WO2012006800A1 - 背光模块及显示装置 - Google Patents

背光模块及显示装置 Download PDF

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Publication number
WO2012006800A1
WO2012006800A1 PCT/CN2010/076247 CN2010076247W WO2012006800A1 WO 2012006800 A1 WO2012006800 A1 WO 2012006800A1 CN 2010076247 W CN2010076247 W CN 2010076247W WO 2012006800 A1 WO2012006800 A1 WO 2012006800A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
intermediate groove
light
backlight module
Prior art date
Application number
PCT/CN2010/076247
Other languages
English (en)
French (fr)
Inventor
曹谦
郭仪正
方扩军
Original Assignee
深圳市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 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US12/996,295 priority Critical patent/US8842067B2/en
Publication of WO2012006800A1 publication Critical patent/WO2012006800A1/zh

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0058Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the present invention relates to a backlight module and a display device, and more particularly to a backlight module and a display device that can adjust the light intensity distribution and enhance the central brightness of the picture.
  • Liquid crystal displays have been widely used in various electronic products.
  • Most of the liquid crystal displays are backlight type liquid crystal displays, which are composed of a liquid crystal display panel and a backlight module.
  • the backlight module can be divided into a side-light type and a direct-light type according to the incident position of the light source to provide a backlight to the liquid crystal display panel.
  • the center brightness is an important parameter.
  • the central brightness of a liquid crystal display can be improved by increasing the brightness of a backlight (such as a light emitting diode) of a backlight module.
  • this method tends to increase power consumption and increase unnecessary energy consumption.
  • a main object of the present invention is to provide a backlight module.
  • the backlight module includes:
  • a light guide plate having a bottom surface, wherein the bottom surface is formed with an intermediate groove, the intermediate groove has two dimming bevels, wherein each of the dimming bevels has a predetermined angle between the adjacent bottom surfaces, It is greater than 90 degrees;
  • a plurality of light sources are disposed on opposite sides of the light guide plate and correspond to the dimming slope.
  • Another object of the present invention is to provide a display device, the display device comprising:
  • the backlight module includes:
  • a light guide plate having a bottom surface, wherein the bottom surface is formed with an intermediate groove, the intermediate groove has two dimming slopes, wherein each of the dimming slopes has a predetermined angle between the bottom surface and the adjacent bottom surface, It is greater than 90 degrees;
  • a plurality of light sources are disposed on opposite sides of the light guide plate and correspond to the dimming slope.
  • the bottom surface of the light guide plate is provided with a microstructure.
  • the dimming slope is an inclined plane.
  • the dimming slope is an inclined curved surface.
  • the light intensity distribution of the light guide plate is based on a distance between a top end of the intermediate groove and a light exit surface of the intermediate groove, an opening width of the intermediate groove, and the dimming Adjust the surface shape of the bevel.
  • the light intensity distribution of the light guide plate is based on an apex angle of the intermediate groove, a top end of the intermediate groove, and a light exit surface of the intermediate groove The distance and the height between the bottom surface of the light guide plate and the reflective layer are adjusted.
  • the intermediate groove has a triangular shape in cross section.
  • the dimming bevel of the intermediate groove is provided with a microstructure.
  • the intermediate groove has a trapezoidal shape in cross section.
  • the light intensity distribution of the light guide plate is based on the preset angle, a distance between a top surface of the intermediate groove and a light exit surface of the intermediate groove, and a position of the light guide plate. The height between the bottom surface and the reflective layer and the bottom width of the trapezoidal cross section of the intermediate groove are adjusted.
  • the backlight module and the display device of the present invention can adjust the light intensity distribution correspondingly to improve the backlight effect of the backlight module and the display quality of the display device.
  • the light intensity distribution of the light guide plate (that is, the brightness distribution of the backlight module) can be easily controlled or adjusted by adjusting the relevant parameters of the intermediate groove.
  • the backlight module and the display device of the present invention can utilize the intermediate groove design of the light guide plate to enhance the central brightness of the picture without additional power output, that is, the invention can reduce unnecessary power consumption to save energy.
  • the intermediate groove surface of the light guide plate may be formed with a micro structure to further improve the brightness distribution of the backlight module and the display device to which the backlight is applied.
  • FIG. 1 is a cross-sectional view showing a backlight module and a display panel in accordance with a first embodiment of the present invention
  • FIG. 2 is a schematic view showing a light guide plate in accordance with a first embodiment of the present invention
  • 3 is a schematic view showing a light guide plate according to a second embodiment of the present invention
  • FIG. 4A is a cross-sectional view showing a backlight module according to a third embodiment of the present invention
  • FIG. 4B is a schematic view showing a light guide plate according to a third embodiment of the present invention
  • FIG. 5 is a schematic view showing a light guide plate according to a fourth embodiment of the present invention
  • FIG. 6A is a cross section of a backlight module according to a fifth embodiment of the present invention.
  • FIG. 6B is a schematic view showing a light guide plate according to a fifth embodiment of the present invention.
  • Figure 7 shows a schematic view of a light guide plate in accordance with a six embodiment of the present invention. detailed description
  • the backlight module 100 of the present embodiment can be, for example, a laterally-lit backlight module that is disposed relative to a display panel 101 (eg, a liquid crystal display panel) to form a display device (eg, a liquid crystal display device).
  • the backlight module 100 includes a back plate 110, a plurality of light sources 120, a light guide plate 130, and a reflective layer 140.
  • Optical film 150 is used to mount the light source 120, the light guide plate 130, the reflective layer 140, and the optical film 150.
  • the light source 120 is disposed on opposite sides of the light guide plate 130 for laterally emitting light into the light guide plate 130, and is guided by the light guide plate 130.
  • the reflective layer 140 is disposed at the bottom of the light guide plate 130 for reflecting light entering the light guide plate 130.
  • the optical film 150 is disposed on the light guide plate 130 to improve the optical effect.
  • the back sheet 1 10 of the present embodiment is made of an opaque material such as a plasticized material, a metal material or a combination of the above materials.
  • the light source 120 is, for example, a Cold Cathode Fluorescent Lamp (CCFL), a Light Emitting Diode (LED), an Organic Light Emitting Diode (OLED), and an Electro-Luminescence (EL). , Light B ar or any combination of the above.
  • the light source 120 can be, for example, a light strip, which includes a circuit board 102 and a plurality of light emitting components 103 (eg, LED chips), and the circuit board 102 is, for example, a printed circuit.
  • a printed circuit board (PCB) or a Flexible Printed Circuits (FPC) is provided on the circuit board 102.
  • the light guide plate 130 of the present embodiment is produced, for example, by injection molding, and the material thereof is, for example, a photocurable resin, polymethyl methacrylate (PMMA) or polycarbonate (PC).
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • FIG. 2 shows a schematic view of a light guide plate according to a first embodiment of the present invention.
  • the light guide plate 130 of the embodiment includes a light emitting surface 13 1 and a bottom surface 132 And an intermediate groove 133.
  • the light-emitting surface 13 1 is a side on which the light guide plate 130 is formed and faces the display panel 101.
  • the light-emitting surface 13 1 may have a matte surface treatment or a scattering point design (not shown) to uniformize the light output of the light guide plate 130 to reduce the phenomenon of light emission unevenness (Mura).
  • the light-emitting surface 13 1 may also be provided with a plurality of protruding structures (not shown) to further correct the direction of the light to increase the light collecting effect and improve the front luminance.
  • the protruding structures can be, for example, prismatic or semi-circular.
  • the bottom surface 132 is opposite to the other side on which the light guide plate 130 is formed.
  • the light guide plate 130 has a flat plate shape.
  • the bottom surface 132 may be provided with a microstructure 134 for guiding the light to be emitted from the light exit surface 13 1 .
  • the microstructure 134 of the bottom surface 132 is, for example, a continuous V-shaped structure, that is, a V-Cut structure (for example, formed by injection molding or micro-cutting), and a matte structure (for example, formed by a blasting process). Or a scattering point structure (for example, formed by screen printing, laser fine processing, or integral molding), so that light entering from the light guide plate 130 can be sufficiently emitted from the light exit surface 13 1 . Furthermore, the microstructures 134 are gradually increased in density from the outside (i.e., from the sides to the intermediate grooves 133), but are not formed in the intermediate grooves 133.
  • the intermediate groove 133 of the light guide plate 130 of the present embodiment is disposed at an intermediate position of the light guide plate 130 and is recessed on the bottom surface 132.
  • the intermediate groove 133 has two dimming bevels 135.
  • the dimming bevel 135 can be an inclined plane or a curved surface formed on both sides of the intermediate groove 133 and corresponding to the light source 120 for adjusting the light direction of the light source 120. And distribution.
  • each dimming ramp 135 and the adjacent bottom surface 132 have a predetermined angle ⁇ greater than 90 degrees, preferably substantially between 170 degrees and 100 degrees, such as 135 degrees.
  • the cross-sectional shape of the intermediate groove 133 is, for example, a triangle.
  • the dimming bevel 135 can be tilted.
  • An inclined plane is formed on both sides of the intermediate groove 133.
  • the intermediate groove 133 has an apex angle ⁇ 2 between the two dimming slopes 135 (which can be determined by a predetermined angle), and a distance d between the top end of the intermediate groove 133 and the light-emitting surface 13 1
  • a height 11 is defined between the bottom surface 132 of the light guide plate 130 and the reflective layer 140.
  • the reflective layer 140 of the present embodiment is, for example, a reflective film or a reflective coating having a high reflectivity material for reflecting light emitted by the bottom surface 132 of the light guide plate 130.
  • the high reflectivity material may be, for example, silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination thereof, yellowing resistant and heat resistant.
  • the optical film 150 of the present embodiment can be, for example, a diffusion sheet, a prism sheet, a Turning Prism Sheet, a Brightness s Enhancement Film (BEF), and a reflective brightness enhancing film ( Dual Brightness Enhancement Film (DBEF), Diffu sed Reflective Polarizer Film (DRPF), or any combination thereof, which is disposed on the light-emitting surface 13 1 of the light guide plate 130 for improving the light guide plate. 130 optical effects of light.
  • BEF Brightness s Enhancement Film
  • DBEF Dual Brightness Enhancement Film
  • DRPF Diffu sed Reflective Polarizer Film
  • the light source 120 on the opposite sides of the light guide plate 130 can emit light into the light guide plate 130, and the light of the light source 120 is guided by the light guide plate 130 to the display panel 101.
  • the light intensity distribution guided by the light guide plate 130 can be adjusted through the intermediate groove 133 to achieve The effect or brightness of the desired period.
  • the dimming bevel 135 of the intermediate groove 133 of the light guide plate 130 can correspond to the light of the reflective light source 120 to the light emitting surface 13 1 , and can enhance the brightness of the light in the middle portion of the light guide plate 130 , thereby improving the backlight module 100 and The brightness of the middle area of the applied display device.
  • the relevant parameters ⁇ 2 , d and h of the intermediate groove 133 the light intensity distribution of the light guide plate 130 can be arbitrarily controlled.
  • the backlight module 100 of the present embodiment and the display device thereof can use the intermediate groove 133 of the light guide plate 130 to adjust the light intensity distribution to improve the backlight effect of the backlight module and the display quality of the display device.
  • the dimming bevel 235 of the intermediate recess 233 of the second embodiment can also be provided with a microstructure 234, that is, the microstructure 234 can be formed on the bottom surface 132 of the light guide plate 130 and the dimming slope 235.
  • This microstructure 234 can be, for example, a continuous V-shaped structure, a matte structure, or a scattering point structure.
  • the microstructure 234 is gradually increased in density from the outside (i.e., from the sides to the intermediate groove 233).
  • FIG. 4A is a cross-sectional view showing a backlight module according to a third embodiment of the present invention
  • FIG. 4B is a schematic view showing a light guide plate according to a third embodiment of the present invention.
  • the cross-sectional shape of the intermediate groove 333 of the third embodiment is, for example, a trapezoid
  • the intermediate groove 333 has a dimming bevel 335 and a top surface 336, and the dimming bevel 335 can be an inclined plane.
  • the opposite sides of the top surface 336 are formed.
  • the dimming slope 335 and the bottom surface 1 32 have a predetermined angle ⁇ .
  • the top surface 336 of the intermediate groove 333 has a distance d between the bottom surface 132 and the light-emitting surface 13 1 .
  • the bottom surface 132 of the light guide plate 130 and the reflective layer 140 have a gap between the bottom surface 132 and the light-emitting surface 13 1 .
  • the height h, the bottom width of the trapezoidal section of the intermediate groove 333 (that is, the opening width of the intermediate groove) is L. Therefore, when the light guide plate 130 is used to guide the light of the light source 120, the light intensity distribution of the light emitted by the light guide plate 130 can be controlled by adjusting these parameters ⁇ ⁇ d, h and L.
  • the cross-sectional shape of the intermediate groove 433 of the fourth embodiment is, for example, a trapezoid, and the intermediate groove 433 has a dimming bevel 435 and a top surface 436, and the dimming bevel 435 may be an inclined plane to form On opposite sides of the top surface 436.
  • the dimming bevel 435 and the top surface 436 of the intermediate recess 433 may also be provided with a microstructure 434, that is, the microstructure 434 may be formed on the bottom surface 132 of the light guide plate 130, the dimming slope 435 and the top surface 436 to further improve The brightness distribution of the backlight module 100.
  • This microstructure 434 can be, for example, a continuous V-shaped structure, a matte structure, or a scattering point structure.
  • the microstructure 434 is gradually increased in density from the outside to the inside (i.e., from the sides to the intermediate groove 433).
  • FIG. 6A is a cross-sectional view showing a backlight module according to a fifth embodiment of the present invention
  • FIG. 6B is a schematic view showing a light guide plate according to a fifth embodiment of the present invention.
  • the dimming slope 535 of the intermediate groove 533 of the fifth embodiment may be a curved surface formed in the middle. The opposite sides of the groove 533 are respectively tangent to the bottom surface 132 at two points t, t '.
  • the light guide plate 130 when the light guide plate 130 is used to guide the light of the light source 120, the light intensity distribution of the light emitted by the light guide plate 130 can be controlled by adjusting the curved shapes of the d, L and the dimming slope 535.
  • the dimming slope 635 of the intermediate groove 633 of the sixth embodiment may be a curved surface, and may be provided with a microstructure 634, that is, the microstructure 634 may be formed on the bottom surface 132 of the light guide plate 130 and adjusted.
  • the light slope 635 is used to further improve the brightness distribution of the backlight module 100.
  • This microstructure 634 can be, for example, a continuous V-shaped structure, a matte structure, or a scattering point structure.
  • the microstructure 634 is gradually increased in density from the outside to the inside (i.e., from the sides to the intermediate groove 633).
  • the backlight module and the display device of the present invention can adjust the light intensity distribution by using the intermediate groove of the light guide plate to improve the backlight effect of the backlight module and the display quality of the display device.
  • the intermediate groove of the light guide plate may have any sectional shape, such as a triangle, a trapezoid or a polygon.
  • the light intensity distribution of the light guide plate can be controlled or adjusted by adjusting the relevant parameters of the middle groove.
  • the backlight module and the display device of the present invention can use the intermediate groove design of the light guide plate to easily increase the central brightness of the picture without additional power output, and thus, compared to the existing central brightness increase mode, The invention can reduce unnecessary power consumption Fees to save energy.
  • the intermediate groove surface of the backlight module light guide plate of the present invention can be further formed with a microstructure to further improve the brightness distribution of the backlight module and the display device to which the backlight device and the application are applied.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种背光模块及显示装置。显示装置包括此背光模块和显示面板(101)。此背光模块包括光源(120)和其底面(132)形成有中间凹槽(133)的导光板(130),中间凹槽(133)具有调光斜面(135)。光源(120)设置于导光板(130)的相对两侧,并对应于调光斜面(135)。

Description

技术领域
本发明涉及一种背光模块及显示装置,特别是涉及一种可调 整光线强度分布并可提升画面的中央亮度的背光模块及显示装 置。
液晶显示器(Liquid Crystal Display , LCD)已被广泛应用于各 种电子产品中, 液晶显示器大部分为背光型液晶显示器, 其是由 液晶显示面板及背光模块(backlight module)所组成。 背光模块可 依照光源入射位置的不同分成侧向式入光(Side-light type)与直 下式入光(Direct-light type)两种, 以便提供背光源至液晶显示面 板。
通常, 对于液晶显示器, 其中心亮度是一项重要的参数。 一 般, 液晶显示器的中心亮度提升可通过提高背光模块的背光源 (如发光二极管)的亮度来实现。 然而, 此种方式容易增加功率耗 费, 而增加不必要的能量耗费。
故, 有必要提供一种背光模块及显示装置, 以解决现有技术 所存在的问题。 发明内容
本发明的主要目的在于提供一种背光模块。 所述背光模块包括:
导光板, 具有底面, 且所述底面形成有中间凹槽, 所述中间凹槽 具有二个调光斜面, 其中每一所述调光斜面与相邻所述底面之间 具有一预设角度, 其大于 90度; 以及
若干个光源, 设置于所述导光板的相对两侧, 并对应于所述 调光斜面。
本发明的另一目的在于提供一种显示装置,所述显示装置包 括:
显示面板; 以及
背光模块, 包括:
导光板, 具有底面, 且所述底面形成有中间凹槽, 所述中 间凹槽具有二个调光斜面,其中每一所述调光斜面与相邻所 述底面之间具有一预设角度, 其大于 90度; 以及
若干个光源, 设置于所述导光板的相对两侧, 并对应于 所述调光斜面。
在一实施例中, 所述导光板的所述底面设有微结构。
在一实施例中, 所述调光斜面为倾斜的平面。
在一实施例中, 所述调光斜面为倾斜的曲面。
在一实施例中,所述导光板的光线强度分布是依据所述中间 凹槽的顶端与所述中间凹槽的出光面之间的距离、所述中间凹槽 的开口宽度以及所述调光斜面的曲面形状来调整。
在一实施例中,所述导光板的光线强度分布是依据所述中间 凹槽的顶角、所述中间凹槽的顶端与所述中间凹槽的出光面之间 的距离以及所述导光板的所述底面与反射层之间的高度来调整。 在一实施例中, 所述中间凹槽的剖面形状为三角形。
在一实施例中, 所述中间凹槽的所述调光斜面设有微结构。 在一实施例中, 所述中间凹槽的剖面形状为梯形。
在一实施例中,所述导光板的光线强度分布是依据所述预设 角度、 所述中间凹槽的顶面与所述中间凹槽的出光面之间的距 离、所述导光板的所述底面与反射层之间的高度以及所述中间凹 槽的梯形剖面的底部宽度来调整。
本发明的背光模块和显示装置可对应调整光线强度分布, 以 改善背光模块的背光效果与显示装置的显示质量。 其中, 导光板 的光线强度分布(亦即背光模块的亮度分布)可简易地通过调整 中间凹槽的相关参数来进行控制或调整。 例如, 本发明的背光模 块和显示装置可利用导光板的中间凹槽设计来提升画面的中央 亮度, 而不需增加的额外功率输出, 亦即本发明可减少不必要的 功率耗费, 以节省能量。 且导光板的中间凹槽表面可形成有微结 构, 以进一步改善背光模块及其应用的显示装置的亮度分布。
为让本发明的上述内容能更明显易懂, 下文特举优选实施 例, 并配合所附图式, 作详细说明如下: 附图说明
图 1 显示依照本发明的第一实施例的背光模块与显示面板 的剖面示意图;
图 2显示依照本发明的第一实施例的导光板的示意图; 图 3显示依照本发明的第二实施例的导光板的示意图; 图 4A显示依据本发明的第三实施例的背光模块的剖面示意 图;
图 4B显示依据本发明的第三实施例的导光板的示意图; 图 5显示依照本发明的第四实施例的导光板的示意图; 图 6A显示依据本发明的第五实施例的背光模块的剖面示意 图;
图 6B显示依据本发明的第五实施例的导光板的示意图; 以 及
图 7显示依据本发明的六实施例的导光板的示意图。 具体实施方式
以下各实施例的说明是参考附加的图式,用以例示本发明可 用以实施的特定实施例。 本发明所提到的方向用语, 例如 「上」、 「下」、 「前」、 「后」、 「左」、 「右」、 「内」、 「外」、 「侧面」 等, 仅 是参考附加图式的方向。 因此, 使用的方向用语是用以说明及理 解本发明, 而非用以限制本发明。
在图中, 结构相似的单元是以相同标号表示。
请参照图 1, 其显示依照本发明的第一实施例的背光模块与 显示面板的剖面示意图。本实施例的背光模块 100可例如为侧向 式入光的背光模块,其相对于一显示面板 101 (例如液晶显示面板) 来设置, 而形成一显示装置(例如液晶显示装置)。 背光模块 100 包括有背板 110、 若干个光源 120、 导光板 130、 反射层 140 及 光学膜片 150。 背板 1 10 是用以装设光源 120、 导光板 130、 反 射层 140及光学膜片 150。 光源 120是设置于导光板 130的相对 两侧, 用以侧向发光至导光板 130 内, 并由导光板 130来导引出 光。 反射层 140是设置于导光板 1 30的底部, 用以反射进入导光 板 130 内的光线。 光学膜片 150是设置于导光板 130上, 以改善 光学效果。
如图 1所示, 本实施例的背板 1 10是由不透光材质所制成, 例如: 塑化材料、 金属材料或上述材料的组合。 光源 120例如为 冷阴极灯管(Cold Cathode Fluorescent Lamp , CCFL)、 发光二极 管 (Light Emitting Diode , LED) ^ 有机发光二极管 (Organic Light Emitting Diode , OLED) ^ 电激发光组件 (Electro-Luminescence, EL)、 发光灯条(Light B ar)或上述的任意组合。 如图 1 所示, 在本实施例中, 光源 120 可例如为发光灯条 (Light B ar) , 其包括电路板 102 和多个发光组件 103 (例如 LED 芯片), 电路板 102例如为印刷电路板(Printed circuit board , PCB ) 或软性印刷电路板(Flexible Printed Circuits , FPC),发光组件 103 是设置电路板 102上。 如图 1所示, 本实施例的导光板 130例如是利用射出成型的 方式来制成, 其材料例如为光硬化型树脂、 聚甲基丙烯酸甲酯 (PMMA)或聚碳酸酯(PC)。 导光板 130是设置于光源 120之间, 用以提供背光至显示面板 101。
请参照图 1和图 2, 图 2显示依照本发明的第一实施例的导 光板的示意图。本实施例的导光板 130包括出光面 13 1、底面 132 及中间凹槽 133。 出光面 13 1 是形成导光板 130的一侧, 并面对 显示面板 101。 出光面 13 1 可具有雾面处理或散射点设计(未绘 示), 以此均匀化导光板 130 的出光, 减少出光不均(Mura)的现 象。 在一实施例中, 出光面 13 1 还可设有复数个突出结构(未绘 示), 以此进一步修正光线的方向, 来增加聚光效果, 并提高正 面辉度。 其中此些突出结构可例如为: 棱形或半圆形。 底面 132 是形成导光板 130的相对另一侧。 在本实施例中, 导光板 130是 呈平板形结构, 此时, 底面 132可设有微结构 134, 以此导引光 线由出光面 13 1射出。底面 132的微结构 134例如是呈连续性的 V 形结构, 亦即 V-Cut 结构(例如是利用射出成型或微切削成型 的方式来形成)、雾面结构(例如是利用喷吵处理来形成)或散射点 结构(例如是利用网板印刷、 激光精细加工或一体成型来形成), 以此导引由导光板 130进入的光线可充分地由出光面 13 1射出。 再者, 微结构 134 是由外而内(亦即由两侧往中间凹槽 133 )逐渐 增高其分布密度, 但未形成在中间凹槽 133 内。
如图 1和图 2所示, 本实施例的导光板 130的中间凹槽 133 是设于导光板 130的中间位置, 且凹设于底面 132上。 此中间凹 槽 133具有二个调光斜面 135, 调光斜面 135可为倾斜的平面或 曲面, 其形成于中间凹槽 133 的两侧, 并对应于光源 120, 用以 调整光源 120的光线方向及分布。 其中, 每一调光斜面 135与相 邻底面 132之间具有一预设角度 Θ 其大于 90度, 优选是实质 介于 170度与 100度之间, 例如 135度。 在本实施例中, 此中间 凹槽 133 的剖面形状例如为三角形, 因此, 调光斜面 135可为倾 斜平面, 而形成于中间凹槽 133 的两侧。 此时, 中间凹槽 133在 二调光斜面 135 之间具有一顶角 θ 2 (可通过预设角度 Θ 工来决 定), 中间凹槽 133 的顶端与出光面 13 1之间具有一距离 d, 导光 板 130 的底面 132与反射层 140之间具有一高度11。 当利用导光 板 130来导引光源 120的光线时, 可通过调整这些参数 Θ 2、 d及 h来控制导光板 130所出光的光线强度分布。
如图 1所示, 本实施例的反射层 140例如为反射膜片或反射 涂层, 其具有高反射率材料, 用以反射由导光板 130底面 132所 穿射出的光线。 此高反射率材料可例如为银、 铝、 金、 铬、 铜、 铟、 铱、 镍、 铂、 铼、 铑、 锡、 钽、 钨、 锰、 上述任意组合的合 金、 耐黄化且耐热之白色反射漆料或上述材料的任意组合, 以反 射光线。
如图 1所示, 本实施例的光学膜片 150可例如为扩散片、 棱 镜 片 、 逆 棱 镜 片 (Turning Prism Sheet) 、 增 亮 膜 (Brightnes s Enhancement Film, BEF)、 反射式增亮膜 (Dual Brightness Enhancement Film , DBEF)、 非多层膜式反射偏光片(Diffu sed Reflective Polarizer Film , DRPF)或上述的任意组合, 其设置于 导光板 130的出光面 13 1上,用以改善由导光板 130出光的光学 效果。
当背光模块 100提供背光至显示面板 101 时, 在导光板 130 的相对两侧的光源 120可发出光线至导光板 130 内, 并由导光板 130 来导引光源 120 的光线至显示面板 101。 此时, 导光板 130 所导引的光线强度分布可通过中间凹槽 133来进行调整, 以达成 欲期的效果或亮度。 例如, 导光板 130的中间凹槽 133 的调光斜 面 135可对应反射光源 120的光线至出光面 13 1, 而可提升导光 板 130的中间区域的出光亮度,亦即可提升背光模块 100及其应 用的显示装置的中间区域亮度。 再者, 通过调整中间凹槽 133 的 相关参数 θ 2、 d及 h, 即可任意地控制导光板 130 的光线强度分 布。
因此, 本实施例背光模块 100及其应用的显示装置可利用导 光板 130的中间凹槽 133来对应调整光线强度分布, 以改善背光 模块的背光效果与显示装置的显示质量。
请参照图 3, 其显示依据本发明的第二实施例的导光板的示 意图。 以下仅就本实施例与第一实施例间的相异处进行说明, 而 其相似处则在此不再赘述。 相较于第一实施例, 第二实施例的中 间凹槽 233的调光斜面 235亦可设有微结构 234,亦即微结构 234 可形成于导光板 130的底面 132及调光斜面 235上, 以进一步改 善背光模块的 100的亮度分布。此微结构 234可例如为连续性的 V形结构、 雾面结构或散射点结构。 再者, 微结构 234是由外而 内(亦即由两侧往中间凹槽 233 )逐渐增高其分布密度。
请参照图 4A和图 4B , 图 4A显示依据本发明的第三实施例 的背光模块的剖面示意图, 图 4B显示依据本发明的第三实施例 的导光板的示意图。 以下仅就本实施例与第一实施例间的相异处 进行说明, 而其相似处则在此不再赘述。 相较于第一实施例, 第 三实施例的中间凹槽 333 的剖面形状例如为梯形, 此中间凹槽 333具有调光斜面 335和顶面 336, 调光斜面 335可为倾斜平面, 而形成于顶面 336的相对两侧。 此时, 调光斜面 335与底面 1 32 之间具有预设角度 θ 中间凹槽 333 的顶面 336 与出光面 13 1 之间具有距离 d, 导光板 130 的底面 132与反射层 140之间具有 高度 h, 中间凹槽 333 的梯形剖面的底部宽度(亦即中间凹槽的开 口宽度)为 L。因此,当利用导光板 130来导引光源 120的光线时, 可通过调整这些参数 Θ ^ d、 h及 L来控制导光板 130所出光的光 线强度分布。
请参照图 5, 其显示依据本发明的第四实施例的导光板的示 意图。 以下仅就本实施例与第一实施例间的相异处进行说明, 而 其相似处则在此不再赘述。 相较于第一实施例, 第四实施例的中 间凹槽 433 的剖面形状例如为梯形, 此中间凹槽 433具有调光斜 面 435和顶面 436, 调光斜面 435可为倾斜平面, 而形成于顶面 436的相对两侧。 此中间凹槽 433 的调光斜面 435和顶面 436也 可设有微结构 434, 亦即微结构 434可形成于导光板 130的底面 132、 调光斜面 435 及顶面 436 上, 以进一步改善背光模块 100 的亮度分布。 此微结构 434 可例如为连续性的 V 形结构、 雾面 结构或散射点结构。 再者, 微结构 434 是由外而内(亦即由两侧 往中间凹槽 433 )逐渐增高其分布密度。
请参照图 6A和图 6B , 图 6A显示依据本发明的第五实施例 的背光模块的剖面示意图, 图 6B显示依据本发明的第五实施例 的导光板的示意图。 以下仅就本实施例与第一实施例间的相异处 进行说明, 而其相似处则在此不再赘述。 相较于第一实施例, 第 五实施例的中间凹槽 533 的调光斜面 535可为曲面, 形成于中间 凹槽 533 的相对两侧, 并分别与底面 132相切于两点 t、 t '。 此 时, 两点 t-t ' 之间具有距离 L (亦即中间凹槽的开口宽度), 中间 凹槽 533 的顶点与出光面 13 1之间具有距离 d。 因此, 当利用导 光板 130来导引光源 120 的光线时, 可通过调整这些 d、 L 以及 调光斜面 535的曲面形状来控制导光板 130所出光的光线强度分 布。
请参照图 7, 其显示依据本发明的第六实施例的导光板的示 意图。 以下仅就本实施例与第一实施例间的相异处进行说明, 而 其相似处则在此不再赘述。 相较于第一实施例, 第六实施例的中 间凹槽 633 的调光斜面 635可为曲面, 且可设有微结构 634, 亦 即微结构 634可形成于导光板 130的底面 132及调光斜面 635上, 以进一步改善背光模块的 100的亮度分布。此微结构 634可例如 为连续性的 V 形结构、 雾面结构或散射点结构。 再者, 微结构 634 是由外而内(亦即由两侧往中间凹槽 633 )逐渐增高其分布密 度。
由上述可知, 本发明的背光模块和显示装置可利用导光板的 中间凹槽来对应调整光线强度分布, 以改善背光模块的背光效果 与显示装置的显示质量。 其中, 导光板的中间凹槽可具有任意剖 面形状, 例如三角形、 梯形或多边形等。 且导光板的光线强度分 布可通过调整中间凹槽的相关参数来进行控制或调整。 例如, 本 发明的背光模块和显示装置可利用导光板的中间凹槽设计来简 易地提升画面的中央亮度, 而不需增加的额外功率输出, 因此, 相较于现有的中央亮度增加方式, 本发明可减少不必要的功率耗 费, 以节省能量。 且本发明的背光模块导光板的中间凹槽表面更 可形成有微结构, 以进一步改善背光模块及其应用的显示装置的 亮度分布。
综上所述, 虽然本发明已以优选实施例揭露如上, 但上述优 选实施例并非用以限制本发明, 本领域的普通技术人员, 在不脱 离本发明的精神和范围内, 均可作各种更动与润饰, 因此本发明 的保护范围以权利要求界定的范围为准。

Claims

权 利 要 求
1 .一种显示装置, 其特征在于: 所述显示装置包括: 显示面板; 以及
背光模块, 包括:
导光板, 具有底面, 且所述底面形成有中间凹槽, 所述中 间凹槽具有二个调光斜面,其中每一所述调光斜面与相邻所 述底面之间具有一预设角度, 其大于 90度; 以及
若干个光源, 设置于所述导光板的相对两侧, 并对应于 所述调光斜面
其中所述导光板的光线强度分布是依据所述中间凹槽 的顶角、所述中间凹槽的顶端与所述中间凹槽的出光面之间 的距离以及所述导光板的所述底面与反射层之间的高度来 调整。
2.—种显示装置, 其特征在于: 所述显示装置包括: 显示面板; 以及
背光模块, 包括:
导光板, 具有底面, 且所述底面形成有中间凹槽, 所述中 间凹槽具有二个调光斜面,其中每一所述调光斜面与相邻所 述底面之间具有一预设角度, 其大于 90度; 以及
若干个光源, 设置于所述导光板的相对两侧, 并对应于 所述调光斜面。
3.—种背光模块, 其特征在于: 所述背光模块包括: 导光板, 具有底面, 且所述底面形成有中间凹槽, 所述中间凹槽 具有二个调光斜面, 其中每一所述调光斜面与相邻所述底面之间 具有一预设角度, 其大于 90度; 以及
若干个光源, 设置于所述导光板的相对两侧, 并对应于所述 调光斜面。
4.根据权利要求 3所述的背光模块, 其特征在于: 所述导光 板的所述底面设有微结构。
5.根据权利要求 3所述的背光模块, 其特征在于: 所述调光 斜面为倾斜的平面。
6.根据权利要求 3所述的背光模块, 其特征在于: 所述调光 斜面为倾斜的曲面。
7.根据权利要求 6所述的背光模块, 其特征在于: 所述导光 板的光线强度分布是依据所述中间凹槽的顶端与所述中间凹槽 的出光面之间的距离、所述中间凹槽的开口宽度以及所述调光斜 面的曲面形状来调整。
8.根据权利要求 3所述的背光模块, 其特征在于: 所述导光 板的光线强度分布是依据所述中间凹槽的顶角、所述中间凹槽的 顶端与所述中间凹槽的出光面之间的距离以及所述导光板的所 述底面与反射层之间的高度来调整。
9.根据权利要求 3所述的背光模块, 其特征在于: 所述中间 凹槽的剖面形状为三角形。
10.根据权利要求 3 所述的背光模块, 其特征在于: 所述中 间凹槽的所述调光斜面设有微结构。
1 1 .根据权利要求 3 所述的背光模块, 其特征在于: 所述中 间凹槽的剖面形状为梯形。
12.根据权利要求 11所述的背光模块, 其特征在于: 所述导 光板的光线强度分布是依据所述预设角度、所述中间凹槽的顶面 与所述中间凹槽的出光面之间的距离、所述导光板的所述底面与 反射层之间的高度以及所述中间凹槽的梯形剖面的底部宽度来 调整。
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