Backplane and glass-based circuit board

A backplane, comprising:

• a base substrate;
• a plurality of light-emitting units, arranged in an array on the base substrate,
• wherein each of the plurality of the light-emitting units comprises at least one light-emitting sub-unit;
• the at least one light-emitting sub-unit comprises a connection line and a plurality of light-emitting diode chips electrically connected with the connection line;
• the plurality of the light-emitting diode chips are located on a side of the connection line away from the base substrate;
• in each of the light-emitting sub-units, the connection line comprises a first connection portion, a second connection portion and a third connection portion;
• in each of the light-emitting sub-units, the third connection portion comprises a plurality of connection sub-portions, each of the connection sub-portions comprise at least one electrical contact point;
• the electrical contact points at adjacent ends of adjacent connection sub-portions constitute an electrical contact point pair,
• wherein the plurality of the connection sub-portions comprise a first connection sub-portion and a second connection sub-portion, the first connection sub-portion comprises a rectangular central portion as well as a first edge portion and a second edge portion respectively located on both sides of a first central line of the rectangular central portion, and along an extension direction of the first connection sub-portion, sizes of the first edge portion and the second edge portion are both smaller than a size of the central portion,
• the first connection sub-portion extends along a first direction parallel to the base substrate;
• the first connection sub-portion comprises a connection region, an orthographic projection of a part of the first sub-portion where the connection region on the base substrate is located forms a shape of notch, and the electrical contact point of the first connection sub-portion is located on a side of the connection region facing the notch.