CN110107829B - Light bar structure and backlight module - Google Patents
Light bar structure and backlight module Download PDFInfo
- Publication number
- CN110107829B CN110107829B CN201910458706.5A CN201910458706A CN110107829B CN 110107829 B CN110107829 B CN 110107829B CN 201910458706 A CN201910458706 A CN 201910458706A CN 110107829 B CN110107829 B CN 110107829B
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- China
- Prior art keywords
- light
- bar structure
- flexible substrate
- light bar
- emitting element
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- 239000000758 substrate Substances 0.000 claims abstract description 35
- 239000000853 adhesive Substances 0.000 claims abstract description 21
- 230000001070 adhesive effect Effects 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
- F21S4/22—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape
-
- 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
- F21V19/00—Fastening of light sources or lamp holders
-
- 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
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
- F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a light bar structure, which comprises a flexible substrate, at least one light-emitting element and a back adhesive. The flexible substrate comprises two pairs of cutting lines which penetrate through the front surface and the back surface of the flexible substrate; the light-emitting element is arranged on the front surface of the flexible substrate and positioned between the two secants, and the area formed by the mutual projection of the two ends of each secant is larger than the area of the projection of the light-emitting element on the flexible substrate; the back glue is arranged on the back of the flexible substrate and is provided with a hollowed area, the area of the hollowed area is larger than the area formed by the mutual projection of the two ends of the two cutting lines, and the positions of the cutting lines are located in the hollowed area.
Description
Technical Field
The present invention relates to a light bar structure, and more particularly, to a light bar structure capable of preventing a light emitting device from being impacted, and a backlight module having the light bar structure.
Background
With the development of technology, the use of display devices is quite popular. In a side-in type backlight module, an electrical substrate used as a light source may be a rigid circuit board or a flexible circuit board, which has advantages of low cost, flexibility, light and thin structure, and is popular in the industry in recent years.
Conventionally, the flexible circuit board can be fixed on the side wall of the back cover through an adhesive tape, and a certain distance is kept between the flexible circuit board and the light guide plate by utilizing a positioning technology, so that stable optical performance and taste are exerted.
However, in long-term use, the light guide plate may expand due to environmental temperature change or moisture absorption, and when the distance reservation is insufficient, the light guide plate may impact and press the light emitting elements on the flexible circuit board, so that the light emitting elements are damaged, thereby affecting the optical performance.
Disclosure of Invention
The invention provides a light bar structure, which comprises a flexible substrate, at least one light-emitting element and a back adhesive. The flexible substrate comprises two pairs of cutting lines which penetrate through the front surface and the back surface of the flexible substrate; the light-emitting element is arranged on the front surface of the flexible substrate and positioned between the two secants, and the area formed by the mutual projection of the two ends of each secant is larger than the area of the projection of the light-emitting element on the flexible substrate; the back glue is arranged on the back of the flexible substrate and is provided with a hollowed area, the area of the hollowed area is larger than the area formed by the mutual projection of the two ends of the two cutting lines, and the positions of the two cutting lines are located in the hollowed area.
In an embodiment of the above backlight module, the light bar structure includes a plurality of light emitting elements arranged along a transverse direction at intervals; the flexible substrate comprises a plurality of pairs of cutting lines which are arranged at intervals along the transverse direction, wherein the plurality of pairs of cutting lines are positioned in the hollow area, and each light-emitting element is respectively positioned between one pair of cutting lines.
In one embodiment, the cut line extends in a transverse direction.
In one embodiment, the cut line extends in a longitudinal direction different from the transverse direction.
In an embodiment of the light bar structure, the light bar structure includes a plurality of light emitting elements, and the flexible substrate includes a plurality of pairs of cut lines and a plurality of hollow areas, the pairs of cut lines are respectively located in one of the hollow areas, and each of the light emitting elements is respectively located between one of the pairs of cut lines.
In the above-mentioned light bar structure, in one embodiment, the following equation is satisfied: x is more than or equal to 2T + L, wherein X is the extension length of the cutting line, T is the thickness of the back glue, and L is the extension length of each light-emitting element.
The invention further provides a backlight module in an embodiment, which includes the light bar structure and the light guide plate. The light guide plate is located one side of the light bar structure, and the light guide plate comprises a light incident surface facing at least one light emitting element.
In an embodiment of the above backlight module, the backlight module further includes a reflective plate disposed on a bottom surface of the light guide plate.
In an embodiment of the above backlight module, the backlight module further includes a back cover, the light bar structure, the light guide plate and the reflective plate are disposed in the back cover, the back cover includes an inner wall surface, and the back adhesive is attached to the inner wall surface.
The light bar structure and the backlight module provided by one embodiment and a plurality of embodiments of the invention can enable the optical performance of the applied display device to play the original optical quality even after long-term use, and can effectively reduce the risk of the light-emitting element being damaged due to the impact of the light guide plate, thereby effectively solving the problems encountered in the prior art.
Drawings
FIG. 1 is a front view of a first embodiment of a light bar construction of the present invention;
FIG. 2 is a schematic view illustrating a usage status of a backlight module according to an embodiment of the present invention;
FIG. 3 is a schematic view illustrating another usage state of the backlight module according to an embodiment of the present invention;
FIG. 4 is a front view of a second embodiment of a light bar construction of the present invention;
FIG. 5 is a front view of a third embodiment of a light bar construction of the present invention;
FIG. 6 is a schematic view of a cut line of the light bar structure according to an embodiment of the present invention;
FIG. 7 is a schematic view of a cut line according to an embodiment of the light bar structure of the present invention;
fig. 8 is a schematic view of an embodiment of a cut line of the light bar structure of the present invention.
Description of the symbols:
100: a backlight module;
1: a light bar structure;
11: a flexible substrate;
11 a: a front side;
11 b: a back side;
111: cutting a line;
12: a light emitting element;
13: carrying out gum application;
2: a light guide plate;
3: a reflective plate;
4: a back cover;
41: an inner wall surface;
a1: a projected area;
a2: a hollowed-out area;
d: transverse direction;
l: an extended length;
t: thickness;
x: and (4) extending the length.
Detailed Description
In order to make the aforementioned features and effects of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 to 3, fig. 1 is a front view of a first embodiment of a light bar structure of the present invention. FIG. 2 is a schematic view illustrating a usage status of a backlight module according to an embodiment of the invention. FIG. 3 is a schematic view of another use state of the backlight module according to an embodiment of the invention. The light bar structure 1 includes a flexible substrate 11, at least one light emitting element 12, and a back adhesive 13. The flexible substrate 11, such as a flexible circuit board, is used for the light emitting device 12 to be mounted thereon and providing the necessary printed circuit to provide power to the light emitting device 12. The Light emitting element 12 may be, but not limited to, a Light-emitting diode (LED) for projecting Light. The back adhesive 13 may be a double-sided adhesive, one side of which is adhered to the flexible substrate 11, and the other side of which is adhered to the fixing structure (e.g. the back cover 4 in fig. 2 and 3) to fix the flexible substrate 11 to the fixing structure.
As shown in fig. 1, 2 and 3, the flexible substrate 11 includes two pairs of cut lines 111, and the cut lines 111 penetrate through the front surface 11a and the back surface 11b of the flexible substrate 11. The light emitting element 12 is disposed on the front surface 11a of the flexible substrate 11 between the two cut lines 111. As shown in fig. 1, an area a1 formed by projecting both ends of each dividing line 111 onto each other is larger than an area of the light-emitting element 12 projected onto the flexible substrate 11.
As shown in fig. 1, 2 and 3, the back adhesive 13 is disposed on the back surface 11b of the flexible substrate 11 in an adhesive manner. The back adhesive 13 has a hollowed-out area a2, i.e., a hollowed-out area, the area of the hollowed-out area a2 is larger than the area a1 formed by the mutual projection of the two ends of the two secants 111, and the two secants 111 are located in the hollowed-out area a 2. With this structure, when the flexible substrate 11 is adhered to the fixed structure (e.g. the back cover 4 in fig. 2 and 3) by the back adhesive 13, a part of the flexible substrate 11 between the two secants 111 is in a floating state and keeps a gap with the fixed structure; the gap corresponds to the thickness T of the backing adhesive 13. Therefore, the movement of the light emitting element 12 has a buffer property and can be displaced toward the fixed structure, and when the light guide plate 2 may be pressed toward the light emitting element 12 due to thermal expansion, the light emitting element 12 can be moved toward the fixed structure (e.g., the back cover 4 in fig. 2 and 3) due to compression, so as to reduce and buffer the forward pressure, thereby preventing the light emitting element 12 from being damaged due to compression and affecting the optical quality of the light bar structure 1.
Referring to fig. 2 and fig. 3, based on the light bar structure 1, the present invention further provides a backlight module 100. The backlight module 100 includes a light bar structure 1, a light guide plate 2, a reflective plate 3 and a back cover 4. The light bar structure 1 may be the light bar structure 1 according to any embodiment of the present disclosure. The light bar structure 1, the light guide plate 2 and the reflection plate 3 are disposed in the back cover 4, the back cover 4 includes an inner wall surface 41, and the back adhesive 13 is attached to the inner wall surface 41. The light guide plate 2 is located on one side of the light bar structure 1, and the light guide plate 2 includes a light incident surface facing the light emitting element 12. The reflective plate 3 is located on the bottom surface of the light guide plate 2.
Fig. 2 shows the backlight module 100 in an unused state, in which a certain gap is left between the light emitting element 12 and the light guide plate 2, and a gap (approximately the thickness T of the back adhesive 13) is also left between the light emitting element 12 and the inner wall surface 41.
As shown in fig. 3, when the backlight module 100 is used for a period of time, the light guide plate 2 expands when exposed to a thermal environment or expands due to moisture absorption, and the lateral expansion is developed to impact and press the light emitting elements 12. Because of the gap, the light emitting element 12 moves toward the hollowed-out area a2 after being pressed by the light guide plate 2, and is not directly clamped and pressed between the light guide plate 2 and the inner wall surface 41, so that the pressed force is effectively reduced and buffered, the damage is avoided, and the light emitting element 12 can still exert optical performance with a certain efficiency.
Fig. 4 is a front view of a light bar structure according to a second embodiment of the present invention. In this embodiment, the difference from the first embodiment shown in fig. 1 is the shape of the hollowed-out area a 2. The hollowed-out area a2 of the first embodiment shown in fig. 1 is a block-shaped, e.g., rectangular, and is only partially hollowed out of the back adhesive 13 and may include the cut line 111. The hollowed-out area a2 shown in fig. 2 is a strip-shaped hollow, and the middle section of the back adhesive 13 is entirely removed, so that the purpose of protecting the light-emitting element 12 can be achieved by this structural design.
Fig. 5 is a front view of a third embodiment of the light bar structure of the present invention. The difference between the embodiment shown in fig. 1 and fig. 4 is that the back adhesive 13 has a plurality of hollow areas a2, and adjacent hollow areas a2 are disposed at intervals. The two pairs of the secant lines 111 are a secant line group, each secant line group is respectively located in each hollowed-out area a2, and each light emitting element 12 is located between each pair of the secant lines 111. The hollow areas a2 and the light emitting elements 12 are disposed at intervals along a transverse direction D, and the paired secants 111 are disposed at intervals along the transverse direction D. With this structure, the above-mentioned purpose of avoiding the light guide plate 2 from damaging the light emitting device 12 due to the impact can be achieved.
Due to the flat cable design of the display device or the light emitting device to which the light bar structure 1 is applied, a worker may cut the cut line 111 in the transverse direction D, and the cut line 111 extends in the transverse direction D in the embodiment shown in fig. 1 to 3. However, the present invention is not limited thereto, and in some embodiments, the cutting line 111 may be cut in a direction different from the transverse direction D, for example, in a longitudinal direction (not shown), depending on the arrangement of the flat cable.
In addition, as shown in fig. 5, in order to protect the light emitting device 12, the light guide plate 2 is prevented from being damaged by thermal expansion or other factors that may impact the light emitting device 12. In these embodiments, the extension length of the scribe line 111, the thickness of the back adhesive 13, and the extension length of the light emitting device 12 satisfy the following equation: x is greater than or equal to 2T + L, wherein X is the extending length of the cut line 111, T is the thickness of the back adhesive 13 (see FIG. 7 or FIG. 8), L is the extending length of each light emitting element 12, and the extending direction of the cut line 111 and the extending direction of the light emitting elements 12 are the same direction.
In addition, regarding the type of the cut line 111, the present invention is not limited to the line , please refer to fig. 6 to 8, which are schematic views of an embodiment of the cut line 111 of the light bar structure 1 according to the present invention. As shown in fig. 6, the secant 111 is an opposing arc; as shown in fig. 7, the cut line 111 may be a wavy line; as shown in fig. 8, the two ends of the cut line 111 have a bent portion, in the embodiment shown in fig. 8, the bent portion extends towards the outside, and in some embodiments, the bent portion extends towards the inside. That is, the present invention is not limited to the type of the cut line 111 shown in the above-mentioned figures, and different types of the cut lines 111 can be adopted according to the needs and designs of the end-user.
Through the light bar structure provided by one or more embodiments of the invention, the applied display device is not damaged by the light guide plate or other optical films expanding and impacting the light-emitting element under long-term use, and the optical performance is not damaged. In other words, in one or more embodiments, the light bar structure can effectively reduce the risk that the light emitting elements are damaged due to the impact of the light guide plate. In addition, the backlight module of an embodiment of the invention has the light bar structure and also has the advantages.
Although the present invention has been described in terms of the above embodiments, the embodiments are merely illustrative, and not restrictive, and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.
Claims (8)
1. A light bar structure, comprising:
the flexible substrate comprises two pairs of cutting lines which penetrate through the front surface and the back surface of the flexible substrate;
the area formed by the mutual projection of the two ends of the secant is larger than the area of the projection of the at least one light-emitting element on the flexible substrate; and
a back adhesive, one side of which is arranged on the back surface of the flexible substrate and the other side of which is adhered to the fixed structure so as to fix the flexible substrate on the fixed structure; the back glue is provided with a hollowed-out area, the area of the hollowed-out area is larger than the area formed by the mutual projection of the two ends of the cutting line, and the position of the cutting line is positioned in the hollowed-out area;
wherein the extension direction of the secant is the same as that of the light-emitting element, and the part of the flexible substrate between the two secants in pairs is in a floating state and keeps a gap with the fixed structure;
the extension length of the secant and the light-emitting element satisfies: x is more than or equal to 2T + L, wherein X is the extension length of the cutting line, T is the thickness of the back adhesive, and L is the extension length of each light-emitting element.
2. The light bar structure of claim 1, wherein the light bar structure comprises a plurality of light emitting elements arranged laterally and at intervals; the flexible substrate comprises a plurality of pairs of secant lines which are arranged at intervals along the transverse direction, wherein the plurality of pairs of secant lines are positioned in the hollow-out area, and each light-emitting element is respectively positioned between one pair of secant lines.
3. The light bar structure of claim 2, wherein the cut line extends along the transverse direction.
4. The light bar structure of claim 2, wherein the cut line extends longitudinally in a direction different from the transverse direction.
5. The light bar structure of claim 1, wherein the light bar structure comprises a plurality of light emitting elements, and the flexible substrate comprises a plurality of pairs of cut lines and a plurality of hollowed-out regions, the pairs of cut lines are respectively located in one of the hollowed-out regions, and each light emitting element is respectively located between one of the cut lines.
6. A backlight module, comprising:
the light bar structure of any one of claims 1 to 5; and
the light guide plate is positioned on one side of the light bar structure and comprises a light incident surface, and the light incident surface faces the at least one light emitting element.
7. The backlight module of claim 6, further comprising a reflective plate on a bottom surface of the light guide plate.
8. The backlight module of claim 7, further comprising a back cover, wherein the light bar structure, the light guide plate and the reflective plate are disposed in the back cover, the back cover comprises an inner wall surface, and the back adhesive is attached to the inner wall surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107142812A TWI675606B (en) | 2018-11-29 | 2018-11-29 | Light bar structure and backlight module |
| TW107142812 | 2018-11-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110107829A CN110107829A (en) | 2019-08-09 |
| CN110107829B true CN110107829B (en) | 2022-03-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910458706.5A Active CN110107829B (en) | 2018-11-29 | 2019-05-29 | Light bar structure and backlight module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110107829B (en) |
| TW (1) | TWI675606B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11608947B2 (en) * | 2019-09-19 | 2023-03-21 | Beijing Boe Optoelectronics Technology Co., Ltd. | Light bar, backlight assembly and display device |
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| CN2471058Y (en) * | 2001-01-09 | 2002-01-09 | 胜开科技股份有限公司 | Improved packaging device of image sensor |
| CN203517457U (en) * | 2013-08-29 | 2014-04-02 | 昆山龙腾光电有限公司 | Light-emitting diode light bar device and backlight module with light-emitting diode light bar device |
| CN204345413U (en) * | 2014-12-26 | 2015-05-20 | 昆山龙显电子有限公司 | A kind of backlight module |
| CN106332434A (en) * | 2015-06-24 | 2017-01-11 | 富葵精密组件(深圳)有限公司 | Flexible circuit board and manufacturing method thereof |
| CN107660070A (en) * | 2017-08-31 | 2018-02-02 | 广东欧珀移动通信有限公司 | Flexible PCB group and its processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101373010B1 (en) * | 2007-11-12 | 2014-03-14 | 삼성전자주식회사 | Multilayer coplanar waveguide filter unit and manufacturing method thereof |
| TW201037410A (en) * | 2009-04-07 | 2010-10-16 | Chi Mei Optoelectronics Corp | Back light module and display device applied with the same |
| TWM500268U (en) * | 2014-12-26 | 2015-05-01 | Coretronic Corp | Backlight module |
| CN205809478U (en) * | 2016-07-15 | 2016-12-14 | 合肥京东方显示光源有限公司 | Reflection tape unit, reflection tape, backlight source module and display device |
| CN206450930U (en) * | 2017-02-04 | 2017-08-29 | 上海中航光电子有限公司 | A kind of backlight module of lamp bar adhesive tape and liquid crystal display device |
| CN107315282A (en) * | 2017-08-14 | 2017-11-03 | 上海天马微电子有限公司 | A kind of backlight module and display device |
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2018
- 2018-11-29 TW TW107142812A patent/TWI675606B/en active
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2019
- 2019-05-29 CN CN201910458706.5A patent/CN110107829B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2471058Y (en) * | 2001-01-09 | 2002-01-09 | 胜开科技股份有限公司 | Improved packaging device of image sensor |
| CN203517457U (en) * | 2013-08-29 | 2014-04-02 | 昆山龙腾光电有限公司 | Light-emitting diode light bar device and backlight module with light-emitting diode light bar device |
| CN204345413U (en) * | 2014-12-26 | 2015-05-20 | 昆山龙显电子有限公司 | A kind of backlight module |
| CN106332434A (en) * | 2015-06-24 | 2017-01-11 | 富葵精密组件(深圳)有限公司 | Flexible circuit board and manufacturing method thereof |
| CN107660070A (en) * | 2017-08-31 | 2018-02-02 | 广东欧珀移动通信有限公司 | Flexible PCB group and its processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI675606B (en) | 2019-10-21 |
| CN110107829A (en) | 2019-08-09 |
| TW202021425A (en) | 2020-06-01 |
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