Patent ID: 11860400
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G | IPC F

Claim 17:
18. The display device according to claim 13, wherein, the backlight component further comprises: a filling layer, a light absorbing layer, at least one projective coupling grating and at least one reflective coupling grating;
the light guide plate is between the light emitting device and the optical element, and the optical element includes a holographic microstructure with a polarization-dependent characteristic;
the projective coupling grating is on the light emitting surface of the light guide plate, and the reflective coupling grating is on the surface away from the light emitting surface, and the light intensity ratio corresponding to the coupling gratings is positively correlated with the distance between the coupling grating and the optical element; each of the coupling gratings is configured to: convert the parallel beam that is incident to be an emitting beam at a light intensity ratio corresponding to the position where the coupling grating is located, the emitting beam being a collimated beam propagating in a direction away from the light guide plate;
the filling layer is on both sides of the light guide plate in the thickness direction, wherein the material refractive index of the light guide plate is greater than the material refractive index of the filling layer, and the light guide plate and the filling layer include transparent material;
the light absorbing layer is on at least one side of the light guide plate, the orthographic projection of the light emitting device on the light emitting surface of the light guide plate is in the orthographic projection of the light absorbing layer on the light emitting surface;
wherein the light emitting device is a blue light emitting device; the light conversion layer comprises a first light transmissive region, a transparent region and a second light transmissive region; wherein the light conversion layer in the first light transmissive region comprises a first photoluminescent material for converting blue light into red light; and the light conversion layer in the second light transmissive region comprises a second photoluminescent material for converting blue light into green light;
wherein display device further comprises: a buffer layer, a transistor device layer, a planarization layer, a light conversion layer and a counter substrate; wherein the buffer layer, the transistor device layer, the planarization layer, the light conversion layer and the counter substrate are sequentially stacked in a direction away from the back.