WO2024055395A1 - 导光组件可被胶黏的背光模组与显示装置 - Google Patents

导光组件可被胶黏的背光模组与显示装置 Download PDF

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Publication number
WO2024055395A1
WO2024055395A1 PCT/CN2022/129241 CN2022129241W WO2024055395A1 WO 2024055395 A1 WO2024055395 A1 WO 2024055395A1 CN 2022129241 W CN2022129241 W CN 2022129241W WO 2024055395 A1 WO2024055395 A1 WO 2024055395A1
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Prior art keywords
light guide
light
glue layer
backlight module
guide element
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PCT/CN2022/129241
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English (en)
French (fr)
Inventor
萧士晟
黄哲辉
黄惠瑜
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瑞仪光电(南京)有限公司
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Publication of WO2024055395A1 publication Critical patent/WO2024055395A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • 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

Definitions

  • the present invention relates to a backlight module in which a light guide component can be glued and a display device including the backlight module, and in particular, to a backlight module applicable to a display device.
  • a general LCD display mainly includes a backlight module and an LCD panel.
  • the backlight module is provided with a light guide plate that uniformly guides the light from the light-emitting unit to all parts of the liquid crystal display panel.
  • the bottom of the light guide plate is provided with light guide plate fixing glue.
  • the fixing glue of the light guide plate is a transparent colloid and is combined with the reflective sheet to form a composite structure.
  • the main function of the light guide plate fixing glue is to fix the light guide plate close to the light source.
  • the light guide plate fixing glue can ensure the alignment height of the light guide plate and the light source, or ensure that the light guide plate and the light source maintain a fixed distance in the plane direction to maintain light utilization efficiency, and can also adapt to the narrow module design. Borders trend.
  • the light guide plate fixing glue itself is transparent or translucent, part of the light from the light-emitting unit is easily exported through the light guide plate fixing glue body and out at its end.
  • bright bands and hotspots are prone to appear near the frame of the LCD panel. ), which in turn affects the visual beauty of the LCD panel screen.
  • a wider frame must be used to cover the aforementioned bright bands or hot spots, making it difficult to design a narrow frame for an LCD panel.
  • an object of the present invention is to provide a backlight module that can suppress the occurrence of bright bands and/or hot spots, and a display device including the backlight module.
  • the backlight module includes a carrier, a light guide element, a light-emitting unit and a gel unit.
  • the bearing member has an accommodation space.
  • the light guide element is accommodated in the accommodation space and has a light incident surface.
  • the light-emitting unit is arranged on a side close to the light incident surface.
  • the colloid unit is disposed between the light guide element and the carrier, and includes a first glue layer, a second glue layer and a reflective structure.
  • the first adhesive layer is attached to the light guide element. At least a portion of the reflective structure is disposed between the first glue layer and the second glue layer.
  • the penetration rate of the first glue layer is smaller than the penetration rate of the second glue layer.
  • the second adhesive layer is attached to the bearing member.
  • the light guide element has a reflective surface connected to the light incident surface.
  • the backlight module also contains a main reflector.
  • the main reflective sheet and the colloid unit are arranged between the reflective surface and the carrier, and the colloidal unit is closer to the light-emitting unit than the main reflective sheet.
  • the reflective structure is a part of the main reflective sheet extending toward the light-emitting unit.
  • the light-emitting unit further includes a plurality of light-emitting elements and a circuit board.
  • the light-emitting element is arranged on the circuit board.
  • a part of the circuit board extends between the carrier and the light guide plate, and the second adhesive layer is attached to the circuit board.
  • the penetration rate of the first adhesive layer is no less than 40% and no more than 85%.
  • the thickness of the first glue layer is greater than the thickness of the second glue layer.
  • the first glue layer includes coloring material.
  • the display device includes the backlight module and the display panel as mentioned above.
  • the display panel is arranged above the backlight module.
  • the backlight module further includes a front frame.
  • the front frame is disposed between the light guide element and the display panel to carry the display panel.
  • the present invention eliminates the light-guiding function of the first adhesive layer by reducing the transmittance of the first adhesive layer. In this way, the conventional bright band and/or hot spot problems that occur in display panels can be improved, thereby making the display device have better optical quality, and also achieving the purpose of narrowing the frame of the display device.
  • the present invention can also choose to add coloring matter into the first glue layer to adjust the composition of the first glue layer, so as to achieve the purpose of making the penetration rate of the first glue layer smaller than the penetration rate of the second glue layer.
  • the present invention can also achieve the purpose of enhancing the adhesion of the first glue layer by adjusting the thickness of the first glue layer to be greater than the thickness of the second glue layer.
  • 1A is a top view schematic diagram of a backlight module in which the light guide assembly can be glued according to the first embodiment of the present invention.
  • Figure 1B is a schematic partial cross-sectional view taken along the A-A' section line of Figure 1A;
  • FIG. 2 is a line graph illustrating the transmittance of the first adhesive layer versus the degree of hot spots according to the first embodiment of the present invention
  • Fig. 3 is a schematic partial cross-sectional view illustrating a variant embodiment according to the first embodiment of the present invention
  • Figure 4 is a schematic partial cross-sectional view illustrating another variant embodiment according to the first embodiment of the present invention.
  • FIG. 5 is a schematic partial cross-sectional view taken along the A-A' section line of FIG. 1A according to the second embodiment of the present invention.
  • FIG. 1A is a top view diagram of a backlight module in which the light guide assembly can be glued according to the first embodiment of the present invention.
  • Figure 1B is a schematic partial cross-sectional view taken along the A-A' section line of Figure 1A.
  • the Z direction in FIG. 1B is the normal direction of the light exit surface 210 of the display panel 200 , or can also be regarded as the stacking direction of the light guide element 120 on the colloid unit 150 .
  • the X direction and the Y direction in FIG. 1A are respectively parallel to the light exit surface 122 of the light guide element 120, and the X direction is perpendicular to the Y direction.
  • the backlight module 100 includes a carrier 110, a light guide element 120, a light emitting unit 130 and a colloid unit 150.
  • the bearing member 110 has a receiving space 113 .
  • the light guide element 120 is accommodated in the accommodation space 113 and has a light incident surface 121 .
  • the light-emitting unit 130 is disposed on a side close to the light incident surface 121 .
  • the glue unit 150 is disposed between the light guide element 120 and the carrier 110, and includes a first glue layer 151, a second glue layer 152 and a reflective structure 153.
  • the first adhesive layer 151 is attached to the light guide element 120 .
  • At least a part of the reflective structure 153 is disposed between the first glue layer 151 and the second glue layer 152 .
  • the penetration rate of the first glue layer 151 is smaller than the penetration rate of the second glue layer 152 .
  • the present invention can eliminate the light-guiding function of the first glue layer 151, thereby not only achieving the design purpose of narrow bezels, but also Taking into account the optical taste of the overall light-emitting surface, for example: reducing bright bands, hotspots or unevenness on the light-emitting surface.
  • the display device 10 of this embodiment includes a backlight module 100 and a display panel 200 .
  • the display panel 200 is disposed above the backlight module 100 and can be combined with the backlight module 100 to provide a backlight source for the display panel 200 of the display device 10 .
  • the backlight module 100 mainly includes a carrier 110 , a light guide element 120 , one or more light emitting units 130 , a front frame 140 and a gel unit 150 .
  • the light guide element 120 can be combined with the carrier 110 through the colloid unit 150 .
  • the carrier 110 has an accommodating space 113, so that the accommodating space 113 of the carrier 110 can accommodate the light guide element 120, the light emitting unit 130 and the colloid unit 150 in sequence.
  • the carrier 110 includes a first part 111 and a second part 112 .
  • the plurality of first parts 111 substantially vertically surrounds the second part 112 to define the accommodation space 113 .
  • the number of the first parts 111 is four, and they are respectively arranged on four sides of the second part 112 .
  • the first part 111 and the second part 112 of the carrier 110 may together form a rectangular open box. This exemplary example is used to illustrate but not to limit the present invention.
  • the light guide element 120 is disposed between the second part 112 of the carrier 110 and the front frame 140 and is accommodated in the accommodating space 113 .
  • the light guide element 120 has a light incident surface 121 adjacent to the light emitting unit 130 and a light exit surface 122 adjacent to the display panel 200 .
  • the light 131 from the light-emitting unit 130 enters the light guide element 120 from the light incident surface 121, and after being reflected multiple times in the light guide element 120, leaves the light guide element 120 from the light exit surface 122 and then enters the display panel 200.
  • the light guide element 120 may be a light guide plate (LGP) or a light guide film (LGF) used in the backlight module 100.
  • the shape of the light guide element 120 may roughly correspond to the shape of the accommodating space 113 and be accommodated in the accommodating space 113 .
  • Each light-emitting unit 130 is disposed on a side close to the light incident surface 121 of the light guide element 120, between the first part 111 of the carrier 110 and the light guide element 120, and is accommodated in the accommodating space 113.
  • the light-emitting unit 130 also includes a plurality of light-emitting elements 132 and a circuit board 133.
  • the light-emitting elements 132 are disposed on the circuit board 133, and the light-emitting elements 132 are electrically connected to the circuit board 133.
  • the light-emitting unit 130 and the light-incident surface 121 of the light guide element 120 can be separated by an appropriate distance to form an air gap 114, so that the light 131 from the light-emitting unit 130 can first pass through the air gap 114, and then pass through the air gap 114.
  • the light surface 121 enters the light guide element 120 .
  • the light emitting unit 130 may be connected to the first part 111 of the carrier 110 or to the front frame 140, but is not limited thereto.
  • the light emitting unit 130 may be an organic light emitting diode, an inorganic light emitting diode, or a combination thereof.
  • the light-emitting unit 130 can provide monochromatic light or white light 131 to the display panel 200 .
  • the type of the light emitting unit 130 in this embodiment is not intended to limit the present invention.
  • the light-emitting unit 130 can also be made of other different light-emitting materials.
  • the front frame 140 is disposed between the light guide element 120 and the display panel 200 to carry the display panel 200 .
  • the front frame 140 is disposed above the light guide element 120 and covers the light emitting unit 130 and the air gap 114, thereby preventing the light 131 from the light emitting unit 130 from directly entering the display panel 200 through the air gap 114 before entering the light guide element 112. .
  • the front frame 140 also covers a part of the light guide element 120 .
  • the front frame 140 horizontally connects the top surface 111A of the first part 111 of the carrier 110 in the opposite direction extending along the light guide element 120 on the XY plane, so that the front frame 140 and the first part 111 of the carrier 110 cover the light emitting unit 130 .
  • the front frame 140 may be connected to a side surface of the light emitting unit 130 parallel to a direction in which the light guide element 120 extends.
  • the colloid unit 150 is disposed between the light guide element 120 and the carrier 110.
  • the colloid unit 150 is used to connect to the second part 112 of the carrier 110 and the light guide element 120 respectively. Thereby, the purpose of fixing the light guide element 120 on the second part 112 of the carrier 110 via the glue unit 150 can be achieved. Therefore, the colloid unit 150 can also be regarded as being sandwiched between the light guide element 120 and the second part 112 of the carrier 110 .
  • the colloid unit 150 includes a laminate structure composed of multiple material layers.
  • the glue unit 150 at least includes a first glue layer 151, a second glue layer 152 and a reflective structure 153.
  • the first adhesive layer 151 or the second adhesive layer 152 may be adhesive used to adhere the reflective sheet or the printed circuit board (PCB) respectively, such as optically clear adhesive (Optically Clear Adhesive, OCA).
  • OCA Optically Clear Adhesive
  • the second glue layer 152 is attached to the second part 112 of the carrier 110 to use the glue unit 150 to fix the light guide element 120 on the carrier 110 so that the second glue layer 152 is sandwiched between the reflective structure and 153 and the second part 112 of the carrier 110, the light guide element 120 is fixed on the carrier 110 through the second glue layer 152, thereby achieving the effect of fixing the light guide element 120.
  • at least a part of the reflective structure 153 is disposed between the first glue layer 151 and the second glue layer 152 to reflect light.
  • the reflective structure 153 is a light reflective material sandwiched entirely between the first glue layer 151 and the second glue layer 152 to form a stacked structure of the colloid unit 150 .
  • the colloid unit 150 is disposed adjacent to the light-emitting unit 130 and between the light guide element 120 and the carrier 110 . In this way, the light entering the light guide element 112 is reflected by the reflective structure 153, and the brightness of the light exit surface adjacent to the light incident surface can be maintained.
  • the penetration rate of the first glue layer 151 is smaller than the penetration rate 152 of the second glue layer. In this way, the amount of light 131 from the light-emitting unit 130 passing through the light incident surface 151A of the first adhesive layer 151 close to the light-emitting unit 130 and entering the first adhesive layer 151 can be reduced, thereby reducing the proximity of the light guide element 120 to the front frame 140
  • the purpose is to produce bright bands and hot spots at the locations.
  • the penetration rate of the first glue layer 151 ⁇ 85%.
  • the transmittance of the first glue layer 151 is lower than 40%, the adhesion of the first glue layer 151 will be reduced, which is detrimental to the ability of the first glue layer 151 to fix the light guide element 120.
  • the transmittance is higher than 85%, the problem of uneven light emission in bright bands and hot spots is likely to occur.
  • FIG. 2 is a line graph illustrating the transmittance of the first adhesive layer 151 versus the degree of hot spots according to the first embodiment of the present invention.
  • the horizontal axis in Figure 2 is the penetration rate percentage (%), and the vertical axis is the hot spot degree evaluation value. It can be seen from FIG. 2 that when the transmittance of the first adhesive layer 151 is greater than 85%, the hot spot degree evaluation value will exceed a predetermined value, making the display panel 200 prone to the conventional bright band and hot spot 201 problems.
  • the first glue layer 151 is an optical glue containing colorants, and the colorants are colorants used for low light transmittance. In some examples, the colorant is white. In this way, any of the foregoing methods can achieve the purpose of reducing the penetration rate of the first glue layer 151 to a range of no more than 85% and no less than 40%. It should be noted that the material and color of the first glue layer 151 in this embodiment are not intended to limit the present invention. In other embodiments, the optical glue of the first glue layer 151 can also be mixed using diffusion particles to obtain a first glue layer with lower transmittance.
  • the thickness of the first adhesive layer 151 is greater than the thickness of the second adhesive layer 152, so as to increase the adhesion strength between the first adhesive layer 151 and the light guide element 120.
  • the adhesion strength between the pigment or particles can be increased by increasing the thickness of the first adhesive layer 151, thereby ensuring the adhesion strength between the first adhesive layer 151 and the light guide element 120.
  • the backlight module 100 further includes a main reflective sheet 160 .
  • the main reflection sheet 160 is accommodated in the accommodation space 113 and extends along the direction in which the light guide element 120 extends.
  • the main reflective sheet 160 is different from the reflective structure 153, that is to say, the main reflective sheet 160 and the reflective structure 153 are not connected to each other, so that the main reflective sheet 160 and the reflective structure 153 do not need to be installed at one time, which is helpful. Convenience in assembling the backlight module 100.
  • the light guide element 120 in this modified embodiment has a reflective surface 123 connected to the light incident surface 121, so that the first adhesive layer 151 is attached to a part of the reflective surface 123 of the light guide element 120.
  • the main reflective sheet 160 and the colloid unit 150 are independently disposed between the reflective surface 123 and the carrier 110 .
  • the colloid unit 150 is closer to the light-emitting unit 130 than the main reflective sheet 160 .
  • the reflective structure 153 is generally disposed between the first glue layer 151 and the second glue layer 152 , so that the first glue layer 151 , the second glue layer 152 and the reflective structure 153 have shapes and sizes that generally correspond to each other.
  • the circuit board 133 of the light-emitting unit 130 can be arranged to replace part of the first part 111 of the carrier 110 to surround the accommodation space 113, so that the circuit board 133 is connected to the front frame 140 and the second part of the carrier 110 in the Z direction. Part 112 of the edge.
  • the backlight module 100 also includes a main reflective sheet 160 .
  • the main reflection sheet 160 is accommodated in the accommodation space 113 and extends along the direction in which the light guide element 120 extends.
  • the reflective structure 153 is a part of the main reflective sheet 160 , that is to say, the main reflective sheet 160 and the reflective structure 153 are connected to each other.
  • the reflective structure 153 is a part of the main reflective sheet 160 that extends toward the light-emitting unit 130 to ensure uniformity of reflected light and achieve better light uniformity.
  • FIG. 5 is a schematic partial cross-sectional view taken along the A-A’ section line of FIG. 1A according to the second embodiment of the present invention.
  • the Y direction and the Z direction in FIG. 5 correspond to the Y direction and the Z direction shown in FIG. 1B respectively.
  • the circuit board 133 is arranged parallel to the light guide element 120, so that a part of the circuit board 133 extends between the carrier 110 and the light emitting element 132, and the other part of the circuit board 133 extends between the carrier 110 and the light guide. between the components 120 and fixed on the carrier 110 .
  • the first glue layer 151 of the glue unit 150 is attached to the light guide element 120, and the second glue layer 152 is attached to the circuit board 133, so that the circuit board 133 is sandwiched between the second glue layer 152 and the carrier 110. between them, and are relatively fixed on the light guide element 120 and the carrier 110 .
  • the number of first parts, the shape of the second part, the shape of the light guide element, the type of the light-emitting unit, the number of the light-emitting unit, the color of the light, the material of the colloid unit, the main The material of the reflective sheet, the thickness of the first glue layer, or the thickness of the second glue layer are only used for illustration and are not intended to limit the present invention. In other embodiments, the shape, number, material, or thickness of the above-mentioned components can be changed according to requirements.
  • the reflective structure and the main reflective sheet may or may not be connected.
  • the connected reflective structure and the main reflective sheet can be formed into an integrated structure, and its shape can be designed to match the shape of the accommodation space.
  • the present invention uses a colloid unit to fix the light guide element to the carrier.
  • the first glue layer is attached to the reflective surface and reflective structure of the light guide element
  • the second glue layer is attached to the carrier. and a reflective structure
  • the first adhesive layer has the characteristics of lower transmittance, thereby reducing the amount of light passing through the light guide element through the first adhesive layer, thereby not only achieving the design purpose of a narrow frame, but also taking into account the overall light-emitting surface
  • Optical taste for example, can reduce the occurrence of bright bands, hot spots or unevenness in the light-emitting area of the light guide element close to the light incident surface.
  • the penetration rate of the first adhesive layer is not greater than 85%.
  • the penetration rate of the first glue layer may range from 40% to 85%, inclusive. If the penetration rate of the first adhesive layer is less than 40%, it is easy to cause poor adhesion. If the penetration rate of the first adhesive layer exceeds 85%, the conventional problems of bright bands and hot spots will easily become obvious, and the impact will be Displays the overall visual look and feel of the device.
  • the transmittance of the first adhesive layer is lower than the transmittance of the second adhesive layer, thereby reducing the problems of bright bands and hot spots in the conventional backlight module.
  • the penetration rate of the first glue layer is smaller than the penetration rate of the second glue layer.
  • colorants can be added to the first glue layer to adjust the composition of the first glue layer, thereby achieving the purpose of making the transmittance of the first glue layer smaller than the transmittance of the second glue layer, thereby making the display device have Better overall visual look and feel.

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  • Optics & Photonics (AREA)
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Abstract

一种导光组件可被胶黏的背光模组（100），包含承载件（110）、导光元件（120）、发光单元（130）以及胶体单元（150），承载件（110）具有容置空间（113），导光元件（120）容置于容置空间（113）中，且具有入光面（121），发光单元（130）设置于靠近入光面（121）的一侧，胶体单元（150）设置在导光元件（120）与承载件（110）之间，并包含第一胶层（151）、第二胶层（152）及反射结构（153），第一胶层（151）贴附于导光元件（120），反射结构（153）的至少一部分设置在第一胶层（151）与第二胶层（152）之间，第一胶层（151）的穿透率小于第二胶层（152）的穿透率。

Description

导光组件可被胶黏的背光模组与显示装置
本申请要求享有于2022年9月14日提交的申请号为202211113228.2、发明名称为“导光组件可被胶黏的背光模组及显示器”的中国专利申请的优先权，在此通过引用将其全部内容结合于本申请中。
技术领域
本发明涉及一种导光组件可被胶黏的背光模组与包含此背光模组的显示装置，且特别是涉及可应用于显示装置的背光模组。
背景技术
一般的液晶显示器主要包含背光模组以及液晶显示面板。背光模组中设有将来自发光单元的光线均匀导向液晶显示面板各处的导光板。导光板底部设有导光板固定胶。导光板固定胶为透明胶体，并搭配反射片而形成复合结构。导光板固定胶的主要功能为将导光板固定在靠近光源处。当环境温度变化时，导光板固定胶可以确保导光板与光源的对位高度，或确保导光板与光源在平面的方向上保持固定距离，以维持光利用效率，还能够因应模组设计有窄边框的趋势。
由于导光板固定胶本身为透明或半透明状，来自发光单元的部分光线容易通过导光板固定胶本体而于其末端导出，一方面，液晶显示面板靠近边框的位置容易出现亮带及热点(hotspot)的光学品味问题，进而影响到液晶显示面板画面的视觉美观。另一方面，因为亮带及热点的存在，必须利用较宽的边框遮蔽前述亮带或热点，使得液晶显示面板的窄边框设计变得困难。
发明内容
因此，本发明的目的就是提供一种可抑制亮带或/及热点发生的背光 模组与包含此背光模组的显示装置。
根据本发明的上述目的，提出一种背光模组。此背光模组包含承载件、导光元件、发光单元以及胶体单元。承载件具有容置空间。导光元件容置于容置空间中，且具有入光面。发光单元设置于靠近入光面的一侧。胶体单元设置在导光元件与承载件之间，并包含第一胶层、第二胶层及反射结构。第一胶层贴附于导光元件。反射结构的至少一部分设置在第一胶层与第二胶层之间。第一胶层的穿透率小于第二胶层的穿透率。
依据本发明的一实施例，第二胶层贴附于承载件。
依据本发明的另一实施例，导光元件具有连接于入光面的反射面。背光模组还包含主反射片。主反射片与胶体单元设置于反射面与承载件之间，且胶体单元比主反射片更靠近发光单元。
依据本发明的又一实施例，反射结构为主反射片朝发光单元延伸的一部分。
依据本发明的再一实施例，发光单元还包含多个发光元件及电路板。发光元件设于电路板上。电路板的一部分延伸至承载件与导光板之间，且第二胶层贴附于电路板。
依据本发明的再一实施例，第一胶层的穿透率不小于40％且不大于85％。
依据本发明的再一实施例，第一胶层的厚度大于第二胶层的厚度。
依据本发明的再一实施例，第一胶层包含色料。
根据本发明的上述目的，提出一种显示装置。此显示装置包含如前所述的背光模组以及显示面板。显示面板设置于背光模组的上方。
依据本发明的一实施例，背光模组还包含前框。前框设置在导光元件与显示面板之间，以承载显示面板。
由上述可知，本发明藉由降低第一胶层的穿透率，来消弥第一胶层的导光作用。藉此，可改善显示面板所发生的习知亮带或/及热点问题，进而使得显示装置具有较佳的光学品味，也可以达到缩窄显示装置边框的目的。
本发明还可以选择在第一胶层中加入色料来调整第一胶层的成分，以达到第一胶层的穿透率小于第二胶层的穿透率的目的。
另一方面，本发明还可以通过将第一胶层的厚度调整为大于第二胶层的厚度，藉此达到补强第一胶层的黏着性的目的。
附图说明
为了更完整地了解实施例及其优点，现在参照附图做出下列描述，其中：
图1A是绘示依照本发明的第一实施方式的导光组件可被胶黏的背光模组的俯视图标意图。
图1B是绘示沿着图1A的A-A’剖面线所剖切的局部剖面图示意图；
图2是绘示依照本发明的第一实施方式的第一胶层的穿透率对热点程度所得的折线图；
图3是绘示依照本发明的第一实施方式的一种变形实施例的局部剖面图示意图；
图4是绘示依照本发明的第一实施方式的另一种变形实施例的局部剖面图示意图；
图5是绘示依照本发明的第二实施方式沿着图1A的A-A’剖面线剖切的局部剖面图示意图。
具体实施方式
请同时参照图1A及图1B，图1A是绘示依照本发明的第一实施方式的导光组件可被胶黏的背光模组的俯视图标意图。图1B是绘示沿着图1A的A-A’剖面线所剖切的局部剖面图示意图。图1B中的Z方向为显示面板200的出光面210的法线方向，或是也可以视为导光元件120在胶体单元150上的堆叠方向。图1A中的X方向与Y方向分别平行于导光元件120的出光面122，且X方向垂直于Y方向。又，X方向与Y方向分别垂直于图1B中所示的Z方向。根据本发明的一种实施例的背光模组100，包含承载件110、导光元件120、发光单元130以及胶体单元150。承载件110具有容置空间113。导光元件120容置于容置空间113中，且具有入光面121。发光单元130设置于靠近入光面121的一侧。胶体单元150设置在导光元 件120与承载件110之间，并包含第一胶层151、第二胶层152及反射结构153。第一胶层151贴附于导光元件120。反射结构153的至少一部分设置在第一胶层151与第二胶层152之间。第一胶层151的穿透率小于第二胶层152的穿透率。本发明藉由第一胶层151的穿透率小于第二胶层152的穿透率的设计，可消弥第一胶层151的导光作用，藉此不仅达到窄边框的设计目的，并且兼顾整体出光面的光学品味，例如：减少出光面的亮带、热点(hotspot)或不均匀情况。
本实施方式的显示装置10包含背光模组100与显示面板200。显示面板200设置于背光模组100上方，可与背光模组100结合，以提供显示装置10的显示面板200的背光源。如图1A及图1B所示，背光模组100主要包含承载件110、导光元件120、一个或多个发光单元130、前框140以及胶体单元150。通过胶体单元150可将导光元件120结合于承载件110上。在本实施例中，承载件110具有容置空间113，使得承载件110的容置空间113可以依序容置导光元件120、发光单元130以及胶体单元150。
承载件110包含第一部分111与第二部分112。在一实施方式中，多个第一部分111大致垂直地围绕第二部分112来界定容置空间113。例如在一例子中，第一部分111的数量为四个，且分别设置在第二部分112的四个侧边上。在一示范例子中，承载件110的第一部分111及第二部分112可一起构成矩形的开口盒，该示范例子用以示范说明并非用以限制本发明。
导光元件120设置于承载件110的第二部分112及前框140之间，并容置于容置空间113中。导光元件120具有邻近发光单元130的入光面121与邻近显示面板200的出光面122。来自发光单元130的光线131从入光面121进入导光元件120中，并在导光元件120中经过多次反射后，从出光面122离开导光元件120后再进入显示面板200。导光元件120可以是用于背光模组100中的导光板(light guide plate，LGP)或导光膜(light guide film，LGF)。在一示范性的例子中，导光元件120的形状可大致对应于容置空间113的形状，而容置于容置空间113中。
每个发光单元130设置于靠近导光元件120的入光面121的一侧、设置于承载件110的第一部分111与导光元件120之间、并容置于容置空间 113中。发光单元130还包含多个发光元件132及电路板133，例如发光元件132设置于电路板133上，并且发光元件132与电路板133电连接。在一例子中，发光单元130与导光元件120的入光面121之间可以相隔适当的距离，以形成空气间隙114，使得来自发光单元130的光线131可以先经过空气间隙114，再从入光面121进入导光元件120中。在一示范性的例子中，发光单元130可以与承载件110的第一部分111连接，或与前框140连接，但并不以此为限。在一些例子中，发光单元130可为有机发光二极管、无机发光二极管或其组合。藉此，发光单元130可向显示面板200提供单色光或是白光的光线131。要说明的是，本实施方式的发光单元130的种类并非用以限制本发明。在其他实施例中，发光单元130亦可利用其他不同的发光材料来制作。
前框140设置导光元件120与显示面板200之间，以承载显示面板200。前框140设置在导光元件120的上方，并覆盖发光单元130与空气间隙114，藉此避免来自发光单元130的光线131在未进入导光元件112前先经由空气间隙114直接进入显示面板200。前框140亦覆盖导光元件120的一部分。前框140在XY平面上沿着导光元件120延伸的反方向上水平地连接承载件110的第一部分111的顶面111A，使得前框140与承载件110的第一部分111一起遮盖发光单元130。在一例子中，前框140可以连接到发光单元130平行于导光元件120延伸的方向上的侧面。
胶体单元150设置在导光元件120与承载件110之间，在一实施例中，胶体单元150用以分别连接于承载件110的第二部分112与导光元件120。藉此，可达到将导光元件120经由胶体单元150固定在承载件110的第二部分112上的目的。因此，也可以视为胶体单元150夹置在导光元件120与承载件110的第二部分112之间。在一实施例中，胶体单元150包含由多层材料层所组成的叠层结构。例如，胶体单元150至少包含第一胶层151、第二胶层152以及反射结构153。第一胶层151或第二胶层152可以分别是用于黏贴反射片或印刷电路板(PCB)的黏胶，例如光学透明胶(Optically Clear Adhesive,OCA)。第一胶层151贴附于导光元件120，使得第一胶层151夹置在导光元件120与反射结构153之间。在本实施方式 中，第二胶层152贴附于承载件110的第二部分112以利用胶体单元150将导光元件120固定于承载件110上，使得第二胶层152夹置在反射结构153与承载件110的第二部分112之间，藉由第二胶层152将导光元件120固定于承载件110上，达到固定导光元件120的功效。在一实施例中，反射结构153的至少一部分设置在第一胶层151与第二胶层152之间，用以反射光线。在本实施方式中，反射结构153是整体夹置在第一胶层151与第二胶层152之间的光反射材料，以构成胶体单元150的叠层结构。在一实施例中，胶体单元150设置于邻近发光单元130且介于导光元件120与承载件110之间。如此，进入到导光元件112的光线被反射结构153反射，可维持邻近入光面部分的出光面辉度。
在一实施例中，第一胶层151的穿透率小于第二胶层的穿透率152。藉此，可以降低来自发光单元130的光线131，穿过第一胶层151的靠近发光单元130的入光面151A而进入第一胶层151的光量，达到减少导光元件120靠近前框140的位置处产生亮带及热点的目的。
在一示范性的例子中，40％≤第一胶层151的穿透率≤85％。当第一胶层151的穿透率低于40％，则会降低第一胶层151的黏着力，而不利于第一胶层151固定导光元件120的能力，当第一胶层151的穿透率高于85％时，则容易发生亮带及热点出光不均匀的问题。
图2是绘示依照本发明的第一实施方式的第一胶层151的穿透率对热点程度所得的折线图。图2中的横轴为穿透率百分比(％)，纵轴为热点程度评估值。从图2可知，当第一胶层151的穿透率大于85％时，热点程度评估值会超过预定值，使得显示面板200容易发生习知亮带及热点201的问题。
在一些例子中，第一胶层151为包含色料的光学胶，色料是用以低光线穿透率的色料。在一些例子中，色料的颜色为白色。藉此，前述方式的任何一者，可达到将第一胶层151的穿透率降低到不大于85％以及不小于40％的范围的目的。要说明的是，本实施方式的第一胶层151的材料与色料并非用以限制本发明。在其他实施例中，第一胶层151的光学胶亦可利用扩散粒子来混合，以得到穿透率较低的第一胶层。
在一实施例中，第一胶层151的厚度大于第二胶层152的厚度，可达到增加第一胶层151与导光元件120之间的黏着强度的功效。换言之，由于第一胶层151所添加的色料或粒子量大于第二胶层152所添加的色料或粒子量，因此可藉由增加第一胶层151的厚度，来增加色料或粒子之间的黏着强度，确保第一胶层151与导光元件120的黏着强度。
请参照图3，图3是绘示依照本发明的第一实施方式的一种变形实施例的局部剖面图示意图。在变形实施例中，背光模组100还包含主反射片160。主反射片160容置于容置空间113中，并沿着导光元件120延伸的方向延伸。在本变形实施例中，主反射片160不同于反射结构153，也就是说主反射片160与反射结构153彼此不相连，而使主反射片160与反射结构153不须一次安装，这有助于装配背光模组100的便利性。本变形实施例中的导光元件120，具有连接于入光面121的反射面123，使得第一胶层151贴附于导光元件120的反射面123的一部分上。来自发光单元130的光线131从入光面121进入导光元件120后，即通过反射结构153与主反射片160的合作，藉由反射面123在导光元件120中的多次反射，进而均匀地传递至导光元件120的各处。在本变形实施例中，主反射片160与胶体单元150分别独立地设置于反射面123与承载件110之间，特别是胶体单元150比主反射片160更靠近发光单元130。反射结构153大致设置在第一胶层151与第二胶层152之间，使得第一胶层151、第二胶层152以及反射结构153具有大致对应彼此的形状与尺寸。另外，可以安排发光单元130的电路板133取代承载件110的第一部分111的一部分，来围绕容置空间113，使得电路板133在Z方向上分别连接到前框140与承载件110的第二部分112的边缘。
请参照图4，图4是绘示依照本发明的第一实施方式的另一种变形实施例的局部剖面图示意图。背光模组100还包含主反射片160。主反射片160容置于容置空间113中，并沿着导光元件120延伸的方向延伸。在本变形的实施例中，反射结构153是主反射片160的一部分，也就是说主反射片160与反射结构153彼此相连。例如，反射结构153为主反射片160朝发光单元130延伸的一部分，以求反射光线的一致性，具有达到更佳的出 光均匀度的功效。
请参照图5，图5是绘示依照本发明的第二实施方式沿着图1A的A-A’剖面线剖切的局部剖面图示意图。图5中的Y方向与Z方向分别对应于图1B中所示的Y方向与Z方向。在本实施例中，电路板133平行于导光元件120设置，使得电路板133的一部分延伸至承载件110与发光元件132之间，电路板133的另一部分则延伸至承载件110与导光元件120之间，并固定于承载件110上。更详言之，胶体单元150的第一胶层151贴附于导光元件120，第二胶层152贴附于电路板133，使得电路板133夹置于第二胶层152与承载件110之间，且相对固定于导光元件120与承载件110上。
要说明的是，本发明各实施例所述的第一部分的数量、第二部分的形状、导光元件的形状、发光单元的种类、发光单元的数量、光线的颜色、胶体单元的材料、主反射片的材料、第一胶层的厚度、或是第二胶层的厚度仅用以示范说明，并非用以限制本发明。在其他实施例中，上述元件的形状、数量、材料、或厚度可依需求而改变。在一些实施例中，反射结构与主反射片可以相连或不相连。相连的反射结构与主反射片可以形成为一体成型的结构，且其形状可搭配容置空间的形状来设计。
由上述本发明实施例可知，本发明通过胶体单元将导光元件固定至承载件上，其中第一胶层贴附于导光元件的反射面以及反射结构，第二胶层贴附于承载件以及反射结构，且第一胶层具有较低穿透率的特性，藉此可以减少光线经由第一胶层穿过导光元件，由此不仅达到窄边框的设计目的，并且兼顾整体出光面的光学品味，例如：可达到减轻导光元件靠近入光面的发光区位置处产生亮带、热点或不均匀情况。
依照图2中所绘示的实验结果可以得知，第一胶层的穿透率为不大于85％。第一胶层的穿透率可以具有40％-85％的范围，且包含端点值。第一胶层的穿透率低于40％容易发生黏着力不佳的问题，第一胶层的穿透率超过85％则容易使习知的亮带及热点的问题变得明显，而影响显示装置整体的视觉观感。第一胶层的穿透率小于第二胶层的穿透率，藉此可以降低习知背光模组的亮带及热点的问题。可以通过将第一胶层的厚度调整为大于 第二胶层的厚度，藉此达到第一胶层的穿透率小于第二胶层的穿透率的目的。或是，可以在第一胶层中加入色料来调整第一胶层的成分，藉此达到第一胶层的穿透率小于第二胶层的穿透率的目的，进而使得显示装置具有较佳的整体视觉观感。
以上所述仅为本发明的较佳实施例，凡依本发明的权利要求所做的均等变化与修饰，皆应属本发明的涵盖范围。
【附图标记列表】
10…显示装置
100…背光模组
110…承载件
111…第一部分
111A…顶面
112…第二部分
113…容置空间
114…空气间隙
120…导光元件
121…入光面
122…出光面
123…反射面
130…发光单元
131…光线
132…发光元件
133…电路板
140…前框
150…胶体单元
151…第一胶层
151A…入光面
152…第二胶层
153…反射结构
160…主反射片
200…显示面板
201…亮带及热点
210…出光面。

Claims (10)

  1. 一种导光组件可被胶黏的背光模组，包含：
    承载件，其具有容置空间；
    导光元件，其容置于所述容置空间中，且具有入光面；
    发光单元，其设置于靠近所述入光面的一侧；以及
    胶体单元，其设置在所述导光元件与所述承载件之间，并包含第一胶层、第二胶层及反射结构，其中所述第一胶层贴附于所述导光元件，所述反射结构的至少一部分设置在所述第一胶层与所述第二胶层之间，以及所述第一胶层的穿透率小于所述第二胶层的穿透率。
  2. 根据权利要求1所述的导光组件可被胶黏的背光模组，其中，所述第二胶层贴附于所述承载件。
  3. 根据权利要求1所述的导光组件可被胶黏的背光模组，其中，所述导光元件具有连接于所述入光面的反射面，所述导光组件可被胶黏的背光模组还包含：
    主反射片，所述主反射片与所述胶体单元设置于所述反射面与所述承载件之间，且所述胶体单元比所述主反射片更靠近所述发光单元。
  4. 根据权利要求3所述的导光组件可被胶黏的背光模组，其中，所述反射结构为所述主反射片朝所述发光单元延伸的一部分。
  5. 根据权利要求1所述的导光组件可被胶黏的背光模组，其中，所述发光单元还包含多个发光元件及电路板，所述发光元件设于所述电路板上，所述电路板的一部分延伸至所述承载件与所述导光元件之间，且所述第二胶层贴附于所述电路板。
  6. 根据权利要求1所述的导光组件可被胶黏的背光模组，其中，所述第一胶层的穿透率为40％-85％，且包含端点值。
  7. 根据权利要求1所述的导光组件可被胶黏的背光模组，其中，所述第一胶层的厚度大于所述第二胶层的厚度。
  8. 根据权利要求1所述的导光组件可被胶黏的背光模组，其中，所述第一胶层包含色料。
  9. 一种显示装置，包含：
    根据权利要求1至8中任一项所述的导光组件可被胶黏的背光模组；以及
    显示面板，其设置于所述导光组件可被胶黏的背光模组的上方。
  10. 根据权利要求9所述的显示装置，其中，所述导光组件可被胶黏的背光模组还包含：
    前框，其设置在所述导光元件与所述显示面板之间，以承载所述显示面板。
PCT/CN2022/129241 2022-09-14 2022-11-02 导光组件可被胶黏的背光模组与显示装置 WO2024055395A1 (zh)

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