Image display device and drive method thereof
View Patent ↗The object of present invention is to provide a image display device with a simple constitution and a method for driving the image display device. The image display device of the present invention comprises a plurality of stripe-like data electrodes, a light emitting layer, and a plurality of stripe-like scanning electrode formed on a substrate in sequence, and further comprises a image display portion formed by a plurality of light emitting elements in a matrix form at crossing points between said data electrodes and said scanning electrodes, and a column driving circuit and a row driving circuit for driving said image display portion by selecting and lighting the light emitting elements: wherein the row driving circuit has a function to simultaneously drive more than two of said scanning electrodes and successively lighting the horizontal regions in sequence corresponding to the number of scanning electrodes for simultaneously driving said light emitting elements; and the column driving circuit has a function to control a current flowing in said data electrodes such that a current density of said light emitting element is maintained at constant.
1. An electroluminescent (EL) image display device which comprises a plurality of stripe-like data electrodes, a light emitting layer, and a plurality of stripe-like scanning electrodes formed on a substrate in sequence, and further comprises an image display portion formed by a plurality of light emitting elements in a matrix form at crossing points between said data electrodes and said scanning electrodes, and a column driving circuit and a row driving circuit for driving said image display portion by selecting and lighting said light emitting elements: wherein,
said row driving circuit simultaneously drives more than two of said scanning electrodes and successively lighting horizontal regions in sequence corresponding to the number of simultaneously driven scanning electrodes; and
said column driving circuit controls a current flowing in said data electrodes such that the current through said data electrodes is proportional to the number of simultaneously driven scanning electrodes.
2. An image display device according to claim 1 , wherein said image display portion is divided into a plurality of image display portions for displaying images by at least two image display regions by dividing said plurality of scanning electrodes into at least two regions.
3. An image display device according to claim 2 , wherein said light emitting element is selected from the group consisting of a EL element, a light emitting diode, or an FED.
4. A method for driving an image display device which comprises a plurality of stripe-like data electrodes, a light emitting layer, and a plurality of stripe-like scanning electrodes formed on a substrate in sequence, and further comprises a image display portion formed by a plurality of light emitting elements in a matrix form at crossing points between said data electrodes and said scanning electrodes, and a column driving circuit and a row driving circuit for driving said image display portion by selecting and lighting said light emitting elements: wherein the method comprises the steps of:
driving simultaneously more than two of said scanning electrodes adjacent to each other for lighting said light emitting elements in a horizontal region corresponding to the number of simultaneously driven scanning electrodes; and
controlling the current flowing in said data electrodes such that the current through said data electrodes is proportional to the number of simultaneously driven scanning electrodes.