CN103818131A - Method for printing ink dots on reflector plate - Google Patents
Method for printing ink dots on reflector plate Download PDFInfo
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- CN103818131A CN103818131A CN201410047466.7A CN201410047466A CN103818131A CN 103818131 A CN103818131 A CN 103818131A CN 201410047466 A CN201410047466 A CN 201410047466A CN 103818131 A CN103818131 A CN 103818131A
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Abstract
The invention discloses a method for printing ink dots on a reflector plate. The method includes, firstly, forming blending ink through adjusting ratio of grey, black and white inks according to the required grayness; secondly, applying printing screen to print the blending ink on the printed dots on the reflector plate; then setting the ink in the dots. The method for printing ink dots on the reflector plate is applied to change local reflection characteristics of the reflector plate, applies reasonable deployment of ink composition to meet the design requirement of the grayness of the printing dots, applies matched printing screen and setting under specific temperature to make sure that the printing dots on the reflector plate is of strong adhesion strength, and can withstand friction, high temperature, and high humidity reliability test. The method overcomes defects of reflector plate warping, unequal printing effect, and the like.
Description
Technical field
The invention belongs to direct-type backlight lighting technical field, specifically, relate to a kind of design that is applied in reflector plate in direct-type backlight illuminating product.
Background technology
Present liquid crystal display product, mainly adopts direct-light type LED backlight technology or side entering-type LED backlight technology to throw light on to liquid crystal panel, to realize the demonstration of picture.
Along with LCD TV product is more and more universal, user is pursuing large-sized while of screen, and the low price of tv product, light weight, slimming also become the object of user's comparison in the time selecting product.At present, for reduce LCD product price, alleviate the complete machine weight of LCD product, the main technological approaches adopting is to select direct-light type LED backlight lighting engineering design backlight module, because this backlight technology can save the LGP parts in side entering-type LED backlight lighting engineering.
Existing direct-light type LED backlight lighting engineering mainly adopts LED to mount lens (lens) as core component, utilizes the dispersion angle of lens expansion LED light source 1 light emitted line, shown in Figure 1., on diffuser plate 3, there is reflection and transmission in the light of launching by LED light source 1 or shine directly on the diffuser plate 3 that is positioned at LED light source 1 dead ahead; Or via being positioned at after reflector plate 2 reflections of LED light source 1 rear and side, be irradiated on diffuser plate 3.Diffuser plate 3 does further after DIFFUSION TREATMENT the light of incident, is irradiated to equably on whole liquid crystal panel 4, realizes the demonstration of picture.
But, this direct-light type LED backlight lighting engineering needs certain light mixing distance D, provided by the air groove 5 forming between LED light source 1 and diffuser plate 3, as shown in Figure 1, arrive diffuser plate 3 with after light is mixed, this has just limited the slimming development of direct-light type LED backlight LCD product again.Although can improve to a certain extent this restriction by changing the shape of lens lens and the manufacture craft of diffuser plate 3, because the spacing of adjacent two LEDs light sources 1 is far away, if significantly dwindle light mixing distance D, its picture display effect will obviously become bad.Therefore,, if think further to dwindle the integral thickness of liquid crystal display product, must find a new way.
Summary of the invention
The object of the present invention is to provide a kind of on reflector plate the method for printing-ink site, by reducing the reflectivity of local reflex sheet, guaranteeing under the prerequisite of illuminating ray homogenising, realize the slimming design of backlight module.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A method for printing-ink site on reflector plate, comprises the following steps:
A, according to the gray scale of designing requirement, the ratio of allotment grey, black, three kinds of ink of white, forms blending ink;
B, use half tone on reflector plate, to need the described blending ink of printing in the site of printed ink;
C, the ink being printed in described site is cured.
For the ink site that makes to print out has scratch resistant performance, in described blending ink, also add and have gloss oil.
For the ink site that makes to print out has dumb light effect, in described blending ink, also add and have delustring ink.
Preferably, at allotment gray ink, black ink, white ink, gloss oil, delustring ink, to form in the process of described blending ink, gray ink accounts for 75% of described blending ink; The summation of black ink and white ink accounts for 20% of described blending ink, and wherein, black ink accounts for 5%-15%, and white ink accounts for 15%-5%; The summation of gloss oil and delustring ink accounts for 5% of described blending ink, and wherein, gloss oil accounts for 2%-3%, and delustring ink accounts for 3%-2%.
Further, in the time making described half tone, the distributing position according to site on reflector plate, blocks the part mesh on half tone, only reserves the corresponding mesh of dot area.
Further, described reflector plate is the reflector plate in direct-light type LED backlight module, described site can be distributed in (being in the spot area on reflector plate and in non-spot area) on the whole reflecting surface of reflector plate, also can only be distributed in by LED light source and project in the spot area that the dispersed light on reflector plate forms.
More even in order to make to reflex to by reflector plate the light intensity of diffuser plate, preferably adopt the reflectivity of zones of different on following two kinds of mode accommodation reflex sheets:
One is, described site is uniformly distributed, the color depth that is printed on the blending ink in each site by adjusting carrys out the reflectivity of accommodation reflex sheet zones of different, and the color of following region that light intensity is higher, blending ink is darker, the more weak region of light intensity, the more shallow rule of color of blending ink.
Another kind is, in each site, print the blending ink of the same color degree of depth, carry out the reflectivity of zones of different on accommodation reflex sheet by the distribution density that regulates site, and it is larger to follow region, dot density that light intensity is higher, the less rule of region, dot density that light intensity is more weak.
During for fear of printing-ink, block the mesh of half tone, cause printing effect inequality, the mesh of described half tone is preferably arranged between 200 order-250 orders.
Preferably, adopt the mode of baking to be cured the ink being printed in described site, baking temperature is arranged between 35 ℃-45 ℃, and baking time was arranged on 3 minutes between-8 minutes.
In order to make the ink site forming there is heavier granular sensation, to strengthen dispersion effect, after described step c, preferably perform step d:
D, use half tone republish one deck frosted ink, and described frosted ink are cured in each dot area.
Compared with prior art, advantage of the present invention and good effect are: the present invention's employing mode of printing-ink site on reflector plate changes the local reflex characteristic of reflector plate, by reasonably allocating ink composition, make the gray scale of printing net-point meet designing requirement, by add gloss oil and delustring ink in ink, and use the half tone of specific standard, through solidifying of specific temperature conditions, thereby making to be printed on printing net-point on reflector plate, to adhere to dynamics strong, difficult drop-off, can stand friction, the reliability test such as hot and humid, and avoid reflector plate warpage, the generation of the unequal bad phenomenon of printing effect.In addition, by secondary printing one deck frosted ink on the reflector plate printing, can strengthen thus dispersion effect, make to reflex to by reflector plate the light intensity homogenising more of diffuser plate.The reflector plate forming is thus applied in the LCD product that adopts the design of direct-light type LED backlight lighting engineering, can be in guaranteeing Uniform Illumination effect, shorten the light mixing distance of light source to diffuser plate, thereby reduce the thickness of backlight module, improve the aesthetics of LCD product machine shape, realize the ultrathin design of LCD product.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is the package assembly schematic diagram of backlight module and liquid crystal panel in LCD product;
Fig. 2 be proposed by the invention on reflector plate the flow chart of a kind of embodiment of printing-ink site method;
Fig. 3 is the structural representation of the wherein a kind of distribution mode of ink site on reflector plate;
Fig. 4 is the partial structurtes schematic diagram of another distribution mode of ink site on reflector plate.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
The present embodiment is for the LCD product that adopts the design of direct-light type LED backlight lighting engineering, proposed a kind of on reflector plate the method for printing-ink site, change the local reflex characteristic of reflector plate by printing-ink site on reflector plate, thereby make to reflex to by reflector plate the light intensity homogenising more of diffuser plate, and then realize LED-backlit source to the prerequisite of liquid crystal panel uniform irradiation under, can make LED light source further shorten to the light mixing distance of diffuser plate, then be conducive to the slimming design of backlight module and even whole LCD product.
For this technology of printing-ink site on reflector plate, whether whether suitable the and ink site of the gray scale of printing net-point can be attached on reflector plate reliably, and difficult drop-off, is the key of net-point printing technology success or failure.The present embodiment is for material, the actual condition of the reflector plate using in backlight module and the reflecting effect that will reach, a kind of brand-new ink dot printing method has been proposed, reasonably allocate by the ink that adopts grey, black, three kinds of colors of white, be difficult for regulating thereby solved ink gray scale, be difficult to the problem of the different designs requirement that meets backlight module; By adopting screen printing technology to need to change in the dot area of reflection characteristic by being in harmonious proportion the ink printing of gray scale, thereby solved the problem of printing effect inequality on reflector plate; By the ink site after printing is toasted, and baking temperature and baking time are reasonably set, thereby have improved the solidification effect of ink site, solved reflector plate easy problem that buckling deformation occurs under high-temperature condition.
Below the concrete operation step of described ink dot printing method is elaborated as follows, shown in Fig. 2:
(1) gray scale needing according to actual design, the ratio of allotment grey, black, three kinds of ink of white, forms blending ink.
Due to the reflection characteristic difference of different backlight module possibility demands, for the gray scale that makes to be printed on the ink site on reflector plate can meet different design requirements, the present embodiment preferably adopts the ink of grey, black, three kinds of colors of white reasonably to allocate, the gray scale needing to reach design.The gray scale showing due to the blending ink forming by grey, black, three kinds of ink of white is different from the gray scale of actual print effect, therefore need to increase and decrease according to actual print effect the ratio of three kinds of ink.For example: can, using gray ink as basis (being main materials), add appropriate black and white ink in gray ink, the if desired darker printing effect of gray scale, can increase the consumption of black ink, reduces the consumption of white ink; If desired the more shallow printing effect of gray scale, can reduce the consumption of black ink, suitably increases the ratio of white ink.
In the ink dot printing method proposing at the present embodiment, for the ink site that makes to print has the characteristic of the scratch of preventing, the present embodiment preferably further adds gloss oil being in harmonious proportion in the ink of gray scale, by reasonably setting the adding proportion of gloss oil, so that the ink site forming has scratch resistant effect.
Described gloss oil is a kind of synthetic resin, now typically refer to the transparent varnish in surface, made by base-material and auxiliary agent etc., not containing any pigment, glossy shinny after film forming, be also commonly called as varnish the TPE-010A gloss oil that such as Suzhou is color and ink company produces etc., can be used for adding to and be in harmonious proportion in the ink of gray scale, to strengthen the scratch resistant effect of ink site.
In addition,, for the ink site that makes to print has dumb light effect, the present embodiment can also be being in harmonious proportion the further delustring ink that adds in the ink of gray scale, to reach extinction effect.For example: can select Degussa delustring ink OK412 as additive, form required blending ink.
A kind of optimum ratio relation as each composition in described blending ink: the consumption of gray ink can account for 75% of whole blending ink; Total consumption of black ink and white ink can account for 20% of whole blending ink; Total consumption of gloss oil and delustring ink can account for 5% of whole blending ink.
Wherein, black ink can account for the 5%-15% of blending ink total amount, and white ink can account for the 15%-5% of blending ink total amount, specifically can determine according to the required gray scale of actual design the concrete consumption of black, these two kinds of color inks of white.For example: the if desired darker printing effect of gray scale, can increase the consumption of black ink, reduce the consumption of white ink, as use 15% black ink to coordinate 5% white ink, to increase the degree of depth of blending ink; If desired the more shallow printing effect of gray scale, can reduce the consumption of black ink, increases the consumption of white ink, as uses 5% black ink to coordinate 15% white ink, so that the degree of depth of the final blending ink forming shoals.
For the consumption of gloss oil and delustring ink, gloss oil can account for the 2%-3% of whole blending ink total amount, and delustring ink can account for the 3%-2% of whole blending ink total amount.As the preferred design of one, can in the ink of gray scale, add 3% gloss oil and 2% delustring ink being in harmonious proportion, so that the ink site being finally formed on reflector plate has comparatively desirable scratch resistant and extinction effect.
(2) on reflector plate, determine the network point distribution that needs printing-ink.
In direct-light type LED backlight module; reflector plate 2 is all mounted on backboard 6; backboard 6 plays the effect of supporting and protecting internal components; generally include bottom surface 6-1 and surrounding side 6-2; shown in Fig. 1, Fig. 3; reflector plate 2 is covered with the inner surface of whole backboard 6, for the 1 point of disperse light that is mapped to rear and surrounding of LED light source being arranged on backboard 6 bottom surface 6-1 is fully reflected, to improve light emission rate.
In order to improve illumination intensity, in the bottom surface of backboard 6,6-1 need to lay plurality of LEDs light source 1, and plurality of LEDs light source 1 is arranged in to matrix array form, and is substantially covered with the bottom surface 6-1 of whole backboard 6, as shown in Figure 3, so that the light that can be enough to meet liquid crystal panel 4 brightness of illumination demands to be provided.
The characteristics of luminescence according to LED light source 1: the center of distance L ED light source 1 is nearer, the intensity of light is larger; The center of distance L ED light source 1 is far away, and the intensity of light is more weak.In the time of the negligible amounts of the LED light source 1 of laying in backlight module, the spacing between two LEDs light sources 1 will become large.The light of launching by LED light source 1, owing to there is the problem of lighting angle, a part of light shines directly on diffuser plate 3, and a part of ray cast is to the reflector plate 2 of rear and surrounding side, carry out once or after multiple reflections the diffuser plate 3 described in final directive via reflector plate 2.
Due on reflector plate 2, the light that the nearer echo area (being echo area, low beam place) of distance L ED light source 1 is reflected is mainly radiated on the diffuser plate 3 directly over LED light source 1, reflection characteristic is better, and the light that this place's diffuser plate 3 receives is stronger, more easily occurs lamp shadow problem; Mainly be radiated at the marginal position of diffuser plate 3 by the light of reflector plate 2 edge reflector space reflections, reflection characteristic is better, the light that this place's diffuser plate 3 receives is stronger, more easily occurs picture " lantern " phenomenon, thereby is having a strong impact on the display effect of LCD product.
In order to solve lamp shadow problem, the present embodiment adopts the mode of printing net-point 7 on reflector plate 2 to carry out part to the reflection characteristic of reflector plate 2 and revises, project the intensity difference of the disperse light of zones of different on reflector plate 2 according to LED light source 1, by reasonably configuring the distribution density of site 7 in zones of different or the degree of depth of site 7 interior printed ink, change the reflectivity of zones of different on reflector plate 2, and then reduce the gap between the light intensity of zones of different reflection, the light reflecting by reflector plate 2 can be irradiated on diffuser plate 3 equably, through the diffusion sheet in diffuser plate 3 and prismatic lens respectively the light of incident is spread and incremental processing after, realize the uniform irradiation to liquid crystal panel 4.
Concrete distribution for site 7 on reflector plate 2, can adopt in two ways: a kind of is that site 7 is only distributed in the spot area on reflector plate 2, be that the dispersed light that LED light source 1 sends projects the stronger speck region of macroscopic brightness forming on reflector plate 2, as shown in Figure 3; Another kind is that site 7 is distributed on the whole reflecting surface of reflector plate 2, disperses to be covered with the reflecting surface of whole reflector plate 2, has both comprised spot area, also comprises non-spot area, as shown in Figure 4.
Because LED light source 1 is incident upon the intensity difference of the disperse light of zones of different on reflector plate 2, substantially suitable in order to make to reflex to by the regional of reflector plate 2 light intensity of diffuser plate 3, then make the received light intensity homogenising of whole diffuser plate 3, the present embodiment is revised targetedly to the reflection characteristic of zones of different on reflector plate 2, by changing the reflectivity of zones of different on reflector plate 2, so that the light intensity reflecting by reflector plate 2 is tending towards even.
In order to revise the reflection characteristic of zones of different on reflector plate 2, the present embodiment proposes the alter mode of following two kinds of reflectivity:
The first, the described site 7(that needs to arrange equably in the region of printing net-point on reflector plate 2 had both comprised the situation of the described site 7 of only evenly arranging in spot area, be also included within the situation of the described site 7 of evenly arranging on the reflecting surface of whole reflector plate 2), the color depth that is printed on the blending ink in each site 7 by adjusting carrys out the reflectivity of accommodation reflex sheet 2 zoness of different, and the color of following region that light intensity is higher, blending ink is darker, the more weak region of light intensity, the more shallow rule of color of blending ink.
It two is, in each site 7, print the blending ink of the same color degree of depth, carry out the reflectivity of zones of different on accommodation reflex sheet 2 by regulating the distribution density of site 7 in zones of different, and it is larger to follow region, dot density that light intensity is higher, the less rule of region, dot density that light intensity is more weak, shown in Fig. 3, Fig. 4.
(3) according to the network point distribution of determining, make specific half tone, and use described half tone in each 7 region, site, to print described blending ink.
In the present embodiment, 7 decision design of described site are circular, its diameter is preferably arranged on 0.5mm left and right, print described blending ink in each site 7 time, the mesh number of the half tone using is the parameter that needs emphasis to consider, for fear of printing plug net under high order number, cause the problem of printing effect inequality to occur, the present embodiment preferably arranges the mesh number of half tone between 200 order-250 orders, be to be provided with 200-250 mesh in the silk screen length of each inch, that is to say, in each site 7, approximately can print seven, eight ink dots, thus can be when the reflection characteristic that meets reflector plate be revised requirement, improve printing effect.Here, other parameters of selected half tone can not limit.
In the time making described half tone, can be first according to the half tone of the shape of reflector plate 2 and size selection suitable dimension, the concrete distribution situation on reflector plate 2 according to LED light source 1 and site 7, part on half tone except corresponding region, 7 of sites is smeared photoresists, irradiate half tone, make photoresists generation photochemical action, form the mesh that water-fast glued membrane blocks relevant position.Then, half tone is laid on to the top of reflector plate 2, the blending ink that printing is described just can print the roughly the same ink dot of number thus in each site 7.Adopt the mode of making special screen painting ink site, can improve to a great extent printing efficiency.
(4) ink in site is cured.
In the present embodiment, need to be cured for the reflector plate 2 that prints ink site, specifically reflector plate 2 can be put into oven and toast, to allow ink site be solidified.As a kind of preferred design of the present embodiment, the temperature of oven is preferably arranged between 35 ℃ to 45 ℃, and temperature is too low, and the solidification effect of ink site is bad, and reliability is not high; Excess Temperature, easily causes reflector plate 2 buckling deformations.Baking time was preferably arranged on 3 minutes between-8 minutes, was preferably controlled at 5 minutes, to guarantee the solidification effect of ink site.
(5) on being cured the reflector plate 2 of ink site, printing republishes one deck frosted ink, to strengthen dispersion effect.
In the present embodiment, if the surface requirements of site 7 has heavier granular sensation, secondary printing last layer frosted ink on the reflector plate 2 that can be cured in the printing obtaining behind step (1)-(4), to strengthen the dispersion effect of reflector plate 2 in this region.
Described frosted ink is a kind of ultraviolet curing ink, and its base material mostly is gold, silver paperboard or other papers material with strong mirror effect such as compound, the frosted ink that auspicious high-new Applied Materials Inc as triumphant in Zhongshan city produces etc.Its drying mode can adopt baking method, also can adopt UV ultraviolet curing mode, utilizes UV ultraviolet ray to irradiate and solidifies, and irradiation time was preferably set in 10 minutes between-15 minutes.
The present embodiment adopts above-mentioned ink dot printing method to carry out printing treatment to the reflector plate in backlight module, utilize ink site to revise the local reflex characteristic of reflector plate, the light intensity that makes to reflex to by reflector plate diffuser plate is more even, thereby under guaranteeing the prerequisite of liquid crystal panel uniform irradiation, can suitably shorten the light mixing distance of LED light source to diffuser plate, contribute to realize the ultrathin design of LCD product, improve the display effect of direct-light type LED backlight product.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present invention, also should belong to protection scope of the present invention.
Claims (10)
1. a method for printing-ink site on reflector plate, comprises the following steps:
A, according to the gray scale of designing requirement, the ratio of allotment grey, black, three kinds of ink of white, forms blending ink;
B, use half tone on reflector plate, to need the described blending ink of printing in the site of printed ink;
C, the ink being printed in described site is cured.
According to claim 1 on reflector plate the method for printing-ink site, it is characterized in that: in described blending ink, also add and have gloss oil.
According to claim 2 on reflector plate the method for printing-ink site, it is characterized in that: in described blending ink, also add and have delustring ink.
According to claim 3 on reflector plate the method for printing-ink site, it is characterized in that: at allotment gray ink, black ink, white ink, gloss oil, delustring ink, to form in the process of described blending ink, gray ink accounts for 75% of described blending ink; The summation of black ink and white ink accounts for 20% of described blending ink, and wherein, black ink accounts for 5%-15%, and white ink accounts for 15%-5%; The summation of gloss oil and delustring ink accounts for 5% of described blending ink, and wherein, gloss oil accounts for 2%-3%, and delustring ink accounts for 3%-2%.
According to claim 1 on reflector plate the method for printing-ink site, it is characterized in that: in the time making described half tone, the distributing position according to site on reflector plate, blocks the part mesh on half tone, only reserves the corresponding mesh of dot area.
According to claim 1 on reflector plate the method for printing-ink site, it is characterized in that: described reflector plate is the reflector plate in direct-light type LED backlight module, described network point distribution, on the whole reflecting surface of reflector plate, or is only distributed in by LED light source and projects in the spot area that the dispersed light on reflector plate forms.
According to claim 6 on reflector plate the method for printing-ink site, it is characterized in that: described site is uniformly distributed, the color depth that is printed on the blending ink in each site by adjusting carrys out the reflectivity of accommodation reflex sheet zones of different, and the color of following region that light intensity is higher, blending ink is darker, the more weak region of light intensity, the more shallow rule of color of blending ink.
According to claim 6 on reflector plate the method for printing-ink site, it is characterized in that: the blending ink that prints the same color degree of depth in each site, carry out the reflectivity of zones of different on accommodation reflex sheet by regulating the distribution density of site, and it is larger to follow region, dot density that light intensity is higher, the less rule of region, dot density that light intensity is more weak.
According to claim 1 on reflector plate the method for printing-ink site, it is characterized in that: adopt the mode of baking to be cured the ink being printed in described site, baking temperature is arranged between 35 ℃-45 ℃, and baking time was arranged on 3 minutes between-8 minutes.
10. according to the method for printing-ink site on reflector plate described in any one in claim 1 to 9, it is characterized in that: after described step c, also comprise steps d:
D, use half tone republish one deck frosted ink, and described frosted ink are cured in each dot area.
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