The embodiments of the present invention provide an array substrate and a display device, relate to the field of electronic technology and reduce the problem of color shift occurred in the display device to a certain degree. The solution comprises: a first pixel unit corresponds to a red color resist, the first pixel unit comprising a first TFT channel formed between the source and the drain of a first TFT; a second pixel unit corresponds to a green color resist, the second pixel unit comprising a second TFT channel formed between the source and the drain of a second TFT; a third pixel unit corresponds to a blue color resist, the third pixel unit comprising a third TFT channel formed between the source and the drain of a third TFT; and a ratio of width to length of the third TFT channel is greater than that of the second TFT channel; or, the ratio of width to length of the third TFT is channel is greater than that of the first TFT channel. This solution is applied to array substrates and display devices.