CN210090874U - Direct type backlight assembly and display device - Google Patents
Direct type backlight assembly and display device Download PDFInfo
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- CN210090874U CN210090874U CN201920557164.2U CN201920557164U CN210090874U CN 210090874 U CN210090874 U CN 210090874U CN 201920557164 U CN201920557164 U CN 201920557164U CN 210090874 U CN210090874 U CN 210090874U
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Abstract
The utility model provides a straight following formula backlight unit and display device relates to and shows technical field for there is the problem of shadow in the top position of prism in the three-dimensional reflector plate when solving straight following formula backlight unit based on three-dimensional reflector plate and showing the image. The method comprises the following steps: the three-dimensional reflector plate, the light sources, the reflecting film and the diffusion plate are sequentially arranged along the light emitting direction; the reflecting film is arranged between the diffusion plate and the three-dimensional reflecting sheet, the surface of the reflecting film close to the light source is contacted with the top of the prism, and the reflecting film is used for reflecting the first incident light and transmitting the second incident light; the first incident light is the light emitted by the light source and enters the reflecting film at a first angle through the diffusion plate; the second incident light is the light emitted by the light source and is incident to the reflective film at a second angle; the utility model discloses a setting comes the light that the reflection film that the reflection light source sent with the top contact of arris body, and then eliminates the shadow that the top position of arris body exists in the three-dimensional reflector plate. The utility model is used for display device.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a straight following formula backlight unit and display device.
Background
With the development of display technology, users continuously make higher demands on the display effect of the display device, and in practical situations, since the contrast of the display device can significantly affect the display effect of the display device, how to improve the contrast of the display device has become a key for improving the display effect of the display device. In the case of liquid crystal display, since the liquid crystal itself does not emit light, illumination of a backlight in a backlight assembly is required to improve the contrast of the liquid crystal display. In order to make the display device have higher contrast ratio in order to reach better display effect, all will install the stereoscopic reflection piece in the direct type backlight assembly that is applied to liquid crystal display, and measured data shows, through setting up the stereoscopic reflection piece in the direct type backlight assembly, can make the contrast ratio of liquid crystal display reach 50000: 1, thereby realizing better display effect.
However, in the direct type backlight assembly using the stereoscopic reflective sheet, when the image frame is bright (for example, the image frame is a white frame), dark shadows similar to a checkerboard appear in the image, which seriously affects the display effect of the image.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a straight following formula backlight unit and display device for there is the technical problem of shadow at the top position of prism in the three-dimensional reflector plate when solving among the prior art when straight following formula backlight unit based on three-dimensional reflector plate shows the image.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
in a first aspect, there is provided a direct type backlight assembly, including: the light source is positioned on the bottom surface of the cavity, the side surfaces of the adjacent cavities form prisms used for spacing the adjacent cavities, the tops of the prisms are close to the diffusion plate, and a reflection film is arranged between the three-dimensional reflection sheet and the diffusion plate; the surface of the reflecting film close to the light source is contacted with the top of the prism;
the reflecting film is used for reflecting the first incident light and transmitting the second incident light; the first incident light is light emitted by the light source and enters the reflecting film at a first angle through the diffusion plate; the second incident light is the light emitted by the light source and is incident to the reflective film at a second angle; the first angle is greater than or equal to a predetermined angle threshold and the second angle is less than the predetermined angle threshold.
The embodiment of the utility model provides an among the straight following formula backlight unit that provides, include: the light source comprises a three-dimensional reflection sheet, a plurality of light sources, a reflection film and a diffusion plate, wherein the three-dimensional reflection sheet comprises a plurality of cavities arranged in an array, each cavity is composed of a bottom surface and a side surface, each light source is positioned on the bottom surface of each cavity, the side surfaces of the adjacent cavities form prisms used for separating the adjacent cavities, the tops of the prisms are close to the diffusion plate, the surfaces, close to the light sources, of the reflection film are in contact with the tops of the prisms, the reflection film can reflect first incident light rays which are incident to the reflection film through the diffusion plate at a first angle, so that the top positions of the prisms can reflect light rays emitted by the light sources through the reflection film, and the first incident light rays are emitted by the light sources and the first angle is; meanwhile, the reflecting film also transmits a second incident light ray emitted by the light source and incident on the reflecting film at a second angle, so that the second incident light ray emitted by the light source and incident on the reflecting film at the second angle can be emitted along the light emitting direction through the reflecting film, wherein the second angle is smaller than a preset angle threshold value. Therefore, the embodiment of the utility model provides an among the straight following formula backlight unit, through set up the reflectance coating between diffuser plate and three-dimensional reflector plate and reflect and send and through the first incident light of incident diffuser plate incidence to the reflectance coating by the light source, because the top contact of reflectance coating and arris body and reflectance coating can cover arris body top position, make the top position of arris body can pass through the light that reflectance coating reflection light source sent, thereby make the regional luminescent process in a poor light of straight following formula backlight unit no longer receive the restriction of cavity structure in the three-dimensional reflector plate, and then eliminate the shadow that the top position of the arris body of three-dimensional reflector plate exists in the liquid crystal display, promote the display effect of image.
In a second aspect, a display device is provided, which includes the direct-type backlight assembly.
It can be understood that any of the display devices provided above includes the direct type backlight assembly provided in the first aspect, and the beneficial effects that can be achieved by the direct type backlight assembly provided in the first aspect above and the beneficial effects of the solutions in the following detailed description are referred to, and are not repeated herein.
Drawings
In order to illustrate more clearly the embodiments of the invention or the solutions of the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the invention, the drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the invention.
FIG. 1a is a schematic cross-sectional view illustrating a three-dimensional reflection sheet provided in a direct type backlight assembly;
FIG. 1b illustrates a top view of a stereoscopic reflective sheet in a direct type backlight assembly;
FIG. 1c is a schematic cross-sectional view illustrating a flat reflective sheet provided in a direct type backlight assembly;
fig. 2 is a schematic cross-sectional view illustrating an embodiment of a direct-type backlight assembly according to the present invention;
fig. 3a shows a schematic cross-sectional structure diagram of a three-dimensional reflector provided by the present invention;
fig. 3b shows a top view of the three-dimensional reflective sheet provided by the present invention;
fig. 3c is a schematic diagram of a three-dimensional reflector provided by the present invention;
fig. 4 is a schematic diagram illustrating the effect of the reflective film provided by the present invention on light;
FIG. 5 is a schematic view showing the scattering effect of the diffuser plate;
fig. 6 is a schematic cross-sectional view illustrating an embodiment of a direct type backlight assembly according to the present invention;
fig. 7 is a schematic cross-sectional view illustrating an embodiment of a direct type backlight assembly according to the present invention;
fig. 8 is a schematic cross-sectional view illustrating another embodiment of a direct-type backlight assembly according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. The use of the terms first, second, etc. do not denote any order, and the terms first, second, etc. may be interpreted as names of the objects described. In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," in an embodiment of the present invention should not be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
Before introducing the embodiments of the present invention, a simple introduction is first made to the current liquid crystal display technology. In particular, in the liquid crystal display, since the liquid crystal itself does not emit light, illumination of a backlight source in the backlight assembly is required to improve the contrast of the liquid crystal display. For a common liquid crystal display, under a graphic card with both a bright image and a dark image, because the backlight brightness corresponding to the bright image position and the dark image position is almost the same, the contrast of the liquid crystal display can only be the contrast of the liquid crystal panel, and the contrast of the liquid crystal panel can reach 1000: 1, which is far from meeting the needs of the market as well as the users. In order to effectively improve the contrast ratio of the liquid crystal display, a commonly used technique is a local dimming technique (local dimming), that is: the backlight area is divided into a plurality of small subareas, and the brightness of the backlight light source in each small subarea is controlled by a control circuit. In practical situations, when the brightness of the image corresponding to each small partition position is high, the brightness of the backlight light source in the small partition is improved through the control circuit; on the contrary, when the brightness of the image corresponding to the small partition position is low, the brightness of the backlight light source in the small partition is correspondingly reduced through the control circuit, and then the contrast of the liquid crystal display is improved. At present, the regional light control technology is mostly applied to the direct type backlight assembly, and tests show that the contrast of liquid crystal display can reach 10000 on the premise of adopting the regional light control technology: 1 or even higher. On the basis, the stereoscopic reflector is arranged in the direct type backlight assembly, so that the contrast of liquid crystal display can reach 50000: 1, and further realizing a better display effect. Referring to fig. 1a in detail, fig. 1a is a schematic cross-sectional view illustrating a stereoscopic reflective sheet disposed in a direct type backlight assembly, including: the light source module comprises a three-dimensional reflection sheet, a light source, a diffusion plate and a quantum dot film which are sequentially stacked along the light emitting direction. The three-dimensional reflector plate comprises a plurality of cavities, prisms are arranged between adjacent cavities to separate the adjacent cavities, and the top of each prism supports the diffusion plate. In specific implementation, since the brightness of the light source in each cavity can only affect the brightness of the backlight area in the cavity, the contrast ratio of the liquid crystal display can be significantly improved by controlling the brightness of the light source in each cavity.
However, in practical situations, due to the limitation of the hollow cavity structure of the three-dimensional reflective sheet, the light emitted by the light source is difficult to reach the top of the prism, which causes a dark shadow at the position in the liquid crystal display; further, when the height of the prism is higher, the light irradiated to the side surface close to the prism is less, and the dark shadow becomes more conspicuous. In a specific implementation, when an image is bright (for example, the image is a white image), because the top of the prism of the stereoscopic reflective sheet is shaped like a checkerboard (see fig. 1 b), a shadow like a checkerboard appears in the image, and the display effect of the image is seriously affected. In addition, if the flat reflective sheet is used to replace the three-dimensional reflective sheet, as shown in fig. 1c, fig. 1c shows a schematic cross-sectional structure of the flat reflective sheet disposed in the direct-type backlight assembly, and the flat reflective sheet is not provided with the prisms, so that the shadows generated by the prisms in the image frame can be eliminated to a certain extent; however, in the planar reflective sheet, since the light sources are located in the same cavity, each position in the back light area is affected by a plurality of light sources, and it is difficult to achieve a high contrast ratio under the structure of the three-dimensional reflective sheet, and thus it is also difficult to obtain an ideal display effect.
Based on the above problem, the utility model provides a straight following formula backlight assembly to there is the technical problem of shadow at the top position of prism in the three-dimensional reflector plate when solving among the prior art based on three-dimensional reflector plate's straight following formula backlight assembly display image. Specifically, in the embodiment of the present invention, the direct type backlight assembly at least includes: the light source comprises a three-dimensional reflection sheet, a plurality of light sources, a reflection film and a diffusion plate which are sequentially arranged along the light emitting direction. The three-dimensional reflector plate comprises a plurality of cavities arranged in an array, the cavities are composed of bottom surfaces and side surfaces, the light sources are located on the bottom surfaces of the cavities, the side surfaces of adjacent cavities form prisms used for spacing the adjacent cavities, and the tops of the prisms are close to the diffusion plate.
A reflecting film is arranged between the three-dimensional reflecting sheet and the diffusion plate, and the surface of the reflecting film close to the light source is contacted with the top of the prism; the reflecting film is used for reflecting the first incident light and transmitting the second incident light; the first incident light is light emitted by the light source and enters the reflecting film at a first angle through the diffusion plate; the second incident light is the light emitted by the light source and is incident to the reflective film at a second angle; the first angle is greater than or equal to a predetermined angle threshold and the second angle is less than the predetermined angle threshold.
The following embodiments are provided to describe the present invention in detail.
Fig. 2 is a schematic cross-sectional view illustrating an embodiment of a direct-type backlight assembly according to the present invention. As shown in fig. 2, the present invention provides a direct-type backlight assembly 200 at least comprising: the three-dimensional reflection sheet 21, the light source 22, the reflection film 23, and the diffusion plate 24 are sequentially arranged in the light outgoing direction.
The stereoscopic reflecting sheet 21 will be described first. Specifically, fig. 3a and 3b show schematic structural diagrams of an embodiment of the three-dimensional reflective sheet 21 in the direct-type backlight assembly provided by the present invention. Fig. 3a shows a schematic cross-sectional structure diagram of the stereoscopic reflective sheet 21, fig. 3b shows a top view of the stereoscopic reflective sheet 21, and fig. 3c shows a schematic real object diagram of the stereoscopic reflective sheet 21.
Referring to fig. 3a and 3b, the stereoscopic reflective sheet 21 includes: a plurality of cavities 211 arranged in an array. Wherein each cavity 211 is composed of a bottom surface 2111 and a side surface 2112, the shape of the bottom surface 2111 is preferably a regular quadrangle to ensure the uniformity of the light emission of the backlight area in each cavity 211. The side 2112 of the adjacent cavity 211 constitutes a prism 212 for spacing the adjacent cavities 211, and the top of the prism 212 is close to the diffuser plate 24 and in contact with the reflective film 23. In one embodiment, the prism 212 can block light emitted from the light source in any cavity adjacent to the cavity from entering the backlight area of the cavity, so as to prevent the light from being affected by a plurality of light sources at the same position in the backlight area. The height Z of the prism 212 can be set by those skilled in the art according to practical situations, and the present invention is not limited thereto. In particular, the height Z of the prisms 212 is preferably a light mixing distance. Wherein, the top of the prism 212 can also be used to support the reflective film 23 because the prism 212 and the cavity 211 are arranged in a similar array.
The light source 22 is disposed at the bottom surface of the cavity 211; referring to FIG. 3b, the bottom surface 2111 is provided with a circular hole positioned for mounting the light source 22. Light emitted from the light source 22 is reflected by the three-dimensional reflection sheet 21 and enters the reflection film 23.
The reflection film 23 is provided between the three-dimensional reflection sheet 21 and the diffusion plate 24, and specifically, as shown in fig. 2 and 3a, a surface of the reflection film 23 close to the light source 22 is in contact with the top of the prism 212, and the other surface of the reflection film 23 is close to the diffusion plate 24 or in contact with the diffusion plate 24 (the other surface of the reflection film 23 is in contact with the diffusion plate 24 in fig. 2). In a specific implementation, reflective film 23 may cover the entire backlight area of the direct-lit backlight assembly, including the locations of the tops of prisms 212. The reflective film 23 satisfies the following reflection-transmission conditions: when the first incident light is incident on the reflective film 23, the reflective film 23 reflects the first incident light, and when the second incident light is incident on the reflective film 23, the reflective film 23 transmits the second incident light; wherein the first incident light is emitted from the light source and enters the reflective film 23 through the diffuser 24 at a first angle; the second incident light is the light emitted from the light source and is incident on the reflective film 23 at a second angle. Wherein the first angle is greater than or equal to a predetermined angle threshold, and the second angle is less than the predetermined angle threshold; the predetermined angle threshold may be set by a person skilled in the art according to actual conditions, and the present invention is not limited thereto. In a specific implementation, the thickness of the reflective film 23 may be set such that the reflective film 23 satisfies the above-described reflective-transmissive condition.
The reflecting film 23 is formed by pressing a plurality of material layers, and the thickness and the refractive index of each material layer are designed according to the relation between the optical path difference and the wavelength of the light source, and satisfy the following conditions: the optical path difference of the first incident light is integral multiple of the wavelength of the light source; the optical path difference of the second incident light is half integral multiple of the wavelength of the light source.
For example, in an alternative, the reflective film 23 may be formed by pressing a plurality of material layers.
Specifically, fig. 4 shows a light path diagram of an incident light ray of one material layer in a reflective film formed by pressing a plurality of material layers. Referring to fig. 4, for one material layer of the reflective film 23 formed by pressing a plurality of material layers, the light ray I 'perpendicularly incident to the material layer (hereinafter referred to simply as the material layer) is reflected by r1 at the first surface of the material layer, the light ray I' is reflected by r2 at the second surface of the material layer, and the optical path difference between r1 and r2 is δ lr1r22 × H ("×" indicates operation "multiplication"); if the optical path difference 2H between r2 and r1 is lambda/2, r2 and r1 just cancel each other, and all light rays are projected through the film, namely, all the light rays which are vertically incident pass through the reflecting film with the film thickness of lambda/4, namely, the light rays which are incident at the first angle are transmitted; when the light beam I incident on the material layer at the first angle is reflected by R1 on the first surface of the material layer, and when the light beam I is refracted by the material layer to the second surface of the reflective film 23, the light beam I is reflected by R2 on the second surface of the material layer, and the optical path difference δ l between R1 and R2 isR1R2From the angle of the incident and reflected rays, H1+ H2-H3, 2H can be derived>When h1+ h2-h3, the penetration is not satisfiedBy the principle, the large-angle light is not totally reflected by the reflection film having a thickness of λ/4 of the wavelength. Therefore, in a specific implementation, the reflective film 23 with different thicknesses formed by pressing a plurality of material layers can be formed according to the wavelength of the light source in an actual situation, so that the reflective film 23 satisfies the above-mentioned reflection and transmission conditions. For example, if the light source is a blue light source, the plurality of material layers may be pressed by a reflective film of a predetermined thickness according to the wavelength of the blue light source, and the reflective film of the predetermined thickness satisfies: the blue light source which is incident to the reflecting film at a first incident angle is reflected and the blue light source which is incident to the reflecting film at a second incident angle is transmitted. In the concrete implementation, because the reflective film contacts with the top of arris body and can cover the top position of arris body, consequently through setting up above-mentioned reflective film, can make the top position of arris body pass through the light that reflective film reflection light source sent to make the regional luminous process in a poor light of straight following formula backlight unit no longer receive the restriction of cavity structure in the three-dimensional reflector plate, and then eliminate the shadow that the top position of the arris body of three-dimensional reflector plate exists in the liquid crystal display, promote the display effect of image.
In the present invention, the material type of the material layer is not limited, and the material type of the material layer can be set by those skilled in the art according to the actual situation. For example, in a preferred embodiment, the material layer may be a polyethylene terephthalate (PET) material.
The light passes through the reflective film 23 and then enters the diffuser 24. Specifically, the diffuser plate 24 is used to scatter incident light to change the exit angle of the incident light. Referring to fig. 5, when the light enters the diffusion plate 24, if the light enters the diffusion plate 24 at the second angle (corresponding to the incident angle i1 and the incident angle i3 in fig. 5), the light is diffused by the diffusion plate 24 and then exits at the first angle (corresponding to the exit angle i2 and the exit angle i4 in fig. 5). By the diffusion plate 24, light can be made incident on the reflection film 23 at the first angle as much as possible. In particular, a diffuser plate having a haze of 40 is preferably used.
Further, according to the reflection and transmission conditions satisfied by the reflection film 23, in order to ensure that the light emitted from the light source 22 passes through the reflection film 23 to the maximum extent to be emitted in the light emitting direction, it should be ensured that the incident angle of the light emitted from the light source 22 is as small as possible less than the predetermined angle threshold when the light enters the surface of the reflection film 23 on the side close to the light source. In a specific implementation, the angle between the bottom surface and the side surface of the three-dimensional reflection sheet 21 can be adjusted to set the incident angle of the light source on the reflection film 23. Specifically, an included angle between the side surface and the bottom surface of the cavity 211 in the three-dimensional reflection sheet 21 may be set to be a third angle, where the third angle satisfies that light source light emitted by the light source 22 is incident on the reflection film 23 at a second angle after being reflected by the three-dimensional reflection sheet 21. The third angle may range from 90 to 120, and in particular implementations the third angle is preferably 100.
Fig. 6 is a schematic cross-sectional view illustrating another embodiment of a direct-type backlight assembly according to the present invention. Compared with the direct type backlight assembly 200 shown in fig. 2, the direct type backlight assembly shown in fig. 6 may further include a quantum dot film 25 on a side of the diffusion plate 24 away from the light source. The quantum dot film 25 is used to generate excitation light (after light emitted from the light source is incident on the quantum reflective film, excitation light excited by the quantum reflective film, for example, when the light source is a blue light source, red light and green light are excited on the quantum reflective film), light emitted from the light source 22 is emitted to the quantum dot film 25 through the diffusion plate 24 to excite the quantum dot film 25 to generate excitation light, and the excitation light and the light emitted from the light source 22 can be mixed to form a white backlight. In specific implementation, after light of the exciting light enters the cavity of the three-dimensional reflector plate, the light is reflected by the three-dimensional reflector plate, the light source or the bent edge and other structures, so that the backlight area emits light unevenly, the light emitting effect of the direct type backlight assembly is greatly reduced, and the display effect of the display device is seriously affected. In order to avoid the above situation, in the embodiment of the present invention, the thickness of the reflective film 23 may be set so that the reflective film 23 may further satisfy the following condition: reflecting the third incident light; the third incident light is generated by the quantum dot film through light excitation emitted to the quantum dot film by the light source; the wavelength of the light wave of the third incident light is larger than that of the first incident light. In a specific implementation, since the smaller the wavelength of the light I, the more the material layers in the reflective film 23 allow the light I to be transmitted, it is necessary to ensure that the wavelength of the light of the third incident light is greater than the wavelength of the light of the first incident light (or the second incident light), so that the reflective film 23 can completely reflect the third incident light under the condition that the reflective film reflects the first incident light and transmits the second incident light.
For example, if the light source is a blue light source, and the light source excites red light and green light on the quantum reflective film, the reflective film 23 satisfies: the red light and the green light which are incident on the surface of the reflecting film 23 are totally reflected, meanwhile, the reflecting film 23 reflects the blue light which is incident on the surface of the reflecting film 23 at the first angle and transmits the blue light which is incident on the surface of the reflecting film 23 at the second angle, so that the brightness can be improved, and the light efficiency is improved.
Therefore, in the embodiment, the exciting light generated by the quantum dot film 25 is reflected by the thickness of the reflecting film 23, so that the light of the exciting light is effectively blocked from entering the cavity of the three-dimensional reflecting sheet, the shadows possibly appearing in the backlight due to the structures such as the lens hole, the bent edge, the three-dimensional reflecting sheet and the light source in the direct type backlight assembly are effectively avoided, the backlight brightness is improved, and the image display effect is effectively improved.
The embodiment of the present invention provides an, light source 22 can be light emitting diode (light emitting diode, LED) or other light emitting elements that are close with the LED performance, light source 22 preferably adopts blue light source, can set up the quantum dot material in the quantum dot diaphragm 25, above-mentioned quantum dot material can comprise red quantum dot material and green quantum dot material, red light can be sent out under the excitation of the blue light that light source 22 sent to red quantum dot material, green quantum dot material can send out the green glow under the excitation of the blue light that light source 22 sent. In the embodiment of the present invention, the wavelength range of the blue light can be 440nm to 450nm (unit: nanometer), the wavelength range of the red light can be 620nm to 660nm, and the wavelength range of the green light can be 525nm to 545 nm.
Fig. 7 is a schematic cross-sectional view illustrating an embodiment of a direct-type backlight assembly according to the present invention. Compared with the direct type backlight assembly shown in fig. 2, in the direct type backlight assembly shown in fig. 7, a reflective polarizer 26 is further disposed on the light exit side of the quantum dot film 25, and the reflective polarizer 26 is used for converting incident light entering the reflective polarizer into polarized light to exit.
Fig. 8 shows the utility model provides a section structure schematic diagram of an embodiment of another kind of straight following formula backlight unit compares with the straight following formula backlight unit that fig. 7 shows, is provided with biprism structure 27 between quantum dot diaphragm and the reflective polarization piece in the straight following formula backlight unit that fig. 8 shows, and the biprism structure carries out the angle of the refraction light after refracting to the emergent ray of quantum dot diaphragm to be less than the angle of the emergent ray of quantum dot diaphragm to effectively improve display device's white picture's luminance.
The utility model also provides a display device, include: the direct type backlight assembly described in any of the above embodiments. In a specific implementation, the display device may be a liquid crystal display device.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A direct type backlight assembly, comprising: the light source module comprises a three-dimensional reflector, a plurality of light sources and a diffusion plate, wherein the three-dimensional reflector, the plurality of light sources and the diffusion plate are sequentially arranged along a light emitting direction, and the light source module is characterized in that the three-dimensional reflector comprises a plurality of cavities arranged in an array manner, each cavity consists of a bottom surface and a side surface, the light sources are positioned on the bottom surfaces of the cavities, the side surfaces of the adjacent cavities form prisms used for spacing the adjacent cavities, the tops of the prisms are close to the diffusion plate, and a reflection film is arranged between the three-dimensional reflector and the diffusion; the surface of the reflective film near the light source is in contact with the top of the prism;
the reflecting film is used for reflecting the first incident light and transmitting the second incident light; the first incident light is the light emitted by the light source and is incident to the reflecting film at a first angle through the diffusion plate; the second incident light is the light emitted by the light source and is incident to the reflecting film at a second angle; the first angle is greater than or equal to a predetermined angle threshold, and the second angle is less than the predetermined angle threshold.
2. The direct type backlight assembly according to claim 1, wherein the reflective film is formed by pressing a plurality of material layers having thicknesses and refractive indexes designed according to the relationship between the optical path difference and the wavelength of the light source to satisfy: the optical path difference of the first incident light is integral multiple of the wavelength of the light source; the optical path difference of the second incident light is half integral multiple of the wavelength of the light source.
3. The direct type backlight assembly according to claim 1 or 2, wherein an included angle between the side surface and the bottom surface of the cavity is a third angle, and the third angle is sufficient for the light emitted from the light source to be incident on the reflective film at the second angle after being reflected by the three-dimensional reflective sheet.
4. The direct type backlight assembly according to claim 3, wherein the third angle is 100 ° -120 °.
5. The direct type backlight assembly of claim 2, wherein the material layer is a PET (polyethylene terephthalate) material.
6. The direct type backlight assembly according to claim 1 or 2, wherein a side of the diffusion plate away from the light source is provided with a quantum dot film;
the reflective film is further configured to: reflecting the third incident light; the third incident ray is generated by the quantum dot film according to the excitation of the light emitted to the quantum dot film by the light source; the light wave wavelength of the third incident light is larger than that of the light source.
7. The direct type backlight assembly according to claim 6, wherein the light emitting side of the quantum dot film sheet is provided with a reflective polarizer.
8. The direct type backlight assembly of claim 7, wherein a double prism structure is disposed between the quantum dot film and the reflective polarizer, and an angle of a refracted ray after the double prism structure refracts an emergent ray of the quantum dot film is smaller than an angle of an emergent ray of the quantum dot film.
9. The direct type backlight assembly according to claim 6, wherein the light source is a blue light source, and the quantum dot film has quantum dot material disposed therein, the quantum dot material being composed of red quantum dot material and green quantum dot material.
10. A display device comprising the direct type backlight assembly according to any one of claims 1 to 9.
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| CN201920557164.2U CN210090874U (en) | 2019-04-22 | 2019-04-22 | Direct type backlight assembly and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031341A (en) * | 2021-03-12 | 2021-06-25 | 业成科技（成都）有限公司 | Light emitting diode light source assembly and reflection structure and display structure thereof |
| CN113064301A (en) * | 2021-03-15 | 2021-07-02 | 海信视像科技股份有限公司 | Display device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031341A (en) * | 2021-03-12 | 2021-06-25 | 业成科技（成都）有限公司 | Light emitting diode light source assembly and reflection structure and display structure thereof |
| CN113064301A (en) * | 2021-03-15 | 2021-07-02 | 海信视像科技股份有限公司 | Display device |
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