Conventional display devices often have the defect of display unevenness (e.g., sometimes referred to as “Mura” or “Trace Mura”) in a part of display regions, Mura is a poor display severely affecting the quality of the picture, the severity and duration of Mura are related to many factors, one is process parameter of the panel, such as liquid crystal, orientation layer, and the like, and the other is the setting of driving conditions. Experimental results show that white state voltage of the liquid crystal is reduced to effectively reduce the severity of the Mura and shorten its duration, wherein the white state voltage refers to the driving voltage of the display device corresponding to the maximal brightness.
The white state voltage of the liquid crystal is reduced to improve the Mura, but certain negative effects shall also be brought. As shown in FIG. 1, the transmittance shall be reduced due to the reduction of the white state voltage, namely, the maximal brightness is reduced, and meanwhile, the reduction of the maximal brightness means contrast reduction. With the reduction of the white state voltage, the variation of the driving voltage of each average grey scale is decreased, so that more accurate driving voltage of the display device is needed, which makes a driver integrated circuit (Driver IC) face more severe working conditions.
To sum up, in the prior art, the white state voltage of the liquid crystal is reduced to improve the Mura, but the maximal brightness shall be reduced, and meanwhile, the driver integrated circuit will face more severe working conditions.