Color filter substrate, preparing method thereof, and display device

A color filter substrate comprising:

• a substrate, a black matrix pattern, a color filter pattern, a planarization layer, a primary spacer and a secondary spacer, wherein
• the black matrix pattern and the color filter pattern are disposed on the substrate,
• the color filter pattern comprises a plurality of color filter elements, a size of each color filter element, measured in a column direction of the color filter pattern, is larger than a size of the color filter element measure in a row direction,
• the black matrix pattern comprises a primary area and a secondary area, the primary area is disposed between two color filter elements which are substantially aligned along the column direction, the secondary area is disposed between another two color filter elements which are substantially aligned along the column direction, a width of the primary area in the column direction is greater than a width of the secondary area in the column direction,
• the planarization layer is disposed at a side, of the color filter pattern and the black matrix pattern, that is opposite to the substrate, and
• the primary spacer and the secondary spacer are disposed at a side, of the planarization layer, that is opposite to the substrate, the primary spacer is disposed on the primary area of the black matrix pattern, the secondary spacer is disposed on the secondary area of the black matrix pattern, and the primary spacer has a height greater than that of the secondary spacer.