Display device with automatic brightness adjustment mechanism and automatic brightness adjustment method for display panel thereof

A display device with an automatic brightness adjustment mechanism, comprising:

• a display panel operating in a current brightness range among a plurality of brightness ranges and having a current brightness value;
• a light sensing device configured to sense an ambient light brightness value of an environment in which the display panel is located;
• and
• a processing unit coupled to the light sensing device and the display panel and configured to:
• receive the ambient light brightness value from the light sensing device;
• and
• determine whether the ambient light brightness value exceeds the current brightness range of the display panel, and in response to the ambient light brightness value exceeding the current brightness range, the processing unit is further configured to:
• determine whether a duration for which the ambient light brightness value exceeds the current brightness range reaches a predetermined duration, and in response to the duration reaching the predetermined duration, the processing unit is further configured to:
• convert the ambient light brightness value into a target brightness value of the display panel;
• adjust the current brightness value of the display panel to the target brightness value at a predetermined rate;
• and
• adjust the current brightness range to a target brightness range according to the target brightness value, and monitor the ambient light brightness value of the environment where the display panel is located based on the target brightness range.