CN115808819A - Supporting integrated lens unit - Google Patents

Abstract

A lens unit is mounted on a substrate and uniformly emits light irradiated from a light source in a direction of a diffusion sheet. The disclosed lens unit includes an incident surface on the center of the light source, on which light emitted from the light source is incident; an exit surface allowing the incident light to be diffused and emitted in the direction of the diffusion sheet; integrally projected at a predetermined position on the emission surface, forming an air gap between the emission surface and the diffusion sheet, and including a support for supporting the diffusion sheet.

Description

Supporting integrated lens unit

Technical Field

The present invention relates to a lens unit capable of emitting light uniformly, and more particularly, to a lens unit in which a support is integrally formed.

Background

Unlike OLEDs, which can emit light, liquid Crystal Displays (LCDs) provide a light source using a backlight unit located at the back of the display. The backlight unit is mainly classified into an edge type and a direct type according to the installation position of the LED light source.

In the direct type backlight unit, a reflective sheet is mounted on a substrate (e.g., PCB) on which an LED array composed of a plurality of LEDs is mounted, and a lens unit, a diffusion sheet, a prism sheet, and a protective sheet are sequentially mounted on the reflective sheet. These substrate (e.g., PCB), reflective sheet, lens unit, diffusion sheet, prism sheet, and protective sheet are fixed by a mold frame serving as a housing. Such a direct type backlight unit provides light to a display area of a Liquid Crystal Display (LCD) of each area and controls the amount of light by selectively turning on and off an LED array because the LED array is installed below an optical member. ) Is possible. Therefore, there is an advantage of reducing power consumption while providing screen definition and high contrast.

On the other hand, in the direct type backlight unit, since the LEDs are positioned right under the liquid crystal display, a phenomenon (white point) brighter than other portions occurs around the point where the LEDs are positioned. In order to prevent such a white spot phenomenon, it is necessary to provide an air gap between the LED and the optical member or to increase the thickness of the optical member so that the light emitted from the LED is sufficiently diffused. Therefore, the thickness of the backlight unit is increased, and there is a limitation in slimness of the display panel.

Disclosure of Invention

(technical problem to be solved)

The present invention has been devised in view of the above circumstances and uniformly disperses light emitted from an LED light source to suppress a white spot phenomenon even when the distance between the light source and a liquid crystal panel is close, and an object of the present invention is to provide a support integrated lens unit having a structure that can be assembled at the time of molding.

(means for solving the problems)

In the present invention for achieving the above object, a plurality of light sources are mounted on a substrate arranged in row and column directions, and in a lens unit, the lens unit uniformly emits light emitted from each of the plurality of light sources in one direction. A diffusion sheet, the center of which is positioned on the light source, and an incidence surface on which the light emitted by the light source is incident; an exit surface for diverging and exiting the incident light in the direction of the diffusion sheet; it is integrally formed to protrude at a predetermined position of the exit surface, forms an air gap between the exit surface and the diffusion sheet, and may include a support for supporting the diffusion sheet.

The lens unit of the present invention includes a lens unit having a predetermined position of an incident surface corresponding to a predetermined position of the substrate, and a lens leg protruding into the predetermined position. The incident planes may be located on the substrate while being spaced apart by a predetermined height.

A plurality of lens legs may be provided, and each of the plurality of lens legs may be installed to be symmetrical from the center of the incident surface.

The incident surface may include a concave portion formed to be introduced onto the optical axis of the light source; the first reflection surface region is convex around the concave portion and opposite to the emission surface. The second reflecting surface area is positioned around the first reflecting surface area and forms a curved shape which is concave towards the emergent surface; the first inflection region is located at a connection portion between the first reflective surface region and the second reflective surface region.

The emission surface may include: a first emission surface region having a curved shape recessed toward the recess; and a second emission surface region located around the first emission surface region and having a convex curved surface shape facing the concave portion. It may comprise a second inflection region located at a junction between the first and second exit surface regions.

A plurality of supports may be provided, and each of the plurality of supports may be installed in at least one of the second inflection region and the second exit surface region to be symmetrical from the center of the exit surface.

(Effect of the invention)

The support-integrated lens unit according to the present invention may support the diffusion sheet in a state in which an air gap of a predetermined interval is formed between the support and the diffusion sheet by the support formed on the exit surface. Therefore, direct contact between the emission surface of the lens unit and the diffusion sheet is prevented, and the light emitted from the lens unit is spread and scattered to ensure uniformity of the light. In addition, since a structure for supporting a separate diffusion sheet is not required, assembly convenience may be additionally secured.

Further, the holder-integrated lens unit according to the present invention includes a lens leg which is inserted and fixed in a fixing groove formed on the substrate, so that the lens unit can be quickly mounted at a correct position on the substrate. And firmly fixing the lens. When external vibration occurs, the lens unit can be prevented from being separated from the substrate.

Drawings

Fig. 1 is a perspective view showing a supporting integrated lens unit according to an embodiment of the present invention from the front.

Fig. 2 is a rear perspective view of a support integrated lens unit according to an embodiment of the present invention.

Fig. 3 is a view illustrating a coupling relationship among a supporting integrated lens unit, a substrate, and a diffusion sheet according to an embodiment of the present invention.

Fig. 4 is a sectional view taken along line IV-IV of fig. 1.

Description of the symbols

1: light source 10: substrate

10a: fixing groove 50: diffusion sheet

100: lens unit

110: incident surface 113: first reflecting surface region

115: first inflection region 117: first reflecting surface region

130: exit surface 131: first exit surface area

133: second inflection region 135: second exit surface area

150: and (3) supporting 170: lens leg

190: light control pattern

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings. In the drawings, portions irrelevant to the description are omitted for clearly explaining the present invention, and the same reference numerals will be used to designate the same or similar components throughout the specification.

Fig. 1 and 2 are perspective views showing a supporting integrated lens unit according to an embodiment of the present invention from the front and rear, respectively, fig. 3 is a coupling relationship between the supporting integrated lens unit and a substrate and a diffuser fig. 4 is a sectional view taken along line IV-IV of fig. 1.

Referring to the drawings, a support integrated lens unit 100 according to an embodiment of the present invention will be mounted on a substrate 10 on which a plurality of light sources 1 are arranged in row and column directions, and light irradiated from the light sources 1 is uniformly emitted in the direction of a diffusion sheet 50. To this end, the lens unit 100 according to the present invention includes an incident surface 110, an exit surface 130, and a support 150.

The incident surface 110 is a surface on which light emitted from the light source 1 enters, the center of which is located above the light source 1. The exit surface 130 is formed on an opposite surface of the incident surface 110 such that light incident into the lens unit 100 is diffused and emitted in the direction of the diffusion sheet 50.

The support 150 integrally protrudes at a predetermined position of the exit surface 130, and forms an air gap g between the exit surface 130 and the diffusion sheet 50, and the diffusion sheet 50 supports the diffusion sheet 50.

A plurality of supports 150 may be provided, and each support may be installed to be symmetrical from the center of the emission surface 130. Further, each of the plurality of supports 150 may be installed in a second inflection region 133 and/or a second emission surface region 135, which will be described later. The shape of the support 150 may be variously changed. For example, the cross-sectional shape of the portion contacting the diffusion sheet 50 may be a triangular, rectangular or circular structure.

In addition, the present invention may further include a lens leg 170 protruding in a direction of the substrate 10 at a predetermined position of the incident surface 110. In this case, the fixing groove 10a is formed at a predetermined position of the substrate 10, and the lens leg 170 is fixedly installed in the fixing groove 10 a. Here, the lens leg 170 may include an insertion part 171, a fixing groove 10a coupled and inserted into the insertion part 171, and a spacer 175 positioned on the fixing groove 10 a. Accordingly, when the lens unit 100 is inserted into the fixing groove 10a formed on the substrate 10 and mounted, the lens unit 100 is spaced apart from the substrate 10 by a predetermined height, that is, the height of the spacer 175 may be positioned as it is, and as a method of firmly fixing the lens unit according to the present invention on the substrate 10, the adhesive P applied after the lens leg 170 is inserted into the fixing groove 10a on the substrate 10 may be more included. In this case, since the adhesive P permeates into the fixing groove 10a and the adhesive section of the lens is increased, the adhesive force can be enhanced.

Each of the lens legs 170 and the fixing grooves 10a is provided in plurality, and each of them may be installed to be symmetrical from the center of the incident surface 110 or the light source 1. Therefore, the lens unit 100 according to the present invention can be fixedly coupled to a correct position only by coupling each of the plurality of lens legs 170 with the plurality of fixing grooves 10a without directivity of the lens unit 100. Therefore, the center of the lens unit 100 and the center of the light source (LED) 1 always coincide, so that the uniformity of light can be ensured.

Referring to fig. 4, each of the incident surface and the exit surface of the lens unit according to the embodiment of the present invention has a shape capable of diffusing light irradiated from the light source 1.

The incident face 110 may include a recess 111, first and second reflective face regions 113 and 117, and a first inflection region 115. The recess 111 is formed to be drawn in on the optical axis of the light source 1, and the light source 1 may be disposed inside or below the recess 111. First reflection surface region 113 is a region formed around concave portion 111, and is formed in an overall convex curved surface shape on the opposite side of emission surface 130. The second reflection surface region 117 is located around the first reflection surface region 113, and is formed in a concave curved shape as a whole toward the exit surface 130. The first inflection region 115 is located at a connection of the first reflective region 113 and the second reflective region 117. Here, in forming the first and second reflection surface regions 113 and 117, the sectional shape may have a stepped shape. That is, the first and second reflection surface regions 113 and 117 may have a structure in which steps are formed in concentric circles with respect to the center of the lens unit 100. In this case, when light incident into the lens unit 100 from the light source 1 through the concave portion 111 is incident on the first and second reflection surface regions 113 and 117, the lens unit 100A can emit uniform light over the entire region. A region.

The exit surface 130 may include first and second exit surface regions 131 and 135 and a second inflection region 133. The first exit surface area 131 has a curved shape that is concave toward the concave portion 111. The second exit surface area 135 is located around the first exit surface area 131 and forms a convex curved surface at the opposite side of the concave portion 111. The second inflection region 133 is located at a connection portion between the first and second exit face regions 131 and 135. Here, the curvature of the first exit surface region 131 and the curvature of the second exit surface region 135 may be differently configured, and the curvature is changed in the second inflection region 133.

The lens unit 100 according to an embodiment of the present invention may further include a light control pattern 190 for adjusting the amount of emitted light. A light-controlling pattern may be formed on the second emission surface area 135. In addition, the light-controlling pattern 190 may also be formed in the first emission surface area 131 as needed to increase or decrease the amount of light. The light control pattern may have any configuration capable of controlling the amount of light. For example, the light-controlling pattern 190 may include a pattern imprinted on the emission surface 130, a pattern treated with haze, a printed film, an attached film, and the like. Here, when the light control pattern 190 is formed of a printed film or film, the printed film or film may have a light control characteristic according to thickness, printing density, or color.

The light-controlling pattern may include at least one of a light-amount increasing pattern and a light-amount decreasing pattern formed in a light-controlling emission surface area from which the light-controlling emission surface area emits a light amount lower than an average emission light amount. A surface area emitting a light amount higher than the average light emission amount.

For example, as shown in fig. 1, when the plane of the lens unit has a quadrangle, since the horizontal distance of the corner of the quadrangle from the reference optical axis is large, the amount of light emitted to the outside may be low. In this case, the light amount increasing pattern 190 may be formed on the edge of the lens unit 100. On the other hand, due to the structure of the lens unit 100, the light amount reduction pattern may be formed in a portion close to the optical axis and having a large amount of emitted light.

In the case where the light control exit face 130 is engraved with a light control pattern, it may be processed into a mold shape for manufacturing a lens unit, or the pattern may be engraved by a separate grinding process.

The above-described embodiments are intended to be illustrative only, as various modifications and equivalent other embodiments may be made by those skilled in the art to which the present invention pertains. Therefore, the true technical scope of the present invention should be determined by the technical idea of the invention described in the claims.

Claims (6)

1. A lens unit in which a plurality of light sources are mounted on a substrate arranged in row and column directions and light emitted from each of the plurality of light sources is uniformly emitted in a direction of a diffusion sheet, comprising:

an incident surface on the center of the light source, on which light emitted from the light source is incident;

an exit surface allowing the incident light to be diffused and emitted in the direction of the diffusion sheet;

integrally projected at a predetermined position on the emission surface, forming an air gap between the emission surface and the diffusion sheet, and including a support for supporting the diffusion sheet.

2. The lens unit of claim 1,

a fixing groove is formed at a predetermined position on the substrate,

further comprising a lens leg formed to protrude toward the substrate at a predetermined position on the incident surface corresponding to the fixing groove,

a lens unit, characterized in that the incidence surfaces are located on the substrate in a state of being spaced apart by a predetermined height.

3. The lens unit of claim 1,

a plurality of legs of the above-mentioned lens are provided,

a lens unit, characterized in that each of the legs is installed to be symmetrical from the center of an incident surface.

4. The lens unit according to any one of claims 1 to 3,

the incident surface includes:

the groove is formed by being pulled into the optical axis of the light source,

a convex curved first reflecting surface area is arranged at the periphery of the groove and at the other side of the emergent surface;

a second reflecting surface region located around the first reflecting surface region and having a concave curved surface shape on the emission surface side;

an inflection region located at a connecting portion between the region of the first reflection surface and the region of the second reflection surface.

5. The lens unit of claim 4,

the emission surface includes:

a first exit surface area located in the shape of a concave curved surface on the concave side;

a second exit surface region located around the region of the first exit surface and located at an opposite side of the groove to form a convex curved shape;

an inflection region located at a connecting portion between the first and second exit face regions.

6. The lens unit of claim 5,

the support body comprises a plurality of support bodies,

each of the plurality of supports is installed to be symmetrical from the center of the exit surface in at least one of a region of the second inflection point and a region of the second exit surface.

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