A cover plate structure includes a first light transmitting layer, a second light transmitting layer, and a light shielding layer. The first light transmitting layer includes a top surface and a bottom surface opposite the top surface. The second light transmitting layer is on the top surface of the first light transmitting layer. A refractive index of the first light transmitting layer is greater than a refractive index of the second light transmitting layer. The light shielding layer is on the bottom surface of the first light transmitting layer.