Active matrix type liquid crystal display system and driving method therefor

An active matrix liquid crystal display system having a plurality of switching elements comprising:

• a pair of substrates;
• signal electrode lines and scanning electrode lines formed on one of said pair of the substrates and crossing each other in a matrix form;
• a plurality of pixels formed by adjoining said signal electrode lines and said scanning electrode lines;
• and
• a liquid crystal layer interposed between said pair of the substrates;
• wherein each pixel of said pixels comprises an electrode structure for generating an electric field having a component substantially in parallel with one of said pair of said substrates upon application of at least one predetermined voltage thereto, a scanning signal having at least two kinds of non-selective voltage values is applied to said scanning electrode line, and a common voltage having at least two kinds of voltage values is applied to at least one counter electrode.

An active matrix liquid crystal display system having a plurality of switching elements comprising:

• a pair of substrates;
• signal electrode lines and scanning electrode lines formed on one of said pair of the substrates and crossing each other in a matrix form;
• a plurality of pixels formed by adjoining said signal electrode lines and said scanning electrode lines;
• and
• a liquid crystal layer interposed between said pair of the substrates;
• wherein each pixel of said pixels comprises an electrode structure for generating an electric field having a component substantially in parallel with one of said pair of said substrates upon application of at least one predetermined voltage thereto, a counter electrode connected to said scanning electrode line, and at least one switching element having a threshold voltage which is larger than zero, and a scanning signal having at least two kinds of non-selective voltage values is applied to said scanning electrode line.

An active matrix liquid crystal display system having a plurality of switching elements comprising:

• a pair of substrates;
• signal electrode lines and scanning electrode lines formed on one of said pair of the substrates and crossing each other in a matrix form;
• a plurality of pixels formed by adjoining said signal electrode lines and said scanning electrode lines;
• and
• a liquid crystal layer interposed between said pair of the substrates;
• wherein each pixel of said pixels comprises an electrode structure for generating an electric field having a component substantially in parallel with one of said pair of said substrates upon application of at least one predetermined voltage thereto, a counter electrode connected to said scanning electrode line, and a switching element corresponding to each of said scanning electrode lines being constructed so as to have p-type characteristics and n-type characteristics in alternating order by every row of said scanning electrode lines,
• to each of said scanning electrode lines having p-type switching transistor elements, a scanning signal which has at least two kinds of non-selective values higher than a non-selective voltage applied to said scanning electrode line having n-type switching transistor element being applied, and
• to each of said scanning electrode line having n-type switching transistor elements, a scanning signal which has at least two kinds of non-selective values lower than a non-selective voltage applied to said scanning electrode line having p-type switching transistor element being applied.

An active matrix liquid crystal display system having a plurality of switching elements comprising:

• a pair of substrates;
• signal electrode lines and scanning electrode lines formed on one of said pair of the substrates and crossing each other in a matrix form;
• a plurality of pixels formed by adjoining said signal electrode lines and said scanning electrode lines;
• and
• a liquid crystal layer interposed between said pair of the substrates;
• wherein a storage capacitance which is larger than a capacitance between a pixel electrode and a counter electrode is constructed in said pixel, and a scanning signal having at least two kinds of non-selective voltage values is applied to each pixel of said pixels for modulating a voltage of said pixel electrode.

An active matrix type liquid crystal display system comprising a first substrate having on one surface a plurality of scanning electrodes, a plurality of signal electrodes formed so as to intersect with said plural scanning electrodes, a switching element formed in each of the intersecting portions of said plural scanning electrodes and said plural signal electrodes having a threshold value V.sub.TH for said switching element which is larger than half of a difference between a maximum voltage V.sub.ON, between a pixel electrode and a counter electrode for obtaining light state or dark state, and a minimum voltage V.sub.OFF, between the pixel electrode and the counter electrode for obtaining light state or dark state, the pixel electrode being connected to said switching element, the counter electrode formed adjacent to said pixel electrode and connected to said scanning electrode;

• a second substrate spaced from said first substrate;
• a liquid crystal composition interposed in a gap between said first substrate and said second substrate;
• a scanning driver applying a scanning signal to each of said plural scanning electrodes;
• a signal driver supplying an image signal to each of the plural signal electrodes;
• where voltage is applied between said pixel electrode and said counter electrode to give an electric field having a component substantially in parallel to at least one of said first and second electrodes to said liquid crystal component and to produce display;
• wherein:
• a scanning signal, which has values of the non-selective voltages in alternate order by every frame and being kept at a constant voltage during a non-selective period, is applied to the scanning electrode.

An active matrix type liquid crystal display system comprising a first substrate having on one surface a plurality of scanning electrodes, a plurality of signal electrodes formed so as to intersect with said plural scanning electrodes, a switching element formed in each of the intersecting portions of said plural scanning electrodes and said plural signal electrodes, a pixel electrode having p-type characteristic and n-type characteristic in alternate order by each row of the plural scanning electrodes connected to said switching element, a counter electrode formed adjacent to said pixel electrode;

• a second substrate spaced from said first substrate;
• a liquid crystal composition interposed in a gap between said first substrate and said second substrate;
• a scanning driver applying a scanning signal to each of said plural scanning electrodes;
• a signal driver supplying an image signal to each of the plural signal electrodes;
• where voltage is applied between said pixel electrode and said counter electrode to give an electric field having a component substantially in parallel to at least one of said first and second substrates to said liquid crystal component and to produce display;
• wherein:
• a voltage of a non-selective voltage in the scanning signal applied to the scanning electrode having a p-type switching transistor element is higher than a voltage of a non-selective voltage in the scanning signal applied to the scanning electrode having an n-type switching transistor element, a voltage difference exceeding a maximum voltage V.sub.ON between the pixel electrode and the counter electrode for obtaining a light state or a dark state.

An active matrix type liquid crystal display system comprising a first substrate having on one surface a plurality of scanning electrodes, a plurality of signal electrodes formed so as to intersect with said plural scanning electrodes, a first switching element, a second switching element having a source electrode or drain electrode connected to one of said plural scanning electrodes, a pixel electrode connected to one of said first and second switching elements, a counter electrode formed adjacent to said pixel electrode;

• a second substrate spaced from said first substrate;
• a liquid crystal composition interposed in a gap between said first substrate and said second substrate;
• a scanning driver applying a scanning signal to each of said plural scanning electrode;
• a signal driver supplying an image signal to each of the plural signal electrodes;
• where voltage is applied between said pixel electrode and said counter electrode to give an electric field having a component substantially in parallel to at least one of said first and second substrates to said liquid crystal component and to produce display;
• wherein:
• the counter electrode voltage is supplied from said scanning electrode.