KR20110021127A - Optical component, manufacturing method of the same and backlight module - Google Patents

Abstract

PURPOSE: An optical component, a manufacturing method thereof, and a backlight module are provided to effectively remove a moire phenomenon of an optical component. CONSTITUTION: A micro structure(22) includes one top margin. The top margin is placed on a light emitting surface. The top margin forms at least one adjacent first curve and at least one second curve. The first and second curves are expanded in the first direction. A reflection structure(23) is expanded in the first direction and arranged on an incident side in the second direction. Two connection points of two micro structures correspond to each other.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component, a manufacturing method thereof, and a backlight module,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component, a manufacturing method thereof, and a backlight module, and more particularly, to a method of manufacturing an optical component having a microstructure and a reflective structure, and a backlight module.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a partial cross-sectional view of a Brightness Enhanced Film in US 7309149. Referring to FIG. 1, the incident surface 12 'of the brightness enhancement film 1' includes a reflective structure 13 'and includes a first light ray L1, a second light ray L2, and a third light ray L3 Is incident on the incident surface 12 'of the brightness enhancement film 1', the first light ray L1 is refracted toward the front surface of the brightness enhancement film 1 ', and the second light ray L2 is refracted Is reflected at the structure 13 'and the third ray L3 is reflected by the reflective structure 13' or the prism unit 11 '. The reflected second light L2 and the third light L3 are again reflected by a reflector plate (not shown) at the bottom of the brightness enhancement film 200 to reflect the second light L2 and the third light L3 Make it available again.

The light incident on the incident surface is not easily refracted to the side of the brightness enhancement film 1 'due to the installation of the reflective structure 13', and a relatively high brightness when viewed from the front of the brightness enhancement film 1 ' I can feel it.

In US 7309149, the area of the standard reflective structure 13 'is less than or equal to two thirds of the distance between the prism units 11. However, the spacing and thickness of the reflective structure 13 ' are not standardized, and therefore, those skilled in the art can not make further optimized designs according to US7309149. In addition, the prism units 11 and 11 'are all arranged in parallel to each other in the brightness enhancement films 1 and 1', and the pixel electrodes on the liquid crystal panel are arranged in parallel to each other It is easy to form a moire pattern in the visual aspect.

Therefore, solving the above problem is a part to be considered by those skilled in the art.

It is an object of the present invention to provide an optical component which effectively removes the moire phenomenon of the optical component and at the same time standardizes the interval and the thickness of the reflection structure so that the technician in the technical field can make an optimized design.

According to another aspect of the present invention, there is provided an optical component comprising a light emitting surface and an incident surface, and a light beam emitted by the at least one light source on the incident surface side, Thereby forming an optical path. The optical component includes a plurality of microstructures and a plurality of reflective structures, wherein the microstructures extend in one first direction and are arranged on the light emitting surface along one second direction. All microstructures have a top margin, which is located on the light emitting surface and forms a plurality of adjacent first curves and a plurality of second curves. Wherein the first curve and the second curve extend in a first direction and distances of the first curve and the second curve in the second direction are different and not parallel, The distances in the second direction are different and not parallel.

Further, all the reflection structures extend along the first direction and are arranged on the incident surface along the second direction, and the positions of all the reflection structures and the connection points of the two microstructures correspond to each other. (T) from the reflection structure to the incident surface, the length of the micro structure in the second direction is the width (P), and the refractive index (n) of the optical component is

It satisfies the following formula.

Here, the optical path is incident on the incident surface of the optical component, the thickness of the reflecting structure is used to control the optical path, and the microstructure of the emitting surface is used to converge the optical path.

Wherein the curvature radius of the arc is R, the distance between the first curve and the second curve in the second direction is D, and R and D are coordinates 0.5R < D < 3R.

를 만족시킨다.In the optical component, the width of the focal point (FD) of the microstructure and the bottom of the microstructure is P,

.

Based on the above object and other objects, the present invention is used to manufacture the optical component by providing a method of manufacturing the optical component, and the manufacturing method of the optical component includes the following steps. First, one transparent substrate is provided, and molded plastic is applied to one portion of the transparent substrate. Also, a mold is provided, wherein the surface of the mold has a plurality of molding patterns, and the outline of such molding patterns and the microstructure of the optical components correspond to each other. Next, the mold is stamped on the molded plastic, and the molded plastic on which the mold is stamped is cured to form a microstructure. Then, a photoresist is applied to the other side of the transparent substrate, the photoresist is exposed to light to form an image region through a process of displaying an image, Remove. Next, a layer of reflective material is applied, and the photoresist in the structural region and the reflective material layer thereon are removed to form a reflective structure.

Based on the above objects and other objects, the present invention provides a backlight module, wherein the backlight module includes one optical thin plate, at least one light source, and an optical component. The optical component is located on the light emitting surface side of the optical thin plate.

In the backlight module, the optical thin plate is one diffusion plate or one light guide plate.

In the backlight module, the light source is a cold cathode fluorescent lamp or a light emitting diode.

Compared with the existing technology, the optical component of the present invention effectively removes the moiré pattern, while at the same time, the present invention allows the technicians in the art to optimize the design by standardizing the spacing and thickness of the reflective structure.

In order that the above objects, features and advantages of the present invention become more apparent, the present invention will be described in detail with reference to embodiments and drawings.

Although the x-axis direction is the second direction and the y-axis direction is the first direction in the following embodiments, those skilled in the art will appreciate that this is for convenience of description and is not limited to the first direction and the second direction You should know.

2 is a perspective view of an optical component according to the first embodiment of the present invention. Referring to FIG. 2, the optical component 2 is generally in the form of a thin plate, and is disposed above the diffusion plate of the direct-type backlight module, that is, positioned on the light-emitting surface side of the diffusion plate. Here, the light emitting surface 21 of the optical component 2 has a plurality of microstructures 22, and such microstructures 22 are arranged on the light emitting surface 21 along the x direction, 22 have one top margin 221. [ Here, the microstructure 22 is used to converge the optical path of the light beam.

A plurality of reflective structures 23 are provided on the incident surface 24 of the optical component 2 and the reflective structures 23 are arranged on the incident surface 24 along the x direction and the reflective structures 23 ) Is made of titania or magnesia. In addition, the position of all reflective structures 23 correspond to waveforms 222 formed between two microstructures 22. Here, it is assumed that a thickness t is provided from all of the reflection structures to the incident surface, the length of the microstructure in the x-axis direction is the width P, the refractive index of the optical component 2 is n, .

공식(1)

Formulas (1)

2, the partial light beam L4 is incident on the incident surface 24, a portion of the light beam L5 is reflected by the reflective structure 23 and the thickness t of the reflective structure 23 is & To control the optical path of the light beam. In addition, the microstructure 22 of the light emitting surface 21 can converge the optical path of the light ray L4.

Referring to Figures 2 and 3, Figure 3 shows a number of curves formed by the projection of the top margin in the xy plane. 2, the microstructure 22 basically extends in the y-direction, and the extension path of the microstructure 22 is curved. When the top margin 221 of the microstructure 22 is projected on the xy plane, a plurality of different curves are formed, and curves at odd positions counted from the left are referred to as first curves 2211, Is referred to as a second curve 2212. It should be noted that the classification of the curve into the first curve 2211 and the second curve 2212 is for convenience of explanation and that all the first curves 2211 have the same curve shape or all the second curves 2212 ) Does not have the same curve shape.

In the first curve 2211 and the second curve 2212 in Fig. 3, the first curve 2211 and the second curve 2212 are not parallel. Here, all the second curves 2212 are located between the two first curves 2211, and the distance between one of the first curves 2211 and the second curve 2212 is D1, The distance between the first curve 2211 and the second curve 2212 is D2. Here, the distance D1 and the distance D2 vary along the y direction, and the distance D1 and the distance D2 are different from each other.

The contour of the vertical cross section of the microstructure 22 is one arc, and the radius of curvature of the arc is R. The distance D1 or D2 is collectively referred to herein as D, and the relationship with the radius of curvature R can be expressed by the following formula.

0.5R < D < 3R Formula (2)

In addition, the focus of the microstructure is FD (not shown), which satisfies the following formula.

공식(3)

Formula (3)

Since the pixel electrodes on the liquid crystal panel are also arranged in parallel to each other, the extension path of the micro structure 22 in this embodiment is a curve, and a moiré pattern is not easily formed visually.

The applicant of the present invention has conducted a computer simulation of the optical component 2 in which the width P at the bottom of the microstructure 22 is set to 185 μm and the refractive index of the optical component 2 (n) was 1.63, and the following table was obtained with the thickness t of the reflecting structure 23 as a variable.

Simulation state One 2 3 4 5 Thickness (t) (μm) 43 33 20 13 4 burglar 0.68 0.83 1.0 1.0 1.0 1/2 time (degrees) 12.4 14.1 16.5 17.8 19.4

In the table, "intensity" represents the intensity of light as viewed from the front of the optical component 2, "1/2 time" represents the angle of view when the light intensity is 1/2 of the light intensity . Simulation states 1 and 2 do not satisfy formula (1), and simulation states 3 to 5 satisfy formula (1).

Thus, in light of the above, it will be appreciated by those skilled in the art that the thickness of the reflective structure 23 can be used to control the optical path of the light beam, and when the design of the optical component 2 satisfies formula (1) Effect can be obtained.

The manufacturing method of the optical component 2 will be described with reference to Figs. 4A to 4E. 4A, a molding plastic 22 'is applied to one side of one transparent substrate 25, and the material of the transparent substrate 25 is polycarbonate, polyethylene naphthalate (PEN) Or polyethylene terephthalate (PET), and the molded plastic 22 'is an ultraviolet hardening plastic or a thermosetting plastic.

In the roller 4, the surface 41 is provided with a plurality of forming patterns (not shown), and the outline of the forming pattern is formed by the micro structure 22 (as shown in Fig. 2) of the optical component 2 ). In other words, the microstructure 22 shows a protruding shape, and the molding pattern shows a concave downward shape and can be supplemented with each other.

Next, referring to FIG. 4B, when the roller 4 is stamped on the molded plastic 22 ', the molded plastic is cured to form the microstructure 22 on the transparent substrate 25. For example, if the molded plastic 22 'is an ultraviolet ray hardening plastic, it is possible to form the molded plastic 22' in the light of ultraviolet rays, and if the molded plastic 22 ' If it is a hardened plastic, it can be molded by heating. Further, in this embodiment, the roller 4 is stamped on the molded plastic, but the skilled artisan can use the rollers 4 in other forms.

Next, referring to FIG. 4C, a photoresist is applied to the other side of the transparent substrate 25 after the microstructure 22 is manufactured, and a structure region 261 is formed after an image is displayed by illuminating light And removes the photoresist outside the structure region 261 using the chemical agent, leaving only the structure region 261.

Next, referring to FIG. 4D, a reflective material layer 23 'is applied, covering the structural region 261, and a photoresist of the structural region 261 and a reflective material layer (not shown) 0.0 &gt; 23 '. &Lt; / RTI &gt; Next, referring to FIG. 4E, the reflective structure 23 is formed by removing the photoresist of the structure region 261 and the reflective material layer 23 located thereon. After completing the fabrication of the reflective structure 23, the optical component 2 of the present invention is completed.

Referring to FIG. 5, FIG. 5 shows a direct-type backlight module of an optical component according to the present invention. The backlight module 5 includes one diffuser plate 51, a plurality of light sources 52, one reflecting housing 53 and the optical component 2 shown in Fig. 4, and the light source 52 is a cold cathode fluorescent lamp, and can be replaced with a light emitting diode. The light source 52 is installed in the reflection housing 53 and the reflection housing 53 reflects the light emitted by the light source 52 to the diffusion plate 51. The action of the diffusion plate 51 diffuses the light beam emitted by the light source 52 and the main constituent material of the diffusion plate 51 is a transparent material such as poly methyl methacrylate or polyethylene terephthalate. A plurality of light diffusion particles are dispersed in the diffusion plate 51 (not shown), and the refractive indexes of the light diffusion particles and the main constituent materials of the diffusion plate 51 are different from each other, When passing through the light-diffusing particles, the optical path can be deflected or distorted, and the effect of light diffusion can be seen.

In FIG. 5, the backlight module 5 is one direct-type backlight module, but the optical component 2 of the present invention can be used in other types of backlight modules such as a photometric backlight module. In the light measuring type backlight module, the optical component 2 is installed on the light guide plate.

The above description is an example of contents suitable for the present invention and is intended to explain the present invention and not to limit the present invention. Obviously, the present invention is not limited to the previously described execution modes, but can also display a variety of other phenomena. Those skilled in the art will be able to make various changes and devise many other variations that do not depart from the spirit and scope of the invention.

1 is a partial cross-sectional view of a brightness enhancement film of US7309149.

2 is a view showing an optical component of a first embodiment according to the present invention.

3 is a diagram showing projection of the top margin in the xy plane.

4A to 4E are views showing a method of manufacturing an optical component.

5 is a view showing a backlight module of a first embodiment according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1, 1 ': brightness enhancement film 11, 11': prism unit

13 ': reflection structure L1, L2, L3: first light, second light, third light

2: Optical component 21: Light emitting surface

22: Microstructure 22: Molded plastic

221: Top margin 222-Waveform

2211, 2212: first curve, second curve 23-reflection structure

23 '; Reflective material layer; 24: incidence plane

25: transparent substrate 261: structure region

4: roller 41: surface

5: backlight module 51: diffusion plate

52: light source 53: reflective housing

R: radius of curvature t: thickness

P: Width n: Refractive index

D1, D2: distance L4, L5: ray

Claims (10)

An optical component having a light-emitting surface and an incident surface, wherein at least one light source emits at least one or more optical paths in the light incidence surface, One or more microstructures extending in one first direction and arranged in the light emitting surface along one second direction, wherein the microstructure has a top margin, Wherein the first and second curves form at least one first curve and at least one second curve that are located on the surface and are adjacent to each other, the first curve and the second curve extending in the first direction, and the first curve and the second curve Wherein the distance in the second direction is different and not parallel, and the distances in the second direction of the second curve and the other first curve are different and not parallel; And The first and second microstructures are arranged in the first direction and are arranged on the incident surface in the second direction, the two connection points of the two microstructures corresponding to each other, the thickness t to the incident surface, The length in the second direction is the width (P), the refractive index of the optical component is n,

And a reflective structure that satisfies the following condition: Characterized in that the optical path is incident on the incident surface and controls the optical path through the thickness of the one or more reflective structures and wherein the one or more microstructures on the emitting surface have a function of converging with respect to the optical path . The method according to claim 1, Wherein the cross-sectional profile of the microstructure in the longitudinal direction is an arc, the radius of curvature of the arc is R, and the distance between the first curve and the second curve in the second direction is D and satisfies the formula 0.5R <D <3R Wherein the optical component is made of a transparent material. The method according to claim 1, The width of the focal point (FD) of the microstructure and the bottom of the microstructure is P And the formula

Is satisfied. A method of manufacturing an optical component according to claim 1, Providing a transparent substrate material, comprising: applying molding plastic to one side of the transparent substrate material; Providing at least one molding pattern on the surface of the mold, wherein the outline of the at least one molding pattern and the microstructure of the optical component correspond to each other; Stamping the mold on the molded plastic and curing the molded plastic after stamping to form the microstructure; Applying a photoresist to the other side of the transparent substrate material; Exposing the photoresist to light to form an image region through a process of forming an image, and removing a portion of the photoresist that is not a structure region; Applying a layer of reflective material, and covering the structural region; And And removing the photoresist of the structural region and the reflective material layer of the structural region to form the reflective structure. Gt; 5. The method of claim 4, Wherein the reflective material layer is made of titania (TiO2) or magnesia (MgO). 5. The method of claim 4, Wherein the molded plastic is an ultraviolet curable plastic or a thermosetting plastic. 5. The method of claim 4, Wherein the material of the transparent substrate material is polycarbonate, polyethylene naphthalate (PEN), polyethylene glycol terephthalate (polyethylene glycol terephthalate), or the like. 4. The method according to any one of claims 1 to 3, One optical laminate; A backlight module including at least one light source positioned on an incident side of the optical thin plate; And Wherein the optical component is located on the light emitting surface side of the optical thin plate. 9. The method of claim 8, Wherein the optical thin plate is a diffusion plate or a light guide plate. 9. The method of claim 8, Wherein the light source is a cold cathode fluorescent lamp or a light emitting diode.

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