WO2020119087A1 - 一种反射片、背光模组及显示设备 - Google Patents

一种反射片、背光模组及显示设备 Download PDF

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Publication number
WO2020119087A1
WO2020119087A1 PCT/CN2019/094264 CN2019094264W WO2020119087A1 WO 2020119087 A1 WO2020119087 A1 WO 2020119087A1 CN 2019094264 W CN2019094264 W CN 2019094264W WO 2020119087 A1 WO2020119087 A1 WO 2020119087A1
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WO
WIPO (PCT)
Prior art keywords
plate
arc
bottom plate
connecting plate
sheet according
Prior art date
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Ceased
Application number
PCT/CN2019/094264
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English (en)
French (fr)
Inventor
刘欣
尤君平
洪文生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Skyworth RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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Filing date
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Publication of WO2020119087A1 publication Critical patent/WO2020119087A1/zh
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Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—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

Definitions

  • the present application relates to the technical field of display devices, such as a reflective sheet, a backlight module, and a display device.
  • the conventional direct type backlight module includes a back plate 1', a reflection sheet 2', a light source 3', a diffusion plate 4'and an optical film 5'. Since the light source 3'and the reflection sheet 2'in the direct type backlight module need to have a certain distance, both the back plate 1'and the reflection sheet 2'include a flat plate and an inclined plate provided around the flat plate.
  • the light source 3' generally includes a light emitting diode (Light Emitting Diode, LED) lamp bead 32' and a lens 31'. The light of the LED lamp beads 32' is regularly emitted after the secondary light distribution of the lens 31', and a regionalized light energy distribution is formed on the diffusion plate.
  • LED Light Emitting Diode
  • part of the reflective sheet 2 ′ receives less light, forming a light-receiving area d.
  • the distribution on the diffusion plate 4' is uneven, so that part of the diffusion plate 4'can have sufficient light to form a bright area a, and some areas cannot receive sufficient light.
  • the dark area c can be formed; in addition, the edge LED lamp beads 32' are far away from the top corners of the diffuser plate 4', resulting in insufficient light energy received at the four corners of the diffuser plate 4', due to insufficient brightness Vignette b appears. Due to the existence of the bright area a, the dark area c, and the dark angle b, the overall visual effect of the backlight module will exhibit a layering phenomenon between light and dark.
  • the related art In order to improve the defects of the visual effect of the backlight module, the related art generally uses a film with high shielding property and a high diffusivity reflective film, and at the same time increases the number of LED lamp beads to improve the visual effect, but the cost is higher and the effect difference.
  • the present application proposes a reflective sheet, which can improve the light and dark visual effects of the backlight module while reducing costs.
  • an embodiment of the present application provides a reflective sheet, which includes a first bottom plate and a first inclined plate disposed around an edge of the first bottom plate, an arc is formed between the first bottom plate and the first inclined plate Plate connection, the arc-shaped plate is arranged to protrude in a direction away from the first inclined plate 22.
  • an embodiment of the present application further provides a backlight module, including a backplane, the backplane includes a second bottom plate and a second slant plate disposed around an edge of the second bottom plate, the backlight module further includes In the above reflection sheet, the first bottom plate is stacked on the second bottom plate, and the first inclined plate is stacked on the second inclined plate.
  • an embodiment of the present application further provides a display device, including the above backlight module.
  • Figure 1 is a cross-sectional view of a backlight module in the related art
  • Figure 2 is the distribution of light energy in the backlight module in the related art
  • FIG. 3 is a cross-sectional view of a partial structure of light energy distribution in a backlight module provided by an embodiment of the present application;
  • FIG. 4 is a light output pattern formed when only LED lamp beads are provided according to an embodiment of the present application.
  • FIG. 5 is a light-out pattern formed by assembling the LED lamp bead and lens provided by an embodiment of the present application;
  • FIG. 6 is a schematic diagram of designing the outer contour of an arc-shaped plate provided by an embodiment of the present application.
  • FIG. 7 is a cross-sectional view of a partial structure of a backlight module provided by an embodiment of the present application.
  • FIG. 9 is a concentration distribution curve of diffuse particles on an outer contour line extending along a circumferential direction on an arc plate provided by an embodiment of the present application.
  • Second bottom plate 12. Second inclined plate; 21, first bottom plate; 22, first inclined plate; 23, curved plate; 231, second connection plate; 232, first connection plate; 31, lens; 32. LED lamp beads; 4. Diffusion plate; 5. Optical diaphragm;
  • a bright area
  • b vignetting
  • c dark area
  • d low light area
  • the present application provides a reflective sheet, a backlight module, and a display device.
  • the first bottom plate and the first inclined plate are connected by an arc-shaped plate, and the arc surface of the arc-shaped plate can receive part of the light that the reflective sheet cannot receive in the related art, and the reflection of the light through the arc surface can It is evenly delivered to the edge area of the diffusion plate, and the dark area and dark angle are optimized simultaneously, thereby optimizing the visual effect of the backlight module, which is beneficial to reducing the number of LED lamp beads, thereby reducing costs.
  • the display device may be an electronic device with an image display function, such as a television, a display screen, and an advertising machine.
  • the display device includes a display panel and a backlight module.
  • the display panel is disposed on the light exit surface of the backlight module.
  • the backlight module provides the display panel with a sufficient and uniform surface light source for the display panel to display image information.
  • the backlight module may be a direct type backlight module.
  • the backlight module includes a back plate, a reflection sheet, a diffusion plate 4, a light source, and an optical film 5.
  • the back plate is used to support and fix other components of the backlight module.
  • the light source, the reflection sheet, the diffusion plate 4 and the optical film 5 are sequentially arranged on the back plate. The light emitted from the light source passes through the diffusion plate 4 and the optical film 5 in turn to illuminate the display panel.
  • a reflection sheet is also provided on the back plate, and the reflection sheet is located between the back plate and the diffusion plate 4 for reflecting the light not directly incident on the diffusion plate 4 onto the diffusion plate 4 to increase the backlight mode
  • the brightness of the surface light source formed by the group is also provided on the back plate, and the reflection sheet is located between the back plate and the diffusion plate 4 for reflecting the light not directly incident on the diffusion plate 4 onto the diffusion plate 4 to increase the backlight mode The brightness of the surface light source formed by the group.
  • the back plate includes a second bottom plate 11 and a second inclined plate 12 disposed around the edge of the second bottom plate 11, the top end of the second inclined plate 12 extends with a flange parallel to the second bottom plate 11, the diffusion plate 4 and the optical
  • the edge of the diaphragm 5 overlaps the folded edge and forms a light propagation space with the back plate.
  • the reflection sheet includes a first bottom plate 21 and a first inclined plate 22 disposed around the edge of the first bottom plate 21, the first bottom plate 21 covers the second bottom plate 11, the first inclined plate 22 covers the second inclined plate 12, The light in the propagation space can be directly incident or reflected on the diffusion plate 4.
  • the light source includes a plurality of LED lamp beads 32 disposed on the substrate.
  • the substrate may be fixed on the second bottom plate 11 by bonding or screws.
  • the first bottom plate 21 is provided with a through hole at a position corresponding to the LED lamp bead 32, and the lamp bead passes through the first bottom plate 21 through the through hole, so that light can be incident on the diffusion plate 4.
  • FIG. 4 is a light emitting pattern of the LED lamp beads 32, wherein the light emitting pattern e of the LED lamp beads 32 is nearly elliptical, and the light emitted by the LED lamp beads 32 is mainly concentrated in the front direction of the light emitting surface, and the light energy closer to the edge The less, the maximum beam angle is around 120°. Since the maximum light emitting angle of the individual LED lamp beads 32 is small and the light energy at the edges is small, the light cannot be evenly incident on all corners of the diffusion plate 4. Therefore, the light source also includes a lens 31 covering the LED lamp beads 32, Each LED lamp bead 32 is covered with a lens 31, which can increase the maximum light emitting angle of the light and increase the light energy at the edge of the light emitting type.
  • FIG. 5 is a diagram of the light output pattern after the LED lamp beads 32 are matched with the lens 31. As shown in FIG. 5, after the LED lamp bead 32 is matched with the lens 31, the light emitting type changes from near ellipse to butterfly shape, and the maximum light emitting angle is increased to about 150°, which is beneficial to improve the uniformity of the light received on the diffusion plate 4.
  • the LED lamp bead 32 and the lens 31 increase the maximum light-emitting angle, due to the existence of the maximum light-emitting angle, the area near the junction of the slant plate and the bottom plate of the related art cannot receive sufficient light energy, which in turn leads to The corresponding partial area of the diffuser plate 4 cannot obtain sufficient light energy to form a dark area, and the four corners of the diffuser plate 4 can not obtain sufficient light energy due to the distance from the light source to form a dark angle, dark angle and dark area It will cause failures such as light and dark layers in the display device.
  • the reflection sheet further includes an arc-shaped plate 23 connecting the first inclined plate 22 and the first bottom plate 21, the arc-shaped plate 23 is provided to protrude in a direction away from the first inclined plate 22, wherein the front The side is the side close to the diffusion plate 4.
  • the arc surface of the arc-shaped plate 23 has a certain diffusivity, and can receive part of the light that the reflective sheet cannot receive in the related art, thereby reducing or eliminating the low light area, and the reflection of the light through the arc surface can be uniformly transported to the diffusion plate
  • the edge area of 4 forms a uniform light energy area g at the edges and corners of the diffusion plate 4, and simultaneously optimizes the dark area and the dark angle to optimize the visual effect of the backlight module.
  • the provision of the arc-shaped plate 23 can reduce the cost of the reflective sheet and the optical membrane 5, and is beneficial to reduce the number of LED lamp beads 32, thereby reducing overall
  • the design cost of the backlight module, and the arc plate 23 improves the light scattering effect, can also reduce the distance between the diffusion plate 4 and the back plate, which is conducive to the design of ultra-thin direct-lit display devices.
  • the arc-shaped plate 23 can be made of a material with high diffusivity to improve the optimization effect on dark areas and dark corners.
  • the first inclined plate 22 and the second inclined plate 12 can be made of ordinary smooth materials, which is beneficial to reduce the cost of the reflective sheet.
  • the reflection sheet further includes a first connecting plate 232 provided at the first end and a second connecting plate 231 provided at the second end.
  • the first connecting plate 232 is parallel to the first inclined plate 22
  • the two connecting plates 231 are parallel to the first bottom plate 21, and the first connecting plates 232 and the second connecting plates 231 are respectively fixed to the back plate.
  • the end surface of the first connecting plate 232 may be aligned with and abutted with the end surface of the first inclined plate 22, the first connecting plate 232 is fixed to the back plate by glue or screws, and the first inclined plate 22 is fixed by glue or screws It is fixed to the back plate so that the front sides of the first connecting plate 232 and the first inclined plate 22 are flush, that is, the first connecting plate 232 and the first inclined plate 22 are coplanar, which is beneficial to improve the uniformity of light reflection.
  • the end surface of the second connection plate 231 may be aligned with and abutted with the end surface of the first bottom plate 21, the second connection plate 231 may be fixed to the back plate by glue or screws, and the first bottom plate 21 may be fixed to the back plate by glue or screws, so that The front surface of the first bottom plate 21 and the second connecting plate 231 are flush, that is, the second connecting plate 231 and the first bottom plate 21 are coplanar, which is beneficial to improve the uniformity of light reflection.
  • a portion of the first connecting plate 232 may be overlapped on the first inclined plate 22, and the portion where the screws are stacked through the two is fixed to the back plate, or the back plate, the first connecting plate 232 and the first The two inclined plates 22 are fixed by glue.
  • the second connecting plate 231 and the first bottom plate 21 can also be fixed by screws after overlapping, or two or two of the second connecting plate 231, the first bottom plate 21 and the back plate can be fixed by glue.
  • the maximum light emitting angle of the light source is 150° as an example, and the contour surface of the arc-shaped plate 23 is designed.
  • the circumferential contour of the arc-shaped plate 23 is an arc-shaped outer contour, and the arc-shaped outer contour may be a circular arc.
  • the arc line extends in the axial direction to form the outer contour surface of the arc-shaped plate 23.
  • the propagation path of the boundary light with a light angle of 150° is simulated, and the intersection O of the first inclined plate 22 and the first bottom plate 21 of the reflection sheet is perpendicular to the boundary light OC, and then select points D and E on the first inclined plate 22 and the first bottom plate 21, respectively, and draw an arc line through points C, D, and E to obtain a desired arc line.
  • the arc-shaped plate 23 has a certain thickness, there is a certain distance between the point D and the second inclined plate 12, and between the point E and the second bottom plate 11, which is the distance of the arc-shaped plate 23 thickness.
  • the size of the curved plate 23, the first inclined plate 22 and the first bottom plate 21 can be adjusted.
  • the first bottom plate 21 is provided with a through hole through which the lens 31 passes, the radius of the through hole is R, and the connection between the arc plate 23 and the second connection plate 231
  • the distance between the central axis of the through hole near the edge of the first bottom plate 21 (that is, the distance from the most through hole to the point E) is L3+R, the first bottom plate 21 and all
  • the distance between the intersection of the extension line of the first inclined plate 22 and the central axis of the through hole near the edge of the first bottom plate 21 is L1+R, then .
  • the sum of the lengths of the first connecting plate 232 and the first inclined plate 22 is L4, and the length of the second inclined plate 12 is L2, then .
  • the size of the curved plate 23, the first inclined plate 22 and the first bottom plate 21 can also be adjusted according to the actual assembly effect, comprehensively considering the depth of the back plate, the inclination angle of the first inclined plate 22 in the reflection sheet and the arrangement of the light source, etc. Factors to get better optimization results.
  • the length L6 of the first connecting plate 232 may be not less than 1/12 of the length L2 of the second inclined plate 12, and the length L5 of the second connecting plate 231 may not be less than The distance L1 between the hole and the edge of the second bottom plate 11 is 1/6.
  • the length L6 of the first connecting plate 232 may be 15-20 mm
  • the length L5 of the second connecting plate 231 may be 15-20 mm, for example, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, and 20 mm.
  • the arc plate 23 can also be coated with diffusion particles, which can cause the light to diffusely reflect on the arc plate 23,
  • the regularly distributed light energy in the propagation space can be dispersed, so that the light energy is evenly delivered to the edge area of the diffusion plate 4, and the dark angle and dark area are optimized simultaneously.
  • the diffusion particles may be made of polymethyl methacrylate (PMMA) or poly-n-butyl methacrylate (PBMA).
  • PMMA polymethyl methacrylate
  • PBMA poly-n-butyl methacrylate
  • the radius of the diffused particles should not be too large or too small.
  • the radius of the diffusion particles may be 10 ⁇ m-30 ⁇ m, such as 10 ⁇ m, 12 ⁇ m, 14 ⁇ m, 16 ⁇ m, 18 ⁇ m, 20 ⁇ m, 22 ⁇ m, 24 ⁇ m, 26 ⁇ m, 28 ⁇ m, 30 ⁇ m.
  • the material of the diffused particles and the radius of the diffused particles can also be adjusted according to actual needs.
  • the concentration distribution of the diffused particles on the arc-shaped plate 23 can be adjusted as needed, and different concentrations have different reflection effects on light.
  • the concentration of diffused particles at corresponding positions on the arc plate 23 can be adjusted according to the distribution of dark areas and dark angles.
  • the concentration of the diffused particles gradually decreases from the center of the arc plate 23 in the circumferential direction to both ends.
  • the concentration of diffused particles at each point on the straight line parallel to the axis of the contour surface of the arc plate 23 can be equal, and the concentration of diffused particles at each point on the arc line extending along the circumferential direction on the arc plate 23 is different, and the two The concentration at the end is less than the concentration at the middle.
  • the light energy received by the arc plate 23 gradually decreases from the middle area to the edges of both ends, increasing the concentration of the diffusing particles in the middle area of the arc plate 23 can diffuse the light energy to both ends, making the light distribution uniform, which is beneficial to The light energy received in each area on the surface of the diffusion plate 4 is more uniform, thereby improving the visual effect.
  • FIG. 8 is a cross section of the arc-shaped plate 23, and the outer contour line of the cross section includes a circular arc line, and the connecting line D′E′ between the two ends of the circular arc line is used as the X axis.
  • a straight line passing through the midpoint C of the arc and perpendicular to D'E' is the Y axis to establish a coordinate system, then the concentration distribution of diffuse particles at each point on the arc on the arc plate 23 along the circumferential direction is shown in FIG. 9 ,
  • the concentration distribution curve satisfies the following formula:
  • k and m are constants
  • h is the minimum diameter of the diffused particles.
  • the constants k and m affect the curvature of the concentration distribution curve.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

一种反射片、背光模组及显示设备，涉及显示设备技术领域。该反射片包括第一底板（21）以及环绕第一底板（21）边缘设置的第一斜板（22），第一底板（21）与第一斜板（22）之间通过弧形板（23）连接，弧形板（23）设置为沿远离该第一斜板（22）的方向凸设。

Description

一种反射片、背光模组及显示设备
本申请要求在2018年12月14日提交中国专利局、申请号为201811536994.3的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示设备技术领域，例如一种反射片、背光模组及显示设备。
背景技术
如图1所示，传统直下式背光模组包括背板1＇、反射片2＇、光源3＇、扩散板4＇及光学膜片5＇。由于直下式背光模组中光源3＇与反射片2＇需要具有一定的距离，背板1＇和反射片2＇均包括平板以及围绕平板设置的斜板。光源3＇一般包括发光二极管(Light Emitting Diode，LED)灯珠32＇和透镜31＇。LED灯珠32＇的光经透镜31＇的二次配光后规律出射，在扩散板上形成区域化的光能分布。
如图2所示，由于透镜31＇发光角度的限制，反射片2＇的部分区域入射的光线较少，形成少光区d。LED灯珠32＇发出的光线经反射片2＇反射后，在扩散板4＇上的分布不均匀，使扩散板4＇的部分区域光能充足形成亮区a，部分区域无法接收充分的光能而形成暗区c；此外，边缘的LED灯珠32＇距离扩散板4＇的顶部角落距离较大，导致扩散板4＇的四个角落处无法接收到足够的光能，会因亮度不足呈现出暗角b。由于亮区a、暗区c和暗角b的存在，背光模组的整体视效会呈现出明暗相间的分层现象。
为改善背光模组视效上的瑕疵，相关技术中一般采用具有高遮蔽性的膜片和高扩散性的反射片，同时增加LED灯珠的数量，来改善视觉效果，但成本较高且效果差。
发明内容
本申请提出一种反射片，可以改善背光模组亮暗相间的视效情况，同时降低成本。
第一方面，本申请实施例提供一种反射片，包括第一底板以及环绕所述第一底板边缘设置的第一斜板，所述第一底板与所述第一斜板之间通过弧形板连接，所述弧形板设置为沿远离所述第一斜板22的方向凸设。
第二方面，本申请实施例还提供一种背光模组，包括背板，所述背板包括第二底板以及环绕所述第二底板边缘设置的第二斜板，所述背光模组还包括上 述的反射片，所述第一底板叠放于所述第二底板上，所述第一斜板叠放于所述第二斜板上。
第三方面，本申请实施例还提供一种显示设备，包括上述的背光模组。
附图说明
图1是相关技术中背光模组的剖视图；
图2是相关技术中背光模组中光能分布情况；
图3是本申请一实施例提供的背光模组中光能分布情况部分结构的剖视图；
图4是本申请一实施例提供的仅设置LED灯珠时形成的出光光型图；
图5是本申请一实施例提供的LED灯珠与透镜装配后形成的出光光型图；
图6是本申请一实施例提供的设计弧形板的外轮廓线时的原理图；
图7是本申请一实施例提供的背光模组部分结构的剖视图；
图8是本申请一实施例提供的设计弧形板上扩散粒子浓度时建立的坐标系；
图9是本申请一实施例提供的弧形板上沿周向延伸的外轮廓线上扩散粒子的浓度分布曲线。
其中：
11、第二底板；12、第二斜板；21、第一底板；22、第一斜板；23、弧形板；231、第二连接板；232、第一连接板；31、透镜；32、LED灯珠；4、扩散板；5、光学膜片；
g、均匀光能区；e、LED灯珠的出光光型；f、LED灯珠搭配透镜后的出光光型；
1＇、背板；2＇、反射片；3＇、光源；31＇、透镜；32＇、LED灯珠；4＇、扩散板；5＇、光学膜片；
a、亮区；b、暗角；c、暗区；d、少光区。
具体实施方式
下面结合附图并通过具体实施方式来进一步说明本申请的技术方案。
本申请提供了一种反射片、背光模组及显示设备。该反射片中，第一底板和第一斜板之间通过弧形板连接，弧形板的弧面可以接收到相关技术中反射片接收不到的部分光线，且光线经过弧面的反射能够均匀输送至扩散板的边缘区域，同步优化暗区和暗角，从而优化背光模组的视效，有利于减少LED灯珠的 数量，从而降低成本。
本实施例提供了一种显示设备，显示设备可以为电视机、显示屏、广告机等具有图像显示功能的电子设备。显示设备包括显示面板以及背光模组。显示面板设置于背光模组的出光面，背光模组为显示面板提供亮度充足且均匀的面光源，以便显示面板显示图像信息。
如图3所示，本实施例中，背光模组可以为直下式背光模组，该背光模组包括背板、反射片、扩散板4、光源及光学膜片5。背板用于支撑固定背光模组其他部件。光源、反射片、扩散板4及光学膜片5依次设置在背板上。光源发出的光线依次经过扩散板4和光学膜片5后照射在显示面板上。为提高光线的利用率，背板上还设置有反射片，反射片位于背板和扩散板4之间，用于将未直接射入扩散板4的光线反射至扩散板4上，增加背光模组形成的面光源的亮度。
由于直下式背光模组中，光源位于扩散板4的下方，为使光源发出的光线尽量均匀覆盖扩散板4的表面，光源与扩散板4之间具有一定的距离，以便光线以合适的入射角度照射在扩散板4上。为此，背板包括第二底板11和围绕第二底板11的边缘设置的第二斜板12，第二斜板12的顶端延伸有与第二底板11平行的折边，扩散板4和光学膜片5的边缘搭接在折边上，并与背板形成光线的传播空间。反射片包括第一底板21以及围绕第一底板21的边缘设置的第一斜板22，第一底板21覆盖在第二底板11上，第一斜板22覆盖在第二斜板12上，以使传播空间内的光线均能直接入射或反射到扩散板4上。
本实施例中，光源包括设置在基板上的多颗LED灯珠32。基板可以通过粘接或螺钉固定在第二底板11上。第一底板21在与LED灯珠32对应的位置设置有通孔，灯珠通过通孔穿过第一底板21，从而使光线能够入射到扩散板4上。
图4为LED灯珠32的出光光型图，其中LED灯珠32的出光光型e为近椭圆形，LED灯珠32发出的光线主要集中在发光面的正面方向，越靠近边缘的光能越少，最大出光角度在120°左右。由于单独LED灯珠32的最大出光角度较小，且边缘的光能较少，无法将光线均匀入射到扩散板4的各个角落，因此，光源还包括覆盖在LED灯珠32上的透镜31，每个LED灯珠32上均覆盖有一个透镜31，透镜31可以增大光线的最大出光角度，并增加出光光型边缘处的光能。
图5为LED灯珠32搭配透镜31后的出光光型图。如图5所示，LED灯珠32搭配透镜31后，出光光型由近椭圆形变为蝶形，且最大出光角度增大至150°左右，有利于提高扩散板4上接收光线的均匀性。
虽然LED灯珠32搭配透镜31后增大了最大出光角度，但由于最大出光角度的存在，导致相关技术中反射片的斜板与底板的交界处附近区域无法接收到充足的光能，进而导致扩散板4的对应的部分区域无法得到充足的光能而形成暗区，扩散板4的四个角落由于与光源的距离较远也无法得到充足的光能而形成暗角，暗角和暗区将导致显示设备出现亮暗分层等失效问题。
如图3所示，反射片还包括连接第一斜板22和第一底板21的弧形板23，弧形板23设置为沿远离所述第一斜板22的方向凸设，其中，前侧即为靠近扩散板4的一侧。弧形板23的弧面具有一定的扩散性，可以接收到相关技术中反射片接收不到的部分光线，从而减小或消除少光区，且光线经过弧面的反射能够均匀输送至扩散板4的边缘区域，使扩散板4的边缘及角落位置形成均匀光能区g，同步优化暗区和暗角，从而优化背光模组的视觉效果。相比相关技术中采用高成本的材质制作反射片和光学膜片5，设置弧形板23可以降低反射片和光学膜片5的成本，而且有利于减少LED灯珠32的数量，从而全面降低背光模组的设计成本，且通过弧形板23改善光线的打散效果，还可以减小扩散板4和背板之间的距离，有利于实现超薄直下式显示设备的设计。为进一步提高弧形板23对光线的反射效果，弧形板23可以采用具有高扩散性的材料制成，以提高对暗区和暗角的优化效果。而第一斜板22和第二斜板12则可以采用普通的光面材料制成，有利于降低反射片的成本。
为方便弧形板23的固定，反射片还包括设置于第一端的第一连接板232和设置于第二端的第二连接板231，第一连接板232与第一斜板22平行，第二连接板231与第一底板21平行，且第一连接板232和第二连接板231分别与背板固定。通过设置第一连接板232和第二连接板231，可以增大弧形板23与背板的基础面积，提高弧形板23固定的稳定性。在一实施例中，第一连接板232的端面可以与第一斜板22的端面对齐并抵接，第一连接板232通过胶或螺钉与背板固定，第一斜板22通过胶或螺钉与背板固定，使得第一连接板232和第一斜板22的前侧面平齐，即第一连接板232与第一斜板22共面，有利于提高光线的反射均匀性。第二连接板231的端面可以与第一底板21的端面对齐并抵接， 第二连接板231可以通过胶或螺钉与背板固定，第一底板21可以通过胶或螺钉与背板固定，使得第一底板21与第二连接板231的前侧面平齐，即第二连接板231与第一底板21共面，有利于提高光线的反射均匀性。
在其他实施例中，第一连接板232的部分可以搭接在第一斜板22上，螺钉穿过二者叠放的部分与背板固定，或背板、第一连接板232和第一斜板22中两两之间通过胶粘接固定。对应地，第二连接板231和第一底板21也可以搭接后通过螺钉固定，或是第二连接板231、第一底板21和背板中两两之间通过胶粘接固定。
本实施例中，如图6和图7所示，本实施例中以光源的最大出光角度为150°为例，设计弧形板23的轮廓面。
在一实施例中，弧形板23的周向轮廓线为弧形外轮廓线，该弧形外轮廓线可以为圆弧线。圆弧线沿轴向延伸形成弧形板23的外轮廓面。设置弧形板23的外轮廓面时只需要设计圆弧线即可。以相关技术中未增加弧形板23的结构为基础，模拟出光角度为150°的边界光线的传播路径，经反射片第一斜板22和第一底板21的交点O向边界光线做垂线OC，再在第一斜板22和第一底板21上分别选取D点和E点，经过C点、D点和E点绘制圆弧线，则得到所需圆弧线。
在一实施例中，由于弧形板23具有一定的厚度，D点与第二斜板12之间、E点和第二底板11之间均具有一定的距离，该距离为弧形板23的厚度。
为使选取的D点和E点能够使弧形板23具有更好的优化暗角或暗区的效果，可以调整弧形板23、第一斜板22和第一底板21的尺寸。如图3及图7所示，所述第一底板21上设置有使透镜31穿过的通孔，所述通孔的半径为R，弧形板23与所述第二连接板231的连接处与靠近所述第一底板21边缘的所述通孔的中心轴线之间的距离(即最边缘的通孔到E点之间的距离)为L3+R，所述第一底板21和所述第一斜板22的延长线交点到靠近所述第一底板21边缘的所述通孔的中心轴线之间的距离为L1+R，则
Figure PCTCN2019094264-appb-000001
。第一连接板232与第一斜板22的长度和为L4，第二斜板12的长度为L2，则
Figure PCTCN2019094264-appb-000002
。当L1、L2、L3及L4满足上述关系时，可以获得较好的优化效果。
弧形板23、第一斜板22和第一底板21的尺寸也可以根据实际的组装效果调整，综合考虑背板深度、反射片中第一斜板22的倾斜角度以及光源的排布方 式等因素，以获得更好的优化效果。
为提高弧形板23固定的稳定性，第一连接板232的长度L6可以不小于第二斜板12的长度L2的1/12，第二连接板231的长度L5可以不小于最边缘的通孔与第二底板11边缘之间距离L1的1/6。在一实施例中，第一连接板232的长度L6可以为15mm-20mm，第二连接板231的长度L5可以为15-20mm，例如15mm、16mm、17mm、18mm、19mm、20mm。
为进一步提高弧形板23对光线的扩散效果，从而消除暗角和暗区问题，弧形板23上还可以涂布有扩散粒子，扩散粒子可以使光线在弧形板23上发生漫反射，可以将传播空间内规律分布的光能打散，从而将光能均匀输送至扩散板4的边缘区域，同步优化暗角和暗区。在一实施例中，扩散粒子可以由聚甲基丙烯酸甲酯(Polymethyl Methacrylate，PMMA)或聚甲基丙烯酸正丁酯(Poly-n-butyl Methacrylate，PBMA)制成。为提高扩散粒子的漫反射效果，扩散粒子的半径不宜过大，也不宜过小。当扩散粒子的半径过大时，弧形板23上相邻的扩散粒子之间的间隙较小，导致扩散粒子对光线的散射效果较差；当扩散粒子的半径过小时，加工难度较大。在一实施例中，扩散粒子的半径可以为10μm-30μm，例如10μm、12μm、14μm、16μm、18μm、20μm、22μm、24μm、26μm、28μm、30μm。
在其他实施例中，扩散粒子的材质以及扩散粒子的半径也可以根据实际需要调整。
弧形板23上扩散粒子的浓度分布可以根据需要调整，不同浓度对光线的反射效果不同。实际生产中，可以根据暗区以及暗角的分布调整弧形板23上对应位置处扩散粒子的浓度。
本实施例中，扩散粒子的浓度由弧形板23的中心沿周向向两端逐渐减小。例如，弧形板23的轮廓面上与其轴线平行的直线上各点扩散粒子的浓度可以相等，弧形板23上沿周向延伸的圆弧线上各点扩散粒子的浓度不等，且两端的浓度小于中间的浓度。弧形板23接收到的光能由中间区域向两端边缘逐渐减小，增大弧形板23中间区域内扩散粒子的浓度，可以将光能向两端扩散，使得光线分布均匀，有利于扩散板4表面各区域内接收的光能更加均匀，从而改善视效。
在一实施例中，图8为弧形板23的横截面，该横截面的外轮廓线包括圆弧线，以圆弧线的两端之间的连线D＇E＇作为X轴，以经过圆弧线的中点C且 与D＇E＇垂直的直线为Y轴建立坐标系，则弧形板23上沿周向分布的弧线上各点扩散粒子的浓度分布如图9所示，浓度分布曲线满足下式：
y＝k|x| -m+h；
其中，k和m为常数，h为扩散粒子的最小直径。常数k和m影响浓度分布曲线的曲率，通过调整k和m的数值，可以调整扩散板4角落以及边缘区域内接受的光能的均匀性，k和m的具体数值可以通过软件模拟计算，以满足不同型号背光模组的设计需要。
为进一步改善扩散粒子浓度分布对光线均匀性的影响，还可以通过软件微调，调整浓度分布曲线顶部的曲率，使得顶部曲线更加平滑，即使得扩散板4上在轴向对称中心线两侧区域内扩散粒子的浓度分布更加均匀，有利于提高经扩散粒子打散后的光能分布的均匀性，从而提高优化暗区和暗角的效果。

Claims (15)

  1. 一种反射片，包括第一底板(21)以及环绕所述第一底板(21)边缘设置的第一斜板(22)，所述第一底板(21)与所述第一斜板(22)之间通过弧形板(23)连接，所述弧形板(23)设置为沿远离所述第一斜板(22)的方向凸设。
  2. 如权利要求1所述的反射片，其中，所述弧形板(23)上涂布有扩散粒子。
  3. 如权利要求2所述的反射片，其中，所述扩散粒子由聚甲基丙烯酸甲酯或聚甲基丙烯酸正丁酯制成。
  4. 如权利要求2所述的反射片，其中，所述扩散粒子的半径为10μm-30μm。
  5. 如权利要求2所述的反射片，其中，所述扩散粒子的浓度由所述弧形板(23)的中心向弧形两端逐渐减小。
  6. 如权利要求5所述的反射片，其中，以所述弧形板(23)的弧形外轮廓线的两端之间的连线为X坐标轴、经过所述弧形外轮廓线的中心且垂直所述X坐标轴的直线为Y轴建立坐标系，则所述弧形外轮廓线上的所述扩散粒子的浓度公式为：y＝k|x| -m+h；
    其中，k和m为常数，h为扩散粒子的最小直径。
  7. 如权利要求1-6中任一项所述的反射片，还包括设置于所述弧形板(23)的第一端的第一连接板(232)和设置于所述弧形板(23)第二端的第二连接板(231)，所述第一连接板(232)与所述第一斜板(22)共面并抵接，所述第二连接板(231)与所述第一底板(21)共面并抵接；
    所述第一连接板(232)的长度为15mm-20mm，所述第二连接板(231)的长度为15mm-20mm。
  8. 如权利要求1-6中任一项所述的反射片，还包括设置于所述弧形板(23)第一端的第一连接板(232)和设置于所述弧形板(23)第二端的第二连接板(231)，所述第一连接板(232)部分搭接在所述第一斜板(22)上，所述第二连接板(231)部分搭接在所述第一底板(21)上；
    所述第一连接板(232)的长度为15mm-20mm，所述第二连接板(231)的长度为15mm-20mm。
  9. 如权利要求7所述的反射片，其中，所述第一底板(21)上设置有使透 镜(31)穿过的通孔，所述通孔的半径为R，所述弧形板(23)与所述第二连接板(231)的连接处与靠近所述第一底板(21)边缘的所述通孔的中心轴线之间的距离为L3+R，所述第一底板(21)和所述第一斜板(22)的延长线交点到靠近所述第一底板(21)边缘的所述通孔的中心轴线之间的距离为L1+R，其中，
    Figure PCTCN2019094264-appb-100001
    所述第一斜板(22)与所述第一连接板(232)的长度和为L4，所述第一斜板(22)远离所述弧形板(23)的一端到所述第一斜板(22)与所述第一底板(21)的延长线交点的长度为L2，其中，
    Figure PCTCN2019094264-appb-100002
  10. 如权利要求9所述的反射片，其中，所述第一连接板(232)的长度为L6，所述第二连接板(231)的长度为L5，
    Figure PCTCN2019094264-appb-100003
  11. 如权利要求7所述的反射片，其中，所述弧形板(23)和所述第一连接板(232)的连接处与所述第二斜板(12)之间的距离、所述弧形板(23)和所述第二连接板(231)的连接处与所述第二底板(11)之间的距离均为所述弧形板(23)的厚度。
  12. 一种背光模组，包括背板，所述背板包括第二底板(11)以及环绕所述第二底板(11)边缘设置的第二斜板(12)，其中，所述背光模组还包括如权利要求1-11中任一项所述的反射片，所述第一底板(21)叠放于所述第二底板(11)上，所述第一斜板(22)叠放于所述第二斜板(12)上。
  13. 如权利要求12所述的背光模组，其中，所述第二斜板(12)的顶端延伸有与所述第二底板平行的折边。
  14. 如权利要求12所述的背光模组，其中，所述第一连接板(232)的端面与所述第一斜板(22)的端面对齐并抵接，所述第一连接板(232)通过胶或螺钉与所述背板固定，所述第一斜板(22)通过胶或螺钉与所述背板固定，所述第二连接板(231)的端面与所述第一底板(21)的端面对齐并抵接，所述第二连接板(231)通过胶或螺钉与所述背板固定，所述第一底板(21)通过胶或螺钉与所述背板固定。
  15. 一种显示设备，包括如权利要求12所述的背光模组。
PCT/CN2019/094264 2018-12-14 2019-07-01 一种反射片、背光模组及显示设备 Ceased WO2020119087A1 (zh)

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