CN112596301A - Backlight module and display device - Google Patents
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- CN112596301A CN112596301A CN202011498497.6A CN202011498497A CN112596301A CN 112596301 A CN112596301 A CN 112596301A CN 202011498497 A CN202011498497 A CN 202011498497A CN 112596301 A CN112596301 A CN 112596301A
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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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
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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
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- 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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention provides a backlight module and a display device. The backlight module comprises a first light source and a collimation component, wherein the collimation component is positioned on one side of the first light source close to the light-emitting side of the backlight module. The collimating component comprises a plurality of collimating bodies arranged at intervals, at least a first gap extending along a first direction and a second gap extending along a second direction are formed between every two adjacent collimating bodies, and the first gap and the second gap are used for guiding out light rays emitted by the first light source. The first direction intersects the second direction. According to the invention, through the arrangement of the collimation component, the light from the light source is led out from the first gap and the second gap, and the light emission of the light from the light source is converged in two directions, so that the dispersion degree of the light emission of the backlight module is reduced, and the accuracy of the display device for acquiring the target signal through the signal receiving component is improved.
Description
Technical Field
The invention relates to the field of display, in particular to a backlight module and a display device.
Background
In the conventional display device, to achieve the effect of a full screen or an approximately full screen, a signal receiving means, for example: the fingerprint detection sensor is integrated in the display panel, and for a non-self-luminous display screen, the signal receiving component integrated in the display panel needs the backlight module to provide a target signal for light to generate response.
When the existing backlight module emits light towards the side of the display panel, the range of the light-emitting angle is 0-180 degrees, the light-emitting angle is too dispersed, so that the target signal received by the signal receiving component (such as a fingerprint detection sensor) is less, and the display device is difficult to acquire target information (such as fingerprint imaging information).
Therefore, a backlight module and a display device are needed to solve the above technical problems.
Disclosure of Invention
The invention provides a backlight module and a display device, which are used for solving the problem that the display device is difficult to acquire target information due to the fact that the light-emitting angle of the backlight module is too dispersed.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the invention provides a backlight module, which comprises a first light source and a collimating component, wherein the collimating component is positioned on one side of the first light source, which is close to the light-emitting side of the backlight module;
the collimating component comprises a plurality of collimating bodies arranged at intervals, at least a first gap extending along a first direction and a second gap extending along a second direction are formed between every two adjacent collimating bodies, and the first gap and the second gap are used for guiding out light rays emitted by the first light source;
the first direction intersects the second direction.
In the backlight module provided by the invention, the collimating body comprises a first light absorbing layer.
In the backlight module provided by the invention, the collimating body comprises a first reflecting layer, the first reflecting layer is positioned on one side of the collimating body far away from the light-emitting side of the backlight module, and/or the first reflecting layer is positioned on one side of the collimating body close to the light-emitting side of the backlight module.
In the backlight module provided by the invention, the collimating component further comprises a first substrate, and the collimating body is positioned on one side of the first substrate, which is far away from the light-emitting side of the backlight module; or,
the collimator is positioned on one side of the first substrate close to the light-emitting side of the backlight module.
In the backlight module provided by the invention, the shape of the collimating body is a cylinder or a trapezoidal column.
In the backlight module provided by the invention, the backlight module further comprises a diffusion layer positioned on one side of the light-emitting side of the collimation member, which is far away from the backlight module, a light guide layer positioned on one side of the diffusion layer, which is far away from the collimation member, and a reflection layer positioned on one side of the light guide layer, which is far away from the collimation member, wherein the first light source is positioned between the reflection layer and the diffusion layer.
The invention also provides a display device, which comprises the backlight module, the display panel on the light-emitting side of the backlight module and a signal receiving component.
In the display device provided by the invention, the display device comprises a signal receiving area, the signal receiving component is positioned in the signal receiving area, and the distribution density of the collimating bodies positioned in the signal receiving area is greater than that of the collimating bodies positioned outside the signal receiving area; or,
the spacing between the collimating bodies located within the signal receiving area is less than the spacing of the collimating bodies located outside the signal receiving area.
In the display device provided by the invention, the backlight module further comprises a second light source, and the second light source is positioned between the light guide layer and the reflecting layer of the backlight module in the signal receiving area.
In the display device provided by the invention, the first direction is parallel to the extending direction of the scanning lines of the display panel, and the second direction is parallel to the extending direction of the data lines of the display panel.
Has the advantages that: according to the invention, through the arrangement of the collimation component, the light from the light source is led out from the first gap and the second gap, and the light emission of the light from the light source is converged in two directions, so that the dispersion degree of the light emission of the backlight module is reduced, and the accuracy of the display device for acquiring the target signal through the signal receiving component is improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a first structural schematic diagram of a backlight module according to the present invention.
FIG. 2 is a second structural diagram of the backlight module according to the present invention.
FIG. 3 is a third structural diagram of the backlight module of the present invention.
FIG. 4 is a fourth structural diagram of the backlight module of the present invention.
FIG. 5 is a schematic view of a fifth structure of the backlight module of the present invention.
FIG. 6 is a schematic view of a sixth structure of the backlight module of the present invention.
FIG. 7 is a first structural schematic of the collimating component of the present invention.
Fig. 8 is a first structural diagram of a display device according to the present invention.
Fig. 9 is a second structural diagram of the display device of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
The existing display device has the problem that the display device is difficult to acquire a target signal through a signal receiving component because the light-emitting angle of the backlight module is too dispersed. Based on this, the invention provides a backlight module and a display device.
Referring to fig. 1 to 7, the backlight module 100 includes a first light source 103 and a collimating member 105, wherein the collimating member 105 is located at a side of the first light source 103 close to a light emitting side of the backlight module 100.
The collimating component 105 includes a plurality of collimating bodies 106 arranged at intervals, and at least a first gap extending along a first direction and a second gap extending along a second direction are formed between adjacent collimating bodies 106, and the first gap and the second gap are used for guiding out light rays emitted by the first light source 103.
The first direction intersects the second direction.
According to the invention, through the arrangement of the collimating component 105, the light from the light source of the backlight module 100 is led out from the first gap and the second gap, and the light outgoing from the light of the backlight module 100 is converged in two directions, so that the dispersion degree of the light outgoing from the backlight module 100 is reduced, and the accuracy of the display device for acquiring a target signal through the signal receiving component is improved.
The technical solution of the present invention will now be described with reference to specific embodiments.
Example one
Referring to fig. 1 to 7, in the embodiment, the collimating body 106 includes a first light absorbing layer 108, and light from the first light source 103 is absorbed by the first light absorbing layer 108 and then guided out of the first gap and the second gap.
The collimating body 106 may be formed of only the first light absorbing layer 108, the first light absorbing layer 108 may be made of a black light absorbing material, when the light from the first light source 103 reaches the collimating member 105, the light irradiated to the first light absorbing layer 108 is absorbed, and the light not irradiated to the first light absorbing layer 108 is guided out from the first gap and the second gap, so that the outgoing light is converged in two directions, and the dispersion degree of the outgoing light is reduced.
The material of the first light absorbing layer 108 may be black light absorbing material, such as black PC (Polycarbonate) material.
In this embodiment, the backlight module 100 may further include a diffusion layer 104 located on a side of the collimating member 105 away from the light exit side of the backlight module 100, a light guide layer 101 located on a side of the diffusion layer 104 away from the collimating member, and a reflection layer 102 located on a side of the light guide layer 101 away from the collimating member 105, wherein the first light source 103 is located between the reflection layer 102 and the diffusion layer 104. The first light source 103 may be a side-entry light source or a direct-exit light source.
Referring to fig. 3 and fig. 4, in the present embodiment, the collimating body 106 includes a first reflective layer 109, and the light from the first light source 103 is reflected by the first reflective layer 109 and then led out from the first gap or the second gap.
In this embodiment, the first reflective layer 109 is located on a side of the collimating body 106 away from the light emitting side of the backlight module 100, and/or the first reflective layer 109 is located on a side of the collimating body 106 close to the light emitting side of the backlight module 100.
That is, in this embodiment, the first light reflecting layer 109 may be located on a side of the collimating body 106 close to the diffusion layer 104, and/or the first light reflecting layer 109 may be located on a side of the collimating body 106 far from the diffusion layer 104.
The collimating body 106 may consist of the first light reflecting layer 109 only, or the first light reflecting layer 109 may cover the surface of other structures of the collimating body 106 (e.g. the first light absorbing layer 108).
In this embodiment, the collimating member 105 further includes a first substrate 107, and the collimating body 106 is located on a side of the first substrate 107 away from the light-emitting side of the backlight module 100.
Alternatively, the collimating body 106 is located on a side of the first substrate 107 close to the light exit side of the backlight module 100.
That is, in this embodiment, the collimating body 106 may be located on a side of the first substrate 107 close to the diffusion layer 104.
Alternatively, the collimating body 106 may be located on a side of the first substrate 107 remote from the diffusion layer 104.
The collimating body 106 may be formed by means of nanoimprinting. The material of the first substrate 107 may be selected to be a material that is favorable for light transmission, such as a PET (Polyethylene terephthalate) material.
In this embodiment, the collimating body 106 comprises a first side near a side of the first substrate 107, a second side far from the side of the first substrate 107, and a third side connecting the first side and the second side.
When the collimating body 106 is located on the side of the first substrate 107 close to the diffusion layer 104, the first light reflecting layer 109 may be located on the side of the collimating body 106 close to the diffusion layer 104.
The first light reflecting layer 109 may be located at the second side and/or the third side.
At this time, when the light beam of the first light source 103 reaches the collimating member 105, the light beam irradiated to the first light reflecting layer 109 is reflected back to the diffusing layer 104, and then a part of the light beam is emitted again to the collimating member 105 by the action of the diffusing layer 104, and can be led out from the first gap or the second gap; the light irradiated to the first gap or the second gap is directly guided out from the first gap or the second gap, and the arrangement of the first reflective layer 109 is beneficial to improving the light utilization rate of the backlight module 100.
Meanwhile, when the first light reflecting layer 109 is located on the third side or when the first light reflecting layer 109 is located on the second side and the third side, part of the light rays irradiated to the first light reflecting layer 109 on the third side can be directly led out from the first gap or the second gap through the reflection of the first light reflecting layer 109, so that the total amount of the light rays emitted from the backlight module 100 is increased; in addition, the light irradiated onto the third side surface can be converged again by the reflection of the first reflective layer 109, so that the light utilization rate of the backlight module 100 is improved, and the light convergence effect is further improved.
When the collimating body 106 is located at the side of the first substrate 107 remote from the diffusion layer 104, the first light reflecting layer 109 may be located at the first side and/or the third side.
Similarly, when the first light reflecting layer 109 is located on the first side, after the light from the first light source 103 reaches the collimating member 105 and the light irradiated to the first light reflecting layer 109 is reflected back to the diffusing layer 104, a part of the light may be guided out from the first gap or the second gap when the light is emitted again to the collimating member 105 by the action of the diffusing layer 104; the light irradiated to the first gap or the second gap is directly guided out from the first gap or the second gap, and the arrangement of the first reflective layer 109 is beneficial to improving the light utilization rate of the backlight module 100.
When the first light reflecting layer 109 is located on the third side, the collimating body 106 may be composed of the first light absorbing layer 108 and the first light reflecting layer 109, and when the light from the first light source 103 irradiates the first light reflecting layer 109 on the third side, part of the light is reflected back to the diffusion layer 104 and finally led out from the first gap or the second gap through the action of the diffusion layer 104; part of the light rays can be converged again through the first reflective layer 109, so that the light ray utilization rate of the backlight module 100 is improved, and meanwhile, the light ray convergence effect is further improved.
Referring to fig. 5 and fig. 6, in the present embodiment, the first substrate 107 includes a plurality of first brightness enhancing units 110, and the light from the first light source 103 is converged by the first brightness enhancing units 110 and then guided out of the first gap and the second gap.
In this embodiment, the first brightness enhancing unit 110 may be disposed corresponding to the first gap and the second gap, and the first brightness enhancing unit 110 may be a dot or a prism.
In this embodiment, when the first brightness enhancing unit 110 is a prism, and the collimating body 106 is located on the side of the first substrate 107 close to the diffusing layer 104, the prism may be formed by protruding from the side of the first substrate 107 far from the diffusing layer 104 to the direction far from the diffusing layer 104. At this time, the prism may be disposed corresponding to the first gap and the second gap, and at this time, the light from the first light source 103 is converged by the collimating body 106 and then converged by the prism again, which is beneficial to increase the total amount of light guided out from the first gap and the second gap, improve the converging effect of the collimating member 105 on the light of the first light source 103, and reduce the divergence degree of the emergent light of the backlight module 100.
When the collimating body 106 is located on the side of the first substrate 107 away from the diffusion layer 104, the prisms may be arranged in a full-layer and continuous manner, and in this case, the prisms include a first sub-prism arranged corresponding to the first gap and the second gap and a second sub-prism arranged corresponding to the collimating body 106. The first sub-prisms are used for refracting part of light rays irradiated on the first sub-prisms to the first gaps or the second gaps and leading out the light rays from the first gaps or the second gaps; the second sub-prism is configured to converge the light irradiated to the second sub-prism, and the light converged by the second sub-prism passes through the first gap and the second gap, so as to improve the light converging effect of the collimating component 105 on the light of the first light source 103 and reduce the divergence degree of the emergent light of the backlight module 100.
The prisms corresponding to the first gap may extend in the first direction, and the prisms corresponding to the second gap may extend in the second direction, which is beneficial to improve the efficiency of the collimating member 105 in converging the light of the backlight module 100 for multiple times, improve the converging effect of the collimating member 105 on the light of the first light source 103, and reduce the divergence degree of the emergent light of the backlight module 100.
In this embodiment, the first brightness enhancement unit 110 is a dot, and when the dot is disposed corresponding to the first gap and the second gap, the depth of the dot is smaller than the thickness of the first substrate 107, so that the dot is disposed to increase the total amount of light guided out from the first gap and the second gap, thereby improving the light utilization rate of the backlight module 100.
In this embodiment, the first brightness enhancing unit 110 may be symmetrically disposed about a first axis of symmetry of the first gap in the first direction, and/or the first brightness enhancing unit 110 may be symmetrically disposed about a second axis of symmetry of the second gap in the second direction. Due to the symmetrical arrangement of the first brightness enhancing unit 110 about the first symmetry axis and/or the second symmetry axis, the light rays guided out of the first gap and/or the second gap are uniformly distributed, and the display effect of the display device using the backlight module 100 is improved.
In this embodiment, the first brightness enhancing unit 110 may be formed by an embossing process.
In this embodiment, when the first direction is perpendicular to the second direction, the collimating component 105 has the best convergence effect on the light from the first light source 103 in two directions, which is beneficial to reducing the dispersion degree of the light emitted from the first light source 103 to the display panel to the greatest extent.
In this embodiment, by the arrangement of the collimating component 105, the light from the light source of the backlight module 100 is guided out from the first gap and the second gap, and the light emitted from the light source of the backlight module 100 is converged in two directions, so that the dispersion degree of the light emitted from the backlight module 100 is reduced, and the accuracy of the display device for acquiring the target signal through the signal receiving component is improved.
In the above embodiment, the shape of the collimating body 106 may be a three-dimensional shape such as a cylinder, a circular truncated cone, an elliptic cylinder, a trapezoidal cylinder (frustum of a prism), a rectangular parallelepiped, or a cube. When the collimating body 106 is a cuboid or a cube, since the third side of the collimating body 106 is perpendicular to the first substrate 107, the plane where the light from the first light source 103 is collimated is the best, and the first side and the second side of the collimating body 106 are both rectangular or square, which is beneficial to the collimating body 106 to optimize the convergence effect of the light from the first light source 103 in two mutually perpendicular directions. Referring to fig. 7, when the collimating body 106 is a trapezoidal column, the first side surface may be square or rectangular, the second side surface may be square or rectangular, and the area of the first side surface is larger than that of the second side surface, which is beneficial for the collimating body 106 to achieve the best convergence effect on the light from the first light source 103 in two mutually perpendicular directions, and because the area of the first side surface is larger than that of the second side surface, the mold release is easy in the manufacturing process, and the processing and molding are convenient.
Referring to fig. 1 to 9, the present invention further provides a display device 118, which includes the backlight module 100, and a display panel 111 and a signal receiving member 112 located at a light emitting side of the backlight module 100.
According to the display device 118 provided by the invention, through the arrangement of the collimating component 105, the light from the light source of the backlight module 100 is led out from the first gap and the second gap, and the light outgoing from the light source of the backlight module 100 is converged in two directions, so that the dispersion degree of the light outgoing from the backlight module 100 is reduced, and the accuracy of the display device 118 for acquiring a target signal through a signal receiving component is improved.
The technical solution of the present invention will now be described with reference to specific embodiments.
Example two
Referring to fig. 1 to 9, in the present embodiment, the display device 118 includes a signal receiving area, the signal receiving component 112 is located in the signal receiving area, and the distribution density of the collimating bodies 106 located in the signal receiving area is greater than the distribution density of the collimating bodies 106 located outside the signal receiving area.
Alternatively, the spacing between the collimating bodies 106 located within the signal receiving area is smaller than the spacing of the collimating bodies 106 located outside the signal receiving area.
In this embodiment, the display device 118 further comprises a signal receiving member 112 located within the signal receiving area. The display panel 111 may be a liquid crystal display panel or other non-self-luminous display panel. The display panel 111 may include an array substrate 113 and a second substrate disposed opposite to the array substrate 113, where the second substrate may be a color filter substrate or another substrate disposed opposite to the array substrate 113. When the display panel 111 is a liquid crystal display panel, the display panel 111 further includes a liquid crystal layer 114 between the array substrate 113 and the second substrate. When the second substrate is a color film substrate, the second substrate may include a cover plate layer 115 and a color film layer 116 located on one side of the cover plate layer 115 close to the array substrate 113. The signal receiving member 112 may be located on the array substrate 113, or may be located on the second substrate, and the signal receiving member 112 may be located on a side of the array substrate 113 close to the second substrate, or the signal receiving member 112 may be located on a side of the second substrate close to the array substrate 113. The signal receiving component 112 is used for receiving a target signal, and the display device 118 obtains target information through the target signal acquired by the signal receiving component 112.
Referring to fig. 8, for example, the signal receiving component 112 may be a biometric sensor for fingerprint identification, when the display device 118 performs fingerprint identification, light from the backlight module 100 is irradiated onto a fingerprint to be identified, and a target light signal generated by reflection of the fingerprint reaches the fingerprint sensor, so that the display device 118 obtains corresponding fingerprint information and performs fingerprint identification. In the backlight module 100 provided by the invention, the light from the light source of the backlight module 100 is led out from the first gap extending along the first direction and the second gap extending along the second direction through the arrangement of the collimating component 105, and the light emitted from the light source 103 is converged in two directions, so that the light irradiated on the fingerprint to be identified is not excessively dispersed, and the identification rate of the display device 118 on the fingerprint is improved.
In this embodiment, the angular range of the exit angles of the light rays derived from the first gap and the second gap may be controlled by controlling the spacing between the collimating bodies 106 or the distribution density of the collimating bodies 106. When the distance between the collimating bodies 106 is smaller or the distribution density of the collimating bodies 106 is larger, the collimating bodies 106 have better convergence effect on the light from the first light source 103, which is beneficial to improving the accuracy of the display device 118 acquiring the target signal through the signal receiving member 112; when the distance between the collimating bodies 106 is larger or the distribution density is smaller, the light of the first light source 103 can be emitted from the collimating member 105 to the display panel 111 more conveniently, which is beneficial to increasing the light output of the backlight module 100. Therefore, the spacing between the collimating bodies 106 in the signal receiving area is smaller than the spacing between the collimating bodies 106 outside the signal receiving area or the distribution density of the collimating bodies 106 in the signal receiving area is greater than the distribution density of the collimating bodies 106 outside the signal receiving area, which is beneficial to improving the accuracy of the display device 118 acquiring the target signal through the signal receiving member 112 and improving the light utilization rate of the backlight module 100.
In this embodiment, when the collimating body 106 is a rectangular parallelepiped or a square, the ratio of the width of the collimating body 106 in the first direction to the thickness of the collimating body 106 and the ratio of the width of the collimating body 106 in the second direction to the thickness of the collimating body 106 may be controlled, so as to control the angle ranges of the exit angles of the light rays derived from the first gap and the second gap, where the larger the ratio is, the larger the angle range of the exit angle is, and the smaller the ratio is, the smaller the angle range of the exit angle is; similarly, when the collimating body 106 is a cylinder, the angular range of the exit angles of the light rays derived from the first gap and the second gap can be controlled by controlling the ratio of the diameter of the collimating body 106 to the thickness of the collimating body 106. When the collimating body 106 is a trapezoidal column, the angular range of the exit angles of the light rays derived from the first gap and the second gap can be controlled by controlling the ratio of the width of the first side surface of the collimating body 106 in the first direction to the thickness of the collimating body 106 and the ratio of the width of the first side surface of the collimating body 106 in the second direction to the thickness of the collimating body 106, or controlling the ratio of the width of the second side surface of the collimating body 106 in the first direction to the thickness of the collimating body 106 and the ratio of the width of the second side surface of the collimating body 106 in the second direction to the thickness of the collimating body 106.
In this embodiment, at least in the signal identification region, the exit angle of the light derived from the first gap and the second gap may be less than or equal to 22 degrees, and preferably less than or equal to 18 degrees. When the exit angles of the light rays derived from the first gap and the second gap are greater than 22 degrees, the dispersion degree of the light rays of the backlight module 100 is too high, which is not favorable for improving the accuracy of the display device 118 using the backlight module 100 to obtain the target signal through the signal receiving component 112 (for example, is not favorable for improving the fingerprint identification rate of the display device in the display area); when the exit angle of the light rays derived from the first gap and the second gap is less than or equal to 18 degrees, it is beneficial to effectively improve the accuracy of the display device 118 using the backlight module 100 to obtain the target signal through the signal receiving member 112.
Referring to fig. 9, in the present embodiment, the backlight module 100 further includes a second light source 117, and the second light source 117 is located between the light guide layer 101 and the reflection layer 102 in the signal receiving area.
The light guide layer 101 includes a fourth side surface close to the optical assembly, a fifth side surface close to the reflective layer 102, and a sixth side surface connecting the fourth side surface and the fifth side surface, the first light source 103 may be disposed on the sixth side surface, and the first light source 103 may also be located between the light guide layer 101 and the reflective layer 102.
Similarly, the second light source 117 may be disposed on the sixth side surface and opposite to the first light source 103; alternatively, the second light source 117 may be located between the light guide layer 101 and the reflective layer 102. When the second light source 117 is located between the light guide layer 101 and the reflection layer 102, the second light source 117 may be located in the signal receiving area.
Through the arrangement of the second light source 117, the total amount of light emitted to the display panel 111 by the backlight module 100 is increased, and the accuracy of the display device 118 acquiring the target signal through the signal receiving member 112 is improved, and meanwhile, the display effect of the display device 118 during normal display is improved. The collimating means 105 also converges the light from the second light source 117 in both directions, as it does with the first light source 103.
When the distribution density of the collimating bodies 106 in the signal receiving area is greater than the distribution density of the collimating bodies 106 outside the signal receiving area, or the distance between the collimating bodies 106 in the signal receiving area is smaller than the distance between the collimating bodies 106 outside the signal receiving area, the second light source 117 is disposed in the signal receiving area, which is beneficial to avoiding the problem that the display panel is not uniform in display due to the decrease of the light emitted from the backlight module 100 to the display panel 111 in the signal receiving area caused by the increase of the distribution density of the collimating bodies 106 or the decrease of the distance between the collimating bodies 106.
In this embodiment, the first direction is parallel to an extending direction of the scan lines of the display panel 111, and the second direction is parallel to an extending direction of the data lines of the display panel 111. At this time, the first direction is perpendicular to the second direction, and the collimating member 105 has the best convergence effect on the light from the light source of the backlight module 100 in two directions, which is beneficial to reducing the dispersion degree of the light emitted from the light source of the backlight module 100 to the display panel 111 to the greatest extent.
Meanwhile, an orthographic projection of the first gap in a first plane where the display panel 111 is located may not coincide with an orthographic projection of the scan line in the first plane, and/or an orthographic projection of the second gap in the first plane may not coincide with an orthographic projection of the data line in the first plane. When the orthographic projection of the first gap in the first plane is not coincident with the orthographic projection of the scan line in the first plane, the collimating body 106 has a first coincident portion with the scan line; when the orthographic projection of the second gap in the first plane is not coincident with the orthographic projection of the data line in the first plane, the collimator 106 has a second coincident portion with the data line. At this time, the light from the backlight module 100 can be reduced from being irradiated to the scan lines and/or the data lines, thereby avoiding the loss of light emission, the influence of the performance of the data lines and/or the scan lines, or other factors affecting the display performance of the display device 118.
In this embodiment, by the arrangement of the collimating component 105, the light from the light source of the backlight module 100 is led out from the first gap and the second gap, and the light emitted from the light source of the backlight module 100 is converged in two directions, so that the dispersion degree of the light emitted from the backlight module 100 is reduced, and the accuracy of the display device 118 acquiring the target signal through the signal receiving component 112 is improved.
The invention provides a backlight module and a display device. The backlight module comprises a first light source and a collimation component, wherein the collimation component is positioned on one side of the first light source close to the light-emitting side of the backlight module. The collimating component comprises a plurality of collimating bodies arranged at intervals, at least a first gap extending along a first direction and a second gap extending along a second direction are formed between every two adjacent collimating bodies, and the first gap and the second gap are used for guiding out light rays emitted by the first light source. The first direction intersects the second direction. According to the invention, through the arrangement of the collimation component, the light from the light source is led out from the first gap and the second gap, and the light emission of the light from the light source is converged in two directions, so that the dispersion degree of the light emission of the backlight module is reduced, and the accuracy of the display device for acquiring the target signal through the signal receiving component is improved.
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 backlight module and the display device provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation of the invention, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A backlight module is characterized by comprising a first light source and a collimating component, wherein the collimating component is positioned at one side of the first light source close to the light-emitting side of the backlight module;
the collimating component comprises a plurality of collimating bodies arranged at intervals, at least a first gap extending along a first direction and a second gap extending along a second direction are formed between every two adjacent collimating bodies, and the first gap and the second gap are used for guiding out light rays emitted by the first light source;
the first direction intersects the second direction.
2. A backlight module according to claim 1, wherein the collimating body comprises a first light absorbing layer.
3. The backlight module according to claim 1 or 2, wherein the collimating body comprises a first reflective layer, the first reflective layer is located on a side of the collimating body away from the light exit side of the backlight module, and/or the first reflective layer is located on a side of the collimating body close to the light exit side of the backlight module.
4. The backlight module according to claim 1, wherein the collimating member further comprises a first substrate, the collimating body is located at a side of the first substrate away from the light exit side of the backlight module; or,
the collimator is positioned on one side of the first substrate close to the light-emitting side of the backlight module.
5. A backlight module according to claim 1, wherein the collimating bodies are in the shape of cylinders or trapezoidal columns.
6. The backlight module according to claim 1, further comprising a diffuser layer on a side of the collimating member away from the light exit side of the backlight module, a light guide layer on a side of the diffuser layer away from the collimating member, and a reflector layer on a side of the light guide layer away from the collimating member, wherein the first light source is located between the reflector layer and the diffuser layer.
7. A display device, comprising the backlight module as claimed in any one of claims 1 to 6, and a display panel and a signal receiving member located at the light exit side of the backlight module.
8. The display device according to claim 7, wherein the display device comprises a signal receiving area, the signal receiving member is located in the signal receiving area, and the distribution density of the collimating bodies located in the signal receiving area is greater than the distribution density of the collimating bodies located outside the signal receiving area; or,
the spacing between the collimating bodies located within the signal receiving area is less than the spacing of the collimating bodies located outside the signal receiving area.
9. The display device according to claim 8, wherein the backlight module further comprises a second light source, and the second light source is located between the light guide layer and the reflective layer of the backlight module in the signal receiving area.
10. The display device according to claim 7, wherein the first direction is parallel to an extending direction of a scan line of the display panel, and wherein the second direction is parallel to an extending direction of a data line of the display panel.
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| CN202011498497.6A CN112596301A (en) | 2020-12-17 | 2020-12-17 | Backlight module and display device |
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| CN202011498497.6A CN112596301A (en) | 2020-12-17 | 2020-12-17 | Backlight module and display device |
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