Method of manufacturing a display device

Abstract

A method for manufacturing a display device includes providing a plurality of first light emitting units and a plurality of second light emitting units, the first light emitting units and the second light emitting units configured to emit light of different colors; obtaining optical characteristic values of the first light emitting units and the second light emitting units; presetting a target color point of the display device; and transferring a part of the first light emitting units and a part of the second light emitting units to a target substrate according to the obtained optical characteristic values, so that a color point of the display device is aligned with the target color point.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a display device, and more particularly to a method for aligning the color dots of the display device with preset target color dots. Background Technology

[0002] In recent years, display devices have become increasingly important in a wide variety of electronic applications, such as automotive displays, wearable devices (like smartwatches), smartphones, tablets, laptops, and e-book readers. A display device can contain multiple light-emitting elements, and the light emitted by these elements can be mixed to create a single point of color.

[0003] However, in the manufacturing process of multiple light-emitting elements, factors such as process conditions, film thickness, or defects may affect the uniformity of epitaxy, resulting in differences in the optical characteristics (e.g., wavelength and / or brightness) of the emitted rays between different light-emitting elements. If these light-emitting elements with different optical characteristics are used in the manufacturing of display devices, it will cause color inhomogeneity in the displayed image. Conversely, if only light-emitting elements with the same optical characteristics are used, the utilization rate of the light-emitting elements will be reduced, or significant differences in the displayed images between different display devices may occur because the light mixing results are not considered. Summary of the Invention

[0004] One of the objectives of this invention is to provide a method for manufacturing a display device to solve the problems encountered in existing electronic device manufacturing methods, thereby enabling the color dots of the display device to align with the target color dots.

[0005] An embodiment of the present invention provides a method for manufacturing a display device, the method comprising: providing a plurality of first light-emitting units and a plurality of second light-emitting units, the first light-emitting units and the second light-emitting units being configured to emit light of different colors; obtaining optical characteristic values ​​of each first light-emitting unit and each second light-emitting unit; presetting a target color point of the display device; and transferring a portion of the first light-emitting units and a portion of the second light-emitting units to a target substrate according to the obtained optical characteristic values, so as to align the color point of the display device with the target color point. Attached Figure Description

[0006] Figure 1 This is a schematic flowchart of a method for manufacturing a display device according to an embodiment of the present invention.

[0007] Figure 2 This is a top view of the first light-emitting unit and the second light-emitting unit on the growth substrate according to an embodiment of the present invention.

[0008] Figure 3 This is a cross-sectional schematic diagram of the first light-emitting unit according to an embodiment of the present invention.

[0009] Figure 4This is a top view schematic diagram of a display device according to some embodiments of the present invention.

[0010] Figure 5 This is a color coordinate diagram according to an embodiment of the present invention.

[0011] Figures 6 to 8 This is a partial process diagram of the method for manufacturing a display device according to the present invention.

[0012] Figure 9 This is a partial process diagram of the method for manufacturing a display device according to the present invention.

[0013] Figure 10 This is a top view of the third light-emitting unit on the growth substrate according to an embodiment of the present invention.

[0014] Figure 11 This is a top view schematic diagram of a display device according to an embodiment of the present invention.

[0015] Figures 12 to 13 This is a schematic diagram of another part of the manufacturing process of the method for manufacturing the display device according to the present invention.

[0016] Explanation of reference numerals in the attached drawings: 100, 100(B1), 100(B1a) - First light-emitting unit; 110, 210, 510 - Growth substrate; 120, 220, 520 - First semiconductor layer; 130, 230, 530 - Light-emitting layer; 140, 240, 540 - Second semiconductor layer; 150, 250, 550 - First electrode; 160, 260, 560 - Second electrode; 200 - Second light-emitting unit; 300, 310, 320, 330 - First carrier plate; 400 - Second carrier plate; 500 - Third light-emitting unit; 600 - Third carrier plate; B1 - First... Group 1; B2 - Group 2; B3 - Group 3; BO - Bonding element; DE, DE1, DE2, DE3, DE4 - Display device; G1 - Group 4; G2 - Group 5; G3 - Group 6; Pb1, Pb2, Pb3, Pg1, Pg2, Pg3, Pr1, Pr2, Pr3 - Color dots; Pt, Pt1 - Target color dots; R1 - Group 7; R2 - Group 8; R3 - Group 9; S100, S200, S300, S400 - Steps; SB, SB1, SB2, SB3, SB4 - Target substrate; ST - Transfer element. Detailed Implementation

[0017] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, for ease of understanding and to keep the drawings concise, many of the drawings in this invention only depict a portion of the device, and specific elements in the drawings are not drawn to scale. Furthermore, the number and dimensions of each element in the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0018] Throughout this specification and claims, certain terms are used to refer to specific elements. Those skilled in the art will understand that electronic device manufacturers may use different names to refer to the same element. This document is not intended to distinguish between elements that have the same function but different names. In the following specification and claims, words such as "comprising" and "including" are open-ended terms and should therefore be interpreted as "containing but not limited to...". When the terms "comprising," "including," and / or "having" are used in this specification, they specify the presence of the stated feature, area, step, operation, and / or element, but do not exclude the presence or addition of one or more other features, areas, steps, operations, elements, and / or combinations thereof.

[0019] When an element or membrane is referred to as being "on" or "connected" to another element or membrane, it can be directly on or directly connected to the other element or membrane, or there can be an inserted element or membrane between the two. Conversely, when an element is referred to as being "directly" on or "directly connected" to another element or membrane, there can be no inserted element or membrane between the two.

[0020] The terms “approximately,” “equal to,” “same,” “substantially,” or “roughly” are generally interpreted as being within 20% of a given value or range, or as being within 10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range.

[0021] The display device described in this invention can be applied in electronic devices, wherein the display device can be a non-self-emissive display device or a self-emissive display device. Furthermore, the electronic device may also include a backlight device, an antenna device, a sensing device, or a splicing device, but is not limited thereto. The electronic device can be a bendable or flexible electronic device. The antenna device can be a liquid crystal type antenna device or a non-liquid crystal type antenna device, and the sensing device can be a sensing device for capacitance, light, heat, or ultrasound, but is not limited thereto. Electronic components can include passive and active components, such as capacitors, resistors, inductors, diodes, transistors, etc. Diodes can include light-emitting diodes or photodiodes. Light-emitting diodes can include, for example, organic light-emitting diodes (OLEDs), mini LEDs, micro LEDs, or quantum dot LEDs, but are not limited thereto. The splicing device can be, for example, a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device can be any combination of the foregoing, but is not limited thereto.

[0022] It should be understood that, without departing from the spirit of the present invention, features in several different embodiments can be replaced, recombined, or mixed to complete other embodiments.

[0023] Please refer to Figures 1 to 4 . Figure 1 This is a schematic flowchart of a method for manufacturing a display device according to an embodiment of the present invention. Figure 2 This is a top view of the first light-emitting unit and the second light-emitting unit on the growth substrate according to an embodiment of the present invention. Figure 3 This is a schematic cross-sectional view of the first light-emitting unit according to an embodiment of the present invention, for example, along... Figure 2 A schematic diagram of the cross section along the midline A-A'. Figure 4 This is a top view schematic diagram of a display device according to some embodiments of the present invention. For example... Figures 1 to 4 As shown, a method for manufacturing a display device DE according to an embodiment of the present invention may include the following steps. As in step S100 and... Figure 2 As shown, a plurality of first light-emitting units 100 and a plurality of second light-emitting units 200 are provided, wherein the first light-emitting units 100 and the second light-emitting units 200 are configured to emit light of different colors respectively.

[0024] According to some embodiments, "emitting different colors of light" may refer to a difference of 30 nanometers (nm) or more between the wavelengths corresponding to the maximum peaks of the spectra of the light emitted by the first light-emitting unit 100 and the second light-emitting unit 200 (hereinafter referred to as peak wavelengths), or it may refer to the fact that, to a person skilled in the art, the light emitted by the first light-emitting unit 100 and the second light-emitting unit 200 can be substantially clearly distinguished as different colors of light by the naked eye. For example, the first light-emitting unit 100 may be configured to emit blue light, and the second light-emitting unit 200 may be configured to emit green or red light, but is not limited thereto.

[0025] In some embodiments, such as Figure 2 and Figure 3 As shown, multiple first light-emitting units 100 can be arranged in an array on the growth substrate 110. For ease of explanation, only a 5x5 array of first light-emitting units 100 is shown, but the number of first light-emitting units 100 on the growth substrate 110 is not limited to this, or can be considered as... Figure 2 and Figure 3 The diagram shown is only a partial schematic of the growth substrate 110. The growth substrate 110 may be, for example, a wafer or an epitaxial substrate, but is not limited thereto. According to some embodiments, the first light-emitting unit 100 may be directly formed or fabricated on the surface of the growth substrate 110, but is not limited thereto. Figure 3As shown, each first light-emitting unit 100 may include a first semiconductor layer (e.g., but not limited to an N-type semiconductor layer) 120, a light-emitting layer 130, a second semiconductor layer (e.g., but not limited to a P-type semiconductor layer) 140, a first electrode 150, and a second electrode 160. The first semiconductor layer 120 is disposed on the surface of the growth substrate 110, the light-emitting layer 130 and the first electrode 150 are disposed on the first semiconductor layer 120, the second semiconductor layer 140 is disposed on the light-emitting layer 130, and the second electrode 160 is disposed on the second semiconductor layer 140. According to some embodiments, the first semiconductor layer 120 may be a P-type semiconductor, and the second semiconductor layer 140 may be an N-type semiconductor layer. Furthermore, a plurality of second light-emitting units 200 may be arranged in an array on the growth substrate 210. Similar to... Figure 3 The structure of the first light-emitting unit 100 shown may include a first semiconductor layer (e.g., but not limited to an N-type semiconductor layer) 220, a light-emitting layer 230, a second semiconductor layer (e.g., but not limited to a P-type semiconductor layer) 240, a first electrode 250, and a second electrode 260 (e.g., ...). Figure 8 (as illustrated), but the light-emitting layer 230 of the second light-emitting unit 200 and the light-emitting layer 130 of the first light-emitting unit 100 are configured to emit light of different colors.

[0026] In some embodiments, the first light-emitting unit 100 and / or the second light-emitting unit 200 may include, for example, an inorganic light-emitting diode (LED), a sub-millimeter inorganic light-emitting diode (mini LED), a micro inorganic light-emitting diode (micro LED), a quantum dot light-emitting diode (quantum dot LED), or an organic light-emitting diode (OLED), but are not limited thereto, and the first light-emitting unit 100 and / or the second light-emitting unit 200 may also have other structures or include other types of light-emitting elements.

[0027] Reference Figure 1After step S100, step S200 can be performed. As shown in step S200, the optical character values ​​of each first light-emitting unit 100 and each second light-emitting unit 200 are obtained. These optical character values ​​may be, for example, peak wavelength value, luminance value, a combination of peak wavelength and luminance, or color coordinate value, but are not limited thereto. In some embodiments, the optical character values ​​of each first light-emitting unit 100 and each second light-emitting unit 200 can be obtained by detecting them. In some embodiments, the above detection can be performed using an electroluminescence testing procedure. Specifically, current can be supplied to the first light-emitting unit 100 or the second light-emitting unit 200 to be detected to emit light. The light is then collected by a detector and analyzed to obtain the optical character values ​​of each first light-emitting unit 100 and each second light-emitting unit 200, but this is not a limitation. In some embodiments, the above-mentioned detection can be performed by a photoluminescence testing procedure. Specifically, light of a specific wavelength can be provided to the first light-emitting unit 100 and the second light-emitting unit 200 to excite them and emit light. The light is then collected by a detector and analyzed to obtain the optical characteristic values ​​of each of the first light-emitting unit 100 and each of the second light-emitting units 200, but this is not a limitation.

[0028] In some embodiments of the present invention, based on the obtained optical characteristic values ​​of each first light-emitting unit 100 and each second light-emitting unit 200, the first light-emitting unit 100 and the second light-emitting unit 200 can be further divided into multiple groups. For example... Figure 2As shown, in some embodiments, the plurality of first light-emitting units 100 can be divided into a first group B1 (represented by a right-upper-left lower-diagonal pattern with the lowest density), a second group B2 (represented by a right-upper-left lower-diagonal pattern with a medium density), and a third group B3 (represented by a right-upper-left lower-diagonal pattern with the highest density). The first light-emitting units 100 in the first group B1, second group B2, and third group B3 correspond to optical characteristic values ​​within different numerical ranges; that is, the first light-emitting units 100 in the same group correspond to optical characteristic values ​​within the same numerical range. Furthermore, the plurality of second light-emitting units 200 can be divided into a fourth group G1 (represented by a left-upper-right lower-diagonal pattern with the lowest density), a fifth group G2 (represented by a left-upper-right lower-diagonal pattern with a medium density), and a sixth group G3 (represented by a left-upper-right lower-diagonal pattern with the highest density). The second light-emitting units 200 in the fourth group G1, the fifth group G2, and the sixth group G3 correspond to optical characteristic values ​​in different numerical ranges, that is, the second light-emitting units 200 in the same group correspond to optical characteristic values ​​in the same numerical range. However, the number of groups is not limited to the above, and the first light-emitting unit 100 and the second light-emitting unit 200 can be divided into multiple groups according to actual needs.

[0029] On the other hand, refer to Figure 1 Step S300 can be performed. As shown in step S300, a target color point of the display device is preset. For example, the target color point may correspond to a color coordinate value (or a range of color coordinate values) in a color coordinate diagram or correspond to a color temperature (or a range of color temperatures), but is not limited thereto. In some embodiments, the target color point may be a color point corresponding to a mixture of blue and green light, or a color point corresponding to a mixture of blue, green, and red light (i.e., a white point), but is not limited thereto. In the method of manufacturing the display device DE of the present invention, step S300 can be performed at any time before step S400, for example, step S300 can be performed before step S100, or after step S100 and before step S400.

[0030] After obtaining the optical characteristic values ​​of each first light-emitting unit 100 and each second light-emitting unit 200 (as in step S200) and preset the target color point for the display device DE (as in step S300), step S400 can be performed. Figure 1 Step S400 and Figure 4As shown, based on the obtained optical characteristic values, a portion of the first light-emitting unit 100 and a portion of the second light-emitting unit 200 are transferred to the target substrate SB to align the color dots of the display device DE with the target color dots. The target substrate SB can be a substrate used in the display device DE, such as a substrate in a display panel for setting light-emitting elements and / or circuit layers, but is not limited thereto. In some embodiments, the target substrate SB may include a base layer and a circuit layer, with the circuit layer disposed on the base layer. The base layer may include rigid and / or flexible materials, such as glass, a quartz substrate, polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), other suitable materials, or combinations thereof, but is not limited thereto. The circuit layer may include, for example, circuits, wires, electronic components, and / or bonding pads, but is not limited thereto.

[0031] like Figure 4 As shown, after dividing the first light-emitting unit 100 and the second light-emitting unit 200 into multiple groups based on the obtained optical characteristic values ​​of each first light-emitting unit 100 and each second light-emitting unit 200, a portion of the first light-emitting unit 100 (e.g., the first light-emitting unit 100 of the first group B1) and a portion of the second light-emitting unit 200 (e.g., the second light-emitting unit 200 of the fourth group G1) can be transferred to the target substrate SB1 of the display device DE1, so that the color dots of the display device DE1 can be aligned with the preset target color dots in step S300. In addition, the first light-emitting unit 100 of the second group B2 and the second light-emitting unit 200 of the fifth group G2 can be transferred to the target substrate SB2 of another display device DE2, and the first light-emitting unit 100 of the third group B3 and the second light-emitting unit 200 of the sixth group G3 can be transferred to the target substrate SB3 of yet another display device DE3, so that the color dots of the display device DE1, the color dots of the display device DE2, and the color dots of the display device DE3 are all aligned with the preset target color dots.

[0032] The "color point alignment of the display device with the target color point" referred to in this invention means that the color point of the light emitted by the display device DE is the same as or approximately the target color point. For example, when the color coordinate value of the target color point is (X, Y), the color coordinate value of the color point of the manufactured display device DE can be within the range of (X±0.01, Y±0.01) or (X±0.02, Y±0.02). Therefore, by matching the first light-emitting unit 100 and the second light-emitting unit 200 emitting different colors of light and their optical characteristic values ​​(e.g., matching with a suitable group of light-emitting units), the color points of the manufactured display devices DE1, DE2, and DE3 can all be the same as or approximately the preset target color point, that is, the difference between the color points of the manufactured display devices DE is small. The color coordinates (Wx, Wy) of the color points of different colored light mixtures can be calculated, for example, by the relationship: (Wx, Wy)=a(Rx, Ry)+b(Bx, By)+c(Gx, Gy), where (Rx, Ry), (Bx, By) and (Gx, Gy) are the color coordinates of red, blue and green light of specific wavelengths, respectively, and a, b and c can be the brightness ratios of the red, blue and green light, respectively.

[0033] In some embodiments, such as Figure 4 As shown, after transferring a portion of the first light-emitting unit 100 and a portion of the second light-emitting unit 200 to the target substrate SB, if the first light-emitting unit 100 is configured to emit blue light and the second light-emitting unit 200 is configured to emit green light, a wavelength conversion element can be provided on a portion of the first light-emitting unit 100 to convert the blue light into red light. Therefore, even if no red light-emitting unit is provided on the target substrate SB, the target substrate SB, which is provided with the first light-emitting unit 100 emitting blue light and the second light-emitting unit 200 emitting green light, can still emit three or more colors of light by providing the first light-emitting unit 100 and the second light-emitting unit 200 emitting green light in conjunction with the wavelength conversion element. On the other hand, the selected first light-emitting unit 100 and second light-emitting unit 200 can be light-emitting units with better luminous efficiency, and then combined with the wavelength conversion element to finally generate multi-color light, without the need to provide red light-emitting units with relatively lower luminous efficiency. This can improve the overall luminous efficiency of the target substrate SB or equalize the luminous efficiency of all light-emitting units. The wavelength conversion elements mentioned above may include, for example, color filters, quantum dot materials, fluorescent materials or phosphorescent materials, but are not limited thereto.

[0034] In some embodiments, the optical characteristic values ​​of each first light-emitting unit 100 and each second light-emitting unit 200 obtained may be peak wavelengths, for example, measured by any suitable spectrometer. Based on the magnitude of the peak wavelengths of each first light-emitting unit 100 and each second light-emitting unit 200, the first light-emitting units 100 and the second light-emitting units 200 may be divided into multiple groups. For example, according to the Rec. 2020 color standard, the peak wavelength of blue light is 457 nanometers (nm), the multiple first light-emitting units 100 may be divided into a first group B1 with shorter peak wavelengths (e.g., peak wavelengths of 454-455.9 nm), a second group B2 with intermediate peak wavelengths (e.g., peak wavelengths of 456-457.9 nm), and a third group B3 with longer peak wavelengths (e.g., peak wavelengths of 458-460.9 nm). Furthermore, based on the Rec. 2020 color standard, where the peak wavelength of green light is 522nm, the multiple second light-emitting units 200 can be divided into a fourth group G1 with a shorter peak wavelength (e.g., peak wavelength of 520-520.9nm), a fifth group G2 with a medium peak wavelength (e.g., peak wavelength of 521-522.9nm), and a sixth group G3 with a longer peak wavelength (e.g., peak wavelength of 523-524.9nm). The numerical ranges of peak wavelengths corresponding to the above groups are merely examples and are not intended to limit the scope. For example, the present invention can also group them according to other color standards (e.g., the DCI-P3 color standard) or suitable numerical ranges.

[0035] Furthermore, please refer to Figure 5 This is a color coordinate diagram according to an embodiment of the present invention. For example... Figure 4 and Figure 5 As shown, in some embodiments, the first light-emitting unit 100 of the first group B1 can substantially correspond to color point Pb1, the first light-emitting unit 100 of the second group B2 can substantially correspond to color point Pb2, and the first light-emitting unit 100 of the third group B3 can substantially correspond to color point Pb3. Furthermore, the second light-emitting unit 200 of the fourth group G1 can correspond to color point Pg1, the second light-emitting unit 200 of the fifth group G2 can correspond to color point Pg2, and the second light-emitting unit 200 of the sixth group G3 can correspond to color point Pg3. Therefore, as in step S400 and... Figure 4 and Figure 5As shown, by matching the first group B1 with a shorter peak wavelength corresponding to color point Pb1 with the fourth group G1 with a shorter peak wavelength corresponding to color point Pg1, matching the second group B2 with an intermediate peak wavelength corresponding to color point Pb2 with the fifth group G2 with an intermediate peak wavelength corresponding to color point Pg2, and matching the third group B3 with a longer peak wavelength corresponding to color point Pb3 with the sixth group G3 with a longer peak wavelength corresponding to color point Pg3, the color points of the manufactured display devices DE1, DE2, and DE3 can all be aligned with the target color point Pt.

[0036] In some embodiments, in step S400, one of a portion of the transferred plurality of first light-emitting units 100 may have a first peak wavelength, and another portion of the aforementioned first light-emitting unit 100 may have a second peak wavelength, and the difference between the first peak wavelength and the second peak wavelength may be less than 2 nanometers, but is not limited thereto. That is, according to one embodiment, the difference between the peak wavelengths of different light-emitting units in the same group may be less than 2 nanometers. Specifically, for example, one first light-emitting unit 100 in the first group B1 may have a first peak wavelength, and another first light-emitting unit 100 in the first group B1 may have a second peak wavelength, and the difference between the first peak wavelength and the second peak wavelength may be less than 2 nanometers. Similarly, the difference between the peak wavelength of one portion of the transferred plurality of second light-emitting units 200 and the peak wavelength of another may be less than 2 nanometers, but is not limited thereto. Specifically, for example, one second light-emitting unit 200 in the fourth group G1 may have a first peak wavelength, and another second light-emitting unit 200 in the fourth group G1 may have a second peak wavelength, and the difference between the first peak wavelength and the second peak wavelength may be less than 2 nanometers. In other words, according to the present invention, when the optical characteristic values ​​of the light-emitting units in the same group are similar to each other, for example, when the optical characteristic value is the peak wavelength, the difference in peak wavelength between the light-emitting units in the same group can be less than 2 nanometers, but the present invention is not limited to the above.

[0037] In some embodiments, the optical characteristic value may be brightness. For example, the brightness can be obtained by providing the same energy to each first light-emitting unit 100 and each second light-emitting unit 200 through electroluminescence or photoluminescence and measuring it. Based on the brightness of each first light-emitting unit 100 and each second light-emitting unit 200, the first light-emitting units 100 and the second light-emitting units 200 can be divided into multiple groups. For example, the average brightness L1 of the multiple first light-emitting units 100 as a whole can be measured, and then the brightness of each first light-emitting unit 100 can be measured separately. After comparing the brightness of each first light-emitting unit 100 with the average brightness L1, the first light-emitting units 100 can be divided into a first group B1 with lower brightness (e.g., brightness 0.7-0.9 times the average brightness L1), a second group B2 with intermediate brightness (e.g., brightness 0.9-1.1 times the average brightness L1), and a third group B3 with higher brightness (e.g., brightness 1.1-1.3 times the average brightness L1). Similarly, the average brightness L2 of the entire group of multiple second light-emitting units 200 can be measured, and the brightness of each second light-emitting unit 200 can be measured separately. Then, the brightness of each second light-emitting unit 200 can be compared with the average brightness L2. The second light-emitting units 200 can be divided into a fourth group G1 with lower brightness (e.g., brightness is 0.7-0.9 times the average brightness L2), a fifth group G2 with intermediate brightness (e.g., brightness is 0.9-1.1 times the average brightness L2), and a sixth group G3 with higher brightness (e.g., brightness is 1.1-1.3 times the average brightness L2), but this is not a limitation.

[0038] According to some embodiments, such as step S400 and Figure 4 As shown, a first group B1 with lower brightness can be transferred to the same target substrate SB1 along with a fourth group G1 with lower brightness; a second group B2 with intermediate brightness can be transferred to the same target substrate SB2 along with a fifth group G2 with intermediate brightness; and a third group B3 with higher brightness can be transferred to the same target substrate SB3 along with a sixth group G3 with higher brightness. In this way, the color dots of the manufactured display device DE1 including the target substrate SB1 can be aligned with the target color dots, the color dots of the display device DE2 including the target substrate SB2 can be aligned with the target color dots, and the color dots of the display device DE3 including the target substrate SB3 can be aligned with the target color dots. Furthermore, this reduces the brightness difference within a single target substrate SB, facilitating subsequent brightness adjustment or compensation, thereby improving the color uniformity of the displayed image. In some embodiments, the average brightness of the light-emitting units as a whole in one or more growth substrates can be measured, and the brightness of each light-emitting unit can be measured separately. Then, the brightness of each light-emitting unit is compared with the average brightness and grouped, but this is not a limitation.

[0039] In some embodiments, the optical characteristic value may be a combination of peak wavelength and brightness. Based on the peak wavelength and brightness of each first light-emitting unit 100 and each second light-emitting unit 200, the first light-emitting unit 100 and the second light-emitting unit 200 may be divided into multiple groups. That is, the first light-emitting units 100 within the same peak wavelength band and the same brightness range may be grouped into one group, and the second light-emitting units 200 within the same peak wavelength band and the same brightness range may be grouped into another group. For example, the first light-emitting unit 100 can be divided into groups with peak wavelengths of 454-455.9 nm and brightness 0.7-0.9 times that of the average brightness L1; groups with peak wavelengths of 454-455.9 nm and brightness 0.9-1.1 times that of the average brightness L1; groups with peak wavelengths of 454-455.9 nm and brightness 1.1-1.3 times that of the average brightness L1; groups with peak wavelengths of 456-457.9 nm and brightness 0.7-0.9 times that of the average brightness L1; and groups with peak wavelengths of 456-457.9 nm and brightness 0.7-0.9 times that of the average brightness L1. Groups of light-emitting units 200 can be formed, including those with a peak wavelength of 456-457.9 nm and a brightness 0.9-1.1 times that of the average brightness L1; those with a peak wavelength of 458-460.9 nm and a brightness 1.1-1.3 times that of the average brightness L1; those with a peak wavelength of 458-460.9 nm and a brightness 0.7-0.9 times that of the average brightness L1; those with a peak wavelength of 458-460.9 nm and a brightness 0.9-1.1 times that of the average brightness L1; and those with a peak wavelength of 458-460.9 nm and a brightness 1.1-1.3 times that of the average brightness L1, but not limited to these groups. Similarly, the second light-emitting units 200 can also be divided into multiple groups. Accordingly, the first light-emitting units 100 of one group and the second light-emitting units 200 of one group can be transferred to the target substrate SB to align the color dots of the display device DE with the target color dots.

[0040] In some embodiments, the optical characteristic values ​​may be color coordinate values. Based on the peak wavelength and brightness of each first light-emitting unit 100 and each second light-emitting unit 200, the color coordinate values ​​corresponding to the light emitted by each first light-emitting unit 100 and each second light-emitting unit 200 can be calculated, or the color coordinate values ​​of each first light-emitting unit 100 and each second light-emitting unit 200 can be obtained by measurement using a colorimeter. Based on the color coordinate values ​​of each first light-emitting unit 100 and each second light-emitting unit 200, the first light-emitting units 100 and the second light-emitting units 200 can be divided into multiple groups. Accordingly, one group of first light-emitting units 100 and one group of second light-emitting units 200 can be transferred to the target substrate SB so that the color dots of the display device DE are aligned with the target color dots.

[0041] Please refer to Figures 6 to 8 . Figures 6 to 8This is a partial process diagram of a method for manufacturing a display device according to the present invention. In some embodiments, the transfer step S400 may further include the following steps: Figure 6 As shown, a portion of the first light-emitting unit 100 (e.g., the first light-emitting units 100 of the first group B1, the second group B2, or the third group B3) can be transferred to different first carrier plates 300. For example, the first light-emitting units 100 of the first group B1 can be transferred from the growth substrate 110 to the first carrier plate 310, the first light-emitting units 100 of the second group B2 can be transferred from the growth substrate 110 to the first carrier plate 320, and the first light-emitting units 100 of the third group B3 can be transferred from the growth substrate 110 to the first carrier plate 330, so that the same group of first light-emitting units 100 are on the same first carrier plate 300. Similarly, a portion of the second light-emitting unit 200 (e.g., the second light-emitting units 200 of the fourth group G1, the fifth group G2, or the sixth group G3) can also be transferred to different second carrier plates 400 (e.g., the first group B1, the second group G2, or the third group G3). Figure 8 (as illustrated), for example, it can be based on something similar to Figure 6 The method shown involves transferring different groups of second light-emitting units 200 from the growth substrate 210 to different second carrier plates 400, so that the same group of second light-emitting units 200 are present on the same second carrier plate 400. For example, the second light-emitting units 200 of the fourth group G1 can be transferred from the growth substrate 210 to the second carrier plate 400.

[0042] In some embodiments, after transferring a portion (e.g., a group of first light-emitting units 100) on a growth substrate 110 to a first carrier plate 300, a portion of first light-emitting units 100 from one or more other growth substrates corresponding to the same group can be added to the first carrier plate 300. Specifically, as... Figure 6 As shown, a first light-emitting unit 100 (B1) belonging to the first group B1 on one growth substrate can be transferred to the first carrier plate 310, and a first light-emitting unit 100 (B1a) (shown in dashed frame) belonging to the first group B1 on another growth substrate can be transferred to the same first carrier plate 310. In this way, the first carrier plate 310 can have first light-emitting units 100 of the same group B1 transferred from different growth substrates, forming an array of first light-emitting units 100. That is, the first light-emitting units 100 transferred to the first carrier plate 310 can be transferred from at least two growth substrates 110, but are not limited thereto. The term "corresponding to the same group" refers to light-emitting units having the same range of optical characteristic values ​​when grouping light-emitting units according to the above-described method of the present invention. Figure 6As shown, the first light-emitting unit 100(B1) and the first light-emitting unit 100(B1a) transferred to the first carrier plate 310 belong to the same group B1.

[0043] Next, please refer to Figure 7 and refer to them together. Figure 6 and Figure 4 The first light-emitting units 100 are transferred from the first carrier plate 300 to the target substrate SB. For example, the first light-emitting units 100 of the first group B1 can be transferred from the first carrier plate 310 to the target substrate SB1, the first light-emitting units 100 of the second group B2 can be transferred from the first carrier plate 320 to the target substrate SB2, and the first light-emitting units 100 of the third group B3 can be transferred from the first carrier plate 330 to the target substrate SB3. In some embodiments, such as Figure 7 As shown, for example (but not limited to), the first light-emitting unit 100 of the first group B1 on the first carrier plate 300 can be grasped by the transfer element ST and then placed on the target substrate SB, but is not limited thereto. Furthermore, as Figure 8 As shown, the second light-emitting unit 200 of the aforementioned portion is transferred from the second carrier plate 400 to the target substrate SB. For example, (but not limited to) the second light-emitting unit 200 of the fourth group G1 on the second carrier plate 400 can be picked up by the transfer element ST and then placed on the target substrate SB, but it is not limited thereto.

[0044] In some embodiments, damaged first light-emitting units 100 may be excluded, for example, by first removing damaged first light-emitting units 100 from the growth substrate 110 and then transferring undamaged first light-emitting units 100, but this is not limited to this. In some embodiments, when transferring a portion of the first light-emitting units 100 (e.g., first light-emitting units 100 of the first group B1, second group B2, or third group B3) from the growth substrate 110 to the first carrier plate 300, only the good (undamaged) first light-emitting units 100 may be transferred, and damaged first light-emitting units 100 may not be transferred, but this is not limited to this. In some embodiments, after transferring a portion of the first light-emitting units 100 from the growth substrate 110 to the first carrier plate 300, damaged first light-emitting units 100 may be removed from the first carrier plate 300, but this is not limited to this. Similarly, damaged second light-emitting units 200 may also be excluded, for example, by excluding damaged second light-emitting units 200 in any of the above-described manner, but this is not a limitation.

[0045] Please refer to Figure 9 , Figure 9 This is a schematic diagram of a portion of the manufacturing process of the display device of the present invention. Figure 9As shown, in some embodiments, after a portion of the first light-emitting unit 100 (e.g., the first light-emitting units 100 of the first group B1, the second group B2, or the third group B3) and / or a portion of the second light-emitting unit 200 (e.g., the second light-emitting units 200 of the fourth group G1, the fifth group G2, or the sixth group G3) is transferred to the target substrate SB (e.g. Figure 8 As shown, the aforementioned portions of the first light-emitting unit 100 and / or the aforementioned portions of the second light-emitting unit 200 can also be electrically connected to the target substrate SB through a first bonding process. For example, the first bonding process can be performed through a bonding element BO to achieve electrical connection of the components. The bonding element BO can be, for example, an imprint element, and the first bonding process can include, for example, heating and pressurizing steps, but is not limited thereto.

[0046] For example, the target substrate SB may include a circuit layer (not shown), which may include, for example, circuits, wires, electronic components, and / or bonding pads, but is not limited thereto. The circuit layer in the target substrate SB may include driving elements, which may be thin-film transistors and may be electrically connected to the light-emitting units. After transferring the first light-emitting unit 100 and / or the second light-emitting unit 200 to the target substrate SB, a first bonding process may be performed through bonding element BO to electrically connect the first electrode 150 and the second electrode 160 of each first light-emitting unit 100 and / or the first electrode 250 and the second electrode 260 of each second light-emitting unit 200 to the circuits or electronic components in the circuit layer of the target substrate SB, for example, bonding pads, bumps, solder, or other conductive materials may be used to electrically connect the electrodes of the first light-emitting unit 100 and the second light-emitting unit 200 to the thin-film transistors in the circuit layer, but is not limited thereto.

[0047] In some embodiments, the target substrate SB may include a conductive layer (not shown), through which the first light-emitting unit 100 and / or the second light-emitting unit 200 are electrically connected to the circuit layer of the target substrate SB. The conductive layer may be, for example, anisotropic conductive film (ACF), but is not limited thereto. In detail, when transferring a portion of the first light-emitting unit 100 and / or a portion of the second light-emitting unit 200 to the target substrate SB, a conductive layer may first be formed on the target substrate SB, and the first light-emitting unit 100 and / or the second light-emitting unit 200 may be placed on the conductive layer. The conductive layer may be adhesive to temporarily fix the first light-emitting unit 100 and / or the second light-emitting unit 200, but at this time the first light-emitting unit 100 and / or the second light-emitting unit 200 are not electrically connected to the target substrate SB. Subsequently, during the first bonding process via bonding element BO, this conductive layer hardens over time and with increasing temperature. Simultaneously, the conductive material in the conductive layer, under pressure, enables the first electrode 150 and second electrode 160 of the first light-emitting unit 100 and / or the first electrode 250 and second electrode 260 of the second light-emitting unit 200 to be electrically connected to the target substrate SB via the conductive layer, for example, to the circuit layer on the surface of the target substrate SB. Furthermore, the electrical connection status can be detected during the first bonding process. If an abnormality is detected, it can be directly repaired, for example, by removing or replacing the light-emitting unit with the abnormal electrical connection, or by adding a light-emitting unit adjacent to the light-emitting unit with the abnormal electrical connection, but not limited to these methods.

[0048] The following describes the manufacturing process of the display device, which includes three different colored light-emitting units. Please refer to [link / reference]. Figure 10 and Figure 11 and cooperate Figures 1 to 3 and Figure 5 . Figure 10 This is a top view of the third light-emitting unit on the growth substrate according to an embodiment of the present invention. Figure 11 This is a top view schematic diagram of a display device according to an embodiment of the present invention. Figure 10 As shown, in some embodiments, the method for manufacturing the display device DE of the present invention may further include: providing a plurality of third light-emitting units 500, wherein the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 500 are configured to emit light of different colors, for example, the first light-emitting unit 100 may be configured to emit blue light, the second light-emitting unit 200 may be configured to emit green light, and the third light-emitting unit 500 may be configured to emit red light, but is not limited thereto. The plurality of third light-emitting units 500 may be arranged in an array on a growth substrate 510, which may be, for example, a wafer or an epitaxial substrate, but is not limited thereto. Figure 12As shown, each third light-emitting unit 500 may include a first semiconductor layer (e.g., an N-type semiconductor layer) 520, a light-emitting layer 530, a second semiconductor layer (e.g., a P-type semiconductor layer) 540, a first electrode 550, and a second electrode 560 (e.g., ...). Figure 12 (As illustrated). The third light-emitting unit 500 may include, for example, an inorganic light-emitting diode, a sub-millimeter inorganic light-emitting diode, a micro inorganic light-emitting diode, a quantum dot light-emitting diode, or an organic light-emitting diode, but is not limited to the above, and the third light-emitting unit 500 may also have other structures or include other types of light-emitting elements.

[0049] Next, after providing the plurality of third light-emitting units 500, optical characteristic values ​​of each third light-emitting unit 500 can be obtained, wherein the obtained optical characteristic values ​​may be, for example, peak wavelength, luminance, a combination of peak wavelength and luminance, or chromaticity coordinate values. Furthermore, the optical characteristic values ​​of each third light-emitting unit 500 can be obtained by detecting each third light-emitting unit 500. This detection can be the detection performed on the first light-emitting unit 100 and the second light-emitting unit 200 as described above, and will not be repeated here.

[0050] Then, as Figure 11 As shown, after obtaining the optical characteristic values ​​of each third light-emitting unit 500, a portion of the third light-emitting unit 500 can be transferred to the target substrate SB based on the obtained optical characteristic values. In some embodiments, a portion of the first light-emitting unit 100, a portion of the second light-emitting unit 200, and a portion of the third light-emitting unit 500 can be transferred to the target substrate SB to align the color dots of the display device DE with the target color dots. The target color dot can be a target white dot, for example, a white dot D65 (color coordinates (0.3127, 0.3290)). The color coordinates of the color dots of the manufactured display device can be, for example, (0.3127±0.01, 0.3290±0.01) or (0.3127±0.02, 0.3290±0.02), but are not limited thereto. In detail, based on the obtained optical characteristic values ​​of each third light-emitting unit 500, the third light-emitting units 500 can be divided into multiple groups. Figure 10 As shown, in some embodiments, the multiple third light-emitting units 500 can be divided into a seventh group R1 (represented by a cross-shaped pattern with the lowest density), an eighth group R2 (represented by a cross-shaped pattern with a medium density), and a ninth group R3 (represented by a cross-shaped pattern with the highest density). The third light-emitting units 500 in the seventh group R1, eighth group R2, and ninth group R3 correspond to optical characteristic values ​​within different numerical ranges. Third light-emitting units 500 within the same group correspond to optical characteristic values ​​within the same numerical range. However, the number of groups is not limited to the above; the third light-emitting units 500 can be divided into multiple groups according to actual needs.

[0051] like Figure 11 As shown, after dividing the first light-emitting unit 100, second light-emitting unit 200, and third light-emitting unit 500 into multiple groups based on the obtained optical characteristic values ​​of each first light-emitting unit 100, second light-emitting unit 200, and third light-emitting unit 500, a portion of the first light-emitting unit 100 (e.g., the first light-emitting unit 100 of the first group B1), a portion of the second light-emitting unit 200 (e.g., the second light-emitting unit 200 of the fourth group G1), and a portion of the third light-emitting unit 500 (e.g., the third light-emitting unit 500 of the seventh group R1) can be transferred to the target substrate SB4 of the display device DE4, so that the color dots of the display device DE4 can be aligned with the target white dots. Furthermore, the first light-emitting unit 100 of the second group B2, the second light-emitting unit 200 of the fifth group G2, and the third light-emitting unit 500 of the eighth group R2 can be transferred to another target substrate (not shown) of another display device. The first light-emitting unit 100 of the third group B3, the second light-emitting unit 200 of the sixth group G3, and the third light-emitting unit 500 of the ninth group R3 can be transferred to another target substrate (not shown) of another display device, so that the manufactured display device DE is aligned with the target color point.

[0052] In some embodiments, the optical characteristic values ​​of each third light-emitting unit 500 obtained may be peak wavelengths. Based on the magnitude of the peak wavelength of each third light-emitting unit 500, the third light-emitting units 500 can be divided into multiple groups. For example, according to the Rec. 2020 color standard, the peak wavelength of red light is 620 nm, and multiple third light-emitting units 500 can be divided into a seventh group R1 with shorter peak wavelengths (e.g., peak wavelengths of 617-618.9 nm), an eighth group R2 with intermediate peak wavelengths (e.g., peak wavelengths of 619-620.9 nm), and a ninth group R3 with longer peak wavelengths (e.g., peak wavelengths of 621-622.9 nm). Furthermore, as... Figure 5 As shown, the third light-emitting unit 500 of the seventh group R1 can roughly correspond to color point Pr1, the third light-emitting unit 500 of the eighth group R2 can roughly correspond to color point Pr2, and the third light-emitting unit 500 of the ninth group R3 can roughly correspond to color point Pr3. According to some embodiments, the first group B1 with a shorter peak wavelength corresponding to color point Pb1 can be paired with the fourth group G1 with a shorter peak wavelength corresponding to color point Pg1 and the seventh group R1 with a shorter peak wavelength corresponding to color point Pr1 (e.g., ...). Figure 11The display device DE4 shown aligns the second group B2 with the intermediate peak wavelength corresponding to color point Pb2 with the fifth group G2 with the intermediate peak wavelength corresponding to color point Pg2 and the eighth group R2 with the intermediate peak wavelength corresponding to color point Pr2. It also aligns the third group B3 with the longer peak wavelength corresponding to color point Pb3 with the sixth group G3 with the longer peak wavelength corresponding to color point Pg3 and the ninth group R3 with the longer peak wavelength corresponding to color point Pr3. In this way, all the color points of the manufactured display device DE are aligned with the target color point Pt1. The target color point Pt1 can be, for example, the white point D65, but is not limited to this.

[0053] In some embodiments, the third light-emitting units 500 may be divided into multiple groups based on the combination of brightness, peak wavelength and brightness or color coordinate values ​​of each third light-emitting unit 500, and the third light-emitting units 500 of one group, the first light-emitting units 100 of one group and the second light-emitting units 200 of one group may be transferred to the target substrate SB (see reference). Figure 12 This is done so that the color dots of the manufactured display device DE are aligned with the target color dots. The grouping method can refer to the grouping method of the first light-emitting unit 100 and the second light-emitting unit 200 in the previous embodiment, and will not be repeated here. Specifically, the first light-emitting unit 100 belonging to the first group B1, the second light-emitting unit 200 belonging to the fourth group G1, and the third light-emitting unit 500 belonging to the seventh group R1 can be transferred to the target substrate SB.

[0054] Please refer to Figures 12 to 13 and cooperate Figures 6 to 9 . Figures 12 to 13 This is a schematic diagram of another part of the process of manufacturing the display device according to the present invention. Figure 9 Based on the above description, this portion of the first light-emitting unit 100 can be electrically connected to the target substrate SB via a first bonding process. According to some embodiments, such as... Figure 9 Based on the above description, the first light-emitting unit 100 and the second light-emitting unit 200 can be electrically connected to the target substrate SB via a first bonding process. In some embodiments, a portion of the first light-emitting unit 100 (e.g., the first light-emitting units 100 of the first group B1, the second group B2, or the third group B3) and / or a portion of the second light-emitting unit 200 (e.g., the second light-emitting units 200 of the fourth group G1, the fifth group G2, or the sixth group G3) can be electrically connected to the target substrate SB via a first bonding process.

[0055] Next, the transfer procedure for the third light-emitting unit 500 is performed. Figure 12 The process of transferring a portion of the third light-emitting unit 500 from the third carrier plate 600 to the target substrate SB using the transfer element ST is illustrated. More specifically, as... Figure 12 As shown, the aforementioned portion of the third light-emitting unit 500 can be transferred from the third carrier plate 600 to the target substrate SB. For example, the third light-emitting unit 500 can be picked up from the third carrier plate 600 by the transfer element ST and then placed onto the target substrate SB. Specifically, a portion of the third light-emitting unit 500 (e.g., the third light-emitting units 500 of the seventh group R1, the eighth group R2, or the ninth group R3) can be transferred to different third carrier plates 600 respectively, for example, according to a method similar to... Figure 6 The method shown involves transferring different groups of third light-emitting units 500 from the growth substrate 510 to different third carrier plates 600. Thus, the same group of third light-emitting units 500 can be present on the same third carrier plate 600. Then, the aforementioned portion of the third light-emitting units 500 is transferred from the third carrier plate 600 to the target substrate SB.

[0056] Next, as Figure 13 As shown, a second bonding process can be performed via bonding element BO to electrically connect the aforementioned portion of the third light-emitting unit 500 to the target substrate SB. For example, a portion of the third light-emitting unit 500 (e.g., the third light-emitting unit 500 of group 7 R1, group 8 R2, or group 9 R3) can be electrically connected to the target substrate SB via the second bonding process. For example, the first electrode 550 and the second electrode 560 of the third light-emitting unit 500 can be electrically connected to a circuit or electronic component in a circuit layer (not shown) of the target substrate SB, or the first electrode 550 and the second electrode 560 of the third light-emitting unit 500 can be electrically connected to a circuit layer on the surface of the target substrate SB through a conductive layer (not shown).

[0057] According to some embodiments, a portion of the first light-emitting unit is electrically connected to the target substrate via a first bonding process, and a portion of the second light-emitting unit is electrically connected to the same target substrate via a second bonding process. Specifically, as... Figure 13 As shown, the first light-emitting unit performing the first bonding process can be the blue light-emitting unit 100 of the first group B1 and the green light-emitting unit 200 of the fourth group G1, and the second light-emitting unit performing the second bonding process can be the red light-emitting unit 500 of the seventh group R1, but the present invention is not limited thereto. According to some embodiments, the first light-emitting unit can be configured to emit blue light, and the second light-emitting unit can be configured to emit green or red light. According to some embodiments, the first light-emitting unit can be configured to emit blue light, and the second light-emitting unit can be configured to emit green and / or red light. According to some embodiments, the first light-emitting unit can be configured to emit blue and / or green light, and the second light-emitting unit can be configured to emit red light.

[0058] In some embodiments, the material comprising the first semiconductor layer 520 of the third light-emitting unit 500 may be different from the material comprising the first semiconductor layer 120 of the first light-emitting unit 100 and / or the material comprising the first semiconductor layer 220 of the second light-emitting unit 200. Thus, the thickness of the first semiconductor layer 520 of the third light-emitting unit 500 may be different from the thickness of the first semiconductor layer 120 of the first light-emitting unit 100 and / or the thickness of the first semiconductor layer 220 of the second light-emitting unit 200. For example, as... Figure 13 As shown, the thickness of the first semiconductor layer 520 of the third light-emitting unit 500 may be greater than the thickness of the first semiconductor layer 120 of the first light-emitting unit 100 and the thickness of the first semiconductor layer 220 of the second light-emitting unit 200. Alternatively, the total thickness of the third light-emitting unit 500 may be greater than the total thickness of the first light-emitting unit 100 and greater than the total thickness of the second light-emitting unit 200. Therefore, as described above, the first light-emitting unit 100 and the second light-emitting unit 200 can be electrically connected to the target substrate SB via the first bonding process, and the third light-emitting unit 500 can be electrically connected to the target substrate SB via the second bonding process, but this is not a limitation. The first bonding process and the second bonding process may be performed at different times; for example, the second bonding process may be later than the first bonding process. The first bonding process and the second bonding process may include, for example, heating and pressurizing steps, but this is not a limitation.

[0059] In summary, according to the method for manufacturing a display device of the present invention, by presetting the target color point of the display device and transferring a portion of the first light-emitting unit and a portion of the second light-emitting unit to the target substrate based on the optical characteristic values ​​of each light-emitting unit, the color point of the manufactured display device can be aligned with the target color point. According to some embodiments, the brightness difference within the target substrate of the manufactured display device can be reduced, thereby improving the color uniformity of the displayed image.

[0060] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Those skilled in the art will recognize that the present invention can have various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing a display device, characterized in that, include: A plurality of first light-emitting units and a plurality of second light-emitting units are provided, the plurality of first light-emitting units and the plurality of second light-emitting units being configured to emit light of different colors; Obtain an optical characteristic value for each of the first light-emitting units and each of the second light-emitting units; A target color point is preset in a first display device and a second display device; The plurality of first light-emitting units are divided into a first group and a second group, wherein the first group corresponds to an optical characteristic value of a first numerical range, the second group corresponds to an optical characteristic value of a second numerical range, and the optical characteristic value of the first numerical range is smaller than the optical characteristic value of the second numerical range. The plurality of second light-emitting units are divided into a third group and a fourth group, wherein the third group corresponds to an optical characteristic value of a third numerical range, the fourth group corresponds to an optical characteristic value of a fourth numerical range, and the optical characteristic value of the third numerical range is smaller than the optical characteristic value of the fourth numerical range. A portion of the first group of the plurality of first light-emitting units and a portion of the third group of the plurality of second light-emitting units are transferred to a first target substrate so that a first color dot of the first display device is aligned with the target color dot; as well as A portion of the second group of the plurality of first light-emitting units and a portion of the fourth group of the plurality of second light-emitting units are transferred to a second target substrate so that a second color dot of the second display device is aligned with the target color dot.

2. The method according to claim 1, characterized in that, The optical characteristic values ​​of each first light-emitting unit and each second light-emitting unit are obtained by performing a detection on each of the first light-emitting unit and each of the second light-emitting units.

3. The method according to claim 2, characterized in that, The detection was performed using an electroluminescence detector.

4. The method according to claim 2, characterized in that, The detection was performed using photoluminescence detection.

5. The method according to claim 1, characterized in that, The step of transferring a portion of the first group of the plurality of first light-emitting units and a portion of the third group of the plurality of second light-emitting units to the first target substrate includes: The portion of the first group of the plurality of first light-emitting units is transferred to a first carrier plate; The portion of the third group of the plurality of second light-emitting units is transferred to a second carrier plate; The portion of the first group of the plurality of first light-emitting units is transferred from the first carrier plate to the first target substrate; and The portion of the third group of the plurality of second light-emitting units is transferred from the second carrier plate to the first target substrate.

6. The method according to claim 5, characterized in that, This portion of the first group of the plurality of first light-emitting units is transferred from at least two growth substrates.

7. The method according to claim 1, characterized in that, Also includes: A plurality of third light-emitting units are provided, wherein the plurality of first light-emitting units, the plurality of second light-emitting units, and the plurality of third light-emitting units are configured to emit light of different colors; Obtain an optical characteristic value for each of the third light-emitting units; as well as A portion of the plurality of third light-emitting units is transferred to the first target substrate; The target color point is a target white point.

8. The method according to claim 7, characterized in that, The optical characteristic value of each third light-emitting unit is obtained by performing a test on each of the third light-emitting units.

9. The method according to claim 1, characterized in that, One of the portions of the first group of the plurality of first light-emitting units has a first peak wavelength, and another portion of the portion of the first group of the plurality of first light-emitting units has a second peak wavelength, and the difference between the first peak wavelength and the second peak wavelength is less than 2 nanometers.

10. The method according to claim 1, characterized in that, The optical characteristic value is the peak wavelength.

11. The method according to claim 1, characterized in that, The optical characteristic value is brightness.

12. The method according to claim 1, characterized in that, The optical characteristic value is the combination of peak wavelength and brightness.

13. The method according to claim 1, characterized in that, The optical characteristic value is the chromaticity coordinate value.

14. The method according to claim 1, characterized in that, Also includes: The portion of the first group of the plurality of first light-emitting units is electrically connected to the first target substrate via a first bonding process; as well as The portion of the third group of the plurality of second light-emitting units is electrically connected to the first target substrate via a second bonding process.

15. The method according to claim 1, characterized in that, The plurality of first light-emitting units are configured to emit blue light, and the plurality of second light-emitting units are configured to emit green or red light.

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