CN103162165A - Direct type light-emitting diode (LED) backlight module provided with free-form surface lens - Google Patents
Direct type light-emitting diode (LED) backlight module provided with free-form surface lens Download PDFInfo
- Publication number
- CN103162165A CN103162165A CN2011104118901A CN201110411890A CN103162165A CN 103162165 A CN103162165 A CN 103162165A CN 2011104118901 A CN2011104118901 A CN 2011104118901A CN 201110411890 A CN201110411890 A CN 201110411890A CN 103162165 A CN103162165 A CN 103162165A
- Authority
- CN
- China
- Prior art keywords
- free
- backlight module
- form surface
- led
- surface lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
Provided is a direct type light-emitting diode (LED) backlight module provided with a free-form surface lens. The direct type LED backlight module comprises a backlight module cavity, the free-form surface lens, LEDs, a brightening module and a diffusion film. The direct type LED backlight module is characterized in that the free-form surface lens is arranged on the LEDs, the LED elements provided with the free-form surface lens are arranged at the bottom of the backlight module cavity in a plane-array mode, a light-emitting direction faces towards a panel, and the brightening module is arranged on the LED array provided with the free-form lens in the backlight module cavity. The direct type LED backlight module has the advantages that transmittance rates of light rays when passing through the brightening module are improved, light energy loss of the backlight module is reduced and whole light energy use ratios are improved due to the fact that space light-emitting energy distribution of the LEDs is matched with distribution characteristics of space angles of the transmittance rates of the brightening module by changing the space light-emitting energy distribution of the LEDs.
Description
Technical field
The present invention relates to a kind of semiconductor light emitting components and parts, particularly a kind of direct-light type LED backlight module that free-form surface lens is housed.
Background technology
In recent years, consumer electronics flourish, the market demand of the display device of each size is increasing, and wherein, liquid crystal display has occupied the absolute leading position of FPD with multiple advantages such as frivolous, low-cost, high image quality.
A kind of passive luminescent device of liquid crystal, need the light that backlight sends to come display image content, common backlight comprises cold-cathode tube (CCFL) and light emitting diode (LED) etc., wherein LED with high luminous efficiency, high colour developing ability, low-voltage driving, do not contain fragile part, do not contain the advantages such as heavy metal material and replace just rapidly the mainstream technology that CCFL becomes backlight.According to authoritarian structure prediction, the LED-backlit source will will occupy in 2014 and surpass 90% LCD backlight market.
Consider from structure, LED-backlit can be divided into side incident type and straight-down negative (end is illuminated).Wherein in side incident type, LED lamp bar is arranged in a side of panel, the scattering process by the leaded light particle of LGP is converted to the line source of side surface direction towards the area source of panel direction, the optical thin film such as diffusion barrier, brightness enhancement film with area source be converted to can be used as panel backlight uniformly, have the backlight of certain dispersion angle; In straight-down negative (end is illuminated), LED array directly is arranged in below panel, and the light that needs equally the optical thin films such as diffusion barrier, brightness enhancement film that LED array is sent is converted to the satisfactory backlight of quality.
In general, the thickness of side incident type LED-backlit module is less, technology maturation, be applicable to the small-medium size LCDs, as mobile phone, panel computer, digital photo frame, GPS etc., still, after size increases, the leaded light ability of LGP descends, even change monolateral lamp bar into bilateral even four cowl lamp bars, also can occur dark fringe (as the dark line of common " X " sample) on screen.The ultra-thin performance of straight-down negative (end is illuminated) LED-backlit module is slightly inferior, but be not subjected to screen size limitations, be particularly suitable for the oversize screen, and use LED array in straight-down negative (end is illuminated) LED-backlit, each LEDs is corresponding to the screen zones of different, can realize the high-contrast image quality according to the light and shade of each LEDs of image content dynamic adjustments, i.e. the dynamic light adjustment technology.
LED-backlit is as a kind of low energy consumption scheme backlight, and except brightness, outside module thickness, its energy consumption and performance is the importance of overall performance.In the straight-down negative scheme of routine, the optical films such as diffusion barrier, brightness enhancement film all can produce considerable light energy loss.
For brightness enhancement film, his primary structure is to comprise the periodically layers of prisms of microprism, in order to reach the purpose that increases front face brightness, a normal brightness enhancement film or two brightness enhancement film groups that quadrature stacks used in backlight module.The luminous light of LED incides the brightness enhancement film rear portion and sees through the layers of prisms outgoing, and a part is got back to back light system by the total reflection of layers of prisms, then continues to attempt passing through brightness enhancement film by the reflection of back light system.Like this, what see through brightness enhancement film is all the less positive direction light of angle, and brightness enhancement film can effectively can play convection light, increases the effect of positive briliancy.but, light is in reflection process repeatedly, the energy of considerable part is depleted, these light energy losses have limited the performance of LED-backlit power savings advantages, experimental results show that, when the light of different spaces angle passes through brightness enhancement film, transmitance is very not identical, the light transmission rate that is brightness enhancement film has very strong space angle distribution characteristics, and relevant with the reflection characteristic of back light system, if can change the dimensional energy distribution of the light that incides brightness enhancement film, the light transmission rate of itself and brightness enhancement film is complementary, the light energy loss that is caused by brightness enhancement film so can reduce greatly, thereby reduce the energy consumption of backlight module integral body.
Summary of the invention
The objective of the invention is for the defective that exists in prior art, a kind of direct-light type LED backlight module that free-form surface lens is housed is provided.Technical scheme provided by the invention is the direct-light type LED backlight module of a kind of backlight module bottom mounting plane LED array, the free-form surface lens that a kind of LED of change space goes out light energy distribution is arranged on LED, transmitance when the space angle distribution characteristics that the space by coupling LED goes out the transmitance of light energy distribution and brightness enhancement film group improves light by the brightness enhancement film group increases the module integral body efficiency of light energy utilization then.
The present invention includes: backlight module chamber, free-form surface lens, LED, brightness enhancement film group, diffusion barrier, it is characterized in that being provided with free-form surface lens on described LED, the LED element that free-form surface lens is housed is arranged on the bottom in backlight module chamber with the planar array form, light direction is in the face of panel, is equipped with in the backlight module chamber on the LED array of free-form surface lens and is provided with the brightness enhancement film group.
The LED array that free-form surface lens is housed is arranged on the backlight module bottom, and light direction is in the face of panel, and the module inwall has the high reflectance greater than 50%, and reflection type can be mirror-reflection or diffuse reflection but is not limited to above form.
Free-form surface lens is arranged on LED with the form of optical lens or secondary optical lens, can change LED original space and go out light energy distribution.Wherein, the space of LED goes out light energy distribution and can describe with latitude and longitude angle, angle of latitude is value between the 0-90 degree, longitude angle is value between the 0-360 degree, space after the change of LED of free-form surface lens is housed light energy distribution and can be described to angle of latitude scope A and longitude angle scope B, A can be arbitrary continuation or the discontinuous interval in the 0-90 degree, and B can be arbitrary continuation or the discontinuous interval in the 0-360 degree.
For the consideration of energy-saving application, comprise have change total light extraction efficiency of LED that the LED space goes out the free-form surface lens of light energy distribution should be higher than 90%.
Described brightness enhancement film group is to have one deck of prism structure or the brightness enhancement film of two layers.The brightness enhancement film group has the space angle distribution characteristics to the transmitance of the light that sees through it, the LED array of free-form surface lens is housed directly in the face of the brightness enhancement film group, the original space of free-form surface lens change LED goes out light energy distribution, the space angle distribution characteristics that this space goes out the transmitance of light energy distribution and brightness enhancement film group is complementary, thereby improved the transmitance of LED emergent ray during by the brightness enhancement film group that free-form surface lens is housed, then increased the whole efficiency of light energy utilization of backlight module.
Advantage of the present invention is to go out light energy distribution so that the transmitance of the space angle distribution characteristics of the transmitance of itself and brightness enhancement film group when being complementary to improve light by the brightness enhancement film group by the space that the LED array of free-form surface lens is equipped with in change, thereby reduce the luminous energy loss of backlight module, improve the whole efficiency of light energy utilization.
Description of drawings
Fig. 1 has the brightness enhancement film schematic diagram of layers of prisms;
Fig. 2-1 comprises individual brightness enhancement film direct-light type LED backlight module overall structure figure;
Fig. 2-2 comprise dual brightness enhancement film direct-light type LED backlight module overall structure figure;
The transmitance space angle distribution characteristics figure (longitude) of individual brightness enhancement film of Fig. 3-1;
The transmitance space angle distribution characteristics figure (latitude) of individual brightness enhancement film of Fig. 3-2;
The transmitance space angle distribution characteristics figure (longitude) of Fig. 3-3 dual brightness enhancement film;
The transmitance space angle distribution characteristics figure (latitude) of Fig. 3-4 dual brightness enhancement film;
Fig. 4-1 is applicable to having of individual brightness enhancement film and changes the free-form surface lens schematic diagram that the LED space goes out the light energy distribution function;
Fig. 4-2 are applicable to having of dual brightness enhancement film and change the free-form surface lens schematic diagram that the LED space goes out the light energy distribution function.
In figure: thickness, the c of the prism cycle of a brightness enhancement film prism structure, b brightness enhancement film prism structure: the prism vertex angle of brightness enhancement film prism structure, 1 backlight module chamber, 2-1 are applicable to containing of individual brightness enhancement film to have and changes LED, 2-2 that the LED space goes out the free-form surface lens of light energy distribution function and be applicable to containing of dual brightness enhancement film and have the LED that changes the LED space and go out the free-form surface lens of light energy distribution function, 30 ° of brightness enhancement film, 4 90 ° of brightness enhancement film, 5 diffusion barriers.
The specific embodiment
Embodiment one
Further illustrate the present embodiment below in conjunction with accompanying drawing:
The present embodiment comprises: backlight module chamber 1, be applicable to containing of individual brightness enhancement film and have the LED 2-1 that changes the LED space and go out the free-form surface lens of light energy distribution function, 0 ° of brightness enhancement film 3, diffusion barrier 5, being applicable to containing of individual brightness enhancement film has and changes the bottom that LED2-1 (referring to Fig. 4-1) that the LED space goes out the free-form surface lens of light energy distribution function is arranged on backlight module chamber 1, light direction is in the face of panel, is provided with 0 ° of brightness enhancement film 3 on the LED array in backlight module chamber 1.The prism structure of 0 ° of brightness enhancement film 3 as shown in Figure 1, overall structure is as shown in Fig. 2-1, backlight module chamber 1 comprises 0 ° of brightness enhancement film 3 and a diffusion barrier 5; Installed to have with the secondary optics form and change the LED2-1 that the LED space goes out the free-form surface lens of light energy distribution function and be arranged on the bottom in backlight module chamber 1 with array way, the inwall in backlight module chamber 1 is that reflectivity is 90% mirror reflection surface; Be equipped with and have that to change the light extraction efficiency of LED2-1 that the LED space goes out the free-form surface lens of light energy distribution function be 97%, the LED space can be gone out light energy distribution and be limited in 10 °-75 ° of angle of latitude, 30 °-150 ° of longitude angle, in 210 °-330 °, the transmitance of individual brightness enhancement film 3 has the space angle distribution characteristics as shown in Fig. 3-1, Fig. 3-2, can improve the transmitance of brightness enhancement film after the transmitance space angle distribution characteristics of the bright dipping dimensional energy distribution of LED and brightness enhancement film coupling, improve the whole efficiency of light energy utilization of module.
Embodiment two
Identical with embodiment one, difference is in the present embodiment, installed to have with the secondary optics form and change LED 2-2 (referring to Fig. 4-2) that the LED space goes out the free-form surface lens of light energy distribution function and be arranged on the bottom in backlight module chamber 1 with array way, the mutually orthogonal brightness enhancement film group (0 ° of brightness enhancement film 3,90 ° of brightness enhancement film 4) of the prism direction of two brightness enhancement film is arranged on LED array in backlight module chamber 1; And the LED space is gone out light energy distribution be limited in 10 °-70 ° of angle of latitude, 15 °-55 ° of longitude angle, 120 °-160 °, 200 °-240 °, in 305 °-345 °, overall structure is as shown in Fig. 2-2.The space angle distribution characteristics of 0 ° of brightness enhancement film 3,90 ° of brightness enhancement film 4 transmitances is as shown in Fig. 3-3, Fig. 3-4.
Claims (6)
1. direct-light type LED backlight module that free-form surface lens is housed, comprise: backlight module chamber, free-form surface lens, LED, brightness enhancement film group, diffusion barrier, it is characterized in that on described LED, free-form surface lens being housed, the LED element that free-form surface lens is housed is arranged on the bottom in backlight module chamber with the planar array form, light direction is in the face of panel, is equipped with in the backlight module chamber on the LED array of free-form surface lens and is provided with the brightness enhancement film group.
2. the direct-light type LED backlight module that free-form surface lens is housed according to claim 1, the inwall that it is characterized in that described backlight module chamber has the high reflectance greater than 50%.
3. the direct-light type LED backlight module that free-form surface lens is housed according to claim 1 is characterized in that described free-form surface lens is arranged on LED with the form of optical lens or secondary optical lens.
4. the direct-light type LED backlight module that free-form surface lens is housed according to claim 1 is characterized in that total light extraction efficiency of the described LED that free-form surface lens is housed is higher than 90%.
5. the direct-light type LED backlight module that free-form surface lens is housed according to claim 1, is characterized in that described brightness enhancement film group is to have one deck of prism structure or the brightness enhancement film of two layers.
6. the direct-light type LED backlight module that free-form surface lens is housed according to claim 1, it is characterized in that the described LED array of free-form surface lens that is equipped with is directly in the face of brightness enhancement film, the original space of free-form surface lens change LED goes out light energy distribution, and the space angle distribution characteristics that this space goes out the transmitance of light energy distribution and brightness enhancement film group is complementary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104118901A CN103162165A (en) | 2011-12-12 | 2011-12-12 | Direct type light-emitting diode (LED) backlight module provided with free-form surface lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104118901A CN103162165A (en) | 2011-12-12 | 2011-12-12 | Direct type light-emitting diode (LED) backlight module provided with free-form surface lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103162165A true CN103162165A (en) | 2013-06-19 |
Family
ID=48585493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104118901A Pending CN103162165A (en) | 2011-12-12 | 2011-12-12 | Direct type light-emitting diode (LED) backlight module provided with free-form surface lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103162165A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154494A (en) * | 2014-07-09 | 2014-11-19 | 华南理工大学 | Free-form surface optical lens for ultrathin straight down type LED backlight system |
| CN104534365A (en) * | 2015-01-04 | 2015-04-22 | 赵立地 | Direct type backlight module light bar |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639181A (en) * | 2009-08-07 | 2010-02-03 | 广东昭信光电科技有限公司 | Direct type backlighting system |
| CN101660706A (en) * | 2008-12-31 | 2010-03-03 | 广东昭信光电科技有限公司 | LED lens for realizing light beam control |
| CN101782203A (en) * | 2010-02-04 | 2010-07-21 | 广东昭信光电科技有限公司 | Backlight system containing free-form surface reflector |
-
2011
- 2011-12-12 CN CN2011104118901A patent/CN103162165A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660706A (en) * | 2008-12-31 | 2010-03-03 | 广东昭信光电科技有限公司 | LED lens for realizing light beam control |
| CN101639181A (en) * | 2009-08-07 | 2010-02-03 | 广东昭信光电科技有限公司 | Direct type backlighting system |
| CN101782203A (en) * | 2010-02-04 | 2010-07-21 | 广东昭信光电科技有限公司 | Backlight system containing free-form surface reflector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154494A (en) * | 2014-07-09 | 2014-11-19 | 华南理工大学 | Free-form surface optical lens for ultrathin straight down type LED backlight system |
| WO2016004724A1 (en) * | 2014-07-09 | 2016-01-14 | 华南理工大学 | Free-form curved surface optical lens of ultrathin direct led backlight system |
| CN104534365A (en) * | 2015-01-04 | 2015-04-22 | 赵立地 | Direct type backlight module light bar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7474464B2 (en) | Diffuser plate with higher light diffusion efficiency and brightness | |
| CN100406996C (en) | Illuminating device for display device | |
| EP2458430A1 (en) | Backlight unit and display apparatus using the same | |
| CN104216167B (en) | Liquid crystal display device | |
| CN201502963U (en) | LED backlight module with light guide plate | |
| US20070147079A1 (en) | Backlight module with multiple light sources | |
| CN101782203B (en) | Backlight system containing free-form surface reflector | |
| CN105700233A (en) | Backlight module and liquid crystal display device | |
| CN202229028U (en) | Backlight module and LCD | |
| CN104238182A (en) | Liquid crystal display device | |
| CN103244875A (en) | Display backlight structure with nano metal grating | |
| CN101526692A (en) | Side-light type back light | |
| CN111727403B (en) | Direct type backlight source, manufacturing method thereof and display device | |
| TW200407628A (en) | Liquid-crystal display device and method of fabricating same | |
| US20110026248A1 (en) | Multi-layer lighting unit with improved properties and its use | |
| CN105242457A (en) | Light guide device with high color saturation | |
| CN102644890A (en) | Narrow-frame backlight module | |
| CN103345088A (en) | Direct lighting liquid crystal module and liquid crystal display device | |
| Lin et al. | Optical film with microstructures array for slim-type backlight applications | |
| TW201037416A (en) | Backlight module | |
| CN103912846A (en) | Backlight lens and direct-lit backlight module with same | |
| CN102591067A (en) | Liquid crystal display device | |
| CN100595649C (en) | Lcd backlight source | |
| CN104238183A (en) | Liquid crystal display device | |
| CN101476696A (en) | Backlight module and two-sided LCD device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130619 |