Optical element, liquid crystal panel, and liquid crystal display
View Patent ↗A liquid-crystal display that can inhibit the coloring of an image when a liquid-crystal panel is viewed from an oblique direction is provided. An optical filter is disposed at the forward end of a liquid-crystal panel and has different transmittances between a light component that travels in an oblique direction and a light component that travels in a direction normal to the multilayer, where both of the light components have a predetermined wavelength range. In the case where a wide-color-gamut light source, such as LEDs, is used as a light sources of a backlight unit, when the liquid-crystal panel is viewed from an oblique direction, the entire image area tends to be reddish, and the color temperature tends to decrease. In this case, the optical filter is configured such that the intensity of a visible red light component is selectively reduced such that the intensity of a visible blue light component is increased, thereby inhibiting the reddening of an image area when viewed from an oblique direction.
1. A liquid-crystal display comprising:
a liquid-crystal panel;
a backlight unit disposed at the back side of the liquid-crystal panel, wherein the backlight unit includes a light source having a NTSC ratio of 90% or more; and
an optical element comprising a dielectric multilayer including a first refractive-index material layer and a second-refractive-index material layer having a refractive index different from the refractive index of the first-refractive-index material layer, which are alternately stacked on a transparent support made of a transparent plastic film, and having different transmittances between a light component that travels in an oblique direction and a light component that emerges from the liquid-crystal panel toward the front, both of the light components being emitted from the backlight unit and having a predetermined wavelength range, wherein each of the light components having the predetermined wavelength range is a visible light component having a wavelength of 600 nm or more, and the liquid-crystal display has a transmittance for the visible light component that travels in an oblique direction lower than the transmittance for the visible light component that emerges from the outgoing-light-side face toward the front wherein the optical element has an average transmittance for a visible light component incident on the optical element at an angle of incidence ranging from 10° to 30° and having a wavelength between 400 nm to 450 nm higher than the average transmittance for a visible light component incident on the optical element at an angle of incidence of incidence of 0° and having a wavelength between 400 nm to 450 nm.
2. The liquid-crystal display of claim 1 , wherein the optical element has
an average transmittance for a visible light component having a wavelength between 600 nm and 650 nm lower than the average transmittance for a visible light component having a wavelength of less than 600 nm, both of the visible light components being incident on the optical element at an angle of incidence of 60°.