CN100401159C - Direct-down type back-light module - Google Patents
Direct-down type back-light module Download PDFInfo
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- CN100401159C CN100401159C CNB2005101035954A CN200510103595A CN100401159C CN 100401159 C CN100401159 C CN 100401159C CN B2005101035954 A CNB2005101035954 A CN B2005101035954A CN 200510103595 A CN200510103595 A CN 200510103595A CN 100401159 C CN100401159 C CN 100401159C
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- light
- backlight module
- type backlight
- substrate
- direct type
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Abstract
An upright-down back lighting module includes a frame, the base plate, many light-emitting components and light leading units. The frame includes the bottom and the round wall extended from the side of the bottom. The base plate is set in the bottom of the frame and the light-emitting components are set on the base plate. The light leading unit covers the light-emitting components and exposures part base plates. The light leading unit has the light output side and the light input side with the concave glass. So the invention has the good white light uniform.
Description
Technical field
The present invention relates to a kind of backlight module, and be particularly related to a kind of direct type backlight module.
Background technology
Because the demand of display grows with each passing day, so industry drops into the exploitation of related display with all strength.Wherein, again with cathode-ray tube (CRT) (Cathode Ray Tube) because of having excellent display quality and technology maturation, so monopolize the monitor market throughout the year.Yet, recently since the rise of environmental protection notion for its energy resource consumption big with produce the bigger characteristic of radiant quantity, add that product flattening space is limited, therefore can't satisfy the market trend of market for light, thin, short, little, U.S. and low consumpting power.Therefore, have that high picture quality, space utilization efficient are good, (Thin Film Transistor Liquid CrystalDisplay TFT-LCD) becomes the main flow in market to the Thin Film Transistor-LCD of low consumpting power, advantageous characteristic such as radiationless gradually.
With regard to Thin Film Transistor-LCD, it mainly is made of display panels (liquid crystaldisplay panel) and backlight module (back light module).Wherein, display panels normally is made of thin-film transistor array base-plate (thin film transistor array substrate), colored optical filtering substrates (color filter substrate) and the liquid crystal layer that is arranged between this two substrates.Backlight module is in order to provide this display panels required area source, so that LCD MODULE reaches the effect of demonstration.In addition, backlight module is distinguished into direct type backlight module (direct type backlight module) and lateral incident type backlight module (side type back light module) again.Therefore compare with the lateral incident type backlight module, direct type backlight module can provide the area source of higher brightness, when the brightness to light source has high requirements, adopts direct type backlight module usually, below known at this point direct type backlight module describe.
Fig. 1 is the diagrammatic cross-section of known direct type backlight module.Please refer to Fig. 1, known direct type backlight module 100 comprise framework 110, heat sink 120, a plurality of light emitting diode (light emittingdiode, LED) 130, diffuser plate 140 and at least one blooming piece (optical film) 150.Heat sink 120 is arranged in the framework 110, and these light emitting diodes 130 are arranged on the heat sink 120, so the heat that light emitting diode 130 is produced can conduct to heat sink 120.In addition, these light-emitting diodes 130 are suitable for sending respectively ruddiness, green glow and blue light.Diffuser plate 140 is arranged in the framework 110 and is positioned at these light-emitting diode 130 tops, and blooming piece 150 is arranged on the diffuser plate 140.In addition, blooming piece 150 can be prismatic lens (prism sheet).
Above-mentioned these light-emitting diodes 130 the ruddiness that sends, green glow and blue light just be mixed into white light by after diffuser plate 140 and the blooming piece 150.Yet, when the brightness of light-emitting diode 130 is high more, have only the diffuser plate 140 of use can't produce uniform white light.In other words, under the situation that the brightness of light-emitting diode 130 increases,, have only thickness that increases diffuser plate 140 or the diffuser plate 140 that use has the low penetration rate in order to improve the homogeneity of white light.Perhaps, increase the distance between light-emitting diode 130 and the diffuser plate 140, but this kind method but is unfavorable for dwindling the thickness of known direct type backlight module 100.
Summary of the invention
In view of the foregoing, purpose of the present invention just provides a kind of direct type backlight module, and it has the homogeneity of preferable white light.
In addition, a further object of the present invention just provides a kind of direct type backlight module, and it has thin thickness.
Based on above-mentioned purpose or other purpose, the present invention proposes a kind of direct type backlight module, and it comprises framework, substrate, a plurality of light-emitting component and light element.Framework comprises the bottom and by the upwardly extending leg of the side of bottom, wherein substrate is arranged on the bottom of framework, and these light-emitting components are arranged on the substrate.Light element covers these light-emitting components, and exposes the part substrate, and wherein light element has specular exiting surface of concave surface and incidence surface.
Above-mentioned light element can also have at least one reflecting surface, and it connects exiting surface and incidence surface.
Above-mentioned light element can be the light conductor with a plurality of perforates, and these perforates expose the part substrate, and light conductor has specular exiting surface of concave surface and incidence surface, and covers these light-emitting components.In addition, the shape of these perforates can be rectangle or strip.
Above-mentioned light element can be a plurality of column light conductors separated from one another, and these column light conductors are arranged on the substrate and expose the part substrate.Each column light conductor has specular exiting surface of concave surface and incidence surface, and cover these light-emitting components at least one of them.
Above-mentioned direct type backlight module can also comprise diffuser plate, and it is arranged at the light element top.
Based on above-mentioned purpose or other purpose, the present invention proposes a kind of direct type backlight module, and it comprises framework, substrate, a plurality of light-emitting component and a plurality of light conductor.Framework comprises that the bottom reaches by the upwardly extending leg of the side of bottom, and substrate is arranged on the bottom of framework.These light conductors are arranged on the substrate, and each light conductor has the position at the incidence surface of side and the exiting surface that makes progress.These light-emitting components are arranged on the substrate, and with the incidence surface adjacency of these light conductors.
Above-mentioned each light conductor can comprise the flat part that abuts on the substrate and by the outer upwardly extending teat of a side direction of flat part, and wherein incidence surface is at the opposite side of flat part, and exiting surface is positioned at the end face of teat.
The incidence surface of above-mentioned each light conductor can be that concave surface is specular.
The exiting surface of above-mentioned each light conductor also can be that concave surface is specular.
Above-mentioned each light conductor can also have at least one reflecting surface, and reflecting surface connects exiting surface and incidence surface.
Above-mentioned direct type backlight module can also comprise diffuser plate, and it is arranged at these light conductor tops.
Based on above-mentioned, direct type backlight module of the present invention adopts the light element or the light conductor of various forms, and the versicolor light that light-emitting component sent can carry out mixed light by light element or light conductor earlier, to improve the homogeneity of white light.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the diagrammatic cross-section of known direct type backlight module.
Fig. 2 A and Fig. 2 B are respectively the schematic perspective view according to the light element of first embodiment of the invention.
Fig. 2 C is the diagrammatic cross-section of the direct type backlight module of first embodiment of the invention.
Fig. 3 A and Fig. 3 B are respectively the schematic perspective view according to the light element of second embodiment of the invention.
Fig. 4 A is the schematic perspective view according to the light conductor of third embodiment of the invention.
Fig. 4 B is the diagrammatic cross-section according to the light conductor of third embodiment of the invention.
The main element description of symbols
100: known direct type backlight module
110,210: framework
120: heat sink
130: light emitting diode
140,250: diffuser plate
150,260: blooming piece
200: direct type backlight module
212: the bottom
214: leg
220: substrate
230: light-emitting component
240a, 240b, 310a, 310b, 410: light element
242a: perforate
244a, 312a, 410a: exiting surface
244b, 312b, 410b: incidence surface
244c, 312c, 410c: reflecting surface
310a, 310b: column light conductor
410: light conductor
412: flat part
414: teat
Embodiment
First embodiment
Fig. 2 A and Fig. 2 B are respectively the schematic perspective view according to the light element of first embodiment of the invention.Fig. 2 C is the diagrammatic cross-section of the direct type backlight module of first embodiment of the invention.Please earlier with reference to Fig. 2 A and Fig. 2 C, the direct type backlight module 200 of present embodiment comprises framework 210, substrate 220, a plurality of light-emitting component 230 and light element 240a.Framework 210 comprises that bottom 212 reaches by the upwardly extending leg 214 of the side of bottom 212, and substrate 220 is arranged on the bottom 212 of framework 210.In addition, the material of framework 210 can be metal or plastics, and the material of substrate 220 can be metal, pottery, glass, silicon substrate or other suitable material etc.When the material of substrate 220 was metal, substrate 220 can be used as heat sink.
These light-emitting components 230 are arranged on the substrate 220, and these light-emitting components 230 can be light emitting diode (LED), organic electroluminescent LED (organic electro-luminescent diode, OELD) or the light-emitting component of other form.In addition, these light-emitting components 230 can be to send blue light, ruddiness and green glow respectively.Or these light-emitting components 230 also can be to send blue light and green-yellow light respectively, so that be mixed into white light.Yet other colour mixture mode that can be mixed into white light can also be used for present embodiment.In addition, these light-emitting components 230 can be chip form (chip type) or packaging body form (package type).Moreover the light-emitting component 230 of various coloured light can be arranged on together or be independent separately.
More specifically, light element 240a has exiting surface 244a and incidence surface 244b, and the incidence surface 244b of the light that each light-emitting component 230 is sent difference incident correspondence, again by corresponding exiting surface 244a outgoing.In addition, in order to improve the mixed light effect, it is specular that these exiting surfaces 244a and incidence surface 244b are concave surface.Yet each exiting surface 244a or incidence surface 244b also can be the planes, concave surface is specular or other shape.Because the light that these light-emitting components 230 are sent can mix in light element 240a, therefore when these light-emitting components 230 have higher brightness (for example being more than the 5W), direct type backlight module 200 can produce comparatively uniform white light.
In the present embodiment, in order to improve optical quality, direct type backlight module 200 can also comprise diffuser plate 250, and diffuser plate 250 is fixed on the framework 210 and be positioned at light element 240a top.In addition, direct type backlight module 200 also can comprise at least one blooming piece 260, and this blooming piece 260 is fixed on the framework 210 and be positioned at diffuser plate 250 tops.In addition, blooming piece 260 can be prismatic lens or polarization-type brightening piece (dual brightness enhanced film, DBEF).
In order to improve the mixed light effect of light element 240a, light element 240a also can have at least one reflecting surface 244c, and each reflecting surface 244c is connected to corresponding exiting surface 244a and incidence surface 244b respectively.For example, plate or attach upward reflection horizon (not shown) on sidewall (madial wall and the lateral wall) surface of light element 240a, to form a plurality of reflecting surface 244c, wherein the material in reflection horizon can be metal or white macromolecular material.
Please continue the B with reference to Fig. 2, for example, these light-emitting components 230 are also being to be arranged on the substrate 210 in the trellis mode.In addition, light element 240b has a plurality of perforate 242a, and these perforates 242a be shaped as rectangle.Similarly, light element 240b also can have exiting surface 244a, incidence surface 244b and reflecting surface 244c, and wherein reflecting surface 244c connects exiting surface 244a and incidence surface 244b.In addition, exiting surface 244a and incidence surface 244b also can be specular (shown in the similar Fig. 2 C) of plane, concave surface or other shape.
Second embodiment
Fig. 3 A and Fig. 3 B are respectively the schematic perspective view according to the light element of second embodiment of the invention.Please refer to Fig. 3 A and Fig. 3 B, present embodiment is similar to the aforementioned embodiment, and its difference is: in the present embodiment, wherein light element is a plurality of column light conductor 310a and 310b separated from one another.These column light conductor 310a and 310b are positioned at these light-emitting component 230 tops, and wherein column light conductor 310a is cylindric (as shown in Figure 3A), and column light conductor 310b is quadrangular prism (shown in Fig. 3 B).With regard to column light conductor 310a, each column light conductor 310a has an exiting surface 312a and incidence surface 312b, and the light that light-emitting component 230 is sent can carry out mixed light at the column light conductor 310a of correspondence, to produce uniform white light.Similarly, these exiting surfaces 312a and incidence surface 312b also can be specular (shown in the similar Fig. 2 A) of plane, concave surface or other shape.
In addition, each column light conductor 310a also can have reflecting surface 312c, and with the effect of raising mixed light, and reflecting surface 312 is connected to exiting surface 312a and incidence surface 312b.Yet for column light conductor 310b, column light conductor 310b has a plurality of reflecting surface 312c, and each reflecting surface 312 is connected to exiting surface 312a and incidence surface 312b.In the present embodiment, the height of these column light conductor 310a and 310b for example is between between the 1cm to 2cm.In addition, column light conductor 310b also can be triangular prism, five corner posts or other polygon corner post, yet column light conductor 310a and 310b also can be irregular cylinders.
What deserves to be mentioned is, if the light-emitting component 230 of present embodiment comprises red light-emitting element, blue light emitting element and green luminescence element, then each column light conductor 310a and 310b correspond to a red light-emitting element, a blue light emitting element and a green luminescence element at least.Therefore, each column light conductor 310a and 310b just can blend white light.In other words, when the mode that is mixed into white light (for example blue light and green-yellow light) not simultaneously, then each column light conductor 310a is also just different with the pairing light-emitting component 230 of 310b.In addition, the arrangement mode of light-emitting component 230 is not limited to shown in Fig. 3 A and Fig. 3 B, and light-emitting component 230 also can adopt alternate manner to arrange.
The 3rd embodiment
Fig. 4 A is the schematic perspective view according to the light conductor of third embodiment of the invention, and Fig. 4 B is the diagrammatic cross-section according to the light conductor of third embodiment of the invention.Please refer to Fig. 4 A and Fig. 4 B, present embodiment is similar to the various embodiments described above, and its difference is: in the present embodiment, these light conductors 410 are arranged on the substrate 220.Each light conductor 410 comprises the flat part 412 that abuts on the substrate 220 and by the outer upwardly extending teat 414 of a side direction of flat part 412.In addition, each light conductor 410 has exiting surface 410a and incidence surface 410b, and wherein incidence surface 410b is at the opposite side of flat part 412, and exiting surface 410a is positioned at the end face of teat 414.These light-emitting components 230 lay respectively at by the incidence surface 410b of corresponding light conductor 410.In other words, light conductor 410 is the side incident form.In addition, similarly, these exiting surfaces 410a and incidence surface 410b also can be specular (shown in the similar Fig. 2 C) of plane, concave surface or other shape.
It should be noted that in the present embodiment the distance between exiting surface 410a and the substrate 220 is greater than the thickness of light conductor 410.In other words, an end of light conductor 410 is up curved.Yet the distance between exiting surface 410a and the substrate 220 also can be the thickness that equals light conductor 410.At this moment, light conductor 410 is a tabular.In addition, the light conductor 410 of this form helps the slimming of whole direct type backlight module.
In sum, direct type backlight module of the present invention has following advantage:
One, the versicolor light that sends of high illumination element can be earlier carries out mixed light in the light element of various forms or light conductor, to improve the homogeneity of white light.
Two, because light that light-emitting component sent carries out mixed light in the light element of various forms or light conductor, therefore the thickness of whole direct type backlight module just can dwindle.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the present invention; when can doing a little change and improvement, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (11)
1. direct type backlight module is characterized in that comprising:
Framework comprises that the bottom reaches by the upwardly extending leg of the side of this bottom;
Substrate is arranged on this bottom of this framework;
A plurality of light-emitting components are arranged on this substrate; And
Light element covers above-mentioned these light-emitting components, and exposes this substrate of part, and wherein this light element has specular exiting surface of concave surface and incidence surface.
2. direct type backlight module according to claim 1 is characterized in that this light element also has at least one reflecting surface, connects this exiting surface and this incidence surface.
3. direct type backlight module according to claim 1, it is characterized in that this light element is the light conductor with a plurality of perforates, and above-mentioned these perforates expose this substrate of part, and this light conductor has this specular exiting surface of concave surface and this incidence surface, and cover above-mentioned these light-emitting components.
4. direct type backlight module according to claim 3 is characterized in that the shape of above-mentioned these perforates comprises rectangle.
5. direct type backlight module according to claim 3 is characterized in that the shape of above-mentioned these perforates comprises strip.
6. direct type backlight module according to claim 1, it is characterized in that this light element is a plurality of column light conductors separated from one another, above-mentioned these column light conductors are arranged on this substrate and expose this substrate of part, each column light conductor has this specular exiting surface of concave surface and this incidence surface, and cover above-mentioned these light-emitting components at least one of them.
7. direct type backlight module according to claim 1 is characterized in that also comprising diffuser plate, is arranged at this light element top.
8. direct type backlight module is characterized in that comprising:
Framework comprises that the bottom reaches by the upwardly extending leg of the side of this bottom;
Substrate is arranged on this bottom of this framework;
A plurality of light conductors, be arranged on this substrate, and each light conductor comprises the flat part that abuts on this substrate and by the outer upwardly extending teat of a side direction of this flat part, and each light conductor has the position at the incidence surface of side and the exiting surface that makes progress, this incidence surface is at the opposite side of this flat part, and this exiting surface is positioned at the end face of this teat;
Diffuser plate is arranged at above-mentioned these light conductor tops; And
A plurality of light-emitting components are arranged on this substrate, and with this incidence surface adjacency of above-mentioned these light conductors.
9. direct type backlight module according to claim 8, this incidence surface that it is characterized in that each light conductor is that concave surface is specular.
10. direct type backlight module according to claim 8, this exiting surface that it is characterized in that each light conductor is that concave surface is specular.
11. direct type backlight module according to claim 8 is characterized in that each light conductor also has at least one reflecting surface, connects this exiting surface and this incidence surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101035954A CN100401159C (en) | 2005-09-23 | 2005-09-23 | Direct-down type back-light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101035954A CN100401159C (en) | 2005-09-23 | 2005-09-23 | Direct-down type back-light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1936667A CN1936667A (en) | 2007-03-28 |
| CN100401159C true CN100401159C (en) | 2008-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101035954A Expired - Fee Related CN100401159C (en) | 2005-09-23 | 2005-09-23 | Direct-down type back-light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100401159C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10133027A (en) * | 1996-11-05 | 1998-05-22 | Mitsubishi Electric Corp | Back light unit and liquid crystal display device using the same |
| WO2004088372A1 (en) * | 2003-03-31 | 2004-10-14 | Osram Opto Semiconductors Gmbh | Method for the production of an illumination device and illumination device |
| CN1558283A (en) * | 2004-01-30 | 2004-12-29 | 友达光电股份有限公司 | Backlight module |
-
2005
- 2005-09-23 CN CNB2005101035954A patent/CN100401159C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10133027A (en) * | 1996-11-05 | 1998-05-22 | Mitsubishi Electric Corp | Back light unit and liquid crystal display device using the same |
| WO2004088372A1 (en) * | 2003-03-31 | 2004-10-14 | Osram Opto Semiconductors Gmbh | Method for the production of an illumination device and illumination device |
| CN1558283A (en) * | 2004-01-30 | 2004-12-29 | 友达光电股份有限公司 | Backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1936667A (en) | 2007-03-28 |
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Owner name: CPT TECHNOLOGY (GROUP) CO., LTD. Free format text: FORMER OWNER: CHINA PROJECTION TUBE CO., LTD. Effective date: 20130718 |
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Free format text: CORRECT: ADDRESS; FROM: TAIWAN, CHINA TO: 350000 FUZHOU, FUJIAN PROVINCE |
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Effective date of registration: 20130718 Address after: 350000, No. 1, building 6, building No. third, fourth, Confucian Road West, Mawei District, Fujian, Fuzhou Patentee after: CPT DISPLAY TECHNOLOGY (SHENZHEN)CO., LTD. Address before: Taiwan, Taipei, China Zhongshan North Road three paragraph twenty-two Patentee before: Chunghwa Picture Tubes Ltd. |
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Granted publication date: 20080709 Termination date: 20190923 |
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