CN105158978B - Backlight and display device - Google Patents

Abstract

The invention provides a backlight source and a display device. The backlight includes a light-emitting unit and a diffusion plate, the light-emitting unit includes a plurality of rotating areas, at least one light source is arranged in each rotating area, the light emitting surface of the light source faces the side wall of the backlight, and the backlight The side walls of the reflector reflect light that strikes it toward the diffuser. The light source in the above-mentioned backlight emits light toward the side wall of the backlight in a rotating state, and emits light from the diffusion plate after reflection. When the light mixing distance is constant, the optical path of the light from the light source to the diffusion plate is increased, thereby improving the illumination. The uniformity of the light in each area on the diffusion plate helps to improve the uniformity of the display screen; at the same time, it can also reduce the thickness of the backlight source. In addition, compared with the prior art, in the present invention, the requirement on the light emitting angle of the light source is not high, and the cost of the backlight source can be reduced correspondingly.

Description

Backlight and display device

technical field

The invention relates to the technical field of liquid crystal display, in particular to a backlight source and a display device.

Background technique

The backlight source is an indispensable part of the liquid crystal display device to realize the display. Existing backlights are mainly classified into direct-type backlights and side-type backlights.

FIG. 1 is a schematic diagram of a conventional direct-lit backlight. As shown in Figure 1, this backlight comprises diffuser plate 11 and light source 14 (generally LED), and described diffuser plate 11 and light source 14 are installed on the backboard 12 of backlight source (only shows backplate 12 in Figure 1 side walls). In the backlight shown in FIG. 1 , the light emitting direction of the light source 14 faces the direction of the diffuser plate 11 , and the light passes through the diffuser plate 11 and is emitted from the light emitting surface of the backlight source.

In the above-mentioned direct type backlight, in order to make the light irradiated on the diffusion plate 11 as uniform as possible (that is, to make the brightness of each place on the diffusion plate 11 as uniform as possible), on the one hand, the number of light sources 14 can be increased, Increase the distribution density of the light sources 14; however, this will result in the generation of a large amount of heat, and when the heat cannot be dissipated in time, the heat will cause damage to the diffusion plate 11 and other components. On the other hand, the light emitting angle of the light source 14 can be increased, so that the light emitted by each light source 14 can be mixed to a greater extent; Lighting angle, etc.; but this will undoubtedly increase the cost of the backlight. In addition, the distance between the light source 14 and the diffuser plate 11 can also be increased, so that the light emitted by each light source 14 can achieve a greater degree of light mixing; this can also increase the uniformity of the light irradiated on the diffuser plate 11, but in this way It will make the thickness of the backlight source larger.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a backlight source and a display device, which can reduce the thickness of the backlight source, and improve the uniformity of light irradiated on the diffuser plate, and at the same time Can reduce costs.

To achieve the object of the present invention, a backlight source is provided, which includes a light emitting unit and a diffusion plate, the light emitting unit includes a plurality of rotating areas, at least one light source is arranged in each rotating area, and the light emitting surface of the light source faces the The side wall of the backlight source reflects the light irradiated thereon to the diffuser plate.

Wherein, the backlight source further includes a plurality of driving mechanisms, and each driving mechanism corresponds to a rotating area, and is used to drive the rotating area to rotate.

Wherein, the area irradiated by the light emitted by the light source on the side wall of the backlight source is coated with a reflective material, or attached with a reflective sheet/reflective film.

Wherein, a plurality of light sources are arranged in each rotating area, and each light source is located outside the light emitting direction of other light sources on the rotating area.

Wherein, the number of light sources in any two adjacent rotation areas is different.

Wherein, any two adjacent rotating zones rotate at different speeds.

Wherein, the number of light sources in each rotating area is the same; in the rotating state, there is a first predetermined deflection angle between the light emitting directions of corresponding light sources in any two adjacent rotating areas.

Wherein, any two adjacent rotating areas start rotating at different times when the backlight emits light.

Wherein, before the backlight source emits light, there is a second predetermined deflection angle between the corresponding light sources of any two adjacent rotation zones.

Wherein, the rotating speeds of the rotating zones are the same.

Wherein, the rotating zones are arranged in multiple rows and/or multiple columns.

Wherein, the driving mechanism is a motor, the motor is fixed on the backboard of the backlight source, and the motor and the light source are respectively located on both sides of the backboard, the drive shaft of the motor runs through the backboard, and the The side where the light source is located is connected with a light source or a turntable on which a plurality of light sources are installed.

Wherein, the driving mechanism is a motor, and the motor is fixed on the back plate of the backlight source. A light source or a turntable is installed on the top of the drive shaft of the motor, and a plurality of light sources are arranged on the turntable. The drive of the motor A shaft runs through the back plate.

As another technical solution, the present invention also provides a display device, which includes the above-mentioned backlight source.

The present invention has the following beneficial effects:

In the backlight provided by the present invention, the light source emits light toward the side wall of the backlight in a rotating state, and emits light from the diffusion plate after reflection. When the light mixing distance is constant, the light path from the light source to the diffusion plate increases. Therefore, the uniformity of the light irradiated on each area of the diffusion plate is improved, which is helpful to improve the uniformity of the display screen; at the same time, the thickness of the backlight source can also be reduced. In addition, compared with the prior art, in the present invention, the requirement on the light emitting angle of the light source is not high, and the cost of the backlight source can be reduced correspondingly.

The display device provided by the present invention, which adopts the above-mentioned backlight source provided by the present invention, can reduce the thickness of the backlight source, thereby helping to reduce the thickness of the display device; and, can also improve the uniformity of the light-emitting surface of the backlight source, thereby helping To improve display quality; in addition, it can also reduce costs.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of an existing direct-type backlight;

2 is a schematic diagram of a backlight source in the first embodiment;

FIG. 3 is a schematic diagram of a backplane of the backlight shown in FIG. 2;

Fig. 4 is a schematic diagram of the first structure of the driving mechanism in the backlight shown in Fig. 2;

Fig. 5 is a schematic diagram of a second structure of the driving mechanism in the backlight described in Fig. 2;

6 is a schematic diagram of a backlight source in a second embodiment;

FIG. 7 is a schematic diagram of a first structure of the driving mechanism in the backlight shown in FIG. 6;

FIG. 8 is a schematic diagram of a second structure of the driving mechanism in the backlight shown in FIG. 6;

FIG. 9 is a schematic diagram of an arrangement of light sources in the rotating area in the backlight shown in FIG. 6;

10 is a schematic diagram of a backlight in a third embodiment;

FIG. 11 is a schematic diagram of a backlight in a fourth embodiment.

Among them, reference signs:

11: diffusion plate; 12: back plate; 13, 13a, 13b, 13c, 13d: rotating area; 14, 14-1, 14-2, 14-3, 14-4: light source; 15: driving mechanism.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

The present invention provides multiple implementations of a backlight source. FIG. 2 is a schematic diagram of a backlight in the first embodiment; FIG. 3 is a schematic diagram of a backplane of the backlight shown in FIG. 2 . As shown in Fig. 2 and Fig. 3, described backlight comprises light-emitting unit 10 and diffuser plate 11, besides, described backlight also comprises backplate 12 (only the side wall of backplate 12 is shown in Fig. 2 ), the light emitting unit 10 and the diffusion plate 11 are installed on the back plate 12 . The light emitting unit 10 includes a plurality of rotating areas 13, and a light source 14 is arranged in each rotating area 13, and the light emitting surface of the light source 14 faces the side wall of the backlight source (that is, the side wall of the back plate 12). The side walls of the backlight reflect the light irradiated thereon to the diffuser plate 11 .

When the backlight source is working, each rotating area 13 maintains a rotating state; the light source 14 provided in each rotating area 13 emits light, and during the rotation process of the rotating area 13, it continuously illuminates various areas of the side walls around the backlight source, and The side walls of the backlight reflect the light to different areas on the diffuser plate 11 to light up the areas. The light sources 14 in the plurality of rotating areas 13 work together to light up each area of the diffuser plate 11, so that the backlight source can be used as a surface light source.

The distance between the light source 14 and the diffusion plate 11 is the light mixing distance. In the prior art, the light mixing distance is the optical path of light between the light source 14 and the diffusion plate 11. It can be understood that if the light mixing distance is small, then The light emitted by multiple light sources 14 cannot be fully mixed, so that the uniformity of the brightness of the light irradiated on different regions on the diffuser plate 11 is relatively poor. The brightness of light in different areas on the diffuser plate 11 is higher, but the thickness of the backlight source becomes larger. However, in this embodiment, when the light mixing distance is constant, the light path from the light source 14 to the diffusion plate 11 is relatively increased, so that the light emitted by multiple light sources 14 can be more fully mixed, so that the irradiated light reaches the diffusion plate 11. The light in each area on the plate 11 is more uniform, which improves the uniformity of the brightness of the diffusion plate 11, and can also reduce the thickness of the backlight source. At the same time, compared with the prior art, in this embodiment, the requirement on the light emitting angle of the light source 14 is not high, and the cost of the backlight source can be reduced correspondingly.

The backlight also includes a plurality of driving mechanisms 15, each of which corresponds to a rotating area 13, and is used to drive the rotating area 13 to rotate. Specifically, the driving mechanism 15 may be a motor, and the motor is fixed on the backplane 12 of the backlight (specifically, the bottom surface of the backplane 12 ). Specifically, as shown in FIG. 4 , the light source 14 is connected to the drive shaft of the motor through screws or the like; or, as shown in FIG. 5 , the light source 14 is directly installed on the drive shaft of the motor. When assembling the backlight, pass the drive shaft of the motor through the hole on the backplane 12, so that the motor and the light source 14 are located on both sides of the backplane 12, and then fix the motor on the backplane 12 by screws or buckles. superior. Therefore, when the backlight source is working, the motor directly drives the light source 14 connected to it to rotate.

Preferably, the area irradiated by the light emitted by the light source 14 on the side wall of the backlight is coated with a reflective material, or is attached with a reflective sheet/reflective film, so that the side wall of the backlight has a higher reflection efficiency, so as to reflect more light onto the diffuser plate 11. Specifically, the reflective material may be silver, chrome and other materials.

The rotation zones 13 may be arranged in multiple rows and/or columns, as shown in FIG. 3 . Of course, the rotating regions 13 can also be arranged in other ways. Specifically, the arrangement of the rotating regions 13 is subject to the consistency of the intensity of light that is finally irradiated to different regions on the diffuser plate 11. As long as this requirement is met, each The rotation zones 13 can be arranged in any manner.

FIG. 6 is a schematic diagram of a backlight source in a second embodiment. As shown in FIG. 6 , the difference between this embodiment and the above-mentioned first embodiment is that there are multiple light sources 14 in each rotating area 13 , and the multiple light sources 14 are installed on a turntable. Specifically, in this embodiment, the rotation speeds of the rotation zones 13 are the same.

In this embodiment, specifically, the turntable can be connected to the drive shaft of the motor through screws, etc., as shown in Figure 7; for the backlight structure shown in Figure 7, when assembling, first, the drive shaft of the motor Through the hole on the backboard 12, the motor is fixed on the backboard 12 by screws or buckles, and then the drive shaft of the motor is connected to the turntable on the other side of the backboard 12; it can be understood that the The holes can be made smaller. In addition to the embodiment shown in Figure 7, in this embodiment, the turntable can also be directly fixed on the drive shaft of the motor, as shown in Figure 8; for the backlight structure shown in Figure 8, when assembling, the motor's The drive shaft and the turntable pass through the holes on the backboard 12, so that the motor and the turntable are respectively located on both sides of the turntable 12, and then the motor is fixed on the backboard 12 by screws or buckles. Compared with the structure shown in FIG. 7 , in this embodiment, the holes on the back plate 12 need to be set larger.

In this embodiment, the number of light sources 14 provided in each rotating area 13 is multiple, for example, 4 as shown in FIG. 6 . Therefore, compared with the above-mentioned first embodiment, the number of light sources provided in the backlight increases, which can improve the uniformity and brightness of the light irradiated on the diffuser plate.

In this embodiment, the number of light sources 14 in each rotating area 13 is the same, and the light sources 14 in each rotating area 13 correspond one-to-one. For example, in Fig. 6, four light sources 14 are respectively arranged in the rotating areas 13a, 13b, 13c, 13d..., wherein, the light sources 14-1 in each rotating area have the same orientation direction, and they are corresponding light sources, similarly , the light sources 14-2 in each rotating area are mutually corresponding light sources, the light sources 14-3 in each rotating area are mutually corresponding light sources, and the light sources 14-4 in each rotating area are mutually corresponding light sources. Specifically, the rotating speeds of the rotating areas 13 may be the same; thus, when the rotating areas 13 are in a rotating state, the relative positions of the corresponding light sources 14 remain unchanged.

Preferably, in the rotating state, there is a first predetermined deflection angle between the light emitting directions of the corresponding light sources 14 in any two adjacent rotating areas 13; that is, in the rotating state, the corresponding light sources 14 in adjacent rotating areas 13 The light emitting directions are different, so that the area between the multiple light sources 14 in each rotating zone 13 can be irradiated by the light sources 14 in the adjacent rotating zone, thereby further improving the uniformity of light irradiated on the diffuser plate 11 . Specifically, the light sources 14 in the rotating area 13 can be set so that: before the backlight emits light, there is a second predetermined deflection angle between the corresponding light sources 14 in any two adjacent rotating areas 13, as shown in FIG. 9 As shown in the rotating areas 13a-13d; in this way, when rotating, the corresponding light sources 14 in the adjacent rotating areas 13 will have deviations in the rotating state. Specifically, the rotating area 13 gradually rotates from stillness, increasing the rotational speed to a stable rotating state. In this process, the deviation between the corresponding light sources 14 of adjacent rotating areas 13 when the rotating area 13 is not rotating is generally different from that of the rotating area. 13 is in a stable rotating state, the deviation between the two, therefore, when the rotating area does not rotate, the deviation between the corresponding light sources 14 of adjacent rotating areas 13 is the second predetermined deflection angle, while in the rotating state , the deviation between the corresponding light sources 14 of adjacent rotation zones 13 is the first predetermined deflection angle.

In addition to the above-mentioned embodiments, in this embodiment, before the backlight emits light, the direction of the corresponding light source 14 of each rotating area 13 can also be the same, and by making any two adjacent rotating areas 13 emit light when the backlight emits light The time at which the rotation starts is different, realizing that the corresponding light source 14 of any adjacent rotation zone 13 has a first predetermined deflection angle in the rotation state.

Specifically, in each rotating area 13, each light source 14 is located outside the light emitting direction of other light sources 14 on the rotating area 13; the light emitting direction of each light source 14 in each rotating area 13 is radial and divergent.

FIG. 10 is a schematic diagram of a backlight source in a third embodiment. As shown in Figure 10, the difference between this embodiment and the above-mentioned second embodiment is that the number of light sources in any two adjacent rotation areas 13 is not the same; that is, in this embodiment, any adjacent rotation area 13 , each light source 14 does not correspond exactly. This can ensure that in the rotating state, the light emitting directions of the light sources 14 in the adjacent rotating areas 13 will not be completely consistent, so that the area between the light sources 14 in each rotating area 13 will be replaced by the adjacent rotating areas 13. The light emitted by the light source 14 is irradiated to improve the uniformity of the light irradiated on each area on the diffuser plate 11 . Specifically, in this embodiment, the rotation speeds of the rotation zones 13 are the same.

FIG. 11 is a schematic diagram of a backlight in a fourth embodiment. As shown in Figure 11, the difference between this embodiment and the above-mentioned second and third embodiments is that the rotation speeds of any two adjacent rotating areas 13 are different; for example, for the rotating area 13a, its rotational speed is r1; for the rotating area 13b , its rotation speed is r2; for the rotation zone 13c, its rotation speed is r3; for the rotation zone 13d, its rotation speed is 13d. In this way, when the number of light sources in adjacent rotating areas 13 is the same, the relative position of corresponding light sources 14 in adjacent rotating areas 13 in the rotating state can be changed at all times, so that the distance between each light source 14 in each rotating area 13 Areas of the diffuser plate 11 will be irradiated by the light emitted by the light source 14 in the adjacent rotating area 13, so as to improve the uniformity of the light irradiated on each area on the diffuser plate 11.

To sum up, in the backlight provided by the present invention, the light source 14 emits light toward the side wall of the backlight in a rotating state, and emits light from the diffusion plate 11 after reflection. When the light mixing distance is constant, the light is transmitted from the light source 14 to the diffusion plate The optical distance between 11 is increased, thereby improving the uniformity of light irradiated on each area on the diffuser plate 11, which helps to improve the uniformity of the display screen; at the same time, it can also reduce the thickness of the backlight source. In addition, compared with the prior art, in this embodiment, the requirement on the light emitting angle of the light source 14 is not high, and the cost of the backlight source can be reduced accordingly.

The present invention also provides an embodiment of a display device. In this embodiment, the display device includes the backlight provided in the above embodiments of the present invention.

The display device provided by the embodiment of the present invention, which adopts the backlight provided by the above-mentioned embodiment of the present invention, can reduce the thickness of the backlight, thereby helping to reduce the thickness of the display device; and can also improve the uniformity of the light-emitting surface of the backlight , thereby helping to improve display quality; in addition, it can also reduce costs.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (14)

1. a kind of backlight, including luminescence unit and diffuser plate, which is characterized in that the luminescence unit includes multiple Rotary Districts, At least one light source is set in each Rotary District, and the light-emitting surface of the light source is towards the side wall of the backlight, each rotation Area can drive the light source to rotate when the backlight works, so that the light that the light source is sent out is radiated at the backlight On the side wall in source, the light irradiated on it is reflected towards diffuser plate by the side wall of the backlight.

2. backlight according to claim 1, which is characterized in that the backlight further includes multiple driving mechanisms, each Driving mechanism is corresponding with a Rotary District, for the Rotary District to be driven to rotate.

3. backlight according to claim 1, which is characterized in that the illumination sent out on the side wall of the backlight by light source The region coating penetrated has reflecting material or is pasted with reflector plate/reflective membrane.

4. backlight according to claim 1, which is characterized in that multiple light sources, and each light are set in each Rotary District Source is located at except the light direction of other each light sources on the Rotary District.

5. according to the backlight described in Claims 1 to 4 any one, which is characterized in that the light in arbitrary two adjacent Rotary District The quantity in source differs.

6. according to the backlight described in Claims 1 to 4 any one, which is characterized in that arbitrary two adjacent Rotary District rotation Speed is different.

7. backlight according to claim 1, which is characterized in that the quantity of each Rotary District inner light source is identical；

In rotation status, there is the first predetermined deflection angle in arbitrary two adjacent Rotary District between the light direction of corresponding light source Degree.

8. backlight according to claim 7, which is characterized in that arbitrary two adjacent Rotary District is when the backlight shines The time for starting rotation is different.

9. backlight according to claim 7, which is characterized in that before the backlight shines, arbitrary two adjacent rotation There is the second predetermined deflection angle between the corresponding light source in area.

10. backlight according to claim 8 or claim 9, which is characterized in that the speed of each Rotary District rotation is identical.

11. backlight according to claim 1, which is characterized in that each Rotary District is arranged in multirow and/or multiple row.

12. backlight according to claim 2, which is characterized in that the driving mechanism is motor, and the motor is fixed on On the backboard of backlight, and the motor and light source are located at the both sides of backboard respectively, and the drive shaft of the motor runs through the back of the body Plate is connect in the light source side and a light source or the turntable for being equipped with multiple light sources.

13. backlight according to claim 2, which is characterized in that the driving mechanism is motor, and the motor is fixed on On the backboard of backlight, the installation of the drive shaft top of the motor is provided with more on the turntable there are one light source or turntable A light source, the drive shaft of the motor run through the backboard.

14. a kind of display device, which is characterized in that including the backlight described in claim 1~13 any one.