CN103728688A - Preparation method of light guide plate, light guide plate, backlight module and display device - Google Patents
Preparation method of light guide plate, light guide plate, backlight module and display device Download PDFInfo
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- CN103728688A CN103728688A CN201310737838.4A CN201310737838A CN103728688A CN 103728688 A CN103728688 A CN 103728688A CN 201310737838 A CN201310737838 A CN 201310737838A CN 103728688 A CN103728688 A CN 103728688A
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Abstract
The embodiment of the invention discloses a preparation method of a light guide plate, the light guide plate, a backlight module and a display device, and relates to the field of display. The preparation method of the light guide plate, the light guide plate, the backlight module and the display device can effectively improve bad yellowing of a back light source and improve the brightness and evenness of outgoing light of the light guide plate. The preparation method of the light guide plate comprises the steps that the light guide plate with fine adjusting lattice points on the bottom face is formed by adopting an injection molding mode, and the bottom face is opposite to a light outgoing surface of the light guide plate; on the bottom face of the light guide plate, rough adjusting lattice points are prepared through an ink printing forming mode by using ink mingled with blue dyestuff, and the average size of the rough adjusting lattice points is larger than that of the fine adjusting lattice points.
Description
Technical field
The present invention relates to demonstration field, relate in particular to a kind of preparation method and light guide plate, backlight module and display device of light guide plate.
Background technology
Light guide plate is one of key part and component of backlight module, first forms the acryl plates (or sheet material of other material) of optical grade during preparation, and then on the bottom surface of acryl plates, uses ultraviolet screen printing technology to stamp light guiding points.The light that light source sends enters acrylic board transmission therein by incidence surface, and when being mapped to each light guiding points, reflected light can spread to all angles, then by the exiting surface of light guide plate, is penetrated.By the optimal design of the density to light guiding points, size, can make the exiting surface of light guide plate obtain the emergent light of high brightness and homogeneous briliancy.
Above adopt the light guiding points that ultraviolet screen printing technology is made to be called again site, herein the following unified site that is referred to as.Because of typography restriction, it is very little that site size can not be done, and dot density is also less, therefore easily causes picture inequality, and exiting surface brightness is low.Site in the light guide plate of present middle-size and small-size product generally generates by the mode of injection mo(u)lding.
At present, because of the market demand, the backlight module of a lot of panel computers and mobile phone need to adopt minor face light inlet.At this moment for reducing optical design difficulty, when light guide plate is prepared in injection mo(u)lding, the general minor face that adopts enters glue, but adopt minor face while entering glue because the preparation flow of former material in ejection formation (a kind of injection molding forming method: the plastics of fusing are ejected to automatic moulding after mould by plastics spraying machine) process is longer, the duration of contact of light guide plate and die material is more of a specified duration, material degree of carbonization also relatively short side to enter the mode of glue serious, light is propagated the former material through charing like this, impact on Illuminant chromaticity is larger, causes the picture jaundice of a side relative with light inlet side.
Existing solution comprises the light guide panel material of selecting good fluidity, adopt high-speed injection molding machine, and adopt diamond to get mode ready and make light guiding board mould core etc., but it is bad that these methods all can only alleviate yellow to a certain extent, and it is limited to alleviate effect with the increase of backlight module size, the bad problem of yellow can not be solved at all.
Summary of the invention
Embodiments of the invention provide a kind of preparation method and light guide plate, backlight module and display device of light guide plate, and the yellow that can effectively improve backlight is bad, promote brightness and the uniformity coefficient of light guide plate emergent light.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A preparation method for light guide plate, comprising:
Adopt the light guide plate with fine setting site on injection molding formation bottom surface, described bottom surface is relative with the exiting surface of described light guide plate;
On the bottom surface of described light guide plate, use the ink doped with blue dyes, by ink printing molding mode, prepare coarse adjustment site, the average-size of described coarse adjustment site is greater than the average-size of described fine setting site.
Alternatively, described injection molding, is specially: injection molding method.
Preferably, when described employing injection molding forms on bottom surface with the light guide plate of fine setting site, the mould of use comprises: diamond is got the light guiding board mould core that mode is made ready.
The present embodiment also provides a kind of light guide plate, and described light guide plate is provided with on the bottom surface relative with the exiting surface of light guide plate:
The fine setting site that adopts injection molding to form;
Use is doped with the ink of blue dyes, the coarse adjustment site forming by ink printing molding mode, and the average-size of described coarse adjustment site is greater than the average-size of described fine setting site.
Alternatively, described fine setting site adopts injection molding method to form.
The present embodiment also provides a kind of backlight module, comprising: the light guide plate described in any one.
The present embodiment also provides a kind of display device, comprising: described backlight module.
The preparation method of the light guide plate that the embodiment of the present invention provides and light guide plate, backlight module and display device, light guide plate mesh point is divided into fine setting site and coarse adjustment site by size, during preparation, first adopts injection molding synchronously to form the fine setting site on light guide plate and bottom surface of light guide plate; Adopt again ink printing molding mode on the bottom surface of light guide plate, to prepare coarse adjustment site.The site that injection mo(u)lding forms is fine setting light action, size is less, on mould, the degree of depth and the size of corresponding site are all less, the flow velocity of light guide panel material when this contributes to increase injection mo(u)lding, thereby the preparation flow of former material while reducing moulding, reduced the duration of contact of light guide plate and die material, thereby reduce former material yellow, the yellow that effectively improves backlight is bad; And, while preparing coarse adjustment site on the bottom surface of light guide plate, what adopt is the ink doped with blue dyes, the light that light source sends is when the coarse adjustment site of making by these blue dyess, part long wave is absorbed and makes light become blue, can compensate the yellow because causing in injection moulding process, if further the colourity to the blue dyes mixing in ink and incorporation are optimized, can thoroughly eliminate the yellow causing because of former material yellow bad, promote brightness and the uniformity coefficient of light guide plate emergent light.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, will the accompanying drawing of required use in embodiment be briefly described below.
Preparation method's process flow diagram of the light guide plate that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 be in the embodiment of the present invention, adopt injection molding method form bottom surface on fine setting site light guide plate;
Fig. 3 is the microstructure schematic diagram of light guiding board mould core in the embodiment of the present invention;
Fig. 4 be in the embodiment of the present invention after ink printing moulding the bottom surface structure schematic diagram of light guide plate.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making all other embodiment that obtain under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment
The embodiment of the present invention provides a kind of preparation method of light guide plate, and as shown in Figure 1, the method comprises:
101, adopt the light guide plate with fine setting site on injection molding formation bottom surface, described bottom surface is relative with the exiting surface of described light guide plate;
Site in light guide plate is the principal element that affects light quality, and therefore net-pont design is that one in design of backlight module is large crucial.Net-pont design refers to that deviser utilizes corresponding net-pont design software, and in conjunction with the experience of deviser accumulation, and shape to site on bottom surface of light guide plate, size, distribution density, distribution rule etc. are optimized design, make the bright dipping of light guide plate meet product demand.Net-pont design is not implementation focus of the present invention, and with enforcement of the present invention and implementation result also without direct relation, therefore, the present embodiment is not described in detail in this.
During preparation, the present embodiment is divided into fine setting site and coarse adjustment site by light guide plate mesh point by size, the criteria for classifying is generally as the criterion with the minimum print point of printing equipment: be greater than the site on minimum print point, the later stage can print by ink printing molding mode, is divided into coarse adjustment site; The remaining fine setting site that is, can adopt injection molding to synchronize and form with light guide plate, adopts injection molding to form the light guide plate with fine setting site on bottom surface.Wherein, " size " described in the present embodiment refers to the area of site.
Alternatively, injection molding described in this step, specifically can be: injection molding method.Injection molding method is the process of the parts that consist of thermoplastics or thermosetting plastics of a kind of production, particularly, ejection formation is exactly by plastics (being generally polymethylmethacrylate or polycarbonate in the present embodiment) heat fused in the barrel of Jet forming machine, when being flow state. under plunger or screw pressurizing, molten plastic is compressed and move forward, and then the nozzle that passes through barrel front end is with in the close die that very fast speed implantation temperature is lower, after certain hour cooling and shaping, opening mold obtains goods.
Figure 2 shows that adopt injection molding method form light guide plate, in figure left surface for entering light face 11, on bottom surface 12 with fine setting site 13.The light guide plate that relatively existing only ejection formation can be made into, the density of the fine setting site 13 that this step forms is lower, site size also little (site of large-size has been divided into coarse adjustment site), and in light guide plate size, prepare material and equipment all identical in the situation that, site and dot density are less, during moulding, the flow process of material process is shorter, and forming process is shorter, and material yellowing is also lighter.
Shown in Fig. 3, be the microstructure of a kind of light guiding board mould core of using in this step injection molding process, site corresponding on die is of a size of S1, and the site degree of depth is H1; On die, corresponding site is not around smooth but has burr, and burr is of a size of S2, and the burr degree of depth is H2, and material is the arc abcde shown in way from left side through the flow process of each site, and length is made as S
0, while there is no site, the flow process of material is made as S
1, S
0>S
1.
102, on the bottom surface of described light guide plate, use the ink doped with blue dyes, by ink printing molding mode, prepare coarse adjustment site, the average-size of described coarse adjustment site is greater than the average-size of described fine setting site.
On the 12(Gai bottom surface, bottom surface 12 of the light guide plate that this step forms in step 101, be formed with fine setting site 13) on, adopt again ink printing molding mode to prepare coarse adjustment site 14, as shown in Figure 4, intert in coarse adjustment site 14 the fine setting site 13 that injection molding is made.
It should be noted that, the size of the present embodiment to fine setting site 13 and coarse adjustment site 14, the regularity of distribution etc. do not limit, and can be any implementations well-known to those skilled in the art.For example, the spacing between the big or small constant site, coarse adjustment site 14 that the fine setting site 13 that in Fig. 4, injection molding is made and ink printing molding mode form changes, and two kinds of sites are in horizontal and vertical all cross arrangement one to one.Certainly, fine setting site 13 and coarse adjustment site 14 also can all be designed to size variation and spacing is constant, on arranging, can intersect one to one also can to intersect by one-to-many, and interleaved mode be not limited to horizontal and vertical also can circulating type.
Simple oil ink print site is because of its process technology limit, it is very little that the size of site can not be done, under the widely used background of undersized backlight module (in the personal digital products such as computer, mobile phone), if only adopt ink printing, because site size conference makes liquid crystal module picture coarse, cause picture inequality, and ink printing dot density is less, also can causes exiting surface brightness lower; And the remaining space of ink printing, because its size is less, can effectively be filled in the fine setting site that injection molding is made, improve uniformity coefficient and the brightness of exiting surface.
When this example is prepared coarse adjustment site on the bottom surface of light guide plate, employing be the ink doped with blue dyes.In the ink of printing coarse adjustment site, mix blue dyes, the light that light source sends part long wave when by these blue dyess is absorbed and makes light become blue, can compensate the yellow because causing in injection moulding process.On the basis of preparation method described in the present embodiment, constantly the colourity of mixing blue dyes in ink and incorporation etc. are optimized by experiment, can thoroughly eliminate the yellow causing because of former material yellow bad.
In addition, it should be noted that, solve the bad method of yellow and also have: select the light guide panel material of good fluidity, adopt high-speed injection molding machine, and adopting diamond to get mode ready and make light guiding board mould core etc., the light guide plate preparation method described in the embodiment of the present invention does not get rid of being suitable for of these methods.On the light guide plate preparation method basis described in the embodiment of the present invention, above-mentioned one or more that enumerate in method of optional use, improve yellow bad jointly.For example, preferably, while adopting injection molding to form on bottom surface the light guide plate with fine setting site in step 102, the mould of use comprises: diamond is got the light guiding board mould core that mode is made ready.
In sum, the preparation method of the light guide plate that the embodiment of the present invention provides, light guide plate mesh point is divided into fine setting site and coarse adjustment site by size, fine setting site adopts injection molding to synchronize and form with light guide plate, and coarse adjustment site adopts doped with the ink printing molding mode of blue dyes and forms.The site forming because of injection mo(u)lding is fine setting light action, and size is less, and on mould, the degree of depth and the size of corresponding site are all less, can reduce former material yellowing, and the yellow that effectively improves backlight is bad; Meanwhile, in the ink of printing coarse adjustment site, mix blue dyes, light is colored through out-of-date, thus the yellow of compensation because causing in injection moulding process, and the yellow that can further improve backlight is bad.
The present embodiment also provides a kind of light guide plate, and as shown in Figure 4, light guide plate is provided with on the bottom surface relative with the exiting surface of light guide plate 12:
The fine setting site 13 that adopts injection molding to form;
Use is doped with the ink of blue dyes, the coarse adjustment site 14 forming by ink printing molding mode, and the average-size of coarse adjustment site 14 is greater than the average-size of finely tuning site 13.
The light guide plate that the embodiment of the present invention provides, its bottom surface is provided with the fine setting site that injection molding forms, and the coarse adjustment site forming doped with the ink printing of blue dyes, fine setting site is fine setting light action, and size is less, can reduce injection molding process Central Plains material yellowing, the yellow that effectively improves backlight is bad, blue dyes in coarse adjustment site makes light be colored through out-of-date, thus the yellow of compensation because causing in injection moulding process, and the yellow that can further improve backlight is bad.Coarse adjustment site and fine setting site mix and match are in order to promote uniformity coefficient and the brightness of light guide plate emergent light.
Wherein alternatively, described fine setting site 13 adopts injection molding method to form.
The light guide plate that the embodiment of the present invention provides, the yellowing of former material reduces, and emergent light is even simultaneously, and brightness is high; And the light guide plate that inventive embodiments provides, forms because coarse adjustment site adopts the ink printing that mixes blue dyes, light, through out-of-date generation wavelength blue shift, can compensate the yellow because causing in injection moulding process, thereby can fundamentally solve the bad problem of backlight yellow.
The present embodiment also provides a kind of backlight module, comprising: the light guide plate described in the present embodiment any one.
Backlight module is one of key part and component of liquid crystal indicator, and because liquid crystal itself is not luminous, the major function of backlight module is as liquid crystal panel provides evenly, the luminophor of high brightness.The backlight module that the embodiment of the present invention provides, because having adopted the light guide plate described in the present embodiment, emergent light is even, and brightness is high, has solved the bad problem of backlight yellow causing because of former material yellow.Described backlight module is except being applied in liquid crystal TV set, liquid crystal display device, and can also be applied in digital album (digital photo frame), Electronic Paper, mobile phone etc. needs in display device backlight.
The present embodiment also provides a kind of display device, comprising: the backlight module described in the embodiment of the present invention.Described display device can be: any product or parts with Presentation Function such as liquid crystal panel, Electronic Paper, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, each embodiment stresses is and the difference of other embodiment.Especially, for apparatus embodiments, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (7)
1. a preparation method for light guide plate, is characterized in that, comprising:
Adopt the light guide plate with fine setting site on injection molding formation bottom surface, described bottom surface is relative with the exiting surface of described light guide plate;
On the bottom surface of described light guide plate, use the ink doped with blue dyes, by ink printing molding mode, prepare coarse adjustment site, the average-size of described coarse adjustment site is greater than the average-size of described fine setting site.
2. method according to claim 1, is characterized in that, described injection molding, is specially: injection molding method.
3. method according to claim 1 and 2, is characterized in that, when described employing injection molding forms on bottom surface with the light guide plate of fine setting site, the mould of use comprises: diamond is got the light guiding board mould core that mode is made ready.
4. a light guide plate, is characterized in that, described light guide plate is provided with on the bottom surface relative with the exiting surface of light guide plate:
The fine setting site that adopts injection molding to form;
Use is doped with the ink of blue dyes, the coarse adjustment site forming by ink printing molding mode, and the average-size of described coarse adjustment site is greater than the average-size of described fine setting site.
5. light guide plate according to claim 5, is characterized in that, described fine setting site adopts injection molding method to form.
6. a backlight module, is characterized in that, comprising: the light guide plate described in claim 4 or 5.
7. a display device, is characterized in that, comprising: backlight module claimed in claim 6.
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| CN201310737838.4A CN103728688B (en) | 2013-12-27 | 2013-12-27 | The preparation method of light guide plate and light guide plate, backlight module and display device |
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| CN201310737838.4A CN103728688B (en) | 2013-12-27 | 2013-12-27 | The preparation method of light guide plate and light guide plate, backlight module and display device |
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| CN103728688B CN103728688B (en) | 2016-01-13 |
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Cited By (5)
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| CN106019463A (en) * | 2016-07-28 | 2016-10-12 | 广州创维平面显示科技有限公司 | Composite net dot light guide plate and manufacturing method thereof, backlight module and liquid crystal displayer |
| CN106019460A (en) * | 2016-07-12 | 2016-10-12 | 广州创维平面显示科技有限公司 | Light guide plate, backlight module and display device |
| CN106371165A (en) * | 2015-07-22 | 2017-02-01 | 扬升照明股份有限公司 | Method for manufacturing light guide plate |
| CN109725464A (en) * | 2019-03-15 | 2019-05-07 | 四川长虹电器股份有限公司 | Straight downside enters the liquid crystal module group backlight display device of combination |
| CN113189693A (en) * | 2021-04-10 | 2021-07-30 | 广东东华光电科技有限公司 | Light guide plate and processing method thereof |
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| CN103728688B (en) | 2016-01-13 |
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