WO2020258766A1 - 背光模组及电子设备 - Google Patents

背光模组及电子设备 Download PDF

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Publication number
WO2020258766A1
WO2020258766A1 PCT/CN2019/126119 CN2019126119W WO2020258766A1 WO 2020258766 A1 WO2020258766 A1 WO 2020258766A1 CN 2019126119 W CN2019126119 W CN 2019126119W WO 2020258766 A1 WO2020258766 A1 WO 2020258766A1
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Prior art keywords
backlight module
diffusion film
infrared transparent
infrared
light
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PCT/CN2019/126119
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English (en)
French (fr)
Inventor
张小齐
杨运清
蔡锋毅
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深圳市隆利科技股份有限公司
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Publication of WO2020258766A1 publication Critical patent/WO2020258766A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the present invention relates to the field of communication technology, and in particular to a backlight module and electronic equipment for fingerprint recognition in an LCD screen.
  • Fingerprint sensing and matching is a reliable and widely used technology.
  • the common method of fingerprint identification involves scanning a sample fingerprint or its image and storing the image and/or unique characteristics of the fingerprint image.
  • the characteristics of the sample fingerprint can be compared with the information of the reference fingerprint already existing in the database to determine the correct identification of the user , For example for verification purposes.
  • in-display fingerprint recognition has become more and more popular due to its ease of operation and versatility, as well as its suitability for compact portable electronic devices.
  • the fingerprint recognition display device in the LCD screen obviously has a larger use scene range and better cost advantage than the fingerprint recognition display device in the OLED screen.
  • the fingerprint recognition display device in the screen based on the LCD display is not fully mature, especially Take into account the effective penetration and accurate collection of fingerprint identification signals on the LCD module.
  • the fingerprints on the glass cover 104 covered on the LCD display are recognized by pressing; however, the optical signal used to recognize the fingerprints must pass through the LCD display at least The screen and the glass cover 104, and since the LCD display is composed of the LCD module 102 and the backlight module 101, the glass cover has a certain thickness. Therefore, when the optical signal passes through the LCD module, the backlight module, and the glass cover, severe refraction, scattering, and even total reflection occur.
  • CN107644215A discloses an optical fingerprint assembly and a mobile terminal to effectively improve the clarity of fingerprint recognition.
  • An optical fiber collimation layer is arranged between a transparent cover plate and a photosensitive element.
  • the optical fiber collimation layer is used to face the transparent cover plate
  • the light emitted from the end face of the photosensitive element is converted into collimated light, which is transmitted to the photosensitive element.
  • the optical fiber collimation layer and other optical function layers increase the thickness of the LCD mobile terminal, and there is no distinction between the biological fingerprint optical signal and the display optical signal, resulting in uneven display images and low fingerprint recognition accuracy.
  • the main technical problem to be solved by the present invention is to provide a backlight module and electronic device for fingerprint recognition in an LCD screen, which can make the fingerprint recognition signal effectively pass through the backlight module without disposing a diffuser and prism sheet. Thoroughly and accurately collect.
  • the backlight module includes a light source and a light guide plate arranged on one side of the light source, a reflective sheet arranged below the light guide plate, and an infrared transparent diffusion film arranged above the light guide plate, And a fingerprint recognition device arranged under the infrared transparent diffusion film to identify biological fingerprint optical signals; wherein the infrared transparent diffusion film contains visible light diffusing particles, so that visible light diffuses on the infrared transparent diffusion film, but infrared light does not diffuse through the film.
  • the infrared transparent diffusion film contains visible light diffusing particles, so that visible light diffuses on the infrared transparent diffusion film, but infrared light does not diffuse through the film.
  • the visible light diffusion particles include at least one of Au, Ag, Al, Cu, Zn, Pt, Co, Ni, Cu 2 O, CuO, and CdO.
  • the visible light diffusion particles have a particle size of 2nm-50 ⁇ m, and emit light in the form of non-directional scattering of visible light, so that the infrared transparent diffusion film realizes the function of uniform diffusion of visible light.
  • Infrared light is basically not absorbed or scattered by the visible light diffusion particles, so it can pass through the infrared transparent diffusion film substantially vertically.
  • the infrared transparent diffusion film adjusts the emitted infrared optical signal to parallel light substantially perpendicular to the plane of the infrared transparent diffusion film, while ensuring that visible light can be uniformly scattered.
  • the quantum dot backlight module of the present invention can be used for detecting infrared light signals that can pass through the backlight module and then accurately propagate to biological detection objects, such as fingerprints, even without the diffusion sheet and prism sheet.
  • biological detection objects such as fingerprints
  • the feedback infrared light signal of the detection object can be folded back nearly non-destructively through the infrared transparent diffusion film and the backlight module, and is accurately and effectively collected by the optical sensor under the LCD screen, while maintaining the brightness of the visible light source of the backlight module. Uniformity, and then realize the fingerprint recognition function of the LCD display screen and maintain the display effect.
  • the quantum dot backlight module of the present invention reduces the arrangement of the diffusion sheet and the prism sheet, provides more design space for the LCD display with the fingerprint recognition function in the screen, and realizes the lightness and thinness of the whole electronic device.
  • the infrared transparent diffusion film is provided with light diffusion units, such as a rounded prism array and a rounded trapezoidal array, for diffusing and evenly distributing visible light.
  • light diffusion units such as a rounded prism array and a rounded trapezoidal array
  • the backlight module further includes an optical sensor element to transmit and/or receive a biological fingerprint optical signal; the biological fingerprint optical signal is infrared light.
  • the fingerprint identification device is arranged between the light guide plate and the reflective sheet; or the fingerprint identification device is arranged between the light guide plate and the infrared transparent diffusion film; or the fingerprint identification device is arranged between Below the reflective sheet.
  • the backlight module further includes a prism sheet, and the prism sheet is arranged above the infrared transparent diffusion film.
  • the backlight module further includes a diffusion sheet, which is arranged between the infrared transparent diffusion film and the prism sheet.
  • the fingerprint identification device is embedded in the infrared transparent diffusion film, instead of placing the fingerprint identification device under the quantum dot composite film.
  • the backlight module of the present invention is integrated with the LCD panel, the glass cover plate and the touch screen module into an electronic device, which can be applied to LCD displays and electronic devices for fingerprint identification.
  • the backlight module of the present invention is applied to an electronic device for fingerprint identification, and can realize accurate identification and verification of biological fingerprint information.
  • Fig. 1 is an in-screen fingerprint identification display device of a prior art LCD display.
  • FIG. 2 is an exploded view of the backlight module of Embodiment 1 of the present invention.
  • Example 3 is a cross-sectional structure diagram of the infrared transparent diffusion film of Example 1 of the present invention.
  • FIG. 4 is an exploded view of the backlight module according to Embodiment 2 of the present invention.
  • FIG. 5 is an exploded view of the backlight module of Embodiment 3 of the present invention.
  • FIG. 6 is an exploded view of the backlight module of Embodiment 4 of the present invention.
  • the backlight module of Embodiment 1 of the present invention includes a light source 221 and a light guide plate 220 arranged on one side of the light source 221, a reflective sheet 210 arranged below the light guide plate 220, and infrared transparent arranged above the light guide plate 220
  • the diffusion film 230 and the fingerprint recognition device 103 arranged under the infrared transparent diffusion film 230 and the reflective sheet 210 to identify the optical signal of biological fingerprints; wherein, the infrared transparent diffusion film 230 contains uniformly distributed CdO nanoparticles with a particle size of approximately 20 nm, as shown in the cross-sectional structure diagram of the infrared transparent diffusion film in FIG.
  • CdO nanoparticles emit light in a non-directional scattering form to visible light, so the infrared transparent diffusion film 230 realizes the function of uniformly diffusing visible light.
  • the reflective sheet 210 is an infrared transparent visible light reflective material, which can reflect the visible light emitted by the light guide plate with high reflectivity on the one hand, and can transmit infrared light nearly losslessly on the other hand.
  • the backlight module of this embodiment is used to detect the emitted infrared optical signal accurately propagating to the detected object for detection.
  • the feedback infrared light signal of the detected object can pass through the infrared transparent diffusion film 230 and the backlight module nearly without damage. And it is accurately and effectively collected by the optical sensor under the LCD screen to realize the fingerprint recognition function of the LCD display.
  • the light emitted from the light guide plate 220 propagates to the infrared transparent diffusion film 230 to generate non-directional scattered light, so the infrared transparent diffusion film 230 realizes the function of uniformly diffusing visible light.
  • the infrared light is basically not absorbed or scattered by the CdO nanoparticles, so it can pass through the infrared transparent diffusion film 230 substantially vertically.
  • the infrared transparent diffusion film 230 adjusts the emitted infrared optical signal to parallel light substantially perpendicular to the plane of the infrared transparent diffusion film 230, while ensuring that visible light can be uniformly scattered.
  • the quantum dot backlight module of this embodiment reduces the arrangement of the diffusion sheet and the prism sheet, provides more design space for the LCD display with the in-screen fingerprint recognition function, and realizes the lightness and thinness of the whole electronic device.
  • the infrared transparent diffusion film 230 is provided with light diffusion units of a trapezoidal cylindrical light diffusion array.
  • the fingerprint identification device 103 of the backlight module also includes an optical sensor element to transmit and receive the biological fingerprint optical signal; the biological fingerprint optical signal is infrared light.
  • the backlight module of this embodiment does not need to be provided with a diffusion sheet and a prism sheet, and the infrared light signal used for detection can pass through the backlight module and be accurately transmitted to the biological detection object, such as fingerprints.
  • the detection object The feedback infrared light signal can be fold back nearly non-destructively through the infrared transparent diffusion film 230 and the backlight module, and is accurately and effectively collected by the optical sensor under the LCD screen, while maintaining the brightness and uniformity of the visible light source of the backlight module. Furthermore, the fingerprint recognition function of the LCD display and the display effect are maintained.
  • FIG. 4 is a cross-sectional structure diagram of a backlight module based on an infrared transparent diffusion film according to Embodiment 2 of the present invention.
  • the fingerprint identification device is arranged between the light guide plate 220 and the reflection 210.
  • FIG. 5 is a cross-sectional structure diagram of a backlight module based on an infrared transparent diffusion film according to Embodiment 3 of the present invention.
  • the fingerprint identification device is disposed between the light guide plate 220 and the infrared transparent diffusion film 230.
  • FIG. 6 is a cross-sectional structure diagram of a backlight module based on an infrared transparent diffusion film according to Embodiment 4 of the present invention.
  • the backlight module is also provided with a prism sheet 240 and a diffusion sheet 250.
  • the prism sheet 240 is set on the infrared transparent diffusion sheet.
  • the diffusion sheet 250 is disposed between the infrared transparent diffusion film 230 and the prism sheet 240.
  • the prism sheet 240 and the diffusion sheet 250 can further optimize the light output effect of the backlight source.

Abstract

一种用于LCD屏内指纹识别的背光模组，背光模组包括光源(221)以及设置在光源(221)一侧的导光板(220)，设置在导光板(220)下方的反射片(210)，设置在导光板(220)上方的红外透明扩散膜(230)，以及设置在红外透明扩散膜(230)下方的指纹识别装置(103)，以识别生物指纹光学信号；其中，红外透明扩散膜(230)含有可见光扩散粒子，以使得可见光在红外透明扩散膜(230)上扩散，同时红外光无散射透过红外透明扩散膜(230)。背光模组使得LCD模组能够使指纹识别信号在LCD模组上有效穿透并精确收集，实现LCD显示设备的屏内指纹识别功能。

Description

背光模组及电子设备 技术领域
本发明涉及通信技术领域，尤其涉及一种用于LCD屏内指纹识别的背光模组以及电子设备。
背景技术
指纹感测和匹配是一种可靠且广泛使用的技术。指纹识别的常见方法涉及扫描样本指纹或其图像并存储指纹图像的图像和/或独特特征，可以将样本指纹的特征与已经存在于数据库中的参考指纹的信息进行比较，以确定用户的正确识别，例如用于验证目的。特别地，目前屏内(in display)指纹识别凭借其易操作性和多功能性以及适用于紧凑型便携式电子设备，而变得越来越流行。LCD屏内指纹识别显示设备明显要比OLED屏内指纹识别显示设备具有更大的使用场景范围和更好的成本优势，但是，基于LCD显示器的屏内指纹识别显示设备尚未完全成熟，特别是无法兼顾指纹识别信号在LCD模组上的有效穿透和精确收集。
在LCD显示器的屏内指纹识别显示设备中，如图1所示，通过识别按压覆盖在LCD显示屏上的玻璃盖板104上的指纹；然而用于识别指纹的光学信号至少要穿过LCD显示屏和玻璃盖板104，且由于LCD显示屏由LCD模组102和背光模组101构成，另外玻璃盖板具备一定的厚度。因此，光学信号在透过LCD模组、背光模组和玻璃盖板的过程中会发生比较严重的折射和散射，甚至全反射。另外，当将指纹识别单元103放置在背光模组上方时，从显示屏的观察角度，下方设置指纹识别单元的显示区域之透光率相比其他不设置指纹识别单元的的显示区域之透光率要低，而底部的LED背光源提供的是均匀的平面光源，下方设置指纹识别单元的显示区域比其他区域更暗，液晶显示装置的显示区亮暗不均匀的现象。CN107644215A公开了一 种光学指纹组件及移动终端，以有效提升指纹识别的清晰度，其在透明盖板与感光元件之间设置有光纤准直层，光纤准直层用于将从透明盖板朝向感光元件的端面出射的光线转化为准直光，传导至所述感光元件。但是光纤准直层及其他光学功能层增加了LCD移动终端的厚度，对于生物指纹光学信号和显示光学信号没有区分处理，导致显示图像不均匀而且指纹识别精度较低。
因此，基于LCD显示器的屏内指纹识别的实现，需要对指纹识别模组的整体设计改进。
发明内容
本发明主要解决的技术问题是提供一种用于LCD屏内指纹识别的背光模组以及电子设备，在不设置扩散片和棱镜片的情况下，能够使得指纹识别信号在背光模组上有效穿透并精确收集。
为解决上述技术问题，本发明采用的一个技术方案是：背光模组包括光源以及设置在光源一侧的导光板，设置在导光板下方的反射片，设置在导光板上方的红外透明扩散膜，以及设置在红外透明扩散膜下方的指纹识别装置，以识别生物指纹光学信号；其中，红外透明扩散膜含有可见光扩散粒子，以使得可见光在红外透明扩散膜上扩散，但是红外光无散射透过所述红外透明扩散膜。
所述可见光扩散粒子包括Au、Ag、Al、Cu、Zn、Pt、Co、Ni、Cu 2O、CuO、CdO中至少一种粒子。可见光扩散粒子的粒径尺寸在2nm-50μm，并且以可见光的非定向散射形式发光，使得红外透明扩散膜实现可见光均匀扩散的功能。红外光基本上不被可见光扩散粒子吸收或散射，因此可以基本垂直地透过红外透明扩散膜。这里，红外透明扩散膜将出射的红外光学信号调整为基本垂直红外透明扩散膜平面的平行光，同时确保可见光可以均匀散射。
本发明的量子点背光模组，即便在不设置扩散片和棱镜片的情况下，也可以用于检测的红外光信号可透过背光模组进而精确传播至生物检测对象，例如指纹，另一方面，检测对象的反馈红外光信号可以接近无损地折 返透过红外透明扩散膜和背光模组，并被LCD屏幕底下的光学传感器精确有效地采集，同时保持背光模组的可见光源的发光亮度和均匀度，进而实现LCD显示器的屏内指纹识别功能识别和显示效果保持。本发明的量子点背光模组减少了扩散片和棱镜片的设置，为具有屏内指纹识别功能识别功能的LCD显示器提供了更多的设计空间并实现电子设备整机的轻薄化。
优选的，红外透明扩散膜设置有光扩散单元，如圆角棱柱阵列、圆角梯形阵列，用于将可见光进行扩散均匀分布。
优选的，背光模组还包括光学传感器元件，以发射和/或接收生物指纹光学信号；所述生物指纹光学信号为红外光。
优选的，指纹识别装置设置于所述导光板和所述反射片之间；或者所述指纹识别装置设置于所述导光板和所述红外透明扩散膜之间；或者所述指纹识别装置设置于所述反射片的下方。
优选的，背光模组还包括棱镜片，棱镜片设置在红外透明扩散膜的上方。
优选的，背光模组还包括扩散片，扩散片设置在所述红外透明扩散膜和所述棱镜片之间。
优选的，指纹识别装置内嵌设置于红外透明扩散膜之内，以替换将所述指纹识别装置设置在所述量子点复合膜下方。
根据本发明之实施例，本发明之背光模组与LCD面板、玻璃盖板和触屏模组整合成电子装置，其可应用于LCD显示器和用于指纹识别的电子装置。本发明之背光模组应用于指纹识别的电子装置，可以实现对生物指纹信息的精确识别和验证。
附图说明
本发明及其优点将通过研究以非限制性实施例的方式给出，并通过所附附图所示的特定实施方式的详细描述而更好的理解，其中：
图1是现有技术的LCD显示器的屏内指纹识别显示设备。
图2是本发明实施例1的背光模组的爆炸视图。
图3是本发明实施例1的红外透明扩散膜的截面结构示图。
图4是本发明实施例2的背光模组的爆炸视图。
图5是本发明实施例3的背光模组的爆炸视图。
图6是本发明实施例4的背光模组的爆炸视图。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述，以使本发明的优点和特征能更易于被本领域技术人员理解，从而对本发明的保护范围做出更为清楚明确的界定。
实施例1
首先，通过图2、图3，就本发明的实施例1的背光模组进行说明。依照本发明实施例1之背光模组，背光模组包括光源221以及设置在光源221的一侧的导光板220，设置在导光板220下方的反射片210，设置在导光板220上方的红外透明扩散膜230，以及设置在红外透明扩散膜230和反射片210下方的指纹识别装置103，以识别生物指纹光学信号；其中，红外透明扩散膜230含有均匀分布的CdO纳米粒子，其粒径约为20nm，如图3红外透明扩散膜的截面结构示图所示，CdO纳米粒子对可见光是不定向的散射形式出光，因此红外透明扩散膜230实现了可见光均匀扩散的功能。反射片210为红外透明的可见光反射材料，其一方面可以将导光板发出的可见光进行高反射率的反射，另一方面可以接近无损的透过红外光。本实施例的背光模组用于探测的出射红外光学信号准确传播至被检测对象进行探测，另一方面检测对象的反馈红外光信号可以接近无损地透过红外透明扩散膜230和背光模组，并被LCD屏幕底下的光学传感器精确有效地采集，进而实现LCD显示器的屏内指纹识别功能识别。
导光板220的出光传播至红外透明扩散膜230产生不定向的散射形式出光，因此红外透明扩散膜230实现了可见光均匀扩散的功能。而红外光 基本不会被CdO纳米粒子吸收或散射，因此可以基本垂直透过红外透明扩散膜230。这里，红外透明扩散膜230将出射的红外光学信号调整为基本垂直红外透明扩散膜230平面的平行光，同时保证可见光可以均匀散射。本实施例的量子点背光模组减少了扩散片和棱镜片的设置，为具有屏内指纹识别功能识别功能的LCD显示器提供了更多的设计空间并实现电子设备整机的轻薄化。
红外透明扩散膜230设置有梯形圆柱体光扩散阵列的光扩散单元。
背光模组的指纹识别装置103还包括光学传感器元件，以发射和接收生物指纹光学信号；生物指纹光学信号为红外光。
本实施例的背光模组在不需要设置扩散片和棱镜片的情况下，用于检测的红外光信号可透过背光模组进而精确传播至生物检测对象，例如指纹，另一方面，检测对象的反馈红外光信号可以接近无损地折返透过红外透明扩散膜230和背光模组，并被LCD屏幕底下的光学传感器精确有效地采集，同时保持背光模组的可见光源的发光亮度和均匀度，进而实现LCD显示器的屏内指纹识别功能识别和显示效果保持。
实施例2
请参照图4，是本发明的实施例2的基于红外透明扩散膜的背光模组的截面结构示图。以下仅就实施例2与实施例1的相异之处进行说明，关于相似之处在此不再赘述，指纹识别装置设置于所述导光板220和所述反射210片之间。
实施例3
请参照图5，是本发明的实施例3的基于红外透明扩散膜的背光模组的截面结构示图。以下仅就实施例3与实施例1的相异之处进行说明，关于相似之处在此不再赘述，指纹识别装置设置于导光板220和所述红外透明扩散膜230之间。
实施例4
请参照图6，是本发明的实施例4的基于红外透明扩散膜的背光模组的截面结构示图。以下仅就实施例4与实施例1的相异之处进行说明，关于相似之处在此不再赘述，背光模组还设置有棱镜片240和扩散片250，棱镜片240设置在红外透明扩散膜230的上方，扩散片250设置于红外透明扩散膜230和棱镜片240之间。棱镜片240和扩散片250可以进一步优化背光源的出光效果。
虽然在上文中已经参考一些实施例对本发明进行了描述，然而在不脱离本发明的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，本发明所披露的各个实施例中的各项特征均可通过任意方式相互结合起来使用，在本说明书中未对这些组合的情况进行穷举性的描述是出于省略篇幅和节约资源的考虑。因此，本发明并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (10)

  1. 一种背光模组，其包括：
    光源以及设置在所述光源一侧的导光板，设置在所述导光板下方的反射片，设置在所述导光板上方的红外透明扩散膜，以及设置在所述红外透明扩散膜下方的指纹识别装置，以识别生物指纹光学信号；
    其中，所述红外透明扩散膜含有可见光扩散粒子，以使得可见光在所述红外透明扩散膜上扩散，同时红外光无散射透过所述红外透明扩散膜。
  2. 根据权利要求1所述的背光模组，其特征在于：所述可见光扩散粒子包括Au、Ag、Al、Cu、Zn、Pt、Co、Ni、Cu 2O、CuO、CdO中至少一种粒子。
  3. 根据权利要求2所述的背光模组，其特征在于：所述红外透明扩散膜还设置有光扩散单元。
  4. 根据权利要求1所述的背光模组，其特征在于：所述背光模组还包括光学传感器元件，以发射和/或接收生物指纹光学信号；所述生物指纹光学信号为红外光。
  5. 根据权利要求1所述的背光模组，其特征在于：所述指纹识别装置设置于所述导光板和所述反射片之间；或者所述指纹识别装置设置于所述导光板和所述红外透明扩散膜之间；或者所述指纹识别装置设置于所述反射片的下方。
  6. 根据权利要求1所述的背光模组，其特征在于：所述指纹识别装 置内嵌设置于所述红外透明扩散膜。
  7. 根据权利要求1所述的背光模组，其特征在于：所述背光模组还包括棱镜片，所述棱镜片设置在所述红外透明扩散膜的上方。
  8. 根据权利要求7所述的背光模组，其特征在于：所述背光模组还包括扩散片，所述扩散片设置在所述红外透明扩散膜和所述棱镜片之间。
  9. 根据权利要求1所述的背光模组，其特征在于：指纹识别装置内嵌设置于红外透明扩散膜之内，以替换将所述指纹识别装置设置在所述量子点复合膜下方的设置方式。
  10. 一种用于指纹识别的电子设备，包括：权利要求1-9中任一所述的背光模组、LCD面板、玻璃盖板和触屏模组。
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