WO2017177732A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2017177732A1
WO2017177732A1 PCT/CN2017/070440 CN2017070440W WO2017177732A1 WO 2017177732 A1 WO2017177732 A1 WO 2017177732A1 CN 2017070440 W CN2017070440 W CN 2017070440W WO 2017177732 A1 WO2017177732 A1 WO 2017177732A1
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Prior art keywords
light
guide plate
light guide
backlight module
light source
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PCT/CN2017/070440
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English (en)
French (fr)
Inventor
刘晴
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京东方科技集团股份有限公司
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Priority to US15/541,903 priority Critical patent/US9977283B2/en
Publication of WO2017177732A1 publication Critical patent/WO2017177732A1/zh

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    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of light sources
    • 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
    • G02F1/133624—Illuminating devices characterised by their spectral emissions

Definitions

  • Embodiments of the present disclosure relate to the field of display technologies, and in particular, to a backlight module and a display device.
  • liquid crystal display technology With the continuous development of liquid crystal display technology, the application fields of liquid crystal display devices, especially color liquid crystal display devices, are also expanding, and the requirements for user experience are gradually increasing. For example, miniaturized thin and light liquid crystal displays have become the main liquid crystal display devices. development trend.
  • the backlight module is one of the important components of the liquid crystal display, and is used to provide the liquid crystal panel with light with sufficient brightness and uniformity.
  • an acrylic sheet is generally used as a light guide plate of a backlight module, and since it has a small absorption coefficient, it absorbs less light propagating therein, and relatively uniform emitted light can be obtained.
  • acrylic sheets PMMA have low temperature resistance and low strength.
  • the back plate (for example, the metal back plate and the plastic back plate) supports the acrylic plate to increase the strength of the light guide plate, which undoubtedly increases the overall thickness of the backlight module and adversely affects the miniaturization of the liquid crystal display.
  • Embodiments of the present disclosure provide a backlight module and a display device capable of using a light guide plate having a small thickness while obtaining a relatively uniform backlight, thereby improving display performance of the display device.
  • a backlight module includes a light guide plate, a first light source disposed along a first side of the light guide plate, and a first light guide plate along a first side of the light guide plate a plurality of second light sources disposed at least one of the two sides, wherein the plurality of second light sources have different color temperatures, and a color temperature of the second light source at different positions is according to the light guide plate
  • the light absorption characteristics are determined to compensate for the light absorbed by the light guide plate.
  • the light guide plate is a glass light guide plate.
  • the color temperature of the second source increases as the distance from the second source to the first side increases.
  • the chromaticity coordinates of the second source located at a distance h to the first side are determined by the following equation:
  • chromaticity coordinates are used to indicate a color temperature of the second light source
  • L(B) A is the brightness of the blue light at the first side
  • k is the absorption coefficient of the light guide plate to blue light
  • the first light source includes a plurality of sub-light sources, and the plurality of sub-light sources are equally spaced along a first side of the light guide plate;
  • the plurality of second light sources are equally spaced along at least one of the two sides of the light guide plate that are perpendicular to the first side.
  • the first light source and the second light source are one or more of a light emitting diode, a cathode fluorescent tube, an electroluminescent sheet, and an organic electroluminescent sheet.
  • the first side is one of a long side and a short side of the light guide plate.
  • the backlight module further includes a frame, and at least one of the first light source, the second light source, and the light guide plate is fixed to the frame.
  • a display device comprising the backlight module of any of the foregoing embodiments and a display panel located above the backlight module.
  • a backlight module and a display device are provided by adding a side of a light guide plate
  • the second light source having different color temperatures is used to compensate the light absorbed by the light guide plate when the light emitted by the first light source propagates in the light guide plate, so as to obtain relatively uniform outgoing light, prevent serious color shift phenomenon, and improve the display device. display effect.
  • the second light source can compensate for the absorbed light of the first light source, a higher strength material such as glass can be used as the light guide plate to greatly reduce the thickness of the backlight module or even the entire display device.
  • FIG. 1 schematically illustrates a top view of a backlight module in accordance with an embodiment of the present disclosure
  • FIG. 2 schematically illustrates a side view of a backlight module in accordance with an embodiment of the present disclosure
  • Figure 3 is a view schematically showing the relationship between the chromaticity coordinates and the color temperature in the chromaticity diagram
  • FIG. 4 schematically illustrates a top view of a backlight module in accordance with an embodiment of the present disclosure, wherein the low beam side A, the high beam side D, the distances H and h are labeled in FIG.
  • FIG. 5 schematically illustrates a side view of a display device in accordance with an embodiment of the present disclosure.
  • a backlight module and a display device capable of using a light guide plate having high strength and a small thickness while obtaining a relatively uniform backlight, thereby improving display performance of the display device.
  • FIG. 1 schematically illustrates a top view of a backlight module 100 in accordance with an embodiment of the present disclosure
  • FIG. 2 schematically illustrates a side view of a backlight module 100 in accordance with an embodiment of the present disclosure.
  • the backlight module 100 includes a light guide plate 101, a first light source 102, and a plurality of second light sources 103.
  • the first light source 101 is disposed along the first side 101a of the light guide plate 101.
  • the two light sources are disposed along at least one of the two side edges 101b of the light guide plate 101 that are perpendicular to the first side edge 101a.
  • the plurality of second light sources 103 have different color temperatures, and the second light source 103 at different positions
  • the magnitude of the color temperature can be determined according to the light absorption characteristics of the light guide plate 101 in order to compensate the light absorbed by the light guide plate 101. It can be understood that the color of the light compensated by the second light source corresponds to the color temperature of the second light source.
  • the second light source 103 can be configured to be the first distance.
  • the color temperature of the position of the light source 102 ie, the first side 101a
  • the color temperature of the position closer to the first light source 102 is greater than the color temperature of the position closer to the first light source 102, so that the color of the light emitted from the light guide plate is relatively uniform, and the absorption of blue light is avoided. The resulting color shift phenomenon.
  • the backlight module is configured to add a second light source having different color temperatures on the side of the light guide plate to compensate for absorption by the light guide plate when the light emitted by the first light source propagates in the light guide plate. Light to obtain a relatively uniform exit light to prevent severe color shift.
  • a material such as glass
  • high strength can be used as the light guide plate to reduce the back. The thickness of the light module.
  • the first side 101a of the light guide plate 101 may be the long side of the light guide plate 101, that is, the first light source 102 is disposed along the long side of the light guide plate 101, and correspondingly, the second light source 103 is along The short side of the light guide plate 101 is disposed. Further, a second light source 103 may be disposed on both short sides of the light guide plate 101 so that absorption of light emitted by the first light source 102 by the light guide plate can be compensated from both sides of the light guide plate, thereby obtaining more Uniform outgoing light.
  • the first light source and the second light source may be selected from one or more of a light emitting diode, a cathode fluorescent tube, an electroluminescent sheet, and an organic electroluminescent sheet.
  • the light guide plate 101 may be a glass light guide plate.
  • the glass has good high temperature resistance and high strength.
  • the use of a glass material as a light guide plate does not require the use of a back plate support, and a glass having a small thickness can be used, so that the thickness of the backlight module can be reduced.
  • the glass contains iron ions
  • the iron ions have a strong absorption effect on the blue component of the light incident on the glass light guide plate, and the farther away from the first light source 102, the more serious the blue light absorption, according to the color mixing of the three primary colors, away from
  • the position of the first light source 102 (high beam side) has a small proportion of blue light, and therefore the outgoing light at a position away from the first light source 102 (high beam side) is larger than the outgoing light at a position close to the first light source 102 (low beam side). Yellowish, that is, the color temperature is too small.
  • a second light source having a different color temperature may be disposed on the side of the light guide plate to compensate the absorbed blue light.
  • the second light source can be configured.
  • the second light source 103 so that the farther away from the first light source 102, the more compensation is applied to the blue light, so that a more uniform outgoing light can be obtained, preventing serious damage due to the absorption of blue light by the glass light guide plate. Color shift phenomenon.
  • FIG. 3 shows the relationship between chromaticity coordinates and color temperature in the chromaticity diagram.
  • a chromaticity diagram is a plan view showing various chromaticities in dots at different positions. Developed by the International Commission on Illumination (CIE) in 1931, it is called the CIE chromaticity diagram.
  • CIE chromaticity diagram has great practical value, any color, no matter the color of the light source It is the surface color, which can be calibrated in the chromaticity diagram, which makes the description of the color simple and accurate, and the synthesis of each color light is also clear. Therefore, in an embodiment of the present disclosure, the color temperature can be determined by the chromaticity coordinates in the chromaticity diagram.
  • the side where the first side of the light guide plate is located is the low light side A
  • the side opposite to the first side of the light guide plate and opposite to the first side is the low light side D
  • the light guide plate The distance between the high beam side D and the low beam side A is H, according to the law of absorption of light, having:
  • L (B) A, and L (B) D respectively, the luminance near the light blue A side and the side beam at D; blue light absorption coefficient k of the light guide plate.
  • L (R): L (G ): L (B) 1: 4.6: 0.06
  • L (R) A 1 / 0.06 * L (B) A
  • L (G) A 4.6/0.06*L(B) A
  • L(R), L(G), and L(B) are the luminances of red, green, and blue, respectively, and red at the far side D
  • the brightness of light and green light are:
  • r, g, and b are the three-color coordinates in the RGB system, respectively, which can be expressed by:
  • the chromaticity coordinates at a distance h to the first side of the light guide plate can also be derived:
  • a second light source having a suitable color temperature may be selected based on the above formula of the chromaticity coordinates at the distance h and disposed at a corresponding position of the light guide plate.
  • the second light source is disposed by means of the chromaticity coordinates described above, so that the second light source can more effectively compensate the light of the color absorbed by the light guide plate corresponding to the color temperature of the second light source to obtain uniformity.
  • the outgoing light is disposed by means of the chromaticity coordinates described above, so that the second light source can more effectively compensate the light of the color absorbed by the light guide plate corresponding to the color temperature of the second light source to obtain uniformity. The outgoing light.
  • the first light source may include one line light source disposed on the first side, and may also include a plurality of sub-light sources arranged at equal intervals along the first side of the light guide plate.
  • the plurality of second light sources may be equally spaced along one or both sides of the light guide plate that are perpendicular to the first side.
  • other embodiments are also possible.
  • the backlight module provided by the embodiment of the present disclosure may further include a frame 104 to relatively fix the positions of the first light source, the second light source, and the light guide plate.
  • the backlight module provided by the embodiment of the present disclosure may further include other optical films, such as a brightness enhancement sheet, a diffusion sheet, a reflection sheet, and the like.
  • FIG. 5 schematically illustrates a side view of a display device in accordance with an embodiment of the present disclosure.
  • the display device 20 includes the backlight module 100 and the display panel 200 in the foregoing embodiments, wherein the display panel 200 is located above the backlight module 100.
  • the display device provided in the embodiment can obtain relatively uniform light emitted by the backlight module, and reduce the color shift phenomenon caused by the light absorption of the light guide plate, thereby improving the display effect.
  • the display panel 300 may include a lower polarizer, a TFT array substrate, a liquid crystal layer, a color filter, an upper polarizer, and the like.
  • the display panel provided by the embodiment of the present disclosure can be applied to any one of a mobile phone, a tablet computer, a television, a notebook computer, a digital camera, or a navigator. A product or part that displays functionality.
  • an element or layer when an element or layer is referred to as being “on” another element or layer, it may be directly on the other element or layer, or an element or layer may be present; likewise, when the element or layer is When the other element or layer is "under”, it may be directly under the other element or layer, or there may be at least one intermediate element or layer; when the element or layer is referred to as being between the two or two layers It may be a single element or layer between two or two layers, or more than one intermediate element or layer may be present.

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Abstract

一种背光模组(100)及显示装置(20)。一种背光模组(100)，包括导光板(101)；沿所述导光板(101)的第一侧边(101a)设置的第一光源(102)；沿所述导光板(101)的与所述第一侧边(101a)垂直的两个侧边(101b)中的至少一个设置的多个第二光源(103)，其中，所述多个第二光源(103)具有不同的色温，位于不同位置处的所述第二光源(103)的色温的大小根据所述导光板(101)的吸光特性来确定，以便补偿由所述导光板(101)吸收的与所述第二光源(103)的色温对应的颜色的光。

Description

背光模组及显示装置
相关申请的交叉引用
本申请要求于2016年04月13日递交的中国专利申请第201610227299.3号的优先权和权益，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的实施例涉及显示技术领域，尤其涉及一种背光模组及显示装置。
背景技术
随着液晶显示技术的不断发展，液晶显示装置尤其是彩色液晶显示装置的应用领域也不断拓宽，并且对用户体验的要求也逐渐增高，例如，目前小型化轻薄型液晶显示器已经成为液晶显示器的主要发展趋势。
背光模组为液晶显示器的重要零组件之一，用于为液晶面板提供具有足够亮度和均匀性的光。目前，通常使用亚克力板作为背光模组的导光板，由于具有较小吸光系数，其对在其中传播的光的吸收较少，可以获得相对均匀的出射光。但是，众所周知，亚克力(PMMA)板具有较低的耐高温性和较低的强度，在亚克力板作为作导光板时，为了避免导光板弯曲变形，通常使用较大厚度的亚克力板，并且需要专门的背板(例如金属背板、塑胶背板)来支撑亚克力板，以增加导光板的强度，这无疑会增加背光模组的整体厚度，对液晶显示器的小型化起到不利的作用。
发明内容
本公开实施例提供了一种背光模组和显示装置，其能够使用较小厚度的导光板，同时可以获得相对均匀的背光，进而提高显示装置的显示效果。
根据本公开的一个实施例，提供一种背光模组，包括导光板；沿所述导光板的第一侧边设置的第一光源；沿所述导光板的与所述第一侧边垂直 的两个侧边中的至少一个设置的多个第二光源，其中，所述多个第二光源具有不同的色温，位于不同位置处的所述第二光源的色温的大小根据所述导光板的吸光特性来确定，以便补偿由所述导光板吸收的光。
在一个实施例中，所述导光板为玻璃导光板。
在一个实施例中，所述第二光源的色温随着所述第二光源到所述第一侧边的距离的增大而增大。
在一个实施例中，位于到所述第一侧边的距离h处的所述第二光源的色品坐标由以下等式确定：
Figure PCTCN2017070440-appb-000001
Figure PCTCN2017070440-appb-000002
其中，所述色品坐标用于指示所述第二光源的色温；
L(B)A为蓝光在所述第一侧边处的亮度；
k为导光板对蓝光的吸收系数；
Figure PCTCN2017070440-appb-000003
和
Figure PCTCN2017070440-appb-000004
为光谱的三刺激值。
在一个实施例中，所述第一光源包括多个子光源，所述多个子光源沿着所述导光板的第一侧边等间距排列；
在一个实施例中，所述多个第二光源沿所述导光板的与所述第一侧边垂直的两个侧边中的至少一个侧边等间距排列。
在一个实施例中，所述第一光源和所述第二光源为发光二极管、阴极荧光管、电致发光片和有机电致发光片中的一种或多种。
在一个实施例中，所述第一侧边为所述导光板的长边和短边中的一种。
在一个实施例中，所述背光模组还包括框架，所述第一光源、所述第二光源和所述导光板中至少一个固定于所述框架上。
根据本公开的另一个实施例，还提供一种显示装置，包括前述任意实施例所述的背光模组以及位于所述背光模组上方的显示面板。
根据本公开实施例的背光模组和显示装置，通过在导光板的侧边增设 具有不同色温的第二光源，用来补偿第一光源发出的光在导光板内传播时由导光板吸收的光，以便获得相对均匀的出射光，防止产生严重的色偏现象，提高显示装置的显示效果。此外，由于第二光源能够补偿第一光源的被吸收的光，因此可以使用强度较高的材料(如玻璃)作为导光板，以大大减小背光模组甚至是整个显示装置的厚度。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对本公开实施例描述中所需要使用的附图作简单地介绍，显而易见地，此处所说明的附图仅用来提供对本公开实施例的进一步理解，并不构成对本公开的不当限定，其中：
图1示意性示出根据本公开实施例的背光模组的俯视图；
图2示意性示出根据本公开实施例的背光模组的侧视图；
图3示意性示出色品图中色品坐标与色温之间的关系；
图4示意性示出根据本公开实施例的背光模组的俯视图，其中近光侧A、远光侧D、距离H和h在图4中标出。
图5示意性示出根据本公开实施例的显示装置的侧视图。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开实施方式作进一步地详细描述。应当理解，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。
需要说明的是，在附图中示出的各种部件和/或区域并非按比例绘制。并且在给定图或实施例中为了便于解释，仅明确示出或描述在这种背光模组或显示装置中常用的一个或多个部件和/或区域。
为了减少背光模组的厚度，人们进行了各种尝试，其中一种解决方案是采用具有较高强度的其他材料(如玻璃)来制作导光板。这些材料制成 的导光板可以具有较小的厚度，并且不需要使用专门的背板来支撑。然而，在实际使用中发现，从这些材料形成的导光板出射的光的某一成分(如蓝色)的光量较少，在用于显示装置的显示时出现比较严重的色偏现象。这是由于这些材料对入射到其内的光的该成分具有较强的吸收作用。一般地，距离光源越远，吸收越严重，严重影响背光模组的出射光的均匀性，进而影响显示器的显示效果。
在本公开的实施例中，提供了一种背光模组和显示装置，其能够使用具有高强度及较小厚度的导光板，同时可以获得相对均匀的背光，进而提高显示装置的显示效果。
图1示意性示出根据本公开实施例的背光模组100的俯视图；图2示意性示出根据本公开实施例的背光模组100的侧视图。如图1和图2所示，背光模组100包括导光板101、第一光源102以及多个第二光源103，其中，第一光源101沿导光板101第一侧边101a设置，多个第二光源沿导光板101的与第一侧边101a垂直的两个侧边101b中的至少一个侧边设置，该多个第二光源103具有不同的色温，位于不同位置处的第二光源103的色温的大小可以根据导光板101的吸光特性来确定，以便补偿由导光板101吸收的光。可以理解，第二光源所补偿的光的颜色与第二光源的色温相对应。
例如，当用于制作导光板101的材料对蓝光具有较强的吸收时，通常，距离第一光源102越远，对蓝光的吸收越强，因此，可以将第二光源103配置为距离第一光源102(即第一侧边101a)较远的位置的色温大于距离第一光源102较近的位置的色温，以使得从导光板射出的光的颜色相对均匀，避免由于蓝色光吸收较多而产生的色偏现象。
如上所述，根据本公开实施例的背光模组，通过在导光板的侧边增设具有不同色温的第二光源，用来补偿当第一光源发出的光在导光板内传播时由导光板吸收的光，以便获得相对均匀的出射光，防止产生严重的色偏现象。此外，由于第二光源能够补偿第一光源的被吸收的光，因此可以使用虽然具有吸光性、但强度较高的材料(如玻璃)作为导光板，以减小背 光模组的厚度。
在一个可选的实施例中，导光板101的第一侧边101a可以为导光板101的长边，即第一光源102沿着导光板101的长边设置，相应地，第二光源103沿着导光板101的短边设置。进一步可选地，可以在导光板101的两个短边都设置第二光源103，以便从导光板的两侧都可以补偿由导光板对第一光源102发出的光的吸收，从而可以获得更均匀的出射光。
在一个示例性的实施例中，第一光源和第二光源可以选自发光二极管、阴极荧光管、电致发光片和有机电致发光片中的一种或多种。
在一个示例性实施例中，导光板101可以为玻璃导光板。玻璃具有较好的耐高温性和较高的强度，使用玻璃材料作为导光板不需要使用背板支撑，并且可以采用较小厚度的玻璃，因此可以减少背光模组的厚度。但是由于玻璃中含有铁离子，铁离子对入射到玻璃导光板中的光中的蓝色成分具有较强的吸收作用，距离第一光源102越远，蓝光吸收越严重，根据三基色混色，远离第一光源102的位置(远光侧)蓝光的比例较少，因此在远离第一光源102的位置(远光侧)的出射光比靠近第一光源102的位置(近光侧)的出射光偏黄，即色温偏小。在本公开实施例中，为了避免由于玻璃导光板对蓝光的吸收而导致的色偏现象，可以在导光板的侧边设置具有不同色温的第二光源来补偿被吸收的蓝光。
如上所述，在使用玻璃作为导光板的情况下，距离第一光源102越远处，玻璃导光板对蓝光的吸收越多，因此，为了能够有效补偿被吸收的蓝光，可以将第二光源配置为距离第一光源102所在的侧边101a越远处第二光源的色温越大，也就是说，第二光源103的色温随着与第一侧边101a的距离的增大而增大。通过使用如此设置第二光源103，使得距离第一光源102越远的位置，对蓝光的补偿越多，因此可以获得较均匀的出射光，防止由于玻璃导光板对蓝光的吸收作用而导致的严重色偏现象。
图3示出在色品图中色品坐标与色温之间的关系。色品图是以不同位置的点表示各种色品的平面图。1931年由国际照明委员会(CIE)制定，故称CIE色品图。CIE色品图有很大实用价值，任何颜色，不论是光源色还 是表面色，都可在色品图中标定出来，这使颜色的描述既简便又准确，各色光的合成途径也一目了然。因此，在本公开的实施例中，可以通过色品图中的色品坐标来确定色温。
如图4所示，导光板的第一侧边所在的一侧为近光侧A，远离导光板的第一侧边并与第一侧边相对的一侧为近光侧D，导光板的远光侧D和近光侧A之间的距离为H，根据光的吸收定律，具有：
L(B)D＝L(B)A*e-k*H
其中，L(B)A和L(B)D分别是蓝光在近光侧A和远光侧D处的亮度；k为导光板对蓝光的吸收系数。
根据三基色混合成白光的亮度比例L(R):L(G):L(B)＝1:4.6:0.06，可导出：L(R)A＝1/0.06*L(B)A；L(G)A＝4.6/0.06*L(B)A，其中，L(R)、L(G)和L(B)分别为红光、绿光和蓝光的亮度，则远光侧D处红光和绿光的亮度分别为：
L(R)D＝1/0.06*L(B)A*e-k*h
L(G)D＝4.6/0.06*L(B)A*e-k*h
色品坐标通过下式表示：
Figure PCTCN2017070440-appb-000005
Figure PCTCN2017070440-appb-000006
其中r、g、b分别为RGB系统下的三色坐标，它们可以通过下式表示：
Figure PCTCN2017070440-appb-000007
Figure PCTCN2017070440-appb-000008
Figure PCTCN2017070440-appb-000009
其中，
Figure PCTCN2017070440-appb-000010
和
Figure PCTCN2017070440-appb-000011
为光谱的三刺激值。
综合以上公式可得出，位于远光侧D处的色品坐标：
Figure PCTCN2017070440-appb-000012
Figure PCTCN2017070440-appb-000013
类似地，还可以导出在到导光板的第一侧边的距离h处的色品坐标：
Figure PCTCN2017070440-appb-000014
Figure PCTCN2017070440-appb-000015
在本公开的实施例中，可以基于以上在距离h处的色品坐标的公式，选取具有合适色温的第二光源并将其设置在导光板的相应位置处。
在本公开实施例中，通过上述色品坐标的方式来设置第二光源，能够使得第二光源更有效地补偿与第二光源的色温相对应的由导光板吸收的颜色的光，以获得均匀的出射光。
需要说明的是，在上述实施例中，详细说明了通过第二光源对由导光板对蓝光的吸收的补偿方式，可以理解，对由导光板吸收的其他颜色的光(如红光和绿光)可以采用类似的方式来补偿。
在本公开的一个实施例中，可以理解，第一光源可以包括设置在第一侧边的一个线光源，也可以包括沿着导光板的第一侧边等间距排列的多个子光源。相应地，多个第二光源可以沿着导光板的与第一侧边垂直的一个或两个侧边等间距排列。当然，其他实施例也是可行的。
如图1和图2所示，本公开实施例提供的背光模组还可以包括框架104，以使第一光源、第二光源、导光板的位置相对固定。
应当指出，本公开实施例提供的背光模组还可以包括其他的光学膜片，例如，增光片、扩散片、反射片等。
图5示意性示出根据本公开实施例的显示装置的侧视图。显示装置20包括前述实施例中的背光模组100和显示面板200，其中，显示面板200位于背光模组100的上方。本实施例提供的显示装置可以通过背光模组获得较均匀的出射光，减少由于导光板对光的吸收产生的色偏现象，从而能够提高显示效果。
在一个示例中，显示面板300可以包括下偏光片、TFT阵列基板、液晶层、彩色滤光片、上偏光片等。本公开实施例提供的显示面板可以应用于手机、平板电脑、电视机、笔记本电脑、数码相机或导航仪等任何具有 显示功能的产品或部件。
需要说明的是，在本公开的描述中，术语“上”、“之上”、“下”、“之下”、“顶”、“底”、“之间”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，当元件或层被称为在另一元件或层“上”时，它可以直接在该另一元件或层上，或者可以存在中间的元件或层；同样，当元件或层被称为在另一元件或层“下”时，它可以直接在该另一元件或层下，或者可以存在至少一个中间的元件或层；当元件或层被称为在两元件或两层“之间”时，其可以为该两元件或两层之间的唯一的元件或层，或者可以存在一个以上的中间元件或层。
此外，还需要说明的是，当介绍本申请的元素及其实施例时，冠词“一”、“一个”、“该”和“所述”旨在表示存在一个或者多个要素。在本公开的描述中，除非另有说明，“多个”的含义是两个或两个以上。用语“包含”、“包括”、“含有”和“具有”旨在包括性的并且表示可以存在除所列要素之外的另外的要素。术语“第一”、“第二”仅用于描述的目的，而不能理解为指示或暗示相对重要性。
以上所述仅为本公开的较佳实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (10)

  1. 一种背光模组，包括：
    导光板；
    沿所述导光板的第一侧边设置的第一光源；
    沿所述导光板的与所述第一侧边垂直的两个侧边中的至少一个设置的多个第二光源，其中
    所述多个第二光源具有不同的色温，位于不同位置处的所述第二光源的色温的大小根据所述导光板的吸光特性来确定，以便补偿由所述导光板吸收的光。
  2. 根据权利要求1所述的背光模组，其中，所述导光板为玻璃导光板。
  3. 根据权利要求2所述的背光模组，其中，所述第二光源的色温随着所述第二光源到所述第一侧边的距离的增大而增大。
  4. 根据权利要求3所述的背光模组，其中，位于到所述第一侧边的距离h处的所述第二光源的色品坐标由以下等式确定：
    Figure PCTCN2017070440-appb-100001
    Figure PCTCN2017070440-appb-100002
    其中，所述色品坐标用于指示所述第二光源的色温；
    L(B)A为蓝光在所述第一侧边处的亮度；
    k为导光板对蓝光的吸收系数；
    Figure PCTCN2017070440-appb-100003
    和
    Figure PCTCN2017070440-appb-100004
    为光谱的三刺激值。
  5. 根据权利要求1所述的背光模组，其中，所述第一光源包括多个子光源，所述多个子光源沿着所述导光板的第一侧边等间距排列。
  6. 根据权利要求1所述的背光模组，其中，所述多个第二光源沿所述导光板的与所述第一侧边垂直的两个侧边中的至少一个侧边等间距排列。
  7. 根据权利要求1-6中任一项所述的背光模组，其中，所述第一光源和所述第二光源为发光二极管、阴极荧光管、电致发光片和有机电致发光 片中的一种或多种。
  8. 根据权利要求1-6中任一项所述的背光模组，其中，所述第一侧边为所述导光板的长边和短边中的一种。
  9. 根据权利要求1-6中任一项所述的背光模组，其中，所述背光模组还包括框架，所述第一光源、所述第二光源和所述导光板中至少一个固定于所述框架上。
  10. 一种显示装置，包括如权利要求1-9中任一项所述的背光模组和位于所述背光模组上方的显示面板。
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