A color filter substrate and a display device are disclosed. The color filter substrate includes a non-rectangular display region, which includes a peripheral display region including a black matrix and a plurality of first, second and third sub-pixels, and a non-display region. A sum of the ratios of the light-transmitting area respectively corresponding to the plurality of the first sub-pixels to areas of the same, a sum of the ratios of the light-transmitting area respectively corresponding to the plurality of the second sub-pixels to areas of the same, and a sum of the ratios of the light-transmitting area respectively corresponding to the plurality of the third sub-pixels to areas of the same are represented as P1, P2 and P3, the difference between the maximum and minimum values among P1, P2 and P3 is less than 0.3 times an average value of P1, P2 and P3.