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US 2008/0278643 A1Published application
Liquid crystal display apparatus
AssigneeStanley Electric Co., Ltd.
InventorYoshihisa IWAMOTO
Life of this patent
Estimating the term…
Abstract
A mono domain vertical alignment type liquid crystal display apparatus to be multiplex driven is provided whose display uniformity at a large pretilt angle (near 90°) is improved. Waveform A is applied to a liquid crystal cell of a mono domain vertical alignment type, the waveform A having a duty not lower than 4 and a frame frequency of f. The frame frequency f is determined from a pretilt angle θp, and is a frequency not lower than 60 Hz at a pretilt angle of 88.5°≦p<89.6° or a frequency not lower than [120×(θp−89.6)+60] Hz at a pretilt angle of 89.6°≦θp≦89.9°.
Claims21
A liquid crystal display apparatus comprising:
- a liquid crystal cell of a mono domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the mono domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second vertical alignment films formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, and subjected to antiparallel rubbing to give liquid crystal molecules in said liquid crystal layer with a pretilt angle θp in a range between 88.5 and 89.9° and with mono domain alignment;
- said driver apparatus applies said liquid crystal cell with waveform A having a duty not lower than 4 and a frame frequency of f;
- and
- said frame frequency f is determined from said pretilt angle θp, and is a frequency not lower than 60 Hz at a pretilt angle of 88.5°≦θp<89.6° or a frequency not lower than [120×(θp−89.6)+60] Hz at a pretilt angle of 89.6°≦θp≦89.9°.
8 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of a mono domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the mono domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second vertical alignment films formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, and subjected to antiparallel rubbing to give liquid crystal molecules in said liquid crystal layer with a pretilt angle θp in a range between 88.5° and 89.9° and with mono domain alignment;
- said driver apparatus applies said liquid crystal cell with waveform B having a duty not lower than 4 and a frame frequency of f;
- and
- said frame frequency f is determined from said pretilt angle θp, and is a frequency not lower than 60 Hz at a pretilt angle of 88.5°≦θp≦88.8° or a frequency not lower than [312×(θp−88.8)+60] Hz at a pretilt angle of 88.8°≦θp≦89.9°.
8 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of a mono domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the mono domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second vertical alignment films formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, and subjected to antiparallel rubbing to give liquid crystal molecules in said liquid crystal layer with a pretilt angle θp in a range between 88.5° and 89.9° and with mono domain alignment;
- said driver apparatus applies said liquid crystal cell with waveform B having a duty not lower than 4 and a frame frequency of f;
- and
- said frame frequency f is determined from said pretilt angle θp, and is a frequency not lower than 100 Hz at a pretilt angle of 88.5°≦θp<89.0° or a frequency not lower than [312×(θp−89.0)+100] Hz at a pretilt angle of 89.0°≦θp≦89.9°.
8 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of a mono domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the mono domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second vertical alignment films formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, and subjected to antiparallel rubbing to give liquid crystal molecules in said liquid crystal layer with a pretilt angle θp in a range between 88.5° and 89.9° and with mono domain alignment;
- said driver apparatus applies said liquid crystal cell with waveform C having a duty not lower than 4, a frame frequency of f and a polarity reversal line number M not smaller than 1 and not larger than a half the duty number;
- and
- said frame frequency f is determined from said pretilt angle θp, and is a frequency not lower than 60 Hz at a pretilt angle of 88.5°≦θp<89.2° or a frequency not lower than [216×(θp−89.2)+60] Hz at a pretilt angle of 89.2°≦θp≦89.9°.
8 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of a mono domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the mono domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second vertical alignment films formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, and subjected to antiparallel rubbing to give liquid crystal molecules in said liquid crystal layer with a pretilt angle θp in a range between 88.5° and 89.9° and with mono domain alignment;
- said driver apparatus applies said liquid crystal cell with waveform C having a duty not lower than 4, a frame frequency off and a polarity reversal line number M not smaller than 1 and not larger than the duty number;
- and
- said frame frequency f is determined from said pretilt angle θp, and is a frequency not lower than 60 Hz at a pretilt angle of 88.5°≦θp<88.8° or a frequency not lower than [312×(θp−88.8)+60] Hz at a pretilt angle of 88.8°θp≦89.9°.
8 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of a mono domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the mono domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second vertical alignment films formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, and subjected to antiparallel rubbing to give liquid crystal molecules in said liquid crystal layer with a pretilt angle θp in a range between 88.5° and 89.9° and with mono domain alignment;
- said driver apparatus applies said liquid crystal cell with waveform MLS having a duty not lower than 4, a frame frequency of f and a simultaneous line select number N of not smaller than 2 and not larger than 4;
- and
- said frame frequency f is determined from said pretilt angle θp, and is a frequency not lower than 60 Hz at a pretilt angle of 88.5°≦θp<89.3° or a frequency not lower than [150×(θp−89.3)+60] Hz at a pretilt angle of 89.3°≦θp≦89.9°.
8 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of an oblique electric field alignment control multi domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the oblique electric field alignment control multi domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second electrode layers formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, a plurality of openings being formed through said first and second electrode layer, openings formed in said first electrode layer and openings formed in said second electrode layer being alternately disposed side by side along one direction in a display plane;
- and
- said driver apparatus applies said liquid crystal cell with waveform A having a frame frequency not lower than 60 Hz.
7 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of an oblique electric field alignment control multi domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the oblique electric field alignment control multi domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second electrode layers formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, a plurality of openings being formed through said first and second electrode layer, openings formed in said first electrode layer and openings formed in said second electrode layer being alternately disposed side by side along one direction in a display plane;
- and
- said driver apparatus applies said liquid crystal cell with waveform B having a frame frequency not lower than 300 Hz.
7 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of an oblique electric field alignment control multi domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the oblique electric field alignment control multi domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second electrode layers formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer a plurality of openings being formed through said first and second electrode layer, openings formed in said first electrode layer and openings formed in said second electrode layer being alternately disposed side by side along one direction in a display plane;
- and
- said driver apparatus applies said liquid crystal cell with waveform C having a polarity reversal line number M not smaller than 1 and not larger than a half the duty number of said waveform C and a frame frequency not lower than 200 Hz.
7 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of an oblique electric field alignment control multi domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the oblique electric field alignment control multi domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second electrode layers formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, a plurality of openings being formed through said first and second electrode layer, openings formed in said first electrode layer and openings formed in said second electrode layer being alternately disposed side by side along one direction in a display plane;
- and
- said driver apparatus applies said liquid crystal cell with waveform C having a polarity reversal line number M not smaller than 1 and not larger than the duty number of said waveform C and a frame frequency not lower than 300 Hz.
7 more elements
A liquid crystal display apparatus comprising:
- a liquid crystal cell of an oblique electric field alignment control multi domain vertical alignment type;
- and
- a driver apparatus for applying a driving waveform to said liquid crystal cell,
- wherein said liquid crystal cell of the oblique electric field alignment control multi domain vertical alignment type comprises:
- first and second substrates disposed facing each other;
- a liquid crystal layer sandwiched between said first and second substrates;
- and
- first and second electrode layers formed above said first substrate on a side of said liquid crystal layer and above said second substrate on a side of said liquid crystal layer, a plurality of openings being formed through said first and second electrode layer, openings formed in said first electrode layer and openings formed in said second electrode layer being alternately disposed side by side along one direction in a display plane;
- and
- said driver apparatus applies said liquid crystal cell with waveform MLS having a simultaneous select line number N not smaller than 2 and not larger than 4 and a frame frequency not lower than 150 Hz.
7 more elements
Dependencies are inferred from the claim text.