TWI457664B - Display apparatus and backlight module thereof - Google Patents

Description

Display device and backlight module thereof

The present invention relates to a display device, and more particularly to a display device using a non-self-luminous display panel and a backlight module thereof.

The backlight module is used in combination with a non-self-luminous display panel (such as a liquid crystal display panel) to provide a display light source for a non-self-luminous display panel. The technology relating to the backlight module has been disclosed in a number of patent documents, such as the patent documents of the Republic of China Patent Publication No. 201003216 and No. 201009451, and the US Patent Publication No. 20080291356.

1 is a schematic view of a conventional liquid crystal display device using a direct type backlight module. Referring to FIG. 1 , the liquid crystal display device 100 includes a liquid crystal display panel 110 and a backlight module 120 disposed under the liquid crystal display panel 110 . The backlight module 120 includes a light source 121, a diffusion plate 122, and a plurality of optical films 123. The light source 121 is disposed on a bottom portion 125 of a bottom cover 124, and the bottom cover 124 has a convex portion 126 that connects the edge of the bottom portion 125. The diffusion plate 122 is disposed on the convex portion 126, and the optical film 123 is disposed on the diffusion plate 122. In addition, the backlight module 120 further includes a support frame 127 having a support portion 128 extending above the edge of the optical film 123 to support the liquid crystal display panel 110. In addition, the liquid crystal display device 100 further includes a front frame 130 for connecting to the bottom cover 124.

In the liquid crystal display device 100 described above, the support frame 127 for supporting the liquid crystal display panel 110 is made of a light-shielding material, so that the entire support portion 128 cannot transmit light, and the light beam emitted from the edge of the optical film 123 cannot be utilized. liquid The portion of the crystal display panel 110 with respect to the support portion 128 cannot be used as the display region.

Since the top portion 132 of the front frame 130 covers the non-display area of the liquid crystal display panel 110, the top portion 132 needs to cover the entire support portion 128, so that the width D1 of the top portion 132 of the front frame 130 is too large (ie, the frame is too wide), and it is difficult to conform to the narrow frame. Demand.

The invention provides a backlight module to enable the liquid crystal display device to meet the requirements of a narrow bezel.

The invention provides a liquid crystal display device to meet the requirements of a narrow bezel.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a backlight module including a light source unit, a support frame, and a diffusion plate. The support frame is made of a light transmissive material and surrounds the light source unit. An inner wall of the support frame has a stepped structure, and the stepped structure includes a first step portion and a second step portion located outside the first step portion. A top surface of the first step portion is a first bearing surface, a top surface of the second step portion is a second bearing surface, and the second bearing surface is higher than the first bearing surface. The diffuser plate is disposed on the first bearing surface and located above the light source unit.

An embodiment of the present invention provides a display device including a backlight module and a display panel, wherein the display panel is disposed in the second frame of the support frame. Bearing surface.

In an embodiment of the invention, the backlight module further includes at least one optical film disposed between the diffusion plate and the display panel.

In an embodiment of the invention, the stepped structure further includes a third The stepped portion is disposed between the first stepped portion and the second stepped portion. A top surface of the third step is a third bearing surface, the third bearing surface is higher than the first bearing surface and lower than the second bearing surface, and the third bearing surface carries the optical film.

In an embodiment of the invention, the support frame is made of polycarbonate resin (polycarbonate, PC) or polymethyl methacrylate (PMMA).

In an embodiment of the invention, the backlight module further includes a reflective layer, and the support frame further includes an outer wall opposite to the inner wall, and the reflective layer is disposed on the outer wall and the second bearing surface.

In an embodiment of the invention, the backlight module further includes a bottom plate for carrying the light source unit and the support frame.

In an embodiment of the invention, the display device further includes a front frame connected to the bottom plate, wherein the front frame has a top portion extending above the second bearing surface, and the display panel is fixed to the second bearing surface and the top portion. between.

In summary, the display device and the backlight module thereof according to the embodiment of the present invention have at least one of the following advantages. The stepped structure of the support frame can support the diffusion plate and the display panel, and the support frame is transparent. The light material is made so that the light beam can be transmitted to the edge of the diffusion plate via the support frame and then transmitted to the display panel. Therefore, the backlight module using the embodiment of the present invention can effectively reduce the non-display area of the display panel, thereby enabling the liquid crystal display device to meet the requirements of the narrow bezel.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The foregoing and other technical contents, features and effects of the present invention are as follows A detailed description of one of the preferred embodiments will be apparent from the detailed description. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

2 is a schematic diagram of a display device in accordance with an embodiment of the present invention. Referring to FIG. 2 , the display device 200 of the embodiment includes a display panel 210 and a backlight module 300 . The backlight module 300 includes a light source unit 310, a support frame 320, and a diffusion plate 330. The support frame 320 is made of a light transmissive material and surrounds the light source unit 310. An inner wall 322 of the support frame 320 has a stepped structure. The stepped structure includes a first stepped portion 323 and a second stepped portion 324 located outside the first stepped portion 323. A top surface 325 of the first step portion 323 is a first bearing surface, a top surface 326 of the second step portion 324 is a second bearing surface, and the second bearing surface 326 is higher than the first bearing surface 325. The diffusion plate 330 is disposed on the first bearing surface 325 and above the light source unit 310 , and the display panel 210 is disposed on the second bearing surface 326 . That is to say, in this embodiment, the diffusion plate 330 is carried by the first bearing surface 325 of the first step portion 323, and the display panel 210 is carried by the second bearing surface 326 of the second step portion 324.

In the display device 200 described above, the display panel 210 can be a liquid crystal display panel or other transmissive display panel. The light source unit 310 includes, for example, a circuit board 312 and a plurality of point light sources 314 disposed on the circuit board 312. The number of the circuit boards 312 may be multiple, and the point light source 314 may be a light emitting diode or a laser diode. , but not limited to this. In addition, the backlight module 300 further includes a bottom plate 340 to carry the light source unit 310 and the support frame 320. The display device 200 further includes a front frame 220 connected to the bottom plate 340 to cover components such as the light source unit 310, the support frame 320, and the diffusion plate 330 of the display device 200. The front frame 220 has a top 222 extending above the second bearing surface 326 for display The panel 210 is fixed between the second bearing surface 326 and the top 222. In addition, the backlight module 300 may further include at least one optical film 350 disposed between the diffusion plate 330 and the display panel 210. In the present embodiment, the number of the optical films 350 is exemplified by a plurality of them, and the optical films 350 are disposed on the diffusion plate 330, for example. These optical films 350 include diffusers, cymbals or other sheets that homogenize the beam and increase brightness.

The material of the above-mentioned support frame 320 is, for example, polycarbonate resin, polymethyl methacrylate resin or other light transmissive material. Since the support frame 320 is made of a light transmissive material, the light beam 315 provided by the light source unit 310 can enter the support frame 320. A portion of the light beam entering the support frame 320 (eg, the light beam 316) may exit from the first bearing surface 325 of the first step portion 323 of the support frame 320 such that the diffusion plate 330 and the optical film 350 are opposite to the first bearing surface 325. The opposite portion has a beam 316 through. As such, the display area 211 of the display panel 210 can encompass an area opposite the first bearing surface 325. In other words, in the display device 200 of the present embodiment, the non-display area 212 of the display panel 210 can be effectively reduced to include only the area opposite to the second bearing surface 326, so that the width D2 of the top portion 222 of the front frame 220 can be greatly reduced. In order to make the display device 200 of the embodiment conform to the requirements of a narrow bezel.

It is worth mentioning that, in order to improve the light utilization efficiency and avoid the light leakage at the edge of the display area 211, the support frame 320 may be disposed with a reflective layer 360 on the outer wall 321 and the second bearing surface 326 of the inner wall 322. The reflective layer 360 can be a reflective sheet adhered to the support frame 320 or a reflective coating layer applied to the support frame 320. Further, in another embodiment, cold cathode fluorescent lamps (CCLFs) may be used as the light source unit, and the present invention does not limit the type of the light source unit.

3 is a schematic diagram of a display device according to another embodiment of the present invention. Referring to FIG. 3, the display device 200' of the present embodiment is in phase with the display device 200 described above. Similarly, the main difference lies in the structure of the support frame, so the main difference is explained below. In the display device 200' of the present embodiment, the inner wall 322' of the support frame 320' has a stepped structure, and the stepped structure includes a first step portion 323 and a second step portion 324, and further includes a The third step portion 327. The third step portion 327 is disposed between the first step portion 323 and the second step portion 324. A top surface 328 of the third step 327 is a third bearing surface, the third bearing surface 328 is higher than the first bearing surface 325 and lower than the second bearing surface 326, and the third bearing surface 328 is used for carrying optical Diaphragm 350. That is, the optical film 350 of the present embodiment is not disposed directly on the diffusion plate 330, but is disposed on the third bearing surface 328.

In the present embodiment, the support frame 320' is made of a light transmissive material, so that the light beam 315 provided by the light source unit 310 can enter the support frame 320'. A portion of the light beam entering the support frame 320' (eg, the light beam 317) may exit from the first bearing surface 325 of the first step portion 323 of the support frame 320' or the third bearing surface 328 of the third step portion 327, such that The portion of the diffuser plate 330 relative to the first bearing surface 325 and the portion of the optical film 350 relative to the first bearing surface 325 and the third bearing surface 328 have a beam 317 through. As such, the display area 211 of the display panel 210 can encompass an area opposite the first bearing surface 325 and the third bearing surface 328.

Similar to the display device 200 described above, in the display device 200' of the present embodiment, the non-display area 212 of the display panel 210 can be effectively reduced to an area opposite to the second bearing surface 326 of the support frame 320', so that the display area can be greatly reduced. The width D2 of the top 222 of the front frame 220 is such that the display device 200' of the present embodiment meets the requirements of a narrow bezel.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of the patent application does not All of the objects, advantages or features of the present invention are to be achieved. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. In addition, the terms "first", "second" and the like mentioned in the specification or the scope of the claims are only used to name the elements or distinguish different embodiments or ranges, and are not intended to limit the number of elements. Upper or lower limit.

100‧‧‧Liquid crystal display device

110‧‧‧LCD panel

120‧‧‧Backlight module

121‧‧‧Light source

122‧‧‧Diffuser

123‧‧‧Optical diaphragm

124‧‧‧ bottom cover

125‧‧‧ bottom

126‧‧ ‧ raised parts

127‧‧‧Support frame

128‧‧‧Support

130‧‧‧ front box

132‧‧‧ top

200, 200’‧‧‧ display devices

210‧‧‧ display panel

211‧‧‧ display area

212‧‧‧Non-display area

220‧‧‧ front box

222‧‧‧ top

300‧‧‧Backlight module

310‧‧‧Light source unit

312‧‧‧ circuit board

314‧‧‧ point light source

315, 316, 317‧‧‧ beams

320, 320’‧‧‧ support frame

321‧‧‧ outer wall

322, 322’‧‧‧ inner wall

323‧‧‧First step

324‧‧‧ second step

325‧‧‧Top surface (first bearing surface)

326‧‧‧Top surface (second bearing surface)

327‧‧‧ third step

328‧‧‧Top surface (third bearing surface)

330‧‧‧Diffuser

340‧‧‧floor

350‧‧‧Optical diaphragm

360‧‧‧reflective layer

D1, D2‧‧‧ width

1 is a schematic view of a conventional liquid crystal display device using a direct type backlight module.

2 is a schematic diagram of a display device in accordance with an embodiment of the present invention.

3 is a schematic diagram of a display device according to another embodiment of the present invention.

200‧‧‧ display device

210‧‧‧ display panel

211‧‧‧ display area

212‧‧‧Non-display area

220‧‧‧ front box

222‧‧‧ top

300‧‧‧Backlight module

310‧‧‧Light source unit

312‧‧‧ circuit board

314‧‧‧ point light source

315, 316 ‧ ‧ beam

320‧‧‧Support frame

321‧‧‧ outer wall

322‧‧‧ inner wall

323‧‧‧First step

324‧‧‧ second step

325‧‧‧Top surface (first bearing surface)

326‧‧‧Top surface (second bearing surface)

330‧‧‧Diffuser

340‧‧‧floor

350‧‧‧Optical diaphragm

360‧‧‧reflective layer

D2‧‧‧Width

Claims (7)

A display device comprising: a backlight module comprising: a light source unit; a support frame made of a light transmissive material, and surrounding the light source unit, an inner wall of the support frame has a stepped structure, the stepped shape The structure includes a first step portion and a second step portion outside the first step portion, a top surface of the first step portion is a first bearing surface, and a second step portion The top surface is a second bearing surface, and the second bearing surface is higher than the first bearing surface; a diffusing plate is disposed on the first bearing surface and located above the light source unit; and a display panel is disposed on the The second bearing surface, wherein the display panel comprises a display area and a non-display area, the display area covers an area opposite to the first bearing surface. The display device of claim 1, wherein the backlight module further comprises at least one optical film disposed between the diffusion plate and the display panel. The display device of claim 2, wherein the stepped structure further comprises a third step portion disposed between the first step portion and the second step portion, the third step A top surface of the portion is a third bearing surface, the third bearing surface is higher than the first bearing surface and lower than the second bearing surface, and the third bearing surface carries the at least one optical film. The display device of claim 1, wherein the support frame is made of a polycarbonate resin or a polymethyl methacrylate resin. The display device of claim 1, wherein the backlight module further comprises a reflective layer, the support frame further comprising an outer wall opposite to the inner wall, the reflective layer being disposed on the outer wall and the second carrier On the surface. The display device of claim 1, wherein the backlight module further comprises a bottom plate for carrying the light source unit and the support frame. The display device of claim 6, further comprising a front frame connected to the bottom plate, wherein the front frame has a top portion extending above the second bearing surface, and the display panel is fixed to the second Between the bearing surface and the top.