Due to the limitation of manufacturing technology, the sub-pixels of RGB-Delta structure active-matrix organic light emitting diode (AMOLED) are arranged irregularly, the trichrome sub-pixels are distributed as triangle, and each pixel unit is composed of two sub-pixels, so the RGB image cannot be displayed normally. In order to solve this problem, by analyzing the arrangement characteristics of sub-pixels in RGB-Delta structure AMOLED, this paper proposes the sharing principle and method of the sub-pixels in rendering unit, and calculates the gray-scale difference between a sub-pixel and a shared sub-pixel in the original image. A method based on threshold comparison is proposed to calculate the optimal rendering weight coefficient, and the virtual pixel grayscale value is obtained by summing the pixel gray-scale value weights of the original image. Random image tests show that the mean square error of the processed image and original image is 4.68×10 ^-5, and the mean peak signal-to-noise ratio is 40.45 dB. At the same time, the algorithm is verified by point screen display, including high-frequency images such as text and line. The proposed algorithm can restore the image information without distortion and effectively control the color edge influence.