Patent Application
20220210909
The present disclosure claims the priority from Chinese Patent Application No. 202023195973.5, filed with the Chinese Patent Office on Dec. 25, 2020, and entitled “BACKLIGHT SOURCE AND DISPLAY DEVICE”, which is hereby incorporated by reference in its entirety.
The disclosure relates to the technical field of backlight structures, in particular to a backlight source and a display device.
In the process of assembling a display device, semi-finished products of a light bar and a reflector are assembled into an iron frame in an oblique insertion way. In order to prevent the extending end of the light-emitting element LED (light-emitting diode) on the light bar from interfering with the iron frame, the iron frame needs to be perforated, so the perforated position is exposed.
During the electro-static discharge (ESD) test, because the perforated position is unprotected, static electricity can directly act on pins of the LED, resulting in LED damage. The original design adopts the edge-covering mylar to wrap the perforated position, but due to the manufacturing process and assembly capabilities, the perforated position cannot be completely sealed and cannot prevent static electricity from entering.
The disclosure provides the following technical solutions.
In the first aspect, the disclosure provides a backlight source, including a light bar and a metal frame;
the light bar is located on one side of the metal frame; and the side, containing the light bar, of the metal frame has a notch;
the light bar includes a light-emitting unit;
the light-emitting unit includes a plurality of light-emitting groups;
each of the plurality of light-emitting groups include at least one first light-emitting group and at least one second light-emitting group;
the first light-emitting group includes N light-emitting elements; the light-emitting element numbered n is connected in series with the light-emitting element numbered n+1 successively, where 1≤n≤N−1; the light-emitting element numbered 1 and the light-emitting element numbered N are arranged adjacently; and the light-emitting element numbered 1 and the light-emitting element numbered 2 are the farthest apart; and the second light-emitting group includes M light-emitting elements; the light-emitting element numbered m is connected in series with the light-emitting element numbered m+1 successively, where 1≤m≤M−1; and the light-emitting element numbered 1 and the light-emitting element numbered M are the farthest apart.
According to the above-mentioned backlight source, the backlight source includes the metal frame and the light bar arranged on one side of the metal frame. Specifically, the metal frame is provided with a notch on the side provided with the light bar; the light bar includes a light-emitting unit, the light-emitting unit includes a plurality of light-emitting groups, and each light-emitting group includes at least one first light-emitting group and at least one first light-emitting group. When the first light-emitting group and the second light-emitting group are specifically set, the first light-emitting group includes N light-emitting elements, and the second light-emitting group includes M light-emitting elements. When the M light-emitting elements in the second light-emitting group are specifically set, the light-emitting element numbered m and the light-emitting element numbered m+1 in the M light-emitting elements are connected in series, so that the light-emitting element numbered 1 and the light-emitting element numbered M are the farthest apart. In other words, the M light-emitting elements in the second light-emitting group are arranged in sequence and connected in series according to their physical positions. When the N light-emitting elements in the first light-emitting group are specifically set, the light-emitting element numbered n is connected in series with the light-emitting element numbered n+1 successively, the light-emitting element numbered 1 and the light-emitting element numbered N are arranged adjacently, and the light-emitting element numbered 1 and the light-emitting element numbered 2 are the farthest apart. In other words, the N light-emitting elements in the first light-emitting group are not arranged in sequence and connected in series according to their physical positions. Specifically, when the static electricity entering from the notch acts on the light-emitting element numbered 1 in the first light-emitting group, the electrostatic current flows along the light-emitting element numbered 1 through the light-emitting elements in the series-connected circuit until the current is transferred to the light-emitting element numbered N. Electrostatic energy flows through the entire series-connected first light-emitting group, so that the electrostatic energy is dispersed.
The above-mentioned backlight source changes the positions of multiple light-emitting elements in the first light-emitting group to make the light-emitting element on which the electrostatic current acts be regarded as the light-emitting element numbered 1 in the first light-emitting group, so that the electrostatic energy can flow along the light-emitting element numbered 1 to the light-emitting element numbered N sequentially. In such a way, the electrostatic energy can be dispersed, and one light-emitting element can be prevented from being subjected to electrostatic energy alone, thereby achieving the effect of preventing ESD from damaging a single light-emitting element.
Optionally, the orthographic projection of the first light-emitting group on the metal frame at least partially covers the notch, and the orthographic projection of the second light-emitting group on the metal frame and the notch are non-overlapped.
Optionally, the light bar further includes a circuit board, the circuit board includes a first circuit board and a second circuit board that are connected to each other, and the light-emitting unit is located on the first circuit board.
Optionally, the orthographic projection of the second circuit board on the metal frame is at least partially located in the notch, and the second circuit board and the metal frame are non-overlapped.
Optionally, the first circuit board has middle pads, a first pole and a second pole of each light-emitting element are respectively fixed to two adjacent middle pads, and the light-emitting group has at least one positive pad.
Optionally, the second circuit board has at least one positive input terminal and at least one negative input terminal, one of the light-emitting groups is arranged between the positive input terminal and the negative input terminal, the positive input terminal is electrically connected to a positive pole of the light-emitting element numbered 1 in the one light-emitting group through a positive pad, and the negative input terminal is electrically connected to a negative pole of the light-emitting element numbered N or M in the one light-emitting group.
Optionally, the orthographic projection of the light-emitting element numbered 1 in the first light-emitting group on the metal frame is at least partially located in the notch.
Optionally, the width of the notch is one time or above the width of the second circuit board.
In the second aspect, the disclosure also provides a display device, including a display panel and any one of the backlight sources provided by the above technical solutions.
In order to make the purpose, technical solutions and advantages of the disclosure clearer, the disclosure will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the disclosure, rather than all of the embodiments. Based on the embodiments of the disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the disclosure.
The backlight source in the related art generally includes a light bar and an iron frame, the light bar is arranged on one side of the iron frame, and the light bar includes a plurality of light-emitting units, and each light-emitting unit includes a plurality of light-emitting groups.
The structure shown in
The iron frame 01 is provided with a notch (that is, the perforated position), and the notch corresponds to the second pole of the LED light {circle around (5)}′. When the electro-static discharge (ESD) test is performed, the perforated position is unprotected, and the static electricity will directly act on the first pole of the LED light {circle around (5)}′. As the LED light {circle around (5)}′ is subjected to electrostatic energy alone, damage of the LED light {circle around (5)}′ will be caused.
In view of this, the present application provides a backlight source, which can prevent one light-emitting element from being subjected to electrostatic energy alone, thereby achieving the effect of preventing the ESD from damaging a single light-emitting element.
Please refer to
the light bar is located on one side of the iron frame 1; and the side, containing the light bar, of the iron frame 1 is provided with a notch N (that is, the perforated position);
the light bar includes a light-emitting unit;
the light-emitting unit includes a plurality of light-emitting groups; and
the plurality of light-emitting groups include at least one first light-emitting group and at least one second light-emitting group; where the orthographic projection of the first light-emitting group on the iron frame 1 at least partially covers the notch N, and the orthographic projection of the second light-emitting group on the iron frame 1 and the notch N are non-overlapped.
Specifically, the first light-emitting group includes N light-emitting elements; the light-emitting element numbered n is connected in series with the light-emitting element numbered n+1 successively, where 1≤n≤N−1; the light-emitting element numbered 1 and the light-emitting element numbered N are arranged adjacently; and the light-emitting element numbered 1 and the light-emitting element numbered 2 are the farthest apart.
The second light-emitting group includes M light-emitting elements, the light-emitting element numbered m is connected in series with the light-emitting element numbered m+1 successively, where 1≤m≤M−1; and the light-emitting element numbered 1 and the light-emitting element numbered M are the farthest apart.
In an implementation manner, exemplarily, description is made by taking the first light-emitting group and the second light-emitting group each including five light-emitting elements as an example. It should be understood that other number of the light-emitting elements is also possible, and will not be repeated here.
When the five light-emitting elements in the first light-emitting group are specifically set, as shown in
Since the orthographic projection of the first pole of the LED light {circle around (1)} in the first light-emitting group on the iron frame 1 is at least partially located in the notch N, the LED light {circle around (1)} corresponds to the notch N of the iron frame 1 (that is, the perforated position). Specifically, when the static electricity entering from the notch N acts on the LED light {circle around (1)} numbered 1 in the first light-emitting group, the electrostatic current flows along the LED light {circle around (1)} numbered 1 through other light-emitting elements in the series-connected circuit in sequence until the current is transferred to the LED light {circle around (5)} numbered 5, and the electrostatic energy flows through the entire series-connected first light-emitting group, so that the electrostatic energy is dispersed.
When the backlight source provided by the present application is specifically set, the light bar may also be set to include a first circuit board and a second circuit board; the above-mentioned first light-emitting group and second light-emitting group are both arranged on the first circuit board; and a positive input terminal A and a negative input terminal K are arranged on the first surface of the second circuit board, which satisfies that one light-emitting group is arranged between the positive input terminal A and the negative input terminal K. It is worth noting that the orthographic projection of the second circuit board on the iron frame 1 is at least partially located in the notch N, and the second circuit board and the iron frame 1 are non-overlapped. The width L of the notch N is one time or above the width of the second circuit board.
Please continue to refer to
It should be understood that the middle pad 6 plays a role in electrical connection, and the current can flow between the LEDs connected by the middle pad 6. Take the LED light {circle around (2)} in
It should be noted that the middle pad 6 welded to the second pole of the LED light {circle around (1)}, the middle pad 6 welded to the first pole of the LED light {circle around (2)}, and the middle pad 6 welded to the second pole of the LED light {circle around (5)} shown in
It is worth noting that the middle pad 6 welded to the second pole of the LED light {circle around (1)}, the middle pad 6 welded to the first pole of the LED light {circle around (2)}, and the middle pad 6 welded to the second pole of the LED light {circle around (5)} are located on the same side of the first circuit board 2, so that when the above three middle pads 6 are connected to the routing wire or the lead on the other side of the first circuit board 2, via holes need to be formed on the middle pads 6. Exemplarily, as shown in
Of course, when the positive input terminal A is connected to a positive input terminal routing wire 5, a via hole structure also needs to be arranged on the second circuit board; and when the negative input terminal K is connected to a negative input terminal routing wire 7, a via hole structure also needs to be arranged on the second circuit board 3.
Please refer to the structure in
It is worth noting that, since the orthographic projection of the second light-emitting group on the iron frame 1 and the notch N are non-overlapped, the structure in the second light-emitting group can adopt the arrangement form of LED light {circle around (1)}′, LED light {circle around (2)}′, LED light {circle around (3)}′, LED light {circle around (4)}′ and LED light {circle around (5)}′ in the related art.
When the five light-emitting elements in the second light-emitting group are specifically set, the structure as shown in
Of course, the backlight source provided by the embodiments of the present application may include multiple second light-emitting groups, as shown in
In another implementation manner, exemplarily, description is made by taking the first light-emitting group and the second light-emitting group each including six light-emitting elements as an example. It should be understood that other number of light-emitting elements is also possible, which will not be repeated here.
When the six light-emitting elements in the first light-emitting group are specifically set, as shown in
In the structure shown in
Similarly, since the orthographic projection of the second light-emitting group on the iron frame 1 and the notch N are non-overlapped, the structure in the second light-emitting group can adopt the arrangement form in the related art.
When the backlight source provided by the present application is specifically set, the light bar can be set to further include a first circuit board 2 and a second circuit board 3, and the above-mentioned first light-emitting group and second light-emitting group are both arranged on the first circuit board 2. A positive input terminal A and a negative input terminal K are arranged on the first surface of the second circuit board 3, which satisfies that one light-emitting group is arranged between the positive input terminal A and the negative input terminal K. It is worth noting that the orthographic projection of the second circuit board 3 on the iron frame 1 is at least partially located in the notch N, and the second circuit board 3 and the iron frame 1 are non-overlapped. The width L of the notch N is one time or above the width of the second circuit board 3.
Specifically, the positive input terminal A is connected to a positive pad 4 welded to the first pole of the LED light {circle around (6)} through a positive input terminal routing wire located on the second surface of the second circuit board 3; a middle pad welded to the second pole of the LED light {circle around (6)} is welded with the LED light {circle around (5)}; the LED light {circle around (5)}, the LED light {circle around (4)}, the LED light {circle around (3)} and the LED light {circle around (2)} are connected by middle pads 6 successively; the first pole of the LED light {circle around (1)} is welded to a middle pad 6, which is connected to a middle pad 6 welded to the second pole of the LED light {circle around (2)} through a lead wire located on the second surface of the circuit board 2; and the second pole of the LED light {circle around (1)} is welded with a middle pad 6 and is connected with the negative input terminal K through a negative input terminal routing wire on the second surface of the second circuit board 3.
It should be understood that the middle pad 6 plays a role in electrical connection, and current can flow between the LEDs connected by the middle pad 6. Take the LED light {circle around (2)} in
It should be noted that, as shown in
It is worth noting that, similarly, since the middle pad 6 welded to the first pole of the LED light {circle around (1)} and the middle pad 6 welded to the second pole of the LED light {circle around (2)} are located on the same side of the first circuit board 2, then when the above two middle pads 6 are connected to the routing wire or lead located on the other side of the first circuit board 2, via holes need to be formed in the middle pad 6. Exemplarily, as shown in
Of course, when the positive input terminal A is connected to a positive input terminal routing wire 5, a via hole structure also needs to be arranged on the second circuit board 3; and when the negative input terminal K is connected to a negative input terminal routing wire 7, a via hole structure also needs to be arranged on the second circuit board 3.
Please refer to
Obviously, compared with the structure shown in
Of course, the backlight source provided by the embodiments of the present application may include multiple second light-emitting groups, as shown in
In the second aspect, the disclosure also provides display device, including any one of the backlight sources provided by the above technical solutions.
Obviously, those skilled in the art can make various changes and variations to the disclosure without departing from the spirit and scope of the disclosure. In this way, if these modifications and variations of the disclosure fall within the scope of the claims of the present application and their equivalent technologies, the disclosure is also intended to include these changes and variations.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202023195973.5 | Dec 2020 | CN | national |
