CN109709720B - Backlight module and display device - Google Patents
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- CN109709720B CN109709720B CN201910136983.4A CN201910136983A CN109709720B CN 109709720 B CN109709720 B CN 109709720B CN 201910136983 A CN201910136983 A CN 201910136983A CN 109709720 B CN109709720 B CN 109709720B
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Abstract
The embodiment of the invention provides a backlight module and a display device. Display device includes display panel and backlight unit, display panel includes a plurality of pixel unit that the matrix was arranged, every pixel unit includes that the difference that the periodic arrangement sees through the M sub-pixel of different monochromatic light, backlight unit is including the luminous layer and the light modulation layer of overlapping, the luminous layer includes a plurality of light source unit that the matrix was arranged, every light source unit includes the M luminous unit of the different monochromatic light of periodic arrangement's difference outgoing, the light modulation layer is used for modulating the monochromatic light of every luminous unit outgoing into the N light beams that the angle is different, and N light beam is a plurality of sub-pixels of shooting respectively, the colour of luminous unit outgoing light is the same with the colour that N sub-pixel sees through the light. According to the backlight module, the light modulation layer is arranged in the backlight module, and monochromatic light does not need to be mixed, so that the problem of uneven light mixing is solved, the light utilization rate and the color gamut are improved, and the power consumption is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of Light Emitting Diode (LED) chip manufacturing and packaging technology, submillimeter LEDs (Mini LEDs) and Micro LEDs (Micro LEDs) have gradually occupied a place in the display field. The Mini LED has a grain size of about 100 to 200 microns, is easier to mass produce, has a higher yield, and is widely used for illumination and backlight modules in displays, compared to Micro LEDs having a grain size of less than 50 microns.
The Liquid Crystal Display (LCD) device adopts the Mini LED as a backlight source, which not only reduces the number of structures such as light guide plates and reflectors and is beneficial to the reduction of the thickness of the backlight module, but also can realize more precise High Dynamic Range (HDR) division, has special-shaped cutting characteristics, and can form a backlight form with a High curved surface by matching with a flexible substrate, thereby meeting the market demands of power saving, thinning, HDR, special-shaped Display and the like, so that the Mini LED gradually becomes a mainstream backlight source in the fields of mobile phones, televisions, vehicle-mounted Display, notebooks and the like.
When the Mini LED is applied to a backlight module and used as a surface light source, a single Mini LED is an independent luminous body, namely, the backlight is composed of a plurality of light source points, and the uniform surface light source can be realized only by mixing light after the light is emitted by the light source points. At present, in the conventional backlight module, three monochromatic Mini LEDs of red, green and blue are generally arranged in a periodic two-dimensional arrangement, and the three monochromatic Mini LEDs emit light simultaneously and emit light after being mixed to form white light.
The inventor of the application finds that the existing color mixing scheme has the problems of uneven light mixing, low light utilization rate, large power consumption, poor color gamut and the like.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a backlight module and a display device, so as to solve the problems of uneven light mixing, low light utilization rate, large power consumption, poor color gamut, and the like existing in the existing color mixing scheme.
In order to solve the above technical problem, an embodiment of the present invention provides a display device, including a display panel and a backlight module, where the display panel includes a plurality of pixel units arranged in a matrix, each pixel unit includes M sub-pixels arranged periodically and respectively transmitting different monochromatic lights, the backlight module includes a light emitting layer and a light modulation layer that are stacked, the light emitting layer includes a plurality of light source units arranged in a matrix, each light source unit includes M light emitting units arranged periodically and respectively transmitting different monochromatic lights, the light modulation layer is located above a side surface of the display panel adjacent to the light emitting layer, the light modulation layer is configured to modulate the monochromatic lights emitted by each light emitting unit into N light beams with different exit angles, and the N light beams respectively emit to the N sub-pixels, and the colors of the light emitted by the light emitting units are the same as the colors of the light transmitted by the N sub-pixels, m is a positive integer greater than or equal to 3, and N is a positive integer greater than or equal to 2.
Optionally, the light modulation layer includes the grating flat board, and sets up a plurality of grating units that just matrix was arranged on the grating flat board, every grating unit includes the M grating portion of periodic arrangement, the position of one grating portion in the M grating portion with the position of one luminescence unit among M luminescence units is corresponding, and every grating portion is used for modulating the monochromatic light of the luminescence unit outgoing that corresponds into N light beams that the angle of departure is different.
Optionally, the M grating portions are disposed on a surface of the grating plate adjacent to the light emitting layer side, or disposed on a surface of the grating plate away from the light emitting layer side.
Optionally, each grating portion includes a plurality of diffraction gratings with different grating periods, and each diffraction grating is configured to modulate monochromatic light emitted by the light emitting unit into one light beam.
Optionally, the planes of the plurality of diffraction gratings have an angle θ with the surface of the grating platei，θi＝0°～20°。
Optionally, the light modulation layer is made of polymethyl methacrylate, styrene-methyl methacrylate copolymer, or polycarbonate, each diffraction grating includes a plurality of regularly arranged pits or protrusions formed on the surface of the grating plate, and the widths of the plurality of pits or protrusions are the same.
Optionally, the display device further comprises the diffusion layer, and the diffusion layer is located above the surface of the light modulation layer adjacent to one side of the display panel.
Optionally, the M sub-pixels include a first sub-pixel transmitting the first monochromatic light, a second sub-pixel transmitting the second monochromatic light, and a third sub-pixel transmitting the third monochromatic light; the M light emitting units comprise a first light emitting unit emitting first monochromatic light, a second light emitting unit emitting second monochromatic light and a third light emitting unit emitting third monochromatic light; the light modulation layer is used for modulating the first monochromatic light of first luminescence unit outgoing into N light beams, and N light beams respectively shoot to N first sub-pixels, will the second monochromatic light of second luminescence unit outgoing is modulated into N light beams, and N light beams respectively shoot to N second sub-pixels, will the third monochromatic light of third luminescence unit outgoing is modulated into N light beams, and N light beams shoot to N third sub-pixels respectively.
Optionally, the first monochromatic light comprises red light, the second monochromatic light comprises green light, the third monochromatic light comprises blue light, N is 2-6, and the light emitting unit comprises a submillimeter light emitting diode Mini LED.
The embodiment of the invention also provides a backlight module, which comprises a light emitting layer and a light modulation layer which are stacked, wherein the light emitting layer comprises a plurality of light source units which are arranged in a matrix, each light source unit comprises M light emitting units which are periodically arranged and respectively emit different monochromatic light, the light modulation layer is used for modulating the monochromatic light emitted by each light emitting unit into N light beams with different emergence angles, and each light beam has a set emergence direction; wherein M is a positive integer greater than or equal to 3, and N is a positive integer greater than or equal to 2.
Optionally, the light modulation layer includes the grating flat board, and sets up a plurality of grating units that matrix was arranged on the grating flat board, every grating unit includes the M grating portion of periodic arrangement, the position of one grating portion in the M grating portion with the position of one light emitting unit among the M light emitting unit is corresponding, and every grating portion is used for modulating the monochromatic light of the light emitting unit outgoing that corresponds into N light beams that the exit angle is different.
Optionally, the M grating portions are disposed on a surface of the grating plate adjacent to the light emitting layer side, or disposed on a surface of the grating plate away from the light emitting layer side.
Optionally, each grating portion includes a plurality of diffraction gratings with different grating periods, and each diffraction grating is configured to modulate monochromatic light emitted by the light emitting unit into one light beam.
Optionally, the planes of the plurality of diffraction gratings and the surface of the grating plate have an included angle θ therebetweeni，θi＝0°～20°。
Optionally, the light modulation layer is made of polymethyl methacrylate, styrene-methyl methacrylate copolymer, or polycarbonate, each diffraction grating includes a plurality of regularly arranged pits or protrusions formed on the surface of the grating plate, and the widths of the plurality of pits or protrusions are the same.
Optionally, the light emitting device further comprises the diffusion layer, and the diffusion layer is located above the surface of the light modulation layer on the side far away from the light emitting layer.
Optionally, the M light emitting units include a first light emitting unit emitting first monochromatic light, a second light emitting unit emitting second monochromatic light, and a third light emitting unit emitting third monochromatic light; the first monochromatic light comprises red light, the second monochromatic light comprises green light, and the third monochromatic light comprises blue light; n is 2-6; the light emitting unit comprises a submillimeter light emitting diode Mini LED.
The embodiment of the invention provides a backlight module and a display device, wherein a light modulation layer is arranged in the backlight module and is used for modulating monochromatic light emitted by each light emitting unit into a plurality of light beams with different exit angles, and the plurality of light beams are respectively incident into a plurality of sub-pixels which penetrate through the same color, so that the problem of nonuniform light mixing is solved, the light utilization rate and the color gamut are improved, and the power consumption is reduced.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention. The shapes and sizes of the various elements in the drawings are not to scale and are merely illustrative of the principles of the invention.
FIG. 1 is a schematic structural diagram of a display device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a light modulation layer according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a diffraction grating structure;
FIG. 4 is a diagram illustrating a chirped diffraction grating according to a first embodiment of the present invention;
FIG. 5 is a diagram illustrating the light deflection of a chirped diffraction grating according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating an operation of a display device according to a first embodiment of the present invention;
FIG. 7 is a schematic overall view of a display device according to a first embodiment of the present invention;
FIG. 8 is a schematic view of a light modulating layer according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a backlight module according to an embodiment of the invention.
Description of reference numerals:
100-a backlight module; 200-a display panel; 10-a backlight substrate;
11-a light-emitting layer; 12 — a light modulation layer; 13-a diffusion layer;
111 — a first light emitting unit; 112 — a second light emitting unit; 113 — a third light emitting unit;
121 — a first grating portion; 122 — second grating portion; 123-third grating part;
201 — first sub-pixel; 202-a second sub-pixel; 203-third sub-pixel;
120-grating flat plate; 30-chirped diffraction grating; 30A — a first diffraction grating;
30B — a second diffraction grating; 30C — a third diffraction grating; 30D — fourth diffraction grating.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The inventor of the application finds that the existing color mixing scheme has the problem of uneven light mixing, mainly because the existing backlight module can not provide reasonable light mixing distance. Because three kinds of monochromatic light are mixed into white light, a certain light mixing distance is needed, and the conventional backlight module is generally designed into a thin structure in order to meet the requirement of thinning, so that the monochromatic light only passes through the light mixing in a short distance, and the light mixing is insufficient, thereby causing the uneven light mixing. Although the uniformity can be improved to a certain extent by changing the arrangement of the three single-color Mini LEDs, effective color mixing cannot be achieved. The main structure of the conventional liquid crystal display device includes a display panel and a backlight module, the display panel includes an Array substrate (Array) and a Color Filter substrate (CF) of a Cell, and a liquid crystal layer is disposed between the Array substrate and the Color Filter substrate. The color film substrate comprises Black matrixes (Black Matrix) arranged at intervals and color light resistors arranged among the Black matrixes, wherein the color light resistors comprise red light resistors for forming red (R) sub-pixels, green light resistors for forming green (G) sub-pixels and blue light resistors for forming blue (B) sub-pixels, and are used for filtering transmitted light and transmitting only light of corresponding colors. Because the color photoresist has a certain amount of photoresist, when the white light emitted from the backlight module passes through the color photoresist, one third of the light energy is consumed, resulting in low light emitting efficiency and low light emitting brightness, i.e., low light utilization rate. In order to improve the display brightness, the output of the Mini LED needs to be increased, which leads to an increase in power consumption. Meanwhile, because the mixed light of the white light emitted by the existing backlight module is not uniform, the consumption of the white light transmitting the color photoresist is increased, the three-color peak value and the half-wave width of the transmitted light are influenced, and the color gamut of the emergent light is poor. Therefore, the existing color mixing scheme has the problems of uneven light mixing, low light utilization rate, large power consumption, poor color gamut and the like.
In order to solve the problems of uneven light mixing, low light utilization rate, large power consumption, poor color gamut and the like in the conventional color mixing scheme, the embodiment of the invention provides a display device. The main structure of the display device comprises a display panel and a backlight module, wherein the display panel comprises a plurality of pixel units which are arranged in a matrix, each pixel unit comprises M sub-pixels which are arranged periodically and respectively penetrate through different monochromatic light, the backlight module comprises a light emitting layer and a light modulation layer which are overlapped, the light emitting layer comprises a plurality of light source units which are arranged in the matrix, each light source unit comprises M light emitting units which are arranged periodically and respectively emit different monochromatic light, the light modulation layer is positioned above the surface of one side, adjacent to the display panel, of the light emitting layer, and is used for modulating the monochromatic light emitted by each light emitting unit into N light beams with different emission angles, and the N light beams respectively irradiate the N sub-pixels, the color of the emergent light of the light-emitting unit is the same as the color of the light transmitted by the N sub-pixels, M is a positive integer greater than or equal to 3, and N is a positive integer greater than or equal to 2.
The embodiment of the invention provides a display device, wherein a light modulation layer is arranged in a backlight module, the light modulation layer is used for modulating monochromatic light emitted by each light emitting unit into a plurality of light beams, the plurality of light beams are respectively incident into a plurality of sub-pixels which penetrate through the same color, and the monochromatic light is not required to be mixed, so that the problem of nonuniform mixed light is solved, the light utilization rate and the color gamut are improved, and the power consumption is reduced.
The technical solution of the embodiment of the present invention is explained in detail by the specific embodiment below.
First embodiment
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present invention, which illustrates a case where M is 3. As shown in fig. 1, the main structure of the display device of the present embodiment includes a backlight module 100 and a display panel 200. The display panel 200 includes a plurality of pixel units arranged in a matrix, each pixel unit includes a first sub-pixel 201, a second sub-pixel 202, and a third sub-pixel 203, which are periodically arranged, the three sub-pixels form a pixel unit P to form a pixel unit array, and the first sub-pixel 201, the second sub-pixel 202, and the third sub-pixel 203 are respectively configured to transmit first monochromatic light, second monochromatic light, and third monochromatic light. The backlight module 100 includes a backlight substrate 10, a light emitting layer 11 and a light modulation layer 12, wherein the light emitting layer 11 is disposed above a surface of the backlight substrate 10 facing the display panel 200, and the light modulation layer 12 is disposed above a surface of the light emitting layer 11 facing the display panel 200. The light emitting layer 11 includes a plurality of light source units arranged in a matrix on the backlight substrate 10, each light source unit includes a first light emitting unit 111, a second light emitting unit 112, and a third light emitting unit 113 arranged periodically, the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 are respectively configured to emit first monochromatic light, second monochromatic light, and third monochromatic light, and the three light emitting units constitute a light source unit B to form a light source unit array as a backlight of a liquid crystal display. In the structure shown in fig. 1, one light source unit B corresponds to two pixel units P, i.e., one light emitting unit corresponds to two sub-pixels. The light modulation layer 12 is configured to modulate the ith monochromatic light emitted by the ith light emitting unit into N light beams with different angles of emergence, and the N light beams are respectively emitted to the N ith sub-pixels. Where N is a positive integer greater than or equal to 2, and i is the first, second and third. In this embodiment, "a is located above the surface of B," a and B may be in direct contact, or a distance is provided between a and B. In addition, the "light beam" in the present embodiment refers to a light ray cluster having the same exit angle.
FIG. 2 is a schematic view of a light modulation layer according to a first embodiment of the present invention. As shown in fig. 2, the light modulation layer 12 of the present embodiment includes a grating plate 120, and a plurality of grating units arranged in a matrix on a surface of a side of the grating plate 120 facing (adjacent to) the light emitting layer 11, each grating unit includes a first grating portion 121, a second grating portion 122, and a third grating portion 123 arranged periodically, and the three grating portions constitute a grating unit G to form a grating unit array. In the present embodiment, one grating unit G corresponds to one light source unit B, that is, one grating unit G corresponds to two pixel units P, wherein the position of the first grating part 121 corresponds to the position of the first light emitting unit 111, the position of the second grating part 122 corresponds to the position of the second light emitting unit 112, and the position of the third grating part 123 corresponds to the position of the third light emitting unit 113. In this embodiment, the position correspondence means that the orthogonal projection of the grating portion on the backlight substrate includes the orthogonal projection of the light emitting unit on the substrate. The first grating portion 121 is configured to modulate a first monochromatic light emitted from the first light emitting unit 111 into N light beams with different exit angles, the N light beams respectively emit to the N first sub-pixels, the second grating portion 122 is configured to modulate a second monochromatic light emitted from the second light emitting unit 112 into N light beams with different exit angles, the N light beams respectively emit to the N second sub-pixels, the third grating portion 123 is configured to modulate a third monochromatic light emitted from the third light emitting unit 113 into N light beams with different exit angles, and the N light beams respectively emit to the N third sub-pixels.
In this embodiment, the first grating portion 121, the second grating portion 122, and the third grating portion 123 all adopt a chirped diffraction grating structure. The Diffraction Grating (Diffraction Grating) is a light splitting element, belonging to one of the gratings, and the Diffraction Grating can make the amplitude and phase of incident light undergo periodic spatial modulation by means of a regular structure, so that the light with different wavelengths under the same incident condition can be diffracted to different directions, and one incident monochromatic light can be split into a plurality of emergent lights. According to the optical principle, after light encounters an opaque or transparent obstacle or a small hole (narrow slit) in a propagation path, the phenomenon of off-line propagation around the obstacle is called diffraction of the light. Fig. 3 is a schematic structural view of a diffraction grating. The diffraction grating is formed by arranging a plurality of regularly arranged pits or bulges on the surface of a flat plate, the regularly arranged pits or bulges form a regular structure, and light which is transmitted in a straight line is deviated from the straight line transmission direction after passing through the pits. As shown in fig. 3, a plurality of pits or projections are formed on the surface of the transparent flat plate, and the pits or projections are regularly arranged, and have a width a as a light-transmitting region, and a width b as a light-non-transmitting region, thereby forming a diffraction grating having a grating period d, where d is a + b.
The deflection of light by the diffraction grating is determined by the following grating equation:
d(n*sinθm+sinθi)＝m*λ
i.e. thetam＝sin-1[(m*λ/d–sinθi)/n]
Wherein, thetamAngle of emergence of diffracted light, θiThe incident angle of the incident light is theta if the diffracted light and the incident light are on both sides of the normalm< 0, theta if the diffracted light is on the same side of the normal as the incident lightmAnd n is the refractive index of the grating flat plate, m is the diffraction order, lambda is the wavelength of incident light, and d is the grating period. In the grating equation, it is considered that incident light enters the diffraction grating from air (refractive index ═ 1).
According to the grating formula, the emergence angle thetamRespectively, with respect to the incident angle, the refractive index of the diffraction grating, the wavelength of the incident light and the grating period, wherein the exit angle thetamProportional to the wavelength λ of the incident light and inversely proportional to the grating period d. That is, the larger the grating period d, the larger the exit angle θmThe smaller the diffraction light direction deviates from the incident light direction, the smaller the grating period d and the exit angle thetamThe larger, i.e. the greater the degree to which the diffracted light direction deviates from the incident light direction.
Because the degree of the deviation of the diffraction light direction from the incident light direction is related to the grating period, the emergent angle can be changed by adjusting the grating period, diffraction gratings with different grating periods are arranged at different positions, and the emergent angles of the incident light at different positions after passing through the diffraction gratings with different grating periods are different, so that the chirped diffraction grating is formed. The term chirp was originally presented in the description of bird song-the pitch of bird song is variable, and in physics, chirp is often used to describe that a certain physical quantity is variable with time or position. In the present embodiment, "chirp" in a chirped diffraction grating is used to describe a structure in which the grating period changes with a change in spatial position. Fig. 4 is a schematic structural diagram of a chirped diffraction grating according to a first embodiment of the present invention, and an example of a grating portion is described. As shown in fig. 4, the grating section includes a grating plate 120, and a chirped diffraction grating 30 is formed on a surface (lower surface) of the grating plate 120 facing the light emitting unit. The chirped diffraction grating 30 includes a plurality of diffraction gratings that are sequentially arranged, and specifically includes: a first diffraction grating 30A located in zone 1, a second diffraction grating 30B located in zone 2, a third diffraction grating 30C located in zone 3, and a fourth diffraction grating 30D located in zone 4. The grating periods of the plurality of diffraction gratings are different, the grating period of the first diffraction grating 30A is greater than the grating period of the second diffraction grating 30B, the grating period of the second diffraction grating 30B is greater than the grating period of the third diffraction grating 30C, and the grating period of the third diffraction grating 30C is greater than the grating period of the fourth diffraction grating 30D. Each diffraction grating comprises a plurality of regularly arranged pits which are arranged on the surface of the grating flat plate 120, the widths of all the pits are the same, and the spaces between all the adjacent pits are the same, so that the grating periods of the gratings in each area are the same. Thus, four diffraction gratings having different grating periods and different positions are arranged to constitute the chirped diffraction grating 30.
Fig. 5 is a schematic diagram of light deflection of a chirped diffraction grating according to a first embodiment of the present invention, which is described based on the structure shown in fig. 4. In fig. 4, since the surface of the grating plate 120 facing the light emitting unit is perpendicular to the collimated light emitted from the light emitting unit, the plane of the chirped diffraction grating 30 formed in fig. 4 has an angle θ with the lower surface of the grating plate 120iSo that collimated light emitted from the light emitting unit has an incident angle thetai. In the present embodiment, the plane of the chirped diffraction grating 30 refers to a plane on which upper surfaces (or lower surfaces) of a plurality of regularly arranged pits or projections are located, the incident angle refers to an angle between the incident light direction and a normal O to the plane of the chirped diffraction grating 30, and the exit angle (diffraction angle) refers to an angle between the diffracted light direction and the normal O to the plane of the chirped diffraction grating 30. In this embodiment, the light emitting unit may adopt a Mini LED or an LED, and both of them can emit collimated light with better collimation. In addition, in order to improve the collimation, a light collimating structure may be disposed on the light source, and the light collimating structure is well known to those skilled in the art and will not be described herein.
As shown in fig. 4 and 5, the light emitting unit is outThe emitted collimated light rays have approximately the same incident angle thetaiIncident on the chirped diffraction grating 30 directly above it. Since the grating period of the diffraction grating located in the area 1 is larger than that of the diffraction grating located in the area 2, the exit angle θ of the diffracted light of the area 1 position range is larger than that of the diffraction grating located in the area 2 when the incident light is incident on the area 1 position range and the area 2 position range, respectivelym1The exit angle theta of diffracted light smaller than the range of the position of the area 2m2. Similarly, since the grating period of the diffraction grating located in the area 2 is larger than that of the diffraction grating located in the area 3, the exit angle θ of the diffracted light in the area 2 position range is larger than that in the area 3 position range when the incident light is incident on the area 2 position range and the area 3 position range, respectivelym2The exit angle theta of diffracted light smaller than the position range of the area 2m3. That is, the exit angle of the diffracted light has θm1<θm2<θm3The characteristic of (c). For a beam of incident monochromatic light, the chirped diffraction grating 30 diffracts the beam of monochromatic light into different directions using diffraction gratings having different grating periods formed at different positions. Since the grating period of the diffraction grating in each area is the same, the directions of the diffracted lights in the areas are the same, and a bundle of emergent lights in the same direction is formed. Thus, the chirped diffraction grating 30 of the present embodiment decomposes one incident monochromatic light into a plurality of outgoing lights having different directions.
Fig. 6 is a schematic diagram illustrating an operation of a display device according to a first embodiment of the present invention. As shown in fig. 6, the display panel includes a plurality of pixel units arranged in a matrix, each pixel unit includes a first subpixel 201, a second subpixel 202, and a third subpixel 203, i.e., M is 3, the light emitting layer includes a plurality of light source units arranged in a matrix, each light source unit includes a first light emitting unit 111, a second light emitting unit 112, and a third light emitting unit 113 arranged in a periodic manner, and the light modulation layer includes a plurality of grating units arranged in a matrix, each grating unit includes a first grating portion 121, a second grating portion 122, and a third grating portion 123 arranged in a periodic manner. One grating unit corresponds to one light source unit, and one grating unit (i.e., one light source unit) corresponds to three pixel units. In one grating unit, the position of the first grating part 121 corresponds to the position of the first light emitting unit 111, the position of the second grating part 122 corresponds to the position of the second light emitting unit 112, and the position of the third grating part 123 corresponds to the position of the third light emitting unit 113. Meanwhile, in one raster unit, the position of each raster portion corresponds to the position of one pixel unit, that is, each raster portion corresponds to the positions of three sub-pixels. In this embodiment, only an example is given in which one light source unit corresponds to three pixel unit positions, that is, N is 3, and in practical implementation, each light source unit may correspond to two, four, five, or more pixel units, a plurality of pixel units corresponding to one light source unit position may be used as a pixel unit group, and the central position of the grating portion may correspond to the central position of the pixel unit group.
In this embodiment, each grating portion includes 3 diffraction gratings with different positions and different grating periods, so that monochromatic light emitted from each light emitting unit forms 3 light beams in different directions, and the 3 light beams respectively enter 3 sub-pixels with the same color. Specifically, the first monochromatic light (solid line) emitted from the first light-emitting unit 111 passes through the first grating 121 and then enters the first sub-pixels 201 in 3 pixel units, respectively. The second monochromatic light (dashed line) emitted from the second light emitting unit 112 passes through the second grating portion 122 and then enters the second sub-pixels 202 in the 3 pixel units, respectively. The third monochromatic light (dot-dash line) emitted from the third light emitting unit 113 passes through the third grating 123 and then enters the third sub-pixels 203 of the 3 pixel units, respectively. It should be noted that, in the embodiment, most of the red light (taking red as an example) emitted by the light emitting unit is diffracted into the red sub-pixel, a small amount of red light may be incident on the blue sub-pixel or the green sub-pixel, and similarly, the light incident on the red sub-pixel also has blue light or green light, but the blue light or the green light is filtered by the red photoresist of the red sub-pixel, and only the red light passes through the red sub-pixel. Therefore, most emergent light of one color is diffracted to the sub-pixels which penetrate through the monochromatic light, namely, in the incident light of each sub-pixel, most incident light is the monochromatic light which the sub-pixel should penetrate through, and a small part of the incident light is other monochromatic light which the sub-pixel should filter out, so that the filtered light quantity is reduced, the light transmission quantity is increased, the light energy loss is reduced, and the light utilization rate and the color gamut are greatly improved. Under the same display brightness, the output power of the light-emitting unit can be reduced, and further the power consumption is reduced.
As shown in fig. 5 and 6, the relationship between the incident angle and the exit angle can also be written as:
θm＝90°-θi-αm
tanαm＝h/(Pitchlight emitting unit3-5/N)) or alpham＝arctan[h/(PitchLight emitting unit*(3-5/N)]
Wherein h is the thickness of the grating plate, PitchLight emitting unitN is the number of pixel unit groups corresponding to one light source unit, and is the pitch between the light emitting units.
As can be seen from the above equation, the minimum value of the grating period is determined by the maximum diffraction angle, and taking red light as an example, the refractive index n is 1.5, the diffraction order m is 1, and the incident angle θ isi5 DEG, red wavelength lambda 0.63 mu m, Pitch Light emitting unit200 μm, N3, the minimum value d of the grating periodmin1.8 μm. The maximum value of the grating period is determined by the minimum diffraction angle, taking red light as an example, assuming that the light has almost no deflection, and the minimum limit deflection angle is 1 degree, the maximum value d of the grating period ismax＝37μm。
It should be noted that, although the pits are used to form the grating as an example, and the protrusions between the pits correspond to two states of transmission and shielding, in practical implementation, the structure is not limited to the pit or protrusion structure and the two states of transmission and shielding, and other structures for forming the grating may be adopted, and the embodiment is not limited in particular. In addition, the size range of the pits or the bulges can be designed according to actual needs, and the width of the pits is close to the grating period as much as possible, so that the light energy utilization rate is improved.
In this embodiment, the plane of the chirped diffraction grating 30 and the lower surface of the grating plate 120 form an included angle θiThe example is described, but in practice, the chirped diffraction grating 30 may be directly disposed on the lower surface of the grating plate 120, i.e. chirped diffraction gratingThe plane of the raster 30 forms an angle theta with the lower surface of the raster plate 120i0. The configuration shown in fig. 6 provides the chirped diffraction grating 30 as a slanted surface, i.e., thetaiIs > 0 because the exit angle theta is adjusted by adjusting the grating period d according to the grating formulamThe diffraction light can be positive or negative, when the exit angle is positive, the diffraction light is on the same side of the normal with the incident light, and when the exit angle is negative, the diffraction light is on both sides of the normal with the incident light. As shown in fig. 6, the light emitted from the second light emitting unit 112 passes through the second grating portion 122, and then has both left and right deflected light. If theta is setiWhen the grating period is changed, the size of the exit angle can only be changed according to the grating formula, but the positive and negative of the exit angle cannot be changed, that is, the light can only be deflected in one direction. In practice, the angle θ between the plane of the diffraction gratings and the surface of the grating plateiAnd may be set to 0 deg. to 20 deg.. Within the range of the included angle, the light beams modulated by the chirped diffraction gratings at different positions can be directed to a plurality of sub-pixels.
In the actual application scene design, the position of each sub-pixel of the display panel is determined, and the distance between the chirped diffraction grating and the display panel is also determined, so that the direction of emergent light can be accurately designed through professional optical simulation software. Taking the example that the first light-emitting unit emits the first monochromatic light, the first grating portion makes the first monochromatic light into 3 light beams, and the 3 light beams respectively emit to the 3 first sub-pixels, assuming that the light beam at the position of the area 1 emits to the sub-pixel 1, the light beam at the position of the area 2 emits to the sub-pixel 2, and the light beam at the position of the area 3 emits to the sub-pixel 3, the emission angles of the area 1, the area 2, and the area 3 can be determined according to the position of the sub-pixel, the position of the area, and the distance between the chirped diffraction grating and the display panel. Thus, the exit angle, the refractive index of the diffraction grating, the diffraction order and the wavelength of the incident light in the grating equation are known, that is, the grating period that the region 1, the region 2 and the region 3 should have can be known under a set incident angle, and by designing the grating period, the first monochromatic light can be emitted in the designed light emission direction after passing through the chirped diffraction grating, so that the light beam at the position of the region 1 is emitted to the sub-pixel 1, the light beam at the position of the region 2 is emitted to the sub-pixel 2, and the light beam at the position of the region 3 is emitted to the sub-pixel 3. Of course, factors such as refraction and reflection of the multilayer medium exist in the light transmission process, and can also be considered in optical simulation to realize accurate design. After the grating period of each area is designed according to the light-emitting direction, pits or protrusions can be formed on the surface of the grating flat plate by adopting the processes of chemical etching, exposure development, plasma etching and the like.
In practical implementation, the backlight module 100 may further include a diffusion layer 13, where the diffusion layer 13 is located above a surface of the light modulation layer 12 facing the display panel, and is used for sufficiently scattering the transmitted light and then facing the sub-pixels of the display panel.
Fig. 7 is an overall schematic view of a display device according to a first embodiment of the invention. As shown in fig. 7, the overall structure of the display device includes a light emitting layer 11, a light modulation layer 12, a diffusion layer 13, and a display panel 200, the light emitting layer 11 includes a light source unit array disposed on a backlight substrate as a backlight of a liquid crystal display, the light modulation layer 12 includes a grating unit array disposed on a surface of a side facing the light emitting layer 11, the display panel 200 of the uppermost layer includes a pixel unit array, and the diffusion layer 13 is disposed between the light modulation layer 12 and the display panel 200. The position of one grating unit corresponds to the position of one light source unit, and corresponds to the position of one pixel unit (three sub-pixels). In practical implementation, the Light modulation layer 12 and the Light emitting layer 11 may be directly contacted, and both are stacked, and the edges are fastened and fixed by using a metal Back plate and a plastic frame, similar to the structure design of a conventional backlight Unit (BLU), the diffusion layer 13 is directly contacted with the Light modulation layer 12, and the display panel 200 is directly contacted with the diffusion layer 13, and stacked. The display panel 200 includes an array substrate and a color film substrate which are arranged oppositely, and a liquid crystal layer is arranged between the array substrate and the color film substrate, the array substrate includes a first substrate and an array structure layer arranged on the first substrate, the array structure layer includes a gate line, a data line, a thin film transistor and a pixel electrode, and is used for forming an electric field for driving liquid crystal to deflect. The color film substrate comprises a second substrate and a color film structure layer arranged on the first substrate, the color film structure layer comprises black matrixes arranged at intervals and color light resistors arranged between the black matrixes, and the color light resistors comprise red light resistors for forming red sub-pixels, green light resistors for forming green sub-pixels and blue light resistors for forming blue sub-pixels and are used for filtering transmitted light and only transmitting light of corresponding colors. Although the light splitting is realized through the chirped diffraction grating, the chirped diffraction grating has a certain resolution limit, and the monochromatic backlight is difficult to be completely aligned with the monochromatic sub-pixels in consideration of the assembly tolerance of the mechanical structure, so that the light extraction purity is ensured through the filtering of the color photoresist.
Although the embodiment has been described by taking an example that light emitted from one light emitting unit respectively enters 3 sub-pixels, in practical implementation, light emitted from one light emitting unit can enter 4, 5, or even 6 sub-pixels on the premise of ensuring brightness. In addition, one pixel unit may include three sub-pixels or four sub-pixels, and the arrangement of the sub-pixels may also adopt other arrangements, such as a delta arrangement. Because one light-emitting unit corresponds to a plurality of pixel units, and the light emitted by one light-emitting unit is respectively incident into a plurality of sub-pixels with the same color, the number of the light-emitting units is effectively reduced, the power consumption can be further reduced, and the cost can be reduced.
In this embodiment, the light emitting unit may be a Mini LED or an LED. The first monochromatic light is red light, the second monochromatic light is green light, the third monochromatic light is blue light, namely the first light emitting unit is a red Mini LED for emitting red light, the second light emitting unit is a green Mini LED for emitting green light, and the third light emitting unit is a blue Mini LED for emitting blue light. Correspondingly, the first sub-pixel, the second sub-pixel and the third sub-pixel are respectively a red sub-pixel, a green sub-pixel and a blue sub-pixel. The Mini LED has the advantages of high contrast, high brightness, high yield, special-shaped cutting characteristic, better color rendering, more precise HDR partition and the like, does not need structures such as a light guide plate, a reflector plate and the like, and is favorable for lightening and thinning of the display device.
In this embodiment, the grating plate may be made of transparent plastic material, such as polymethyl methacrylate PMMA, styrene-methyl methacrylate copolymer MS, or polycarbonate PC. The chirped diffraction grating can be formed by preparing salient points or pits on the surface of the transparent plastic material in a chemical etching, exposure development or plasma etching mode.
The display device provided by the embodiment of the invention can be as follows: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It can be seen from the above-mentioned scheme of this embodiment, this embodiment is through setting up the light modulation layer between luminescent layer and display panel, the luminescent layer adopts the luminescence unit of a plurality of emergent monochromatic lights, the light modulation layer adopts the chirp diffraction grating structure, the monochromatic light that every luminescence unit emergent is modulated into the light beam that a plurality of emergence angles are different to the chirp diffraction grating structure, a plurality of light beams incide respectively and see through a plurality of sub-pixels of the same colour, match through the colour of monochromatic Mini LED with sub-pixel, utilize the narrow spectral width characteristic of monochromatic Mini LED, not only need not mix the light to monochromatic light, the inhomogeneous problem of mixed light has been eliminated, and reduced light energy loss, increased the light transmission volume, light utilization rate and colour gamut have been improved. Under the same display brightness, the output power of the light-emitting unit can be reduced, and the power consumption is further reduced.
Second embodiment
FIG. 8 is a schematic view of a light modulation layer according to a second embodiment of the present invention. This embodiment is an extension of the first embodiment described above. As shown in fig. 8, the light modulation layer 12 of the present embodiment includes a grating plate 120, and a plurality of grating units arranged in a matrix on a side surface (upper surface) of the grating plate 120 away from the light emitting layer 11, each grating unit includes a first grating portion 121, a second grating portion 122, and a third grating portion 123 arranged periodically, and the plurality of grating units form a grating unit array. The first grating portion 121 is configured to modulate a first monochromatic light emitted from the first light emitting unit into N light beams with different exit angles, the N light beams are respectively emitted to the N first sub-pixels, the second grating portion 122 is configured to modulate a second monochromatic light emitted from the second light emitting unit into N light beams with different exit angles, the N light beams are respectively emitted to the N second sub-pixels, the third grating portion 123 is configured to modulate a third monochromatic light emitted from the third light emitting unit into N light beams with different exit angles, and the N light beams are respectively emitted to the N third sub-pixels.
In this embodiment, the corresponding grating formula is: d (sin θ)m+n*sinθi)＝m*λ
Since the chirped diffraction grating of this embodiment is disposed on the upper surface of the grating plate, and light is deflected from the upper surface, a certain distance needs to be left between the upper surface of the grating plate and the diffusion layer above the grating plate to ensure that light passing through the chirped diffraction grating can be incident on the corresponding sub-pixel. The working principle of the chirped diffraction grating and the contents of splitting one beam of incident monochromatic light into multiple beams of emergent light in different directions in this embodiment are the same as those in the foregoing embodiment, and are not described here again.
Third embodiment
Based on the technical concept of the invention, the invention also provides a backlight module, which comprises a light emitting layer and a light modulation layer which are overlapped, wherein the light emitting layer comprises a plurality of light source units which are arranged in a matrix, each light source unit comprises M light emitting units which are periodically arranged and respectively emit different monochromatic light, the light modulation layer is used for modulating the monochromatic light emitted by each light emitting unit into N light beams with different emergent angles, and each light beam has a set emergent direction; wherein M is a positive integer greater than or equal to 3, and N is a positive integer greater than or equal to 2.
Fig. 9 is a schematic structural diagram of a backlight module according to an embodiment of the invention, which illustrates a case where M is 3. As shown in fig. 9, the backlight module of this embodiment includes a backlight substrate 10, a light-emitting layer 11 and a light modulation layer 12, wherein the light-emitting layer 11 is disposed on the backlight substrate 10, and the light modulation layer 12 is disposed above a surface of the light-emitting layer 11 away from the backlight substrate 10. The light emitting layer 11 includes a plurality of light source units arranged in a matrix on the backlight substrate 10, each of the light source units includes a first light emitting unit 111, a second light emitting unit 112, and a third light emitting unit 113 arranged periodically, the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 are used to emit first monochromatic light, second monochromatic light, and third monochromatic light, respectively, and the plurality of light source units form a light source unit array as a backlight. The light modulation layer 12 is configured to modulate the ith monochromatic light emitted from the ith light emitting unit into N light beams, where the N light beams have a predetermined emission direction.
In one embodiment, the light modulation layer 12 includes a grating plate 120, and a plurality of light source units arranged in a matrix on a surface of the grating plate 120 facing the light emitting layer 11, each light source unit including a first grating portion 121, a second grating portion 122, and a third grating portion 123 arranged periodically, the plurality of grating units forming a grating unit array. In another embodiment structure, the first grating part 121, the second grating part 122 and the third grating part 123 are disposed on a surface of the grating plate 120 on a side away from the light-emitting layer 11. One grating unit corresponds to one light source unit, the position of the first grating part 121 corresponds to the position of the first light emitting unit 111, the position of the second grating part 122 corresponds to the position of the second light emitting unit 112, and the position of the third grating part 123 corresponds to the position of the third light emitting unit 113. The first grating portion 121 is configured to modulate a first monochromatic light emitted from the first light emitting unit 111 into N light beams with different exit angles, the N light beams emit to different directions, the second grating portion 122 is configured to modulate a second monochromatic light emitted from the second light emitting unit 112 into N light beams with different exit angles, the N light beams emit to different directions, the third grating portion 123 is configured to modulate a third monochromatic light emitted from the third light emitting unit 113 into N light beams with different exit angles, and the N light beams emit to different directions.
The first grating part 121, the second grating part 122 and the third grating part 123 all adopt a chirped diffraction grating structure. The chirped diffraction grating comprises a plurality of diffraction gratings which are arranged in sequence, the grating periods of the diffraction gratings are different, each diffraction grating comprises a plurality of pits which are regularly arranged and are formed in the surface of the grating flat plate 120, the widths of all the pits are the same, the intervals between all the adjacent pits are the same, and the grating periods of the gratings in all the areas are the same. The planes of the diffraction gratings form an included angle theta with the surface of the grating flat platei，θi0 to 20 degrees. Structure and work principle of chirp diffraction gratingThe contents of processing and decomposing an incident monochromatic light beam into a plurality of emergent light beams with different directions have been described in detail in the foregoing embodiments, and are not described herein again.
Because each grating part comprises a plurality of diffraction gratings with different positions and grating periods, monochromatic light emitted by each light emitting unit forms a plurality of set emitting directions, and the set emitting directions can be set according to actual needs, such as sub-pixels emitted to a certain position in the display panel.
In practical implementation, the backlight module may further include a diffusion layer 13, where the diffusion layer 13 is located above a surface of the light modulation layer 12 away from the backlight substrate 10, and is used for fully scattering the transmitted light and then directing the light to the sub-pixels of the display panel.
The light emitting units can adopt Mini LEDs, the first monochromatic light is red light, the second monochromatic light is green light, the third monochromatic light is blue light, namely the first light emitting unit is a red Mini LED for emitting red light, the second light emitting unit is a green Mini LED for emitting green light, and the third light emitting unit is a blue Mini LED for emitting blue light. The Mini LED has the advantages of high contrast, high brightness, high yield, special-shaped cutting characteristic, better color rendering, more precise HDR partition and the like, does not need structures such as a light guide plate, a reflector plate and the like, and is favorable for lightening and thinning of the display device.
The grating plate can be made of transparent plastic materials, such as polymethyl methacrylate (PMMA), styrene-methyl methacrylate copolymer (MS) or Polycarbonate (PC). The chirped diffraction grating can be formed by preparing salient points or pits on the surface of the transparent plastic material in a chemical etching mode, an exposure development mode, a plasma etching mode or the like.
It can be seen from the above-mentioned scheme of this embodiment, this embodiment is through luminescent layer and light modulation layer structure, the luminescent layer adopts the luminescence unit of a plurality of emergent monochromatic lights, light modulation layer adopts chirp diffraction grating structure, chirp diffraction grating structure modulates the monochromatic light of every luminescence unit emergent into a plurality of light beams, a plurality of light beams radiate respectively to a plurality of directions, need not mix the light to monochromatic light, eliminated and mixed inhomogeneous problem of light, reduced light energy loss, increased the light transmission amount, improved light utilization ratio and colour gamut. Under the same display brightness, the output power of the light-emitting unit can be reduced, and the power consumption is further reduced.
In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. The utility model provides a display device, a serial communication port, including display panel and backlight unit, display panel includes a plurality of pixel units that the matrix was arranged, and every pixel unit includes that the difference of periodic arrangement sees through a plurality of sub-pixels of different monochromatic light, backlight unit is including overlapping luminous layer and the light modulation layer of establishing, the luminous layer includes a plurality of light source unit that the matrix was arranged, and every light source unit includes a plurality of light emitting unit of periodic arrangement's the different monochromatic light of difference outgoing, the light modulation layer is located the luminous layer is adjacent the top of display panel side surface, the light modulation layer is used for modulating the monochromatic light of every light emitting unit outgoing into a plurality of light beams that the angle of departure is different, and a plurality of light beams are respectively to N sub-pixels of monochromatic light, the colour of luminous unit outgoing light with a plurality of sub-pixels of the colour of light that sees through, M is for being more than or equal to 3 positive integer, n is a positive integer greater than or equal to 2;
the light modulation layer comprises a grating flat plate and a plurality of grating units which are arranged on the grating flat plate and arranged in a matrix manner, each grating unit comprises M grating parts which are arranged periodically, the position of one grating part in the M grating parts corresponds to the position of one light emitting unit in the M light emitting units, and each grating part is used for modulating monochromatic light emitted by the corresponding light emitting unit into N light beams with different emergence angles;
each grating part comprises a plurality of diffraction gratings with different grating periods which are arranged in sequence, and each diffraction grating is used for modulating monochromatic light emitted by the light emitting unit into a light beam; the planes of the diffraction gratings and the surface of the grating flat plate form an included angle thetai，θiThe angle is 0-20 degrees to change the positive and negative of the emergent angle of the light beam;
wherein, the light-emitting unit comprises a submillimeter light-emitting diode Mini LED.
2. The display device according to claim 1, wherein the M grating portions are provided on a surface of the grating plate on a side adjacent to the light-emitting layer or on a surface of the grating plate on a side away from the light-emitting layer.
3. The display device according to claim 1, wherein the material of the light modulation layer comprises polymethyl methacrylate, styrene-methyl methacrylate copolymer, or polycarbonate, and each diffraction grating comprises a plurality of regularly arranged pits or projections formed on the surface of the grating plate, and the widths of the plurality of pits or projections are the same.
4. The display device according to claim 1, further comprising a diffusion layer over a surface of the light modulation layer adjacent to a side of the display panel.
5. The display device according to any one of claims 1 to 4, wherein the M sub-pixels include a first sub-pixel transmitting the first monochromatic light, a second sub-pixel transmitting the second monochromatic light, and a third sub-pixel transmitting the third monochromatic light; the M light emitting units comprise a first light emitting unit emitting first monochromatic light, a second light emitting unit emitting second monochromatic light and a third light emitting unit emitting third monochromatic light; the light modulation layer is used for modulating the first monochromatic light of first luminescence unit outgoing into N light beams, and N light beams respectively shoot to N first sub-pixels, will the second monochromatic light of second luminescence unit outgoing is modulated into N light beams, and N light beams respectively shoot to N second sub-pixels, will the third monochromatic light of third luminescence unit outgoing is modulated into N light beams, and N light beams shoot to N third sub-pixels respectively.
6. The display device according to claim 5, wherein the first monochromatic light comprises red light, the second monochromatic light comprises green light, the third monochromatic light comprises blue light, and N is 2-6.
7. The backlight module is characterized by comprising a light emitting layer and a light modulation layer which are stacked, wherein the light emitting layer comprises a plurality of light source units which are arranged in a matrix, each light source unit comprises M light emitting units which are arranged periodically and respectively emit different monochromatic light, and the light modulation layer is used for modulating the monochromatic light emitted by each light emitting unit into N light beams with different emergent angles; wherein M is a positive integer greater than or equal to 3, and N is a positive integer greater than or equal to 2;
the light modulation layer comprises a grating flat plate and a plurality of grating units which are arranged on the grating flat plate and arranged in a matrix manner, each grating unit comprises M grating parts which are arranged periodically, the position of one grating part in the M grating parts corresponds to the position of one light emitting unit in the M light emitting units, and each grating part is used for modulating monochromatic light emitted by the corresponding light emitting unit into N light beams with different emergence angles;
each grating part comprises a plurality of diffraction gratings with different grating periods which are arranged in sequence, and each diffraction grating is used for modulating monochromatic light emitted by the light emitting unit into a light beam; the planes of the diffraction gratings and the surface of the grating flat plate form an included angle thetai，θiThe angle is 0-20 degrees to change the positive and negative of the emergent angle of the light beam;
wherein, the light-emitting unit comprises a sub-millimeter light-emitting diode Mini LED.
8. The backlight module according to claim 7, wherein the M grating portions are disposed on a surface of the grating plate adjacent to the light emitting layer or a surface of the grating plate away from the light emitting layer.
9. The backlight module as claimed in claim 7, wherein the light modulation layer is made of polymethyl methacrylate, styrene-methyl methacrylate copolymer or polycarbonate, each diffraction grating comprises a plurality of regularly arranged pits or protrusions formed on the surface of the grating plate, and the width of the pits or protrusions is the same.
10. The backlight module according to claim 7, further comprising a diffusion layer over a surface of the light modulation layer on a side away from the light-emitting layer.
11. The backlight module according to any one of claims 7 to 10, wherein the M light emitting units comprise a first light emitting unit emitting a first monochromatic light, a second light emitting unit emitting a second monochromatic light, and a third light emitting unit emitting a third monochromatic light; the first monochromatic light comprises red light, the second monochromatic light comprises green light, and the third monochromatic light comprises blue light; n is 2-6.
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| CN110750009A (en) * | 2019-10-31 | 2020-02-04 | 厦门天马微电子有限公司 | Display device |
| CN113281940B (en) * | 2021-07-23 | 2021-09-24 | 成都工业学院 | High-resolution display device based on super surface |
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| CN109212834A (en) * | 2018-11-08 | 2019-01-15 | 京东方科技集团股份有限公司 | A kind of display panel, display device and driving method |
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| CN109709720A (en) | 2019-05-03 |
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