CN103123072A - Backlight module and liquid crystal display device utilizing backlight module - Google Patents
Backlight module and liquid crystal display device utilizing backlight module Download PDFInfo
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- CN103123072A CN103123072A CN2011103716645A CN201110371664A CN103123072A CN 103123072 A CN103123072 A CN 103123072A CN 2011103716645 A CN2011103716645 A CN 2011103716645A CN 201110371664 A CN201110371664 A CN 201110371664A CN 103123072 A CN103123072 A CN 103123072A
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Abstract
The invention provides a backlight module which has no light guide plate and is even in brightness and a liquid crystal display device utilizing the backlight module. The backlight module comprises a back plate used for supporting, a reflection unit and a light scattering unit, wherein the reflection unit and the light scattering unit are arranged on the back plate in sequence. A concave cambered face concaving towards the back plate side is formed on one face, opposite to the reflection unit, of the back plate. The reflection unit is tightly attached to the concave cambered face, and a cavity is formed between the reflection unit and the light scattering unit. A luminous unit which provides incident rays for at least the reflection unit is arranged on the end face of the cavity.
Description
Technical field
The present invention relates to a kind of backlight module and use the liquid crystal display of this backlight module.
Background technology
At present, liquid crystal display (LCD) is very general display, because it has power saving and the advantage such as be easy to carry about with one, is widely used on the electric equipment products of portables such as computer, mobile phone, PDA.
The structure of conventional liquid crystal is generally installed backlight module at the back side of LCD panel, this backlight module by upper diffusion sheet, prismatic lens, lower diffusion sheet, LGP and reflecting plate sequentially closed assembly form, and be provided with lampshade and fluorescent tube at the side of reflecting plate.The light that is sent by fluorescent tube turns to and incides on lower diffusion sheet by the effect of LGP and reflecting plate, and then this incident ray passes successively more lower diffusion sheet, prismatic lens and upper diffusion sheet and incides on display panels.Wherein, LGP is vital optics in the light conduction process, and its cost is generally higher.
For the problems referred to above, publication number is that the patent of CN1896837A discloses a kind of backlight module without LGP and diffuser plate, form the diffusing structure that projection is wavy, be similar to type shape, approximate mountain word shape or approximate zigzag fashion on the reflecting layer, and this reflecting layer is arranged on backboard, a side in the reflecting layer arranges speculum, luminescence unit is set on backboard, when luminescence unit is luminous, by the diffusing structure of reflecting layer or backboard, light source is exhaled and incides on light-passing board.In technique scheme, because being arranged on backboard and over against light-passing board, described luminescence unit arranges, the light major part of being sent by luminescence unit incides on the speculum that is arranged on reflecting layer one side, and then be mapped to via being reflected into of speculum on the diffusing structure of backboard, via the diffusing structure scattering, it is dispersed again etc., the conductive process that has increased like this light causes the remitted its fury of incident ray, is unfavorable for improving the brightness of whole display screen.Simultaneously, because luminescence unit is arranged on backboard towards light-passing board, easily make the distribution of light on light-passing board inhomogeneous.
Summary of the invention
In view of this, main purpose of the present invention is, provides a kind of without LGP and the uniform backlight module of brightness and the liquid crystal display of using this backlight module.
For achieving the above object, the present invention proposes a kind of backlight module, comprise for passive backboard and be successively set on reflector element on described backboard, luminescence unit and the light scattering unit, it is characterized in that the cancave cambered surface setting that the light of luminescence unit can be reflexed to the light scattering unit on the described reflector element one side that to be backboard relative with described light scattering unit.
Draw from the above mentioned, due to the cancave cambered surface setting that the light of luminescence unit can be reflexed to the light scattering unit on the described reflector element one side that to be backboard relative with described light scattering unit, the light that is sent by described luminescence unit incides on cancave cambered surface and reflects, can change the incident direction of the light that luminescence unit sends and it is shone on the light scattering unit, thereby substitute LGP used in the prior art to reduce the cost of backlight module.
Preferably, the one side form fit that described backboard is relative with described reflector element, and be close to setting.
Draw from the above mentioned, because described reflector element is cancave cambered surface setting and the described backboard one side form fit relative with described reflector element, being close to backboard on this cancave cambered surface, also to be concave arc planar.The light that is sent by described luminescence unit incides on the cancave cambered surface of described reflector element and reflects on this cancave cambered surface, can change the incident direction of the light that luminescence unit sends and it is shone on the light scattering unit, thereby substitute LGP used in the prior art to reduce the cost of backlight module.Simultaneously, because described reflector element is towards the sunk arc structure of described backboard side, the light that is sent by luminescence unit can be directly incident on the middle part of reflector element, has shortened the conducting path of light, avoids it to cause loss in conductive process.
Preferably, be formed with cavity between described reflector element and described light scattering unit, be disposed with a plurality of LED light emitting diodes in the end of this cavity, form described luminescence unit by these a plurality of LED light emitting diodes.
Draw from the above mentioned, owing to being formed with cavity between described reflector element and described light scattering unit, the transmitting medium of light is air, and the penetrance of light in this cavity is high, can reduce fading rate and the energy dissipation of light in conductive process.Simultaneously, owing to adopting the LED light emitting diode, can reduce energy consumption and extend its service life.
Preferably, along the setting party of described luminescence unit to, the middle part of described reflector element is towards protruding near described light scattering cell side, the two side portions of middle part that is close to this reflector element is dented towards the backboard side, and the two ends of described reflector element are higher than the peak of the middle part of described reflector element.
Draw from the above mentioned, due to along the setting party of described luminescence unit to, the middle part of reflector element is towards protruding near described light scattering cell side, its two side portions that is close to this middle part is dented towards the backboard side, and its two ends are higher than the peak of the middle part of described reflector element, like this, be conducive to make the middle part that shines the light scattering unit from the light of reflector element incident, thereby improve the uniformity of the light that shines display floater.
Preferably, along the setting party of described luminescence unit to, the radius of curvature of the close described luminescence unit side of described reflector element is less than or equal to it near the radius of curvature at described reflector element middle part.
Draw from the above mentioned, because the radius of curvature of the close described luminescence unit side of reflector element is less than or equal to it near the radius of curvature at reflector element middle part, be conducive to make near the incident ray of luminescence unit side and converge towards the middle part of described light scattering unit after reflection, avoid forming the dark space in the middle part of LCDs.
Preferably, be formed with the cancave cambered surface of approximate type shape or approximate mountain word shape on the one side relative with described light scattering unit of described reflector element.Be conducive to like this make shine the light scattering unit from the light of reflector element incident on, can improve the uniformity of the light that shines display floater.
Preferably, described reflector element is for can form to the light that is sent by described luminescence unit irreflexive the first reflector plate or reflectance coating at least.
Draw from the above mentioned, the light that is sent by luminescence unit incides on the first reflector plate or reflectance coating, and on its surface, diffuse reflection occurs, thereby the shadow surface of increasing light is conducive to form area source.
Preferably, described light scattering unit comprises: lower diffusion sheet, be arranged on the opposite of described reflector element, and be used for making the light from described reflector element incident to disperse; Prismatic lens is arranged on the top of described lower diffusion sheet, is used for improving the brightness from the light of described lower diffusion sheet transmission; Upper diffusion sheet is arranged on the top of described prismatic lens, is used for making from the optical haze of described prismatic lens incident, and described prismatic lens is formed protection.
Draw from the above mentioned, can improve owing to being provided with lower diffusion sheet and upper diffusion sheet the uniformity that shines the light on the light scattering unit, be conducive to guarantee the uniformity of brightness on display screen.Owing to being provided with prismatic lens, can strengthen from the brightness of the light of lower diffusion sheet transmission.
For achieving the above object, the invention allows for a kind of liquid crystal display, comprise display panels, it is characterized in that, be provided with below described display panels aforementioned in arbitrary described backlight module.
Description of drawings
Fig. 1 is the profile of liquid crystal display;
Fig. 2 is the enlarged drawing at A place in Fig. 1.
The specific embodiment
The below is described in detail the specific embodiment of the present invention by reference to the accompanying drawings take the liquid crystal display of television set as example.
Fig. 1 is the profile of liquid crystal display, and Fig. 2 is the enlarged drawing at A place in Fig. 1.For the convenience of describing, in following description, will be called near a side of display panels front (or top), be called the back side (or below) away from a side of display panels.The user oriented one side of display panels is called main-vision surface, to should main-vision surface upper (under) direction be called (under) side, a left side (right side) direction that should main-vision surface is called a left side (right side) side.In addition, in the present embodiment, backboard and reflector element are close to setting, reflector element is towards the sunk cancave cambered surface of backboard side, also form the cancave cambered surface shape that is complementary with this cancave cambered surface on the backboard one side relative with reflector element, in following description, for the convenience of describing, all adopt to be close to describing mode on this backboard cancave cambered surface forming cancave cambered surface and reflector element on backboard.
As Fig. 1-shown in Figure 2, the back side at display panels (not shown) is provided with backlight module, this backlight module comprises backboard 1, the first reflector plate 2, lower diffusion sheet 5, prismatic lens 6, upper diffusion sheet 7, and heat sink strip 3 and LED lamp bar 4, consist of light scattering of the present invention unit by lower diffusion sheet 5, prismatic lens 6, upper diffusion sheet 7, consist of reflector element of the present invention by the first reflector plate 2.
Backboard 1, the first reflector plate 2, lower diffusion sheet 5, prismatic lens 6, upper diffusion sheet 7 stack successively.Upside and the downside of corresponding backboard 1 and lower diffusion sheet 5 are symmetrically arranged with heat sink strip 3 between backboard 1 and lower diffusion sheet 5, an end of this heat sink strip 3 is connected to the back side of backboard 1, and its other end is connected to the back side of lower diffusion sheet 5.Be formed with on heat sink strip 3 towards the side-prominent projection 31 of backboard 1, this projection 31 embeds in the groove 11 that is formed on backboard 1, thereby can strengthen the steadiness that is connected of heat sink strip 3 and backboard 1.
The first reflector plate 2 has certain interval with lower diffusion sheet 5, surrounded the cavity 10 of a sealing by the first reflector plate 2, lower diffusion sheet 5 and the heat sink strip 3 that is arranged on its edge side, to the end face of upside that should cavity 10 and the end of downside, paste on heat sink strip 3 and be provided with a plurality of LED lamps 4, these a plurality of LED lamps 4 stick on the inner surface of heat sink strip 3 successively, and are arranged in a straight line and are strip.Be provided with a column 12 in the middle part of cavity 10, this column 12 arranges perpendicular to the first reflector plate 2 and lower diffusion sheet 5, the one end is fixed on backboard 1, and its other end is near the back side of lower diffusion sheet 5, is used for supporting the light scattering unit to prevent that it is towards dented near the first reflector plate 2 sides.
As shown in Figure 1, be formed with cancave cambered surface in the front of backboard 1, this cancave cambered surface is approximate mountain word shape on the whole.Look from a left side (right side) side direction of backboard 1 orientation of LED lamp 4 (namely along), the middle part of cancave cambered surface is towards protruding near the light scattering cell side, the two side portions that is close to this middle part is dented towards backboard 1 side, and the upper end of backboard 1 and hypomere are higher than the peak of the middle part of backboard 1.Simultaneously, the radius of curvature of the both sides of cancave cambered surface is less than the radius of curvature of intermediate portion, namely look from a left side (right side) side direction of backboard 1, on the one side that backboard 1 and the first reflector plate 2 fit, the arc surface that forms at its place, two ends is steeper than the arc surface at close column 12 places.The first reflector plate 2 matches with backboard 1 and merges the front that is close to backboard 1, and the first reflector plate 2 also is aforesaid cancave cambered surface structure on the whole.The light that LED lamp 4 sends incides on the cancave cambered surface of the first reflector plate 2 and on this cancave cambered surface, diffuse reflection occurs, can change the incident direction of the light that LED lamp 4 sends and it is shone on the light scattering unit, thereby substitute LGP used in the prior art to reduce the cost of backlight module.Simultaneously, due to the radius of curvature of close LED lamp 4 sides of cancave cambered surface less than its radius of curvature near column 12 sides, be conducive to make incident ray to converge towards the middle part of cavity 10 after the reflection of the first reflector plate 2, thereby avoid forming the dark space in the middle part of lower diffusion sheet 5.In addition, the general employing of backboard 1 has certain thickness and the passive plastic plate of energy, compare with backboard 1, the first reflector plate 2 is generally thinner, thereby make the first reflector plate 2 be on the whole the cancave cambered surface shape on this cancave cambered surface by then the first reflector plate 2 being close at formation cancave cambered surface on backboard 1, can simplify the manufacturing process of backlight module, also help simultaneously and reduce costs.
As shown in Figure 2, corresponding with LED lamp 4, be provided with auxiliary reflector plate 8 in the both sides up and down of backboard 1.Auxiliary reflector plate 8 is comprised of two parts, comprises the second reflector plate 82 and the 3rd reflector plate 81, and wherein, the second reflector plate 82 is close to the both sides up and down in the front that is arranged on backboard 1, and is connected with the edge of the both sides up and down of the first reflector plate 2; The 3rd reflector plate 81 is close to the back side that is arranged on heat sink strip 3 and lower diffusion sheet 5 phase access sections, and relative with the second reflector plate 82.Because LED lamp 4 is spot light, its light that sends will be dispersed to all directions, by the 3rd sheet emitting 81 LED lamp 4 can be sent towards the light orienting reflex of light scattering cell side to the second reflector plate 82, via this second reflector plate 82 with the centre of this part light orienting reflex to cavity 10, thereby improve the brightness in the centre of backlight module, avoid forming at this place the dark space.Look from a left side (right side) side direction of backboard 1, the second reflector plate 82 is close to upside and the downside of the cancave cambered surface of backboard 1, and its cambered surface length is greater than the length of the 3rd reflector plate 81, be conducive to like this make the incident ray of the LED lamp 4 that reflects via the 3rd reflector plate 81 to shine on the second reflector plate 82, thereby be added to the light that is mapped to the backlight module middle part, to prevent forming the dark space in the middle part of backlight module.
Structure in conjunction with above-mentioned backlight module is described, and its light conduction process is analyzed, and is specially:
The light that is sent by LED lamp 4 incides on the first reflector plate 2 and on this first reflector plate 2 diffuse reflection occurs.Because the front of the first reflector plate 2 has frosting, diffuse scattering occurs in this incident ray on the first reflector plate 2, can change the incident direction of incident ray, and this part incident ray is dispersed and increased its light-emitting area.Protrude because the first reflector plate 2 is middle on the whole, the sunk cancave cambered surface shape in both sides is conducive to make incident ray shine the position, intermediate portion and diffuse reflection occurs, thereby improves the uniformity of the light that shines lower diffusion sheet 5.
Light by the first reflector plate 2 reflections conducts in cavity 10.Because cavity 10 is hermetically-sealed construction, be air at the transmitting medium of these cavity 10 interior light, the penetrance of light in this cavity 10 is high, can reduce fading rate and the energy dissipation of light in conductive process.
Light by the first reflector plate 2 reflections incides on lower diffusion sheet 5,5 pairs of these reflection rays of this time diffusion sheet carry out light to be disperseed, wherein, most of light conducts to the front of lower diffusion sheet 5 through this time diffusion sheet 5, and some light is made the return trip empty by the backside reflection of lower diffusion sheet 5 in chamber 10.The light that conducts to lower diffusion sheet 5 fronts incides on prismatic lens 6, and improves its brightness via the effect of this prismatic lens 6.Be reflected back that light in cavity 10 incide on the first reflector plate 2 and the conductive process before continuing to repeat by lower diffusion sheet 5.The light that is penetrated by prismatic lens 6 incides on upper diffusion sheet 7, via diffusion sheet on this 7, it is further spread, to improve its uniformity.The light that is appeared by upper diffusion sheet 7 incides on display panels, thereby illuminates this display panels.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
For example, in the above-described embodiments, as shown in Figure 1, the light scattering unit is comprised of lower diffusion sheet 5, the upper diffusion sheet 7 that is arranged on the prismatic lens 6 of this time diffusion sheet 5 tops and is arranged on this prismatic lens top; Yet not limited thereto, also can increase other diffusion sheet structures.
Again for example, in the above-described embodiments, as shown in Figure 1, the upside of the corresponding backboard 1 of LED lamp 4 and downside and arrange, look from left side or the right side of backboard 1, the middle part of backboard 1 is towards protruding near the light scattering cell side, and its two side portions that is close to this middle part is dented towards the backboard side, and its two ends are higher than the peak of the middle part of backboard 1.Yet not limited thereto, the LED lamp also can be arranged on left side and the right side of backboard, correspondingly, look from upside or the downside of backboard, the middle part of backboard is towards protruding near the light scattering cell side, its two side portions that is close to this middle part is dented towards the backboard side, and its two ends are higher than the peak of the middle part of backboard.
Claims (9)
1. backlight module, comprise for passive backboard (1) and be successively set on reflector element on described backboard, luminescence unit and the light scattering unit, it is characterized in that the cancave cambered surface setting that the light of luminescence unit can be reflexed to the light scattering unit on the described reflector element one side that to be backboard (1) relative with described light scattering unit.
2. backlight module according to claim 1, is characterized in that, the one side form fit that described backboard (1) is relative with described reflector element, and be close to setting.
3. backlight module according to claim 2, it is characterized in that, be formed with cavity (10) between described reflector element and described light scattering unit, be disposed with a plurality of LED light emitting diodes (4) in the end of this cavity (10), form described luminescence unit by these a plurality of LED light emitting diodes (4).
4. backlight module according to claim 3, it is characterized in that, along the setting party of described luminescence unit to, the middle part of described reflector element is towards protruding near described light scattering cell side, the two side portions of middle part that is close to this reflector element is dented towards the backboard side, and the two ends of described reflector element are higher than the peak of the middle part of described reflector element.
5. according to claim 3 or 4 described backlight modules, is characterized in that, along the setting party of described luminescence unit to, the radius of curvature of the close described luminescence unit side of described reflector element is less than or equal to it near the radius of curvature at described reflector element middle part.
6. backlight module according to claim 1 and 2, is characterized in that, is formed with the cancave cambered surface of approximate type shape or approximate mountain word shape on the one side relative with described light scattering unit of described reflector element.
7. backlight module according to claim 1 and 2, is characterized in that, described reflector element is for can form to the light that is sent by described luminescence unit irreflexive the first reflector plate (2) or reflectance coating at least.
8. backlight module according to claim 1, is characterized in that, described light scattering unit comprises:
Lower diffusion sheet (5) is arranged on the opposite of described reflector element, is used for making the light from described reflector element incident to disperse;
Prismatic lens (6) is arranged on the top of described lower diffusion sheet (5), is used for improving the brightness from the light of described lower diffusion sheet (5) transmission;
Upper diffusion sheet (7) is arranged on the top of described prismatic lens (6), is used for making from the optical haze of described prismatic lens (6) incident, and described prismatic lens (6) is formed protects.
9. a liquid crystal display, comprise display panels, it is characterized in that, is provided with arbitrary described backlight module in claim 1-8 below described display panels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110371664.5A CN103123072B (en) | 2011-11-21 | 2011-11-21 | Backlight module and apply its liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110371664.5A CN103123072B (en) | 2011-11-21 | 2011-11-21 | Backlight module and apply its liquid crystal display |
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| CN103123072A true CN103123072A (en) | 2013-05-29 |
| CN103123072B CN103123072B (en) | 2016-03-09 |
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| CN201110371664.5A Active CN103123072B (en) | 2011-11-21 | 2011-11-21 | Backlight module and apply its liquid crystal display |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109844605A (en) * | 2016-06-29 | 2019-06-04 | 法雷奥舒适驾驶助手公司 | Video generation device and relevant head-up display including thermally contacting area |
| WO2020103386A1 (en) * | 2018-11-22 | 2020-05-28 | 惠科股份有限公司 | Backlight device and display unit therefor |
| CN115327812A (en) * | 2021-05-11 | 2022-11-11 | 行家光电股份有限公司 | Full-array light-emitting diode curved-surface lamp panel, curved-surface backlight module and curved-surface liquid crystal display |
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| JP2000011724A (en) * | 1998-06-26 | 2000-01-14 | Toshiba Lighting & Technology Corp | Back light, liquid crystal display and lighting system using this |
| CN101004507A (en) * | 2006-01-21 | 2007-07-25 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN101858566A (en) * | 2010-04-21 | 2010-10-13 | 刘姝 | Light source reflector used in backlight component and backlight component thereof |
| CN202382108U (en) * | 2011-11-21 | 2012-08-15 | 青岛海尔电子有限公司 | Backlight module and liquid crystal display equipment applying same |
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2011
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Patent Citations (4)
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| JP2000011724A (en) * | 1998-06-26 | 2000-01-14 | Toshiba Lighting & Technology Corp | Back light, liquid crystal display and lighting system using this |
| CN101004507A (en) * | 2006-01-21 | 2007-07-25 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN101858566A (en) * | 2010-04-21 | 2010-10-13 | 刘姝 | Light source reflector used in backlight component and backlight component thereof |
| CN202382108U (en) * | 2011-11-21 | 2012-08-15 | 青岛海尔电子有限公司 | Backlight module and liquid crystal display equipment applying same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109844605A (en) * | 2016-06-29 | 2019-06-04 | 法雷奥舒适驾驶助手公司 | Video generation device and relevant head-up display including thermally contacting area |
| WO2020103386A1 (en) * | 2018-11-22 | 2020-05-28 | 惠科股份有限公司 | Backlight device and display unit therefor |
| CN115327812A (en) * | 2021-05-11 | 2022-11-11 | 行家光电股份有限公司 | Full-array light-emitting diode curved-surface lamp panel, curved-surface backlight module and curved-surface liquid crystal display |
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| CN103123072B (en) | 2016-03-09 |
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Effective date of registration: 20160715 Address after: 266101 Haier Information Park, 1 Haier Road, hi tech park, Laoshan District, Qingdao, Shandong Patentee after: Qingdao Haier Electric Appliance Co., Ltd. Patentee after: haier group corporation Patentee after: Qingdao Haier Photoelectric Co., Ltd. Patentee after: QINGDAO HAIER MULTI-MEDIA CO., LTD. Address before: 266101 Haier Information Park, 1 Haier Road, hi tech park, Laoshan District, Qingdao, Shandong Patentee before: Qingdao Haier Electric Appliance Co., Ltd. Patentee before: haier group corporation Patentee before: Qingdao Haier Photoelectric Co., Ltd. |