CN103076649A - Light guide plate and backlight source - Google Patents

Fig. 1 is the stereo decomposing structural representation of a kind of side-light type back light of prior art, backlight from top to bottom mainly comprises successively in the prior art: anti-dazzling screen 10, blooming piece 20, light guide plate (light guide plate, LGP) 30, light source 70,

40, reflector plate (reflector) 60 and

50, wherein:

Anti-dazzling screen 10, this anti-dazzling screen 10 is a rectangular hollow blooming piece, and it is mainly used in preventing the light leakage, and described anti-dazzling screen 10 is generally the shading rubber belt of black, and it can also be used for blooming piece 20, light guide plate 30 etc. is fixed on

40;

Light source 70 comprises a plurality of LED (light-emitting diode, light emitting diode), and a plurality of LED is integrated into a lamp bar, and this lamp bar sticks in the groove of

40 by adhesive tape 80;

40 is used for fixing and bearing optical diaphragm 20, light guide plate 30 and light source 70, because display panels also is placed in the

40,

40 also is used for the damping fluid LCD panel;

Reflector plate 60 is arranged between

40 and the

50, and the light that is used for not being scattered reflexes to light guide plate 30;

Chase 50 is complementary with

40, is used for placing and

40;

Described

40 comprises a plurality of grabs 41, and described

50 comprises a plurality of draw-in grooves 51, by grab 41 and corresponding being connected of draw-in groove 51 realizing the assembling of

40 and chase 50.

Fig. 2 is the vertical view of liquid crystal display, wherein:

900 is placed in the

40,

40 is placed in the

50, certainly exist

90 in

40 and the

50, then the border width of the backlight of this liquid crystal display equals the bee-line between the edge of the edge of

900 and chase 50.Particularly, when the wall thickness of

40 is d1, the wall thickness of

50 is d3, when the width in the

90 between

40 and the

50 is d2, and the border width d=d1+d2+d3 of backlight then.Wherein, because the restriction of condition of molding, the wall thickness of

40 is generally more than or equal to 0.45 millimeter in the prior art, the width in the

90 between

40 and the

50 generally is positioned at 0.05 millimeter to 0.1 millimeter scope, the wall thickness of

50 can be positioned at 0.1 millimeter to 0.3 millimeter scope, thus in the prior art border width of liquid crystal display at least more than or equal to 0.6 millimeter.

Blooming piece 20 and light source 70 are all fixed carrying by

40 in the above-mentioned technology, and the seal ring thickness of

40 becomes a critical limitation factor of the narrow frame of backlight.

With reference to figure 3 and shown in Figure 4, the present embodiment provides a kind of light guide plate, is used for placing blooming piece and light source, and the

1 of placement blooming piece is set at the upper surface of described light guide plate.What be positioned at

1 periphery is groove outer 7; Edge surface in described light guide plate arranges the through

2 of placing light source.

Because light guide plate also needs to arrange in the above the

1 that is complementary with blooming piece when realizing the light conducting function, so light guide plate should have certain thickness, and this thickness is greater than the thickness of blooming piece at least; And for so that light source is arranged in light guide plate, the thickness of described light guide plate also is greater than or equals the thickness of light source.

The thickness of light guide plate described in the present embodiment can and be less than or equal to 1.5 millimeters more than or equal to 0.2 millimeter, as: 0.2 millimeter, 0.45 millimeter, 0.8 millimeter, 1.0 millimeters or 1.5 millimeters.Thickness when the thickness of the light guide plate of indication refers to without any groove or through hole herein; With reference to shown in Figure 6, also can be described as the thickness H0 of groove outer 7.With reference to shown in Figure 6, the

1 of described

1 can be equal to or greater than the thickness of described blooming piece.Preferably, the

1 of described

1 equals the thickness of described blooming piece, and the shape size of described

1 is all identical with the shape size of described blooming piece, thus being housed in the described

1 of described blooming piece compactness.

Described blooming piece is same as the prior art, as: can comprise the first diffusion sheet, brightening piece and the second diffusion sheet.The thickness of described blooming piece can be more than or equal to 0.165 millimeter and less than 1.0 millimeters, therefore under the prerequisite of

1 less than the thickness of light guide plate that guarantees

1, the

1 of groove described in the

1 can be more than or equal to 0.165 millimeter and less than 1.0 millimeters, as: 0.165 millimeter, 0.4 millimeter, 0.65 millimeter or 0.9 millimeter.

Described light source is used for providing light, and it can comprise a plurality of LED, and described a plurality of LED can be integrated into a lamp bar.Correspondingly, be provided with a plurality of through

2 on the described light guide plate, a plurality of through

2 are complementary with a plurality of LED.With reference to shown in Figure 6, the degree of depth of described through

2 can be H3.

In order to guarantee light guide plate to the stability of light source loading, can LED be sticked in the described through

2 by glue (as: double faced adhesive tape), thereby through

2 is being parallel to size on the described light guide plate direction and can equaling the size sum of LED and glue.

Need to prove, can the section of existence poor (as shown in Figure 6) between the lower surface of the lower surface of described

1 and described

5, also the section of existence is not poor, and it is specifically determined by the factors such as thickness of blooming piece and power supply flexible PCB.

Comprise four symmetrically arranged the

3 in the present embodiment, and described the

3 is rectangle, the length of described the

3 can and be less than or equal to 3.0 millimeters more than or equal to 0.5 millimeter, as: 0.5 millimeter, 1.5 millimeters or 3.0 millimeters; The width of described the

3 can and be less than or equal to 1.0 millimeters more than or equal to 0.35 millimeter, as: 0.35 millimeter, 0.7 millimeter or 1.0 millimeters.

As an object lesson, with reference to shown in Figure 7, because the existence of described the

3, described blooming piece is housed in described

1 and described the first breach 3.Described shading rubber belt stickup also covers the face edge, light guide plate top that comprises described the

3.

As another object lesson, with reference to shown in Figure 8, groove outer 7 in the described light guide plate can also be provided with the second breach 6 of placing adhesive tape and mating with described adhesive tape, and described the second breach 6 is more shallow than described the

3, and described the

3 is arranged in described the second breach 6 scopes.Described adhesive tape is used for the fixed optics diaphragm, can be normal tape, also can be shading rubber belt, only need to play interception just passable for employed shading rubber belt between this moment blooming piece and the light guide plate, therefore can reduce to cover the area of shading rubber belt on the blooming piece, thereby enlarge viewing area backlight.

The present embodiment is complementary with blooming piece and is used for placing the

1 of blooming piece and is complementary with light source and is used for placing the through

2 of light source by arranging, thereby provide a kind of light guide plate that can fix with bearing optical diaphragm and light source, so that light guide plate can substitute the partial function of glue frame in the prior art.

In order to realize the narrow frame of backlight, the present invention also provides a kind of backlight that does not comprise the glue frame, with reference to shown in Figure 9, comprise: shading

100, blooming

200,

300,

600 and

500, wherein: described blooming

200 is arranged on the upper surface of described

300, described

600 is arranged on the side of described

300, the lower surface of described

300 is arranged on the described

500, described

500 comprises reflection horizon (not shown) and metal level (not shown), and described reflection horizon is adjacent with described

300.

Wherein, described

300, blooming

200 and

600 are with reference to previous embodiment.Particularly, described

300 is mainly used in changing line source into area source, can be fixed on the described

500 by adhesive tape 400 (as: double sticky tape).Described blooming

200 specifically can adopt any structure well-known to those skilled in the art, should not limit protection scope of the present invention at this.

Wherein, described shading

100 is a rectangular hollow blooming piece, be arranged on described blooming

200 upper surfaces around.The upper surface that described shading

100 is mainly used in preventing the light leakage and described blooming

200 is sticked on described

300.

Wherein, described

500 comprises reflection horizon and metal level, being about to reflector plate of the prior art and sheet metal is complex as a whole, described blooming

200 and described

600 all are fixed on the described

300, be that described

300 can replace the glue frame to realize the effect of the fixing described blooming

200 of carrying and described

600, reflection horizon after compound can substitute the realization of glue frame to the buffer action of display panels, final so that save these parts of glue frame in the backlight, realized the narrow frame of backlight; Saved simultaneously the cost of manufacture of backlight.

Wherein, the light that the reflection horizon of described

500 both had been used for not being scattered reflexes to

300, also is used for realization to the buffer action of display panels.The material for preparing described reflection horizon can comprise: polyethylene terephthalate is or/and polyethylene fibre.By the reflection horizon of described polyethylene terephthalate and polyethylene fibre preparation can with metal level carry out compound, higher to the luminance factor of light, preferably reflecting effect is namely arranged, and outstanding impact resistance and abrasion resistance is arranged.Need to prove, in other embodiments of the invention, can also adopt other to carry out compound, higher and the material of outstanding impact resistance and abrasion resistance is arranged as the material in reflection horizon to the luminance factor of light with metal level.In addition, the buffer action to display panels can be realized in described reflection horizon.

Wherein, the material for preparing the metal level of described

500 can comprise: iron or ferroalloy etc. resistance to wears and the material of impact resistance, concrete as: model is the steel of SUS430, steel that model is SUS304 or aluminium plating zinc plate etc.

The shape of described

500 can be for hollow, the rectangular parallelepiped of an opening is arranged, thereby described blooming

200 and

300 are arranged in the described rectangular parallelepiped.

The thickness of described

500 equals the thickness of described metal level and the thickness sum in described reflection horizon, and equal the border width of backlight, therefore the scope of the border width of described backlight can comprise: 0.2 millimeter～0.7 millimeter, as: 0.2 millimeter, 0.3 millimeter, 0.45 millimeter, 0.55 millimeter or 0.7 millimeter etc.

When being applied to above-mentioned backlight in the liquid crystal display, with reference to shown in Figure 10, described liquid crystal display can comprise:

820, be positioned at described

820 lower surfaces display

900, be positioned at the

810 of described

900 lower surfaces and be positioned at the

111 of described

810 lower surfaces, described

111 comprises underframe, and

810,

900 and

820 are positioned at described underframe successively.

Wherein, described

900 can comprise color membrane substrates and array base palte and the liquid crystal layer between described color membrane substrates and described array base palte that is oppositely arranged, and it is known for those skilled in the art, therefore do not repeat them here.

As a preferred version, with reference to shown in Figure 11, and in conjunction with consulting Fig. 9, Figure 11 shows that the surface structure schematic diagram of a side of liquid crystal display shown in Figure 10, four angles of described

500 arrange respectively groove.Particularly, be lower than the vertical height D2 of all the other positions at the vertical height D1 of the grooves at four jiaos of

500 places.Because blooming piece is arranged in the groove of

300, therefore the upper surface of described

111 zone lines is

300, the upper surface of fringe region is shading

100, and described shading

100 is between

810 and described

300.

The effect that the place, four angles of described

500 arranges groove is to avoid the corner (as: glass) of

900 and the corner of

500 to bump, thereby damages

900; Can also avoid the light of

300 to leak.Correspondingly, described groove can not be too dark, leaks with the light of avoiding

300; Described groove can not be too shallow, bumps with the corner with

500, the corner (as: glass) of avoiding display panels 900.Therefore, the setting of the vertical height of groove occurs to leak with the light that guarantees to avoid

300 and avoids the corner of the corner of

900 and

500 to bump and is as the criterion.The span of the difference in height between the upper surface of described groove and described

300 upper surfaces can comprise :-0.3 millimeter～0.3 millimeter, as :-0.3 millimeter ,-0.2 millimeter, 0 millimeter, 0.1 millimeter or 0.3 millimeter etc.Preferably, the difference in height between the upper surface of the upper surface of described groove and described

300 is 0, i.e. the upper surface flush of the upper surface of described groove and described

300.

The difference of the height of the upper surface of described

900 and described groove equals difference in height, the thickness of

810 and the thickness sum of described

100 between the upper surface of the upper surface of described groove and described

300.

1. a light guide plate is characterized in that, described light guide plate comprises the upper surface that is arranged on described light guide plate and the groove that is used for placing blooming piece; The edge that is arranged on described light guide plate also is used for placing the through hole of light source.

2. light guide plate as claimed in claim 1 is characterized in that, described light guide plate comprises that also described through hole is arranged in the described groove for the groove of placing the light source flexible circuit board, and described light source flexible circuit board and described light source weld together.

3. light guide plate as claimed in claim 2 is characterized in that, described light source flexible circuit board is pasted at described channel bottom by adhesive tape, and the degree of depth of described groove is equal to or greater than the thickness of described light source flexible circuit board and described adhesive tape.

4. light guide plate as claimed in claim 3 is characterized in that, the degree of depth of described groove is more than or equal to 0.08 millimeter and be less than or equal to 0.3 millimeter.

5. light guide plate as claimed in claim 1 is characterized in that, the thickness of described light guide plate is more than or equal to 0.2 millimeter and be less than or equal to 1.5 millimeters.

6. light guide plate as claimed in claim 1 is characterized in that, the degree of depth of described groove is equal to or greater than the thickness of described blooming piece.

7. light guide plate as claimed in claim 5 is characterized in that, the degree of depth of described groove is more than or equal to 0.165 millimeter and less than 1.0 millimeters.

8. light guide plate as claimed in claim 1 is characterized in that, the edge side at light source place arranges opening on the described light guide plate, and described opening is used for being connected of light source flexible circuit board and main flexible PCB.

9. light guide plate as claimed in claim 1, it is characterized in that, the groove outer of described light guide plate and described blooming piece protuberance corresponding section arrange a plurality of the first breach that are complementary, and perhaps the groove outer of described light guide plate is corresponding with described blooming piece recess arranges a plurality of teats.

10. light guide plate as claimed in claim 9 is characterized in that, described the first breach is rectangle.

11. light guide plate as claimed in claim 10 is characterized in that, the length of described the first breach is more than or equal to 0.5 millimeter and be less than or equal to 3.0 millimeters, and the width of described the first breach is more than or equal to 0.35 millimeter and be less than or equal to 1.0 millimeters.

12. light guide plate as claimed in claim 9, it is characterized in that, the groove outer of described light guide plate also is provided with the second breach of placing adhesive tape and mating with described adhesive tape, and described the second breach is more shallow than described the first breach, and described the first breach is arranged in described the second breach scope.

13. light guide plate as claimed in claim 12 is characterized in that, the degree of depth of described the second breach is more than or equal to 0.05 millimeter and be less than or equal to 0.2 millimeter.

14. backlight, it is characterized in that, comprise: each described light guide plate, blooming piece, light source and underframe in the claims 1 to 13, wherein: the lower surface of described light guide plate is arranged on the described underframe, described underframe comprises reflection horizon and metal level, and described reflection horizon is adjacent with described light guide plate; Described blooming piece is arranged in the groove of described light guide plate.

15. backlight as claimed in claim 14 is characterized in that, described light guide plate is fixed on the described underframe by adhesive tape.

16. backlight as claimed in claim 14 is characterized in that, the material in described reflection horizon comprises: polyethylene terephthalate is or/and polyethylene fibre.

17. backlight as claimed in claim 16 is characterized in that, the thickness range in described reflection horizon comprises: 0.1 millimeter～0.4 millimeter.

18. backlight as claimed in claim 14 is characterized in that, the material of described metal level comprises: iron or ferroalloy.

19. backlight as claimed in claim 18 is characterized in that, the thickness range of described metal level comprises: 0.1 millimeter～0.3 millimeter.

20. backlight as claimed in claim 14 is characterized in that, between described reflection horizon and the described metal level one deck glue is set.

21. backlight as claimed in claim 14 is characterized in that, described light source comprises a plurality of LED, and described a plurality of LED is integrated into a lamp bar.

22. backlight as claimed in claim 14 is characterized in that, four angles of described underframe arrange respectively a groove.

23. backlight as claimed in claim 14 is characterized in that, the difference in height scope between the upper surface of described groove and the upper surface of described light guide plate comprises :-0.3 millimeter～0.3 millimeter.