Local dimming backlight source

Abstract

The utility model discloses a local dimming backlight source which comprises a backlight source structural member and an FPC contained in the backlight source structural member, a lamp panel area is arranged on the side, away from the backlight source structural member, of the FPC, a plurality of LED lamp beads are bound on the lamp panel area, a control circuit component is arranged on the FPC, and the control circuit component is connected with the backlight source structural member. The control circuit component and the LED lamp beads are located on the same side of the FPC, the LED lamp beads are electrically connected with the control circuit component, and one end, provided with the control circuit component, of the FPC is bent to the back face of the backlight source structural part to be connected with a client mainboard. The backlight source has the advantages that the lamp panel area and the control circuit components are integrated on one FPC, an existing PCB double-layer board or glass base material bridging wiring mode is replaced, and the manufacturing cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED backlight, in particular to a local dimming backlight source. Background Art

[0002] Local dimming means local backlight adjustment. It uses a backlight composed of hundreds of LEDs instead of CCFL backlight. The backlight LED can be adjusted according to the brightness of the image. The brightness of the highlighted part of the display image can reach the maximum, while the dark part can reduce the brightness or even turn off to achieve the best contrast.

[0003] Most existing local dimming structure designs use double-layer PCB or glass substrate bridge routing methods, which have relatively high process and material costs, and also have the problem of complex processing. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a local dimming backlight source.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A local dimming backlight source comprises: a backlight source structure and an FPC accommodated in the backlight source structure, wherein the side of the FPC away from the backlight source structure is a light board area, a plurality of LED lamp beads are bound to the light board area, a control circuit component is arranged on the FPC, the control circuit component and the plurality of LED lamp beads are located on the same side of the FPC, the plurality of LED lamp beads are electrically connected to the control circuit component, and one end of the FPC with the control circuit component is bent to the back side of the backlight source structure and connected to the customer's mainboard.

[0007] In one of the embodiments, an LED binding area is provided on the light board area, a double-layer wiring is provided on the LED binding area, a plurality of LED lamp beads are bound to the LED binding area, and a plurality of LED lamp beads are located on the double-layer wiring, a plurality of LED lamp beads are electrically connected to the double-layer wiring, and the double-layer wiring is electrically connected to the control circuit components.

[0008] In one embodiment, white ink is silk-screened on the LED binding area, and the entire surface of the white ink is silk-screened on the LED binding area. The white ink is provided with a space to avoid the binding positions of the plurality of LED lamp beads.

[0009] In one embodiment, the thickness of the white ink is 20um-100um.

[0010] In one embodiment, a plug-in terminal is disposed at the upper end of the FPC, the control circuit components are disposed on a side of the plug-in terminal away from the backlight source structure, and the plug-in terminal is used to connect to a customer mainboard.

[0011] In one embodiment, a through hole is formed on the backlight structure, and the through hole is located near the plug-in end of the backlight structure. The plug-in end is bent and passes through the through hole to the back side of the backlight structure to connect with the customer mainboard.

[0012] In one embodiment, a reinforcing plate for providing hardness support is disposed on a side of the FPC away from the light board area. The reinforcing plate is disposed relative to the light board area, and the thickness of the reinforcing plate is 0.2 mm-0.5 mm.

[0013] In one embodiment, the reinforcing plate is also provided on a side of the plug-in end facing the backlight source structure, and the reinforcing plate is arranged relative to the position of the control circuit components.

[0014] In one embodiment, a conductive double-sided adhesive is provided between the FPC and the backlight structure for bonding and fixing, and the FPC and the backlight structure are grounded through the conductive double-sided adhesive.

[0015] In one embodiment, an optical film is disposed on the front surface of the backlight source structure, and the optical film is located on a side of the FPC away from the backlight source structure.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] A local dimming backlight source of the utility model is achieved by arranging a light board area and control circuit components on the same side of an FPC, with a plurality of LED lamp beads bound to the light board area, and the plurality of LED lamp beads are all connected to the control circuit components. The light board area and the control circuit components are an integrated structure of the FPC, integrated together through a piece of FPC panel, and connected to the customer's main board by bending the plug-in end to the back side of the backlight source structure, so as to replace the existing PCB double-layer board or glass substrate bridge wiring method, thereby saving manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0019] Figure 1A schematic diagram of the structure of an FPC in a local dimming backlight source provided by the utility model;

[0020] Figure 2 A schematic diagram of the structure of a local dimming backlight source provided by the utility model;

[0021] Figure 3 The utility model provides a schematic diagram of the structure of a local dimming backlight source with a bent plug-in end.

[0022] Description of the drawings: 10, backlight structure; 11, perforation; 20, FPC; 21, light board area; 211, LED binding area; 22, plug-in terminal; 221, control circuit components; 30, double-layer wiring; 40, LED lamp beads; 50, white ink; 60, reinforcement plate; 70, conductive double-sided adhesive; 80, optical film. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0024] A local dimming backlight, see Figure 1 and Figure 2 , including a backlight structure 10 and an FPC 20 accommodated in the backlight structure 10, the backlight structure 10 is arranged in a concave shape so that the FPC 20 can be accommodated in the backlight structure 10. The backlight structure 10 is made of metal.

[0025] Reference Figure 1 and Figure 2 The side of the FPC 20 away from the backlight structure 10 is the light board area 21, and the light board area 21 is provided with an LED binding area 211, and the LED binding area 211 is provided with a double-layer wiring 30, and the double-layer wiring 30 is formed by copper plating the entire surface of the FPC 20 and making a copper line. A plurality of LED lamp beads 40 are bound to the LED binding area 211, and the plurality of LED lamp beads 40 are evenly distributed on the LED binding area 211, and the plurality of LED lamp beads 40 are located on the double-layer wiring 30, and the plurality of LED lamp beads 40 are electrically connected to the double-layer wiring 30. A solid crystal sealant for fixing the position of the LED lamp beads 40 is provided on the plurality of LED lamp beads 40.

[0026] Reference Figure 1 and Figure 2 , white ink 50 is screen-printed on the LED binding area 211. The white ink 50 is screen-printed on the entire surface of the LED binding area 211, and the white ink 50 is provided with a space-avoiding position relative to the binding positions of the multiple LED lamp beads 40. The white ink 50 is used to increase the reflection of light and improve the utilization rate of light.

[0027] Further, refer to Figure 1 and Figure 2 The thickness of the white ink 50 is 20um-100um. The white ink 50 is used to protect the wiring of the LED lamp beads 40 and improve the reflection of light.

[0028] Reference Figure 1 and Figure 2 , a plug-in terminal 22 is provided at the upper end of the FPC20, and a control circuit component 221 is provided on the side of the plug-in terminal 22 of the FPC20 away from the backlight structure 10. The control circuit component 221 and the multiple LED lamp beads 40 and the double-layer wiring 30 are located on the same side of the FPC20. The control circuits of the multiple LED lamp beads 40 are connected to the double-layer wiring 30 on the FPC20, and the double-layer wiring 30 is electrically connected to the control circuit component 221, so that the control circuit component 221 is connected to the control circuits of the multiple LED lamp beads 40. By optimizing the wiring of the control circuits of the multiple LED lamp beads 40, the minimum partition is achieved as one LED lamp bead 40, and the brightness of one LED lamp bead 40 can be controlled individually.

[0029] Reference Figure 2 A reinforcing plate 60 is provided on the side of the FPC 20 away from the light board area 21. The reinforcing plate 60 is arranged relative to the light board area 21. The thickness of the reinforcing plate 60 is 0.2mm-0.5mm. The reinforcing plate 60 provides hardness support for the FPC 20. The reinforcing plate 60 is a steel plate. The steel plate is conductive and can conduct static electricity in the FPC 20.

[0030] Further, refer to Figure 2 A reinforcing plate 60 is also provided on the side of the FPC 20 plug-in end 22 facing the backlight structure 10 , and the reinforcing plate 60 is arranged relative to the position of the control circuit component 221 .

[0031] Reference Figure 2 and Figure 3 A conductive double-sided adhesive 70 for bonding and fixing is provided between FPC20 and the backlight structure 10. The conductive double-sided adhesive 70 fixes FPC20 and the backlight structure 10, and enables FPC20 and the backlight structure 10 to be grounded, thereby strengthening the protection of multiple LED lamp beads 40.

[0032] Reference Figure 2 and Figure 3The backlight structure 10 is provided with a through hole 11, and the through hole 11 is located at the backlight structure 10 near the plug-in end 22 of the FPC20. Since the plug-in end 22 of the FPC20 is located outside the backlight structure 10, the plug-in end 22 of the FPC20 needs to be bent to the back of the backlight structure 10, so the backlight structure 10 is provided with a through hole 11 at the bending position relative to the FPC20. The FPC20 is a flexible circuit board, and the plug-in end 22 of the FPC20 is bent at the position with the control circuit component 221 and passes through the through hole 11 to reach the back of the backlight structure 10. After the plug-in end 22 of the FPC20 is bent to the backlight structure 10, it is connected to the customer's mainboard.

[0033] Reference Figure 2 and Figure 3 The front of the backlight structure 10 is provided with an optical film 80, and the optical film 80 is located on the side of the FPC 20 away from the backlight structure 10. The optical film 80 can be a diffusion film or a brightness enhancement film.

[0034] Reference Figure 2 and Figure 3 By arranging the light board area 21 and the control circuit components 221 on the same side of the FPC20, a plurality of LED lamp beads 40 are bound to the light board area 21, and the plurality of LED lamp beads 40 are connected to the control circuit components 221. The light board area 21 and the control circuit components 221 are an integrated structure of the FPC20, integrated together through a piece of FPC20 panel, and bent to the back of the backlight source structure 10 through the plug-in end 22 to be connected to the customer's main board, so as to replace the existing PCB double-layer board or glass substrate bridge wiring method, thereby saving manufacturing costs.

[0035] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A local dimming backlight source, characterized in that: include: A backlight structure (10) and an FPC (20) accommodated in the backlight structure (10); a side of the FPC (20) away from the backlight structure (10) is a light board area (21); a plurality of LED lamp beads (40) are bound to the light board area (21); a control circuit component (221) is arranged on the FPC (20); the control circuit component (221) and the plurality of LED lamp beads (40) are located on the same side of the FPC (20); the plurality of LED lamp beads (40) are electrically connected to the control circuit component (221); and one end of the FPC (20) carrying the control circuit component (221) is bent to the back side of the backlight structure (10) and connected to a customer's mainboard.

2. A local dimming backlight source according to claim 1, characterized in that: An LED binding area (211) is provided on the lamp board area (21), a double-layer wiring (30) is provided on the LED binding area (211), a plurality of LED lamp beads (40) are bound to the LED binding area (211), and a plurality of LED lamp beads (40) are located on the double-layer wiring (30), a plurality of LED lamp beads (40) are electrically connected to the double-layer wiring (30), and the double-layer wiring (30) is electrically connected to the control circuit component (221).

3. A local dimming backlight source according to claim 2, characterized in that: White ink (50) is screen-printed on the LED binding area (211); the white ink (50) is screen-printed on the entire surface of the LED binding area (211); and a clearance position is provided for the white ink (50) relative to the binding positions of the plurality of LED lamp beads (40).

4. A local dimming backlight source according to claim 3, characterized in that: The thickness of the white ink (50) is 20um-100um.

5. A local dimming backlight source according to claim 4, characterized in that: The upper end of the FPC (20) is provided with a plug-in terminal (22), the control circuit component (221) is arranged on a side of the plug-in terminal (22) away from the backlight source structure (10), and the plug-in terminal (22) is used to connect to a customer's mainboard.

6. The local dimming backlight source according to claim 5, characterized in that: The backlight source structure (10) is provided with a through hole (11), the through hole (11) is located at a position of the backlight source structure (10) close to the plug-in end (22), and the plug-in end (22) is bent and passes through the through hole (11) to the back side of the backlight source structure (10) to be connected to the customer's mainboard.

7. The local dimming backlight source according to claim 6, characterized in that: A reinforcing plate (60) for providing hardness support is arranged on a side of the FPC (20) away from the light board area (21); the reinforcing plate (60) is arranged relative to the position of the light board area (21); and the thickness of the reinforcing plate (60) is 0.2 mm-0.5 mm.

8. The local dimming backlight source according to claim 7, characterized in that: The reinforcing plate (60) is also provided on the side of the plug-in end (22) facing the backlight source structure (10), and the reinforcing plate (60) is arranged relative to the position of the control circuit component (221).

9. The local dimming backlight source according to claim 1, characterized in that: A conductive double-sided adhesive (70) for bonding and fixing is provided between the FPC (20) and the backlight source structure (10), and the FPC (20) and the backlight source structure (10) are grounded via the conductive double-sided adhesive (70).

10. The local dimming backlight source according to claim 1, characterized in that: An optical film (80) is arranged on the front surface of the backlight source structure (10), and the optical film (80) is located on a side of the FPC (20) away from the backlight source structure (10).

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