Abstract: A projection screen of a head-up display has a projection surface and a back surface opposite to the projection surface. The projection surface is used for receiving an image beam projected by an image projection component and reflecting part of the image beam. The projection screen includes a photochromic layer disposed on the transmission path of the image beam. When an ambient light irradiates the back surface of the projection screen, the transmittance of the photochromic layer decreases as the intensity of the ambient light increases.

Abstract: An optical film includes a plane and a plurality of dents. The plane has a normal, and the dents are formed on the plane. Each of the dents is asymmetric relative to the normal, wherein each of the dents includes an opening, and the maximum aperture of each of the dents is the caliber of the opening.

Abstract: A light guide film includes at least one wedge-shaped light incident portion and a light exit sheet. The wedge-shaped light incident portion has a light incident side surface and a connection side opposite to the light incident side surface. A thickness at the light incident side surface of the wedge-shaped light incident portion is greater than a thickness at the connection side of the wedge-shaped light incident portion. The light exit sheet is connected to the connection side and extends from the connection side. The light exit sheet has a light exit surface. The wedge-shaped light incident portion protrudes from the light exit surface. The light incident side surface is for receiving a light. The light is emitted from the light exit surface. The light exit sheet and the wedge-shaped light incident portions are integrally formed into one.

Abstract: A projection screen of a head-up display has a projection surface and a back surface opposite to the projection surface. The projection surface is used for receiving an image beam projected by an image projection component and reflecting part of the image beam. The projection screen includes a photochromic layer disposed on the transmission path of the image beam. When an ambient light irradiates the back surface of the projection screen, the transmittance of the photochromic layer decreases as the intensity of the ambient light increases.

Abstract: An optical film includes a plane and a plurality of dents. The plane has a normal, and the dents are formed on the plane. Each of the dents is asymmetric relative to the normal, wherein each of the dents includes an opening, and the maximum aperture of each of the dents is the caliber of the opening.

Abstract: A flexible touch panel includes a display unit, a touch sensing unit and a protective layer. The touch sensing unit is bounded to the display unit, and includes two touch control circuit layers and a waveplate. The waveplate is disposed between two touch control circuit layers, and includes a first plane and a second plane opposite to the first plane. One of the touch control circuit layers is formed on the first plane. The protective layer is bounded to the touch sensing unit, and the touch sensing unit is disposed between the display unit and the protective layer.

Abstract: A limiting viewing angle sheet comprises a substrate, a transparent layer and an opaque pattern. The transparent layer is disposed on the substrate, and comprises a top plane and a plurality of grooves formed on the top plane, wherein the width of each of the grooves is decreased from the top plane to the substrate. The opaque pattern is formed within the grooves, and comprises a top surface and a plurality of side planes, wherein the transparent layer is exposed from the top surface, and the side planes extend from the top surface. The opaque pattern comprised different included angels respectively between the top surface and two of the side planes.