A light bar circuit, a direct-lit backlight module and a display device

Abstract

The present invention discloses a light bar circuit, a direct-lit backlight module and a display device. The light bar circuit includes a plurality of light bars, and each light bar includes a plurality of LED lamp beads; the LED lamp beads on the light bar are electrically connected to form four circuit traces, and the end wires of each circuit trace are connected to one path of power supply of an external power supply board; wherein, the number of LED lamp beads included in each circuit trace is the same, and the LED lamp beads in the same circuit trace are electrically connected in sequence. The light bar circuit of the present invention can be connected to power supply boards with various parameters to meet the power supply requirements of the direct-lit backlight module. At the same time, by optimizing the circuit traces inside a single light bar and the connections between the light bars, the voltage difference between the power supplies of each path of the power supply board is improved.

Description

Technical Field

[0001] The present invention relates to the field of direct-type backlight modules and all-in-one machines, and in particular to a light bar circuit, a direct-type backlight module and a display device. Background Art

[0002] In the technical field of LED backlight modules, the LED backlight market is showing a rapid development trend. Driving the LED backlight requires an external power board to provide power. Existing light bar circuits can often only be matched with proprietary power boards, that is, in order to drive the LED backlight, a proprietary power board needs to be developed, which makes it inconvenient to use and has high costs. Therefore, it is very necessary to design a light bar circuit that can simultaneously meet the parameters of the public power board on the market and the customized power board parameters, and reduce the voltage difference between the power supplies between the power boards. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to propose a light bar circuit, a direct-type backlight module and a display device, which can be connected to power boards with various parameters to meet the power supply requirements of the direct-type backlight module and improve the voltage difference between the various power supplies on the power board.

[0004] The present invention adopts the following technical solution:

[0005] On the one hand, the present invention provides a light bar circuit of a direct-type backlight module, comprising a plurality of light bars, each of which comprises a plurality of LED lamp beads; the LED lamp beads on the light bar are electrically connected to form four routing lines, and the end line of each routing line is connected to a power supply line of an external power supply board; wherein each routing line comprises the same number of LED lamp beads, and the LED lamp beads on the same routing line are electrically connected in sequence.

[0006] Preferably, the total number of the light strips is N, and N is an even number; the number of LED lamp beads on each light strip is M, and M is an even number; wherein the LED lamp beads on each light strip are evenly distributed to two routings; the number of light strips included in each routing is N / 2.

[0007] Preferably, the four routings are respectively the first routing, the second routing, the third routing and the fourth routing; the light strips are arranged in columns / rows; the LED lamp beads of the first 1 to N / 2 columns / rows of light strips are evenly distributed to the first routing and the second routing; the LED lamp beads of the last N / 2+1 to N columns / rows of light strips are evenly distributed to the third routing and the fourth routing.

[0008] Preferably, the first to M / 2 LED beads of each light bar are electrically connected in sequence, and the first LED bead of the current light bar is electrically connected to the M / 2 LED bead of the adjacent light bar, or the M / 2 LED bead of the current light bar is electrically connected to the M / 2 + 1 LED bead of the adjacent light bar; the M / 2 + 1 to M LED beads of each light bar are electrically connected in sequence, and the M / 2 + 1 LED bead of the current light bar is electrically connected to the M LED bead of the adjacent light bar, or the M LED bead of the current light bar is electrically connected to the M / 2 + 1 LED bead of the adjacent light bar.

[0009] Preferably, the first to M / 2 LED beads of each light bar are electrically connected in sequence, and the first LED bead of the current light bar is electrically connected to the M LED bead of the adjacent light bar, or the M / 2 LED bead of the current light bar is electrically connected to the M / 2 + 1 LED bead of the adjacent light bar; the M / 2 + 1 to M LED beads of each light bar are electrically connected in sequence, and the M / 2 + 1 LED bead of the current light bar is electrically connected to the M / 2 LED bead of the adjacent light bar, or the M LED bead of the current light bar is electrically connected to the first LED bead of the adjacent light bar.

[0010] Preferably, the connection line between the M / 2 + 1 LED bead and the M LED bead of each light bar includes one or more bent portions; each bent portion includes a plurality of zigzag portions.

[0011] Preferably, the zigzag portion in the bent portion includes a rectangular portion connected in series.

[0012] Preferably, the zigzag portion in the bent portion includes a semicircular portion connected in series.

[0013] In a second aspect, a direct-lit backlight module of the present invention includes: a back plate, a plurality of support columns, a reflector, and a diffuser; characterized in that it further includes the above-mentioned light bar circuit; the light bar circuit is arranged on the inner surface of the bottom of the back plate, the reflector is provided with a first hole for the LED beads to pass through, and is also provided with a second hole for the support columns to pass through; the base of the support column is fixedly connected to the back plate; the diffuser is arranged above the reflector.

[0014] In a third aspect, a display device of the present invention includes the above-mentioned direct-lit backlight module.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) The light bar circuit of the present invention evenly distributes the LED lamp beads on the light bar, so that the distributed LED lamp beads are electrically connected to form four routing paths, and the end wires of each routing path are connected to one path of power supply of the external power supply board, thereby matching the power supply board parameters of the common board on the market and meeting the power supply requirements of the direct-lit backlight module;

[0017] (2) The present invention optimizes the routing inside a single light bar and the connection lines between each light bar, improves the voltage difference between each path of power supply of the power supply board, and prevents the power-on circuit protection of the power supply board caused by too large a voltage difference, resulting in unstable power supply.

[0018] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are listed.

[0019] According to the following detailed description of the specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will more clearly understand the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an exploded view of the display device according to an embodiment of the present invention;

[0021] Figure 2 is an arrangement schematic diagram of the light bar structure according to an embodiment of the present invention;

[0022] Figure 3 is a wiring circuit diagram between each light bar before optimization according to an embodiment of the present invention;

[0023] Figure 4 is a wiring circuit diagram between each light bar after optimization according to an embodiment of the present invention;

[0024] Figure 5 is an internal routing diagram of a single light bar before optimization according to an embodiment of the present invention;

[0025] Figure 6 is an internal routing diagram of a single light bar after optimization according to an embodiment of the present invention;

[0026] Figure 7 is Figure 6 a partial enlarged view of the internal routing diagram of the single light bar shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to the drawings.

[0028] See Figures 1 to 6As shown in the figure, a display device of the present invention includes a direct - type backlight module, a middle frame 17, a liquid crystal display screen 18, and a front frame 19.

[0029] The direct - type backlight module includes: a backplane 10, a light - bar circuit 11, a plurality of support columns 12, a reflector 13, a diffusion plate 14, a prism sheet 15, and a diffusion sheet 16; the light - bar circuit 11 includes light - bars disposed on the inner surface of the bottom of the backplane 10; the reflector 13 is disposed above the light - bar circuit 11, and a first hole through which the LED lamp beads 112 on the light - bar circuit 11 pass is provided on the reflector 13; each support column 12 includes a base and a triangular blade - like structure disposed above the base, a plurality of second holes are further provided on the reflector 13, the support column passes through the second holes, and the base is fixedly connected to the backplane 10; the support column 12 is disposed between two LED lamp beads 112; the diffusion plate 14 is disposed above the reflector 13.

[0030] The diffusion plate 14, the prism sheet 15, the diffusion sheet 16, the middle frame 17, the liquid crystal display screen 18, and the front frame 19 are sequentially placed above the side edge of the backplane 10 to form a display device.

[0031] See Figures 2 to 4 As shown in the figure, the light - bar circuit includes a plurality of light - bars, and each light - bar includes a plurality of LED lamp beads; the LED lamp beads on the light - bar are electrically connected to form four - path traces, and the end - wires of each path of traces are connected to one - path power supply of an external power supply board; among them, the number of LED lamp beads included in each path of traces is the same, and the LED lamp beads in the same path of traces are sequentially electrically connected.

[0032] Further, the total number of light - bars is N, and N is an even number; the number of LED lamp beads on each light - bar is M, and M is an even number; among them, the LED lamp beads on each light - bar are evenly distributed to two paths of traces; the number of light - bars included in each path of traces is N / 2.

[0033] Specifically, Figure 2 is a structure diagram of a light - bar Lightbar arranged according to optical design. The light - bar is placed vertically. There are 10 LED lamp beads on a single light - bar, and there are a total of 18 light - bars. Among them, the distance between two adjacent LED lamp beads (belonging to different light - bars) on the left and right is 98.5 mm, and the distance between two adjacent LED lamp beads (belonging to the same light - bar) above and below is 96 mm. Specifically, the LED lamp beads are disposed on the circuit of the light - bar and formed by soldering components; a designed copper - wire circuit is provided on the light - bar; a designed backlight connection wire is provided between the external power supply board and the backlight module.

[0034] Of course, the light - bar can also be placed horizontally. The principle is the same as when the light - bar is placed vertically, and no specific description is made in this embodiment.

[0035] According to the design parameters of the power supply board of the reference board in the market, 4 circuits (four wire traces) need to be designed for the backlight. Therefore, 45 backlight LED beads are required for one circuit. The inside of a single light bar is designed with 2 wire traces. The backlight wiring schematic diagram is as shown in Figure 3 and Figure 4 shown. The inside of a single light bar is divided into 2 circuits (each circuit consists of five series-connected LED beads).

[0036] In this embodiment, the four wire traces are the first wire trace, the second wire trace, the third wire trace, and the fourth wire trace respectively; the light bars are arranged in columns; the LED beads of the first to N / 2 columns of light bars are evenly distributed to the first wire trace and the second wire trace; the LED beads of the N / 2 + 1 to Nth column / row of light bars are evenly distributed to the third wire trace and the fourth wire trace. The external power supply includes four power supplies, namely the first power supply, the second power supply, the third power supply, and the fourth power supply. The anode of the M / 2th LED bead (D16) of the first column of light bars is connected to one end P1+ of the first power supply of the external power supply board, and the cathode of the 1st LED bead (D90) of the N / 2th column of light bars is connected to the other end P1- of the first power supply of the external power supply board; the anode of the Mth LED bead (D11) of the first column of light bars is connected to one end P2+ of the second power supply of the external power supply board, and the cathode of the M / 2 + 1th LED bead (D95) of the N / 2th column of light bars is connected to the other end P2- of the second power supply of the external power supply board; the anode of the M / 2th LED bead (DA6) of the N / 2 + 1th column of light bars is connected to one end P3+ of the third power supply of the external power supply board, and the cathode of the 1st LED bead (DJ0) of the Nth column of light bars is connected to the other end P3- of the third power supply of the external power supply board; the anode of the Mth LED bead (DA1) of the N / 2 + 1th column of light bars is connected to one end P4+ of the fourth power supply of the external power supply board, and the cathode of the M / 2 + 1th LED bead (DJ5) of the Nth column of light bars is connected to the other end P4- of the fourth power supply of the external power supply board.

[0037] Refer to Figure 3 shown. In one embodiment, the 1st to M / 2th LED beads of each light bar are electrically connected in sequence, and the 1st LED bead of the current light bar is electrically connected to the M / 2th LED bead of the adjacent light bar, or the M / 2th LED bead of the current light bar is electrically connected to the 1st LED bead of the adjacent light bar; the M / 2 + 1th to Mth LED beads of each light bar are electrically connected in sequence, and the M / 2 + 1th LED bead of the current light bar is electrically connected to the Mth LED bead of the adjacent light bar, or the Mth LED bead of the current light bar is electrically connected to the M / 2 + 1th LED bead of the adjacent light bar.

[0038] Refer to Figure 4As shown, in another embodiment, the first to M / 2 LED beads of each light bar are electrically connected in sequence, and the first LED bead of the current light bar is electrically connected to the Mth LED bead of the adjacent light bar, or the M / 2th LED bead of the current light bar is electrically connected to the (M / 2 + 1)th LED bead of the adjacent light bar; the (M / 2 + 1)th to Mth LED beads of each light bar are electrically connected in sequence, and the (M / 2 + 1)th LED bead of the current light bar is electrically connected to the M / 2th LED bead of the adjacent light bar, or the Mth LED bead of the current light bar is electrically connected to the first LED bead of the adjacent light bar.

[0039] See Figure 5 As shown, in one embodiment, the connection line between the (M / 2 + 1)th LED bead and the Mth LED bead of each light bar is a straight line. Figure 3 and Figure 4 The attached drawings used are Figure 5 the light bar wiring shown.

[0040] See Figure 6 and Figure 7 As shown, in another embodiment, the connection line between the (M / 2 + 1)th LED bead and the Mth LED bead of each light bar includes one or more bent portions; each bent portion includes a plurality of zigzag portions.

[0041] Furthermore, the connection line between the LED bead electrically connected to the external power supply board and the external power supply board may also include one or more bent portions; each bent portion includes a plurality of zigzag portions.

[0042] Preferably, the zigzag portions in the bent portion include rectangular portions connected in series.

[0043] Preferably, the zigzag portions in the bent portion include semicircular portions connected in series.

[0044] It should be noted that although not shown in the drawings Figure 6 the connection method combination between the light bar shown and Figure 3 and Figure 4 each light bar shown, after replacing it with Figure 3 and Figure 4 the single light bar in Figure 6 with the light bar wiring shown, compared with using Figure 5 the light bar wiring shown, it can improve the voltage difference between the power supplies of each path of the power supply board. The following will make a detailed analysis of various combination methods.

[0045] Now, a voltage test is performed on the backlight 4 - path wiring circuit. In all experiments, the LED test power - on current is 500 mA, and the voltage of the 4 - path backlight is tested.

[0046] AdoptFigure 3 The connection method between the light bars is combined with Figure 5 the single light bar wiring method of

[0047] Adopt as Figure 5 shown in the light bar wiring method to test the two-way voltage inside a single Lightbar. The voltage of the 1 / 5 pin circuit is 16.15V, and the voltage of the 2 / 4 pin circuit is 15.62V. The pressure difference between the two-way inside is 0.53V, and the pressure difference is relatively large.

[0048] Adopt as Figure 6 shown in the light bar wiring method to test the two-way voltage inside a single Lightbar, that is, wind the 2 / 4 pin circuit, and then test the voltage of the 2 / 4 pin circuit is 16.04V. The pressure difference between the two-way inside the Lightbar is only 0.11V. According to as Figure 6 shown in the light bar wiring method, and then combined with Figure 3 wire the backlight module, test the voltage of the 4-way backlight. The voltage of the P1 circuit is measured to be 145.35V, the voltage of the P2 circuit is 144.52V, the voltage of the P3 circuit is 145.55V, the voltage of the P4 circuit is 144.08V, and the maximum pressure difference is 1.47V. The pressure differences of each circuit have been improved.

[0049] Furthermore, according to as Figure 6 shown in the light bar wiring method, and then combined with Figure 4 wire the backlight module, test the voltage of the 4-way backlight. The voltage of the P1 circuit is measured to be 144.91V, the voltage of the P2 circuit is 144.63V, the voltage of the P3 circuit is 144.98V, the voltage of the P4 circuit is 144.61V, and the maximum pressure difference is 0.37V. The pressure differences between each backlight path have been effectively improved.

[0050] The voltage measurement values of different wiring methods and internal wiring of the 4-way circuit of the backlight module are sorted out as follows, as shown in Table 1 below:

[0051] Table 1

[0052]

[0053] It can be seen that the backlight circuit effectively improves the pressure differences between each backlight path through the optimization of the light bar wiring method and the internal wiring of a single light bar. Although only three combination methods are shown in the above table, in actual applications, Figure 4 wiring method + Figure 5 internal wiring can also be adopted, and which one to use specifically can be combined according to actual applications.

[0054] In summary, for the lamp strip circuit of the direct-lit backlight module of the present invention, according to the lamp strip structure diagram arranged according to the optical design, the internal part of a single lamp strip is designed with two routing paths, which can simultaneously meet the four-way parameters of the common board power supply board and the four-way parameters of the customized power supply board; and by optimizing the wiring of the 2 / 4-pin circuit inside a single lamp strip, and also through the cross-connection lines between each lamp strip, the voltage difference between each path of the power supply board is improved.

[0055] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A lamp strip circuit of a direct-lit backlight module, characterized in that, it includes a plurality of lamp strips, and each lamp strip includes a plurality of LED lamp beads; the LED lamp beads on the lamp strip are electrically connected to form four wiring paths, and the end wires of each wiring path are connected to one path of power supply of an external power supply board; wherein, the number of LED lamp beads included in each wiring path is the same, and the LED lamp beads in the same wiring path are electrically connected in sequence; the number of LED lamp beads on each lamp strip is M, and M is an even number; the 1st to M / 2th LED lamp beads of each lamp strip are electrically connected in sequence, and the 1st LED lamp bead of the current lamp strip is electrically connected to the M / 2th LED lamp bead of the adjacent lamp strip, or the M / 2th LED lamp bead of the current lamp strip is electrically connected to the 1st LED lamp bead of the adjacent lamp strip; the (M / 2 + 1)th to Mth LED lamp beads of each lamp strip are electrically connected in sequence, and the (M / 2 + 1)th LED lamp bead of the current lamp strip is electrically connected to the Mth LED lamp bead of the adjacent lamp strip, or the Mth LED lamp bead of the current lamp strip is electrically connected to the (M / 2 + 1)th LED lamp bead of the adjacent lamp strip; the connecting wire between the (M / 2 + 1)th LED lamp bead and the Mth LED lamp bead of each lamp strip includes one or more bent portions; each bent portion includes a plurality of zigzag portions; or, the 1st to M / 2th LED lamp beads of each lamp strip are electrically connected in sequence, and the 1st LED lamp bead of the current lamp strip is electrically connected to the Mth LED lamp bead of the adjacent lamp strip, or the M / 2th LED lamp bead of the current lamp strip is electrically connected to the (M / 2 + 1)th LED lamp bead of the adjacent lamp strip; the (M / 2 + 1)th to Mth LED lamp beads of each lamp strip are electrically connected in sequence, and the (M / 2 + 1)th LED lamp bead of the current lamp strip is electrically connected to the M / 2th LED lamp bead of the adjacent lamp strip, or the Mth LED lamp bead of the current lamp strip is electrically connected to the 1st LED lamp bead of the adjacent lamp strip; the connecting wire between the (M / 2 + 1)th LED lamp bead and the Mth LED lamp bead of each lamp strip includes one or more bent portions; each bent portion includes a plurality of zigzag portions.

2. The lamp strip circuit of the direct-lit backlight module according to claim 1, characterized in that, the total number of the lamp strips is N, and N is an even number; wherein, the LED lamp beads on each lamp strip are evenly distributed to two wiring paths; the number of lamp strips included in each wiring path is N / 2.

3. The lamp strip circuit of the direct-lit backlight module according to claim 2, characterized in that, the four wiring paths are respectively a first wiring path, a second wiring path, a third wiring path and a fourth wiring path; the lamp strips are arranged in columns / rows; the LED lamp beads of the first N / 2 columns / rows of lamp strips are evenly distributed to the first wiring path and the second wiring path; the LED lamp beads of the last (N / 2 + 1)th to Nth columns / rows of lamp strips are evenly distributed to the third wiring path and the fourth wiring path.

4. The lamp strip circuit of the direct-lit backlight module according to claim 1, characterized in that, the zigzag portions in the bent portion include rectangular portions connected in series.

5. The lamp strip circuit of the direct-lit backlight module according to claim 1, characterized in that, The zigzag portion in the bent portion includes semi-circular portions connected in series.

6. A direct-lit backlight module, comprising: a back plate, a plurality of support columns, a reflective sheet, and a diffusion plate; characterized in that it further comprises a light bar circuit as described in any one of claims 1 to 5; the light bar circuit is disposed on the inner surface of the bottom of the back plate, the reflective sheet is provided with a first hole for the LED beads to pass through, and is further provided with a second hole for the support columns to pass through; the base of the support column is fixedly connected to the back plate; the diffusion plate is disposed above the reflective sheet.

7. A display device, characterized in that it comprises a direct-lit backlight module as described in claim 6.

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