WO2012058833A1 - 导光板以及背光模块 - Google Patents

导光板以及背光模块 Download PDF

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Publication number
WO2012058833A1
WO2012058833A1 PCT/CN2010/079205 CN2010079205W WO2012058833A1 WO 2012058833 A1 WO2012058833 A1 WO 2012058833A1 CN 2010079205 W CN2010079205 W CN 2010079205W WO 2012058833 A1 WO2012058833 A1 WO 2012058833A1
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Prior art keywords
dot
phosphor
light
led
guide plate
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Ceased
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PCT/CN2010/079205
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English (en)
French (fr)
Inventor
黄建发
林博瑛
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US12/997,473 priority Critical patent/US8702293B2/en
Publication of WO2012058833A1 publication Critical patent/WO2012058833A1/zh
Anticipated expiration legal-status Critical
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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
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means 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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a light guide plate and a backlight module including the same.
  • the liquid crystal of the liquid crystal display panel does not have the light-emitting property itself, in order to achieve the display effect, it is necessary to provide the liquid crystal display panel with a light source device, such as a backlight module, for providing a surface light source with sufficient brightness and uniform distribution to the liquid crystal display panel.
  • a light source device such as a backlight module
  • the backlight module comprises a light source, a light guide plate and some other necessary parts.
  • the light guide plate serves to guide the light transmission direction, so that the light is uniformly emitted from the light exit surface of the light guide plate, and the light source is, for example, a light emitting diode (LED).
  • LED light emitting diode
  • FIG. 1(a) and FIG. 1(b) wherein the structure of the LED comprises: yttrium aluminum garnet (YAG) phosphor 10 and blue LED chip 20, or contains red, green and blue (RGB).
  • the mechanism for producing white light mainly has the following four types: one, blue LED chip + yellow phosphor (such as YAG); two, blue LED chip + yellow phosphor + red phosphor; three, blue LED chip + green phosphor + red phosphor; four, UV LED chip + RGB phosphor.
  • the phosphor is typically coated directly onto the LED chip or evenly distributed throughout the packaging material of the LED itself.
  • the structure of the edge-lit backlight module is shown in Figure 2: several white-emitting LEDs
  • the light is introduced into the light guide plate 120 from the side of the light guide plate 120, and the light propagates through the total reflection in the light guide plate 120.
  • the light is incident on the mesh point 130 of the light guide plate, a part of the light is scattered by the scattering particles on the mesh point 130.
  • the light exit surface directly above the light guide plate 120 is emitted.
  • the phosphor coating method mainly includes the following disadvantages: First, the LED generates a large amount of heat during the illuminating process, and the accumulation of heat causes the phosphor coating portion to have a higher temperature, and the phosphor does not. High temperature resistance and accelerated aging; in addition, the reflection absorption loss of the phosphor on the light also reduces the luminous efficiency of the LED. Therefore, the LED of the coating method has the disadvantages of rapid degradation of light efficiency, large color drift with time, and low luminous efficiency. Please refer to FIG. 3 for the change of the luminous efficacy of the LED with temperature. In FIG.
  • the vertical axis represents the luminous efficacy
  • the horizontal axis represents the Celsius temperature
  • the square point represents the YAG phosphor
  • the dot represents the indium gallium nitride (InGaN) blue LED.
  • the inconsistency of such LEDs with changes in temperature efficacy is inconsistent with the high color requirements in the display field.
  • the object of the present invention is to prevent the phosphor from causing color shift and decreasing luminous efficiency due to accelerated aging of the LED chip.
  • the present invention adopts the following technical solutions:
  • a light guide plate includes a bottom surface, a light incident surface and a light exiting surface, wherein the light emitting surface is opposite to the bottom surface, the bottom surface includes a plurality of mesh points, and the light guide plate uses an LED as a light source, and the light emitted by the LED light source passes through The light incident surface of the light guide plate is incident, and the dot contains phosphor.
  • the invention also provides a backlight module, comprising a light guide plate and an LED light source, wherein the light guide plate comprises a bottom surface, a light incident surface and a light exit surface, wherein the light exit surface is opposite to the bottom surface, and the bottom surface comprises a plurality of dots.
  • the LED light source is disposed opposite to the light incident surface, and the mesh dot comprises a phosphor.
  • the LED is an ultraviolet LED
  • the dots are a single layer
  • the composition of the dots comprises a mixture of a red phosphor, a green phosphor, and a blue phosphor.
  • the dots further comprise scattering particles.
  • the LED is a blue LED
  • the dot is a single layer, and the composition of the dot comprises a phosphor and an ink containing scattering particles.
  • the phosphor is: a yellow phosphor; a mixture of a yellow phosphor and a red phosphor; or a mixture of a green phosphor and a red phosphor.
  • the LED is a blue LED
  • the dot is a single layer, and the dot is divided into an ink dot containing a scattering particle and a phosphor dot.
  • the ink dot is alternately arranged with a phosphor dot comprising: a mixture of a red phosphor and a green phosphor; or a mixture of a yellow phosphor and a red phosphor.
  • the ink dot containing the scattering particles and the dot of the phosphor are alternately arranged in such a manner that the ink dot row containing the scattering particles and the dot line of the phosphor are alternately arranged.
  • the ink dot size of the ink dot row is increased from the incident side of the light source.
  • the size of the phosphor dot of the phosphor dot row is increased from the incident side of the light source.
  • the dots closest to the incident side of the light source behave as ink dot rows.
  • the dot closest to the opposite side of the incident side of the light source acts as a phosphor dot row.
  • the dots are double-layered, the first layer is a phosphor dot, and the second layer is an ink dot comprising scattering particles.
  • composition of the phosphor used in the present invention contains an aluminate (for example, YAG), a silicate, a phosphate or a nitride.
  • the LED of the present invention is not coated with a phosphor inside.
  • the invention has the beneficial effects that since the LED of the invention is not coated with the phosphor inside, the phosphor is no longer close to the heat source, and the problem that the LED color change caused by the accelerated aging of the phosphor causes the light effect to be reduced is avoided; Because the optical structure of the light guide plate determines that all the light emitted from the light exit surface directly above the light guide plate must be scattered by the mesh particles at least once, so that the phosphor is added to the scattering particles, and on the one hand, the phosphor itself has a scattering effect, and the other one has a scattering effect. On the one hand, it can ensure that the scattered light can be mixed into a uniform color, thereby further improving the light guiding efficiency of the light guide plate.
  • 1(a) and 1(b) are schematic views showing the structure of an LED in the prior art.
  • FIG. 2 is a schematic structural view of a side-lit backlight module in the prior art.
  • FIG. 3 is a schematic view showing the change of the luminous efficacy of the LED with temperature in the prior art.
  • FIG. 4 is a schematic structural view of a side-lit backlight module of the present invention.
  • FIG. 5 is a schematic view showing a dot mixing of a phosphor and an ink in a specific embodiment of the present invention.
  • FIG. 6 is a schematic view showing a dot arrangement of ink dots and phosphor dots alternately in a second embodiment of the present invention.
  • Figure 7 is a schematic view showing a two-layered dot in a third embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the overall structure of the edge-lit backlight module of the present invention.
  • the edge-lit backlight module includes a plurality of LEDs 210 and a light guide plate 220.
  • the light guide plate 220 includes a bottom surface, a light incident surface and a light exit surface.
  • the light exit surface is opposite to the bottom surface, and the bottom surface includes a plurality of mesh points 230.
  • the light emitting surface is connected to the light incident surface.
  • the LED 210 is disposed on the side of the light guide plate 220 and disposed opposite to the light incident surface, and the light emitted from the LED 210 is incident through the light incident surface of the light guide plate 220.
  • the phosphor 210 is no longer coated with phosphors, and the light emitted by the LED 210 is directly emitted through a package lens of the LED 210 itself, that is, the LED chip is separated from the phosphor; meanwhile, the dots of the light guide 220 are disposed.
  • the dot material on the 230 is changed from ordinary scattering particles to containing phosphors, and the scattering particles are selectively added, so that the blue light or the UV light emitted from the LED 210 excites the phosphor on the dots 230 incident on the light guide plate 220 to mix the white light. Then, the light exiting surface directly scattered above the light guide plate 220 forms a uniform surface light source.
  • the present invention can include at least the following four solutions:
  • the LED uses a blue LED, and the dot component is a mixture of a phosphor and an ink containing scattering particles.
  • the components of the dots may comprise a phosphor and an ink containing scattering particles, and the phosphor may be:
  • the LED adopts a UV ultraviolet LED
  • the composition of the dot is a mixture of a red phosphor, a green phosphor and a blue phosphor.
  • the LED adopts a blue LED, and the dot is an ink dot containing the scattering particles alternately arranged with the phosphor dot, and the composition of the phosphor dot is:
  • the LED uses UV ultraviolet light LED, the dot is two layers, the first layer is a phosphor dot, and a mixture of red phosphor, green phosphor and blue phosphor is used; the second layer is an ink dot, and an ink containing scattering particles is used. It can be understood that when the dot is two layers, the LED can also adopt a blue LED, the first layer of the dot can be a yellow phosphor, and the second layer is an ink dot containing scattering particles.
  • the phosphor used in the present invention is a phosphor comprising an aluminate series phosphor, a silicate series phosphor, a phosphate series phosphor or a nitride series.
  • FIG. 5 in a specific embodiment of the present invention, a schematic diagram of a mixing scheme of a phosphor and an ink is adopted for the dot component, that is, the first scheme.
  • FIG. 5 includes an LED 310, a light guide plate 320, and a dot 330.
  • the composition of the dots 330 may be: a yellow phosphor and an ink containing scattering particles; or a yellow phosphor, a red phosphor, and an ink containing scattering particles; or a green phosphor, a red phosphor, and an ink containing scattering particles.
  • the size of the dots 330 is not clearly defined, and can be designed according to actual needs.
  • the diameter of the dot 330 may be 0.2 to 0.4 mm.
  • the minimum printing dot may be 0.2 mm, usually about 0.4 mm. Since the number of dots in a screen is very large, the structure of the dots in FIG. 5 is simplified.
  • the composition of the dot 330 may be a mixture of a red phosphor, a green phosphor, and a blue phosphor, that is, the foregoing scheme 2, in which it is not necessary to add a scattering particle.
  • the diameter and arrangement of the ink dots 330 are the same as those of the first embodiment, and are not described herein again.
  • the dot is alternately arranged with the ink dot and the phosphor dot, that is, the third scheme.
  • FIG. 6 includes an LED 410, a light guide plate 420, a phosphor dot 430a, and an ink dot 430b.
  • the alternate arrangement of the phosphor dots 430a and the ink dots 430b is alternately arranged in a row, that is, an ink dot row composed of a phosphor dot 430a and an ink dot 430b containing scattering particles.
  • the composition of the phosphor dot 430a is: a mixture of a red phosphor and a green phosphor; or a mixture of a yellow phosphor and a red phosphor.
  • the phosphor dot 430a and the ink dot 430b are arranged in the following manner: the light emitted by the light source LED 410 is incident on the incident side S1 of the light source.
  • the ink dot 430b containing the scattering particles and the phosphor dot 430a are alternately arranged in a row, and the ink dot 430b of the ink dot row is increased in size from the light source incident side S1, and the phosphor dot of the phosphor dot row is
  • the size of the 430a is increased from the incident side of the light source (ie, the other side of the incident side of the light source) S2 by a small increase, and a line of dots closest to the incident side S1 of the light source is the ink dot 430b, and the row closest to the incident side S2 of the light source is incident.
  • the dot is a phosphor dot 430a.
  • the blue light when the blue light is incident on the yellow phosphor, it is converted into yellow light, most of which will be emitted outside the light guide plate 420, and a small portion will propagate in the light guide plate 420 until it is scattered; the blue light is incident on the ink dot. After 430b, part of the light is scattered outside the light guide plate 420, and part of the light continues to propagate in the light guide plate 420; when the blue light is incident on the blank, it will be totally reflected and continue to propagate in the light guide plate 420.
  • the converted yellow light is incident on the ink dot 430b, partially reflected out of the light guide plate 420, and partially continues to propagate in the light guide plate 420; the yellow light is incident on the phosphor dot 430a, and is partially scattered out of the light guide plate 420, and the portion continues. Propagating within the light guide plate 420.
  • the blue light is incident on the phosphor dot 430a, and therefore, the color uniformity of the light of the light guide plate 420 is reflected in the constant ratio of the emitted blue light and the yellow light.
  • a larger phosphor dot 430a is required to mix the white light.
  • the proportion of yellow light inside the light guide plate 420 is continuously increased, so the proportion of blue light to yellow light needs to be reduced, that is, the phosphor dot 430a is reduced, and the ink dot 430b is reduced in size. It can be adjusted according to the brightness of the light guide plate 420.
  • FIG. 7 it is a schematic diagram of a network of two layers in the third embodiment of the present invention, that is, the foregoing scheme 4.
  • a light guide plate 520, a phosphor dot 530a, and an ink dot 530b are included.
  • the dots are divided into upper and lower layers, the upper layer is a phosphor dot 530a coated with a phosphor, and the lower layer is coated with an ink dot 530b containing scattering particles.
  • the phosphor dot 530a is a mixture of a red phosphor, a green phosphor, and a blue phosphor.
  • the present invention separates the LED from the phosphor, so that the phosphor is no longer coated inside the LED, thereby avoiding the problem that the LED color changes due to accelerated aging of the phosphor due to LED heat generation, thereby causing a decrease in light efficiency.
  • the method of adding phosphor to the scattering particles utilizes the scattering effect of the phosphor itself on the one hand, and ensures that the scattered light is mixed with a uniform color on the other hand, thereby improving the light guiding efficiency of the light guide plate.
  • the dot size of the light guide plate varies depending on the size of the dot pitch, the panel size, the printing process, and the type of the ink, and can be adjusted according to the design requirements of the specific product.
  • the size of the dot diameter of the light guide plate used for the backlight module is preferably about 0.4 mm to 1.4 mm.

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

Description

导光板以及背光模块 技术领域
本发明涉及液晶显示技术领域，特别是涉及一种导光板及包含此种导光板的背光模块。
背景技术
由于液晶显示面板的液晶本身不具有发光特性，因而，为达到显示效果，需要给液晶显示面板提供光源装置，如背光模块，其作用在于向液晶显示面板提供辉度充分且分布均匀的面光源。
现有技术中，背光模块都包含光源、导光板和一些其它必要部分，导光板的作用在于引导光线的传输方向，使光线由导光板的出光面均匀出射，光源例如采用发光二极管(LED)。其中，LED的结构如图1(a)及图1(b)所示，其中LED的结构包含：钇铝石榴石(YAG)荧光粉10及蓝光LED芯片20，或是包含红绿蓝(RGB)荧光粉30及UV（紫外光）LED芯片 40，其产生白光的机制主要有如下四种：一、蓝光LED芯片+黄色荧光粉(如YAG)；二、蓝光LED芯片+黄色荧光粉+红色荧光粉；三、蓝光LED芯片+绿色荧光粉+红色荧光粉；四、UV LED芯片+RGB荧光粉。荧光粉一般直接涂布覆盖在LED芯片上或者均匀分布在LED本身的封装材料中。
再者，侧光式背光模块结构如图2所示：数个发白光的LED 110从导光板120侧边把光导入导光板120，光在导光板120内通过全反射传播，当光线入射到导光板上的网点130时，有一部分光线将被网点130上的散射粒子散射并从导光板120正上方的出光面出射。
如上所述，现有技术中，荧光粉涂布方式主要包含如下缺点：首先，LED在发光过程中会产生大量的热量，热量的累积导致荧光粉涂布部分温度较高，而荧光粉又不耐高温而加速老化；此外，荧光粉对光的反射吸收损耗也降低了LED的发光效率。所以，此种涂布方式的LED存在光效下降快、颜色随时间漂移大、发光效率低等缺点。请参考图3中LED随温度的光效变化情况，图3中纵轴表示光效，横轴表示摄氏温度，方点表示YAG荧光粉，圆点表示氮化铟镓（InGaN）蓝色LED。如图3所示，这种LED随温度的光效变化所发生的不良情况与显示领域对颜色的高要求是相矛盾的。
 技术问题
本发明的目的在于避免荧光粉因为靠近LED芯片加速老化而导致色偏以及发光效率下降现象。
 技术解决方案
为实现上述目的，本发明采用如下技术方案：
一种导光板，包含底面、入光面及出光面，所述出光面与所述底面相对设置，所述底面包含若干网点，所述导光板采用LED作为光源，所述LED光源发出的光经由所述导光板的入光面入射，所述网点包含荧光粉。
本发明同时提供了一种背光模块，包含导光板与LED光源，所述导光板上包含底面、入光面及出光面，所述出光面与所述底面相对设置，所述底面包含若干网点，所述LED光源与所述入光面相对设置，所述网点包含荧光粉。
在本发明的一个实施例中，所述LED为紫外光LED，所述网点为单层，且所述网点的成分包含红色荧光粉、绿色荧光粉和蓝色荧光粉的混合物。
较佳地，所述网点还包含散射粒子。
在本发明的一个实施例中，所述LED为蓝光LED ，所述网点为单层，且所述网点的成分包含荧光粉与含有散射粒子的油墨。
较佳地，所述荧光粉为：黄色荧光粉；黄色荧光粉与红色荧光粉的混合物；或者绿色荧光粉与红色荧光粉的混合物。
在本发明的一个实施例中，所述LED为蓝光LED ，所述网点为单层，所述网点分为含有散射粒子的油墨网点与荧光粉网点。
较佳地，所述油墨网点与荧光粉网点交替排列，所述荧光粉网点包含：红色荧光粉和绿色荧光粉的混合物；或者黄色荧光粉和红色荧光粉的混合物。
较佳地，所述含有散射粒子的油墨网点与荧光粉网点交替排列的方式为含有散射粒子的油墨网点行与荧光粉网点行交替排列。
较佳地，所述油墨网点行的油墨网点尺寸自光源入射侧起由小增大。
较佳地，所述荧光粉网点行的荧光粉网点尺寸自光源入射相对侧起由小增大。
较佳地，距光源入射侧最近处的网点行为油墨网点行。
较佳地，距光源入射相对侧最近处的网点行为荧光粉网点行。
在本发明的一个实施例中，所述网点为双层，第一层为荧光粉网点，第二层为包含散射粒子的油墨网点。
在本发明中所使用的荧光粉的成分包含铝酸盐（例如YAG）、硅酸盐、磷酸盐或氮化物。
本发明中白光产生的原理为：红色+绿色+蓝色=白色（R+G+B=W）。
本发明的LED内部不涂布荧光粉。
 有益效果
本发明的有益效果在于，由于本发明的LED内部不涂布荧光粉，因此荧光粉不再靠近热源，避免了因荧光粉的加速老化而引起的LED颜色改变导致光效下降的问题；再次，因为导光板的光学结构决定了所有从导光板正上方的出光面出射的光都必须至少经过一次网点粒子的散射，因而在散射粒子中加入荧光粉，一方面荧光粉本身有散射的效果，另一方面可以确保散射出去的光可以混合出均匀的颜色，从而进一步提高了导光板的导光效率。
附图说明
图1(a)及图1(b)为现有技术中LED的结构示意图。
图2为现有技术中侧光式背光模块的结构示意图。
图3为现有技术中LED随温度的光效变化情况示意图。
图4为本发明中侧光式背光模块的结构示意图。
图5为本发明的一个具体实施方式中网点采用荧光粉与油墨混合的示意图。
图6为本发明的第二个具体实施方式中网点采用油墨网点与荧光粉网点交替排列的示意图。
图7为本发明的第三个具体实施方式中网点为两层的示意图。
 本发明的最佳实施方式
为让本发明上述目的、特征及优点更明显易懂，下文特举本发明较佳实施例，并配合附图，作详细说明如下：
如图4所示，为本发明中侧光式背光模块整体结构示意图。侧光式背光模块包含若干个LED210、导光板220。其中，导光板220包括底面、入光面及出光面，出光面与底面相对设置，底面包含若干网点230。可选地，出光面与入光面连接。LED210置于导光板220侧边，与入光面相对设置，LED210发出的光经由导光板220的入光面入射。
本发明实施方式中，LED210内部不再涂布荧光粉，LED210发出的光直接经一次LED210本身的封装透镜（lens）出射，即：把LED芯片与荧光粉分开；同时，把导光板220的网点230上的网点材质由普通的散射粒子变为包含荧光粉，并选择性添加散射粒子，这样经由LED210发出的蓝光或者UV光在入射到导光板220的网点230上激发荧光粉从而混合出白光，然后散射到导光板220正上方的出光面形成均匀的面光源。
本发明中白光产生的原理为：红色+绿色+蓝色=白色。作为较佳的实施方式，本发明至少可包括如下四种方案：
一、LED采用蓝光LED，网点成分采用荧光粉和含有散射粒子的油墨的混合物。
具体而言，在此种实施方式中，网点的成分可以包含荧光粉与含有散射粒子的油墨，荧光粉可以为：
黄色荧光粉；或者
黄色荧光粉与红色荧光粉的混合物；或者
绿色荧光粉与红色荧光粉的混合物。
二、LED采用UV紫外光LED，所述网点的成分为红色荧光粉、绿色荧光粉和蓝色荧光粉的混合物。
三、LED采用蓝光LED，所述网点为含有散射粒子的油墨网点与荧光粉网点交替排列，所述荧光粉网点的成分为：
红色荧光粉和绿色荧光粉的混合物；或者
黄色荧光粉和红色荧光粉的混合物。
四、LED采用UV紫外光 LED，所述网点为两层，第一层为荧光粉网点，采用红色荧光粉、绿色荧光粉和蓝色荧光粉的混合物；第二层为油墨网点，采用含有散射粒子的油墨。可以理解的是，网点为两层时，LED也可以采用蓝光LED，网点的第一层可以为黄色荧光粉，第二层为含有散射粒子的油墨网点。
作为较佳的优选地实施方式，本发明所使用到的荧光粉为包含铝酸盐系列荧光粉、硅酸盐系列荧光粉、磷酸盐系列荧光粉或者氮化物系列的荧光粉。
如图5所示，为本发明的一个具体实施方式中网点成分采用荧光粉与油墨混合方案的示意图，即前述方案一。图5中包含LED310、导光板320以及网点330。网点330的成分可以为：黄色荧光粉和含有散射粒子的油墨；或者黄色荧光粉、红色荧光粉和含有散射粒子的油墨；或者绿色荧光粉、红色荧光粉和含有散射粒子的油墨。
在荧光粉与油墨混合的实施方式中，荧光粉与含散射粒子的油墨均匀混合制成网点330时，网点330大小没有明确的要求，可根据实际需要进行设计。在本实施方式中，网点330的直径可以为0.2~0.4毫米，具体而言，最小的印刷网点可以做到0.2mm，通常在0.4mm左右。由于一个网版中的网点数量非常多，图5中对网点的结构进行了简化绘示。
另外，当所述LED310采用UV紫外光LED时，所述网点330的成分可以为红色荧光粉、绿色荧光粉和蓝色荧光粉的混合物，即前述方案二，此时不需要添加含有散射粒子的油墨，网点330的直径和排布方式均与第一个具体实施方式相同，此处不再赘述。
如图6所示，为本发明的第二个具体实施方式中网点采用油墨网点与荧光粉网点交替排列的示意图，即前述方案三。图6中包含LED410、导光板420、荧光粉网点430a和油墨网点430b。在本具体实施方式中，荧光粉网点430a与油墨网点430b的交替排列采用行交替排列的方式，即由荧光粉网点430a组成的荧光粉网点行与含有散射粒子的油墨网点430b组成的油墨网点行交替排列，实际应用中不局限于此。其中，荧光粉网点430a的成分为：红色荧光粉和绿色荧光粉的混合物；或者黄色荧光粉和红色荧光粉的混合物。
为了保证颜色的均匀性，即出光面最终产生的光为白光，在本具体实施方式中，荧光粉网点430a与油墨网点430b的排布方式如下：光源LED410发出的光由光源入射侧S1入射，所述含有散射粒子的油墨网点430b与荧光粉网点430a采用行交替排列，所述油墨网点行的油墨网点430b尺寸自光源入射侧S1起由小增大，所述荧光粉网点行的荧光粉网点430a尺寸自光源入射相对侧(即光源入射侧的另一侧)S2起由小增大，且距光源入射侧S1最近处的一行网点为油墨网点430b，距光源入射相对侧S2最近处的一行网点为荧光粉网点430a。
具体而言，当蓝光入射到黄色荧光粉后会转化为黄光，其中大部分光将出射到导光板420外，而少部分在导光板420内传播，直到被散射出去；蓝光入射到油墨网点430b后会有部分光散射到导光板420外，部分继续在导光板420内传播；蓝光入射到空白处，将被全反射，继续在导光板420内传播。被转化的黄光入射到油墨网点430b上，部分被反射出导光板420外，部分继续在导光板420内传播；黄光入射到荧光粉网点430a上，部分被散射出导光板420，部分继续在导光板420内传播。蓝光入射到荧光粉网点430a出射，因此，导光板420光的颜色均匀性体现在出射的蓝光和黄光比例恒定。在靠近导光板420的光源入射侧S1处，因为入射的光全部为蓝光，所以要有较大的荧光粉网点430a才能混合出白光。随着光线在导光板420里传播，导光板420内部黄光所占的比例不断增大，因此需要把蓝光转化为黄光的比例减小，即荧光粉网点430a减小，而油墨网点430b大小可以根据导光板420的亮度来调节。
如图7所示，为本发明的第三个具体实施方式中网点为两层的示意图，即前述方案四。图7中包含导光板520、荧光粉网点530a和油墨网点530b。网点分为上下两层，上层为涂布荧光粉的荧光粉网点530a，下层为涂布含有散射粒子的油墨网点530b。其中，荧光粉网点530a采用红色荧光粉、绿色荧光粉和蓝色荧光粉的混合物。
由此，本发明通过将LED与荧光粉相互分离，使得LED内部不再涂布荧光粉，避免了因LED发热造成荧光粉的加速老化而引起LED颜色改变，进而导致光效下降的问题。在散射粒子中加入荧光粉的方式，一方面利用了荧光粉本身的散射效果，另一方面可以确保散射出去的光混合出均匀的颜色，提高了导光板的导光效率。
本发明中导光板的网点大小随点间距的大小、面板尺寸、印刷工艺、油墨种类变化而变化，可以根据具体产品的设计需要进行调整。例如，当以本发明的液晶显示装置作为42吋的侧入光式电视机显示装置时，其背光模块所用导光板的网点直径大小范围大致在0.4mm~1.4mm为宜。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。
 本发明的实施方式
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Claims (20)

  1. 一种导光板，包含底面、入光面及出光面，所述出光面与所述底面相对设置，所述底面包含若干网点，所述导光板采用LED作为光源，所述LED光源发出的光经由所述导光板的入光面入射，其特征在于：
    所述LED为蓝光LED ，所述网点为单层，且所述网点分为含有散射粒子的油墨网点与荧光粉网点；所述含有散射粒子的油墨网点与荧光粉网点交替排列，且交替排列的方式为含有散射粒子的油墨网点行与荧光粉网点行交替排列；所述荧光粉网点行的荧光粉网点尺寸自光源入射相对侧起由小增大，所述含有散射粒子的油墨网点行的油墨网点尺寸自光源入射侧起由小增大。
  2. 一种背光模块，包含导光板与LED光源，所述导光板包含底面、入光面及出光面，所述出光面与所述底面相对设置，所述底面包含若干网点，所述LED光源与所述入光面相对设置，其特征在于：所述网点包含荧光粉。
  3. 根据权利要求2所述的背光模块，其特征在于：所述LED为紫外光LED，所述网点为单层，且所述网点的成分包含红色荧光粉、绿色荧光粉和蓝色荧光粉的混合物。
  4. 根据权利要求2所述的背光模块，其特征在于：所述网点还包含散射粒子。
  5. 根据权利要求4所述的背光模块，其特征在于：所述LED为蓝光LED ，所述网点为单层，且所述网点的成分包含荧光粉与含有散射粒子的油墨。
  6. 根据权利要求5所述的背光模块，其特征在于：所述荧光粉为：
    黄色荧光粉；或
    黄色荧光粉与红色荧光粉的混合物；或
    绿色荧光粉与红色荧光粉的混合物。
  7. 根据权利要求4所述的背光模块，其特征在于：所述LED为蓝光LED ，所述网点为单层，且所述网点分为含有散射粒子的油墨网点与荧光粉网点。
  8. 根据权利要求7所述的背光模块，其特征在于：所述含有散射粒子的油墨网点与荧光粉网点交替排列，所述荧光粉网点包含：
    红色荧光粉和绿色荧光粉的混合物；或
    黄色荧光粉和红色荧光粉的混合物。
  9. 根据权利要求8所述的背光模块，其特征在于：所述含有散射粒子的油墨网点与荧光粉网点交替排列的方式为含有散射粒子的油墨网点行与荧光粉网点行交替排列。
  10. 根据权利要求9所述的背光模块，其特征在于：所述荧光粉网点行的荧光粉网点尺寸自光源入射相对侧起由小增大。
  11. 根据权利要求9所述的背光模块，其特征在于：所述含有散射粒子的油墨网点行的油墨网点尺寸自光源入射侧起由小增大。
  12. 根据权利要求9所述的背光模块，其特征在于：距光源入射侧最近处的网点行为油墨网点行。
  13. 根据权利要求9所述的背光模块，其特征在于：距光源入射相对侧最近处的网点行为荧光粉网点行。
  14. 根据权利要求4所述的背光模块，其特征在于：所述网点为双层，其中第一层为荧光粉网点，第二层为含有散射粒子的油墨网点。
  15. 一种导光板，包含底面、入光面及出光面，所述出光面与所述底面相对设置，所述底面包含若干网点，所述导光板采用LED作为光源，所述LED光源发出的光经由所述导光板的入光面入射，其特征在于：所述网点包含荧光粉。
  16. 根据权利要求15所述的导光板，其特征在于：所述网点还包含散射粒子。
  17. 根据权利要求16所述的导光板，其特征在于：所述LED为蓝光LED ，所述网点为单层，且所述网点的成分包含荧光粉与含有散射粒子的油墨。
  18. 根据权利要求17所述的导光板，其特征在于：所述含有散射粒子的油墨网点与荧光粉网点交替排列。
  19. 根据权利要求18所述的导光板，其特征在于：所述含有散射粒子的油墨网点与荧光粉网点交替排列的方式为含有散射粒子的油墨网点行与荧光粉网点行交替排列。
  20. 根据权利要求19所述的导光板，其特征在于：所述荧光粉网点行的荧光粉网点尺寸自光源入射相对侧起由小增大
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CN1519624A (zh) * 2003-01-20 2004-08-11 明基电通股份有限公司 直下式背光模块
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CN101025517A (zh) * 2006-02-24 2007-08-29 鸿富锦精密工业（深圳）有限公司 背光模组
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CN101750668A (zh) * 2008-12-01 2010-06-23 深圳富泰宏精密工业有限公司 导光板及应用该导光板的背光模组
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