CN103235352A - Optical thin film and direct type backlight module - Google Patents
Optical thin film and direct type backlight module Download PDFInfo
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- CN103235352A CN103235352A CN2013101179160A CN201310117916A CN103235352A CN 103235352 A CN103235352 A CN 103235352A CN 2013101179160 A CN2013101179160 A CN 2013101179160A CN 201310117916 A CN201310117916 A CN 201310117916A CN 103235352 A CN103235352 A CN 103235352A
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Abstract
The invention provides an optical thin film applied to a direct type backlight module. The direct type backlight module comprises a backlight cavity, an LED and a diffusion board, wherein the LED and the diffusion board are disposed outside the backlight cavity. The optical thin film is located between the diffusion board and the LED and used for transmitting part of light emitted by the LED to the diffusion board and reflecting the other part of light back into the backlight cavity. The invention further provides the direct type backlight module. The optical thin film is capable of reducing light mixing distance and avoiding mura, and low in cost.
Description
Technical field
The present invention relates to field of liquid crystal display, relate in particular to a kind of optical thin film and have the down straight aphototropism mode set of this optical thin film.
Background technology
As everyone knows, down straight aphototropism mode set has homogeneity higher (particularly large scale), the easier control adjustment of regional area, has more cinch advantage such as cheap on high-contrast and wide viewing angle and the cost with respect to side entering type.Under the more and more important prerequisite of current cost factor, down straight aphototropism mode set has had the one seat of oneself gradually, and the trend that has occupation rate to catch up with gradually.But because the down straight aphototropism mode set shortcoming is that light mixing distance is big, that can not do is very thin, makes complete machine can't accomplish as attractive in appearance as the side entrance back module.
There are some schemes that can do down straight aphototropism mode set thinner in prior art, and for example a kind of is to add secondary optical lens at led light source, and method such as cloth site reduces light mixing distance on diffuser plate; Another namely is by not adding lens, use the method for more led light source, improving (being commonly called as the babysbreath method) with the spacing that reduces between LED.But above method all can not well solve the not enough mura(spot that produces of mixed light) problem: for example add secondary optical lens, because design and technologic restriction, the H/P(mixed light that present secondary optical lens can satisfy and the ratio of LED spacing) probably about 0.25, if realize again the lens design of low H/P, then also there is certain difficulty.In addition, because diffuser plate passes through the typography moulding, the mixed light that can not only reduce is limited, simultaneously because the printing ink factor of using also may cause subjectivity that mura is arranged on colourity.And the babysbreath rule is to reach the purpose that reduces mixed light by increasing the LED number, can not accomplish very economical on cost.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of optical thin film, is intended to reduce the cost that reduces light mixing distance.
To achieve these goals, the invention provides a kind of optical thin film, be applied in the down straight aphototropism mode set, this down straight aphototropism mode set comprises cavity backlight and is arranged on the external LED of backlight cavities and diffuser plate, described optical thin film is between the diffuser plate and LED of down straight aphototropism mode set, comprise transparent substrates and the plated film of one deck at least layer that covers on the transparent substrates, a light part that is used for LED is sent is transmitted through diffuser plate, in another part reflected back cavity backlight.
Preferably, the optical thickness of every layer on described plated film layer is 1/4 odd-multiple of optical wavelength.
Preferably, the material of described transparent substrates comprises: PE film, PET film or PMMA film.
Preferably, described optical thin film is several, and array is distributed on the diffuser plate.
Preferably, whole of described optical thin film covers on the described diffuser plate.
The present invention also provides a kind of down straight aphototropism mode set, comprise cavity backlight and be arranged on the external LED of backlight cavities and diffuser plate, it also comprises at the diffuser plate of down straight aphototropism mode set and the optical thin film between the LED, this optical thin film comprises transparent substrates and the plated film of one deck at least layer that covers on the transparent substrates, a light part that is used for LED is sent is transmitted through diffuser plate, in another part reflected back cavity backlight.
The present invention also provides a kind of type backlight module, comprise cavity backlight and be arranged on the external LED of backlight cavities and diffuser plate, described diffuser plate and LED facing surfaces are coated with optical thin film, this optical thin film comprises transparent substrates and the plated film of one deck at least layer that covers on the transparent substrates, a light part that is used for LED is sent is transmitted through diffuser plate, in another part reflected back cavity backlight.
The present invention is by arranging optical thin film between the diffuser plate in down straight aphototropism mode set and the LED, the light that LED is sent, and a part sees through this optical thin film, and a part is by this optical thin film reflected back cavity backlight in addition.Because light luminous energy maximum on upward direction of sending of LED, thus by adding that this layer optical thin film can effectively stop a large amount of light that makes progress to see through diffuser plate, avoid causing subjective LED top bright, dark situation all around.In addition, the just preceding light of most of LED is reflected back toward cavity, breaks up by the cloudy surface reflection of end reflector plate, is utilized again.Because the cloudy surface reflecting effect of end reflector plate, more light is through repeatedly can seeing through from the zone between the LED after the reflection, as long as rationally adjust reflectivity and the transmitance of this optical thin film, can reach the luminous effect of even back, thereby reach the purpose that reduces light mixing distance and avoid mura.Because the material cost of optical thin film is very cheap, prior art has reduced the cost that reduces light mixing distance relatively.
Description of drawings
Fig. 1 is the structural representation of down straight aphototropism mode set in one embodiment of the invention;
Fig. 2 is the light path synoptic diagram of down straight aphototropism mode set in one embodiment of the invention;
Fig. 3 is the structural representation of optical thin film in one embodiment of the invention;
Fig. 4 is the fundamental diagram of optical thin film in one embodiment of the invention;
Fig. 5 is the assembly structure synoptic diagram of down straight aphototropism mode set in one embodiment of the invention;
Fig. 6 is the assembly structure synoptic diagram of down straight aphototropism mode set in another embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Be the structural representation of down straight aphototropism mode set in one embodiment of the invention referring to figs. 1 through 4, Fig. 1; Fig. 2 is the light path synoptic diagram of down straight aphototropism mode set in one embodiment of the invention; Fig. 3 is the structural representation of optical thin film in one embodiment of the invention; Fig. 4 is the fundamental diagram of optical thin film in one embodiment of the invention.Optical thin film 40 in the embodiment of the invention is applied in the down straight aphototropism mode set, this down straight aphototropism mode set comprises cavity 10 backlight and the LED20 and the diffuser plate 30 that are arranged on outside the cavity 10 backlight, described optical thin film 40 is between the diffuser plate 30 and LED20 of down straight aphototropism mode set, this optical thin film 40 comprises transparent substrates 41 and covers the transparent 41 suprabasil plated film of one deck at least layers 42, a light part that is used for LED20 is sent is transmitted through diffuser plate 30, in another part reflected back cavity 10 backlight.
As depicted in figs. 1 and 2, in the embodiment of the invention, down straight aphototropism mode set also comprises end reflector plate 60 and is arranged on blooming pieces such as increment film 50 on the diffuser plate 30.LED20 is white light LEDs, or red, green, and primary colors LED need not to paste secondary optical lens on the LED20.Light sends from LED20, and at first through the optical thin film 40 of specific reflectance and transmitance is arranged, by reflection law and refraction law, a part of light sees through from optical thin film 40, arrives diffuser plate 30 places, upper strata; Another part light by 60 reflections of end reflector plate, through several secondary reflections and transmission process, makes the subjective luminance homogeneity reach requirement at optical thin film 40 place's reflected backs cavity 10 backlight again gradually.
In the embodiment of the invention, optical thin film 40 comprises transparent substrates 41 and covers the transparent 41 suprabasil plated film of one deck at least layers 42, transparent substrates 41 and at least one deck plated film layer 42 can obtain specific reflectivity and transmitance.For example, on the manufacture craft of optical thin film 40, can use PE, PET film or PMMA film as substrate 41, modes such as employing vacuum evaporation are made and (for example can be adopted optically coated mode, be not limited only to the evaporation mode, also can adopt to comprise as plated film modes such as ion plating, magnetic control sputtering platings) plated film layer 42.Purpose is this optical thin film of light process that LED is sent, and only allows a part of light see through optical thin film 40, and quite a few is by these optical thin film 40 reflections in addition.
The reflectivity of this optical thin film 40 can be got by following derivation:
As shown in Figure 4: being one is n in refractive index
GSubstrate 41 on the optical thin film figure that forms after the plated film, wherein the monofilm refractive index that plates with the evaporation mode is n, the reflectivity R of whole optical thin film under normal incidence is:
Wherein can control the reflectivity of whole transparent optical film by the material refractive index n (namely selecting different plated film materials for use) of adjusting the film plating, same, ignore the part of absorption, reflectivity+transmissivity=1.
Actual plated film all is plating multilayer film, evaporation tens or tunic up to a hundred as required basically.After measuring equivalent refractive index by testing tool, carry out iteration by following formula, finally can calculate reflectivity and the transmitance of transparent optical film under the plating multilayer film.Also can be designed to every layer thickness 1/4 film (being that the optical thickness of rete is 1/4 odd-multiple of certain optical wavelength), can obtain equivalent refractive index and be by calculating
Further the substitution following formula carries out iteration again.
Coating technique now is very ripe, can come the transparent optical film after the processing is carried out the measurement of reflectivity and transmitance and equivalent refractive index etc. by some instruments.And then further adjust reflectivity and transmitance by the number of plies and the plated film material of adjusting plated film.
Should be noted that, in the embodiment of the invention, the reflectivity of above-mentioned optical thin film 40 and transmitance can determine according to actual conditions, for example: if subjectively show still regional bright than between the LED of LED top, then increase the reflectivity of this optical thin film, reduce its transmitance; If homogeneity is fine, but brightness lose, then can consider to increase the transmitance of this optical thin film 40, reduce its reflectivity.
In the module backlight that the present invention relates to, light upwards sends from LED20, through the optical thin film 40 between diffuser plate and the LED20, because this optical thin film 40 has specific reflectivity and transmitance, so, only some has reached diffuser plate 30 to the light that sends from LED20, greatly then via in these optical thin film 40 reflected backs cavity 10 backlight.Because light luminous energy maximum on upward direction of sending of LED20, thus by adding that this layer optical thin film 40 can effectively stop a large amount of light that makes progress to see through diffuser plate 30, cause subjective LED top bright, dark situation all around.The just preceding light of most of LED20 is reflected back toward cavity backlight 10, cloudy surface reflection by end reflector plate 60 is broken up, again be utilized. because the cloudy surface reflecting effect of end reflector plate 60, more light is through repeatedly can seeing through from the zone between the LED after the reflection, as long as rationally adjust reflectivity and the transmitance of this transparent optical film, can reach the luminous effect of even back.Thereby reach the purpose that reduces mixed light and avoid mura.
In the embodiment of the invention, arrange and the fixed form of optical thin film 40 has multiple, can according to circumstances select flexibly.Referring to shown in Figure 5, in one embodiment of the invention, 40 whole of optical thin films can be covered on the described diffuser plate 30.Referring to shown in Figure 6, in another embodiment of the present invention, optical thin film 40 is several, and array is distributed on the diffuser plate 30.In the embodiment of the invention, because the light that LED20 upwards sends is the closer to LED20 light-emitting area normal, its intensity is more high, then according to actual conditions transparent optical film 40 is designed to Xiao Zhang, attaches or apply a part of regional downside directly over the LED20 of being positioned at of diffuser plate 30.For the little light of emission angle, earlier through the optical thin film 40 of diffuser plate 30 downsides, wherein quite a few light is reflected back toward cavity and is utilized again in the time of through diffuser plate 30; And for the big light of emission angle, without the optical thin film 40 of diffuser plate 30 downsides, then most of light see through diffuser plate 30 and send in the time of through diffuser plate 30, can reach like this to make subjective effect uniformly.
The present invention also provides a kind of down straight aphototropism mode set, this down straight aphototropism mode set is the down straight aphototropism mode set of explaining in the previous embodiment, for example, it comprises cavity 10 backlight and the LED20 and the diffuser plate 30 that are arranged on outside the cavity 10 backlight, described optical thin film 40 is between the diffuser plate 30 and LED20 of down straight aphototropism mode set, comprise transparent substrates 41 and cover the transparent 41 suprabasil plated film of one deck at least layers 42, a light part that is used for LED20 is sent is transmitted through diffuser plate 30, in another part reflected back cavity 10 backlight.In the embodiment of the invention, the structure of optical thin film 40 and principle of work can not given unnecessary details at this referring to Fig. 1 to Fig. 6 and corresponding embodiment thereof.Owing to be provided with aforementioned optical thin film, down straight aphototropism mode set of the present invention can reach the purpose that reduces light mixing distance and avoid mura.Because the material cost of optical thin film is very cheap, prior art has reduced the cost that reduces light mixing distance relatively.
Further, the present invention also provides a kind of down straight aphototropism mode set, comprises cavity 10 backlight, LED20 and diffuser plate 30.Different with previous embodiment is that in the embodiment of the invention, diffuser plate 30 is coated with aforementioned optical thin film 40 with the LED20 facing surfaces, is transmitted through diffuser plate 30 for the light part that LED20 is sent, in another part reflected back cavity 10 backlight.The embodiment of the invention directly arranges plated film layer 42 at diffuser plate 30, substitutes aforementioned substrates 41 with existing diffuser plate 30, has further reduced cost.
The present invention is not limited to above embodiment, under the disclosed technology contents of above-mentioned embodiment, can also carry out various variations.Every equivalent structure transformation that utilizes instructions of the present invention and accompanying drawing content to do, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. optical thin film, it is characterized in that, be applied in the down straight aphototropism mode set, this down straight aphototropism mode set comprises cavity backlight and is arranged on the external LED of backlight cavities and diffuser plate, described optical thin film is between the diffuser plate and LED of down straight aphototropism mode set, comprise transparent substrates and the plated film of one deck at least layer that covers on the transparent substrates, a light part that is used for LED is sent is transmitted through diffuser plate, in another part reflected back cavity backlight.
2. optical thin film as claimed in claim 1 is characterized in that, the optical thickness that described plated film layer is every layer is 1/4 odd-multiple of optical wavelength.
3. optical thin film as claimed in claim 2 is characterized in that, the material of described transparent substrates comprises: PE film, PET film or PMMA film.
4. as each described optical thin film in the claim 1 to 3, it is characterized in that described optical thin film is several, array is distributed on the diffuser plate.
5. as each described optical thin film in the claim 1 to 3, it is characterized in that whole of described optical thin film covers on the described diffuser plate.
6. down straight aphototropism mode set, comprise cavity backlight and be arranged on the external LED of backlight cavities and diffuser plate, it is characterized in that, also comprise at the diffuser plate of down straight aphototropism mode set and the optical thin film between the LED, comprise transparent substrates and the plated film of one deck at least layer that covers on the transparent substrates, a light part that is used for LED is sent is transmitted through diffuser plate, in another part reflected back cavity backlight.
7. down straight aphototropism mode set as claimed in claim 6 is characterized in that, the optical thickness that described plated film layer is every layer is 1/4 odd-multiple of optical wavelength.
8. down straight aphototropism mode set as claimed in claim 7 is characterized in that, the material of described transparent substrates comprises: PE film, PET film or PMMA film.
9. as each described down straight aphototropism mode set in the claim 6 to 8, it is characterized in that described optical thin film is several, array is distributed on the diffuser plate; Perhaps, whole of described optical thin film covers on the described diffuser plate.
10. down straight aphototropism mode set, comprise cavity backlight and be arranged on the external LED of backlight cavities and diffuser plate, it is characterized in that, described diffuser plate and LED facing surfaces are coated with optical thin film, this optical thin film comprises transparent substrates and the plated film of one deck at least layer that covers on the transparent substrates, a light part that is used for LED is sent is transmitted through diffuser plate, in another part reflected back cavity backlight.
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| CN2013101179160A CN103235352A (en) | 2013-04-07 | 2013-04-07 | Optical thin film and direct type backlight module |
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| CN2013101179160A CN103235352A (en) | 2013-04-07 | 2013-04-07 | Optical thin film and direct type backlight module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103672622A (en) * | 2013-12-20 | 2014-03-26 | 康佳集团股份有限公司 | Backlight module based on double reflectors |
| CN105487150A (en) * | 2016-01-06 | 2016-04-13 | 利亚德光电股份有限公司 | Reflecting mask and LED display device with same |
| WO2017088447A1 (en) * | 2015-11-27 | 2017-06-01 | 乐视控股（北京）有限公司 | Bottom lighting led backlight module and display comprising backlight module |
| CN109037271A (en) * | 2018-08-16 | 2018-12-18 | 京东方科技集团股份有限公司 | Optical device and its manufacturing method, display device |
| CN109407400A (en) * | 2018-11-23 | 2019-03-01 | 深圳Tcl新技术有限公司 | Down straight aphototropism mode set and display equipment |
| CN111051974A (en) * | 2017-09-26 | 2020-04-21 | 苹果公司 | Electronic device having display with direct-lit backlight unit |
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| CN102644883A (en) * | 2011-03-25 | 2012-08-22 | 京东方科技集团股份有限公司 | Direct type backlight source |
| CN202813085U (en) * | 2012-09-14 | 2013-03-20 | 京东方科技集团股份有限公司 | Direct type backlight module and display device |
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| CN1405580A (en) * | 2001-08-07 | 2003-03-26 | 柯尼卡株式会社 | Method for forming semi-transparent reflection mirror film and optical element with said film |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103672622A (en) * | 2013-12-20 | 2014-03-26 | 康佳集团股份有限公司 | Backlight module based on double reflectors |
| CN103672622B (en) * | 2013-12-20 | 2017-12-22 | 康佳集团股份有限公司 | A kind of backlight module based on double mirror |
| WO2017088447A1 (en) * | 2015-11-27 | 2017-06-01 | 乐视控股（北京）有限公司 | Bottom lighting led backlight module and display comprising backlight module |
| CN105487150A (en) * | 2016-01-06 | 2016-04-13 | 利亚德光电股份有限公司 | Reflecting mask and LED display device with same |
| CN111051974A (en) * | 2017-09-26 | 2020-04-21 | 苹果公司 | Electronic device having display with direct-lit backlight unit |
| CN109037271A (en) * | 2018-08-16 | 2018-12-18 | 京东方科技集团股份有限公司 | Optical device and its manufacturing method, display device |
| US10767833B2 (en) | 2018-08-16 | 2020-09-08 | Hefei Boe Optoelectronics Technology Co, Ltd. | Optical device, method for manufacturing same, and display device |
| CN109037271B (en) * | 2018-08-16 | 2021-10-26 | 京东方科技集团股份有限公司 | Optical device, manufacturing method thereof and display device |
| CN109407400A (en) * | 2018-11-23 | 2019-03-01 | 深圳Tcl新技术有限公司 | Down straight aphototropism mode set and display equipment |
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Effective date of registration: 20160201 Address after: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A block 13-16 Applicant after: Shenzhen Skyworth-RGB Electronics Co., Ltd. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A block 13-16 Applicant before: Skyworth LCD Modules (Shenzhen) Co., Ltd. |
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Application publication date: 20130807 |