KR20060118191A - Back light assembly and display device having the back light assembly - Google Patents

Abstract

A backlight assembly and a display device having the same are provided to reduce the number of constituent components and improve the assembling efficiency of the backlight assembly, by constituting a reflecting member to cover a light source and a reflection surface of a light guiding plate. A light guiding plate(110) has an incident surface(111) and a reflection surface(113) connected to the incident surface. A light source(120) supplies the light to the incident surface of the light guiding plate. A reflecting member(130) surrounds the light source. The reflecting member includes a first reflector(131) for reflecting the light emitted from the light source to the incident surface and a second reflector(135) extended from the first reflector and facing the reflection surface.

Description

BACK LIGHT ASSEMBLY AND DISPLAY DEVICE HAVING THE BACK LIGHT ASSEMBLY}

1 is a perspective view of a backlight assembly according to an embodiment of the present invention.

2 is a perspective view of a backlight assembly according to another embodiment of the present invention.

3 is an exploded perspective view of the backlight assembly illustrated in FIG. 2.

4 is a partial cross-sectional view taken along the line II ′ of the backlight assembly illustrated in FIG. 3.

FIG. 5 is a partial cross-sectional view of the backlight assembly illustrated in FIG. 3 taken along the line II-II ′.

6 is an exploded perspective view of a display device according to an exemplary embodiment.

FIG. 7 is a partial cross-sectional view of the display device illustrated in FIG. 6 taken along line III-III ′.

<Explanation of symbols for the main parts of the drawings>

300: backlight assembly 310: light guide unit

320: light source 331: first reflecting unit

335: second reflecting portion 350: first receiving member

370: second storage member 400: optical module

500: display panel 600: display device

The present invention relates to a backlight assembly and a display device having the same. More particularly, the present invention relates to a backlight assembly having a reduced number of parts and a display device having improved reliability against external impact.

In general, the liquid crystal has both electrical and optical characteristics that change the transmittance of light according to the intensity of the electric field. A liquid crystal display device (LCD) displays an image by using the electro-optical characteristics of the liquid crystal (LC).

The liquid crystal display device is one of the flat panel display devices, and has advantages of lighter weight, thinner thickness, and lower power consumption than the cathode ray tube display device. However, the liquid crystal display includes a complicated light providing system for displaying an image.

Specifically, since the liquid crystal is a passive element that does not generate light by itself, the liquid crystal display includes a backlight assembly to display an image in a dark place.

Background Art A backlight assembly employed in a conventional display device is classified into a direct downward type back light assembly and an edge type back light assembly according to an arrangement of a light source.

In the direct type backlight assembly, a plurality of light sources are disposed under the display panel. In the edge type backlight assembly, a light source is disposed on a side of the light guide plate to provide light to the display panel.

The edge type backlight assembly includes a reflector reflecting light emitted from the circle to the light guide plate and a reflecting plate reflecting light leaked from the light guide plate to the light guide plate to improve light utilization efficiency. . In addition, to prevent the light guide plate from damaging the light source, the backlight assembly includes a light guide plate stopper.

Accordingly, when assembling the edge type backlight assembly, assembling time is required to align the reflector and the reflecting plate at a designated position, and the design of the light guide plate stopper is complicated, thereby degrading assembling of the backlight assembly. There is a problem.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and one object of the present invention is to provide a backlight assembly in which the lamp reflector and the reflector are integrally formed to reduce components.

Another object of the present invention is to provide a display device including the backlight assembly having improved reliability against external shock.

In order to realize the above object of the present invention, a backlight assembly according to an embodiment of the present invention includes a light guide unit, a light source, and a light reflecting member. The light guide unit includes an incident surface and a reflective surface connected to the incident surface. The light source faces the incident surface and provides light to the incident surface. The light reflecting member includes a first reflecting portion and a second reflecting portion. The first reflector surrounds the light source and reflects light emitted from the light source toward the incident surface. The second reflector extends from the first reflector to face the reflecting surface.

Optionally, the backlight assembly further comprises a first receiving member. The first accommodating member includes a bottom plate and a guide part. The light reflecting member is disposed on the bottom plate. The guide portion protrudes from the bottom plate between the light source and the incident surface to prevent the light guide unit from impacting the light source. Preferably, the first receiving member further includes a first side wall. The first sidewall extends from the bottom plate to face the incidence surface with the first reflecting portion interposed therebetween.

Preferably, the light source comprises a lamp and a lamp holder. The lamp holder is coupled to the end of the lamp to secure the lamp on the bottom plate. The guide portion protrudes between the lamp holder and the incident surface. Preferably, the second reflecting portion is formed with an opening into which the guide portion is inserted.

Optionally, said backlight assembly further comprises a second receiving member. The second accommodating member includes a top plate, a second side wall, and a stuffer. The top plate is disposed to face the bottom plate. The second side wall extends from the top plate to face the incident surface with the first reflecting portion interposed therebetween. The stuffer is formed on the top plate. The stuffer contacts the upper end of the guide part to prevent the guide part from bending toward the light source.

In order to achieve the above object of the present invention, a display device according to an embodiment of the present invention includes an optical module and a display panel. The optical module includes a light guide member, a light source and a light reflecting member. The display panel is disposed on the optical module to display an image based on light emitted from the optical module.

According to the backlight assembly and the display device, it is possible to provide a backlight assembly and a display device, in which the number of parts is reduced, so that assembly is easy and reliability of external impact is improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Backlight assembly

1 is a perspective view of a backlight assembly according to an embodiment of the present invention.

Referring to FIG. 1, the backlight assembly 100 includes a light guide unit 110, a light source 120, and a light reflecting member 130.

The light guide unit 110 changes the path of incident light and emits the light. In FIG. 1, the light guide unit 110 includes an incident surface 111 and a reflective surface 113 connected to the incident surface 111, and has a plate shape. The light guide unit 110 further includes an exit surface 115 facing the reflection surface 113. Light incident on the incident surface 111 is reflected by the reflecting surface 113 and emitted through the emitting surface 115.

The light source 120 is disposed to face the incident surface 111 to provide light to the incident surface 111.

The light reflecting member 130 reflects light and enters the incident surface 111 and the reflecting surface 113. To this end, the light reflecting member 130 includes first reflecting portions 131 and 135.

The first reflector 131 is disposed to face the incident surface 111 with the light source 120 therebetween. The first reflector 131 is bent to surround the light source 120. The first reflector 131 reflects the light emitted from the light source 120 toward the incident surface 111.

The 135 extends from the first reflecting part 131 to face the reflecting surface 113. Preferably, the 135 is in close contact with the reflective surface 113. Some of the light incident through the incident surface 111 leaks to the outside of the light guide unit 110 through the reflective surface 113. The reference numeral 135 reflects the leaked light and enters the reflective surface 113 again. Accordingly, the amount of light emitted through the exit surface 115 of the light guide unit 110 is increased.

In FIG. 1, the light reflecting member 130 is an optical sheet formed of a flexible material. Alternatively, the light reflecting member 130 may be a reflecting plate formed of a metal material. In this case, the light reflection member 130 may further include a reflection layer made of a material having excellent light reflection efficiency.

2 is a perspective view of a backlight assembly according to another embodiment of the present invention. 3 is an exploded perspective view of the backlight assembly illustrated in FIG. 2.

2 and 3, the backlight assembly 300 includes a light guide unit 310, a light source 320, and a light reflecting member 330. Since the light guide unit 310 is the same as the light guide unit 110 shown in FIG. 1, detailed description thereof will be omitted.

The light source 320 provides light to the incident surface 311 of the light guide unit 310. The light source 320 includes a lamp 321 and a lamp holder 325.

The lamp 321 includes a lamp body having a linear light shape and a discharge gas injected into an inner space of the lamp body. The lamp 321 further includes electrodes disposed at ends of the lamp body. A fluorescent layer is formed on the inner wall of the body. When a driving voltage is applied to the electrodes, the discharge gas causes a discharge. The fluorescent layer converts the invisible light generated by the discharge of the discharge gas into visible light and emits the light.

The lamp holder 325 is coupled to an end of the lamp 321 in which the electrodes are disposed. The lamp holder 325 insulates the electrode from the outside. The light reflecting member 330 is the same as the light reflecting member 330 shown in FIG. 1 except for a shape. The light reflecting member 330 includes a first reflecting portion 331 and a second reflecting portion 335.

The first reflector 331 reflects the light emitted from the light source 320 toward the incident surface 311. The first reflector 331 is disposed to face the incident surface 311 with the light source 320 interposed therebetween. In detail, the first reflector 331 is bent to surround the light source 320. A plurality of grooves 333 are formed in the first reflector 331 to facilitate bending of the first reflector 331. The grooves 333 are formed along the longitudinal direction of the lamp 321.

The second reflector 335 reflects the light leaked through the reflective surface 313 toward the reflective surface 313. The second reflector 335 extends from the first reflector 331 to face the reflecting surface 313. Preferably, the second reflector 335 is in close contact with the reflective surface 313.

In FIG. 3, the width of the second reflector 335 in the longitudinal direction of the lamp 321 is greater than the width of the first reflector 331. For this reason, the first reflecting part 331 surrounds the remaining part of the lamp 321 except for the part covered by the lamp holder 325. An opening 337 is formed in the second reflector 335 near the lamp holder 325 to fix the light reflecting member 330.

In FIG. 3, the backlight assembly 300 further includes an optical sheet 340, a first accommodating member 350, and a second accommodating member 370.

The optical sheet 340 includes a diffusion sheet 341 and light collecting sheets 345.

The diffusion sheet 341 is disposed on the exit surface 315. The diffusion sheet 341 emits light having improved luminance uniformity by diffusing the light emitted from the emission surface 315. The light collecting sheets 345 are disposed on the diffusion sheet 341. The light collecting sheets 345 collect light emitted from the diffusion sheet 341 to improve the front brightness of the backlight assembly 300.

4 is a partial cross-sectional view taken along the line II ′ of the backlight assembly illustrated in FIG. 3. FIG. 5 is a partial cross-sectional view of the backlight assembly illustrated in FIG. 3 taken along the line II-II ′.

3 to 5, the first accommodating member 350 accommodates the light guide unit 310, the light source 320, and the optical sheet 340. To this end, the first accommodating member 350 includes a bottom plate 351 and a guide portion 353.

The light reflecting member 330 is disposed on the bottom plate 351.

When the external impulse is applied to the backlight assembly 300, the guide part 353 impacts the light source 320 by the light guide unit 310, and thus the light source 320 and the light guide unit 310. ) To prevent damage.

To this end, the guide portion 353 protrudes from the bottom plate 351 between the light source 320 and the incident surface 311. In detail, in FIG. 5, the guide part 353 protrudes between the lamp holder 325 and the incident surface 311.

In this case, the guide part 353 is inserted into the opening 337 formed in the second reflecting part 335. Accordingly, the light reflection member 330 is fixed in the bottom plate 351.

Preferably, the first receiving member 350 further includes a first sidewall 355. The first sidewall 355 extends from the bottom plate 351 to face the incident surface 311 with the first reflecting portion 331 interposed therebetween. The first sidewall 355 contacts the first reflector 331 to bend the first reflector 331. Preferably, the backlight assembly 300 is further disposed between the first sidewall 355 and the first reflecting portion 331, further comprising an adhesive member for fixing the position of the first reflecting portion 331. Include.

The lamp holder 325 is disposed between the first sidewall 355 and the guide part 353. In order to alleviate the shock transmitted from the light guide unit 310 to the light source 320, the lamp holder 325 may be spaced apart from the guide part 353 by a predetermined interval. In addition, the lamp holder 325 is preferably coupled to the bottom plate 351.

The second accommodating member 370 is coupled to the first accommodating member 350 so that the light guide unit 310, the light source 320, and the optical sheet 340 are separated from the first accommodating member 350. Prevent deviations. The second accommodating member 370 includes an upper plate 371, a second sidewall 375, and a stuffer 373.

The top plate 371 is disposed to face the bottom plate 351. The upper plate 371 exposes an area where light of the optical sheet 340 is emitted. Accordingly, the top plate 371 is supported by the first sidewall 355 of the first accommodating member 350.

The second sidewall 375 extends from the top plate 371 to face the incident surface 311 with the first reflecting portion 331 interposed therebetween. In FIG. 4, the second sidewall 375 covers the first sidewall 355. The second sidewall 375 is preferably coupled to the first sidewall 355.

The stuffer 373 prevents the guide portion 353 from bending. To this end, the stuffer 373 is formed on the top plate 371. In FIG. 5, the stuffer 373 protrudes from the top plate 371 toward the bottom plate 351. The stuffer 373 supports an upper end of the guide part 353 to prevent the guide part 353 from being bent toward the light source 320 by the light guide unit 310.

Unlike in FIG. 5, the stuffer 373 is a groove formed in the upper plate 371, and the upper end portion of the guide portion 353 is fitted into the groove to prevent the guide portion 353 from being bent. Can be. Referring back to FIG. 4, an end portion of the first reflector 331 contacts the top plate 371. Accordingly, the top plate 371 bends the first reflector 331.

Display device

6 is an exploded perspective view of a display device according to an exemplary embodiment.

Referring to FIG. 6, the display device 600 includes an optical module 400 and a display panel 550.

The optical module 400 provides light to the display panel 550, which will be described later. To this end, the optical module 400 includes a light guide member 410, a light source 420 and a light reflecting member 430. Since the light guide member 410 and the light source 420 are the same as the light guide unit 310 and the light source 320 illustrated in FIGS. 3 to 5, repeated descriptions thereof will be omitted.

A portion 431 of the light guide member 410 surrounds the light source 420, and the remaining 435 is disposed on the rear surface 413 of the light guide member 410. The portion 431 of the light guide member 430 reflects the light emitted from the light source 420 toward the incident surface 411. The remainder 435 of the light guide member 430 reflects light leaking to the back 413 and enters the back 413.

Meanwhile, the optical module 400 further includes an optical sheet 440 and a first accommodating member 450. Since the optical sheet 440 and the first accommodating member 450 are the same as those of the optical sheet 340 and the first accommodating member 350 illustrated in FIGS. 3 to 5, repeated descriptions thereof will be omitted.

FIG. 7 is a partial cross-sectional view of the display device illustrated in FIG. 6 taken along line III-III ′.

6 and 7, the display device 600 further includes a second accommodating member 470.

The second accommodating member 470 is coupled to the first accommodating member 450 and supports the display panel 550, which will be described later. The second accommodating member 470 includes a top plate 471, a second side wall 475, and a stuffer 473.

The top plate 471 is disposed to face the bottom plate 451. The upper plate 471 exposes an area where light of the optical sheet 440 is emitted. In addition, the upper plate 471 is provided with a stepped portion on which the display panel 550 to be described later is disposed. The top plate 471 is supported by the first sidewall 455 of the first receiving member 450.

Since the second sidewall 475 and the stuffer 473 are the same as the second side wall 375 and the stuffer 373 illustrated in FIGS. 3 to 5, redundant description thereof will be omitted.

The display panel 550 displays an image based on the light provided from the optical module 400. The display panel 550 is disposed on the stepped portion formed on the upper plate 471. The display panel 550 includes a first substrate 510, a second substrate 530, and a liquid crystal layer (not shown).

The first substrate 510 is a transparent glass substrate in which a thin film transistor, which is a switching element, is formed in a matrix form. The pixel electrode made of a transparent conductive material is formed on the first substrate 510.

The second substrate 530 is disposed to face the first substrate 510 at a predetermined interval. The second substrate 530 is a substrate in which an RGB pixel, which is a color pixel expressed in a predetermined color when light passes, is formed by a thin film process. A common electrode made of a transparent conductive material is formed on the entire surface of the second substrate 530 facing the first substrate 510 to correspond to the pixel electrode formed on the first substrate 510.

The display panel 550 further includes a printed circuit board 520 and a connection film 521. The printed circuit board 520 generates a driving signal for driving the display panel 550. The printed circuit board 520 is electrically connected to one edge of the first substrate 510 through the connection film 521.

When an electric field is formed between the first substrate 510 and the second substrate 530 according to the driving signal applied from the printed circuit board 520, the first substrate 510 and the second substrate The arrangement of the liquid crystal layer interposed between 530 is changed. Accordingly, the transmittance of light supplied from the optical module 400 is changed, and the display device 600 displays an image having a desired gray scale.

In FIG. 6, the display device 600 further guides the display panel 550 and further includes a third accommodating member 650 coupled to the second accommodating member 470 or the first accommodating member 450. It may include. The third accommodating member 650 covers the edge of the display panel 550 to expose the effective display area of the display panel 550.

As described in detail above, according to the present invention, the light reflecting member includes the first reflecting portion and the second reflecting portion integrally formed to cover all of the reflecting surfaces of the light source and the light guide unit. Accordingly, the components of the backlight assembly are reduced, thereby improving the assemblability of the backlight assembly.

The first accommodating member may include the guide part integrally formed with the first accommodating member. The guide part is interposed between the incident surface of the light guide unit and the light source, and fixes the light reflecting member to the first accommodating member.

Accordingly, in order to prevent the light guide member from impacting the light source, it is not necessary to form a locking step at the edge of the light guide member. Accordingly, the design and manufacture of the light guide unit can be simplified, and the assemblability and productivity of the display device are improved.

Although the detailed description of the present invention has been described with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art will have the idea of the present invention described in the claims to be described below. It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (10)

A light guide unit comprising an incident surface and a reflective surface connected to the incident surface; A light source providing light to the incident surface; And A light reflecting member surrounding the light source, the light reflecting member including a first reflecting portion reflecting light emitted from the light source toward the incident surface, and a second reflecting portion extending from the first reflecting portion to face the reflecting surface; Backlight assembly comprising a. The method of claim 1, A bottom plate on which the light reflecting member is disposed; And And a first accommodating member having a guide portion protruding from the bottom plate between the light source and the incident surface to prevent the light guide unit from impacting the light source. The light source of claim 2, wherein the light source includes a lamp and a lamp holder coupled to an end of the lamp to fix the lamp on the bottom plate, And the guide part protrudes between the lamp holder and the incident surface. The backlight assembly of claim 2, wherein the second reflecting part is formed with an opening into which the guide part is inserted. The method of claim 1, wherein the first receiving member further comprises a first side wall extending from the bottom plate to face the incidence surface with the first reflecting portion therebetween, And the first reflector is fixed to the first sidewall. The method of claim 2, An upper plate facing the bottom plate; A second sidewall extending from the top plate so as to face the incident surface with the first reflecting portion therebetween; And And a second accommodating member formed on the upper plate to contact the upper end of the guide part, the second accommodating member including a stuffer to prevent the guide part from being bent toward the light source. The backlight assembly of claim 1, wherein grooves are formed in the first reflector to bend the first reflector. An optical module comprising a light guide member, a light source for providing light to the light guide member, and a light reflecting member, a portion of which surrounds the light source and a remainder disposed on a rear surface of the light guide member; And And a display panel disposed on the optical module to display an image based on light emitted from the optical module. The optical module of claim 8, wherein the optical module is A bottom plate on which the rest of the light reflection member is disposed; And And a first accommodating member including a guide part protruding from the bottom plate between the light source and the incident surface of the light guide member to prevent the light guide member from impacting the light source. The method of claim 9, An upper plate facing the bottom plate to support the display panel, the upper plate bending the portion of the light reflecting member; A second sidewall extending from the top plate so as to face the incident surface with the first reflecting portion therebetween; And And a second accommodating member formed on the upper plate to contact the upper end of the guide part, the second accommodating member including a stuffer to prevent the guide part from being bent toward the light source.

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