Display device and method for driving display device
AssigneeCasio Computer Co., Ltd.
InventorsKatsuhiko Morosawa, Tomoyuki Shirasaki
Life of this patent
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Abstract
A display device that displays image information in response to a display signal consisting of digital signals includes a display panel comprising a plurality of signal lines (DL) and a plurality of scanning lines (SL) which intersect at right angles with each other, and a plurality of display pixels (EM) sith optical emlem
Claims78
A display device for displaying image information according to a display signal consisting of digital signals comprising:
- a display panel (110A) comprising a plurality of signal lines (DL) and a plurality of scanning lines (SL) which intersect at right angles with each other, and a plurality of display pixels (EM) with optical elements arranged near the intersecting point of the plurality of signal lines and the plurality of scanning lines;
- a scanning driver circuit (120A, 120B) for sequentially applying a scanning signal to each of the scanning lines for setting the selective state of each line of each display pixel;
- and
- a signal driver circuit (130A-G) comprising a plurality of current generation circuits (ILA, ILB, ISA, ISB, ISC-F, PXA-D);
- the current generation circuits comprise at least a gradation current generation circuit (21A-D) and a drive current generation circuit;
- the gradation current generation circuit generates a plurality of gradation currents corresponding to each of the display signal bits based on constant, predetermined reference current, and the drive current generation circuit (22A-D) generates drive current from the plurality of gradation currents based on the value of the display signal which supplies the generated drive current to each signal line.
A display device for displaying image information according to display signals consisting of digital signals comprising:
- a display panel (110E) comprising a plurality of signal lines (DL) and a plurality of scanning lines (SL) which intersect at right angles with each other, and a plurality of display pixels (EP, EPa) arranged near the intersecting point of the plurality of signal lines and the plurality of scanning lines comprising at least an optical element formed of the current drive type and a current generation circuit (DCz, DCz′, DCza);
- the current generation circuit comprises a gradation current generation circuit for generating a plurality of gradation currents corresponding to each of the display signal bits based on predetermined, constant reference current;
- a drive current generation circuit for generating drive current based on the value of the display signal which supplies the drive current to the optical elements;
- a scanning driver circuit (120C) for sequentially applying a scanning signal for setting the selective state of each line of each scanning line;
- and
- a signal driver circuit (130H) for supplying the display signal to the plurality of signal lines.
A method for driving the display device which displays image information according to display signals consisting of digital signals in a display panel comprising a plurality of display pixels provided with optical elements arranged close to the intersecting point of a plurality of signal lines and a plurality of scanning lines, the method comprising:
- taking in and holding the display signal corresponding to the plurality of display pixels;
- generating drive current according to a value of the held display signal from a plurality of gradation currents generated corresponding to each of the display signal bits based on constant, predetermined reference current;
- and
- supplying the drive current to the plurality of signal lines.
Dependencies are inferred from the claim text.