KR20160145239A - Surface light source device - Google Patents

Surface light source device Download PDF

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Publication number
KR20160145239A
KR20160145239A KR1020150081306A KR20150081306A KR20160145239A KR 20160145239 A KR20160145239 A KR 20160145239A KR 1020150081306 A KR1020150081306 A KR 1020150081306A KR 20150081306 A KR20150081306 A KR 20150081306A KR 20160145239 A KR20160145239 A KR 20160145239A
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KR
South Korea
Prior art keywords
light source
lens
cover bottom
source module
light
Prior art date
Application number
KR1020150081306A
Other languages
Korean (ko)
Other versions
KR101748745B1 (en
Inventor
오진석
Original Assignee
희성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 희성전자 주식회사 filed Critical 희성전자 주식회사
Priority to KR1020150081306A priority Critical patent/KR101748745B1/en
Publication of KR20160145239A publication Critical patent/KR20160145239A/en
Application granted granted Critical
Publication of KR101748745B1 publication Critical patent/KR101748745B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit of a display device in which an optical lens replaces a light guide plate to provide light of a surface light source to a display panel. A light source module disposed along at least one side wall of the cover bottom; A lens bar disposed in front of the light source module and diffusing and projecting light emitted from the light source module into the cover bottom internal space; A lens fixing member which is fastened to the cover bottom while pressing the lens bar to the cover bottom side wall; And an optical sheet laminated on the light source module while securing a light distribution space between the bottom surfaces of the cover bottoms.
According to the present invention having the above-described structure, productivity can be improved, manufacturing cost can be reduced by replacing the lens holder processed by extrusion molding with a lens fixing member that can be manufactured by injection molding, and product defects And the appearance of the display device can be variously shaped and differentiated.

Description

[0001] SURFACE LIGHT SOURCE DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source device, and more particularly, to a backlight unit of a display device in which an optical lens replaces a light guide plate to provide light of a surface light source to a display panel.

BACKGROUND ART [0002] Recently, display devices capable of slimming and lightening are mainly developed as image display devices. Examples of such a video display device include a liquid crystal display (LCD), an organic light emitting display (OLED), a plasma display panel (PDP), a field effect display FED).

Herein, a liquid crystal display (hereinafter, referred to as 'LCD') is an apparatus for displaying an image using a change in arrangement of liquid crystal molecules and light transmission according to electrical signals provided. Since the liquid crystal panel is not a self-luminous device, a backlight unit for providing light to the liquid crystal panel is essentially provided in the LCD. The backlight unit is a surface light source device that converts light from a point light source using a light emitting diode into a planar light source and provides the light to a liquid crystal panel. Generally, a light guide plate is used to convert light from a point light source into a planar light source.

On the other hand, the LCD is disadvantageous in that it is light in weight due to the provision of the backlight unit including the light guide plate. In addition, in order to provide a uniform planar light source, the LCD needs to have a light pattern of various functions for the light guide plate, which complicates the design of the light guide plate and increases the manufacturing cost due to the use of the expensive light guide plate.

Thus, the light guide plate occupies a large part in the overall structure of the LCD in terms of weight and manufacturing cost. In order to solve this problem, a display device including a surface light source device in which a light guide plate is removed is disclosed in Korean Patent No. 10-1282265 (prior art document).

FIG. 1 is an exploded perspective view showing a main configuration of a surface light source device according to a conventional technique, and FIG. 2 is a side sectional view showing a lens fastening process of the surface light source device of FIG.

As shown in these drawings, the conventional surface light source device disclosed in the prior art document includes a bar-shaped lens 10 having a predetermined length, a holder 20 for supporting the lens, And a light emitting element 30 fastened to the holder. The first extended portion 11 and the second extended portion 12 are formed in the lens 10 so that the lens 10 can be supported by the holder 20 and the light emitting element 30 The first supporting portion 21 and the second supporting portion 22 corresponding to the first extending portion 11 and the second extending portion 12 are shaped and processed together with the light emitting element accommodating portion 23 in which the light emitting element accommodating portion 23 is accommodated. By adopting the lens 10, such a surface light source device does not include a light guide plate, which is advantageous in reducing weight and manufacturing cost.

However, in the conventional surface light source device, a separate holder 20 for fixing the lens 10 must be provided. In order to fasten the holder 20 and the lens 10, the support members 21 and 22, There is a processing difficulty in which the shapes of the extending portions 11 and 12 must be matched with each other. In addition, since the first and second support portions 21 and 22 having a hook shape are formed along the longitudinal direction of the holder 20, the productivity of the holder 20 due to the production of extrusion is reduced . In addition, since the first support portion 21 and the second support portion 22 formed in the holder 20 are formed to have a small thickness, they are easily broken in the lens fastening process due to their low rigidity, .

The surface light source device has to be formed with the first extended portion 11 and the second extended portion 12 of a thin thickness along the longitudinal direction in the lens 10 so that the productivity of the lens 10 And a product failure problem due to breakage of the extended portions 11 and 12 during the fastening process.

Domestic Registration No. 10-1282265 (Registration Notice) Korean Patent Publication No. 10-2011-0087579 (filed on August 3, 2011)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a planar light source device capable of replacing an expensive lens holder formed by extrusion processing and reducing manufacturing cost while improving productivity .

It is another object of the present invention to provide a surface light source device capable of simplifying an assembling structure and minimizing product defects during a fastening process by fixing a bar-shaped lens using a lens fixing member.

According to an aspect of the present invention, there is provided an electronic apparatus comprising: a cover bottom for forming a storage space therein; A light source module disposed along at least one side wall of the cover bottom; A lens bar disposed in front of the light source module and diffusing and projecting light emitted from the light source module into the cover bottom internal space; A lens fixing member which is fastened to the cover bottom while pressing the lens bar to the cover bottom side wall; And an optical sheet laminated on the light source module while securing a light distribution space between the bottom surfaces of the cover bottoms.

Here, the lens holding member of the present invention includes: a pressing portion for pressing the lens bar; And a first fastening part bent and extended from one side of the pressing part and having an end fastened to the side wall of the cover bottom or bent at the other side of the pressing part, And a second fastening part which is fastened to the bottom surface or the side wall of the cover bottom. The reinforcing rib may be formed on the outer surface or the inner bent part.

Further, the lens holding member of the present invention is characterized by being fastened to the cover bottom at a position including both ends of the lens bar.

In addition, the cover bottom of the present invention is characterized in that the bottom portion of the cover bottom is upwardly inclined or stepped away from the light source module as the width of the space portion becomes narrower.

According to the present invention having the above-described constitution, by replacing the lens holder processed by extrusion molding with a lens fixing member which can be manufactured by injection molding, the productivity is improved and the manufacturing cost is reduced.

Further, in the present invention, by fixing the lens using several lens fixing members, the assembling structure is simplified, and product defects are not caused by breakage in the fastening process.

Further, since the light guide plate is not disposed in the accommodating space of the cover bottom, the cover bottom surface of the light receiving portion is formed in an inclined structure, a stepped structure, or the like so that the appearance of the surface light source device or the display device can be variously shaped can do.

1 is an exploded perspective view showing a main configuration of a conventional surface light source device,
FIG. 2 is a cross-sectional view showing a lens fastening process of the surface light source device of FIG. 1,
3 is an exploded perspective view showing a display device according to an embodiment of the present invention,
FIG. 4 is an assembled cross-sectional view showing a light source structure of the display device of FIG. 3,
FIG. 5 is a side cross-sectional view showing various modifications of the bottom portion of the main portion of FIG. 3,
FIG. 6 is an exploded perspective view illustrating an assembling structure of a main configuration of the surface light source device according to an embodiment of the present invention,
FIG. 7 is an assembled cross-sectional view showing the surface light source device of FIG. 6,
8 is an exploded perspective view showing an assembling structure of a main configuration of the surface light source device according to another embodiment of the present invention, and FIG.
9 is an assembled cross-sectional view showing the surface light source device of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention, FIG. 4 is an assembled cross-sectional view illustrating a light source structure of the display device of FIG. 3, and FIG. Fig.

3 and 4, the display device of the present invention includes a cover bottom 110 forming a storage space therein, a light source module 120 fastened to one side wall of the cover bottom 110, A lens fixing member 140 for fixing the lens bar 130 to the side wall of the cover bottom, a lens fixing member 140 for fixing the lens bar 130 to the cover bottom floor 110 between the light source module 120 and the cover bottom 110, A reflective sheet 150 disposed on the surface of the light source module 120, an optical sheet 160 stacked on the light source module 120, and a guide panel 170 fastened along the edge of the cover bottom, A display panel 200 stacked on top of the optical sheet, a case top 300 fastened to the front surface of the display panel and a backside of the cover bottom, and a back cover 400.

Here, the cover bottom 110 is configured such that the respective components of the surface light source device are accommodated, and a vertical side wall 110b, at least one side of which is formed by folding a bottom surface 110a of a rectangular plate, is formed. The cover bottom 110 forms a back housing of the surface light source device.

The light source module 120 constitutes an array in which a plurality of light emitting devices 122 are mounted at regular intervals on a substrate 121 as a light emitting source of the surface light source device. The substrate 121 may be a flexible printed circuit board (FPCB) having a predetermined circuit printed thereon and the light emitting element 122 may be a light emitting diode (LED) Lt; / RTI > The light source module 120 is in the form of an LED bar having a predetermined length and can be fastened to the cover bottom side wall 110b by means of a double-sided tape or a screw.

The lens bar 130 is disposed in front of the light source module 120 to uniformly distribute the light of the plurality of point light sources emitted from the light source module 120 to the cover bottom internal space A. The lens bar 130 may be made of a transparent resin having excellent light transmittance and may be manufactured by injection molding using a resin such as PMMA, PC, PS, or MS which has high strength and is not easily deformed or broken. The lens bar 130 is disposed so as to cover the front surface of the light source module 120 while having a bar shape having a predetermined length. In addition, the lens bar 130 may have various shapes such as a light incident surface on which light is incident and a light exit surface on which light is emitted for efficient light dispersion, and a light pattern may be formed on the light entrance surface and the light exit surface. The lens bar 130 is fixed to the cover bottom side wall 110b by a lens fixing member 140 to be described later.

The lens fixing member 140 has a structure for fixing the lens bar 130 and is fixed to the cover bottom 110 while pressing the lens bar 130 toward the light source module 120 to fix the lens bar 130. The lens fixing member 140 may be made of a resin material, and is preferably made of a light transmitting resin material so that the lens fixing member 140 can not be visually recognized from the outside. The specific configuration of the lens fixing member 140 and the lens bar fixing structure accordingly will be described later.

The reflective sheet 150 is a structure for improving the luminance by reflecting the light distributed in the space A of the cover bottom between the cover bottom 110 and the light source module 120 upward. The reflective sheet 150 can be attached to the cover bottom floor surface 110a with excellent light reflectivity and when the ink having a high light reflectance is coated on the cover bottom floor surface 110a, It may not be provided.

The optical sheet 160 may be composed of a plurality of sheets including a diffusion plate and upper and lower prism sheets in order to improve optical characteristics such as brightness and uniformity of light emitted upward from the cover bottom space portion A have. The optical sheet 160 is stacked on the light source module 120 while securing a predetermined space with the bottom surface of the cover bottom 110 or the reflective sheet 150.

The guide panel 170 fixes the optical sheet 160 to the cover bottom 110 and presses and fixes the end of the optical sheet 160 while being fastened along the edge of the cover bottom 110. The guide panel 170 forms a front housing of the surface light source device.

The surface light source device 100 configured as described above diffuses and scatters light of a plurality of point light sources emitted from the light source module while passing through the lens bar to form a space A between the cover bottom 110 and the optical sheet 160, And light uniformly distributed in the space A is emitted to the surface light source while passing through the upper optical sheet 160 to illuminate the display panel 200. [

The display panel 200 has a structure in which an image is displayed by using a light source provided in a surface light source device stacked on an optical sheet, and may be constituted by a liquid crystal panel.

The case top 300 is coupled along the front edge of the surface light source device to constitute a front housing of the display device while supporting and protecting the display panel 200, So as to form a rear housing of the display device. Here, the case top 300 may be combined with the guide panel 170 of the surface light source device to form a single structure, and the back cover 400 may be combined with the cover bottom 110 of the surface light source device, Can be achieved. That is, the guide panel can replace the case top for slimming down the display device, and the cover bottom can replace the back cover.

5, when the cover bottom 110, the reflective sheet 150, and the back cover 400 that constitute the bottom portion of the back surface of the display device of the present invention are moved away from the light source module 120, It is preferable that the width of the portion A is made to be an upward inclination or a step. The upward inclination can be a flat plane or a concave curved surface. The inclined or stepped structure narrows the vertical width of the space A as the distance from the light source increases, so that the light of uniform density can be distributed as a whole. At this time, only the reflective sheet 150 may be inclined or stepped as shown in (a), but it is preferable that both of the cover bottom 110 and the back cover 400 be inclined or stepped as shown in (b) In this case, there is an advantage that the back surface structure of the display device can be made beautiful.

FIGS. 6 and 7 are an exploded perspective view and an assembled cross-sectional view illustrating an assembling structure of a main configuration of the surface light source device according to an embodiment of the present invention. FIGS. 8 and 9 are cross- Fig. 3 is an exploded perspective view and an assembled cross-sectional view showing an assembled structure of the main structure of Fig.

6 and 7, the surface light source device according to an embodiment of the present invention includes a cover bottom 110, a light source module 120 coupled to a side wall of the cover bottom, a lens bar (130) and a lens fixing member (140). In particular, the lens fixing member 140 is configured to fix the lens bar 130 while being fastened to the cover bottom by a hook fastening.

The lens fixing member 140 for this purpose is formed of a frame having a pressing part 141 for pressing the lens bar 130 and a first coupling part 142 fastened to the cover bottom 110. That is, one end of the pressing portion 141 having a predetermined length is vertically bent to form the first fastening portion 142, and the end of the first fastening portion 142 is fastened to the cover bottom 110 A hook 143 is formed. For this purpose, the cover bottom 110 is formed with a hook insertion hole 111 through which the fastening hook 143 is inserted and fixed to the side wall 110b. A locking protrusion (not shown) for supporting the bottom surface 110a of the cover bottom 110 may be formed at the other end of the pressing portion 141. [

The lens fixing member 140 may have reinforcing ribs 146 and 147 formed on the inner side of the lens barrel 140, respectively. That is, as shown in the figure, the lens fixing member 140 is formed with an external reinforcing rib 146 along the outer surface of the pressing portion 141 and the first fastening portion 142, An inner reinforcing rib 147 is formed in the inner bent portion of the portion 142. The reinforcing ribs 146 and 147 prevent bending of the pressing portion 141 when the lens fixing member 140 presses the lens bar 130 so that the lens bar 130 can be stably fixed.

The lens fixing member 140 is fastened to the side wall 110b of the cover bottom 110 by the fastening hook 143 and at the same time the pressing portion 141 presses the lens bar 130 toward the light source module 120, . The lens fixing member 140 can sufficiently fix the lens bar 130 even if the lens fixing member 140 is fastened to the cover bottom 110 only in two regions including both ends or the central portion of the lens bar 130, And an appropriate number of lens fixing members 140 may be applied according to the length of the lens bar 130. [

8 and 9, the surface light source device according to another embodiment of the present invention differs from the lens fixing member in construction. As shown in the figure, the lens fixing member 140 is formed of a frame having a shape of 'C' in which the second fastening part 144 is formed on the opposite side of the first fastening part 142. That is, the lens fixing member 140 forms the first coupling part 142 while one end of the pressing part 141 is vertically bent, and the other end of the pressing part 141 is bent perpendicularly to the second coupling part 144 ). A fastening protrusion 145 for fastening the cover bottom bottom surface 110a is formed at an end of the second fastening portion 144 and a fastening protrusion 145 for fastening the fastening protrusion 145 to the bottom surface 110a of the cover bottom The projection insertion hole 112 is formed. The lens fixing member 140 is fastened to the side wall 110b and the bottom surface 110a of the cover bottom 110 so that the lens bar 130 is more stable . Here, the fastening protrusion 145 may be fastened to the side wall 110b of the cover bottom. In this case, the fastener insertion hole 112 is also formed in the side wall 110b of the cover bottom.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: plane light source device 110: cover bottom
110a: bottom surface 110b: side wall
111: hook insertion hole 112: projection insertion hole
120: light source module 130: lens bar
140: lens fixing member 141:
142: first fastening part 143: fastening hook
144: second fastening part 145: fastening projection
150: reflective sheet 160: optical sheet
170: Guide panel
200: Display panel
300: Case Top
400: back cover

Claims (6)

A cover bottom defining a storage space therein;
A light source module disposed along at least one side wall of the cover bottom;
A lens bar disposed in front of the light source module and diffusing and projecting light emitted from the light source module into the cover bottom internal space;
A lens fixing member which is fastened to the cover bottom while pressing the lens bar to the cover bottom side wall; And
And an optical sheet laminated on the light source module while securing a light distribution space between the bottom surfaces of the cover bottoms. 2. The lens barrel according to claim 1,
A pressing portion for pressing the lens bar; And
And a first fastening part bent and extending from one side of the pressing part and having an end fastened to the side wall of the cover bottom. 3. The lens barrel according to claim 2,
And a second fastening part bent and extending from the other side of the pressing part and having a fastening protrusion and fastened to a bottom surface or a side wall of the cover bottom. The lens barrel according to claim 2 or 3,
Wherein a reinforcing rib is formed on an outer surface of the pressing portion, the first fastening portion, or a pressing portion and an inner bent portion of the first fastening portion. The lens fixing device according to any one of claims 1 to 3,
And is fastened to the cover bottom at a position including both ends of the lens bar. 4. The apparatus according to any one of claims 1 to 3,
And the upward and downward inclination or step of the space is narrowed as the floor surface is further away from the light source module.
KR1020150081306A 2015-06-09 2015-06-09 Surface light source device KR101748745B1 (en)

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KR1020150081306A KR101748745B1 (en) 2015-06-09 2015-06-09 Surface light source device

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Application Number Priority Date Filing Date Title
KR1020150081306A KR101748745B1 (en) 2015-06-09 2015-06-09 Surface light source device

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KR20160145239A true KR20160145239A (en) 2016-12-20
KR101748745B1 KR101748745B1 (en) 2017-06-20

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110087579A (en) 2010-01-26 2011-08-03 삼성엘이디 주식회사 Led light module and backlight unit having led module
KR101282265B1 (en) 2011-09-20 2013-07-10 삼성전자주식회사 Display apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001056448A (en) * 1999-08-20 2001-02-27 Ricoh Co Ltd Fixing structure for image formation element array

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110087579A (en) 2010-01-26 2011-08-03 삼성엘이디 주식회사 Led light module and backlight unit having led module
KR101282265B1 (en) 2011-09-20 2013-07-10 삼성전자주식회사 Display apparatus

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