Backlight module, display screen and electronic equipment

Abstract

The utility model relates to the technical field of image display, and provides a backlight module, a display screen and electronic equipment, the backlight module comprises a light guide plate, a white light source and a plurality of infrared light sources. The light guide plate is provided with a light-in surface and a light-out surface and is arranged on the back surface of the liquid crystal panel, and the light-out surface faces the back surface of the liquid crystal panel. The white light source is arranged on the light incident surface. And the plurality of infrared light sources are respectively arranged on the light incident surface, and the plurality of infrared light sources are configured to respectively emit infrared light of one or more wavebands to the light incident surface. According to the backlight module provided by the utility model, the plurality of infrared light sources are arranged on the light incident surface of the light guide plate, so that the infrared light emitted by the plurality of infrared light sources does not affect a displayed image when passing through the liquid crystal panel; and after being absorbed by the eyes of the user, the eye protection composition can jointly promote the metabolic activity of eye cells and eye blood circulation and stimulate the eyes to generate beneficial substances, so that the eye fatigue can be better relieved, and the eye protection treatment effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to image display technical field especially relates to a backlight unit, display screen and electronic equipment. BACKGROUND

[0002] Long time watches electronic screen to cause damage to user's eyesight, the main design train of thought of existing eye protection screen is mainly through changing screen light, brightness, refresh rate etc. INVENTION CONTENTS

[0003] The utility model provides a backlight unit, display screen and electronic equipment to solve the problem of poor eye protection effect of the prior art eye protection screen.

[0004] In a first aspect, the utility model provides a backlight unit, comprising:

[0005] The light guide plate has a light entrance surface and a light exit surface, and is configured to be arranged on the back surface of the liquid crystal panel.

[0006] The white light source is arranged on the light entrance surface.

[0007] A plurality of infrared light sources are arranged on the light entrance surface, and the plurality of infrared light sources are configured to emit one or more wavebands of red light and / or infrared light towards the light entrance surface.

[0008] According to the backlight unit of the utility model, the light exit surface is formed on the end surface of the light guide plate and is configured to be arranged parallel to the back surface of the liquid crystal panel.

[0009] The light entrance surface is formed on the side surface of the light guide plate and is configured to be arranged along the length direction and / or width direction of the liquid crystal panel.

[0010] According to the backlight unit of the utility model, the light entrance surface includes a first light entrance surface and a second light entrance surface located on opposite sides of the light guide plate, the white light source is arranged on the first light entrance surface, and the infrared light source is arranged on the second light entrance surface.

[0011] According to the backlight unit of the utility model, the white light source has a plurality of infrared light sources and a plurality of white light sources arranged on the same side surface of the light guide plate and arranged alternately along the length direction or width direction of the liquid crystal panel.

[0012] The backlight module has the advantages that the multiple infrared light sources are arranged along the length direction or the width direction of the liquid crystal panel, and the white light source and the infrared light sources are arranged side by side along the thickness direction of the liquid crystal panel.

[0013] The backlight module has the advantages that the multiple infrared light sources are arranged along the length direction or the width direction of the liquid crystal panel, and the white light source and the infrared light sources are arranged side by side along the thickness direction of the liquid crystal panel.

[0014] The infrared light source comprises one or more of a first light source, a second light source, a third light source and a fourth light source.

[0015] The first light source is configured to emit red light with a wavelength of 650nm; the second light source is configured to emit red light with a wavelength of not less than 606nm and not more than 635nm; the third light source is configured to emit red light or infrared light with a wavelength of not less than 710nm and not more than 780nm; and the fourth light source is configured to emit infrared light with a wavelength of not less than 950nm and not more than 1600nm.

[0016] The backlight module further comprises multiple infrared waveband drivers, and the multiple infrared waveband drivers are connected to the multiple infrared light sources in one-to-one correspondence.

[0017] In the second aspect, the utility model also provides a display screen, include: liquid crystal panel and above any one of the backlight module, the light guide plate is located the back of liquid crystal panel, the infrared light source and white light source surround liquid crystal panel and set.

[0018] In the third aspect, the utility model also provides an electronic device comprising the display screen.

[0019] The backlight module has the advantages that the multiple infrared light sources are arranged along the length direction or the width direction of the liquid crystal panel, and the white light source and the infrared light sources are arranged side by side along the thickness direction of the liquid crystal panel. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 is a schematic diagram of the backlight module and the liquid crystal panel provided by the embodiment of the present application.

[0022] Figure 2 is a schematic diagram of the backlight module provided by another embodiment of the present application.

[0023] Figure 3 is a schematic diagram of the backlight module provided by still another embodiment of the present application.

[0024] Figure 4 is a schematic diagram of the backlight module provided by still another embodiment of the present application.

[0025] Figure 5 is a connection schematic diagram of the power supply, the infrared waveband driver and the infrared light source provided by still another embodiment of the present application.

[0026] Reference signs:

[0027] 1, backlight module; 2, liquid crystal panel;

[0028] 11, light guide plate; 111, light entrance surface; 1111, first light entrance surface; 1112, second light entrance surface; 112, light exit surface;

[0029] 12, white light source;

[0030] 13, infrared light source; 131, first light source; 132, second light source; 133, third light source; 134, fourth light source;

[0031] 14, infrared waveband driver. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] The backlight module of the present application will be described below in combination with Figures 1-5 the drawings.

[0034] As Figures 1 to 5 shown, the utility model provides a backlight module 1, include: light guide plate 11, white light source 12 and a plurality of infrared light source 13. Light guide plate 11 has the light entrance surface 111 and the light exit surface 112, light guide plate 11 is configured to set up at the back of liquid crystal panel 2, the light exit surface 112 is set up towards the back of liquid crystal panel 2. White light source 12 is located at the light entrance surface 111. A plurality of infrared light source 13, respectively, are located at the light entrance surface 111, a plurality of infrared light source 13 are configured to respectively emit one or more wave bands of red light or infrared light to the light entrance surface 111;The wavelength of the red light or infrared light emitted by each infrared light source 13 is not less than 606nm, and is not more than 1600nm.

[0035] The backlight module 1 of the embodiment can be installed in a display device having a liquid crystal panel 2, and emit light to the liquid crystal panel 2 to display images in cooperation with the liquid crystal panel 2. Specifically, the light guide plate 11 has a light entrance surface 111 and a light exit surface 112, the light entrance surface 111 is provided with a white light source 12 and an infrared light source 13, by reasonably setting the size structure, refractive index, position of the light entrance surface 111 and the light exit surface 112, the incident angle of the light of the white light source 12 and the infrared light source 13 on the light entrance surface 111, the light incident on the light entrance surface 111 can be guided to the light exit surface 112 by refraction, reflection and other ways, and emitted from the light exit surface 112. The light guide plate 11 is located at the back of the liquid crystal panel 2, and the light exit surface 112 faces the liquid crystal panel 2, so that the light emitted from the light exit surface 112 can be emitted outward through the liquid crystal panel 2. Among them, the white light emitted by the white light source 12 can be adjusted by the liquid crystal elements and electronic elements on the liquid crystal panel 2 under the control of the controller when passing through the liquid crystal panel 2, the brightness and color of the light emitted from the side of the liquid crystal panel 2 away from the light guide plate 11 are changed to form a color image; in addition, the plurality of infrared light sources 13 can emit red light or infrared light with a wavelength range of 606-1600nm to the light entrance surface 111, the infrared light is invisible light, which will not affect the image displayed by the liquid crystal panel 2 after being emitted through the liquid crystal panel 2, and can play an eye protection function.

[0036] It can be understood that within the wavelength range of 606-1600nm, different wave bands of red light or infrared light can have different eye protection effects. The plurality of infrared light sources 13 of the embodiment can emit red light or infrared light of the same wave band to the light entrance surface 11 to achieve a specific eye protection effect; or the plurality of infrared light sources 13 can be configured to emit infrared light of different wave bands, and the different wave bands of red light or infrared light can cooperate with each other after entering the user's eyes to promote the metabolic activity of the eye cells, the blood circulation of the eyes and stimulate the eyes to produce beneficial substances, which can better relieve eye fatigue and have a certain therapeutic effect on the eyes, and the eye protection effect is better.

[0037] The backlight module 1 of the utility model, through setting white light source 12 and multiple infrared light sources 13 simultaneously on the light entrance face 111 of light guide plate 11, light guide plate 11 can guide the light emitted by two kinds of light sources to light exit face 112 through refraction, reflection and other ways, and emit from light exit face 112 to liquid crystal panel 2, the white light emitted by white light source 12 can form color image after modulating through liquid crystal panel 2, the infrared light emitted by multiple infrared light sources 13 will not affect the displayed image when passing through liquid crystal panel 2, and can promote the metabolic activity of eye cells, eye blood circulation and stimulate the eyes to produce beneficial substances after being absorbed by the user's eyes, which can better relieve eye fatigue and have a certain therapeutic effect on the eyes, and is beneficial to improve and enhance the eye protection effect of backlight module 1.

[0038] Specifically, in some embodiments, as shown in Figures 1 to 4 The light exit face 112 is formed on the end face of the light guide plate 11 and is configured to be arranged in parallel with the back face of the liquid crystal panel 2. The light entrance face 111 is formed on the side face of the light guide plate 11 and is configured to be arranged along the length direction of the liquid crystal panel 2.

[0039] In the present embodiment, by setting the light exit face 112 on the end face parallel to the liquid crystal panel 2 and setting the light entrance face 111 on the side face of the light guide plate 11, the white light source 12 and the infrared light source 13 are correspondingly arranged on the corresponding side of the light guide plate 11, so that the white light source 12 and the infrared light source 13 are directed towards the light entrance face 111. By reasonably designing the incident angle of the light emitted by the white light source 12 and the infrared light source 13 on the light entrance face 111, the thickness and the refractive index of the light guide plate 11, the white light source 12 and the infrared light source 13 can be guided to the light exit face 112 through refraction and reflection of the optical fiber.

[0040] Optionally, in some embodiments, the light entrance face 111 can also be configured to be arranged along the width direction of the liquid crystal panel 2.

[0041] Optionally, in some embodiments, the light entrance face 111 can also have multiple light entrance faces, wherein a part of the light entrance faces 111 are configured to be arranged along the length direction of the liquid crystal panel 2, and another part of the light entrance faces 111 are configured to be arranged along the width direction of the liquid crystal panel 2.

[0042] It can be understood that in the display screen, the liquid crystal panel 2 and the light guide plate 11 are stacked along the thickness direction of the display screen. By setting the light entrance face 111 on the side face of the light guide plate 11 and arranging the light entrance face 111 along the length direction or the width direction of the liquid crystal panel 2, the white light source 12 and the infrared light source 13 are located on the side face of the light guide plate 11, which is beneficial to reduce the overall thickness of the backlight module 1, and further beneficial to reduce the overall thickness of the display screen.

[0043] It can be understood that, as Figure 1 and Figure 2 shown, the liquid crystal panel 2 can be a rectangular panel, the length direction of the liquid crystal panel 2 is arranged along the long side of the display surface or the back surface of the liquid crystal panel 2, the width direction of the liquid crystal panel 2 is arranged along the short side of the display surface or the back surface of the liquid crystal panel 2, and the thickness direction of the liquid crystal panel 2 is perpendicular to the display surface or the back surface of the liquid crystal panel 2.

[0044] It can be understood that the light-in surface 111 can be arranged on one or more sides of the light guide plate 11 according to actual needs.

[0045] Optionally, in some embodiments, as Figure 1 shown, the light-in surface 111 includes a first light-in surface 1111 and a second light-in surface 1112 respectively arranged on opposite sides of the light guide plate 11, the white light source 12 is arranged on the first light-in surface 1111, and the infrared light source 13 is arranged on the second light-in surface 1112.

[0046] In the present embodiment, by arranging the first light-in surface 1111 and the second light-in surface 1112 on opposite sides of the light guide plate 11 respectively, the first light-in surface 1111 is used to arrange the white light source 12, and the second light-in surface 1112 is used to arrange the infrared light source 13, so that the white light source 12 and the infrared light source 13 do not interfere with each other or occupy each other's arrangement space, so as to install a sufficient number or a sufficient light-emitting area of the white light source 12 and the infrared light source 13 on the first light-in surface 1111 and the second light-in surface 1112 respectively without increasing the overall thickness of the backlight module 1, ensuring the intensity of white light and infrared light while making the light as evenly distributed as possible to provide better display effect and eye protection effect.

[0047] The first light-in surface 1111 and the second light-in surface 1112 can be arranged on opposite sides of the light guide plate 11 along the length direction of the liquid crystal panel 2, in which case the first light-in surface 1111 and the second light-in surface 1112 are both arranged along the width direction of the liquid crystal panel 2. Alternatively, the first light-in surface 1111 and the second light-in surface 1112 can also be arranged on opposite sides of the light guide plate 11 along the width direction of the liquid crystal panel 2, in which case the first light-in surface 1111 and the second light-in surface 1112 are both arranged along the length direction of the liquid crystal panel 2.

[0048] Optionally, in other embodiments, as Figure 2 shown, the white light source 12 has a plurality of white light sources 12, and the plurality of infrared light sources 13 and the plurality of white light sources 12 are arranged on the same side of the light guide plate 11 and are arranged alternately along the length direction or the width direction of the liquid crystal panel 2.

[0049] In the embodiment, by arranging the plurality of infrared light sources 13 and the plurality of white light sources 12 on the same side of the light guide plate 11, the size of the backlight module 1 along the width direction of the liquid crystal panel 2 is reduced, and the size of the display screen along the width direction of the liquid crystal panel 2 is reduced. Meanwhile, by arranging the plurality of infrared light sources 13 and the plurality of white light sources 12 along the length direction or the width direction of the liquid crystal panel 2 alternately, the infrared light sources 13 and the white light sources 12 can be uniformly distributed on the light-incident surface 111, so that the white light and the infrared light can be emitted from the light-emitting surface 112 as evenly as possible, thereby providing better display effect and eye protection effect.

[0050] Alternatively, the plurality of infrared light sources 13 and the plurality of white light sources 12 can be arranged on the side of the light guide plate 11 corresponding to the long side of the display surface or the back surface of the liquid crystal panel 2, and arranged alternately along the length direction of the liquid crystal panel 2.

[0051] Alternatively, the plurality of infrared light sources 13 and the plurality of white light sources 12 can be arranged on the side of the light guide plate 11 corresponding to the short side of the display surface or the back surface of the liquid crystal panel 2, and arranged alternately along the width direction of the liquid crystal panel 2.

[0052] Alternatively, part of the infrared light sources 13 and part of the white light sources 12 can be arranged on the side of the light guide plate 11 corresponding to the short side of the display surface or the back surface of the liquid crystal panel 2, and the other part of the infrared light sources 13 and the other part of the white light sources 12 can be arranged on the side of the light guide plate 11 corresponding to the long side of the display surface or the back surface of the liquid crystal panel 2.

[0053] Alternatively, in some other embodiments, as shown in Figure 3 and Figure 4 , the plurality of infrared light sources 13 are arranged along the length direction or the width direction of the liquid crystal panel 2, and the white light sources 12 are arranged side by side with the infrared light sources 13 along the thickness direction of the liquid crystal panel 2.

[0054] In the embodiment, by arranging the white light sources 12 side by side with the infrared light sources 13 along the thickness direction of the liquid crystal panel 2, the white light sources 12 and the infrared light sources 13 are arranged on the same side of the light guide plate 11, which is beneficial to reduce the size of the backlight module 1 along the width direction of the liquid crystal panel 2. Meanwhile, the plurality of infrared light sources 13 can be arranged along the length direction or the width direction of the liquid crystal panel 2 according to the extension direction of the light-incident surface 111, so that the infrared light sources 13 can be uniformly distributed, which is beneficial to uniformly distribute the infrared light rays passing through the liquid crystal panel 2, thereby providing better eye protection effect.

[0055] In some embodiments, as shown in Figure 4 , the white light sources 12 are also provided in plurality and arranged side by side with the infrared light sources 13 one by one, so that the white light can also be uniformly distributed, thereby providing better display effect.

[0056] Specifically, in some embodiments, as shown in Figure 2 and Figure 4 Any two adjacent infrared light sources 13 are configured to emit infrared light of different wavebands to the light entrance surface 111, respectively.

[0057] In the present embodiment, by setting the wavelengths of the infrared light emitted by any two adjacent infrared light sources 13 to be different, the infrared light of the same wavelength can be as evenly dispersed as possible into the light entrance surface 111 and evenly dispersed from the light exit surface 112, and the user's eye can also simultaneously receive infrared light of multiple wavelengths, so that the infrared light of multiple wavelengths acts on the user's eye together to achieve a better eye protection treatment effect.

[0058] Specifically, in some embodiments, as shown in Figure 2 and Figure 4 The infrared light source 13 includes one or more of a first light source 131, a second light source 132, a third light source 133, and a fourth light source 134. The first light source 131 is configured to emit red light with a wavelength of 650 nm. The second light source 132 is configured to emit red light with a wavelength not less than 606 nm and not greater than 635 nm. The third light source 133 is configured to emit red light or infrared light with a wavelength not less than 710 nm and not greater than 780 nm. The fourth light source 134 is configured to emit infrared light with a wavelength not less than 950 nm and not greater than 1600 nm.

[0059] The first light source 131 in the present embodiment can emit infrared light with a wavelength of 650 nm, which can promote the metabolic activity of retinal cells. The second light source 132 can emit red light with a wavelength not less than 606 nm and not greater than 635 nm, which can make up for the melatonin suppression effect caused by blue light and promote the secretion of melatonin in the eye. The third light source 133 can emit red light or infrared light with a wavelength not less than 710 nm and not greater than 780 nm, which can penetrate into the eye tissue and promote the production of beneficial substances such as nitric oxide in the eye. The fourth light source 134 can emit infrared light with a wavelength not less than 950 nm and not greater than 1600 nm, which can stimulate mitochondria to produce energy and promote blood circulation. The infrared light source 13 in the present embodiment can be selected from one or more of the above light sources. A single waveband infrared light source 13 can provide a specific eye protection treatment effect, and multiple waveband infrared light sources 13 can cooperate with each other to achieve a more comprehensive eye protection treatment effect.

[0060] Based on the first light source 131, the second light source 132, the third light source 133, and the fourth light source 134, and the foregoing embodiments, the present application provides three specific embodiments.

[0061] In a first specific embodiment, as shown in Figure 1 the first light entrance surface 1111 and the second light entrance surface 1112 can be respectively arranged on opposite sides of the light guide plate 11 along the length direction of the liquid crystal panel 2, the first light entrance surface 1111 and the second light entrance surface 1112 are both arranged along the width direction of the liquid crystal panel 2, the white light source 12 and the infrared light source 13 are both multiple, the multiple white light sources 12 are arranged on the first light entrance surface 1111 along the width direction of the liquid crystal panel 2, the multiple infrared light sources 13 are arranged on the second light entrance surface 1112 along the width direction of the liquid crystal panel 2, and the multiple infrared light sources 13 are all one of the first light source 131, the second light source 132, the third light source 133 and the fourth light source 134.

[0062] In a second specific embodiment, as shown in Figure 2 the first light source 131, the second light source 132, the third light source 133 and the fourth light source 134, the multiple infrared light sources 13 and the multiple white light sources 12 are respectively arranged on the same side of the light guide plate 11 and are alternately arranged along the length direction or the width direction of the liquid crystal panel 2. Among them, the multiple infrared light sources 13 include one or more light source groups arranged along the length direction or the width direction of the liquid crystal panel 2, and each light source group includes the first light source 131, the second light source 132, the third light source 133 and the fourth light source 134 arranged along the arrangement direction of the light source group.

[0063] In a third specific embodiment, as shown in Figure 3 and Figure 4 the multiple infrared light sources 13 are arranged along the length direction or the width direction of the liquid crystal panel 2, and the white light source 12 and the infrared light source 13 are arranged side by side one by one along the thickness direction of the liquid crystal panel 2. Among them, the multiple infrared light sources 13 include one or more light source groups arranged along the length direction or the width direction of the liquid crystal panel 2, and each light source group includes the first light source 131, the second light source 132, the third light source 133 and the fourth light source 134 arranged along the arrangement direction of the light source group.

[0064] Specifically, as shown in Figure 3 the infrared light source 13 and the white light source 12 are both connected with the connecting piece, the connecting piece extends to the end surface of the light guide plate 11, and the connecting piece and the light guide plate 11 are bonded by lamp guide glue.

[0065] In some embodiments, as shown in Figure 5 the backlight module 1 further includes: multiple infrared waveband drivers 14, and the multiple infrared waveband drivers 14 are respectively connected with the multiple infrared light sources 13 one by one.

[0066] In the embodiment, the plurality of infrared band drivers 14 are connected with the plurality of infrared light sources 13 one by one, so as to independently control the infrared light bands emitted by the infrared light sources 13, and the infrared light bands emitted by the infrared light sources 13 can meet the design requirements of eye protection. It can be understood that the plurality of infrared band drivers 14 can be connected with a power supply (such as a battery) to supply power to the plurality of infrared band drivers 14 and the plurality of infrared light sources 13.

[0067] In a second aspect, as shown in the accompanying drawings, the utility model provides a display screen, including: liquid crystal panel 2 and the backlight module 1 provided by any one of the above embodiments, light guide plate 11 is located at the back of liquid crystal panel 2, infrared light source 13 and white light source 12 are arranged around liquid crystal panel 2. Figure 1

[0068] The display screen of the utility model, through adopting the backlight module 1 in the above embodiment, also has the advantages of the above backlight module 1, which will not be repeated here. At the same time, by arranging the infrared light source 13 and the white light source 12 around the liquid crystal panel 2, i.e. arranging the infrared light source 13 and the white light source 12 along the side edge of the liquid crystal panel 2, the infrared light source 13 and the white light source 12 can be dispersedly distributed along the side edge of the liquid crystal panel 2, which is conducive to making the infrared light and the white light more uniformly pass through the liquid crystal panel 2 and then be emitted, so as to provide better display effect and eye protection effect.

[0069] Further, the display screen can also be provided with a reflecting plate, the reflecting plate is oppositely arranged with the light inlet surface 111, and the infrared light source 13 and the white light source 12 are located between the reflecting plate and the light inlet surface 111, so as to guide the light not directly emitted to the light inlet surface 111 to the light inlet surface 111 through reflection, thereby reducing energy waste.

[0070] In a third aspect, the utility model also provides an electronic device comprising the display screen of the above embodiment. The electronic device of the utility model, by adopting the display screen in the above embodiment, also has the advantages of the above display screen and backlight module 1, which will not be repeated here. The electronic device of the utility model can be a learning machine, a translation machine, a mobile phone, a notebook computer, a desktop computer, a television and other electronic devices with display function, which are not limited by the utility model.

[0071] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.​

Claims

1. A backlight module, characterized in that, The application relates to a backlight module and a display screen. The backlight module comprises a light guide plate, a white light source and a plurality of infrared light sources. The light guide plate has an incident light surface and an emergent light surface, and is arranged on the back surface of a liquid crystal panel. The emergent light surface is arranged on the back surface of the liquid crystal panel. The white light source is arranged on the incident light surface.

2. The backlight module of claim 1, wherein, The plurality of infrared light sources are arranged on the incident light surface. Each of the infrared light sources emits red light or infrared light with a wavelength not less than 606 nm and not more than 1600 nm.

3. The backlight module of claim 2, wherein, The infrared light source comprises one or more of a first light source, a third light source and a fourth light source.

4. The backlight module of claim 2, wherein, The first light source emits red light with a wavelength of 650 nm.

5. The backlight module of claim 2, wherein, The third light source emits red light or infrared light with a wavelength not less than 710 nm and not more than 780 nm.

6. The backlight module according to claim 4 or 5, characterized in that, The fourth light source emits infrared light with a wavelength not less than 950 nm and not more than 1600 nm.

7. The backlight module according to any one of claims 1 to 5, wherein, The emergent light surface is formed on the end surface of the light guide plate and is arranged in parallel with the back surface of the liquid crystal panel. The incident light surface is formed on the side surface of the light guide plate and is arranged along the length direction and / or the width direction of the liquid crystal panel.

8. A display screen, characterized by The incident light surface comprises a first incident light surface and a second incident light surface arranged on opposite sides of the light guide plate. The white light source is arranged on the first incident light surface, and the infrared light source is arranged on the second incident light surface.

9. An electronic device, comprising: The plurality of infrared light sources and the plurality of white light sources are arranged on the same side surface of the light guide plate and are arranged alternately along the length direction or the width direction of the liquid crystal panel. The plurality of infrared light sources are arranged along the length direction or the width direction of the liquid crystal panel. The white light source and the infrared light source are arranged side by side along the thickness direction of the liquid crystal panel. Any two adjacent infrared light sources are arranged to emit red light or infrared light with different wave bands to the incident light surface. The application further relates to a plurality of infrared wave band drivers. The plurality of infrared wave band drivers are connected to the plurality of infrared light sources one by one. The application relates to a display screen. The display screen comprises a liquid crystal panel and the backlight module. The backlight module is arranged on the back surface of the liquid crystal panel. The infrared light source and the white light source are arranged around the liquid crystal panel.

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