CN112230477A - Backlight module and display device - Google Patents

Abstract

The embodiment of the invention discloses a backlight module and a display device. The backlight module comprises: including the backplate and be located the backplate and be close to the light source of backlight unit light-emitting side, backlight unit includes first light emitting zone and second light emitting zone, backplate in the first light emitting zone is protruding towards backlight unit light-emitting side, the mixed light distance in first light emitting zone is less than the mixed light distance in second light emitting zone, make the less mixed light distance in first light emitting zone than the second light emitting zone form a space and be used for holding the mainboard, electronic material such as power, from this setting, thereby with the mainboard, thereby electronic material such as power and backlight unit wholly set up and form the complete machine state, make complete machine backshell and backplate highly keep flushing, the thickness of complete machine has effectively been reduced, reach whole unanimous appearance characteristics.

Description

Backlight module and display device

Technical Field

The embodiment of the invention relates to the technical field of backlight source structures, in particular to a backlight module and a display device.

Background

In recent years, the flat panel display technology has been developed dramatically, and the demand for a thin and large-sized lcd is increasing. Since liquid crystal is a non-emissive material, a backlight is added below the liquid crystal required by the liquid crystal display to present images. Backlights are generally classified into edge type and direct type depending on the position of the light source.

To straight following formula backlight, light source direct mount need increase mainboard, power lamp electronic equipment in the bottom of backlight on original backlight unit's basis to form the complete machine state, increase similar electronic equipment and can cause complete machine thickness to increase, destroyed the outward appearance of complete machine, increased hanging thickness, increased complete machine package material cost simultaneously, reduced the transportation loading volume.

Disclosure of Invention

The embodiment of the invention provides a backlight module and a display device, which are used for reducing the thickness of the whole machine and accommodating electronic components by using saved space, so that the rear shell and a back plate of the whole machine are at the same height, and the appearance characteristic of the whole machine is consistent.

In a first aspect, an embodiment of the present invention provides a backlight module, including a back plate and a light source located on the back plate near a light exit side of the backlight module;

the backlight module comprises a first light emitting area and a second light emitting area, and the back plate in the first light emitting area protrudes towards the light emitting side of the backlight module.

Optionally, the light source includes a plurality of light bars, the light bar in the first light emitting area is a reflective light bar, and the light bar in the second light emitting area is a refractive light bar.

Optionally, the light bar extends along a first direction, and the first direction is perpendicular to the arrangement direction of the first light emitting area and the second light emitting area;

the first light-emitting area further comprises a refraction type light bar, and the refraction type light bar is located on one side, far away from the second light-emitting area, of the reflection type light bar in the first light-emitting area.

Optionally, a distance between the light bars adjacently arranged in the first light emitting area and the second light emitting area is a, a distance between the refraction type light bar and the adjacent reflection type light bar in the first light emitting area is B, and a is greater than B.

Optionally, a distance between adjacent light bars in the first light emitting area is C, a distance between adjacent light bars in the second light emitting area is D, and C is less than D.

Optionally, the light bar comprises a plurality of light emitting elements;

in the refraction type light bar in the first light emitting area, the distance between the light emitting elements at two ends and the adjacent light emitting elements is E, the distance between any adjacent light emitting elements in the other light emitting elements except the light emitting elements at two ends is F, and E is larger than F.

Optionally, in the refractive light bar in the first light emitting area, light emitting elements at two ends are a first light emitting element and a second light emitting element, the first light emitting element is located at a first corner of the backlight module, the second light emitting element is located at a second corner of the backlight module, a distance between the first light emitting element and the first corner is G, a distance between the second light emitting element and the second corner is H, and a value range of G and H is 80-140 mm.

Optionally, the backlight module further includes at least one optical film, the at least one optical film is located on a side of the light source away from the light emitting element, and a portion of each optical film located in the first light emitting area protrudes toward a light emitting side of the backlight module.

Optionally, the light bar comprises a plurality of light emitting elements;

in the reflective lamp strip, the light-emitting element comprises an LED lamp and a reflector positioned on the light-emitting side of the LED lamp, and the reflecting surface of the reflector is a plane.

In a second aspect, an embodiment of the present invention further provides a display device, including the backlight module according to the first aspect, a rear case, and an electronic material;

the rear shell is positioned on one side, far away from the light emitting side, of the backlight module, an accommodating space is formed between the back plate and the rear shell in the first light emitting area, and the electronic materials are arranged in the accommodating space.

The backlight module provided by the embodiment of the invention comprises a back plate and a light source which is positioned on the back plate and close to the light emitting side of the backlight module, wherein the backlight module comprises a first light emitting area and a second light emitting area, the back plate in the first light emitting area protrudes towards the light emitting side of the backlight module, two different optical lenses are adopted in the first light emitting area and the second light emitting area in the same backlight cavity to form an ultrathin cavity, the thickness of the whole backlight module is reduced, and electronic components are accommodated in the saved space, so that the back shell and the back plate of the whole backlight module are at the same height, and the appearance characteristics of the whole backlight module are consistent.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a light propagation of a first light-emitting region in a backlight module according to an embodiment of the invention;

fig. 3 is a schematic diagram illustrating light propagation in a second light-emitting region of a backlight module according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another light propagation scheme provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view taken along line AB of fig. 6 according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention. As shown in fig. 1, the backlight module includes a back plate 110 and a light source 140 located on the back plate 110 near the light emitting side of the backlight module, the backlight module includes a first light emitting region 130 and a second light emitting region 120, and the back plate 110 in the first light emitting region 130 protrudes toward the light emitting side of the backlight module.

The backlight module is a provider of the light source of the liquid crystal display, because the liquid crystal does not emit light, the performance of the light source of the backlight module determines the visual sense of the display, the backlight module can be divided into a front light type and a backlight type, and the backlight type can be classified according to the scale requirement of the backlight module by the position of the light source and can be divided into an edge light type, a direct type and a central control type. In this embodiment, the backlight module is selected as a direct type backlight module, and in order to realize an ultra-thin direct type backlight module, the light mixing distance in the backlight module needs to be reduced, wherein the light mixing distance is the distance from the bottom reflective sheet or the light source to the film material in the direct type backlight module.

Specifically, the light mixing distances of the first light emitting region 130 and the second light emitting region 120 in the backlight module are different. Fig. 2 is a schematic diagram of light propagation of a first light-emitting region in a backlight module according to an embodiment of the invention. As shown in fig. 2, in the first light-emitting region 130, the light-mixing distance is L1, and when the light is emitted by the light source on the light-emitting side of the backlight module, the spot area is K1. Fig. 3 is a schematic diagram of light propagation of a second light-emitting region in a backlight module according to an embodiment of the invention. As shown in fig. 3, in the second light emitting region 120, the light mixing distance is L2, and when the light source at the light emitting side of the backlight module emits light, the spot area is K2. In this embodiment, the light mixing distance L1 of the first light emitting region 130 may range from 23mm to 10mm, and the light mixing distance L2 of the second light emitting region 120 may range from 25mm to 40mm, and in order to ensure that the light emitting efficiencies of the first light emitting region 130 and the second light emitting region 120 are consistent in the same backlight module, K1 needs to be set to be approximately equal to K2.

It should be noted that, the back plate in the first light emitting area 130 in the backlight module is arranged to protrude towards the light emitting side of the backlight module, and the light mixing distance L1 of the first light emitting area 130 is smaller than the light mixing distance L2 of the second light emitting area 120, so that the first light emitting area 130 forms a space for accommodating electronic materials such as a motherboard and a power supply compared with the second light emitting area 120, and therefore, the arrangement is adopted, the electronic materials such as the motherboard and the power supply and the backlight module are integrally arranged to form a complete machine state, the height of the complete machine back shell and the back plate are kept flush, and the thickness of the complete machine is effectively reduced.

The backlight module that this embodiment provided, including the backplate and be located the light source that the backplate is close to backlight unit light-emitting side, backlight unit includes first light emitting zone and second light emitting zone, backplate in the first light emitting zone is protruding towards backlight unit light-emitting side, the mixed light distance in first light emitting zone is less than the mixed light distance in second light emitting zone, make the less mixed light distance in first light emitting zone than the second light emitting zone form a space and be used for holding the mainboard, electronic material such as power, with this setting, thereby with the mainboard, electronic material such as power and backlight unit wholly set up and form the complete machine state, make complete machine backshell and backplate highly keep flushing, the thickness of complete machine has effectively been reduced, reach whole unanimous appearance characteristics.

Optionally, fig. 4 is a schematic structural diagram of a backlight module according to an embodiment of the present invention. As shown in fig. 4, the light source includes a plurality of light bars, the light bars in the first light-emitting area 130 are reflective light bars, and the light bars in the second light-emitting area 120 are refractive light bars.

The light sources of the first light emitting area 130 and the second light emitting area 120 are located on the light emitting side of the back plate 110 close to the whole backlight module. In the first light-emitting area 130, the reflective light bar is used as a light source, and the light emitted from the light bar is optically turned on for the second time by using the principle of the reflective lens, and then directly acts on the reflector. In the second light emitting region 120, the refraction type light bar is used as a light source, and after the light emitted by the light bar is optically turned on for the second time, the light does not act on the reflector but directly exits through the lens.

It should be noted that, in this implementation, each light bar is provided with a plurality of light emitting units, each light emitting unit may be an LED lamp, and the LED lamp may be assembled on a flexible circuit board or a PCB. The light bar 140 combines two different optical lenses to perform secondary optical turn-on the light emitted by the LED lamp, for example, in the first light emitting area 130, a reflective lens is covered on each LED lamp on the light bar, and the light emission is realized by using the reflective lens principle, and in the second light emitting area 120, a refractive lens is covered on each LED lamp on the light bar, and the light emission is realized by using the refractive principle. In addition, in this embodiment, the number of the LED lamps on each light bar is set by a designer according to different lighting requirements, and is not limited herein.

Optionally, with reference to fig. 4, the light bar extends along a first direction x, the first direction x is perpendicular to the arrangement direction y of the first light emitting area 130 and the second light emitting area 120, the first light emitting area 130 further includes a refractive light bar 1411, and the refractive light bar 1411 is located on a side of the reflective light bar 1412 in the first light emitting area 130, which is far away from the second light emitting area 120.

The refractive light bar 1411 is disposed in the first light-emitting area 130, so that the amount of light directly acting on the inclined surface of the reflector can be effectively reduced.

Specifically, the opening angle of the light is controlled to be reduced by the refraction type light bar 1411, so that the number of emergent light is reduced, and light accumulation and light spot phenomena caused by the fact that too much light is gathered on the inclined plane of the reflector are avoided.

It should be noted that, because the first light-emitting area 130 adopts the principle of a reflective lens to open light for the second time, the inclined plane near the reflector at the outermost layer of the first light-emitting area 130 needs to be disposed during the refracting light bar 1411, and when the light is emitted from the reflective light bar 1412 except the refracting light bar 1411 in the first light-emitting area 130, the accumulation of light gathered on the inclined plane of the reflector is effectively reduced.

Optionally, with reference to fig. 4, a distance between the light bars adjacently disposed in the first light emitting area 130 and the second light emitting area 120 is a, a distance between the refractive light bar 1411 and the adjacent reflective light bar 1412 in the first light emitting area 130 is B, and a > B.

In the first light emitting area 130, the distance B between the refractive light bar 1411 and the adjacent reflective light bar 1412 is smaller than the distance a between the light bars adjacently disposed in the first light emitting area 130 and the second light emitting area 120, and since the light mixing distance of the first light emitting area 130 is smaller than the light mixing distance of the second light emitting area 120, in order to solve the problem of insufficient opening of the light angle of the light emitted from the refractive light bar due to the short light mixing distance of the first light emitting area 130, the distance between the reflective light bar 1412 and the refractive light bar 1411 in the first light emitting area 130 is reduced, so that a uniform display image can be obtained.

Optionally, with reference to fig. 4, a distance between adjacent light bars in the first light emitting area is C, a distance between adjacent light bars in the second light emitting area is D, and C is less than D.

Referring to fig. 4, since the second optical zone 120 emits light through the refractive lens based on the same light emitting principle, each light bar in the second optical zone 120 extends along the horizontal direction x and is arranged along the vertical direction y, wherein each light bar is arranged at equal intervals along the vertical direction y.

Similarly, because the light mixing distance of the first light emitting area 130 is short, on the basis of the refractive light bar 1411 arranged in the first light emitting area 130, the poor appearance of the light and dark bands around the backlight caused by the reflective light bar 1412 can be effectively improved by shortening the distance between the refractive light bar 1411 and the reflective light bar 1412 in the first light emitting area 130.

Optionally, with reference to fig. 4, the light bar includes a plurality of light emitting elements 1413, in the refractive light bar 1411 in the first light emitting area 130, a distance between a light emitting element at each end and an adjacent light emitting element is E, and in other light emitting elements except the light emitting elements at each end, a distance between any adjacent light emitting elements is F, where E > F.

The backlight cavity is composed of a back plate 110, a first light emitting area 130 and a second light emitting area 120, the light mixing distance of the first light emitting area 130 is shorter than that of the second light emitting area 120, a refraction type light bar 1411 of the first light emitting area 130 is arranged close to the edge of the first light emitting area 130, when LED lamps are arranged on the refraction type light bar 1411, in order to ensure that the light mixing distance of the whole backlight cavity is uniform in light emitting, the LED lamps at the two ends of the refraction type light bar 1411 are close to the corner of the backlight cavity as far as possible, the distance from the LED lamps at the two ends to the LED lamps adjacent to the two ends is larger than the distance between every two middle LED lamps, the corner of the backlight cavity cannot have a dark corner phenomenon, and the phenomenon that the first light emitting area 130 emits light unevenly is avoided.

Optionally, with reference to fig. 4, in the refractive light bar 1411 in the first light emitting area 130, the light emitting elements at two ends are the first light emitting element 1414 and the second light emitting element 1415, the first light emitting element 1414 is located at the first corner 150 of the backlight module, the second light emitting element 1415 is located at the second corner 151 of the backlight module, the distance between the first light emitting element 1414 and the first corner 150 is G, the distance between the second light emitting element 1415 and the second corner 151 is H, and the value ranges of G and H are 80-140 mm.

In particular, on the basis of the above embodiments, in order to avoid the dark corner phenomenon at the corner of the backlight cavity, the first light emitting element 150 and the second light emitting element 151 are disposed at the two ends of the refractive light bar 1411 of the first light emitting area 130, so that the first light emitting element 150 and the second light emitting element 151 are far away from the rest of the light emitting units on the refractive light bar 1411, in order to define the distance between the first 1414 and second 1415 light-emitting elements and the corners of the backlight cavity, to avoid the dark corner phenomenon, the distance between the first light emitting unit 1414 and the first corner 150 of the backlight module can be set between 80-140mm by the designer, and likewise, the distance between the second light emitting unit 1415 and the second corner 151 of the backlight module can be set between 80-140mm, within which the dark angle distance in the backlight cavity can be adjusted.

For example, in the first light emitting area 130, if the number of the emergent light applied to the inclined surface of the reflector is large, and the angle of the light of the refractive light bar 1411 in the first light emitting area 130 is large, the dark and bright bands and the dark angle phenomenon may be caused, and at this time, the dark angle distances G and H in the first light emitting area 130 may be adjusted. The dark corner distances G and H are shortened to make the first light-emitting unit 1414 and the second light-emitting unit 1415 on the refractive light bar 1411 in the first light-emitting region 130 as close as possible to the corner of the backlight module, so as to eliminate the dark corner phenomenon.

Optionally, the backlight module further includes at least one optical film, the at least one optical film is located on a side of the light source away from the light emitting element, and a portion of each optical film located in the first light emitting area protrudes toward a light emitting side of the backlight module.

Specifically, on the basis of the above embodiment, since the back plate in the first light-emitting region of the backlight module protrudes toward the light-emitting side of the backlight module, in order to achieve the display effect, at least one optical film needs to be disposed in the backlight module and is located on one side of the light-emitting element based on the light source principle. In the process of manufacturing the backlight module, the part of the optical film positioned in the first light-emitting area is protruded towards the light-emitting side of the backlight module, so that the backlight module is integrally formed, and the manufacturing flow of the backlight module is simplified.

Optionally, the light bar includes a plurality of light emitting elements, and in the reflective light bar, the light emitting elements include an LED lamp and a reflector located at a light exit side of the LED lamp, and a light reflecting surface of the reflector is a plane.

Light emitted by the reflective lamp strip in the first light-emitting area can form light accumulation around the reflector, so that an obvious light spot is presented.

It should be noted that, in order to solve the above problems, the conventional measures are to make the naturally bent reflector smooth and transition to reduce light accumulation, and in addition, the silk-screen printing technology or the punching technology is adopted to add silk-screen printing ink dots and light absorbing holes on the reflective surface of the reflector to dilute and adjust the accumulation of the optical fibers, thereby partially improving the appearance of the bright and dark bands and dark corners. However, the reflector that is bent naturally is stressed unevenly due to smooth transition, large internal stress exists after bending, and the reflector is easily deformed due to the temperature and humidity of the environment and stress of the backlight cavity, so that the phenomena of optical uneven reflection, bright spots and the like occur, and the display yield is reduced.

Specifically, fig. 5 is a schematic diagram of another light propagation method provided by the embodiment of the present invention. As shown in fig. 5, in this embodiment, to solve the above problem, the light bar near the edge of the reflector in the first light-emitting area 130 is a refraction light bar, and the light-reflecting surface 160 of the reflector can be a pre-bent plane, so as to ensure that the shape of the reflector after being bent does not change, thereby improving the phenomenon of bright spots caused by uneven stress in the reflector of the reflection light bar.

Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 7 is a schematic cross-sectional view taken along line AB of fig. 6 according to an embodiment of the present invention. As shown in fig. 7, the display device includes the backlight module 100, the rear case 180 and the electronic material 190 provided in the above embodiment, the rear case 180 is located on a side of the backlight module 100 away from a light emitting side thereof, an accommodating space P is formed between the back plate in the first light emitting region 130 and the rear case 180, and the electronic material 190 is disposed in the accommodating space P.

Specifically, on the basis of the above embodiment, the back plate in the first light emitting area 130 in the backlight module 100 is convexly arranged towards the light emitting side of the backlight module 100, and the light mixing distance of the first light emitting area 130 is smaller than the light mixing distance of the second light emitting area 120, so that the first light emitting area 130 forms an accommodating space P with a smaller light mixing distance than the second light emitting area 120, the accommodating space P is used for accommodating electronic materials such as a motherboard and a power supply, and the rear shell 180 is positioned on one side of the light emitting side of the backlight module 100, so that the height of the rear shell 180 and the back plate of the whole backlight module is kept flush, therefore, the electronic materials such as the motherboard and the power supply and the whole backlight module are arranged to form a whole state, and the thickness of the whole backlight.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A backlight module is characterized by comprising a back plate and a light source positioned on the light emitting side of the back plate close to the backlight module;

the backlight module comprises a first light emitting area and a second light emitting area, and the back plate in the first light emitting area protrudes towards the light emitting side of the backlight module.

2. The backlight module of claim 1, wherein the light source comprises a plurality of light bars, the light bars in the first light-emitting area are reflective light bars, and the light bars in the second light-emitting area are refractive light bars.

3. The backlight module of claim 2, wherein the light bar extends along a first direction, and the first direction is perpendicular to the arrangement direction of the first light emitting areas and the second light emitting areas;

the first light-emitting area further comprises a refraction type light bar, and the refraction type light bar is located on one side, far away from the second light-emitting area, of the reflection type light bar in the first light-emitting area.

4. The backlight module of claim 3, wherein the distance between the adjacent light bars in the first light-emitting area and the second light-emitting area is A, the distance between the refractive light bar and the adjacent reflective light bar in the first light-emitting area is B, and A > B.

5. The backlight module of claim 2, wherein a distance between adjacent light bars in the first light emitting region is C, a distance between adjacent light bars in the second light emitting region is D, and C < D.

6. The backlight module of claim 3, wherein the light bar comprises a plurality of light emitting elements;

in the refraction type light bar in the first light emitting area, the distance between the light emitting elements at two ends and the adjacent light emitting elements is E, the distance between any adjacent light emitting elements in the other light emitting elements except the light emitting elements at two ends is F, and E is larger than F.

7. The backlight module as claimed in claim 6, wherein the light emitting elements at two ends of the refractive light bar in the first light emitting area are a first light emitting element and a second light emitting element, the first light emitting element is located at a first corner of the backlight module, the second light emitting element is located at a second corner of the backlight module, a distance between the first light emitting element and the first corner is G, a distance between the second light emitting element and the second corner is H, and values of G and H range from 80 mm to 140 mm.

8. The backlight module as claimed in claim 1, further comprising at least one optical film disposed on a side of the light source away from the light emitting elements, wherein a portion of each optical film in the first light emitting area is convex toward a light emitting side of the backlight module.

9. The backlight module of claim 2, wherein the light bar comprises a plurality of light emitting elements;

in the reflective lamp strip, the light-emitting element comprises an LED lamp and a reflector positioned on the light-emitting side of the LED lamp, and the reflecting surface of the reflector is a plane.

10. A display device, comprising the backlight module of claims 1-9, a rear housing and an electronic material;

the rear shell is positioned on one side, far away from the light emitting side, of the backlight module, an accommodating space is formed between the back plate and the rear shell in the first light emitting area, and the electronic materials are arranged in the accommodating space.

Images