CN103994379A - Low-invest large-size backlight module - Google Patents
Low-invest large-size backlight module Download PDFInfo
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- CN103994379A CN103994379A CN201410254583.0A CN201410254583A CN103994379A CN 103994379 A CN103994379 A CN 103994379A CN 201410254583 A CN201410254583 A CN 201410254583A CN 103994379 A CN103994379 A CN 103994379A
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- ladder
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- section bar
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Abstract
The invention belongs to back modules and in particular relates to a backlight module which is low in manufacturing cost and stable in structure. The backlight module is low in production cost, simple in structure and convenient and quick to install. The technical scheme is that the low-invest large-size backlight module comprises an aluminum section bar. The upper portion of the aluminum section bar is in a step shape, and the upper portion of the aluminum section bar is formed by a first step, a second step and a third step. The height of the first step, the height of the second step and the height of the third step increase progressively. A bottom plate is arranged at the upper portion of the first step, the height of the bottom plate is smaller than that of the first step, a light reflecting film is arranged on the second step, a light guiding plate is arranged on the light reflecting film, the light guiding plate and an aluminum substrate on the lateral wall of the second step are supported by a plurality of rubber blocks arranged between the light guiding plate and the aluminum substrate, a gap is formed between the light guiding plate and the lateral wall of the second step, a plurality of lamp beads are arranged in the gap, and a prismatic lens and a brightening lens are sequentially arranged at the top end of the light guiding plate. The low-invest large-size backlight module is low in cost and convenient and simple to install.
Description
Technical field
The invention belongs to backlight module, be specifically related to a kind of low cost of manufacture, Stability Analysis of Structures and backlight module is easily installed.
Background technology
The structure of LCD screen backlight module is all punching press backboard and plastic frame sealing backlight module optics at present.Therefore manufacturing LCDs needs design, manufactures backboard diel and plastic frame injection mould, and the manufacture of above-mentioned two kinds of moulds needs professional designer, professional production factory and special equipment, produces and prepares to have high input, and the cycle is long, and cost is high.
For business display device enterprise (as liquid crystal intelligent integrated machine manufactory), if manufacture LCDs according to existing conventional thinking, particularly large scale display screen is manufactured, with regard to Design of Dies, produce and just need to drop into millions of units, and commercial display device market capacity is limited, cause single-piece display screen cost high.
The present invention, by structural design and technological design, has realized a kind of early investment extremely low, the simple design of backlight module of structural manufacturing process.The model machine of manufacturing shows that this invention has solved the problem that backlight module manufacture has high input, and stable performance.Be very suitable for the production of small lot large scale liquid crystal module.
Conventional LCD screen backlight modular structure is: lamp bead weld is connected on aluminium base, aluminium base is bonded in becomes lamp bar on aluminium section bar, lamp bar is arranged on punching press backboard, in order to strengthen backboard intensity and mounting structure to be provided, backboard has generally also been designed with the structures such as drum, prominent muscle, need stamped backboard, general die cost is very high.Plastic frame coordinates parts such as forming cavity confined bed tabula rasa, BEF, DBEF with backboard, support liquid crystal panel simultaneously.Manufacture plastic frame and need injection mold, same expense is very high, and the LGP of conventional LCD screen backlight module is fixed LGP by the block rubber of projecting block and base plate, and this mode is not suitable for the support of large-size light-conducting plate, and complex structure, manufacturing cost is high.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, and technical problem to be solved is for providing a kind of production cost low, simple in structure, backlight module quick for installation.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the low size backlight module that has high input, comprise that top is stair-stepping aluminium section bar, the top of described aluminium section bar is by the first ladder highly increasing progressively, the second ladder and the 3rd ladder form, the height of described base plate is less than the height of the first ladder, Self-Clinching Standoffs is installed on base plate, between base plate and the first ladder, by screw, be connected with the cooperation of Self-Clinching Standoffs, on described the second ladder, be provided with reflective membrane, on reflective membrane, be provided with LGP, the reflective area of described reflective membrane is identical with the leaded light area of LGP, between the aluminium base of described LGP and the second stepped sidewalls, by a plurality of rubber columns, support, between the aluminium base of LGP and the second stepped sidewalls, form gap, in described gap, be provided with LED lamp pearl, a plurality of lamp pearls are distributed on aluminium base, the luminous end of described lamp pearl is towards LGP setting, the top of described LGP is also disposed with prismatic lens and blast sheet, between blast sheet and aluminium section bar the 3rd ladder, use the bonding sealing of sealant tape, sealant tape top end face above blast sheet is along edge, be provided with sealing strip.
The radiant light of band closed interior space and LED lamp pearl, sealing strip supports liquid crystal panel, and band and sealing strip substitute the effect of conventional backlight module plastic frame jointly.
On aluminium section bar the 3rd ladder and aluminium section bar three-flute are outstanding, be processed with screwed hole, guard shield Qi Gu center is processed with through hole, use screw that guard shield is played to drum and be fixed on aluminium section bar the 3rd ladder screwed hole top, use screw that guard shield is extended to the outstanding partial fixing of aluminium section bar three-flute in the bottom of the outstanding upper screwed hole of aluminium section bar three-flute.
The present invention is according to liquid crystal panel and LCDs specification requirement design aluminium section bar, be combined with base plate and substitute punching press backboard, aluminium section bar provides the facade that lamp pearl and aluminium base are installed, base plate buying finished product aluminium sheet, aluminum profile cross section size is less, mould manufacturing expense, less than 1,000 yuan, adds the aluminium section die of backlight module support girder, and mould drops into approximately 1500 yuan.Select the parts such as high temperature resistant, light tight (or low light transmission) band and adhesion process confined bed tabula rasa, select there is certain elasticity, sealing strip light tight, single spreading provides the support to liquid crystal panel, band and sealing strip replace the plastic frame of conventional LCD screen backlight module, remove the expensive expense that manufactures and designs plastic frame injection mould from.
Application the present invention: the LCDs manufacturing cost of the low size backlight module that has high input than the finished fluid crystal display screen price of market sale low 500 yuan～700 yuan of left and right, reduced complete machine production cost, increased enterprise profit.Due to LCDs self design, by system, coordinate, and optimize shield structure design, greatly simplified LCDs and liquid crystal intelligent touch all-in-one connection structure of outer shell, reduced transition piece, saved cost, improved efficiency of assembling.Owing to using band and adhesion process, avoid the light leakage phenomena that causes because of structure interval, significantly improved yield rate, by reasonable selection band with glue, can obtain good display performance and maintenanceability energy.Without manufacturing and designing the diel of producing LCD screen backlight module backboard, without the injection mold that manufactures and designs backlight module plastic frame.The LGP supporting construction technique of this programme design is simple, has reduced manufacturing cost, has solved under large-size light-conducting plate duty because of the yielding problem of gravity simultaneously.
Further, after described base plate and aluminium section bar the first ladder are connected by screw, between base plate top and aluminium section bar, form the cavity that holds miscellaneous part, terminal with compact integral structure, easy for installation.
Further, between four angles of described LGP and aluminium base, all by rubber column, support, between the middle part of described LGP and aluminium base, by block rubber, support, described block rubber and rubber column are resistant to elevated temperatures transparent material.
Further, be also provided with LED light compensating lamp pearl on described aluminium base, described light compensating lamp pearl is arranged on aluminium base edge, and the luminous end of light compensating lamp pearl, towards LGP setting, has been eliminated the problem that backlight module four angular brightness decline.
Further, the bottom of described aluminium section bar is set side by side with a plurality of mounting grooves, forms muscle rib structure simultaneously, has alleviated construction weight, has improved intensity.
The present invention compared with prior art has following beneficial effect: the present invention is according to the aluminium section bar of liquid crystal panel and LCDs specification requirement design, be combined with base plate and substitute punching press backboard, aluminium section bar provides the facade that lamp pearl and aluminium base are installed, base plate buying finished product aluminium sheet, aluminum profile cross section size is less, mould manufacturing expense, less than 1,000 yuan, adds the aluminium section die of backlight module support girder, and mould drops into approximately 1500 yuan.Select the parts such as high temperature resistant, light tight (or low light transmission) band and adhesion process confined bed tabula rasa, select there is certain elasticity, sealing strip light tight, single spreading provides the support to liquid crystal panel, band and sealing strip replace the plastic frame of conventional LCD screen backlight module, remove the expensive expense that manufactures and designs plastic frame injection mould from.
Application the present invention: the manufacturing cost of the LCDs of the low size backlight module that has high input than the finished product liquid crystal display price of market sale low 500 yuan～700 yuan of left and right, reduced production cost, increased the profit of enterprise.Due to LCDs self design, by system and coordination, and optimize shield structure design, greatly simplified LCDs and liquid crystal intelligent touch all-in-one connection structure of outer shell, reduced transition piece, saved cost, improved efficiency of assembling.Owing to using band and adhesion process, avoid the light leakage phenomena that causes because of structure interval, significantly improved yield rate, by reasonable selection band with glue, can obtain good display performance and maintenanceability energy.Without manufacturing and designing the diel of producing LCD screen backlight module backboard, without the injection mold that manufactures and designs backlight module plastic frame.The LGP supporting construction technique of this programme design is simple, has reduced manufacturing cost, has solved under large-size light-conducting plate duty because of the yielding problem of gravity simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is internal structure schematic diagram 1 of the present invention.
Fig. 2 is internal structure schematic diagram 2 of the present invention.
Fig. 3 is the partial enlarged drawing at A place in Fig. 1.
In figure: 1 is aluminium section bar, 2 is base plate, and 3 is reflective membrane, and 4 is LGP, 5 is rubber column, and 6 is lamp pearl, and 7 is prismatic lens, and 8 is blast sheet, 9 is liquid crystal panel, and 10 is sealing strip, and 11 is the first ladder, and 12 is the second ladder, 13 is the 3rd ladder, and 14 is sealant tape, and 15 is upper bound edge, 16 is aluminium base, and 17 is block rubber, and 18 is light compensating lamp pearl, 19 is mounting groove, and 20 is Self-Clinching Standoffs, and 21 is guard shield.
The specific embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation, and the schematic diagram of accompanying drawing for simplifying, basic structure of the present invention is only described in a schematic way, so it only shows the formation relevant with the present invention.
As Figure 1-3, the low size backlight module that has high input, comprise that top is the stair-stepping aluminium section bar 1 of base plate 2, the top of described aluminium section bar 1 is by the first ladder 11 highly increasing progressively, the second ladder 12 and the 3rd ladder 13 form, the height of described base plate 2 is less than the height of the first ladder 11, on base plate 2, there is Self-Clinching Standoffs 20, between base plate 2 and the first ladder 11, by screw, be connected with the cooperation of Self-Clinching Standoffs 20, on described the second ladder 12, be provided with reflective membrane 3, on reflective membrane 3, be provided with LGP 4, the reflective area of described reflective membrane 3 is identical with the leaded light area of LGP 4, between aluminium base 16 on described LGP 4 and the second ladder 12 sidewalls, by a plurality of rubber columns 5, support, between aluminium base 16 on LGP 4 and the second ladder 12 sidewalls, form gap, in described gap, be provided with LED lamp pearl 6, a plurality of lamp pearls 6 are distributed on aluminium base 16, the luminous end of described lamp pearl 6 arranges towards LGP 4, the top of described LGP 4 is also disposed with prismatic lens 7 and blast sheet 8, between blast sheet 8 and aluminium section bar the 3rd ladder 13, use the bonding sealing of sealant tape 14, sealant tape 14 top end faces above blast sheet 8 are along edge, be provided with sealing strip 10.
The outside of described aluminium section bar 1 is fixed with guard shield 21 by screw, upper bound edge 15 edges of guard shield 21 extend to the top of sealing strip 10, the through hole that passes upper bound edge 15 Qi Gu centers, bottom by screw between upper bound edge 15 and the 3rd ladder 13 is connected, and described band 14 is light tight or low light transmission material.
As preferably, after described base plate 2 is connected by screw with aluminium section bar 1 first ladder 11, between base plate 2 tops and aluminium section bar 1, form the cavity that holds miscellaneous part.
As preferably, between four angles of described LGP 4 and aluminium base 16, all by rubber column 5, support, between the middle part of described LGP 4 and aluminium base 16, by block rubber 17, support, described rubber column 5 and block rubber 17 are resistant to elevated temperatures transparent material.
As preferably, on described aluminium base 16, be also provided with light compensating lamp pearl 18, described light compensating lamp pearl 18 is arranged on aluminium base 16 edges, and the luminous end of light compensating lamp pearl 18 arranges towards LGP 4.
As preferably, the bottom of described aluminium section bar 1 is set side by side with a plurality of mounting grooves 19.
The present invention is according to the aluminium section bar 1 of liquid crystal panel 9 and LCDs specification requirement design, substitute punching press backboard with base plate 2 combinations, aluminium section bar 1 provides the facade that lamp pearl 6 and aluminium base 16 are installed, base plate 2 buying finished product aluminium sheets, aluminium section bar 1 sectional dimension is less, mould manufacturing expense, less than 1,000 yuan, adds aluminium section bar 1 mould of backlight module support girder, and mould drops into approximately 1500 yuan.Select the parts such as high temperature resistant, light tight (or low light transmission) band 14 and adhesion process confined bed tabula rasa 4, select there is certain elasticity, sealing strip 10 light tight, single spreading provides the support to liquid crystal panel 9, band 14 and sealing strip 10 replace the plastic frame of conventional LCD screen backlight module, remove the expensive expense that manufactures and designs plastic frame injection mould from.
Application the present invention: the LCDs manufacturing cost of the low size backlight module that has high input than the finished product liquid crystal display price of market sale low 500 yuan～700 yuan of left and right, reduced complete machine production cost, increased the profit of enterprise.Due to LCDs self design, by system and coordination, and by optimizing guard shield 21 structural designs, LCDs and liquid crystal intelligent touch all-in-one connection structure of outer shell have greatly been simplified, reduce transition piece, saved cost, improved efficiency of assembling.Owing to using band 14 and adhesion process, avoid the light leakage phenomena that causes because of structure interval, significantly improved yield rate, by reasonable selection band 14 with glue, can obtain good display performance and maintenanceability energy.Without manufacturing and designing the diel of producing LCD screen backlight module backboard, without the injection mold that manufactures and designs backlight module plastic frame.The LGP 4 supporting construction techniques of this programme design are simple, reduced manufacturing cost, solved under large-size light-conducting plate 4 duties because of the yielding problem of gravity simultaneously.
By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, makes a variety of changes.
Claims (5)
1. the low size backlight module that has high input, it is characterized in that, comprise that base plate (2) and top are stair-stepping aluminium section bar (1), the top of described aluminium section bar (1) is by the first ladder (11) highly increasing progressively, the second ladder (12) and the 3rd ladder (13) form, the height of described base plate (2) is less than the height of the first ladder (11), on base plate (2), be provided with Self-Clinching Standoffs (20), between base plate (2) and the first ladder (11), by screw, be connected with the cooperation of Self-Clinching Standoffs (20), on described the second ladder (12), be provided with reflective membrane (3), on reflective membrane (3), be provided with LGP (4), the reflective area of described reflective membrane (3) is identical with the leaded light area of LGP (4), between aluminium base (16) on the sidewall of described LGP (4) and the second ladder (12), by a plurality of rubber columns (5), support, between aluminium base (16) on the sidewall of LGP (4) and the second ladder (12), form gap, in described gap, be provided with LED lamp pearl (6), a plurality of lamp pearls (6) are distributed on aluminium base (16), the luminous end of described lamp pearl (6) arranges towards LGP (4), the top of described LGP (4) is also disposed with prismatic lens (7) and blast sheet (8), between blast sheet (8) and aluminium section bar the 3rd ladder (13), use the bonding sealing of sealant tape (14), edge along sealant tape (14) top end face is provided with sealing strip (10).
2. the low size backlight module that has high input according to claim 1, it is characterized in that, after described base plate (2) is connected by screw with aluminium section bar (1) first ladder (11), between base plate (2) top and aluminium section bar (1), form the cavity that holds miscellaneous part.
3. the low size backlight module that has high input according to claim 2, it is characterized in that, between four angles of described LGP (4) and aluminium base (16), all by rubber column (5), support, between the middle part of described LGP (4) and aluminium base (16), by block rubber (17), support, described rubber column (5) and block rubber (17) are resistant to elevated temperatures transparent material.
4. the low size backlight module that has high input according to claim 3, it is characterized in that, on described aluminium base (16), be also provided with LED light compensating lamp pearl (18), described light compensating lamp pearl (18) is arranged on aluminium base (16) edge, and the luminous end of light compensating lamp pearl (18) arranges towards LGP (4).
5. the low size backlight module that has high input according to claim 4, is characterized in that, the bottom of described aluminium section bar (1) is set side by side with a plurality of mounting grooves (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410254583.0A CN103994379B (en) | 2014-06-10 | 2014-06-10 | The low size backlight module that has high input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410254583.0A CN103994379B (en) | 2014-06-10 | 2014-06-10 | The low size backlight module that has high input |
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| Publication Number | Publication Date |
|---|---|
| CN103994379A true CN103994379A (en) | 2014-08-20 |
| CN103994379B CN103994379B (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410254583.0A Active CN103994379B (en) | 2014-06-10 | 2014-06-10 | The low size backlight module that has high input |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI699595B (en) * | 2019-03-29 | 2020-07-21 | 瑞儀光電股份有限公司 | Backlight module and display device |
| CN111458937A (en) * | 2020-04-28 | 2020-07-28 | 宁波视睿迪光电有限公司 | Display module and electronic equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040036258A (en) * | 2002-10-24 | 2004-04-30 | 엘지.필립스 엘시디 주식회사 | Liquid crystal display |
| CN1797100A (en) * | 2004-12-29 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and frame |
| CN1900791A (en) * | 2005-07-20 | 2007-01-24 | 株式会社日立显示器 | Liquid crystal display device |
| CN102798044A (en) * | 2012-08-02 | 2012-11-28 | 深圳市华星光电技术有限公司 | Edge-lighting backlight module |
| CN203963688U (en) * | 2014-06-10 | 2014-11-26 | 长治市华烨光电科技有限责任公司 | A kind of low size backlight module that has high input |
-
2014
- 2014-06-10 CN CN201410254583.0A patent/CN103994379B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040036258A (en) * | 2002-10-24 | 2004-04-30 | 엘지.필립스 엘시디 주식회사 | Liquid crystal display |
| CN1797100A (en) * | 2004-12-29 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and frame |
| CN1900791A (en) * | 2005-07-20 | 2007-01-24 | 株式会社日立显示器 | Liquid crystal display device |
| CN102798044A (en) * | 2012-08-02 | 2012-11-28 | 深圳市华星光电技术有限公司 | Edge-lighting backlight module |
| CN203963688U (en) * | 2014-06-10 | 2014-11-26 | 长治市华烨光电科技有限责任公司 | A kind of low size backlight module that has high input |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI699595B (en) * | 2019-03-29 | 2020-07-21 | 瑞儀光電股份有限公司 | Backlight module and display device |
| CN111458937A (en) * | 2020-04-28 | 2020-07-28 | 宁波视睿迪光电有限公司 | Display module and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103994379B (en) | 2016-06-08 |
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Address after: 046000 No. 1 Workshop, Row 2, No. 65 North Dongxin Street Industrial Park, Changzhi City, Shanxi Province Patentee after: Shanxi Huayi Mining Material Manufacturing Co.,Ltd. Address before: 046000 No. 1 Workshop, Row 2, No. 65 North Dongxin Street Industrial Park, Changzhi City, Shanxi Province Patentee before: Shanxi Huayicai Electronic Technology Co.,Ltd. |
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Effective date of registration: 20230710 Address after: 046000 No.15, west section of Huifeng street, Luzhou District, Changzhi City, Shanxi Province Patentee after: Shanxi Huajia tech Photoelectric Technology Co.,Ltd. Address before: 046000 No. 1 Workshop, Row 2, No. 65 North Dongxin Street Industrial Park, Changzhi City, Shanxi Province Patentee before: Shanxi Huayi Mining Material Manufacturing Co.,Ltd. |