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

Claim 0:
1. An automatic color calibration apparatus of a video wall comprising:
a signal line connection unit configured to transmit and receive data signals to and from a computer and a video wall including a plurality of video boards interconnected in a closed-loop daisy chain, 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;
a display unit;
a user input unit including a plurality of user setting buttons; and
a control unit configured to output a number of the plurality of video boards constituting the video wall to the display unit and store the number in a storage unit according to operation signals from the user input unit, and perform automatic color calibration for the plurality of video boards,
wherein the control unit comprises a processor configured to perform 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 the backlight brightness control includes:
sequentially receiving illuminance values from the plurality of video boards through the signal line connection unit,
storing the received illuminance values in the storage unit,
determining, among the plurality of video boards, a video board having the lowest illuminance value,
comparing the determined lowest illuminance value with the received illuminance values, 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 through the signal line connection unit so that the backlight brightness of the other video boards match the determined lowest illuminance value of the video board, and wherein the contrast value control includes:
sequentially receiving a plurality of WHITE brightness values from the plurality of video boards,
storing the received plurality of WHITE brightness values in the storage unit,
determining the identification information of the video board having the lowest WHITE brightness value among the received plurality of WHITE brightness values,
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 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.