CN103925518B - Backlight module and liquid crystal display device - Google Patents
Backlight module and liquid crystal display device Download PDFInfo
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- CN103925518B CN103925518B CN201310689543.4A CN201310689543A CN103925518B CN 103925518 B CN103925518 B CN 103925518B CN 201310689543 A CN201310689543 A CN 201310689543A CN 103925518 B CN103925518 B CN 103925518B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 48
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000000059 patterning Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 7
- 239000002390 adhesive tape Substances 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 3
- 239000012788 optical film Substances 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
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- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention relates to the technical field of liquid crystal display devices, in particular to a backlight module and a liquid crystal display device. According to the backlight module structure and the liquid crystal display device provided by the embodiment of the invention, the backlight light source is directly formed on the back plate and is electrically connected with the connecting circuit formed on the back plate. Therefore, the backlight module structure provided by the invention does not need a double-sided adhesive tape to fix the backlight source in the backlight module, thereby effectively avoiding the reduction of the optical quality of the backlight module caused by the deformation of the double-sided adhesive tape due to the temperature change in the use or test process.
Description
Technical Field
The invention relates to the technical field of Liquid Crystal Displays (LCDs), in particular to a backlight module and Liquid Crystal Display equipment.
Background
With the development of liquid crystal display technology, liquid crystal display devices are also widely used in various electronic devices. The backlight assembly is an important part of a liquid crystal display device, and is used to provide a light source when the liquid crystal display device performs display of an image or the like.
Fig. 1 is a schematic view showing a structure of a liquid crystal display device in the related art; referring to fig. 1, a related art liquid crystal display device includes: a back plate 11, a frame 12, an optical film 13, a liquid crystal panel 14, a flexible Circuit board 15 (FPC), a double-sided tape 16, a backlight light source 17, and a light guide plate, a reflective layer, and the like not shown in fig. 1; the backlight module of the liquid crystal display device is composed of a backlight 11, a rubber frame 12, an optical film 13, a flexible circuit board 15, a backlight light source 17, a light guide plate and the like, so as to provide a light source required by the display of a liquid crystal panel 14 in the liquid crystal display device. Referring to fig. 1, the backlight source 17 is disposed on the flexible circuit board 15, and the flexible circuit board 15 is used to connect a plurality of backlight sources 17 together, and the backlight sources 17 are stably powered by the flexible circuit board 15 and an external power supply circuit. To fix the flexible circuit board 15 and the backlight source 17, the double-sided tape 16 fixes the flexible circuit board 15 provided with the backlight source 17 in a backlight module, such as a frame, an optical film, or a light guide plate.
FIG. 1a is a schematic cross-sectional view of a prior art LCD device along a backlight source; referring to fig. 1a, the backlight source 17 disposed on the flexible circuit board 15 is disposed in one groove of the adhesive frame 12, and the double-sided tape 16 fixes the flexible circuit board 15 and the backlight source 17 disposed on the flexible circuit board 15 in the backlight module by its own viscosity.
As described above, in the prior art, the backlight source 17 is disposed on the flexible circuit board 15, and the flexible circuit board 15 disposed with the backlight source 17 is fixed on the backlight module by the double-sided tape 16, which has the following disadvantages:
1. because of using the flexible circuit board to make the display device bulky among the backlight unit, be unfavorable for miniaturized liquid crystal display device.
2. When the flexible circuit board is assembled in the backlight module, the assembly process is too complex.
3. The flexible circuit board provided with the backlight source is fixed on the backlight module by using the double-sided adhesive tape, and the double-sided adhesive tape is easy to deform due to temperature change in the testing or using process, so that the optical quality of the backlight module and the display equipment is reduced.
Disclosure of Invention
In order to improve the optical quality of the backlight module and the liquid crystal display device, the embodiment of the invention provides the backlight module and the liquid crystal display device.
In a first aspect, an embodiment of the present invention provides a backlight module, including: a back plate and a backlight source; wherein,
a connecting circuit used for supplying power to the backlight light source is formed on the back plate;
the backlight light source is arranged on the back plate and is electrically connected with the connecting circuit.
In a second aspect, an embodiment of the present invention provides a liquid crystal display device, which includes a liquid crystal panel and the backlight module of the first aspect.
According to the backlight module structure and the liquid crystal display device provided by the embodiment of the invention, the backlight light source is directly formed on the back plate and is electrically connected with the connecting circuit formed on the back plate. Compared with the backlight module structure in the prior art, the backlight module structure provided by the embodiment of the invention does not need a double-sided adhesive tape to fix the backlight source in the backlight module, so that the reduction of the optical quality of the backlight module and the liquid crystal display device caused by the deformation of the double-sided adhesive tape due to the temperature change in the use or test process is effectively avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram showing a structure of a liquid crystal display device in the related art;
FIG. 1a is a schematic cross-sectional view of a prior art LCD device along a backlight source;
FIG. 2 is a schematic structural diagram of a backlight module according to a first embodiment of the invention;
FIG. 2a is a schematic diagram of a backplane according to an embodiment of the present invention;
FIG. 2b is a schematic diagram illustrating a cross-sectional structure of a backlight module along a backlight source according to an embodiment of the invention;
FIG. 3 is a schematic view of a backlight module according to a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a backlight module according to a third embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a liquid crystal display device according to a fourth embodiment of the present invention;
FIG. 5a is a schematic cross-sectional view of a liquid crystal display device along a backlight source according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a liquid crystal display device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
FIG. 2 is a schematic structural diagram of a backlight module according to a first embodiment of the invention; referring to fig. 2, the backlight module structure includes:
a back plate 21 and a backlight source 22. The back plate 21 has a connection circuit formed thereon for supplying power to the backlight light source 22. The backlight light source 22 is arranged on the back plate 21 and is electrically connected with the connecting circuit; the connection circuit is not shown in fig. 2. The connection circuit is a circuit for connecting the backlight light sources 22 arranged on the back plate 21 in series, parallel, or the like; and, in the present embodiment, a connection circuit is formed on the back plate 21 by using a photolithography technique or an etching technique, and the connection circuit provided on the back plate 21 is directly connected to an external power supply circuit of the backlight light source 22 to supply power to the backlight light source 22.
The back plate 21 is usually made of a metal plate to support other devices in the backlight module, such as a rubber frame and a light guide plate, so as to fix the other devices in the backlight module, thereby ensuring that the backlight module and the display device using the backlight module are in a stable combined state in the application process.
A backlight light source 22 for providing a light source required for the liquid crystal panel when the display device displays an image or the like; the backlight light source 22 is generally constituted by a light emitting device such as an LED or the like.
Optionally, in this embodiment, the backlight source 22 is surface-mounted on the back plate 21 or the backlight source 22 is disposed on the back plate 21 in a plug-in manner. Surface mounting employs Surface Mounted Technology (SMT).
Alternatively, in the present embodiment, the backlight source 22 is disposed at one end of the back plate 21 or at two opposite ends of the back plate 21. When the backlight light sources 22 are provided at both end portions of the back plate 21, a more sufficient and uniform light source can be provided when the liquid crystal display device performs display of an image or the like.
Optionally, in this embodiment, the backlight light source 22 is at least one backlight LED lamp.
Optionally, in this embodiment, when the backlight light source 22 is at least two backlight LED lamps, the connection circuit is used to connect the at least two backlight LED lamps in series.
FIG. 2a is a schematic view of a back plate according to an embodiment of the present invention; referring to fig. 2a, the back plate in this embodiment may have the following structure:
a metal base plate 211, an insulating layer 212 formed on the metal base plate 211, a copper layer 213 formed on the insulating layer 212; wherein the connection circuit is formed by patterning the copper layer 213. In this embodiment, the insulating layer 212 may be made of Polyimide (PI) as an insulating material.
Optionally, in this embodiment, the metal base plate 211 is an aluminum base plate or a stainless steel base plate.
FIG. 2b is a schematic diagram illustrating a cross-sectional structure of a backlight module along a backlight source according to an embodiment of the invention; referring to fig. 2b, in the present embodiment, the backlight source 22 is surface-mounted on the back plate 21, disposed in the slot of the rubber frame 26, and electrically connected to the connection circuit formed on the back plate 21 (the connection circuit is not shown).
In the backlight module structure provided by this embodiment, the backlight source is directly formed on the back plate and electrically connected to the connection circuit formed on the back plate. Compared with the backlight module structure in the prior art, the backlight module structure provided by the embodiment does not need a double-sided tape to fix the backlight source in the backlight module, so that the reduction of the optical quality of the backlight module caused by the deformation of the double-sided tape due to the temperature change in the use or test process is effectively avoided.
Furthermore, in the embodiment, the flexible circuit board is not needed to connect the connecting circuit of the backlight source with the external power supply circuit of the backlight source in the backlight module structure, so that the size of the backlight module is reduced, and the miniaturization design of the backlight module is facilitated.
The present invention is further described with reference to the first embodiment, which provides a second embodiment. FIG. 3 is a schematic view of a backlight module according to a second embodiment of the present invention; referring to fig. 3, the backlight module of the present embodiment further includes:
and a flexible circuit board 23, one end of the flexible circuit board 23 being fixed to the back plate 21 for supplying a power supply signal of the external power supply circuit to the connection circuit.
In the backlight module structure provided by this embodiment, the backlight source is directly formed on the back plate and electrically connected to the connection circuit formed on the back plate. Compared with the backlight module structure in the prior art, the backlight module structure provided by the embodiment does not need a double-sided tape to fix the backlight source in the backlight module, so that the reduction of the optical quality of the backlight module caused by the deformation of the double-sided tape due to the temperature change in the use or test process is effectively avoided.
Furthermore, in the embodiment, when the backlight module structure is connected with the connection circuit on the back plate and the external power supply circuit through the flexible circuit board, the flexible circuit board can be arranged at a plurality of positions of the back plate, so that the flexibility of the backlight module structure in assembly and design is improved; meanwhile, the flexible circuit board only plays a connecting role, and compared with the prior art that the flexible circuit board also comprises a connecting circuit, the area is smaller, and the backlight module has a smaller volume compared with the prior art.
The third embodiment is also provided to explain the present invention in combination with the explanation of the first embodiment. FIG. 4 is a schematic structural diagram of a backlight module according to a third embodiment of the present invention; referring to fig. 4, the backlight module of the present embodiment further includes:
a rubber frame 26 and a light guide plate (not shown in the figure).
The rubber frame 26 is connected with the back plate 21 by the fastener 24.
The light guide plate is disposed inside the rubber frame 26 to guide light emitted from the backlight source 22.
The backlight module structure provided by the embodiment does not need a double-sided tape to fix the backlight source in the backlight module, so that the optical quality of the backlight module is effectively prevented from being reduced due to the deformation of the double-sided tape caused by temperature change in the using or testing process. Meanwhile, in the embodiment, the back plate and the rubber frame are connected through the clamping piece, so that the overall stability of the backlight module is improved.
With reference to the foregoing embodiments, a fourth embodiment is also provided to explain a liquid crystal display device to which the backlight module is applied. FIG. 5 is a schematic structural diagram of a liquid crystal display device according to a fourth embodiment of the present invention; referring to fig. 5, the liquid crystal display device includes:
a back plate 31, a backlight source 32, a rubber frame 33, an optical module 34, a liquid crystal panel 35, etc. Wherein, the optical module 34 is composed of an upper diffusion sheet, a lower diffusion sheet, a prism sheet, etc.; the liquid crystal panel 35 is composed of an upper substrate, a lower substrate, and the like.
FIG. 5a is a schematic cross-sectional view of a liquid crystal display device along a backlight source according to a fourth embodiment of the present invention; referring to fig. 5 and 5a, in the liquid crystal display device, the backlight source 32 disposed on the back plate 31 is nested in the groove 30 formed in the rubber frame 33, the optical module 34 is disposed on the rubber frame 33, and the liquid crystal panel 35 is disposed on the optical module 34.
The liquid crystal display device provided by the embodiment does not need a double-sided tape to fix the backlight source in the backlight module, so that the optical quality of the backlight module is effectively prevented from being reduced due to the deformation of the double-sided tape caused by temperature change in the use or test process of the liquid crystal display device.
A fifth embodiment is also provided to explain the liquid crystal display device of the present invention in conjunction with the fourth embodiment. FIG. 6 is a schematic structural diagram of a fifth embodiment of a liquid crystal display device according to the present invention; referring to fig. 6, the liquid crystal display device in the present embodiment further includes, in comparison with the fourth embodiment:
a flexible circuit board 36 and a latch 37. The flexible circuit board 36 is used for connecting an external power supply circuit with a connection circuit formed on the back plate so as to supply power to the backlight light source; in this embodiment, only a small section of the flexible circuit board is needed to connect the external power supply circuit and the connection circuit. Compared with the flexible circuit board provided with the connecting circuit in the prior art, the connecting circuit in the embodiment only needs to provide a connecting function, and compared with the flexible circuit board comprising the connecting circuit in the prior art, the flexible circuit board is small in size and beneficial to the miniaturization design of the liquid crystal display device.
According to the liquid crystal display device provided by the embodiment, the optical quality is improved, and meanwhile, the flexibility of the backlight module in the assembling and designing processes is improved by connecting the external power supply circuit with the connecting circuit on the back plate through the small section of flexible circuit board; simultaneously, connect backplate and gluey frame through buckle spare, promoted liquid crystal display equipment's steadiness.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A backlight module, comprising: a back plate and a backlight source; wherein,
a connecting circuit used for supplying power to the backlight light source is formed on the back plate;
the backlight light source is arranged on the back plate and is electrically connected with the connecting circuit; the backlight light source is directly formed on the back plate.
2. The backlight module as claimed in claim 1, further comprising a flexible circuit board, wherein one end of the flexible circuit board is fixed to the back plate for providing a power supply signal of an external power supply circuit to the connection circuit.
3. The backlight module of claim 1, wherein the back plate comprises: a metal base plate, an insulating layer formed on the metal base plate, and a copper layer formed on the insulating layer; wherein the connection circuit is formed by patterning the copper layer.
4. The backlight module as claimed in claim 3, wherein the metal base plate is an aluminum base plate or a stainless steel base plate.
5. The backlight module as claimed in claim 1, wherein the backlight source surface is attached to the back plate or the backlight source is disposed on the back plate in a hole-inserting manner.
6. The backlight module of claim 1, wherein the backlight source is disposed at one end of the back plate or at two opposite ends of the back plate.
7. The backlight module of claim 1, wherein the backlight source is at least one backlight LED lamp.
8. The backlight module as claimed in claim 7, wherein when the backlight source is at least two backlight LED lamps, the connection circuit is configured to connect the at least two backlight LED lamps in series.
9. The backlight module according to any one of claims 1 to 8, further comprising a rubber frame and a light guide plate; wherein,
the rubber frame is connected with the back plate through a fastener;
the light guide plate is arranged on the inner side of the rubber frame and used for guiding light emitted by the backlight light source.
10. A liquid crystal display device comprising a liquid crystal panel and the backlight module of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310689543.4A CN103925518B (en) | 2013-12-16 | 2013-12-16 | Backlight module and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310689543.4A CN103925518B (en) | 2013-12-16 | 2013-12-16 | Backlight module and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103925518A CN103925518A (en) | 2014-07-16 |
| CN103925518B true CN103925518B (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310689543.4A Active CN103925518B (en) | 2013-12-16 | 2013-12-16 | Backlight module and liquid crystal display device |
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| CN (1) | CN103925518B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652520B (en) * | 2016-04-08 | 2019-03-08 | 深圳市华星光电技术有限公司 | A kind of ultra-thin LCD mould group and liquid crystal display |
| CN106773295A (en) * | 2016-12-21 | 2017-05-31 | 武汉华星光电技术有限公司 | A kind of backlight module |
| CN212060824U (en) * | 2020-06-23 | 2020-12-01 | 京东方科技集团股份有限公司 | Backplanes, Backlight Modules, and Display Devices |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191949A (en) * | 2006-11-30 | 2008-06-04 | 奇美电子股份有限公司 | Backlight module and liquid crystal display device |
| KR20080051236A (en) * | 2006-12-05 | 2008-06-11 | 삼성전자주식회사 | LED package and light source unit and backlight unit including the LED package |
| CN201116959Y (en) * | 2007-11-27 | 2008-09-17 | 比亚迪股份有限公司 | Backlight module and liquid crystal display device with the backlight module |
| KR101804892B1 (en) * | 2011-04-14 | 2017-12-06 | 엘지디스플레이 주식회사 | Light emitting diode assembly and liquid crystal display device having the same |
| TW201321840A (en) * | 2011-11-28 | 2013-06-01 | Au Optronics Corp | Display device |
| CN203217208U (en) * | 2013-04-03 | 2013-09-25 | 合肥宝龙达光电技术有限公司 | Liquid crystal module |
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| CN103925518A (en) | 2014-07-16 |
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