Adjustable support frame for a display screen

An adjustable support frame for supporting a display screen on a supporting surface, the display screen having a screen back and a screen bottom, said support frame comprising:

• a frame base adapted to be disposed on the supporting surface;
• a bottom-supporting strut unit having a lower end connected fixedly to said frame base, and an upper end adapted to be connected pivotally to the screen bottom;
• a back-supporting strut unit including a connecting member and a supporting member, the supporting member having a lower end connected pivotally to said frame base, and an upper end connected pivotally to said connecting member;
• and
• an adjusting unit including
• a mounting plate adapted to be attached fixedly to the screen back and having a slide slot, said connecting member being movable along said slide slot,
• a first engaging member disposed fixedly on said mounting plate,
• a second engaging member disposed movably on said mounting plate,
• a driving member disposed movably on said mounting plate and movable on said mounting plate between a locking position and a release position, wherein said second engaging member engages said first engaging member to lock said connecting member on said mounting plate and angle adjustment of the display screen is prevented when said driving member is disposed at the locking position, and said second engaging member is removed from said first engaging member to release said connecting member from said mounting plate and angle adjustment of the display screen is allowed when said driving member is disposed at the release position, and
• a biasing unit for biasing said driving member to said locking position.