CN114545679A

CN114545679A - Display device

Info

Publication number: CN114545679A
Application number: CN202011334023.8A
Authority: CN
Inventors: 翟玉帅; 高上; 练飞
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-05-27

Abstract

The invention discloses a display device, comprising: a display panel for image display; the backlight module is positioned at the light incidence side of the display panel and used for providing backlight; the backlight module includes: a first light source for providing a backlight in a first display mode; a second light source for providing backlight in a second display mode; the first display mode is different from the second display mode, thereby adapting the display device to different display requirements.

Description

Display device

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

The liquid crystal display screen has the advantages of low power consumption, small volume, low radiation and the like as the current mainstream display screen. The liquid crystal display panel is a non-self-luminous panel and needs to be matched with a backlight module for use.

Along with the continuous improvement of user to the display performance demand, not only have higher requirement to the display effect of display screen, also pay close attention to the eyeshield requirement of product more and more simultaneously.

However, the current display screen usually cannot meet the eye protection standard when meeting the color gamut requirement, and the display color gamut is reduced after meeting the eye protection standard, and the current display screen and the display color gamut cannot be obtained at the same time.

Disclosure of Invention

In some embodiments of the present invention, a display panel for image display; the backlight module is positioned at the light incidence side of the display panel and used for providing backlight; the backlight module includes: a first light source for providing a backlight in a first display mode; a second light source for providing backlight in a second display mode; the first display mode is different from the second display mode, thereby adapting the display device to different display requirements.

In some embodiments of the invention, the percentage of light energy having a wavelength between 415nm and 455nm in the spectrum of the first light source in light energy having a wavelength between 400nm and 500nm is greater than the percentage of light energy having a wavelength between 415nm and 455nm in the spectrum of the second light source in light energy having a wavelength between 400nm and 500 nm. Therefore, the first light source is more suitable for the high color gamut display mode, and the second light source is more suitable for the eye protection display mode.

In some embodiments of the invention, the spectrum of the first light source meets the DCI-P3 color gamut standard of greater than or equal to 90%; the second light source has a spectrum such that light energy having a wavelength of 415nm to 455nm is less than 50% of light energy having a wavelength of 400nm to 500 nm. Two kinds of light sources are integrated in the backlight module, when the display device is switched to a high color gamut display mode, the first light source is driven to provide backlight, and when the display device is switched to an eye protection display mode, the second light source is driven to provide backlight, so that the switching of the high color gamut display mode and the eye protection display mode is achieved, and two display requirements are met in one display device.

In some embodiments of the invention, the first light source and the second light source are both light emitting diodes; the light emitting diode includes: the light emitting chip is used for emitting exciting light with set wavelength; the fluorescent powder is positioned on the light emitting side of the light emitting chip and used for generating light with other wavelengths under the excitation of the exciting light; and the packaging support is used for packaging the light-emitting chip and the fluorescent powder.

In some embodiments of the present invention, a light emitting chip is packaged in a package support; or at least two light-emitting chips are packaged in one packaging support, and the light-emitting chips in one packaging support are light-emitting chips of the same light source or light-emitting chips of different light sources. The at least two light-emitting chips are packaged in the same packaging support, so that the times of surface mounting can be reduced, and the production is easier.

In some embodiments of the present invention, the first light source comprises a first light emitting chip; the emergent wavelength of the first luminescent chip is 450nm-455nm, and the fluorescent powder positioned at the light emergent side of the first luminescent chip is yttrium aluminum garnet fluorescent powder or fluoride fluorescent powder.

In some embodiments of the present invention, the second light source comprises a second light emitting chip; the emergent wavelength of the second light-emitting chip is 457.5nm-462.5nm, and the fluorescent powder positioned at the light-emitting side of the second light-emitting chip is yttrium aluminum garnet fluorescent powder or fluoride fluorescent powder; or the emergent wavelength of the second light-emitting chip is 410nm-415nm, and the fluorescent powder positioned at the light-emitting side of the second light-emitting chip is a mixture of blue fluorescent powder, green fluorescent powder, red fluorescent powder and yellow fluorescent powder.

In some embodiments of the present invention, the first light sources and the second light sources are arranged in an array along a first direction and a second direction that intersect each other; the first light sources and the second light sources are alternately arranged along a first direction and alternately arranged along a second direction; or the first light sources are arranged into a plurality of straight lines along the first direction, the second light sources are arranged into a plurality of straight lines along the first direction, and the straight lines formed by the first light sources and the straight lines formed by the second light sources are alternately arranged along the second direction.

In some embodiments of the present invention, the backlight module further comprises: a light guide plate for guiding light; the first light source and the second light source are positioned on the light incident side of the light guide plate.

In some embodiments of the present invention, the light guide plate includes a light incident surface; the first light sources and the second light sources are alternately arranged in a straight line along the light incident surface of the light guide plate.

In some embodiments of the present invention, the light guide plate includes at least a first light incident surface and a second light incident surface which are oppositely disposed; the first light sources are arranged in a straight line along the first light incident surface; the second light sources are arranged in a straight line along the second light incident surface.

In some embodiments of the present invention, the light guide plate further includes a third light incident surface and a fourth light incident surface which are oppositely disposed; the second light sources are arranged in a straight line along the third light incident surface and the fourth light incident surface respectively.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;

fig. 2 is a schematic top view of a backlight module according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a light emitting diode according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating a packaging method of a light emitting diode according to an embodiment of the invention;

fig. 5 is a second schematic view illustrating a package of a light emitting diode according to an embodiment of the invention;

fig. 6 is a third schematic view illustrating a packaging method of a light emitting diode according to an embodiment of the invention;

FIG. 7 is a spectrum diagram of a first light source provided by an embodiment of the invention;

FIG. 8 is a diagram of a second light source according to an embodiment of the present invention;

FIG. 9 is a second spectrum diagram of a second light source according to an embodiment of the present invention;

fig. 10 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;

fig. 11 is a schematic diagram of connection between a first light source and a second light source according to an embodiment of the present invention;

fig. 12 is a second schematic connection diagram of the first light source and the second light source according to the embodiment of the invention;

fig. 13 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention;

fig. 14 is a third schematic diagram illustrating a connection between the first light source and the second light source according to the embodiment of the invention;

fig. 15 is a fourth schematic view illustrating a connection between the first light source and the second light source according to the embodiment of the invention;

fig. 16 is a fifth schematic view of the connection between the first light source and the second light source according to the embodiment of the invention.

The backlight module comprises a backlight module 100, a display panel 200, a first light source 11, a second light source 12, a backboard 13, a circuit board 14, a reflector plate 15, a diffuser plate 16, an optical film 17, a light guide plate 18, a light emitting chip 111, fluorescent powder 112, a packaging support 113, a first light incoming surface 181, a second light incoming surface 182, a third light incoming surface 183 and a fourth light incoming surface 184.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words indicating positions and directions in the present invention are illustrated by way of example in the accompanying drawings, but may be changed as required and are within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.

The liquid crystal display mainly comprises a backlight module and a liquid crystal display panel. The liquid crystal display panel does not emit light, and brightness display needs to be realized by a light source provided by the backlight module.

The display principle of the liquid crystal display is that liquid crystal is placed between two pieces of conductive glass, and the electric field effect of liquid crystal molecule distortion is caused by the driving of an electric field between two electrodes so as to control the transmission or shielding function of a backlight source, thereby displaying an image. If a color filter is added, a color image can be displayed.

Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.

Referring to fig. 1, the display device includes: the backlight module 100 is used for providing backlight to the display panel 200, and the display panel 200 is used for displaying images.

The backlight module 100 is generally disposed at the bottom of the display device, and has a shape and size corresponding to those of the display device. When applied to the field of televisions or mobile terminals, the backlight module generally takes a rectangular shape.

The backlight module in the embodiment of the invention adopts the direct type backlight module, is used for uniformly emitting light rays in the whole light emitting surface, and provides light rays with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.

The display panel 200 is located at the light-emitting side of the backlight module 100, and the shape and size of the display panel are generally matched with those of the backlight module. In general, the display panel 200 may be configured in a rectangular shape including a top side, a bottom side, a left side and a right side, wherein the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the left side and one side of the right side, and the bottom side is connected to the other end of the left side and the other end of the right side.

The display panel 200 is a transmissive display panel, which can modulate the transmittance of light, but does not emit light by itself. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.

Fig. 2 is a schematic top view of a backlight module according to an embodiment of the invention.

Referring to fig. 2, the backlight module provided in the embodiment of the present invention includes: a first light source 11 and a second light source 12. The first light source 11 is used for providing backlight in the first display mode, and the second light source 12 is used for providing backlight in the second display mode. Therefore, the display device can integrate two display modes and adapt to different display requirements.

In a specific implementation, the first display mode may be a high color gamut display mode, and the second display mode may be an eye protection display mode. Then, in order to meet the requirements of the high color gamut display mode and the eye-protection display mode, the proportion of the light energy with the wavelength of 415nm to 455nm in the spectrum of the first light source in the light energy with the wavelength of 400nm to 500nm is different from the proportion of the light energy with the wavelength of 415nm to 455nm in the spectrum of the second light source in the light energy with the wavelength of 400nm to 500 nm.

When the proportion of the light energy with the wavelength of 415nm-455nm in the blue light in the light energy with the wavelength of 400nm-500nm is less than 50%, the damage to eyes can be reduced, so that the light source meets the eye protection standard, however, the color gamut of the display panel is reduced, and the display requirement of high color gamut cannot be met. Therefore, the embodiment of the invention adopts two light sources, and the blue light energy is respectively adjusted aiming at the high color gamut display mode and the eye protection display mode so as to meet different display requirements.

In the embodiment of the present invention, the spectrum of the first light source 11 meets the requirement that the DCI-P3 color gamut standard is greater than or equal to 90%; the spectrum of the second light source 12 meets the requirement that the light energy with the wavelength of 415nm-455nm accounts for less than 50% of the light energy with the wavelength of 400nm-500 nm. Therefore, when the first light source 11 is used for providing backlight, the display device can display images with high color gamut, and when the second light source 12 is used for providing backlight, the emergent light of the display device can meet the requirement of eye protection.

The display device provided by the embodiment of the present disclosure drives the first light source 11 to provide backlight in the high color gamut display mode, and drives the second light source 12 to provide backlight in the eye protection display mode, so that one display device can achieve the purpose of two display requirements.

In the embodiment of the present invention, both the first Light source 11 and the second Light source 12 may adopt Light Emitting Diodes (LEDs), which has the advantages of high backlight brightness and no reduction of brightness even after long-term use.

Fig. 3 is a schematic structural diagram of a light emitting diode according to an embodiment of the present invention.

Referring to fig. 3, the light emitting diode includes: a light emitting chip 111, a phosphor 112 and a package support 113.

The light emitting chip 111 and the phosphor 112 are disposed in a package support 113, and the package support 113 packages and protects the light emitting chip 111. The light emitting chip 111 is used for emitting exciting light with a set wavelength; the phosphor 112 is located on the light emitting side of the light emitting chip 111, and generates light of other wavelengths under excitation of the excitation light, thereby mixing into white light for the backlight of the display panel 200.

In the embodiment of the present invention, the backlight module includes the first light source 11 and the second light source 12, and the peak wavelengths of the light emitting chips included in the first light source 11 and the second light source 12 are all different, so that the two light sources can provide backlight in different display modes, so that the display device can be switched between the high color gamut display mode and the eye protection display mode.

Currently, the major eye protection certificates in the display field are the seich certificate, the seebao certificate, and the rhine certificate. The proportion of light energy of 415nm-455nm blue light in 400nm-500nm blue light is required to be less than 50% in the eye protection mode. And the requirement of the high color gamut display mode to meet the DCI-P3 color gamut standard is more than or equal to 90 percent.

In order to satisfy two display requirements at the same time, the backlight module according to the embodiment of the invention is provided with two light sources, and the blue light energy emitted by the first light source 11 and the blue light energy emitted by the second light source 12 are different, so that the corresponding light sources can be driven to provide backlight in different display modes.

Fig. 4-6 are schematic views illustrating a packaging method of a light emitting diode according to an embodiment of the invention.

The light-emitting diode needs to be packaged in the manufacturing process, then the light-emitting diode is electrically connected onto the circuit board in a surface mounting mode, the surface mounting process of each light-emitting chip is more complicated in the mode that each light-emitting chip is packaged independently, and if at least two light-emitting chips are packaged in the same packaging support, the surface mounting times can be reduced, and production and processing are facilitated.

In the embodiment of the present invention, one light emitting chip 111 may be packaged in one package support 113; or, at least two light emitting chips 111 may be packaged in one package support 113, and the light emitting chips packaged in the same package support may be the same type of light emitting chip or different types of light emitting chips.

Referring to fig. 4, two identical light emitting chips 111 may be packaged in the same package support, and the two light emitting chips 111 are connected in series, and after the LED is mounted on a circuit board, the LED may be driven simultaneously.

Referring to fig. 5, two identical light emitting chips 111 are also packaged in the same package support, and the two light emitting chips 111 are connected in parallel, so that the LED can be driven simultaneously after being mounted on a circuit board.

Referring to fig. 6, two different types of light emitting chips may be packaged in the same package support, that is, the first light emitting chip 111a and the second light emitting chip 111b are packaged in the same package support, the two first light emitting chips 111a and the second light emitting chip 111b are respectively connected to different electrodes, and after the LED is mounted on the circuit board, the two light emitting chips may be respectively driven according to a circuit designed by the circuit board.

The type of light emitting diode used in embodiments of the present invention is illustrated below.

The first light source 11 is a white LED, and includes a first light emitting chip 111a, where the first light emitting chip 111a is a blue light emitting chip, an emission wavelength of the first light emitting chip 111a is 450nm to 455nm, and the phosphor on the light emitting side of the first light emitting chip 111a is Yttrium Aluminum Garnet (YAG) phosphor or fluoride phosphor.

Fig. 7 is a spectrum diagram of the first light source according to an embodiment of the present invention.

Referring to fig. 7, the peak wavelength of blue light emitted from the white LED is 450nm to 455nm, and the light energy in the wavelength range of 415nm to 455nm accounts for more than 50% of the total light energy in the wavelength range of 400nm to 500nm, so that the eye protection standard of rhine certification cannot be achieved, however, the DCI-P3 color gamut standard of the white LED is greater than 90%, and the NTSC color gamut standard is greater than 72%, so that the white LED has high color gamut performance. Embodiments of the invention may thus use the first light source for the high color gamut display mode.

The second light source 12 includes a second light emitting chip 111b, the second light emitting chip 111b is also a blue light emitting chip, the emission wavelength of the second light emitting chip 111b is 457.5nm to 462.5nm, and the phosphor on the light emitting side of the second light emitting chip 111b is Yttrium Aluminum Garnet (YAG) phosphor or fluoride phosphor.

Fig. 8 is a spectrum diagram of the second light source according to an embodiment of the present invention.

Referring to fig. 8, the peak wavelength of the blue light emitted from the white LED is 457.5nm to 462.5nm, and the peak wavelength shifts to the long wavelength direction and cuts off to 462.5nm relative to the first light source shown in fig. 7, so that the proportion of the light energy in the wavelength range of 415nm to 455nm to the total light energy in the wavelength range of 400nm to 500nm is less than 50%, and the eye protection standard certified by rhein is met, however, the color gamut of the white LED is reduced and cannot reach the DCI-P3 color gamut standard. Therefore, the embodiment of the invention uses the long wavelength white light LED in an eye protection display mode.

Or the emission wavelength of the second light emitting chip 111b is 410nm to 415nm, and the phosphor located at the light emitting side of the second light emitting chip 111b is a mixture of blue phosphor, green phosphor, red phosphor and yellow phosphor. For example, the blue phosphor can be phosphate blue powder (emitting wavelength of 455nm), phosphate blue powder (emitting wavelength of 485 nm); the green phosphor can adopt YAG green powder (emission wavelength is 530 nm); the red phosphor can adopt nitride red powder (with the emission wavelength of 655 nm); YAG yellow powder (emission wavelength 570nm) can be used as the yellow fluorescent powder, and the various fluorescent powders are mixed according to a set proportion, so that white light conforming to natural spectrum can be excited.

Fig. 9 is a spectrum diagram of the second light source according to an embodiment of the present invention.

Referring to fig. 9, the spectrum of the white LED is closer to the natural spectrum, and is greatly different from the spectrum of the two light sources shown in fig. 7 and 8, the wavelength range of the blue light is shifted to about 410nm, and the energy is low, and the spectrum is in a continuous state and is close to the spectrum of the sunlight in the visible light band. Therefore, the white light LED can meet the eye protection standard and can be used in an eye protection display mode.

In specific implementation, the first light source 11 and one of the second light sources 12 may be integrated in a backlight module, and when the display device is switched to the high color gamut display mode, the first light source 11 is driven to provide backlight, and when the display device is switched to the eye protection display mode, the second light source 12 is driven to provide backlight, so that the switching between the high color gamut display mode and the eye protection display mode is achieved, and two display requirements are met in one display device.

In the embodiment of the invention, the backlight module can be a direct type backlight module.

Fig. 10 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention.

Referring to fig. 10, the backlight module further includes: a back plate 13, a circuit board 14, a first light source 11, a second light source 12, a reflection sheet 15, a diffusion plate 16, and an optical film 17.

The back plate 13 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 13 is typically a square structure, the shape of which is adapted to the shape of the display device when applied to a profiled display device. The back panel 13 includes a top side, a bottom side, a left side, and a right side. Wherein the antenna side is opposite to the ground side, the left side is opposite to the right side, the antenna side is connected with one end of the left side and one side of the right side respectively, and the ground side is connected with the other end of the left side and the other end of the right side respectively.

The circuit board 14 is located on the back plate 13, and the shape of the circuit board 14 is the same as the overall shape of the back plate 13. In general, the circuit board 14 has a plate shape, and has a rectangular or square shape as a whole.

In the embodiment of the present invention, the Circuit Board 14 may be a Printed Circuit Board (PCB), where the PCB includes an electronic Circuit and an insulating layer, and the insulating layer exposes a pad of the electronic Circuit, which is used for soldering the light source, to the outside and covers the rest of the electronic Circuit.

Alternatively, the circuit board 14 may be an array substrate formed by fabricating a thin film transistor driving circuit on a substrate, and the surface of the array substrate has a connection electrode connected to the thin film transistor driving circuit for soldering a light source.

The substrate or the substrate base plate of the above circuit board 121 may be made of a flexible material to form a flexible display device.

The circuit board 14 is used for providing driving electric signals for the first light source 11 and the second light source 12. The surface of the circuit board 14 includes a plurality of pads for soldering the light sources, and the first light source 11 and the second light source 12 may be connected above the circuit board 14 in a patch manner, so that the first light source 11 and the second light source 12 may be driven to emit light by controlling an input signal of the circuit board 14.

The reflective sheet 15 is located on a surface of the circuit board 14 on a side close to the first light source 11 and the second light source 12. The reflective sheet 15 has the same shape as the circuit board 14, and the reflective sheet 15 includes a plurality of openings for exposing the first and second

light sources

11 and 12.

The reflective sheet 15 has a property of reflecting light, so that when the light emitted from the first light source 11 or the second light source 12 is reflected by the elements in the backlight module to the back plate side, the light can be reflected by the reflective sheet 15 to the light emitting side again, thereby improving the utilization efficiency of the light source.

The diffusion plate 16 is located on the light emitting side of the first light source 11 and the second light source at a set distance from the first light source 11 and the second light source. The diffuser plate 16 is provided in a layer and has the same shape as the circuit board 14. The diffuser plate 16 may be generally rectangular or square in configuration.

The diffuser plate 16 has a thickness of 1.5mm to 3 mm. The diffusion plate has a high haze and a high uniformity, and can be processed by an extrusion process, and the diffusion plate 16 is made of at least one material selected from polymethyl methacrylate (PMMA), Polycarbonate (PC), polystyrene materials (PS), and polypropylene (PP).

An optical film 17 is located on a side of the diffuser plate 16 facing away from the first and second

light sources

11, 12, and the shape of the optical film 17 is the same as the shape of the diffuser plate 16, and may be generally rectangular or square.

The optical film 17 is usually one or a combination of prism, diffusion, brightness enhancement film, etc. according to the requirement of the backlight module.

In the embodiment of the present invention, the first light source 11 and the second light source 12 may adopt various arrangements and circuit connection manners.

Fig. 11 and 12 are schematic diagrams illustrating connection between a first light source and a second light source according to an embodiment of the present invention.

Referring to fig. 11 and 12, in the direct type backlight module, the first light sources 11 and the second light sources 12 are arranged in an array along a first direction (e.g., a horizontal direction) and a second direction (e.g., a vertical direction) that are crossed with each other, so that the overall brightness of the backlight module can be improved, and the light sources are more uniform.

As shown in fig. 11, the first light sources 11 are arranged in a plurality of lines in the first direction, the second light sources 12 are arranged in a plurality of lines in the first direction, and the lines in which the first light sources 11 are arranged and the lines in which the second light sources 12 are arranged are alternately arranged in the second direction.

The first light source 11 and the second light source 12 are both white LEDs, and the first light source 11 and the second light source 12 may be packaged in a single packaging manner, or two light emitting chips for different display modes may be packaged in a same packaging support.

When the first light sources 11 and the second light sources 12 are packaged separately, each row of the first light sources 11 along the first direction may be a light bar, each row of the second light sources 12 along the first direction may be a light bar, and the light bars formed by the first light sources 11 and the second light sources 12 are arranged alternately. The light source on each light bar can be uniformly driven in a series connection mode, and can also be divided into a plurality of series connection strings to be respectively driven.

The first light source 11 and the second light source 12 may also be soldered on the block-shaped circuit board in an array arrangement manner, and the first light source 11 and the second light source 12 are respectively driven by the circuit connection of the circuit board.

When the two light emitting chips of the first light source 11 and the second light source 12 are packaged in the same package support, as shown in fig. 11, there are two light emitting chips in each LED, but the two light emitting chips can be controlled independently. The same type of light-emitting chips in the same row can be uniformly driven in a serial connection mode, and can also be divided into a plurality of serial strings for respective driving.

Referring to fig. 12, the first light sources 11 and the second light sources 12 may be alternately arranged along the first direction and the second direction, so that the light sources may be more uniformly distributed.

The first light sources 11 and the second light sources 12 can adopt a single-package packaging mode, the first light sources 11 in the same row are connected in series, the second light sources 12 in the same row are connected in series, and series strings formed by the two light sources can be respectively driven. Alternatively, the same light source located in the same row may be driven by a plurality of series-parallel lines, which is not limited herein.

Fig. 13 is a second schematic cross-sectional view of a backlight module according to an embodiment of the invention.

Referring to fig. 13, the backlight assembly further includes: and a light guide plate 18 for guiding light.

The light guide plate 18 is disposed on the back plate 13, the first light source 11 and the second light source 12 are disposed on the light incident side of the light guide plate 18, the reflective sheet 15 is disposed between the light guide plate 18 and the back plate 13, the diffuser plate 16 is disposed on the light emitting side of the light guide plate 18, and the optical film 17 is disposed on the diffuser plate 16 facing away from the light guide plate 18.

The light guide plate 18 may be made of acrylic or polycarbonate PC plate, or may be made of other transparent materials with high refractive index and low absorption rate, which is not limited herein.

The light guide plate 18 is applied to the principle of using the total reflection property of light, and when light emitted from a light source is incident into the light guide plate at a set angle, the light is totally reflected when incident on the surface of the light guide plate due to the high refractive index of the light guide plate, so that the light emitted from the light source can be transmitted from one side of the light guide plate to the other side of the light guide plate, and the line light source is converted into a surface light source to provide backlight for the display panel.

The bottom surface of the light guide plate 18 may be formed with light guide dots by laser engraving, V-shaped cross grid engraving, or UV screen printing. When the light rays irradiate each light guide point, the reflected light rays are diffused towards each angle, and when a part of the light rays irradiate the upper surface of the light guide plate, the total reflection condition is not met any more, so that the light rays can be emitted from the front surface of the light guide plate. Through setting up density, the leaded light point of variation in size can make the even light-emitting of light guide plate.

The form and function of the reflective sheet 15, the diffuser plate 16, and the optical film 17 are the same as those described above, and will not be described again.

Fig. 14-16 are schematic diagrams illustrating connection between a first light source and a second light source according to an embodiment of the present invention.

Referring to fig. 14-16, the first light source 11 and the second light source 12 are both located on the light incident side of the light guide plate 18 and are aligned in a straight line along the light incident surface of the light guide plate 18.

Referring to fig. 14, the light guide plate 18 includes a light incident surface (181); the first light sources 11 and the second light sources 12 are alternately arranged in a straight line along the light incident surface (181) of the light guide plate. The first light source 11 and the second light source 12 may form a light bar. The first light sources 11 are connected in series, the second light sources 12 are connected in series, and the series strings formed by the two light sources can be driven respectively. Alternatively, the light sources located in the same kind may be driven in a plurality of serial-parallel lines, and the driving is not limited herein.

Referring to fig. 15, the light guide plate 18 may include two oppositely disposed first and second light incident surfaces 181 and 182; the first light sources 11 are arranged in a straight line along the first light incident surface 181; the second light sources 12 are arranged in a straight line along the second light incident surface 182.

The first light source 11 forms a light bar, and the second light source 12 forms a light bar; the first light sources 11 can be mutually connected in series and driven in a unified manner, or can form a plurality of series strings to be driven respectively; the second light sources 12 may be driven in series or may be driven by a plurality of series strings, which is not limited herein.

Referring to fig. 16, the light guide plate 18 may further include four phase light incident surfaces, wherein the first light incident surface 181 is disposed opposite to the second light incident surface 182, and the third light incident surface 183 is disposed opposite to the fourth light incident surface 184. The first light sources 11 are arranged in a straight line along the first light incident surface 181; the second light sources 12 are arranged in a straight line along the second incident surface 182; the second light sources 12 are arranged in a line along the third incident surface 183 and the second light sources 12 are arranged in a line along the fourth incident surface 184.

The first light source 11 located on the first light incident surface 181 forms a light bar, and the second light source 12 located on the second light incident surface 182 forms a light bar; the first light incident surface 181 and the second light incident surface 182 may be light incident surfaces corresponding to long sides of the light guide plate; the second light sources 12 located on the third light incident surface 183 form a light bar, and the second light sources 12 located on the fourth light incident surface 184 form a light bar; the third light incident surface 183 and the fourth light incident surface 184 may be light incident surfaces corresponding to short sides of the light guide plate.

The first light sources 11 can be mutually connected in series and driven in a unified manner, or can form a plurality of series strings to be driven respectively; the second light sources 12 may be driven in series or may be driven by a plurality of series strings, which is not limited herein.

The backlight module with different structures provided by the embodiment of the invention integrates two light sources, when the display device is switched to a high color gamut display mode, the first light source 11 is driven to provide backlight, and when the display device is switched to an eye protection display mode, the second light source 12 is driven to provide backlight, so that the switching between the high color gamut display mode and the eye protection display mode is realized, and two display requirements are met in one display device.

According to a first inventive concept, a backlight module includes: a first light source for providing a backlight in a first display mode; a second light source for providing backlight in a second display mode; the first display mode is different from the second display mode, thereby adapting the display device to different display requirements.

According to the second inventive concept, the first display mode is a high color gamut display mode, the second display mode is an eye protection display mode, two light sources are integrated in the backlight module, when the display device is switched to the high color gamut display mode, the first light source is driven to provide backlight, and when the display device is switched to the eye protection display mode, the second light source is driven to provide backlight, so that the switching between the high color gamut display mode and the eye protection display mode is achieved, and two display requirements are met in one display device.

According to the third inventive concept, the light energy of the wavelength 415nm to 455nm in the spectrum of the first light source has a different proportion of light energy of the wavelength 400nm to 500nm from the light energy of the wavelength 415nm to 455nm in the spectrum of the second light source. Two kinds of light sources are integrated in the backlight module, and blue light energy is adjusted respectively for a high color gamut display mode and an eye protection display mode so as to meet different display requirements.

According to the fourth inventive concept, the spectrum of the first light source meets the requirement that the DCI-P3 color gamut standard is greater than or equal to 90%; the spectrum of the second light source meets the requirement that the light energy with the wavelength of 415nm-455nm accounts for less than 50% of the light energy with the wavelength of 400nm-500 nm. Therefore, when the first light source is adopted to provide backlight, the display device can display images with high color gamut, and when the second light source is adopted to provide backlight, emergent light of the display device can meet the eye protection requirement.

According to the fifth inventive concept, the first light source and the second light source both use white LEDs, and the peak wavelengths of the light emitting chips included in the first light source and the second light source are all different, so that the two light sources can provide backlight in different display modes, so that the display device can be switched between a high color gamut display mode and an eye protection display mode.

According to the sixth inventive concept, at least two light emitting chips are packaged in the same packaging support, so that the times of surface mounting can be reduced, and the production and processing are facilitated.

According to the seventh inventive concept, two identical light emitting chips can be packaged in the same packaging bracket, and are connected in series, and the LED can be driven simultaneously after being mounted on the circuit board.

According to the eighth inventive concept, two identical light emitting chips are packaged in the same packaging bracket, and are connected in parallel, and the LED can be driven simultaneously after being mounted on the circuit board.

According to the ninth inventive concept, two kinds of light emitting chips of different kinds are packaged in the same packaging support, different light emitting chips are respectively connected with different electrodes, and after the LED is mounted on the circuit board, the two kinds of light emitting chips can be respectively driven according to a circuit designed by the circuit board.

According to the tenth inventive concept, the first light source is a white light LED, and includes a first light emitting chip, the first light emitting chip is a blue light emitting chip, an emission wavelength of the first light emitting chip is 450nm to 455nm, and the phosphor on the light emitting side of the first light emitting chip is Yttrium Aluminum Garnet (YAG) phosphor or fluoride phosphor.

According to the eleventh inventive concept, the second light source includes a second light emitting chip, the second light emitting chip is a blue light emitting chip, an emission wavelength of the second light emitting chip is 457.5nm to 462.5nm, and the phosphor on the light emitting side of the second light emitting chip is Yttrium Aluminum Garnet (YAG) phosphor or fluoride phosphor.

According to the twelfth inventive concept, the second light source includes a second light emitting chip, the second light emitting chip is a blue light emitting chip, the emission wavelength of the second light emitting chip is 410nm to 415nm, and the phosphor on the light emitting side of the second light emitting chip is a mixture of blue phosphor, green phosphor, red phosphor, and yellow phosphor.

According to the thirteenth inventive concept, the backlight module is a direct type backlight module, and the first light sources and the second light sources are arranged in an array along a first direction (e.g., a horizontal direction) and a second direction (e.g., a vertical direction) that are mutually crossed, so that the overall brightness of the backlight module can be improved, and the light sources are more uniform.

According to the fourteenth inventive concept, the first light sources are arranged in a plurality of lines in the first direction, the second light sources are arranged in a plurality of lines in the first direction, and the lines in which the first light sources are arranged and the lines in which the second light sources are arranged are alternately arranged in the second direction. The first light source and the second light source can adopt a single packaging mode, or two different light emitting chips can be packaged in the same packaging support.

According to the fifteenth inventive concept, the first light sources and the second light sources are alternately arranged in the first direction and the second direction, which can make the light sources more uniformly distributed. The first light source and the second light source can adopt an independent packaging mode, the first light sources in the same row are connected in series, the second light sources in the same row are connected in series, and series strings formed by the two light sources can be respectively driven. Alternatively, the same light source located in the same row may be driven by a plurality of series-parallel lines.

According to the sixteenth inventive concept, the backlight module is a side-in type backlight module, and the first light source and the second light source are located at the light-in side of the light guide plate. The whole thickness of the backlight module is smaller, and the backlight module is favorable for being applied to an ultrathin display device.

According to the seventeenth inventive concept, the light guide plate includes a light incident surface; the first light sources 11 and the second light sources are alternately arranged in a straight line along the light incident surface of the light guide plate. The first light source and the second light source can form a light bar. The first light sources are connected in series, the second light sources are connected in series, and series strings formed by the two light sources can be driven respectively. Alternatively, a plurality of series-parallel line-time driving units may be provided in the same light source.

According to the eighteenth inventive concept, the light guide plate includes a first light incident surface and a second light incident surface which are oppositely disposed; the first light sources are arranged in a straight line along the first light incident surface; the second light is arranged in a straight line along the second light incident surface. The first light source forms a light bar, and the second light source forms a light bar; the first light sources can be mutually connected in series and driven in a unified way, and a plurality of series strings can be formed and driven respectively; the second light sources can be mutually connected in series and driven in a unified mode, and a plurality of series strings can be formed and driven respectively.

According to the nineteenth inventive concept, the light guide plate includes four phase light incident surfaces, wherein the first light incident surface and the second light incident surface are disposed opposite to each other, and the third light incident surface and the fourth light incident surface are disposed opposite to each other. The first light sources are arranged in a straight line along the first light incident surface; the second light is arranged in a straight line along the second light incident surface; the second light sources are arranged in a straight line along the third light incident surface, and the second light sources are arranged in a straight line along the fourth light incident surface. The first light source located on the first light incident surface forms a light bar, and the second light sources located on the second light incident surface, the third light incident surface and the fourth light incident surface form three light bars. The first light sources can be mutually connected in series and driven in a unified manner, and a plurality of series strings can be formed and driven respectively; the second light sources can be mutually connected in series and driven in a unified mode, and a plurality of series strings can be formed and driven respectively.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A display device, comprising:

a display panel for image display;

the backlight module is positioned at the light incidence side of the display panel and used for providing backlight;

the backlight module includes:

a first light source for providing a backlight in a first display mode;

a second light source for providing backlight in a second display mode;

wherein the first display mode is different from the second display mode.

2. The display device according to claim 1, wherein a proportion of light energy having a wavelength of 415nm to 455nm in the spectrum of the first light source in light energy having a wavelength of 400nm to 500nm is larger than a proportion of light energy having a wavelength of 415nm to 455nm in light energy having a wavelength of 400nm to 500nm in the spectrum of the second light source.

3. The display device of claim 2, wherein the spectrum of the first light source meets the DCI-P3 color gamut standard of greater than or equal to 90%; the spectrum of the second light source satisfies that the proportion of light energy with the wavelength of 415nm-455nm in light energy with the wavelength of 400nm-500nm is less than 50%.

4. The display device of claim 2, wherein the first light source and the second light source are both light emitting diodes; the light emitting diode includes:

the light emitting chip is used for emitting exciting light with set wavelength;

the fluorescent powder is positioned on the light emitting side of the light emitting chip and used for generating light with other wavelengths under the excitation of the exciting light;

the packaging support is used for packaging the light-emitting chip and the fluorescent powder;

the light-emitting chip is packaged in the packaging support; or at least two of the light-emitting chips are packaged in one packaging support, and the light-emitting chips in one packaging support are light-emitting chips of the same light source or light-emitting chips of different light sources.

5. The display device according to claim 4, wherein the first light source includes a first light emitting chip; the emergent wavelength of the first luminescent chip is 450nm-455nm, and the fluorescent powder positioned at the light emergent side of the first luminescent chip is yttrium aluminum garnet fluorescent powder or fluoride fluorescent powder;

the second light source comprises a second light emitting chip; the emergent wavelength of the second light-emitting chip is 457.5nm-462.5nm, and the fluorescent powder positioned at the light-emitting side of the second light-emitting chip is yttrium aluminum garnet fluorescent powder or fluoride fluorescent powder; or the emergent wavelength of the second light-emitting chip is 410nm-415nm, and the fluorescent powder positioned at the light-emitting side of the second light-emitting chip is a mixture of blue fluorescent powder, green fluorescent powder, red fluorescent powder and yellow fluorescent powder.

6. The display device according to any one of claims 1 to 5, wherein the backlight module further comprises:

a light guide plate for guiding light; the first light source and the second light source are located on the light incident side of the light guide plate.

7. The display device according to claim 6, wherein the light guide plate includes a light incident surface; the first light sources and the second light sources are alternately arranged in a straight line along the light incident surface of the light guide plate.

8. The display device according to claim 6, wherein the light guide plate comprises at least a first light incident surface and a second light incident surface which are oppositely arranged;

the first light sources are arranged along the first light incident surface to form a straight line; the second light sources are arranged in a straight line along the second light incident surface.

9. The display device according to claim 8, wherein the light guide plate further comprises a third light incident surface and a fourth light incident surface which are oppositely arranged;

the second light sources are arranged in a straight line along the third light incident surface and the fourth light incident surface respectively.

10. The display device according to any one of claims 1 to 5, wherein the first light source and the second light source are arranged in an array along a first direction and a second direction that intersect each other;

the first light sources and the second light sources are alternately arranged along the first direction and alternately arranged along the second direction;

or, the first light sources are arranged in a plurality of straight lines along the first direction, the second light sources are arranged in a plurality of straight lines along the first direction, and the straight lines in which the first light sources are arranged and the straight lines in which the second light sources are arranged are alternately arranged along the second direction.