TW201209481A - Light guiding plate and light guiding material composition - Google Patents

Abstract

A light guiding plate and a light guiding material composition are provided. The light guiding plate includes a transparent substrate and a light guiding material layer. The thickness of the light guiding material layer is within the range of 5 μ m to 50 μ m. The light guiding material layer is disposed on the transparent substrate. The light guiding material layer includes a light guiding ink. When the thickness of the light guiding ink is 500 μ m, the light transmittance of the light guiding ink is more than 95% for a visible light.

Description

201209481 L>A1UU403 34621twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a light guide plate and a light guide material composition, and particularly relates to a method for reducing chromatic aberration and increasing light output. The light guide plate and the light guiding material composition. [Prior Art]

Generally, the display includes a display panel and a backlight module. With the light and thin development trend of the display device, a thinner side-input light-emitting backlight module has been gradually adopted, which is roughly composed of a light emitting diode (LED) and a light guide plate. Side-lit backlight modules typically include a light source and a light guide. The light guide plate is used to guide the scattering direction of the light generated by the money, and to ensure the uniformity of the brightness of the light exit surface to convert the point light source into a surface light source. The light guide plate is usually composed of a transparent substrate and a light guiding material disposed on the transparent substrate. When the light generated by the light source enters the transparent substrate from the side of the transparent substrate, the field will reflect in the plate, and part of the light will enter the light guiding material. When light enters the light-guiding material, it will be reflected, scattered, and empty. The image will enter the light guide plate again and will pass through the light-emitting surface of the guide wire. For the light-conducting material, the light-conducting material has a relatively high level of visible light, and the amount of light emitted from the light-guide plate is reduced when the light passes through the light-guiding material. In addition, the current use of ', has a higher absorption rate in blue light, thus causing a serious chromatic aberration phenomenon of the light guide plate 201209481 DXI004U3 34621twf.doc/n. [Inventive content] The present invention provides a red-type, which can reduce privacy The invention also provides a light-conducting material composition which can absorb less of the waste material, and the thickness of the light-conducting material layer includes Between 5 μπι and 5〇μηι. Light is guided on a transparent substrate. The light guiding material layer includes a light guiding ink. When the thickness of the light guiding ink is 500 μm, f 2 is greater than 95% of the light transmittance. @^ By the ink, for visible light, it is a derivative of the real blue light, and the upper light guiding ink is, for example, a light curing (ph〇t〇-Cured) material. According to the light guide plate described in the present invention, the light-inducing ink starting agent and the acrylic acid vinegar polymer are polymerized. The present invention is the light guide plate of the embodiment, wherein the content of the monomer is, for example, between 3 G wt% and 70 (10), according to the light guide plate according to the embodiment of the invention, The content of the above photoinitiator is, for example, between ~% and 1 Å. According to the light guide plate of the embodiment of the present invention, the content of the above acrylate polymer is between wt% based on the amount of the light guiding ink. 3, for example, between 20 wt% and 65 201209481 DX100403 3462 ltwf.doc/n The above-mentioned light guiding material layer. The light guiding plate according to the embodiment of the present invention may further include reflective particles. According to the light guide plate of the embodiment of the invention, the material is, for example, cerium oxide or cerium oxide. ▲ The light guide plate according to the embodiment of the invention has a content of the reflective particles of, for example, between 5 and 5% by mass based on the total amount of the light-guiding material.

According to the light guide plate of the embodiment of the invention, the visible light has a wavelength of, for example, between 400 nm and 800 nm. The above transparent substrate is exemplified by a light guide plate according to an embodiment of the invention, such as a transparent plastic substrate. According to the light guide plate of the embodiment of the invention, the material of the transparent substrate is, for example, Ψ _ _ g (pQlymethyl, pm^a) or polyethylene to benzoic acid vinegar (p). The invention further provides a light directing material composition comprising a light directing ink. When the thickness of the light guiding ink is 5 〇〇 μπι, the light guiding ink has a light transmittance of more than 95% for visible light. The light guiding material composition according to the embodiment of the invention, wherein the light guiding ink is, for example, a photocurable material. According to the light guiding material composition of the embodiment of the present invention, the above-mentioned conductive ink is, for example, composed of a (tetra) acid monomer, a photoinitiator, and an acrylic vinegar polymer. According to the light guiding material composition of the embodiment of the present invention, the content of the above-mentioned propyl monomer is, for example, between % pain to 201209481 UA10U4U3 34621 twf.doc/n 70 wt%, based on the total amount of light guiding ink. . According to the light guiding material composition of the embodiment of the present invention, the photoinitiator is contained in an amount of, for example, 1 to % by weight based on the total amount of the light guiding ink. According to the light guiding material composition of the embodiment of the invention, the content of the above acrylate polymer is, for example, between wt% and 65 wt%, based on the total amount of the light guiding ink. The light guiding material composition according to the embodiment of the invention may further comprise reflective particles. The light guiding material composition according to the embodiment of the invention, wherein the material of the reflective particles is, for example, cerium oxide or titanium oxide. According to the light guiding material composition of the embodiment of the invention, the content of the reflective particles is, for example, between 5 wt% and S 15 wt%, based on the total amount of the light guiding material. According to the light guiding material composition of the embodiment of the invention, the wavelength of the visible light is, for example, between 400 nm and 800 nm. Based on the above, in the light guiding material composition of the present invention, since the light guiding ink has a light transmittance of more than 95% for visible light when the thickness of the light guiding ink is 500 μm, the present invention is a light-emitting (four) composition. It has a lower absorption rate for visible light (especially blue light). Further, when the light guiding material composition of the present invention is applied onto a transparent substrate to form a light guide plate for use in a display, the amount of light emitted from the light guiding plate can be effectively increased, and the chromatic aberration can be effectively reduced. In order to make the above features and advantages of the present invention more comprehensible, the following is a specific example of 201209481 DX100403 34621twf.doc/n, and is described in detail with the following formula: [Embodiment] The present invention proposes a light guiding material. Composition. When visible light (wavelength between about 400 nm and 800 nm) enters the light-conducting material composition, and the conventional light guide (4), the composition of the present invention has a lower absorption rate for visible light. Especially for blue light, it has a lower absorption rate. Therefore, when the light-emitting material composition of the present invention is applied onto a transparent substrate to form a light guide plate for use in display, the amount of light emitted from the light guide plate can be effectively increased, and the chromatic aberration can be effectively reduced. In detail, the light guiding material composition of the present invention includes a light guiding ink. When the thickness of the light guiding ink is 500 μm, the light guiding ink has a light transmittance of more than 95% for visible light. It is said that (4) when the ink guiding ink is applied to the light guide plate, the thickness of the coating on the transparent substrate is much less than 5 〇〇 μιη, and the light guiding ink can have a very high light transmittance (greater than the elevation % or More precisely, 'the light guide plate can have a great amount of light. In addition, since the light guiding ink of the present invention has an extremely high light transmittance, that is, it has a relatively low absorption rate for incident visible light (especially 疋 blue light), so that the chromatic aberration phenomenon of the light guide plate can be effectively reduced to further Improve display performance

At rt month t·0 The above-mentioned light guiding ink is, for example, a photocurable material which can be polymerized from an acrylic monomer, a photoinitiator, and an acrylate polymer. In one embodiment, the content of the above acrylic monomer is, for example, between 30 wt/〇 and 70 wt%, based on the total amount of the light guiding ink; and the content of the photoinitiator is, for example, i 201209481 DX100403 34621twf .doc/n wt% to 10 wt%; the content of the acrylic acid polymer is, for example, between 20 wt% and 65 wt%. The acrylic monomer is, for example, tetrahydrofurfuryl acrylate 'THFA, tripropylene glycol diacrylate (TPGDA), hexanediol diacrylate (HDDA), three-menu Trimethylolpropanetriacrylate (TMPTA) and the like. It is possible to use only one type of acrylic monomer or a mixture of a plurality of acrylic monomers. The photoinitiator is, for example, IRGACURETM 184 (1-184) of Ciba Specialty Chemicals, 819, DAROCURtm TPO or TPO-L of Double Bond Chemical Co., Ltd., and the like. It is possible to use only one kind of photoinitiator or a mixture of a plurality of photoinitiators. The above photo-starting agent is for illustrative purposes only, but is not limited thereto. The acrylate polymer is, for example, 353H, 3710 of Double Bond Chemical Co., Ltd., BMA/MMA bead polymer of Evonik Degussa Co., Ltd., and the like. It is possible to use only one acrylate polymer or a mixture of a plurality of acrylate polymers. The above acrylate polymer is for illustrative purposes only, but is not limited thereto. Further, the light guiding material composition of the present invention may further include reflective particles. The reflective particles are uniformly dispersed in the light guiding ink. The reflective particles reflect light entering the composition of the light directing material. The material of the reflective particles is, for example, cerium oxide or titanium oxide. In one embodiment, the total amount of reflective particles of the light-shielding material composition is, for example, between 5 wt% and 15 wt%. The reflective particles are, for example, DegUSSa Acematt® 201209481 ϋλΐυϋ403 34621twf.doc/n product ΟΚ607, ΟΚ412, ΟΚ520, ΟΚ500, ΗΚ125, WR Grace and Company SYLOID® RAD2105 of Evonik Degussa Co., Ltd. 161 and so on. It is possible to use only one kind of reflective particles or to mix a plurality of kinds of reflective particles. The above-mentioned reflective particles are for illustrative purposes only, but are not limited thereto. In particular, when the light-reflecting material composition contains the above-mentioned reflective particles, the reflective particles do not significantly affect the light absorption rate of the light-conducting material composition, and can improve the composition of the light-guiding material. The amount of light reflected and scattered by the object to the transparent substrate. Therefore, the amount of light emitted from the light guide plate can be further increased. 1 is a cross-sectional view of a light guide plate according to an embodiment of the invention. In this embodiment, the light guiding material composition does not contain reflective particles. Referring to FIG. 1, the light guide plate 10 includes a transparent substrate 100 and a light guiding material layer 102. The transparent substrate 100 is, for example, a transparent plastic substrate, which may be polydecyl acrylate or polyethylene terephthalate. The light guiding material layer 102 is a film layer formed of the above-described light guiding material composition, which can be formed on the transparent substrate 丨 (8) by printing or other methods. Generally, it is formed on the coated surface of the transparent substrate 100. (bottom surface 100b). The light guiding material layer 1〇2 may have various patterns such as dots, lines, and the like, depending on actual needs. The thickness of the light guiding material layer 102 is preferably between 5 μm and 50 μm, but is not limited to this thickness. When the light L generated by the light source (not shown) enters the transparent substrate 100 from the side of the transparent substrate 1 , the light L will reflect in the transparent substrate 1 , and part of the light will enter the light guiding material layer 102 . . Since the light guiding material layer 102 has a low absorption rate for the visible light (especially blue light) in the incident light L, the phase light is reflected in the light guiding material layer 1〇2, so that the light ray L is reflected again in the light guiding material layer 1〇2. When scattered into the transparent substrate 1 〇〇 and passed through the light-emitting surface 10a of the transparent substrate 1 ,, the light emitted by the light source and the light generated by the light source do not have a significant decrease in brightness. That is, the light guide plate 10 has a higher amount of light emitted than a conventional light guide plate. In addition, since the light guiding material layer 1 〇 2 has a relatively low absorption rate for visible light (especially blue light), the chromatic aberration of the light guiding plate can also be solved to improve the display performance of the display. 2 is a cross-sectional view of a light guide plate according to another embodiment of the invention. Referring to FIG. 2, the light guide plate 20 includes a transparent substrate 100 and a light guiding material layer 202. The difference between the light guide plate 20 and the light guide plate 1 is that in the light guide plate 20, the light guide material layer 2〇2 contains the reflective particles 2〇〇. When the light L entering the light guiding material layer 202 encounters the reflective particles 200, the light ray 1 can be reflected by the reflective particles 200 to enter the transparent substrate 1 再次 again. In other words, the reflective particles 200 reduce the amount of light L that directly passes through the light guiding material layer 2〇2 without entering the transparent substrate 100, and increases the amount of light reflected and scattered to the transparent substrate 100', so that it can be further improved The amount of light emitted from the light guide plate 20. Further, when the light guiding material layer 202 contains the reflective particles 200, the light guiding material layer 202 may also be applied as a film covering the bottom surface 100b of the transparent substrate 1'', as shown in FIG. Hereinafter, the light guiding material composition of the present invention and a light guide plate will be described by way of experimental examples. Experimental Example 1 The light guiding material composition included a light guiding ink and contained no reflective particles. 201209481 UX1UU403 34621twf.doc/n The light guiding ink has the following composition: Acrylic monomer: THFA (accounting for 19.2 wt% based on the total amount of light guiding ink), HDDA (based on the total amount of light guiding ink, accounting for 24wt ° / 〇) Photoinitiator: 1-184 (accounting for 1.8 wt 〇 / based on the total amount of light guiding ink) Acrylate polymer: 353H (55 wt% based on the total amount of light guiding ink) The light guiding ink was subjected to a light transmittance test, and the results are shown in Table 1. Table 1 Thickness of light guiding ink (μχη) Transmittance of light with wavelength of 400 nm (%) Transmittance of light with wavelength of 700 nm (%) 250 97.651 98.802 730 93.892 ------- 96.887 The obtained result can be obtained according to the theoretical calculation, when the thickness of the light guiding ink is 50 〇 4 „!, the transmittance for light having a wavelength of 4 〇〇 nm is ^. 4%, and for the wavelength of 7 〇〇 nm. The light transmittance is 97%. It is also said that the light-conducting material composition in the experimental example is applied to a transparent substrate to form a light guide plate, and the thickness of the light-conducting material composition (the thickness thereof is much less than 5 〇). Ομπι) can have a relatively high light penetration, and the guide has a relatively high enthalpy. I. Experimental Example 2 Light-guiding material composition includes: 201209481 DX100403 34621twf.doc/n (1) Light-guiding ink, with the following Ingredients: Acrylic monomer: THFA (17.1wt% based on the total amount of light guiding ink), HDDA (21.5 wt0/〇 based on the total amount of light guiding ink) Photoinitiator: 1-184 ( The total amount of light guiding ink, accounting for 3.4 wt%) Acrylate polymer: 353H (accounting for 58 wt% based on the total amount of light guiding ink) (2) Reflecting particles: OK412 (13 wt% based on the total amount of the light-conducting material composition) The above-mentioned light-conducting material composition was subjected to a relative light transmittance test at a thickness of 10 μm to a transmittance at an incident light wavelength of 800 nm. As a benchmark (100%), the results are shown in Table 2. Table 2: Transmittance of light with a wavelength of 400 nm (%) Transmittance of light with a wavelength of 800 nm (%) 83.67 100 As shown in Table 2, when the present invention When the light guiding material composition further contains reflective particles, the transmittance is lowered due to the enhanced reflectance of the reflective particles, but the high transmittance light guiding ink and high reflectance reflection included in the light guiding material composition are included. The particles have a relatively low absorption rate for visible light (especially blue light), so the chromatic aberration phenomenon can still be effectively reduced. The color difference test of the light guiding material composition in Experimental Example 1 will be carried out below. 12 201209481 UA1UU403 34621tw£doc/ n Color difference test: The light guide material composition in Experimental Example 1 was coated on a 15.6-pair transparent substrate to form a light guide plate having a light guide material layer thickness of about 30 μm. The light guide plate was equally divided by 13 points, and Measuring each point As shown in Fig. 4, the light guide plate 4 is equally divided by 13 points 402. The maximum value and the minimum value of the chromaticity (8) of 13 points are subtracted, that is, the color difference. Similarly, the chromaticity of 13 points is used. The difference between the maximum value and the minimum value of (y) is y color difference.

As can be seen from Table 3, the chromaticity difference in the chromaticity (y) of the light-guiding material composition in Experimental Example 1 was relatively low and conformed to the specification (less than 〇 〇 1). Hereinafter, the light guiding material composition of Experimental Example 2 and the light guiding material composition of Comparative Example 1 (SPE 'Yong Yun Ink Co., Ltd. (Nagase Screen Printing 13 201209481 DX100403 34621 tw.

A-1DTH SPE MAT medium of Research Co.) and the light-guiding material composition (F59) of Comparative Example 2 were coated on a transparent substrate to form a light guide plate, and the light transmittance test and color difference test were performed on these light guide plates. The light guiding material composition (F59) of Comparative Example 2 includes: (1) a light guiding ink having the following components: acrylic monomer: THFA (15.5 wt% based on the total amount of the light guiding material composition), HDDA ( Based on the total amount of the light-guiding material composition, accounting for 23.5 wt%) Photoinitiator: 1-184 (accounting for 3 wt% based on the total amount of light-conducting material composition) Acrylate and benzophenone ( Styrene) Eterac Chemicals (Eternal Chemical Co.) Eterac B-713H (45 wt% based on the total amount of light-conducting material) This light-guiding ink is 30 μm thick for wavelength The transmittance of light at 400 nm is 95.024%. (2) Reflective particles: OK412 (13 wt% based on the total amount of light-conducting material composition) The above three light-conducting material compositions were tested for relative light transmittance at a thickness of 10 μm to the incident light wavelength. The transmittance is the benchmark (100%) at 800 nm, and the results are shown in Table 4. Table 4 __ _ Wavelength of light with a wavelength of 400 nm Penetration of light with a wavelength of 800 nm 201209481 υλΐυυ4〇3 34621twf.doc/n (%) Experimental Example 2 83.67, 7 100 Comparative Example 1 (SPE) 38.69 100 Comparative Example 2 (F59) 74.14 100

As can be seen from Table 4, by using the high transmittance light guiding ink of the present invention, the transmittance of visible light (especially 疋 blue light) can be effectively & and the chromatic aberration can be effectively reduced. Color difference test: The light guide material compositions in Experimental Example 2, Comparative Example 1 (SPE) and Comparative Example 2 (F59) were respectively applied onto a transparent substrate to form a light guide plate having a light guiding material layer thickness of about 30 μm. The direction in which the light guide plate parallel to the direction in which the light is emitted by the light source is defined is the Υ direction, and the direction perpendicular to the γ direction is defined as the X direction. The measuring machine is SR3 (Topcon Technohouse Corp.); the optical path distance is about 520 mm; the chromaticity difference is measured in the Y direction (maximum minus the minimum value). The test results are shown in Table 5. Table 5 points 1 point 2 points 3 points 4 points 5 points 6 points 7 points 8 points 8 points 9 maximum - minimum experimental example 2 0.298 0.296 0.294 0.293 0.291 0.291 0.290 0.288 0.288 0.010 SPE 0.358 0.355 0.352 0.347 0.343 0.340 0.339 0.338 0.336 0.023 F59 0.296 0.294 0.292 0.289 0.286 0.285 0.283 0.282 0.281 0.015 15 201209481 DX100403 3462Itwf.d〇c/n It can be seen from Tables 4 and 5 that the light guiding material composition of the present invention is compared with the general light guiding material composition (SPE, F59). (Experimental Example 2) has a higher light transmittance' means that it can have a lower absorption for visible light (especially blue light), and thus has a light guide plate of the light guiding material composition of the present invention (Experimental Example 2) It can have a smaller amount of chrominance difference. In other words, the light guiding material composition of the present invention can reduce the chromatic aberration of the light guide plate, and thus improve the display performance of the display.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any of the technologies of the present invention have a wealth of knowledge, and when: a little more dynamic, the accompanying Wei Weiwei The scope defined in the patent scope shall prevail. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a light guide plate according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a ''

BRIEF DESCRIPTION OF THE DRAWINGS A cross-section f 4 of a light guide plate according to another embodiment of the present invention is a schematic view of a light guide plate according to the present invention. Point bisector 16 201209481 UA1UU403 34621twf.doc/n [Description of main component symbols] 10, 20: Light guide plate 100: Transparent substrate 100a: Light-emitting surface 100b: Bottom surface 102, 202: Light-guiding material layer 200: Reflected particles L: Light

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Claims (1)

201209481 DX100403 34621twf.doc/n VII. Patent application scope: 1. A light guide plate comprising: a transparent substrate; and a light guiding material layer having a thickness of between 5 μm and 5 ,, disposed on the transparent substrate, The light guiding material layer comprises a light guiding ink. When the thickness of the light guiding ink is 500 μπχ, the light guiding ink has a light transmittance of more than 95%. The light guide plate of claim 2, wherein the light guiding ink is a photocurable material. 3. The light guide plate of claim 2, wherein the light guiding ink is polymerized from the following materials: an acrylic monomer; a photoinitiator; and an acrylate polymer. 4. The light guide plate of claim 3, wherein the content of the acrylic monomer is between 3% and 7% by weight based on the total amount of the light guiding ink. 5. The light guide plate of claim 3, wherein the photoinitiator is present in an amount between 1 wt% and 1 〇 wt% based on the total amount of the light guiding ink. 6. The light guide plate of claim 3, wherein the acrylate polymer is present in an amount of from 20 wt%/0 to 65 wt% based on the total amount of the light guiding ink. 7. The light guide plate of claim 1, wherein the light guide 201209481 υΛΐυι^03 34621twf.doc/n material layer further comprises a reflective particle. 8. The light guide plate of claim 7, wherein the material of the particles comprises ceria or titania. / , 9. The light guide plate according to claim 7 of the patent application, wherein the wt% of the optical material layer between the wt%, the content of the anti-hyposome is between 5 and 15. The light guide plate, The wavelength of the light is between ^(^瓜至8〇〇nm. °Λ 11. The light guide plate according to the scope of the patent application, the bright substrate comprises a transparent plastic substrate. >, 1 through 12 The light guide plate according to the scope of the patent application of the invention, wherein the material of the substrate comprises polyacrylic acid (10), and the composition of the light guide material is Including a light guiding ink, the light guiding ink has a light transmittance of more than 95% when the thickness of the preparation ink is 50 〇μπι. H 14. The light guide according to claim 13 The light guiding ink is a light-curing material. The light guiding material composition according to claim 14, wherein the light guiding ink is polymerized from the following materials: an acrylic monomer; A photoinitiator; and an acrylate polymer. 16. The light-guiding material composition of claim 15 of claim 15 201209481 DX100403 34621 twf.doc/n, wherein the total amount of the light guiding ink is The acrylic monomer is contained between 30 wt% and 70 wt%. The light guiding material composition of item 15, wherein the photoinitiator comprises between #1 wt% and 10 wt% of the total amount of the light guiding ink. 18. The light guiding material composition according to Item 15, wherein the content of the acrylate polymer is between 20 wt% and 65 wt% based on the total amount of the light guiding ink. The light guiding material composition of the present invention, further comprising a reflective particle. The light guiding material composition according to claim 19, wherein the material of the reflective particle comprises cerium oxide or titanium oxide. The light guiding material composition of claim 19, wherein the content of the reflective particles is between 5 wt% and 15 wt%, based on the total amount of the light guiding material composition. The light guiding material composition described in claim 13 wherein the visible light has a wavelength between 400 nm and 800 nm.