KR20140030712A - A light scattering lens for planar light source device of liquid crystal displays - Google Patents

Abstract

The present invention relates to a light scattering lens for a planar light source device of a liquid crystal display and, more specifically, to a light scattering lens for a planar light source device of a liquid crystal display capable of preventing a moire phenomenon by providing the light scattering lens which easily scatters a light source of the planar light source device in order that the planar light source device generates light having uniform brightness. The light scattering lens comprises a light source groove and a light induced inclined unit. The light source groove is formed on the lower side of the light scattering lens and scatters the light of the light source. The light induced inclined unit is formed on the upper side of the light scattering lens as a cone shape and reflects the light of the light source groove. The light scattering lens is formed as a cylinder shape. The middle diameter between the upper side and the lower side is shorter than the upper side diameter of the upper side and the lower side diameter of the lower side.

Description

[0001] The present invention relates to a light scattering lens for a planar light source device of a liquid crystal display,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light scattering lens for a surface light source device of a liquid crystal display, and more particularly, to a surface light source device for use in a liquid crystal display, To a light scattering lens for a surface light source device of a liquid crystal display capable of preventing a moire phenomenon or the like by providing a light scattering lens which can easily scatter light.

BACKGROUND ART [0002] Recently, panels such as liquid crystal displays are mainly used as a back light for direct light illumination in a direct lighting type or an edge lighting type. Such an edge-type backlight for liquid crystal display is characterized in that light is emitted from the side of the liquid crystal display device and uniformly dispersed in the front surface of the backlight by using a reflection plate and a diffusion sheet to generate uniform light from the backlight When such an edge method is used, the light source used for the liquid crystal display is provided on the side surface of the liquid crystal display, so that the thickness of the product can be reduced.

On the other hand, a direct-type backlight for a liquid crystal display is characterized in that light emitted from a plurality of light sources provided on a lower surface of a liquid crystal display device is uniformly dispersed on a front surface of a backlight using a reflection plate and a diffusion sheet to generate uniform light When such a direct method is used, there is a characteristic that a light of high luminance can be produced in a backlight even with a small light source.

However, the demand for enlarging liquid crystal displays has increased in recent years, and such edge-type backlight light sources have limitations in improving brightness and luminance uniformity. Therefore, the application of a direct lighting type light to a large liquid crystal display is under consideration.

Accordingly, a direct light type backlight source has been proposed in which a plurality of LEDs are arranged at a constant pitch below the liquid crystal panel.

FIG. 1 is a block diagram illustrating a backlight source according to a prior art. Referring to FIG. As shown in Fig. 1, a plurality of LED lamps 12 are arranged at a constant pitch in an array pattern on the bottom surface of the housing 11, with respect to the backlight light source 10 of the direct-

The diffusion member 17 is disposed at a certain distance from the LED lamp 12 and is disposed on the upper surface of the housing 11 and the prism sheet 18 is disposed on the upper surface of the diffusion sheet 17, 10). Reflecting portions 14 and 16 made of a reflective sheet or the like are formed on the bottom surface 13 and the side surface 15 of the housing 11.

For a direct-type backlight source 10 configured as described above, when light is emitted from the LED lamp 12, the emitted light travels directly toward the diffusion sheet 17. [ The emitted light is also reflected by the reflective portions 14 and 16 on the bottom surface 13 and the side surface 15 of the housing 11 and moves toward the diffusion sheet 17.

The light that has entered the diffusion sheet 17 is then diffused in the diffusion sheet 17 and is directed vertically by passing through the prism sheet 18 on the upper surface of the diffusion sheet 17. The light then enters a liquid crystal panel (not shown) disposed over the top surface of the prism sheet 18. [

Furthermore, the light emitted from the LED lamp 12 is mixed in the space between the LED lamp 12 and the diffusion sheet 17. This mixing is then promoted by diffusion in the diffusion sheet 17, thereby achieving uniform brightness and uniform chromaticity. Furthermore, in general, the luminance in the section immediately above the LED lamp 12 is higher than the other sections. Therefore, the uniformity in luminance can be further improved by increasing the diffusing property of the diffusion sheet 17 in the section directly above the LED lamp 12.

For a conventional direct-type backlight source 10, the diffusion sheet 17 is disposed off the LED lamp 12 to equalize brightness and chromaticity as described above. However, even in such a case, the above-mentioned means have a disadvantage in not solving the problem that the luminance in the section immediately above the LED lamp 12 becomes higher.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a light guide member for use in a surface light emitting device in which brightness of light away from a light source is reduced, , And changing the light path by the first to seventh order, so that the light irradiated from the light source can be generated uniformly in brightness and high brightness on the front surface of the surface light emitting device.

In addition, the present invention is configured so that the side surface of the light scattering lens is formed of two inclined surfaces (the first lens portion and the second lens portion), and the light incident on the various optical paths by the first through fifth surfaces There is another purpose to make it possible to emit uniformly to the side.

In addition, the present invention is a method for diffusing light radiated from a light source evenly into a light scattering lens while passing through light source grooves (first groove portion and second groove portion) that are first and secondly recessed in a cylindrical and hemispherical shape, Another object of the present invention is to generate light having a uniform luminance at the front surface of the light emitting device.

In addition, the present invention provides a light guiding inclined portion which is recessed in a conical shape in the direction of the light source from the upper surface of the light scattering lens, so that light emitted from the light source groove is formed at two angles (first inclined portion and second inclined portion) And the light is guided to the surface of the light induction slope so that light having a uniform brightness is generated on the front surface of the surface light emitting device.

It is another object of the present invention to provide a light scattering lens capable of preventing a moire phenomenon occurring in a surface light source device.

According to an aspect of the present invention, there is provided a light scattering lens comprising: a light source groove formed on a lower surface of the light scattering lens to diffuse light emitted from the light source; Wherein the light scattering lens is formed in a cylindrical shape, and a middle diameter between the upper surface and the lower surface is larger than an upper surface diameter of the upper surface and a lower surface diameter of the lower surface of the light scattering lens. And a light scattering lens for a surface light source device of a liquid crystal display.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a surface light emitting device in which light irradiated from a light source is uniformly distributed So that one brightness and high brightness lock can be generated.

In addition, the present invention is characterized in that light incident on various light paths by first to fifth differences in the light scattering lens is incident on two types of lenses (first lens unit and second lens unit) formed on the light scattering lens, So that the light can be uniformly emitted toward the side surface of the light scattering lens.

In addition, the present invention provides a light emitting device that uniformly diffuses light emitted from a light source into a light scattering lens while passing through light source grooves (first and second groove portions) recessed in a cylindrical and hemispherical shape, There is another effect that light having one luminance can be generated.

In addition, the present invention provides a light guiding inclined portion which is recessed in a conical shape from the upper surface of the light scattering lens toward the light source, so that light emitted from the light source groove is formed at two angles (a first inclined portion and a second inclined portion) There is another effect that light having a uniform luminance can be generated on the front surface of the surface emitting device by being reflected from the surface of the light guide slope portion.

In addition, the present invention has another effect of preventing a moire phenomenon occurring in the surface light source device using a light scattering lens.

FIG. 1 is a view illustrating a backlight source according to a prior art,
FIG. 2 is a front view showing a light scattering lens according to the present invention, FIG.
3 is a cross-sectional view illustrating a light scattering lens according to the present invention,
FIG. 4 is a perspective view showing a light scattering lens according to the present invention, FIG.
5 is a cross-sectional perspective view illustrating a light scattering lens according to the present invention,
FIG. 6 is a diagram illustrating a light path of a light scattering lens according to the present invention. FIG.
FIG. 7 is a block diagram showing an embodiment in which the light scattering lens according to the present invention is applied to a liquid crystal display. FIG.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

Hereinafter, preferred embodiments of the present invention will be described in detail.

FIG. 2 is a front view showing a light scattering lens according to the present invention, FIG. 3 is a cross-sectional view showing a light scattering lens according to the present invention, FIG. 4 is a perspective view showing a light scattering lens according to the present invention And FIG. 5 is a cross-sectional perspective view illustrating a light scattering lens according to the present invention. 2 to 5, the light scattering lens 100 used as the surface light source device of the liquid crystal display is positioned above the substrate 210 on which the light source is mounted, and the substrate 210 has one or more A light source 220 is provided.

The light source 220 may be a light emitting diode (LED) light source, and the number of the light sources 220 may be one or more depending on the area of the surface light source device.

A light source groove 110 through which a light source 220 protruding from the substrate 210 can be inserted is formed on the lower surface of the light scattering lens 100 provided on the substrate 210. The light source groove 110 is formed by combining two shapes.

The first is a first groove 111 embedded in the shape of a cylinder from the lower surface of the light scattering lens 100 and a second groove 111 embedded in a hemispherical shape from the bottom of the first groove 111. [ A first groove portion 111 and a second groove portion 112 are integrally formed.

The light source groove 110 is preferably formed of a cylindrical first groove 111 and a hemispherical second groove 112. In order to change the path of the light emitted from the light source 220, , A prism, or the like.

That is, the light source groove 110 formed of the cylindrical first groove portion 111 and the hemispherical second groove portion 112 is formed by the light emitted from the light source 220 into the first groove portion 110 formed in the recessed light source groove 110, Scattering lens 100 through the surfaces of the first and second trenches 111 and 112. However, it may be formed in a size that allows the light source 220 to be inserted.

A light induction slope part 120 is formed on an upper surface of the light scattering lens 100 corresponding to the light source groove 110 to reflect light emitted from the light source groove 110 at various angles. The light guiding inclined portion 120 is formed by being embedded in a cone shape and the inclined angle for changing the path of the light emitted from the light source groove 110 may be formed at two or more.

2 to 5, the light guiding slope part 120 is formed in a shape of a cone, which is recessed on the upper surface of the light scattering lens 100 corresponding to the light source groove 110 120 are recessed at a first angle toward the light source 220 and the light induction slope 120 is recessed at a second angle from the end point that is recessed at the first angle toward the light source, To form a structure that is recessed at two angles.

Accordingly, the conical shape that is recessed at the first angle is the first inclined portion 121, and the conical shape that is recessed at the second angle from the end point of the first inclined portion 121 is the second inclined portion 122. At this time, it is preferable that the second angle of the second inclined portion 122 is formed larger than the first angle of the first inclined portion 121.

The light emitted from the light source groove 110 is diffused into the light scattering lens 100 and the first inclined portion 121 and the second inclined portion 121 of the light induction slope 120 formed on the light source groove 110 122, respectively, and the reflected light is diffused while being reflected inside the light scattering lens 100.

The light scattering lens 100 includes a first lens unit 101, which is a conical upper structure, and a second lens unit 102, which is a conical lower structure. The cone-shaped first lens portion 101 has a diameter decreasing from the upper surface to the lower surface, and the cone-shaped second lens portion 102 has a diameter decreasing from the lower surface toward the upper surface.

That is, the diameter of the light scattering lens 100 where the first lens 101 and the second lens 102 are in contact is smaller than the diameter of the upper surface and the diameter of the lower surface, The shape of the circle represents the shape of a mortar.

In this case, the first lens unit 101 and the second lens unit 102 are merely described separately in terms of their functions and functions, and it is preferable that the shape of the light scattering lens 100 is integrally formed. The diameter of the top surface of the light scattering lens 100 may be greater than or equal to the bottom diameter and the bottom diameter may be larger than the middle diameter of the first lens portion 101 and the second lens portion 102.

The height of the first lens part 111 of the light scattering lens 100 is higher than the height of the second lens part 112 and the height of the light source formed on the second lens part 112 on the lower surface of the light scattering lens 100 It is preferable that the depression depth of the groove is smaller than the height of the second lens portion 112.

The light emitted from the light source 220 located in the light source groove 110 can control the light path seven times in the light scattering lens 100. That is, the light emitted from the light source 220 located in the light source groove 110 formed on the lower surface of the light scattering lens 100 is changed in light path on the side surface and the upper surface of the cylindrical first groove portion 111, The light path is changed in the shape of the hemispherical shape of the second groove part 112 of the shape of the light guide slope part 120 and the light path is changed in the first slope part 121 and the second slope part 122 of the light induction slope part 120, The light path is changed on the inclined outer surface of the first lens portion 101 and the second lens portion 102 of the lens 100. [

Accordingly, light whose path has been changed in each configuration is output through various light paths to the side of the light scattering lens 100 and is reflected by a reflector (not shown) formed around the light scattering lens 100 to supply uniform light .

FIG. 6 is a view illustrating a light path of a light scattering lens according to the present invention. 6, light emitted from a light source (not shown) passes through the first groove portion 111 formed in the cylindrical shape of the light source groove 110 and the upper and side surfaces of the second groove portion 112 formed in the hemispherical shape And the light emitted to the upper side of the light source groove 110 of the light diffusion lens 100 is reflected by the light induction slope part 120.

The light guiding inclined portion 120 is configured to be conically recessed from the upper surface of the light diffusion lens 100 toward the light source. The light guiding inclined portion 120 is inclined at a first inclination Is reflected by the side surface of the light scattering lens 100 and is incident on the light source groove 110. The light incident on the light source groove 110 is reflected by the first inclined portion 121 and reflected by the side surface of the light scattering lens 100, 2 inclined portion 122 and is reflected to the side surface of the light scattering lens 100. [

The light reflected through the surfaces of the first inclined portion 121 and the second inclined portion 122 is reflected by the side surface of the light scattering lens 100 and is reflected by the first lens portion 101 of the light scattering lens 100, The light that is diffused by the optical path through the outer peripheral surface of the second lens unit 102 and diffused in various paths enters the upper surface of the light scattering lens 100 at a predetermined incident angle, So that the light is output to the upper surface.

That is, the light irradiated from the light source is subjected to the first light path change in the first groove portion 111 of the light source groove 110, and the second light path and the third light path The fourth optical path is changed at the second inclined portion 122 of the light induction slope portion 120 and the fifth optical path is changed at the first inclined portion 121. [

Light of various paths to be incident on the side surface of the light scattering lens 100 through the first to fifth optical paths is changed in the sixth optical path in the first lens unit 101, 7 The optical path is changed.

Accordingly, the light emitted from the light source is uniformly emitted to the side while being reflected inside the light scattering lens 100, and the light emitted to the side of the light scattering lens 100 is provided around the light scattering lens 100 And can be uniformly diffused by a reflector (not shown).

FIG. 7 is a block diagram showing an embodiment in which the light scattering lens according to the present invention is applied to a liquid crystal display. FIG. 7 (a) shows that the light scattering lenses matched to one light source are arranged in a plurality of horizontal and vertical directions and used as a surface light source device of a liquid crystal display.

FIG. 7 (b) shows that the light scattering lenses forming the surface light source device are staggered in the longitudinal direction and used as a surface light source device of a liquid crystal display with a large area through a small number of light scattering lenses.

7A and 7B illustrate the position of a light scattering lens applicable to a display according to an exemplary embodiment. It is preferable that the light scattering lens can be applied to a display by changing the position of the light scattering lens according to various embodiments. Do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

100: light scattering lens 101: first lens portion
102: second lens unit 110: light source groove
111: first groove portion 112: second groove portion
120: a light induction slope part 121: a first inclined part
122: second inclined portion 210: substrate
220: Light source

Claims (10)

In the light scattering lens,
A light source groove recessed in a lower surface of the light scattering lens to diffuse light emitted from the light source; And
It is formed in a concave shape on the upper surface of the light scattering lens, the light induction inclination for reflecting the light incident from the light source groove
, ≪ / RTI >
The light scattering lens is formed in a cylindrical shape, the light scattering lens for a surface light source device of the liquid crystal display, characterized in that the intermediate diameter between the upper surface and the lower surface is smaller than the upper surface diameter of the upper surface and the lower surface diameter of the lower surface.
The method of claim 1,
The light source groove includes a first groove portion recessed in a cylindrical shape on a lower surface of the light scattering lens and a second groove portion recessed in a hemispherical shape having a predetermined diameter from a bottom surface of the first groove portion. Light scattering lens for surface light source device.

The method of claim 1,
The light guide inclination part includes a first inclination part recessed at a first angle on an upper surface of the light scattering lens and a second inclination part recessed at a second angle from an end of the first inclination part. Light scattering lens for the device.
The method of claim 1,
And the light scattering lens comprises a first lens portion from the upper surface to the median diameter and a second lens portion from the lower surface to the median diameter.
5. The method of claim 4,
The height of the first lens portion is higher than the height of the second lens portion, the light scattering lens for the surface light source device of the liquid crystal display.
The method of claim 5, wherein
The light scattering lens for the surface light source device of the liquid crystal display, characterized in that the recessed depth of the light source groove is smaller than the height of the second lens portion.
The method of claim 3, wherein
And a second angle of the second inclined portion is greater than a first angle of the first inclined portion.
The method of claim 1,
And the light source is located in the light source groove.
The method of claim 1,
Wherein the upper surface diameter of the light scattering lens is larger than the lower diameter of the light scattering lens.
5. The method according to any one of claims 2 to 4,
The light irradiated from the light source is one of the first inclined portion and the second inclined portion of the light source groove, the first inclined portion and the second inclined portion, and an outer circumferential surface of the first lens portion and an outer circumferential surface of the second lens portion. The light scattering lens for the surface light source device of the liquid crystal display, characterized in that the light path is changed in at least one.

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