Reflective display device

A reflective display device, capable of reflecting an external light, wherein the external light comprises:

• a first color light, having a first polarization state;
• a second color light, having a second polarization state, wherein the first color light and the second color light are a blue light apiece;
• a third color light, having a third polarization state;
• a fourth color light, having a fourth polarization state, wherein the third color light and the fourth color light are a green light apiece;
• a fifth color light, having a fifth polarization state;
• a sixth color light, having a sixth polarization state, wherein the fifth color light and the sixth color light are a red light apiece,
• wherein the reflective display device comprises:
• a first display assembly, comprising:
• two first cholesteric liquid crystal modules, capable of reflecting the first color light, wherein the third color light and the fourth color light pass through the first display assembly;
• a first optical layer, disposed between the two first cholesteric liquid crystal modules, and capable of converting the second color light passing through one of the two first cholesteric liquid crystal modules to the first color light having the first polarization state, so that the other one of the two first cholesteric liquid crystal modules reflects the first color light from the first optical layer;
• a second display assembly, disposed under the first display assembly and comprising:
• two second cholesteric liquid crystal modules, capable of reflecting the third color light, wherein the third color light and the fourth color light both from the first display assembly enter the second display assembly, while the fifth color light and the sixth color light pass through the first display assembly and the second display assembly;
• a second optical layer, disposed between the two second cholesteric liquid crystal modules, and capable of converting the fourth color light passing through one of the two second cholesteric liquid crystal modules to the third color light having the third polarization state, so that the other one of the two second cholesteric liquid crystal modules reflects the third color light from the second optical layer;
• a third display assembly, disposed under the second display assembly, wherein the second display assembly is located between the first display assembly and the third display assembly, while the fifth color light and the sixth color light from the second display assembly enter the third display assembly, wherein the third display assembly comprises:
• two third cholesteric liquid crystal modules, capable of reflecting the fifth color light;
• and
• a third optical layer, disposed between the two third cholesteric liquid crystal modules, and converting the sixth color light passing through one of the two third cholesteric liquid crystal modules to the fifth color light having the fifth polarization state, so that the other one of the two third cholesteric liquid crystal modules reflects the fifth color light from the third optical layer.