LCD with multi-color optical unit and cross dichroic device
The present invention relates to a backlight apparatus and a liquid crystal display apparatus, capable of realizing a backlight apparatus having high color reproductivity without color irregularities in a backlight apparatus having a LED device as its light source. In the optical unit 61 , there are disposed the dichroic mirror B which transmits green light Lg and red light Lr and reflects blue light Lb, the dichroic mirror G which transmits the light Lb and the light Lr and reflects the light Lg, and the dichroic mirror R which transmits the light Lb and the light Lg and reflects the light Lr, and they transmit or reflect the light emitted from the LED devices 11 B, 11 G and 11 R to mix to form the white light Lw. The light Lw formed by the dichroic mirrors B, G and R is entered to the light guiding plate 62 by the mirror performing a total reflection. Therefore, in the backlight apparatus having an LED device as its light source, it is possible to realize a backlight apparatus having high color reproductivity, without color irregularities.
1. A backlight apparatus having at least an optical unit, the optical unit comprising:
a first light source for emitting a first primary color light;
a second light source for emitting a second primary color light;
a third light source for emitting a third primary color light; and
a cross dichroic device having a first dichroic film for reflecting the first primary color light and transmitting the second primary color light and a second dichroic film for reflecting the third primary color light and transmitting the second primary color light, in an X-shape, for emitting white light by mixing the first, second and third primary color light.
2. A backlight apparatus having at least an optical unit, the optical unit, comprising:
a light source for emitting white light;
a first mirror surface body for transmitting a first polarized wave and reflecting a second polarized wave;
a second mirror surface body for transmitting the second polarized wave reflected by the first mirror surface body; and
a polarization converting device for converting the second polarized wave reflected by the second mirror surface body into the first polarized wave;
wherein a polarized wave to be emitted is emitted aligned with the first polarized wave.
3. The backlight apparatus according to claim 2 , characterized in that:
the light source is white light obtained by mixing each of primary color light emitted from a first light source for emitting a first primary color light, a second light source for emitting a second primary color light, and a third light source for emitting a third primary color light.
4. A liquid crystal display apparatus, characterized by comprising:
a backlight apparatus having at least an optical unit,
the optical unit having
a first light source for emitting a first primary color light,
a second light source for emitting a second primary color light,
a third light source for emitting a third primary color light, and
a cross dichroic device having a first dichroic film for reflecting the first primary color light and transmitting the second primary color light and a second dichroic film for reflecting the third primary color light and transmitting the second primary color light, in an X-shape, for emitting white light by mixing the first, second and third primary color light; and
a liquid crystal display panel for displaying an image by using light surface-emitted from the backlight apparatus.
5. A liquid crystal display apparatus, characterized by comprising:
a backlight apparatus having at least an optical unit,
the optical unit having
a light source for emitting white light,
a first mirror surface body for transmitting a first polarized wave and reflecting a second polarized wave,
a second mirror surface body for reflecting the second polarized wave reflected by the first mirror surface body, and
a polarization converting device for converting the second polarized wave reflected by the second mirror surface body into the first polarized wave,
wherein a polarized wave to be emitted is emitted aligned with the first polarized wave; and
a liquid crystal display panel for displaying an image by using light surface-emitted from the backlight apparatus.