Display module, display device and viewing-angle switching method

A display module, comprising:

• a backlight module, a display panel, a lower polarizer sheet, a viewing-angle switching element and a transparent cover plate, wherein the viewing-angle switching element and the transparent cover plate are arranged between the display panel and the lower polarizer sheet, and the transparent cover plate is arranged on a side of the viewing-angle switching element that is close to the lower polarizer sheet;
• the backlight module is configured to supply light that meets a preset condition, the viewing-angle switching element is configured to switch viewing-angle modes of the display module;
• the viewing-angle modes comprise:
• a first viewing-angle mode and a second viewing-angle mode;
• and a viewing-angle range of the first viewing-angle mode is smaller than a viewing-angle range of the second viewing-angle mode,
• the viewing-angle switching element comprises:
• a first transparent electrode, a second transparent electrode, and a viewing-angle switching layer;
• the viewing-angle switching layer is located between the first transparent electrode and the second transparent electrode;
• the first transparent electrode is located on a side of the viewing-angle switching layer that is close to the display panel;
• and the first transparent electrode and the second transparent electrode are configured to apply an electric field to the viewing-angle switching layer to change a state of the viewing-angle switching element;
• wherein the display module further comprises:
• a flexible circuit board, a first conducting wire, a second conducting wire, a third conducting wire, and a fourth conducting wire;
• the first conducting wire and the second conducting wire are arranged on a side of the display panel that is close to the viewing-angle switching element, and are respectively connected with the flexible circuit board;
• the third conducting wire connects the first conducting wire and the first transparent electrode;
• and the fourth conducting wire connects the second conducting wire and the second transparent electrode,
• the first conducting wire and the second conducting wire are further respectively arranged on two side surfaces of the display panel which are opposite to each other, and the second conducting wire is electrically connected with the flexible circuit board by wiring in the display panel.