WO2011091557A1 - 偏振光转换装置及由其组成的车用灯与液晶显示装置 - Google Patents

偏振光转换装置及由其组成的车用灯与液晶显示装置 Download PDF

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Publication number
WO2011091557A1
WO2011091557A1 PCT/CN2010/000386 CN2010000386W WO2011091557A1 WO 2011091557 A1 WO2011091557 A1 WO 2011091557A1 CN 2010000386 W CN2010000386 W CN 2010000386W WO 2011091557 A1 WO2011091557 A1 WO 2011091557A1
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WIPO (PCT)
Prior art keywords
polarized light
beam splitter
light
liquid crystal
conversion device
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PCT/CN2010/000386
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English (en)
French (fr)
Inventor
李冠军
刘凤峰
李启航
Original Assignee
Li Guanjun
Liu Fengfeng
Li Qihang
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Application filed by Li Guanjun, Liu Fengfeng, Li Qihang filed Critical Li Guanjun
Publication of WO2011091557A1 publication Critical patent/WO2011091557A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/135—Polarised
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles

Definitions

  • the present invention relates to a light conversion device, and more particularly to a polarization conversion device.
  • the present invention also relates to a liquid crystal display device comprising the polarization conversion device.
  • the present invention also relates to a polarization conversion device. Automotive lighting and signal indicators.
  • the liquid crystal screen requires polarized light, and the polarized light in the other orthogonal direction is often wasted. To avoid waste, it is necessary to convert the polarization direction of the polarized light to make it useful polarized light.
  • the most important polarization conversion device is a slide glass.
  • the structure is generally characterized in that the polarized light-splitting film is vapor-deposited on the glass to be split, and the separated "waste light" is subjected to polarization conversion by the wave plate.
  • Such a splitting mode generally adopts a light oblique angle of 45 degrees, is stacked by a glass strip, has a complicated structure, is complicated in an evaporation process, and has a high overall cost.
  • PBS polarization converter Such as PBS polarization converter.
  • the overall device is not used in displays and LCD TVs because it is inconvenient and thin, and is mainly used in projection displays.
  • a reflective polarizer is used as the beam splitting device, and the polarization of the returned light still requires a wave plate. Because the cost of the wave plate is relatively high, today, as the LCD screen gets bigger and bigger, the wave plate also needs to be large, so the cost will be unacceptably high.
  • the current technical solution is to provide a polarizing plate on the glass bulb of the automobile headlight. The problem with this is that the brightness of the headlights is reduced by half. Caused a waste of light energy. If you want to increase the power of the headlights, it will change the circuit performance of the car, posing a danger to driving safety. It also causes a waste of light energy.
  • the technical problem to be solved by the present invention is to provide a polarized light conversion device which is more rational in design, more compact in structure, less expensive, and has higher polarization conversion efficiency.
  • Another technical problem to be solved by the present invention is to provide a liquid crystal display device comprising the above-described polarized light converting device.
  • Still another technical problem to be solved by the present invention is to provide a lighting and signal indicator for a vehicle comprising the above-described polarized light converting device.
  • the technical problem to be solved by the present invention is achieved by the following technical solutions.
  • the present invention is a polarized light conversion device, which is characterized in that it comprises a light source, a reflective bowl and a polarizing beam splitter; the polarizing beam splitter is disposed on the light entering and exiting side of the reflective bowl, and the polarizing beam splitter is a metal wire A grating-type polarization beam splitter or a reflective polarizer.
  • the technical problem to be solved by the present invention can be further achieved by the following technical solutions.
  • the polarized light conversion device described above is characterized in that the reflective bowl is a single reflective bowl or a lattice surface composed of a plurality of reflective bowls.
  • the technical problem to be solved by the present invention can be further achieved by the following technical solutions.
  • the polarized light conversion device described above is characterized in that a light-transmitting sheet is provided on both sides of the polarization beam splitter.
  • the technical problem to be solved by the present invention can be further achieved by the following technical solutions.
  • the polarized light conversion device described above is characterized in that the light transmissive sheet is a light homogenizing plate.
  • the technical problem to be solved by the present invention can be further achieved by the following technical solutions.
  • the present invention also discloses a liquid crystal display device characterized in that it comprises a polarization conversion device and a liquid crystal panel as described in the above technical solution, and the polarized light conversion device supplies polarized light to the liquid crystal panel.
  • the technical problem to be solved by the present invention can be further achieved by the following technical solutions.
  • the present invention also discloses an illumination or signal indicator for a vehicle, characterized in that it comprises a polarization conversion device as described in the above technical solution.
  • the polarization conversion principle of the polarization conversion device of the present invention is as follows:
  • the polarization beam splitter is a metal wire grid structure
  • the light reflected back by the polarizing beam splitter passes through the reflection of the reflective bowl and becomes partially polarized.
  • Part of the polarized light can be decomposed into two parts parallel and perpendicular to the polarization beam splitter metal grid, and again from left to right toward the polarizing beam splitter, repeating the process of Figures 4 to 5, and repeating until the light energy is fully utilized. .
  • the polarizing beam splitter is a reflective polarizer
  • the polarized light having a polarization direction parallel to the polarization direction of the reflective polarizer passes, and the light perpendicular thereto is reflected.
  • the principle of partial conversion is the same as above.
  • the technical effect of the invention is mainly that the structure is compact, the manufacturing process is simple, the light energy utilization rate is high, and the cost is low.
  • the prior art utilizes a polarizing beam splitting film to split light, generally requiring tilting 45 The angle is incident, the structure is complex, and the space is large. It requires multiple evaporations in production, which is complicated in process and high in cost.
  • the polarizing beam splitter used in the present invention is of a direct type and has a more compact structure. The process of fabricating the upper wire-type polarizing beam splitter is much simpler than evaporation.
  • the reflective polarizer has a slightly complicated process, it is easy to be mass-produced and has a low cost as the metal wire grid type polarizing beam splitter.
  • the polarization conversion device of the present invention After a plurality of cycles of light between the polarization beam splitter and the reflector bowl, most of the light energy can be substantially emitted from the polarization beam splitter except for a small reflection loss. In combination with this type of direct polarized beam splitter and reflective bowl, this structure results in very little light escaping (see Figure 2-3). Therefore, the total light energy utilization rate is high.
  • the cost of the wave plate is relatively high, and the cost of the large-sized wave plate is unacceptably high.
  • the polarization beam splitter and the reflector bowl in the technique of the present invention are inexpensive, and it is easy to realize a large size.
  • a liquid crystal display device is composed of the polarized light conversion device and the liquid crystal panel according to the present invention. Since the polarization conversion device can efficiently provide polarized light to the liquid crystal panel, the liquid crystal display can be omitted. A plastic polarizer on the light side. When the display requirement is monochrome or black and white, the polarization beam splitter and the liquid crystal panel in the polarization conversion device can be fabricated together in the actual production process. The specific position may vary depending on the material of the polarizing beam splitter, or on the outside of the glass on the light-incident side of the liquid crystal panel, or between the glass on the light-incident side and the IT0 electrode, or between the IT0 electrode on the light-incident side and the liquid crystal. .
  • the polarization conversion device of the present invention When the polarization conversion device of the present invention is applied to an automobile lamp, the high-density polarized light is obtained, and the structure of the existing headlights is hardly changed, the power of the lamp is not increased, and the electrical structure of the automobile is not changed, and the implementation is extremely convenient.
  • 1 is a schematic structural view of a polarized light conversion device of the present invention.
  • 2 is a schematic view showing the operation of the light emitted by the light source in the polarized light conversion device of the present invention after being reflected by the reflective bowl and reaching the polarization beam splitter and being reflected.
  • Fig. 3 is a schematic view showing the operation of the light emitted from the light source in the polarized light conversion device of the present invention directly directed to the polarizing beam splitter and reflected.
  • 4-6 are schematic diagrams of polarization conversion in a polarized light conversion device of the present invention.
  • Example 1 Refer to Figure 1-3.
  • a polarized light conversion device comprising a light source 2, a reflective bowl 1 and a polarizing beam splitter 3; the polarizing beam splitter 3 is disposed on the side of the light entering and exiting the reflective bowl 1, and the polarizing beam splitter 3 is a metal grid A polarizing beam splitter or a reflective polarizer. .
  • the reflective bowl 1 is a single reflective bowl 1 or a lattice surface composed of a plurality of reflective bowls 1.
  • Example 3 In the polarization conversion device according to the first or second aspect, the light-transmitting sheet is provided on both sides of the polarization beam splitter.
  • Example 4 In the polarization conversion device of Embodiment 3, the light-transmitting sheet is a light-shading plate.
  • Example 5 A liquid crystal display device comprising the polarized light converting device according to any one of embodiments 1 to 4 and a liquid crystal panel, wherein the polarized light converting device supplies polarized light to the liquid crystal panel.
  • Example 6 A vehicular illumination or signal indicator, comprising the polarized light conversion device of any of embodiments 1-4.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Polarising Elements (AREA)

Description

偏振光转换装置及由其组成的车用灯与液晶显示装置 技术领域
本发明涉及一种光的转换利用装置， 特别是一种偏振光转换装置； 本发 明还涉及一种由该偏振光转换装置组成液晶显示装置； 本发明还涉及一种由 该偏振光转换装置组成的车用照明及信号指示灯。
背景技术
在液晶显示技术中， 液晶屏需要的是偏振光， 另一正交方向的偏振光往 往被浪费， 如要避免浪费则需要对偏振光的偏振方向进行转换， 使之成为有 用的偏振光。 当前最主要的偏振转换器件是玻片， 结构上一般是使用在玻璃 上蒸镀偏振分光膜的方式先进行分光， 被分出的 "废光"再通过波片进行偏 振转换。此种分光模式一般采用光线倾斜 45度角入射，采用玻璃条块堆叠式， 结构复杂， 蒸镀工艺复杂， 整体成本也较高。 如 PBS偏振转换器。 整体器件 因不方便超薄化， 故没有用在显示器和液晶电视上， 而主要用在投影显示中。 在边打灯式的背光模组中， 有用到反射型偏振片作为分光器件， 被分返回的 光线其偏振态的转换仍然需要用波片。 因波片成本比较高昂， 这在液晶屏越 做越大的今天， 波片也同样需要很大， 如此成本将高到无法接受。 目前也有 一些其他形式的偏振转换装置， 但不是结构复杂， 就是工艺复杂， 很难有令 人满意的方式。
汽车在夜晚会车时， 汽车大灯如果能出射偏振光， 在司机的视线前设置 偏振片， 将可以做到让司机看不到对方车大灯的光但可以看到自己车大灯的 光。 让夜晚行车视野清晰， 行车更安全。 目前的技术方案是在汽车大灯的玻 壳上设置偏振片。 如此带来的问题是大灯的亮度减低了一半。 造成了光能的 浪费。 如果要增加大灯的功率则会改变汽车的电路性能， 给行车安全带来危 险。 同样也会造成光能的浪费。
发明内容
本发明所要解决的技术问题是针对现有技术的不足， 提供一种设计更为 合理、 结构更为紧凑、 较廉价且具较高偏振光转换效率的偏振光转换装置。
本发明所要解决的另一个技术问题是提供了一种由上述偏振光转换装置 组成液晶显示装置。
本发明所要解决的再一技术问题是提供了一种由上述偏振光转换装置组 成的车用照明及信号指示灯。
本发明所要解决的技术问题是通过以下的技术方案来实现的。 本发明是 一种偏振光转换装置， 其特点是， 它包括光源、 反光碗和偏振分光片； 所述 的偏振分光片设置在反光碗的进出光一侧， 且所述的偏振分光片为金属线栅 型偏振分光片或反射型偏振片。
本发明所要解决的技术问题还可以通过以下的技术方案来进一步实现。 以上所述的偏振光转换装置， 其特点是， 所述反光碗为单个反光碗或者是由 若干反光碗组成的点阵面。
本发明所要解决的技术问题还可以通过以下的技术方案来进一步实现。 以上所述的偏振光转换装置， 其特点是， 在偏振分光片的两侧设有透光片。
本发明所要解决的技术问题还可以通过以下的技术方案来进一步实现。 以上所述的偏振光转换装置， 其特点是， 所述的透光片为匀光板。 本发明所要解决的技术问题还可以通过以下的技术方案来进一步实现。 本发明还公开了一种液晶显示装置， 其特点是， 它包括如以上技术方案所述 的偏振光转换装置和液晶屏， 且由所述的偏振光转换装置为液晶屏提供偏振 光。
本发明所要解决的技术问题还可以通过以下的技术方案来进一步实现。 本发明还公开了一种车用照明或信号指示灯， 其特点是， 它包括如以上技术 方案所述的偏振光转换装置。
本发明偏振转换装置的偏振转换原理如下：
当偏振分光片为金属线栅结构时：
如图 4,我们可以把自然光分解成偏振方向与偏振分光片金属线栅平行和 垂直的两部分， 并且自左向右射向彩色偏振分光片。
如图 5， 到达偏振分光片后， 偏振方向与偏振分光片金属线栅垂直的偏振 光线通过， 而与其平行的光线被反射。
如图 6，被偏振分光片反射回去的光线经过反光碗的反射后又变成部分偏 振光。 部分偏振光又可以分解为与偏振分光片金属线栅平行和垂直的两部分， 重新再次自左向右射向偏振分光片， 重复图 4至 5的过程， 如此反复， 直至 光能被充分利用。
当偏振分光片为反射型偏振片时， 光线到达反射型偏振片后， 偏振方向 与反射型偏振片偏振方向平行的偏振光线通过， 而与其垂直的光线被反射。 偏正转换原理同上。
与现有技术相比， 本发明技术效果主要是其结构紧凑， 制作工艺简单， 光能利用率高， 成本低廉。 现有技术利用偏振分光膜分光， 一般需要倾斜 45 度角入射， 结构复杂， 占用空间较大。 制作上需要多次蒸镀， 工艺复杂， 成 本高。 本发明所用偏振分光片为直射型， 结构更紧凑。 制作上金属线栅型偏 振分光片工艺较蒸镀简单的多。 反射型偏振片虽工艺稍复杂， 但其和金属线 栅型偏振分光片一样， 都便于规模化生产， 成本较低。
本发明中的偏振转换装置中， 光在偏振分光片和反光碗之间经过若干次 循环后， 除了较小的反射损失外， 绝大部分的光能基本上都可以从偏振分光 片出射。 加之这种直射型偏振分光片和反光碗组合成的此种结构导致光线极 少逃逸 （见图 2-3)。 因此总的光能利用率很高。
现有技术中波片的成本较高， 大尺寸的波片成本更是高得无法接受。 而 本发明技术中的偏振分光片和反光碗却很便宜， 也容易实现大尺寸。
本发明所述的一种液晶显示装置， 是由本发明所述的偏振光转换装置和 液晶屏组成， 由于偏振转换装置己经可以高效提供偏振光给液晶屏使用， 因 此可以省去液晶屏中入光一侧的塑料偏振片。 当显示要求为单色或黑白色时， 在实际生产制作过程中， 可以将偏振光转换装置中的偏振分光片和液晶屏制 作在一起。 具体位置可根据偏振分光片用材的不同而不同， 或在液晶屏入光 一侧的玻璃的外侧， 或在入光一侧的玻璃和 IT0 电极之间， 或在入光一侧的 IT0电极和液晶之间。
本发明偏振转换装置应用在汽车灯上时， 在获得高效偏振光的同时， 几 乎不用改变现有车大灯的结构， 不用增加灯的功率， 也不用改变汽车的电器 结构， 实施极其方便。
附图说明
图 1为本发明偏振光转换装置的一种结构示意图。 图 2 为本发明偏振光转换装置中光源发出的光经反光碗反射后到达偏振 分光片并被反射后的运行示意图。
图 3 为本发明偏振光转换装置中光源发出的光直接射向偏振分光片并被 反射后的运行示意图。
图 4-6为本发明偏振光转换装置中偏振光转换原理图。
具体实施方式
以下参照附图， 进一步描述本发明的具体技术方案， 以便于本领域的技 术人员进一步地理解本发明， 而不构成对其权利的限制。
实施例 1。 参照图 1-3。 一种偏振光转换装置， 它包括光源 2、 反光碗 1 和偏振分光片 3 ; 所述的偏振分光片 3设置在反光碗 1的进出光一侧， 且所述 的偏振分光片 3为金属线栅型偏振分光片或反射型偏振片。 .
实施例 2。在实施例 1所述的偏振光转换装置中， 所述反光碗 1为单个反 光碗 1或者是由若干反光碗 1组成的点阵面。
实施例 3。在实施例 1或 2所述的偏振光转换装置中， 在偏振分光片的两 侧设有透光片。
实施例 4。在实施例 3所述的偏振光转换装置中，所述的透光片为匀光板。 实施例 5。 一种液晶显示装置， 它包括实施例 1-4任何一项所述的偏振光 转换装置和和液晶屏， 且由所述的偏振光转换装置为液晶屏提供偏振光。
实施例 6。 一种车用照明或信号指示灯， 它包括实施例 1-4任何一项所述 的偏振光转换装置。

Claims

权 利 要 求 书 、 一种偏振光转换装置， 其特征在于， 它包括光源 （2)、 反光碗 （1) 和 偏振分光片 （3); 所述的偏振分光片 （3) 设置在反光碗（1) 的进出光 一侧， 且所述的偏振分光片 （3) 为金属线栅型偏振分光片或反射型偏 振片
、 根据权利要求 1所述的偏振光转换装置， 其特征在于， 所述反光碗（1) 为单个反光碗 （1) 或者是由若干反光碗 （1) 组成的点阵面。
、 根据权利要求 1或 2所述的偏振光转换装置， 其特征在于， 在偏振分光 片 （3) 的两侧设有透光片。
、 根据权利要求 3所述的偏振光转换装置， 其特征在于， 所述的透光片为 匀光板。
、 一种液晶显示装置， 其特征在于， 它包括权利要求 1-4任何一项所述的 偏振光转换装置和液晶屏， 且由所述的偏振光转换装置为液晶屏提供偏 振光。
、 一种车用照明或信号指示灯， 其特征在于， 它包括权利要求 1-4任何一 项所述的偏振光转换装置。
PCT/CN2010/000386 2010-01-26 2010-03-26 偏振光转换装置及由其组成的车用灯与液晶显示装置 WO2011091557A1 (zh)

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