Patent ID: 11953680
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A see-through display device, comprising a light guide plate and an array substrate which are oppositely arranged, and a liquid crystal dimming layer arranged between the light guide plate and the array substrate, wherein the see-through display device further comprises:
a collimated light source assembly, arranged on a light incident surface of the light guide plate, and configured to form collimated light and control a light emitting direction such that a light ray incident into the light guide plate is transmitted in a total reflection manner;
a first light extraction layer, arranged on a first surface, adjacent to the light incident surface, of the light guide plate, wherein the first light extraction layer is provided with a plurality of light extraction outlets, and is configured to extract, in a collimated manner, the light ray transmitted inside the light guide plate through the light extraction outlets;
an extinction layer and a second light extraction layer, wherein the extinction layer and the second light extraction layer are sequentially superposed on one surface, facing the first surface of the light guide plate, of the array substrate along a direction towards the light guide plate, the extinction layer comprises a light guide region and a light absorption region which are arranged alternately, the second light extraction layer comprises a plurality of light extraction inlets, and an orthographic projection of the light extraction inlets onto the extinction layer is within the light guide region such that a light ray entering from the light extraction inlets is incident to the light guide region and transmitted to the light absorption region in a total reflection manner within the light guide region; and
a reflecting layer, arranged on a side, close to the light guide plate, of the second light extraction layer, comprising a plurality of reflecting portions each located between two adjacent light extraction inlets of the plurality of light extraction inlets, and configured to reflect collimated light extracted from the light extraction outlets to the light guide plate to exit from a second surface of the light guide plate, wherein the second surface is arranged opposite to the first surface;
wherein the liquid crystal dimming layer comprises a first electrode and a second electrode which are oppositely arranged, and a liquid crystal layer arranged between the first electrode and the second electrode,
in a first state, a voltage is applied to the first electrode and the second electrode, and the light ray exiting from the light extraction outlets is deflected by the liquid crystal layer and incident to the reflecting layer; and in a second state, no voltage is applied to the first electrode and the second electrode, and the light ray exiting from the light extraction outlets passes through the liquid crystal layer and then enters the extinction layer from the light extraction inlets.