DISPLAY DEVICE
[Problem] To provide a display device with a more uniform and wider view angle not dependent upon orientation. [Resolution Means] A display device equipped with a backlight for emitting a planar light; a first aperture layer ( 225 ) whose first aperture allows light from the backlight to pass therethrough; a mechanical shutter ( 228 ) electrically driven by a thin-film transistor, that controls a transmission of light that passes through the first aperture layer; a second aperture layer ( 212 ) whose second aperture that corresponds to the first aperture in the first aperture layer allows light that passes through the mechanical shutter to pass therethrough; and a high refractive index layer ( 214 ) that covers a second aperture of the second aperture layer, that is a transparent layer with a higher refractive index than a transparent fluid ( 221 ) filling a space between the first aperture layer and the second aperture layer; a thickness of the high refractive index layer in a central portion of the second aperture is formed to be less than a thickness of the high refractive index layer at edge portions of the second aperture.
1 . A display device, comprising:
a backlight that emits a planar light; and
a display panel that displays an image by controlling light emitted from the backlight using a microelectromechanical system shutter (MEMS shutter) provided in each pixel; wherein
one pixel has a first aperture layer having at least one opening with an anisotropic shape whose length in a direction substantially parallel to a movement direction of the MEMS shutter is short and whose length in a direction orthogonal thereto is long and
a second aperture layer provided with at least one opening, which is disposed to correspond to the opening of the first aperture layer, with the anisotropic shape whose length in the direction substantially parallel to the movement direction of the MEMS shutter is short and whose length in the direction orthogonal thereto is long;
in the one pixel, the MEMS shutter is provided between the first aperture layer and the second aperture layer and controls (switches) transmission and blocking of light passing through the first aperture layer by being electrically driven by a switching element;
a space between the first aperture layer and the second aperture layer in which the MEMS shutter is provided is filled with a transparent fluid;
a high refractive index layer, which is a transparent layer having a higher refractive index than the transparent fluid, is provided in the opening of the second aperture layer; and
a thickness of the high refractive index layer in a central portion of the opening of the second aperture layer is less than a thickness at an edge portion of the opening of the second aperture layer.
2 . The display device according to claim 1 , wherein the openings of the first aperture layer and the second aperture layer are both rectangular.
3 . The display device according to claim 1 , wherein the openings of the first aperture layer and the second aperture layer are both two or more in number.
4 . The display device according to any of claims 1 to 3 , wherein
the high refractive index layer is configured of
a first high refractive index layer configured of an organic material formed on the second aperture layer and
a second high refractive index layer configured of an inorganic material formed on the first high refractive index layer.
5 . The display device according to any of claims 1 to 4 , wherein
the high refractive index layer is formed of a material selected from among silicon oxide, titanium oxide, niobium oxide, or silicon nitride.
6 . The display device according to any of claims 1 to 5 , wherein
when a direction that is substantially parallel to the movement direction of the MEMS shutter and in which a length of an opening shape of the first and the second apertures is short is defined as a short axis direction, and when a direction that is orthogonal thereto and in which the length is long is defined as a long axis direction,
a half-value angle in the short axis direction is smaller than a half-value angle of the long axis direction for the intensity of light emitted from the backlight.
7 . The display device according to any of claims 1 to 6 , wherein
the backlight has a prism sheet having a ridge line that extends in the long axis direction of the openings of the first and the second aperture layers.