Method and material for manufacturing alignment layer, display substrate, and display panel

A display substrate including an alignment layer with at least a portion of the alignment layer being formed from a composition, the composition including:

• a chiral material;
• polymerizable liquid crystal monomers;
• and
• an initiator for triggering a polymerization reaction in the polymerizable liquid crystal monomers,
• wherein the chiral material includes a CB15 derivative and the CB15 derivative has a molecular structure of
• with X, Y, and Z being H or F,
• wherein the polymerizable liquid crystal monomers include:
• only polymerizable cholesteric liquid crystal monomers, or a combination of the polymerizable cholesteric liquid crystal monomers and the polymerizable nematic liquid crystal polymerizable monomers,
• wherein
• the polymerizable liquid crystal monomers have a mass ratio of x in the composition, based on the total mass of the composition;
• the chiral material has a mass ratio of y in the composition, based on the total mass of the composition;
• the initiator has a mass ratio of about 0.03× to 0.05× in the composition;
• and
• the values of x and y satisfy a equation of Bx+y=1, with 1.03≦b≦1.05 and 0.02≦y≦0.15.

A method for manufacturing a display substrate, including:

• forming a first alignment layer on the substrate;
• coating a composition on the first alignment layer to form a second alignment layer, wherein the composition includes a chiral material, polymerizable liquid crystal monomers, and an initiator for triggering a polymerization reaction in the polymerizable liquid crystal monomers;
• and
• forming one or more alignment orientation by using one or more masks and one or more UV illuminations for exposing the second alignment layer, wherein the one or more masks includes alternating light-transmitting regions and opaque regions,
• wherein the chiral material includes a CB15 derivative and the CB15 derivative has a molecular structure of
• with X, Y, and Z being H or F,
• wherein the polymerizable liquid crystal monomers include:
• only polymerizable cholesteric liquid crystal monomers, or a combination of the polymerizable cholesteric liquid crystal monomers and the polymerizable nematic liquid crystal polymerizable monomers,
• wherein:
• the polymerizable liquid crystal monomers have a mass ratio of x in the composition, based on the total mass of the composition;
• the chiral material has a mass ratio of y in the composition, based on the total mass of the composition;
• the initiator has a mass ratio of about 0.03× to 0.05× in the composition;
• and
• the values of x and y satisfy a equation of Bx+y=1, with 1.03≦b≦1.05 and 0.02≦y≦0.15.