Unitarily white light-transmitting device and touch display

A unitarily white touch display, including:

• a cover lens, having an upper surface, a lower surface, and a viewing area formed in the middle of the cover lens;
• a touch module, disposed on the lower surface of the cover lens for providing touch functions;
• a light valve module, disposed under the touch module, including:
• a casing, filled with a polymer dispersed liquid crystal (PDLC) layer which is driven by an electric field to form a scattering mode and a transparent mode;
• a conductive film, disposed inside the casing and configured to be charged to generate the electric field;
• an air gap, located under the light valve module;
• a multilayer transflective optical film, disposed under the air gap, the multilayer transflective optical film including a plurality of birefringent films and optically isotropic films;
• a display module, disposed under the microstructure optical film to provide display functions;
• wherein, incident light passing through the light valve module, the air gap, then entering the multilayer transflective optical film, is partially reflected by the multilayer transflective optical film back to the light valve module through the air gap;
• and scattering of the incident light occurs in the air gap.

A unitarily white light-transmitting device, including:

• a light valve module, including:
• a casing, filled with a polymer dispersed liquid crystal (PDLC) layer which is driven by an electric field to form a scattering mode and a transparent mode;
• a conductive film, disposed inside the casing and configured to be charged to generate the electric field;
• an air gap, located under the light valve module;
• a multilayer transflective optical film, configured under the air gap, the multilayer transflective optical film including a plurality of birefringent films and optically isotropic films;
• wherein, incident light passing through the light valve module, the air gap, then entering the multilayer transflective optical film, is partially reflected by the multilayer transflective optical film back to the light valve module through the air gap;
• and scattering of the incident light occurs in the air gap.