CN111061091B - Optical module and display device - Google Patents
Optical module and display device Download PDFInfo
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- CN111061091B CN111061091B CN201911407646.0A CN201911407646A CN111061091B CN 111061091 B CN111061091 B CN 111061091B CN 201911407646 A CN201911407646 A CN 201911407646A CN 111061091 B CN111061091 B CN 111061091B
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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
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the invention discloses an optical module and a display device, comprising: the light source comprises a substrate base plate and a plurality of light sources, wherein the light sources are arranged on the substrate base plate and are electrically connected with the substrate base plate; a plurality of three-dimensional reflectors disposed on the substrate base, each of the three-dimensional reflectors surrounding at least one of the light sources in a direction perpendicular to the substrate base; the grating diaphragm comprises at least two opaque gratings which are intersected in the axial direction, and the grating diaphragm is positioned on one side, far away from the substrate base plate, of the three-dimensional reflector. The grating is arranged in the optical module to control the angle of light divergence, so that the large halo phenomenon of a backlight source is eliminated, the local dimming effect is realized, the light is controlled in the range corresponding to the three-dimensional reflector, and light mixing cannot be generated in adjacent areas; the contrast ratio of the optical module and the display device is greatly improved.
Description
Technical Field
The invention belongs to the technical field of display device control, and particularly relates to an optical module and a display device.
Background
The lcd panel displays images through the tft driving electrodes, and does not emit light, so the backlight source providing all light sources to the lcd panel plays an important role. According to the different positions of the backlight sources, the backlight module can be divided into a direct type backlight module and a side type backlight module, when the large-size liquid crystal display uses the side type backlight source, the cost, the size and the weight of the light guide plate are in direct proportion, the indexes such as the uniformity of a surface light source and the brightness reaching the liquid crystal screen are reduced, and the direct type backlight module has the advantages of saving electric power, increasing the brightness and reducing the cost due to the fact that a light source is directly vertical upwards and light loss is small compared with the side type backlight module, so that the direct type backlight module becomes the mainstream of the development of the backlight source of the large-size liquid crystal display panel.
In the present direct type backlight liquid crystal module, as shown in fig. 1, the halo size (halo size) is controlled by the light emitting angle of the LED, the halo at the conventional light emitting angle is large, and a smaller halo can be obtained by optimizing the light emitting angle, so that the contrast is improved, and high-contrast backlight is realized. As shown in fig. 2, an optical module, which is designed to have a three-dimensional (3D) reflector (3D reflector) to control a halo size 50, includes a substrate 10, an LED light source 20, a three-dimensional reflector 30, and an optical film 40, wherein the optical film includes a brightness enhancement sheet, a prism sheet, and the like.
The prior art has the following disadvantages:
neither the control of the LED emission angle nor the three-dimensional reflector design can control the light within a relatively small range, thus resulting in high-angle light entering the surrounding light source emitting area. As shown in FIG. 2, the LED light 50 will spread to the surrounding LED light source area, affecting the surrounding area brightness.
Disclosure of Invention
To solve the above problem, in a first aspect, an embodiment of the present invention provides an optical module, including: the light source module comprises a substrate base plate and a plurality of light sources, wherein the light sources are arranged on the substrate base plate and are electrically connected with the substrate base plate;
a plurality of three-dimensional reflectors disposed on the substrate base, each of the three-dimensional reflectors surrounding at least one of the light sources in a direction perpendicular to the substrate base;
the grating diaphragm comprises at least two opaque gratings which are intersected in the axial direction, and the grating diaphragm is positioned on one side, far away from the substrate, of the three-dimensional reflector.
In a second aspect, an embodiment of the present invention provides a display device, which includes the optical module according to the first aspect, and further includes a display panel, where the optical module is disposed on a light incident surface of the display panel.
The invention has the advantages that: the crossed grating is arranged in the optical module to control the divergence angle of light rays, so that the large halo phenomenon of a backlight LED is eliminated, the function of regional dimming is realized, the light rays are controlled in the range radiated by at least one light source, and light mixing cannot be generated in adjacent regions in the film layer; a display device with high contrast is obtained; the invention has compact structure, is easy to realize the thinning in production and ensures that users obtain better use experience.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a diagram illustrating halo size control by LED lighting angle in the prior art;
FIG. 2 is a schematic diagram of an optical module according to the prior art;
fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present invention;
FIG. 4 is a top view of a three-dimensional reflector in an optical module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another optical module according to an embodiment of the present invention; FIG. 5 is a schematic diagram illustrating a top view of an XY biaxial grating film structure provided in an embodiment of the present invention;
FIG. 6 is a top view of a grating membrane structure with two gratings perpendicular to each other according to an embodiment of the present invention;
FIG. 7 is a top view of a triaxial grating diaphragm structure provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of another optical module according to an embodiment of the present invention
FIG. 9 is a schematic diagram of another optical module according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a display device according to an embodiment of the present invention;
FIG. 11 is a simulation diagram of backlight normalization luminance in the present invention and the prior art;
FIG. 12 is a schematic representation of the brightness corresponding to illuminating a three-dimensional reflector region in accordance with an embodiment of the present invention;
fig. 13 is a graph illustrating the brightness corresponding to prior art illumination of a three-dimensional reflector region.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terms "first," "second," and the like in the description of the embodiments of the present application are used for distinguishing between descriptions and not necessarily for describing a sequential or chronological order. The term "plurality" in the description of the embodiments of the present application means two or more.
The term "and/or" in the embodiment of the present application is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Referring to fig. 3 and 4, the present invention provides an optical module, which includes a substrate 8, and a plurality of light sources 2, where the light sources 2 are disposed on the substrate 8 and electrically connected to the substrate 8, optionally, the substrate 8 is a Flexible Printed Circuit (FPC), and the light sources 2 may be one of Light Emitting Diodes (LEDs) or min-LEDs or micro-LEDs (micro-LEDs); a plurality of three-dimensional reflectors 3, the three-dimensional reflectors 3 being disposed on a substrate base plate 8, each three-dimensional reflector 3 surrounding at least one light source 2 in a direction perpendicular to the substrate base plate 8; the grating diaphragm 7, the grating diaphragm 7 includes at least two opaque gratings that intersect axially, and the grating diaphragm 7 is located on one side of the three-dimensional reflector 3 far away from the substrate base plate 8.
The invention controls the divergence angle of light rays within a small range by arranging at least two opaque gratings which are intersected in the axial direction in the optical module, ensures that the light rays only extend to the corresponding area of the substrate vertical to one three-dimensional reflector or exceed the corresponding area of one three-dimensional reflector, and a small part of light is diverged to the corresponding area of the adjacent three-dimensional reflector without influencing the light emission of the surrounding light source. Therefore, the arrangement of the grating can eliminate the large halo phenomenon of the backlight LED, the adjacent area of the three-dimensional reflector cannot generate mixed light, and the function of regional dimming is realized.
It should be noted that the drawing only illustrates that each three-dimensional reflector 3 surrounds one light source 2, and may also surround a plurality of light sources to increase the brightness of the corresponding region of each three-dimensional reflector 3, which is not limited herein. The three-dimensional reflectors 3 in the present invention are components for reflecting the light of the light source 2, and may be formed by a reflective material or a surface coated with a reflective material, and in the drawing, each three-dimensional reflector 3 includes four reflective components, which is certainly not limited to 4, and may be set according to actual requirements, and is not limited herein. With continued reference to fig. 3, the upper end of the three-dimensional reflector 3 may be in direct contact with the grating membrane 7, which may support the grating membrane 7.
The grating membrane 7 is located above the three-dimensional reflector 3 and comprises at least two axially intersecting opaque gratings. The angle of the axial intersection can be selected according to actual needs, such as 90 degrees, 45 degrees, 30 degrees, and the like. As shown in fig. 5, the grating diaphragm includes two opaque gratings perpendicular to the axial direction, and optionally, the grating diaphragm is a single biaxial grating diaphragm. Alternatively, as shown in fig. 6, the grating membrane 7 comprises two opaque gratings with vertical axes, but the grating membrane is two superimposed grating membranes, wherein each grating membrane is formed by gratings extending in one direction. The optical module provided by the invention is provided with at least two opaque grating gratings which are intersected in the axial direction, so that the divergence angle of light can be controlled, and the large halo phenomenon of a backlight light source is eliminated.
The material of the grating is a metal material or a black non-metal material, for example, the metal grating is made of nano silver, other metal materials such as metal aluminum and the like can be adopted in addition, and various parameters (the width, the thickness, the X pitch and the Y pitch) of the grating can be designed and optimized according to specific needs by using a black matrix material or other black non-metal materials. The metal grating provided by the embodiment of the invention can be manufactured by adopting a nano-imprinting or coating etching method, and the grating can be arranged in a groove arranged on a substrate of the manufactured metal grating and then subjected to plane polishing, so that the surface of a grating membrane is flat.
Alternatively, as shown in fig. 7, the grating of the inventive grating membrane may also comprise three or more intersecting gratings. The angle of the axial intersection can be selected according to actual needs, such as 90 degrees, 45 degrees, 30 degrees, and the like. As shown in fig. 7, the grating membrane 7 includes three opaque gratings that intersect in the axial direction, and optionally, the grating membrane 7 is a single triaxial grating membrane or the grating membrane 7 is three superposed grating membranes, where each grating membrane is formed by gratings extending along one direction. Through set up more gratings in optical module, can be with the luminous angle control of light in littleer scope, can further reduce the angle that light diverges, also can not be unlimited increase crossing grating number certainly, the technology degree of difficulty can increase on the one hand, and on the other hand, because the grating is opaque material, can reduce the area of final light-emitting.
The invention also provides an optical module which further comprises a diffusion plate and an optical diaphragm, referring to fig. 8, the diffusion plate 4 is arranged on one side of the grating diaphragm 7, which is far away from the substrate base plate 8, and the diffusion plate 8 comprises a plurality of diffusion mesh points; the optical diaphragm 5 is further included, and the optical diaphragm 5 is arranged on the side, far away from the grating diaphragm 7, of the diffusion plate 4. The diffusion plate 8 can further disperse and homogenize the light emitted from the grating membrane 7, and optionally, the diffusion mesh points can also be bubbles or diffusion ions. The optical film 5 may be one or more of a diffusion sheet, a prism sheet, and a brightness enhancement sheet.
With continued reference to fig. 8, the grating designed by the present invention satisfies the following formula:
P1/T3 ═ [ (W1-W2+ W3)/2]/(T1+ T2), where,
p1 is the pitch of the grating; t3 is the thickness of the grating diaphragm; w1 is the size of the halo, that is, the size of the halo is under the condition of not influencing the emergence of the light rays in the adjacent region after passing through the grating film, the diffusion sheet and the optical film; w2 is the partition size of the three-dimensional reflector; w3 is the shoulder width of the three-dimensional reflector, namely the width of the supporting action surface of the three-dimensional reflector on the side away from the substrate base plate; t1 is the total thickness of the optical film, and T2 is the thickness of the diffuser plate.
The grating structure calculated and designed according to the formula can ensure that light rays emitted by the light source are bound in a certain angle, the collected light rays are emitted after passing through the diffusion plate and the optical film, the light rays are controlled in an area limited by the three-dimensional reflector, or even if part of the light rays are emitted into an area corresponding to the surrounding three-dimensional reflector, only a small part of the collected light rays enter the surrounding area after being collected by the grating structure, so that the effect of influencing surrounding light emission is not enough, and the problem of light mixing of adjacent three-dimensional diffusers is avoided due to the arrangement of the grating. In addition, the grating structure can be designed according to different design requirements according to the formula, and the design is more diversified.
With continued reference to fig. 8, the optical module further comprises: the back plate 1, the back plate 1 accommodates and supports the substrate base plate 8, the light source 2, the three-dimensional reflector 3 and the grating diaphragm 7. The back plate 1 is generally made of aluminum and magnesium materials, and is made of metal materials, so that heat generated when the light source 2 emits light can be guided out, and a certain heat dissipation effect can be achieved. Optical module still including gluing frame 6 in addition, glues the frame and plays fixedly, cushioning effect, assembles the back together when module later stage and display panel, can prevent the effect of panel crushing for the certain buffering of reality panel.
Referring to fig. 9, the present invention further provides another optical module, further comprising a transparent plate 17, optionally, the transparent plate is transparent glass, the transparent plate 17 is disposed between the three-dimensional reflector 13 and the grating membrane 14; the grating film is characterized by further comprising an optical film 15, wherein the optical film 15 is arranged on one side, away from the grating film 14, of the transparent plate 17, and the optical film 5 can be one or more of a diffusion sheet, a prism sheet and a brightness enhancement sheet.
The purpose of the transparent plate 17 is to support the grating membrane 14, because when the grating membrane 14 is thin and easy to bend and deform, the transparent plate 17 is provided to support to prevent the grating membrane 14 from being directly arranged on the three-dimensional reflector 13, and the grating membrane can be convex and deformed towards one side of the substrate, which affects the function of the grating membrane for gathering light. It should be noted that, in the optical module structure provided with the transparent plate, a diffusion plate may be further provided, and the diffusion plate is disposed between the optical film and the grating film (not shown in the figure), and the specific structure may be set according to actual needs, and is not limited herein.
With continued reference to FIG. 9, the design formula for the grating satisfies:
P1/T3 ═ [ (W1-W2+ W3)/2]/T1, wherein,
p1 is the pitch of the grating; t3 is the thickness of the transparent plate; w1 is the size of the halo, namely the size of the halo after passing through the transparent plate, the grating diaphragm and the optical diaphragm under the condition of not influencing the light emergence of adjacent areas; w2 is the sector size of the three-dimensional reflector; w3 is the shoulder width of the three-dimensional reflector, i.e. the width of the supporting surface of the three-dimensional reflector on the side facing away from the substrate base plate; t1 is the total thickness of the optical film; t2 is the thickness of the grating diaphragm.
The grating structure calculated and designed according to the formula can ensure that light rays emitted by the light source are bound in a certain angle, the collected light rays are emitted after passing through the diffusion plate and the optical film, the light rays are controlled in an area limited by the three-dimensional reflector, or even if part of the light rays are emitted into an area corresponding to the surrounding three-dimensional reflector, only a small part of the collected light rays enter the surrounding area after being collected by the grating structure, so that the effect of influencing surrounding light emission is not enough, and the problem of light mixing of adjacent three-dimensional diffusers is avoided due to the arrangement of the grating. In addition, the grating structure can be designed according to different design requirements according to the formula, and the design is more diversified.
With continued reference to fig. 9, the optical module further comprises: a back plate 11, the back plate 11 accommodating and supporting the substrate base plate 18, the light source 12, the three-dimensional reflector 13. The back plate 11 is generally made of aluminum and magnesium materials, and is made of metal materials, so that heat generated when the light source 2 emits light can be conducted out, and a certain heat dissipation effect can be achieved. Optical module still including gluing frame 6 in addition, glues frame 6 and plays fixed, cushioning effect, and optional gluey frame is combination frame or integrated into one piece, installs on the backplate, assembles the back together with display panel when the module later stage, can prevent the effect of panel crushing for certain buffering of reality panel.
Referring to fig. 10, the present invention further provides a display device, including the optical module, and only one optical module is illustrated in fig. 10, and further including a display panel 100, where the optical module is disposed on a light incident surface of the display panel 100, and optionally, the display panel is a display panel that needs a backlight source, such as a liquid crystal display panel.
The display device may be: any product or component with a display function, such as a mobile phone, a head-up display, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the present application.
In order to more clearly reflect the folding effect of the optical module on the light in the corresponding area of each three-dimensional reflector provided by the invention, the invention provides a normalized luminance simulation diagram of the backlight in the invention and the prior art, specifically referring to fig. 11, the abscissa in fig. 11 represents the tested coordinate position, the ordinate represents the luminance/maximum luminance of the position, i.e. the ordinate represents the luminance coefficient, fig. 11 can clearly reflect that the light in the corresponding area of the three-dimensional reflector in the invention is more folded and concentrated compared with the light spreading and light mixing conditions in the surrounding area in the prior art. Therefore, the optical module provided by the invention has higher contrast.
Referring to fig. 12 and 13, fig. 12 is a graph illustrating brightness corresponding to lighting a three-dimensional reflector region according to an embodiment of the present invention, and fig. 13 is a graph illustrating brightness corresponding to lighting a three-dimensional reflector region according to the prior art. In fig. 12, the backlight area a is lit, that is, the area-a corresponding to a three-dimensional reflector is lit, and then the ratio of the brightness of the area a to the brightness of the area B is measured as the contrast of the optical module of the present invention, and the contrast can reach 333: 1, namely the contrast of two adjacent three-dimensional reflectors; in fig. 13, the backlight area C is lit, that is, an area-C area corresponding to a three-dimensional reflector is lit, and then the ratio between the luminance of the area C and the luminance of the area D is measured, as the contrast of the optical module in the prior art, as measured by a test, the contrast can reach 1.2: 1, which is the contrast of two adjacent three-dimensional reflectors, therefore, the contrast of the backlight is greatly increased by adding the grating structure. It should be noted that the A, B, C, D area of the three-dimensional reflector corresponds to the area of the display panel and includes at least one sub-pixel area, wherein one sub-pixel area represents an area defined by two adjacent gate lines and two adjacent data lines crossing each other.
For the whole display device, the design of the invention can also greatly improve the contrast of the display panel in the display device, and with reference to fig. 12, when the display panel is a liquid crystal display panel, the light-emitting brightness of the display panel corresponding to the backlight area a and the area B is tested, firstly, the pixel area of the display panel corresponding to the area a and the area B is rotated by adjusting liquid crystal to enable backlight light to penetrate, then, the brightness ratio of the area a and the area B is measured, and the contrast of the carried display panel can reach 333000:1 through test; similarly, in the prior art, the light-emitting brightness of the display panel corresponding to the C region and the D region of the backlight is tested, the pixel regions of the display panel corresponding to the C region and the D region are adjusted to rotate through the liquid crystal so that backlight light can penetrate through the pixel regions, then the brightness ratio of the C region to the D region is measured, and the contrast of the display panel carried in the prior art can reach 1200:1 as measured by tests.
The invention provides an optical module and a display device, comprising: the light source is arranged on the substrate base plate and is electrically connected with the substrate base plate; a plurality of three-dimensional reflectors disposed on the substrate base, each three-dimensional reflector surrounding at least one of the light sources in a direction perpendicular to the substrate base; the grating membrane comprises at least two opaque gratings which are intersected in the axial direction, and the grating membrane is positioned on one side of the three-dimensional reflector, which is far away from the substrate base plate. The invention controls the angle of light divergence by arranging at least two axially crossed opaque gratings in the optical module, thereby eliminating the large halo phenomenon of a backlight source, realizing the function of regional dimming, controlling the light in the range corresponding to the three-dimensional reflector and not generating mixed light in adjacent regions; the contrast ratio of the optical module and the display device is greatly improved.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An optical module, comprising:
the light source module comprises a substrate base plate and a plurality of light sources, wherein the light sources are arranged on the substrate base plate and are electrically connected with the substrate base plate;
a plurality of three-dimensional reflectors disposed on the substrate base, each of the three-dimensional reflectors surrounding at least one of the light sources in a direction perpendicular to the substrate base;
the grating diaphragm comprises two opaque gratings which are vertical to each other in the axial direction, and the grating diaphragm is positioned on one side, away from the substrate, of the three-dimensional reflector;
the diffusion plate is arranged on one side, away from the substrate base plate, of the grating membrane and comprises a plurality of diffusion mesh points; the optical diaphragm is arranged on one side, far away from the grating diaphragm, of the diffusion plate;
the design formula of the grating satisfies:
P1/T3 ═ [ (W1-W2+ W3)/2]/(T1+ T2), where,
p1 is the distance of the grating, T3 is the thickness of the grating diaphragm, W1 is the size of the halo, W2 is the size of the partition of the three-dimensional reflector, W3 is the shoulder width of the three-dimensional reflector, T1 is the total thickness of the optical diaphragm, and T2 is the thickness of the diffusion plate.
2. An optical module, comprising:
the light source module comprises a substrate base plate and a plurality of light sources, wherein the light sources are arranged on the substrate base plate and are electrically connected with the substrate base plate;
a plurality of three-dimensional reflectors disposed on the substrate base, each of the three-dimensional reflectors surrounding at least one of the light sources in a direction perpendicular to the substrate base;
the grating diaphragm comprises two opaque gratings which are vertical to the axial direction, and the grating diaphragm is positioned on one side, away from the substrate, of the three-dimensional reflector;
a transparent plate disposed between the three-dimensional reflector and the grating membrane; the grating diaphragm is arranged on one side of the grating diaphragm, which is far away from the transparent plate;
the design formula of the grating satisfies:
P1/T3 ═ [ (W1-W2+ W3)/2]/T1, wherein,
p1 is the pitch of the grating, T3 is the thickness of the transparent plate, W1 is the size of the halo, W2 is the size of the partition of the three-dimensional reflector, W3 is the shoulder width of the three-dimensional reflector, and T1 is the total thickness of the optical diaphragm.
3. An optical module according to claim 1 or 2,
the grating diaphragm is a single biaxial grating diaphragm or a plurality of superposed grating diaphragms, wherein each grating diaphragm is formed by a grating extending along one direction.
4. An optical module according to claim 1 or 2,
the material of the grating is a metal material or a black non-metal material.
5. An optical module according to claim 1 or 2,
the optical module further comprises a back plate, and the back plate accommodates and supports the substrate base plate, the light source, the three-dimensional reflector and the grating diaphragm.
6. A display device, comprising the optical module according to any one of claims 1 to 5, and further comprising a display panel, wherein the optical module is disposed at the light incident surface of the display panel.
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