CPC G02B 6/0093 (2013.01) [G02B 6/0065 (2013.01); G02F 1/133357 (2021.01); G02F 1/133368 (2021.01); G02F 1/133512 (2013.01); G02F 1/133524 (2013.01); G02F 1/133615 (2013.01); G02F 1/136209 (2013.01); G02F 2201/07 (2013.01); G02F 2201/30 (2013.01); G02F 2201/50 (2013.01)] | 15 Claims |
1. A display panel, comprising:
a light guide plate;
an array substrate opposite to the light guide plate;
a liquid crystal layer located between the light guide plate and the array substrate;
a plurality of light extraction gratings located on a side of a light-emitting surface of the light guide plate;
a transparent protective layer located between a film layer where the light extraction gratings are located and the light guide plate;
wherein the light guide plate comprises a plurality of light extraction port regions, and transparent regions beside the light extraction port regions;
each of the light extraction port regions is provided with one of the light extraction gratings, the light extraction gratings are configured to take out light in the light guide plate; the transparent regions are configured to transmit light in the light guide plate by total reflection;
the protective layer is at least arranged in the transparent region; and
the protective layer is an etching barrier layer, and the etching barrier layer has an etching selection ratio greater than an etching selection ratio of the light extraction gratings, and the display panel further comprises a planarization layer covering each of the light extraction gratings and regions outside the light extraction gratings, the planarization layer is a resin layer, the protective layer has a refractive index greater than a refractive index of the light guide plate, and the planarization layer has a refractive index less than the refractive index of the light guide plate; or
the protective layer is a resin layer, and the display panel further comprises a planarization layer covering each of the light extraction gratings and regions outside the light extraction gratings, the planarization layer has a refractive index less than a refractive index of the light guide plate, and the protective layer has a refractive index same as the refractive index of the planarization layer.
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