The invention discloses an OLED display apparatus. A blue-light upper conversion light emitting material is doped in a flattening layer; based on the property that the absorption wavelength of the blue-light upper conversion light emitting material is longer than the long wavelength of the blue light wavelength, and short-wavelength blue light can be excited, the color cast condition of a white light OLED device caused by short service life of a blue electroluminescent material is effectively relieved; the blue light compensation of the white light OLED device is realized; the problem of high probability of yellow color cast of the conventional OLED display apparatus is solved; and the OLED display apparatus has good display quality.