WO2014012303A1 - 扫描背光方法、扫描背光装置及液晶显示装置 - Google Patents

扫描背光方法、扫描背光装置及液晶显示装置 Download PDF

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Publication number
WO2014012303A1
WO2014012303A1 PCT/CN2012/083034 CN2012083034W WO2014012303A1 WO 2014012303 A1 WO2014012303 A1 WO 2014012303A1 CN 2012083034 W CN2012083034 W CN 2012083034W WO 2014012303 A1 WO2014012303 A1 WO 2014012303A1
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WIPO (PCT)
Prior art keywords
liquid crystal
backlight
guide element
light guide
light
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Ceased
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PCT/CN2012/083034
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English (en)
French (fr)
Inventor
张丽蕾
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to US13/996,113 priority Critical patent/US10431163B2/en
Publication of WO2014012303A1 publication Critical patent/WO2014012303A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G02F1/133601—Illuminating devices for spatial active dimming
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen

Definitions

  • the invention relates to a scanning backlight method, a scanning backlight device and a liquid crystal display device. Background technique
  • the scanning backlight technology divides the liquid crystal display into a plurality of regions according to a horizontal area; in any region, selects to turn on or off the backlight (for example, LED backlight) at an appropriate position of the liquid crystal response curve, when the liquid crystal response curve is in a slow rising or falling phase ( In the tailing phase, the backlight is turned off, so the backlight is turned on during the smooth phase of the liquid crystal response curve.
  • Scanning backlight technology improves picture sharpness, reduces smearing and improves contrast.
  • the edge-lit scanning backlight technology has become a research hotspot.
  • the backlight module in which the light bar is horizontally controlled on the left and right sides of the display panel is easier to apply the scanning backlight technology, and the light bar on the upper and lower sides of the display panel is vertical.
  • Controlled backlight modules face more difficulties when applied.
  • the backlight module with the light bars on the upper and lower sides is more prominent than the backlight module with the left and right light bars.
  • Good heat dissipation conditions result in a long service life. Therefore, how to apply scanning backlight technology on a backlight module with light bars on the upper and lower sides becomes an urgent problem to be solved. Summary of the invention
  • Embodiments of the present invention provide a scanning backlight method, a scanning backlight device, and a liquid crystal display device, which can realize a scanning backlight based on a side-illuminated backlight while ensuring the sharpness of the scanning backlight.
  • An aspect of the present invention provides a scanning backlight method for a backlight, wherein the backlight is a side-illuminated backlight, including a light source and a light guiding element, and the light source is disposed on upper and lower sides of the light guiding element.
  • the light guiding element comprises two optical regions juxtaposed to each other on the upper side and the lower side, and the method comprises:
  • the light guiding element forms two optical regions juxtaposed to each other on the upper side and the lower side: a seam is provided at a horizontal position in the middle of the light guiding element.
  • the two bonding surfaces of the light guiding elements that are in contact with the seam are reflective surfaces.
  • the response period of the pixel liquid crystal and the refresh rate of the liquid crystal display are reciprocal to each other.
  • a scanning backlight device including a driving circuit, a side-illuminated backlight, and a backlight control circuit.
  • the side-illuminated backlight includes two optical regions on the upper side and the lower side, respectively.
  • the backlight control circuit configured to stabilize the liquid crystal response of the last row of pixels corresponding to the upper and lower optical regions, and corresponding to a first row of pixel liquid crystals of the upper and lower optical regions are respectively started to transmit a control signal to the driving circuit at a start of a next response period;
  • the driving circuit is configured to correspond to the upper and lower sides according to the received
  • the last row of the pixel region of the optical region responds to the control signal sent after the stabilization, and the light source of the upper and lower sides is turned on; according to the received response period of the first row of pixel liquid crystals corresponding to the upper and lower optical regions
  • the control signal sent at the beginning turns off the light sources on the upper and lower sides.
  • the side-illuminated backlight includes a light guiding element, and the light guiding element is provided with a seam at a horizontal position therebetween, and the seam divides the light guiding element into two optical regions of an upper side and a lower side. .
  • the two bonding surfaces of the light guiding elements that are in contact with the seam are reflective surfaces.
  • the response period of the pixel liquid crystal and the refresh rate of the liquid crystal display are reciprocal to each other.
  • the light source is a point source or a line source.
  • Still another aspect of the present invention provides a liquid crystal display device including the above-described scanning backlight device.
  • the scanning backlight method, the scanning backlight device and the liquid crystal display device of the embodiment of the invention solve the technical problem that the scanning backlight cannot be applied to the side-illuminated backlight provided on the upper and lower sides of the light source without affecting the definition of the scanning backlight. Expanded the range of applications for scanning backlights. DRAWINGS
  • FIG. 1 is a schematic structural view of a backlight based on a side illumination type according to the present invention
  • FIG. 2 is a schematic diagram showing the operation of the method of scanning backlight according to the present invention.
  • the side-illuminated backlight comprises a light source and a light guiding element, the light sources are respectively disposed on upper and lower sides of the light guiding element, and the light guiding element comprises two optical regions of an upper side and a lower side.
  • the backlight is used in a liquid crystal display device, and a display area of a liquid crystal panel of the liquid crystal display device includes a plurality of rows of pixels.
  • the scanning backlight method used by the backlight after the liquid crystal response of the last row corresponding to the upper and lower optical regions is stabilized, turns on the light sources located on the upper and lower sides; in the first row of pixels corresponding to the upper and lower optical regions When the next response period of the liquid crystal starts, the light sources located on the upper and lower sides are turned off.
  • Fig. 1 shows the structure of a side-illuminated backlight in an embodiment of the present invention.
  • the left side of Fig. 1 is a plan view of the backlight, and the right side is a longitudinal cross-sectional view of the backlight.
  • the side-illuminated backlight comprises a light strip board 11 on the upper and lower sides, and a plurality of light-emitting diode (LED) light sets 12 disposed on the light strip board 11.
  • LED light-emitting diode
  • the backlight is from above
  • the surface to the lower surface are, in order, the upper frame 13, the film 14, the spliced light guide 15, the bottom reflection sheet 16, and the back plate 17.
  • These LED lamp groups 12 as light sources are disposed, for example, in the longitudinal direction of the light bar plate 11 in a direction opposite to the side surface of the light guide plate 15.
  • the spliced light guide plates 15 are spliced together by the seams 18 located at the intermediate horizontal position, and due to the action of the slats 18, the lights of the LED groups of the upper and lower sides are not mixed with each other.
  • the side-illuminated backlight is divided into two optical regions, an upper side and a lower side, by providing a seam 18 at a horizontal position in the middle of the light guiding element (here, the light guiding plate 15).
  • the optical area of the light guiding element generally corresponds to the display area of the liquid crystal panel, and the upper side and lower side optical areas respectively correspond to the upper side portion and the lower side portion of the display area of the liquid crystal panel.
  • the scanning backlight method of the present embodiment is used in the above-mentioned side-illuminated backlight, and includes the following steps: Step 201: After the liquid crystal response of the last row corresponding to the upper and lower optical regions is stabilized, the upper and lower sides are opened. LED light group;
  • Step 202 Turn off the LED groups on the upper and lower sides when the first response period of the first row of pixel liquid crystals corresponding to the upper and lower optical regions starts.
  • FIG. 2 is a schematic view showing the operation of the backlight scanning method of the embodiment of the present invention.
  • the horizontal axis represents time
  • the vertical axis represents each row of pixels of the display area of the liquid crystal panel, for example, the first row to the Nth row of pixels
  • the grid in FIG. 2 is the response time of the pixel liquid crystal
  • the shaded portion is the LED light group. Opening time.
  • the LED lamp group located on the upper side light bar panel is turned on; similarly, when the last row of pixels corresponding to the lower optical region is liquid crystal response After stabilization, turn on the LED light group located on the lower light strip.
  • the response period of the pixel liquid crystal and the refresh rate of the liquid crystal display are reciprocal to each other.
  • the response time of the liquid crystal is the speed at which each pixel of the liquid crystal display device reacts to the input signal, that is, the time required for the pixel to be turned from dark to bright or from bright to dark, during which time liquid crystal molecules are applied by applying a voltage in the liquid crystal cell. Torsion and recovery, which in turn causes a change in brightness and darkness. Therefore, generally like
  • the response time of the liquid crystal is one of the attribute parameters of the liquid crystal display device.
  • the backlight control circuit can calculate the time required for the liquid crystal response of the pixel corresponding to the upper and lower optical regions to be stable according to the area of the backlight and the size of the display area of the entire liquid crystal panel.
  • the light source used is a line source such as a cold cathode fluorescent lamp (CCFL), rather than a point source such as an LED.
  • CCFL cold cathode fluorescent lamp
  • another embodiment of the present invention further provides a scanning backlight device, including a driving circuit, a side-illuminated backlight, and a backlight control circuit.
  • the light guiding element of the side-illuminated backlight comprises two upper and lower optical regions, the light source is disposed on the upper and lower sides of the light guiding element; and the backlight control circuit is configured to correspond to the upper and lower sides.
  • the backlight control circuit respectively sends the control signals according to the received stable liquid crystal response corresponding to the last row of the upper and lower optical regions, and respectively turns on the upper and lower LED light groups; according to the received The upper and lower LED light groups are respectively turned off at control signals transmitted at the beginning of a response period corresponding to the first row of pixel liquid crystals of the upper and lower optical regions.
  • the timing controller of the liquid crystal display device applying the scanning backlight device sends a clock signal to the backlight control circuit, and the backlight control circuit receives the clock. After the signal, the time required for all the pixel liquid crystals of the upper region to be stable is calculated. After delaying the required time period, a control signal is sent to the driving circuit, and the driving circuit is controlled to be turned on.
  • the timing controller of the backlight sends a clock signal to the backlight control circuit again, and the backlight control circuit determines the received clock
  • a control signal is sent to the driving circuit, and the driving circuit controls to turn off the LED lamp group located on the upper side light bar.
  • the light source used is a line source such as a cold cathode fluorescent lamp (CCFL) instead of a point source such as an LED.
  • CCFL cold cathode fluorescent lamp
  • the side-illuminated backlight is divided into two optical regions, an upper side and a lower side, by a seam provided at a horizontal position in the middle of the light guiding element.
  • the two joint faces at the seam can be reversed
  • the surface is surfaced to better prevent light mixing;
  • the joint surface of the seam may be a curved surface in addition to a plane, as long as the two joint surfaces at the seam are closely attached.
  • the response period of the pixel liquid crystal and the refresh rate of the liquid crystal display are reciprocal to each other.
  • Another embodiment of the present invention also provides a liquid crystal display device.
  • the liquid crystal display device includes a liquid crystal panel and a scanning backlight device as described above.
  • the scanning backlight device is disposed behind the liquid crystal panel to provide a light source for the liquid crystal panel display; and, the optical area of the light guiding element of the scanning backlight device or the display area i of the liquid crystal panel.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Planar Illumination Modules (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种扫描背光方法及装置，所述方法包括：将侧面照射式的背光源分为上侧、下侧两个光学区域；在对应于上、下侧光学区域的最后一行像素液晶响应稳定后，开启位于上、下侧的光源；在对应于上、下侧光学区域的第一行像素液晶下一个响应周期开始时，关闭位于上、下侧的光源。通过分别控制位于上、下侧的光源的开启和关闭时间，解决了扫描背光在侧面照射式的背光源的难题，扩大了扫描背光的应用范围。

Description

扫描背光方法、 扫描背光装置及液晶显示装置 技术领域
本发明涉及一种扫描背光方法、 扫描背光装置及液晶显示装置。 背景技术
扫描背光技术是将液晶显示器按照水平区域分割成多个区域； 在任意区 域内， 选择在液晶响应曲线适当的位置打开或关闭背光（例如 LED背光） ， 当液晶响应曲线处于緩慢上升或下降阶段（拖尾阶段）就关闭背光源， 因此 在液晶响应曲线平稳阶段打开背光源。扫描背光技术可以提升画面的清晰度， 减轻拖尾， 提高对比度。 为了使背光源在应用扫描背光技术的同时， 又能保 证轻薄的特点， 釆用侧光式的扫描背光技术成为研究的热点。
由于液晶像素响应是按照行响应的方式进行的， 所以在显示面板左右两 侧设置灯条进行水平控制的背光源模块在应用扫描背光技术时较容易， 而在 显示面板上下两侧灯条进行垂直控制的背光源模块在应用时则会面临较多的 困难。 但是， 具有上下两侧灯条的背光源模块， 相比具有左右两侧灯条的背 光源模块散热优势更为突出。 良好的散热条件会带来较长的使用寿命。 因此， 如何在具有上下两侧灯条的背光源模块上应用扫描背光技术， 成为一个急需 解决的问题。 发明内容
本发明的实施例提供了一种扫描背光方法、 扫描背光装置及液晶显示装 置， 在保证扫描背光清晰度的前提下， 能够实现基于侧面照射式背光源的扫 描背光。
本发明的一个方面提供了一种用于背光源的扫描背光方法， 所述背光源 为侧面照射式背光源， 包括光源和导光元件， 所述光源设置在导光元件的上 下两侧， 所述导光元件包括上侧、 下侧两个彼此并列的光学区域， 所述方法 包括：
在对应于所述上、 下侧光学区域的最后一行像素液晶响应稳定后， 分别 开启位于上、 下侧的光源；
在对应于所述上、 下侧光学区域的第一行像素液晶下一个响应周期开始 时， 分别关闭位于上、 下侧的光源。
例如， 所述导光元件形成上侧、 下侧两个彼此并列的光学区域为： 在所 述导光元件中间水平位置设置拼缝。
例如， 所述导光元件在所述拼缝相接的两个接合面为反射面。
例如， 所述像素液晶的响应周期与液晶显示的刷新频率互为倒数。
本发明的另一个方面提供了一种扫描背光装置， 包括驱动电路、 侧面照 射式背光源、 背光源控制电路； 其中， 所述侧面照射式背光源包括上侧、 下 侧两个光学区域和分别对应于所述上、 下侧光学区域的上、 下侧光源； 所述 背光源控制电路， 用于在对应于所述上、 下侧光学区域的最后一行像素液晶 响应稳定后以及在对应于所述上、 下侧光学区域的第一行像素液晶下一个响 应周期开始时， 分别发送控制信号给所述驱动电路； 所述驱动电路， 用于根 据接收到的在对应于所述上、 下侧光学区域的最后一行像素液晶响应稳定后 发送的控制信号， 开启所述上、 下侧的光源； 根据接收到的在对应于所述上、 下侧光学区域的第一行像素液晶下一个响应周期开始时发送的控制信号， 关 闭所述上、 下侧的光源。
例如， 所述侧面照射式背光源包括导光元件， 所述导光元件在其中间水 平位置设置有拼缝，所述拼缝将所述导光元件分为上侧、下侧两个光学区域。
例如， 所述导光元件在所述拼缝相接的两个接合面为反射面。
例如， 所述像素液晶的响应周期与液晶显示的刷新频率互为倒数。
例如， 所述光源为点光源或线光源。
本发明的再一个方面提供了一种液晶显示装置，包含上述扫描背光装置。 本发明实施例的扫描背光方法、 扫描背光装置及液晶显示装置， 在不影 响扫描背光清晰度的前提下， 解决了扫描背光不能应用在光源设置在上下侧 的侧面照射式背光源的技术问题， 扩大了扫描背光的应用范围。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为本发明基于侧面照射式的背光源的结构示意图；
图 2为本发明扫描背光方法的工作原理图。
附图标记
11-位于上下两侧的灯条板； 12-LED灯组； 13-上框架； 14-膜材； 15-拼 接式导光板； 16-底反射片； 17-背板； 18-拼缝。 具体实施方式
为使本公开实施例的目的、 技术方案和优点更加清楚， 下面将结合本公 开实施例的附图，对本公开实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本公开的一部分实施例， 而不是全部的实施例。 基于所描 述的本公开的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本公开保护的范围。
在本公开之中， 除非另作定义， 此处使用的技术术语或者科学术语应当 为本发明所属领域内具有一般技能的人士所理解的通常意义。 本发明专利申 请说明书以及权利要求书中使用的 "第一" "第二" 以及类似的词语并不表 示任何顺序、数量或者重要性， 而只是用来区分不同的组成部分。 同样， "一 个"或者 "一"等类似词语也不表示数量限制，而是表示存在至少一个。 "上"、 "下" 、 "左" 、 "右" 等仅仅表示如附图所示情形的相对位置关系， 随着 装置的位置的改变， 这些相对位置关系也会相应地改变。
本发明的实施例中， 侧面照射式的背光源包括光源和导光元件， 光源分 别设置于导光元件的上下两侧， 导光元件包括上侧、 下侧两个光学区域。 该 背光源用于液晶显示装置， 该液晶显示装置的液晶面板的显示区域包括多行 像素。 该背光源使用的扫描背光方法， 在对应于上、 下侧光学区域的最后一 行像素液晶响应稳定后， 开启位于上、 下侧的光源； 在对应于上、 下侧光学 区域的第一行像素液晶下一个响应周期开始时， 关闭位于上、 下侧的光源。
图 1示出了本发明实施例中侧面照射式背光源的结构。 图 1中左侧为所 述背光源的俯视图， 右侧为所述背光源的纵向剖视图。
该侧面照射式背光源包括位于上下两侧的灯条板 11、设置于所述灯条板 11上的若干个发光二极管（ LED )灯组 12。 结合纵向剖视图， 该背光源从上 表面至下表面依次为上框架 13、 膜材 14、 拼接式导光板 15、 底反射片 16、 背板 17。 这些作为光源的 LED灯组 12例如依次沿着灯条板 11的长度方向 设置， 与导光板 15的侧面相对。 拼接式导光板 15通过位于中间水平位置的 拼缝 18拼接在一起，且由于所述拼缝 18的作用，使上下两侧的 LED灯组的 光不会彼此混合。 由此， 所述侧面照射式的背光源通过在导光元件（这里即 导光板 15 ) 中间水平位置设置拼缝 18, 将其分为上侧、 下侧两个光学区域。 导光元件的光学区域总地对应于液晶面板的显示区域， 而上侧、 下侧光学区 域则分别对应于液晶面板的显示区域的上侧部分和下侧部分。
本实施例的扫描背光方法，用于上述侧面照射式背光源， 包括下述步骤： 步骤 201 , 在对应于上、 下侧光学区域的最后一行像素液晶响应稳定后， 开启位于上、 下侧的 LED灯组；
步骤 202, 在对应于上、 下侧光学区域的第一行像素液晶下一个响应周 期开始时， 关闭位于上、 下侧的 LED灯组。
图 2示出了图 1所述背光源应用本发明实施例的背光扫描方法的工作原 理图。 图 2中横轴代表时间， 纵轴代表液晶面板的显示区域的各行像素， 例 如第 1行至第 N行像素； 此外， 图 2中网格为像素液晶的响应时间， 阴影部 分为 LED灯组的开启时间。如图 2所示， 当对应于上侧光学区域的最后一行 像素液晶响应稳定后， 开启位于上侧灯条板的 LED灯组； 同理， 当对应于下 侧光学区域的最后一行像素液晶响应稳定后，开启位于下侧灯条板的 LED灯 组。
图 2所示， 当对应于上侧光学区域中的第一行像素液晶的下一个响应周 期开始时，上侧的阴影部分结束，即关闭位于上侧灯条板的 LED灯组； 同时， 对应于上侧光学区域的像素液晶进入响应阶段。
当对应于下侧光学区域中的第一行像素液晶的下一个响应周期开始时， 如图 2中所示， 下侧的阴影部分结束， 即关闭位于下侧灯条板的 LED灯组； 同时， 对应于下侧光学区域的像素液晶进入响应阶段。
这里， 所述像素液晶的响应周期与液晶显示的刷新频率互为倒数。
液晶的响应时间是液晶显示装置各像素点对输入信号反应的速度， 即： 像素点由暗转亮或由亮转暗所需要的时间， 这段时间内通过在液晶盒内施加 电压使液晶分子扭转与恢复， 进而使像素点发生明暗的变化。 因此， 一般像 素液晶的响应时间是液晶显示装置的属性参数之一。 背光源控制电路可以根 据背光源所划分区域以及整个液晶面板的显示区域的尺寸， 计算得到对应于 上、 下侧光学区域的像素液晶响应稳定所需的时间。
在另一个实施例的背光源中， 所使用的光源是例如冷阴极荧光灯 ( CCFL ) 的线光源， 而不是例如 LED的点光源。
为实现上述方法， 本发明的另一个实施例还提供了一种扫描背光装置， 包括驱动电路、 侧面照射式背光源、 背光源控制电路。 所述侧面照射式背光 源的导光元件包括上侧、 下侧两个光学区域， 光源设置在导光元件的上、 下 侧； 所述背光源控制电路， 用于在对应于上、 下侧光学区域的最后一行像素 液晶响应稳定后、 以及在对应于上、 下侧光学区域的第一行像素液晶下一个 响应周期开始时， 发送控制信号给驱动电路； 所述驱动电路， 用于根据接收 到的控制信号， 开启或关闭所述上、 下侧的 LED灯组。
例如， 所述背光源控制电路根据接收到的在对应于上、 下侧光学区域的 最后一行像素液晶响应稳定后发送控制信号， 分别开启所述上、 下侧的 LED 灯组； 根据接收到的在对应于上、 下侧光学区域的第一行像素液晶下一个响 应周期开始时发送的控制信号， 分别关闭所述上、 下侧的 LED灯组。
更详细地， 所述上侧区域的像素液晶开始响应时， 应用该扫描背光装置 的液晶显示装置的时序控制器会发送一个时钟信号给所述背光源控制电路， 背光源控制电路接收到该时钟信号后， 计算得到上侧区域的像素液晶全部响 应稳定所需的时间， 在延迟所述所需的时间的时长后， 再发送控制信号给所 述驱动电路， 由所述驱动电路控制开启位于上侧灯条板的 LED灯组； 当上侧 区域的像素液晶再次开始响应时， 背光源的时序控制器再次发送一个时钟信 号给所述背光源控制电路， 该背光源控制电路判断接收到的时钟信号与上一 个时钟信号相差为一个响应周期时， 则发送控制信号给所述驱动电路， 由所 述驱动电路控制关闭位于上侧灯条的 LED灯组。 位于下侧灯条板的 LED灯 组的开启关闭的实现过程与上述相同， 这里不再赘述。
同样， 在另一个实施例的扫描背光装置中， 所使用的光源是例如冷阴极 荧光灯（CCFL ) 的线光源， 而不是例如 LED的点光源。
这里， 所述侧面照射式的背光源通过在导光元件中间水平位置设置的拼 缝， 分为上侧、 下侧两个光学区域。 例如， 该拼缝处的两个接合面可以为反 射面， 从而更好地防止光混合； 该拼缝的接合面除了为平面之外， 还可以为 曲面， 只要该拼缝处的两个接合面紧密相贴即可。
这里， 所述像素液晶的响应周期与液晶显示的刷新频率互为倒数。 本发明的另一个实施例还提供了一种液晶显示装置。 该液晶显示装置包 含液晶面板和如上所述的扫描背光装置。 该扫描背光装置设置在液晶面板之 后， 为液晶面板显示提供光源； 而且， 该扫描背光装置的导光元件的光学区 或对应于液晶面板的显示区 i或。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种用于背光源的扫描背光方法， 所述背光源为侧面照射式背光源， 包括光源和导光元件， 所述光源设置在导光元件的上下两侧， 所述导光元件 包括上侧、 下侧两个彼此并列的光学区域， 所述方法包括：
在对应于所述上、 下侧光学区域的最后一行像素液晶响应稳定后， 分别 开启位于上、 下侧的光源；
在对应于所述上、 下侧光学区域的第一行像素液晶下一个响应周期开始 时， 分别关闭位于上、 下侧的光源。
2、根据权利要求 1所述的方法， 其中所述导光元件形成上侧、 下侧两个 彼此并列的光学区域为： 在所述导光元件中间水平位置设置拼缝。
3、根据权利要求 2所述的方法，其中所述导光元件在所述拼缝相接的两 个接合面为反射面。
4、根据权利要求 1-3任一所述的方法， 其中所述像素液晶的响应周期与 液晶显示的刷新频率互为倒数。
5、 一种扫描背光装置， 包括驱动电路、 侧面照射式背光源、 背光源控制 电路； 其中，
所述侧面照射式背光源包括上侧、 下侧两个光学区域和分别对应于所述 上、 下侧光学区域的上、 下侧光源；
所述背光源控制电路， 用于在对应于所述上、 下侧光学区域的最后一行 像素液晶响应稳定后以及在对应于所述上、 下侧光学区域的第一行像素液晶 下一个响应周期开始时， 分别发送控制信号给所述驱动电路；
所述驱动电路， 用于根据接收到的在对应于所述上、 下侧光学区域的最 后一行像素液晶响应稳定后发送的控制信号， 开启所述上、 下侧光源； 根据 接收到的在对应于所述上、 下侧光学区域的第一行像素液晶下一个响应周期 开始时发送的控制信号， 关闭所述上、 下侧的光源。
6、根据权利要求 5所述的扫描背光装置，其中所述侧面照射式背光源包 括导光元件， 所述导光元件在其中间水平位置设置有拼缝， 所述拼缝将所述 导光元件分为上侧、 下侧两个光学区域。
7、根据权利要求 6所述的扫描背光装置，其中所述导光元件在所述拼缝 相接的两个接合面为反射面。
8、根据权利要求 5-7任一所述的扫描背光装置， 其中所述像素液晶的响 应周期与液晶显示的刷新频率互为倒数。
9、根据权利要求 5所述的扫描背光装置，其中所述光源为点光源或线光 源。
10、 一种液晶显示装置， 包含如权利要求 5至 9任一项所述的扫描背光 装置。
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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109741712A (zh) * 2019-03-27 2019-05-10 京东方科技集团股份有限公司 背光驱动方法及装置、显示装置
CN112397032B (zh) * 2019-08-19 2022-06-07 Tcl科技集团股份有限公司 一种动态背光驱动模组、方法及显示驱动模组
CN113362776A (zh) * 2021-06-30 2021-09-07 北京京东方光电科技有限公司 一种场序显示装置、控制方法及显示设备
US20240078980A1 (en) * 2022-09-02 2024-03-07 Htc Corporation Display device and control method thereof
CN117746801A (zh) * 2022-09-13 2024-03-22 宏达国际电子股份有限公司 显示设备及其控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200426770A (en) * 2003-03-18 2004-12-01 Lumileds Lighting Llc Backlight, liquid crystal apparatus comprising such a backlight, and method of operating such an apparatus
CN101063773A (zh) * 2006-04-27 2007-10-31 奇景光电股份有限公司 改善动态影像品质之侧光式背光模块机构及方法
CN101901585A (zh) * 2010-08-20 2010-12-01 青岛海信电器股份有限公司 一种实现液晶显示器背光动态扫描的方法及设备
US20110090263A1 (en) * 2009-10-19 2011-04-21 Samsung Electronics Co., Ltd. Backlight unit, display apparatus including the same and control method thereof
CN102160386A (zh) * 2008-09-17 2011-08-17 三星电子株式会社 显示立体图像的方法和设备

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070052470A (ko) * 2005-11-17 2007-05-22 삼성전자주식회사 액정 표시 장치 및 액정 표시 장치의 구동 방법
KR20100097515A (ko) * 2009-02-26 2010-09-03 엘지디스플레이 주식회사 액정표시장치용 백라이트 유닛
JP5671032B2 (ja) * 2009-09-04 2015-02-18 サムスン エレクトロニクス カンパニー リミテッド エッジ型バックライトユニットを備えるｌｃｄ装置及びその制御方法
CN102472444A (zh) * 2009-10-20 2012-05-23 夏普株式会社 背光源装置、具备它的图像显示装置及驱动方法
KR101325314B1 (ko) * 2009-12-11 2013-11-08 엘지디스플레이 주식회사 액정표시장치
KR101366964B1 (ko) * 2009-12-30 2014-02-24 엘지디스플레이 주식회사 액정표시장치
US20120293717A1 (en) * 2010-01-12 2012-11-22 Sharp Kabushiki Kaisha Display device and television receiver
JP5825895B2 (ja) * 2010-08-06 2015-12-02 株式会社半導体エネルギー研究所 液晶表示装置
US20120075883A1 (en) * 2010-09-28 2012-03-29 Kocam International Co., Ltd. Edge-type led backlight moudle
TWI418899B (zh) * 2010-10-12 2013-12-11 Au Optronics Corp 液晶顯示器及其背光模組
CN202057827U (zh) * 2011-05-26 2011-11-30 京东方科技集团股份有限公司 导光板及背光模组

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200426770A (en) * 2003-03-18 2004-12-01 Lumileds Lighting Llc Backlight, liquid crystal apparatus comprising such a backlight, and method of operating such an apparatus
CN101063773A (zh) * 2006-04-27 2007-10-31 奇景光电股份有限公司 改善动态影像品质之侧光式背光模块机构及方法
CN102160386A (zh) * 2008-09-17 2011-08-17 三星电子株式会社 显示立体图像的方法和设备
US20110090263A1 (en) * 2009-10-19 2011-04-21 Samsung Electronics Co., Ltd. Backlight unit, display apparatus including the same and control method thereof
CN101901585A (zh) * 2010-08-20 2010-12-01 青岛海信电器股份有限公司 一种实现液晶显示器背光动态扫描的方法及设备

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