CN114355668A - Backlight module and display module - Google Patents

Backlight module and display module Download PDF

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Publication number
CN114355668A
CN114355668A CN202111618208.6A CN202111618208A CN114355668A CN 114355668 A CN114355668 A CN 114355668A CN 202111618208 A CN202111618208 A CN 202111618208A CN 114355668 A CN114355668 A CN 114355668A
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China
Prior art keywords
backlight
film
area
backlight source
backlight module
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CN202111618208.6A
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Chinese (zh)
Inventor
陈锦
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Guangzhou China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Guangzhou China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN202111618208.6A priority Critical patent/CN114355668A/en
Publication of CN114355668A publication Critical patent/CN114355668A/en
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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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one

Abstract

The application discloses backlight unit and display module assembly, backlight unit has a first district and a second district, includes: a backlight source; the reflecting film is arranged corresponding to the backlight source, extends from the first area to the second area, is used for reflecting the light emitted by the backlight source to the light emitting side, and comprises a first reflecting film and a second reflecting film, wherein the first reflecting film is positioned in the first area, and the second reflecting film is positioned in the second area; the reflectivity of the first reflecting film is larger than that of the second reflecting film, so that the backlight brightness of the first area is larger than that of the second area. Therefore, the problem that the brightness of the first area is lower than that of the second area due to the low opening ratio of the first area is solved, the brightness of the first area and the brightness of the second area are uniform, and the visual experience of a user is improved.

Description

Backlight module and display module
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display module comprising the backlight module.
Background
With the development of science and technology, users have higher and higher requirements on the display effect and functions of the display device. Display devices with fingerprint recognition function are gradually spread throughout the life of people, such as mobile phones, personal digital assistants, computers and other electronic devices. In the existing display device based on the optical fingerprint identification technology, a fingerprint identification sensor is formed based on a semiconductor device, the characteristic that the semiconductor device generates leakage current when being irradiated by light is utilized to realize fingerprint detection, specifically, the fingerprint identification process of a display module is that a finger is in contact with the surface of glass usually, a fingerprint ridge is in contact with the glass, and a fingerprint valley is suspended. When light beams are emitted from the surface of the glass and are reflected by fingers, the difference exists between the reflectivity of the fingerprint ridges and the reflectivity of the fingerprint valleys and the interface of the glass, and the light intensity difference reflected by the fingerprint ridges and the fingerprint valleys can be detected by adopting the light sensing element, so that the fingerprints are identified.
In order to compromise screen occupation ratio and fingerprint identification function, the first district can be set up in the display area of display module assembly, consequently can arrange more devices such as thin-film transistor in the first district to lead to the aperture opening ratio reduction in the first district, the uneven problem of display module assembly luminance appears.
Therefore, improvement is urgently needed to overcome the defects in the prior art.
Disclosure of Invention
An object of the present application is to provide a backlight module and a display module, so as to solve the problem that the brightness is lower than the second area due to the low aperture ratio of the first area.
The embodiment of the application provides a backlight module, which has a first area and a second area, the backlight module includes: a backlight source; the reflecting film is arranged corresponding to the backlight source and comprises a first reflecting film and a second reflecting film, the first reflecting film is positioned in the first area, and the second reflecting film is positioned in the second area; the reflectivity of the first reflecting film is larger than that of the second reflecting film, so that the backlight brightness of the first area is larger than that of the second area.
Optionally, in some embodiments of the present application, a ratio between reflectivities of the second reflective film and the first reflective film is between 0.8 and 1.
Optionally, in some embodiments of the present application, the material of the first reflective film comprises an enhanced specular reflective film, a metallic reflective film; the material of the second reflecting film comprises a metal reflecting film and a white plastic reflecting film.
Optionally, in some embodiments of the present application, the reflective film has a thickness between 0.01um and 0.1um, and the thickness of the first reflective film is greater than or equal to the thickness of the second reflective film.
Optionally, in some embodiments of the present application, a ratio of a thickness of the reflective film to a height of the backlight source is between 0.3 and 0.5.
Optionally, in some embodiments of the present application, the backlight includes a side-in type backlight and a direct-out type backlight.
Optionally, in some embodiments of the present application, when the backlight source is a side-in type backlight source, the backlight module further includes: the light guide plate is arranged on the light emergent side of the backlight source and correspondingly arranged on one side of the reflecting film for reflecting light; wherein the backlight is disposed proximate the first region.
Optionally, in some embodiments of the present application, when the backlight source is a direct-type backlight source, the backlight module further includes: the diffusion film is arranged on the light-emitting side of the backlight source and correspondingly arranged on one side of the reflection film for reflecting light; the brightness enhancement film is arranged on one side of the diffusion film, which is far away from the reflecting film; the backlight source comprises a first backlight source and a second backlight source, the first backlight source is located in the first area, the second backlight source is located in the second area, and the brightness of the first backlight source is greater than that of the second backlight source.
Optionally, in some embodiments of the present application, the backlight module further includes: and the reflection type polarizer is arranged on one side of the brightness enhancement film, which is far away from the diffusion film, and is at least positioned in the first area.
Correspondingly, the embodiment of the application also provides a display module, which comprises the backlight module and a display panel arranged on the backlight module, wherein the display panel is provided with a fingerprint identification area and a non-fingerprint identification area, the fingerprint identification area is arranged corresponding to the first area, and the non-fingerprint identification area is arranged corresponding to the second area; wherein the display panel includes: the array substrate is arranged on the light emitting side of the backlight module; the color film substrate is arranged opposite to the array substrate and is positioned on one side of the array substrate, which is far away from the backlight module; and the liquid crystal layer is arranged between the array substrate and the color film substrate.
To sum up, this application embodiment provides a backlight unit, through first district set up than the reflectivity is higher in the second district the reflectance coating, can with the utilization ratio in a poor light of first district improves to improve the luminance in a poor light of first district, improve because the aperture ratio of first district is low the luminance that causes is less than the problem in second district, realize first district with the luminance uniformity in second district improves user's visual experience.
Secondly, the brightness of the first backlight source is greater than that of the second backlight source, and the brightness of the first area and the second area is controlled by directly setting initial backlight brightness; then, the light scattering property of the diffusion film in the first region is lower than that of the diffusion film in the second region, that is, the backlight utilization rate is improved by controlling the attenuation rate of the backlight; and finally, the reflective polarizer is arranged in the first area, so that the backlight brightness of the first area is improved, the problem that the brightness is lower than that of the second area due to the low aperture opening ratio of the first area is solved, the display brightness difference between the first area and the second area is reduced, and the visual experience of a user is further improved.
Drawings
Fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present application;
FIG. 2 is a first schematic cross-sectional view illustrating a backlight module according to an embodiment of the present disclosure;
FIG. 3 is a schematic cross-sectional view of a second exemplary embodiment of a backlight module;
FIG. 4 is a schematic cross-sectional view illustrating a third exemplary embodiment of a backlight module according to the present disclosure;
fig. 5 is a schematic structural diagram of the display module in the embodiment of the present application.
Description of the main reference numerals:
Figure BDA0003437161940000031
Figure BDA0003437161940000041
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise stated, the use of directional terms such as "upper", "lower", "left" and "right" may refer to the actual use or operation of the device, may refer to the drawing direction in the drawings, and may refer to two opposite directions; while "inner" and "outer" are with respect to the outline of the device.
Referring to fig. 1 to 4, in particular, an embodiment of the present invention provides a backlight module 100 having a first region 101 and a second region 102, where the backlight module 100 includes: a backlight source 110, wherein the backlight source 110 includes a side-in type backlight source and a direct type backlight source; a reflective film 120, disposed corresponding to the backlight source 110, extending from the first area 101 to the second area 102, for reflecting light emitted from the backlight source 110 to a light-emitting side, including a first reflective film 121 and a second reflective film 122, where the first reflective film 121 is located in the first area 101, and the second reflective film 122 is located in the second area 102; wherein the reflectivity of the first reflective film 121 is greater than the reflectivity of the second reflective film 122, so that the backlight brightness of the first region 101 is greater than the backlight brightness of the second region 102. The first region 101 may be configured with more devices such as thin film transistors, for example: a photosensor, etc., thereby causing a decrease in the aperture ratio of the first region 101, and when the backlight luminance provided by the backlight 110 is constant, by providing the reflective film 120 having a higher reflectance than that of the second region 102 in the first region 101, the backlight utilization rate of the first region 101 can be increased, thereby increasing the backlight luminance of the first region 101, thereby improving the problem that the luminance is lower than that of the second region 102 due to the low aperture ratio of the first region 101.
The reflective film 120 can reflect the light emitted thereto and emit the light again, thereby increasing the utilization rate of the light. The first reflective film 121 and the second reflective film 122 may be integrally formed by using the same material in the same process, or may be formed by splicing different materials, as long as the requirement that the reflectivity of the first reflective film 121 is greater than that of the second reflective film 122 in the present application is satisfied. Preferably, the ratio of the reflectivities of the second reflective film 122 and the first reflective film 121 is between 0.8 and 1. With this arrangement, by adjusting the ratio of the reflectance between the second reflection film 122 and the first reflection film 121, the brightness of the light reflected by the second reflection film 122 and the first reflection film 121 can be accurately controlled. In addition, a seam line can be arranged at the joint between the first reflective film 121 and the second reflective film 122, and the reflective film 120 with the seam line at the joint can release the elastic resilience stress to a greater extent, so that the reflective film 120 can be better attached, and the brightness difference between the first area 101 and the second area 102 is reduced, thereby further improving the user experience.
In the present application, the brightness of the grain identification area 101 is increased by providing the reflective film 120 having a higher reflectance than that of the second area 102 in the first area 101. The material of the first reflective film 121 includes an enhanced specular reflective film and a metal reflective film. The material of the second reflective film 122 includes a metal reflective film and a white plastic reflective film.
Enhanced specular reflection film (ESR film) is a film that integrates 1000 layers of thin film in a thickness of 100 microns or more, using multilayer film technology. The ESR film does not contain a little metal, is a multilayer film structure made of PET resin as a raw material, is a green environment-friendly reflecting material, utilizes the birefringence characteristic of polymers and precisely controls the thickness of the film, and can uniformly reflect optical fibers in visible light wavelength, so that the ESR film has high reflectivity and no dry color or light and shade color cast. As a high efficiency reflective film, ESR film has a reflectance of 98% or more over the entire visible spectrum, which is higher than other types of reflective films. The metal reflecting film has relatively large extinction coefficient, when light beam is incident to the metal surface from air, the light amplitude entering the metal is quickly attenuated, so that the light energy entering the metal is correspondingly reduced, and the reflected light energy is increased. For a white plastic reflective film, light rays are scattered on the surface, and meanwhile, a part of light rays are refracted to enter a film medium, and due to a large amount of fillers and/or micro bubbles in the film, the light rays can be reflected, refracted and re-reflected when encountering the foreign matters, particularly the light rays with the refractive index of 1.0 of the medium in the micro bubbles can be reflected on the inner surface of the micro bubbles and refracted at a larger angle.
Preferably, the first reflective film 121 in this application employs a 3M ESR film; the second reflective film 122 is a white plastic reflective film. The 3M ESR film has a metal total reflection effect, is not made of any metal material, has high reflection surfaces on both surfaces, has a plastic protective film on both surfaces to protect the mirror surface from contamination, is a very uniform smooth surface with a very high reflectivity, has no damage such as a pipe folding mark or a wrinkle on the reflection surface, and can greatly improve the backlight brightness of the backlight module 100. At this time, the second reflective film 122 is made of a white plastic reflective film, which on one hand, plays a role of reflecting light, and on the other hand, can blur the boundary feeling of the film layers after the first reflective film 121 and the second reflective film 122 reflect light, so that the backlight is uniform, and the backlight effect of the backlight module 100 is improved.
In the present application, the thickness of the reflective film 120 is between 0.01um and 0.1um, and the thickness of the first reflective film 121 is greater than or equal to the thickness of the second reflective film 122. Preferably, the thickness of the first reflective film 121 is between 0.03 um and 0.05um, and the thickness of the second reflective film 122 is between 0.02 um and 0.05 um. The thickness of the reflective film 120 should not be higher than the height of the backlight 110 so as to avoid blocking the light emitted from the backlight 110, and preferably, the ratio between the thickness of the reflective film 120 and the height of the backlight 110 is between 0.3 and 0.5.
The first embodiment is as follows:
as shown in fig. 2, the backlight 110 is a side-in type backlight, and the backlight 110 is preferably an LED backlight. The backlight module 100 further includes: a light guide plate 130 disposed on the light exit side of the backlight 110 and corresponding to the side of the reflective film 120 that reflects light; wherein the backlight 110 is disposed proximate to the first region 101. For a side-in type backlight source with a smaller size, such as a backlight source behind a mobile phone liquid crystal display, a side-by-side lamp is generally adopted to reduce the number of light sources, so as to obtain smaller space occupation. Meanwhile, reducing the number of LEDs can also achieve a higher power consumption ratio, which is beneficial to reducing the power consumption of the backlight source, that is, the backlight source 110 is disposed on a side surface close to the first region 101. As shown in fig. 3, for a large-sized backlight source, such as a liquid crystal television or an advertising light box, the light source is usually arranged on one, two, or even three, or four sides of the backlight source, because the uniformity problem of the large-sized panel and the overall brightness problem of the backlight source are considered, and since these applications are all external power sources, the sensitivity to energy consumption is not high for the mobile device. At this time, the brightness of the backlight 110 on the side close to the first region 101 may be increased, that is, the brightness of the backlight 110 on the side close to the first region 101 is greater than the brightness of the backlight 110 on the side far from the first region 101, which can further increase the backlight brightness of the first region 101, thereby reducing the display brightness difference between the first region 101 and the second region 102, and improving the user experience.
In summary, in the present embodiment, on one hand, by providing the reflective film 120 with a higher reflectivity than that of the second region 102 in the first region 101, the backlight utilization rate of the first region 101 can be improved, so as to improve the backlight brightness of the first region 101; on the other hand, the backlight source 110 is disposed on at least one side of the backlight module 100, which can increase the brightness of the backlight source 110 on the side close to the first region 101, that is, the brightness of the backlight source 110 on the side close to the first region 101 is greater than the brightness of the backlight source 110 on the side far from the first region 101; by means of the arrangement, the brightness of the first area 101 can be improved from two dimensions of backlight utilization rate and backlight brightness, the problem that the brightness is lower than that of the second area 102 due to the fact that the aperture opening ratio of the first area 101 is low is solved, the display brightness difference between the first area 101 and the second area 102 is reduced, and user experience is improved.
Example two:
as shown in fig. 4, the backlight 110 is a direct-type backlight, and the backlight 110 is preferably an LED backlight. The backlight module 100 further includes: a diffusion film 140 disposed on the light-emitting side of the backlight 110 and correspondingly disposed on the side of the reflection film 110 reflecting light; a brightness enhancement film 150 disposed on a side of the diffuser film 140 away from the reflective film 110; the backlight source 110 includes a first backlight source 111 and a second backlight source 112, the first backlight source 111 is located in the first region 101, the second backlight source 112 is located in the second region 102, and the luminance of the first backlight source 111 is greater than the luminance of the second backlight source 112.
In the present embodiment, the diffusion film 140 mainly plays a role of correcting a diffusion angle in the backlight structure, so that a light radiation area is increased. After the light emitted from the backlight source 110 is diffused by the diffusion film 140, the light can become a secondary light source with a larger area, better uniformity and stable chromaticity. The diffusion film 140 has a function of diffusing light, that is, light is scattered on the surface thereof, so that the light is diffused softly and uniformly, the directivity of light emitted from the light guide plate 130 is reduced, and defects of optical quality such as scratch and black spot of an optical film possibly existing on the display surface are blurred. Preferably, the light scattering property of the diffuser film 140 located in the first region 101 is lower than that of the diffuser film 140 located in the second region 102. Since the lower the light scattering property of the diffusion film 140 in the first region 101, the higher the light transmittance, the lower the light attenuation and the higher the backlight brightness when the light emitted from the backlight 110 passes through the diffusion film 140. The arrangement can solve the problem that the brightness is lower than that of the second area 102 due to the low aperture ratio of the first area 101, further reduce the display brightness difference between the first area 101 and the second area 102, and improve the user experience. The brightness enhancement film 150 is disposed on a side of the diffusion film 140 away from the reflective film 110 to achieve the purpose of regulating light again and increasing brightness. Preferably, the brightness enhancement film 150 comprises a Multi-Functional Prism Sheet (Multi-Functional Prism Sheet).
Further, in the present embodiment, the backlight module 100 further includes a reflective polarizer 160 (DBEF) disposed on a side of the Brightness Enhancement Film 150 away from the diffuser Film 140 and at least located in the first region 101. Preferably, the reflective polarizer 160 is located in the first region 101. The DBEF is a multilayer composite film that allows polarized light in one direction to pass through, reflects polarized light in the direction perpendicular to the one direction back into the backlight system, is depolarized by a series of reflections and refractions, and then passes through the DBEF again, and so on, and theoretically almost all light can be used. In this embodiment, the DBEF is disposed on the outermost layer of the backlight module 100, so as to improve the backlight brightness to the maximum.
In summary, in the present embodiment, first, the reflective film 120 with a higher reflectivity than that of the second region 102 is disposed in the first region 101, so that the backlight utilization rate of the first region 101 can be improved; secondly, the brightness of the first backlight source 111 is greater than that of the second backlight source 112, and the brightness of the first area 101 and the second area is controlled by directly setting the initial backlight brightness; then, the light scattering property of the diffusion film 140 located in the first region 101 is lower than that of the diffusion film 140 located in the second region 102, that is, the backlight utilization rate is increased by controlling the attenuation rate of the backlight; finally, the reflective polarizer 160 is disposed in the first region 101, so as to improve the backlight brightness of the first region 101, and solve the problem that the brightness of the first region 101 is lower than that of the second region 102 due to the low aperture ratio, thereby reducing the display brightness difference between the first region 101 and the second region 102 and improving the user experience. That is to say, in the embodiment, the backlight source 110, the reflective film 120, the diffusion film 140, the reflective polarizer 160, and the like are improved, so that the problem that the aperture ratio of the first region 101 is reduced and the brightness of the display module is uneven due to more devices such as thin film transistors arranged in the first region 101 is reduced. The backlight source 110, the reflective film 120, the diffusion film 140, and the reflective polarizer 160 may be modified simultaneously, or only partially, and the application is not limited thereto.
Referring to fig. 5, in particular, an embodiment of the present invention further provides a display module 10, including the backlight module 100 in the above embodiment and a display panel 200 disposed on the backlight module 100, where the display panel 200 has a fingerprint identification area 201 and a non-fingerprint identification area 202, the fingerprint identification area 201 is disposed corresponding to the first area 101, and the non-fingerprint identification area 202 is disposed corresponding to the second area 102; wherein; the display panel 200 includes: an array substrate 210 disposed on a light emitting side of the backlight module 100; the color film substrate 220 is arranged opposite to the array substrate 210 and is located on one side of the array substrate 210 away from the backlight module 100; the liquid crystal layer 230 is disposed between the array substrate 210 and the color film substrate 220. The array substrate 210, the color filter substrate 220, and the liquid crystal layer 230 may be conventional structures in the art, and the present application is not limited thereto. The display module 10 can be applied to any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display module 10 should be understood by those skilled in the art, and are not described herein nor should they be considered as limiting the present application. The implementation of the display module 10 can refer to the above-mentioned embodiment of the backlight module 100, and repeated descriptions are omitted.
As can be seen from the foregoing embodiments, in the backlight module 100 provided in the present application, by providing the reflective film 120 with a higher reflectivity than that of the second area 102 in the first area 101, the backlight utilization rate of the first area 101 can be increased, so as to increase the backlight luminance of the first area 101, improve the problem that the luminance is lower than that of the second area 102 due to the low aperture ratio of the first area 101, achieve uniform luminance of the first area 101 and the second area 102, and improve the visual experience of a user.
Secondly, the brightness of the first backlight source 111 is greater than that of the second backlight source 112, and the brightness of the first area 101 and the second area is controlled by directly setting the initial backlight brightness; then, the light scattering property of the diffusion film 140 located in the first region 101 is lower than that of the diffusion film 140 located in the second region 102, that is, the backlight utilization rate is increased by controlling the attenuation rate of the backlight; finally, the reflective polarizer 160 is disposed in the first region 101, so as to improve the backlight brightness of the first region 101, and improve the problem that the brightness of the first region 101 is lower than that of the second region 102 due to the low aperture ratio, thereby reducing the display brightness difference between the first region 101 and the second region 102, and further improving the visual experience of the user.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The technical solutions provided by the embodiments of the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the embodiments are only used to help understanding the method and the core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A backlight module having a first region and a second region, the backlight module comprising:
a backlight source;
the reflecting film comprises a first reflecting film and a second reflecting film, the first reflecting film is positioned in the first area, and the second reflecting film is positioned in the second area; wherein
The reflectivity of the first reflection film is larger than that of the second reflection film, so that the backlight brightness of the first area is larger than that of the second area.
2. The backlight module as claimed in claim 1, wherein the ratio of the reflectivities of the second reflective film and the first reflective film is between 0.8 and 1.
3. The backlight module as claimed in claim 1, wherein the first reflective film is made of an enhanced specular reflective film, a metal reflective film; the material of the second reflecting film comprises a metal reflecting film and a white plastic reflecting film.
4. The backlight module as claimed in claim 1, wherein the reflective film has a thickness of 0.01um to 0.1um, and the first reflective film has a thickness greater than or equal to that of the second reflective film.
5. The backlight module as claimed in claim 1, wherein the ratio of the thickness of the reflective film to the height of the backlight source is between 0.3 and 0.5.
6. The backlight module as claimed in claim 1, wherein the backlight source comprises a side-in type backlight source and a direct-out type backlight source.
7. The backlight module of claim 6, wherein when the backlight source is a side-in type backlight source, the backlight module further comprises:
the light guide plate is arranged on the light emergent side of the backlight source and correspondingly arranged on one side of the reflecting film for reflecting light; wherein
The backlight is disposed proximate the first region.
8. The backlight module as claimed in claim 6, wherein when the backlight source is a direct-type backlight source, the backlight module further comprises:
the diffusion film is arranged on the light-emitting side of the backlight source and correspondingly arranged on one side of the reflection film for reflecting light;
the brightness enhancement film is arranged on one side of the diffusion film, which is far away from the reflecting film; wherein
The backlight source comprises a first backlight source and a second backlight source, the first backlight source is located in the first area, the second backlight source is located in the second area, and the brightness of the first backlight source is greater than that of the second backlight source.
9. The backlight module of claim 8, wherein the backlight module further comprises:
and the reflection type polarizer is arranged on one side of the brightness enhancement film, which is far away from the diffusion film, and is at least positioned in the first area.
10. A display module comprising the backlight module according to any one of claims 1 to 9 and a display panel disposed on the backlight module, wherein the display panel has a fingerprint identification area and a non-fingerprint identification area, the fingerprint identification area is disposed corresponding to the first area, and the non-fingerprint identification area is disposed corresponding to the second area; wherein
The display panel includes:
the array substrate is arranged on the light emitting side of the backlight module;
the color film substrate is arranged opposite to the array substrate and is positioned on one side of the array substrate, which is far away from the backlight module;
and the liquid crystal layer is arranged between the array substrate and the color film substrate.
CN202111618208.6A 2021-12-27 2021-12-27 Backlight module and display module Pending CN114355668A (en)

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Application Number Priority Date Filing Date Title
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