Apparatus for maintaining average screen light level for ferroelectric liquid crystal display

An apparatus for maintaining an average light level of a screen for a ferroelectric liquid crystal display (LCD), the apparatus comprising:

• an average light level detector for detecting an average light level of an input signal based on a predetermined pixel value of the input signal;
• a system controller for providing a predetermined reference average light level;
• and
• a screen light adjuster for receiving the average light level of the input signal output from the average light level detector and the reference average light level provided by the system controller, adjusting a light level of the screen so that the average light level of the screen becomes substantially equal to the reference average light level thereby to cause the average light level of the screen to not vary from frame-to-frame;
• wherein the average light level detector sums a frame of the input signal, selects an arbitrary upper bit value from the summation result, and determines the selected upper bit value to be the average light level.

An apparatus for maintaining an average light level of a screen for a ferroelectric liquid crystal display (LCD), the apparatus comprising:

• an average light level detector for detecting an average light level of an input signal based on a predetermined pixel value of the input signal;
• a system controller for providing a predetermined reference average light level;
• and
• a screen light adjuster for receiving the average light level of the input signal output from the average light level detector and the reference average light level provided by the system controller, adjusting a light level of the screen so that the average light level of the screen becomes substantially equal to the reference average light level thereby to cause the average light level of the screen to not vary from frame-to-frame;
• wherein the average light level detector determines the average light level by summing arbitrary upper bits of each line contained in a frame of the input signal.

An apparatus for maintaining an average light level of a screen for a ferroelectric liquid crystal display (LCD), the apparatus comprising:

• an average light level detector for detecting an average light level of an input signal based on a predetermined pixel value of the input signal;
• a system controller for providing a predetermined reference average light level;
• and
• a screen light adjuster for receiving the average light level of the input signal output from the average light level detector and the reference average light level provided by the system controller, adjusting a light level of the screen so that the average light level of the screen becomes substantially equal to the reference average light level thereby to cause the average light level of the screen to not vary from frame-to-frame;
• wherein the average light level detector determines the average light level by summing pixel values of arbitrary regions of one frame of the input signal.