Backlight module

Abstract

The application discloses a backlight module, which comprises a backboard, a light guide plate, a first lamp strip and a second lamp strip. The light guide plate is arranged on one side of the backboard, and one side of the light guide plate is a light inlet surface. The first lamp strip is arranged on one side of the backboard, and at least part of the first lamp strip is located on one side of the light inlet surface of the light guide plate. The second lamp strip is arranged on one side of the backboard, and at least part of the second lamp strip is located on one side of the light inlet surface of the light guide plate. The first lamp strip comprises a plurality of first light emitting devices, and the second lamp strip comprises a plurality of second light emitting devices. The light emitting color of the first light emitting device is different from that of the second light emitting device. The application can improve the display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight module. BACKGROUND

[0002] With the rapid development of liquid crystal display (LCD), consumers have higher and higher requirements on the display effect of liquid crystal display. The backlight module of the traditional liquid crystal display can only provide a single color light source for the module through a light bar, which cannot meet the increasing display requirements of consumers.

[0003] Therefore, it is necessary to provide a new technical scheme to solve the above technical problems. SUMMARY

[0004] The purpose of the present application is to provide a backlight module to improve the display effect.

[0005] To solve the above problems, the technical scheme of the present application is as follows:

[0006] The present application provides a backlight module, comprising:

[0007] a back plate;

[0008] a light guide plate arranged on one side of the back plate, one side of the light guide plate being a light inlet surface;

[0009] a first light bar arranged on one side of the back plate, at least part of the first light bar being located on one side of the light inlet surface of the light guide plate; and

[0010] a second light bar arranged on one side of the back plate, at least part of the second light bar being located on one side of the light inlet surface of the light guide plate;

[0011] wherein the first light bar comprises a plurality of first light emitting devices, the second light bar comprises a plurality of second light emitting devices, and the light emitting color of the first light emitting devices is different from the light emitting color of the second light emitting devices.

[0012] In an embodiment of the present application, the first light bar further comprises a third light emitting device, and the light emitting color of the third light emitting device is different from the light emitting color of the first light emitting device.

[0013] wherein the orthographic projection of the first light emitting device on the back plate and the orthographic projection of the third light emitting device on the back plate are arranged alternately along the length direction of the light inlet surface of the light guide plate.

[0014] In an embodiment of the present application, the second light bar further comprises a fourth light emitting device, the fourth light emitting device has a light emitting color different from the light emitting color of the first light emitting device, and the orthographic projection of the fourth light emitting device on the back plate at least partially overlaps the orthographic projection of the third light emitting device on the back plate.

[0015] The orthographic projection of the second light emitting device on the back plate and the orthographic projection of the fourth light emitting device on the back plate are alternately arranged along the length direction of the light-incident surface of the light guide plate.

[0016] In an embodiment of the present application, the light emitting color of the first light emitting device, the light emitting color of the second light emitting device, the light emitting color of the third light emitting device, and the light emitting color of the fourth light emitting device are all different.

[0017] In an embodiment of the present application, in the adjacent plurality of light emitting devices, at least one first light emitting device, at least one second light emitting device, at least one third light emitting device, and at least one fourth light emitting device form a backlight unit, and a plurality of backlight units are arranged along the length direction of the light-incident surface of the light guide plate.

[0018] The light guide plate comprises a plurality of backlight sub-zones, the plurality of backlight sub-zones are arranged along the length direction of the light-incident surface of the light guide plate, and one backlight sub-zone corresponds to one backlight unit.

[0019] The first light emitting device is configured to emit white light.

[0020] In the first mode, in any one of the backlight units, the first light emitting device emits light, and the second light emitting device, the third light emitting device, and the fourth light emitting device do not emit light.

[0021] In the second mode, in any one of the backlight units, the first light emitting device, the second light emitting device, the third light emitting device, and the fourth light emitting device all emit light.

[0022] In an embodiment of the present application, the light guide plate is provided with a plurality of prism structures on the side away from the back plate, the prism structures extend in the direction perpendicular to the light-incident surface of the light guide plate, and the plurality of prism structures are arranged along the length direction of the light-incident surface of the light guide plate.

[0023] The light guide plate is provided with a plurality of mesh point structures on the side close to the back plate.

[0024] Each backlight sub-zone is provided with a plurality of prism structures and a plurality of mesh point structures.

[0025] In an embodiment of the present application, the second light bar is arranged to overlap the first light bar on the back plate.

[0026] In an embodiment of the present application, the light guide plate has a first face close to the back plate and a second face away from the back plate, and the light inlet face is connected to the first face and the second face.

[0027] The first light bar comprises a first circuit board arranged at the edge of the first face.

[0028] The second light bar comprises a second circuit board arranged at the edge of the second face.

[0029] The first part of the first circuit board overlaps the edge of the light guide plate on the back plate, the second part of the first circuit board is connected to the first part of the first circuit board, the second part of the first circuit board is located outside the projection of the light guide plate on the back plate, and the second part of the first circuit board is provided with a plurality of first light emitting devices; the first part of the second circuit board overlaps the light guide plate on the back plate, the second part of the second circuit board is connected to the first part of the second circuit board, the second part of the second circuit board is located outside the projection of the light guide plate on the back plate, and the second part of the second circuit board is provided with a plurality of second light emitting devices.

[0030] In an embodiment of the present application, the first light emitting device is arranged on the face of the first circuit board close to the second circuit board, and the second light emitting device is arranged on the face of the second circuit board close to the first circuit board.

[0031] In an embodiment of the present application, the projection of the first light emitting device on the back plate at least partially overlaps the projection of the second light emitting device on the back plate.

[0032] In the direction perpendicular to the plane where the back plate is located, the distance between the first light emitting device and the second light emitting device is less than the thickness of the light guide plate, and the distance between the first light emitting device and the second light emitting device is greater than 0.

[0033] In the present application, the backlight module comprises a first light bar and a second light bar, and the two light bars are respectively provided with first light emitting devices and second light emitting devices. Compared with the traditional backlight module, on the one hand, the second light bar comprising a plurality of second light emitting devices added in the present application can improve the light quantity of the light inlet surface of the light guide plate, thereby improving the light quantity of the light outlet surface of the light guide plate, which is the surface of the light guide plate far away from the back plate, so as to further improve the brightness of the display picture and improve the display effect. On the other hand, the light emitting color of the second light emitting device arranged in the second light bar is different from that of the first light emitting device, and the second light emitting device can improve the intensity of the light of the corresponding color in the backlight module, thereby further improving the saturation of the display picture and improving the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is an exploded view of the display device of the present application;

[0035] Figure 2 is a circuit schematic diagram of an embodiment of the display device of the present application;

[0036] Figure 3 is a schematic diagram of a first embodiment of the backlight module of the present application;

[0037] Figure 4 is an exploded view of the backlight module of Figure 3 ;

[0038] Figure 5 is a schematic diagram of a second embodiment of the backlight module of the present application;

[0039] Figure 6 is a schematic diagram of a third embodiment of the backlight module of the present application;

[0040] Figure 7 is a schematic diagram of a fourth embodiment of the backlight module of the present application;

[0041] Figure 8 is a schematic diagram of another view of Figure 7 ;

[0042] Figure 9 is a circuit schematic diagram of Figure 7 . DETAILED DESCRIPTION

[0043] The meanings of the terms used in the present specification and claims correspond to the meanings commonly understood by those of ordinary skill in the art to which the present application belongs. The terms used in the present specification and claims are only for the purpose of facilitating the description and understanding of the present application, and are not intended to limit the present application to the narrow interpretation of the specific terms used in the specification and claims.

[0044] Please refer to Figure 1The present application provides a display device 1000. The display device 1000 can be a mobile phone, a tablet computer, an electronic reader, an electronic display screen, a notebook computer, a mobile phone, an augmented reality (AR) \ virtual reality (VR) device, a media player, a wearable device, a digital camera, a car navigation device, etc. The display device 1000 comprises a display panel 200 and a backlight module 100. The display panel 200 is a liquid crystal display panel 200 (LCD). The backlight module 100 is arranged with its light emitting surface facing the display panel 200.

[0045] In the present application, the backlight module 100 comprises a back plate 10, a light guide plate 20 and a first light bar 30. The light guide plate 20 is arranged on one side of the back plate 10, and one side of the light guide plate 20 is a light inlet surface 22. The first light bar 30 is arranged on one side of the back plate 10, and at least part of the first light bar 30 is located on one side of the light inlet surface 22 of the light guide plate 20.

[0046] Optionally, referring to Figure 1 , the backlight module 100 further comprises a reflective sheet 50, a diffusion sheet 60, a lower light enhancement sheet 70 and an upper light enhancement sheet 80. The reflective sheet 50 is arranged between the back plate 10 and the light guide plate 20. The diffusion sheet 60 is arranged on the side of the light guide plate 20 away from the back plate 10. The lower light enhancement sheet 70 is arranged on the side of the diffusion sheet 60 away from the back plate 10. The upper light enhancement sheet 80 is arranged on the side of the lower light enhancement sheet 70 away from the back plate 10.

[0047] By arranging the reflective sheet 50, the lower light enhancement sheet 70 and the upper light enhancement sheet 80, the light emitting amount of the backlight module 100 can be improved, thereby improving the brightness of the display panel 200 and the display effect. By arranging the diffusion sheet 60, the light emitted by the light guide plate 20 can be more evenly distributed, further improving the display effect.

[0048] Optionally, the backlight module 100 further comprises a second light bar 40, which is arranged on one side of the back plate 10, and at least part of the second light bar 40 is located on one side of the light inlet surface 22 of the light guide plate 20. The first light bar 30 comprises a plurality of first light emitting devices 31, and the second light bar 40 comprises a plurality of second light emitting devices 41. The light emitting color of the first light emitting devices 31 is different from the light emitting color of the second light emitting devices 41.

[0049] In the embodiment, the backlight module 100 comprises a first light bar 30 and a second light bar 40, and the two light bars are respectively provided with first light emitting devices 31 and second light emitting devices 41. Compared with the conventional backlight module 100, on the one hand, the second light bar 40 comprising a plurality of second light emitting devices 41 added in the present application can improve the light quantity of the light inlet surface 22 of the light guide plate 20, thereby improving the light quantity of the light outlet surface of the light guide plate 20, which is the surface of the light guide plate 20 far away from the back plate 10, so as to further improve the brightness of the display picture and improve the display effect. On the other hand, the light emitting color of the second light emitting devices 41 arranged in the second light bar 40 is different from the light emitting color of the first light emitting devices 31, and the second light emitting devices 41 can improve the intensity of the light of the corresponding color in the backlight module 100, thereby further improving the saturation of the display picture and improving the display effect.

[0050] Optionally, the plurality of first light emitting devices 31 are connected in series, and the plurality of second light emitting devices 41 are connected in series.

[0051] Optionally, referring to Figure 2 , the display device 1000 further comprises a light emitting driving chip 300, a first current control chip 400 and a second current control chip 500. The first current control chip 400 is electrically connected with the light emitting driving chip 300, and the first current control chip 400 is electrically connected with the plurality of first light emitting devices 31. The second current control chip 500 is electrically connected with the light emitting driving chip 300, and the second current control chip 500 is electrically connected with the plurality of second light emitting devices 41.

[0052] In the embodiment, the light emitting driving chip 300 (LED Driver IC) can control the plurality of first light emitting devices 31 to emit light at the same time, and control the brightness of the plurality of first light emitting devices 31 through the first current control chip 400. The light emitting driving chip 300 can also control the plurality of second light emitting devices 41 to emit light at the same time, and control the brightness of the plurality of second light emitting devices 41 through the second current control chip 500. In a low gray scale display picture, the light emitting driving chip 300 can turn off the plurality of second light emitting devices 41, and reduce the brightness of the plurality of first light emitting devices 31 through the first current control chip 400, so as to realize the display of the low gray scale display picture. In a high gray scale display picture, the light emitting driving chip 300 can turn on the plurality of first light emitting devices 31 and the plurality of second light emitting devices 41 at the same time, and increase the brightness of the plurality of first light emitting devices 31 and the brightness of the plurality of second light emitting devices 41 through the first current control chip 400 and the second current control chip 500, so as to improve the contrast of the display device 1000 and improve the display effect.

[0053] Optionally, the first light-emitting device 31 and the second light-emitting device 41 can be a light-emitting diode (LED), a sub-millimeter light-emitting diode (Mini LED), or a micro light-emitting diode (Micro LED). Among them, the size of the micro light-emitting diode is smaller, the size of the sub-millimeter light-emitting diode is moderate, and the size of the light-emitting diode is larger. As the size of the first light-emitting device 31 and the second light-emitting device 41 decreases, the number of the first light-emitting device 31 and the second light-emitting device 41 that can be set in a unit space increases, thereby increasing the light output of the backlight module 100, increasing the brightness of the display screen, and improving the display effect.

[0054] Optionally, the first light-emitting device 31 is configured to emit white light, and the second light-emitting device 41 is configured to emit one of red, green, and blue light. When micro-LEDs are used for the first and second light-emitting devices 31 and 41, since the red light emitting efficiency of micro-LEDs is low, to improve the overall saturation of the image, the second light-emitting device 41 can be configured to emit red light, thereby improving the low red light emitting efficiency of the micro-LEDs and enhancing the display quality.

[0055] It should be understood that the portion of white light with a predetermined wavelength has a lower brightness than the remaining portion of the white light, and visible light of different colors has different wavelengths. By adding a second light-emitting device 41 on the basis of the first light-emitting device 31, the intensity of the light of the predetermined wavelength can be increased. The above-mentioned predetermined wavelength can be set according to demand. For example, the predetermined wavelength can be the wavelength corresponding to the color with relatively low luminous intensity within the visible light band emitted by the backlight module 100, thereby increasing the saturation of the picture and thus improving the display effect. The predetermined wavelength can also be light of a color specially set according to the display requirements of the picture, and the luminous color or wavelength range of the second light-emitting device 41 is not limited here.

[0056] Optional, see Figure 3 , the orthographic projection of the second light bar 40 on the back panel 10 overlaps with the orthographic projection of the first light bar 30 on the back panel 10. In this embodiment, by overlapping the first light bar 30 and the second light bar 40, the number of first light-emitting devices 31 and second light-emitting devices 41 per unit space is further increased, thereby increasing the light output intensity of the backlight module 100 and the brightness of the display device 1000, thereby improving the contrast and display effect.

[0057] Optionally, the light guide plate 20 has a first surface close to the back plate 10, a second surface away from the back plate 10, and the light inlet surface 22 is connected to the first surface and the second surface. The first light bar 30 includes a first circuit board 33, and the first circuit board 33 is arranged at the edge of the first surface. The second light bar 40 includes a second circuit board 43, and the second circuit board 43 is arranged at the edge of the second surface.

[0058] The first part of the first circuit board 33 has a projection on the back plate 10, which overlaps the edge of the light guide plate 20 on the back plate 10. The second part of the first circuit board 33 is connected to the first part of the first circuit board 33. The second part of the first circuit board 33 has a projection on the back plate 10, which is located outside the projection of the light guide plate 20 on the back plate 10. The second part of the first circuit board 33 is provided with a plurality of first light emitting devices 31.

[0059] The first part of the second circuit board 43 has a projection on the back plate 10, which overlaps the light guide plate 20. The second part of the second circuit board 43 is connected to the first part of the second circuit board 43. The second part of the second circuit board 43 has a projection on the back plate 10, which is located outside the projection of the light guide plate 20 on the back plate 10. The second part of the second circuit board 43 is provided with a plurality of second light emitting devices 41.

[0060] In this embodiment, the first circuit board 33 and the second circuit board 43 are flexible circuit boards (Flexible Printed Circuit, FPC). In the backlight module 100, the first part of the first circuit board 33 can be fixed to the edge of the light guide plate 20 close to the back plate 10 by an adhesive, and the first part of the second circuit board 43 can be fixed to the edge of the light guide plate 20 away from the back plate 10 by an adhesive. The adhesive can be double-sided tape or optically clear adhesive (Optically Clear Adhesive, OCA). Through the design of fixing the first light emitting device 31 and the second light emitting device 41 by the first circuit board 33 and the second circuit board 43, the space on the side of the light inlet surface 22 of the light guide plate 20 is maximized, so that the space volume that can only be used to set one light emitting device can be used to vertically set two light emitting devices, thereby increasing the number of light emitting devices in a unit space, thereby increasing the light output of the backlight module 100 and the brightness of the display device 1000, thereby improving the display effect.

[0061] Optionally, referring to Figure 4 , the first light emitting device 31 is arranged on the surface of the first circuit board 33 close to the second circuit board 43, and the second light emitting device 41 is arranged on the surface of the second circuit board 43 close to the first circuit board 33.

[0062] In the embodiment, since the first circuit board 33 is arranged at the edge of the first surface of the light guide plate 20, the second circuit board 43 is arranged at the edge of the second surface of the light guide plate 20, the light rays emitted by the first light emitting devices 31 and the second light emitting devices 41 can enter the light guide plate 20 through the light inlet surface 22 of the light guide plate 20 as much as possible by arranging the plurality of first light emitting devices 31 and the plurality of second light emitting devices 41 between the first circuit board 33 and the second circuit board 43, and thus the light emission quantity of the backlight module 100 is improved.

[0063] Optionally, a reflective coating is arranged on the surface of the first circuit board 33 facing the second circuit board 43, and a reflective coating is arranged on the surface of the second circuit board 43 facing the first circuit board 33. The reflective coatings can make the light rays emitted by the first light emitting devices 31 and the second light emitting devices 41 parallel to the light inlet surface 22 be reflected and used again to enter the light inlet surface 22, and thus the light emission quantity of the backlight module 100 is further improved, and the display effect is improved.

[0064] Optionally, the backlight module 100 further comprises a reflective film layer. The reflective film layer is connected to the side of the first circuit board 33 away from the light inlet surface 22 of the light guide plate 20 and the side of the second circuit board 43 away from the light inlet surface 22 of the light guide plate 20, and the reflective film layer is also located on the side of the first light emitting devices 31 and the second light emitting devices 41 away from the light inlet surface 22 of the light guide plate 20. In the embodiment, the reflective film layer can reflect and use again the light rays emitted by the first light emitting devices 31 and the second light emitting devices 41 away from the light guide plate 20 to enter the light inlet surface 22, and thus the light emission quantity of the backlight module 100 is further improved, and the display effect is improved.

[0065] In the first embodiment of the present application:

[0066] Optionally, please refer to Figure 3 , the orthographic projection of the first light emitting devices 31 on the back plate 10 at least partially overlaps the orthographic projection of the second light emitting devices 41 on the back plate 10.

[0067] In the first embodiment of the present application, one first light emitting device 31 can correspond to one second light emitting device 41, and one first light emitting device 31 can correspond to two or more light emitting devices. In some other embodiments, one second light emitting device 41 can also correspond to at least one first light emitting device 31. The correspondence of the first light emitting devices 31 and the second light emitting devices 41 in the embodiment refers to the orthographic projection of the first light emitting devices 31 on the back plate 10 overlapping the orthographic projection of the second light emitting devices 41 on the back plate 10. The embodiment maximizes the use of the space on the side of the light inlet surface 22 of the light guide plate 20, improves the light emission quantity of the backlight module 100, improves the brightness of the display device 1000, and thus improves the display effect.

[0068] Optionally, in the direction perpendicular to the plane where the back plate 10 is located, the interval L1 between the first light emitting device 31 and the second light emitting device 41 is less than the thickness L2 of the light guide plate 20, and the interval L1 between the first light emitting device 31 and the second light emitting device 41 is greater than 0.

[0069] In the first embodiment of the present application, the interval L1 between the first light emitting device 31 and the second light emitting device 41 is greater than 0, which can avoid heat transfer between the first light emitting device 31 and the second light emitting device 41 during light emission, so that the heat accumulated in the first light emitting device 31 and the second light emitting device 41 is not excessive, and the first light emitting device 31 or the second light emitting device 41 is not overheated and burned out. The interval L1 between the first light emitting device 31 is less than the thickness L2 of the light guide plate 20, which can avoid that the thickness of any one of the first light emitting device 31 and the second light emitting device 41 is too small, so that the light distribution of the light inlet surface 22 of the light guide plate 20 is not uniform, and the display effect is affected.

[0070] In the second embodiment of the present application:

[0071] In order to avoid redundancy, the second embodiment of the present application will describe the different parts from the first embodiment of the present application.

[0072] The second embodiment of the present application is different from the first embodiment of the present application in that:

[0073] Optionally, referring to Figure 5 , the orthographic projection of the first light emitting device 31 on the back plate 10 does not overlap with the orthographic projection of the second light emitting device 41 on the back plate 10, and the orthographic projection of the first light emitting device 31 on the back plate 10 and the orthographic projection of the second light emitting device 41 on the back plate 10 are arranged alternately along the length direction D1 of the light inlet surface 22 of the light guide plate 20.

[0074] In the present application, the length direction D1 of the light inlet surface 22 of the light guide plate 20 is the direction perpendicular to the thickness direction of the light guide plate 20 in the plane where the light inlet surface 22 of the light guide plate 20 is located.

[0075] In the second embodiment of the present application, the orthographic projection of the first light-emitting device 31 on the back panel 10 does not overlap with the orthographic projection of the second light-emitting device 41 on the back panel 10, thereby relatively increasing the spacing L1 between adjacent first and second light-emitting devices 31 and 41. This prevents heat transfer between the first and second light-emitting devices 31 and 41 during light emission, which could lead to excessive heat accumulation within the first and second light-emitting devices 31 and 41, causing overheating and burning of the first and second light-emitting devices 31 and 41. This improves the stability of the backlight module 100 and extends the service life of the backlight module 100. While maintaining the heat dissipation performance of the backlight module 100, the second embodiment of the present application alternately arranges the orthographic projections of the first and second light-emitting devices 31 and 41 on the back panel 10 along the longitudinal direction D1 of the light-entering surface 22 of the light guide plate 20. This effectively utilizes the unit volume of the light-entering surface 22 of the light guide plate 20, increases the brightness of the light emitted by the backlight module 100, and thus enhances the display effect.

[0076] Optionally, the spacing L1 between the first light-emitting device 31 and the second light-emitting device 41 in a direction perpendicular to the thickness of the back plate 10 is smaller than the spacing between two adjacent first light-emitting devices 31, and the spacing between the first light-emitting device 31 and the second light-emitting device 41 in a direction perpendicular to the thickness of the back plate 10 is smaller than the spacing between two adjacent second light-emitting devices 41. This further improves the heat dissipation performance of the backlight module 100 and enhances the display effect.

[0077] In the third embodiment of the present application:

[0078] In order to avoid redundancy, the third embodiment of the present application will describe parts that are different from the first embodiment of the present application.

[0079] The third embodiment of the present application is different from the first embodiment of the present application in that:

[0080] Optional, see Figure 6 The first light bar 30 further includes a third light emitting device 32 , and the orthographic projections of the first light emitting device 31 on the back plate 10 and the orthographic projections of the third light emitting device 32 on the back plate 10 are alternately arranged along the length direction D1 of the light incident surface 22 of the light guide plate 20 .

[0081] Compared with the first embodiment of the present application, the third embodiment sets a third light-emitting device 32 between two adjacent first light-emitting devices 31, further increasing the number of light-emitting devices on the light-incoming surface 22 side of the light guide plate 20, thereby increasing the brightness of the display panel 200 and improving the display effect.

[0082] Optionally, the light emitting color of the third light emitting device 32 is different from the light emitting color of the first light emitting device 31 .

[0083] The third light emitting device 32 is configured to emit light of one color among red light, green light and blue light.

[0084] In the third embodiment, by setting the light emitting color of the third light emitting device 32 to be different from the light emitting color of the first light emitting device 31, since the first light emitting device 31 is configured to emit white light, the third light emitting device 32 can improve the intensity of the light of the color corresponding thereto in the backlight module 100, thereby further improving the saturation of the display picture and improving the display effect.

[0085] Optionally, the light emitting color of the first light emitting device 31, the light emitting color of the second light emitting device 41 and the light emitting color of the third light emitting device 32 are all different. In the present embodiment, the setting of the third light emitting device 32 can further improve the saturation of the display picture, thereby improving the display effect.

[0086] Optionally, the display device 1000 further comprises a third current control chip 600. The third current control chip 600 is electrically connected with the light emitting driving chip 300. The third current control chip 600 is electrically connected with the plurality of third light emitting devices 32. The light emitting driving chip 300 can simultaneously control the plurality of third light emitting devices 32 to emit light, and control the brightness of the plurality of third light emitting devices 32 through the third current control chip 600. The brightness and contrast of the display picture are improved, thereby improving the display effect.

[0087] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits red light, and the third light emitting device 32 emits green light.

[0088] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits red light, and the third light emitting device 32 emits blue light.

[0089] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits green light, and the third light emitting device 32 emits blue light.

[0090] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits green light, and the third light emitting device 32 emits red light.

[0091] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits blue light, and the third light emitting device 32 emits red light.

[0092] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits blue light, and the third light emitting device 32 emits green light.

[0093] In the fourth embodiment of the present application:

[0094] In order to avoid redundancy, the fourth embodiment of the present application will describe the different parts from the third embodiment of the present application.

[0095] The fourth embodiment of the present application differs from the third embodiment of the present application in that:

[0096] Optionally, referring to Figure 7 , the second light bar 40 further comprises a fourth light emitting device 42, and the orthographic projection of the fourth light emitting device 42 on the back plate 10 at least partially overlaps the orthographic projection of the third light emitting device 32 on the back plate 10. The orthographic projection of the second light emitting device 41 on the back plate 10 and the orthographic projection of the fourth light emitting device 42 on the back plate 10 are alternately arranged along the length direction D1 of the light-incident surface 22 of the light guide plate 20.

[0097] Compared with the third embodiment of the present application, the fourth embodiment sets the fourth light emitting device 42 between the two adjacent second light emitting devices 41, further increases the number of light emitting devices on the side of the light-incident surface 22 of the light guide plate 20, and thus improves the brightness of the display panel 200 and the display effect.

[0098] Optionally, the light emitting color of the fourth light emitting device 42 is different from the light emitting color of the first light emitting device 31.

[0099] The third light emitting device 32 is configured to emit light of one color of red light, green light and blue light.

[0100] In the fourth embodiment, by setting the light emitting color of the fourth light emitting device 42 to be different from the light emitting color of the first light emitting device 31, since the first light emitting device 31 is configured to emit white light, the fourth light emitting device 42 can improve the intensity of the light of the corresponding color in the backlight module 100, and thus further improve the saturation of the display picture and the display effect.

[0101] Optionally, the light emitting color of the first light emitting device 31, the light emitting color of the second light emitting device 41, the light emitting color of the third light emitting device 32, and the light emitting color of the fourth light emitting device 42 are all different. In the present embodiment, the setting of the fourth light emitting device 42 can further improve the saturation of the display picture, and thus improve the display effect.

[0102] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits red light, the third light emitting device 32 emits green light, and the fourth light emitting device 42 emits blue light.

[0103] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits red light, the third light emitting device 32 emits blue light, and the fourth light emitting device 42 emits green light.

[0104] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits green light, the third light emitting device 32 emits blue light, and the fourth light emitting device 42 emits red light.

[0105] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits green light, the third light emitting device 32 emits red light, and the fourth light emitting device 42 emits blue light.

[0106] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits blue light, the third light emitting device 32 emits green light, and the fourth light emitting device 42 emits red light.

[0107] Optionally, the first light emitting device 31 emits white light, the second light emitting device 41 emits blue light, the third light emitting device 32 emits green light, and the fourth light emitting device 42 emits red light.

[0108] Optionally, please refer to Figure 8 In the adjacent plurality of light emitting devices, at least one first light emitting device 31, at least one second light emitting device 41, at least one third light emitting device 32, and at least one fourth light emitting device 42 form a backlight unit 90, and a plurality of backlight units 90 are arranged along the length direction D1 of the light incident surface 22 of the light guide plate 20.

[0109] As shown in Figure 8 The adjacent six light emitting devices form a backlight unit 90, and each backlight unit 90 includes at least one first light emitting device 31, at least one second light emitting device 41, at least one third light emitting device 32, and at least one fourth light emitting device 42.

[0110] Optionally, the light guide plate 20 includes a plurality of backlight partitions 23, and the plurality of backlight partitions 23 are arranged along the length direction D1 of the light incident surface 22 of the light guide plate 20, and one backlight partition 23 corresponds to one backlight unit 90.

[0111] Optionally, the first light emitting device 31 is configured to emit white light.

[0112] In the first mode:

[0113] In any one backlight unit 90, the first light emitting device 31 emits light, and the second light emitting device 41, the third light emitting device 32, and the fourth light emitting device 42 do not emit light.

[0114] It should be understood that the first mode is a normal working mode, and in the normal working mode, in order to save energy, only the first light emitting device 31 emits white light, and the second light emitting device 41, the third light emitting device 32, and the fourth light emitting device 42 do not emit light.

[0115] In the second mode:

[0116] In any one backlight unit 90, the first light emitting device 31, the second light emitting device 41, the third light emitting device 32, and the fourth light emitting device 42 all emit light.

[0117] It needs to be understood that the second mode is an enhanced display mode. In the enhanced display mode, on the one hand, the luminous intensity of each backlight unit 90 is increased, which can increase the light output of the backlight module 100, thereby improving the display effect. On the other hand, the brightness of red light, the brightness of green light, and the brightness of blue light in each backlight unit 90 are all increased, thereby improving the saturation of the display picture, thereby improving the display effect.

[0118] Optionally, the display device 1000 comprises the light-emitting driving chip 300 and a plurality of backlight current control chips 700. Each backlight current control chip 700 is electrically connected with the light-emitting driving chip 300. Each backlight current control chip 700 controls the current intensity of a plurality of light-emitting devices in a backlight partition 23, and thus each backlight current control chip 700 is electrically connected with the plurality of light-emitting devices in the same backlight partition 23.

[0119] Further, in the second mode, the brightness of the light-emitting devices in the plurality of backlight partitions 23 can be adjusted by the plurality of backlight current control chips 700, respectively, to achieve dynamic color display of the backlight partitions 23, realize rainbow lamp display or dynamic rainbow display, and improve the display effect.

[0120] Please refer to Figure 9 In the first mode, the light-emitting driving chip 300 only drives the first light-emitting device 31 to turn on. In the second mode, the light-emitting driving chip 300 drives a plurality of backlight units 90 to turn on, and the brightness of each backlight partition 23 can be controlled by the plurality of backlight current control chips 700 to achieve dynamic display and improve the display effect.

[0121] Optionally, the light guide plate 20 is provided with a plurality of prism structures 21 away from the back plate 10. The prism structures 21 extend in a direction perpendicular to the light incident surface 22 of the light guide plate 20, and the plurality of prism structures 21 are arranged along the length direction D1 of the light incident surface 22 of the light guide plate 20. The light guide plate 20 is provided with a plurality of screen dot structures close to the back plate 10. Each backlight partition 23 is correspondingly provided with a plurality of prism structures 21 and a plurality of screen dot structures.

[0122] In this embodiment, by providing a plurality of prism structures 21 on the light emitting surface of the light guide plate 20 and screen dot structures on the side of the light guide plate 20 close to the back plate 10, the light emitted by each backlight unit 90 can be converged in the corresponding backlight partition 23, so that the light emitted by each backlight unit 90 propagates in a converging manner in the corresponding backlight partition 23, the amount of light propagating from the backlight unit 90 to the adjacent backlight partition 23 is reduced, the crosstalk between adjacent backlight units 90 is avoided, the picture restoration degree of the display picture is improved, and thus the display effect is improved.

[0123] It can be understood that in some other embodiments, the above-mentioned light-emitting driving chip 300, the first current control chip 400, the second current control chip 500, the third current control chip 600, and the backlight current control chip 700 can also be integrated in the backlight module 100 as a part of the backlight module 100. That is, the backlight module 100 includes the above-mentioned light-emitting driving chip 300, the first current control chip 400, the second current control chip 500, the third current control chip 600, and the backlight current control chip 700.

[0124] The specific implementation of the present application is described in detail above. The above-mentioned embodiments disclosed in the present application are only preferred embodiments of the present application. For those skilled in the art, many modifications and improvements can be made without departing from the concept of the present application. These modifications and improvements all fall within the protection scope defined by the claims of the present application.

Claims

1. A backlight module, characterized in that, The backlight device comprises: a back plate; a light guide plate arranged on one side of the back plate, one side of the light guide plate being a light inlet surface; a first light bar arranged on one side of the back plate, at least part of the first light bar being located on one side of the light inlet surface of the light guide plate; and a second light bar arranged on one side of the back plate, at least part of the second light bar being located on one side of the light inlet surface of the light guide plate. The first light bar comprises a plurality of first light emitting devices and third light emitting devices, the second light bar comprises a plurality of second light emitting devices and fourth light emitting devices, the light emitting color of the first light emitting devices, the light emitting color of the second light emitting devices, the light emitting color of the third light emitting devices, and the light emitting color of the fourth light emitting devices are all different, and the first light emitting devices are configured to emit white light. The orthographic projection of the first light emitting devices on the back plate and the orthographic projection of the third light emitting devices on the back plate are alternately arranged along the length direction of the light inlet surface of the light guide plate. The orthographic projection of the second light emitting devices on the back plate and the orthographic projection of the fourth light emitting devices on the back plate are alternately arranged along the length direction of the light inlet surface of the light guide plate. The orthographic projection of the fourth light emitting devices on the back plate and the orthographic projection of the third light emitting devices on the back plate at least partially overlap. In the adjacent plurality of light emitting devices, at least one first light emitting device, at least one second light emitting device, at least one third light emitting device, and at least one fourth light emitting device form a backlight unit. In the first mode, in any one backlight unit, the first light emitting devices emit light, and the second light emitting devices, the third light emitting devices, and the fourth light emitting devices do not emit light. In the second mode, in any one backlight unit, the first light emitting devices, the second light emitting devices, the third light emitting devices, and the fourth light emitting devices all emit light. The plurality of backlight units are arranged along the length direction of the light inlet surface of the light guide plate.

2. The backlight module of claim 1, wherein, The light guide plate comprises a plurality of backlight sub-zones, and the plurality of backlight sub-zones are arranged along the length direction of the light inlet surface of the light guide plate, and one backlight sub-zone corresponds to one backlight unit. The light guide plate away from the back plate is provided with a plurality of prism structures, the prism structures extend in a direction perpendicular to the light inlet surface of the light guide plate, and the plurality of prism structures are arranged along the length direction of the light inlet surface of the light guide plate.

3. The backlight module of claim 2, wherein, The light guide plate close to the back plate is provided with a plurality of dot structures. Each backlight sub-zone is provided with a plurality of prism structures and a plurality of dot structures. The orthographic projection of the second light bar on the back plate overlaps the orthographic projection of the first light bar on the back plate.

4. The backlight module of any one of claims 1-3, wherein, The light guide plate close to the back plate is a first surface, the light guide plate away from the back plate is a second surface, and the light inlet surface connects the first surface and the second surface.

5. The backlight module of claim 4, wherein, The first light bar comprises a first circuit board, and the first circuit board is arranged at the edge of the first surface. The second light bar comprises a second circuit board, and the second circuit board is arranged at the edge of the second surface. ​ A first portion of the first circuit board overlaps a projection of the light guide plate on the back plate, a second portion of the first circuit board is connected to the first portion of the first circuit board, a projection of the second portion of the first circuit board on the back plate is located outside a projection of the light guide plate on the back plate, and the second portion of the first circuit board is provided with a plurality of the first light emitting devices; A first portion of the second circuit board overlaps the light guide plate on the back plate, a second portion of the second circuit board is connected to the first portion of the second circuit board, a projection of the second portion of the second circuit board on the back plate is located outside a projection of the light guide plate on the back plate, and the second portion of the second circuit board is provided with a plurality of the second light emitting devices.

6. The backlight module of claim 5, wherein, The first light emitting devices are arranged on a side of the first circuit board close to the second circuit board, and the second light emitting devices are arranged on a side of the second circuit board close to the first circuit board.

7. The backlight module of claim 5, wherein the light source is a light emitting diode (LED). A projection of the first light emitting devices on the back plate at least partially overlaps a projection of the second light emitting devices on the back plate; In a direction perpendicular to a plane in which the back plate is located, a distance between the first light emitting devices and the second light emitting devices is less than a thickness of the light guide plate, and the distance between the first light emitting devices and the second light emitting devices is greater than 0.

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