CN101276007A - Diffusing plate and method for coating reflection layer on diffusing plate - Google Patents
Diffusing plate and method for coating reflection layer on diffusing plate Download PDFInfo
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- CN101276007A CN101276007A CNA2007100869905A CN200710086990A CN101276007A CN 101276007 A CN101276007 A CN 101276007A CN A2007100869905 A CNA2007100869905 A CN A2007100869905A CN 200710086990 A CN200710086990 A CN 200710086990A CN 101276007 A CN101276007 A CN 101276007A
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Abstract
The present invention provides a diffusion plate and a method for coating a reflection layer on the diffusion plate. The diffusion plate is provided with a light-outing surface and a light-entering surface. The light-outing surface is provided with a plurality of microstructure bodies, wherein the top of these microstructure bodies or the bottom dent between the top and each microstructure body is coated with a reflection layer. The method for coating the reflection layer on the diffusion board comprises the following procedures: (a) preparing a slurry containing a reflection material; (b) coating the slurry on the top of the microstructure body or simultaneously coating the slurry on the bottom dent between the top and each microstructure body; (c) drying the slurry coated on the top; and (d) hardening the dried slurry to form a reflection layer.
Description
Technical field
The invention relates to the diffuser plate that a kind of optics is used, particularly a kind of diffuser plate that has a plurality of microstructure bodies, is coated with the reflection horizon.
Background technology
In recent years, traditional cathode-ray tube display (CRT monitor that promptly is commonly called as) is replaced by LCD gradually, main cause is that the radiant quantity that LCD discharges is far smaller than CRT monitor, and LCD also reduces significantly in this manufacturing cost in several years.In general, LCD comprises backlight module and liquid crystal panel two large divisions, and the main function of backlight module is to provide the light source liquid crystal display to use.
Please refer to Fig. 1, it is an existing backlight module that Fig. 1 illustrates.This backlight module 100 mainly is made of with a plurality of blooming 140 cathode fluorescent tube (CCFL) 110, reflex housing 120, diffuser plate 130, cathode fluorescent tube 110 is in order to producing light source, and reflex housing 120 then is to the direction towards diffuser plate 130 in order to ray guidance that cathode fluorescent tube 110 is produced.The function of diffuser plate 130 mainly is that the light that cathode fluorescent tube 110 is sent is spread, can be more even so that expose to the light of liquid crystal panel (not illustrating), and more can on the display surface of LCD, not produce the phenomenon of brightness irregularities.
At present, the exiting surface 132 of diffuser plate 130 on the market all is a smooth surface, yet in order to make diffuser plate 130 that better light diffusion effect be arranged, some manufacturer can be provided with a plurality of microstructure bodies on the exiting surface of diffuser plate.Please refer to Fig. 2, Fig. 2 illustrate is existing a kind of diffuser plate with microstructure body.The exiting surface 232 of this diffuser plate 230 has a plurality of microstructure bodies 234, and these microstructure bodies 234 for example are that the mode roll extrusion on diffuser plate 230 with roll extrusion forms.
Then, please refer to Fig. 3 A and Fig. 3 B, Fig. 3 A illustrate is the light path synoptic diagram in the diffuser plate of Fig. 1 into the light path synoptic diagram in the diffuser plate of Fig. 2, Fig. 3 B illustrate.Please earlier with reference to Fig. 3 A, light I1 and light I2 are sent by same cathode fluorescent tube 110, when light I1 and light I2 with respect to the incident angle θ 1 of exiting surface 232 with incident angle θ 2 during more than or equal to critical angle (critical angle), light I1 and light I2 just can produce total reflection (total reflection), and make light I1 and light I2 depart from the direction of originally advancing more significantly.Then, please refer to Fig. 3 B, because the exiting surface 132 of diffuser plate 130 is not provided with the microstructure body, I1 ' and I2 ' only produce refraction, so compared to light I1 and light I2, light I1 ' and light I2 ' produce less deviation in driction.
Because diffuser plate 230 has the setting of microstructure body 234,, allow light be mixed with each other and produce brightness uniformly so diffuser plate 230 can make the light that is traveling in wherein produce bigger departing from.So, when the observer when the top is overlooked, diffuser plate 230 has Luminance Distribution uniformly compared to diffuser plate 130.
Yet the top 234a of microstructure body 234 often can't form a tip-angled shape, can present certain radian usually.Therefore, when light I3 penetrates to top 234a, often can't produce total reflection because incident angle θ 3 is too small, in other words, light I3 easily appears from the top 234a of microstructure body 234, make that light I3 can't continue fully to mix with other light, and then make the effect of light diffusion of diffuser plate 230 descend.
Therefore, brightness how to avoid the top of microstructure body to influence diffuser plate evenly distributes, and is worth those skilled in the art to go to consider.
Summary of the invention
Described diffuser plate the purpose of this invention is to provide a kind of diffuser plate that is coated with the reflection material, so that can present Luminance Distribution uniformly.
Another object of the present invention provides the method for a kind of coating reflection layer at diffuser plate, so that the reflection horizon can be coated on the top of the microstructure body of diffuser plate effectively.
According to above-mentioned purpose and other purpose, the invention provides a kind of diffuser plate, this diffuser plate has an exiting surface and an incidence surface, and this exiting surface is provided with a plurality of microstructure bodies, and wherein the top coating of these microstructure bodies has the reflection horizon.
In above-mentioned diffuser plate, the top of microstructure body is a cambered surface or a plane.
In above-mentioned diffuser plate, the reflectivity in reflection horizon is between 80%～95%.
In above-mentioned diffuser plate, the material in reflection horizon is selected from least a material in alundum (Al, silicon dioxide and the titania.
In above-mentioned diffuser plate, also can be provided with a plurality of second microstructure bodies on its incidence surface.
In above-mentioned diffuser plate, can also be that the bottom recess between each microstructure top and each the microstructure body is coated with the reflection horizon simultaneously.
The invention provides the method for a kind of coating reflection layer at diffuser plate, this diffuser plate has a plurality of microstructure bodies, and above-mentioned coating reflection layer comprises in the method for diffuser plate: (a) make and contain the slurry that reflects material; (b) slurry is coated on the top of microstructure body; (c) slurry that will be coated on the top carries out drying; (d) dried slurry is hardened, to form the reflection horizon.
In the method for above-mentioned coating reflection layer at diffuser plate, wherein (b) step is: at first, slurry is coated on the web plate; Then, diffuser plate is placed on the below of web plate; Afterwards, the slurry on the tool using spreading web plate, and make slurry drop down onto the top of microstructure body by the mesh on the web plate.
In the method for above-mentioned coating reflection layer at diffuser plate, (b) step also can be other kenel, and one of them is: slurry is coated on the roller, the top of microstructure body is crossed in the roller roll extrusion, so that slurry is coated on the top of microstructure body.Perhaps, (b) step also can be: slurry is coated on the substrate; Diffuser plate is pressed on the substrate,, and allows slurry be coated on the top so that the top of microstructure body contacts with slurry.
If when this slurry is coated on microstructure body top, also be coated on the bottom recess between each microstructure body, then can utilize the roller rolling process, in this case, can apply stronger power on roller, so, the slurry of part just can flow into the bottom recess.
In the method for above-mentioned coating reflection layer at diffuser plate, (c) step is: it is under 60 ℃～80 ℃ the environment that diffuser plate is placed on temperature, carries out drying.
In the method for above-mentioned coating reflection layer at diffuser plate, (d) step is: use the mode of ultraviolet ray or thermal treatment (Thermal Curing) to allow dried slurry harden.
In the method for above-mentioned coating reflection layer at diffuser plate, described slurry is the potpourri of colloid, reflection material and cyclohexanone solvent.Described reflection material is titania or silicon dioxide, and colloid then is the polyacrylic colloid.In the described slurry, the shared weight ratio of reflection material is 6%～15%, and the shared weight ratio of colloid is about 40%, and remaining then is a cyclohexanone solvent.Making contains the method for the slurry that reflects material, will reflect material, polypropylene colloid and cyclohexanone exactly and mix and get final product.
Compared with prior art, the beneficial effect that the present invention has is: because the exiting surface of diffuser plate of the present invention is provided with a plurality of microstructure bodies, and the top coating of these microstructure bodies has the reflection horizon.So, can make the light reflection that exposes to the top, make that light can continue to mix with other light fully, and then allow the brightness of diffuser plate integral body can be more evenly.In addition, utilize the method for coating reflection layer of the present invention, also the reflection horizon can be coated on effectively the top of microstructure body at diffuser plate.
For above-mentioned purpose of the present invention, feature and advantage more can be become apparent, hereinafter will and cooperate appended diagram with embodiment, be described in detail below.In addition, be noted that appended diagram only is signal, but not draw according to certain engineer's scale.
Description of drawings
Fig. 1 is existing backlight module;
Fig. 2 is existing a kind of diffuser plate with microstructure body;
Fig. 3 A is the light path synoptic diagram in the diffuser plate of Fig. 2, and Fig. 3 B is the light path synoptic diagram in the diffuser plate of Fig. 1;
Fig. 4 is the backlight module of present embodiment;
Fig. 5 is the diffuser plate of present embodiment;
Fig. 6 is the enlarged drawing of the first microstructure body of Fig. 5;
Fig. 7 A is the enlarged drawing of the first microstructure body of another kenel;
Fig. 7 B is another kenel that the reflection horizon distributes;
Fig. 8 is the diffuser plate of another embodiment;
Fig. 9 A～Fig. 9 D is the method flow of coating reflection layer at microstructure body top;
Figure 10 A～Figure 10 B is for being coated on slurry another implementation method flow process at the top of the first microstructure body;
Figure 11 A～Figure 11 B is for being coated on slurry an implementation method flow process again at the top of the first microstructure body.
Description of reference numerals: 100-backlight module; The 110-cathode fluorescent tube; The 120-reflex housing; The 130-diffuser plate; The 140-blooming; The 230-diffuser plate; The 232-exiting surface; 234-microstructure body; The 234a-top; I1～I4, I1 '～I2 '-light; θ 1～θ 4-incident angle; The 10-web plate; The 12-mesh; 20-first roller; 20 '-the second roller; The 30-substrate; The 300-backlight module; The 310-light emitting source; The 320-reflex housing; 330,330 ', 430-diffuser plate; 332,432-exiting surface; 334,334 ', the 434-first microstructure body; 334a, 334a ', 434a, 438a-top; 334b '-bottom recess; The 336-reflection horizon; 336 '-slurry; The 340-blooming; The 433-incidence surface; The 438-second microstructure body; The E-environment; The T-temperature; The UV-ultraviolet ray.
Embodiment
See also Fig. 4, Figure 4 shows that a backlight module of present embodiment.This backlight module 300 comprises light emitting source 310, reflex housing 320, diffuser plate 330 and a plurality of bloomings 340, wherein light emitting source 310 is cathode fluorescent tube in the present embodiment, and those of ordinary skills also can use light emitting diode (LED) to replace cathode fluorescent tube certainly.Reflex housing 320 has reflective function, diffuser plate 330 then is made by the macromolecule light-transmitting materials, described macromolecule light-transmitting materials for example is polymethylmethacrylate (Poly methylmethacrylate abbreviates PMMA as) or polystyrene (Poly Styrene abbreviates PS as).In addition, the inside of diffuser plate 330 for example also can be doped with light diffusion particle or ultraviolet light absorber etc.Blooming 340 for example is brightness enhancement film (Brightness Enhancement Film) or diffusion barrier (Diffusion Film), and the function of brightness enhancement film is to make the brightness of view directions to increase, and diffusion barrier then is the diffusion effect that is used for increasing further light.
Fig. 5 is the diffuser plate of present embodiment, and Fig. 6 is the enlarged drawing of the first microstructure body of Fig. 5.Please be simultaneously with reference to Fig. 5 and Fig. 6, the exiting surface 332 of diffuser plate 330 has a plurality of first microstructure bodies 334, and wherein the top 334a at these first microstructure bodies 334 is coated with reflection horizon 336.The reflectivity in this reflection horizon 336 is between 80%～95%, and the material in reflection horizon 336 is preferably alundum (Al (Al
2O
3), titania (TiO
2) or silicon dioxide (SiO
2).
Then, please continue with reference to Fig. 6.Because the top 334a of the first microstructure body 334 is coated with reflection horizon 336, even so penetrate incident angle θ 4 to the light I4 of top 334a less than critical angle, still can make light I4 reflection because of the cause in reflection horizon 336, and then make light I4 change direct of travel originally.Can reflect owing to expose to the light I4 of top 334a, so light I4 can continue and other light mixes fully.Compared to existing diffuser plate 230, the Luminance Distribution that diffuser plate 330 is presented can be more even.
In the above-described embodiment, the top 334a of the first microstructure body 334 is a cambered surface of protruding, yet the top 334a of the first microstructure body 334 also can make other shape in fact, for example is the concave surface or a plane of a depression.Please refer to Fig. 7 A, Fig. 7 A illustrate is the enlarged drawing of the first microstructure body of another kenel.Shown in Fig. 7 A, the top 334a ' of the first microstructure body 334 ' can form a plane.Because top 334a ' is a plane, so reflection horizon 336 more easily is coated on the 334a ' of top and than difficult drop-off.
Certainly, reflection horizon 336 is not limited to be coated on the top 334a ' of the first microstructure body 334 ', also can be coated on other place of the first microstructure body 334 ' according to situation.Shown in Fig. 7 B, reflection horizon 336 also can be coated on the first microstructure body 334 ' bottom recess 334b ' each other except being coated on top 334a '.
If overlook from the top of diffuser plate 330 or diffuser plate 330 ', the above-mentioned first microstructure body 334 and the first microstructure body 334 ' all are an elongate in shape, but the first microstructure body still can be made into other shape, as a cone, and in the top coating of this cone reflection horizon 336 is arranged.
In addition, above-mentioned diffuser plate 330 or diffuser plate 330 ' only are provided with the first microstructure body 334 and the first microstructure body 334 ' at its exiting surface, but those of ordinary skills also can be provided with the microstructure body to promote the light diffusion effect of diffuser plate at incidence surface.Please refer to Fig. 8, Fig. 8 illustrate is the diffuser plate of another embodiment.In diffuser plate 430, except exiting surface 432 disposes a plurality of first microstructure bodies 434, also dispose a plurality of second microstructure bodies 438 at incidence surface 433 places, so can further increase the light diffusion effect of diffuser plate 430.Yet, because the consideration in the brightness, the top 438a of the second microstructure body 438 is coating reflection layer 336 not usually, certainly those of ordinary skills also can be according to circumstances on the top 438a of the top 434a of the first microstructure body 434 and the second microstructure body 438 coating reflection layer 336.
See also Fig. 9 A～Fig. 9 D, Fig. 9 A～Fig. 9 D illustrate is the flow process of coating reflection layer at the top of microstructure body.At first, see also Fig. 9 A, make a slurry 336 ', this slurry 336 ' is the potpourri of colloid, reflection material and cyclohexanone solvent, this reflection material for example is titania (TiO2) or silicon dioxide (SiO2), and colloid then is a polyacrylic colloid (Acrylics).In slurry 336 ', the shared weight ratio of reflection material is 6%～15%, and the shared weight ratio of colloid is about 40%, and remaining then is a cyclohexanone solvent.Slurry 336 ' is uniformly coated on the web plate 10, and this web plate 10 has a plurality of mesh 12.Then, see also Fig. 9 B, diffuser plate 330 ' is placed on the below of web plate 10, and utilizes one first roller 20 to press down slurry 336 ' on the web plate 10, and make slurry 336 ' drop down onto the top 334a ' of the first microstructure body 334 ' by the mesh on the web plate 10 12.Certainly, those of ordinary skills also can other instrument (for example: scraper) replace first roller 20.
Come, please refer to Fig. 9 C, diffuser plate 330 ' is placed under the environment E of a high temperature and carries out drying, the environment E of this high temperature for example is the inside of a drying box (not illustrating), and the temperature T of this environment E for example is 60 ℃～80 ℃.If temperature T is higher, the then dry required time is just shorter.
Afterwards, please use ultraviolet (UV) irradiation diffuser plate 330 ' simultaneously with reference to Fig. 9 D and Fig. 7 B so that slurry 336 ' sclerosis, treat that step that slurry 336 ' hardens is finished after, reflection horizon 336 just firmly is formed on the top 334a ' of the first microstructure body 334 '.Certainly, those of ordinary skills also can use heat treated mode to make 336 ' sclerosis.
Except using web plate 10, can also use other mode, to allow slurry 336 ' be coated on the top 334a ' of the first microstructure body 334 '.Please consult Figure 10 A and Figure 10 B simultaneously, Figure 10 A～Figure 10 B illustrate is another implementing procedure at the top that slurry is coated on the first microstructure body.At first, slurry 336 ' is uniformly coated on one second roller 20 ' and goes up (as Figure 10 A).Then, the top 334a ' of the first microstructure body 334 ' is crossed in the 20 ' roll extrusion of second roller,, go up (as Figure 10 B) so can be attached on the top 334a ' of the first microstructure body 334 ' because slurry 336 ' tool is a bit sticky.Afterwards, carry out the drying and the sclerosis of slurry 336 ' again, because the drying of slurry 336 ' is introduced with sclerosis, so just repeat no more at this in the related description of Fig. 9 C and Fig. 9 D.
In addition, also but application drawing 10A and the described method of Figure 10 B are coated on the first microstructure body 334 ' bottom recess 334b ' each other with slurry 336 ', method such as following: apply stronger power on second roller 20 ', then Bu Fen slurry 336 ' just can flow into bottom recess 334b ', and forms the distribution in the reflection horizon 336 shown in Fig. 7 B.
See also Figure 11 A～Figure 11 B, Figure 11 A～Figure 11 B illustrate is an implementing procedure again at the top that slurry is coated on the first microstructure body.At first, slurry 336 ' is uniformly coated on (as Figure 11 A) on the substrate 30.Then, with diffuser plate 330 ' by being pressed on the substrate 30, so that the top 334a ' of the first microstructure body 334 ' contacts with slurry 336 ' (as Figure 11 B).Because slurry 336 ' tool is a bit sticky, so can be attached on the 334a ' of top.Afterwards, carry out the drying and the sclerosis of slurry 336 ' again, flow process afterwards is promptly described in the related description of Fig. 9 C and Fig. 9 D, so just repeat no more at this.
The present invention illustrates as above that with embodiment so it is not in order to limit the patent right scope that the present invention advocated.Its scope of patent protection when on accompanying claim and etc. same domain decide.All those of ordinary skills, in not breaking away from this patent spirit or scope, change of being done or retouching all belong to the equivalence of being finished under the disclosed spirit and change or design, and should be included in the following claim.
Claims (13)
1. a diffuser plate has an exiting surface and an incidence surface, and described exiting surface is provided with a plurality of microstructure bodies, it is characterized in that: the top coating of described microstructure body has the reflection horizon.
2. diffuser plate according to claim 1 is characterized in that: the top of described microstructure body is a cambered surface.
3. diffuser plate according to claim 1 is characterized in that: the top of described microstructure body is a plane.
4. diffuser plate according to claim 1 is characterized in that: the reflectivity in described reflection horizon is between 80%～95%.
5. diffuser plate according to claim 1 is characterized in that: the material in described reflection horizon is selected from alundum (Al, titania and silicon dioxide at least a material wherein.
6. diffuser plate according to claim 1 is characterized in that: also be coated with the reflection horizon at described microstructure body bottom recess each other simultaneously.
7. diffuser plate according to claim 1 is characterized in that: also described incidence surface is provided with a plurality of second microstructure bodies.
8. the method for a coating reflection layer on diffuser plate, described diffuser plate has a plurality of microstructure bodies, it is characterized in that, and described coating reflection layer comprises in the method for diffuser plate:
(a) making contains the slurry that reflects material;
(b) described slurry is coated on the top of described microstructure body;
(c) slurry that will be coated on described top carries out drying; And
(d) dried slurry is hardened, to form a reflection horizon.
9. coating reflection layer according to claim 8 is in the method for diffuser plate, and it is characterized in that: (b) step comprises:
Slurry is coated on the web plate;
Described diffuser plate is placed on the below of described web plate; And
Tool using presses down the slurry on the described web plate, and makes described slurry drop down onto the top of described microstructure body by the mesh on the described web plate.
10. coating reflection layer according to claim 8 is in the method for diffuser plate, and it is characterized in that: (b) step comprises:
Slurry is coated on the roller; The top of described microstructure body is crossed in described roller roll extrusion, so that described slurry is coated on the top of described microstructure body.
11. coating reflection layer according to claim 8 is characterized in that in the method for diffuser plate: (b) step comprises slurry is coated on the substrate; Diffuser plate is pressed on the described substrate,, and allows described slurry be coated on the described top so that the top of described microstructure body contacts with slurry.
12. coating reflection layer according to claim 8 is characterized in that in the method for diffuser plate: (c) step comprises:
It is under 60 ℃～80 ℃ the environment that described diffuser plate is placed on temperature, carries out drying.
13. coating reflection layer according to claim 8 is characterized in that in the method for diffuser plate: (d) step comprises:
Use ultraviolet ray with dried slurry sclerosis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100869905A CN101276007B (en) | 2007-03-29 | 2007-03-29 | Diffusing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100869905A CN101276007B (en) | 2007-03-29 | 2007-03-29 | Diffusing plate |
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| Publication Number | Publication Date |
|---|---|
| CN101276007A true CN101276007A (en) | 2008-10-01 |
| CN101276007B CN101276007B (en) | 2012-03-14 |
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|---|---|---|---|
| CN2007100869905A Active CN101276007B (en) | 2007-03-29 | 2007-03-29 | Diffusing plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466830A (en) * | 2010-11-16 | 2012-05-23 | 奇美实业股份有限公司 | Light diffusion plate with microstructure and light guide plate |
-
2007
- 2007-03-29 CN CN2007100869905A patent/CN101276007B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466830A (en) * | 2010-11-16 | 2012-05-23 | 奇美实业股份有限公司 | Light diffusion plate with microstructure and light guide plate |
| CN102466830B (en) * | 2010-11-16 | 2013-03-27 | 奇美实业股份有限公司 | Light diffusion plate with microstructure and light guide plate |
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| Publication number | Publication date |
|---|---|
| CN101276007B (en) | 2012-03-14 |
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