Patent ID: 11922090
Assignee: HYUNDAI IT CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G  H

Claim 2:
3. An automatic color calibration method of a video wall, the method performed by an automatic color calibration apparatus comprising a processor and signal line connection unit configured to be connected with the video wall having a plurality of video boards, wherein each video board of the plurality of video boards includes a display module and an illuminance sensor configured to sense an illuminance value of the display module, the method comprising:
storing a number of the plurality of video boards interconnected in a closed-loop daisy chain to constitute the video wall in a storage unit according to setting button signal; and
performing a backlight brightness control and a contrast value control such that the plurality of video boards have same backlight brightness values and same contrast values,
wherein performing the backlight brightness control includes:
sequentially receiving illuminance values from each of the plurality of video boards to store the received illuminance values in the storage unit, and determining, among the plurality of video boards, a video board having the lowest illuminance value; and
comparing the determined lowest illuminance value with the received illuminance values of the other video boards and outputting identification information on each video board and corresponding data to control backlight brightness to each video board of the plurality of video boards so that the backlight brightness of the other video boards match the determined lowest illuminance value of the video board; and

wherein performing the contrast value control includes:
sequentially receiving a plurality of WHITE brightness values from the plurality of video boards to store the received plurality of WHITE brightness value in the storage unit, and determining the identification information of the video board having the lowest WHITE brightness value among the received plurality of WHITE brightness values; and
calculating the differences between the determined lowest WHITE brightness value of the determined video board and the received WHITE brightness values of the other video boards among the plurality of video boards, and outputting the identification information on each video board and the corresponding data to control the contrast value to each video board of the plurality of video boards so that all of the plurality of video boards have a uniform contrast value.