Liquid crystal display device with switchable viewing angle and viewing angle switching method

A viewing angle switching method for a liquid crystal display device, the liquid crystal display device comprising a display panel, the display panel comprising a first substrate, a second substrate disposed opposite to the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate, the first substrate being provided with a viewing angle control electrode, the second substrate being provided with a common electrode and pixel electrodes, the display panel being switchable between a wide viewing angle mode and a narrow viewing angle mode, wherein the liquid crystal display device further comprises a display control module and a voltage output module, the viewing angle switching method comprises:

• the display control module receiving a viewing angle switching signal issued by the user, and determining whether the display panel switches to the wide viewing angle mode or the narrow viewing angle mode according to the viewing angle switching signal;
• when the display panel is switched to the wide viewing angle mode, the display control module controls the image refresh frequency of the display panel to be the same as the data input frequency of the image data inputted to the display control module, and controls the voltage output module to output a direct current voltage to the viewing angle control electrode;
• when the display panel is switched to the narrow viewing angle mode, the display control module controls the image refresh frequency of the display panel to be converted to twice or four times the data input frequency of the image data inputted to the display control module, and controls the voltage output module to output a periodic alternating voltage to the viewing angle control electrode.