CN109143687B - Backlight module, liquid crystal display module and electronic equipment - Google Patents
Backlight module, liquid crystal display module and electronic equipment Download PDFInfo
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- CN109143687B CN109143687B CN201811162965.5A CN201811162965A CN109143687B CN 109143687 B CN109143687 B CN 109143687B CN 201811162965 A CN201811162965 A CN 201811162965A CN 109143687 B CN109143687 B CN 109143687B
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- 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
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- 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
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- 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
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- 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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
The invention discloses a backlight module, a liquid crystal display module and electronic equipment, wherein a prism light guide structure is arranged at the periphery of a backlight area, a fluorescent powder layer is arranged on the outer surface of the prism light guide structure, and the propagation direction of emergent light of an LED light-emitting element adjacent to the prism light guide structure can be changed through the prism light guide structure so as to reduce the incident angle of the emergent light relative to a fluorescent film, so that the light emitted to the periphery of the backlight module is incident into the fluorescent film or vertically incident into the fluorescent film at a smaller incident angle, thereby improving the light intensity irradiating the periphery of the fluorescent film and exciting more white light emitted from the periphery of the fluorescent film. The prism light guide structure can avoid the gathering of peripheral blue light through the scattering effect of the surface fluorescent powder particles, and the problem that the peripheral back light is blue-deflected is solved. The liquid crystal display module and the electronic equipment comprise the backlight module, so that the problem that the peripheral edge of the backlight is blue is solved, and the image display quality is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a backlight module, a liquid crystal display module and electronic equipment.
Background
With the continuous development of scientific technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present. The main component of the electronic device that implements the display function is the display panel. Currently, one display panel commonly used in electronic devices is a liquid crystal display panel. The liquid crystal display panel comprises a liquid crystal display module and a backlight module which are oppositely arranged, the backlight module does not emit light, and the backlight provided by the backlight module is used for displaying images.
High-Dynamic Range (HDR) images have higher color depth, wider Dynamic Range and stronger color expressive force, and the liquid crystal display panel in the HDR display mode has performance such as High contrast/highlight and the like remarkably superior to that of a conventional liquid crystal display panel, even can be compared with an OLED display panel, and becomes an important research and development direction in the liquid crystal display panel industry.
Currently, the lcd panel in HDR display mode generally employs a direct-type backlight module, which includes an LED array having a plurality of LED light emitting elements. The existing backlight module has the problem that the peripheral edge backlight is blue, and the image display quality is high.
Disclosure of Invention
In order to solve the above problems, the technical solution of the present invention provides a backlight module, a liquid crystal display panel and an electronic device, which solve the problem that the backlight module has a blue-biased peripheral edge backlight and improve the image display quality.
In order to achieve the above purpose, the invention provides the following technical scheme:
a backlight module, comprising:
a substrate;
the LED light-emitting elements are arranged on the first surface of the substrate and electrically connected with the substrate, and all the LED light-emitting elements define a backlight area;
the fluorescent film is arranged on the light emitting side of the LED light-emitting element and is opposite to the first surface of the substrate;
the prism light guide structure is arranged at the periphery of the backlight area, and a fluorescent powder layer is arranged on the outer surface of the prism light guide structure;
the prism light guide structure is used for changing the transmission direction of emergent light of the LED light-emitting element adjacent to the prism light guide structure.
Preferably, in the backlight module, the LED light emitting element emits blue light for exciting the fluorescent film to emit white light.
Preferably, in the backlight module, the phosphor layer includes red phosphor and/or green phosphor.
Preferably, in the backlight module, the plurality of LED light emitting elements are arranged in an array, and the prism light guide structure is disposed between two adjacent LED light emitting elements in the same row, and/or the prism light guide structure is disposed between two adjacent LED light emitting elements in the same column.
Preferably, in the backlight module, the height of the prism light guide structure is greater than the height of the LED light emitting element;
in a direction perpendicular to the substrate, the prismatic light guiding structure has a first end facing the substrate and a second end facing the phosphor film;
the first end abuts against the substrate, and/or the second end abuts against the fluorescent film.
Preferably, in the backlight module, a planarization adhesive layer is disposed on the surface of the substrate, and the LED light-emitting element and the prism light guide structure are at least partially located in the planarization adhesive layer.
Preferably, in the backlight module, the prism light guide structure is a triangular prism, and the triangular prism is used for changing the propagation direction of the light by refraction and/or total reflection.
Preferably, in the backlight module, when the prism light guide structure is a triangular prism, a section of the triangular prism perpendicular to the edge is an isosceles acute triangle;
the vertex angle of the isosceles acute triangle faces the substrate, and the bottom edge of the isosceles acute triangle faces the fluorescent film and is parallel to the fluorescent film.
Preferably, in the backlight module, when the prism light guide structure is a triangular prism, a section of the triangular prism perpendicular to the edge is an isosceles right triangle;
one right-angle side of the isosceles right triangle faces the fluorescent film and is parallel to the fluorescent film, and the other right-angle side of the isosceles right triangle is perpendicular to the first surface of the substrate.
Preferably, in the backlight module, the prism light guide structure is a condensing lens, and the condensing lens is used for condensing incident light rays in a direction perpendicular to the fluorescent film.
Preferably, in the backlight module, the condensing lens is a convex lens or a condensing element having a plurality of protruding structures.
The invention also provides a liquid crystal display module, which comprises:
the liquid crystal display panel and the backlight module are oppositely arranged;
the backlight module is any one of the backlight modules.
The invention also provides electronic equipment which comprises the liquid crystal display module.
As can be seen from the above description, in the backlight module provided in the technical solution of the present invention, the prism light guide structure is disposed at the periphery of the backlight area, the fluorescent powder layer is disposed on the outer surface of the prism light guide structure, and the propagation direction of the light emitted from the LED light emitting element adjacent to the prism light guide structure can be changed by the prism light guide structure, so as to reduce the incident angle of the emitted light with respect to the fluorescent film, so that the light emitted from the backlight module to the periphery is incident into the fluorescent film at a smaller incident angle or perpendicularly incident into the fluorescent film, thereby increasing the intensity of the light irradiating the periphery of the fluorescent film, and exciting more white light emitted from the periphery of the fluorescent film. And the surface of the prism light guide structure is provided with the fluorescent powder layer, and the gathering of peripheral blue light can be avoided through the scattering effect of fluorescent powder particles, so that the problem that peripheral edge backlight is blue-deflected in the backlight module can be solved, and the image display quality is improved. The liquid crystal display module and the electronic equipment provided by the technical scheme of the invention comprise the backlight module, so that the problem that the peripheral edge of the backlight is blue is solved, and the image display quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a layout top view of LED light emitting elements in a backlight module according to an embodiment of the present invention;
FIG. 2 is a cut-away view of FIG. 1 at P-P';
fig. 3 is a layout top view of LED light emitting elements in another backlight module according to an embodiment of the present invention;
FIG. 4 is a cut-away view of FIG. 3 at P-P';
fig. 5 is a schematic diagram illustrating a principle of adjusting an optical path of a prism light guide structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating an optical path adjustment principle of another prism light guide structure according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating an optical path adjustment principle of another prism light guiding structure according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating an optical path adjustment principle of another prism light-guiding structure according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a liquid crystal display module according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the conventional HDR lcd panel, the adopted direct-type backlight module generally adopts Mini LEDs with excellent blue light as light emitting elements. Because the cutting precision of the fluorescent films at the periphery (the peripheral edge) of the backlight module is different, the concentration of the fluorescent powder of the peripheral fluorescent film is different; on the other hand, the blue light intensity is higher in the place where the Mini LED gathers, the excitation energy is large, the edge blue light intensity is smaller, the excitation energy is small, and the problem that the peripheral edge backlight of the backlight module is blue-deviated is caused, so that the image display quality is high.
In order to solve the above problems, an embodiment of the present invention provides a backlight module, in which a prism light guide structure is disposed at a periphery of a backlight area, a phosphor layer is disposed on an outer surface of the prism light guide structure, and a problem of back light bluing around the periphery of the backlight module can be solved by adjusting a light propagation direction and scattering effect of the phosphor layer on the surface of the prism light guide structure, so as to improve image display quality.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 and fig. 2, fig. 1 is a plan view of a layout of LED light emitting elements in a backlight module according to an embodiment of the present invention, and fig. 2 is a sectional view of fig. 1 taken at P-P', the backlight module is used for a liquid crystal display module, and the backlight module includes: a substrate 11; the plurality of LED light emitting elements 12, the plurality of LED light emitting elements 12 are arranged in an array, and the plurality of LED light emitting elements 12 are disposed on the first surface 111 of the substrate 11 and electrically connected to the substrate 11; all of the LED lighting elements 12 define a backlight area 13.
The backlight module further comprises a fluorescent film 15 and a prism light guide structure 14, wherein the fluorescent film 15 is arranged on the light emitting side of the LED light emitting element 12 and is opposite to the first surface 111 of the substrate 11; the prism light guide structure 14 is arranged at the periphery of the backlight area; a fluorescent powder layer 17 is arranged on the outer surface of the prism light guide structure 14; the prism light guide structure 14 is used for changing the propagation direction of the emergent light of the LED light emitting element 12 adjacent to the prism light guide structure 14.
For clarity of illustrating the layout of the LED light emitting elements 12, the phosphor film 15 and the phosphor layer 17 on the surface of the prism light guiding structure 14 are not shown in fig. 1. For clarity of illustration of different viewing angles and orientations in the drawings of the present invention, the drawings of the present invention are all based on the same three-dimensional rectangular coordinate system XYZ as a reference, and the first surface 111 of the substrate 11 is parallel to the XY plane.
The substrate 11 has a first surface 111 and a second surface 112 opposite to each other, and the LED light-emitting element 12 and the prism light-guiding structure 14 are disposed on the first surface 111 of the substrate 11.
In the backlight module according to the embodiment of the present invention, the prism light guide structures 14 are disposed on the periphery of the backlight area 13, so that the plurality of prism light guide structures 14 are disposed on the periphery of the backlight area 13, and the propagation direction of the light emitted from the LED light emitting elements 12 adjacent to the prism light guide structures 14 can be changed to reduce the incident angle of the emitted light with respect to the fluorescent film 15, so that the light emitted from the backlight module to the periphery is incident on the fluorescent film 15 at a smaller incident angle or is incident on the fluorescent film 15 perpendicularly, thereby increasing the intensity of the light incident on the periphery of the fluorescent film 15 and exciting more white light emitted from the periphery of the fluorescent film 15.
Further, the surface of the prism light guide structure 14 provided by the embodiment of the invention is provided with the phosphor layer 17, and the aggregation of the peripheral blue light can be avoided through the scattering effect of the phosphor particles, so that the problem that the peripheral edge backlight of the backlight module is deviated from blue can be solved, and the image display quality is improved.
Optionally, the LED light emitting element 12 emits blue light for exciting the fluorescent film 15 to emit white light. The fluorescent film 15 includes red phosphor and green phosphor, and can emit white light by blue laser light, and provide uniform white backlight for the liquid crystal display panel.
For the prism light guide structure 14, the phosphor layer 17 disposed on the surface thereof includes red phosphor and/or green phosphor. The phosphor layer 17 may be disposed on the surface of the prism light guide structure 14 through a coating process. When the prism light guide structure 14 is only disposed on the periphery of the backlight area 13, the phosphor layer 17 includes red phosphor and green phosphor, so that blue light incident on the prism light guide structure 14 can excite the phosphor layer 17 to emit white light, thereby reducing blue light on the periphery of the backlight area 13 and avoiding the problem of blue light bias on the periphery.
The back surface of the LED light emitting element 12 is bound on the first surface 11 of the substrate 11, the substrate 11 is a circuit board and has an interconnection circuit for electrically connecting with the control chip, and two electrodes on the back surface of the LED light emitting element 12 are electrically connected with the interconnection circuit, and the control chip controls the LED light emitting element 12 to be turned on and off.
The LED light emitting element 12 may be a Mini LED, which is an LED having a size of 100 μm or more. From the aspect of manufacturing process, the Mini LED has a High yield and a special-shaped cutting characteristic compared with the Micro LED, can be matched with a flexible substrate and a High-curved backlight or a rigid non-bendable substrate, and can divide the backlight area 13 into a plurality of local dimming areas by adopting a local dimming design, each local dimming area includes at least one LED light-emitting element, and the light-emitting state of each local dimming area can be independently controlled, so that the light-emitting state of each local dimming area can be controlled according to the brightness and/or chromaticity information of an image to be displayed, and a display image has better color rendering property, can bring more fine HDR (High-Dynamic Range, High Dynamic Range, image) partitions to a liquid crystal panel, has a thickness close to an OLED panel, is convenient for light and thin design, and has a power saving function. In other embodiments, the LED light emitting element 12 may be a Micro LED. Micro LEDs are LED scaling and matrixing technologies, and simply speaking, LED backlights are thinned, miniaturized, and arrayed, so that an LED light-emitting element 12 can be smaller than 100 μm, and each pixel can be addressed independently and driven to emit light (self-luminescence) independently as in an OLED.
In the embodiment shown in fig. 1 and 2, the prism light guide structure 14 is disposed only at the periphery of the backlight area 13, so as to reduce the problem of polarization at the periphery of the backlight area 14.
In the backlight module according to the embodiment of the invention, the plurality of LED light emitting elements 12 may be arranged in an array, so as to facilitate the arrangement of the LED light emitting elements 12, and at the same time, the LED light emitting elements may be uniformly arranged on the first surface 111 of the substrate 11, so as to form a surface light source with better uniformity. The top surface of the LED light emitting element 12 away from the substrate 11 is a surface of the main outgoing light, the outgoing light of the surface has a certain divergence angle, and the side surface of the surface can emit light with a certain intensity, but the intensity of the outgoing light is weaker than that of the top surface, so the intensity of the outgoing light between adjacent LEDs is weaker, which may cause a white bright spot in the backlight area corresponding to the LED light emitting element 12, and the white light at the gap position of the LED light emitting element 12 is weaker, so that the white light brightness in the backlight area 12 is not uniform. Therefore, in order to improve the uniformity of white light, the prism light guide structure 14 may be disposed between two adjacent LED light emitting elements 12 in the same row, and/or the prism light guide structure 14 may be disposed between two adjacent LED light emitting elements 12 in the same column. The gap is the distance position between two adjacent LEDs in the same row or the same column.
The prism light guide structure can adjust the propagation path of light, and reduce the incident angle of the light with respect to the phosphor film 15, so that the light is converged toward the vertical direction of the phosphor film 15. Therefore, the prism light guide structure 14 is arranged between two adjacent LED light emitting elements 12, so that light between the gap between the two LED light emitting elements 12 can be converged in the vertical direction of the fluorescent film region opposite to the gap, thereby improving the light brightness between the gaps, exciting the fluorescent film 15 to emit more blue light, improving the white light brightness corresponding to the gap position of the LED light emitting elements 12, and improving the white light uniformity of the backlight region 13.
Referring to fig. 3 and 4, fig. 3 is a top view of a layout of LED light emitting elements in another backlight module according to an embodiment of the present invention, fig. 4 is a cross-sectional view of fig. 3 taken at P-P', the fluorescent film 15 is not shown in fig. 3, and the fluorescent film 15 and the phosphor layer 17 on the surface of the prism light guide structure 14 are not shown in fig. 3. In this way, one prism light guide structure 14 is arranged between two adjacent LED light emitting elements 12 in the same row, and one prism light guide structure 14 is arranged between two adjacent LED light emitting elements 12 in the same column, so that the uniformity of the white light emitted from the backlight area 13 can be greatly improved.
In other manners, one prism light guide structure 14 may be disposed between two adjacent LED light emitting elements 12 in the same row, or one prism light guide structure 14 may be disposed between two adjacent LED light emitting elements 12 in the same column, so that the white light uniformity may be improved to a certain extent.
When the prism light guide structures 14 are disposed between the LED light emitting elements 12, the phosphor layer 17 on the surface of all the prism light guide structures 14 may only be disposed with phosphor of one color, such as red phosphor or green phosphor, so that the ratio of the color light in the emitted white light can be increased by the single color phosphor on the surface of the prism light guide structures 14, and the viewing comfort of the user can be improved.
In the backlight module of the embodiment of the invention, the height of the prism light guide structure 14 is greater than that of the LED light emitting element 12; in a direction perpendicular to the substrate 11, the prism light guide structure 14 has a first end facing the substrate 11 and a second end facing the fluorescent film 15; the first end abuts against the substrate 11 and/or the second end abuts against the phosphor film 15.
In the embodiment of the present invention, it is preferable that the first end is disposed to abut against the substrate 11, so that since the height of the prism light guide structure 14 is greater than the height of the LED light emitting element 12, light emitted from the LED light emitting element 12 toward the periphery thereof can be incident on the prism light guide structure 14, and further, the emitting direction is adjusted by the prism light guide structure 14, and the light is incident on the fluorescent film 15 at a smaller incident angle.
When the first end abuts against the substrate 11, the second end may abut against the phosphor screen 15, or may have a set pitch with respect to the phosphor screen 15. The first end may be abutted against the substrate 11, and the second end may be abutted against the fluorescent film 15, so as to reduce the distance between the fluorescent film 15 and the substrate 11 and reduce the thickness of the backlight module.
Optionally, a planarization adhesive layer 16 is disposed on the surface of the substrate 11, and the LED light-emitting element 12 and the prism light guide structure 14 are both located in the planarization adhesive layer 16. The LED light emitting element 12 may be bound on the first surface 111 of the substrate 11, and then the planarization adhesive layer 16 is disposed on the surface, and after curing, a groove is formed at a corresponding position of the planarization adhesive layer 16 for placing the prism light guiding structure 14. Or binding the LED light emitting element 12 and the prism light guiding structure 14 temporarily on the first surface of the substrate 11, and forming the planarization adhesive layer 16 to completely fix the prism light guiding structure 14.
In an embodiment of the present invention, the prism light guide structure 14 may be a triangular prism, and the triangular prism is used for changing the propagation direction of the light through refraction and/or total reflection.
When the prism light guide structure 14 is a triangular prism, as shown in fig. 5, fig. 5 is a schematic diagram of a principle of adjusting an optical path of the prism light guide structure provided by the embodiment of the present invention, the prism light guide structure 14 is a triangular prism, and a section of the triangular prism perpendicular to an edge is an isosceles acute triangle; the vertex angle of the isosceles acute triangle faces the substrate, the vertex angle can be abutted or not abutted with the substrate 11, the bottom edge faces the fluorescent film 15, the base edge is parallel to the fluorescent film, and the bottom edge can be abutted or not abutted with the fluorescent film 15.
In this way, the light propagation direction is as shown by the dotted arrow, a waist side of the isosceles acute angle triangle section of the triangular prism obtains the light obliquely emitted from an adjacent LED light emitting element 12, total reflection and refraction transmission occur at another waist side, the light after total reflection passes through the bottom side incident fluorescent film 15, the light after refraction transmission enters the fluorescent film 15, thereby making a part of the light after total reflection and another part of the light after refraction transmission enter the fluorescent film 15 at a smaller incident angle, changing the light propagation path, improving the light uniformity and avoiding the peripheral bluish problem.
For clarity of illustration of the light propagation path, only one prism light guide structure 14 corresponding to the propagation path of the incident light of one LED light emitting element 12 is shown in the manner shown in fig. 5.
When the prism light guide structures 14 are provided only at the periphery of the backlight area 13, each prism light guide structure 14 has only one side surface to take light rays obliquely incident from the adjacent LED light emitting elements 14. When the prism light guide structure is disposed at the periphery of the backlight area 13 and the prism light guide structure 14 is also disposed between two adjacent LED light emitting elements 12, as shown in fig. 5, one prism light guide structure 14 is shared between two adjacent LED light emitting elements 12, and for the prism light guide structure 14 between two adjacent LED light emitting elements 12, the light transmission path of the two LED light emitting elements incident to the side surface thereof can be adjusted at the same time.
In other ways, when the prism light guide structure is a triangular prism, as shown in fig. 6, fig. 6 is a schematic diagram of a principle of adjusting an optical path of another prism light guide structure provided in the embodiment of the present invention, the prism light guide structure 14 is a triangular prism, and a section of the triangular prism perpendicular to an edge is an isosceles right triangle; one right-angle side of the isosceles right triangle faces the fluorescent film 15 and is parallel to the fluorescent film, and the other right-angle side of the isosceles right triangle is perpendicular to the first surface of the substrate 11.
In this way, the light propagation direction is as indicated by the dotted arrow, the right-angle side of the triangular prism perpendicular to the substrate 11 faces the adjacent LED light emitting element 12, the oblique light emitted from the LED light emitting element 12 is obtained, and after the total reflection is emitted from the bottom side of the oblique light, the fluorescent film 15 is incident from the other right-angle side, so that the fluorescent film 15 is incident at a smaller incident angle, the light propagation path is changed, the light uniformity is improved, and the problem of partial blue at the periphery is avoided.
For clarity of illustration of the light propagation path, only one prism light guide structure 14 corresponding to the propagation path of the incident light of one LED light emitting element 12 is shown in the manner shown in fig. 6.
When the prism light guide structures 14 are disposed only on the periphery of the backlight area 13, the LED light emitting elements 12 located around the backlight area 13 are each disposed with one prism light guide structure 14 correspondingly on the outer side of the backlight area 13. When the prism light guide structure is disposed at the periphery of the backlight area 13 and the prism light guide structure 14 is also disposed between two adjacent LED light emitting elements 12, as shown in fig. 6, two prism light guide structures 14 are disposed between two adjacent LED light emitting elements 12, so that each LED light emitting element 12 correspondingly enters one LED light emitting element respectively and total reflection occurs.
In the above embodiment, the prism light guide structure 14 is illustrated as a triangular prism, but in another embodiment, the prism light guide structure 14 may be a condensing lens for condensing incident light in a direction perpendicular to the phosphor layer.
The condensing lens is a convex lens, at this time, the structure of the backlight module is as shown in fig. 7, fig. 7 is a schematic view illustrating a principle of adjusting an optical path of another prism light guide structure provided in an embodiment of the present invention, and the prism light guide structure 14 is a convex lens. In this embodiment, the convex lens has an incident surface and an exit surface facing each other, the incident surface being a convex curved surface, and the exit surface being a concave curved surface facing the phosphor film 15. In this manner, the direction of light propagation is shown by the dashed arrow,
for clarity of illustration of the light propagation path, only one prism light guide structure 14 corresponding to the propagation path of the incident light of one LED light emitting element 12 is shown in the manner shown in fig. 7.
When the prism light guide structures 14 are disposed only on the periphery of the backlight area 13, the LED light emitting elements 12 located around the backlight area 13 are each disposed with one prism light guide structure 14 correspondingly on the outer side of the backlight area 13. When the prism light guide structure is disposed at the periphery of the backlight area 13 and the prism light guide structure 14 is also disposed between two adjacent LED light emitting elements 12, as shown in fig. 7, when one shared prism light guide structure 14 is disposed between two adjacent LED light emitting elements 12, the prism light guide structure 14 between two adjacent LED light emitting elements 12 can simultaneously adjust the light transmission path of the two LED light emitting elements incident to the side surface thereof. In this embodiment, the upper end of the condenser lens abuts the phosphor screen 15, and the lower end thereof may abut the substrate 11 or have a predetermined pitch.
When the prism light guide structure 14 is a condensing lens, the backlight module may be further shown in fig. 8, and fig. 8 is a schematic diagram illustrating an optical path adjustment principle of another prism light guide structure provided in an embodiment of the present invention, which is different from fig. 7 in that the structure of the condensing lens is different, in which the condensing lens is also a convex lens and has an incident surface and an exit surface, the incident surface is a convex curved surface, and the exit surface is a plane parallel to and opposite to the fluorescent film 15.
When the prism light guide structure 14 is a condensing lens, the prism light guide structure 14 may be a condensing element having a plurality of protrusion structures. In this way, the incident angle of light incident on the fluorescent film 15 is also adjusted by using the convex lens condensing principle, so that the light is incident on the fluorescent film at a smaller angle, thereby avoiding the blue bias problem at the periphery of the backlight area 13 and improving the uniformity of white light.
The backlight module further comprises a diffusion film arranged on one side of the fluorescent film 15, which is far away from the LED light-emitting element 12, and a brightness enhancement film arranged on one side of the diffusion film, which is far away from the fluorescent film 15. The diffusion film is used for improving the uniformity of the emergent backlight. The brightness enhancement film comprises two layers of prism sheets which are fixed relatively and used for improving the collimation of emergent light. The two layers of prism sheets are bonded and fixed through the adhesive layer, the adhesive layer is provided with fluorescent powder for improving the uniformity of emergent light through diffusion, and the color of the fluorescent powder can be set according to requirements, such as the mixture of red fluorescent powder and green fluorescent powder, or the red fluorescent powder, or the green fluorescent powder.
The backlight module of the embodiment of the invention is a direct type backlight module, all the LED light emitting elements 12 are positioned on the first surface of the same substrate 11 and can emit a surface light source, and the prism light guide structure 14 is arranged, so that the problem of partial blue at the periphery of the backlight area 13 can be avoided and the uniformity of emitted white light can be improved.
Based on the above backlight module, another embodiment of the present invention further provides a liquid crystal display module, where the liquid crystal display module is shown in fig. 9, and fig. 9 is a schematic structural diagram of the liquid crystal display module provided in the embodiment of the present invention, and the liquid crystal display module includes: a liquid crystal display panel 52 and a backlight module 51 arranged oppositely; the backlight module 51 is the backlight module described in the above embodiments.
The liquid crystal display module adopts the backlight module of the embodiment, so that the problem that the periphery of a backlight area is slightly blue is avoided, the uniformity of emergent light is improved, and the image display quality is improved.
Based on the above backlight module embodiment and the liquid crystal display module embodiment, another embodiment of the present invention further provides an electronic device, where the electronic device is shown in fig. 10, fig. 10 is a schematic structural diagram of the electronic device provided in the embodiment of the present invention, the electronic device includes a liquid crystal display module 61, and the liquid crystal display module 61 is the liquid crystal display module in the above embodiment.
The electronic equipment provided by the embodiment of the invention can be mobile phones, tablet computers, notebook computers, televisions, wearable equipment and other electronic equipment with a display function. The electronic equipment adopts the liquid crystal display module of the embodiment, so that the problem that the periphery of a backlight area is blue is avoided, the uniformity of emergent light is improved, and the image display quality is improved.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the liquid crystal display module and the electronic device disclosed in the embodiments, since the liquid crystal display module and the electronic device disclosed in the embodiments correspond to the backlight module disclosed in the embodiments, the description is relatively simple, and the relevant points can be referred to the description of the corresponding parts of the backlight module.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A backlight module is characterized in that the backlight module comprises:
a substrate;
the LED light-emitting elements are arranged on the first surface of the substrate and electrically connected with the substrate, and all the LED light-emitting elements define a backlight area;
the fluorescent film is arranged on the light emitting side of the LED light-emitting element and is opposite to the first surface of the substrate;
the outer surface of the prism light guide structure is provided with a fluorescent powder layer;
the prism light guide structure is used for changing the transmission direction of emergent light rays of the LED light-emitting elements adjacent to the prism light guide structure; the prism light guide structure is arranged on the periphery of the backlight area.
2. The backlight module as claimed in claim 1, wherein the LED light emitting elements emit blue light for exciting the phosphor film to emit white light.
3. The backlight module according to claim 1, wherein the phosphor layer comprises red phosphor and/or green phosphor.
4. The backlight module according to claim 1, wherein the plurality of LED light emitting elements are arranged in an array, and the prism light guide structure is disposed between two adjacent LED light emitting elements in a same row, and/or the prism light guide structure is disposed between two adjacent LED light emitting elements in a same column.
5. A backlight module according to claim 1, wherein the height of the prism light guide structure is greater than the height of the LED light emitting element;
in a direction perpendicular to the substrate, the prismatic light guiding structure has a first end facing the substrate and a second end facing the phosphor film;
the first end abuts against the substrate, and/or the second end abuts against the fluorescent film.
6. The backlight module as claimed in claim 1, wherein the substrate has a planarization adhesive layer on a surface thereof, and the LED light emitting elements and the prism light guiding structure are at least partially disposed in the planarization adhesive layer.
7. A backlight module according to any of claims 1-6, wherein the prismatic light directing structure is a triangular prism for changing the propagation direction of the light rays by refraction and/or total reflection.
8. The backlight module according to claim 7, wherein when the prism light guide structure is a triangular prism, the section of the triangular prism perpendicular to the edge is an isosceles acute triangle;
the vertex angle of the isosceles acute triangle faces the substrate, and the bottom edge of the isosceles acute triangle faces the fluorescent film and is parallel to the fluorescent film.
9. The backlight module as claimed in claim 7, wherein when the prism light guide structure is a triangular prism, the cross section of the triangular prism perpendicular to the edge is an isosceles right triangle;
one right-angle side of the isosceles right triangle faces the fluorescent film and is parallel to the fluorescent film, and the other right-angle side of the isosceles right triangle is perpendicular to the first surface of the substrate.
10. The backlight module according to any one of claims 1-6, wherein the prism light guide structure is a condensing lens for condensing incident light toward a direction perpendicular to the phosphor film.
11. The backlight module as claimed in claim 10, wherein the condensing lens is a convex lens or a condensing element having a plurality of protrusions.
12. The utility model provides a liquid crystal display module assembly which characterized in that, liquid crystal display module assembly includes:
the liquid crystal display panel and the backlight module are oppositely arranged;
the backlight module as claimed in any one of claims 1-11.
13. An electronic device, characterized in that the electronic device comprises the liquid crystal display module according to claim 12.
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| CN111583781B (en) * | 2019-02-18 | 2022-12-27 | 诚屏科技股份有限公司 | Multi-screen display device |
| CN109754711B (en) * | 2019-03-08 | 2021-03-02 | 京东方科技集团股份有限公司 | Backlight module, preparation method thereof and display device |
| CN113936541B (en) * | 2020-06-29 | 2023-02-21 | 京东方科技集团股份有限公司 | Direct type backlight module and display device |
| CN113570964B (en) * | 2021-02-21 | 2023-04-07 | 深圳市汇晨电子股份有限公司 | Bendable MiniLED backlight source and manufacturing process thereof |
| CN113917733A (en) * | 2021-04-19 | 2022-01-11 | 北京显芯科技有限公司 | Mini-LED backlight display screen |
| CN113093439A (en) * | 2021-04-23 | 2021-07-09 | 业成科技（成都）有限公司 | Backlight module, preparation method thereof and display device |
| CN114236905A (en) * | 2021-12-14 | 2022-03-25 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN115047678B (en) * | 2022-06-30 | 2024-01-16 | 厦门天马微电子有限公司 | Backlight module and display device |
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