Optical diffusers are key components in liquid crystal displays (LCDs). Diffusers with wide angles, high transmittance, and great uniformity have always been an important research goal in the LCD field. Based on the Helmholtz-Kirchhoff theory, the spectral distribution of speckle intensity for laser passing through a rough surface is derived. A design method for holographic diffusers is proposed, which is based on the superposition exposure of scattering fields formed by multiple beams at specific incident angles irradiating a rough surface in turn. This method broadens the scattering angle of holographic diffusers and improves the uniformity of scattering intensity. The fabrication path to holographic diffusers is made and holographic diffusers are fabricated by the proposed method. The far-field intensity distribution measured by this method is in good agreement with the simulation results. The full width at half maximum (FWHM) of scattering angles reaches 130°; the light transmittance is more than 90%, and the diffusion coefficient is as high as 92%. In addition, wide angles, high transmittance, and great brightness uniformity are realized. This method has potential application prospects in LCDs.