WO2019184163A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2019184163A1
WO2019184163A1 PCT/CN2018/097491 CN2018097491W WO2019184163A1 WO 2019184163 A1 WO2019184163 A1 WO 2019184163A1 CN 2018097491 W CN2018097491 W CN 2018097491W WO 2019184163 A1 WO2019184163 A1 WO 2019184163A1
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WO
WIPO (PCT)
Prior art keywords
flexible substrate
backlight
light emitting
backlight module
emitting diode
Prior art date
Application number
PCT/CN2018/097491
Other languages
English (en)
French (fr)
Inventor
查国伟
崔宏青
马长文
程艳
Original Assignee
武汉华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US16/211,500 priority Critical patent/US10824008B2/en
Publication of WO2019184163A1 publication Critical patent/WO2019184163A1/zh

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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
    • G02F1/1336—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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • 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
    • G02F1/133612—Electrical details
    • 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

Definitions

  • the present application relates to the field of display technologies, and in particular, to a backlight module and a display device.
  • Organic Light Emitting Diode Display Device Organic Light Emitting Display, OLED
  • OLED Organic Light Emitting Display
  • the traditional liquid crystal display technology has gradually adopted a flexible substrate to break through in the direction of flexibility and curved surface. It can be seen that the era of flexible and curved display is coming.
  • the upper border (border), left border, and right border of the display are compressed to a very narrow border to meet the needs of the full screen; however, at the lower border, due to the need to do data line sectors (Data The line fanout) and the bonding to the peripheral circuit make the further compression of the lower boder a technical problem that is urgently needed to be solved.
  • the liquid crystal display adopts the technology of side-entry light input, and its LED
  • the lightbar is located at the lower border of the display.
  • the LED strip has a certain thickness.
  • the LED acts as a point source, it needs to diffuse the light evenly through the astigmatism of the light guide to avoid the hotspot (hot zone) at the low beam. Phenomenon, therefore, the need to mix the light distance, the compression of the mixed light distance is usually accompanied by a sharp attenuation of the backlight efficiency, so that the backlight backlight frame of the liquid crystal module has a certain limit value. Therefore, under the LCD
  • the boder size is a key factor in achieving a full screen (extremely narrow border).
  • the present invention provides a backlight module and a display device, which can solve the technical problem that the backlight module in the conventional liquid crystal display device is too wide due to the lightbar width and the light mixing distance.
  • a technical solution adopted by the present application is to provide a backlight module, which includes a flexible substrate, a light emitting diode, a fluorescent film, a diffusion film, and a brightness enhancement film; wherein the flexible substrate a driving circuit is disposed on the non-backlight region of the flexible substrate, one side of the flexible substrate extends along the non-backlight region and is bent below the backlight region of the flexible substrate, and the LED array is arranged
  • the fluorescent film, the diffusion film, and the brightness enhancement film are sequentially formed on the light emitting diode, wherein the size of the light emitting diode is 100-1000 ⁇ m, and the flexible substrate The thickness ranges from 0.02 to 0.2 mm.
  • a backlight module which includes a flexible substrate, a light emitting diode, a fluorescent film, a diffusion film, and a brightness enhancement film; wherein the flexibility
  • the substrate includes a driving circuit disposed on the non-backlight region of the flexible substrate, and one side of the flexible substrate extends along the non-backlight region and is bent below the backlight region of the flexible substrate, and the LED array is arranged
  • the fluorescent film, the diffusion film, and the brightness enhancement film are sequentially formed over the light emitting diode in the backlight region of the flexible substrate.
  • the display device includes a display module backlight module, and the backlight module and the display module are oppositely disposed;
  • the display module includes a first substrate, a second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate;
  • the display module includes a display area and a non-display area, and the At least one side of the second substrate extends along the non-display area and is bent below the backlight module to cover at least a portion of the backlight module.
  • the backlight module includes a flexible substrate, a light emitting diode, a fluorescent film, a diffusion film and a brightness enhancement film; wherein the flexible substrate comprises a driving circuit disposed on a non-backlight region of the flexible substrate, one side of the flexible substrate extending along the non-backlight region and being bent to the flexible substrate.
  • the light emitting diode array is arranged in the backlight area of the flexible substrate, and the fluorescent film, the diffusion film and the brightness enhancement film are sequentially formed above the light emitting diode.
  • the utility model has the beneficial effects of providing a backlight module and a display device, which can effectively compress the light mixing distance of the light emitting diode by using a dense array of light emitting diodes, and bend one side of the non-backlight region of the flexible substrate Down to the backlight area, the width of the lower frame of the backlight module is reduced, so that a full screen can be realized.
  • FIG. 1 is a schematic structural view of a first embodiment of a backlight module of the present application
  • FIG. 2 is a schematic structural view of an embodiment of a flexible substrate in a backlight module of the present application
  • FIG. 3 is a schematic structural view of a first embodiment of a backlight module of the present application.
  • FIG. 4 is a schematic structural view of an embodiment of a display device of the present application.
  • FIG. 1 is a schematic structural view of a first embodiment of a backlight module of the present application
  • FIG. 2 is a schematic structural view of a flexible substrate in the backlight module of the present application.
  • the backlight module 10 of the present application includes a flexible substrate 11 , a light emitting diode 12 , a fluorescent film 13 , a diffusion film 14 , and a brightness enhancement film 15 .
  • the flexible substrate 11 used in the present application may be made of colorless polyimide (PI), polycarbonate (PC), polynorbornene (PNB), and polyethylene terephthalate ( One of PET).
  • PI colorless polyimide
  • PC polycarbonate
  • PPB polynorbornene
  • PET polyethylene terephthalate
  • polyimide is used as the flexible substrate 11.
  • the flexible substrate 11 includes a backlight area A and a non-backlight area B, wherein the non-backlight area B extends along one side of the flexible substrate 11 and is bent below the backlight area A of the flexible substrate 11.
  • the flexible substrate 11 further includes a driving circuit (not shown) disposed on the non-backlight region B of the flexible substrate 11.
  • the array of the light emitting diodes 12 is arranged on the backlight area A of the flexible substrate 11, and the fluorescent film 13, the diffusion film 14 and the brightness enhancement film 15 are sequentially formed on the light emitting diodes 12, thereby forming the backlight module 10.
  • the backlight module 10 of the present embodiment arranges the array of the light emitting diodes 12 in the backlight area A of the flexible substrate 11 through the direct type backlight, and bends the driving circuit of the non-backlight area B to the lower side of the backlight area of the flexible substrate 11.
  • the width of the lower frame of the backlight module 10 can be reduced, and after being paired with the display module, The width of the lower frame of the display device is lowered, so that a full screen display can be realized.
  • the flexible substrate 11 includes a first wire layer 101 and a second wire layer 102.
  • the first wire layer 101 is electrically connected to the second wire layer 103, wherein the first wire layer 101 is connected to the driving circuit, and the second wire layer 102 is connected. led.
  • the flexible substrate 11 is a film stack structure, and the thickness of the flexible substrate 11 ranges from 0.02 to 0.2 mm. Further, the thickness of the flexible substrate 11 ranges from 0.05 to 0.18 mm, and may also be specifically 0.11 mm, 0.15 mm, and the like. , no further restrictions here.
  • the flexible substrate 11 of the lower frame of the display panel is bent (ie, corresponding to the non-backlight region B of the flexible substrate 11), and is bent to the backlight of the flexible substrate 11 Below area A.
  • the flexible substrate 11 includes at least a first wire layer 101, a second wire layer 102, an insulating layer 103, and a flexible substrate 104.
  • the insulating layer 103 is disposed between the first wire layer 101 and the second wire layer 102.
  • the first wire layer 101 and the second wire layer 102 are electrically connected through the through holes of the insulating layer 103; while the first wire layer 101 is disposed inside the flexible substrate 11, and the second wire layer 102 is disposed outside the flexible substrate 11, and It faces the light emitting diode 12.
  • multiple layers of wire layers may be included to achieve electrical connection between different layers, or to include a flexible substrate.
  • the second wire layer 102 includes an anode bonding pad and a cathode bonding pad corresponding to the light emitting diode 12, and the LED 12 passes through the one-to-one corresponding anode bonding pad and the cathode bonding pad and the second wire layer 102.
  • the electrical connection is further connected to the driving circuit through the first wire layer 101 to realize the driving circuit to control the switch of the LED 12.
  • the light emitting diodes 12 in this embodiment may be arranged on the flexible substrate 11 in an array by using a blue mini-LED.
  • the illuminating diode 12 and the anode binding pad and the cathode binding pad on the flexible substrate 11 are bonded by other conductive bonding methods such as solder paste, silver glue, and anisotropic conductive film ACF, thereby implementing the LED 12 A fixed and conductive circuit, and can also use a typical COB (chip On board) process preparation, which will not be described here.
  • COB chip On board
  • the corresponding fluorescent film 13 is a yellow fluorescent film, and the yellow light is excited by the blue light emitted by the blue light emitting diode, and the white light is obtained by mixing with the blue light of the unexcited fluorescent film. Further, the fluorescent film 13 is stacked in a film structure on the periphery and above of the blue LED.
  • the size of the light emitting diode 12 may be 100-1000 ⁇ m, specifically 100 ⁇ m, 550 ⁇ m, 1000 ⁇ m, and the like.
  • the pitch of the adjacent light emitting diodes may be 100-2000 ⁇ m, specifically 100 ⁇ m, 1050 ⁇ m, 2000 ⁇ m, etc., which is not further limited herein. Because the light-emitting diode 12 adopts a dense arrangement array, the light-mixing distance of the mini-LED can be effectively compressed, so that the light-mixing distance of the backlight module 10 is less than 1000 ⁇ m, which is different from the thickness of the backlight module of the existing small-sized side-entry LCD. Small, does not affect the thin and light requirements of existing mobile devices.
  • the light emitting diode 12 can also be an ultraviolet light emitting diode.
  • the corresponding fluorescent film 13 can be a mixture of phosphors of at least two colors, and specifically can be red, green, and blue. The powder is mixed and mixed under the action of ultraviolet light emitted by the ultraviolet light-emitting diode to obtain white light.
  • the fluorescent film 13 can also be mixed with two complementary color phosphors, such as yellow + blue phosphor, magenta + green phosphor, red + cyan phosphor mixed with silica gel, in the role of ultraviolet light. Under the excitation of synthetic white light.
  • the light-emitting diode 12 can be a light-emitting diode of three primary colors.
  • the light emitted by the three primary color light-emitting secondary light can be directly mixed to obtain white light, that is to say, the fluorescent film 13 can be omitted in the technical solution, as shown in FIG. 3 is a schematic structural view of a second embodiment of a backlight module in the present application.
  • the diffusion film 14 mainly functions to correct the diffusion angle in the backlight module, and the area of the light radiation is increased. After the light-emitting source of the light-emitting diode 12 is diffused through the diffusion film 14, it can become a secondary light source having a larger area, a better uniformity, and a stable chromaticity.
  • the basic structure of the diffusion film 14 is to apply optical astigmatism particles on the transparent substrate, such as PET.
  • the preparation method and process can refer to the method and the process for preparing the display panel in the prior art, which is not limited herein. Since the light source passing through the diffusion film 14 reduces the light intensity per unit area, the brightness requirement of the display panel cannot be satisfied, and thus the film which increases the brightness, that is, the brightness enhancement film 15, is required.
  • the prism film is the most widely used brightening product, so the prism film is a kind of brightness enhancing film 15, which is a transparent plastic film with a thickness of 50 to 300 microns on the upper surface of the film.
  • the prism film is placed between the diffusion film 14 of the backlight module and the liquid crystal module, and its function is to improve the angular distribution of light, which can be uniformly emitted from the diffusion film 14.
  • Light diverging at various angles converges to an axial angle, i.e., a front view angle, which increases axial brightness without increasing the total luminous flux exiting.
  • the light-mixing distance of the light-emitting diodes can be effectively compressed, and the direct-lighting light-in design is adopted, so that the upper, lower, left, and right sides of the backlight module have equal borders.
  • Width the width of the frame is limited only by the width of the frame, the stacking tolerance of the film, etc., so that the lower frame of the backlight module reaches the horizontal of the left and right frames of the side-entry backlight template, that is, the width of the lower frame can be reduced to 0.5-1 mm, thereby A backlight module that achieves an extremely narrow border.
  • FIG. 3 is a schematic structural diagram of an embodiment of a display device of the present application.
  • the display device 20 includes a display module 30 and a backlight module C of any one of the above, and the backlight module C and the display module 30 are oppositely disposed, wherein the specific structure of the backlight module C is
  • the display device 20 includes a display module 30 and a backlight module C of any one of the above, and the backlight module C and the display module 30 are oppositely disposed, wherein the specific structure of the backlight module C is
  • the display module 30 of the present application may further include a first substrate 31, a second substrate 32, and a liquid crystal layer D sandwiched between the first substrate 31 and the second substrate 32.
  • the first substrate 31 may be a color film substrate
  • the second substrate 32 may be an array substrate.
  • the first substrate 31 may also be an array substrate
  • the second substrate 32 may be a color film substrate, which is not further limited herein.
  • the second substrate 32 in this embodiment is an array substrate (Array), and the deflection of the liquid crystal layer D is driven by providing a thin film transistor (TFT) device array.
  • the second substrate 32 is a flexible substrate, and the material thereof can be colorless polyimide (PI), polycarbonate (PC), polynorbornene (PNB), and polyethylene terephthalate (PET). One of them. Polyimide is used in this embodiment.
  • the second substrate 32 may include a data line fanout of the data line and a driving circuit binding area (IC). Bonding) and flexible board bonding area (FPC) Bonding). And the process is the same as the traditional LCD structure, only the low temperature (300-400 ° C) colorless PI is used to replace the traditional glass substrate, so the Array process segment needs to be matched by a low temperature compatible process.
  • IC driving circuit binding area
  • FPC flexible board bonding area
  • the display module 30 includes a display area and a non-display area, and at least one side of the second substrate 32 extends along the non-display area and is bent below the backlight module C to cover one of the backlight modules C. side.
  • the lower frame area (one side of the second substrate 32) of the display module 30 is bent and bent to the backlight of the backlight module C.
  • the area below the area is fixed by the adhesive, so that the fan-out area and the driving circuit binding area of the lower frame area of the display module 30 are bent to the back of the backlight module 10, thereby visually reducing the width of the front lower frame area. , can achieve a full screen display effect.
  • the thickness of the backlight module C is about 1 mm
  • the second substrate 32 is fixed to the flexible substrate in the backlight module C by bending.
  • the bending radius of the second substrate 32 is about half of the thickness of the backlight module C, and has a large radius of curvature to avoid electrical instability caused by breakage of the second substrate 32 at the bend.
  • the presence of the bending radius of the second substrate 32 inevitably increases the thickness of the lower frame of the display module (the frame width of the bending region requires a whole machine accommodation space), but the mini-LED backlight design of the backlight module C
  • the low-thickness feature ensures a small frame loss and facilitates the design of a narrow bezel display panel.
  • the display module 30 in the present application further includes a first polarizer 33 and a second polarizer 34.
  • the first polarizer 33 is disposed on a surface of the first substrate 31 away from the liquid crystal layer D
  • the second polarizer 34 is disposed on a surface of the second substrate 32 remote from the liquid crystal layer D.
  • the first polarizer 33 and the second polarizer 34, the first substrate 31, and the liquid crystal layer D are conventional structures, and are not particularly limited herein.
  • the same material as the existing hard screen design is used, that is, the first substrate 31 still uses a glass substrate compatible with the existing liquid crystal display process, the first polarizer 33 and The design of the second polarizer 34 and the liquid crystal cell also does not require consideration of a flexible reliability design. Of course, it is not excluded to adopt the structure for flexible display. In addition to the second substrate 32, the other structures also need to be synchronously flexible.
  • the display device 20 provided by the present application may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the width of the lower frame of the backlight module can be reduced, and when the display module is paired with the display module, The non-display area of the second substrate of the display module (including the fan-out area, the driving binding area, and the flexible circuit binding area) is bent to the side of the backlight module that covers the backlight module, thereby reducing the display device
  • the width of the lower border, and the display module with a narrow border backlight module and a narrow border can achieve a full screen display effect.
  • the present application provides a display panel and a display device, which can be reduced by bending a driving circuit of a non-backlight region of a flexible substrate in a backlight module to a lower portion of a backlight region.
  • the non-display area (including the fan-out area, the driving binding area, and the flexible circuit binding area) of the second substrate of the display module is bent to The side of the backlight module covering the backlight module can reduce the width of the lower frame of the display device, and the backlight module with a narrow frame and the display module of the narrow frame can realize the display effect of the full screen.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

一种背光模组（10）及显示装置，背光模组（10）包括柔性基板（11）、阵列排布的发光二极管（12）、荧光膜（13）、扩散膜（14）以及增亮膜（15）；其中，柔性基板（11）包括背光区（A）及非背光区（B），发光二极管（12）设置在柔性基板（11）上的背光区（A）；荧光膜（13）、扩散膜（14）以及增亮膜（15）依次设置在发光二极管（12）上；柔性基板（11）还包括驱动电路，驱动电路设置在柔性基板（11）的非背光区（B），并弯折至背光区（A）的背面，电连接发光二极管（12）。背光模组（10）能够有效压缩发光二极管（12）的混光距离，且同时降低了显示装置的下边框宽度，从而可以实现全面屏。

Description

背光模组及显示装置
【技术领域】
本申请涉及显示技术领域，特别是涉及一种背光模组及显示装置。
【背景技术】
随着可穿戴应用设备如智能眼镜、智能手表等的逐渐兴起，显示面板行业对可挠曲显示器件的需求也不断增加。有机发光二极管显示器件 (Organic Light Emitting Display，OLED) 具有自发光不需背光源、厚度薄、视角广、反应速度快等特点，从而具有可挠曲显示的天然优势。面对柔性OLED的竞争，传统的液晶显示技术也逐渐采用柔性衬底往柔性、曲面等方向进行突破，由此可见，柔性、曲面显示的时代即将来临。
目前，显示屏的上border（边框）、左border、右border均压缩至极窄的边框足以满足全面屏的需求；但是，在下border处，由于需要做数据线扇区（Data line Fanout）以及与外围电路连接的绑定区（bonding），使得下boder进一步压缩成为当前急需解决的技术问题。
与此同时，液晶显示器采用侧入式入光的技术方案，其LED lightbar（灯条）位于显示屏的下border处，LED灯条存在一定的厚度，同时由于LED作为点光源，需要通过导光板的散光作用将光线均匀扩散从而避免近光处的hotspot（热区）现象，因此需要混光距离，混光距离的压缩通常会伴随着背光效率的急剧衰减，使得液晶模组的背光下边框存在一定的极限值。因此，液晶显示屏的下 boder尺寸大小成为实现全面屏（极致窄边框）的关键因素。
【发明内容】
本申请提供一种背光模组及显示装置，能够解决现有液晶显示装置中背光模组因lightbar宽度与混光距离导致下边框过宽的技术问题。
为解决上述技术问题，本申请采用的一个技术方案是：提供一种背光模组，所述背光模组包括柔性基板、发光二极管、荧光膜、扩散膜以及增亮膜；其中，所述柔性基板包括驱动电路，设置于所述柔性基板的非背光区，所述柔性基板的一侧沿所述非背光区延伸并弯折至所述柔性基板背光区的下方，所述发光二极管阵列排布于所述柔性基板的所述背光区，所述荧光膜、所述扩散膜以及所述增亮膜依次形成于所述发光二极管上方，其中，述发光二极管的尺寸为100-1000μm，所述柔性基板的厚度范围为0.02-0.2mm。
为解决上述技术问题，本申请采用的另一个技术方案是：提供一种背光模组，所述背光模组包括柔性基板、发光二极管、荧光膜、扩散膜以及增亮膜；其中，所述柔性基板包括驱动电路，设置于所述柔性基板的非背光区，所述柔性基板的一侧沿所述非背光区延伸并弯折至所述柔性基板背光区的下方，所述发光二极管阵列排布于所述柔性基板的所述背光区，所述荧光膜、所述扩散膜以及所述增亮膜依次形成于所述发光二极管上方。
为解决上述技术问题，本申请采用的又一个技术方案是：提供一种显示装置，所述显示装置包括显示模组背光模组，所述背光模组和所述显示模组相对设置；其中，所述显示模组包括第一基板、第二基板以及夹持于所述第一基板和所述第二基板之间的液晶层；所述显示模组包括显示区及非显示区，所述第二基板至少一侧沿所述非显示区延伸并弯折至所述背光模组的下方，以包覆至少部分所述背光模组，所述背光模组包括柔性基板、发光二极管、荧光膜、扩散膜以及增亮膜；其中，所述柔性基板包括驱动电路，设置于所述柔性基板的非背光区，所述柔性基板的一侧沿所述非背光区延伸并弯折至所述柔性基板背光区的下方，所述发光二极管阵列排布于所述柔性基板的所述背光区，所述荧光膜、所述扩散膜以及所述增亮膜依次形成于所述发光二极管上方。
本申请的有益效果是：提供一中背光模组及显示装置，通过将发光二极管采用密集排布阵列，可有效压缩发光二极管的混光距离，同时将柔性基板的非背光区的一侧弯折至背光区的下方，降低了背光模组下边框宽度，从而可以实现全面屏。
【附图说明】
图1是本申请背光模组第一实施例的结构示意图；
图2是本申请背光模组中柔性基板一实施方式的结构示意图；
图3是本申请背光模组第一实施例的结构示意图;
图4是本申请显示装置一实施方式的结构示意图。
【具体实施方式】
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
请一并参阅图1和图2，图1为本申请背光模组第一实施方式的结构示意图，图2是本申请背光模组中柔性基板的结构示意图。如图1所示，本申请中的背光模组10包括：柔性基板11、发光二极管12、荧光膜13、扩散膜14以及增亮膜15。
其中，本申请中所采用的柔性基板11其材质可以采用无色聚酰亚胺（PI）、聚碳酸酯（PC）、聚降冰片烯（PNB）以及聚对苯二甲酸乙二醇酯（PET）中的一种。本实施例中，采用聚酰亚胺作为柔性基板11。
可选地，该柔性基板11包括背光区A及非背光区B，其中，非背光区B沿柔性基板11的一侧延伸并弯折至柔性基板11背光区A的下方。在具体实施方式中，该柔性基板11还包括驱动电路（图未示），该驱动电路设置于柔性基板11的非背光区B。其中，发光二极管12阵列排布于柔性基板11的背光区A，荧光膜13、扩散膜14以及增亮膜15依次形成于发光二极管12上方，从而制成背光模组10。
本实施中的背光模组10通过直下式背光，将发光二极管12阵列排布于柔性基板11的背光区A，同时将非背光区B的驱动电路弯折至柔性基板11背光区的下方。且本实施例中，通过将柔性基板11的一侧弯折至背光区A的下方，可以减小该背光模组10的下边框的宽度，且在与显示模组进行对组后，还可以降低显示装置的下边框宽度，从而可以实现全面屏显示。
参阅图2，柔性基板11包括第一导线层101和第二导线层102，第一导线层101与第二导线层103电连接，其中第一导线层101连接驱动电路，第二导线层102连接发光二极管。其中，柔性基板11为膜材堆叠结构，该柔性基板11的厚度范围为0.02-0.2mm，进一步的，柔性基板11的厚度范围为0.05-0.18mm，还可以具体为0.11mm、0.15mm等等，此处不做进一步限定。在具体的制备工艺中，当显示面板的液晶模组组装后，对显示面板下边框的柔性基板11进行弯曲（即对应柔性基板11的非背光区B），并弯折至该柔性基板11背光区A下方。
本实施例中，柔性基板11至少包括第一导线层101、第二导线层102、绝缘层103以及柔性衬底104，绝缘层103设置在第一导线层101和第二导线层102之间，第一导线层101和第二导线层102通过绝缘层103的通孔进行电连接；而第一导线层101设置在柔性基板11的内部，第二导线层102设置在柔性基板11的外部，且朝向发光二极管12。而其他实施例中，还可以包括多层导线层，实现不同层之间的电连接关系，再或者也不包括柔性衬底。
进一步的，第二导线层102包括与发光二极管12一一对应的阳极绑定垫和阴极绑定垫，发光二极管12通过一一对应的阳极绑定垫与阴极绑定垫与第二导线层102电连接，再通过第一导线层101从而电连接至驱动电路，实现驱动电路控制发光二极管12的开关。
其中，本实施例中的发光二极管12可以采用蓝光mini-LED，以阵列形式排布于柔性基板11上。其中，发光二极管12与柔性基板11上的阳极绑定垫和阴极绑定垫通过锡膏、银胶、异方性导电胶膜ACF等其他导电绑定方式进行绑定，从而实现发光二极管12一一固定并与驱动电路导通，且具体还可以采用典型的COB(chip on board)工艺制备，在此不作赘述。
当发光二极管12为蓝光发光二极管时，相应的该荧光膜13为黄色荧光膜，在蓝光发光二极管发出蓝光的作用下激发黄光，与未激发荧光膜的蓝光混合得到白光。进一步，该荧光膜13以膜层结构堆叠于蓝光LED的四周与上方。
本实施例中，发光二极管12的尺寸可以为100-1000μm，具体可以为100μm、550μm、1000μm等等。相邻发光二极管的间距可以为100-2000μm，具体可以为100μm、1050μm、2000μm等等，此处不做进一步限定。因发光二极管12的采用密集排布阵列，可有效压缩mini-LED的混光距离，使得背光模组10的混光距离小于1000μm，与现有小尺寸侧入式LCD的背光模组厚度差异较小，不影响现有移动设备的轻薄要求。
此外，在其它实施例中，该发光二极管12还可以为紫外发光二极管，此时相应的该荧光膜13可以为至少为两种颜色的荧光粉混合而成，具体可以为红绿蓝三基色荧光粉混合而成，在紫外发光二极管发出紫外光的作用下混合得到白光。当然，该荧光膜13还可以为两种互为补色的荧光粉混合而成，例如黄色+蓝色荧光粉、品红+绿色荧光粉、红色+青色荧光粉与硅胶混合，在紫外光的作用下激发合成白光。
更进一步，发光二极管12可以为三原色的发光二级管，此时该三原色发光二级光发出的光可以直接混合得到白光，也就是说此种技术方案中可以不需要荧光膜13，如图3所示，图3为本申请中背光模组第二实施方式的结构示意图。
扩散膜14在背光模组中主要起到修正扩散角度的作用，会使光辐射面积增大。发光二极管12的发光光源经扩散膜14扩散之后，能变成面积更大，均匀度较好，色度稳定的2次光源。其中，扩散膜14的基本结构是在透明基材上如PET两面涂光学散光颗粒，其制备方法及过程可以参照现有技术中制备显示面板的方法及工艺，此处本申请不做限定。由于经过扩散膜14的光源降低了单位面积的光强度，不能满足显示面板的亮度要求，从而需要增加亮度的薄膜，即增亮膜15。其中，棱镜膜是当今使用最广泛的增亮产品，因此棱镜膜是增亮膜15的一种，棱镜膜是一层透明的塑料薄膜，厚度在50到300微米之间，在薄膜的上表面均匀而整齐的覆盖着一层棱镜结构；棱镜膜放置在背光模组的扩散膜14和液晶模组之间，它的作用是改善光的角分布，它可以将从扩散膜14射出的均匀地向各个角度发散的光汇聚到轴向角度上，即正视角度上，在不增加出射总光通量的情况下提高轴向亮度。
上述实施方式中，通过将发光二极管采用密集排布阵列，可有效压缩发光二极管的混光距离，且采用直下式入光设计方案，使得背光模组的上、下、左、右具有相等的边框宽度，边框宽度仅受限于胶框宽度、膜片堆叠公差等，使得背光模组的下边框达到侧入式背光模板的左右边框的水平，即下边框的宽度可以降低至0.5-1mm，从而实现极致窄边框的背光模组。
请参阅图3，图3是本申请显示装置一实施方式的结构示意图。如图3所示，该显示装置20包括显示模组30以及上述任一所述的背光模组C，该背光模组C和显示模组30相对设置，其中，该背光模组C的具体结构及可以详见上述实施例的具体描述，此处不再赘述。
可选地，本申请中的显示模组30还可以进一步包括第一基板31、第二基板32以及夹持于第一基板31和第二基板32之间的液晶层D。其中，第一基板31可以为彩膜基板，第二基板32可以为阵列基板。当然在其它实施例中，第一基板31也可以为阵列基板，第二基板32可以为彩膜基板，此处不做进一步限定。
本实施例中的第二基板32为阵列基板（Array），通过设置薄膜晶体管（TFT）器件阵列驱动液晶层D的偏转。其中，第二基板32为柔性基板，其材质可以采用无色聚酰亚胺（PI）、聚碳酸酯（PC）、聚降冰片烯（PNB）以及聚对苯二甲酸乙二醇酯（PET）中的一种。本实施例中采用采用聚酰亚胺。
可选地，第二基板32可以包括数据线的扇出区（Data line Fanout）、驱动电路绑定区（IC bonding）以及柔性电路板绑定区（FPC bonding）。且其制程与传统LCD结构相同，仅用耐低温（300-400℃）的无色PI替代传统的玻璃基底，因而在Array工艺段需要采用低温兼容工艺进行匹配。
进一步，该显示模组30包括显示区及非显示区，该第二基板32至少一侧沿所述非显示区延伸并弯折至背光模组C的下方，以包覆背光模组C的一侧。具体来说，在该显示模组30与背光模组C对组后，对该显示模组30的下边框区（第二基板32的一侧）进行弯曲并弯折至背光模组C的背光区下方，并采用背胶进行固定，从而将显示模组30下边框区的扇出区、驱动电路绑定区弯折至背光模组10的背面，从视觉上降低了正面下边框区的宽度，可以实现全面屏显示效果。
在本实施例中，背光模组C的厚度约为1mm，第二基板32通过弯折与背光模组C中的柔性基板固定。相应地，该第二基板32的弯折半径约为背光模组C厚度的一半，且具备较大的曲率半径，避免该第二基板32在弯折处出现断裂等所导致的电性失常问题。此外，该第二基板32的弯折半径的存在不可避免地增加了显示模组下边框的厚度（弯折区的边框宽度需要整机容纳空间），但是背光模组C中mini-LED背光设计的低厚度特性保证了较小的边框损失，有利于达成窄边框显示面板的设计。
此外，本申请中的显示模组30还包括第一偏光片33及第二偏光片34。其中，第一偏光片33设置于第一基板31的远离液晶层D的表面，第二偏光片34设置于第二基板32的远离液晶层D的表面。其中第一偏光片33及第二偏光片34、第一基板31以及液晶层D为常规结构，此处不做特殊限定。即在作为硬屏（相对于柔性显示）显示时，采用与现有硬屏设计相同的材料，即第一基板31仍然采用与现有液晶显示工艺相兼容的玻璃基板，第一偏光片33及第二偏光片34与液晶盒内设计也无需考量可挠性信赖性设计。当然也不排除采用该结构用于柔性显示，此时除第二基板32外，其余结构也需做同步柔性设计。
本申请所提供的显示装置20可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
上述实施方式，通过将背光模组中的柔性基板的非背光区的驱动电路弯折至背光区的下方，可以减小背光模组的下边框宽度，同时将和显示模组对组时，将显示模组的第二基板的非显示区（包括扇出区、驱动绑定区、柔性电路绑定区）弯折至背光模组的下方包覆背光模组的一侧，可以减小显示装置的下边框宽度，及采用窄边框的背光模组和窄边框的显示模组，可以实现全面屏的显示效果。
综上所述，本领域技术人员容易理解，本申请提供一种显示面板及显示装置，通过将背光模组中的柔性基板的非背光区的驱动电路弯折至背光区的下方，可以减小背光模组的下边框宽度，同时将和显示模组对组时，将显示模组的第二基板的非显示区（包括扇出区、驱动绑定区、柔性电路绑定区）弯折至背光模组的下方包覆背光模组的一侧，可以减小显示装置的下边框宽度，及采用窄边框的背光模组和窄边框的显示模组，可以实现全面屏的显示效果。
以上所述仅为本申请的实施方式，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。

Claims (18)

  1. 一种背光模组，其中，所述背光模组包括柔性基板、发光二极管、荧光膜、扩散膜以及增亮膜；
    其中，所述柔性基板包括驱动电路，设置于所述柔性基板的非背光区，所述柔性基板的一侧沿所述非背光区延伸并弯折至所述柔性基板背光区的下方，所述发光二极管阵列排布于所述柔性基板的所述背光区，所述荧光膜、所述扩散膜以及所述增亮膜依次形成于所述发光二极管上方，其中，述发光二极管的尺寸为100-1000μm，所述柔性基板的厚度范围为0.02-0.2mm。
  2. 根据权利要求1所述的背光模组，其中，相邻所述发光二极管之间的间距范围为100-2000μm。
  3. 根据权利要求1所述的背光模组，其中，所述柔性基板包括第一导线层和第二导线层，所述第一导线层与所述第二导线层电连接，其中所述第一导线层连接所述驱动电路，所述第二导线层连接所述发光二极管。
  4. 根据权利要求3所述的背光模组，其中，所述第二导线层包括与所述发光二极管一一对应的阳极绑定垫和阴极绑定垫。
  5. 一种背光模组，其中，所述背光模组包括柔性基板、发光二极管、荧光膜、扩散膜以及增亮膜；
    其中，所述柔性基板包括驱动电路，设置于所述柔性基板的非背光区，所述柔性基板的一侧沿所述非背光区延伸并弯折至所述柔性基板背光区的下方，所述发光二极管阵列排布于所述柔性基板的所述背光区，所述荧光膜、所述扩散膜以及所述增亮膜依次形成于所述发光二极管上方。
  6. 根据权利要求5所述的背光模组，其中，所述发光二极管的尺寸为100-1000μm。
  7. 根据权利要求6所述的背光模组，其中，相邻所述发光二极管之间的间距范围为100-2000μm。
  8. 根据权利要求5所述的背光模组，其中，所述柔性基板的厚度范围为0.02-0.2mm。
  9. 根据权利要求5所述的背光模组，其中，所述柔性基板包括第一导线层和第二导线层，所述第一导线层与所述第二导线层电连接，其中所述第一导线层连接所述驱动电路，所述第二导线层连接所述发光二极管。
  10. 根据权利要求8所述的背光模组，其中，所述第二导线层包括与所述发光二极管一一对应的阳极绑定垫和阴极绑定垫。
  11. 一种显示装置，其中，所述显示装置包括显示模组及背光模组，所述背光模组和所述显示模组相对设置；
    其中，所述显示模组包括第一基板、第二基板以及夹持于所述第一基板和所述第二基板之间的液晶层；所述显示模组包括显示区及非显示区，所述第二基板至少一侧沿所述非显示区延伸并弯折至所述背光模组的下方，以包覆至少部分所述背光模组；
    所述背光模组包括柔性基板、发光二极管、荧光膜、扩散膜以及增亮膜；其中，所述柔性基板包括驱动电路，设置于所述柔性基板的非背光区，所述柔性基板的一侧沿所述非背光区延伸并弯折至所述柔性基板背光区的下方，所述发光二极管阵列排布于所述柔性基板的所述背光区，所述荧光膜、所述扩散膜以及所述增亮膜依次形成于所述发光二极管上方。
  12. 根据权利要求11所述的显示装置，其中，所述第二基板的弯折半径为所述背光模组厚度的一半。
  13. 根据权利要求11所述的显示装置，其中，所述显示模组还包括第一偏光片及第二偏光片，其中，所述第一偏光片设置于所述第一基板的远离所述液晶层的表面，所述第二偏光片设置于所述第二基板的远离所述液晶层的表面。
  14. 根据权利要求11所述的显示装置，其中，所述第二基板为柔性基板。
  15. 根据权利要求11所述的显示装置，其中，所述发光二极管的尺寸为100-1000μm。
  16. 根据权利要求15所述的显示装置，其中，相邻所述发光二极管之间的间距范围为100-2000μm。
  17. 根据权利要求11所述的显示装置，其中，所述柔性基板包括第一导线层和第二导线层，所述第一导线层与所述第二导线层电连接，其中所述第一导线层连接所述驱动电路，所述第二导线层连接所述发光二极管。
  18. 根据权利要求11所述的显示装置，其中，所述第二导线层包括与所述发光二极管一一对应的阳极绑定垫和阴极绑定垫。
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