IMAGE DISPLAY DEVICE
An image display device includes: a mechanical shutter unit provided for each of pixels arrayed in a matrix shape and configured to move on a transparent substrate in parallel to the transparent substrate and perform transmission and blocking of light; a pair of control electrodes arranged on both side of the mechanical shutter unit on the transparent substrate; a control electrode driving circuit configured to apply a high voltage or a low voltage to the control electrodes; and a shutter control circuit provided for each of the pixels and configured to apply the high voltage or the low voltage set via a signal line to thereby electrostatically control the operation of the mechanical shutter unit.
1 . An image display device comprising:
a mechanical shutter unit provided for each of pixels arrayed in a matrix shape and configured to move on a transparent substrate in parallel to a surface of the transparent substrate and perform transmission and blocking of light;
a pair of control electrodes arranged on both side of the mechanical shutter unit on the transparent substrate;
a planar light source configured to emit light to the transparent substrate and arranged in parallel to the transparent substrate;
a light blocking film formed on the transparent substrate side on the planar light source, including an optical opening, which is opened for each of the pixels to correspond to a region where the mechanical shutter unit performs transmission and blocking of light, and configured to shield a region other than the optical opening from light emitted from the planar light source;
a control electrode driving circuit configured to apply a high voltage and a low voltage for the pair of control electrodes respectively to the control electrodes; and
a shutter control circuit provided for each of the pixels and configured to apply, at timing corresponding to a gradation value of each of the pixels, the high voltage or the low voltage set via a signal line to thereby electrostatically control an operation of the mechanical shutter unit,
wherein the light blocking film is formed of a dielectric.
2 . The image display device according to claim 1 , wherein the light blocking film includes a multilayer dielectric film having a reflection wavelength band of visible light.
3 . The image display device according to claim 2 , wherein
the light blocking film further includes a black resin film, and
the multilayer dielectric film is provided on the light source side, and
the black resin film is provided on the mechanical shutter unit side.
4 . The image display device according to claim 1 , wherein
the shutter control circuit is configured using an amorphous silicon thin film transistor.
5 . The image display device according to claim 1 , wherein the shutter control circuit is configured using an oxide thin film transistor.
6 . The image display device according to claim 1 , wherein voltage polarities of the pair of control electrodes are inverted for each column.
7 . The image display device according to claim 1 , wherein polarities of image signals written in the pixels are inverted for each column.
8 . The image display device according to claim 1 , wherein an electrode for a touch panel is provided on an opposite side of the surface of the transparent substrate on which the mechanical shutter unit is provided.
9 . The image display device according to claim 8 , wherein the touch panel is a capacitance type.
10 . The image display device according to claim 1 , wherein the shutter control circuit includes:
a first thin film transistor, one of a source electrode and a drain electrode of which is connected to the signal line, the other of the source electrode and the drain electrode of which is connected to a first node, and a gate electrode of which is connected to a scanning line;
a first storage capacitor, to one terminal of which the first node is connected and the other terminal of which is connected to a first control line; and
a second thin film transistor, to a gate electrode of which the first node is connected, a source electrode of which is connected to a second control line, and a drain electrode of which is connected to the mechanical shutter unit.
11 . The image display device according to claim 1 , wherein one wire that is connected to the control electrodes and traverses the pixel matrix is provided for each of the pixels.
12 . The image display device according to claim 1 , wherein a color filter is formed in the optical opening provided in the light blocking film.
13 . The image display device according to claim 12 , wherein
the light blocking film includes a multilayer dielectric film, and
the color filter has a configuration same as a configuration of a part of the multilayer dielectric film included in the light blocking film.
14 . The image display device according to claim 1 , wherein a protective film is formed on the light blocking film.
15 . The image display device according to claim 1 , wherein a capacitor is provided between the mechanical shutter unit and the control electrodes.
16 . The image display device according to claim 1 , wherein
the shutter control circuit includes:
a first thin film transistor, one of a source electrode and a drain electrode is connected to the signal line, the other of the source electrode and the drain electrode is connected to a first node, and a gate electrode of which is connected to a scanning line;
a first storage capacitor, one terminal of which is connected to the first node and the other terminal of which is connected to a first control line;
a third thin film transistor, to a gate electrode of which the first node is connected, a source electrode of which is connected to a second control line, and a drain electrode of which is connected to a second node;
a second storage capacitor, to one terminal of which the second node is connected and the other terminal of which is connected to a third control line; and
a fourth thin film transistor, to a gate electrode of which the second node is connected, a source electrode of which is connected to a fourth control line, and a drain electrode of which is connected to the mechanical shutter unit.
17 . The image display device according to claim 16 , wherein
the first control line and the fourth control line are a same control line, and
the image display device further comprises a fifth thin film transistor, to a gate electrode of which the second node is connected, to a source electrode of which a predetermined voltage is applied, and a drain electrode of which is connected to the mechanical shutter unit, the fifth thin film transistor having a conductive carrier characteristic different from a conductive carrier characteristic of the fourth thin film transistor.
18 . The image display device according to claim 16 , wherein the third control line and the fourth control line are a same control line.