WO2013166768A1 - 在立体模式下改变震荡频率的背光模组及其液晶显示器 - Google Patents

在立体模式下改变震荡频率的背光模组及其液晶显示器 Download PDF

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Publication number
WO2013166768A1
WO2013166768A1 PCT/CN2012/077686 CN2012077686W WO2013166768A1 WO 2013166768 A1 WO2013166768 A1 WO 2013166768A1 CN 2012077686 W CN2012077686 W CN 2012077686W WO 2013166768 A1 WO2013166768 A1 WO 2013166768A1
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Prior art keywords
frequency
liquid crystal
crystal display
switch circuit
resistor
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PCT/CN2012/077686
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English (en)
French (fr)
Inventor
林柏伸
廖良展
杨翔
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/813,075 priority Critical patent/US9058781B2/en
Publication of WO2013166768A1 publication Critical patent/WO2013166768A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30Image reproducers
    • H04N13/398Synchronisation thereof; Control thereof
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30Image reproducers
    • H04N13/356Image reproducers having separate monoscopic and stereoscopic modes

Definitions

  • Backlight module for changing oscillation frequency in stereo mode and liquid crystal display thereof
  • the present invention relates to a liquid crystal display, and more particularly to a liquid crystal display having a backlight module having different oscillation frequencies when displaying any of a planar image or a stereoscopic image. Background technique
  • FIG. 1 is a timing diagram of a power consumption of an oscillator and a backlight module when a liquid crystal display displays a planar image.
  • the oscillator is a high-level signal
  • the backlight module is also at a high level, indicating that the backlight module provides a light source to the panel, and the power of the backlight module is Wl.
  • FIG. 2 is a timing diagram of the power consumption of the oscillator and the backlight module when the liquid crystal display displays the stereo image.
  • the frequency of the oscillator is the same as the frequency of the oscillator when the plane image is displayed in Figure 1. Because the liquid crystal display displays the stereo image, one image must display the right eye image and the left eye image sequentially, so the backlight module's illumination frequency is reduced. In order to maintain the brightness of the screen, the backlight module increases the power of the light source. Therefore, when the backlight module is at a high level, the backlight module provides a light source to the liquid crystal panel, and the power of the backlight module is W2. It is assumed that the power of the annihilation is proportional to the brightness of the light source. In the stereo image, the power W2 that is consumed when the backlight module illuminates the light source is two of the power W1 that is consumed when the backlight module illuminates the light source in the display plane image. Times.
  • the backlight module when the liquid crystal display displays a planar image, and the backlight module provides a light source to the panel, the backlight module illuminates the light source with a current of 120 mA; when the liquid crystal display displays a stereoscopic image, and the backlight module provides the light source to When the panel is used, the backlight module illuminates the light source with a current of 240 mA.
  • the current output when displaying a stereo image is twice the current when displaying a flat image, and the power output at this time is twice as large. Under the same conditions, it only needs to withstand 120 mA of magnetic material. When displaying stereo images, the choice of magnetic material becomes 240 mA. At this time, in the selection of magnetic materials, it is necessary to select a material that can bear 240 mA, which causes waste of materials and an increase in cost.
  • the present invention provides a liquid crystal display for displaying a planar image or a stereoscopic image thereof. Any of the images in .
  • the liquid crystal display includes a panel and a backlight module.
  • the backlight module is used to provide a light source to the panel.
  • the backlight module includes a switch circuit, an oscillator, a control unit, a first resistor and a second resistor. One end of the switch circuit is electrically connected to the first resistor, and the other end is electrically connected to the second resistor. When the switching circuit is turned on, the first resistor is connected in parallel with the second resistor.
  • the oscillator includes a frequency output, and the oscillator outputs different frequencies according to the equivalent resistance measured at the frequency output.
  • the frequency output is electrically connected to the first resistor and the switch circuit. When the switch circuit is turned off, the equivalent resistance measured at the frequency output is the resistance value of the first resistor, and the oscillator outputs a first frequency. When the switch circuit is turned on, the equivalent resistance measured at the frequency output terminal is a resistance value after the first resistor is connected in parallel with the second resistor, and the oscillator outputs a second frequency.
  • the control unit is electrically connected to the switch circuit, and outputs a control signal to control whether the switch circuit is turned on.
  • the first resistor and the second resistor have the same resistance value, indicating that when the switch circuit is turned on, the second frequency output by the oscillator is greater than the first frequency output by the oscillator when the switch circuit is turned off, and the second frequency It is twice the first frequency.
  • the oscillator outputs the first frequency
  • the oscillator outputs the second frequency.
  • the invention discloses the feature that the power of the backlight module is stabilized by the conversion of the first frequency and the second frequency, and the material can be selected with a cheaper material, so that the cost of manufacturing the liquid crystal display is low. Can be reduced.
  • FIG. 1 is a timing diagram of a power consumption of an oscillator and a backlight module when a liquid crystal display displays a planar image
  • FIG. 2 is a power consumption of an oscillator and a backlight module when a liquid crystal display displays a stereoscopic image
  • FIG. 3 is a circuit diagram of a backlight module according to a preferred embodiment of the present invention
  • FIG. 5 is a timing chart of the output frequency of the oscillator and the power consumption of the backlight module when the liquid crystal display of the present invention displays a stereoscopic image
  • FIG. 6 is a schematic illustration of a liquid crystal display in accordance with a preferred embodiment of the present invention. detailed description
  • FIG. 6 is a schematic diagram of a liquid crystal display according to a preferred embodiment of the present invention.
  • FIG. 3 is a schematic circuit diagram of a backlight module according to a preferred embodiment of the present invention.
  • the liquid crystal display 2 is configured to display any one of a planar image and a stereoscopic image.
  • the liquid crystal display 2 includes a panel 210 and a backlight module 220.
  • the backlight module 220 is configured to provide a light source to the panel 210.
  • the backlight module 220 includes a switch circuit 130, an oscillator 150, A control unit 110, a first resistor 160 and a second resistor 170.
  • the switch circuit 130 is electrically connected to the first resistor 160, and the other end is electrically connected to the second resistor 170.
  • the first resistor 160 is connected in parallel with the second resistor 170.
  • the oscillator 150 includes a frequency output 140 that outputs a different frequency based on the equivalent resistance measured at the frequency output 140.
  • the equivalent resistance measured by the frequency output terminal 140 is smaller, the output frequency of the oscillator 150 is larger. In other words, the greater the equivalent resistance measured by the frequency output terminal 140, the oscillator 150 is. The smaller the output frequency.
  • the frequency output terminal 140 is electrically connected to the first resistor 160 and the switch circuit 130.
  • the equivalent resistance measured by the frequency output terminal 140 is the resistance value of the first resistor 160, and the oscillator 150 outputs a first frequency.
  • the equivalent resistance measured by the frequency output terminal 140 is a resistance value after the first resistor 160 is connected in parallel with the second resistor 170, and the oscillator 150 outputs a second frequency.
  • the control unit 110 is electrically connected to the switch circuit 130 and outputs a control signal 120 to control whether the switch circuit 130 is turned on.
  • the first resistor 160 and the second resistor 170 have the same resistance value, indicating that when the switch circuit 130 is turned on, the second frequency output by the oscillator 150 is greater than when the switch circuit 130 is turned off, and the oscillator 150 is The first frequency is output, and the second frequency is twice the first frequency.
  • the oscillator 150 outputs a first frequency
  • the oscillator 150 outputs a second frequency.
  • FIG. 4 is a timing diagram of the output frequency of the oscillator and the power consumption of the backlight module when the liquid crystal display of the present invention is displayed, and FIG. 3 and FIG. 6 .
  • the control unit 110 outputs a control signal 120 to control the switch circuit 130 to be in an off state, and the equivalent resistance measured by the frequency output terminal 140 is a resistance value of the first resistor 160.
  • the oscillator 150 then outputs a first frequency.
  • the frequency of the power consumption of the backlight module 220 is also the first frequency, and the power of the backlight module 220 is W1.
  • FIG. 5 is a timing diagram of the output frequency of the oscillator and the power consumption of the backlight module when the liquid crystal display of the present invention displays a stereo image
  • FIG. 3 and FIG. 6 are a timing diagram of the output frequency of the oscillator and the power consumption of the backlight module when the liquid crystal display of the present invention displays a stereo image
  • the control unit 110 outputs a control signal 120 to control the switch circuit 130 to be in an on state.
  • the equivalent resistance measured by the frequency output terminal 140 is the first resistor 160 in parallel with the second resistor 170. After the resistance value.
  • the oscillator 150 then outputs a second frequency. Because the liquid crystal display 2 displays a stereo image, an image must sequentially display the right eye image and the left eye image, which reduces the frequency of the backlight module's power consumption. Therefore, the frequency of the backlight module 220's power consumption is the first. At a frequency, the power of the backlight module 220 is reduced by W1.
  • the power of the backlight module is maintained at W1, and the cheaper magnetic material can be selected, so that the cost can be reduced when manufacturing the liquid crystal display.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种在立体模式下改变震荡频率的背光模组及其液晶显示器,其中液晶显示器用以显示一平面影像或一立体影像其中的任一影像。液晶显示器(2)包括一面板(210)及一背光模组(220),其中背光模组(220)提供光源至面板(210)。背光模组(220)包括一开关电路(130)及振荡器(150)。开关电路(130)一端电性连接一第一电阻(160),另一端电性连接一第二电阻(170)。当开关电路(130)导通时,第一电阻(160)并联第二电阻(170)。振荡器(150)电性连接第一电阻(160)以及开关电路(130)。当液晶显示器(2)显示平面影像时,开关电路(130)截止,振荡器(150)输出一第一频率;当液晶显示器(2)显示立体影像时,开关电路(130)导通,振荡器(150)输出一第二频率;其中,第二频率为第一频率的两倍。借由第一频率和第二频率的转换,使背光模组消耗的功率保持稳定,可以降低液晶显示器的成本。

Description

在立体模式下改变震荡频率的背光模组及其液晶显示器
技术领域
本发明是有关于一种液晶显示器,特别是有关于一种在显示平面影像或立体影像其中 任一影像时, 有不同震荡频率的背光模组的液晶显示器。 背景技术
随着科技的进步与发达,人们对于物质生活以及精神层面的享受一向都只有增加而从 未减少, 以致于人们希望能够藉由显示装置来实现天马行空的想象力,并且达到身临其境 的效果。 因此, 如何使显示装置呈现立体的图像或影像, 便成为现今显示装置技术极欲达 到的目标。
图 1为前案一种液晶显示器在显示平面影像时振荡器和背光模组消粍功率时讯图。当 振荡器为高准位讯号时, 背光模组也为高准位, 表示背光模组提供一光源给面板, 这时背 光模组消粍的功率为 Wl。
图 2为前案一种液晶显示器在显示立体影像时振荡器和背光模组消粍功率时讯图。在 显示立体影像的时侯, 振荡器的频率和图 1中, 显示平面影像时振荡器的频率相同。 因为 液晶显示器在显示立体影像时,一个影像必须依序显示右眼画面和左眼画面, 因此会降低 背光模组的发光频率, 这时为了要保持画面的亮度, 背光模组会增加光源的功率, 所以背 光模组为高准位时, 表示背光模组提供一光源给液晶面板, 这时背光模组消粍的功率为 W2。假设消粍的功率与光源的亮度成正比,在立体影像中背光模组点亮光源时所消粍的功 率 W2为在显示平面影像中背光模组点亮光源时所消粍的功率 W1的两倍。
举例来说, 当液晶显示器显示平面影像, 且背光模组在提供光源给面板时, 背光模组 点亮光源的电流为 120毫安; 当液晶显示器显示立体影像,且背光模组在提供光源给面板 时,背光模组点亮光源的电流为 240毫安。在显示立体影像时的电流输出为显示平面影像 时的电流时的两倍, 此时的功率输出也是原来的两倍。在其它条件不变的情况下, 原本只 需要承受 120 毫安的磁性材料, 在显示立体影像时, 磁性材料的选择就变成了需要承受 240毫安。 此时的在磁性材料的选择上, 就需要选择可承 240毫安的材料, 就会造成材料 上的浪费及成本的提高。
因此需要一种在显示立体影像时,可降低背光模组点亮光源时所消粍的功率的液晶显 示器。 发明内容
为解决上述问题,本发明提出一种液晶显示器用以显示一平面影像或与一立体影像其 中的任一影像。 液晶显示器包括一面板以及一背光模组。 背光模组用以提供光源至面板。 其中背光模组包括一开关电路、一振荡器、 一控制单元、 一第一电阻以及一第二电阻。 开 关电路一端电性连接第一电阻, 另一端电性连接第二电阻。 当开关电路导通时, 第一电阻 并联第二电阻。 振荡器包括一频率输出端, 振荡器依据频率输出端所测量到的等效电阻, 输出不同的频率。 当频率输出端所测量到的等效电阻愈小, 振荡器的输出频率愈大, 换句 话说, 当频率输出端所测量到的等效电阻愈大, 振荡器的输出频率愈小。频率输出端电性 连接第一电阻以及开关电路。振荡器在当开关电路截止时,频率输出端所测量到的等效电 阻为第一电阻的电阻值, 振荡器则输出一第一频率。 当开关电路导通时, 频率输出端所测 量到的等效电阻为第一电阻并联第二电阻后的电阻值,振荡器输出一第二频率。控制单元 电性连接开关电路,并输出一控制讯号控制开关电路是否导通。其中第一电阻和第二电阻 有相同的电阻值, 表示当开关电路导通时, 振荡器所输出的第二频率, 大于开关电路截止 时, 振荡器所输出的第一频率, 且第二频率为第一频率的两倍。其中, 当液晶显示器显示 平面影像时, 振荡器输出第一频率, 以及当液晶显示器显示立体影像时, 振荡器输出第二 频率。
本发明揭露的特点在于,借由第一频率和第二频率的转换,使背光模组消粍的功率保 持稳定, 在材料的选择上就可以用较便宜的材料, 使制造液晶显示器时, 成本可以降低。 附图说明
图 1为前案一种液晶显示器在显示平面影像时振荡器和背光模组消粍功率时讯图; 图 2为前案一种液晶显示器在显示立体影像时振荡器和背光模组消粍功率时讯图; 图 3为本发明较佳实施例的背光模组的电路示意图;
图 4为本发明的液晶显示器在显示平面影像时, 振荡器输出频率与背光模组消粍功 率时序图;
图 5为本发明的液晶显示器在显示立体影像时, 振荡器输出频率与背光模组消粍功 率时序图;
图 6为本发明最佳实施例的液晶显示器的示意图。 具体实施方式
以下结合附图所示之最佳实施例作进一步详述。
请参阅图 6, 为本发明最佳实施例的液晶显示器的示意图。 并请同参阅图 3, 图 3为 本发明较佳实施例的背光模组的电路示意图。液晶显示器 2用以显示一平面影像与一立体 影像中的任一影像。该液晶显示器 2包括一面板 210以及一背光模组 220。该背光模组 220 用以提供光源至该面板 210。 其中该背光模组 220包括一开关电路 130、 一振荡器 150、 一控制单元 110、 一第一电阻 160以及一第二电阻 170。 该开关电路 130—端电性连接第 一电阻 160, 另一端电性连接第二电阻 170。 当该开关电路 130导通时, 该第一电阻 160 并联该第二电阻 170。 该振荡器 150包括一频率输出端 140, 该振荡器 150依据该频率输 出端 140所测量到的等效电阻,输出不同的频率。当该频率输出端 140所测量到的等效电 阻愈小, 该振荡器 150的输出频率愈大, 换句话说, 当该频率输出端 140所测量到的等效 电阻愈大, 该振荡器 150的输出频率愈小。 该频率输出端 140 电性连接该第一电阻 160 以及该开关电路 130。 该振荡器 150在当该开关电路 130截止时, 该频率输出端 140所测 量到的等效电阻为第一电阻 160的电阻值,该振荡器 150则输出一第一频率。当该开关电 路导通时,该频率输出端 140所测量到的等效电阻为第一电阻 160并联第二电阻 170后的 电阻值, 该振荡器 150输出一第二频率。 该控制单元 110电性连接该开关电路 130, 并输 出一控制讯号 120控制该开关电路 130是否导通。其中该第一电阻 160和该第二电阻 170 有相同的电阻值, 表示当该开关电路 130导通时, 振荡器 150所输出的第二频率, 大于该 开关电路 130截止时, 振荡器 150所输出的第一频率, 且第二频率为第一频率的两倍。其 中当液晶显示器 2显示平面影像时,振荡器 150输出第一频率, 以及当液晶显示器 2显示 立体影像时, 振荡器 150输出第二频率。
请参阅图 4, 为本发明的液晶显示器在显示平面影像时, 振荡器输出频率与背光模组 消粍功率时序图, 同时请参阅图 3及图 6。 在该液晶显示器 2显示平面影像时, 该控制单 元 110输出一控制讯号 120控制该开关电路 130为截止状态,该频率输出端 140所测量到 的等效电阻为第一电阻 160的电阻值。该振荡器 150则输出第一频率。背光模组 220的消 粍功率的频率也为第一频率, 这时背光模组 220消粍的功率为 Wl。
请参阅图 5, 为本发明的液晶显示器在显示立体影像时, 振荡器输出频率与背光模组 消粍功率时序图, 同时请参阅图 3及图 6。 该液晶显示器 2显示立体影像时, 该控制单元 110输出一控制讯号 120控制该开关电路 130为导通状态,该频率输出端 140所测量到的 等效电阻为第一电阻 160并联第二电阻 170后的电阻值。 该振荡器 150则输出第二频率。 因为液晶显示器 2在显示立体影像时,一个影像必须依序显示右眼画面和左眼画面,就会 降低背光模组的消粍功率的频率, 因此背光模组 220的消粍功率的频率为第一频率,让时 背光模组 220消粍的功率为 Wl。
上述的液晶显示器,藉由第一频率和第二频率的转换,使背光模组消粍的功率保持为 W1 , 就可以选择用较便宜的磁性材料, 使制造液晶显示器时, 成本可以降低。
以上, 仅为本发明之较佳实施例, 意在进一步说明本发明, 而非对其进行限定。 凡根 据上述之文字和附图所公开的内容进行的简单的替换, 都在本专利的权利保护范围之列。

Claims

权利要求
、 一种液晶显示器, 用以显示一平面影像或一立体影像其中的任一影像, 包括:
一面板; 以及
一背光模组, 用以提供光源至该面板, 该背光模组包括:
一开关电路,该开关电路一端电性连接一第一电阻,另一端电性连接一第二电 阻, 当该开关电路导通时, 该第一电阻并联该第二电阻;
一振荡器, 电性连接该第一电阻以及该开关电路, 当该开关电路截止时, 该振 荡器输出一第一频率, 当该开关电路导通时, 该振荡器输出一第二频率; 以及 一控制单元, 该控制单元电性连接该开关电路, 并控制该开关电路是否导通; 其中, 当该液晶显示器显示该平面影像时, 该振荡器输出该第一频率, 以及当该 液晶显示器显示该立体影像时, 该振荡器输出该第二频率, 该液晶显示器显示该平面 影像时, 该控制单元控制该开关电路为截止状态, 以及该液晶显示器显示该立体影像 时,该控制单元控制该开关电路为导通状态,所述的该液晶显示器显示该平面影像时, 该振荡器输出该第一频率, 该液晶显示器显示该立体影像时, 该振荡器输出该第二频 率, 该第二频率为该第一频率的两倍。
、 一种液晶显示器, 用以显示一平面影像或一立体影像其中的任一影像, 包括:
一面板; 以及
一背光模组, 用以提供光源至该面板, 该背光模组包括:
一开关电路, 该开关电路一端电性连接一第一电阻, 另一端电性连接一第二电阻, 当该开关电路导通时, 该第一电阻并联该第二电阻; 以及
一振荡器, 电性连接该第一电阻以及该开关电路, 当该开关电路截止时, 该振荡 器输出一第一频率, 当该开关电路导通时, 该振荡器输出一第二频率;
其中, 当该液晶显示器显示该平面影像时, 该振荡器输出该第一频率, 以及当该 液晶显示器显示该立体影像时, 该振荡器输出该第二频率。
、 如权利要求 2所述的液晶显示器, 其中, 所述的该第二频率大于该第一频率。
、 如权利要求 3所述的液晶显示器, 其中, 所述的该背光模组还包括一控制单元, 该控 制单元电性连接该开关电路, 并控制该开关电路是否导通。
、 如权利要求 4所述的液晶显示器, 其中, 所述的该液晶显示器显示该平面影像时, 该 控制单元控制该开关电路为截止状态, 以及该液晶显示器显示该立体影像时, 该控制 单元控制该开关电路为导通状态。
、 如权利要求 5所述的液晶显示器, 其中, 所述的该液晶显示器显示该平面影像时, 该 振荡器输出该第一频率,该液晶显示器显示该立体影像时,该振荡器输出该第二频率。 、 如权利要求 2所述的液晶显示器, 其中, 所述的该第二频率为该第一频率的两倍。 、 一种背光模组, 用以提供光源至一面板, 该背光模组包括:
一开关电路, 该开关电路一端电性连接一第一电阻, 另一端电性连接一第二电阻, 当该开关导通时, 该第一电阻并联该第二电阻; 以及
一振荡器, 电性连接该第一电阻以及该开关电路, 当该开关电路截止时, 该振荡 器输出一第一频率, 当该开关电路导通时, 该振荡器输出一第二频率。
、 如权利要求 8所述的液晶显示器, 其中, 所述的该第二频率大于该第一频率。
0、如权利要求 8所述的液晶显示器, 其中, 所述的该背光模组还包括一控制单元, 该控 制单元电性连接该开关电路, 并控制该开关电路是否导通。
1、 如权利要求 8所述的液晶显示器, 其中, 所述的该第二频率为该第一频率的两倍。
PCT/CN2012/077686 2012-05-09 2012-06-28 在立体模式下改变震荡频率的背光模组及其液晶显示器 WO2013166768A1 (zh)

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