Backlight module and display equipment

Abstract

The embodiment of the utility model discloses a backlight module and display equipment, and relates to the technical field of display. The backlight module comprises a light guide part and a lamp panel. The lamp panel is arranged on the light inlet side of the light guide part and used for emitting light to the light guide part so as to provide backlight for the liquid crystal panel. The lamp panel comprises a circuit board, a white light-emitting unit and a red-green-blue light-emitting unit. The white light-emitting unit comprises a first blue light-emitting chip and a photoluminescence part, and the photoluminescence part is used for converting blue light into white light. The red-green-blue light-emitting unit comprises a plurality of light-emitting chips, the light-emitting chips are arranged in the length direction of the circuit board, and the light-emitting chips comprise the red light-emitting chip, the green light-emitting chip and the second blue light-emitting chip. The long side of at least one light-emitting chip in the red-green-blue light-emitting unit is parallel to the width direction of the circuit board, and the short side of the light-emitting chip is parallel to the length direction of the circuit board. According to the embodiment of the invention, the brightness of the lamp panel can be improved, so that the brightness of the backlight module is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, and in particular, to a backlight module and a display device. BACKGROUND

[0002] The display device can include a backlight module, the backlight module can include a lamp plate, the lamp plate can include a circuit board and a light emitting unit, and the light emitting unit is arranged on the circuit board.

[0003] The light emitting unit can include a plurality of light emitting chips, and the plurality of light emitting chips can include red light emitting chips, green light emitting chips and blue light emitting chips. The red light emitting chips can emit red light, the green light emitting chips can emit green light, and the blue light emitting chips can emit blue light, so that the display device can realize full-color display.

[0004] Generally, the circuit board is strip-shaped, and the long side of the light emitting chip can be parallel to the length direction of the circuit board. That is, the light emitting chip is usually arranged transversely on the circuit board. SUMMARY

[0005] Embodiments of the present application provide a backlight module and a display device, which can improve the brightness of the backlight module and improve the display performance of the display device.

[0006] In one aspect, the embodiments of the present application provide a backlight module. The backlight module includes a light guide member and a lamp plate. The lamp plate is arranged on the light incident side of the light guide member, and the lamp plate is used to emit light to the light guide member to provide backlight for a liquid crystal panel. The lamp plate includes a circuit board and a light emitting unit. The circuit board is strip-shaped. The light emitting unit is arranged on one side of the circuit board along the thickness direction of the circuit board, and the number of the light emitting unit is multiple. The light emitting unit includes a white light emitting unit and a red-green-blue light emitting unit. The white light emitting unit includes a first blue light emitting chip and a photoluminescence part, and the photoluminescence part is arranged on the light emitting side of the first blue light emitting chip, and the photoluminescence part is used to convert blue light into white light. The red-green-blue light emitting unit is arranged on one side of the white light emitting unit along the length direction of the circuit board, and the red-green-blue light emitting unit includes a plurality of light emitting chips, the plurality of light emitting chips are arranged along the length direction of the circuit board, and the plurality of light emitting chips include red light emitting chips, green light emitting chips and second blue light emitting chips. At least one red light emitting chip and one green light emitting chip are arranged between the second blue light emitting chip and the first blue light emitting chip. The long side of at least one light emitting chip in the red-green-blue light emitting unit is parallel to the width direction of the circuit board, and the short side of the light emitting chip is parallel to the length direction of the circuit board. The lamp plate further includes a second dam, the second dam and the light emitting unit are arranged on the same side of the circuit board, and the second dam is used to limit the light emitting direction of the light emitting unit. Along the length direction of the circuit board, the second dam is located between the white light emitting unit and the red-green-blue light emitting unit.

[0007] In the embodiments of the present application, the light-emitting unit is provided with a white light-emitting unit and a red-green-blue light-emitting unit, so that the white light-emitting unit can compensate for the intensity of red light and green light, thereby improving the overall light-emitting efficiency of the light-emitting unit, allowing the display device to have a wider color gamut and higher brightness, and improving the display performance of the display device.

[0008] The long side of at least one light-emitting chip in the red-green-blue light-emitting unit is parallel to the width direction of the circuit board, and the short side of the light-emitting chip is parallel to the length direction of the circuit board, that is, at least one light-emitting chip in the red-green-blue light-emitting unit can be vertically arranged on the circuit board. Compared with the light-emitting chip arranged horizontally on the circuit board, the light-emitting chip arranged vertically on the circuit board can improve the density of the light-emitting chip in the red-green-blue light-emitting unit, thereby reducing the occupied space of the red-green-blue light-emitting unit in the length direction of the circuit board. In this way, more light-emitting units can be arranged on the circuit board along the length direction of the circuit board, thereby improving the brightness of the light bar and the brightness of the backlight module, and improving the display performance of the display device.

[0009] It can be understood that the at least one light-emitting chip in the red-green-blue light-emitting unit is vertically arranged on the circuit board, which reduces the distance between the second blue light-emitting chip and the first blue light-emitting chip, and makes the light emitted by the second blue light-emitting chip more easily irradiate to the photoluminescence part of the white light-emitting unit.

[0010] Therefore, at least one red light-emitting chip and one green light-emitting chip are arranged between the first blue light-emitting chip and the second blue light-emitting chip, so that the red light-emitting chip and the green light-emitting chip can isolate the first blue light-emitting chip and the second blue light-emitting chip, reduce the risk that the light emitted by the second blue light-emitting chip irradiates to the photoluminescence part after the density of the light-emitting chip in the red-green-blue light-emitting unit increases and the distance between the second blue light-emitting chip and the first blue light-emitting chip decreases, and make the white light-emitting unit emit white light with a set intensity.

[0011] In addition, along the length direction of the circuit board, the second dam is arranged between the white light-emitting unit and the red-green-blue light-emitting unit, so that the second dam can reflect the light emitted by the second blue light-emitting chip. It can be understood that the distance between the second dam and the first blue light-emitting chip can be less than the distance between the dam and the second blue light-emitting chip.

[0012] In this way, on the one hand, the influence of the second dam on the light emitted by the second blue light-emitting chip can be reduced, so that the light emitted by the second blue light-emitting chip can fully exit to the liquid crystal panel, thereby improving the performance of the display device in the color gamut. On the other hand, the second dam close to the first blue light-emitting chip can better reduce the influence of the side light of the second blue light-emitting chip and the light reflected by other optical components on the photoluminescence part.

[0013] It can be understood that the light emitting chip generally includes five light emitting surfaces, i.e., four side light emitting surfaces and one top light emitting surface. Among the four side light emitting surfaces, the area of the two side light emitting surfaces parallel to the long side of the light emitting chip is greater than the area of the two side light emitting surfaces parallel to the short side of the light emitting chip. For example, the area of the two side light emitting surfaces parallel to the long side of the light emitting chip is generally twice the area of the two side light emitting surfaces parallel to the short side of the light emitting chip, so that the light emitting intensity of the two side light emitting surfaces parallel to the long side of the light emitting chip is greater than the light emitting intensity of the two side light emitting surfaces parallel to the short side of the light emitting chip.

[0014] When the second blue light emitting chip is vertically arranged on the circuit board, one side light emitting surface parallel to the long side of the light emitting chip is closer to the white light emitting unit than the two side light emitting surfaces parallel to the short side of the light emitting chip. That is, the side light emitting surface with a larger light emitting area is closer to the white light emitting unit than the side light emitting surface with a smaller light emitting area.

[0015] In the embodiments of the present application, not only are the red light emitting chip and the green light emitting chip arranged to isolate the first blue light emitting chip and the second blue light emitting chip, but also the second dam is arranged to reflect the light emitted by the second blue light emitting chip. In this way, even if the second blue light emitting chip is vertically arranged on the circuit board, the blue light emitted by the second blue light emitting chip is not easy to irradiate to the photoluminescence part, reducing the influence of the light emitted by the second blue light emitting chip on the white light emitting unit.

[0016] In some possible implementations, the lamp panel further includes a power supply trace and a driving chip. The power supply trace is arranged on the circuit board and connected with the light emitting unit, and is used to supply power for the light emitting unit. The driving chip and the light emitting unit are arranged on the same side of the circuit board, and the driving chip is connected with the light emitting unit and is used to drive the light emitting unit to emit light. Along the width direction of the circuit board, the power supply trace and the driving chip are respectively arranged on two sides of the light emitting unit.

[0017] In this way, the light emitting unit can be located in the middle region of the circuit board along the width direction of the circuit board, which is beneficial to improve the light emitting effect of the lamp panel, thereby improving the display effect of the display device. In addition, the connection convenience of the light emitting unit, the power supply trace and the driving chip can also be improved.

[0018] In some possible implementation manners, the backlight module further includes a heat dissipation plate, and the heat dissipation plate includes a bottom plate and a side plate. The bottom plate is arranged at the backlight side of the light guide member, and the surface of the bottom plate towards the light guide member is provided with a relief groove. The side plate is arranged at the side of the lamp plate away from the light guide member. The circuit board includes a circuit board body and a protruding portion. The protruding portion is arranged at one side of the circuit board body and connected with the circuit board body along the width direction of the circuit board. The lamp plate further includes a terminal, and the terminal and the light emitting unit are arranged at the same side of the circuit board, and the terminal is arranged at the protruding portion and connected with the power supply wire. At least part of the terminal is embedded in the relief groove along the width direction of the circuit board.

[0019] It can be understood that at least part of the terminal is embedded in the relief groove, so that the terminal and the bottom plate can share space in the width direction of the circuit board, the width of the backlight module in the width direction of the circuit board is reduced, and the thinness of the display device is facilitated.

[0020] In some possible implementation manners, the number of red light emitting chips is two, and the number of green light emitting chips is two. The two green light emitting chips are arranged at the two sides of the two second blue light emitting chips along the length direction of the circuit board. The two red light emitting chips are arranged at the two sides of the two green light emitting chips.

[0021] It can be understood that the red-green-blue light emitting unit includes two red light emitting chips and two green light emitting chips, so that the intensity of red light and green light can be improved, and the brightness of the lamp plate is facilitated to be improved.

[0022] The two green light emitting chips are arranged at the two sides of the second blue light emitting chip, and the two red light emitting chips are arranged at the two sides of the two green light emitting chips, so that the plurality of light emitting chips in the red-green-blue light emitting unit can be arranged in the order of red light emitting chip, green light emitting chip, second blue light emitting chip, green light emitting chip and red light emitting chip, that is, the two red light emitting chips and the two green light emitting chips can be symmetrical relative to the second blue light emitting chip, so that the light mixing effect of red light, green light and blue light in the red-green-blue light emitting unit is facilitated to be improved, and the display performance of the display device can be improved.

[0023] In addition, by adopting the above arrangement manner, one red light emitting chip and one green light emitting chip can be arranged between the second blue light emitting chip and the white light emitting unit, and the other red light emitting chip and the other green light emitting chip can be arranged between the second blue light emitting chip and the white light emitting unit of the other light emitting unit, so that the risk that the blue light emitted by the second blue light emitting chip irradiates to the photoluminescence part is reduced, the white light emitting unit can emit white light with a set intensity, and the display performance of the display device is facilitated to be improved.

[0024] In some possible implementation manners, the number of the second blue light emitting chips is two, and the two second blue light emitting chips are arranged adjacent to each other along the length direction of the circuit board. In this way, the brightness of the blue light emitted by the lamp panel can be improved.

[0025] In some possible implementation manners, along the length direction of the circuit board, the distance between the center of the second blue light emitting chip close to the white light emitting unit and the center of the white light emitting unit in the two second blue light emitting chips is a first distance, and the distance between the centers of any two light emitting chips arranged adjacent to each other in the red-green-blue light emitting unit is a second distance. The ratio of the first distance to the second distance is in a range of 4 to 8.

[0026] The ratio of the first distance to the second distance is in a range of 4 to 8, which can avoid the ratio of the first distance to the second distance being too small (for example, less than 4), that is, the first distance being too small, thereby reducing the risk of the blue light emitted by the second blue light emitting chip irradiating the photoluminescence part, and enabling the white light emitting unit to emit white light of a set intensity, and facilitating improvement of the display performance of the display device.

[0027] In addition, the ratio of the first distance to the second distance is in a range of 4 to 8, which can also avoid the ratio of the first distance to the second distance being too large (for example, greater than 8), that is, the second distance being too small, thereby reducing the mutual influence between the two light emitting chips arranged adjacent to each other in the red-green-blue light emitting unit.

[0028] In some possible implementation manners, along the length direction of the circuit board, the distance between the center of the white light emitting unit and the center of the red light emitting chip arranged adjacent to the white light emitting unit is a third distance, and the third distance is greater than the second distance.

[0029] It can be understood that the red light emitting chip is closer to the white light emitting unit than the second blue light emitting chip. The third distance is greater than the second distance, which facilitates increase of the distance between the second blue light emitting chip and the white light emitting unit, reduces the influence of the blue light emitted by the second blue light emitting chip on the white light emitting unit, enables the white light emitting unit to emit white light of a set intensity, and facilitates improvement of the display performance of the display device.

[0030] In addition, the third distance is greater than the second distance, so that the second distance can be small, and the density of the light emitting chips in the red-green-blue light emitting unit can be improved.

[0031] In some possible implementation manners, along the length direction of the circuit board, the ratio of the width of the white light emitting unit to the width of the red-green-blue light emitting unit is in a range of 0.3 to 1.

[0032] The ratio of the width of the white light emitting unit to the width of the red, green and blue light emitting units is set to be in a range of 0.3 to 1, which can avoid the ratio of the width of the white light emitting unit to the width of the red, green and blue light emitting units being too small (for example, less than 0.3), and ensure the width of the white light emitting unit, thereby ensuring the light emitting intensity of the white light emitting unit, and facilitating the improvement of the light emitting efficiency of the lamp panel.

[0033] In addition, the ratio of the width of the white light emitting unit to the width of the red, green and blue light emitting units is set to be in a range of 0.3 to 1, which can also avoid the ratio of the width of the white light emitting unit to the width of the red, green and blue light emitting units being too large (for example, greater than 1), and ensure the width of the red, green and blue light emitting units, thereby ensuring the light emitting intensity of the red, green and blue light emitting units, and facilitating the widening of the color gamut of the display device.

[0034] In some possible implementation manners, the lamp panel further includes a first barrier, the first barrier and the light emitting units are arranged on the same side of the circuit board, and the first barrier extends along the length direction of the circuit board, and the first barrier is configured to limit the light emitting direction of the light emitting units. The number of the first barriers is two, and the two first barriers are arranged on both sides of the plurality of light emitting units along the width direction of the circuit board.

[0035] The two first barriers are arranged on both sides of the plurality of light emitting units along the width direction of the circuit board, so that the two first barriers can reflect the light emitted by the light emitting units to the area near the light emitting units, thereby increasing the brightness of the area near the light emitting units, and facilitating the improvement of the light utilization rate of the lamp panel.

[0036] In some possible implementation manners, the lamp panel further includes a protection part, the protection part covers the light emitting units, the protection part is a transparent structure, and the first barrier protrudes from the protection part in the direction perpendicular to the circuit board.

[0037] It can be understood that the protection part covers the light emitting units, so that the protection part can protect the light emitting units and reduce the risk of damage to the light emitting units. The first barrier protrudes from the protection part, so that the first barrier can protect the protection part and reduce the risk of damage to the protection part caused by scratching of the protection part and other components (for example, a light guide member).

[0038] In some possible implementation manners, the first barrier protrudes from the light emitting units and the second barrier in the direction perpendicular to the circuit board.

[0039] In this way, the reflection effect of the first barrier on the light can be ensured, and the first barrier can also support other components (for example, a light guide member) and play a role in protecting the light emitting units.

[0040] In some possible implementation manners, the wavelength of the blue light emitted by the first blue light emitting chip is different from the wavelength of the blue light emitted by the second blue light emitting chip.

[0041] The wavelength of the blue light emitted by the first blue light emitting chip is different from the wavelength of the blue light emitted by the second blue light emitting chip, and different intensities of blue light can be emitted by the first blue light emitting chip and the second blue light emitting chip according to different display requirements, thereby improving the applicability of the display device.

[0042] In another aspect, embodiments of the present application provide a display device. The display device comprises the backlight module and the liquid crystal panel as described above. The liquid crystal panel is arranged in the light emitting direction of the light guide of the backlight module.

[0043] The display device provided by the embodiments of the present application comprises the backlight module as described above, and thus has all the beneficial effects as described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A structural schematic diagram of a display device provided by some embodiments of the present application is shown in the figure;

[0045] Figure 2 A structural schematic diagram of a display panel provided by some embodiments of the present application is shown in the figure;

[0046] Figure 3 A structural schematic diagram of a lamp panel provided by some embodiments of the present application is shown in the figure;

[0047] Figure 4 A schematic diagram of the arrangement relationship of a plurality of light emitting chips in a red-green-blue light emitting unit provided by some embodiments of the present application is shown in the figure;

[0048] Figure 5 A structural schematic diagram of a lamp panel provided by some embodiments of the present application is shown in the figure.

[0049] BRIEF DESCRIPTION OF DRAWINGS

[0050] 100 - lamp plate, 110 - circuit board, 111 - circuit board body, 112 - protruding part, 120 - light emitting unit, 130 - white light emitting unit, 131 - first blue light emitting chip, 132 - photoluminescence part, 140 - red green blue light emitting unit, 141 - light emitting chip, 1411 - red light emitting chip, 1412 - green light emitting chip, 1413 - second blue light emitting chip, 151 - first dam, 152 - second dam, 170 - power supply trace, 171 - first power supply trace, 172 - second power supply trace, 180 - driving chip, 190 - terminal, 200 - backlight module, 220 - light guide, 230 - heat sink, 231 - bottom plate, 232 - side plate, 300 - display panel, 310 - back plate, 311 - first sub-plate, 312 - second sub-plate, 320 - liquid crystal panel, 321 - driving circuit layer, 322 - liquid crystal layer, 3221 - liquid crystal molecule, color film - 323, 400 - display device, 410 - shell, H1 - first distance, H2 - second distance, H3 - third distance, H4 - fourth distance, H5 - fifth distance, X - length direction of the circuit board 110, Y - width direction of the circuit board 110, W1 - width of the white light emitting unit 130, W2 - width of the red green blue light emitting unit 140, Q - axis of the red green blue light emitting unit 140. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0052] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or design solutions. Rather, the use of the words such as "exemplary" or "for example" is intended to present relevant concepts in a specific way.

[0053] As used herein, terms such as “equal,” “parallel,” and “perpendicular” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equal items less than or equal to 5% of either one.

[0054] In the embodiments of this application, the directional indications used to explain the structure and movement of different components, such as up, down, left, right, front, and back, are relative. These indications are appropriate when the components are in the positions shown in the figures. However, if the description of the component positions changes, these directional indications will also change accordingly.

[0055] Figure 1 This is a schematic diagram of the structure of a display device provided in some embodiments of this application. For example... Figure 1 As shown, an embodiment of this application provides a display device 400, which has an image display function.

[0056] The display device 400 can be a television, laptop computer, tablet computer, in-vehicle computer, smartphone, and smartwatch, etc. The embodiments of this application do not further limit the specific form of the display device 400.

[0057] In some examples, such as Figure 1 As shown, the display device 400 includes a display panel 300 and a housing 410. The housing 410 is connected to the display panel 300 and protects the display panel 300. Understandably, the display panel 300 is capable of displaying image information.

[0058] Figure 2 This is a schematic diagram illustrating the structure of a display panel provided in some embodiments of this application. In some examples, such as... Figure 2 As shown, the display panel 300 may include a backlight module 200 and a liquid crystal panel 320. Understandably, the backlight module 200 is capable of emitting light.

[0059] In some examples, such as Figure 2 As shown, the backlight module 200 may include a lamp panel 100 and a light guide 220.

[0060] A lamp panel 100 is disposed on the light-incident side of the light guide 220. The lamp panel 100 emits light to the light guide 220 to provide backlight for the LCD panel 320. For example, the LCD panel 320 is disposed in the light-emitting direction of the light guide 220. Understandably, the light guide 220 can guide the light emitted from the lamp panel 100 to the LCD panel 320. For example, the backlight module 200 in which the light guide 220 guides the light can be referred to as an edge-lit backlight module.

[0061] In other examples, the backlight module 200 may not include a light guide. In this case, the liquid crystal panel 320 can be positioned on the light-emitting side of the lamp board 100, so that the light emitted by the light-emitting unit 120 of the lamp board 100 can illuminate the liquid crystal panel 320, that is, the lamp board 100 can provide backlight for the liquid crystal panel 320. For example, a backlight module in which the liquid crystal panel 320 is positioned on the light-emitting side of the lamp board 100 can be called a direct-lit backlight module.

[0062] The embodiments of this application take the backlight module 200 as an example of an edge-lit backlight module, and will continue to illustrate with examples.

[0063] In some examples, such as Figure 2 As shown, the lamp board 100 includes a circuit board 110 and a light-emitting unit 120. The circuit board 110 is strip-shaped, and the light-emitting unit 120 is disposed on one side of the circuit board 110 along the thickness direction of the circuit board 110.

[0064] For example, when the backlight module 200 is a direct-lit backlight module, the lamp board 100 may include multiple circuit boards 110, which may be arranged along the width direction Y and the length direction of the circuit boards 110. When the backlight module 200 is an edge-lit backlight module, the lamp board 100 may include one circuit board 110, or it may include multiple circuit boards 110 arranged along the length direction X of the circuit boards 110.

[0065] The circuit board 110 may include at least one of a printed circuit board (PCB) and a flexible printed circuit (FPC). Taking a PCB as an example, the circuit board 110 may be a single-layer aluminum circuit board. Alternatively, the circuit board 110 may be a multi-layer circuit board, or it may be a copper circuit board. The embodiments of this application do not further limit the specific form of the circuit board 110.

[0066] The light emitting unit 120 is capable of emitting light. For example, the light emitting unit 120 can include a light emitting diode (LED). For example, the light emitting unit 120 can include a micro light emitting diode (Micro LED) or a mini light emitting diode (Mini LED). Embodiments of the present application do not limit the specific form of the light emitting diode included in the light emitting unit 120.

[0067] In some examples, the number of light emitting units 120 is multiple. For example, when the backlight module 200 is a direct type backlight module, the multiple light emitting units 120 can also be arranged on the circuit board 110 along the length direction X of the circuit board 110 and the width direction Y of the circuit board 110. When the backlight module 200 is an edge type backlight module, the multiple light emitting units 120 can be arranged on the circuit board 110 along the length direction X of the circuit board 110.

[0068] It can be understood that the length direction X of the circuit board 110 and the width direction Y of the circuit board 110 are perpendicular. For example, the length direction X of the circuit board 110 and the width direction Y of the circuit board 110 can be perpendicular or approximately perpendicular, that is, the included angle between the length direction X of the circuit board 110 and the width direction Y of the circuit board 110 can be 90°, or 88° or 89°, etc.

[0069] For example, as shown in Figure 2 The liquid crystal panel 320 can include a driving circuit layer 321 and a liquid crystal layer 322 arranged in a stack. The driving circuit layer 321 includes a plurality of driving circuits. For example, the driving circuit can be a thin film transistor (TFT) driving circuit. The liquid crystal layer 322 includes a plurality of liquid crystal molecules 3221. The driving circuit is capable of applying a deflection voltage to the liquid crystal molecules 3221. The liquid crystal molecules 3221 are capable of being deflected under the action of the deflection voltage to transmit or block light.

[0070] Continuing to refer to Figure 2 The liquid crystal panel 320 can also include a color filter 323 arranged on the light exit side of the liquid crystal layer 322. The color filter 323 can be provided with red, green and blue pixels. The red pixel is capable of transmitting red light, the green pixel is capable of transmitting green light, and the blue pixel is capable of transmitting blue light.

[0071] It can be understood that by controlling the deflection angle of the liquid crystal molecules 3221, red, green and blue light of different intensities can be transmitted through the color filter 323, so that the display panel 300 can realize full-color display.

[0072] The liquid crystal panel 320 can further include an optical film layer (not shown in the figure) which can be arranged on the light-incoming side of the liquid crystal layer 322. The optical film layer can include prisms for enhancing brightness and light-uniformizing films for uniformizing light.

[0073] Alternatively, the optical film layer can also include other film layers in addition to prisms and light-uniformizing films, and the specific form of the optical film layer is not limited by the embodiments of the present application. The lamp panel 100 of the backlight module 200 is exemplified below.

[0074] Figure 3 A structural schematic diagram of the lamp panel provided by some embodiments of the present application is shown. In some examples, as shown in Figure 3 The light-emitting unit 120 includes a white light-emitting unit 130 and a red-green-blue light-emitting unit 140. It can be understood that the white light-emitting unit 130 can emit white light, and the red-green-blue light-emitting unit 140 can emit red light, green light and blue light.

[0075] The arrangement of the light-emitting unit 120 including the white light-emitting unit 130 and the red-green-blue light-emitting unit 140 enables the white light-emitting unit 130 to compensate for the intensity of red light and green light, thereby improving the overall light-emitting efficiency of the light-emitting unit 120, and enabling the display device 400 to have a wider color gamut and higher brightness, thereby improving the display performance of the display device 400.

[0076] Continuing to refer to Figure 3 In some examples, the white light-emitting unit 130 includes a first blue light-emitting chip 131 and a photoluminescence part 132 arranged on the light-emitting side of the first blue light-emitting chip 131, and the photoluminescence part 132 is used to convert blue light into white light.

[0077] It can be understood that the first blue light-emitting chip 131 can emit blue light, and the blue light emitted by the first blue light-emitting chip 131 can irradiate the photoluminescence part 132, and the photoluminescence part 132 can convert the blue light into white light.

[0078] In examples, the first blue light-emitting chip 131 can include a light-emitting chip body for emitting blue light and a pin arranged on one side of the light-emitting chip body and connected with the light-emitting chip body, and the pin is used to connect with the circuit board 110. The pin can include an anode pin and a cathode pin, and the anode pin and the cathode pin are arranged at intervals.

[0079] The photoluminescence part 132 can coat the light-emitting chip body of the first blue light-emitting chip 131, or the photoluminescence part 132 can also be arranged on the side of the light-emitting chip body of the first blue light-emitting chip 131 away from the pin of the first blue light-emitting chip 131.

[0080] For example, the photo-luminescence unit 132 can include a photo-luminescence body and conversion particles, the conversion particles are arranged in the photo-luminescence body, and the conversion particles are used to convert blue light into white light. The conversion particles can include at least one of a fluorescent powder and a yttrium aluminum garnet (YAG) powder, and embodiments of the present application do not make further limitations on the specific form of the conversion particles and the concentration of the conversion particles in the photo-luminescence body, etc.

[0081] With reference to the foregoing Figure 3 In some examples, the red-green-blue light-emitting unit 140 is arranged on one side of the white light-emitting unit 130 along the length direction X of the circuit board 110, and the red-green-blue light-emitting unit 140 includes a plurality of light-emitting chips 141 arranged along the length direction X of the circuit board 110. That is, the white light-emitting unit 130 and the plurality of light-emitting chips 141 in the red-green-blue light-emitting unit 140 can be arranged along the length direction X of the circuit board 110.

[0082] Figure 4 The arrangement relationship of the plurality of light-emitting chips in the red-green-blue light-emitting unit provided by some embodiments of the present application is shown in the schematic view.

[0083] In some examples, as shown in Figure 3 and Figure 4 , the plurality of light-emitting chips 141 include a red light-emitting chip 1411, a green light-emitting chip 1412, and a second blue light-emitting chip 1413. It can be understood that the red light-emitting chip 1411 can emit red light, the green light-emitting chip 1412 can emit green light, and the second blue light-emitting chip 1413 can emit blue light.

[0084] With reference to the foregoing Figure 3 and Figure 4 In some examples, the long side of the first blue light-emitting chip 131 is parallel to the width direction of the circuit board 110, and the short side of the first blue light-emitting chip 131 is parallel to the length direction of the circuit board 110. In this way, the white light-emitting unit 130 can be arranged in a smaller space along the length direction X of the circuit board 110.

[0085] The long side of at least one light-emitting chip 141 in the red-green-blue light-emitting unit 140 is parallel to the width direction of the circuit board 110, and the short side of the light-emitting chip 141 is parallel to the length direction of the circuit board 110. In this way, the density of the light-emitting chips 141 in the red-green-blue light-emitting unit 140 can be improved, and the red-green-blue light-emitting unit 140 can be arranged in a smaller space along the length direction X of the circuit board 110.

[0086] In this way, more light-emitting units 120 can be arranged on the circuit board 110 along the length direction X of the circuit board 110, the brightness of the lamp panel 100 can be improved, and the brightness of the backlight module 200 can be improved, thereby improving the display performance of the display device 400.

[0087] In some examples, at least one red light-emitting chip 1411 and one green light-emitting chip 1412 are arranged between the second blue light-emitting chip 1413 and the first blue light-emitting chip 131.

[0088] It can be understood that one red light-emitting chip 1411 or multiple red light-emitting chips 1411 can be arranged between the second blue light-emitting chip 1413 and the first blue light-emitting chip 131. One green light-emitting chip 1412 or multiple green light-emitting chips 1412 can be arranged between the second blue light-emitting chip 1413 and the first blue light-emitting chip 131.

[0089] In some examples, as shown in Figure 3 and Figure 4 The number of red light-emitting chips 1411 is two, and the number of green light-emitting chips 1412 is two.

[0090] Along the length direction X of the circuit board 110, two green light-emitting chips 1412 are arranged on both sides of the second blue light-emitting chip 1413, and two red light-emitting chips 1411 are arranged on both sides of the two green light-emitting chips 1412.

[0091] It can be understood that the red-green-blue light-emitting unit 140 includes two red light-emitting chips 1411 and two green light-emitting chips 1412, which can improve the intensity of red light and green light, thereby improving the brightness of the lamp panel 100.

[0092] The two green light-emitting chips 1412 are arranged on both sides of the second blue light-emitting chip 1413, and the two red light-emitting chips 1411 are arranged on both sides of the two green light-emitting chips 1412, so that the multiple light-emitting chips 141 in the red-green-blue light-emitting unit 140 can be arranged in the order of red light-emitting chip 1411, green light-emitting chip 1412, second blue light-emitting chip 1413, green light-emitting chip 1412, and red light-emitting chip 1411, that is, the two red light-emitting chips 1411 and the two green light-emitting chips 1412 can be arranged symmetrically with respect to the axis Q of the red-green-blue light-emitting unit 140, thereby improving the light mixing effect of red light, green light, and blue light in the red-green-blue light-emitting unit 140, and improving the display performance of the display device 400.

[0093] It can be understood that, as shown in Figure 3As shown, two green light emitting chips 1412 are respectively arranged on the two sides of the second blue light emitting chip 1413, and two red light emitting chips 1411 are respectively arranged on the two sides of the two green light emitting chips 1412, so that one red light emitting chip 1411 and one green light emitting chip 1412 can be arranged between the second blue light emitting chip 1413 and the first blue light emitting chip 131, and the other red light emitting chip 1411 and the other green light emitting chip 1412 can be arranged between the second blue light emitting chip 1413 and the first blue light emitting chip 131 of the other light emitting unit 120, so that the red light emitting chip 1411 and the green light emitting chip 1412 can isolate the second blue light emitting chip 1413 and the white light emitting unit 130, reduce the risk of blue light emitted by the second blue light emitting chip 1413 irradiating to the photoluminescence part 132, so that the white light emitting unit 130 can emit white light of a set intensity, which is beneficial to improve the display performance of the display device 400.

[0094] That is, along the length direction X of the circuit board 110, two green light emitting chips 1412 are respectively arranged on the two sides of the second blue light emitting chip 1413, and two red light emitting chips 1411 are respectively arranged on the two sides of the two green light emitting chips 1412, so that the red light emitting chip 1411 and the green light emitting chip 1412 can isolate the second blue light emitting chip 1413 and the first blue light emitting chip 131, reduce the risk of blue light emitted by the second blue light emitting chip 1413 irradiating to the photoluminescence part 132 of the white light emitting unit 130, that is, reduce the influence of the blue light emitted by the second blue light emitting chip 1413 on the white light emitting unit 130, so that the white light emitting unit 130 can emit white light of a set intensity, which is beneficial to improve the display performance of the display device 400.

[0095] In addition, two green light emitting chips 1412 are respectively arranged on the two sides of the second blue light emitting chip 1413, and two red light emitting chips 1411 are respectively arranged on the two sides of the two green light emitting chips 1412, which can improve the uniformity of the arrangement of light emitting chips 141 of different colors in the red-green-blue light emitting unit 140, which is beneficial to improve the light mixing effect of red light, green light and blue light, reduce the risk of color separation of the light emitting unit 120, and thus improve the display performance of the display device 400.

[0096] In other examples, two red light emitting chips 1411 can be respectively arranged on the two sides of the second blue light emitting chip 1413, and two green light emitting chips 1412 can be respectively arranged on the two sides of the two red light emitting chips 1411.

[0097] In some examples, as shown in FIG. 1A, Figure 4 As shown, the number of second blue light emitting chips 1413 can be one, and in other examples, as shown in FIG. 1B, Figure 3As shown, the number of the second blue light emitting chips 1413 can also be two, and the two second blue light emitting chips 1413 are arranged adjacent to each other along the length direction X of the circuit board 110. In this way, the brightness of the blue light emitted by the lamp panel 100 can be improved.

[0098] In some examples, the red-green-blue light emitting unit 140 can also include three light emitting chips 141, which include one red light emitting chip 1411, one green light emitting chip 1412, and one second blue light emitting chip 1413. For example, the red light emitting chip 1411 and the green light emitting chip 1412 can be arranged on the two sides of the second blue light emitting chip 1413, respectively, to isolate the second blue light emitting chip 1413 from the first blue light emitting chip 131.

[0099] Embodiments of the present application take the red-green-blue light emitting unit 140 including two red light emitting chips 1411, two green light emitting chips 1412, and two second blue light emitting chips 1413, and the two green light emitting chips 1412 are arranged on the two sides of the two second blue light emitting chips 1413, and the two red light emitting chips 1411 are arranged on the two sides of the two green light emitting chips 1412 as an example, and the embodiments of the present application will be further described by taking the example.

[0100] In some examples, the wavelength of the blue light emitted by the first blue light emitting chip 131 is different from the wavelength of the blue light emitted by the second blue light emitting chip 1413.

[0101] For example, the wavelength of the blue light emitted by the first blue light emitting chip 131 can be greater than the wavelength of the blue light emitted by the second blue light emitting chip 1413, or the wavelength of the blue light emitted by the first blue light emitting chip 131 can be less than the wavelength of the blue light emitted by the second blue light emitting chip 1413.

[0102] For example, the wavelength range of the blue light emitted by the first blue light emitting chip 131 can be 455 nanometers (unit: nm) ~ 460 nm, and the wavelength range of the blue light emitted by the second blue light emitting chip 1413 can be 440 nm ~ 455 nm. Alternatively, the wavelength range of the blue light emitted by the first blue light emitting chip 131 can be 440 nm ~ 455 nm, and the wavelength range of the blue light emitted by the second blue light emitting chip 1413 can be 455 nm ~ 460 nm.

[0103] Alternatively, the first blue light emitting chip 131 and the second blue light emitting chip 1413 can also emit blue light with a wavelength in other wavelength ranges, and the embodiments of the present application do not make further limitations on the wavelength range of the blue light emitted by the first blue light emitting chip 131 and the second blue light emitting chip 1413.

[0104] The wavelength range of the blue light emitted by the first blue light emitting chip 131 is 455nm-460nm, and the wavelength range of the blue light emitted by the second blue light emitting chip 1413 is 440nm-455nm. For example, when the display requirement is a wide color gamut, the luminous intensity of the first blue light emitting chip 131 can be controlled to be less than the luminous intensity of the second blue light emitting chip 1413, so that the light emitting unit 120 can emit stronger short-wavelength blue light to widen the color gamut.

[0105] When the display requirement is eye protection, the luminous intensity of the first blue light emitting chip 131 can be controlled to be greater than the luminous intensity of the second blue light emitting chip 1413, so that the light emitting unit 120 can emit stronger long-wavelength blue light to play an eye protection role.

[0106] It can be understood that after the blue light irradiates the photoluminescence part 132, red light and green light can be excited, the red light and the green light are mixed into yellow light, and the yellow light and the blue light are mixed, so that the white light emitting unit 130 can emit white light. That is, when the wavelength of the blue light emitted by the first blue light emitting chip 131 is longer, the white light emitted by the white light emitting unit 130 can contain blue light with a longer wavelength, so as to play an eye protection role.

[0107] That is, the wavelength of the blue light emitted by the first blue light emitting chip 131 is different from the wavelength of the blue light emitted by the second blue light emitting chip 1413. Different intensities of blue light can be controlled according to different display requirements, which improves the applicability of the display device 400.

[0108] For example, the wavelength range of the red light emitted by the red light emitting chip 1411 can be 630nm-650nm. Alternatively, the red light emitting chip 1411 can also emit red light in other wavelength ranges. The wavelength range of the green light emitted by the green light emitting chip 1412 can be 500nm-570nm. Alternatively, the green light emitting chip 1412 can also emit green light in other wavelength ranges. The embodiments of the present application do not make further limitations on the wavelength range of the red light emitted by the red light emitting chip 1411 and the wavelength range of the green light emitted by the green light emitting chip 1412.

[0109] For example, the first blue light emitting chip 131, the red light emitting chip 1411, the green light emitting chip 1412, and the second blue light emitting chip 1413 can be arranged on the circuit board 110 in a flip-chip manner. The first blue light emitting chip 131, the red light emitting chip 1411, the green light emitting chip 1412, and the second blue light emitting chip 1413 can be packaged in a chip scale package (CSP) manner.

[0110] It can be understood that the chip packaged in the CSP mode has a small volume, which is beneficial to increase the number of the first blue light emitting chip 131, the red light emitting chip 1411, the green light emitting chip 1412 and the second blue light emitting chip 1413 on the circuit board 110, so as to improve the brightness of the backlight module 200.

[0111] Alternatively, the first blue light emitting chip 131, the red light emitting chip 1411, the green light emitting chip 1412 and the second blue light emitting chip 1413 can also be packaged in a package on board (POB) mode.

[0112] The packaging modes of the first blue light emitting chip 131, the red light emitting chip 1411, the green light emitting chip 1412 and the second blue light emitting chip 1413 can be the same or different. The embodiments of the present application do not make further limitation on the packaging modes of the first blue light emitting chip 131, the red light emitting chip 1411, the green light emitting chip 1412 and the second blue light emitting chip 1413.

[0113] Continuing to refer to Figure 3 In some examples, the lamp panel 100 further comprises a first dam 151, the first dam 151 and the light emitting unit 120 are arranged on the same side of the circuit board 110, and the first dam 151 extends along the length direction X of the circuit board 110. The first dam 151 is used to limit the light emitting direction of the light emitting unit 120.

[0114] The number of the first dam 151 is two, and the two first dams 151 are arranged on both sides of the plurality of light emitting units 120 along the width direction Y of the circuit board 110.

[0115] For example, the first dam 151 can comprise a first dam body and a first reflective layer, the first reflective layer is coated on the side of the first dam body close to the light emitting unit 120, so that the first dam 151 can reflect light, thereby enabling the first dam 151 to limit the light emitting direction of the light emitting unit 120. Alternatively, the first dam 151 can comprise a first dam body and first reflective particles, the first reflective particles are arranged in the first dam body. The first reflective particles can comprise metal scraps for reflecting light, thereby enabling the first dam 151 to limit the light emitting direction of the light emitting unit 120.

[0116] The material of the first dam body can comprise silicone or epoxy resin, and the embodiments of the present application do not make further limitation on the material of the first dam body.

[0117] It can be understood that the two first barriers 151 are arranged on both sides of the plurality of light emitting units 120 along the width direction Y of the circuit board 110, so that the two first barriers 151 can reflect the light emitted by the light emitting units 120 to the area near the light emitting units 120, thereby increasing the brightness of the area near the light emitting units 120, and facilitating to improve the light utilization rate of the lamp panel 100.

[0118] For example, along the length direction X of the circuit board 110, the length of the first barrier 151 can be greater than the length of the arrangement of the plurality of light emitting units 120, or along the length direction X of the circuit board 110, the length of the first barrier 151 can be approximately equal to the length of the arrangement of the plurality of light emitting units 120. In this way, the light emitted by the light emitting units 120 arranged at different positions along the length direction X of the circuit board 110 can be reflected by the first barrier 151, so as to improve the light utilization rate of the lamp panel 100.

[0119] Continuing to refer to Figure 3 In some examples, the lamp panel 100 further includes a second barrier 152, the second barrier 152 and the light emitting unit 120 are arranged on the same side of the circuit board 110, and the second barrier 152 is used to limit the light emitting direction of the light emitting unit 120.

[0120] Along the length direction X of the circuit board 110, the second barrier 152 is located between the white light emitting unit 130 and the red-green-blue light emitting unit 140.

[0121] For example, the second barrier 152 can include a second barrier body and a second reflective layer, the second reflective layer is coated on the side of the second barrier body close to the light emitting unit 120, so that the second barrier 152 can reflect light, thereby enabling the second barrier 152 to limit the light emitting direction of the light emitting unit 120. Alternatively, the second barrier 152 can include a second barrier body and second reflective particles, and the second reflective particles are arranged in the second barrier body. The second reflective particles can include metal scraps for reflecting light, thereby enabling the second barrier 152 to limit the light emitting direction of the light emitting unit 120.

[0122] The material of the second barrier body can include silicone or epoxy resin, and the like, and the embodiments of the present application do not make further limitation on the material of the second barrier body. The material of the second barrier body and the material of the first barrier body can be the same or different.

[0123] Along the length direction X of the circuit board 110, the second barrier 152 is located between the white light emitting unit 130 and the red-green-blue light emitting unit 140, which can reduce the risk of blue light emitted by the red-green-blue light emitting unit 140 irradiating to the photoluminescence part 132, so that the white light emitting unit 130 can emit white light of a set intensity, and facilitate to improve the display performance of the display device 400.

[0124] For example, the second dam 152 can be connected with the first dam 151 along the width direction Y of the circuit board 110, so as to ensure the reflection effect of the second dam 152 on the light, and reduce the risk of the blue light emitted by the red-green-blue light emitting unit 140 irradiating to the photoluminescence part 132.

[0125] In some examples, the first dam 151 protrudes from the light emitting unit 120 and the second dam 152 in a direction perpendicular to the circuit board 110.

[0126] It can be understood that the direction perpendicular to the circuit board 110 is the thickness direction of the circuit board 110, and the thickness direction of the circuit board 110 is perpendicular or approximately perpendicular to the plane where the length direction X of the circuit board 110 and the width direction Y of the circuit board 110 are located. That is, the included angle between the thickness direction of the circuit board 110 and the plane where the length direction X of the circuit board 110 and the width direction Y of the circuit board 110 are located can be 90°, or 88° or 89°.

[0127] The first dam 151 protrudes from the light emitting unit 120 and the second dam 152 in a direction perpendicular to the circuit board 110, which not only ensures the reflection effect of the first dam 151 on the light, but also enables the first dam 151 to support other components (for example, the light guide 220) and play a role in protecting the light emitting unit 120.

[0128] For example, the second dam 152 can protrude from the light emitting unit 120 in a direction perpendicular to the circuit board 110, so as to ensure the reflection effect of the second dam 152 on the light. Alternatively, the second dam 152 can be flush or approximately flush with the light emitting unit 120 (for example, the white light emitting unit 130) in a direction perpendicular to the circuit board 110.

[0129] For example, the height of the second dam 152 in a direction perpendicular to the circuit board 110 can be 0.4 mm (unit: mm) to 1.5 mm. For example, the height of the second dam 152 in a direction perpendicular to the circuit board 110 can be 0.5 mm, 1 mm, or 1.2 mm, and the embodiments of the present application do not make further limitations on the height of the second dam 152.

[0130] In some examples, the lamp panel 100 further comprises a protection part (not shown in the figure), the protection part covers the light emitting unit 120, and the protection part is a transparent structure. The first dam 151 protrudes from the protection part in a direction perpendicular to the circuit board 110.

[0131] For example, the material of the protection part can include silicone, or the protection part can also include other materials, and the embodiments of the present application do not make further limitations on the material of the protection part.

[0132] The protection portion covers the light-emitting unit 120, so that the protection portion can protect the light-emitting unit 120 and reduce the risk of damage to the light-emitting unit 120. The protection portion is a transparent structure, which can reduce the shielding of the protection portion to light. The first dam 151 protrudes from the protection portion, so that the first dam 151 can protect the protection portion and reduce the risk of damage to the protection portion caused by scratching of the protection portion and other components (for example, the light guide 220).

[0133] For example, along the length direction X of the circuit board 110, the protection portion can be arranged on both sides of the second dam 152. Alternatively, the protection portion can also cover the second dam 152. Embodiments of the present application do not further limit the positional relationship between the protection portion and the second dam 152.

[0134] As described above, along the length direction X of the circuit board 110, the plurality of light-emitting chips 141 in the red-green-blue light-emitting unit 140 can be arranged in the order of the red light-emitting chip 1411, the green light-emitting chip 1412, the second blue light-emitting chip 1413, the second blue light-emitting chip 1413, the green light-emitting chip 1412, and the red light-emitting chip 1411.

[0135] In some examples, as shown in FIG. 1B, along the length direction X of the circuit board 110, the ratio of the width W1 of the white light-emitting unit 130 to the width W2 of the red-green-blue light-emitting unit 140 is in the range of 0.3 to 1. Figure 3

[0136] It can be understood that setting the ratio of the width W1 of the white light-emitting unit 130 to the width W2 of the red-green-blue light-emitting unit 140 in the range of 0.3 to 1 can avoid the ratio of the width W1 of the white light-emitting unit 130 to the width W2 of the red-green-blue light-emitting unit 140 being too small (for example, less than 0.3), and ensure the width of the white light-emitting unit 130, thereby ensuring the light-emitting intensity of the white light-emitting unit 130 and facilitating improvement of the light-emitting efficiency of the lamp panel 100.

[0137] In addition, setting the ratio of the width W1 of the white light-emitting unit 130 to the width W2 of the red-green-blue light-emitting unit 140 in the range of 0.3 to 1 can avoid the ratio of the width W1 of the white light-emitting unit 130 to the width W2 of the red-green-blue light-emitting unit 140 being too large (for example, greater than 1), and ensure the width of the red-green-blue light-emitting unit 140, thereby ensuring the light-emitting intensity of the red-green-blue light-emitting unit 140 and facilitating widening of the color gamut of the display device 400.

[0138] ​For example, the ratio of the width W1 of the white light unit 130 to the width W2 of the RGB light unit 140 along the length direction X of the circuit board 110 can be 0.35, 0.4, 0.5, 0.8, or 0.9, and the like. Embodiments of the present application do not limit the ratio of the width W1 of the white light unit 130 to the width W2 of the RGB light unit 140.

[0139] For example, the width W1 of the white light unit 130 along the length direction X of the circuit board 110 can be 1 mm, and the width of the RGB light unit 140 can be 2.294 mm. The ratio of the width W1 of the white light unit 130 to the width W2 of the RGB light unit 140 is about 0.44.

[0140] Alternatively, the width W1 of the white light unit 130 and the width W2 of the RGB light unit 140 can also have other values. Embodiments of the present application do not limit the values of the width W1 of the white light unit 130 and the width W2 of the RGB light unit 140.

[0141] For example, the widths of the plurality of light emitting chips 141 in the RGB light unit 140 along the length direction X of the circuit board 110 can be equal or approximately equal. For example, the width of the light emitting chip 141 along the length direction X of the circuit board 110 can be 0.274 mm.

[0142] Continuing to refer to Figure 3 In some examples, the distance between the center of the second blue light chip 1413 close to the white light unit 130 and the center of the white light unit 130 is a first distance H1, and the distance between the centers of any two adjacent light emitting chips 141 in the RGB light unit 140 is a second distance H2. The ratio of the first distance H1 to the second distance H2 ranges from 4 to 8.

[0143] For example, the distance between the centers of any two adjacent light emitting chips 141 in the RGB light unit 140 can be equal or approximately equal.

[0144] It can be understood that setting the ratio of the first distance H1 to the second distance H2 to range from 4 to 8 can avoid the ratio of the first distance H1 to the second distance H2 being too small (e.g., less than 4), that is, avoiding the first distance H1 being too small, reducing the risk of the blue light emitted by the second blue light chip 1413 irradiating the photoluminescence part 132, so that the white light unit 130 can emit white light of a set intensity, which is beneficial to improve the display performance of the display device 400.

[0145] In addition, the ratio of the first distance H1 and the second distance H2 is set to be in a range of 4-8, which can avoid the ratio of the first distance H1 and the second distance H2 being too large (for example, greater than 8), that is, the second distance H2 being too small, and reduce the mutual influence between any two light emitting chips 141 in the red-green-blue light emitting unit 140.

[0146] For example, the ratio of the first distance H1 and the second distance H2 can be 4.5, 5, 6, or 7, and the like. The embodiments of the present application do not limit the ratio of the first distance H1 and the second distance H2.

[0147] For example, the first distance H1 can be 2.245 mm, the second distance H2 can be 0.404, and the ratio of the first distance H1 and the second distance H2 is about 5.57. Alternatively, the first distance H1 and the second distance H2 can also be other values, and the embodiments of the present application do not limit the values of the first distance H1 and the second distance H2.

[0148] Continuing to refer to Figure 3 In some examples, the distance between the center of the white light emitting unit 130 and the center of the red light emitting chip 1411 adjacent to the white light emitting unit 130 is a third distance H3, and the third distance H3 is greater than the second distance H2.

[0149] It can be understood that the red light emitting chip 1411 is closer to the white light emitting unit 130 than the second blue light emitting chip 1413. The third distance H3 is set to be greater than the second distance H2, which is beneficial to increase the distance between the second blue light emitting chip 1413 and the white light emitting unit 130, reduce the influence of the blue light emitted by the second blue light emitting chip 1413 on the white light emitting unit 130, and enable the white light emitting unit 130 to emit white light of a set intensity, thereby improving the display performance of the display device 400.

[0150] In addition, the third distance H3 is set to be greater than the second distance H2, so that the second distance H2 can be small, which is beneficial to improve the density of the light emitting chips 141 in the red-green-blue light emitting unit 140.

[0151] For example, as shown in Figure 3 As shown in FIG. 6, along the length direction X of the circuit board 110, the distance between the side of the first blue light emitting chip 131 close to the red light emitting chip 1411 and the side of the red light emitting chip 1411 close to the first blue light emitting chip 131 is a fifth distance H5.

[0152] The distance between any two adjacent light emitting chips 141 in the red-green-blue light emitting unit 140 along the length direction X of the circuit board 110 is a fourth distance H4. Taking the green light emitting chip 1412 and the red light emitting chip 1411 as an example, the distance between the side of the green light emitting chip 1412 close to the red light emitting chip 1411 and the side of the red light emitting chip 1411 close to the green light emitting chip 1412 along the length direction X of the circuit board 110 is the fourth distance H4.

[0153] It can be understood that the fourth distance H4 between any two adjacent light emitting chips 141 is equal.

[0154] In some examples, the fifth distance H5 is greater than the fourth distance H4. In this way, the distance between the second blue light emitting chip 1413 and the white light emitting unit 130 can be increased, and the influence of the blue light emitted by the second blue light emitting chip 1413 on the white light emitting unit 130 is reduced, so that the white light emitting unit 130 can emit white light of a set intensity, and the display performance of the display device 400 is improved.

[0155] In addition, it is also beneficial to reduce the distance between any two adjacent light emitting chips 141 in the red-green-blue light emitting unit 140, so that the number of light emitting chips 141 arranged on the circuit board 110 can be increased, and the brightness of the backlight module 200 is improved.

[0156] It can be understood that the fifth distance H5 is greater than the width of the second dam 152 along the length direction X of the circuit board 110, so that the second dam 152 can be arranged in the white light emitting unit 130 and the red-green-blue light emitting unit 140.

[0157] For example, the value of the fifth distance H5 can be 0.8 mm, and the value of the fourth distance H4 can be 0.13 mm. Alternatively, the values of the fifth distance H5 and the fourth distance H4 can also be other values, and the embodiments of the present application do not make further limitations on the values of the fifth distance H5 and the fourth distance H4.

[0158] Figure 5 The structural schematic diagram of the lamp plate provided by some embodiments of the present application is shown. In some examples, as shown in Figure 5 The lamp plate 100 further includes a power supply wire 170, which is arranged on the circuit board 110 and connected with the light emitting unit 120. The power supply wire 170 is used to supply power for the light emitting unit.

[0159] The power supply wires 170 can include a first power supply wire 171 and a second power supply wire 172, which are arranged along the width direction Y of the circuit board 110. The first power supply wire 171 can be closer to the light emitting unit 120 than the second power supply wire 172, or the first power supply wire 171 can be farther from the light emitting unit 120 than the second power supply wire 172.

[0160] The first power supply wire 171 can be connected to the first blue light emitting chip 131, the second blue light emitting chip 1413, and the green light emitting chip 1412, and can supply power to the first blue light emitting chip 131, the second blue light emitting chip 1413, and the green light emitting chip 1412. The second power supply wire can be connected to the red light emitting chip 1411, and can supply power to the red light emitting chip 1411.

[0161] It can be understood that arranging the first power supply wire 171 to supply power to the blue light emitting chips (including the first blue light emitting chip 131 and the second blue light emitting chip 1413) and the green light emitting chip 1412 can reduce the number of power supply wires 170, and facilitate simplifying the wiring structure of the lamp panel 100.

[0162] The backlight module 200 can further include a first connection wire to connect the second blue light emitting chip 1413, the green light emitting chip 1412, and the first power supply wire 171, a second connection wire to connect the first blue light emitting chip 131 and the first power supply wire 171, and a third connection wire to connect the red light emitting chip 1411 and the second power supply wire 172.

[0163] Alternatively, the power supply wires 170 can further include a third power supply wire connected to the green light emitting chip 1412, and can supply power to the green light emitting chip 1412. In this way, the blue light emitting chips (including the first blue light emitting chip 131 and the second blue light emitting chip 1413) and the green light emitting chip 1412 can be supplied with power respectively, and the mutual influence between the blue light emitting chips and the green light emitting chip 1412 can be reduced.

[0164] Continuing to refer to Figure 5 In some examples, the lamp panel 100 can further include a driving chip 180, the driving chip 180 and the light emitting unit 120 are arranged on the same side of the circuit board 110, the driving chip 180 is connected to the light emitting unit 120, and the driving chip 180 is used to drive the light emitting unit 120 to emit light.

[0165] The driving chip 180 can be packaged in a CSP manner, so as to reduce the occupied space of the driving chip 180 on the circuit board 110, and thus the size of the circuit board 110 can be reduced.

[0166] It can be understood that the driving chip 180 is arranged on the circuit board 110, which can improve the connection convenience between the driving chip 180 and the light emitting unit 120.

[0167] As shown in Figure 5 , in the same red-green-blue light emitting unit 140, at least two red light emitting chips 1411 can be connected in series and connected with the second power supply wire 172 and the driving chip 180, at least two green light emitting chips 1412 can be connected in series and connected with the first power supply wire 171 and the driving chip 180, and at least two second blue light emitting chips 1413 can be connected in series and connected with the first power supply wire 171 and the driving chip 180.

[0168] Continuing to refer to Figure 5 , for example, in two light emitting units 120 arranged adjacent along the length direction X of the circuit board 110, the plurality of red light emitting chips 1411 in the two red-green-blue light emitting units 140 can be connected in series and connected with the second power supply wire 172 and the driving chip 180, the plurality of green light emitting chips 1412 in the two red-green-blue light emitting units 140 can be connected in series and connected with the first power supply wire 171 and the driving chip 180, and the plurality of second blue light emitting chips 1413 in the two red-green-blue light emitting units 140 can be connected in series and connected with the first power supply wire 171 and the driving chip 180.

[0169] And in the two light emitting units 120 arranged adjacent along the length direction X of the circuit board 110, the two first blue light emitting chips 131 in the two white light emitting units 130 can be connected in series and connected with the first power supply wire 171 and the driving chip 180.

[0170] With the above arrangement, the wire structure on the circuit board 110 can be reduced, which is beneficial to the miniaturization of the circuit board 110.

[0171] Alternatively, the first blue light emitting chip 131, the second blue light emitting chip 1413, the red light emitting chip 1411 and the green light emitting chip 1412 can also be connected with the power supply wire 170 and the driving chip 180 respectively, and the embodiments of the present application do not make further limitation.

[0172] In some examples, as shown in Figure 5 , along the width direction Y of the circuit board 110 (i.e. the width direction of the circuit board 110), the power supply wire 170 and the driving chip 180 are arranged on both sides of the light emitting unit 120 respectively.

[0173] In this way, the light-emitting unit 120 can be located in the middle region of the circuit board 110 along the width direction Y of the circuit board 110, improving the light-emitting effect of the lamp panel 100, thereby improving the display effect of the display device 400. In addition, the connection convenience of the first blue light-emitting chip 131, the red light-emitting chip 1411, the green light-emitting chip 1412, and the second blue light-emitting chip 1413 to the power supply trace 170 and the driving chip 180 can also be improved.

[0174] In some examples, the driving chip 180 can detect its own temperature. When the temperature is greater than a set temperature threshold, the driving chip 180 can reduce the current flowing through at least one of the first blue light-emitting chip 131, the second blue light-emitting chip 1413, the red light-emitting chip 1411, and the green light-emitting chip 1412 to reduce the risk of the temperature of the light-emitting unit 120 being too high, causing damage to other components (e.g., the light guide 220).

[0175] Referring again to Figure 2 In some examples, the backlight module 200 further includes a heat sink 230, and the heat sink 230 includes a bottom plate 231 and a side plate 232.

[0176] Taking the backlight module 200 as a side-light backlight module as an example, as shown in Figure 2 The bottom plate 231 is arranged on the backlight side of the light guide 220, that is, the bottom plate 231 is arranged on the side of the light guide 220 away from the liquid crystal panel 320. The side plate 232 is arranged on the side of the lamp panel 100 away from the light guide 220.

[0177] For example, the heat sink 230 can be made of metal to dissipate heat. The bottom plate 231 can be connected to the side plate 232. For example, the bottom plate 231 and the side plate 232 can be an integrally formed structure to improve the connection reliability of the two.

[0178] Referring to Figure 5 In some examples, the circuit board 110 includes a circuit board body 111 and a protruding portion 112, and along the width direction Y of the circuit board 110 (i.e., the width direction of the circuit board 110), the protruding portion 112 is arranged on one side of the circuit board body 111 and connected to the circuit board body 111.

[0179] For example, the protruding portion 112 and the circuit board body 111 can be an integrally formed structure to improve the connection reliability of the two.

[0180] Continuing to refer to Figure 5 The lamp panel 100 further includes a wiring terminal 190, the wiring terminal 190 and the light-emitting unit 120 are arranged on the same side of the circuit board 110, and the wiring terminal 190 is arranged on the protruding portion 112, and the wiring terminal 190 is connected to the power supply trace 170.

[0181] It can be understood that the wiring terminal 190 can include a plurality of pins for connecting with an external power supply device, so that the external power supply device can supply power to the power supply wire 170 through the wiring terminal 190, so that the light emitting unit 120 can emit light.

[0182] In some examples, a surface of the bottom plate 231 on a side facing the light guide member 220 is provided with a relief groove (not shown in the figure), and at least a part of the wiring terminal 190 is embedded in the relief groove along the width direction Y of the circuit board 110 (i.e., the width direction of the circuit board 110).

[0183] It can be understood that at least a part of the wiring terminal 190 is embedded in the relief groove, so that the wiring terminal 190 and the bottom plate 231 can share space in the width direction Y of the circuit board 110, thereby reducing the width of the backlight module 200 along the width direction Y of the circuit board 110, and facilitating the thinning of the display device 400.

[0184] Again referring to Figure 2 , the display panel 300 can further include a back plate 310, the back plate 310 including a first sub-plate 311 and a second sub-plate 312, the first sub-plate 311 can be arranged on a side of the bottom plate 231 away from the light guide member 220, and the second sub-plate 312 can be arranged on a side of the side plate 232 away from the lamp plate 100.

[0185] The first sub-plate 311 and the second sub-plate 312 are connected, and for example, the first sub-plate 311 and the second sub-plate 312 can be an integrally formed structure to improve the connection reliability between the first sub-plate 311 and the second sub-plate 312.

[0186] It can be understood that the back plate 310 can protect the backlight module 200. For example, the back plate 310 can be made of metal to improve the mechanical strength of the back plate 310. Alternatively, the back plate 310 can also be made of non-metal material, and the embodiments of the present application do not make further limitation on the material of the back plate 310.

[0187] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or as many as possible technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, characterized in that, The application relates to a light guide piece, a lamp plate arranged on the light entrance side of the light guide piece, and a circuit board. The lamp plate is used for emitting light to the light guide piece to provide backlight for a liquid crystal panel. The lamp plate comprises the circuit board, the circuit board being in a strip shape. A plurality of light emitting units are arranged on one side of the circuit board along the thickness direction of the circuit board. The white light emitting unit comprises a first blue light emitting chip and a photo-luminescent part arranged on the light exit side of the first blue light emitting chip. The photo-luminescent part is used for converting blue light into white light. The red-green-blue light emitting unit comprises a plurality of light emitting chips arranged on one side of the white light emitting unit along the length direction of the circuit board. The plurality of light emitting chips comprise a red light emitting chip, a green light emitting chip and a second blue light emitting chip. At least one red light emitting chip and one green light emitting chip are arranged between the second blue light emitting chip and the first blue light emitting chip.

2. The backlight module of claim 1, wherein, The long side of the at least one light emitting chip in the red-green-blue light emitting unit is parallel to the width direction of the circuit board, and the short side of the at least one light emitting chip is parallel to the length direction of the circuit board. The lamp plate further comprises a second dam arranged on the same side of the circuit board as the light emitting unit. The second dam is used for limiting the light exit direction of the light emitting unit. The second dam is arranged between the white light emitting unit and the red-green-blue light emitting unit along the length direction of the circuit board.

3. The backlight module of claim 2, wherein, The lamp plate further comprises a power supply wire arranged on the circuit board and connected with the light emitting unit. The power supply wire is used for supplying power for the light emitting unit. A driving chip is arranged on the same side of the circuit board as the light emitting unit. The driving chip is connected with the light emitting unit and used for driving the light emitting unit to emit light. The power supply wire and the driving chip are respectively arranged on two sides of the light emitting unit along the width direction of the circuit board. The lamp plate further comprises a heat dissipation plate. The heat dissipation plate comprises a bottom plate and a side plate. The bottom plate is arranged on the backlight side of the light guide piece. The side plate is arranged on the side of the lamp plate away from the light guide piece.

4. The backlight module of claim 1, wherein, The circuit board comprises a circuit board body and a protruding part. The protruding part is arranged on one side of the circuit board body along the width direction of the circuit board and connected with the circuit board body. The lamp plate further comprises a wiring terminal arranged on the same side of the circuit board as the light emitting unit. The wiring terminal is arranged on the protruding part and connected with the power supply wire. At least a part of the wiring terminal is embedded in the avoiding groove along the width direction of the circuit board. The number of the red light emitting chips is two, and the number of the green light emitting chips is two. Two green light emitting chips are arranged on two sides of the second blue light emitting chip along the length direction of the circuit board.

5. The backlight module of claim 4, wherein, The number of the second blue light emitting chips is two, and the two second blue light emitting chips are arranged adjacently along the length direction of the circuit board.

6. The backlight module of claim 5, wherein, Along the length direction of the circuit board, the distance between the center of the second blue light emitting chip close to the white light emitting unit and the center of the white light emitting unit in the two second blue light emitting chips is a first distance, and the distance between the centers of any two adjacently arranged light emitting chips in the red-green-blue light emitting unit is a second distance. The ratio of the first distance to the second distance is in the range of 4-8.

7. The backlight module of claim 6, wherein, Along the length direction of the circuit board, the distance between the center of the white light emitting unit and the center of the red light emitting chip arranged adjacently to the white light emitting unit is a third distance, and the third distance is greater than the second distance.

8. The backlight module of claim 1, wherein, Along the length direction of the circuit board, the ratio of the width of the white light emitting unit to the width of the red-green-blue light emitting unit is in the range of 0.3-1.

9. The backlight module of claim 1, wherein, The lamp panel further comprises: A first dam is arranged on the same side of the circuit board as the light emitting unit, and the first dam extends along the length direction of the circuit board, and the first dam is used to limit the light emitting direction of the light emitting unit. The number of the first dams is two, and the two first dams are arranged on the two sides of the plurality of light emitting units along the width direction of the circuit board.

10. The backlight module of claim 9, wherein, The lamp panel further comprises: A protection part covers the light emitting unit, and the protection part is a transparent structure, and in the direction perpendicular to the circuit board, the first dam protrudes from the protection part.

11. The backlight module according to claim 9 or 10, characterized in that, In the direction perpendicular to the circuit board, the first dam protrudes from the light emitting unit and the second dam.

12. The backlight module of any one of claims 1-10, wherein, The wavelength of the blue light emitted by the first blue light emitting chip is different from the wavelength of the blue light emitted by the second blue light emitting chip.

13. A display device, characterized by comprising: The backlight module comprises: The backlight module according to any one of claims 1-12; A liquid crystal panel is arranged in the light emitting direction of the light guide of the backlight module. The backlight module comprises:

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