Two-layered optical plate including skewed micro-depression matrix

An optical plate, comprising:

• a transparent layer including a light input interface, a light output surface opposite to the light input interface, and a plurality of micro-depressions formed on the light output surface and arranged in a skewed matrix, wherein the skewed matrix comprises rows and columns, the rows and columns extending along curved imaginary lines in a plane parallel to the light output surface, respectively, and each micro-depression has a shape that follows a contour of the skewed matrix, the micro-depressions have different shapes;
• and
• a light diffusion layer integrally formed in immediate contact with the light input interface of the transparent layer, and free of air or gas pockets trapped in an interface therebetween, the light diffusion layer including a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin, wherein each micro-depression has at least three side surfaces connected to each other, and a transverse width of each side surface increases along a direction away from the light diffusion layer.