CN103364865A - Light guide plate production method - Google Patents

Abstract

The invention provides a light guide plate production method which comprises the following steps: 1) UV (ultra violet) hardened resin is coated on a light guide plate body; 2) the UV hardened resin is imprinted by a die; 3) demoulding is carried out to form a pattern complementary with a shape of the die in the hardened resin; 4) the UV hardened resin is exposed in ultraviolet light so as to harden the UV hardened resin.

Description

A kind of manufacture method of light guide plate

Technical field

The present invention relates to the manufacture method of a kind of light guide plate (light guide panel, LGP), the method that relates in particular to a kind of utilization impression (imprint) is made the method for light guide plate.

Background technology

In liquid crystal display, because liquid crystal panel does not have luminous function, therefore below liquid crystal panel, place back light unit (back light unit, BLU), thereby reach the function of demonstration with the source that light is provided.In back light unit, usually adopt cathode fluorescent tube (cold cathode fluorescent lamp, CCFL), LED (light emitting diode) etc. is as light source, environmental protection characteristic becomes main stream light sources gradually and LED is because its lower power consumption reaches preferably, and led light source can also be so that liquid crystal display be more frivolous.Existing back light unit also comprises light guide plate and a plurality of blooming piece usually; such as diffusion sheet, prismatic lens, brightening piece, reflector plate etc.; by covering multi-layer optical membrane in light guide plate; can so that the light that light source sends after passing light guide plate and blooming piece; be more evenly distributed, thereby the light that light source provides is converted to the required area source of liquid crystal panel.

The structure of existing light guide plate as shown in Figure 1.The light guide plate bottom has scattering layer, after being scattered layer scattering, the light that incides light guide plate from the light guide plate side penetrates uniformly light guide plate, thereby make the light source of light guide plate side convert area source to, pass through again the further diffusion layer, layers of prisms, lustre adding layer of light guide plate top etc., can make the light of ejaculation more even.The manufacture method of scattering layer mainly contains printing and two kinds of Laser Processings at present, print process as shown in Figure 1a, that the scattering materials such as fluorescent powder are printed on the light guide plate bottom, the printed patterns that consists of by fluorescent powder consists of scattering pattern, the advantage of this method is and can produces in a large number, shortcoming is that the brightness of light guide plate emergent light is low, laser processing is shown in Fig. 1 b, be to form a plurality of depressions in the light guide plate bottom, this is recessed to form scattering pattern, and the advantage of this method is that the brightness of light guide plate emergent light is high, shortcoming is that Laser Processing can not produce in a large number, and process velocity is slow, apparatus expensive, and processing cost is high.In the past few years, developed a kind of method of making light guide plate with impression (imprint) legal system, concrete steps as shown in Figure 2, in the method, the UV hardening resin is coated on the light conducting plate body, with this UV hardening resin of die marks, (UV) exposes to the UV hardening resin with ultraviolet light, thereby makes this hardening of resin again, form scattering pattern, then the demoulding, this manufacture method can be in conjunction with the advantage of printing and Laser Processing, and the brightness of light guide plate emergent light is high, can produce in a large number, and process velocity is fast, and processing cost is low, but owing to before the demoulding, carry out the UV exposure, therefore the technique of UV exposure is received the restriction of mould and underaction, angle such as the UV exposure is not easy to regulate, and the UV exposure is not easy control, causes easily the problems such as surface chromatic aberration.

Summary of the invention

Therefore, the object of the invention is to address the above problem, a kind of manufacture method of light guide plate is provided.

The invention provides a kind of manufacture method of light guide plate, comprising: 1) apply the UV hardening resin in light conducting plate body; 2) with this UV hardening resin of die marks; 3) demoulding forms the pattern with the mold shape complementation in the UV hardening resin; 4) under ultraviolet light, the UV hardening resin is exposed, make the sclerosis of UV hardening resin.

According to method provided by the invention, the pattern that wherein forms in described UV hardening resin is scattering pattern, diffusion patterned, prism pattern or blast pattern.

According to method provided by the invention, wherein to comprise mass percent be 10～20% MMA to the UV hardening resin on light conducting plate body, and 10～20% trimethylolpropane triacrylate, the light trigger below 5%, all the other are solvent.

According to method provided by the invention, wherein the thickness of coated UV hardening resin is 20 microns to 200 microns.

According to method provided by the invention, wherein the material of light conducting plate body is PMMA, PC or glass.

It is a kind of according to light guide plate described above that the present invention also provides.

The present invention also provides a kind of device of making light guide plate, comprising:

Pressure roller on the primary importance;

Travelling belt has impressing mould on it;

UV light source on the second place,

Wherein pressure roller drives the UV hard resin-layer on the light guide plate that travelling belt rotated and drove impressing mould extrusion coated on the travelling belt and have the UV hardening resin, with the pattern of formation in the UV hardening resin with the mold shape complementation, light guide plate is sent to the second place after being pushed by pressure roller, and by the UV light source on the second place UV resin on the light guide plate is exposed.

The present invention also provides liquid crystal display, the planar lamp that comprises above-mentioned light guide plate.

Among the present invention, changed the order of exposure and the demoulding, the UV exposure is carried out in the first demoulding again, the first UV again demoulding that exposes in the prior art, the position of exposure light source is unrestricted, the easier adjusting of the angle of exposure, the easier control of exposure can prevent the formation of surface chromatic aberration.

Description of drawings

Embodiments of the present invention is further illustrated referring to accompanying drawing, wherein:

Fig. 1 a and 1b are the structural representation of existing light guide plate;

Fig. 2 is the process flow diagram according to the manufacture method of existing light guide plate;

Fig. 3 is the process flow diagram according to the light guide plate of the method manufacturing of embodiments of the invention 1.

Fig. 4 is the structural representation according to the light guide plate of the method manufacturing of embodiments of the invention 2;

Fig. 5 is the structural representation according to device of the present invention.

Embodiment

The invention provides a kind of manufacture method of light guide plate, impression (Imprint) method is in the past improved.

Describe the present invention below in conjunction with drawings and Examples.

Embodiment 1

Present embodiment provides a kind of manufacture method of light guide plate, as shown in Figure 3, comprising:

Apply the UV hardening resin in the light conducting plate body made by PMMA, the composition of this UV hardening resin comprise mass percent be 15% MMA (PropyleneThe acid methyl esters), 20% trimethylolpropane triacrylate, 2% light trigger (Photoinitiator), 63% solvent;

With this UV hardening resin of die marks;

The demoulding forms the scattering pattern with the mold shape complementation;

Under ultraviolet light, the UV hardening resin is exposed, make the sclerosis of UV hardening resin, to form final scattering pattern in light conducting plate body.

Among the present invention, changed the order of exposure and the demoulding, the UV exposure is carried out in the first demoulding again, the first UV again demoulding that exposes in the prior art, the position of exposure light source is unrestricted, the easier adjusting of the angle of exposure, the easier control of exposure can prevent the formation of surface chromatic aberration.

Among the present invention, composition to the UV hardening resin that adopts is optimized, the scope of the ratio of each composition is preferably that (mass percent is 10～20% MMA, 12～20% trimethylolpropane triacrylate, the light trigger below 5% (Photoinitiator), all the other are solvent.Under this component ratio, the formation of pattern is more stable.

In other embodiments, also can adopt the UV hardening resin of other compositions to carry out method for stamping among the embodiment, the mode by the first demoulding, again UV exposure forms scattering pattern.

Among the present invention, the thickness of coated UV hardening resin is preferably 20 microns to 200 microns.

In other embodiments of the invention, can also utilize method that present embodiment provides to form diffusion patterned, prism pattern or blast pattern in light conducting plate body.

Embodiment 2

Present embodiment provides a kind of manufacture method of light guide plate as shown in Figure 4, comprising:

The first side in light conducting plate body applies the UV hardening resin;

With the UV hardening resin of the first side of the die marks light conducting plate body with raised design, to form scattering pattern;

The demoulding;

Under ultraviolet light, the UV hardening resin on the first side of light conducting plate body is exposed, make UV hardening resin sclerosis, thereby form the recess patterns with the mold shape complementation in the UV hardening resin on the first side of light conducting plate body, as the scattering layer of light guide plate;

Second side opposite with the first side in light conducting plate body applies the UV hardening resin;

Use again the UV hardening resin of the second side of the die marks light conducting plate body with recess patterns, diffusion patterned to form;

The demoulding;

Under ultraviolet light, the UV hardening resin on the second side of light conducting plate body is exposed, make UV hardening resin sclerosis, thereby form the raised design with the mold shape complementation in the UV hardening resin on the second side of light conducting plate body, as the diffusion layer of light guide plate.

The formed light guide plate of the present invention as shown in Figure 4, the lower surface of this light guide plate has a plurality of depressions, a plurality of depressions consist of scattering pattern.The upper surface of this light guide plate has a plurality of projections, and these a plurality of projections consist of diffusion patterned.

The present invention can adopt the equipment shown in Fig. 5 to make, the impressing mould that utilizes pressure roller to drive on the travelling belt impresses the UV hardening resin that applies on the light guide plate, behind the impression, light guide plate is conveyed into position shown in dotted lines in Figure 5, because the pressure of pressure roller is removed, impressing mould breaks away from the UV hardening resin (being the demoulding) that applies on the light guide plate, then carries out the UV exposure under the UV light source again at the dotted line position place shown in Fig. 5, thereby makes the UV hardening of resin.

In above-described embodiment, light guide plate also can be formed by other materials, such as PC, glass, optical sheet etc.

Not only liquid crystal display can be used for according to light guide plate of the present invention, the planar light sources such as LED planar lamp can also be used for.

Should be noted that at last, above embodiment is only in order to describe technical scheme of the present invention rather than the technical program is limited, the present invention can extend to other variation, modification, application and enforcement on using, and therefore thinks that all such variations, modification, application and enforcement are all in spirit of the present invention and teachings.

Claims (8)

1. the manufacture method of a light guide plate comprises:

Step 1 applies the UV hardening resin in light conducting plate body;

Step 2 is with this UV hardening resin of die marks;

Step 3, the demoulding forms the pattern with the mold shape complementation in the UV hardening resin;

Step 4 is exposed to the UV hardening resin under ultraviolet light, makes the sclerosis of UV hardening resin.

2. method according to claim 1, the pattern that wherein forms in described UV hardening resin are scattering pattern, diffusion patterned, prism pattern or blast pattern.

3. method according to claim 1, wherein to comprise mass percent be 10～20% MMA to the UV hardening resin on light conducting plate body, 10～20% trimethylolpropane triacrylate, the light trigger below 5%, all the other are solvent.

4. method according to claim 1, wherein the thickness of coated UV hardening resin is 20 microns to 200 microns.

5. method according to claim 1, wherein the material of light conducting plate body is PMMA, PC or glass.

6. light guide plate that the described method of each claim in according to claim 1-5 is made.

7. device of making light guide plate as claimed in claim 6 comprises:

Pressure roller on the primary importance;

Travelling belt has impressing mould on it;

UV light source on the second place,

Wherein pressure roller drives the UV hard resin-layer on the light guide plate that travelling belt rotated and drove impressing mould extrusion coated on the travelling belt and have the UV hardening resin, with the pattern of formation in the UV hardening resin with the mold shape complementation, light guide plate is sent to the second place after being pushed by pressure roller, and by the UV light source on the second place UV resin on the light guide plate is exposed.

8. the liquid crystal display, the planar lamp that comprise light guide plate according to claim 6.

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