CN112365796B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN112365796B CN112365796B CN202011349168.5A CN202011349168A CN112365796B CN 112365796 B CN112365796 B CN 112365796B CN 202011349168 A CN202011349168 A CN 202011349168A CN 112365796 B CN112365796 B CN 112365796B
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- backlight module
- control circuit
- driving board
- back plate
- board
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
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Abstract
The invention provides a backlight module and a display device, wherein the backlight module comprises: a back plate; the backlight module comprises a driving board arranged on a back board and a light emitting piece arranged on the driving board, wherein the driving board is provided with a first surface and a second surface which are opposite, the light emitting piece is positioned on the first surface of the driving board, the second surface comprises a connecting area, and the connecting area and the back board are not overlapped in the thickness direction of the back board; one part of the conducting layer is connected with the surface of the back plate, which is far away from the luminous element, and the other part of the conducting layer is connected with the connecting area. The invention can avoid the deviation or the overlapping of the conducting layers, thereby improving the problems of poor electrostatic protection, over-specification thickness and the like caused by the deviation or the overlapping of the conducting layers.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
The backlight module is used for providing backlight for the display panel and comprises a back plate and a driving plate arranged on the back plate. In order to prevent the light emitting devices (e.g., LED light emitting devices) on the driving board from being affected by electrostatic discharge (ESD), a conductive cloth is usually disposed between the back board and the driving board to connect the back board and the driving board, so that static electricity on the driving board is released to the back board through the conductive cloth, and the static electricity is prevented from affecting the light emitting devices.
However, the current conductive cloth is generally disposed between the back plate and the driving plate, so that the conductive cloth is prone to shift or overlap during the assembly process of the backlight module, which seriously affects the product quality.
Disclosure of Invention
The present invention is directed to at least one of the technical problems of the prior art, and provides a backlight module and a display device.
In order to achieve the above object, the present invention provides a backlight module, wherein the backlight module comprises:
a back plate;
the backlight module comprises a driving board arranged on a back board and a light emitting piece arranged on the driving board, wherein the driving board is provided with a first surface and a second surface which are opposite, the light emitting piece is positioned on the first surface of the driving board, the second surface comprises a connecting area, and the connecting area and the back board are not overlapped in the thickness direction of the back board;
one part of the conducting layer is connected with the surface of the back plate, which is far away from the luminous element, and the other part of the conducting layer is connected with the connecting area.
Optionally, a hollow structure is arranged on the back plate, the connecting area is opposite to the hollow structure, and the conductive layer covers at least a part of the hollow structure.
Optionally, the conductive layer covers the entire hollowed-out structure.
Optionally, the backplate includes a first body portion and a lug connected to the first body portion, the first body portion has a first edge, and the hollow structure and the lug are located at two sides of the first edge and are disposed adjacent to each other.
Optionally, the driving board includes a second body portion and a first connecting portion, the first connecting portion is connected to the second body portion, the first connecting portion exceeds an edge of the backplane along a first direction, the first direction intersects a thickness direction of the backplane, and the connecting portion is located on the first connecting portion;
the first connection part is configured to connect a driving circuit board for supplying an electrical signal to the driving board with the second body part.
Optionally, the backlight module further comprises an adhesive layer, and the adhesive layer bonds the driving board and the back plate together.
Optionally, the conductive layer is a conductive cloth.
Optionally, a first electrode is disposed on the connection region, the driving board further includes an electrostatic discharge control circuit and a light emission control circuit for controlling the light emission of the light emitting element, one end of the electrostatic discharge control circuit is connected to the light emission control circuit, the other end of the electrostatic discharge control circuit is connected to the first electrode, and the first electrode is connected to the conductive layer;
the electrostatic discharge control circuit is configured to conduct the light emission control circuit with the first electrode when an instantaneous current in the light emission control circuit exceeds a preset threshold.
Optionally, the electrostatic discharge control circuit includes a transient diode, one end of the transient diode is connected to the light emission control circuit, and the other end of the transient diode is connected to the first electrode.
The present invention also provides a display device, comprising: the backlight module is described above.
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 and not to limit the invention. In the drawings:
FIG. 1a is a schematic diagram of an exemplary backlight module;
FIG. 1b is a plan view of a portion of a backlight module in one example;
fig. 2a and 2b are partial plan views of a backlight module according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of FIG. 2b along section line AA';
fig. 4a and 4b are second plan views of a part of a backlight module according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1a is a schematic structural diagram of an exemplary backlight module, and fig. 1b is a plan view of a portion of the exemplary backlight module, wherein a driving board and a light emitting element are hidden in fig. 1b for clarity of illustration. As shown in fig. 1a and 1b, in this example, the backlight module includes a back plate 1', a bent portion 2', a driving plate 3' located between the back plate 1' and the bent portion 2', a light emitting element 4' located on a side of the driving plate 3' away from the back plate 1', and a conductive cloth 5' located between the driving plate 3' and the back plate 1 '. The position of the driving board 3 'for contacting with the conductive cloth 5' is provided with a connecting area, one surface of the conductive cloth 5 'contacts with the connecting area, and the other surface contacts with the back plate 1', so that static electricity on the driving board 3 'can be released to the back plate 1' through the conductive cloth 5', and the static electricity is prevented from influencing the luminous piece 4'.
However, in this example, since the conductive cloth 5' is located between the driving board 3' and the back plate 1', the conductive cloth 5' cannot be attached after the driving board 3' is mounted on the back plate 1', and thus, the conductive cloth 5' often deviates and overlaps, which causes problems such as poor electrostatic protection and excessive thickness, and seriously affects the product quality.
In view of the above, an embodiment of the present invention provides a backlight module, fig. 2a and 2b are partial plan views of the backlight module provided by the embodiment of the present invention, and fig. 3 is a cross-sectional view taken along a cross-sectional line AA' of fig. 2b, wherein the conductive layer is hidden in fig. 2a to show the connection region. As shown in fig. 2a to 3, the backlight module includes: the backlight module comprises a back plate 1, a driving plate 2, a luminous piece 3 and a conductive layer 4. Wherein the driving board 2 is disposed on the back board 1, the light emitting member 3 is disposed on the driving board 2, the driving board 2 has a first surface (i.e., a surface facing downward of the driving board 2 in fig. 3) and a second surface opposite to each other, and the light emitting member 3 is disposed on the first surface of the driving board 2. The second surface includes a connection region B, and the connection region B and the backsheet 1 do not overlap in the thickness direction of the backsheet 1. A part of the conductive layer 4 is connected to the surface of the back plate 1 facing away from the luminous element 3 and another part is connected to the connection region B.
In the embodiment of the present invention, the thickness direction of the rear plate 1 may be a vertical direction in fig. 3. The light emitting member 3 may be a light emitting diode, and the light emitting member 3 may emit light under the control of a driving signal. As shown in fig. 3, a portion of the conductive layer 4 is connected to a surface of the back plate 1 away from the light emitting element 3 (i.e., an upward surface in fig. 3), and another portion is connected to a connection region B, which may be provided with an electrode for discharging static electricity, so that the driving board 2 can discharge static electricity to the back plate 1 through the conductive layer 4, and the static electricity on the driving board 2 is prevented from affecting the light emitting element 3. Because a part of the conductive layer 4 is located on the surface of the back plate 1 away from the luminous element 3, the other part of the conductive layer is located on the second surface of the driving plate 2, and the connecting area B and the back plate 1 are not overlapped in the thickness direction of the back plate 1, the conductive layer 4 is not shielded by the driving plate 2, when the conductive layer 4 and the driving plate 2 are arranged, the driving plate 2 can be arranged on the back plate 1 firstly, and then the conductive layer 4 is arranged on the back plate 1, so that the probability of deviation or overlapping of the conductive layer 4 is reduced as much as possible. Even if conducting layer 4 appears squinting or overlapping, because drive plate 2 can not cause the shelter to conducting layer 4, the staff can observe conducting layer 4 to be convenient for to the heavy industry restoration (Rework) operation of conducting layer 4.
In summary, the backlight module according to the embodiment of the invention can prevent the conductive layer 4 from deviating or overlapping, thereby improving the problems of poor electrostatic protection and over-thickness caused by the deviation or overlapping.
One structure of the backlight module according to the embodiment of the present invention is described in detail with reference to fig. 2a to 3, specifically, as shown in fig. 3, a bent portion 5 is disposed on a side of the back plate 1 facing a light emitting side of the backlight module, the bent portion 5 and the back plate 1 form a "U" shaped structure, and the light emitting element 3 is located between the driving plate 2 and the bent portion 5. Wherein, the bending part 5 and the back plate 1 can be an integral structure. The backlight module also comprises an adhesive layer 6, and the driving board 2 and the back plate 1 are bonded together by the adhesive layer 6. In addition, the backlight module may further include optical components such as a light guide plate and a reflective plate, so that the light emitted from the light emitting element 3 can be adjusted by the optical components such as the light guide plate and the reflective plate and then emitted from the backlight module along a predetermined direction.
In some embodiments, the conductive layer 4 is a conductive cloth. The material of the conductive layer 4 may include a flexible material (e.g., polyester fiber) and a conductive material (e.g., copper). In some embodiments, the material of the conductive cloth further includes an oxidation-resistant material (e.g., nickel), so that the conductive layer 4 has better conductivity, and the oxidation resistance, corrosion resistance and interference shielding ability of the conductive layer 4 are improved.
Referring to fig. 2a to 3, in some embodiments, a hollow structure H is disposed on the back plate 1, the connection region B is disposed opposite to the hollow structure H, and the conductive layer 4 covers at least a portion of the hollow structure H.
In the embodiment of the present invention, the connection area B is disposed opposite to the hollow structure H, that is, a plane parallel to the back plate 1 is used as a reference surface, and an orthographic projection of the connection area B on the reference surface is located within an orthographic projection range of the hollow structure H on the reference surface. The hollow structure H may be an opening disposed on the back plate 1. The connecting area B can be exposed through the hollow structure H, so that the conducting layer 4 located on one side of the backboard 1 departing from the luminous piece 3 can be connected with the connecting area B through the hollow structure H. Because the conducting layer 4 is the conducting cloth, therefore, it can be set up on backplate 1 through the mode of pasting, simultaneously, because the installation of conducting layer 4 and adjustment are not restricted by drive plate 4, the probability that conducting layer 4 pasting squinted or overlaps reduces, even take place to paste squint or overlap, also can repair in time, consequently, can improve backlight unit's packaging efficiency. And, when setting up drive plate 2, can observe the position of joining region B through hollow out construction H, joining region B's shape can be the rectangle, consequently, through observing joining region B's position, can confirm whether drive plate 2 takes place the skew to even adjust drive plate 2, thereby ensure that the clearance (Gap) between optical components such as drive plate 2 and light guide plate satisfies the technology needs, avoid the local regional luminous luminance of backlight unit that leads to from this not enough scheduling problem.
In some embodiments, as shown in fig. 2b, the conductive layer 4 covers the entire hollow structure H. In the embodiment of the present invention, the conductive layer 4 may be disposed along the edge of the hollow structure H, so that an alignment mark (mark) for alignment does not need to be disposed before the conductive layer 4 is disposed, and the process is relatively simple.
In some embodiments, the backboard 1 comprises a first body portion 11 and a lug 12 connected to the first body portion 11, the first body portion 11 has a first edge, and the hollow-out structure H and the lug 12 are located at two sides of the first edge and are disposed adjacent to each other.
In the embodiment of the present invention, the backlight module has a binding end (BP end) for binding with a driving circuit board for providing an electrical signal to the driving board 2, and the first edge may refer to a side of the first body part 11 near the binding end, that is, a side shown in fig. 2 b. The lug 12 is used for fixedly connecting the driving circuit board with the back plate 1, and the lug 12 and the first body part 11 may be an integral structure. Specifically, the lug 12 may be obtained by folding a part of the first body 11 along the first edge, and after the part of the first body 11 is folded along the first edge, an opening is formed at an original position of the part.
In some embodiments, the first electrode is disposed on the connection region B, the driving board 2 further includes an electrostatic discharge control circuit and a light emission control circuit for controlling the light emission of the light emitting element 3, one end of the electrostatic discharge control circuit is connected to the light emission control circuit, the other end of the electrostatic discharge control circuit is connected to the first electrode, and the first electrode is connected to the conductive layer 4. The electrostatic discharge control circuit is configured to conduct the light emission control circuit with the first electrode when an instantaneous current in the light emission control circuit exceeds a preset threshold.
In the embodiment of the present invention, the driving board 2 may be first disposed on the back board 1, and the first electrode may be disposed on the driving board 2 at a position corresponding to the connection region B, and the material of the first electrode may include copper. Then, the conductive layer 4 is disposed on the side of the back plate 1 away from the light emitting element 3, and a portion of the conductive layer 4 is in contact with the back plate 1, and another portion is in contact with the first electrode on the connection region B, so that the driving board 2 can be connected to the back plate 1 through the conductive layer 4. When the instantaneous current in the light-emitting control circuit exceeds a preset threshold value, the electrostatic discharge control circuit can conduct the light-emitting control circuit with the first electrode, so that static electricity is discharged onto the back plate 1 through the conducting layer 4, and the light-emitting piece 3 is prevented from being damaged by static electricity; when the light-emitting control circuit works normally, the electrostatic discharge control circuit can disconnect the light-emitting control circuit from the first electrode, thereby avoiding electric leakage to the back plate 1 through the conductive layer 4.
In some embodiments, the esd control circuit may include a Zener diode (Zener) or a transient diode (TVS), and optionally, in an embodiment of the present invention, the esd control circuit includes a transient diode, and one end of the transient diode is connected to the lighting control circuit, and the other end of the transient diode is connected to the first electrode. The transient diode has the advantages of fast response time, large transient power, low leakage current and the like, and is beneficial to realizing the lightness and thinness of the driving board 2.
Next, another structure of the backlight module according to the embodiment of the invention is described in detail with reference to fig. 4a and 4b, where fig. 4a and 4b are partial plan views of the backlight module according to the embodiment of the invention, and the conductive layer is hidden in fig. 4a to show the connection region. In other embodiments, as shown in fig. 4a and 4B, the driving board 2 includes a second body portion 21 and a first connecting portion 22, the first connecting portion 22 is connected to the second body portion 21, the first connecting portion 22 extends beyond the edge of the backplane 1 along a first direction, the first direction intersects with the thickness direction of the backplane 1, and the connecting region B is located on the first connecting portion 22. The first connection portion 22 is configured to connect a driving circuit board for supplying an electrical signal to the driving board 2 with the second body portion 21.
In the embodiment of the present invention, the first direction may be perpendicular to the thickness direction of the back plate 1, and optionally, the first direction is perpendicular to the extending direction of the first edge mentioned in the above embodiment. In some embodiments, the connection region B is disposed on a portion of the first connection portion 22 close to the back plate 1, thereby minimizing the size of a portion of the conductive layer 4 located outside the back plate 1. The drive plate 2 further includes a second connection portion 23, and the second connection portion 23 is connected to the first connection portion 22. The second connecting portion 23 extends along a second direction, the second direction can be perpendicular to the thickness direction and the first direction of the back plate 1, and the second connecting portion 23 can be provided with a conductive contact piece for being connected with a driving circuit board.
It should be noted that, in the embodiment of the present invention, except that the positions of the connection region B and the conductive layer 4 are different from the schemes shown in fig. 2a to 3, the arrangement of the remaining components may be the same as the schemes shown in fig. 2a to 3, and therefore, the description thereof is omitted.
In summary, the backlight module according to the embodiment of the present invention can improve the problems of poor static prevention and irregular thickness caused by the deflection or overlapping of the conductive layer 4, and compared with the schemes shown in fig. 1a and fig. 1b, in the embodiment of the present invention, the conductive layer 4 does not need to be disposed between the driving board 4 and the back plate 1, and the size of the conductive layer can be set to be larger, so that the contact area between the conductive layer 4 and the back plate 1 is larger, and the static protection effect is better.
An embodiment of the present invention further provides a display device, where the display device may be: the electronic paper, the display panel, the mobile phone, the tablet computer, the television, the display, the notebook computer, the digital photo frame, the navigator and other products or components with display functions. The display device comprises the backlight module.
By adopting the display device provided by the embodiment of the invention, the backlight module can avoid the problems of deviation or stacking of the conducting layers and the like, so that the problems of poor static prevention, thickness oversize and the like caused by the deviation or stacking of the conducting layers are improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A backlight module is characterized in that the backlight module comprises:
a back plate;
a conductive layer;
the backlight module comprises a driving board arranged on a back board and a light emitting piece arranged on the driving board, wherein the driving board is provided with a first surface and a second surface which are opposite, the light emitting piece is positioned on the first surface of the driving board, the second surface comprises a connecting area, and the connecting area and the back board are not overlapped in the thickness direction of the back board;
the backboard is provided with a hollow structure, the connecting area is exposed by the hollow structure, one part of the conducting layer is connected with the surface of the backboard, which deviates from the luminous piece, and the other part of the conducting layer is connected with the connecting area through the hollow structure.
2. The backlight module as claimed in claim 1, wherein the connecting region is opposite to the hollow structure, and the conductive layer covers at least a portion of the hollow structure.
3. The backlight module as claimed in claim 2, wherein the conductive layer covers the entire hollow structure.
4. The backlight module as claimed in claim 2, wherein the back plate includes a first body portion and a protrusion connected to the first body portion, the first body portion has a first edge, and the hollow structure and the protrusion are disposed adjacent to each other on two sides of the first edge.
5. The backlight module according to claim 1, wherein the driving board comprises a second body portion and a first connecting portion, the first connecting portion is connected to the second body portion, the first connecting portion extends beyond an edge of the back plate along a first direction, the first direction intersects with a thickness direction of the back plate, and the connecting portion is located on the first connecting portion;
the first connection part is configured to connect a driving circuit board for supplying an electrical signal to the driving board with the second body part.
6. The backlight module according to any of claims 1-5, further comprising an adhesive layer bonding the driving board and the back plate together.
7. The backlight module according to any one of claims 1 to 5, wherein the conductive layer is a conductive cloth.
8. The backlight module according to any of claims 1 to 5, wherein a first electrode is disposed on the connection region, the driving board further comprises an electrostatic discharge control circuit and a light emission control circuit for controlling light emission of the light emitting element, one end of the electrostatic discharge control circuit is connected to the light emission control circuit, the other end of the electrostatic discharge control circuit is connected to the first electrode, and the first electrode is connected to the conductive layer;
the electrostatic discharge control circuit is configured to conduct the light emission control circuit with the first electrode when an instantaneous current in the light emission control circuit exceeds a preset threshold.
9. The backlight module according to claim 8, wherein the ESD control circuit comprises a transient diode, one end of the transient diode is connected to the light-emitting control circuit, and the other end of the transient diode is connected to the first electrode.
10. A display device, comprising: a backlight module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011349168.5A CN112365796B (en) | 2020-11-26 | 2020-11-26 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011349168.5A CN112365796B (en) | 2020-11-26 | 2020-11-26 | Backlight module and display device |
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| CN112365796A CN112365796A (en) | 2021-02-12 |
| CN112365796B true CN112365796B (en) | 2022-09-27 |
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| CN202011349168.5A Active CN112365796B (en) | 2020-11-26 | 2020-11-26 | Backlight module and display device |
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