Detection baseboard and control method thereof, detection device, and printing device

A method for controlling a detection baseboard, wherein the detection baseboard comprises:

• a substrate;
• a plurality of data lines extending in a first direction and a plurality of gate lines extending in a second direction located on the substrate, wherein the first direction intersects with the second direction:
• a plurality of sub-pixels arranged in an array, wherein the sub-pixels are located at positions defined by the data lines and the gate lines, and the sub-pixels are electrically connected to the data lines and the gate lines respectively;
• wherein each of the sub-pixels comprises a control unit and a charge distribution unit, the control unit is electrically connected to the data line and the gate line, the charge distribution unit comprises a first electrode and a charge transport layer, the first electrode is electrically connected to the control unit, and an orthographic projection of the charge transport layer on the substrate covers an orthographic projection of the first electrode on the substrate;
• the charge distribution unit is configured to discharge under control of the control unit.
• wherein the method comprises:
• charging the detection baseboard so that the charge distribution units are in a full charge state;
• inputting a first control signal to the control units of some of the sub-pixels, wherein the first control signal is configured to control the charge distribution unit of the sub-pixel to discharge so that a surface of the charge distribution unit is not carried with charges;
• and
• inputting a second control signal to the control units of some of the sub-pixels, wherein the second control signal is configured to control the charge distribution unit of the sub-pixel to hold charges;
• and
• obtaining the detection baseboard with a charge pattern.