CN100549779C

CN100549779C - Backlight assembly and have the LCD of this backlight assembly

Info

Publication number: CN100549779C
Application number: CNB2005100766789A
Authority: CN
Inventors: 金东勋; 朴辰赫; 崔震成; 朴钟大
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Display Co Ltd
Priority date: 2004-06-16
Filing date: 2005-06-13
Publication date: 2009-10-14
Anticipated expiration: 2025-06-13
Also published as: KR20050119230A; CN1713053A

Abstract

The invention discloses a kind of LCD that improves the backlight assembly of presentation quality and have this backlight assembly.Backlight assembly comprise comprise the lamp that produces light and reflection from the lamp assembly of the lamp reflecting plate of the light of lamp, receive the plane of incidence, comprise and extend from one side of the plane of incidence and have the bottom surfaces of prism pattern and extend and in the face of the light guide plate of the upper side of bottom surfaces and the admittance container of admitting lamp assembly and light guide plate from other faces of the plane of incidence from the light of lamp assembly.Here, prism pattern is made up of adjacent a plurality of prisms, and it is highly more little near the plane of incidence more for the projection of each prism.Thereby, remove the bright line that produces at plane of incidence adjacent area, improve presentation quality.

Description

Backlight assembly and have the LCD of this backlight assembly

Technical field

The present invention relates to a kind of backlight assembly and have the LCD of this backlight assembly, more specifically, relate to and a kind ofly have the backlight assembly of high gray scale and have the LCD of this backlight assembly.

Background technology

Usually, LCD is one of panel display apparatus that utilizes liquid crystal display image, has than advantages such as other display device are light, thin, driving voltage is low and electric power consumption is low, has obtained widespread use industrial.

LCD comprises by thin film transistor (TFT) (hereinafter to be referred as TFT) substrate, in the face of the color filter substrate of TFT substrate and get involved between above-mentioned two substrates and along with received signal changes the display panels that the liquid crystal of transmittance is formed.And, because the display panels of display image is can not self luminous non-photism element in the LCD, so the backlight assembly of light need be provided to display panels.

Backlight assembly comprises the lamp that produces light, to the light guide plate of display panels guiding from the light path of side light.Recently, developed the prismatic light guide plate for high gray processing and the cost degradation of realizing backlight assembly.The prismatic light guide plate is the light guide plate that forms little spacing prism pattern at its underpart face, and this light guide plate is only used a reversed prism thin slice, has the advantage of the gray scale higher than prior art.

Yet the prismatic light guide plate has the low drawback of presentation quality because of forming prism pattern in bottom surfaces.That is, concentrate light, in the upper side that light penetrates, produce bright line and concealed wire, reduced presentation quality with plane of incidence adjacent areas by the plane of incidence edge of incident light.

Summary of the invention

The present invention is intended to solve above-mentioned drawback, and the object of the invention is to provide a kind of bright line of removing the prismatic light guide plate and concealed wire to improve the backlight assembly of presentation quality.

Another object of the present invention is to provide a kind of LCD with above-mentioned backlight assembly.

The backlight assembly of realizing the invention described above purpose comprises lamp and the light guide plate that is used to produce light.Above-mentioned light guide plate comprises the plane of incidence of the light incident that lamp produces, extend and form the reflecting surface of prism pattern from one side of the plane of incidence and extend and in the face of the outgoing plane of reflecting surface from the another side of the plane of incidence.At this moment, the interior angle of the plane of incidence and outgoing plane composition is less than 90 °.Particularly, the interior angle of the plane of incidence and outgoing plane composition is 89.5 °.

The backlight assembly of realizing the invention described above purpose comprises lamp and the light guide plate that produces light.Light guide plate comprises the plane of incidence of the light incident that lamp produces, extend and form the reflecting surface of prism pattern from one side of the plane of incidence and extend and in the face of the outgoing plane of reflecting surface, the interior angle that the plane of incidence and outgoing plane are formed is less than 90 ° from the another side of the plane of incidence.Prism pattern is made up of interconnected a plurality of prisms, and it is highly more little near the plane of incidence more from the plane of incidence first place spaced apart by a predetermined distance for each prism, forms concavo-convex from the plane of incidence to first place.

Another backlight assembly of realizing the object of the invention comprises lamp and the light guide plate that is used to produce light.Light guide plate comprises the plane of incidence of the light incident that lamp produces, extend and form the reflecting surface of prism pattern from one side of the plane of incidence and extend and in the face of the outgoing plane of reflecting surface from the another side of the plane of incidence.Prism pattern is made up of interconnective a plurality of prisms, and it is highly more little near the plane of incidence more for prism.It is highly more little near the plane of incidence more from the plane of incidence first place spaced apart by a predetermined distance for prism.

The backlight assembly of realizing the object of the invention comprises lamp and the light guide plate that produces light.Light guide plate includes the plane of incidence of the light that shot-light produces, extend and form the reflecting surface of prism pattern from a limit of the plane of incidence and extend and in the face of the outgoing plane of reflecting surface from the another side of the plane of incidence.Prism pattern forms concavo-convex from the place that the plane of incidence separates with preset distance by interconnecting and forming with the vertical a plurality of prisms that form with the prism length direction in the prism.

The LCD that realizes the invention described above purpose comprises backlight assembly and display panels.Backlight assembly comprises the plane of incidence of the light incident that the lamp that produces light, lamp produce, extend and form the reflecting surface of prism pattern from one side of the plane of incidence and extend from other limits of the plane of incidence and in the face of the outgoing plane of reflecting surface, comprises that angle that the plane of incidence and outgoing plane form is less than 90 ° light guide plate.The light that LCD utilizes backlight assembly to provide comes display image.

The LCD that realizes another purpose of the invention described above comprises backlight assembly and display panels.Backlight assembly comprises the plane of incidence that produces the lamp be used for light, light incident that lamp produces, extend and form the reflecting surface of prism pattern from one side of the plane of incidence and from other limit extended surfaces of plane of incidence outgoing plane to reflecting surface.Prism pattern is made up of interconnected a plurality of prisms, and it is highly more little the closer to the plane of incidence for prism.The light display image that display panels utilizes backlight assembly to provide.

This backlight assembly and have the LCD of this backlight assembly can be removed bright line and concealed wire that the light in part of light guide plate produces, to improve presentation quality.

Description of drawings

Fig. 1 is the decomposition diagram of backlight assembly according to an embodiment of the invention;

Fig. 2 is the light guide plate prism pattern skeleton view shown in Fig. 1;

Fig. 3 is the light guide plate sectional view along I-I ' line of Fig. 1;

Fig. 4 is the light guide plate skeleton view according to other embodiments of the invention;

Fig. 5 is the sectional view in the light guide plate cross section shown in Fig. 4;

Fig. 6 is a light guide plate skeleton view according to another embodiment of the present invention;

Fig. 7 is the sectional view in the light guide plate cross section shown in Fig. 6;

Fig. 8 is a light guide plate skeleton view according to another embodiment of the present invention;

Fig. 9 is the sectional view in the light guide plate cross section shown in Fig. 8;

Figure 10 is a light guide plate sectional view according to another embodiment of the present invention;

Figure 11 is a light guide plate skeleton view according to another embodiment of the present invention;

Figure 12 is the sectional view in the light guide plate cross section shown in Figure 11;

Figure 13 is the skeleton view of light guide plate according to another embodiment of the present invention;

Figure 14 is the sectional view in the light guide plate cross section shown in Figure 13;

Figure 15 is a light guide plate sectional view according to another embodiment of the present invention;

Figure 16 is a light guide plate sectional view according to another embodiment of the present invention; And

Figure 17 is a LCD decomposition diagram according to an embodiment of the invention.

Symbol description

100: backlight assembly 200: lamp

300: light guide plate 310: the plane of incidence

320: reflecting surface 330: outgoing plane

350: prism pattern 360: prism

410: reflection sheet 420: otpical leaf

900: display unit 910: display panels

920: driving circuit portion 1000: LCD

Embodiment

Below, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is the decomposition diagram of backlight assembly according to an embodiment of the invention, and Fig. 2 is the light guide plate prism pattern skeleton view shown in Fig. 1, and Fig. 3 is the light guide plate sectional view along I-I ' line of Fig. 1.

With reference to Fig. 1, Fig. 2 and Fig. 3, backlight assembly 100 comprises lamp 200 and the light guide plate 300 that is used to produce light according to an embodiment of the invention.

In light guide plate 300 1 sides a lamp 200 is set at least.Lamp 200 responses produce light from the driving voltage of outside inverter (not shown).A wherein example of lamp 200 is made up of elongated cylindrical cold-cathode fluorescence lamp (CCFL).And, lamp 200 can be placed two sidepieces in the face of light guide plate 300.

The light path that light guide plate 300 changes from lamp 200 penetrates to specific direction.Light guide plate 300 comprises the plane of incidence 310 of the light incident that lamp 200 produces, the reflecting surface 320 that extends from one side of the plane of incidence 310 and the outgoing plane 330 that extends and face reflecting surface 320 from other limits of the plane of incidence 310.Reflecting surface 320 in light guide plate 300 forms the prism pattern 350 of controlling the light path of incidents by reflecting surface 310.

With reference to Fig. 2, prism pattern 350 is made up of interconnected a plurality of prisms 360.Each prism 360 is the triangular column shape that extends to perpendicular to the direction of the plane of incidence 310.Particularly, prism 360 comprises first dip plane 362 and second dip plane 364, and first dip plane 362 and second dip plane 364 are interconnected to form projection 366 and recess 368.The shape of prism 360 can have multiple shape according to gamma characteristic.For example, the interior angle θ 1 that is formed by first dip plane 362 and second dip plane 364 is about 105 °, and the distance between the adjacent projection 366 or the spacing PW of the distance between the adjacent recesses 368 are about 25 μ m.

With reference to Fig. 3, bright line and concealed wire that the plane of incidence 310 produces near the incident light portion of removing the plane of incidence 310 are for the normal N L predetermined oblique angle of outgoing plane 330.That is, the interior angle θ 2 of the plane of incidence 310 and outgoing plane 330 compositions is less than 90 °.Preferably, the plane of incidence 310 slopes inwardly about 0.5 ° for the normal N L of outgoing plane 330.Therefore, the plane of incidence 310 is about 89.5 ° with the interior angle θ 2 of outgoing plane 330 compositions.

In addition, light guide plate 300 is from the more little chock shape of the plane of incidence 310 its thickness far away more.For example, the thickness of the plane of incidence 310 is about 2.7mm, and the thickness on the plane of incidence 310 opposites is about 0.8mm.Therewith differently, light guide plate 300 can have certain thickness in whole zone.

Refer again to Fig. 1, backlight assembly 100 further comprises the reflection sheet 410 that places light guide plate 300 reflectings surface 320 bottoms.Reflection sheet 410 reflections leak into outside light by the reflecting surface 320 of light guide plate 300, incide light guide plate 300 inside again.Reflection sheet 410 is made up of the high material of luminous reflectance.

For example, reflection sheet 410 is made up of polyethylene terephthalate (PET) material or polycarbonate (PC) material etc.

Backlight assembly 100 further comprises at least one otpical leaf 420 that places light guide plate 300 outgoing planes 330 tops.The light path that otpical leaf 420 changes passing through outgoing plane 330 penetrates is to improve the gamma characteristic of backlight assembly 100.For example, otpical leaf 420 further comprises the reversed prism thin slice of raising from the positive gray scale of the light of light guide plate 300.The reversed prism thin slice is at the otpical leaf that forms prism pattern in the face of the bottom surfaces of light guide plate 300 outgoing planes 330.At this moment, be formed at the prism pattern of reversed prism thin slice to form perpendicular to the direction that is formed on the prism pattern 350 on the light guide plate 300.Like this, form prism pattern, also can not obtain high gray scale thereby do not append independent prism thin slice with direction perpendicular to light guide plate 300 and reversed prism thin slice.And though not shown, otpical leaf 420 further comprises the diffusion thin slice.The diffusion thin slice places the bottom or the top of reversed prism thin slice, and diffusion is from the light of light guide plate 300 or the ejaculation of reversed prism thin slice, to improve the light gradation uniformity.In addition, backlight assembly 100 can append or remove multiple otpical leaf according to required gamma characteristic.

Fig. 4 is a light guide plate skeleton view according to another embodiment of the present invention, and Fig. 5 is the sectional view in the light guide plate cross section shown in Fig. 4.

With reference to Fig. 4 and Fig. 5, light guide plate 500 comprises the plane of incidence 510 of incident light, the reflecting surface 520 that extends from one side of the plane of incidence 510 and the outgoing plane 530 that extends and face reflecting surface 520 from other limits of the plane of incidence 510 according to an embodiment of the invention.

The normal N L of 510 pairs of outgoing planes 530 of the plane of incidence tilts at a certain angle.That is, the interior angle θ 2 of the plane of incidence 510 and outgoing plane 530 formation is less than 90 °.Preferably, the normal N L of 510 pairs of outgoing planes 530 of the plane of incidence slopes inwardly 0.5 °.Therefore, the interior angle of the plane of incidence 510 and outgoing plane 530 formation is about 89.5 °.

Form the prism pattern 550 of controlling travel path of incident light by the plane of incidence 510 at reflecting surface 520.Prism pattern 550 is made up of interconnective a plurality of prisms 560.Each prism 560 is the triangulo column shape that the direction vertical with the plane of incidence 510 extended.Prism 560 comprises that

first dip plane

562 and 564, the first dip plane 562, second dip plane contact formation projection 566 and recess 568 with second dip plane 564.Prism 560 can be multiple shape according to required gamma characteristic.For example, the interior angle that first dip plane 562 and second dip plane 564 are formed is about 105 °, and the spacing between distance between the adjacent projection 566 or the adjacent recess 568 is about 25 μ m.

In the present embodiment, it is highly more little the closer to the plane of incidence 510 for prism 560.Particularly, the first place P1 of prism 560 from separating with preset distance with the plane of incidence 510, it is highly more little near the plane of incidence more.Here, as shown in Figure 5, the height of prism 560 means from prism 560 bases of triangle to the distance of vertical direction.Prism 560 height are linearity near the plane of incidence 510 more from the first place P1 and reduce.For example, the height h1 that the first place P1 goes up prism 560 is about 9 μ m, is about 5 μ m at the height h2 of the plane of incidence 510 prisms 560, and at this moment, between the plane of incidence 510 and first place is in the scope of about 20-60mm apart from d.Preferably, particularly be about 40mm apart from d between the plane of incidence 510 and the first place P1.In addition, prism 560 height is linear near the plane of incidence 510 more from the first place P1 to be reduced, the ratio that diminishes with increase.

Like this, if reduce more near the height of the plane of incidence 510 prisms 560 more, then light reflection and crooked area diminish than other zones, can more effectively prevent generation bright line and concealed wire near the plane of incidence 510.

In addition, light guide plate 500 is the chock shape that reduces more from the plane of incidence 510 its thickness far away more.Therewith differently, light guide plate 500 can have certain thickness in whole zone.

Fig. 6 is a light guide plate skeleton view according to another embodiment of the present invention, and Fig. 7 is the sectional view in the light guide plate cross section shown in Fig. 6.

With reference to Fig. 6 and Fig. 7, light guide plate 600 comprises the plane of incidence 610 of incident light, the reflecting surface 620 that extends from one side of the plane of incidence 610 and the outgoing plane 630 that extends and face reflecting surface 620 from the another side of the plane of incidence 610 according to another embodiment of the present invention.

610 pairs of outgoing planes of the plane of incidence, 630 normal N L predetermined oblique angle, the interior angle θ 2 that the plane of incidence 610 and outgoing plane 620 are formed is less than 90 °.For example, the normal N L of 610 pairs of outgoing planes 630 of the plane of incidence slopes inwardly about 0.5 °, and the interior angle θ 2 of the plane of incidence 610 and outgoing plane 630 compositions is about 89.5 °.

Form prism pattern 650 on the reflecting surface 620 by the light path of the plane of incidence 610 control incidents.Prism pattern 650 is made up of a plurality of prisms 660 of continuous connection.Each prism 660 is the triangle cylinder shape that extends with perpendicular to the plane of incidence 610 directions.Prism 660 comprises first dip plane 662 and second dip plane 664, and first dip plane 662 contacts formation projection 666 and recess 668 with second dip plane 664.The shape of prism 660 can have multiple shape according to required gamma characteristic.For example, the interior angle that first dip plane 662 and second dip plane 664 are formed is about 105 °, and the spacing between distance between the adjacent projection 666 or the adjacent recess 668 is about 25 μ m.

In the present invention, projection 666 parts at prism 660 form jog 670.Jog 670 is formed into and the plane of incidence 610 first place P1 spaced apart by a predetermined distance from the plane of incidence 610 always.At this moment, be about 20-60mm apart from d between the plane of incidence 610 and the first place P1.For example, wherein be about 40mm apart from d between an example plane of incidence 610 and the first place P1.Jog 670 can be the multiple shape of scattered reflection light.For example, jog 670 is arch shape.The width a of the jog 670 of arch shape is about 135 μ m, and the degree of depth b of jog 670 is about 1.5 μ m.

Like this, if on prism 660 projectioies 666 adjacent, form jog 670 with the plane of incidence 610, then can scattered reflection light by jog 670, so can effectively prevent the bright line and the concealed wires of near the generations reflecting surface 610.

In addition, light guide plate 600 is the chock shape that reduces more from the plane of incidence 610 its thickness far away more.Different therewith, light guide plate 600 has certain thickness in whole zone.

Fig. 8 is a light guide plate skeleton view according to another embodiment of the present invention, and Fig. 9 is the sectional view in the light guide plate cross section shown in Fig. 8.

With reference to Fig. 8 and Fig. 9, light guide plate 700 comprises the plane of incidence 710 of incident light, the reflecting surface 720 that extends from one side of the plane of incidence 710 and the outgoing plane 730 that extends and face reflecting surface 720 from other limits of the plane of incidence according to another embodiment of the present invention.

The normal N L predetermined oblique angle of 710 pairs of outgoing planes 730 of the plane of incidence, the interior angle θ 2 that the plane of incidence 710 and outgoing plane 730 are formed is less than 90 °.For example, the plane of incidence 710 tilts about 0.5 ° for the normal N L of outgoing plane 730, and the plane of incidence 710 is about 89.5 ° with the interior angle θ 2 that outgoing plane 730 is formed.

Form the prism pattern 750 that a plurality of prisms 760 connect continuously on the reflecting surface 720.Each prism 760 is the triangle cylinder shape that extends with perpendicular to the direction of the plane of incidence 710.Prism 760 comprises first dip plane 762 and second dip plane 764, and first dip plane 762 and second dip plane 764 are in contact with one another and form projection 766 and recess 768.The shape of prism 760 can have multiple shape according to required gamma characteristic.For example, the interior angle that first dip plane 762 and second dip plane 764 are formed is about 105 °, and distance is about 25 μ m between distance between the adjacent projection 766 or the adjacent recess 768.

It is highly more little near the plane of incidence 710 more from the first place P1 that separates with preset distance with the plane of incidence 710 for prism 760.The height of prism 760 reduces with linear near the plane of incidence 710 more from the first place P1.For example, be about 9 μ m, be about 5 μ m at the height h2 of the plane of incidence 710 prisms 760 at the height h1 of the first place P1 prism 760.At this moment, the distance between the plane of incidence 710 and the first place P1 is at 20-60mm.For example, be about 40mm apart from d between the plane of incidence 710 and the first place P1.In addition, prism 760 height is linearity near the plane of incidence 710 more from the first place P1 and reduces, the ratio that reduces with increase.

Form jog 770 at prism 760.Jog 770 is formed into the first place P1 that separates with a segment distance from the plane of incidence always from the plane of incidence 710.Jog 770 can be the multiple shape of scattered reflection light.For example, jog 770 has arch shape.The width a of the jog 770 of arcuate in shape is about 135 μ m, and the degree of depth of jog 770 is about 1.5 μ m.

Like this, the height near the plane of incidence 710 prisms 760 is more little more, simultaneously if form jog 770 on the projection 766 of the prism 760 of the adjacency plane of incidence 710, can prevent near the bright line and the concealed wire of generation the plane of incidence 710 more effectively.

In addition, light guide plate 700 is from the more little chock shape of the plane of incidence 710 its thickness far away more.Therewith differently, light guide plate 700 has certain thickness in whole field.

Figure 10 is the sectional view of light guide plate according to another embodiment of the present invention.

With reference to Figure 10, light guide plate 800 comprises the plane of incidence 810 of incident light, the reflecting surface 820 that extends from one side of the plane of incidence 810 and the outgoing plane 830 that extends and face reflecting surface 820 from other limits of the plane of incidence 810 according to another embodiment of the present invention.

The normal N L predetermined oblique angle of 810 pairs of outgoing planes 830 of the plane of incidence, the interior angle θ 2 that the plane of incidence 810 and outgoing plane 830 are formed is less than 90 °.For example, the normal of 810 pairs of outgoing planes 830 of the plane of incidence slopes inwardly about 0.5 °, and the interior angle θ 2 of the plane of incidence 810 and outgoing plane 830 compositions is about 89.5 °.

Form the prism pattern 850 that a plurality of prisms connect continuously on the reflecting surface 820.Each prism is the triangle cylinder shape that extends with perpendicular to the direction of the plane of incidence 810.The shape of prism can have multiple shape according to required gamma characteristic.For example, it is highly more little near the plane of incidence 810 more from the place that separates with preset distance with the plane of incidence 810 for prism.And, on prism, form concavo-convex to the place that separates with preset distance from the plane of incidence 810.

In the present embodiment, the plane of incidence 810 is round shape (round) with first edge 812 and the plane of incidence 810 that outgoing plane 830 meets with second edge 814 that reflecting surface meets on the light guide plate 800.Like this,, then prevent, can remove effectively and near the plane of incidence 810, produce bright line and concealed wire in the marginal portion gathered light if the marginal portion of the plane of incidence 810 is become the circle processing.

In addition, light guide plate 800 is from the more little chock shape of the plane of incidence 810 its thickness far away more.Therewith differently, light guide plate 800 can have certain thickness in whole zone.

Figure 11 is the skeleton view of light guide plate according to another embodiment of the present invention, and Figure 12 is the sectional view in the light guide plate cross section of Figure 11.

With reference to Figure 11 and Figure 12, comprise the plane of incidence 1110 of incident light, the reflecting surface 1120 that extends from one side of the plane of incidence 1110 and from other limit extended surfaces of the plane of incidence 1110 outgoing plane 1130 to reflecting surface 1120 according to the light guide plate 1100 of other embodiments of the invention.In the present embodiment, the plane of incidence 1110 forms the right angle with outgoing plane 1130.

Form the prism pattern 1150 of controlling light paths by the plane of incidence 1110 at reflecting surface 1120.Prism pattern 1150 is made up of a plurality of prisms 1160 connected to one another.Each prism 1160 has the triangular prism shape of extending with perpendicular to the direction of the plane of incidence 1110.Prism 1160 comprises first dip plane 1162 and second dip plane 1164, and first dip plane 1162 and second dip plane 1164 contact with each other and form projection 1166 and recess 1168.The shape of prism 1160 can have multiple shape according to required gamma characteristic.For example, the interior angle that first dip plane 1162 and second dip plane 1164 are formed is about 120 °, and the distance between distance between the adjacent projection 1166 or the adjacent recess 1168 is about 50-60 μ m.

In the present embodiment, prism 1160 is the approaching more nearly plane of incidence 1110 it is highly more little.Particularly, it is highly more little near the plane of incidence 1110 more from the first place P1 that separates with preset distance from the plane of incidence 1110 for prism.The height of prism 1160 reduces with linearity near the plane of incidence 1110 more from the first place P1.For example, be about 25 μ m, be about 9 μ m at the height h2 of the plane of incidence 1110 prisms 1160 at the height of the first place P1 prism 1160.At this moment, between the plane of incidence 1110 and the first place P1 apart from d at 2-6mm.In addition, prism 1160 height reduce with streamlined near the plane of incidence 1110 more from the first place P1, make and reduce the ratio increase.

In addition, light guide plate 1100 is more near the more little chock shape of the plane of incidence 1110 its thickness.Different therewith, light guide plate 1100 can have certain thickness in whole zone.

Figure 13 is the skeleton view of light guide plate according to another embodiment of the present invention, and Figure 14 is the sectional view in the light guide plate cross section shown in Figure 13.

With reference to Figure 13 and Figure 14, light guide plate 1200 comprises the plane of incidence 1210 of incident light, the reflecting surface 1220 that extends from one side of the plane of incidence 1210 and the outgoing plane 1230 that extends and face reflecting surface 1220 from other limits of the plane of incidence 1210 according to another embodiment of the present invention.And the plane of incidence 1210 forms the right angle with outgoing plane 1230.

Form the prism pattern 1250 that connects a plurality of prisms 1260 continuously at reflecting surface 1220.Each prism 1260 is the triangulo column shape that extends with perpendicular to the direction of the plane of incidence 1210.Prism 1260 comprises that first dip plane 1262 and 1264, the first dip plane 1262, second dip plane and second dip plane 1264 contact with each other and forms projection 1266 and recess 1268.Prism 1260 can have multiple shape according to required gamma characteristic.For example, the interior angle formed of first dip plane 1262 and second dip plane 1264 be about 120 ° between the adjacent projection 1266 distance or the distance between the adjacent recess 1268 at 50-60 μ m.

It is highly more little near the plane of incidence 1210 more from the first place P1 that separates with preset distance with the plane of incidence 1210 for prism 1260.The height of prism 1260 is linearity near the plane of incidence 1210 more from the first place P1 and reduces.For example, be about 25 μ m at the height h1 of the first place P1 prism 1260, the height h2 of prism 1260 is about 9 μ m on the plane of incidence 1210.Simultaneously, between the plane of incidence 1210 and the first place P1 apart from d at 2-6mm.And prism 1260 height reduces from the first place P1 to the plane of incidence 1210 with the streamlined shape that increase reduces ratio.

Form the jog 1270 of scattered reflection light on the prism 1260.Jog 1270 is formed into the first place P1 that separates with preset distance from the plane of incidence 1210 always from the plane of incidence 1210.Jog 1270 can have multiple shape for scattered reflection light.For example, jog 1270 has arch shape.

In addition, light guide plate 1200 is the chock shape from the plane of incidence 1210 its less thick far away more.Different therewith, light guide plate 1200 can form certain thickness in whole zone.

Figure 15 is the sectional view of light guide plate according to another embodiment of the present invention.

With reference to Figure 15, light guide plate 1300 comprises the plane of incidence 1310 of incident light, the reflecting surface 1320 that extends from one side of the plane of incidence 1310 and the outgoing plane 1330 that extends and face reflecting surface 1320 from other limits of the plane of incidence 1310 according to another embodiment of the present invention.The plane of incidence 1310 forms the right angle with outgoing plane 1330.

Form the prism pattern 1350 that connects a plurality of prisms 1360 continuously on the reflecting surface 1320.Each prism 1360 is the triangulo column shape of extending with perpendicular to the direction of the plane of incidence 1310.Prism 1360 can have multiple shape according to required gamma characteristic.For example, it reduces prism 1350 highly more near the plane of incidence 1310 more from the first place P1 that separates with preset distance from the plane of incidence 1310.And, form concavo-convex from the plane of incidence 1310 up to separating the first place P1 on the prism 1350 with preset distance.

In the present embodiment, second edge, the 1314 rounded shapes that meet of first edge 1312 that the plane of incidence 1310 and outgoing plane 1330 meet on the light guide plate 1300 and the plane of incidence 1310 and reflecting surface.Like this,, then prevent the marginal portion gathered light, can remove the bright line and the concealed wire that near the plane of incidence 1310, produce effectively if the edge of the plane of incidence 1310 is become the circle processing.

In addition, light guide plate 1300 is from the more little gradually chock shape of the plane of incidence 1310 its thickness far away more.Different therewith, light guide plate 1300 can have certain thickness in whole zone.

Figure 16 is a light guide plate sectional view according to another embodiment of the present invention.

With reference to Figure 16, light guide plate 1400 comprises the plane of incidence 1410 of incident light, the reflecting surface 1420 that extends from one side of the plane of incidence 1410 and the outgoing plane 1430 that extends and face reflecting surface 1420 from other limits of the plane of incidence 1410 according to another embodiment of the present invention.The plane of incidence 1410 forms the right angle with outgoing plane 1430.

Form the prism pattern 1450 that connects a plurality of prisms 1460 continuously on the reflecting surface 1420.Each prism 1460 has the triangulo column shape of extending with perpendicular to the direction of the plane of incidence 1410.

Form the jog 1470 of scattered reflection light on the prism 1460.Jog 1470 is formed into the first place P1 that separates with preset distance from the plane of incidence 1410 always from the plane of incidence 1410.Jog 1470 can form multiple shape for scattered reflection light.For example, jog 1470 has arcuate in shape.

In addition, light guide plate 1400 is from the more little chock shape of the plane of incidence 1410 its thickness far away more.Different therewith, light guide plate 1400 can have certain thickness in whole zone.

With reference to Figure 17, LCD 1000 comprises backlight assembly 100 and display unit 900 according to an embodiment of the invention.

Backlight assembly 100 can have the some structures among a plurality of embodiment shown in Fig. 1 to Figure 16.Therefore, omit the detailed description of its repeating part.

Display unit 900 comprises the display panels 910 of the light display image that utilization provides from backlight assembly 100 and drives the driving circuit portion 920 of display panels 910.

Display panels 910 comprises first substrate 912, faces second substrate 914 of first substrate, 912 joints and gets involved liquid crystal layer (not shown) between first substrate 912 and second substrate 914.

First substrate 912 is substrates that the thin film transistor (TFT) (hereinafter to be referred as TFT) of control element forms with matrix form.An example wherein, first substrate 912 is made up of glass material.The source terminal of above-mentioned TFT and gate terminal are connected with data line and gate line respectively, and drain electrode end is connected with the pixel electrode of being made up of the transparent conductivity material.

Second substrate 914 is to embody the substrate of the rgb pixel of color with film shape formation.A wherein example of second substrate 914 can be made up of glass material.Form the common electrode of forming by the transparent conductivity material at second substrate 914.

Display panels 910 with this structure if apply power supply to connect TFT to the gate terminal of above-mentioned TFT, then forms electric field between pixel electrode and common electrode.Change the Liquid Crystal Molecules Alignment that places the liquid crystal layer between first substrate 912 and second substrate 914 according to this electric field, along with the change of Liquid Crystal Molecules Alignment, the optical transmission that changes from backlight assembly 100 compares to show required image gray.

Driving circuit portion 920 comprises data-signal that drives display panels 910 and the source electrode printed circuit board (PCB) 922 that gate drive signal is provided, connects source electrode printed circuit board (PCB) and the data flexible circuit film 924 of display panels 910 and the grid flexible circuit film 926 that is connected with the gate line of display panels 910.

Data line flexible circuit film 924 and grid flexible circuit film 926 for example carry encapsulation (Tape Carrier Package:TCP) by band or chip contacting thin-film (Chip On Film:COF) is formed.The drive signal that produces from source electrode printed circuit board (PCB) 920 is applied on the data line of display panels 910 by data flexible circuit film 924, and gate drive signal is applied on the gate line of display panels 910 by grid flexible circuit film 926.In order to transmit gate drive signal, on display panels 910, can form the signal routing (not shown) that connects data flexible circuit film 924 and grid flexible circuit film 926.

This backlight assembly and have the LCD of this backlight assembly, the plane of incidence of light guide plate is to the normal of outgoing plane predetermined oblique angle inwards.And it is highly more little near the plane of incidence more for the prism pattern that is formed on the light guide plate reflecting surface, or forming concavo-convexly with plane of incidence adjacent area, or the edge of the plane of incidence is become circle handles.Thereby, remove the bright line and the concealed wire that produce near the plane of incidence, can improve the presentation quality of LCD.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. backlight assembly comprises:

Lamp is used to produce light; And

Light guide plate, comprise the plane of incidence of the light that the described lamp of incident produces, extend and form the reflecting surface of prism pattern from one side of the described plane of incidence and extend from other limits of the described plane of incidence and in the face of the outgoing plane of described reflecting surface, and, the interior angle that the described plane of incidence and described outgoing plane are formed is less than 90 °

Wherein, it is highly more little from the approaching more described plane of incidence in first place that separates with preset distance with the described plane of incidence for described prism.

2. backlight assembly according to claim 1 is characterized in that, the interior angle that the described plane of incidence and described outgoing plane are formed is 89.5 °.

3. backlight assembly according to claim 1 is characterized in that, described prism pattern is made up of interconnective a plurality of prisms, and described prism forms with the direction of extending perpendicular to the described plane of incidence.

4. backlight assembly according to claim 3 is characterized in that, it is highly more little for the approaching more described plane of incidence of described prism.

5. backlight assembly according to claim 3 is characterized in that, described prism forms concavo-convex from the described plane of incidence up to described first place.

6. backlight assembly according to claim 3 is characterized in that, the distance between the described plane of incidence and described first place is 20mm-60mm.

7. backlight assembly according to claim 1 is characterized in that, second edge that first edge that the described plane of incidence and the described outgoing plane of described light guide plate met and the described plane of incidence and described reflecting surface meet becomes circle to be handled.

8. backlight assembly according to claim 1 is characterized in that, described light guide plate is more little from the described plane of incidence its thickness far away more.

9. backlight assembly according to claim 1 is characterized in that, further comprises:

Reflection sheet places described reflecting surface bottom; And

Otpical leaf places described outgoing plane top.

10. backlight assembly according to claim 1 is characterized in that described otpical leaf comprises the reversed prism thin slice, and wherein, the prism pattern that is formed at described reversed prism thin slice is to form perpendicular to the direction that is formed on the prism pattern on the light guide plate.

11. a backlight assembly is characterized in that, comprising:

Lamp is used to produce light; And

Wherein said prism pattern is made up of a plurality of prisms connected to one another, it is highly more little from the approaching more described plane of incidence in first place that separates with preset distance with the described plane of incidence for described each prism, and described prism forms concavo-convex from the described plane of incidence of described light guide plate to described first place on the described prism.

12. a backlight assembly comprises:

Lamp is used to produce light; And

Light guide plate, comprise the light that the described lamp of incident produces the plane of incidence, extend from one side of the described plane of incidence, and form the reflecting surface of prism pattern and extend from other limits of the described plane of incidence and in the face of the outgoing plane of described reflecting surface,

Wherein said prism pattern is made up of a plurality of prisms connected to one another, and it is highly more little for the approaching more described plane of incidence of described prism,

Wherein, it is highly more little from the approaching more described plane of incidence in first place that separates with preset distance with the described plane of incidence for described each prism.

13. backlight assembly according to claim 12 is characterized in that, described prism forms with the length direction perpendicular to described prism.

14. backlight assembly according to claim 12 is characterized in that, described prism forms concavo-convex from the described plane of incidence to described first place.

15. backlight assembly according to claim 12 is characterized in that, second edge that first edge that the described plane of incidence and the described outgoing plane of described light guide plate met and the described plane of incidence and described reflecting surface meet becomes circle to be handled.

16. a backlight assembly comprises:

Lamp is used to produce light; And

Light guide plate comprises that the reflecting surface of prism pattern is extended and forms in incident from the plane of incidence of the light of described lamp, from one side of the described plane of incidence and extends from other limits of the described plane of incidence and in the face of the outgoing plane of described reflecting surface,

Wherein said prism pattern is by interconnecting and form with a plurality of prisms that the length direction perpendicular to described prism forms, and forms concavo-convex with the described plane of incidence with first place that preset distance separates at described prism on from the described plane of incidence to described prism.

17. a LCD comprises:

Backlight assembly, comprise the plane of incidence of the light that the described lamp of the lamp, the incident that are used to produce light produces, extend and form the reflecting surface of prism pattern from one side of the described plane of incidence and extend from other limits of the described plane of incidence and in the face of the outgoing plane of described reflecting surface, the interior angle that the described plane of incidence and described outgoing plane are formed is less than 90 °; And

Display panels, the light display image that utilizes described backlight assembly to provide,

18. LCD according to claim 17 is characterized in that, the interior angle that the described plane of incidence and described outgoing plane are formed is 89.5 °.

19. LCD according to claim 17 is characterized in that, described prism pattern is made up of a plurality of prisms connected to one another, and described prism forms with the direction of extending perpendicular to the described plane of incidence.

20. LCD according to claim 19 is characterized in that, described prism forms concavo-convex from the described plane of incidence to described first place.

21. LCD according to claim 17 is characterized in that, second edge that first edge that the described plane of incidence and the described outgoing plane of described light guide plate met and the described plane of incidence and described reflecting surface meet becomes circle to be handled.

22. LCD according to claim 17 is characterized in that, described light guide plate is thin more from the described plane of incidence its thickness far away more.

23. LCD according to claim 22 is characterized in that, the described outgoing plane of described light guide plate is parallel with the bottom surface of described display panels.

24. LCD according to claim 17 is characterized in that, described backlight assembly further comprises:

Reflection sheet places described reflecting surface bottom; And

The reversed prism thin slice places described outgoing plane top,

Wherein, be formed at the prism pattern of described reversed prism thin slice to form perpendicular to the direction that is formed on the prism pattern on the light guide plate.

25. a LCD comprises:

Backlight assembly, comprise the lamp and the light guide plate that are used to produce light, described light guide plate has the plane of incidence of the light that the described lamp of incident produces, extend and form the reflecting surface of prism pattern from one side of the described plane of incidence and extend from other limits of the described plane of incidence and in the face of the outgoing plane of described reflecting surface; And

Wherein said prism is made up of a plurality of prisms connected to one another, and it is highly more little for the approaching more described plane of incidence of described prism,

26. LCD according to claim 25 is characterized in that, second edge that first edge that the described plane of incidence and the described outgoing plane of described light guide plate met and the described plane of incidence and described reflecting surface meet becomes circle to be handled.

27. LCD according to claim 25 is characterized in that, described prism forms concavo-convex with the described plane of incidence with described first place that preset distance separates from the described plane of incidence of described light guide plate to described prism.