CN101761829B - Backlight module and display device using same - Google Patents
Backlight module and display device using same Download PDFInfo
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- CN101761829B CN101761829B CN2010100037629A CN201010003762A CN101761829B CN 101761829 B CN101761829 B CN 101761829B CN 2010100037629 A CN2010100037629 A CN 2010100037629A CN 201010003762 A CN201010003762 A CN 201010003762A CN 101761829 B CN101761829 B CN 101761829B
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- light
- leaded light
- light guide
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Abstract
The invention discloses a display device which comprises a backlight module and a display panel arranged above the backlight module. The backlight module comprises a light guide plate and a plurality of sets of light sources, wherein the light guide plate is provided with a light incident surface arranged on a first light guide part and a light emergent surface arranged on a second light guide part, and the light incident surface and the light emergent surface are adjacent mutually; the first light guide part is provided with first light guide cavities and second light guide cavities which are alternately arrayed; the first light guide cavity is provided with a first light guide wall and a second light guide wall which extend towards the light incident surface and intersect at a first vertex angle, and the second light guide cavity is provided with a third light guide wall and a fourth light guide wall which extend away from the light incident surface and intersect at a second vertex angle; and the light sources comprise first light emitting diodes and second light emitting diodes which are arranged next to the light incident surface of the light guide plate and respectively correspond to the first light guide wall and the second light guide wall.
Description
Technical field
The present invention relates to a kind of backlight module, particularly relate to a kind of emitting uniform backlight module and use the display device of this backlight module.
Background technology
Backlight module is in order to display panels (liquid crystal display panel, LCDpanel) required display light source to be provided.Backlight module can be divided into straight-down negative and side incident type according to the light inlet mode, and wherein the backlight module of side incident type uses light guide plate usually (light guide plate, LGP) light that light source is provided converts area source to.On the other hand, because light emitting diode (light emitting diode, LED) have high brightness, characteristic that volume is little, therefore be applied in the backlight module gradually at present, so that LCD can develop towards light, thin target with high brightness further.
Fig. 1 is the local schematic top plan view of existing side incident type backlight module.Please refer to Fig. 1, backlight module 100 comprises a plurality of light emitting diodes 110 and light guide plate (light guide plate, LGP) 120.Wherein, these light emitting diodes 110 are incidence surface 122 sides that are arranged in light guide plate 120 at each interval, in order to launch light to light guide plate 120 inside.Because the rising angle of light emitting diode 110 is limited, therefore when the spacing d between the adjacent light emitting diode 110 is too big, often have tangible blanking bar district B, the uneven problem of bright dipping just by the light of 120 outgoing of light guide plate.One of method of existing head it off is the spacing d that shortens between these light emitting diodes 110.Yet under the prerequisite of backlight module 100 size constancies, the spacing d as between the desire shortening light emitting diode 110 need use more light emitting diode 110, causes the cost of backlight module 100 to improve.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of backlight module, it can provide uniform surface light source under the prerequisite that does not raise the cost.
A further object of the present invention is to provide a kind of display device, and it comprises the backlight module that uniform area light source can be provided, thereby can have good demonstration usefulness.
For reaching above-mentioned purpose, the present invention proposes a kind of backlight module, comprises light guide plate and multiple sets of light sources, and wherein light guide plate has incidence surface adjacent one another are and exiting surface, and comprises first light guide section and second light guide section.This incidence surface is to be positioned at first light guide section, and exiting surface then is to be positioned at second light guide section.And first light guide section has a plurality of first leaded light chambeies and a plurality of second leaded light chamber, and wherein these first leaded light chambeies and these second leaded light chambeies are staggered.Each first leaded light chamber has the first leaded light wall and the second leaded light wall, and the first leaded light wall and the second leaded light wall are to intersect at first drift angle towards the incidence surface extension.Each second leaded light chamber then has the 3rd leaded light wall and the 4th leaded light wall, and the 3rd leaded light wall and the 4th leaded light wall are to intersect at second drift angle away from the incidence surface extension.On the other hand, the first leaded light wall is adjacent with the 4th leaded light wall, and the second leaded light wall is then adjacent with the 3rd leaded light wall.
Hold above-mentionedly, these light sources are to be configured in by the incidence surface of light guide plate, and correspond to above-mentioned these first leaded light chambeies, are suitable for providing light to light guide plate inside.And each is organized light source and comprises first light emitting diode that corresponds to the first leaded light wall and second light emitting diode that corresponds to the second leaded light wall.
The present invention also proposes a kind of display device, the display panel that comprises above-mentioned backlight module and be configured in the exiting surface top of light guide plate.
In one embodiment of this invention, above-mentioned first drift angle is identical with the angle of second drift angle.
In one embodiment of this invention, above-mentioned light guide plate is formed in one.
In one embodiment of this invention, above-mentioned light guide plate is assembled by first light guide section and second light guide section.
In one embodiment of this invention, above-mentioned backlight module more comprises a plurality of reflector plates, be disposed at by the incidence surface of light guide plate, and between each group light source.
In one embodiment of this invention, above-mentioned first light guide section has more a plurality of smooth reflection graphic patterns, corresponds between these light sources and is distributed in incidence surface.
In one embodiment of this invention, above-mentioned these first leaded light chamber width on the direction of parallel incidence surface greater than its correspondence should the group light source width.
In one embodiment of this invention, the angle of above-mentioned first drift angle is between 50～120 degree.
In one embodiment of this invention, the angle of above-mentioned second drift angle is between 50～120 degree.
In one embodiment of this invention, above-mentioned backlight module more comprises at least one blooming piece, and for example diffusion sheet, brightening piece, prismatic lens or its combination are disposed on the exiting surface of light guide plate.
In one embodiment of this invention, above-mentioned backlight module more comprises reflex housing, coats above-mentioned these light sources and first light guide section.
In one embodiment of this invention, the above-mentioned first leaded light wall is parallel to the 4th leaded light wall, and the second leaded light wall is parallel to the 3rd leaded light wall.
In one embodiment of this invention, above-mentioned each first drift angle and its spacing between adjacent second drift angle between 5 centimetres to 25 centimetres.
In one embodiment of this invention, above-mentioned each first leaded light chamber with its distance between the adjacent second leaded light chamber equate.
In one embodiment of this invention, above-mentioned display panel comprises display panels.
Backlight module of the present invention forms a plurality of first leaded light chambeies and a plurality of second leaded light chamber of arrangement interlaced with each other in light guide plate, it is advanced the part light refraction that light source was sent to second light guide section by the first leaded light chamber, and with part light total reflection to the second leaded light chamber, advance to second light guide section by the second leaded light cavity reflection light again, so that it is from the exiting surface outgoing of light guide plate.Thus, can avoid not producing tangible blanking bar disposing the light source place, and improve the light-emitting uniformity of backlight module, and then improve the demonstration usefulness of the display device of using it.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the schematic top plan view of existing side incident type backlight module;
Fig. 2 is the diagrammatic cross-section of display device in one embodiment of the invention;
Fig. 3 is the backlight module schematic top plan view of Fig. 2;
Fig. 4 is the local schematic top plan view of backlight module in the another embodiment of the present invention;
Fig. 5 is the local schematic top plan view of backlight module in the another embodiment of the present invention;
Fig. 6 is the local schematic top plan view of backlight module in the another embodiment of the present invention.
The main element symbol description
100,300,400: backlight module
110: light emitting diode
120,310: light guide plate
122,312: incidence surface
200: display device
210: display panel
220: blooming piece
310a: first light guide section
310b: second light guide section
311: the first leaded light chambeies
311a: the first leaded light wall
311b: the second leaded light wall
313: the second leaded light chambeies
313a: the 3rd leaded light wall
313b: the 4th leaded light wall
314: exiting surface
320: light source
322: the first light emitting diodes
324: the second light emitting diodes
330: reflex housing
410: reflector plate
420: circuit board
610: the light reflection graphic patterns
B: blanking bar district
D, d: spacing
H
1, H
2: width
L
1, L
2: light
1: the first drift angle of θ
2: the second drift angles of θ
Embodiment
Below will lift display device is the application that example illustrates backlight module of the present invention, but the present invention is not as limit.
Fig. 2 is the diagrammatic cross-section of display device in one embodiment of the invention, and Fig. 3 then is the backlight module schematic top plan view of Fig. 2.Please refer to Fig. 2 and Fig. 3, display device 200 comprises backlight module 300 and display panel 210, wherein backlight module 300 comprises light guide plate 310 and multiple sets of light sources 320, and light guide plate 310 has light inlet row face adjacent one another are 312 and exiting surface 314, and display panel 210 promptly is exiting surface 314 tops that are configured in light guide plate 310.Specifically, display panel 210 for example is display panels (Liquid Crystal Display panel, LCD panel) or other non-self luminous display panels.In addition, can also dispose at least one blooming piece 220 between light guide plate 310 and the display panel 210, as diffusion sheet, brightening piece, prismatic lens or its combination.
Please continue with reference to Fig. 3, light guide plate 310 comprises the first light guide section 310a and the second light guide section 310b.Wherein, incidence surface 312 is to belong to the first light guide section 310a, and 314 of exiting surfaces are to belong to the second light guide section 310b.What deserves to be mentioned is that the first light guide section 310a and the second light guide section 310b of present embodiment are formed in one, but the invention is not restricted to this.In other embodiments, the first light guide section 310a and the second light guide section 310b also can be the independent sheet material that is assembled in each other.For instance, the second light guide section 310b can be general common wedge type light guide plate, and the first light guide section 310a is configured in the other sheet material of wedge type light guide plate separately.
Hold above-mentionedly, the first light guide section 310a has a plurality of first leaded light chambeies 311 and a plurality of second leaded light chambeies 313, and wherein these first leaded light chambeies 311 are staggered with these second leaded light chambeies 313.That is to say that each first leaded light chamber 311 lays respectively between two the second leaded light chambeies 313.And, each first leaded light chamber 311 of present embodiment with its distance between adjacent two the second leaded light chambeies 313 equate.Each first leaded light chamber 311 has the first leaded light wall 311a and the second leaded light wall 311b, and the first leaded light wall 311a and the second leaded light wall 311b intersect at first vertex angle theta towards incidence surface 312 extensions
1Each 313 in second leaded light chamber has the 3rd leaded light wall 313a and the 4th leaded light wall 313b, and the 3rd leaded light wall 313a and the 4th leaded light wall 313b intersect at second vertex angle theta away from incidence surface 312 extensions
2And the first leaded light wall 311a is adjacent with the 4th leaded light wall 313b, and the second leaded light wall 311b is then adjacent with the 3rd leaded light wall 313a.In the present embodiment, first vertex angle theta
1With its adjacent second vertex angle theta
2Between space D for example be between 5 centimetres to 25 centimetres
It should be noted that the ray refractive index of the ray refractive index in the first leaded light chamber 311 and the second leaded light chamber 313 less than first other positions of light guide section 310a.Specifically, it for example is air that the light of the first leaded light chamber 311 and 313 inside, the second leaded light chamber transmits medium, and the material of the first light guide section 310a for example be polymethylmethacrylate (polymethyl methacrylate, PMMA), its refractive index is about 1.49, but is not limited thereto.
Please continue with reference to Fig. 2 and Fig. 3, each organizes light source 320 is incidence surface 312 sides that are configured in light guide plate 310 at each interval, and corresponds to the first leaded light chamber 311, in order to provide light to light guide plate 310 inside.And each is organized light source 320 and comprises first light emitting diode 322 and second light emitting diode 324 that corresponds to the second leaded light wall 311b that corresponds to the first leaded light wall 311a respectively.
Specifically, the first leaded light chamber 311 of present embodiment and second projection of leaded light chamber 313 on exiting surface 314 are triangular in shape.And, the width H of the first leaded light chamber 311 on the direction of parallel incidence surface 312
1For example be greater than its width H of light source 320 of correspondence
2That is to say that most light that first light emitting diode 322 is sent all can be incident upon the first leaded light wall 311a, and most light that second light emitting diode 324 is sent all can be incident upon the second leaded light wall 311b.
In addition, first vertex angle theta in the first leaded light chamber 311
1Second vertex angle theta with the second leaded light chamber 313
2For example be between 120 degree between 50 degree.And, each first leaded light wall 311a be parallel to its adjacent the 4th leaded light wall 313b, each second leaded light wall 311b then be parallel to its adjacent the 3rd leaded light wall 313a.In other words, first vertex angle theta in the first leaded light chamber 311 of present embodiment
1Second vertex angle theta with the second leaded light chamber 313
2Equate.
Please refer to Fig. 3, the light L that first light emitting diode 322 is sent
1After being incident upon the first leaded light wall 311a in the first leaded light chamber 311, part can reflect and advance toward light guide plate 310 inside, promptly advance toward the second light guide section 310b, part then can total reflection to the 4th leaded light wall 313b in the second adjacent leaded light chamber 313, produce total reflection and advance toward light guide plate 310 inside (the promptly past second light guide section 310b advances) in the 4th leaded light wall 313b again, afterwards from exiting surface 314 outgoing of light guide plate 310.On the other hand, the light L that sent of second light emitting diode 324
2Then after being incident upon the second leaded light wall 311b in the first leaded light chamber 311, part can reflect and advance toward light guide plate 310 inside, promptly advance toward the second light guide section 310b, part then can total reflection to the 3rd leaded light wall 313a in the second adjacent leaded light chamber 313, produce total reflection and advance toward light guide plate 310 inside (the promptly past second light guide section 310b advances) in the 3rd leaded light wall 313a again, afterwards from exiting surface 314 outgoing of light guide plate 310.
From the above, the light portion that the first leaded light chamber 311 and the second leaded light chamber 313 can make light source 320 be sent directly imports in light guide plate 310 through the first leaded light chamber 311, part is access between then in the light guide plate 310 and imports, promptly earlier light is directed at the second leaded light chamber 313 and in light guide plate 310, imports again, so can avoid light guide plate 310 to form blanking bar in the position that does not correspond to light source 320.In other words, backlight module 300 of the present invention can provide uniform surface light source.
Please referring again to Fig. 2, for improving light utilization efficiency, backlight module 300 can also include reflex housing 330, and it is the first light guide section 310a that envelopes light source 320 and light guide plate 310, so that the light that light source 320 is sent can both be incident to light guide plate 310 inside by incidence surface 312 greatly.In addition, in another embodiment of the present invention, as shown in Figure 4, backlight module 400 can also include a plurality of reflector plates 410, and the incidence surface 312 that is configured in light guide plate 310 is other, and between adjacent in twos light source 320.Thus, if the light L that first light emitting diode is sent
1Advance towards the incidence surface 312 of light guide plate 310 through first leaded light wall 311a reflection back, then can pass through reflector plate 410 light L
1The light utilization efficiency of reflected back light guide plate 310 inside, and then raising once more.In like manner, the light L that sent of second light emitting diode
2After second leaded light wall 311b reflection, also can pass through reflector plate 410 again with light L
2Reflected back light guide plate 310 inside once more.
Specifically, these reflector plates 410 except can be as shown in Figure 4 general configuration on the part incidence surface 312 of light guide plate 310 and be positioned at 320 of adjacent light sources, also can be to be configured on the circuit board 420 that electrically connects with light source 320, as shown in Figure 5, wherein, the mode of configuration reflector plate 410 for example is the mode with plated film or stickup.The present invention is not subject to the limits to be decided reflector plate 410 and where is formed at, as long as it is to correspond between the adjacent light source 320 to reach the effect identical with previous embodiment.
In another embodiment, also can form a plurality of smooth reflection graphic patterns 610 on the part incidence surface 312 of light guide plate 310, as shown in Figure 6, and these reflection graphic patterns 610 are to correspond between the two adjacent light sources 320, in order to will be by the light L of first leaded light wall 311a reflection
1And by the light L of second leaded light wall 311b reflection
2Reflected back light guide plate 310 inside once more.
In sum, backlight module of the present invention forms a plurality of first leaded light chambeies and a plurality of second leaded light chamber of arrangement interlaced with each other in light guide plate, and wherein light source is the configuration of the corresponding first leaded light chamber.In other words, the second leaded light chamber is the gap that corresponds between the adjacent light source, and just the second leaded light chamber is positioned at the position that light guide plate does not correspond to light source.The light that light source sent is except advancing and from the exiting surface outgoing of light guide plate to second light guide section via the first leaded light chamber, can also pass through first leaded light chamber total reflection to the second leaded light chamber, advancing to second light guide section by the second leaded light cavity reflection light makes its exiting surface outgoing from light guide plate again.Hence one can see that, and backlight module of the present invention can diffuse to the light that light source sent and not dispose the light source part, and with the raising light-emitting uniformity, and then the demonstration usefulness of its display device is used in improvement.
Though the present invention has disclosed the present invention in conjunction with above preferred embodiment; yet it is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, thus protection scope of the present invention should with enclose claim was defined is as the criterion.
Claims (13)
1. backlight module comprises:
Light guide plate, have incidence surface adjacent one another are and exiting surface, and comprise first light guide section and second light guide section, wherein this incidence surface is positioned at this first light guide section, this exiting surface is positioned at this second light guide section, and this first light guide section has a plurality of first leaded light chambeies and a plurality of second leaded light chamber, those first leaded light chambeies and those second leaded light chambeies are staggered, respectively this first leaded light chamber has the first leaded light wall and the second leaded light wall, and this first leaded light wall and this second leaded light wall intersect at first drift angle towards this incidence surface extension, respectively this second leaded light chamber has the 3rd leaded light wall and the 4th leaded light wall, and the 3rd leaded light wall and the 4th leaded light wall intersect at second drift angle away from this incidence surface extends, this first leaded light wall is adjacent with the 4th leaded light wall, and this second leaded light wall is adjacent with the 3rd leaded light wall;
Multiple sets of light sources is disposed at by this incidence surface of this light guide plate, and corresponds to those first leaded light chambeies, is suitable for providing a light to this light guide plate inside, and respectively this group light source comprises:
First light emitting diode corresponds to this first leaded light wall; And
Second light emitting diode corresponds to this second leaded light wall, and
Wherein, this first drift angle is identical with the angle of this second drift angle, and those first leaded light chamber width on the direction of parallel this incidence surface are greater than its pairing width that should organize light source.
2. backlight module as claimed in claim 1, wherein this first light guide section and this second light guide section are formed in one.
3. backlight module as claimed in claim 1, wherein this light guide plate is assembled by this first light guide section and this second light guide section.
4. backlight module as claimed in claim 1 also comprises a plurality of reflector plates, is disposed at by this incidence surface of this light guide plate, and respectively should organizing between the light source.
5. backlight module as claimed in claim 1, wherein this first light guide section also has a plurality of smooth reflection graphic patterns, corresponds between those light sources and is distributed in this incidence surface.
6. backlight module as claimed in claim 1, wherein the angle of this first drift angle is between 50～120 degree.
7. backlight module as claimed in claim 1, wherein the angle of this second drift angle is between 50～120 degree.
8. backlight module as claimed in claim 1 also comprises at least one blooming piece, is disposed on this exiting surface of this light guide plate.
9. backlight module as claimed in claim 1 also comprises reflex housing, and it coats those light sources and this first light guide section.
10. backlight module as claimed in claim 1, wherein this first leaded light wall is parallel to the 4th leaded light wall, and this second leaded light wall is parallel to the 3rd leaded light wall.
11. backlight module as claimed in claim 1, wherein respectively this first drift angle and its spacing between adjacent this second drift angle between 5 centimetres to 25 centimetres.
12. backlight module as claimed in claim 1, wherein respectively this first leaded light chamber with its spacing between adjacent those second leaded light chambeies equate.
13. a display device comprises:
Backlight module comprises:
Light guide plate, have incidence surface adjacent one another are and exiting surface, and comprise first light guide section and second light guide section, wherein this incidence surface is positioned at this first light guide section, this exiting surface is positioned at this second light guide section, and this first light guide section has a plurality of first leaded light chambeies and a plurality of second leaded light chamber, those first leaded light chambeies and those second leaded light chambeies are staggered, respectively this first leaded light chamber has the first leaded light wall and the second leaded light wall, and this first leaded light wall and this second leaded light wall intersect at one first drift angle towards this incidence surface extension, respectively this second leaded light chamber has the 3rd leaded light wall and the 4th leaded light wall, and the 3rd leaded light wall and the 4th leaded light wall intersect at one second drift angle away from this incidence surface extends, this first leaded light wall is adjacent with the 4th leaded light wall, and this second leaded light wall is adjacent with the 3rd leaded light wall;
Multiple sets of light sources is disposed at by this incidence surface of this light guide plate, and corresponds to those first leaded light chambeies, is suitable for providing a light to this light guide plate inside, and respectively this group light source comprises:
First light emitting diode corresponds to this first leaded light wall;
Second light emitting diode corresponds to this second leaded light wall; And
Display panel is disposed at above this exiting surface of this light guide plate, and
Wherein, this first drift angle is identical with the angle of this second drift angle, and those first leaded light chamber width on the direction of parallel this incidence surface are greater than its pairing width that should organize light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100037629A CN101761829B (en) | 2010-01-18 | 2010-01-18 | Backlight module and display device using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100037629A CN101761829B (en) | 2010-01-18 | 2010-01-18 | Backlight module and display device using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101761829A CN101761829A (en) | 2010-06-30 |
| CN101761829B true CN101761829B (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100037629A Expired - Fee Related CN101761829B (en) | 2010-01-18 | 2010-01-18 | Backlight module and display device using same |
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| CN (1) | CN101761829B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444832A (en) * | 2010-10-08 | 2012-05-09 | 华硕电脑股份有限公司 | Backlight module and display device using same and electronic device using the backlight module |
| CN102620209A (en) * | 2012-03-29 | 2012-08-01 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN102661527B (en) * | 2012-03-29 | 2014-03-26 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN102840520B (en) * | 2012-09-14 | 2015-05-27 | 京东方科技集团股份有限公司 | Sidelight type backlight module and display device |
| FR3062486B1 (en) * | 2017-01-30 | 2019-04-19 | Valeo Comfort And Driving Assistance | LIGHT GUIDE AND OPTICAL ASSEMBLY COMPRISING SUCH A LIGHT GUIDE |
| CN114829997B (en) * | 2020-09-21 | 2023-12-12 | 京东方科技集团股份有限公司 | Light guide structure, light source module and display module |
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| CN101761829A (en) | 2010-06-30 |
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