CN103672537B - A kind of LED lamp bar, backlight source module and display unit - Google Patents

Abstract

The embodiment of the present invention provides a kind of LED lamp bar, backlight source module and display unit, relates to Display Technique field, avoid Hot? Spot phenomenon, improves the quality of display unit display frame; This LED lamp bar comprises wiring board, is arranged on the multiple LED chips on described wiring board; Further comprise the light disperser being arranged on described wiring board, described smooth disperser is for spreading the light that described multiple LED chip sends. For avoiding Hot? backlight source module, the display unit etc. of Spot phenomenon.

Description

LED light bar, backlight module and display device

technical field

The invention relates to the field of display technology, in particular to an LED light bar, a backlight source module and a display device.

Background technique

At present, the backlight module is generally composed of a light source, a light guide plate, an optical film, etc., among which light-emitting diodes (Light Emitting Diode, referred to as LED) have the advantages of small size, low power consumption, and long service life, and are widely used as light sources.

However, as shown in FIG. 1, since the LED chip 102 is a point-shaped light emitter, its light-emitting angle is about 120°, and the light-emitting range is similar to a fan. Due to the existence of the above viewing angle, there will be a blind area of light emission. In this case, if the distance between the light guide plate 202 and the LED chip 102 is very short, no light passes through the area of the light guide plate 202 corresponding to the blind area, and thus a HotSpot (ie, "firefly") phenomenon occurs. If the distance between the light guide plate 202 and the LED chip 102 is increased, although the HotSpot phenomenon can be eliminated, the viewing angle range of the LED chip 102 will be reduced and the utilization rate of light will be reduced.

Contents of the invention

Embodiments of the present invention provide an LED light bar, a backlight module, and a display device, which can avoid the HotSpot phenomenon and improve the quality of the display screen of the display device.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

On the one hand, an embodiment of the present invention provides an LED light bar, the LED light bar includes a circuit board, a plurality of LED chips arranged on the circuit board; further includes a light diffusion device arranged on the circuit board , the light diffusing device is used for diffusing the light emitted by the plurality of LED chips.

Optionally, the light diffusion device at least includes a light-transmitting surface parallel to the circuit board, and fine dots located on the side surface of the light-transmitting surface opposite to the circuit board; wherein, the plurality of LED chips are located on Between the circuit board and the light-transmitting surface.

Further optionally, the side of the fine dots opposite to the circuit board is convex.

Optionally, the light diffusion device further includes a first side perpendicular to the light-transmitting surface, and the first side is located at the outermost side of the plurality of LED chips; wherein, the light-transmitting surface and the light-transmitting surface The first side is an integrated structure.

Further optionally, the LED light bar further includes a reflective layer, and the reflective layer is disposed on a surface of the first side facing the side of the LED chip.

Further optionally, the first side extends beyond the light-transmitting surface; the reflective layer is further disposed on a portion of the first side extending beyond the light-transmitting surface.

Optionally, the light diffusion device further includes a second side parallel to the first side; wherein, the plurality of LED chips are located on the light-transmitting surface, the first side, the second side, And in the space enclosed by the circuit board; the reflective layer is also arranged on the surface of the second side facing the side of the LED chip.

On the other hand, an embodiment of the present invention provides a backlight module, including the above-mentioned LED light bar.

Optionally, the backlight module further includes a light guide plate; the LED light bar is arranged on a light incident side of the light guide plate.

In yet another aspect, an embodiment of the present invention provides a display device, including the above-mentioned backlight module.

An embodiment of the present invention provides an LED light bar, a backlight module, and a display device. The LED light bar includes a circuit board, a plurality of LED chips arranged on the circuit board, and a plurality of LED chips arranged on the circuit board. A light diffusion device, the light diffusion device is used to diffuse the light emitted by the plurality of LED chips; compared with the blind area between any two LED chips in the prior art due to the existence of their 120° light-emitting viewing angle, the present invention In the embodiment of the invention, by setting the light diffusion device, the light emitted from all the LED chips on the LED light bar is diffused, thereby making the light emitted from the LED light bar uniform, so that when the LED light bar is applied to the backlight module When combined, it can avoid that no light passes through some areas of the light guide plate, thereby avoiding the HotSpot phenomenon, and further improving the quality of the display image of the display device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

1 is a schematic diagram of the range of light emitted by LED chips in the prior art;

Fig. 2a is a three-dimensional schematic diagram 1 of an LED light bar provided by an embodiment of the present invention;

Fig. 2b is a schematic side view of the LED light bar shown in Fig. 2a;

Fig. 3a is a perspective view II of an LED light bar provided by an embodiment of the present invention;

Fig. 3b is a schematic side view of the LED light bar shown in Fig. 3a;

Fig. 4 is a side view schematic diagram 1 of an LED light bar provided by an embodiment of the present invention;

Fig. 5 is a three-dimensional schematic diagram of an LED light bar provided by an embodiment of the present invention;

Fig. 6 is a schematic side view II of an LED light bar provided by an embodiment of the present invention;

FIG. 7 is a first structural schematic diagram of a backlight module provided by an embodiment of the present invention;

FIG. 8 is a second structural schematic diagram of the backlight module provided by the embodiment of the present invention.

Reference signs:

10-LED light bar; 20-backlight module; 101-circuit board; 102-LED chip; 103-light diffusion device; Side; 104-reflection layer; 201-bottom plate; 202-light guide plate; 203-optical film; 204-emission sheet.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention provides an LED light bar 10, as shown in Figure 2 to Figure 6, the LED light bar 10 includes a circuit board 101, a plurality of LED chips 102 arranged on the circuit board; The light diffusion device 103 on the circuit board 101 is used for diffusing the light emitted by the plurality of LED chips.

Wherein, the plurality of LED chips 102 are preferably arranged in a "one" shape.

It should be noted that, firstly, the embodiment of the present invention does not limit the light diffusing device 103, so as to receive the light emitted by all LED chips 102 and diffuse the light, so that the light emitted from the LED light bar 10 Light homogenization prevails.

In addition, the way of fixing the circuit board 101 and the light diffusion device 103 is not limited, as long as the circuit board 101 and the light diffusion device 103 do not move between each other.

Second, since the function of the LED light bar 10 is to emit light, those skilled in the art should understand that when the light diffusion device 103 includes a part arranged on the light-emitting surface of the LED chip 102, the material of this part should be For transparent material.

Wherein, the transparent material is not further limited in the embodiment of the present invention, and a transparent material with a high light transmittance can be preferably selected according to the actual situation.

Thirdly, the circuit board 101 is electrically connected to the LED chip 102, and its function is to drive the LED chip 102 to emit light. Wherein, the circuit board 101 may be, for example, a printed circuit board (Printed circuit board, referred to as PCB) or a flexible circuit board (Flexible Printed Circuit, referred to as FPC).

The embodiment of the present invention provides an LED light bar 10, the LED light bar includes a circuit board 101, a plurality of LED chips 102 arranged on the circuit board 101, and a light diffusion device arranged on the circuit board 101 103, the light diffusing device 103 is used to diffuse the light emitted by the plurality of LED chips 102; compared to any two LED chips 102 in the prior art, due to the existence of a 120° luminous viewing angle, there is a luminous blind area, In the embodiment of the present invention, by setting the light diffusion device 103, the light emitted from all the LED chips 102 on the LED light bar 10 is diffused, so that the light emitted from the LED light bar 10 is uniform, so that when the LED light bar 10 When applied to a backlight module, it is possible to prevent no light from passing through some areas of the light guide plate, thereby avoiding the HotSpot phenomenon, thereby improving the quality of the display screen of the display device.

Optionally, as shown in FIGS. 2-6 , the light diffusion device 103 at least includes a light-transmitting surface 1031 parallel to the circuit board 101 , and a light-transmitting surface 1031 located on the side of the light-transmitting surface 1031 opposite to the circuit board 101 . Fine dots 1032 on the surface; wherein, the plurality of LED chips 102 are located between the circuit board 101 and the light-transmitting surface 1031 .

Here, the fine grid dots 1032 can be prepared by printing, and their function is to diffuse light, that is, the light emitted from the LED chip 102 is diffused by the fine grid dots 1032 after being incident on the fine grid dots 1032, so that the The light emitted by the light-transmitting surface 1031 of the LED light bar 10 is uniform.

Further optionally, the side of the fine dots 1032 opposite to the circuit board 101 is convex.

In this way, when the light emitted from the LED chip 102 is incident on the convex surface of the fine dots 1032, light scattering can occur.

Further optionally, as shown in FIGS. 2a and 3a, the light diffusion device 103 may further include a first side 1033 perpendicular to the light-transmitting surface 1031, and the first side 1033 is located on the side of the plurality of LED chips. 102; wherein, the transparent surface 1031 and the first side 1033 are an integrated structure.

In this way, the first side 1033 can be fixed to the circuit board 101 , so that the light diffusion device 103 is not easy to move relative to the circuit board 101 .

It should be noted that the first side 1033 is not limited here, and it can be any side between the circuit board 101 and the light-transmitting surface 1031, as long as the light-transmitting surface 1031 can be fixed. Can.

On this basis, as shown in FIGS. 2 b and 3 b , a reflective layer 104 is provided on the surface of the first side 1033 facing the LED chip 102 . In this way, the light incident on the reflective layer 104 can be reflected to the light-transmitting surface 1031 to improve the light utilization rate.

Here, when the LED light bar 10 is applied to a backlight module and is a side-entry type, it is considered that the backlight module also includes a metal backplane, and generally the metal backplane includes a bottom plate and a side plate, and The metal backplane is opaque, and no light leakage will occur. Therefore, there is no need to consider the light leakage between the circuit board 101 and the light-transmitting surface 1031 near the sides of the side plate and the bottom plate, but for the light of the backlight module The side close to the exit surface needs to be considered. Therefore, the first side 1033 can be set to be parallel to the bottom plate of the backlight module and far away from the bottom plate. In this way, since the surface of the first side 1033 is provided with a reflective layer 104, the occurrence of light leakage can be avoided.

Further, as shown in FIG. 4 , the first side 1033 may extend beyond the transparent surface 1031 . In this case, the reflective layer 104 also extends along the first side 1033 .

In this way, when the LED light bar 10 is applied to a backlight module and is of the side-entry type, the length of the portion of the first side 1033 beyond the light-transmitting surface 1031 can be reasonably set, so that the portion located beyond the light-transmitting surface The reflective layer 104 on the surface of the first side 1033 of the surface 1031 blocks the light emitted from the light-transmitting surface 1031 from directly emitting to avoid light leakage. On this basis, this part of light can also be reflected to the guide of the backlight module. Light panels, thereby further improving the utilization of light.

Based on the above description, as shown in FIGS. 5 and 6 , the light diffusion device 103 further includes a second side 1034 parallel to the first side.

Wherein, the plurality of LED chips 102 are located in the space surrounded by the light-transmitting surface 1031, the first side 1033, the second side 1034, and the circuit board 101; the reflective layer 104 is also arranged on The second side 1034 is on a surface facing the side of the LED chip 102 .

On the one hand, the light-transmitting surface 1031 can be made more stable by setting the second side 1034 , and on the other hand, the reflective layer 104 is also set on the surface of the second side 1034 , which can further improve the utilization rate of light.

On this basis, the lengths of the first side 1033 and the second side 1034 beyond the light-transmitting surface 1031 can also be reasonably set, so that the first side 1033 and the second side 1034 located beyond the light-transmitting surface 1031 The reflective layer 104 on the surface of the second side surface 1034 blocks the light emitted from the light-transmitting surface 1031 from directly emitting to avoid light leakage.

In addition, in the embodiment of the present invention, the second side 1034 can also be set to be perpendicular to the first side 1033 as required; or the first side 1033 can be set between the circuit board 101 and the transparent surface 1031 In addition to the second side 1034, a third side and a fourth side are also provided, which are specifically set according to actual conditions and are not limited here.

The embodiment of the present invention also provides a backlight module 20 , as shown in FIG. 7 and FIG. 8 , the backlight module includes the above-mentioned LED light bar 10 .

Preferably, the backlight module 20 is a side-type backlight module.

In this case, the backlight module 20 may further include a metal backplane, a light guide plate 202 disposed on the bottom plate 201 of the metal backplane, an optical film 203 disposed above the light guide plate, and a set The reflective sheet 204 and the like under the light guide plate 202 ; wherein, the LED light bar 10 is disposed on the side of the light guide plate 202 .

Here, the relative positional relationship between the light guide plate 202 having different shapes, the LED light bar 10 and the reflective sheet 204 is as follows:

For the case where the light guide plate 202 is flat, as shown in FIG. 7 , the light guide plate 202 and the LED light bar 10 are arranged side by side above the reflection sheet 204 .

For the case where the light guide plate 202 is wedge-shaped, as shown in FIG. The thicker side is set on the side close to the light-transmitting surface 1031, and the other thinner side of the light guide plate 202 is set on the side away from the light-transmitting surface 1031, here, in order to make the The light emitted by the LED light bar 10 into the light guide plate 202 is transformed into a surface light source perpendicular to the base plate 201 of the metal back plate. The inclined surface of the light guide plate 202 is disposed above the reflection sheet 204 , and the shape of the reflection sheet 204 is a wedge-shaped plate fit with the light guide plate 202 .

In addition, the material used for the light guide plate 202 is not limited. The light guide plate 202 may be made of plastic particles such as polycarbonate (PC for short) or polymethylmethacrylate (PMMA for short). Injection-molded flat or wedge-shaped sheet with high light transmission.

A specific embodiment is provided below to describe in detail the structure of the above-mentioned edge-lit backlight module 20 including the LED light bar 10 .

As shown in FIG. 7 , the side-lit backlight module 20 includes: a backplane, the backplane includes a bottom plate 201, a reflective sheet 204 arranged on the bottom plate 201, a reflective sheet arranged on the reflective sheet 204 The flat light guide plate 202 , the LED light bar 10 arranged side by side with the light guide plate 202 and on one side of the light guide plate 202 , and the optical film 203 arranged on the light guide plate 202 .

The LED light bar 10 includes a circuit board 101, a plurality of LED chips 102 arranged on the circuit board 101, and a light diffusing device 103 arranged on the circuit board 101; the light diffusing device 103 includes The light-transmitting surface 1031 parallel to the circuit board 101, the first side 1033 perpendicular to the light-transmitting surface 1031 and parallel to the bottom plate 201, and the surface on the side of the light-transmitting surface 1031 opposite to the circuit board 101 The fine dots 1032 of the LED light bar 10 further include a reflective layer 104 disposed on the side of the first side 1033 opposite to the LED chip 102 .

Wherein, the light-transmitting surface 1031 and the first side 1033 are an integrated structure; into the space.

The first side 1033 is located on the light-emitting side of the light guide plate 202 and the first side 1033 is higher than the light-emitting surface of the light guide plate 202; the first side 1033 extends beyond the light-transmitting surface 1031, The reflective layer 104 extends beyond the transparent surface 1031 .

In this way, by setting the light diffusion device 103, the light emitted from all the LED chips 102 on the LED light bar 10 can be diffused, so that the light emitted from the LED light bar 10 can be uniformed, and partial areas of the light guide plate 202 can be avoided. No light passes through, thereby avoiding the HotSpot phenomenon; in addition, by setting the reflective layer 104, the light incident on the reflective layer 104 can be reflected to the light-transmitting surface 1031 and the light guide plate 202, so as to avoid light leakage and improve light utilization.

An embodiment of the present invention also provides a display device, including the backlight module 20 described in any one of the above.

Since the light emitted by the LED light bar 10 in the backlight module 20 provided above is uniform, it can avoid that no light passes through some areas of the light guide plate, thereby avoiding the HotSpot phenomenon. Therefore, when it is applied to the display When installed, the overall picture quality of the display device can be improved.

The above-mentioned display device may be a liquid crystal display, a liquid crystal TV, a digital photo frame, a mobile phone, a tablet computer, and other products or components with any display function.

It should be noted that all the drawings of the present invention are simplified schematic diagrams of the LED light bar 10 and the backlight module 20, which are only for clearly describing the structure related to the invention, and for other inventions The point-independent structure is an existing structure, which is not shown or only partly shown in the drawings.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. a LED lamp bar, comprises wiring board, is arranged on the multiple LED chips on described wiring board; It is characterized in that, also comprise the light disperser being arranged on described wiring board, described smooth disperser is for spreading the light that described multiple LED chip sends;

Described smooth disperser at least comprises the transparent surface parallel with described wiring board and is positioned at the tiny site of relative described wiring board one side surface of described transparent surface;

Wherein, described multiple LED chip is between described wiring board and described transparent surface;

Described smooth disperser also comprises first side vertical with described transparent surface, and described the first side is positioned at the outermost of described multiple LED chips;

Described transparent surface and described the first side are integrated;

Described LED lamp bar also comprises reflecting layer, and described reflecting layer is arranged on described the first side on the surface of LED chip one side;

Described the first side is extended and is exceeded described transparent surface;

Described reflecting layer is also arranged on described the first side extends and exceedes the part of described transparent surface.

2. LED lamp bar according to claim 1, is characterized in that, the one side of the relatively described wiring board in described tiny site is convex surface.

3. LED lamp bar according to claim 1, is characterized in that, described smooth disperser also comprises the second side with described the first parallel sided;

Wherein, described multiple LED chip is positioned at the space that described transparent surface, described the first side, described the second side and described wiring board surround;

Described reflecting layer is also arranged on described the second side on the surface of described LED chip one side.

4. a backlight source module, is characterized in that, comprises at least one LED lamp bar as described in claims 1 to 3 any one.

5. backlight source module according to claim 4, is characterized in that, described backlight source module also comprises LGP;

Described LED lamp bar is arranged on the light incident sides of described LGP.

6. a display unit, is characterized in that, comprises the backlight source module described in claim 4 or 5.