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US 4,680,580 AGranted
Active matrix-addressed liquid-crystal display device
AssigneeKabushiki Kaisha Daini Seikosha
InventorYukito Kawahara
Life of this patent
Estimating the term…
Abstract
An active matrix-addressed liquid crystal panel comprising plural matrix picture elements is disclosed. The defects of a picture caused by a short between a row electrode and a substrate is inconspicious because each row electrode controls the picture elements belonging to the row as well as the picture elements belonging to the neighboring rows.
Claims20
An active matrix-addressed liquid-crystal display device comprising:
- a semiconductor substrate, a transparent substrate, and a liquid crystal sandwiched between said semiconductor substrate and said transparent substrate, said semiconductor substrate comprising matrix liquid-crystal driving cells each comprised of a capacitor for holding a signal voltage to drive the liquid crystal, an electrode for driving the liquid crystal corresponding to a unit picture element, and a switching element having a gate for addressing each of the picture elements, column electrodes to apply a signal voltage for driving the liquid crystal, and row electrodes for scanning the gates to address said switching elements, wherein said switching elements belonging to some of the rows comprise MOS transistors connected in parallel to different row electrodes.
An active matrix-addressed liquid crystal display device comprising:
- a semiconductor substrate;
- a transparent substrate spaced from the semiconductor substrate;
- liquid crystal material sandwiched between the semiconductor and transparent substrates;
- a matrix of liquid crystal cells formed on the semiconductor substrate in a row-by-column matrix, each cell comprising a driving electrode for driving a region of the liquid crystal material corresponding to a unit picture element, a capacitor for holding a signal voltage to be applied to the driving electrode, and a MOS transistor having a gate for addressing the picture element to enable a signal voltage to be applied to the capacitor;
- column electrodes for applying signal voltages to the columns of MOS transistors;
- row electrodes for applying a scanning voltage to the gates of the rows of MOS transistors;
- and means operative, when one of the row electrodes is ineffective to apply the scanning voltage to a given row of MOS transistors, for applying to the capacitors in that given row the same signal voltages as applied to the capacitors in a neighboring row.
4 more elements
An active matrix-addressed liquid crystal display device comprising:
- a semiconductor substrate;
- a transparent substrate spaced from the semiconductor substrate;
- liquid crystal material sandwiched between the semiconductor and transparent substrates;
- a matrix of liquid crystal cells formed on the semiconductor substrate in a row-by-column matrix, each cell comprising a driving electrode for driving a region of the liquid crystal material corresponding to a unit picture element, a capacitor for holding a signal voltage to be applied to the driving electrode, and a MOS transistor having a gate for addressing the picture element to enable a signal voltage to be applied to the capacitor;
- column electrodes for applying signal voltages to the columns of MOS transistors;
- row electrodes for applying a scanning voltage to the gates of the rows of MOS transistors;
- and means for applying to a given row electrode of a given row of picture elements the same scanning voltage as applied to a neighboring row electrode of a neighboring row of picture elements in the event that given row electrode becomes inoperative thereby preventing the occurrence of a blank row of picture elements in the displayed picture.
4 more elements
Dependencies are inferred from the claim text.