Display panel, manufacture method therefor, and display device

A display panel comprising:

• a light emitting layer on a base substrate,
• a transparent spacing layer on the light emitting layer, and
• a wavelength converting layer on the transparent spacing layer,
• wherein the display panel comprises sub-pixels arranged in an array, the sub-pixels arranged in an array comprise a first sub-pixel and a second sub-pixel adjacent to each other, wherein in each of the first sub-pixel and the second sub-pixel, one light emitting unit in the light emitting layer and one wavelength converting unit in the wavelength converting layer are comprised, and the light emitting unit and the wavelength converting unit are stacked and spaced apart by the transparent spacing layer,
• the light emitting units of the first sub-pixel and the second sub-pixel are spaced apart by a first pixel defining layer in the light emitting layer, and have a top surface spacing of d2,
• the wavelength converting unit of the first sub-pixel is a first wavelength converting unit which has a luminance change ratio of ra on light emitted by the light emitting unit, and the wavelength converting unit of the second sub-pixel is a second wavelength converting unit which has a luminance change ratio of rb on light emitted by the light emitting unit, and the wavelength converting units of the first sub-pixel and the second sub-pixel are spaced apart by a second pixel defining layer in the wavelength converting layer,
• in a direction from the first sub-pixel to the second sub-pixel, relative to an orthographic projection of a boundary between a top surface of the light emitting unit of the second sub-pixel and the first pixel defining layer between the light emitting units of the first sub-pixel and the second sub-pixel on the base substrate, an orthographic projection of a boundary between a bottom surface of the second wavelength converting unit and the second pixel defining layer between the wavelength converting units of the first sub-pixel and the second sub-pixel on the base substrate is shifted by d42, wherein
• in all light which is incident into the transparent spacing layer from the top surface of the light emitting unit and may reach a top surface of the transparent spacing layer, light with an emergence angle of α1 or more has an intensity proportion of x1% or less, wherein x1% = p1 × (ra/rb), wherein p1 ≤ 5%,
• wherein when light starting from a bottom surface of the transparent spacing layer has an emergence angle of α1, a projection of a light path thereof through the transparent spacing layer on the base substrate has a length less than or equal to d2 + d42.