Liquid crystal display apparatus with brightness/luminance holding ratio compensation and a driving method thereof

摘要

The invention discloses a liquid crystal display (LCD) apparatus and a brightness/luminance holding ratio compensation method. A backlight module of the LCD apparatus may form a plurality of backlight shield-blocking periods in a display frame cycle or adjust output brightness gradually, for compensating a brightness/luminance bias caused by a transmittance variance of liquid crystal cell in the low refresh rate driving LCD apparatus, so as to avoid some abnormal display effects, such as screen flicker. Besides, the LCD apparatus has better energy efficiency by utilizing a low-voltage gray level driving method or saving the power consumption of the backlight module.

主权项

1. A liquid crystal display apparatus with brightness/luminance holding ratio compensation, comprising:
a liquid crystal display panel having a refresh rate, wherein a transmittance or brightness/luminance of the liquid crystal display panel changes over time in a display frame cycle; a driving circuit for driving the liquid crystal display panel according to a driving voltage; and a register, for catching an image information; a backlight module comprising:
a backlight source;a backlight driving circuit for driving the backlight source;a controller, coupled to the register, the driving circuit and the backlight driving circuit, wherein the controller comprises a calculation determiner, for capturing the image information of the register and analyzing the image information; the controller is configured to supply a control signal to the backlight driving circuit based on the image information; anda backlight control circuit for forming a plurality of backlight shield-blocking periods in the display frame cycle and controlling the backlight driving circuit to temporarily turn off or turn dark the backlight source or temporarily turn down the backlight source to a dark state in the backlight shield-blocking periods, the display frame cycle is divided into a plurality of cycle intervals, the whole display frame cycle corresponds to one fixed gray level, and the backlight control circuit forms at least one backlight shield-blocking period in each cycle interval, a shield-blocking persistent length of the backlight shield-blocking periods sequentially increases when the liquid crystal display panel is a normally white mode liquid crystal display panel and the driving voltage is attenuated;wherein when the driving voltage is attenuated, the transmittance of the of the liquid crystal display panel increases over time.