CN116909056A

CN116909056A - Backlight module, display module and vehicle

Info

Publication number: CN116909056A
Application number: CN202310868266.7A
Authority: CN
Inventors: 李炫运
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; Yecheng Optoelectronics Wuxi Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2023-10-20
Also published as: TW202503389A; TWI857724B

Abstract

The application provides a backlight module, comprising: the first light-emitting part is used for emitting a first backlight; the second light-emitting part comprises a light-emitting panel and a light modulation plate, wherein the light-emitting panel is used for emitting second backlight to the direction of the first light-emitting part, and the light modulation plate is used for reducing the diffusion angle of the second backlight in the first direction; the control module is used for controlling the light-emitting states of the first light-emitting part and the second light-emitting part so as to enable the backlight module to be switched between a first state and a second state; wherein in the first state, the first light emitting part emits the first backlight, and the second light emitting part does not emit light; in the second state, the first light emitting portion does not emit light, the second light emitting portion emits the second backlight, and the second backlight passes through the first light emitting portion. The application also provides a display module applying the backlight module and a vehicle.

Description

Backlight module, display module and vehicle

Technical Field

The application relates to the technical field of display, in particular to a backlight module, a display module applying the backlight module and a vehicle applying the display module.

Background

With the development of display technology, the display module is widely used in various scenes, so that a display device with a peep-proof function is required in some special occasions, for example, in the driving process of a vehicle, the peep-proof function is set for the display module at the co-driver position in order to prevent the driver from being distracted. The prior peep-proof display device is mainly characterized in that a birefringence control type liquid crystal box is added on the basis of an original display module, and the visual angle is changed by controlling the liquid crystal direction. The disadvantage of the prior art is the high cost of the finished product.

Disclosure of Invention

The first aspect of the present application provides a backlight module, comprising:

the first light-emitting part comprises a transparent substrate and a first light-emitting diode matrix arranged on one side of the transparent substrate, wherein the first light-emitting diode matrix is used for emitting a first backlight;

the second light emitting part comprises a light emitting panel and a light modulation plate, the second light emitting part is arranged on one side, far away from the first backlight emitting direction, of the first light emitting part, the light modulation plate is arranged between the first light emitting part and the light emitting panel, the light emitting panel is used for emitting second backlight to the direction of the first light emitting part, and the light modulation plate is used for reducing the diffusion angle of the second backlight in the first direction; and

the control module is electrically connected with the first light-emitting part and the second light-emitting part and is used for controlling the light-emitting states of the first light-emitting part and the second light-emitting part so as to enable the backlight module to be switched between a first state and a second state;

wherein in the first state, the first light emitting part emits the first backlight, and the second light emitting part does not emit light; in the second state, the first light emitting portion does not emit light, the second light emitting portion emits the second backlight, and the second backlight passes through the first light emitting portion.

According to the backlight module provided by the embodiment of the application, the first light-emitting part and the second light-emitting part are arranged, so that the backlight module can be switched between the first state and the second state at will: in the first state, the first light emitting part emits first backlight, the second light emitting part does not emit light, and the backlight module is in a sharing mode, namely, the first backlight has a uniform and large diffusion angle, and can be received from any direction on the light emitting surface of the backlight module; in the second state, the first light emitting part does not emit light, the second light emitting part emits the second backlight, and the light modulation panel is used for reducing the diffusion angle of the second backlight in the first direction, so that the second backlight can be received in a specific range in the first direction, namely, the backlight module is in the privacy mode. According to the backlight module provided by the application, the light modulation plate and the transparent substrate light-emitting source are arranged, so that the diffusion angle of backlight is not required to be controlled by adding one liquid crystal module, the cost is low, the operation is convenient, and different states can be randomly switched, so that the peep-proof function of a switchable mode can be realized.

In an embodiment, the light modulation board includes an outer substrate disposed on two sides of the light modulation board and a membrane disposed between the outer substrates, and a plurality of light shielding sheets arranged in parallel along the first direction are disposed on the membrane.

In an embodiment, a diffusion angle between the second backlight emitted from the light modulation panel and the first direction is 60 ° -120 °.

According to the backlight module provided by the embodiment of the application, the diaphragm is arranged on the light modulation plate, so that the second backlight part can normally emit light with the diffusion angle of 60-120 degrees between the second backlight and the first direction through the light modulation plate, and the light modulation plate is used for reducing the diffusion angle of the second backlight in the first direction, so that the brightness of the second backlight outside the effective range of the emission angle of the light modulation plate is effectively reduced.

In an embodiment, the first light emitting portion includes a first diffusion plate, and the first diffusion plate is disposed on a side of the transparent substrate away from the second light emitting portion, and is configured to receive and diffuse the first backlight or the second backlight.

In an embodiment, the first light emitting portion further includes a brightness enhancement sheet disposed on a side of the first diffusion plate away from the second light emitting portion, and the brightness enhancement sheet is configured to receive and amplify the first backlight or the second backlight.

In an embodiment, the brightness enhancement sheet includes a polymer base layer and a plurality of triangular prisms disposed in parallel along a first direction on the polymer base layer, and the brightness enhancement sheet is used to modulate the first backlight or the second backlight such that brightness of the first backlight and the second backlight in an axial direction of the triangular prisms is enhanced.

In an embodiment, the first light emitting diode matrix includes a plurality of light emitting diodes, the first light emitting diode matrix includes a plurality of first dimming blocks, each of the first dimming blocks includes at least one of the light emitting diodes, and a luminance of each of the first dimming blocks is individually modulated. According to the backlight module provided by the embodiment of the application, the first diffusion plate is arranged on the first light-emitting part, and light passing through the first diffusion plate is atomized by refraction and reflection, so that a uniform surface light source is provided for the emergent light of the backlight module, and the backlight module has a better display effect. Through setting up luminance enhancement piece at first luminous portion, the reinforcing passes through the luminance of first luminous portion to promote backlight unit's display effect, and then be favorable to improving user's use experience. The first dimming blocks are arranged on the first light emitting diode matrix, and the brightness of each first dimming block can be independently modulated, so that the power consumption can be greatly reduced, and the contrast of a display picture can be improved.

In an embodiment, the light emitting panel includes a substrate and a second light emitting diode matrix disposed on the substrate, the second light emitting diode matrix including a plurality of light emitting diodes, the second light emitting diode matrix being configured to emit the second backlight.

In an embodiment, the second light emitting diode matrix includes a plurality of second dimming blocks, each of the second dimming blocks includes at least one light emitting diode, and the brightness of each of the second dimming blocks is individually modulated. In an embodiment, the light-emitting panel includes a reflective layer, a light guiding layer, and a light source, where the reflective layer and the light guiding layer are disposed on each other, the light source is disposed on at least one side of the light guiding layer, the light source is configured to emit the second backlight into the light guiding layer, the light guiding layer is configured to guide the second backlight, and the reflective layer is configured to reflect the second backlight toward the direction of the first light-emitting portion.

According to the backlight module provided by the embodiment of the application, the flexibility of selecting the light source of the second light-emitting part is improved by setting different working modes of the light-emitting panel, so that the flexibility and operability of the whole backlight module are improved.

In an embodiment, the second light emitting part further includes a second diffusion plate for receiving and diffusing the second backlight.

According to the backlight module provided by the embodiment of the application, the second diffusion plate is arranged on the second light-emitting part, and the second backlight passing through the second diffusion plate is atomized by refraction and reflection, so that a uniform surface light source is provided for the emergent light of the backlight module, the uniformity of the light source is improved, and the backlight module has a better display effect.

The second aspect of the present application provides a display module using the above backlight module, including:

the backlight module of any one of the embodiments above; and

the display liquid crystal box is used for receiving the light emitted by the backlight module and modulating the first backlight or the second backlight into image light;

wherein in the second state, a diffusion angle of the image light in the first direction is smaller than a diffusion angle of the image light in the first direction in the first state.

According to the display module provided by the embodiment of the application, the backlight module of any embodiment is arranged, so that the switchability between the privacy mode and the sharing mode is realized, the problem that the privacy mode of the display module can only be changed to a liquid crystal box is solved simply, conveniently and easily, the production of the peep-proof display module is mastered in a liquid crystal panel production factory, the technical barrier is reduced, and the cost is reduced.

A third aspect of the application provides a vehicle comprising:

the driving seat and the assistant driving seat are arranged side by side; and

the display module of any one of the above embodiments is disposed corresponding to the co-driver seat, so that a user sitting in the co-driver position can receive the image light;

in the first state, a user sitting on the driving seat can receive the image light emitted by the display module; in the second state, the user sitting on the driver seat cannot receive the image light emitted from the display module.

The vehicle has the display module set according to the second aspect and the backlight module set according to the first aspect, so that the vehicle also has the same beneficial effects, and will not be described herein.

Drawings

Fig. 1 is a schematic diagram of a backlight module in a first state according to an embodiment of the application.

Fig. 2 is a schematic diagram of a backlight module in a second state according to an embodiment of the application.

Fig. 3 is a schematic diagram of a backlight module in a second state according to another embodiment of the application.

Fig. 4 is a schematic structural diagram of a light modulation panel according to a first embodiment of the present application.

Fig. 5 is a schematic diagram illustrating a change of viewing angle with brightness of a light modulation panel according to a first embodiment of the present application.

Fig. 6 is a schematic structural diagram of a display module according to a first embodiment of the application.

Fig. 7 is a schematic structural diagram of a display module according to a second embodiment of the application.

Fig. 8 is a schematic diagram of a vehicle structure according to a third embodiment of the present application.

Description of the main reference signs

Backlight module 100

First light-emitting part 1

Transparent substrate 10

First LED matrix 11

First backlight 13

First diffusion plate 15

Brightness enhancement sheet 17

Polymer base layer 170

Triangular prism 171

Side edge 171a

Second light emitting part 2

Light-emitting panel 21

Substrate 210

Second matrix 211 of light emitting diodes

Reflective layer 213

Light guiding layer 215

Light source 217

Light modulation panel 23

Outer base plate 230

Diaphragm 231

Shading sheet 233

Transparent resin 233a

Second backlight 25

Second diffusion plate 27

Control module 3

Display module 200

Display liquid crystal cell 201

Image light 203

Vehicle 300

Driving seat 301

Co-driver seat 303

Control system 305

Light emitting diode 4

First direction X

Second direction Y

Diffusion angle theta

Viewing angle beta

The application will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The application will be described in detail below with reference to the drawings and preferred embodiments thereof, in order to further explain the technical means and effects of the application to achieve the intended purpose.

Example 1

Referring to fig. 1 and 2, a backlight module 100 according to an embodiment of the application includes: a first light emitting part 1 including a transparent substrate 10 and a first light emitting diode matrix 11 disposed on one side of the transparent substrate 10, the first light emitting diode matrix 11 being for emitting a first backlight 13; the second light emitting part 2 comprises a light emitting panel 21 and a light modulating plate 23, the second light emitting part 2 is arranged on one side of the first light emitting part 1 far away from the emitting direction of the first backlight 13, the light modulating plate 23 is arranged between the first light emitting part 1 and the light emitting panel 21, the light emitting panel 21 is used for emitting the second backlight 25 towards the direction of the first light emitting part 1, and the light modulating plate 23 is used for reducing the diffusion angle theta of the second backlight 25 in the first direction X; and a control module 3, the control module 3 is electrically connected with the first light emitting part 1 and the second light emitting part 2, and is used for controlling the light emitting states of the first light emitting part 1 and the second light emitting part 2 so as to switch the backlight module 100 between the first state and the second state; wherein, in the first state, the first light emitting part 1 emits the first backlight 13, and the second light emitting part 2 does not emit light; in the second state, the first light emitting portion 1 does not emit light, the second light emitting portion 2 emits the second backlight 25, and the second backlight 25 passes through the first light emitting portion 1.

The material of the transparent substrate 10 may be a transparent material such as transparent glass, polyester, polyimide, or the like. The material of the transparent substrate 10 may be other materials having good electrical characteristics and high light transmittance, and the present application is not limited thereto. The transparent substrate 10 is further provided with a first led matrix 11, so that the transparent substrate 10 is provided with a plurality of wires (not shown) for electrically connecting the first led matrix 11 with the control module 3. The wires (not shown) disposed on the transparent substrate 10 may be made of fine metal or other materials having good conductive properties, such as transparent conductive materials including indium tin oxide, etc., which is not limited by the present application.

Referring to fig. 1, in the present embodiment, a first led matrix 11 is disposed on the light emitting side of the transparent substrate 10, and the first led matrix 11 is formed by a plurality of leds 4, and is used for emitting a first backlight 13 in a first state of the backlight module 100. The light emitting diode 4 has the characteristics of high brightness and moderate cost. In other embodiments, the first led matrix 11 may also include mini leds, which is beneficial to implementing partition adjustment and control on different display areas of the display module, and is beneficial to improving display control flexibility of the display module, which is not limited in the present application.

Specifically, the first light emitting diode matrix 11 includes a plurality of light emitting diodes 4, the first light emitting diode matrix 11 includes a plurality of first dimming blocks (not shown), each first dimming block (not shown) includes at least one light emitting diode 4, and the brightness of each first dimming block (not shown) is individually modulated. By arranging the first dimming blocks (not shown) in the first light emitting diode matrix 11, the brightness of each first dimming block (not shown) can be modulated independently, so that the power consumption can be reduced greatly, the contrast of a display picture can be improved, the gray scale number can be increased, the afterimage can be reduced, and the image quality and the display control flexibility of the display module can be improved.

The control module 3 further includes a control chip (not shown) for determining a light emitting state of the backlight panel, and the control module 3 is electrically connected to the first light emitting part 1 and the second light emitting part 2 (not shown) for controlling the light emitting states of the first light emitting part 1 and the second light emitting part 2. The application does not limit the type of the control chip.

Referring to fig. 1 and 2 together, the first light emitting portion 1 includes a first diffusion plate 15, and the first diffusion plate 15 is disposed on a side of the transparent substrate 10 away from the second light emitting portion 2, and is configured to receive and diffuse the first backlight 13 or the second backlight 25. According to the backlight module 100 provided by the embodiment of the application, the first diffusion plate 15 is arranged on the first light-emitting part 1, and light passing through the first diffusion plate 15 is atomized by refraction and reflection, so that a uniform surface light source is provided for the emergent light of the backlight module 100, and the backlight module 100 has a better display effect.

Referring to fig. 1, 2 and 6, the first light emitting portion 1 further includes a brightness enhancement sheet 17, the brightness enhancement sheet 17 is disposed on a side of the first diffusion plate 15 away from the second light emitting portion 2, and the brightness enhancement sheet 17 is configured to receive and amplify the first backlight 13 or the second backlight 25. By arranging the brightness enhancement sheet 17 on the first light-emitting part 1, the brightness passing through the first light-emitting part 1 is enhanced, so that the display effect of the backlight module 100 is improved, and the use experience of a user is improved.

Referring to fig. 1, 2 and 6, in the present embodiment, the brightness enhancement sheet 17 includes a polymer substrate 170 and a plurality of triangular prisms 171 disposed on the polymer substrate 170 in parallel along a first direction X, and the brightness enhancement sheet 17 is used to modulate the first backlight 13 or the second backlight 25 so that the brightness of the first backlight 13 or the second backlight 25 in the axial direction of the triangular prisms 171 is enhanced. The triangular prism 171 is composed of acrylic resin, which has good light and color retention, water and chemical resistance, quick drying, convenient construction, and easy construction. The triangular prism 171 is bonded to the polymer base 170 by an adhesive. When the light source passes through the polymer base layer 170 of the brightness enhancement sheet 17, the light intensity distribution is controlled through refraction, total reflection, light accumulation and the like when passing through the fine triangular prism 171 structure of the surface layer, the light is reflected to a specific angle, the light scattered by the light source is concentrated to the front, the recycling of the unutilized light is realized through reflection, the light loss is reduced, the overall brightness and uniformity are improved, and the effects of increasing the brightness and controlling the visual angle are played for the backlight module display. When the side edges 171a of the triangular prism 171 are perpendicular to the first direction X, i.e., the axis (not shown) of the brightness enhancement film is 90 ° to the first direction X, the illumination brightness in the axial direction of the brightness enhancement film is enhanced when the light source passes through the brightness enhancement sheet 17, i.e., if the diffusion angle θ of the second backlight 25 in the first direction X is converged at this time, the brightness of the second backlight 25 perpendicular to the first direction X is enhanced. When the side edges 171a of the triangular prism 171 are parallel to the first direction X, that is, the axis (not shown) of the brightness enhancement film is 0 ° to the first direction X, the illumination brightness in the axial direction of the brightness enhancement film is enhanced when the light source passes through the brightness enhancement sheet 17, and the brightness of the second backlight 25 parallel to the first direction X is enhanced. In other embodiments, the brightness enhancement plates 17 having different axial directions may be used simultaneously, or a plurality of brightness enhancement plates 17 having the same direction or different axial directions may be used, which is not limited by the present application.

Referring to fig. 2 and fig. 4 together, the light modulation board 23 includes an outer substrate 230 disposed on two sides of the light modulation board 23 and a membrane 231 disposed between the outer substrates 230, and a plurality of light shielding sheets 233 arranged in parallel along a first direction X are disposed on the membrane 231. The light modulation panel 23 is used for adjusting the light transmittance for reducing the diffusion angle θ of the second backlight 25 in the first direction X. The outer substrate 230 is a rigid material or a flexible material, and the outer substrate 230 and the membrane 231 are connected by a composite membrane adhesive without limitation of the present application. The light shielding sheets 233 arranged in parallel are made of light-impermeable light-absorbing materials for absorbing light incident into the light shielding sheets 233, and the light shielding sheets 233 may be made of polycarbonate or other light-impermeable light-absorbing materials, which is not limited by the present application. The light shielding sheets 233 arranged in parallel are filled with the transparent resin 233a therebetween, and the transparent resin 233a has a strong light transmittance so that light loss of the unabsorbed second backlight 25 when passing through the light modulation panel 23 is reduced as much as possible.

Referring to fig. 2, 4 and 5, a diffusion angle θ between the second backlight 25 passing through the light modulation panel 23 and the first direction X is complementary to an observation angle β between the second backlight 25 passing through the light modulation panel 23 and the first direction Y, wherein the second direction Y is perpendicular to the first direction X, and the abscissa is an observation angle β between the second backlight 25 passing through the light modulation panel 23 and the second direction Y, and the ordinate is a percentage of the brightness of the second backlight 25 passing through the light modulation panel 23 and the brightness of the second backlight 25 before passing through the light modulation panel 23. As the viewing angle β increases, the luminance increases and decreases, and when the viewing angle β is in the range of-30 ° to 30 °, the percentage of luminance reaches the peak. When the observation angle β is larger than 30 °, the percentage of brightness is reduced to 5% or less, and it is considered that light cannot pass through the light modulation panel 23 at this observation angle. In the present embodiment, the diffusion angle θ of the second backlight 25 emitted from the light modulation panel 23 and the first direction X is 60 ° to 120 °. Light within the range can normally pass through the light modulation panel 23, and light outside the range is absorbed by the light shielding sheet 233 through the light modulation panel 23.

According to the backlight module 100 provided by the embodiment of the application, the diaphragm 231 is arranged on the light modulation plate 23, so that part of the second backlight 25 can normally emit light with the diffusion angle theta between the second backlight 25 and the first direction X of 60-120 degrees through the light modulation plate 23, and the diffusion angle theta of the second backlight 25 in the first direction X is reduced by the light modulation plate 23, so that the brightness of the second backlight 25 outside the effective range of the emission angle of the light modulation plate 23 is effectively reduced.

Referring to fig. 2 again, in the present embodiment, the light emitting panel 21 includes a substrate 210 and a second light emitting diode matrix 211 disposed on the substrate 210, the second light emitting diode matrix 211 includes a plurality of light emitting diodes 4, and the second light emitting diode matrix 211 is used for emitting the second backlight 25. The second light emitting diode matrix 211 includes a plurality of second dimming blocks (not shown), each second dimming block (not shown) includes at least one light emitting diode 4, and the brightness of each second dimming block (not shown) is individually modulated. By arranging the second dimming blocks (not shown) in the second light emitting diode matrix 211, the brightness of each second dimming block (not shown) can be modulated independently, so that the contrast of a display picture can be improved, the gray scale number can be increased, the afterimage can be reduced, and the image quality and the display control flexibility of the display module can be improved.

Referring to fig. 3, in other embodiments, the light-emitting panel 21 includes a reflective layer 213, a light guiding layer 215, and a light source 217, where the reflective layer 213 and the light guiding layer 215 are stacked, the light source 217 is disposed on at least one side of the light guiding layer 215, the light source 217 is configured to emit the second backlight 25 into the light guiding layer 215, the light guiding layer 215 is configured to guide the second backlight 25, and the reflective layer 213 is configured to reflect the second backlight 25 toward the first light-emitting portion 1. Specifically, the direction of the light source 217 is modified by the reflective layer 213, so that the light source 217 is concentrated in front, and the light not used outside the viewing angle can be recovered and utilized, and the overall brightness and uniformity are improved, so as to achieve the brightness enhancement effect. The light source 217 is composed of a plurality of light emitting diodes 4, and is used for emitting the second backlight 25 in the second state of the backlight module 100. The light emitting diode 4 has the characteristics of high brightness and moderate cost. In other embodiments, the light source 217 may also use a cold cathode fluorescent lamp as the light source or a mini light emitting diode, which is not limited by the present application.

According to the backlight module 100 provided by the embodiment of the application, the flexibility of selecting the light source of the second light emitting part 2 is improved by setting different working modes of the light emitting panel 21, so that the flexibility and operability of the whole backlight module 100 are improved.

The second light emitting part 2 further includes a second diffusion plate 27, and the second diffusion plate 27 is configured to receive and diffuse the second backlight 25. According to the backlight module 100 provided by the embodiment of the application, the second diffusion plate 27 is arranged on the second light-emitting part 2, and the second backlight 25 passing through the second diffusion plate 27 is atomized by refraction and reflection, so that a uniform surface light source is provided for the emergent light of the backlight module 100, and the uniformity of a light source is improved, so that the backlight module 100 has a better display effect.

According to the backlight module 100 provided by the embodiment of the application, the first light-emitting part 1 and the second light-emitting part 2 are arranged, so that the backlight module 100 can be switched between the first state and the second state at will: in the first state, the first light emitting part 1 emits the first backlight 13, the second light emitting part 2 does not emit light, and the backlight module 100 is in the sharing mode, that is, the first backlight 13 has a uniform and large diffusion angle θ, and the first backlight 13 can be received from any direction on the light emitting surface of the backlight module 100; in the second state, the first light emitting part 1 does not emit light, the second light emitting part 2 emits the second backlight 25, and the diffusion angle θ of the second backlight 25 in the first direction X decreases after being emitted through the light modulation panel 23, so that the second backlight 25 can be received within a specific range in the first direction X, that is, the backlight module 100 is in the privacy mode. The backlight module 100 provided by the application has the advantages that the light modulation plate 23 is arranged, the diffusion angle theta of backlight is not required to be controlled by adding one liquid crystal module, the cost is low, the operation is convenient, and different states can be randomly switched, so that the peep-proof function of a switchable mode can be realized.

Example two

Referring to fig. 7, a second embodiment of the present application provides a display module 200 using the backlight module 100, including: the backlight module 100 of any of the above embodiments; and a display liquid crystal cell 201, wherein the display liquid crystal cell 201 is used for receiving the light emitted by the backlight module 100 and modulating the first backlight 13 or the second backlight (not shown) into image light 203; in the second state, the diffusion angle θ of the image light 203 in the first direction X is smaller than the diffusion angle of the image light 203 in the first direction X in the first state. Specifically, the first backlight 13 or the second backlight (not shown) is guided to the back surface of the display liquid crystal cell 201 by the backlight module 100. The liquid crystal molecules of the display cell 201 are changed according to the external electric field, which causes the polarization direction of the first backlight 13 or the second backlight (not shown) to be changed, thereby controlling the transmission and blocking of light rays and finally forming visible image light 203.

According to the backlight module 100 provided by the embodiment of the application, by arranging the backlight module 100 of any embodiment, the backlight module 100 of any embodiment can be randomly switched between the first state and the second state, so that the switchability between the privacy mode and the sharing mode is realized, and the diffusion angle of backlight is not required to be controlled by adding a liquid crystal module. The problem that the privacy mode of the display module 200 can only be changed by the liquid crystal box is solved simply and easily, so that the production of the peep-proof display module is mastered in a panel factory, the technical barrier is reduced, the cost is reduced, the operation is convenient, and the peep-proof function of the switchable mode can be realized by randomly switching different states.

Example III

A third embodiment of the present application provides a vehicle. Referring to fig. 8, a vehicle 300 includes: a driver seat 301 and a passenger seat 303, the driver seat 301 and the passenger seat 303 being arranged side by side; and the display module 200 of any of the above embodiments, the display module 200 is disposed corresponding to the passenger seat 303, so that the user sitting on the passenger seat 303 can receive the image light 203; in the first state, a user sitting on the driver seat 301 can receive the image light 203 emitted from the display module 200; in the second state, the user sitting on the driver seat 301 cannot receive the image light 203 emitted from the display module 200. In the present embodiment, the vehicle 300 may be an electric vehicle, an automobile, a diesel vehicle, or the like, and the present application is not limited thereto.

During the running process of the vehicle 300, the control system 305 in the vehicle 300 detects the current running state, and when the control system 305 detects that the co-driver seat 303 region starts the display module 200, the control system 305 directly starts the privacy mode of the display module 200, so that the driving safety is ensured; when the control system 305 detects the present non-driving state, the control system 305 turns off the privacy mode, and at this time, the privacy mode or the sharing mode may be selectively switched, thereby further ensuring the driving safety of the vehicle 300.

The vehicle 300 has the display module 200 of the second embodiment and the backlight module (not shown) of the first embodiment, and thus has the same advantages, for example, the display module 200 of the passenger seat 303 is provided with a peep-proof function for preventing the driver from being distracted during the running of the vehicle 300. The conventional peep-proof display device mainly adds a birefringence control type liquid crystal box on the basis of the original display module 200, and changes the visual angle by controlling the liquid crystal direction. The disadvantage of the prior art is the high cost of the finished product. The vehicle 300 provided by the embodiment of the application realizes the switchability of the privacy mode and the sharing mode by arranging the display module 200, does not need to increase a liquid crystal module to control the diffusion angle theta of backlight, and solves the problem that the privacy mode of the display module 200 can only change the liquid crystal box simply and easily.

It will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the application and are not to be construed as limiting the application, and that suitable modifications and variations of the above embodiments are within the scope of the application as claimed.

Claims

1. A backlight module, characterized in that it includes:

The first light-emitting part includes a transparent substrate and a first light-emitting diode matrix disposed on one side of the transparent substrate, where the first light-emitting diode matrix is used to emit a first backlight;

The second light-emitting part includes a light-emitting panel and a light modulation plate. The second light-emitting part is disposed on a side of the first light-emitting part away from the first backlight emission direction. The light modulation plate is disposed on the first backlight. Between a light-emitting part and the light-emitting panel, the light-emitting panel is used to emit the second backlight in the direction of the first light-emitting part, and the light modulation plate is used to reduce the second backlight in the first direction. the spread angle of

A control module, the control module is electrically connected to the first light-emitting part and the second light-emitting part, and is used to control the light-emitting state of the first light-emitting part and the second light-emitting part, so that the backlight module is in Switch between the first state and the second state;

Wherein, in the first state, the first light-emitting part emits the first backlight, and the second light-emitting part does not emit light; in the second state, the first light-emitting part does not emit light, and the second light-emitting part The second backlight emits the second backlight, and the second backlight passes through the first light-emitting part.

2. The backlight module of claim 1, wherein the light modulation plate includes outer substrates disposed on both sides of the light modulation plate and a diaphragm disposed between the outer substrates, The diaphragm is provided with a plurality of light-shielding sheets arranged in parallel along the first direction.

3. The backlight module of claim 1, wherein the diffusion angle of the second backlight emitted from the light modulation plate and the first direction is 60°-120°.

4. The backlight module of claim 1, wherein the first light-emitting part includes a first diffusion plate, and the first diffusion plate is disposed on a side of the transparent substrate away from the second light-emitting part. side for receiving and diffusing the first backlight or the second backlight.

5. The backlight module of claim 4, wherein the first light-emitting part further includes a brightness enhancement sheet, and the brightness enhancement sheet is disposed on the first diffusion plate away from the second light-emitting part. On one side, the brightness enhancement sheet is used to receive and amplify the first backlight or the second backlight.

6. The backlight module of claim 5, wherein the brightness enhancement sheet includes a polymer base layer and a plurality of triangular prisms arranged in parallel along the first direction on the polymer base layer, and the brightness enhancement sheet The sheet is used to modulate the first backlight or the second backlight, so that the brightness of the first backlight and the second backlight in the axial direction of the triangular prism is enhanced.

7. The backlight module of claim 1, wherein the first LED matrix includes a plurality of LEDs, and the first LED matrix includes a plurality of first dimming blocks, each of which The first dimming block includes at least one light emitting diode, and the brightness of each first dimming block can be individually modulated.

8. The backlight module of claim 1, wherein the light-emitting panel includes a substrate and a second light-emitting diode matrix disposed on the substrate, and the second light-emitting diode matrix includes a plurality of light-emitting diodes, The second LED matrix is used to emit the second backlight.

9. The backlight module of claim 8, wherein the second LED matrix includes a plurality of second dimming blocks, and each of the second dimming blocks includes at least one of the light-emitting diode, the brightness of each second dimming block can be individually modulated.

10. The backlight module of claim 1, wherein the light-emitting panel includes a reflective layer, a light guide layer and a light source, the reflective layer and the light guide layer are stacked, and the light source is provided on the At least one side of the light guide layer, the light source is used to emit the second backlight into the light guide layer, the light guide layer is used to guide the second backlight, and the reflective layer is used to convert the second backlight into the light guide layer. The second backlight is reflected in the direction of the first light emitting part.

11. The backlight module of claim 1, wherein the second light-emitting part further includes a second diffusion plate, the second diffusion plate being used to receive and diffuse the second backlight.

12. A display module, characterized in that it includes:

The backlight module according to any one of claims 1-11; and

A display liquid crystal cell, the display liquid crystal cell is used to receive the light emitted from the backlight module, and to modulate the first backlight or the second backlight into image light;

Wherein, in the second state, the diffusion angle of the image light in the first direction is smaller than the diffusion angle of the image light in the first direction in the first state.

13. A vehicle, characterized in that it includes:

A driver's seat and a passenger's seat, the driver's seat and the passenger's seat being arranged side by side; and

The display module according to claim 12, the display module is arranged corresponding to the passenger seat so that a user sitting in the passenger seat can receive the image light;

In the first state, a user sitting on the driver's seat can receive the image light emitted by the display module;

In the second state, the user sitting on the driver's seat cannot receive the image light emitted by the display module.