WO2012012977A1 - 一种背光模组及其加热器件 - Google Patents

一种背光模组及其加热器件 Download PDF

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Publication number
WO2012012977A1
WO2012012977A1 PCT/CN2010/078356 CN2010078356W WO2012012977A1 WO 2012012977 A1 WO2012012977 A1 WO 2012012977A1 CN 2010078356 W CN2010078356 W CN 2010078356W WO 2012012977 A1 WO2012012977 A1 WO 2012012977A1
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WIPO (PCT)
Prior art keywords
backlight module
heating device
cold cathode
cathode fluorescent
fluorescent tube
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
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PCT/CN2010/078356
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English (en)
French (fr)
Inventor
张庞岭
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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 US12/997,914 priority Critical patent/US8529079B2/en
Publication of WO2012012977A1 publication Critical patent/WO2012012977A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps

Definitions

  • the invention relates to a backlight module, in particular to a backlight module which is provided with a heating device and can be normally used in a low temperature environment, and belongs to the field of liquid crystal technology. Background technique
  • a liquid crystal is a substance between a liquid and a crystal. Its display principle is to change the molecular alignment state by applying different voltages to the liquid crystal, thereby controlling the throughput of light to display a wide variety of images. .
  • the liquid crystal itself does not emit light. It only controls the passage of light, so all liquid crystal panels require a backlight to provide illumination.
  • the cold cathode fluorescent lamp has the advantages of small lamp tube, simple structure, low surface temperature of the lamp tube, easy processing and forming, good color rendering and uniform light emission, and is considered to be an ideal backlight for the liquid crystal panel.
  • the cold cathode fluorescent tube is a closed gas discharge tube, and the ends of the tube are cold cathodes made of metal such as nickel, lanthanum and zirconium, and the cold cathode is an electrode that emits electrons without heating.
  • the lamp tube is filled with inert gas argon gas, and a small amount of helium and neon gas are charged as a catalyst for discharge, and a small amount of mercury vapor is also present.
  • the mercury volatilization in the cold cathode fluorescent tube is slow, the mercury vapor pressure is not high, and the amount of mercury ions in the tube is very limited, which may affect the startup and luminescence of the cold cathode fluorescent tube. Therefore, cold cathode
  • the starting voltage and the brightness of the fluorescent tube are related to the temperature environment in which the tube is placed.
  • the first method is a preheating method using an external heat source for heating.
  • an external heat source for heating for example, a well-known pair
  • the heating method of the LCD module is to form a semiconductor film-ITO film on a high-strength special glass substrate by vacuum evaporation or magnetron sputtering. After special processing, the film is processed. It becomes clear and transparent and has a certain conductivity. With its conductivity, it can be made into a heater inside the LCD module.
  • This method has the drawbacks of complicated process, difficulty in assembly, and low yield.
  • the second method is to apply excessive power when the LCD module is cold-started, so that the temperature of the cold-cathode fluorescent tube rises rapidly, which promotes the rapid evaporation of mercury into mercury vapor, thereby achieving rapid start-up of the lamp.
  • using the second method has the potential to affect the life of cold cathode fluorescent tubes and is therefore not an ideal solution. Summary of the invention
  • a primary object of the present invention to provide a backlight module provided with a heating device capable of starting normally in a low temperature environment.
  • a secondary object of the present invention is to provide a heating device for a backlight module.
  • the present invention adopts the following technical solutions:
  • a backlight module includes a back plate, a reflection sheet, a cold cathode fluorescent tube, an optical film, a panel and a front frame, wherein the backlight module There is also a heating device, and the heating device is located between the reflective sheet and the cold cathode fluorescent tube.
  • the heating device is a transparent film electric heater.
  • the transparent film electric heater is divided into three layers, wherein the upper and lower layers are transparent insulating materials, and the intermediate layer is a carbon fiber heating structure.
  • the backlight module further includes a temperature control device
  • the temperature control device includes a temperature control switch circuit and a plurality of thermocouples, wherein the thermocouple is mounted on the cold cathode fluorescent tube
  • the temperature control switch circuit is electrically connected to the power supply device of the heating device.
  • the heating device is closely attached to the cold cathode fluorescent tube and is fixed to the reflective sheet by bonding.
  • the present invention provides a heating device for a backlight module, wherein the heating device is the above-mentioned transparent film electric heater, which is located between the reflection sheet in the backlight module and the cold cathode fluorescent lamp.
  • the backlight module provided with the heating device provided by the invention can heat the cold cathode fluorescent lamp by heating the heating device in advance in a cold region, so that the temperature of the lamp can reach minus 10 ° C.
  • the above normal starting temperature avoids the use of over-power at low temperature start-up and reduces the impact on lamp life.
  • FIG. 1 is a schematic exploded view of a backlight module provided with a heating device according to the present invention
  • FIG. 2 is a schematic view of a transparent film electric heater as a heating device.
  • the core technical idea of the invention is to have a heating device built in the backlight module.
  • the heating device is integrally packaged with the panel, the back plate, the reflective sheet and the like in the backlight module, and is closely attached to the cold cathode fluorescent tube in the backlight module. Heat can be generated in a low temperature environment to heat the cold cathode fluorescent tube to prevent the tube from starting at a lower temperature. The following will be further explained in conjunction with Figs. 1 and 2.
  • FIG. 1 is an exploded perspective view showing a backlight module provided with a heating device according to the present invention.
  • the backlight module mainly comprises the following components: a back plate 10, a reflective sheet 20, a transparent film electric heater 30, a cold cathode fluorescent tube 40, an optical film 50, a panel 60, and a front frame 70.
  • the back plate 10 When the backlight module is assembled, the back plate 10, the reflective sheet 20, the transparent film electric heater 30, the cold cathode fluorescent tube 40, the optical film 50, the panel 60, and the front frame 70 are sequentially stacked and assembled into one.
  • the overall backlight module wherein the transparent film electric heater 30 is located between the reflective sheet 20 and the cold cathode fluorescent tube 40.
  • the setting of the transparent film electric heater 30 is a main technical feature of the backlight module.
  • the backlight module is assembled by applying the above-mentioned transparent film electric heater 30 at the bottom of the cold cathode fluorescent tube, and then fixing the transparent film electric heater 30 by bonding using a thermosetting glue or a high temperature optical glue. On the bottom of the reflection sheet 20.
  • the transparent film is first electrically heated.
  • the device 30 supplies power to preheat the cold cathode fluorescent tube located above it by the heat generated by the transparent film electric heater 30 to enable it to reach a normal starting temperature range.
  • the transparent thin film electric heater 30 used in the present invention is divided into three layers, wherein the upper and lower layers are transparent insulating materials, in the middle.
  • the layer is a carbon fiber heating structure.
  • the principle of carbon fiber heating is that under the excitation of electricity, the "Brown motion" is generated in the thermal component by electrons, and the thermal energy is generated by the mutual impact and friction between the electrons, so the electrothermal energy conversion rate can reach 99.99% or more.
  • the surface temperature of the carbon fiber heating structure is rapidly increased, and the heat energy is transmitted to the transparent insulating material covering the surface of the carbon fiber heating structure, so that the surface temperature of the upper and lower transparent insulating materials is continuously increased, thereby being able to Cold cathode fluorescence is used for fast and efficient heating.
  • the use of a carbon fiber heating structure in the transparent film electric heater 30 has an advantage in that the carbon fiber structure is soft and unbreakable, so that the service life is long.
  • FIG. 2 shows the transparent film electric heater 30 used in the backlight module.
  • the transparent film electric heater 30 is composed of a film body and a power supply device (not shown), and is connected to a power source through a wire.
  • a temperature control device (not shown) may be disposed in the backlight module.
  • the temperature control device includes a temperature control switch circuit and a plurality of thermocouples.
  • the thermocouple is installed at the cold cathode fluorescent tube to collect the temperature data of the cold cathode fluorescent tube in real time. This temperature data is sent to the temperature control switch circuit.
  • the temperature control switch circuit is electrically connected to the power supply device of the transparent film electric heater 30.
  • the temperature control switch circuit When the temperature of the cold cathode fluorescent tube is lower than the temperature required for normal startup (above 10 ° C), the temperature control switch circuit turns on the power supply device of the transparent film electric heater 30 to make the transparent film electrically
  • the heater 30 begins to preheat, so that the cold cathode fluorescent tube reaches the normal starting temperature range; and when the temperature of the cold cathode fluorescent tube is higher than the temperature required for normal starting (above 10 ° C), no need to pre- The heating operation, therefore, the temperature control switch circuit automatically cuts off the power supply of the transparent film electric heater 30 to avoid unnecessary energy consumption.
  • the above temperature control switch circuit is similar to the temperature control circuit of the electric blanket. Conventional designs that can be grasped by those skilled in the art are not described in detail herein.
  • the backlight module provided with the heating device provided by the present invention can heat the cold cathode fluorescent lamp by heating the heating device in advance in a cold region, so that the temperature of the lamp can be reached.
  • the normal starting temperature above 10 °C thus avoiding the use of over-power at low temperature start-up, reducing the impact on lamp life.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Description

一种背光模组及其加热器件
技术领域
本发明涉及一种背光模组， 尤其涉及一种设有加热器件、 能够 在低温环境下正常使用的背光模组， 属于液晶技术领域。 背景技术
液晶 （LCD) 是一种介乎于液体和晶体之间的物质， 其显示原 理是通过给液晶施加不同的电压来改变其分子排列状态，从而控制光 线的通过量， 以便显示多种多样的图像。 而液晶自身并不会发光， 它 只是控制光线的通过与否，因此所有的液晶面板都需要背光源来提供 照明。
目前， 大多数液晶面板都使用冷阴极荧光灯管 （Cold Cathode Fluorescent Lamp， CCFL)作为背光源。冷阴极荧光灯管具有灯管细小、 结构简单、 灯管表面温度低、 易加工成形、 显色性好、 发光均匀等优 点， 被认为是液晶面板的理想背光源。
冷阴极荧光灯管是一个密闭的气体放电管，其灯管的两端是采用 镍、钽和锆等金属做成的冷阴极， 该冷阴极是无需加热即可发射电子 的电极。灯管内填充的主要是惰性气体氩气， 另外充入少量的氖气和 氪气作为放电的触媒， 此外还有少量的汞蒸气。在低温情况下， 由于 冷阴极荧光灯管内的汞挥发较慢， 汞蒸气气压不高， 灯管内的汞离子 数量十分有限， 会影响冷阴极荧光灯管的启动和发光。 因此， 冷阴极 荧光灯管的启动电压和发光亮度与灯管所处的温度环境有关。
目前， 改善冷阴极荧光灯管低温特性的可靠办法主要有以下两 种。第一种方法是利用外部热源进行加热的预热方法。例如公知的对
LCD模组进行加热的方法， 是在一片高强度特种玻璃基片上， 采用 真空蒸发或是磁控溅射的方法， 生长出一层半导体薄膜一 ITO膜， 经 专门工艺处理后， 该层薄膜就变得清澈透明并具有一定的导电性， 利 用其导电性， 就可以制作成 LCD模组内部的加热器。 但是， 该方法 存在工艺复杂、 难于组装且成品率低的缺陷。 第二种方法是在 LCD 模组低温启动时施加过功率， 使冷阴极荧光灯管的温度迅速上升， 促 使汞快速蒸发为汞蒸气， 从而实现灯管快速启动。但是， 使用第二种 方法有可能影响冷阴极荧光灯管的寿命，因此并不是一种理想的解决 方案。 发明内容
为解决现有技术中存在的问题， 本发明的主要目的在于提供一 种设有加热器件、 能够在低温环境下正常启动的背光模组。
本发明的次要目的在于提供一种用于背光模组的加热器件。 为实现上述的发明目的， 本发明采用下述的技术方案： 一种背光模组，包括背板、反射片、冷阴极荧光灯管、光学膜片、 面板和前框， 其中在所述背光模组中还具有加热器件， 所述加热器件 位于所述反射片与所述冷阴极荧光灯管之间。
在本发明的一实施例中， 所述加热器件为透明薄膜电加热器。 在本发明的一实施例中， 所述透明薄膜电加热器分为三层， 其中 上下两层均为透明绝缘材料， 中间层为碳纤维发热结构。
在本发明的一实施例中， 所述背光模组中还具有温控装置， 所述 温控装置包括温控开关电路和多个热电偶，其中所述热电偶安装在所 述冷阴极荧光灯管处，所述温控开关电路与所述加热器件的供电装置 电连接。
在本发明的一实施例中，所述加热器件与所述冷阴极荧光灯管紧 密贴合， 并通过粘接的方式固定在所述反射片上。
再者， 本发明提供一种用于背光模组的加热器件， 所述加热器件 为上述的透明薄膜电加热器，位于背光模组中的反射片与冷阴极荧光 灯管之间。
本发明所提供的设有加热器件的背光模组在寒冷的地域， 可以 通过预先对加热器件供电，使其产生热量来对冷阴极荧光灯管进行加 热， 使其灯管温度能够达到零下 10°C以上的正常启动温度， 从而避 免了在低温启动时采用过功率， 减少对灯管寿命的影响。 附图说明
图 1为本发明所提供的设有加热器件的背光模组的结构分解示 意图；
图 2为作为加热器件的透明薄膜电加热器的示意图。 具体实施方式 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。 再者， 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。
本发明的核心技术理念是在背光模组中内置加热器件。 该加热 器件与背光模组中的面板、 背板、 反射片等一并封装为一个整体， 并 与背光模组中的冷阴极荧光灯管紧密贴合。在低温环境下可以产生热 量来对冷阴极荧光灯管进行加热，从而避免灯管在较低温度条件下启 动。 以下将配合图 1和图 2作更进一步的说明。
图 1为本发明所提供的设有加热器件的背光模组的结构分解示 意图。 该背光模组主要包括以下的组成部分： 背板 10、 反射片 20、 透明薄膜电加热器 30、冷阴极荧光灯管 40、光学膜片 50、面板 (panel) 60、 前框 70。 在背光模组组装时， 该背板 10、 反射片 20、 透明薄膜 电加热器 30、 冷阴极荧光灯管 40、 光学膜片 50、 面板 60、 前框 70 依序叠合在一起， 组装成一个整体的背光模组， 其中透明薄膜电加热 器 30位于反射片 20与冷阴极荧光灯管 40之间。
透明薄膜电加热器 30的设置是本背光模组的一个主要技术特 点。该背光模组在组装时， 通过在冷阴极荧光灯管的底部施加上述的 透明薄膜电加热器 30， 然后使用热固胶或者高温光学胶， 通过粘接 的方式把透明薄膜电加热器 30固定在底部的反射片 20上。这样， 当 背光模组处在低于零下 10°C的低温环境中， 首先对透明薄膜电加热 器 30供电，通过透明薄膜电加热器 30产生的热量对位于其上方的冷 阴极荧光灯管进行预加热， 使其能够到达正常的启动温度范围。
与现有技术中的电加热器多采用铜镍合金绕制所不同的是， 本 发明中所使用的透明薄膜电加热器 30分为三层结构， 其中上下两层 均为透明绝缘材料， 中间层为碳纤维发热结构。碳纤维发热的原理是 在电的引发激励下， 通过电子在热组件中产生 "布朗运动"， 由电子 间的互相撞击和摩擦从而产生热能， 因此电热能转换率可以达到为 99.99%以上。在通电几十秒内，碳纤维发热结构的表面温度迅速升高， 并将热能传递给覆盖在碳纤维发热结构表面的透明绝缘材料，使上下 两层透明绝缘材料的表面温度不断升高，从而能够对冷阴极荧光进行 快速有效的加热。 在透明薄膜电加热器 30中使用碳纤维发热结构还 有一个优点， 就是碳纤维结构柔软， 不宜折断， 因此使用寿命较长。
图 2显示了本背光模组中使用的透明薄膜电加热器 30。 该透明 薄膜电加热器 30由薄膜本体和供电装置 （图中未示） 组成， 并通过 导线连接电源。
为了减少能源的消耗， 同时避免冷阴极荧光灯管温度过高， 可 以在背光模组中设置温控装置 （图中未示）。 该温控装置包括温控开 关电路和多个热电偶。其中热电偶安装在冷阴极荧光灯管处， 用于实 时采集冷阴极荧光灯管的温度数据。 该温度数据送入温控开关电路 中。 温控开关电路与透明薄膜电加热器 30的供电装置电连接。 当冷 阴极荧光灯管的温度低于正常启动所需的温度 (零下 10°C以上)时，温 控开关电路接通透明薄膜电加热器 30的供电装置， 使透明薄膜电加 热器 30开始进行预加热， 从而使冷阴极荧光灯管到达正常的启动温 度范围； 而当冷阴极荧光灯管的温度高于正常启动所需的温度 (零下 10°C以上)时， 不再需要预加热操作， 因此温控开关电路自动切断透 明薄膜电加热器 30的电源供应， 以避免不必要的能源消耗。 上述的 温控开关电路与电热毯的温控电路类似。作为本领域普通技术人员都 能掌握的常规设计， 在此就不详细赘述了。
如上所述， 本发明所提供的设有加热器件的背光模组在寒冷的 地域， 可以通过预先对加热器件供电， 使其产生热量来对冷阴极荧光 灯管进行加热， 使其灯管温度能够达到零下 10°C以上的正常启动温 度， 从而避免了在低温启动时采用过功率， 减少对灯管寿命的影响。
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， 包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。

Claims

权 利 要 求
1. 一种背光模组， 包括背板、 反射片、冷阴极荧光灯管、光学膜片、 面板和前框， 其特征在于：
所述背光模组中还具有加热器件，所述加热器件位于所述反射片 与所述冷阴极荧光灯管之间；
其中所述加热器件与所述冷阴极荧光灯管紧密贴合，并固定在所 述反射片上； 及所述背光模组中还具有温控装置， 所述温控装置 包括温控开关电路和多个热电偶，其中所述热电偶安装在所述冷 阴极荧光灯管处，所述温控开关电路与所述加热器件的供电装置 电连接。
2. 一种背光模组， 包括背板、 反射片、冷阴极荧光灯管、光学膜片、 面板和前框， 其特征在于：
所述背光模组中还具有加热器件，所述加热器件位于所述反射片 与所述冷阴极荧光灯管之间。
3. 如权利要求 2所述的背光模组， 其特征在于：
所述加热器件为透明薄膜电加热器。
4. 如权利要求 3所述的背光模组， 其特征在于：
所述透明薄膜电加热器分为三层，其中上下两层均为透明绝缘材 料， 中间层为碳纤维发热结构。
5. 如权利要求 2所述的背光模组， 其特征在于：
所述加热器件与所述冷阴极荧光灯管紧密贴合，并通过粘接的方 式固定在所述反射片上。
6. 如权利要求 2所述的背光模组， 其特征在于：
所述背光模组中还具有温控装置，所述温控装置包括温控开关电 路和多个热电偶， 其中所述热电偶安装在所述冷阴极荧光灯管 处， 所述温控开关电路与所述加热器件的供电装置电连接。
7. 一种用于背光模组的加热器件， 其特征在于：
所述加热器件为透明薄膜电加热器，位于背光模组中的反射片与 冷阴极荧光灯管之间。
8. 如权利要求 7所述的用于背光模组的加热器件， 其特征在于： 所述透明薄膜电加热器分为三层，其中上下两层均为透明绝缘材 料， 中间层为碳纤维发热结构。
PCT/CN2010/078356 2010-07-29 2010-11-02 一种背光模组及其加热器件 Ceased WO2012012977A1 (zh)

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CN102540522A (zh) * 2012-03-19 2012-07-04 中航华东光电有限公司 一种改善型液晶显示模块及其加固方法
CN102889525B (zh) * 2012-10-18 2016-03-30 深圳市华星光电技术有限公司 一种液晶模组及其液晶显示器
CN110634400B (zh) * 2019-08-22 2021-04-27 武汉华星光电技术有限公司 背光模组、显示装置及背光模组的制作方法

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