Abstract: A touch projection screen including a substrate, touch layers, and a reflective projection film is provided. The touch layers and the reflective projection film are sequentially disposed on the substrate, and the touch layers are located between the substrate and the reflective projection film. Each of the touch layers comprises a base layer and an electrode pattern disposed on the base layer. Each electrode pattern includes a plurality of electrode line sets. Each electrode line set includes a plurality of electrode lines and a plurality of electrode segments. The electrode lines are arranged to be parallel to each other. An included angle between each of the electrode segments and one of the electrode lines is an acute angle. Two ends of each electrode segment are connected to the corresponding electrode lines. In addition, a touch projection system including the touch projection screen and a projection device is provided.

Abstract: A touch projection screen including a substrate, touch layers, and a reflective projection film is provided. The touch layers and the reflective projection film are sequentially disposed on the substrate, and the touch layers are located between the substrate and the reflective projection film. Each of the touch layers comprises a base layer and an electrode pattern disposed on the base layer. Each electrode pattern includes a plurality of electrode line sets. Each electrode line set includes a plurality of electrode lines and a plurality of electrode segments. The electrode lines are arranged to be parallel to each other. An included angle between each of the electrode segments and one of the electrode lines is an acute angle. Two ends of each electrode segment are connected to the corresponding electrode lines. In addition, a touch projection system including the touch projection screen and a projection device is provided.

Abstract: A light source device includes a first light-emitting element providing illumination beams, a light guide plate (LGP) divided into light-transmissive regions, an optical thin film, and microstructures. The LGP has a first surface, a second surface opposite to the first surface, and a first light-incident surface connecting the first and second surfaces. The first light-emitting element is beside the first light-incident surface. The illumination beams are capable of entering the LGP through the first light-incident surface. The optical thin film is on the second surface of the LGP. The optical thin film has different thicknesses corresponding to at least two of the light-transmissive regions. The microstructures are on the optical thin film. When the illumination beams pass through the light-transmissive regions corresponding to the different thicknesses of the optical thin film and leave the LGP through the first surface, the illumination beams are converted into color beams with different wavelengths.

Abstract: A light guide plate is adapted for guiding a light beam provided by a light emitting device. The light guide plate includes a light-transmissive substrate, a plurality of optical microstructures, and a plurality of diffusion particles. The light-transmissive substrate has a first surface, a second surface, and a light incident surface. The second surface is opposite to the first surface. The light incident surface connects the first surface and the second surface. The light beam is capable of entering the light-transmissive substrate through the light incident surface. The optical microstructures are disposed on the second surface. The diffusion particles are distributed in the light-transmissive substrate, and a haze value of the light guide plate is greater than or equal to 0.4% and smaller than or equal to 80%. A backlight module using the light guide plate is also provided.