DISPLAY DEVICE AND METHOD OF DRIVING SAME
Embodiments of the present invention operate at least two microshutter electrodes with different voltages from each other for displaying grays. Also, a data voltage is applied to the microshutter electrodes after an initialization voltage when the display device has hysteresis characteristics such that erroneous operation due to the hysteresis characteristics is eliminated. As described herein, the display device including the microshutter electrodes may display subdivided grays.
1 . A display device comprising:
an insulation substrate;
a pixel electrode formed on the insulation substrate, and made of a transparent conductive material;
an insulating layer disposed on the pixel electrode; and
at least two microshutter electrodes, wherein the microshutter electrodes are:
disposed on the insulating layer,
made of a non-transparent conductive material for blocking light,
electrically connected to each other so that a same voltage is applied to both, and
opened and closed by applying different voltages.
2 . The display device of claim 1 , wherein the microshutter electrodes are opened and closed through a static electricity force between the microshutter electrodes and the pixel electrode, and an elastic force of the microshutter electrodes.
3 . The display device of claim 2 , wherein the microshutter electrodes have different elastic forces.
4 . The display device of claim 3 , wherein the microshutter electrodes have uniform widths.
5 . The display device of claim 3 , wherein the microshutter electrodes have different widths.
6 . The display device of claim 3 , wherein:
the microshutter electrodes have a high stress portion meeting a portion where they are moved, and a fixed portion where they are fixed to each other, and
the widths of the high stress portions of the microshutter electrodes are different.
7 . The display device of claim 3 , further comprising an additional film covering the high stress portion, wherein:
the microshutter electrodes have a high stress portion meeting a portion where they are moved and a fixed portion where they are fixed to each other, and
the additional film has different lengths or is included at a different number per microshutter electrode.
8 . The display device of claim 3 , wherein the microshutter electrodes are made of different materials.
9 . The display device of claim 3 , further comprising an additional film covering the microshutter electrodes, wherein the additional film has different lengths per microshutter electrode.
10 . The display device of claim 2 , wherein the static electricity forces between the pixel electrode and the microshutter electrodes are different from each other.
11 . The display device of claim 10 , wherein the pixel electrode includes at least two small portions corresponding to the microshutter electrodes and separated from each other by a predetermined interval.
12 . The display device of claim 11 , wherein a central line of the small portions accord with a central line of the microshutter electrodes.
13 . The display device of claim 11 , wherein overlapping widths between the small portions and the microshutter electrodes are the same.
14 . The display device of claim 11 , wherein overlapping widths between the small portions and the microshutter electrodes are different from each other.
15 . The display device of claim 11 , wherein one end of each of the small portions are connected to each other.
16 . The display device of claim 1 , further comprising a light blocking member blocking light transmitted between the microshutter electrodes.
17 . The display device of claim 1 , further comprising a thin film transistor electrically connected to the pixel electrode or the microshutter electrodes.
18 . The display device of claim 1 , further comprising:
a gate line;
a data line; and
a switching transistor and a reset transistor each including, respectively, a gate electrode, a source electrode, and a drain electrode,
wherein the gate electrode of the switching transistor is connected to a corresponding gate line, the source electrode of the switching transistor is connected to a data line, and the drain electrode of the switching transistor is connected to the microshutter electrodes, and
the gate electrode of the reset transistor is connected to a previous gate line, the source electrode of the reset transistor is connected to the pixel electrode, and the drain electrode of the reset transistor is connected to the microshutter electrodes.
19 . A method for driving a display device that includes a pixel electrode made of a transparent conductive material; at least two microshutter electrodes made of a non-transparent conductive material for blocking light, electrically connected to each other so that the same voltage is applied to each, and opened and closed through different voltages; a gate line; a data line; and a thin film transistor connected to the gate line, the data line, and the pixel electrode or the microshutter electrodes; the method comprising:
applying a gate-on voltage to the gate line; and
alternately applying a reset voltage and a data voltage to the data line, wherein:
the reset voltage and the data voltage are applied for at least respective portions of a time during which the gate-on voltage is applied, and
the reset voltage is applied before the data voltage.
20 . The method of claim 19 , wherein the reset voltage is a voltage to initialize all of the microshutter electrodes.