CN115407550B - Display device - Google Patents

Display device Download PDF

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Publication number
CN115407550B
CN115407550B CN202110592920.7A CN202110592920A CN115407550B CN 115407550 B CN115407550 B CN 115407550B CN 202110592920 A CN202110592920 A CN 202110592920A CN 115407550 B CN115407550 B CN 115407550B
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CN
China
Prior art keywords
light
display device
transparent substrate
light source
functional membrane
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Active
Application number
CN202110592920.7A
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Chinese (zh)
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CN115407550A (en
Inventor
李富琳
宗志豪
张楠楠
刘晓杰
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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Priority to CN202110592920.7A priority Critical patent/CN115407550B/en
Publication of CN115407550A publication Critical patent/CN115407550A/en
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers

Abstract

The invention discloses a display device, comprising: a display panel and a backlight module; the backlight module comprises: back plate, lamp panel and functional membrane; the lamp plate includes: the light source comprises a transparent substrate and a reflecting layer, part of light rays emitted by the light source are reflected back to one side of the lamp panel by the functional membrane, the reflected light rays penetrate through the transparent substrate to reach the reflecting layer at the bottom of the transparent substrate, the light rays are reflected upwards by the reflecting layer, and the light rays penetrate through the transparent substrate again to finally reach the functional membrane. Thus, the propagation path of light is extended by the thickness of the transparent substrate, and the irradiation range of the single light source is increased. The invention can properly reduce the distance from the light source to the lower surface of the diffusion plate on the premise of not changing the number of the light sources, thereby meeting the development requirement of thinning the display device on the premise of not increasing the manufacturing cost.

Description

Display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
With the rapid progress of the manufacturing technology of the liquid crystal display (liquid crystal display, abbreviated as LCD), the liquid crystal display has the advantages of light weight, low power consumption, no radiation, etc., so that the liquid crystal display is widely applied to various electronic products such as notebook computers, digital cameras, digital video cameras, mobile phones, computer screens, liquid crystal televisions, etc.
The backlight module is used as one of key components of the liquid crystal display panel to provide a light source with sufficient brightness and uniform distribution for the liquid crystal display panel, so that the liquid crystal display panel can normally display images. The backlight module commonly used at present comprises a side-in backlight module and a direct-down backlight module, in the direct-down backlight module, in order to ensure the uniformity of the brightness of a display screen, a certain light mixing distance needs to be set between a light source and a diffusion plate, however, along with the development requirement of thinning of a display device, when the light mixing distance is reduced by 1/n, in order to ensure the display effect of the display device, the particle number of a light emitting light source needs to be increased to n 2 The manufacturing cost of the display device is greatly increased.
Disclosure of Invention
In some embodiments of the present invention, a display device includes: a display panel and a backlight module; the backlight module comprises: back plate, lamp panel and functional membrane; the lamp plate includes: the light source comprises a transparent substrate and a reflecting layer, part of light rays emitted by the light source are reflected back to one side of the lamp panel by the functional membrane, the reflected light rays penetrate through the transparent substrate to reach the reflecting layer at the bottom of the transparent substrate, the light rays are reflected upwards by the reflecting layer, and the light rays penetrate through the transparent substrate again to finally reach the functional membrane. Thus, the propagation path of light is extended by the thickness of the transparent substrate, and the irradiation range of the single light source is increased. The invention can properly reduce the distance from the light source to the lower surface of the diffusion plate on the premise of not changing the number of the light sources, thereby meeting the development requirement of thinning the display device on the premise of not increasing the manufacturing cost.
In some embodiments of the present invention, the lamp panel further includes: the circuit layer and the light source, wherein, the light source can be contacted with the functional membrane, thereby realizing the design that the light mixing distance is zero and reducing the thickness of the display device to the greatest extent.
In some embodiments of the invention, the functional membrane is an angle selective membrane; the angle selection film can enhance reflection of light rays ranging from 0 degrees to 70 degrees and simultaneously enhance reflection of light rays ranging from 70 degrees to 90 degrees. Wherein, the range of 0-70 degrees refers to the light rays with small angles emitted by the light source, the range of 70-90 degrees refers to the light rays with large angles emitted by the light source, so that the light rays with small angles emitted by the light source can be reflected back to the direction of the lamp panel, and the light rays with large angles emitted by the light source can be reflected back and emitted; the light rays with small angles reflected back to the direction of the lamp panel pass through the transparent substrate, reach the reflecting layer at the bottom of the transparent substrate, and then form a part of light rays with large angles after being scattered or diffusely reflected by the reflecting layer, so that the light rays with small angles are reflected and emitted by the angle selection film, the emergent intensity of the light rays with small angles close to the emergent center is reduced, the emergent intensity of the light rays with large angles far away from the emergent center is increased, the final emergent illuminance is consistent, and the uniformity of the emergent light of the light source is improved.
In some embodiments of the present invention, the angular selection film has a transmittance of 20% -90% for light rays ranging from 0 ° -70 °, and a reflectance of less than 10% for light rays ranging from 70 ° -90 °.
In some embodiments of the present invention, the functional membrane may be a reflective polarizer, which may transmit all the P light and reflect all the S light; the S light reflected by the reflective polarizer back to one side of the lamp panel passes through the transparent substrate, reaches the reflective layer at the bottom of the transparent substrate, the light totally reflected by the reflective layer comprises P light and S light, passes through the transparent substrate again, reaches the reflective polarizer, transmits the P light in the light, and reflects the S light back to one side of the lamp panel again. The method and the device have the advantages that the irradiation range of a single light source is widened, the distance from the light source to the lower surface of the diffusion plate can be shortened on the premise of not changing the number of the light sources, and therefore the development requirement of thinning of the display device can be met on the premise of not increasing the manufacturing cost.
In some embodiments of the present invention, the reflective layer is coated on the surface of the transparent substrate facing the back plate by using a material with reflective property, wherein the material can be white ink with the property of reflecting light, and the reflectivity of the white ink is greater than or equal to 85%.
In some embodiments of the present invention, the reflective layer includes a substrate and a reflective layer, and the reflective layer may be formed by spraying the substrate with a mixture having a high reflectivity.
In some embodiments of the present invention, the transparent substrate is made of glass with high thermal conductivity, and the substrate is made of glass with high thermal conductivity, so that heat emitted by the display device during display can be rapidly emitted, and the problem of reduced luminous efficiency caused by excessive temperature is avoided; in addition, compared with the traditional aluminum substrate, FR-4 and other materials, the glass substrate has smaller expansion and contraction rate, high flatness and difficult deformation, can realize large-scale die bonding and workpiece forming, and the whole machine can be spliced in a large size and a small quantity, has high workpiece forming yield and can be matched with a small-size light source better.
In some embodiments of the present invention, the backlight module further includes a diffusion sheet and a diffusion plate support, and the diffusion plate is provided with a scattering particle material, and light incident on the scattering particle material is continuously refracted and reflected, so as to achieve the effect of scattering the light, and achieve the effect of light homogenization; the diffusion plate support is used for supporting the functional membrane and the diffusion plate, so that the flatness of the functional membrane and the diffusion plate can be further guaranteed, and collapse, warping and deformation of the functional membrane and the diffusion plate are prevented.
In some embodiments of the present invention, the light source may be a packaged micro light emitting diode, which is different from a common light emitting diode, and specifically refers to a micro light emitting diode chip. The miniature light-emitting diode has small size, so that the dynamic light emission of the backlight module is controlled to be smaller in area, and the contrast ratio of pictures is improved. The micro light emitting diode may take various sizes, for example, the micro light emitting diode has a size less than 500 μm.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional structure of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial cross-sectional structure of a backlight module in the prior art;
FIG. 3 is a schematic diagram of a partial cross-sectional structure of a backlight module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a partial cross-sectional structure of a backlight module according to an embodiment of the invention;
FIG. 5 is a schematic diagram of the operation of an angle selective membrane according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a partial cross-sectional structure of a backlight module according to an embodiment of the invention.
The backlight module comprises a 100-backlight module, a 200-display panel, a 11-back plate, a 12-lamp panel, a 13-functional membrane, a 14-diffusion plate, a 15-optical membrane, a 16-diffusion plate support, a 121-transparent substrate, a 122-circuit layer, a 123-light source, a 124-reflecting layer, a 1241-substrate and a 1242-reflecting layer.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The LCD is mainly composed of a backlight module and an LCD panel. The liquid crystal display panel does not emit light and needs to realize brightness display by means of a light source provided by the backlight module.
The display principle of LCD is to put liquid crystal between two pieces of conductive glass, and drive the electric field between two electrodes to cause the electric field effect of liquid crystal molecule distortion to control the transmission or shielding function of backlight source, so as to display the image. If a color filter is added, a color image can be displayed.
Fig. 1 is a schematic cross-sectional structure of a display device according to an embodiment of the present invention.
Referring to fig. 1, the display device includes: a backlight module 100 and a display panel 200.
The display panel 200 is located on 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, and in general, the display panel 200 may be configured as a rectangle 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 side of the left side and one side of the right side respectively, and the bottom side is connected to the other side of the left side and the other side of the right side respectively.
The display panel 200 is a transmissive display panel, and is capable of modulating the transmittance of light, but does not emit light 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 the light incident on the pixel unit by the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
The backlight module 100 is generally located at the bottom of the display device, and its shape and size are adapted to those of the display device. When applied to the fields of televisions, mobile terminals and the like, the backlight module generally adopts a rectangular shape.
Fig. 2 is a schematic diagram of a partial cross-sectional structure of a backlight module in the prior art.
As shown in fig. 2, in the prior art, in order to ensure uniformity of brightness of a display screen, a certain light mixing distance H (distance from the light source 123 to the lower surface of the diffusion plate 14) needs to be set between the light source 123 and the diffusion plate 14, however, as the display device is required to be thinned, when the light mixing distance is reduced by 1/n, the particle number of the light emitting source 123 needs to be increased to n in order to ensure display effect of the display device 2 The manufacturing cost of the display device is greatly increased.
In view of the above, the embodiments of the present invention provide a display device, which meets the development requirement of thinning the display device without increasing the manufacturing cost.
Fig. 3 is a schematic diagram of a partial cross-sectional structure of a backlight module according to an embodiment of the invention.
Referring to fig. 3, the backlight module includes: a back plate 11, a lamp panel 12, a functional membrane 13, a diffusion plate 14 and an optical membrane 15.
The back plate 11 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 11 is typically a rectangular structure, the shape of which is adapted to the shape of the display device when applied to a shaped display device. The back plate 11 includes a top side, a bottom side, a left side, and a right side. Wherein the sky side is relative with the earth side, and left side is relative with the right side, and the sky side links to each other with one end of left side and one side of right side respectively, and the earth side links to each other with the other end of left side and the other end of right side respectively.
The back plate 11 is made of aluminum, iron, aluminum alloy or iron alloy. The back plate 11 is used for supporting the lamp plate 12, and supporting and fixing the edge positions of the functional membrane 13, the diffusion plate 14, the optical membrane 15 and other parts, and the back plate 11 also plays a role in heat dissipation of the lamp plate 12.
In the embodiment of the invention, the backlight module is a direct type backlight module, and the lamp panel 12 is located on the back plate 11. Generally, the lamp panel 12 may have a square or rectangular shape as a whole, and the shape and size of the lamp panel are adapted to the shape and size of the display device when the lamp panel is applied to the special-shaped display device.
A plurality of light panels 12 may be provided according to the size of the display device, and backlight is commonly provided between the light panels 12 by a stitching manner. In order to avoid the optical problem caused by the splicing of the lamp panels 12, the splice between the adjacent lamp panels 12 is made as small as possible, and even seamless splicing is realized.
Referring to fig. 3, the lamp panel 12 specifically includes: a transparent substrate 121, a wiring layer 122, a light source 123, and a light reflecting layer 124.
The transparent substrate 121 is located above the back-plate 11, and the shape of the transparent substrate 121 is the same as the overall shape of the lamp panel 12. In general, the substrate 121 has a plate shape, and is rectangular or square overall.
In the embodiment of the invention, the transparent substrate 121 is made of glass with high thermal conductivity, and the substrate 121 is made of glass with high thermal conductivity, so that heat emitted by the display device during display can be rapidly emitted, and the problem of reducing luminous efficiency caused by overhigh temperature is avoided; in addition, compared with the traditional aluminum substrate, FR-4 and other materials, the glass substrate has smaller expansion and contraction rate, high flatness and difficult deformation, can realize large-scale die bonding and workpiece forming, and the whole machine can be spliced in a large size and less, has high workpiece forming yield and can be matched with the small-size light source 123 better.
The circuit layer 122 provided in the embodiment of the present invention is formed by electroplating and depositing a conductive material on the transparent substrate 121, and etching the circuit according to the need, where the conductive material may be copper, and is not limited herein. The conductive material may etch a break, and both sides of the break are respectively connected to the positive electrode and the negative electrode of the light source 123.
When the circuit layer 122 is manufactured by the etching process, the transparent substrate 121 and the circuit layer 122 may constitute a circuit board; alternatively, when the wiring layer 122 is fabricated by a thin film process, the transparent substrate 121 and the wiring layer 122 may also constitute an array substrate, which is not limited herein.
The light source 123 is located above the circuit layer 122, and after the circuit layer 122 is manufactured, a bonding pad for bonding the light source 123 is formed on the surface of the circuit layer 122, and the light source 123 is bonded on the bonding pad, so that the light source 123 is driven to emit light by a driving signal of the control circuit layer 122.
In the embodiment provided in the present invention, the light source 123 may be a packaged micro light emitting diode, which is different from a common light emitting diode, and specifically refers to a micro light emitting diode chip. The miniature light-emitting diode has small size, so that the dynamic light emission of the backlight module is controlled to be smaller in area, and the contrast ratio of pictures is improved. In embodiments of the present invention, the micro light emitting diode may take a variety of sizes, for example, the micro light emitting diode is less than 500 μm in size. The micro light emitting diode can be manufactured in a corresponding size according to practical application, and is not limited herein.
The light panel 12 may include only micro light emitting diodes of one color, or may include micro light emitting diodes of multiple colors, which is not limited herein.
The miniature light-emitting diode can be packaged in a POB mode and a COB mode, and when the miniature light-emitting diode is packaged in the POB mode, a packaging support is arranged on the outer side of the miniature light-emitting diode and used for packaging and protecting the miniature light-emitting diode, and foreign matters are prevented from entering the miniature light-emitting diode. In the embodiment of the invention, when the micro light emitting diode is packaged in the POB packaging mode, the lower surface of the micro light emitting diode is formed with a patch electrode at the same time, the patch electrode is correspondingly and electrically connected with the electrode of the micro light emitting diode, and the packaged micro light emitting diode is then patched to the corresponding position of the circuit layer 122 after the packaging. The POB packaging mode has mature process and good adaptability.
In some embodiments of the present invention, the COB packaging method is used to package the micro light emitting diode, then the micro light emitting diode is welded to the pad corresponding to the circuit layer 122, and then the micro light emitting diode is packaged by dispensing or coating the whole layer on the surface of the micro light emitting diode, where the packaging glue on the surface of the micro light emitting diode may be made of transparent glue material, such as silica gel, modified silica gel or epoxy resin with better permeability. COB packages have high efficiency and low cost.
The reflective layer 124 is located on a side of the transparent substrate 121 facing the back plate 11, and has the same shape as the overall shape of the lamp panel 12, and the reflective layer 122 has a property of reflecting light.
In the embodiment of the present invention, the reflective layer 124 is coated on the surface of the transparent substrate 121 facing the back plate 11 with a material having a reflective property, and the material may be a white ink having a property of reflecting light, and the reflectivity of the white ink is greater than or equal to 85%, which is not limited herein.
In other embodiments of the present invention, as shown in FIG. 4, the retroreflective layer 124 includes a substrate 1241 and a retroreflective layer 1242.
The substrate 1241 is located on a side of the transparent substrate 121 facing the back plate 11, and has the same shape as the overall shape of the light reflecting layer 124. In the embodiment provided in the present invention, the material used for the substrate 1241 is PET, and other materials may be used according to the specific requirements of the display device, which is not limited herein.
The reflective layer 1242 is located on a surface of the substrate 1241 near the transparent substrate 121, and has the same shape as the overall shape of the reflective layer 124. In the embodiment provided in the present invention, the reflective layer 1242 may be formed by spraying the substrate 1241 with a high-reflectivity compound, which is not limited herein, depending on the specific requirements of the display device.
In the embodiment of the present invention, the reflective layer 124 formed by the substrate 1241 and the reflective layer 1242 may be a diffuse reflective layer, and the diffuse reflective layer may make the reflection path of the reflected light random, so as to play a role in homogenizing the light.
The functional film 13 is located on the light emitting side of the lamp panel 12, and has the same shape as the overall shape of the lamp panel 12, and in the embodiment of the present invention, the functional film 13 has a function of reflecting part of the incident light.
Meanwhile, in the embodiment of the present invention, the light panel 12 can transmit light except for the positions where the light source 123 and the circuit layer 122 are disposed, the light reflected by the functional film 13 can pass through the transparent substrate 121 to reach the reflective layer 124 through the gap of the circuit layer 122, and similarly, the light reflected by the reflective layer 124 can pass through the transparent substrate 121 and exit to the functional film 13 through the gap of the circuit layer 122.
In the embodiment provided by the invention, as shown in fig. 3, part of the light emitted by the light source 123 is reflected back to one side of the lamp panel 12 by the functional film 13, the reflected light passes through the transparent substrate 121 and reaches the reflective layer 124 at the bottom of the transparent substrate 121, the reflective layer 124 reflects the light upwards again, and the light passes through the transparent substrate 121 again and finally reaches the functional film 13. Thus, the embodiment of the present invention extends the propagation path of the light by using the thickness of the transparent substrate 121, so that the irradiation range of the single light source 123 is increased from D1 to D2. On the basis, the distance from the light source 123 to the lower surface of the diffusion plate 14 (the light mixing distance H in fig. 2) can be properly reduced without changing the number of the light sources 123, so that the embodiment of the invention can meet the development requirement of thinning the display device without increasing the manufacturing cost.
Further, in the embodiment provided by the invention, the light source 123 may be in contact with the functional film 13, so as to realize the design that the light mixing distance is zero, and reduce the thickness of the display device to the greatest extent.
The diffusion plate 14 is located at the light emitting side of the light source 123, and the shape of the diffusion plate 14 is the same as the overall shape of the lamp panel 12. The diffuser plate 14 may be generally rectangular or square in configuration.
The diffuser plate 14 is used to scatter incident light so that the light passing through the diffuser plate 14 is more uniform. The diffusion plate 14 is provided with a scattering particle material, and light rays are incident on the scattering particle material and are continuously refracted and reflected, so that the effect of scattering the light rays is achieved, and the effect of homogenizing the light is achieved.
The diffusion plate 14 has high haze and better uniformity, and can be processed by adopting an extrusion process, and the material used in the diffusion plate 14 is generally at least one selected from polymethyl methacrylate PMMA, polycarbonate PC, polystyrene material PS and polypropylene PP.
When the light source 123 of the lamp panel 12 emits blue light only, a quantum dot material can be further arranged in the diffusion plate 14 to form a quantum dot diffusion plate, the quantum dot material comprises a red quantum dot material and a green quantum dot material, and the red quantum dot material emits red light with the wavelength of about 620nm-640nm under the excitation of the blue light; the green quantum dot material emits green light with the wavelength of about 520nm-540nm under the excitation of blue light, and the excited red light, the green light and the transmitted blue light are mixed into white light for emitting.
The quantum dot diffusion plate is not provided with a quantum dot film in the subsequent process of manufacturing the backlight module, so that the cost is reduced, and the display device is lighter and thinner.
The optical film 15 is located on a side of the diffusion plate 14 away from the lamp panel 12, and the optical film 15 is integrally formed and has the same shape as the overall shape of the diffusion plate 14, and may be generally rectangular or square.
The optical film 15 can adapt the backlight module to various practical applications.
In an embodiment of the present invention, the light source 123 may be a blue light device, and the optical film 15 includes a quantum dot layer or a fluorescent layer.
The quantum dot layer comprises a red quantum dot material and a green quantum dot material, the red quantum dot material emits red light under the excitation of blue light, the green quantum dot material emits green light under the excitation of blue light, and the excited red light, the excited green light and the transmitted blue light are mixed into white light for emitting.
The fluorescent layer comprises a fluorescent material for stimulated emission of red light and stimulated emission of green light, and the stimulated emission of the red light, the green light and the transmitted blue light are mixed into white light for emission.
In addition, the optical film 15 may further include a prism sheet that can change an outgoing angle of light, thereby changing a viewable angle of the display device.
The optical film 15 may further include a reflective polarizer, which is used as a brightness enhancing sheet, so as to enhance the brightness of the backlight module, enhance the light utilization efficiency, and simultaneously make the outgoing light have polarization properties, so as to omit the use of the polarizer under the liquid crystal display panel.
Since the intensity distribution of the emitted light of the light source 123 is generally larger at the position close to the emission center, and smaller at the position far from the edge of the emission center, the brightness of the light source 123 at the position corresponding to the emission center is larger when the light source is irradiated on a certain plane, and smaller at the position corresponding to the position far from the emission center, so that the intensity distribution at the boundary between two adjacent light sources 123 in the backlight module is weaker, resulting in poor uniformity, that is, inconsistent illuminance at the emission plane. In order to make the illuminance of the light source on the light-emitting surface uniform, the light intensity near the light-emitting center of the light source needs to be reduced, and the light intensity at the edge needs to be increased. The reflected light passes through the transparent substrate 121, reaches the reflective layer 124 at the bottom of the transparent substrate 121, and the reflective layer 124 reflects the light upward again, and the light passes through the transparent substrate 121 again, and finally reaches the functional membrane 13.
In view of this, in the embodiments provided by the present invention, the functional membrane 13 may be an angle selective membrane that may be reflective to light in the range of 0 ° -70 ° while being reflective to light in the range of 70 ° -90 °. Wherein, the range of 0-70 degrees refers to the light rays with small angles emitted by the light source 123, the range of 70-90 degrees refers to the light rays with large angles emitted by the light source 123, so that the light rays with small angles emitted by the light source are reflected back to the direction of the lamp panel 12, and the light rays with large angles emitted by the light source are reflected back and emitted; the light with small angle reflected back to the direction of the lamp panel 12 passes through the transparent substrate 121, reaches the reflective layer 124 at the bottom of the transparent substrate 121, and forms a part of light with large angle after being scattered or diffusely reflected by the reflective layer 124, so that the light is reflected and emitted by the angle selection film, thereby reducing the emergent intensity of the light with small angle near the emergent center, increasing the emergent intensity of the light with large angle far away from the emergent center, enabling the final emergent illuminance to be consistent, and improving the uniformity of the emergent light of the light source.
The thickness of the angle selection film provided by the embodiment of the invention is 30-60 μm, and because the thickness of the angle selection film is thinner, in the embodiment provided by the invention, the angle selection film is formed on the surface of the diffusion plate 14 facing the side of the lamp panel 12, so that the flatness of the angle selection film is ensured, and the optical effect of the angle selection film is ensured.
The angle selection film provided by the embodiment of the invention can enhance reflection or enhance reflection of light rays with specific incidence angles by utilizing the thin film interference principle, and the enhancement reflection or enhancement reflection effect of the light rays depends on the incidence angle of the light rays to the film layer, the refractive index of the film layer and the thickness of the film layer, so that two film layers with equal refractive indexes are prevented from being adjacently arranged in order not to influence the calculation of the thickness of the film layer. And the single-layer film layer has limited reflection-increasing or reflection-increasing effect on incident light, and when the method is implemented, a plurality of film layers can be adopted as a group, and the reflection-increasing or reflection-increasing effect of the angle selection sheet can be improved in a mode that a plurality of film layers are arranged.
The principle of reflecting light rays at a small angle and transmitting light rays at a large angle by the film layer in the angle selection film will be specifically described below.
As shown in fig. 5, when a light ray is incident on the surface of a thin film with a refractive index n2 from a medium with a refractive index n1 at an incident angle i, reflection and refraction of the light occur at the interface between the n1 and n2, the reflection angle is equal to the incident angle, the refraction angle is gamma, and the reflection angle is still i; when the refracted ray is incident on the lower surface of the film, reflection and refraction of light occur on the lower surface, wherein the reflected ray is refracted into the n1 medium through the upper surface of the film, thereby forming two reflected rays (1) and (2) on the upper surface and the lower surface of the film. The optical path difference delta' between the reflected light (1) and the reflected light (2) is:
when the film having a refractive index n2 has a thickness d and is a film having a uniform thickness, the film is formed byAnd is also provided withThus, it is possible to obtain:
from the law of refraction it is known that:
n 1 sin i＝n 2 sin r
thus, it is possible to obtain:
as can be seen from the above, if a multilayer film structure is provided, the optical path difference of the reflected light of the light on the upper limit surface of each layer of medium is only dependent on the refractive index, thickness and incident angle from the air layer of that layer (by the law of refraction n 1 sin i＝n 2 sin r is a constant value after the incident angle is determined).
Where n2 is the refractive index of a certain layer of medium and i is the angle of incidence from the air layer.
Reflection increasing
Anti-reflection
By utilizing the principle, the multilayer film structure is designed, and the reflection rate or the transmittance of the angles can be controlled by arranging the reflection enhancing or antireflection films with different layers aiming at different angles. The angle selection film provided by the embodiment of the invention can reflect a part of small-angle light rays which are originally irradiated at the position right above the light source 123 and then transfer the light rays to the position where the light source 123 is intersected with the light source 123, so that the uniformity of backlight brightness after the backlight module is thinned is realized.
The transmittance of the angle selection film provided by the embodiment of the invention to light rays of 0-70 degrees is 20-90%, and the reflectivity of the corresponding light rays of 70-90 degrees is less than 10%.
In another embodiment provided by the present invention, the functional film 13 may be a reflective polarizer, and the reflective polarizer may transmit all P light and reflect all S light (where P light refers to incident light having a polarization direction parallel to the incident plane and S light refers to incident light having a polarization direction perpendicular to the incident plane); the S light reflected by the reflective polarizer back to the lamp panel 12 passes through the transparent substrate 121, reaches the reflective layer 124 at the bottom of the transparent substrate 121, and the light totally reflected by the reflective layer 124 includes P light and S light, passes through the transparent substrate 121 again, reaches the reflective polarizer, and the P light in the light is transmitted, and the S light is reflected back to the lamp panel 12 again. By repeating the above steps, the irradiation range of the single light source 123 is enlarged, and the distance from the light source 123 to the lower surface of the diffusion plate 14, namely the light mixing distance H, can be reduced without changing the number of the light sources 123.
Fig. 6 is a schematic diagram of a partial cross-sectional structure of a backlight module according to an embodiment of the invention.
Referring to fig. 6, the display device further includes: a diffuser plate bracket 16.
In the embodiment of the present invention, the back plate 11 may support the edge portions of the functional membrane 13 and the diffusion plate 14, but since the functional membrane 13 and the diffusion plate 14 need to cover the area where all the lamp panels 12 are located, the size of the functional membrane 13 and the diffusion plate 14 is relatively large, in order to further ensure the flatness of the functional membrane 13 and the diffusion plate 14, and prevent the functional membrane 13 and the diffusion plate 14 from collapsing, buckling and deforming, so that the optical characteristics of the backlight module are deteriorated, the embodiment of the present invention may further include a diffusion plate support 16, where the diffusion plate support 16 is located between the lamp panels 12 and the functional membrane 13 and is used for supporting the functional membrane 13 and the diffusion plate 14; and, the diffusion plate supporter 16 is located at a spaced position between the adjacent two light sources 123; alternatively, the center of the quadrangle formed by four adjacent light sources 123 may be avoided from the light sources 123, so that the light sources 123 may smoothly emit light.
In the embodiment provided by the invention, when the display device is designed with the mixing distance of zero, the height of the diffusion plate support 16 is equal to the height of the light source 123.
The diffuser bracket 16 provided by the present invention is typically made of polycarbonate PC.
In particular, the diffuser bracket 16 may have a triangular shape, a trapezoidal shape, a tapered shape, or the like, which is not limited thereto.
According to the first inventive concept, part of light emitted from the light source is reflected back to one side of the lamp panel by the functional film, the reflected light passes through the transparent substrate, reaches the reflective layer at the bottom of the transparent substrate, the reflective layer reflects the light upwards again, and the light passes through the transparent substrate again, and finally reaches the functional film. Thus, the propagation path of the light is prolonged by the thickness of the transparent substrate, and the irradiation range of the single light source is increased from D1 to D2. On the basis, the distance from the light source to the lower surface of the diffusion plate can be properly reduced on the premise of not changing the number of the light sources, so that the development requirement of thinning of the display device can be met on the premise of not increasing the manufacturing cost.
According to the second inventive concept, the light source may be in contact with the functional film, thereby realizing a design in which the light mixing distance is zero, and maximally reducing the thickness of the display device.
According to the third invention conception, the transparent substrate is made of glass with high thermal conductivity, and the substrate is made of glass with high thermal conductivity, so that heat emitted by the display device during display can be rapidly emitted, and the problem of reduced luminous efficiency caused by overhigh temperature is avoided; in addition, compared with the traditional aluminum substrate, FR-4 and other materials, the glass substrate has smaller expansion and contraction rate, high flatness and difficult deformation, can realize large-scale die bonding and workpiece forming, and the whole machine can be spliced in a large size and a small quantity, has high workpiece forming yield and can be matched with a small-size light source better.
According to a fourth inventive concept, the angle selective film may be reflective to light in the range of 0 ° -70 ° while being reflective to light in the range of 70 ° -90 °. Wherein, the range of 0-70 degrees refers to the light rays with small angles emitted by the light source, the range of 70-90 degrees refers to the light rays with large angles emitted by the light source, so that the light rays with small angles emitted by the light source can be reflected back to the direction of the lamp panel, and the light rays with large angles emitted by the light source can be reflected back and emitted; the light rays with small angles reflected back to the direction of the lamp panel pass through the transparent substrate, reach the reflecting layer at the bottom of the transparent substrate, and then form a part of light rays with large angles after being scattered or diffusely reflected by the reflecting layer, so that the light rays with small angles are reflected and emitted by the angle selection film, the emergent intensity of the light rays with small angles close to the emergent center is reduced, the emergent intensity of the light rays with large angles far away from the emergent center is increased, the final emergent illuminance is consistent, and the uniformity of the emergent light of the light source is improved.
According to a fifth inventive concept, the angular selection film has a transmittance of 20% -90% for light rays of 0 ° -70 °, and a reflectance of less than 10% for light rays of corresponding 70 ° -90 °.
According to the sixth inventive concept, the functional film may be a reflective polarizer, and the reflective polarizer may transmit all P light and reflect all S light (where P light refers to incident light having a polarization direction parallel to the incident surface and S light refers to incident light having a polarization direction perpendicular to the incident surface); the S light reflected by the reflective polarizer back to one side of the lamp panel passes through the transparent substrate, reaches the reflective layer at the bottom of the transparent substrate, the light totally reflected by the reflective layer comprises P light and S light, passes through the transparent substrate again, reaches the reflective polarizer, transmits the P light in the light, and reflects the S light back to one side of the lamp panel again. The method and the device have the advantages that the irradiation range of a single light source is widened, the distance from the light source to the lower surface of the diffusion plate can be shortened on the premise of not changing the number of the light sources, and therefore the development requirement of thinning of the display device can be met on the premise of not increasing the manufacturing cost.
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. It is therefore intended that the following claims be interpreted as including the 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (9)

1. A display device, comprising:
a display panel for displaying an image;
the backlight module is positioned on the light incident side of the display panel and is used for providing backlight;
the backlight module comprises:
the backboard has supporting and bearing functions;
the lamp panel is positioned on one side of the backboard;
the functional membrane is positioned on the light emitting side of the lamp panel; the functional membrane has the function of reflecting part of incident light rays;
the lamp panel includes:
a transparent substrate positioned above the back plate;
the reflecting layer is positioned on one side of the transparent substrate facing the backboard;
wherein, the lamp plate still includes: the circuit layer is positioned at one side of the transparent substrate, which is away from the reflecting layer, and is used for providing driving signals; the light source is positioned on the circuit layer; the light source is in contact with the functional membrane; the light source is a miniature light emitting diode; and packaging the miniature light emitting diode by using two modes of POB and COB.
2. The display device of claim 1, wherein the functional membrane is an angle-selective membrane; the angle selection film is used for increasing the reflection of light rays with the incidence angle of 0-70 degrees and increasing the transmission of light rays with the incidence angle of 70-90 degrees.
3. The display device of claim 2, wherein the angular selection film has a transmittance of 20% to 90% for light rays ranging from 0 ° to 70 ° and a reflectance of less than 10% for light rays ranging from 70 ° to 90 °.
4. The display device of claim 1, wherein the functional film is a reflective polarizer.
5. The display device of any one of claims 1-4, wherein the reflective layer is a white ink.
6. The display device of any one of claims 1-4, wherein the light reflecting layer comprises:
a substrate positioned on a side adjacent to the back plate;
and the reflecting layer is positioned on the surface of one side of the base material, which is away from the back plate.
7. The display device according to any one of claims 1 to 4, wherein the transparent substrate is made of glass.
8. The display device of claim 1, wherein the backlight module further comprises:
the diffusion plate is positioned at one side of the functional membrane, which is away from the lamp panel;
the diffusion plate bracket is positioned between the functional membrane and the lamp panel and is used for supporting the diffusion plate and the functional membrane.
9. The display device of claim 1, wherein the micro light emitting diode is less than 500 μm in size.
CN202110592920.7A 2021-05-28 2021-05-28 Display device Active CN115407550B (en)

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