Abstract: The present invention provides a backlight for dual-view display, comprising: a light source; a light-guide plate, which allows the incoming of light from the light source and uniformly guides and diffuses the light; a diffusing sheet, which is placed between the light-guide plate and liquid crystal panel; two prism sheets, which are placed between the diffusing sheet and the liquid crystal panel; and a reflective sheet, wherein the face where the prism is formed on the prism sheet on the diffusing sheet side amongst the two prism sheets faces the diffusing sheet, and the prism axis (the ridge line of the prism) is placed as to be parallel to a longitudinal direction with respect to the liquid crystal screen; the face where the prism is formed on the prism sheet on the liquid crystal panel side faces the liquid crystal panel, and the prism axis (the ridge line of the prism) is placed as to be the same as the lateral directions with respect to the liquid crystal screen; the prism tip angle of the prism sheet o

Abstract: The present invention provides a backlight for dual-view display, comprising: a light source; a light-guide plate, which allows the incoming of light from the light source and uniformly guides and diffuses the light; a diffusing sheet, which is placed between the light-guide plate and liquid crystal panel; two prism sheets, which are placed between the diffusing sheet and the liquid crystal panel; and a reflective sheet, wherein the face where the prism is formed on the prism sheet on the diffusing sheet side amongst the two prism sheets faces the diffusing sheet, and the prism axis (the ridge line of the prism) is placed as to be parallel to a longitudinal direction with respect to the liquid crystal screen; the face where the prism is formed on the prism sheet on the liquid crystal panel side faces the liquid crystal panel, and the prism axis (the ridge line of the prism) is placed as to be the same as the lateral directions with respect to the liquid crystal screen; the prism tip angle of the prism sheet o

Abstract: The color gamut of a image display device is improved by the introduction of a broad band stop filter in combination with a band pass filter, a first light field and a second light field. The first light field is generated by a first and a second light source, emitting blue and green light, respectively. The second light field is generated by said second light source and a third light source emitting red light. The color gamut is improved since the band pass filter facilitates a displacement of the color point of said second light source towards shorter wavelengths, as the band pass filter transmits some of the blue light in the first light field. Similarly, a displacement towards longer wavelengths is facilitated, as the filter transmits some of the red light of said second light field. Hence, four primary colors are generated by only three light sources.

Abstract: An object of the invention is to provide a pixel electrode and a liquid crystal display device using it, which can reduce improper reflected light. A pixel electrode 1 for applying a voltage for each pixel. This pixel electrode comprises: a reflective area portion 1r reflecting a light ray from a display screen side in such a manner that the light ray is along a predetermined bidirectional optical path within a pixel; a transmissive area portion 1t transmitting a light ray from a rear side to the display screen side in such a manner that the light ray is along a predetermined unidirectional optical path within the pixel; and a transition area portion 1TR being formed between the reflective area portion 1r and the transmissive area portion 1t and including a portion 4c in which the reflective area portion 1r and the transmissive area portion 1t are coupled. The transition area portion 1TR is extended with an at least partly rounded shape on a plan view.

Abstract: An object of the invention is to provide a pixel electrode and a liquid crystal display device using it, which can reduce improper reflected light. A pixel electrode 1 for applying a voltage for each pixel. This pixel electrode comprises: a reflective area portion 1r reflecting a light ray from a display screen side in such a manner that the light ray is along a predetermined bidirectional optical path within a pixel; a transmissive area portion 1t transmitting a light ray from a rear side to the display screen side in such a manner that the light ray is along a predetermined unidirectional optical path within the pixel; and a transition area portion 1TR being formed between the reflective area portion 1r and the transmissive area portion 1t and including a portion 4c in which the reflective area portion 1r and the transmissive area portion 1t are coupled. The transition area portion 1TR is extended with an at least partly rounded shape on a plan view.

Abstract: To increase an amount of the light that can be used for the display efficiently in the total amount of the emitted light in the liquid crystal display device having the surface lighting device such as the front-light. The light (a) becomes the light component of the linearly polarized light by passing the retardation plate (11a). In the reflective polarizer (11b), only the light (b) that is a component of the polarization axis of the reflective polarizer (11b) passes through the reflective polarizer (11b) to enter into the end portion of the light guide (12). The light that is a component other than the component of the polarization axis of the reflective polarizer (11b) is reflected on the reflective polarizer (11b). The light reflected on the reflective polarizer (11b) changes from the linearly polarized light to the circularly polarized light by passing through the retardation plate (11a).

Abstract: An object of the invention is to provide a surface illumination device and a display device using it, which can contribute to improvement of display qualities. A surface illumination device 10 comprising a light guide plate 1 for propagating incident light inside itself and reflecting the light at the reflecting prism face 1S to output the light from the light exit face. This further comprises: a polarizing plate 3 provided on the light exit face; and an anti-reflection film 4 provided on the polarizing plate 3. The reflecting prism face 1S extends so that a direction of electric vector's vibration of an s-polarized light component of a reflecting light ray caused by an incident light ray in a predetermined propagation direction is in parallel with a polarization axis of the polarizing plate 3, whereby a light efficiency can be improved.

Abstract: An object of the invention is to provide a pixel electrode and a liquid crystal display device using it, which can reduce improper reflected light. A pixel electrode 1 for applying a voltage for each pixel. This pixel electrode comprises: a reflective area portion 1r reflecting a light ray from a display screen side in such a manner that the light ray is along a predetermined bidirectional optical path within a pixel; a transmissive area portion 1t transmitting a light ray from a rear side to the display screen side in such a manner that the light ray is along a predetermined unidirectional optical path within the pixel; and a transition area portion 1TR being formed between the reflective area portion 1r and the transmissive area portion 1t and including a portion 4c in which the reflective area portion 1r and the transmissive area portion 1t are coupled. The transition area portion 1TR is extended with an at least partly rounded shape on a plan view.