Reduction of intensity ringing in fluorescent displays

摘要

Embodiments of fluorescent display screens having an intermediate layer between a light-emitting fluorescent layer and an excitation filter layer are disclosed. The intermediate layer includes (1) a low-index layer disposed between the light-emitting fluorescent layer and the excitation filter layer and (2) an index bridging layer disposed between the low-index layer and the excitation filter layer. The insertion of the low-index layer and the index bridging layer according to the above configuration reduces the sensitivity of the excitation coupling to the non-uniformities in the excitation filter layer and variability in the output frequency of the excitation source, leading to improved uniformity of display intensity without significant compromise in the excitation coupling efficiency. A index bridging region made of a hard coat also provides abrasion resistance and provides structure rigidity to the adjacent excitation filter layer.

主权项

1. A display screen, comprising:
a light-emitting layer configured to emit visible light in a first wavelength range under irradiation of excitation light in a second wavelength range distinct from the first wavelength range, the light-emitting layer having a first side facing a viewer side of the display screen, and a second side facing an excitation side of the display screen; an excitation filter layer disposed on the excitation side of display screen relative to the light-emitting layer, and configured to selectively reflect the visible light in the first wavelength range and transmit the excitation light in the second wavelength range; and an intermediate layer disposed between and adjacent to the light-emitting layer and the excitation filter layer, wherein the intermediate layer comprises one or more first regions in contact with the light-emitting layer, and a second region separating the one or more first regions from the excitation filter layer, and wherein the second region has a bridging refractive index between a first refractive index of the one or more first regions and a second refractive index of the excitation filter layer.