator coupled to said first transistor;
• a source of a second ramp signal capacitively coupled to a control terminal of said first transistor for generating a control voltage of said first transistor to condition said first transistor for operation in a first switching state such that said second ramp signal is coupled to said first transistor in a manner that bypasses said comparator;
• and
• a source of a video signal and a source of a reference ramp signal coupled to an input of said comparator for disabling said first switching state when a signal that is developed at said comparator input from said video and reference ramp signals exceeds a triggering level of said comparator.