US 6,552,706 B1 · Active matrix type liquid crystal display apparatus

Abstract

An active matrix type liquid crystal display apparatus can reduce occurrence of flicker, which can be a cause of degradation of picture quality even in a particular fixed pattern, by using a data driver circuit constantly inverting polarity of voltage of adjacent outputs. The active matrix type liquid crystal display apparatus has display picture elements, each consisting of four pixels of first to four pixels arranged vertically and horizontally per two, scanning lines, each being in common for the four pixels, data lines arranged per two on opposite sides of vertically aligned two pixels, a common electrode being common for the four pixels, and a data driver circuit for writing voltages from the datalines simultaneously for the four pixels of each picture element when the one scanning line is selected. The pixels are located at the same position in laterally adjacent picture elements being connected to data lines at different sides relative to each other. The data driver circuit is controlled to apply different polarities of voltages to adjacent data lines with respect to a voltage for the common electrode, and to invert polarities of the voltages to be applied to respective data lines with respect to the voltage of the common electrode when the scanning line is selected.

Claims9

Dependent claims

An active matrix type liquid crystal display apparatus comprising:

display picture elements, each consisting of four pixels of first to four pixels arranged vertically and horizontally per two;
scanning lines, each being in common for said four pixels;
data lines arranged per two on opposite sides of vertically aligned two pixels;
a common electrode being common for said four pixels;
a data driver circuit for writing voltages from said data lines simultaneously for said four pixels of each picture element when said one scanning line is selected,
said pixels located at the same position in laterally adjacent picture elements being connected to data lines at different sides relative to each other;
and
said data driver circuit being controlled to apply opposite polarities of voltages to adjacent data lines with respect to a voltage for said common electrode, and to invert polarities of the voltages to be applied to respective data lines with respect to the voltage of said common electrode when said scanning line is selected.

5 more elements

An active matrix type liquid crystal display apparatus comprising:

a plurality of mutually parallel data lines;
a plurality of mutually parallel scanning lines arranged perpendicular to said data lines;
field effect type transistors, each provided in the vicinity of each intersection of said data line and said scanning line;
pixel electrodes, each connected to said field effect type transistor;
a common electrode;
liquid crystal provided between said pixel electrodes and said common electrode, each four pixels forming one picture element;
a scanning circuit sequentially applying voltages to said scanning lines;
a data driver circuit receiving a display data and applying voltages corresponding said display data for said data lines;
said display driver circuit controlling application of voltage
so that polarities of the voltages to be applied to first, second, third and fourth pixels of a first picture element at an arbitrary position of a display portion relative to a voltage of said common electrode are the same polarity in said first and second pixels, the same polarity in said third and fourth pixels and opposite polarity in said first and third pixels;
so that polarities of voltages to be applied to said first to fourth pixels of said first picture element relative to the voltage of said common electrode being inverted at a period of a frame frequency;
so that polarities of voltages to be applied to fifth, sixth, seventh and eighth pixels located at the corresponding position to said first pixel in second, third, fourth and fifth picture elements adjacent to said first picture element in vertical and lateral directions are opposite to the polarity of the voltage to be applied to said first pixel;
so that the polarities of voltages to be applied to ninth, tenth, eleventh and twelfth pixels located at the corresponding position to said first pixel in sixth, seventh, eighth and ninth picture elements obliquely adjacent to said first picture element respectively located at obliquely upper left side, obliquely upper right side, obliquely lower left side and obliquely lower right side are the same as the polarity of the voltage to be applied to said first pixel.

10 more elements

Dependencies are inferred from the claim text.

Active matrix type liquid crystal display apparatus

Life of this patent

Active matrix type liquid crystal display apparatus

Life of this patent

Abstract

Claims9