A light source module and a backlight display module

Abstract

The present invention discloses a light source module and a backlight display module, wherein the light source module comprises a flexible printed circuit board and a plurality of side-emitting LEDs, wherein: the flexible printed circuit board is extended along a central axis, the plurality of side-emitting LEDs are sequentially arranged along the central axis and bonded to the flexible printed circuit board, and the light-emitting surface of any one of the plurality of side-emitting LEDs is perpendicular to the bonding surface of the flexible printed circuit board. The light source module in the embodiment of the present invention adopts a combination of a flexible printed circuit board and a side-emitting LED, and utilizes the elastic deformation of the flexible printed circuit board, so that displays with different curvatures can share the light source module of the same specification, thereby improving the versatility of the light source module and saving costs.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a light source module and a backlight display module. Background Art

[0002] With the development of economy, consumers have higher and higher requirements for monitors, and monitors are gradually developing from thick and wide borders to thin and light with narrow borders. Traditional curved monitor backlight strips use TOP luminous LEDs, so the light strip circuit board needs to be made according to the projection curvature of the monitor, and monitors with different curvatures need to design light strip circuit boards with different curvatures. The backlight strips of monitors with different curvatures are not compatible, which makes the TOP luminous LEDs less versatile. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a light source module and a backlight display module. The light source module adopts a combination of a flexible printed circuit board and a side-emitting LED. By utilizing the elastic deformation of the flexible printed circuit board, displays with different curvatures can share the light source module of the same specification, thereby improving the versatility of the light source module and saving costs.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a light source module, which includes a flexible printed circuit board and a plurality of side-emitting LEDs, wherein:

[0005] The flexible printed circuit board is extended along the central axis, the plurality of side-emitting LEDs are sequentially arranged along the central axis and bonded to the flexible printed circuit board, and the light-emitting surface of any one of the plurality of side-emitting LEDs is perpendicular to the bonding surface of the flexible printed circuit board;

[0006] The flexible printed circuit board is provided with a window groove, and any one of the plurality of side-emitting LEDs is located in the window groove.

[0007] The flexible printed circuit board comprises an insulating layer, a copper layer, a solder resist layer and a bottom layer, wherein the insulating layer is arranged on the bottom layer, the copper layer is arranged on the insulating layer, and the solder resist layer is arranged on the copper layer.

[0008] Any one of the plurality of side-emitting LEDs has a plastic bracket and a metal pin, and the metal pin is embedded in the plastic bracket.

[0009] The plastic bracket is in contact with the insulating layer of the flexible printed circuit board, and the metal pin is soldered on the copper layer of the flexible printed circuit board through solder paste.

[0010] The window opening groove comprises a first window opening groove and a second window opening groove, the plastic bracket is located in the first window opening groove, and the metal pin is located in the second window opening groove.

[0011] The contact surface between the plastic bracket and the first window groove is a first contact surface, and the contact surface between the metal pin and the second window groove is a second contact surface;

[0012] The shape of the first window groove is formed by increasing the periphery of the first contact surface by no more than 0.05 mm;

[0013] The shape of the second window groove is formed by increasing the periphery of the second contact surface by no more than 0.1 mm.

[0014] The light source module has a connector, which is arranged on a flexible printed circuit board. The connector has one or more positive pins and one or more negative pins. The positive poles of the side-emitting LEDs among the several side-emitting LEDs are connected in parallel to the positive pins of the connector, and the negative poles of the side-emitting LEDs among the several side-emitting LEDs are connected in parallel to the negative pins of the connector.

[0015] The flexible printed circuit board is provided with a connecting groove, and the connector is located in the connecting groove.

[0016] A positive pin of the connector is electrically connected to the positive poles of more than one side-emitting LED; a negative pin of the connector is electrically connected to the negative poles of more than one side-emitting LED.

[0017] Correspondingly, an embodiment of the present invention further provides a backlight display module, which includes the light source module, reflective paper, light guide plate and optical film group mentioned above, wherein:

[0018] The reflective paper is arranged above the flexible printed circuit board;

[0019] The light guide plate is arranged above the reflective paper, and the light guide plate is arranged on the light emitting surface of the plurality of side-emitting LEDs;

[0020] The optical film group is arranged above the light guide plate.

[0021] The backlight display module also includes: an outer frame, a back plate, a liquid crystal panel and a thermally conductive double-sided adhesive. The thermally conductive double-sided adhesive is located at the bottom of the light source module, and the position of the thermally conductive double-sided adhesive corresponds to the plurality of side-emitting LEDs. The liquid crystal panel is located above the optical film group. The outer frame and the back plate encapsulate the liquid crystal panel, the light source module, the reflective paper, the light guide plate, the optical film group and the thermally conductive double-sided adhesive to form a backlight display module.

[0022] The backplane is a fully enclosed backplane or a backplane with a frame structure.

[0023] The present invention provides a light source module and a backlight display module. The flexible printed circuit board used in the light source assembly has elastic deformation performance and can be applied to displays with different curvatures, thereby improving the versatility of the product. The light source module uses a plurality of side-emitting LEDs assembled on the flexible printed circuit board. Compared with the original light source module, it has the advantages of large circuit board width, large line width, and small line resistance. While meeting the advantage of large circuit board width, complex circuits can be involved on the flexible printed circuit board, thereby realizing the control of a single side-emitting LED. The light source module uses a plurality of side-emitting LEDs assembled on the flexible printed circuit board, which relaxes the width restriction of the backlight circuit board, improves the heat dissipation performance of the circuit board, and can realize the partition control of the side-emitting LED. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a light source module in an embodiment of the present invention.

[0026] Figure 2 Schematic diagram of the structure of a side-emitting LED in an embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of a side-emitting LED in an embodiment of the present invention.

[0028] Figure 4 Schematic diagram of the structure of the window groove in the embodiment of the present invention.

[0029] Figure 5 Schematic diagram of the structure of the connector in the embodiment of the present invention.

[0030] Figure 6 It is a schematic diagram of the partial structure of the backlight display module in an embodiment of the present invention.

[0031] Figure 7 It is a schematic cross-sectional structure diagram of a backlight display module in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example

[0034] Figure 1 shows a schematic structural diagram of a light source module in an embodiment of the present invention, Figure 2 FIG. 1 shows a schematic diagram of the structure of a side-emitting LED in an embodiment of the present invention. Figure 3 The schematic diagram of the cross-sectional structure of the side-emitting LED in the embodiment of the present invention is shown. The light source module provided by the embodiment of the present invention can be compatible with backlight display modules of different curvatures. The light source module includes a flexible printed circuit board 60 and a plurality of side-emitting LEDs 70, wherein: the flexible printed circuit board 60 is extended along the central axis, the plurality of side-emitting LEDs 70 are sequentially arranged along the central axis and bonded to the flexible printed circuit board 60, and the light-emitting surface of any of the plurality of side-emitting LEDs 70 is perpendicular to the bonding surface of the flexible printed circuit board 60. The plurality of side-emitting LEDs 70 are arranged side by side on the flexible printed circuit board 60, located at one end of the flexible printed circuit board 60; the flexible printed circuit board 60 adopts a single-layer aluminum substrate with good elastic deformation ability, so that backboards of different curvatures can share the same specification of light source modules, saving costs; the single-layer aluminum substrate can realize the jumper of the cross-line through a 0Ω resistor.

[0035] The flexible printed circuit board 60 includes an insulating layer 64a, a copper layer 64b, a solder resist layer 64c and a bottom layer 62. The top of the bottom layer 62 is connected to the bottom surface of the insulating layer 64a, the top surface of the insulating layer 64a is connected to the bottom of the copper layer 64b, and the top of the copper layer 64b is connected to the solder resist layer 64c, that is, the insulating layer 64a is arranged on the bottom layer 62, the copper layer 64b is arranged on the insulating layer 64a, and the solder resist layer 64c is arranged on the copper layer 64b. The solder resist layer 64c, the insulating layer 64a and the copper layer 64b are the contact layers 64 between the side-emitting LEDs 70 and the flexible printed circuit board 60. The bottom layer 62 may include a connection layer, a prohibited wiring layer and a visible grid layer, etc. The prohibited wiring layer is used in automatic wiring, and the visible grid layer is for the designer to facilitate positioning when drawing.

[0036] Any one of the side-emitting LEDs 70 has a plastic bracket 72 and a metal pin 74 , and the metal pin 74 is embedded in the plastic bracket 72 .

[0037] Figure 4 The schematic diagram of the structure of the window opening groove in the embodiment of the present invention is shown, the flexible printed circuit board 60 has a window opening groove, and any one of the plurality of side-emitting LEDs 70 is located in the window opening groove. In the window opening process of the flexible printed circuit board, the solder resist layer 64c is removed, the copper layer 64b and the insulating layer 64a are exposed, and the window opening groove is formed, and the window opening groove is used to set the side-emitting LED 70; the window opening groove is a pit, which can limit the movement of the side-emitting LED 70 and reduce the displacement rate of the side-emitting LED 70.

[0038] Specifically, the plastic bracket and the metal pin are located in the window groove. The plastic bracket 72 contacts the insulating layer 64a of the flexible printed circuit board 60 through the window groove, and the metal pin 74 is connected to the copper layer 64b on the window groove by soldering with solder paste 110. The solder paste 110 fixes the side-emitting LED on the flexible printed circuit board. The metal pin 74 is arranged in the plastic bracket 72, which can reduce the size of the side-emitting LED and reduce the thickness of the light source module. It should be noted that the window groove includes a first window groove 132 and a second window groove 131, the plastic bracket 72 is located in the first window groove 132, and the metal pin 74 is located in the second window groove 131. The contact surface between the plastic bracket 72 and the first window groove 132 is the first contact surface 122, and the contact surface between the metal pin 74 and the second window groove 131 is the second contact surface 121; the shape of the first window groove 132 is formed by increasing the periphery of the first contact surface 122 by no more than 0.05 mm, and the shape of the second window groove 131 is formed by increasing the periphery of the second contact surface 121 by no more than 0.1 mm. The shape of the window groove is formed by increasing the periphery of the side-emitting LED 70 by no more than 0.05 mm, which can control the SMT displacement of the side-emitting LED 70 within the range of ±0.05 mm, thereby improving the precision. The flexible printed circuit board 60 accurately arranges the position of the side-emitting LED 70 through the window, thereby improving the lighting effect of the light source module.

[0039] Figure 5A schematic diagram of the structure of the connector in an embodiment of the present invention is shown, the light source module has a connector 140, the connector 140 is arranged on the flexible printed circuit board 60, the connector 140 has a plurality of positive pins (i.e., more than one positive pin) and a plurality of negative pins (i.e., more than one negative pin), the positive poles of the side-emitting LEDs in the plurality of the side-emitting LEDs 70 can be connected in parallel to the positive pins of the connector 140, and the negative poles of the side-emitting LEDs in the plurality of the side-emitting LEDs can be connected in parallel to the negative pins of the connector 140.

[0040] Specifically, the connector 140 is arranged in the direction of light emission of the side-emitting LED 70, and a connecting groove is provided on the flexible printed circuit board 60. The connector 140 is located in the connecting groove. The solder pins of the connector 140 are on the copper layer on the surface of the flexible printed circuit board 60 and are connected to the flexible printed circuit board 60 through solder paste. The remaining part of the connector 140 is sunken into the interior and bottom of the flexible printed circuit board 60, thereby reducing the shielding of the side-emitting LED 70 by the connector 140 and reducing the thickness of the light source module.

[0041] It should be noted that the thickness of the light source module is less than 5.5 mm. The thickness of the light source module is obtained by adding the protruding height of the connector 140, the thickness of the flexible printed circuit board 60 and the height of the side-emitting LED 70, which can reduce the thickness of the display.

[0042] It should be noted that one positive pin in the connector can be electrically connected to the positive pole of a corresponding side-emitting LED, and one positive pin in the connector can also be electrically connected to the positive poles of more than two side-emitting LEDs; one negative pin in the connector can be electrically connected to the negative pole of a corresponding side-emitting LED, and one negative pin in the connector can also be electrically connected to the negative poles of more than two side-emitting LEDs, and the connector can also be electrically connected to the negative poles of all the side-emitting LEDs through one or two negative pins.

[0043] In the specific implementation process, the circuit of the flexible printed circuit board is a circuit in which several side-emitting LEDs are electrically connected to the connector. The cathode of the several side-emitting LEDs 70 is connected to the cathode pin of the connector 140. The anode of any one of the several side-emitting LEDs 70 can be individually connected to the corresponding anode pin of the connector 140, and connected to the corresponding pin of the connector 140 in parallel. Based on the connector 140, each side-emitting LED 70 can be individually controlled, and local dimming (regional dimming or regional control) can be achieved by adjusting the circuit of each side-emitting LED 70.

[0044] It should be noted that the mainboard control IC controls the side-emitting LED 70 by connecting the connector 140. One or more connectors 140 may be provided here, and they are provided according to the control requirements of the mainboard control IC. The number of pins of the connector 140 may also be increased according to the circuit control requirements to achieve refined control of the side-emitting LED.

[0045] In addition to realizing individual control of the side-emitting LED 70, in order to reduce costs, the positive poles of more than two side-emitting LEDs 70 among the several side-emitting LEDs 70 can be connected in parallel to a positive pole pin corresponding to the connector 140, thereby reducing the number of individual control pins and saving the cost of the connector 140 and the cost of the mainboard control IC.

[0046] The light source module adopts the flexible printed circuit board 60 so that the light bar can be naturally bent based on the elastic deformation of the flexible printed circuit board. Displays of the same scale but different curvatures can share the same light bar, which can be applicable to displays of various curvatures, thereby improving versatility. A window is opened on the flexible printed circuit board 60 to improve the installation accuracy of the side-emitting LED 70 and improve the compactness of the light source module.

[0047] The light source module uses a plurality of the side-emitting LEDs assembled on the flexible printed circuit board. Compared with the original light source module, it has the advantages of a large circuit board width, a large line width, and a small line resistance. While satisfying the advantage of a large circuit board width, a complex circuit can be involved on the flexible printed circuit board, thereby realizing the control of a single side-emitting LED. The light source module uses a plurality of side-emitting LEDs assembled on a flexible printed circuit board, which relaxes the width restriction of the backlight circuit board, improves the heat dissipation performance of the circuit board, and can realize the partition control of the side-emitting LED.

[0048] Figure 6 FIG. 1 shows a partial structural diagram of a backlight display module in an embodiment of the present invention. Figure 7The cross-sectional structure diagram of the backlight display module in the embodiment of the present invention is shown. The backlight display module involved in this embodiment includes a light source module, a reflective paper 30, a light guide plate 40, an optical film group 50 and a liquid crystal panel 80. The structure diagram of the light source module Figures 1 to 5 As shown in , wherein: the reflective paper is arranged above the flexible printed circuit board 60, the light guide plate 40 is arranged above the reflective paper 30, and the light guide plate is arranged on the light-emitting surface of the plurality of side-emitting LEDs, the optical film group 50 is arranged above the light guide plate 40, and the liquid crystal panel 80 is arranged above the optical film group. The reflective paper 30, the light guide plate 40, the optical film group 50, and the liquid crystal panel 80 are arranged in parallel; the flexible printed circuit board 60 of the light source module is in parallel with the light guide plate 40, and the plurality of side-emitting LEDs 70 are arranged side by side above one end of the flexible printed circuit board 60, that is, the plurality of side-emitting LEDs 70 of the light source module are arranged at the side end of the light guide plate 40. The side-emitting LEDs 70 are arranged at the side end of the backlight display module, and the emitted light is evenly scattered onto the liquid crystal panel 80 through the light guide plate 40 and the optical film group 50. The reflective paper 30 reflects the light emitted by the side-emitting LED 70 to increase the brightness of the side-emitting LED 70 .

[0049] The backlight display module also includes a back plate 10, a support frame 90 and an outer frame 100, wherein: the back plate 10 is connected to one end of the outer frame 100, the support frame 90 is connected to the outer frame 100, and the support frame 90 is arranged between the back plate 10 and the outer frame 100. The support frame 90 is fixed to the outer frame 100 by screws, and the support frame 90 positions the liquid crystal panel 80, and supports the light guide plate 40 at the same time, so that the light guide plate 40 and the light-emitting surface of the side-emitting LED 70 form a certain mixing light spacing. The outer frame 100 and the back plate 10 encapsulate the liquid crystal panel 80, the light source module, the reflective paper 30, the light guide plate 40, the optical film group 50, etc. to form a backlight display module. The outer frame 100 has a buckle, which is fixedly connected to the back plate 10 through the buckle to protect the structure of the module and improve the overall stability.

[0050] It should be noted that the liquid crystal panel 80 is arranged between the outer frame 100 and the support frame 90, and the light source module, the reflective paper 30, the light guide plate 40 and the optical film group 50 are arranged between the support frame 90 and the back plate 10. The flexible printed circuit board 60 of the light source module is fixedly connected to the back plate 10 by locally setting a thermal conductive double-sided adhesive 20, and the back plate 10 can be a fully enclosed back plate or a back plate with a frame structure. When a fully enclosed back plate structure is adopted, the heat generated by the side-emitting LED 70 needs to be transferred to the fully enclosed back plate through the flexible printed circuit board 60 and the thermal conductive double-sided adhesive 20, and the fully enclosed back plate finally dissipates the heat.

[0051] Figure 6 and Figure 7 The backplane 10 shown in the figure is a backplane with a frame structure. The flexible printed circuit board 60 extends to the entire back side of the backlight display module. The heat dissipation function of the backplane is replaced by the flexible printed circuit board 60. In order to improve the heat dissipation capacity, the width of the flexible printed circuit board 60 can be increased accordingly. This design increases the transfer path of the heat generated by the side-emitting LED 70. Originally, the heat needed to be transferred to the fully enclosed backplane through the thermally conductive double-sided tape. The thermal conductivity of the thermally conductive double-sided tape is low and the thermal conductivity is weak. Now the heat is directly transferred to the flexible printed circuit board 60, and the heat is dissipated through the entire flexible printed circuit board 60, thereby improving the heat dissipation efficiency.

[0052] The support frame 90 includes a first support frame 92 and a second support frame 94 . The first support frame 92 and the second support frame 94 are used to position two ends of the liquid crystal panel 80 .

[0053] The light source module of the backlight display module adopts the side-emitting LED 70 device, and changes the backlight circuit board that is perpendicular to the display screen to be parallel to the display screen, thereby relaxing the restriction on the width of the backlight circuit board, improving the heat dissipation performance of the circuit board, and realizing more zoned control of the side-emitting LED 70.

[0054] In addition, the embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A light source module, characterized in that: The light source module includes a flexible printed circuit board and a plurality of side-emitting LEDs, wherein the flexible printed circuit board is a single-layer aluminum substrate with elastic deformation capability, wherein: The flexible printed circuit board is extended along the central axis, the plurality of side-emitting LEDs are sequentially arranged along the central axis and bonded to the flexible printed circuit board, and the light-emitting surface of any one of the plurality of side-emitting LEDs is perpendicular to the bonding surface of the flexible printed circuit board; The flexible printed circuit board has a window groove, and any one of the plurality of side-emitting LEDs is located in the window groove; The flexible printed circuit board comprises an insulating layer, a copper layer, a solder resist layer and a bottom layer, wherein the insulating layer is arranged on the bottom layer, the copper layer is arranged on the insulating layer, and the solder resist layer is arranged on the copper layer; Any one of the plurality of side-emitting LEDs has a plastic bracket and a metal pin, and the metal pin is embedded in the plastic bracket; The window opening groove comprises a first window opening groove and a second window opening groove, the plastic bracket is located in the first window opening groove, and the metal pin is located in the second window opening groove; The plastic bracket contacts the insulating layer of the flexible printed circuit board through the first window groove, and the metal pin is soldered on the copper layer of the flexible printed circuit board through solder paste.

2. The light source module according to claim 1, characterized in that: The contact surface between the plastic bracket and the first window groove is a first contact surface, and the contact surface between the metal pin and the second window groove is a second contact surface; The shape of the first window groove is formed by increasing the periphery of the first contact surface by no more than 0.05 mm; The shape of the second window groove is formed by increasing the periphery of the second contact surface by no more than 0.1 mm.

3. The light source module according to claim 1, characterized in that: The light source module has a connector, which is arranged on a flexible printed circuit board. The connector has one or more positive pins and one or more negative pins. The positive poles of the side-emitting LEDs among the several side-emitting LEDs are connected in parallel to the positive pins of the connector, and the negative poles of the side-emitting LEDs among the several side-emitting LEDs are connected in parallel to the negative pins of the connector.

4. The light source module according to claim 3, characterized in that: The flexible printed circuit board is provided with a connecting groove, and the connector is located in the connecting groove.

5. The light source module according to claim 3, characterized in that: A positive pin of the connector is electrically connected to the positive poles of more than one side-emitting LED; a negative pin of the connector is electrically connected to the negative poles of more than one side-emitting LED.

6. A backlight display module, characterized in that: The backlight display module comprises the light source module, reflective paper, light guide plate and optical film group according to any one of claims 1 to 5, wherein: The reflective paper is arranged above the flexible printed circuit board; The light guide plate is arranged above the reflective paper, and the light guide plate is arranged on the light emitting surface of the plurality of side-emitting LEDs; The optical film group is arranged above the light guide plate.

7. The backlight display module according to claim 6, wherein: The backlight display module also includes: an outer frame, a back plate, a liquid crystal panel and a thermally conductive double-sided adhesive. The thermally conductive double-sided adhesive is located at the bottom of the light source module, and the position of the thermally conductive double-sided adhesive corresponds to the plurality of side-emitting LEDs. The liquid crystal panel is located above the optical film group. The outer frame and the back plate encapsulate the liquid crystal panel, the light source module, the reflective paper, the light guide plate, the optical film group and the thermally conductive double-sided adhesive to form a backlight display module.

8. The backlight display module according to claim 7, wherein: The backplane is a fully enclosed backplane or a backplane with a frame structure.

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