Projection screen, vehicle-mounted head-up display and display adjustment method

A projection screen (100) comprising:

• a transflector (1) having a front surface that reflects projected light;
• and
• a display adjustment assembly (2) provided on a rear surface side of the transflector (1) and configured to adjust transparency;
• wherein the display adjustment assembly (2) comprises at least one of an electrochromic member (21) and an electrically controlled dimming member (22);
• wherein the electrochromic member (21) comprises at least one electrode layer (212), and an electrochromic material layer (211) which are layered;
• wherein the electrically controlled dimming member (22) comprises an electrically controlled dimming material layer (221) and at least one electrode layer (222) which are layered;
• wherein the electrochromic material layer (211) of the electrochromic member (21) is configured to switch between a faded state and a colored state, based on a voltage applied to the at least one electrode layer (212) of the electrochromic member (21);
• and
• wherein the electrically controlled dimming material layer (221) of the electrically controlled dimming member (22) is configured to switch between a transparent state and a foggy state, based on a voltage applied to the at least one electrode layer (222) of the electrically controlled dimming member (22).