CN102818196B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN102818196B CN102818196B CN201210306030.6A CN201210306030A CN102818196B CN 102818196 B CN102818196 B CN 102818196B CN 201210306030 A CN201210306030 A CN 201210306030A CN 102818196 B CN102818196 B CN 102818196B
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- guide plate
- light guide
- optical resin
- backlight module
- incidence
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Abstract
The invention relates to the technical field of display and displays a backlight module. The backlight module comprises a light emitting body and a light guiding plate, wherein the light emitting body consists of a plurality of LEDs (Light Emitting Diodes), the light guiding plate comprises a light guiding plate substrate, the substrate comprises an incident plane used for receiving light beams, the light emitting body is arranged at the side part of the incident plane, optical resin patterns are formed on the incident plane, a graph region is positioned between any two adjacent LEDs, and the refractive index of the optical resin patterns is not equal to that of the light guiding plate substrate. The invention also discloses a display device. The optical resin patterns positioned between any two adjacent LEDs is formed on the incident plane of the light guiding plate substrate, so that light emitted by the LEDs are refracted by two times through the optical resin patterns and the light guiding plate, the path of the light emitted by the LEDs is changed, the light scattering angle is enlarged, the range of a dark region is reduced and even eliminated, the alternation of the brightness and the darkness on the light guiding plate is improved effectively, and the display quality of the display device is improved.
Description
Technical field
The present invention relates to Display Technique field, particularly relate to a kind of backlight module and display unit.
Background technology
Existing backlight module, mainly contain side entering type and straight-down negative two kinds of polishing modes, select LED as the backlight module of light source for side entering type polishing, its light guide plate schematic diagram as shown in Figure 1, between LED2 and light guide plate 1, there is certain distance, be subject to the restriction of LED2 lighting angle, LED2 lighting angle is generally 120 degree.Because gap between LED2 and light guide plate 1 can not be too large, so the dark space 3 between adjacent LED2 as shown in Figure 1 often can be there is, make light guide plate 1 to occur the bright phenomenon secretly replaced, be referred to as focus, affect the display quality of display unit.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention how to improve the bright phenomenon secretly replaced that light guide plate occurs.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of backlight module, it comprises illuminator and light guide plate, described illuminator is made up of multiple LED, described light guide plate comprises light guide plate base and is formed in the plane of incidence in order to receiving beam in described light guide plate base, described illuminator is arranged on described plane of incidence sidepiece, the described plane of incidence is formed with optical resin pattern, the graphics field of described optical resin pattern between two LED of arbitrary neighborhood, the refractive index of described optical resin pattern and the refractive index of described light guide plate base unequal.
Wherein, the thickness of described optical resin pattern is greater than the distance between described LED and the described light guide plate plane of incidence.
Wherein, the refractive index of the optical resin material selected by described optical resin pattern is 1.3 ~ 1.8.
Wherein, the refractive index of the optical resin material selected by optical resin pattern is greater than the refractive index of described light guide plate base.
Wherein, described optical resin material is the one in this acid propylene of carbon acetic acid, Merlon, polystyrene, borosilicate or polytetrafluoroethylene (PTFE).
Wherein, described light guide plate also comprises and to be formed in described light guide plate base and with the bottom surface that the described plane of incidence is connected, be connected and the exit facet relative with bottom surface with the plane of incidence.
Wherein, the described plane of incidence is at least one side described light guide plate base connected in the side of bottom surface and exit facet.
Wherein, described light guide plate also comprises and to be formed in described light guide plate base and with the side that the described plane of incidence is connected, be connected and the exit facet relative with the described plane of incidence with side.
Present invention also offers a kind of display unit, it comprises the backlight module described in above-mentioned any one.
(3) beneficial effect
The backlight module that technique scheme provides and corresponding display unit, by forming the optical resin pattern between arbitrary neighborhood LED on the light guide plate base plane of incidence, twice refraction is there is in the light that LED is sent through optical resin pattern and light guide plate, the opticpath that LED sends changes, expand divergence of beam angle, the scope of dark space reduces to eliminate even completely, effectively improves the bright phenomenon secretly replaced that light guide plate occurs, improves the display quality of display unit.
Accompanying drawing explanation
Fig. 1 is the guide-lighting schematic diagram of backlight module in prior art;
Fig. 2 is the partial structurtes schematic diagram of the backlight module of the embodiment of the present invention 1;
Fig. 3 is the guide-lighting schematic diagram of the backlight module of the embodiment of the present invention 1.
Wherein, 1: light guide plate; 2:LED; 3: dark space; 4: optical resin pattern.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Fig. 2 shows the partial structurtes schematic diagram of the backlight module of the present embodiment, with reference to diagram, this backlight module comprises illuminator and light guide plate 1, described illuminator is made up of multiple LED2, described light guide plate 1 comprises light guide plate base and is formed in the plane of incidence in order to receiving beam in described light guide plate base, described illuminator is arranged on described plane of incidence sidepiece, the described plane of incidence is formed with optical resin pattern 4, the graphics field of described optical resin pattern 4 is between two LED2 of arbitrary neighborhood, the refractive index of described optical resin pattern 4 and the refractive index of described light guide plate base unequal.Fig. 3 shows the guide-lighting schematic diagram of the present embodiment backlight module, the light that vibrational power flow shown in Fig. 2 can make LED2 send first enters optical resin pattern 4 by air, there is a light refraction, then light guide plate 1 is entered by optical resin pattern 4, because of the refractive index of optical resin pattern 4 and the light guide plate base refractive index of light guide plate 1 unequal, so there is again second time refraction, after twice refraction, the opticpath that LED2 sends changes, expand divergence of beam angle, the scope of dark space reduces to eliminate even completely, thus improves hot spot phenomenon.
Wherein, the thickness of optical resin pattern 4 is greater than the distance between LED2 and light guide plate 1, and fully can ensure that the light that LED2 sends enters optical resin pattern 4 by side, based on the effect of Fresnel law, namely light path can change.
Effectively expand to make the divergence of beam angle of LED2, the material that the material selection refractive index of optical resin pattern 4 is high, preferably between 1.3 ~ 1.8, and the refractive index of optical resin pattern is greater than the refractive index of described light guide plate base, any one in the materials such as this acid propylene of carbon acetic acid, Merlon, polystyrene, borosilicate or polytetrafluoroethylene (PTFE) specifically can be selected.
For in Fig. 3, the light sent by LED2 is with incidence angle i directive optical resin pattern, and first time refraction occurs light, and refraction angle is α, and refracted ray, again by optical resin pattern 4 directive light guide plate 1, second time refraction occurs; The incidence angle of refraction is β, β and α complementary angle each other for the second time, and the refraction angle of second time refraction is γ, according to the detailed description in figure, in the effect ensureing to expand divergence of beam angle after twice refraction, the scope of reduction dark space is even eliminated, and at least demand fulfillment
the refractive index of note air is n
0, the refractive index of optical resin pattern is n
1, the refractive index of light guide plate is n
2, obvious n
0<n
1, in order to make above-mentioned divergence of beam angle effectively expand, preferred n
2<n
1, the material because of light guide plate base is generally lucite class, its refractive index n
2between 1.3-1.6, the refractive index n of optical resin pattern
1select between 1.3-1.8, can n be met
1with n
0and n
2can not deviation too large, if n
1numerical value is too large, then refraction angle α is too small, and β is excessive, and the excessive caused final radiation direction by light guide plate 1 outgoing of further γ departs from too greatly with expection, affects the homogeneity of backlight module distribution of light; If n
1numerical value is too little, then refraction angle α and incidence angle i is too close, and divergence of beam angle can not effectively expand, and dark space problem can not effectively solve.
The present embodiment is by n
1select between 1.3-1.8, and n
2<n
1the index path of light is identical with Fig. 3, and light is through twice refraction, and divergence of beam angle can both expand by each refraction to a certain extent, thus make the scope of dark space in light guide plate reduce or eliminate completely, significantly improve the brightness of backlight module and the homogeneity of light.
The back light module unit structure that the present embodiment provides, is applicable to the backlight module of side-light type, is also applicable to the backlight module of straight-down negative.
When this backlight module is side-light type, described light guide plate also comprises and to be formed in described light guide plate base and with the bottom surface that the described plane of incidence is connected, be connected and the exit facet relative with bottom surface with the plane of incidence.Wherein, the described plane of incidence is at least one side in the connection bottom surface of described light guide plate base and the side of exit facet.The light entered by the described plane of incidence, after described bottom reflection, is penetrated by described exit facet.
When this backlight module is straight-down negative, described light guide plate base also comprises with the side that the described plane of incidence is connected, is connected and the exit facet relative with the described plane of incidence with side.The light entered by the described plane of incidence, is directly penetrated by exit facet.
The backlight module that the present embodiment provides, because the scope of dark space in light guide plate reduces or eliminates completely, can significantly improve the brightness of backlight module and the homogeneity of light.
Embodiment 2
Present embodiments provide a kind of display unit, it is arranged based on the backlight module in embodiment 1, display floater and backlight module is assembled, form display unit, because backlight module brightness is high, occur in backlight module that the probability of bright concealed wire is very low, thus improve the display quality of display unit.
As can be seen from the above embodiments, the optical resin pattern of the present invention by being formed on the light guide plate base plane of incidence between arbitrary neighborhood LED, twice refraction is there is in the light that LED is sent through optical resin pattern and light guide plate, the opticpath that LED sends changes, expand divergence of beam angle, the scope of dark space reduces even to eliminate, and effectively improves the bright phenomenon secretly replaced that light guide plate occurs, improves the display quality of display unit.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (7)
1. a backlight module, it is characterized in that, comprise illuminator and light guide plate, described illuminator is made up of multiple LED, described light guide plate comprises light guide plate base and is formed in the plane of incidence in order to receiving beam in described light guide plate base, described illuminator is arranged on described plane of incidence sidepiece, the described plane of incidence is formed with optical resin pattern, the graphics field of described optical resin pattern between two LED of arbitrary neighborhood, the refractive index of described optical resin pattern and the refractive index of described light guide plate base unequal; The thickness of described optical resin pattern is greater than the distance between described LED and the described light guide plate plane of incidence;
Wherein, the refractive index of the optical resin material selected by optical resin pattern is greater than the refractive index of described light guide plate base.
2. backlight module as claimed in claim 1, it is characterized in that, the refractive index of the optical resin material selected by described optical resin pattern is 1.3 ~ 1.8.
3. backlight module as claimed in claim 2, it is characterized in that, described optical resin material is the one in this acid propylene of carbon acetic acid, Merlon, polystyrene, borosilicate or polytetrafluoroethylene (PTFE).
4. backlight module as claimed in claim 1, is characterized in that, described light guide plate also comprises and to be formed in described light guide plate base and with the bottom surface that the described plane of incidence is connected, be connected and the exit facet relative with bottom surface with the plane of incidence.
5. backlight module as claimed in claim 4, it is characterized in that, the described plane of incidence is at least one side described light guide plate base connected in the side of bottom surface and exit facet.
6. backlight module as claimed in claim 1, is characterized in that, described light guide plate also comprises and to be formed in described light guide plate base and with the side that the described plane of incidence is connected, be connected and the exit facet relative with the described plane of incidence with side.
7. display unit, is characterized in that, comprises the backlight module according to any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306030.6A CN102818196B (en) | 2012-08-24 | 2012-08-24 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306030.6A CN102818196B (en) | 2012-08-24 | 2012-08-24 | Backlight module and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102818196A CN102818196A (en) | 2012-12-12 |
| CN102818196B true CN102818196B (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210306030.6A Expired - Fee Related CN102818196B (en) | 2012-08-24 | 2012-08-24 | Backlight module and display device |
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| Country | Link |
|---|---|
| CN (1) | CN102818196B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1570720A (en) * | 2003-07-23 | 2005-01-26 | 鸿富锦精密工业（深圳）有限公司 | Backlight source device and liquid crystal display |
| CN101389897A (en) * | 2006-02-27 | 2009-03-18 | 富士通株式会社 | Illumination device and liquid crystal display device |
| TW201215968A (en) * | 2010-09-03 | 2012-04-16 | Lg Innotek Co Ltd | Backlight unit and method for manufacturing the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357823A (en) * | 2001-05-31 | 2002-12-13 | Optrex Corp | Backlight for liquid crystal display element |
| JP2004325959A (en) * | 2003-04-25 | 2004-11-18 | Matsushita Electric Works Ltd | Liquid crystal back light device |
-
2012
- 2012-08-24 CN CN201210306030.6A patent/CN102818196B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1570720A (en) * | 2003-07-23 | 2005-01-26 | 鸿富锦精密工业（深圳）有限公司 | Backlight source device and liquid crystal display |
| CN101389897A (en) * | 2006-02-27 | 2009-03-18 | 富士通株式会社 | Illumination device and liquid crystal display device |
| TW201215968A (en) * | 2010-09-03 | 2012-04-16 | Lg Innotek Co Ltd | Backlight unit and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102818196A (en) | 2012-12-12 |
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Granted publication date: 20150325 Termination date: 20210824 |