CN104776363A - Backlight module and display device - Google Patents

Abstract

The invention discloses a backlight module and a display device. The backlight module includes: a light guide plate and a light source, and also includes a reflection device, the light exit surface of the reflection device is opposite to the light entrance surface of the light guide plate, and the The light incident surface of the reflection device is opposite to the light source, and is used to reflect the light emitted from the light source into the light incident surface of the light guide plate; wherein, the light source emits light in the thickness direction of the light guide plate. The backlight module changes the light incident mode of the light source through the reflection device, and reflects the light emitted by the light source into the light incident surface of the light guide plate, thereby increasing the light mixing distance between the light emitting surface of the light emitting element and the effective display area of the light guide plate, The light emitted from the light-emitting surface of the light-emitting element is uniformly mixed before entering the effective display area of the display panel, thereby improving the display effect of the display panel.

Description

A kind of backlight module and display device

technical field

The invention relates to the field of display technology, in particular to a backlight module and a display device.

Background technique

Liquid Crystal Display (LCD for short) has become a mainstream product among flat panel display devices due to its small size, low power consumption, and no radiation. The backlight source is an essential device in the liquid crystal display device, and the backlight source is used to provide backlight for the light guide plate during display. In order to adapt to the development of thinner and lighter display panels, the backlight usually adopts a side-type backlight, as shown in Figure 1, the side-type backlight usually installs the light source 4 on the edge of one side of the light guide plate 3, so that the light source 4 emits light. The light from the light guide plate 3 enters the effective display area 7 of the light guide plate 3 from the edge end of the light guide plate 3, wherein the light source generally adopts an LED light bar 2, and a plurality of LED lights 1 are arranged on the LED light bar, and the plurality of LED lights are arranged along the extension of the light bar. The directions are spaced equally from each other.

As shown in Figure 2, since the light irradiation range of each LED lamp 1 is about a fan-shaped area, the light brightness in the fan-shaped area is relatively high, so the fan-shaped area forms the light bright area 11 of the entire LED light bar, and in The space between two LED lamps 1 that are spaced apart from each other has low light brightness, so it is easy to form a dark area 12 in the space between two LED lights 1 . When the distance from the effective display area of the light guide plate is not enough for the LED lamp 1 to mix light, it will cause the firefly Hotspot phenomenon on the display panel (multiple bright and dark spots appear on the display panel), which will seriously affect the display effect of the display panel .

Contents of the invention

Aiming at the defects in the prior art, the present invention provides a backlight module and a display device, which prevents the display panel from being damaged due to the fact that the light-emitting surface of the light-emitting element is relatively close to the effective display area of the light guide plate during the design of ultra-narrow bezel products. The phenomenon of uneven brightness and darkness occurs, which improves the display effect of the display panel.

In a first aspect, the present invention provides a backlight module, including: a light guide plate and a light source, and also includes: a reflection device, the light output surface of the reflection device is opposite to the light incident surface of the light guide plate, and the light entrance surface of the reflection device The light surface is opposite to the light source, and is used to reflect the light emitted from the light source into the light incident surface of the light guide plate;

Wherein, the light source emits light in the thickness direction of the light guide plate.

Optionally, the reflection device includes a reflection surface, and an included angle between the reflection surface and the thickness direction of the light guide plate is an acute angle.

Optionally, the reflection device is integrally formed with the light guide plate.

Optionally, the reflecting device is a triangular prism.

Optionally, the cross section of the triangular prism is a right triangle, the first right-angled side corresponds to the light incident surface of the light guide plate, the second right-angled side corresponds to the light-emitting surface of the light guide plate, and the hypotenuse corresponds to the light-emitting surface of the light guide plate. reflective surface.

Optionally, the length of the first right-angled side is less than or equal to the thickness of the light guide plate.

Optionally, the length of the second right-angled side is greater than or equal to the width of the light emitting surface of the light source.

Optionally, a backboard is further included, the backboard includes a recessed part, and the light source is arranged in the recessed part.

Optionally, the light source includes a light bar and a plurality of light emitting elements arranged at equal intervals along the extending direction of the light bar.

In a second aspect, the present invention also provides a display device, comprising the above-mentioned backlight module.

It can be seen from the above technical solution that the backlight module and display device provided by the present invention change the light incident mode of the light emitting element of the light source through the reflection device, and reflect the light emitted by the light emitting element into the light incident surface of the light guide plate, thereby increasing the The light mixing distance between the light-emitting surface of the light-emitting element and the effective display area of the light guide plate makes the light emitted from the light-emitting surface of the light-emitting element uniformly mixed before entering the effective display area of the display panel, thereby improving the display effect of the display panel.

Description of drawings

FIG. 1 is a schematic structural view of a backlight module in the prior art;

FIG. 2 is a schematic diagram of light irradiation of an LED light bar in the prior art;

3 is a schematic structural diagram of a backlight module provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a backlight module provided by another embodiment of the present invention;

Wherein reference sign explanation:

1. Light-emitting element; 2. Light bar; 3. Light guide plate; 4. Light source; 5. Reflecting device; 6. Back panel; 7. Effective display area; 11. Bright light area;

detailed description

The specific embodiments of the invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

Fig. 3 shows a schematic structural view of a backlight module provided by an embodiment of the present invention. As shown in Fig. 3, the backlight module includes: a light guide plate 3, a light source 4 and a reflection device 5, and the light output surface of the reflection device 5 and the light guide plate 3 is opposite to the light incident surface, and the light incident surface of the reflection device 5 is opposite to the light source 4, and is used to reflect the light emitted from the light source 4 into the light incident surface of the light guide plate 3; Direction to emit light.

Specifically, the above-mentioned light source 4 specifically includes a light bar 2 and a plurality of light emitting elements 1 arranged at equal intervals along the extending direction of the light bar 2 (the arrangement is similar to that in FIG. 2 ), wherein the light bar 2 is placed horizontally on the backboard 6 in the depression.

The above-mentioned backlight module changes the light-incoming mode of the light-emitting element through the reflecting device 5, and reflects the light emitted by the light-emitting element 1 in the light source 4 into the light-incident surface of the light guide plate 3, thereby increasing the effective distance from the light-emitting surface of the light-emitting element 1 to the light guide plate. The light mixing distance between the display areas 7 enables the light emitted from the light emitting surface of the light emitting element 1 to mix light evenly before entering the effective display area 7 of the light guide plate 3 , which improves the display effect of the display panel.

In a specific application, the above-mentioned backlight module can use the following two structures to avoid uneven brightness and darkness of the display panel when the light-emitting surface of the light-emitting element 1 is relatively close to the effective display area of the light guide plate when designing ultra-narrow bezel products. Phenomenon.

Fig. 3 shows a schematic structural view of a backlight module provided by an embodiment of the present invention, wherein the reflection device 5 is integrally formed with the light guide plate 3, that is, the light guide plate 3 includes a triangular light guide plate at the light incident surface of the light emitting element 1 structure, wherein the reflective device 5 includes a reflective surface, and the included angle between the reflective surface of the reflective device 5 and the thickness direction of the light guide plate 3 is an acute angle. The projected surface width of the direction parallel to the thickness direction of the light plate 3 is the same as the thickness of the light guide plate 3, and the projected surface width of the direction perpendicular to the thickness direction of the light guide plate 3 is greater than or equal to the width of the light emitting surface of the light emitting element. Thereby reducing the loss of light and improving the utilization rate of light.

The reflecting device 5 in the above structure is integrally formed with the light guide plate 3, which reduces the manufacturing process of the backlight module.

In another practicable manner, the reflection device 5 and the light guide plate 3 are not integral structures. As shown in FIG. On the light incident surface of the light guide plate 3 , the second right-angle side corresponds to the light exit surface of the light guide plate 3 , and the hypotenuse corresponds to the reflective surface of the light guide plate 3 . In order to reflect all the light emitted by the LED lamp 1 , the length of the first right-angled side is less than or equal to the thickness of the light guide plate 3 , and the length of the second right-angled side is greater than or equal to the width of the light emitting surface of the light source. The loss of light is reduced, and the utilization rate of light is improved.

With the above two structures, as shown in Figure 3 and Figure 4, the light mixing distance from the light emitting surface of the light emitting element 1 to the effective display area 7 of the light guide plate 3 is the distance a from the light emitting surface of the light emitting element 1 to the reflecting surface of the reflecting device 5 The sum of the distance b from the reflective surface to the effective display area 7 of the light guide plate 3 is a+b, and the light mixing distance between the light emitting surface of the light emitting element 1 in the structure of Figure 1 and the effective display area of the light guide plate is b, therefore, By adopting the structure of the above backlight module, the light mixing distance between the light emitting surface of the light emitting element 1 and the effective display area 7 of the light guide plate 3 is increased. The light can be evenly mixed before entering the effective display area 7, and the firefly phenomenon does not appear, thereby improving the backlight effect.

In the structures of the above two backlight modules, the reflection surface of the reflection device 5 reflects the light emitted by the light source 4 into the light incident surface of the light guide plate 3, which increases the confusion between the light emitting surface of the light emitting element 1 and the effective display area of the light guide plate. The light distance enables the light to be evenly mixed before entering the effective display area of the light guide plate, avoiding the phenomenon of uneven brightness and darkness of the display panel, that is, the Hotspot firefly phenomenon, and thus improving the display effect of the display panel.

It should be noted that the light emitting element 1 in the above light source may be other light emitting elements such as LED lamp, fluorescent lamp or incandescent lamp.

The present invention also provides a display device, comprising the above-mentioned backlight module.

The display device in this embodiment can be any product or component with a display function, such as an electronic book, a mobile phone, a tablet computer, a television set, a notebook computer, a digital photo frame, a navigator, and the like.

In the description of the invention, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. All of them should be covered by the scope of the claims and description of the present invention.

Claims (10)

1. a backlight module, comprise: light guide plate and light source, it is characterized in that, also comprise: reflection unit, the exiting surface of described reflection unit is relative with the incidence surface of described light guide plate, the incidence surface of described reflection unit is relative with described light source, for the light reflection from described light source outgoing being entered the incidence surface of described light guide plate;

Wherein, described light source is at the thickness direction emergent ray of described light guide plate.

2. backlight module according to claim 1, is characterized in that, described reflection unit comprises reflecting surface, and the angle of the thickness direction of described reflecting surface and described light guide plate is acute angle.

3. backlight module according to claim 2, is characterized in that, described reflection unit and described light guide plate one-body molded.

4. backlight module according to claim 2, is characterized in that, described reflection unit is prism.

5. backlight module according to claim 4, it is characterized in that, the cross section of described prism is right angled triangle, and the first right-angle side corresponds to the incidence surface of described light guide plate, second right-angle side corresponds to the exiting surface of described light guide plate, and hypotenuse corresponds to the reflecting surface of described light guide plate.

6. backlight module according to claim 5, is characterized in that, the length of described first right-angle side is less than or equal to the thickness of described light guide plate.

7. backlight module according to claim 5, is characterized in that, the length of described second right-angle side is more than or equal to the width of the exiting surface of described light source.

8. backlight module according to claim 1, is characterized in that, also comprises backboard, and described backboard comprises depressed part, and described light source is arranged on described depressed part.

9., according to the backlight module of claim 1-8 according to any one of it, it is characterized in that, multiple light-emitting components that described light source comprises lamp bar and arranges at equal intervals each other along the bearing of trend of described lamp bar.

10. a display unit, is characterized in that, comprises backlight module as claimed in any one of claims 1-9 wherein.