Highly efficient 2d/3d switchable display apparatus

An image display apparatus comprising:

• a backlight unit where a reflection panel is installed at a bottom thereof;
• a polarization panel which transmits only light of a particular polarization direction of light emitted from the backlight unit;
• a polarization switch which changes the polarization direction of light incident upon the polarization switch;
• a reflective polarizer panel array which is formed by alternately arranging a first reflective polarizer panel that reflects light of a first polarization direction of light incident upon the first reflective polarizer panel and transmits light of a second polarization direction of light incident upon the first reflective polarizer panel and a second reflective polarizer panel that transmits light of a first polarization of light incident upon the second reflective polarizer panel and reflects light of a second polarization of light incident upon the second reflective polarizer panel;
• a birefringent element array which is formed by alternately arranging a plurality of first and second birefringent elements and changes polarization direction of light incident upon the plurality of first and second birefringent elements to make polarization directions of light passing through the first and second birefringent elements perpendicular to each other;
• a lens array which separates light incident upon the lens array into a first view zone and a second view zone;
• and
• a display panel displaying an image.