Method and device for adjusting grayscale of display panel

A display device, comprising:

• a display panel;
• and
• the device for adjusting grayscale of display panel, wherein the device comprises:
• an image acquiring module, being configured to obtain a current image by acquiring image from the display panel;
• an identifying module, being configured to identify an nonuniform block in the current image, and detect original output brightness and original input grayscale of the nonuniform block;
• a computing module, being configured to determine a target input grayscale corresponding to a preset target brightness according to an actual Gamma curve value, wherein the actual Gamma curve value is obtained by testing the display panel;
• a first adjusting module, being configured to take a difference between the original input grayscale and the target input grayscale as a grayscale compensation value of the nonuniform block;
• an acquiring module, being configured to acquire a plurality of sampling grayscale voltages and a specific grayscale voltage in accordance with an actual Gamma curve when applying an initial common voltage to the common electrode;
• a second adjusting module, being configured to adjust the voltage applied to the common electrode, to acquire a common voltage by the acquiring module at which a flicker value of a display screen is minimized when the specific grayscale voltage is applied to the pixel electrode, and take the common voltage as an actual common voltage;
• a detecting module, being configured to determine a flicker value;
• and
• a third adjusting module, being configured to respectively adjust at least one of the acquired sampling grayscale voltages when the actual common voltage is applied to the common electrode, and determine a flicker value by detecting module of the corresponding display screen and taking the specific grayscale voltage corresponding to the minimum flicker value of the display screen as a Gamma reference voltage corresponding to the target input grayscale.

A method for adjusting grayscale of display panel, wherein the display panel is a liquid crystal display panel comprising a common electrode and a pixel electrode, the method comprises:

• obtaining a current image by acquiring image from the display panel;
• identifying a nonuniform block in the current image, and detecting original output brightness and original input grayscale of the nonuniform block;
• determining a target input grayscale corresponding to a preset target brightness according to an actual Gamma curve value, wherein the actual Gamma curve value is obtained by testing the display panel;
• taking a difference between the original input grayscale and the target input grayscale as a grayscale compensation value of the nonuniform block;
• applying an initial common voltage to the common electrode, and acquiring a plurality of sampling grayscale voltages and a specific grayscale voltage in accordance with an actual Gamma curve;
• adjusting the voltage applied to the common electrode, to acquire a common voltage at which a flicker value of a display screen is minimized when the specific grayscale voltage is applied to the pixel electrode, taking the common voltage as an actual common voltage;
• and
• respectively adjusting at least one of the acquired sampling grayscale voltages when the actual common voltage is applied to the common electrode, determining a flicker value of the corresponding display screen, and taking the specific grayscale voltage corresponding to the minimum flicker value of the display screen as a Gamma reference voltage corresponding to the target input grayscale.