TWI631392B - Backlight module - Google Patents
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Abstract
本發明係有關於一種背光模組，其包含一背光源；一反射式偏光板，位於該背光源之一側，以及一散射式偏光板，位於該反射式偏光板與該背光源之間，該反射式偏光板具有相互垂直之一第一穿透軸及一反射軸，該散射式偏光板具有相互垂直之一第二穿透軸及一散射軸，其中，該反射式偏光板之第一穿透軸與該散射式偏光板之散射軸相互平行。The invention relates to a backlight module, which includes a backlight; a reflective polarizer on one side of the backlight, and a scattering polarizer between the reflective polarizer and the backlight, The reflective polarizer has a first transmission axis and a reflection axis that are perpendicular to each other, and the scattering polarizer has a second transmission axis and a scattering axis that are perpendicular to each other, wherein the first of the reflective polarizer The transmission axis is parallel to the scattering axis of the scattering polarizer.
Description
本發明是有關於一種背光模組，且特別是一種用於液晶顯示器且具有增加光源利用率之背光模組。The present invention relates to a backlight module, and in particular to a backlight module used in a liquid crystal display and having increased light source utilization.
習知液晶顯示器所搭配之偏光板，普遍採用吸收型偏光板，背光源所發出之非偏振光線穿過偏光板時，在偏光板的吸收軸方向上的分量會被吸收而無法通過，因此，偏光板對背光源之透光度理論上僅能達50%以下，光線再經過液晶面板之電極層、彩色濾光片、液晶層及玻璃基板等結構後，使用者實際可見顯示器之亮度，則僅剩下背光源所發出的10%以下，故背光源利用率相當低而造成能源的浪費。The polarizers used in conventional LCD displays generally use absorption polarizers. When the non-polarized light emitted by the backlight passes through the polarizer, the component in the direction of the absorption axis of the polarizer will be absorbed and cannot pass through. Therefore, The light transmittance of the polarizer to the backlight can theoretically be less than 50%. After the light passes through the electrode layer, color filter, liquid crystal layer and glass substrate of the liquid crystal panel, the user can actually see the brightness of the display. Only less than 10% of the emission from the backlight is left, so the utilization rate of the backlight is quite low and energy is wasted.
現行存在許多增加背光源效率的方法已被提出，其中一種方法為增加一反射式偏光板於背光模組中，以將無法穿過液晶面板之下偏光板之光線反射回背光模組而回收利用後，再穿過下偏光板以達到增亮的目的。There are currently many methods for increasing the efficiency of the backlight source, one of which is to add a reflective polarizer to the backlight module to reflect the light that cannot pass through the polarizer under the liquid crystal panel back to the backlight module for recycling After that, pass through the lower polarizer to achieve the purpose of brightening.
但背光模組中除了反射式偏光板外，一般還包含導光板、聚光稜鏡片和擴散片等不同功能的光學膜片，使光源可均勻照射至液晶面板。如第1圖所示，在此以液晶顯示器中具有反射式偏光板2及擴散片3的習知背光模組1為例，當背光源4所出射的非偏振之光線(L)進入擴散片3後，僅改變了行進角度，變為擴散的光線(L1)，光線(L1)仍為非偏振光，光線(L1)進入反射式偏光板2後，在其穿透軸5方向的分量可直接通過該反射式偏光板2，形成具偏振性的光線(L2)，而在反射軸6之方向的分量的光線(L3)則被反射回背光源4方向，並再次經過擴散片3破壞其偏振性，形成光線(L4)以回收利用，使最終形成與該反射式偏光板2之穿透軸5方向相同的光線分量而通過該反射式偏光板2。但從反射式偏光板2回收的光線反覆經過習知背光模組1中的光學膜片時，尤其是在此所舉例之擴散片3，因為擴散片3一般皆包含散射粒子(未示於圖中)，且透光度較低，故光線反覆通過擴散片3時，其偏振性及強度皆會被一再破壞、減弱，令實際所能回收利用而再次穿過反射式偏光板2及後續液晶顯示器之下偏光板(未示於圖中)之偏振光效果不如預期。However, in addition to the reflective polarizing plate, the backlight module generally includes optical films with different functions such as a light guide plate, a concentrating sheet, and a diffusion sheet, so that the light source can evenly illuminate the liquid crystal panel. As shown in FIG. 1, here is a conventional backlight module 1 with a reflective polarizer 2 and a diffuser 3 in an LCD, as an example, when the unpolarized light (L) emitted from the backlight 4 enters the diffuser After 3, only the travel angle is changed, and it becomes diffused light (L1). The light (L1) is still unpolarized light. After the light (L1) enters the reflective polarizer 2, its component in the direction of the transmission axis 5 can be Directly through the reflective polarizer 2, polarized light (L2) is formed, and the component light (L3) in the direction of the reflection axis 6 is reflected back to the direction of the backlight 4, and passes through the diffuser 3 again to destroy it Polarization, forming light (L4) for recycling, and finally forming the light component in the same direction as the transmission axis 5 of the reflective polarizer 2 and passing the reflective polarizer 2. However, when the light recovered from the reflective polarizer 2 repeatedly passes through the optical film in the conventional backlight module 1, especially the diffusion sheet 3 exemplified here, because the diffusion sheet 3 generally contains scattering particles (not shown in the figure) Medium), and the light transmittance is low, so when the light repeatedly passes through the diffuser 3, its polarization and intensity will be destroyed and weakened again and again, so that the actual recycling can pass through the reflective polarizer 2 and the subsequent liquid crystal again. The polarized light (not shown in the figure) under the display does not perform as expected.
有鑑於上述習知技藝之問題，本發明之目的在於提供一種具備新穎性、進步性及產業利用性等專利要件之背光模組，以期克服現有產品之難點。In view of the above-mentioned problems of the prior art, the purpose of the present invention is to provide a backlight module with patent requirements such as novelty, advancement, and industrial utilization, in order to overcome the difficulties of existing products.
為達到上述目的，本發明提供一種背光模組，在一實施態樣中，其包含一背光源；一反射式偏光板，位於該背光源之一側，其具有相互垂直之一第一穿透軸及一反射軸；以及一散射式偏光板，位於該反射式偏光板與該背光源之間，其具有相互垂直之一第二穿透軸及一散射軸；其中，該反射式偏光板之第一穿透軸與該散射式偏光板之散射軸相互平行。To achieve the above object, the present invention provides a backlight module. In one embodiment, it includes a backlight; a reflective polarizer is located on one side of the backlight and has a first penetration perpendicular to each other Axis and a reflection axis; and a scattering polarizing plate located between the reflecting polarizing plate and the backlight, which has a second transmission axis and a scattering axis perpendicular to each other; wherein, the reflecting polarizing plate The first transmission axis is parallel to the scattering axis of the scattering polarizer.
在本發明另一實施例之背光模組中，該背光源中進一步包含一導光層及一反射層。In a backlight module of another embodiment of the present invention, the backlight further includes a light guide layer and a reflective layer.
在本發明另一實施例之背光模組中，該反射式偏光板係選自多層膜式增亮膜、膽固醇液晶增亮膜、次波長金屬光柵和微結構偏振分離膜所組合的群組其中之一或其組合。In a backlight module according to another embodiment of the present invention, the reflective polarizer is selected from the group consisting of a multi-layer film brightness enhancement film, a cholesterol liquid crystal brightness enhancement film, a sub-wavelength metal grating, and a microstructure polarization separation film One or a combination thereof.
在本發明另一實施例之背光模組中，該散射式偏光板包含一各向異性材料與一各向同性材料構成之基材。In a backlight module according to another embodiment of the present invention, the scattering polarizer includes an anisotropic material and an isotropic material.
在本發明另一實施例之背光模組中，該散射式偏光板係以各向異性材料分散於各向同性材料之基材中。In the backlight module of another embodiment of the present invention, the scattering polarizing plate is dispersed in the base material of the isotropic material with an anisotropic material.
在本發明另一實施例之背光模組中，該各向同性材料之折射率係介於1.4至1.7。In a backlight module of another embodiment of the present invention, the refractive index of the isotropic material is between 1.4 and 1.7.
在本發明另一實施例之背光模組中，該各向異性材料之異常光折射率(extraordinary light refractive index, ne)與尋常光折射率(ordinary light refractive index, no)之折射率差值係介於0.2至0.25。In a backlight module according to another embodiment of the present invention, the difference in refractive index between the extraordinary light refractive index (ne) and the ordinary light refractive index (no) of the anisotropic material is Between 0.2 and 0.25.
在本發明另一實施例之背光模組中，該各向同性材料係選自由聚乙烯醇、聚烯烴類高分子、聚酯類高分子、聚醯胺類高分子和聚偏氟乙烯所構成的群組其中之一或其組合。In a backlight module of another embodiment of the present invention, the isotropic material is selected from the group consisting of polyvinyl alcohol, polyolefin-based polymer, polyester-based polymer, polyamide-based polymer, and polyvinylidene fluoride One of the groups or a combination of them.
在本發明另一實施例之背光模組中，該各向異性材料係選自由雙折射晶體、層列型液晶、膽固醇液晶、棒狀液晶、碟型液晶、柱型液晶、高分子液晶、扭轉向列型液晶、超扭轉向列型液晶以及雙折射樹脂所構成的群組其中之一或其組合。In a backlight module of another embodiment of the present invention, the anisotropic material is selected from the group consisting of birefringent crystals, smectic liquid crystals, cholesterol liquid crystals, rod-shaped liquid crystals, dish-shaped liquid crystals, columnar liquid crystals, polymer liquid crystals, and twisted One or a combination of nematic liquid crystal, super twisted nematic liquid crystal, and birefringent resin.
為使本發明之發明特徵、內容與優點及其所能達成之功效更易瞭解，茲將本發明配合附圖，並以實施例之表達形式詳細說明如下，而其中所使用之圖式，其主旨僅為示意及輔助說明書之用，未必為本發明實施後之真實比例與精準配置，故不應就所附之圖式的比例與配置關係解讀、侷限本發明於實際實施上的權利範圍，合先敘明。In order to make the invention features, contents, advantages and achievable effects easier to understand, the present invention is described in detail in conjunction with the drawings and in the form of expressions of the embodiments, and the drawings used therein have the main purpose It is only for illustration and auxiliary description, and may not be the true scale and precise configuration after the implementation of the present invention, so it should not be interpreted and limited to the relationship between the scale and configuration of the attached drawings, and the scope of the present invention in practical implementation is limited. First clarify.
以下將參照相關圖式，說明依本發明之背光模組之實施例，為使便於理解，下述實施例中之相同元件係以相同之符號標示來說明。Hereinafter, embodiments of the backlight module according to the present invention will be described with reference to related drawings. For ease of understanding, the same elements in the following embodiments are described with the same symbols.
請配合參看第2圖所示，其為本發明所提供一較佳實施態樣之背光模組11之剖面示意圖。在一實施態樣中，其包含一背光源41；一反射式偏光板21，位於該背光源41之一側，其具有相互垂直之一第一穿透軸51及一反射軸61；以及一散射式偏光板31，位於該反射式偏光板21與該背光源41之間，其具有相互垂直之一第二穿透軸81及一散射軸71；其中，該反射式偏光板21之第一穿透軸51與該散射式偏光板31之散射軸71相互平行。Please refer to FIG. 2, which is a schematic cross-sectional view of a backlight module 11 according to a preferred embodiment of the present invention. In one embodiment, it includes a backlight 41; a reflective polarizer 21 located on one side of the backlight 41, which has a first transmission axis 51 and a reflection axis 61 perpendicular to each other; and a The scattering polarizing plate 31 is located between the reflective polarizing plate 21 and the backlight 41, and has a second transmission axis 81 and a scattering axis 71 perpendicular to each other; wherein, the first of the reflective polarizing plate 21 The transmission axis 51 and the scattering axis 71 of the scattering polarizing plate 31 are parallel to each other.
在本發明另一實施例之背光模組11’中，如第2’圖之剖面示意圖所示，背光源41’中進一步包含一導光層41a及反射層41b，以反射集中光線並可獲得較均勻之視角。In the backlight module 11 'of another embodiment of the present invention, as shown in the cross-sectional schematic diagram of FIG. 2', the backlight 41 'further includes a light guide layer 41a and a reflective layer 41b to reflect concentrated light and obtain More uniform viewing angle.
如第2圖、第2’圖所示，當背光模組11之背光源41或背光模組11’之背光源41’所出射的非偏振之光線(L’)進入散射式偏光板31後，與散射式偏光板31之散射軸71及反射式偏光板21之第一穿透軸51相同方向分量之光線變為擴散的光線(L1’)，並直接穿過反射式偏光板21，而獲得均勻散射且在第一穿透軸51方向上偏振性佳之光線(L2’)，而背光源41、背光源41’所出射的非偏振之光線(L’) 與散射式偏光板31之第二穿透軸81及反射式偏光板21之反射軸61相同方向分量之光線則不發生散射而直接穿透該散射式偏光板31後，被反射式偏光板21反射形成與反射軸61相同偏振方向之光線(L3’)，並再次直接穿透該散射式偏光板31形成光線(L4’)，且因與散射式偏光板31之第二穿透軸81相同方向之光線分量皆為直接穿透，故所回收之光線強度幾乎無發生減損，可更佳地反射回背光源41、背光源41’ 再次反射利用，尤其是背光源41’還可藉由反射層41b而獲得更高的光線回收效率。而與散射式偏光板31之散射軸71相同方向之光線即使發生散射仍具有一定偏振性，使得散射式偏光板31不但可替代具有勻光效果的習知擴散片，因為散射式偏光板31之散射軸71與反射式偏光板21之第一穿透軸51相互平行，故光線更可以較佳效率通過反射式偏光板21及後續液晶顯示器之下偏光板(未示於圖中)。As shown in FIG. 2 and FIG. 2 ', when the unpolarized light (L') emitted from the backlight 41 of the backlight module 11 or the backlight 41 'of the backlight module 11' enters the scattering polarizing plate 31 , The light of the same direction component as the scattering axis 71 of the scattering polarizing plate 31 and the first transmission axis 51 of the reflecting polarizing plate 21 becomes diffused light (L1 '), and passes directly through the reflecting polarizing plate 21, and The uniformly scattered light (L2 ') with good polarization in the direction of the first transmission axis 51 is obtained, and the backlight 41, the unpolarized light (L') emitted by the backlight 41 'and the first part of the scattering polarizer 31 The light in the same direction component of the two transmission axes 81 and the reflection axis 61 of the reflective polarizer 21 does not scatter and directly penetrates the scattering polarizer 31, and is reflected by the reflective polarizer 21 to form the same polarization as the reflection axis 61 Direction light (L3 '), and then directly penetrate the scattering polarizer 31 to form light (L4'), and the light components in the same direction as the second transmission axis 81 of the scattering polarizer 31 are directly penetrated Through, the intensity of the recovered light is almost not reduced, and can be better reflected back to the backlight 41, The backlight 41 'is used for reflection again, and in particular, the backlight 41' can also obtain higher light recycling efficiency through the reflective layer 41b. The light in the same direction as the scattering axis 71 of the scattering polarizing plate 31 has a certain polarization even if it is scattered, so that the scattering polarizing plate 31 can not only replace the conventional diffuser with a uniform light effect, because the scattering polarizing plate 31 The scattering axis 71 and the first transmission axis 51 of the reflective polarizing plate 21 are parallel to each other, so light can pass through the reflective polarizing plate 21 and the subsequent polarizing plate (not shown in the figure) of the subsequent liquid crystal display with better efficiency.
在本發明另一實施例之背光模組中，該反射式偏光板係選自多層膜式增亮膜、膽固醇液晶增亮膜、次波長金屬光柵和微結構偏振分離膜所組合的群組其中之一或其組合。In a backlight module according to another embodiment of the present invention, the reflective polarizer is selected from the group consisting of a multi-layer film brightness enhancement film, a cholesterol liquid crystal brightness enhancement film, a sub-wavelength metal grating, and a microstructure polarization separation film One or a combination thereof.
請配合參看第3圖所示，在本發明另一實施例之背光模組中，該散射式偏光板31之形成方式，例如可將各向異性材料31a分散於各向同性材料構成之基材31b中，並形成微胞而相分離，再經過延伸取向，使各向異性材料31a在各向同性材料構成之基材31b中沿延伸方向排列後，各向異性材料31a於各向同性材料構成之基材31b面內延伸方向具有異常光折射率，各向異性材料31a於各向同性材料構成之基材31b面內垂直延伸方向則具有尋常光折射率。當各向異性材料31a之異常光折射率與各向同性材料31b基材之折射率不一致，且各向異性材料31a之尋常光折射率與各向同性材料31b基材之折射率一致時，即可使通過該散射式偏光板31延伸方向分量之光線散射而具有散射軸71，且通過垂直延伸方向分量的光線穿透而具有第二穿透軸81。Please refer to FIG. 3, in a backlight module according to another embodiment of the present invention, the forming method of the scattering polarizing plate 31 can be, for example, to disperse the anisotropic material 31a on a substrate composed of an isotropic material In 31b, microcells are formed and phase separated, and then stretched and oriented, so that the anisotropic material 31a is arranged along the extension direction in the base material 31b composed of the isotropic material, the anisotropic material 31a is composed of the isotropic material The in-plane extension direction of the substrate 31b has an abnormal light refractive index, and the anisotropic material 31a has an ordinary light refractive index in the vertical extension direction of the in-plane of the substrate 31b made of an isotropic material. When the anomalous light refractive index of the anisotropic material 31a is not consistent with the refractive index of the isotropic material 31b substrate, and the ordinary light refractive index of the anisotropic material 31a is consistent with the refractive index of the isotropic material 31b substrate, that is The light passing through the extension direction component of the scattering polarizing plate 31 can be scattered to have a scattering axis 71, and the light passing through the vertical extension direction component can penetrate to have a second transmission axis 81.
在本發明另一實施例之背光模組中，該各向同性材料之折射率係介於1.4至1.7。In a backlight module of another embodiment of the present invention, the refractive index of the isotropic material is between 1.4 and 1.7.
在本發明另一實施例之背光模組中，該各向異性材料之異常光折射率與尋常光折射率之折射率差值係介於0.2至0.25，使偏振方向與該散射式偏光板之散射軸相同方向之光線可較佳地改變行進方向而散射。In a backlight module according to another embodiment of the present invention, the difference in refractive index between the anomalous refractive index of the anisotropic material and the ordinary refractive index is between 0.2 and 0.25, so that the polarization direction and the scattering polarizer Light rays with the same direction of the scattering axis can better change the direction of travel and be scattered.
在本發明另一實施例之背光模組中，該各向同性材料係選自由聚乙烯醇、聚烯烴類高分子、聚酯類高分子、聚醯胺類高分子和聚偏氟乙烯所構成的群組其中之一或其組合。In a backlight module of another embodiment of the present invention, the isotropic material is selected from the group consisting of polyvinyl alcohol, polyolefin-based polymer, polyester-based polymer, polyamide-based polymer, and polyvinylidene fluoride One of the groups or a combination of them.
在本發明另一實施例之背光模組中，該各向異性材料係選自由雙折射晶體、層列型液晶、膽固醇液晶、棒狀液晶、碟型液晶、柱型液晶、高分子液晶、扭轉向列型液晶、超扭轉向列型液晶以及雙折射樹脂所構成的群組其中之一或其組合。In a backlight module of another embodiment of the present invention, the anisotropic material is selected from the group consisting of birefringent crystals, smectic liquid crystals, cholesterol liquid crystals, rod-shaped liquid crystals, dish-shaped liquid crystals, columnar liquid crystals, polymer liquid crystals, and twisted One or a combination of nematic liquid crystal, super twisted nematic liquid crystal, and birefringent resin.
以上所述之實施例僅係為說明本發明之技術思想及特點，其目的在使熟習此項技藝之人士能夠瞭解本發明之內容並據以實施，當不能以之限定本發明之專利範圍，即大凡依本發明所揭示之精神所作之均等變化或修飾，仍應涵蓋在本發明之專利範圍內。The above-mentioned embodiments are only to illustrate the technical ideas and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, but cannot limit the patent scope of the present invention, That is to say, any equivalent changes or modifications made according to the spirit disclosed by the present invention should still be covered by the patent scope of the present invention.
1‧‧‧習知背光模組
11、11’‧‧‧背光模組
2、21‧‧‧反射式偏光板
3‧‧‧擴散板
31‧‧‧散射式偏光板
31a‧‧‧各向異性材料
31b‧‧‧各向同性材料構成之基材
4、41、41’‧‧‧背光源
41a‧‧‧導光層
41b‧‧‧反射層
5‧‧‧穿透軸
51‧‧‧第一穿透軸
6、61‧‧‧反射軸
71‧‧‧散射軸
81‧‧‧第二穿透軸
L、L’、L1、L1’、L2、L2’、L3、L3’、L4、L4’‧‧‧光線1‧‧‧Knowledge backlight module
11.11'‧‧‧Backlight module
2. 21‧‧‧Reflective polarizer
3‧‧‧Diffusion plate
31‧‧‧Scattering polarizer
31a‧‧‧Anisotropic material
31b‧‧‧ Base material composed of isotropic materials
4, 41, 41'‧‧‧ backlight
41a‧‧‧Light guide layer
41b‧‧‧Reflective layer
5‧‧‧penetrating shaft
51‧‧‧The first penetrating shaft
6, 61‧‧‧Reflection axis
71‧‧‧scattering axis
81‧‧‧Second penetrating shaft
L, L ', L1, L1', L2, L2 ', L3, L3', L4, L4'‧‧‧
第1圖：係為習知背光模組之剖面示意圖； 第2圖：係為本發明一實施態樣之背光模組之剖面示意圖； 第2’圖：係為本發明另一實施態樣之背光模組之剖面示意圖；以及 第3圖：係為本發明一實施態樣之背光模組之散射偏光板斜視示意圖。Figure 1: a schematic cross-sectional view of a conventional backlight module; Figure 2: a schematic cross-sectional view of a backlight module according to an embodiment of the present invention; Figure 2 ': a schematic view of another embodiment of the present invention A schematic cross-sectional view of a backlight module; and FIG. 3 is a schematic perspective view of a scattering polarizing plate of a backlight module according to an embodiment of the present invention.
Claims (9)
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| TW106116971A TWI631392B (en) | 2017-05-23 | 2017-05-23 | Backlight module |
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|---|---|---|---|
| TW106116971A TWI631392B (en) | 2017-05-23 | 2017-05-23 | Backlight module |
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| TW201901259A TW201901259A (en) | 2019-01-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200639502A (en) * | 2005-05-06 | 2006-11-16 | Jemitek Electronics Corp | Flat display module |
| TWI266907B (en) * | 2002-07-24 | 2006-11-21 | Nitto Denko Corp | Polarizing device, optical thin film using the same, and image display device using the same |
| US20070064168A1 (en) * | 2003-10-23 | 2007-03-22 | Nitto Denko Corporation | Optical element, light condensation backlight system, and liquid crystal display |
| TW200819844A (en) * | 2006-08-31 | 2008-05-01 | 3M Innovative Properties Co | Direct-lit backlight with angle-dependent birefringent diffuser |
| CN101742750A (en) * | 2008-11-11 | 2010-06-16 | 三星Sdi株式会社 | Backlight unit |
-
2017
- 2017-05-23 TW TW106116971A patent/TWI631392B/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI266907B (en) * | 2002-07-24 | 2006-11-21 | Nitto Denko Corp | Polarizing device, optical thin film using the same, and image display device using the same |
| US20070064168A1 (en) * | 2003-10-23 | 2007-03-22 | Nitto Denko Corporation | Optical element, light condensation backlight system, and liquid crystal display |
| TW200639502A (en) * | 2005-05-06 | 2006-11-16 | Jemitek Electronics Corp | Flat display module |
| TW200819844A (en) * | 2006-08-31 | 2008-05-01 | 3M Innovative Properties Co | Direct-lit backlight with angle-dependent birefringent diffuser |
| CN101742750A (en) * | 2008-11-11 | 2010-06-16 | 三星Sdi株式会社 | Backlight unit |
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| TW201901259A (en) | 2019-01-01 |
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