Back light unit, display unit and display apparatus
Provided is a back light unit, a display unit and a display apparatus. The back light unit is configured to be disposed on a side of a display panel away from a display side, and includes a back plate and a plastic frame. The back plate includes a bottom plate and a side plate connected to an edge of the bottom plate, and a step is formed on an inner side of the side plate. The step has a first side away from the bottom plate and a second side away from an outer side of the side plate. The plastic frame is supported on the first side surface of the step, and a supporting part is disposed on an end surface of the side plate away from the bottom plate.
1. A back light unit configured to be disposed on a side of a display panel away from a display side, comprising a back plate and a plastic frame, wherein:
the back plate comprises a bottom plate and a side plate connected to an edge of the bottom plate,
a step is formed on an inner side of the side plate,
the step has a first side away from the bottom plate and a second side away from an outer side of the side plate,
the plastic frame is supported on the first side surface of the step,
a supporting part is disposed on an end surface of the side plate away from the bottom plate, and
the supporting part is configured to support a cover plate disposed on the display side of the display panel;
wherein an end face of the side plate away from the bottom plate is provided with a plurality of bosses distributed along a circumferential direction of the side plate,
the plurality of bosses are integrated with the back plate, and
the supporting part comprises the plurality of bosses.
2. The back light unit of claim 1 , wherein:
at least one of the bosses comprises a first boss disposed on an end face of the side plate away from the bottom plate and a second boss disposed on the first boss, and a surface of the second boss away from the bottom plate is configured to support the cover plate disposed on a display side of the display panel; or
a surface of at least one of the bosses away from the bottom plate is a plane, and a surface of the boss away from the bottom plate is configured to support the cover plate disposed on the display side of the display panel.
3. The back light unit of claim 2 , wherein
the cover plate is adhered to the end face of the side plate away from the bottom plate through a second adhesive layer, and
a thickness of the second adhesive layer is a height difference between the end face of the side plate away from the bottom plate and the surface of the boss away from the bottom plate.
4. The back light unit of claim 3 , wherein the height difference between the end face of the side plate away from the bottom plate and the surface of the boss away from the bottom plate is 0.3 mm-0.4 mm.
5. The back light unit of claim 1 , wherein
the end face of the side plate away from the bottom plate is provided with a first buffer layer, and
the supporting part comprises the first buffer layer.
6. The back light unit of claim 1 , wherein:
the plastic frame is adhered to a first side of the step through a first adhesive layer; or/and
a side of the plastic frame facing the bottom plate is provided with a buckle, and the buckle is clamped in a clamping hole or a clamping groove disposed on the back plate.
7. The back light unit of claim 6 , wherein
a circumferential edge of the side of the plastic frame facing the bottom plate is adhered and fixed on the first side of the step through the first adhesive layer, and
an inner edge of the plastic frame protrudes from a second side of the step.
8. The back light unit of claim 6 , wherein:
a plurality of buckles are disposed along the circumferential direction of the plastic frame,
a corresponding position of the back plate is provided with a clamping hole or a clamping groove, and
a shape of the buckle is matched with shapes of the clamping hole or the clamping groove.
9. The back light unit of claim 8 , wherein:
a clamping part is formed at an end of the buckle clamped into the clamping hole, and the clamping part protrudes toward an inner side or an outer side of the plastic frame;
an end of the clamping hole is located on the first side of the step, and the other end penetrates through the bottom plate in a direction parallel to the side plate;
a clamping limiting step is formed at the other end of the clamping hole on the bottom plate or side plate; and
when the buckle is clamped in the clamping hole, the clamping part is clamped in the clamping limiting step.
10. The back light unit of claim 1 , wherein
the back light unit further comprises a light source and a light guide plate,
the light guide plate is fixed on the bottom plate,
a light emitting surface of the light guide plate is disposed away from the bottom plate, and
the light source is fixed on the second side of the step and located on the side of the light guide plate.
11. The back light unit of claim 1 , wherein
the back light unit further comprises a plurality of optical diaphragms,
the plurality of optical diaphragms comprise a reflection sheet located between the light guide plate and the bottom plate,
a diffusion sheet and a prism sheet sequentially stacked on a side of the light guide plate away from the bottom plate, and
the prism sheet comprises a lower prism sheet and an upper prism sheet stacked on the diffusion sheet.
12. The back light unit of claim 1 , wherein the back plate is made of metal and the plastic frame is made of organic plastic.
13. The back light unit of claim 1 , wherein the side plate is disposed along a circumferential edge of the bottom plate and extends toward a side of the bottom plate, and a shape of the bottom plate is matched with a shape of the display panel.
14. A display unit, comprising a display panel, a cover plate disposed on a display side of the display panel, and the back light unit of claim 1 , wherein the back light unit is disposed on a side of the display panel away from the display side, and the cover plate is supported on the supporting part.
15. The display unit of claim 14 , wherein
an end face of the side plate away from the bottom plate is provided with a plurality of bosses distributed along a circumferential direction of the side plate, the plurality of bosses are integrated with the back plate, and the supporting part comprises the plurality of bosses; and
the cover plate is in contact with a surface of the boss away from the bottom plate, and the cover plate is adhered to an end face of the side plate away from the bottom plate through a second adhesive layer.
16. The display unit of claim 15 , wherein,
at least one of the bosses comprises a first boss disposed on the end face of the side plate away from the bottom plate and a second boss disposed on the first boss, and a surface of the second boss away from the bottom plate is configured to support the cover plate disposed on the display side of the display panel, or
a surface of at least one of the bosses away from the bottom plate is a plane, and a surface of the boss away from the bottom plate is configured to support the cover plate disposed on the display side of the display panel.
17. The display unit of claim 14 , wherein
a side of the plastic frame away from the bottom plate is provided with a second buffer layer, and
the second buffer layer is disposed opposite to a circumferential edge of the side of the display panel facing the bottom plate, and has a gap with the side of the display panel facing the bottom plate.
18. A display apparatus, comprising the display unit of claim 14 .
19. The display unit of claim 15 , wherein a height difference between the surface of the boss away from the bottom plate and the end face of the side plate away from the bottom plate is 0.3 mm-0.4 mm.