An exemplary liquid crystal display (LCD) panel includes scan lines, data lines, a scan driver connected to the scan lines, a data driver connected to the data lines, a controller connected to the scan driver and the data driver, and pixels formed by the scan lines and the data lines. The LCD panel is divided into five detecting regions, and the first detecting region is in a center of the LCD panel, and others surround the center portion of the LCD panel. Each detecting region includes a photo sensor. The controller is used to control the five detecting regions to have substantially the same flicker level.