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To solve the problems of traditional integral imaging, such as poor visual quality, the ray-crosstalk in display, and grainy obvious, a display method based on discrete glued lens array and holographic diffuser is proposed. The proposed method replaces the continuous single lens array in the traditional display method of integral imaging with a discrete glued lens array and a holographic diffuser. In this paper, the structure and imaging quality of single lens and glued lens are designed, analyzed and compared. And the diffusion effect of the holographic diffuser is theoretically analyzed. We have designed two display system based on the ultra-high-density small-pitch LED display plane. The experimental results show that the visual quality of the proposed method is significantly improved compared with the traditional integral imaging display method. Compared with the traditional integral imaging display method based on a continuous single lens array, the proposed method can effectively reduce the influence of ray-crosstalk on the 3D images, smooth the discontinuous light field distribution, and reduce graininess to improve visual quality. In addition, since the traditional continuous single lens array needs to manufacture an abrasive tool with the same size as the display platform during processing, and the discrete glued lens array only needs to process the unit lens and then assemble them. If a large-scale integral imaging display system is to be manufactured, discrete lens array is more suitable, because the discrete glued lens array is cheaper and easier to be manufactured. In order to meet the experimental expectations and improve the display visual quality, we used a glued lens array in the experiment. Compared with aspheric lens that is difficult to process, the glued lens is easier to design and process and has good display visual quality.
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