CN110308589B

CN110308589B - Manufacturing method of light-emitting device, backlight module and display device

Info

Publication number: CN110308589B
Application number: CN201910579092.6A
Authority: CN
Inventors: 周可熊
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2023-05-05
Anticipated expiration: 2039-06-28
Also published as: CN110308589A

Abstract

The embodiment of the invention discloses a manufacturing method of a light-emitting device, the light-emitting device, a backlight module and a display device, wherein the manufacturing method of the light-emitting device comprises the following steps: providing a substrate; forming a plurality of light emitting elements on one side of a substrate; the light emitting elements are provided with a plurality of different color blocks and a plurality of different dominant wavelength ranges, and the different color blocks and the different dominant wavelength ranges correspond to light of the same color; using two adjacent light-emitting elements as a light-emitting element group; the average value of chromaticity of color blocks of two light-emitting elements of the same light-emitting element group is within a first threshold range, and the average value of dominant wavelengths of dominant wavelength ranges of two light-emitting elements of the same light-emitting element group is within a second threshold range. The technical scheme provided by the embodiment of the invention is beneficial to ensuring higher brightness and contrast while reducing the fluctuation range of the white point coordinates so as to ensure better user experience of a user.

Description

Manufacturing method of light-emitting device, backlight module and display device

Technical Field

The invention relates to the technical field of display, in particular to a manufacturing method of a light-emitting device, the light-emitting device, a backlight module and a display device.

Background

With the development of display technology, the requirements of users on the display are also increasing. In actual production, the smaller the performance fluctuation of the display is, the easier the production cost is reduced on the premise of meeting the user requirement. For the color rendering performance of the display, taking a liquid crystal display device as an example, the color rendering performance is determined by a light emitting device in the backlight module and an optical element of the liquid crystal display panel, and the light emitting device may include a plurality of light emitting elements.

Generally, in a liquid crystal display device, the same optical element of a liquid crystal display panel may correspond to light emitting elements of several different color patches to reduce production cost, but this may result in large fluctuation of eight-point coordinates of the display device as well. To solve this problem, white point correction is generally performed using gamma curves. However, the brightness and contrast of the liquid crystal display device may be lost, resulting in a reduced user experience.

Disclosure of Invention

The embodiment of the invention provides a manufacturing method of a light-emitting device, the light-emitting device, a backlight module and a display device, which are used for reducing the fluctuation range of white point coordinates and simultaneously ensuring higher brightness and contrast so as to ensure better user experience of a user.

In a first aspect, an embodiment of the present invention provides a method for manufacturing a light emitting device, including:

providing a substrate;

forming a plurality of light emitting elements on one side of the substrate;

the light emitting elements are provided with a plurality of different color blocks and a plurality of different dominant wavelength ranges, and the plurality of different color blocks and the plurality of different dominant wavelength ranges correspond to light of the same color; taking two adjacent light-emitting elements as a light-emitting element group; the average value of chromaticity of color blocks of two light-emitting elements of the same light-emitting element group is within a first threshold range, and the average value of dominant wavelengths of dominant wavelength ranges of two light-emitting elements of the same light-emitting element group is within a second threshold range.

In a second aspect, an embodiment of the present invention further provides a light emitting device, including:

a substrate base;

a plurality of light emitting elements formed on one side of the substrate;

In a third aspect, an embodiment of the present invention further provides a backlight module, including any one of the light emitting devices provided in the second aspect.

In a fourth aspect, an embodiment of the present invention further provides a display apparatus, including a backlight module provided by the third invention;

the display also comprises a liquid crystal display panel;

the liquid crystal display panel is arranged on the light emitting side of the backlight module.

In a fifth aspect, an embodiment of the present invention further provides a display device, including any one of the light emitting devices provided in the second aspect.

According to the manufacturing method of the light-emitting device, the plurality of light-emitting elements are arranged in the plurality of light-emitting elements formed on one side of the substrate, and each light-emitting element is provided with a plurality of different color blocks and a plurality of different dominant wavelength ranges, and the plurality of different color blocks and the plurality of different dominant wavelength ranges correspond to light of the same color; using two adjacent light-emitting elements as a light-emitting element group; the average value of chromaticity of color blocks of two light-emitting elements of the same light-emitting element group is within a first threshold range, and the average value of dominant wavelengths of dominant wavelength ranges of two light-emitting elements of the same light-emitting element group is within a second threshold range. The main wavelength range of the light-emitting elements of the same light-emitting element group is matched while the color blocks of the light-emitting elements are matched, so that the main wavelength range can be converged to a smaller fluctuation range while the color coordinates are converged to the smaller fluctuation range; the fluctuation range of the dominant wavelength can be reduced, so that the problem of large fluctuation of white point coordinates caused by large fluctuation of the dominant wavelength can be avoided; meanwhile, white point correction is not needed through gamma curve. Therefore, the fluctuation range of white point coordinates can be reduced, and meanwhile, the display brightness and the display contrast ratio are not lost, so that the display picture can be ensured to have higher brightness and contrast ratio, and the user can be ensured to have better user experience.

Drawings

Fig. 1 is a schematic flow chart of a method for manufacturing a light emitting device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a color block dividing and matching method according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a dominant wavelength determination method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a spectrum range according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a dominant wavelength division and matching method according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating a method for manufacturing another light emitting device according to an embodiment of the present invention;

fig. 8 is a flowchart of a method for manufacturing a light emitting device according to another embodiment of the present invention;

fig. 9 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of another light emitting device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of another light emitting device according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of another light emitting device according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention;

FIG. 16 is a graph showing the comparison of the fluctuation range of white points of a display device according to an embodiment of the present invention;

fig. 17 is a schematic view of a color coordinate range of a backlight module according to an embodiment of the present invention;

FIG. 18 is a graph showing the comparison of the fluctuation range of white points of another display device according to an embodiment of the present invention;

fig. 19 is a schematic view of the white point fluctuation range of a display device formed by fig. 17.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.

Fig. 1 is a flow chart of a method for manufacturing a light emitting device according to an embodiment of the invention. Referring to fig. 1, the manufacturing method includes:

s110, providing a substrate base plate.

Wherein, the substrate can be a rigid substrate or a flexible substrate; the rigid substrate may include a glass substrate or a silicon substrate, and the flexible substrate may include a polyimide substrate or a stainless steel substrate. The substrate may also be other types of substrate known to those skilled in the art, and embodiments of the present invention are not limited in this regard.

The substrate may include, in addition to a substrate, a circuit structure for driving the light emitting element to operate normally, for example, an integrated driving circuit, a scan driving circuit, a pixel driving circuit, or other circuit structures known to those skilled in the art, which is not limited in the embodiment of the present invention.

The step may be cleaning, drying, forming a circuit structure according to a process, and other processes known to those skilled in the art, which are not limited in this embodiment of the present invention.

S120, forming a plurality of light-emitting elements on one side of the substrate.

Wherein the step may include electrically connecting a plurality of light emitting elements that are physically independent to one side surface of the substrate base plate. Exemplary electrical connections may include bonding, wire bonding, adhesive, or other electrical connections known to those skilled in the art, and embodiments of the present invention are not limited in this regard.

For example, referring to fig. 2, a plurality of light emitting elements 910 are formed on one side of a substrate base 900.

The light emitting elements have different color blocks and different dominant wavelength ranges, and the different color blocks and the different dominant wavelength ranges correspond to the same color light. The light corresponding to the plurality of light emitting elements may be blue light, red light, green light or other colors known to those skilled in the art, which is not limited by the embodiment of the present invention.

Wherein both color blocks and dominant wavelengths may be defined in the chromaticity diagram.

By way of example, a color patch may be understood a set of color coordinates within a region of a chromaticity diagram, which may be embodied as a polygonal region in the chromaticity diagram. Six color patches in the form of quadrilaterals are shown in fig. 3, 201, 202, 203, 204, 205 and 206, respectively, or may be represented by A, B, C, D, E and F, respectively, and the color patch structure may be represented by 20. In other embodiments, the color coordinates of the light emitting elements may be divided into other shapes or numbers of color patches according to the requirements of the manufacturing method of the light emitting device, which is not limited in the embodiment of the present invention.

By way of example, the dominant wavelength is understood to be the wavelength to which the eye sees the color of the primary light emitted by the light source (i.e., the light emitting element). Taking the chromaticity diagram 300 shown in FIG. 4 as an example, in chromaticity diagram 300, first, a selected standard white point light source, a conventionally selected D65 light source, whose color coordinates are as in O (x) in FIG. 4 ₀ ,y ₀ ) Shown; then, the intersection point of the extension line or the reverse extension line and the horseshoe-shaped boundary represents the dominant wavelength corresponding to the target coordinate point by connecting the target coordinate point with the color coordinates of the standard white point light source and extending.

Exemplary, two target coordinate points, P (x ₁ ,y ₁ ) And Q (x) ₂ ,y ₂ ) The intersection point P10 of the extension line and the horseshoe-shaped boundary is the dominant wavelength corresponding to the point P by connecting the point O and the point P and extending; and the intersection point Q10 of the reverse extension line and the horseshoe-shaped boundary is the dominant wavelength corresponding to the Q point by connecting the O point and the Q point and extending.

It should be noted that, fig. 4 only shows the horseshoe-shaped boundary in the chromaticity diagram 300, but does not show the color distribution inside the horseshoe-shaped, and the color distribution inside the horseshoe-shaped boundary is known to those skilled in the art, which is not repeated and limited in the embodiment of the present invention.

In addition, it should be noted that the color lump structure 20 shown in fig. 3 is an enlarged partial area of the chromaticity diagram shown in fig. 4, and the partial area may be selected according to the color coordinate distribution range of the light emitting element, and may be in a red light area, a green light area, a blue light area, or a white light area, which is not limited in the embodiment of the present invention.

Illustratively, with continued reference to FIG. 2, two adjacent light-emitting elements 910 are provided as a light-emitting element group 920; the average chromaticity value of the color patches of the two light-emitting elements 910 of the same light-emitting element group 920 is within a first threshold range, and the average dominant wavelength value of the dominant wavelength ranges of the two light-emitting elements 910 of the same light-emitting element group 920 is within a second threshold range.

Wherein, one color block is used as a chromaticity bin area, and different color blocks are used as different chromaticity bin areas; one dominant wavelength range is taken as a band bin region and different dominant wavelength ranges are taken as different band bin regions. Then, the two light emitting elements 910 of the same light emitting element group 920 can implement the band mixing bin while chromaticity mixing bin; in this way, the color coordinate range and the dominant wavelength range of the same light emitting element group 920 are converged to the intermediate values thereof with respect to the color coordinate range and the dominant wavelength range of the two light emitting elements 910 in the light emitting element group 920. Thus, the main wavelength fluctuation range can be reduced, which is beneficial to reducing the white point fluctuation range of the light-emitting device.

The first threshold range is related to the division manner of the color blocks and the chroma blend bin manner, for example, when the areas covered by each color block in the chromaticity diagram are the same, and for the chroma blend bin manner of M1 and N1, the first threshold range can be understood as N1/M1 where the size of the color block area represented by the light emitting device converges to the size of the color block area represented by all the light emitting elements. The second threshold range relates to a division manner of the dominant wavelength range and a band mixing manner, and for example, when the dominant wavelength span of each dominant wavelength range is the same (for example, 2 nm), for the band mixing manner of M2 and N2, the second threshold range may be understood as N2/M2 in which the size of the dominant wavelength range represented by the light emitting device converges to the size of the dominant wavelength range represented by all the light emitting elements. Typically, M1, N1, M2, and N2 are positive integers greater than 0.

It should be noted that "all light emitting elements" in the previous paragraph may be understood as light emitting elements covering M1 color block ranges and M2 dominant wavelength ranges. As understood from the actual production process, there is a uniformity shift in the performance of the produced light emitting element when the production lot is different. All light emitting elements are also understood as being light emitting elements of different production batches, which do not have exactly the same properties, but which are to be manufactured to form the same batch of light emitting devices. In the embodiment of the present invention, the performance of the light emitting element mainly refers to the color coordinates and the main length, and in other embodiments, the performance of the light emitting element may also include the driving voltage, the light emitting brightness, and the performance of other light emitting elements known to those skilled in the art, which is not limited in the embodiment of the present invention.

The chromaticity mixing bin method and the band mixing bin method of the plurality of light emitting elements on the substrate are exemplarily described below with reference to fig. 3 to 6.

Illustratively, on the basis of the color block structure 20 shown in fig. 3, there may be two chroma blend bin modes, which are respectively shown as a first chroma blend bin mode 210 and a second chroma blend bin mode 220.

For example, the first color mixing bin 210 represents a design of 6-mixing 2, that is, by mixing colors (i.e., matching) of the color blocks a+ C, A + F, C +d and d+f, the color coordinate range finally embodied by the light emitting device is concentrated and converged into two color blocks located in the middle, that is, the color blocks B and E. In this way, in the 6-mix 2 design, the patch area range can converge to 2/6 of that in the non-mixed color.

The second chroma-mix mode 220 represents a 6-mix 1 design, i.e., the color coordinate range finally embodied by the light-emitting device is concentrated and converged to the middle area by mixing the color blocks a+ F, B +e and c+d, which is indicated by the dashed boxes in the color blocks B and E in fig. 3. In this way, in the 6-mix 1 design, the patch area range can converge to 1/6 of that in the case of uncolored color.

It should be noted that, fig. 3 only illustrates the design scheme of 6-1 and the design scheme of 6-2 by way of example, but the method for manufacturing the light emitting device according to the embodiment of the present invention is not limited to the division and matching of color blocks. In other embodiments, the number of color patches and the color mixing mode may be set on the premise that convergence of the color patch area range to the intermediate value can be achieved according to the actual requirement of the manufacturing method of the light emitting device, which is not limited in the embodiment of the present invention.

In the actual production process, the output of the light-emitting element has band distribution, which leads to metamerism. As shown in fig. 5, a spectrum diagram 30 is exemplarily illustrated as a blue light chip. The dominant wavelength range of the blue light chip may be 452nm-460nm, and the band bin region is divided by 2nm, so that 4 band bin regions exist, the spectrums of which are respectively shown as L301, L302, L303 and L304 in fig. 5, and the dominant wavelength ranges are 452nm-454nm, 454nm-456nm, 456nm-458nm and 458nm-460nm. Taking a blue light chip as a blue light emitting diode (light emitting diode, LED) as an example, the output ratio of L302 to L303 is higher and can be more than 80%; the yield ratio of L301 to L304 is small, which may be less than 20%. According to the embodiment of the invention, the blue light LEDs in the main wavelength range represented by the boundary band bin region, namely L301 and L304, can be utilized through band mixing, so that the white point coordinate fluctuation range is reduced, the utilization rate of the blue light LEDs is improved, and the manufacturing cost of the light-emitting substrate is reduced.

On this basis, fig. 6 shows two band mix bin modes, shown as a first band mix bin mode 310 and a second band mix bin mode 320, respectively.

For example, the first band-mixing method 310 may be understood as mixing the band-bin regions in pairs according to the L301+l303 or l302+l304, that is, the band-bin regions in the less-producing region are mixed with the band-bin regions in the multi-producing region, and the band-bin regions in the center (wavelength near the middle value) may not need the band-mixing bin. The main wavelength range finally embodied by the light emitting device can be concentrated to a range of 4nm of the intermediate region. Thus, in this scheme, the dominant wavelength fluctuation range can be converged to 1/2 of that when the band mixing bin is not performed, i.e., the dominant wavelength fluctuation range is reduced.

For example, the second band bin mode 320 may be understood as a-F chroma mixing of the two-by-two mixed bins, i.e., the high-low band bin region and the center band bin region, according to the L301+ L304 or the L302+ L303. The main wavelength range finally embodied by the light emitting device can be concentrated to a range of 2nm of the intermediate region. Thus, in this scheme, the dominant wavelength fluctuation range can converge to 1/4 of that when no band mixing is performed, i.e., the dominant wavelength fluctuation range is reduced.

In fig. 5 and 6, only the main wavelength range of 4 is exemplified, and the span of the band bin region is 2nm, which illustrates the design scheme of the band bin. In other embodiments, the band bin region may also span other values, such as 3nm, 4nm, etc.; the number of dominant wavelength ranges may be determined according to the span of the band bin region and the overall dominant wavelength range of the light emitting element, which is not limited by the embodiment of the present invention.

In addition, the band mixing bin may also adopt other modes, as long as the main wavelength fluctuation range can be converged to the intermediate value, and the convergence degree can be set according to the actual requirements of the light emitting device and the manufacturing method thereof, which is not limited by the embodiment of the invention.

According to the manufacturing method of the light-emitting element, provided by the embodiment of the invention, the main wavelength range of the light-emitting elements of the same light-emitting element group is matched while the color blocks of the light-emitting elements are matched, so that the main wavelength fluctuation range can be reduced, and the large fluctuation of white point coordinates caused by the large main wavelength fluctuation can be avoided; on the basis, the white point correction is not needed to be carried out through the gamma curve. Therefore, the fluctuation range of white point coordinates can be reduced, and meanwhile, the display brightness and the display contrast ratio are not lost, so that the display picture can be ensured to have higher brightness and contrast ratio, and the user can be ensured to have better user experience.

Next, a method of manufacturing the light emitting device will be described in detail with reference to fig. 7 and 8.

Optionally, fig. 7 is a flow chart of a manufacturing method of another light emitting device according to an embodiment of the present invention. Referring to fig. 7, the manufacturing method includes:

s410, providing a substrate base plate.

S420, providing a plurality of light-emitting elements.

S430, dividing the light-emitting elements of the same color into light-emitting elements of a plurality of different color blocks according to the positions of the color coordinates of the light-emitting elements in the chromaticity diagram.

The color coordinates of the light emitting elements of the same color can be concentrated in a certain area in the color coordinate graph, and a plurality of different color blocks can be obtained by dividing the area. For example, reference may be made to block structure 20 in fig. 3.

This step provides for the subsequent division of the light emitting elements into groups of light emitting elements.

It is understood that this step may be performed by manually dividing the color blocks according to the manufacturing method of the light emitting device, or by performing the color block division using any dividing standard known to those skilled in the art, which is not limited in the embodiment of the present invention.

S440, dividing the light emitting elements belonging to the same color light into a plurality of light emitting elements with different dominant wavelength ranges according to the dominant wavelength values corresponding to each color block.

The dominant wavelengths of the light emitting elements of the same color light can be concentrated in a certain range in the spectrogram, and multiple different dominant wavelength ranges can be obtained by dividing the range. For example, reference may be made to the spectrogram 30 in fig. 5.

It is understood that this step may be performed by manually dividing the dominant wavelength range according to the manufacturing method of the light emitting device, or by using any dividing standard known to those skilled in the art, which is not limited in the embodiment of the present invention.

Referring to fig. 3 to 6 in combination with S430 and S440, since the total main wavelength ranges corresponding to the color coordinates in each color block range are substantially the same, the total main wavelength ranges corresponding to the color blocks of all the light emitting elements can be taken as a whole, and the main wavelength ranges are divided according to S440, and thereafter, the light emitting elements are grouped by comprehensively considering both aspects in the color blocks and the main wavelength ranges.

That is, the band mixing is performed while the chromaticity mixing is performed, so that the dominant wavelength fluctuation can be reduced; it is advantageous to narrow the fluctuation range of the white point coordinates while ensuring higher display brightness and contrast.

S450, forming a plurality of light-emitting elements on one side of the substrate.

Thus, a light-emitting substrate was formed.

Optionally, fig. 8 is a flow chart of a manufacturing method of a light emitting device according to an embodiment of the present invention. Referring to fig. 8, the manufacturing method includes:

s510, providing a substrate base plate.

S520, providing a plurality of light-emitting elements.

S530, measuring the color coordinates of the light-emitting element.

Wherein the color coordinates are the positions of the light emitted by the light emitting element in the chromaticity diagram.

By way of example, the color coordinates of the light-emitting element may be measured directly using any optical device known to those skilled in the art; alternatively, the color coordinates of the light emitting element are indirectly obtained by measuring the brightness or other parameters of the light emitting element and calculating, which is not limited in the embodiment of the present invention.

S540, determining the position of the color coordinates of the light-emitting elements in the chromaticity diagram, and marking the light-emitting elements positioned in different color blocks by using different color block identifiers.

The color coordinates correspond to the positions of the color coordinates in the chromaticity diagram one by one, and the color blocks to which the light-emitting elements belong can be determined by the positions of the color coordinates in the chromaticity diagram. In the step, the luminous elements positioned in different color blocks are marked by different color block identifiers, so that the luminous elements with the same color block identifier can be conveniently used as one type in the follow-up process, and the chromaticity of the luminous elements of different types can be mixed according to the color block identifiers.

Illustratively, referring to FIG. 2, the color patch identifications may be 201, 202, 203, 204, 205, and 206; or the color patch identification may be A, B, C, D, E and F; the color block identifier may be a combination of numbers and letters, or the color block identifier may be other identifiers known to those skilled in the art and used for distinguishing different color blocks, which are not limited in this embodiment of the present invention.

S550, determining the dominant wavelengths of the light-emitting elements according to the positions of the color coordinates of the light-emitting elements in the chromaticity diagram, and marking the light-emitting elements in different dominant wavelength ranges by using different dominant wavelength identification marks.

The main wavelength corresponding to each color coordinate on the straight line passing through the standard hundred point light sources, namely the O point, is the same, and the main wavelength range of the light emitting element can be determined by the position of the color coordinate in the chromaticity diagram. In this step, the light emitting elements in different dominant wavelength ranges are marked by different dominant wavelength identifiers, so that the subsequent use of the light emitting elements with the same dominant wavelength identifier as one type is facilitated, and different light emitting element wave bands are mixed according to the dominant wavelength identifier.

For example, referring to fig. 5 or 6, the dominant wavelength identifications may be L301, L302, L303, and L304; or the dominant wavelength identification may be da, db, dc, dd; alternatively, the dominant wavelength identifier may be other identifiers that may be used to distinguish between different dominant wavelength ranges, as known to those skilled in the art, which is not limited by the embodiment of the present invention.

Thus, according to the color block and the dominant wavelength range of the light emitting elements, each light emitting element can be marked by the color block mark and the dominant wavelength mark, and a "//" interval can be used between the signs of the color block mark and the dominant wavelength mark to form the comprehensive mark. Illustratively, the integrated identifier may be 201// L301, A// da, 201// da, or a// L301, and may be in other forms according to the difference between the color block identifier and the dominant wavelength identifier, which is not limited by the embodiment of the present invention.

Thereafter, performing S560 may include performing S561 and S562.

S561, light emitting elements having different color lump identifications and different dominant wavelength identifications are set as one light emitting element group.

Optionally, with continued reference to fig. 3, 5 and 6, the color-block identifiers include A, B, C, D, E and F arranged right-to-left and top-to-bottom in the chromaticity diagram, and the dominant-wavelength identifiers include da, db, dc and dd arranged small-to-large in dominant-wavelength values, shown as L301, L302, L303 and L304, respectively, in fig. 5 and 6; the light emitting element has any combination of color block and dominant wavelength signatures, comprising: a-da, A-db, A-dc, A-dd, B-da, B-db, B-dc, B-dd, C-da, C-db, C-dc, C-dd, D-da, D-db, D-dc, D-dd, E-da, E-db, E-dc, E-dd, F-da, F-db, F-dc or F-dd.

On this basis, S561 may include:

grouping color block marks according to the groups A-F, B-E, C-D, A-C, D-F or C-D; the dominant wavelength identification is grouped in pairs da-dc, db-dd, da-dd, or db-dc.

By way of example, fig. 6 illustrates a grouping manner of light emitting elements forming a light emitting element group by using a-F chromaticity mix in combination with different types of band mix, wherein light emitting elements indicated by two-end arrows of a double-headed arrow in fig. 6 can be used as two light emitting elements in the same light emitting element group. By way of example, the light-emitting element group may include A-da+F-dd, A-db+F-dc, A-dc+F-da, A-dd+F-da, A-dc+F-db, and A-db+F-dc.

Therefore, through the chromaticity mixed bin and the band mixed bin, the convergence of the color coordinate range and the dominant wavelength range to the intermediate value is realized, and the reduction of the fluctuation range of the white point coordinate is facilitated.

In other embodiments, S361 may further include, as a group, light emitting elements of the intermediate band bin region of the high-yield region without band mixing, and may include, for example, a-db+f-db, or a-dc+f-dc, which is not limited by the embodiment of the present invention.

Thus, the group matching of the light emitting elements is completed.

S562, forming a light-emitting element group on one side of the substrate.

This step may include disposing two light emitting elements in the same light emitting element group adjacent to each other.

Taking an example in which a light-emitting device includes a light-emitting element group of one scheme, this step can be understood as disposing two light-emitting elements in the light-emitting element group at intervals of 1:1 in order. In other embodiments, the light emitting device may further include a plurality of light emitting element groups, and the step may further include sequentially arranging the light emitting element groups at intervals in an equal ratio. Therefore, the light-emitting elements of various different chromaticity bin regions and wave band bin regions can be uniformly distributed on the substrate, so that the color mixing effect is good, and the white point coordinate fluctuation range of the light-emitting device is reduced.

Optionally, the light emitting element comprises an LED bead or micro-LED chip.

The LED lamp beads may also be referred to as LED chips, and are commonly used in backlight modules of liquid crystal display devices as light emitting elements on lamp bars. After passing through the chromaticity mixed bin and the wave band mixed bin, the LED lamp beads have smaller fluctuation range of dominant wavelength and fluctuation range of white point coordinates, thereby being beneficial to reducing the fluctuation range of white point coordinates of the backlight module and the liquid crystal display device.

The micro-LED chip has smaller size relative to the LED lamp beads and can be used in an LED display device. For example, a single independent micro-LED chip may be formed, and then the micro-LED chip is electrically connected to one side surface of the substrate base plate by a mass transfer technique or a bulk transfer technique to form a micro-LED display panel or device. After the micro-LED chip passes through the chromaticity mixed bin and the band mixed bin, the dominant wavelength fluctuation range and the white point coordinate fluctuation range reflected by the micro-LED chip are smaller, so that the white point coordinate fluctuation range of the micro-LED display device is reduced.

In other embodiments, the light emitting element may be other types of light emitting structures known to those skilled in the art, which are not limited in this embodiment of the present invention.

Based on the same inventive concept, the embodiment of the invention also provides a light-emitting device, which can be manufactured based on the manufacturing method of the light-emitting device provided by the embodiment. Therefore, the light emitting device also has the advantages of the method for manufacturing the light emitting device provided by the above embodiment, and the same points can be understood with reference to the above description, and will not be described in detail.

The light emitting device provided by the embodiment of the invention can comprise a substrate and a plurality of light emitting elements formed on one side of the substrate; the light emitting elements are provided with a plurality of different color blocks and a plurality of different dominant wavelength ranges, and the different color blocks and the different dominant wavelength ranges correspond to light of the same color; using two adjacent light-emitting elements as a light-emitting element group; the average value of chromaticity of color blocks of two light-emitting elements of the same light-emitting element group is within a first threshold range, and the average value of dominant wavelengths of dominant wavelength ranges of two light-emitting elements of the same light-emitting element group is within a second threshold range. The main wavelength range of the light-emitting elements of the same light-emitting element group is matched while the color blocks of the light-emitting elements are matched, so that the main wavelength range can be converged to a smaller fluctuation range while the color coordinates are converged to the smaller fluctuation range; the fluctuation range of the dominant wavelength can be reduced, so that the problem of large fluctuation of white point coordinates caused by large fluctuation of the dominant wavelength can be avoided; meanwhile, white point correction is not needed through gamma curve. Therefore, the fluctuation range of white point coordinates can be reduced, and meanwhile, the display brightness and the display contrast ratio are not lost, so that the display picture can be ensured to have higher brightness and contrast ratio, and the user can be ensured to have better user experience.

Optionally, in the light emitting device, at least one light emitting element group is periodically arranged on one side of the substrate.

Wherein, two light-emitting elements in the same light-emitting element group are sequentially arranged at intervals according to 1:1; on this basis, when the same light emitting device includes at least two light emitting element groups, the light emitting element groups are also periodically arranged in equal proportion. Therefore, the light-emitting elements in different color blocks and the main wavelength range can be uniformly distributed on one side of the substrate, so that the light-emitting effect is uniform while the main wavelength fluctuation and white point coordinate fluctuation are reduced, the problems of uneven brightness or uneven chromaticity of stripes, dark lines or bright lines and the like caused by uneven distribution of the light-emitting elements can be avoided, and the light-emitting effect of the light-emitting device is improved.

Fig. 9 to 12 show the structure of four kinds of light emitting devices 90, for example. The light emitting element group 920 may include a first light emitting element group 9201 and a second light emitting element group 9202, where the first light emitting element group 9201 and the second light emitting element group 9202 include two different light emitting elements 910, respectively, and different filling types of the light emitting elements 910 may indicate that the comprehensive identifiers of the light emitting elements 910 are different. Wherein, fig. 9 and 10 can represent a light bar structure, which can be used as a backlight light bar in a liquid crystal display device; fig. 11 and 12 may represent a structure of a lamp panel, or a structure of an LED display device.

For example, fig. 9 and 11 show only one light emitting element group 920 (i.e., the first light emitting element group 9201) periodically arranged, and the light emitting elements 910 in each row may be arranged in the following manner:

A-da、F-dc、A-da、F-dc、A-da、F-dc、A-da、F-dc；

or may be:

A-da、F-dd、A-da、F-dd、A-da、F-dd、A-da、F-dd。

for example, fig. 10 and 12 exemplarily show that two light emitting element groups 920 (i.e., a first light emitting element group 9201 and a second light emitting element group 9202) are periodically arranged, and the arrangement manner of the light emitting elements 910 in each row may be as follows:

A-da、F-dc、A-db、F-dd、A-da、F-dc、A-db、F-dd；

or may be:

A-da、F-dd、A-db、F-dc、A-da、F-dd、A-db、F-dc。

this is an exemplary illustration and is not to be construed as limiting the light emitting device 90 provided in accordance with embodiments of the present invention. In other embodiments, the number and arrangement of the light emitting element groups 920 and the light emitting elements 910 in the light emitting device 90 may be set according to the actual requirements of the light emitting device 90, which is not limited in this embodiment of the present invention.

In addition, the combination of the types (i.e., the comprehensive identifier) of the light emitting elements 910 may be any combination that is available by combining the chromatic mixing bin with the band mixing bin according to the embodiment of the present invention, which is not limited thereto.

Alternatively, with continued reference to fig. 5, the dominant wavelengths of the light emitting elements of the various dominant wavelength ranges of the respective light emitting element groups are in an arithmetic progression.

By the arrangement, the main wave length whole range and other wave band ranges of the normal light-emitting element can be divided, so that the dividing mode is simple, and the grouping is simple.

For example, the total main wavelength range of the light emitting element may be 452nm to 460nm, and dividing the band bin region (i.e., the band range) by 2nm, so as to form 4 main wavelength ranges with the same difference value of main wavelengths, i.e., the main wavelength ranges are 452nm to 454nm, 454nm to 456nm, 456nm to 458nm, and 458nm to 460nm, respectively. Taking the minimum value of each main wavelength range as a reference, wherein the difference value is 2nm; or taking the maximum value of each dominant wavelength range as a reference, wherein the difference value is 2nm; or the average value of each dominant wavelength range is taken as a reference, and the difference value is 2nm.

In other embodiments, other dominant wavelength values, for example, 3nm, 4nm, or 5nm, may be used as the boundary to divide the band bin region, which may be set according to the actual requirements of the light emitting element and the light emitting device, which is not limited in the embodiment of the present invention.

Alternatively, with continued reference to any of fig. 9-12, the dominant wavelength differences of the dominant wavelength ranges of the two light emitting elements 910 of each light emitting element group 920 may be equal.

The boundary band bin region and the central band bin region can be selectively subjected to band mixing to realize convergence of the dominant wavelength range to an intermediate value.

The first band mix mode 310 of fig. 6 illustrates the band mix scheme, by way of example. The combination of the dominant wavelength ranges of the light emitting elements in the two light emitting element groups may be l301+l303 or l302+l304. The difference in dominant wavelengths was 4nm.

It should be noted that, in other embodiments, the difference of the dominant wavelengths in the dominant wavelength range may be other dominant wavelength values, which may be set according to the actual requirement of the light emitting device 90, which is not limited by the embodiment of the present invention.

Alternatively, with continued reference to fig. 10 or 12, the light emitting device 90 includes a plurality of light emitting element groups 920, the dominant wavelength differences of the dominant wavelength ranges of two light emitting elements 910 of different light emitting element groups 920 being different; the light emitting element group 910 includes a first light emitting element 9101 (or 9103) and a second light emitting element 9102 (or 9104); the dominant wavelength of the dominant wavelength range of the first light emitting element 9101 (or 9103) is less than the dominant wavelength of the dominant wavelength range of the second light emitting element 9102 (or 9104); any two light emitting element groups 920 include a first light emitting element group 9201 and a second light emitting element group 9202; wherein, the dominant wavelength of the dominant wavelength range of the first light emitting element 9101 of the first light emitting element group 9201 is smaller than the dominant wavelength of the dominant wavelength range of the first light emitting element 9103 of the second light emitting element group 9202, and the dominant wavelength of the dominant wavelength range of the second light emitting element 9102 of the first light emitting element group 9201 is greater than the dominant wavelength range of the second light emitting element 9104 of the second light emitting element group 9202.

The band mixing bin of the boundary band bin region and the band mixing bin of the central band bin region can be selectively carried out on the respective band mixing bin, and the band mixing bin of the boundary band bin region comprises the band mixing bin of the band bin region with the long main wavelength range and the band mixing bin of the short main wavelength range, so that the main wavelength range is effectively converged to the intermediate value.

The second band mix mode 320 of fig. 6 illustrates the band mix scheme, by way of example. The combination of dominant wavelength ranges of the light emitting elements in the two light emitting element groups may be l301+l304 or l302+l303, and the dominant wavelength ranges of the bin regions in each band are 452nm-454nm and 458nm-460nm or 454nm-456nm and 456nm-458nm, respectively, and accordingly, the dominant wavelength differences of the first light emitting element group 9201 and the second light emitting element group 9202 are 6nm and 2nm, respectively.

In other embodiments, the dominant wavelength difference between the dominant wavelength ranges of the first light emitting element group 9201 and the second light emitting element group 9202 may be other dominant wavelength values, which may be set according to the actual requirements of the light emitting device 90, and the embodiment of the present invention is not limited thereto.

Optionally, with continued reference to fig. 9 or 10, the light emitting element 910 is an LED light bulb; the substrate base 900 may be a lamp panel; the LED lamp beads are arranged on the lamp panel in a row.

Thus, a backlight bar in a liquid crystal display device can be formed.

By way of example, a row of LED beads is shown in FIGS. 9 and 10, which may be used as the light source for a side entry backlight light bar.

In other embodiments, the lighting strip may be formed, and in other application scenarios, the light emitting device may also exist in other forms, which is not limited by the embodiment of the present invention.

Alternatively, with continued reference to fig. 11 or 12, the light emitting element 910 is a micro-LED chip; the micro-LED chips are arrayed on one side surface of the substrate 900.

Thus, an LED display device can be formed.

For example, fig. 11 and 12 show an array of 8 columns and 5 rows of light emitting elements 910, which may also be used as a light source for a direct type backlight module to realize local backlight (local dimming), which is advantageous for improving the luminance dynamic range of the liquid crystal display device formed by the light emitting device 90.

In other embodiments, the number and array arrangement of the light emitting elements 910 in the light emitting device 90 may be further set according to the actual requirement of the light emitting device 90, which is not limited in the embodiment of the present invention.

On the basis of the above embodiment, the embodiment of the invention further provides a backlight module, which includes any one of the light emitting devices provided in the above embodiment. Therefore, the backlight module provided by the embodiment of the invention also has the beneficial effects of the light emitting device and the manufacturing method thereof, and the same points can be understood by referring to the above, and the description thereof will not be repeated.

Fig. 13 is a schematic structural diagram of a backlight module according to an embodiment of the present invention. Referring to fig. 13, the backlight module 80 includes a light emitting device 90 and an optical film layer to realize a uniformly highlighted backlight.

The optical film layer may include the first reflective layer 810, the light guide plate 820, the cross prism 830, the protective film 840, and the second reflective structure 850, and may further include other optical structures or protective structures known to those skilled in the art, and the relative positional relationship and functions of the structures may be any of those known to those skilled in the art, which is not repeated herein or limited by the embodiments of the present invention.

Note that, fig. 13 shows only an exemplary side-entry backlight module 80. In other embodiments, the backlight module 80 may be a direct type backlight module, which is not limited in the embodiment of the invention.

On the basis of the above embodiment, the embodiment of the invention also provides a display device, which comprises the backlight module provided by the above embodiment. Therefore, the display device provided by the embodiment of the invention also has the above light emitting device and the manufacturing method thereof, and the backlight module has the beneficial effects, and the same points can be understood by referring to the above description and will not be repeated.

Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention, and shows a cross-sectional structure of the liquid crystal display device. Referring to fig. 14, the display device 70 includes a backlight module 80 and a liquid crystal display panel 700, wherein the liquid crystal display panel 700 is disposed on a light emitting side of the backlight module 80.

The lcd panel 700 may include a bottom polarizer 730, an array substrate 710, a liquid crystal layer 750, a color film substrate 720, and a top polarizer 740 sequentially disposed in a direction away from the backlight module 80; other optical structures or protective structures known to those skilled in the art may be included, and the relative positional relationship and functions of the structures may be any one known to those skilled in the art, and the embodiments of the present invention are not described in detail and are not limited thereto.

The white point coordinate of the liquid crystal display device is obtained by integrating the product of the frequency spectrum of the backlight module and the frequency spectrum of the liquid crystal display panel at each frequency point, so that when the fluctuation range of the white point coordinate of the backlight module and the fluctuation range of the dominant wavelength are smaller, the influence of metamerism on the fluctuation of the white point coordinate of the liquid crystal display device can be reduced, and the fluctuation range of the white point coordinate of the liquid crystal display device is reduced. At the same time, the dominant wavelength fluctuation range of the liquid crystal display device can be reduced.

On the basis of the above embodiment, the embodiment of the present invention further provides a display device, where the display device includes the light emitting device provided in the above embodiment. Therefore, the display device provided by the embodiment of the invention also has the advantages of the light emitting device and the manufacturing method thereof, and the same can be understood by referring to the above, and the description thereof will not be repeated.

Fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention, and shows a cross-sectional structure of an LED display device. Referring to fig. 15, the display device 70 includes a light emitting device 90 and may further include an encapsulation protection 770.

The package protection structure 770 is used for protecting the light emitting element 910, which is beneficial to ensuring performance stability of the light emitting element 910, thereby being beneficial to prolonging the service life of the light emitting device 70.

It should be noted that the package protection structure 770 may be a thin film package structure, or may be other package protection structures known to those skilled in the art, which is not limited in this embodiment of the present invention.

The white point coordinate fluctuation range of the liquid crystal display device according to the embodiment of the present invention is described below by taking one or more of the above-written chromaticity mix and band mix as an example, and by referring to the color coordinate range diagrams 60 shown in fig. 16 to 19.

By way of example, taking the color block division and chromaticity mixing bin modes shown in fig. 3, 5 and 6, and the dominant wavelength range division mode and the band mixing bin mode as examples, specifically taking A, B, C, D, E and F as examples for six color blocks respectively, fig. 16 shows white point fluctuation and dominant wavelength fluctuation comparison in the ideal mixing bin, metameric mixing bin, first band mixing bin mode 310 and second band mixing bin mode 320, and specific results are shown in table 1.

Table 1 comparison table of different scheme band mix results

Wherein, the metameric mix bin represents the chromatic mix bin only, and the band mix bin is not combined; the dominant wavelength fluctuation represents the dominant wavelength fluctuation of the backlight module, the module white point difference represents the difference of white point coordinates of the liquid crystal display device, the dominant wavelength is the calculated dominant wavelength of various color lights of the liquid crystal display device, and Rλ, Gλ and Bλ represent the dominant wavelengths of red light, green light and blue light respectively. The white point coordinate fluctuation of the liquid crystal display device can be characterized by the module white point difference, and the smaller the values of Wx and Wy are, the smaller the punctuation fluctuation is.

As can be seen from table 1, the white point fluctuation of the liquid crystal display panel can be effectively reduced by combining the band mixing bin with the chromaticity mixing bin, and the white point fluctuation range of the second band mixing bin mode 320 is the same as that of the ideal mixing bin mode; moreover, compared with metameric mix bin, the white point fluctuation is reduced (0.003,0.007), and the variation range is more than 30%. On the other hand, the dominant wavelength fluctuations of red, green, and blue light are reduced; and the dominant wavelength fluctuation of the red light, the green light and the blue light of the second band mixing bin mode 320 can be respectively controlled within the range of +/-1.0 nm, +/-0.2 nm and +/-0.7 nm, and compared with metameric mixing bin, the dominant wavelength fluctuation range is reduced by more than 50%.

Illustratively, fig. 17 shows a white point distribution of a backlight unit. Wherein each color block identifier is SK1, SK2, SK3, SK4, SK5, SK6, SK7, SK8, SK9, SK10, SK11 and SK12 respectively. For color blocks, a 10-mix 4 chroma mixing bin scheme is adopted, namely SK1, SK2, SK3, SK4, SK5, SK7, SK8, SK9, SK10 and SK11 are used for chroma mixing bin, so that color coordinates are converged to an area with the size of the middle four color blocks. Where L632 represents the distribution area of the color coordinates after rational chromaticity mixing bin, and L631 represents the distribution area of the color coordinates obtained by fitting the actual backlight white point coordinates (shown by circles in the figure). Thus, convergence of the color coordinates to the intermediate value can be achieved by the chroma blend bin and the band blend bin.

By way of example, fig. 18 shows the simulation calculation result on the basis of fig. 17. Specific parameters that can be reflected are shown in table 2.

Table 2 comparison of simulation results for different scheme band mix bins

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Wherein 1, 2, 3 and 4 represent the positions of the corner points of the white point fluctuation range, respectively. Illustratively, taking the azimuth shown in fig. 18 as an example, 1, 2, 3 and 4 represent the angular point positions of the lower left corner, the upper right corner and the lower right corner, respectively, the white point difference is the module white point difference in table 1, and other points similar to those in table 1 are understood with reference to the description of table 1 and are not repeated herein.

As can be seen from Table 2, the metameric mix has an enlarged white point fluctuation range (0.005,0.009) relative to the ideal mix, and the main wavelength fluctuations of the corresponding red and green light have been enlarged by 1.1nm and 1.0nm, respectively. By using the first band-mix mode 310, i.e., the boundary band bin region and the mid band bin region, white point fluctuations can be reduced (0.003,0.006) relative to metameric mix bin, with the dominant wavelength fluctuations of red and green light reduced by 0.7nm and 0.6nm, respectively.

Second, as can be seen from the comparison results of tables 1 and 2, the Wx fluctuation in table 1 is small and the Wy fluctuation is large; however, in table 2, the fluctuation of Wx is larger, the fluctuation of Wy is smaller, that is, the trend of fluctuation of Wx and Wy is opposite, which is related to the division manner of color patches, and does not limit the display device provided by the embodiment of the present invention.

For example, fig. 19 shows the measured white point coordinates (represented by filled diamonds) of the liquid crystal display device when the first band-mix mode 310 in table 2 is applied to an actual liquid crystal display panel product, and the measured white point fluctuation profile L641 is drawn according to the measurement result. For example, the testing method may be that, when the color block 10 shown in fig. 17 is mixed 4, all schemes of confirming that the chroma mixing bin combines with the limit of the post-band chroma fluctuation of the band mixing bin and selecting the color block corner to perform the mixing bin are tested. The comparison of the simulation results with the actual data can be seen in table 3.

Table 3 comparison of simulation results with measured data

Wherein Δwx and Δwy represent white point differences.

As shown in table 3, the actually measured white point fluctuation range of the backlight module, the actually measured white point fluctuation range of the display device, and the main wavelength fluctuation range of the display device are all consistent with the simulation result within the error range. Therefore, the product design can be guided through the simulation experiment design.

It should be noted that, the foregoing description of the embodiments of the present invention is merely illustrative with reference to fig. 16 to 18, and does not limit the display device provided by the embodiments of the present invention.

According to the manufacturing method of the light-emitting device, the backlight module, the liquid crystal display device and the LED display device, provided by the embodiment of the invention, the main wavelength fluctuation range and the white point coordinate fluctuation range can be reduced by combining the chromaticity mixing bin with the band mixing bin; meanwhile, white point correction is not needed through gamma curve. Therefore, the fluctuation range of white point coordinates can be reduced, and meanwhile, the display brightness and the display contrast ratio are not lost, so that the display picture can be ensured to have higher brightness and contrast ratio, and the user can be ensured to have better user experience. When the display device is applied to vehicle-mounted display, the display device is favorable for meeting the requirements of customers on white point fluctuation and dominant wavelength fluctuation of the vehicle-mounted display device.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A method of manufacturing a light emitting device, comprising:

providing a substrate;

forming a plurality of light emitting elements on one side of the substrate;

the light emitting elements are provided with a plurality of different color blocks and a plurality of different dominant wavelength ranges, and the plurality of different color blocks and the plurality of different dominant wavelength ranges correspond to light of the same color; taking two adjacent light-emitting elements as a light-emitting element group; the average value of chromaticity of color blocks of two light-emitting elements of the same light-emitting element group is in a first threshold range, and the average value of dominant wavelengths of dominant wavelength ranges of two light-emitting elements of the same light-emitting element group is in a second threshold range;

The second threshold range is related to a division mode of the main wavelength range and a band mixing mode;

the method comprises the steps that when chromaticity of two light-emitting elements of the same light-emitting element group are mixed, band mixing is carried out, so that the color coordinate range and the dominant wavelength range reflected by the same light-emitting element group are converged towards the middle value relative to the color coordinate range and the dominant wavelength range reflected by the two light-emitting elements in the light-emitting element group;

different dominant wavelength ranges are different band bin regions; the band bin region with the yield ratio of more than 80% is a band bin region of the more productive region, and the band bin region with the yield ratio of less than 20% is a band bin region of the less productive region; the band mixing bin includes band mixing the band bin regions of the less-producing region with the band bin regions of the more-producing region.

2. The method of manufacturing a light-emitting device according to claim 1, further comprising, before forming the plurality of light-emitting elements on the substrate side:

providing a plurality of the light emitting elements;

dividing the light-emitting elements of the same color into light-emitting elements of the plurality of different color patches according to the positions of the color coordinates of the light-emitting elements in a chromaticity diagram;

according to the value of the dominant wavelength corresponding to each color block, the light emitting elements belonging to the same color light are divided into a plurality of light emitting elements with different dominant wavelength ranges.

3. The method of manufacturing a light-emitting device according to claim 2, further comprising, after providing the plurality of light-emitting elements:

measuring color coordinates of the light emitting element;

dividing the light emitting elements of the same color light into the plurality of different color patches according to the positions of the color coordinates of the light emitting elements in a chromaticity diagram includes:

determining the position of the color coordinates of the light-emitting elements in a chromaticity diagram, and marking the light-emitting elements positioned in different color blocks by using different color block identifiers;

according to the value of the dominant wavelength corresponding to each color block, dividing the light emitting elements belonging to the same color light color block into light emitting elements in multiple different dominant wavelength ranges includes:

determining the dominant wavelength of the light-emitting element according to the position of the color coordinates of the light-emitting element in a chromaticity diagram, and marking the light-emitting element positioned in different dominant wavelength ranges by using different dominant wavelength identifiers;

forming a plurality of light emitting elements on the substrate side includes:

taking the light-emitting elements with different color block identifiers and different dominant wavelength identifiers as one light-emitting element group;

and forming the light-emitting element group on one side of the substrate.

4. The method of manufacturing a light-emitting device according to claim 3, wherein the color-block marks include A, B, C, D, E and F arranged from right to left and from top to bottom in a chromaticity diagram, and the dominant wavelength marks include da, db, dc and dd arranged from small to large in dominant wavelength values;

the light emitting element has any combination of the color block and dominant wavelength identifications, including: a-da, A-db, A-dc, A-dd, B-da, B-db, B-dc, B-dd, C-da, C-db, C-dc, C-dd, D-da, D-db, D-dc, D-dd, E-da, E-db, E-dc, E-dd, F-da, F-db, F-dc or F-dd;

the method for using the light-emitting elements with different color block identifiers and different dominant wavelength identifiers as one light-emitting element group comprises the following steps:

grouping the color lump marks in pairs according to A-F, B-E, C-D, A-C, D-F or C-D;

the dominant wavelength identification is grouped into two groups according to da-dc, db-dd, da-dd or db-dc.

5. The method of manufacturing a light-emitting device according to claim 1, wherein the light-emitting element includes an LED bead or a micro-LED chip.

6. A light emitting device, comprising:

a substrate base;

a plurality of light emitting elements formed on one side of the substrate;

7. The light-emitting device according to claim 6, wherein at least one of the light-emitting element groups is arranged periodically on the substrate side.

8. The light-emitting device according to claim 6, wherein the dominant wavelengths of the light-emitting elements in the plurality of different dominant wavelength ranges of each light-emitting element group are in an arithmetic progression.

9. The light-emitting device according to claim 6, wherein a difference in dominant wavelengths between dominant wavelength ranges of two light-emitting elements of each light-emitting element group is equal.

10. A light-emitting device according to claim 6, wherein the light-emitting device comprises a plurality of light-emitting element groups, and wherein a difference in dominant wavelength between dominant wavelength ranges of two light-emitting elements of different light-emitting element groups is different;

the light-emitting element group comprises a first light-emitting element and a second light-emitting element; the dominant wavelength of the dominant wavelength range of the first light emitting element is less than the dominant wavelength of the dominant wavelength range of the second light emitting element;

any two light-emitting element groups include a first light-emitting element group and a second light-emitting element group; wherein a dominant wavelength of the first light emitting element group is smaller than a dominant wavelength of the first light emitting element of the second light emitting element group, and a dominant wavelength of the second light emitting element of the first light emitting element group is larger than a dominant wavelength of the second light emitting element group.

11. The light-emitting device according to claim 6, wherein the light-emitting element is an LED bead;

the LED lamp beads are arranged on one side surface of the substrate in a row.

12. The light-emitting device according to claim 6, wherein the light-emitting element is a micro-LED chip;

the micro-LED chips are arranged on one side surface of the substrate in an array mode.

13. A backlight module comprising the light-emitting device according to any one of claims 6-12.

14. A display device comprising the backlight module of claim 13;

the display also comprises a liquid crystal display panel;

15. A display device comprising the light-emitting device according to any one of claims 6 to 12.