Patent ID: 11874487
Assignee: SHANGHAI TIANMA MICRO-ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G | IPC F

Claim 18:
19. The backlight module according to the claim 15,
wherein a surface of the converging portion adjacent to a light-incoming side of the light guide plate assembly comprises a first surface;
wherein a distance between the first surface and a light-exiting surface of the light guide plate assembly decreases along a direction from an edge of the aperture to the center of the aperture; and
wherein an angle formed between the first surface and the thickness direction of the backlight module is defined as β12, and a critical light-exiting angle of light emitted from the light-emitting element that satisfies a preset light intensity condition is defined as β2, where β12+β2=90°.