Light guide plate positioning design in backlight module

1. A backlight module, comprising:

a base with at least a sidewall;

a light guide plate disposed horizontally on the base, the light guide plate having a first edge corresponding to the sidewall;

an elastic member, disposed on the sidewall, for contacting the light guide plate to position the light guide plate relative to the sidewall in a first direction perpendicular to the sidewall; and

a second positioning unit, disposed on the base, for contacting the light guide plate to position the light guide plate relative to the sidewall in a second direction parallel to the sidewall,

wherein a resistance of the elastic member to a displacement of the light guide plate is greater than a resistance of the second positioning unit to the displacement of the light guide plate, the elastic member tolerates a displacement of the light guide plate more than the second positioning unit does.

2. The backlight module of claim 1 , wherein the elastic member has a connecting part and a curved portion, the connecting part is connected to the sidewall of the base, the curved portion protrudes toward and contacts against the first edge of the light guide plate.

3. The backlight module of claim 2 , wherein the connecting part includes:

a first clip portion connected with the curved portion;

a second clip portion disposed parallel to the first clip portion; and

a bridging portion connecting to a side of the first clip portion and a side of the second clip

portion,

wherein the connecting part is disposed across the sidewall, the bridging portion traverses

across a top of the sidewall, and the first chip portion and the second clip portion are

disposed on two opposite sides of the sidewall.

4. The backlight module of claim 2 , wherein the elastic member comprises multiple connecting parts, two ends of the curved portion respectively connect with different connecting parts, a middle section of the curved portion protrudes toward the light guide plate to form an arch shape.

5. The backlight module of claim 2 , wherein the sidewall is more rigid than the elastic member.

6. The backlight module of claim 5 , wherein a thickness of the sidewall is greater than a thickness of the elastic member.

7. The backlight module of claim 2 , further comprising a positioning frame disposed between the sidewall and the first edge, wherein the positioning frame has an opening, and the curved portion of the elastic member passes through the opening to contact the first edge.

8. The backlight module of claim 1 , wherein the second positioning unit is a positioning pillar, a positioning groove is formed in the light guide plate, and the positioning pillar is received in the positioning groove and touches against a wall of the positioning groove.

9. The backlight module of claim 8 , wherein a length of the positioning groove in the first direction is greater than a length of the positioning groove in the second direction.

10. The backlight module of claim 9 , wherein a gap exists between the positioning pillar and the wall of the positioning groove in the first direction, and the positioning pillar touches against the wall of the positioning groove in the second direction.

11. The backlight module of claim 1 , wherein the base is a heat dissipation plate or a back plate.

12. The backlight module of claim 9 , wherein the base includes:

a back plate, wherein the sidewall is connected to a side of the back plate; and

a light source module, disposed on the back plate, including a light source and a holder,

the light source extending along the first direction and being connected to the holder, the

light source emitting light toward a second edge of the light guide plate,

wherein the holder has a baseplate disposed between the back plate and the light guide plate, and the positioning pillar is disposed on the baseplate.

13. A backlight module, comprising:

a base comprising at least a sidewall;

a light guide plate, disposed horizontally on the base, having a first edge corresponding to the

sidewall;

an elastic member having a connecting part and a curved portion, the connecting part being

connected to the sidewall of the base, the curved portion protruding toward and touching

against the first edge of the light guide plate in a direction toward an inner area of the light

guide plate, wherein the elastic member positions the light

guide plate relative to the sidewall in a first direction perpendicular to the sidewall.

14. The backlight module of claim 13 , wherein the connecting part includes:

a first clip portion connected with the curved portion;

a second clip portion disposed parallel to the first clip portion; and

a bridging portion connected between the first clip portion and the second clip portion,

wherein the connecting part is disposed across the sidewall, the first chip portion and the

second clip portion are disposed on two opposite sides of the sidewall, and the bridging

portion traverses across the sidewall.

15. The backlight module of claim 13 , wherein the elastic member comprises multiple connecting parts, wherein two ends of the curved portion respectively connect with different connecting parts, and a middle section of the curved portion protrudes toward the light guide plate to form an arch shape.

16. The backlight module of claim 13 , wherein the sidewall is more rigid than the elastic member.

17. The backlight module of claim 16 , wherein a thickness of the sidewall is greater than a thickness of the elastic member.

18. The backlight module of claim 13 , further comprising a positioning frame disposed between the sidewall and the first edge, wherein the positioning frame has an opening, and the curved portion of the elastic member protrudes through the opening to touch against the first edge.

19. The backlight module of claim 13 , further comprising a positioning pillar disposed on the base, wherein a positioning groove is formed in the light guide plate, the positioning pillar is received in the positioning groove and touches against a wall of the positioning groove, and the positioning pillar positions the light guide plate relative to in a second direction parallel to the sidewall.

20. The backlight module of claim 13 , wherein a length of the positioning groove in the first direction is greater than a length of the positioning groove in the second direction.

21. The backlight module of claim 20 , wherein a gap exists between the positioning pillar and the wall of the positioning groove in the first direction, and the positioning pillar touches against the wall of the positioning groove in the second direction.

22. The backlight module of claim 13 , wherein the base is a heat dissipation plate or a back plate.

23. The backlight module of claim 20 , wherein the base includes:

a back plate, wherein the sidewall is connected to a side of the back plate; and

a light source module, disposed on the back plate, including a light source and a holder, the

light source extending along the first direction and being connected to the holder, the light

source emitting light toward a second edge of the light guide plate,

wherein the holder has a baseplate disposed between the back plate and the light guide plate, and the positioning pillar is disposed on the baseplate.