Electronically controlled light valve and display apparatus having high transmittance and high reflectivity

A display apparatus, comprising:

• a display panel, adapted to emit a display light beam;
• and
• an electrically controlled light valve, disposed on a transmission path of the display light beam, adapted to be switched to a reflection mode or a light-transmission mode and comprising:
• a first substrate;
• a second substrate, disposed opposite to the first substrate;
• a first transparent conductive layer, disposed on the first substrate;
• a second transparent conductive layer, disposed on the second substrate;
• a first liquid layer, disposed between the first transparent conductive layer and the second transparent conductive layer and adjacent to the first transparent conductive layer, wherein the first liquid layer comprises a polar liquid, water, and sodium chloride (NaCl) mixed in the water;
• a second liquid layer, disposed between the first transparent conductive layer and the second transparent conductive layer and adjacent to the second transparent conductive layer, wherein the second liquid layer comprises a non-polar liquid;
• and
• a plurality of reflective particles, each of the reflective particles having a conductive body and a surface modification layer, wherein the surface modification layer has a uniform property throughout the surface modification layer and the conductive body is at least partially surrounded by the surface modification layer,
• wherein when the electrically controlled light valve is switched to the light-transmission mode, the reflective particles are evenly dispersed in the first liquid layer, and
• when the electrically controlled light valve is switched to the reflection mode, the reflective particles are accumulated on an interface between the first liquid layer and the second liquid layer.