CN105929481A - Backlight module and light guide plate thereof - Google Patents

Backlight module and light guide plate thereof Download PDF

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Publication number
CN105929481A
CN105929481A CN201610557764.XA CN201610557764A CN105929481A CN 105929481 A CN105929481 A CN 105929481A CN 201610557764 A CN201610557764 A CN 201610557764A CN 105929481 A CN105929481 A CN 105929481A
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light
density
structured pattern
micro structured
guide plate
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周翠敏
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    • 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
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces

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

Abstract

The invention relates to a backlight module and a light guide plate thereof, comprising: a light guide plate, comprising: the light-transmitting plate body comprises a light-in side surface and a light-out surface adjacent to the light-in side surface, wherein the light-out surface is divided into a surface light source area and a surrounding area surrounding the surface light source area; a first density microstructure pattern distributed in the area of the surface light source; and a plurality of second density microstructure patterns, located in the surrounding area, the second density being greater than the first density and linearly arranged along the light incident side; and a light source assembly, comprising: a substrate; the plurality of point light sources are linearly arranged on the substrate and face the light incidence side face at intervals, a spacing area is defined between any two adjacent point light sources, and each second-density microstructure pattern is aligned with one of the spacing areas; wherein each second density microstructure pattern is an isosceles trapezoid.

Description

一种背光模组及其导光板A kind of backlight module and its light guide plate

技术领域 technical field

本发明涉及一种导光板,且特别涉及一种背光模组的导光板。 The invention relates to a light guide plate, and in particular to a light guide plate of a backlight module.

背景技术 Background technique

背光模组分为直下式背光模组和侧入式背光模组。侧入式背光模组具有如下结构,即光源被设置成面对导光板的一侧,并且多个光学片被设置在液晶面板与导光板之间。在侧入式背光模组中,光源将光照射至导光板的一侧并且导光板将线光源或点光源转换成面光源。 Backlight modules are divided into direct-type backlight modules and side-type backlight modules. The side-type backlight module has a structure in which the light source is arranged to face one side of the light guide plate, and a plurality of optical sheets are arranged between the liquid crystal panel and the light guide plate. In an edge-lit backlight module, a light source irradiates light to one side of a light guide plate and the light guide plate converts a line light source or a point light source into a surface light source.

在这两种背光模组中,侧入式背光模组由于将光提供至导光板的一侧而具有热点现象的问题。图1是解释热点问题的视图,该图是选择性地示出了导光板10以及用作光源的发光二极管LED1、LED2的顶视平面图。如图1所示,第一发光二极管LED1和第二发光二极管LED2被设置于一侧,以便面对导光板10的边缘。众所周知,发光二极管是方向性元件,因此光以预定的方向角(α)进入导光板10。由此,存在着来自第一发光二极管LED1的光与来自第二发光二极管LED2的光并未混合在一起的部分(图1中的斜线部分,以下称作“阴影区GA”)。因此,阴影区GA看起来暗,而光来自第一发光二极管LED1和第二发光二极管LED2的部分(以下称作“发光区WA”)看起来亮,从而根据位置产生了亮度的差异并且导致了热点问题。由于热点,所以导光板10的面对发光二极管的入射面具有波状图案。因为导光板是将点光源变为面光源并将光提供至设置于其上方的液晶面板的部件,所以如果光呈现为波状,则液晶面板的亮度由于导光板的波状图案而变得不均匀,因而不能以期望的形状适当地显示图像。克服此热点问题的一种简单的方式是增加发光二极管的数量。也就是说,热点问题能够通过足够密集地排列发光二极管以防止图1中所示出的阴影区GA的形成来克服。然而,如此增加发光二极管的数量需要更高的功耗,而这是不期望的。另一种方式是增加边框的尺寸,以便热点部分被阻挡从而不可见。 Among the two backlight modules, the edge-type backlight module has a problem of a hot spot phenomenon due to providing light to one side of the light guide plate. 1 is a view for explaining the problem of hot spots, which is a top plan view selectively showing a light guide plate 10 and light emitting diodes LED1, LED2 serving as light sources. As shown in FIG. 1 , the first light emitting diode LED1 and the second light emitting diode LED2 are disposed on one side so as to face the edge of the light guide plate 10 . As we all know, light emitting diodes are directional elements, so light enters the light guide plate 10 at a predetermined direction angle (α). Thus, there is a portion where the light from the first light emitting diode LED1 and the light from the second light emitting diode LED2 are not mixed together (hatched portion in FIG. 1 , hereinafter referred to as “hatched area GA”). Therefore, the shaded area GA looks dark, and a portion where light comes from the first light emitting diode LED1 and the second light emitting diode LED2 (hereinafter referred to as "light emitting area WA") looks bright, thereby producing a difference in brightness according to positions and causing Hot Issues. Due to the hot spots, the incident surface of the light guide plate 10 facing the light emitting diodes has a wavy pattern. Since the light guide plate is a part that turns a point light source into a surface light source and supplies light to a liquid crystal panel placed above it, if the light appears wavy, the brightness of the liquid crystal panel becomes uneven due to the wavy pattern of the light guide plate, Thus, an image cannot be properly displayed in a desired shape. A simple way to overcome this hot spot problem is to increase the number of LEDs. That is, the hot spot problem can be overcome by arranging the LEDs densely enough to prevent the formation of the shadow area GA shown in FIG. 1 . However, such an increase in the number of light emitting diodes requires higher power consumption, which is not desirable. Another way is to increase the size of the border so that the hotspot is partially blocked and not visible.

液晶面板和背光单元通常封装在外壳中:后盖和前盖结合在一起以封装在其间插置的液晶面板和背光单元。在封装时,液晶面板的边缘被前盖阻挡。液晶面板被前盖阻挡的部分称为边框。 The liquid crystal panel and the backlight unit are generally packaged in a case: the rear cover and the front cover are combined to encapsulate the liquid crystal panel and the backlight unit interposed therebetween. During packaging, the edges of the liquid crystal panel are blocked by the front cover. The part of the LCD panel blocked by the front cover is called the bezel.

边框在正面覆盖液晶面板,从而减小了液晶面板显示图像的显示区的尺寸。最近发布的液晶显示装置减小了边框的尺寸,从而具有扩大的显示区,这在设计方面对消费者具有吸引力。如此,出于解决热点问题的目的而增加边框尺寸的方法由于显示区的减小而不具优势并且在设计方面不受欢迎。 The bezel covers the liquid crystal panel on the front, thereby reducing the size of a display area where the liquid crystal panel displays images. Recently released liquid crystal display devices reduce the size of bezels to have an enlarged display area, which is attractive to consumers in terms of design. As such, the method of increasing the bezel size for the purpose of solving the hot spot problem is not advantageous due to the reduction of the display area and is unfavorable in terms of design.

由此可见,上述导光板仍存在不便与缺陷,而有待加以进一步改良。因此,如何能有效地解决上述不便与缺陷,实属当前重要研发课题之一,也成为当前相关领域亟需改进的目标。 It can be seen that the above-mentioned light guide plate still has inconveniences and defects, and needs to be further improved. Therefore, how to effectively solve the above-mentioned inconveniences and defects is one of the current important research and development topics, and it has also become an urgent need for improvement in related fields.

发明内容 Contents of the invention

本发明要解决的技术问题是为了克服现有技术中传统的背光模组的光学效果欠佳,以及整体光利用效率与均匀度的降低的缺陷,提供一种背光模组与其导光板。 The technical problem to be solved by the present invention is to provide a backlight module and its light guide plate in order to overcome the disadvantages of poor optical effect of the traditional backlight module in the prior art, and the decrease of the overall light utilization efficiency and uniformity.

本发明是通过下述技术方案来解决上述技术问题: The present invention solves the above technical problems through the following technical solutions:

一种背光模组,其特征在于,包含: A backlight module, characterized in that it comprises:

一导光板,包含: A light guide plate, comprising:

一透光板体,包含一入光侧面与一邻接该入光侧面的出光面,该出光面分为一面光源区域与一围绕该面光源区域的环绕区; A light-transmitting plate body, including a light incident side and a light exit surface adjacent to the light incident side, the light exit surface is divided into a surface light source area and a surrounding area surrounding the surface light source area;

一第一密度微结构图案,分布于该面光源区域内;以及 a first density microstructure pattern distributed in the area of the surface light source; and

多个第二密度微结构图案,位于该环绕区内,且沿该入光侧面线性排列,其中该第二密度大于该第一密度; A plurality of second-density microstructure patterns are located in the surrounding area and arranged linearly along the light-incident side, wherein the second density is greater than the first density;

以及 as well as

一光源组件,包含: A light source assembly, including:

一基板;以及 a substrate; and

复数个点光源,线性排列于该基板上,且间隔地面对该入光侧面,其中任意两个相邻的该些点光源之间定义有一间隔区域,且每一第二密度微结构图案对齐该些间隔区域其中一个; A plurality of point light sources are arranged linearly on the substrate and face the light-incident side at intervals, wherein a space area is defined between any two adjacent point light sources, and each second-density microstructure pattern is aligned one of the compartmental areas;

其中每一第二密度微结构图案的为一等腰梯形, wherein each second-density microstructure pattern is an isosceles trapezoid,

该等腰梯形的下底边长度等于任意两个相邻的该些点光源之间的距离,上底边长度为下底边长度的一半,该环绕区的一宽度等于该梯形的一上底边的长度。 The length of the lower base of the isosceles trapezoid is equal to the distance between any two adjacent point light sources, the length of the upper base is half of the length of the lower base, and a width of the surrounding area is equal to an upper base of the trapezoid The length of the side.

较佳地,所述第二密度微结构图案的微结构深度不小于34微米,半径不小于59微米。 Preferably, the microstructure depth of the microstructure pattern of the second density is not less than 34 microns, and the radius is not less than 59 microns.

较佳地,所述入光侧面为锯齿面。 Preferably, the light-incident side is a serrated surface.

较佳地,沿背离所述入光侧面的方向上,所述第一密度微结构图案的密度逐渐增大。 Preferably, along the direction away from the light-incident side, the density of the first-density microstructure pattern gradually increases.

本发明还提供了一种导光板,其特征在于,该导光板包括: The present invention also provides a light guide plate, characterized in that the light guide plate comprises:

一透光板体,包括一面光源区域与一过渡区域,该过渡区域呈狭长状,且位于该面光源区域与该入光侧面之间; A light-transmitting plate body, including a surface light source area and a transition area, the transition area is long and narrow, and is located between the surface light source area and the light-incident side;

一第一密度微结构图案,分布于该面光源区域内;以及 a first density microstructure pattern distributed in the area of the surface light source; and

复数个第二密度微结构图案,每一该些第二密度微结构图案是呈一等腰梯形,位于该过渡区域内,该等腰梯形的下底边长度等于任意两个相邻的该些点光源之间的距离,上底边长度为下底边长度的一半。该环绕区的一宽度等于该梯形的一上底边的长度,且与间隔排列的该些点光源互相交错设置;所述第二密度微结构图案的微结构深度不小于34微米,半径不小于59微米; A plurality of second-density microstructure patterns, each of these second-density microstructure patterns is an isosceles trapezoid, located in the transition region, and the length of the lower base of the isosceles trapezoid is equal to any two adjacent ones The distance between point light sources, the length of the upper base is half of the length of the lower base. The width of the surrounding area is equal to the length of an upper base of the trapezoid, and it is interlaced with the point light sources arranged at intervals; the microstructure depth of the second density microstructure pattern is not less than 34 microns, and the radius is not less than 59 microns;

沿背离所述入光侧面的方向上,所述第一密度微结构图案的密度逐渐增大; Along the direction away from the light incident side, the density of the first density microstructure pattern gradually increases;

其中,当间隔排列的该些点光源发光时,该些第二密度微结构图案在任意两个间隔排列的该些点光源之间形成伪光源,进而淡化光学亮点。 Wherein, when the point light sources arranged at intervals emit light, the microstructure patterns of the second density form a pseudo light source between any two of the point light sources arranged at intervals, thereby diluting the optical bright spots.

在符合本领域常识的基础上,上述各优选条件,可任意组合,即得本发明各较佳实例。 On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

本发明的积极进步效果在于: The positive progress effect of the present invention is:

本发明的这些等腰梯形的第二密度微结构图案可在过渡区域上对应于任意两个光学亮点之间提供伪光源,由此均匀化过渡区域的亮度,进而淡化光学亮点与暗区的明显对比。 These isosceles trapezoidal second-density microstructure patterns of the present invention can provide a pseudo light source between any two optical bright spots corresponding to the transition area, thereby uniformizing the brightness of the transition area, thereby weakening the obvious difference between the optical bright spots and dark areas. Compared.

附图说明 Description of drawings

图1是现有技术中背光模组的导光板的热点问题的视图。 FIG. 1 is a view of the hot spot problem of a light guide plate of a backlight module in the prior art.

图2是本发明导光板的结构示意图。 Fig. 2 is a schematic structural view of the light guide plate of the present invention.

图3是本发明比较例的导光板的结构示意图。 FIG. 3 is a schematic structural view of a light guide plate of a comparative example of the present invention.

具体实施方式 detailed description

以下将以图来揭露本发明的具体实施方式,为明确说明起见,许多实务上的细节将在以下叙述中一并说明。然而,应了解到,这些实务上的细节不应用以限制本发明。也就是说,在本发明部分实施方式中,这些实务上的细节是非必要的。此外,为简化图式起见,一些习知惯用的结构与组件在图式中将以简单示意的方式示出。 The specific implementation manners of the present invention will be disclosed in the following figures. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some well-known structures and components will be shown in a simple and schematic manner in the drawings.

图2示出了依据本发明实施方式的导光板的结构示意图。如图2所示,一种背光模组,包含:一导光板1,包含:一透光板体2,包含一入光侧面与一邻接该入光侧面的出光面,该出光面分为一面光源区域B与一围绕该面光源区域B的环绕区A;一第一密度微结构图案3,分布于该面光源区域内;以及多个第二密度微结构图案4,位于该环绕区内,且沿该入光侧面线性排列,其中该第二密度大于第一密度;以及一光源组件5,包含:一基板6;以及复数个点光源7,线性排列于该基板上,且间隔地面对该入光侧面,其中任意两个相邻的该些点光源之间定义有一间隔区域C,且每一该些第二密度微结构图案对齐该些间隔区域其中一个;其中每一第二密度微结构图案的外型是一等腰梯形。 Fig. 2 shows a schematic structural diagram of a light guide plate according to an embodiment of the present invention. As shown in Figure 2, a backlight module includes: a light guide plate 1, including: a light-transmitting plate body 2, including a light incident side and a light exit surface adjacent to the light incident side, the light exit surface is divided into one side The light source area B and a surrounding area A surrounding the surface light source area B; a first density microstructure pattern 3 distributed in the surface light source area; and a plurality of second density microstructure patterns 4 located in the surrounding area, and arranged linearly along the light-incident side, wherein the second density is greater than the first density; and a light source assembly 5, comprising: a substrate 6; and a plurality of point light sources 7, arranged linearly on the substrate, and facing at intervals On the light-incident side, a spacer region C is defined between any two adjacent point light sources, and each of the second density microstructure patterns is aligned with one of the spacer regions; wherein each second density microstructure pattern is aligned with one of the spacer regions; The shape of the structural pattern is an isosceles trapezoid.

如此,当这些间隔排列的点光源对入光侧面发光进而产生光学亮点时,上述这些等腰梯形的第二密度微结构图案4可在对应于任二光学亮点(hot spot)之间的位置形成伪光源,让这些光学亮点与这些伪光源产生混合,由此均匀化亮度,进而淡化光学亮点与暗区的明显对比。 In this way, when these point light sources arranged at intervals emit light on the light-incident side to generate optical hot spots, the above-mentioned isosceles trapezoidal second-density microstructure patterns 4 can be formed at positions corresponding to any two optical bright spots (hot spots) Pseudo-light sources, allowing these optical bright spots to mix with these pseudo-light sources, thereby uniformizing the brightness, thereby weakening the obvious contrast between optical bright spots and dark areas.

更具体地,该等腰梯形的下底边长度等于任意两个相邻的该些点光源之间的距离,上底边长度为下底边长度的一半。该环绕区的一宽度等于该梯形的一上底边的长度。较佳地,所述入光侧面为锯齿面。较佳地,沿背离所述入光侧面的方向上,所述第一密度微结构图案的密度逐渐增大。而其具体形状可透过调控等腰梯形的上下底边及侧边这三个参数来控制。 More specifically, the length of the lower base of the isosceles trapezoid is equal to the distance between any two adjacent point light sources, and the length of the upper base is half of the length of the lower base. A width of the surrounding area is equal to a length of an upper base of the trapezoid. Preferably, the light-incident side is a serrated surface. Preferably, along the direction away from the light-incident side, the density of the first-density microstructure pattern gradually increases. And its specific shape can be controlled by adjusting the three parameters of the upper and lower bases and sides of the isosceles trapezoid.

在本实施方式中,每个第二密度微结构图案是由多个光学微结构所组成,这些光学微结构间隔地分布。举实例而言,在46英寸,2mm厚度的导光板设计实例上,以深度30微米,半径50微米的网点实现上述光学微结构,第二密度微结构图案130其分布密度可以在60%~70%间依个案选用,分布密度是指多个光学微结构的总面积与第二密度微结构图案的面积比值;这是因为如果点光源的亮度较强,则利用第二密度微结构图案仿真伪光源时,需要较密或较深的光学微结构。经实际制作样品验证,其可使光学均匀度达75%以上。然而,本发明不限于此,本发明所属技术领域中具有通常知识的人,也可视实际需要,改设定分布密度为其他范围内。 In this embodiment, each microstructure pattern of the second density is composed of a plurality of optical microstructures, and these optical microstructures are distributed at intervals. For example, on a design example of a 46-inch light guide plate with a thickness of 2 mm, the above-mentioned optical microstructure is realized with dots with a depth of 30 microns and a radius of 50 microns, and the distribution density of the second density microstructure pattern 130 can be 60% to 70%. The distribution density refers to the ratio of the total area of multiple optical microstructures to the area of the second density microstructure pattern; When using light sources, denser or deeper optical microstructures are required. It is verified by actually making samples that the optical uniformity can reach more than 75%. However, the present invention is not limited thereto, and those with ordinary knowledge in the technical field to which the present invention pertains can also change the distribution density to other ranges according to actual needs.

图3为本发明比较例的局部放大图,在图3中,此比较例的导光板的构造与上述导光板的构造大致相同,其差异之一为第二密度微结构图案4呈正方形,发明人依据正方形的第二密度微结构图案4取得过渡区域的光学均匀度,约在60%。由此可知,相较于正方形的第二密度微结构图案4,当第二密度微结构图案4为等腰梯形时,可得到较佳的光均匀结果。因此,第二密度微结构图案的形状并非可由任意图案可以等效置换的。 Fig. 3 is a partially enlarged view of a comparative example of the present invention. In Fig. 3, the structure of the light guide plate of this comparative example is roughly the same as that of the above-mentioned light guide plate, and one of the differences is that the second density microstructure pattern 4 is a square, which is the invention. According to the square second density microstructure pattern 4, the optical uniformity of the transition area is about 60%. It can be seen that, compared with the square second-density microstructure pattern 4 , when the second-density microstructure pattern 4 is isosceles trapezoidal, a better light uniformity result can be obtained. Therefore, the shape of the microstructure pattern of the second density cannot be equivalently replaced by any pattern.

另外,对于第二密度微结构图案4呈半椭圆形的比较例(未图示,其差异在于第二密度微结构图案4呈半椭圆形),过渡区域的光学均匀度约60-70%,由此可知,当第二密度微结构图案4为等腰梯形形时,可得到较佳的光均匀结果。 In addition, for the comparative example in which the microstructure pattern 4 of the second density is semi-elliptical (not shown, the difference is that the microstructure pattern 4 of the second density is semi-elliptical), the optical uniformity of the transition region is about 60-70%, It can be seen from the above that when the microstructure pattern 4 of the second density is in the shape of an isosceles trapezoid, a better light uniformity result can be obtained.

虽然以上描述了本发明的具体实施方式,但是本领域的技术人员应当理解,这仅是举例说明,本发明的保护范围是由所附权利要求书限定的。本领域的技术人员在不背离本发明的原理和实质的前提下,可以对这些实施方式做出多种变更或修改,但这些变更和修改均落入本发明的保护范围。 Although the specific implementation of the present invention has been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (5)

1. a backlight module, it is characterised in that comprise:
One light guide plate, comprises:
One printing opacity plate body, comprises a light incident sides and an exiting surface adjoining this light incident sides, and this exiting surface is divided into a source region with one around the cincture district in this area source region;
One first density micro structured pattern, is distributed in this area source region;And
Multiple second density micro structured pattern, are positioned at this cincture district, and along this light incident sides linear arrangement, the most above-mentioned second density is more than above-mentioned first density;
And
One light source assembly, comprises:
One substrate;And
Plurality of points light source, linear arrangement is on this substrate, and compartment of terrain is in the face of this light incident sides, and between those point sources that any two of which is adjacent, definition has an interval region, and each second density micro structured pattern alignment interval region one of them;
Each of which the second density micro structured pattern for an isosceles trapezoid,
Distance between those point sources that the bottom length of this isosceles trapezoid is adjacent equal to any two, the half of a length of bottom, upper base length, the width in this cincture district is equal to the length on this trapezoidal upper base.
Backlight module the most according to claim 1, it is characterised in that the depth of microstructure of described second density micro structured pattern is not less than 34 microns, radius is not less than 59 microns.
A kind of backlight module the most according to claim 1, it is characterised in that described light incident sides is serrated face.
Backlight module the most according to claim 1, it is characterised in that along deviating from the direction of described incidence surface, the density of described first density micro structured pattern is gradually increased.
5. a light guide plate, it is characterised in that this light guide plate includes:
One printing opacity plate body, including a source region and a transitional region, this transitional region is long and narrow, and between area source region and this light incident sides;
One first density micro structured pattern, is distributed in this area source region;And
A plurality of second density micro structured pattern, each second density micro structured pattern is in an isosceles trapezoid, it is positioned at this transitional region, distance between those point sources that the bottom length of this isosceles trapezoid is adjacent equal to any two, the half of a length of bottom, upper base length, one width in this cincture district is equal to this length on base on trapezoidal one and interwoven with those point sources spaced;The depth of microstructure of described second density micro structured pattern is not less than 34 microns, and radius is not less than 59 microns;Along deviating from the direction of described light incident sides, the density of described first density micro structured pattern is gradually increased;Wherein, when those point light source light-emittings spaced, those the second density micro structured pattern form pseudo-light source, and then desalination optics bright spot between any two those point sources spaced.
CN201610557764.XA 2016-07-15 2016-07-15 Backlight module and light guide plate thereof Pending CN105929481A (en)

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Application publication date: 20160907