A display panel, a preparation method thereof, and a display device

Abstract

The present invention discloses a display panel, a preparation method thereof, and a display device. The display panel includes an array substrate; a plurality of sub-pixel units located on the array substrate; the sub-pixel units include a main light-emitting element and a spare light-emitting element; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength difference within the second wavelength difference range. In this application, the overall fluctuation range of the peak wavelength of the main light-emitting element is small, and the chromaticity and luminous brightness of the main light-emitting element are relatively consistent, which is beneficial to improving display uniformity. In addition, using the light-emitting element with a large fluctuation range of the peak wavelength as the spare light-emitting element can also improve the utilization rate of the light-emitting element and reduce waste in the manufacturing process of the light-emitting element.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technologies, and in particular, to a display panel, a method for manufacturing the same, and a display device. Background Art

[0002] With the development of display technologies, the types of display devices have gradually increased. Currently, some display devices use light-emitting diodes (LEDs) as light sources. LEDs have advantages such as high luminous brightness and high stability. However, due to process fluctuations during the manufacturing process of LED chips, existing display devices using LEDs as light sources have problems with poor display uniformity. Summary of the Invention

[0003] In view of this, the present invention provides a display panel, a method for manufacturing the same, and a display device, so as to improve the display uniformity of the display panel and enhance the display effect; at the same time, it can improve the chip utilization rate and reduce the chip manufacturing cost.

[0004] In a first aspect, embodiments of the present invention provide a display panel, including:

[0005] An array substrate;

[0006] A plurality of sub-pixel units located on the array substrate, the plurality of sub-pixel units being arranged in an array along a first direction and a second direction, the first direction intersecting the second direction; the sub-pixel unit includes a main light-emitting element and a spare light-emitting element, and the spare light-emitting element is configured to emit light when the main light-emitting element fails;

[0007] Wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; at least some of the absolute values of the wavelength differences within the first wavelength difference range are less than the absolute value of the wavelength difference within the second wavelength difference range.

[0008] In a second aspect, embodiments of the present invention provide a method for manufacturing a display panel for manufacturing the display panel according to the first aspect of the present invention, and the manufacturing method includes:

[0009] Screening the light-emitting elements according to the peak wavelength;

[0010] The light-emitting elements are divided into main light-emitting elements and spare light-emitting elements according to the peak wavelength screening results; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength difference within the second wavelength difference range;

[0011] Transfer a plurality of the main light-emitting elements onto the array substrate;

[0012] Transfer a plurality of the spare light-emitting elements onto the array substrate.

[0013] In a third aspect, an embodiment of the present invention further provides a display device, including the display panel described in the first aspect of the present invention.

[0014] The display panel provided by the embodiment of the present invention includes an array substrate; a plurality of sub-pixel units located on the array substrate, the plurality of sub-pixel units are arranged in an array along a first direction and a second direction, and the first direction and the second direction intersect; the sub-pixel unit includes a main light-emitting element and a spare light-emitting element, and the spare light-emitting element is used to emit light when the main light-emitting element fails; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength difference within the second wavelength difference range. In this setting, compared with the spare light-emitting element, the peak wavelength of the main light-emitting element is closer to the standard peak wavelength, the overall fluctuation range of the peak wavelength of the main light-emitting element is smaller, the chromaticity and the luminous brightness of the main light-emitting element are more consistent, which is beneficial to improving the display uniformity of the display panel. In addition, using the light-emitting element with a larger fluctuation range of the peak wavelength as the spare light-emitting element can also improve the utilization rate of the light-emitting element, reduce the waste in the manufacturing process of the light-emitting element, and reduce the manufacturing cost of the light-emitting element. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0016] Figure 2 It is a partial top view structural diagram of a display panel provided by an embodiment of the present invention;

[0017] Figure 3 It is a partial cross-sectional structural diagram of a display panel provided by an embodiment of the present invention;

[0018] Figure 4 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0019] Figure 5 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0020] Figure 6 A schematic structural diagram of yet another display panel provided by an embodiment of the present invention;

[0021] Figure 7 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0022] Figure 8 A schematic structural diagram of yet another display panel provided by an embodiment of the present invention;

[0023] Figure 9 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0024] Figure 10 A flowchart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0025] Figure 11 A schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0027] Taking a Micro Light-Emitting Diode (Micro LED) display panel as an example, currently, the Micro LED display panel is generally prepared by Micro Transfer Printing technology. The specific preparation process is as follows: First, Micro LED chips (light-emitting elements) are grown on a sapphire-like substrate. Then, the Micro LED chips are separated from the sapphire-like substrate through Laser Lift-off (LLO). Subsequently, a patterned Polydimethylsiloxane (PDMS) transfer head is used to adsorb the Micro LED chips from the sapphire-like substrate, and the PDMS transfer head is aligned with the array substrate. Then, the Micro LED chips adsorbed by the PDMS transfer head are attached to the preset positions on the array substrate, and the PDMS transfer head is peeled off to obtain the Micro LED display panel. Of course, the preparation method of the MicroLED display panel can also be any technology known to those skilled in the art, and the embodiments of the present invention do not limit this.

[0028] Due to process fluctuations during the preparation of Micro LED chips, there is a problem of consistency deviation in the produced Micro LED chips, that is, the wavelengths of the Micro LED chips will fluctuate within a large range. If Micro LED chips with significantly different wavelengths are directly transferred to the array substrate at one time, it will affect the display uniformity of the display device.

[0029] In view of this, the inventor proposes the technical solution in this application. Specifically, the display panel provided in this application includes an array substrate; a plurality of sub-pixel units located on the array substrate, and the plurality of sub-pixel units are arranged in an array along a first direction and a second direction, and the first direction and the second direction intersect; each sub-pixel unit includes a main light-emitting element and a spare light-emitting element, and the spare light-emitting element is used to emit light when the main light-emitting element fails; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength differences within the second wavelength difference range.

[0030] In this setting method, compared with the spare light-emitting element, the peak wavelength of the main light-emitting element is closer to the standard peak wavelength. The overall fluctuation range of the peak wavelength of the main light-emitting element is smaller, and the chromaticity and luminous brightness of the main light-emitting element are more consistent, which is beneficial to improving the display uniformity of the display panel. In addition, using the light-emitting element with a larger peak wavelength fluctuation range as the spare light-emitting element can also improve the utilization rate of the light-emitting element, reduce waste in the manufacturing process of the light-emitting element, and reduce the manufacturing cost of the light-emitting element.

[0031] The above is the core idea of the present invention. Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Figure 1 A schematic structural diagram of a display panel provided by an embodiment of the present invention is shown for reference Figure 1 , in the embodiment of the present invention, the display panel includes: an array substrate 1; a plurality of sub-pixel units 2 located on the array substrate 1, and the plurality of sub-pixel units 2 are arranged in an array along a first direction X and a second direction Y, and the first direction X and the second direction Y intersect; the sub-pixel unit 2 includes a main light-emitting element 3 and a spare light-emitting element 4, and the spare light-emitting element 4 is used for emitting light when the main light-emitting element 3 fails; wherein, the difference between the peak wavelength of the main light-emitting element 3 and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element 4 and the standard peak wavelength is within a second wavelength difference range; the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength difference within the second wavelength difference range.

[0033] Specifically, in the present application, the display panel can be divided into a display area AA and a non-display area NA. The display area AA is used to place light-emitting elements and some signal transmission lines, and the non-display area NA is used for routing, placing functional devices or driving chips, etc., but is not limited thereto. The light-emitting element can be an LED chip. In the embodiment of the present invention, the light-emitting element is described as a Micro LED chip, but in fact, it is not limited thereto.

[0034] The display panel includes an array substrate 1, and the array substrate 1 may include a substrate substrate ( Figure 1 not shown in the figure) and a pixel driving circuit layer ( Figure 1 not shown in the figure) and other conventional set film layers, which are not limited in the embodiment of the present invention. The array substrate 1 in the display area AA includes a plurality of sub-pixel units 2 arranged in an array along a first direction X and a second direction Y. Both the first direction X and the second direction Y are parallel to the extension direction of the array substrate 1, Figure 1Exemplarily, the first direction X and the second direction Y are shown to be perpendicular, where the first direction X is the row direction and the second direction Y is the column direction. The actual setting method is not limited thereto.

[0035] In the embodiments of the present application, the light-emitting elements in the display panel can be divided into main light-emitting elements 3 and spare light-emitting elements 4. Both the main light-emitting element 3 and the spare light-emitting element 4 are provided in each sub-pixel unit 2. In the sub-pixel unit 2, if the main light-emitting element 3 can emit light normally, the spare light-emitting element 4 is not enabled; if the main light-emitting element 3 fails and cannot emit light normally, the spare light-emitting element 4 is enabled to ensure that the display panel can display the picture normally. Figure 1 In [the figure], the main light-emitting elements 3 are represented by dot filling, and the spare light-emitting elements 4 are represented by grid filling. Figure 1 Only the arrangement of the light-emitting elements is shown in [the figure], and other structures in the display panel are not shown. The display panel also includes any structures known to those skilled in the art, and the embodiments of the present invention do not limit this.

[0036] In the embodiments of the present invention, the driving method of the light-emitting elements is not limited, and those skilled in the art can set it according to actual needs. Exemplarily, Figure 2 This is a schematic top view of a partial structure of a display panel provided by an embodiment of the present invention. Figure 3 This is a schematic cross-sectional structure of a partial display panel provided by an embodiment of the present invention. Refer to Figure 2 and Figure 3 , the array substrate 1 also includes a plurality of data lines 11, a plurality of scan lines 12, and a plurality of power voltage signal lines 13. The scan lines 12 and the data lines 11 extend along the first direction X and the second direction Y respectively to define a plurality of sub-pixel units 2. The sub-pixel unit 2 includes a main light-emitting element 3, a spare light-emitting element 4, and a pixel driving circuit 20. The pixel driving circuit 20 is used to drive the main light-emitting element 3 or the spare light-emitting element 4 to emit light. It should be noted that, for clearly showing the connection manner between the sub-pixel unit 2 and the signal lines, Figure 2 only the main light-emitting element 3 and the spare light-emitting element 4 in the sub-pixel unit 2 are shown in [the figure], and other structures are not shown.

[0037] Specifically, continue to refer to Figure 2 and Figure 3, the pixel driving circuit 20 can be disposed on one side surface of the substrate 15. A first electrode 21 and a second electrode 22 are further disposed in the sub-pixel unit 2, and the first electrode 21 and the second electrode 22 are respectively located on the side of the pixel driving circuit 20 away from the substrate 15. Two pins 31 of the main light-emitting element 3 are respectively bonded to a first electrode 21 and a second electrode 22, and two pins 32 of the spare light-emitting element 4 are respectively bonded to a first electrode 21 and a second electrode 22. The main light-emitting element 3 and the spare light-emitting element 4 can be electrically connected to the same first electrode 21, but are not limited thereto. The pixel driving circuit 20 includes at least one thin-film transistor T, and the thin-film transistor T includes a gate G, a source S, and a drain D. The gate G is electrically connected to the scanning line 12, the source S (or the drain D) is electrically connected to the data line 11, and the drain D (or the source S) can be electrically connected to the first electrode 21 bonded to the main light-emitting element 3 or the spare light-emitting element 4. The second electrode 22 can be electrically connected to the power supply voltage signal line 13. Among them, the first electrode 21 can be an anode, and the second electrode 22 can be a cathode, but is not limited thereto.

[0038] A plurality of strobe units 14 can also be disposed in the display panel. The strobe units 14 are disposed in one-to-one correspondence with the sub-pixel units 2. One end of the strobe unit 14 is electrically connected to the power supply voltage signal line 13, and the other end is electrically connected to the sub-pixel unit 2. The strobe unit 14 is used to strobe the main light-emitting element 3 and the power supply voltage signal line 13 or strobe the spare light-emitting element 4 and the power supply voltage signal line 13. When the main light-emitting element 3 in the sub-pixel unit 2 can emit light normally, the strobe unit 14 strobes the power supply voltage signal line 13 and the second electrode 22 bonded to the main light-emitting element 3, and the power supply voltage signal is transmitted to the second electrode 22 of the main light-emitting element; if the main light-emitting element 3 in the sub-pixel unit 2 cannot emit light normally, the strobe unit 14 strobes the power supply voltage signal line 13 and the second electrode 22 bonded to the spare light-emitting element 4. Figure 2 The main light-emitting element 3 in the upper sub-pixel unit 2 shown is faulty, and the main light-emitting element 3 in the lower sub-pixel unit 2 is normal. When the main light-emitting element 3 in the sub-pixel unit 2 can emit light normally, the scanning signal controls the gate G to conduct, and the data signal is transmitted to the first electrode 21 via the source S (or the drain D). At the same time, the second electrode 22 bonded to the main light-emitting element 3 receives the power supply voltage signal, and the main light-emitting element 3 emits light. When the main light-emitting element 3 in the sub-pixel unit 2 cannot emit light normally, the data signal is transmitted to the first electrode 21 in the same manner. At this time, the second electrode 22 bonded to the spare light-emitting element 4 receives the power supply voltage signal, and the spare light-emitting element 4 emits light.

[0039] Of course, the above driving method is only an optional setting method, and the actual setting method is not limited thereto. In the actual application process, those skilled in the art can set any feasible driving method for the main light-emitting element 3 and the spare light-emitting element 4 according to actual needs.

[0040] Among them, the main light-emitting element 3 and the spare light-emitting element 4 within the same sub-pixel unit 2 have the same light-emitting color. That is, each sub-pixel unit 2 emits light of one color. In the display panel, sub-pixel units 2 with three light-emitting colors can be set. For example, red sub-pixel units R, green sub-pixel units G, and blue sub-pixel units B that are alternately arranged along the first direction X can be set, but it is not limited thereto. The light-emitting color, arrangement method, etc. of the sub-pixel unit 2 can be set by those skilled in the art according to actual needs.

[0041] Optionally, regarding the number and arrangement method of the main light-emitting element 3 and the spare light-emitting element 4 within the sub-pixel unit 2, the embodiments of the present invention do not make limitations, and those skilled in the art can design according to actual needs. Figure 1 Exemplarily shown in the figure is that the sub-pixel unit 2 includes one main light-emitting element 3 and one spare light-emitting element 4, and the main light-emitting element 3 and the spare light-emitting element 4 are alternately arranged along the second direction Y. The actual setting method is not limited thereto.

[0042] It should be noted that in this application, before transferring the light-emitting elements to the array substrate 1, the light-emitting elements can be screened first. Specifically, a standard peak wavelength can be established first, and then the light-emitting elements are divided into the main light-emitting element 3 and the spare light-emitting element 4 around the standard peak wavelength, and then the main light-emitting element 3 and the spare light-emitting element 4 are transferred to the array substrate 1 in sequence.

[0043] Specifically, the light-emitting elements are classified into the main light-emitting element 3 and the spare light-emitting element 4 according to the difference between the peak wavelength and the standard peak wavelength. The light-emitting elements with the difference between the peak wavelength and the standard peak wavelength within the first wavelength difference range are used as the main light-emitting element 3; the light-emitting elements with the difference between the peak wavelength and the standard peak wavelength within the second wavelength difference range are used as the spare light-emitting element 4. Among them, the absolute value of at least part of the wavelength difference within the first wavelength difference range is less than the absolute value of the wavelength difference within the second wavelength difference range.

[0044] The absolute value of the wavelength difference represents the value by which the peak wavelength of the light-emitting element differs from the standard peak wavelength. The smaller the absolute value of the wavelength difference, the closer the peak wavelength of the light-emitting element is to the standard peak wavelength. It can also be understood that among the light-emitting elements to be transferred in the same batch, compared with the spare light-emitting element 4, the peak wavelengths of at least some of the main light-emitting elements 3 are closer to the standard peak wavelength of this batch of light-emitting elements. It can be understood that the difference in the peak wavelengths of the light-emitting elements will affect parameters such as the chromaticity of the light-emitting elements. The greater the difference in the peak wavelengths of the light-emitting elements, the greater the emission difference. By using the grading method proposed in this application, compared with the spare light-emitting element 4, the overall peak wavelength of the main light-emitting element 3 is closer to the standard peak wavelength. In this way, the overall fluctuation range of the peak wavelength of the main light-emitting element 3 is smaller, and the chromaticity and emission brightness of the main light-emitting element 3 are more consistent, which is beneficial to improving the display uniformity of the display panel. In addition, using the light-emitting elements with a larger fluctuation range of the peak wavelength as the spare light-emitting element 4 can also improve the utilization rate of the light-emitting elements, reduce waste in the manufacturing process of the light-emitting elements, and reduce the manufacturing cost of the light-emitting elements.

[0045] The fluctuation range of the peak wavelength of the light-emitting element mentioned in the embodiment of the present invention refers to the fluctuation range based on the same standard peak wavelength. A standard peak wavelength can be established for the light-emitting elements to be transferred to the array substrate. The standard peak wavelength can be the average value or the median value of the peak wavelengths of all the light-emitting elements, etc. Then, this batch of light-emitting elements is graded according to the standard peak wavelength and the peak wavelengths of each light-emitting element. The light-emitting elements graded based on the same standard peak wavelength can be either the light-emitting elements produced in the same batch or the light-emitting elements produced in different batches. This embodiment does not make any limitations in this regard. The light-emitting elements produced in the same batch mentioned in this embodiment can refer to the light-emitting elements grown on the same sapphire substrate, but are not limited thereto.

[0046] Optionally, due to fluctuations in the manufacturing process of the light-emitting elements, this application does not limit the specific value of the standard peak wavelength, and those skilled in the art can determine it according to the actual production situation of the light-emitting elements. In addition, for the method of determining the standard peak wavelength, it can be selected by those skilled in the art, and this embodiment of the present invention does not elaborate or limit it.

[0047] In an embodiment of the present invention, a display panel includes an array substrate; a plurality of sub-pixel units located on the array substrate, the plurality of sub-pixel units being arranged in an array along a first direction and a second direction, the first direction and the second direction intersecting; a main light-emitting element and a spare light-emitting element are included in the sub-pixel unit, and the spare light-emitting element is used to emit light when the main light-emitting element fails; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength differences within the second wavelength difference range. In this setting mode, compared with the spare light-emitting element, the peak wavelength of the main light-emitting element is closer to the standard peak wavelength, the overall fluctuation range of the peak wavelength of the main light-emitting element is smaller, and the chromaticity and the luminous brightness of the main light-emitting element are more consistent, which is beneficial to improving the display uniformity of the display panel. In addition, using the light-emitting element with a larger peak wavelength fluctuation range as the spare light-emitting element can also improve the utilization rate of the light-emitting element, reduce the waste in the manufacturing process of the light-emitting element, and reduce the manufacturing cost of the light-emitting element.

[0048] Wherein, for the specific division method of the first wavelength difference range and the second wavelength difference range, the embodiment of the present invention does not make a limitation, and can be set by those skilled in the art according to actual needs. It is only necessary to ensure that the absolute value of at least part of the wavelength differences within the first wavelength difference range is less than the wavelength differences within the second wavelength difference range.

[0049] Exemplarily, in a possible embodiment, the first wavelength difference range may be (-Δλ1, Δλ1), the second wavelength difference range is (-Δλ2, Δλ2), |Δλ1|≤3nm, |Δλ2|≥2nm.

[0050] Specifically, in this embodiment, it can be set that the difference between the peak wavelength of the main light-emitting element 3 and the standard peak wavelength is within the range of (-Δλ1, Δλ1), and the difference between the peak wavelength of the spare light-emitting element 4 and the standard peak wavelength is within the range of (-Δλ2, Δλ2). The maximum absolute value of the peak wavelength in the first wavelength range is |Δλ1|, and the maximum absolute value of the peak wavelength in the second peak wavelength range is |Δλ2|. As an optional range, it can be set that |Δλ1|≤3nm, |Δλ2|≥2nm. That is to say, based on the standard peak wavelength, in this embodiment, it can be set that the peak wavelength fluctuation range of the main light-emitting element 3 is less than or equal to 3nm, and the peak wavelength fluctuation range of the spare light-emitting element 4 is greater than or equal to 2nm.

[0051] It can be understood that the smaller the set range of the first wavelength difference, the lower the yield in the manufacturing process of the light-emitting element and the higher the loss rate of the light-emitting element; while the larger the set range of the first wavelength difference, the luminous uniformity of the main light-emitting element 3 will be affected. Therefore, according to the actual manufacturing process of the light-emitting element and the requirement of luminous uniformity, an upper limit can be set for the peak wavelength fluctuation amplitude of the main light-emitting element 3 in the embodiments of the present application, that is, the fluctuation amplitude is less than or equal to 3 nm, to ensure the luminous uniformity of the main light-emitting element 3. And there is a lower limit for the peak wavelength fluctuation amplitude of the spare light-emitting element 4, that is, the fluctuation amplitude needs to be greater than or equal to 2 nm. Grading the light-emitting elements within this range can not only improve the display uniformity but also greatly reduce the loss rate of the light-emitting elements.

[0052] Exemplarily, in other possible embodiments, it can be set that the absolute value of the wavelength difference within the first wavelength difference range is less than the absolute value of the wavelength difference within the second wavelength difference range.

[0053] Specifically, in the embodiments of the present application, it can also be set that the overall peak wavelength fluctuation amplitude of the main light-emitting element 3 is less than the peak wavelength fluctuation amplitude of the spare light-emitting element 4. Thus, there is a clear division boundary between the peak wavelengths of the main light-emitting element 3 and the spare light-emitting element 4, which is beneficial to the grading work of the light-emitting elements. For example, it can be set that the peak wavelength fluctuation amplitude of the main light-emitting element 3 is less than or equal to 2 nm, and the peak wavelength fluctuation amplitude of the spare light-emitting element 4 is greater than 2 nm, but not limited thereto. Grading the light-emitting elements according to this peak wavelength fluctuation amplitude, the peak wavelength fluctuation amplitude of the main light-emitting element 3 and the peak wavelength fluctuation amplitude of the spare light-emitting element 4 are both relatively stable.

[0054] Exemplarily, in another possible embodiment, the first wavelength difference range is (-Δλ3, Δλ3), the second wavelength difference range is (-Δλ4, Δλ4), |Δλ3| ≤ 2 nm, 2 nm < |Δλ4| ≤ 4 nm.

[0055] Specifically, in this embodiment, it can be set that the difference between the peak wavelength of the main light-emitting element 3 and the standard peak wavelength is within the range of (-Δλ3, Δλ3), and the difference between the peak wavelength of the spare light-emitting element 4 and the standard peak wavelength is within the range of (-Δλ4, Δλ4). The maximum absolute value of the peak wavelength in the first wavelength range is |Δλ3|, and the maximum absolute value of the peak wavelength in the second peak wavelength range is |Δλ4|. As an optional range, it can be set that |Δλ3| ≤ 2 nm, 2 nm < |Δλ4| ≤ 4 nm. That is to say, based on the standard peak-to-peak wavelength, in this embodiment, it can be set that the peak wavelength fluctuation amplitude of the main light-emitting element 3 is less than or equal to 2 nm, and the peak wavelength fluctuation amplitude of the spare light-emitting element 4 is greater than 2 nm and less than or equal to 4 nm.

[0056] Set the upper limit of the peak wavelength fluctuation range of the main light-emitting element 3 to be less than or equal to 2 nm. The peak wavelength of the main light-emitting element 3 has good uniformity, which can better meet the requirements for display uniformity. In addition, set the peak wavelength fluctuation range of the spare light-emitting element 4 to be within the range of 2 to 4 nm, which can not only reduce the loss rate of the light-emitting element, but also ensure that when the spare light-emitting element 4 emits light, the overall light emission uniformity of the light-emitting elements meets the application requirements and avoids large color differences in the display screen.

[0057] Of course, the above divisions of the first wavelength difference range and the second wavelength difference range are all optional setting methods, and the actual division method is not limited to this.

[0058] Optionally, continue to refer to Figure 1 , in the embodiments of the present application, within the same sub-pixel unit 2, the number of main light-emitting elements 3 is the same as the number of spare light-emitting elements 4.

[0059] Specifically, as Figure 1 shown, in a possible embodiment, within each sub-pixel unit 2, the same number of main light-emitting elements 3 and spare light-emitting elements 4 can be set. For example Figure 1 , in [example], one main light-emitting element 3 and one spare light-emitting element 4 are provided within the sub-pixel unit 2, but it is not limited to this. In this setting method, the number of light-emitting elements within the sub-pixel unit 2 is small, and the number of sub-pixel units 2 arranged in an array in the display panel can be increased accordingly, thereby achieving a high PPI; in addition, within the same sub-pixel unit 2, the main light-emitting element 3 and the spare light-emitting element 4 are in a one-to-one correspondence. In this way, the difficulty of setting the switching circuit between the main light-emitting element 3 and the spare light-emitting element 4 is relatively low, which is beneficial to simplifying the manufacturing process of the display panel.

[0060] Optionally, Figure 4 is a schematic structural diagram of another display panel provided by the embodiments of the present invention. Refer to Figure 4 , in a possible embodiment, the spare light-emitting element 4 may include a first spare light-emitting element 5 and a second spare light-emitting element 6; the first spare light-emitting element 5 and the second spare light-emitting element 6 are respectively located in two adjacent sub-pixel units 2 along at least one direction; wherein, the difference between the peak wavelength of the first spare light-emitting element 5 and the standard peak wavelength is Δλ5, and the difference between the peak wavelength of the second spare light-emitting element 6 and the standard peak wavelength is Δλ6, and the signs of Δλ5 and Δλ6 are opposite.

[0061] Specifically, as Figure 4As shown, when a main light-emitting element 3 and a spare light-emitting element 4 are arranged in a sub-pixel unit 2, the spare light-emitting element 4 can be further divided into a first spare light-emitting element 5 and a second spare light-emitting element 6. Among them, along any extension direction of the display panel, the first spare light-emitting element 5 and the second spare light-emitting element 6 are respectively located in two adjacent sub-pixel units 2. It can also be understood that among two adjacent sub-pixel units 2 along any direction, a main light-emitting element 3 and a first spare light-emitting element 5 are arranged in one sub-pixel unit 2, and a main light-emitting element 3 and a second spare light-emitting element 6 are arranged in the other sub-pixel unit 2. Figure 4 In the figure, the first spare light-emitting element 5 is filled in a grid pattern, and the second spare light-emitting element 6 is filled in a slant pattern.

[0062] The difference between the first spare light-emitting element 5 and the second spare light-emitting element 6 lies in the relative magnitude relationship between their peak wavelengths and the standard peak wavelength. Let Δλ5 represent the difference between the peak wavelength of the first spare light-emitting element 5 and the standard peak wavelength, and Δλ6 represent the difference between the peak wavelength of the second spare light-emitting element 6 and the standard peak wavelength. In the embodiments of the present application, the signs of Δλ5 and Δλ6 can be set to be opposite. Simply put, the relative magnitude relationships between the peak wavelengths of the first spare light-emitting element 5 and the second spare light-emitting element 6 and the standard peak wavelength are different. If the peak wavelength of the first spare light-emitting element 5 is greater than the standard peak wavelength, that is, Δλ5 is greater than zero, then the peak wavelength of the second spare light-emitting element 6 is less than the standard peak wavelength, that is, Δλ6 is less than zero; conversely, when Δλ5 is less than zero, Δλ6 is greater than zero.

[0063] In the embodiments of the present application, by adopting the above division method and arrangement method for the first spare light-emitting element 5 and the second spare light-emitting element 6, it is possible to avoid large-area wavelength fluctuations in the same direction in the spare light-emitting element 4, and the offset situations of parameters such as the chromaticity of the light emitted by adjacent spare light-emitting elements 4 are neutralized to a certain extent, avoiding the chromaticity and brightness of the sub-pixel unit 2 from shifting according to the same trend, so that the light-emitting effects of each sub-pixel unit 2 tend to be consistent, and further improving the display uniformity of the display panel.

[0064] Among them, for the specific arrangement method of the first spare light-emitting element 5 and the second spare light-emitting element 6 in the display panel, the embodiments of the present invention do not make any limitations, and those skilled in the art can set it according to actual needs. Hereinafter, several embodiments will be used to introduce the optional arrangement methods of the spare light-emitting element 4.

[0065] Exemplarily, reference can be continued to Figure 4 , in a possible embodiment, the first spare light-emitting element 5 and the second spare light-emitting element 6 can be respectively located in two adjacent sub-pixel units 2 along the first direction X.

[0066] Specifically, as Figure 4As shown, a first spare light-emitting element 5 and a second spare light-emitting element 6 can be respectively arranged in two adjacent sub-pixel units 2 along the first direction X (the row direction shown in the figure). In this setting mode, the first spare light-emitting element 5 and the second spare light-emitting element 6 are alternately arranged in sequence along the first direction X. At the same time, the same spare light-emitting element 4 is arranged in each of the sub-pixel units 2 arranged along the second direction Y, for example, the first spare light-emitting element 5 (or the second spare light-emitting element 6) is arranged. In this way, the spare light-emitting elements 4 in the display panel are in a column inversion form, and the wavelength fluctuation directions of the spare light-emitting elements 4 arranged in the adjacent column directions are opposite.

[0067] Exemplarily, Figure 5 is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 5 , in other possible embodiments, the first spare light-emitting element 5 and the second spare light-emitting element 6 can be respectively located in two adjacent sub-pixel units 2 along the second direction Y.

[0068] Specifically, as Figure 5 shown, a first spare light-emitting element 5 and a second spare light-emitting element 6 can be respectively arranged in two adjacent sub-pixel units 2 along the second direction Y (the column direction shown in the figure). In this setting mode, the first spare light-emitting element 5 and the second spare light-emitting element 6 are alternately arranged in sequence along the second direction Y. At the same time, the same spare light-emitting element 4 is arranged in each of the sub-pixel units 2 arranged along the first direction X, for example, the first spare light-emitting element 5 (or the second spare light-emitting element 6) is arranged. In this way, the spare light-emitting elements 4 in the display panel are in a row inversion form, and the wavelength fluctuation directions of the spare light-emitting elements 4 arranged in the adjacent row directions are opposite. Figure 5 In

[0069] the row inversion or column inversion mode of the spare light-emitting element 4, the arrangement modes of the first spare light-emitting element 5 and the second spare light-emitting element 6 are relatively simple, which is beneficial to reducing the transfer difficulty of the spare light-emitting element 4 and improving the transfer efficiency of the spare light-emitting element 4.

[0070] Exemplarily, Figure 6 is a schematic structural diagram of still another display panel provided by an embodiment of the present invention. Refer to Figure 6 , in other possible embodiments, the first spare light-emitting element 5 and the second spare light-emitting element 6 can be respectively located in two adjacent sub-pixel units 2 along the first direction X and the second direction Y.

[0071] Specifically, as Figure 6As shown, a first spare light-emitting element 5 and a second spare light-emitting element 6 can be respectively arranged in two sub-pixel units 2 that are adjacent to each other along both the first direction X and the second direction Y (the row direction and the column direction shown in the figure). In this setting method, the first spare light-emitting element 5 and the second spare light-emitting element 6 are alternately arranged in sequence along both the first direction X and the second direction Y at the same time. In this way, the spare light-emitting elements 4 in the display panel are in a dot inversion form, and the wavelength fluctuation directions of the spare light-emitting elements 4 arranged in the adjacent row direction and column direction are opposite. In the dot inversion mode, the display uniformity effect of the display panel is better.

[0072] Of course, in other embodiments not shown, the spare light-emitting elements 4 can also be arranged in an n-column inversion, n-row inversion, or n-dot inversion form, where n is an integer greater than or equal to 2, but not limited thereto, and those skilled in the art can adjust according to actual needs. Among them, n-column inversion means that the wavelength fluctuation directions of every n columns of spare light-emitting elements 4 adjacent along the first direction X are opposite; n-row inversion means that the wavelength fluctuation directions of every n rows of spare light-emitting elements 4 adjacent along the second direction Y are opposite; n-dot inversion means that the wavelength fluctuation directions of every n spare light-emitting elements 4 adjacent along the first direction X and the second direction Y are opposite.

[0073] It should be noted that the same spare light-emitting elements 4 arranged in the sub-pixel unit 2 mentioned in the above embodiments do not refer to the spare light-emitting elements 4 with exactly the same peak wavelength, but to the spare light-emitting elements 4 with the same peak wavelength fluctuation direction.

[0074] Figure 7 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 7 , in a possible embodiment, within the same sub-pixel unit 2, the number of main light-emitting elements 3 can be less than the number of spare light-emitting elements 4.

[0075] Specifically, as Figure 7 shown, in this embodiment, within the same sub-pixel unit 2, the number of spare light-emitting elements 4 can be set for the number of main light-emitting elements 3. For example Figure 7 as shown in, each sub-pixel unit 2 includes one main light-emitting element 3 and two spare light-emitting elements 4, and the actual set number is not limited thereto. In this setting method, each main light-emitting element 3 corresponds to at least two spare light-emitting elements 4. When the main light-emitting element 3 emits light, one or two corresponding spare light-emitting elements 4 are enabled. Setting the number of spare light-emitting elements 4 to be more than the number of main light-emitting elements 3 can ensure that there are still normal spare light-emitting elements 4 to replace the main light-emitting element 3 to emit light if the main light-emitting element 3 and some of the spare light-emitting elements 4 in the same sub-pixel unit 2 fail.

[0076] Optionally, continue to refer to Figure 7, it is possible to set that a main light-emitting element 3, at least one first sub-spare light-emitting element 7, and at least one second sub-spare light-emitting element 8 are included in the same sub-pixel unit 2; wherein, the difference between the peak wavelength of the first sub-spare light-emitting element 7 and the standard peak wavelength is Δλ7, the difference between the peak wavelength of the second sub-spare light-emitting element 8 and the standard peak wavelength is Δλ8, and the signs of Δλ7 and Δλ8 are opposite.

[0077] Specifically, still taking the example that one main light-emitting element 3 and two spare light-emitting elements 4 are arranged in the same sub-pixel unit 2, in this embodiment, the spare light-emitting elements 4 in the same sub-pixel unit 2 can be further divided into a first sub-spare light-emitting element 7 and a second sub-spare light-emitting element 8. When the main light-emitting element 3 fails, both the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 are enabled, and the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 replace the main light-emitting element 3 to emit light. Figure 7 In the figure, the first sub-spare light-emitting element 7 is represented by horizontal line filling, and the second sub-spare light-emitting element 8 is represented by vertical line filling.

[0078] The division method of the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 is the relative magnitude relationship between their respective peak wavelengths and the standard peak wavelength. Let Δλ7 represent the difference between the peak wavelength of the first sub-spare light-emitting element 7 and the standard peak wavelength, and Δλ8 represent the difference between the peak wavelength of the second sub-spare light-emitting element 8 and the standard peak wavelength. In the embodiment of the present application, it is possible to set that the signs of Δλ7 and Δλ8 are opposite. Simply put, the relative magnitude relationships between the peak wavelengths of the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 and the standard peak wavelength are different. If the peak wavelength of the first sub-spare light-emitting element 7 is greater than the standard peak wavelength, that is, Δλ7 is greater than zero, then the peak wavelength of the second sub-spare light-emitting element 8 is less than the standard peak wavelength, that is, Δλ8 is less than zero; conversely, when Δλ7 is less than zero, Δλ8 is greater than zero.

[0079] Through the above setting method, within the same sub-pixel unit 2, the fluctuation directions of the peak wavelengths of the spare light-emitting elements 4 are opposite, and the offset situations of parameters such as the chromaticity of the light emitted by the spare light-emitting elements 4 are neutralized to a certain extent, thereby improving the light emission uniformity of the sub-pixel unit 2.

[0080] In addition, it should be noted that when both the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 are enabled, the combined light emission brightness of the two sub-spare light-emitting elements 4 may be greater than the light emission brightness of one main light-emitting element 3. Therefore, when both sub-spare light-emitting elements 4 in the sub-pixel unit 2 are enabled, the driving voltage of the sub-spare light-emitting elements 4 can be appropriately reduced to ensure that the light emission brightness of the two sub-spare light-emitting elements 4 in this pixel unit is closer to the light emission brightness of the main light-emitting element 3 in other pixel units, and to avoid affecting the display effect after the spare light-emitting elements 4 are enabled.

[0081] Optionally, in a possible embodiment, |Δλ7 + Δλ8| ≤ 3 nm may be set.

[0082] Specifically, in this embodiment, the difference Δλ7 between the peak wavelength of the first sub-spare light-emitting element 7 and the standard peak wavelength and the difference Δλ8 between the peak wavelength of the second sub-spare light-emitting element 8 and the standard peak wavelength may also satisfy the following relationship: |Δλ7 + Δλ8| ≤ 3 nm. As can be seen from the above optional embodiment, in order to ensure the uniform emission of the sub-pixel unit 2, the fluctuation amplitude of the main light-emitting element 3 may be set to be less than or equal to 3 nm. In this embodiment, when Δλ7 and Δλ8 satisfy the above relationship, the overall peak wavelength fluctuation amplitude of the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 is closer to the standard peak wavelength, and the emission uniformity when the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 work together is better.

[0083] Optionally, in an embodiment of the present invention, the peak wavelength fluctuation amplitude of the first sub-spare light-emitting element 7 may also be set to be the same as the peak wavelength fluctuation amplitude of the second sub-spare light-emitting element 8, that is, |Δλ7 + Δλ8| = 0. In this way, the overall average peak wavelength of the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 is close to the standard peak wavelength. The difference in the peak wavelengths of the first sub-spare light-emitting element 7 and the second sub-spare light-emitting element 8 in the display panel is small, which can ensure the overall emission uniformity when the spare light-emitting element 4 emits light.

[0084] Optionally, reference may continue to Figure 7 , in a possible embodiment, the area of the projection of the spare light-emitting element 4 on the array substrate 1 is less than or equal to the area of the projection of the main light-emitting element 3 on the array substrate 1.

[0085] Specifically, when the number of spare light-emitting elements 4 in the sub-pixel unit 2 is more than the number of main light-emitting elements 3, the size of the spare light-emitting element 4 may be set to be less than or equal to the size of the main light-emitting element 3, so as to avoid the spare light-emitting element 4 occupying a large space in the display panel, ensure the number of main light-emitting elements 3 that can be arranged in the display panel, and achieve a high PPI.

[0086] Among them, when multiple sub-spare light-emitting elements are arranged in the same sub-pixel unit 2, the arrangement manner of the sub-spare light-emitting elements may be set by those skilled in the art according to actual needs. Figure 7 Only an optional arrangement manner is exemplarily shown in

[0087] Optionally, Figure 8 is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 8, in a possible embodiment, the main light-emitting element 3 may include a first main light-emitting element 9 and a second main light-emitting element 10; the first main light-emitting element 9 and the second main light-emitting element 10 are respectively located in two adjacent sub-pixel units 2 along the first direction X and / or the second direction Y; the difference between the peak wavelength of the first main light-emitting element 9 and the standard peak wavelength is Δλ9, and the difference between the peak wavelength of the second main light-emitting element 10 and the standard peak wavelength is Δλ10, and the signs of Δλ9 and Δλ10 are opposite.

[0088] Specifically, in this embodiment, the main light-emitting element 3 may also be arranged in the same arrangement manner as the first standby light-emitting element 5 and the second standby light-emitting element 6 in the above embodiment. That is, along any extension direction of the display panel, the first main light-emitting element 9 and the second main light-emitting element 10 are respectively located in two adjacent sub-pixel units 2. Figure 8 In [description], the first main light-emitting element 9 is represented by dot filling, and the second main light-emitting element 10 is represented by square grid filling.

[0089] Similar to the division method of the first standby light-emitting element 5 and the second standby light-emitting element 6, the difference between the first main light-emitting element 9 and the second main light-emitting element 10 also lies in the relative magnitude relationship between their respective peak wavelengths and the standard peak wavelength. Let Δλ9 represent the difference between the peak wavelength of the first main light-emitting element 9 and the standard peak wavelength, and Δλ10 represent the difference between the peak wavelength of the second main light-emitting element 10 and the standard peak wavelength. It can be set that the signs of Δλ9 and Δλ10 are opposite. Simply put, the relative magnitude relationship between the peak wavelengths of the first main light-emitting element 9 and the second main light-emitting element 10 and the standard peak wavelength is different. If the peak wavelength of the first main light-emitting element 9 is greater than the standard peak wavelength, that is, Δλ9 is greater than zero, then the peak wavelength of the second main light-emitting element 10 is less than the standard peak wavelength, that is, Δλ10 is less than zero; conversely, when Δλ9 is less than zero, Δλ10 is greater than zero. In this way, it is possible to avoid large-area wavelength fluctuations in the same direction in the main light-emitting element 3, and the offset of parameters such as the chromaticity of the light emitted by adjacent main light-emitting elements 3 is neutralized to a certain extent, so that the light-emitting effects of the respective sub-pixel units 2 tend to be consistent, further ensuring the display uniformity of the display panel.

[0090] The specific arrangement manner of the first main light-emitting element 9 and the second main light-emitting element 10 in the display panel may refer to the arrangement manner of the first standby light-emitting element 5 and the second standby light-emitting element 6 in the above embodiment. For example Figure 8As shown, the first main light-emitting element 9 and the second main light-emitting element 10 can be respectively arranged in two adjacent sub-pixel units 2 along the first direction X (i.e., the main light-emitting element 3 is in a column inversion form); alternatively, the first main light-emitting element 9 and the second main light-emitting element 10 can be respectively arranged in two adjacent sub-pixel units 2 along the second direction Y (i.e., the main light-emitting element 3 is in a row inversion form); or, the first main light-emitting element 9 and the second main light-emitting element 10 can be respectively arranged in two adjacent sub-pixel units 2 along both the first direction X and the second direction Y (i.e., the main light-emitting element 3 is in a dot inversion form), but not limited thereto, and this embodiment will not be described in detail one by one.

[0091] Optionally, in this embodiment, the setting manner of the spare light-emitting element 4 in the sub-pixel unit 2 where the first main light-emitting element 9 and the second main light-emitting element 10 are located can refer to any of the above embodiments, and this embodiment will not elaborate on this. Exemplarily, the peak wavelength fluctuation directions of the spare light-emitting elements 4 corresponding to different main light-emitting elements 3 may not be divided, that is, the first main light-emitting element 9 and the second main light-emitting element 10 can correspond to the spare light-emitting elements 4 with any wavelength fluctuation direction; or, the first main light-emitting element 9 can be correspondingly provided with the first spare light-emitting element 5, and the second main light-emitting element 10 can be correspondingly provided with the second spare light-emitting element 6, but not limited thereto.

[0092] Figure 9 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention, and reference can be made in combination with Figure 1 and Figure 9 , in possible embodiments, both the main light-emitting element 3 and the spare light-emitting element 4 can be arranged in an array along the first direction X and the second direction Y; wherein, the main light-emitting element 3 and the spare light-emitting element 4 are alternately arranged in sequence along the first direction X, or the main light-emitting element 3 and the spare light-emitting element 4 are alternately arranged in sequence along the second direction Y.

[0093] Specifically, the arrangement manner of all the main light-emitting elements 3 in the display panel can be the same as the arrangement manner of the sub-pixel units 2, and the arrangement manner of all the spare light-emitting elements 4 can also be the same as the arrangement manner of the sub-pixel units 2. And the main light-emitting element 3 and the spare light-emitting element 4 can be alternately arranged along the first direction X or the second direction Y. As shown in Figure 1 , the main light-emitting element 3 and the spare light-emitting element 4 are alternately arranged along the second direction Y (alternately arranged in the column direction shown in the figure), that is, the spare light-emitting element 4 is interspersed between two rows of main light-emitting elements 3. In this setting manner, each sub-pixel unit 2 includes the main light-emitting element 3 and the spare light-emitting element 4 arranged along the second direction Y. Or as shown in Figure 9As shown, the main light-emitting elements 3 and the spare light-emitting elements 4 are arranged alternately along the first direction X (the row direction shown in the figure), that is, the spare light-emitting elements 4 are interspersed between two columns of main light-emitting elements 3. In this setting, each sub-pixel unit 2 includes a main light-emitting element 3 and a spare light-emitting element 4 arranged along the first direction X. In the above two arrangement methods, the arrangements of the main light-emitting elements 3 and the spare light-emitting elements 4 are relatively regular, which is beneficial to the transfer of the main light-emitting elements 3 and the spare light-emitting elements 4.

[0094] Of course, in actual applications, those skilled in the art can design the arrangement of the main light-emitting elements 3 and the spare light-emitting elements 4 according to actual needs. For example, it can be adjusted in combination with the layout of electrical devices and signal traces in the display panel.

[0095] Based on the same concept, the embodiment of the present invention also provides a method for manufacturing a display panel for manufacturing the display panel provided in any embodiment of the present invention. Figure 10 It is a flowchart of a method for manufacturing a display panel provided in an embodiment of the present invention. Refer to Figure 10 , the manufacturing method includes:

[0096] S110. Screen the light-emitting elements according to the peak wavelength.

[0097] Specifically, a standard peak wavelength can be set for the light-emitting elements to be transferred to the array substrate, and then the light-emitting elements are classified according to the relationship between the peak wavelength of the light-emitting element and the standard peak wavelength.

[0098] Among them, for the determination of the peak wavelength of the light-emitting element, any existing technology known to those skilled in the art can be used, and the present invention will not elaborate or limit this.

[0099] S120. Classify the light-emitting elements into main light-emitting elements and spare light-emitting elements according to the screening result of the peak wavelength.

[0100] Among them, the difference between the peak wavelength of the main light-emitting element 3 and the standard peak wavelength is within the first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element 4 and the standard peak wavelength is within the second wavelength difference range; at least part of the absolute value of the wavelength difference within the first wavelength difference range is less than the absolute value of the wavelength difference within the second wavelength difference range.

[0101] The absolute value of the wavelength difference represents the value by which the peak wavelength of the light-emitting element differs from the standard peak wavelength. The smaller the absolute value of the wavelength difference, the closer the peak wavelength of the light-emitting element is to the standard peak wavelength. It can also be understood that among the same batch of light-emitting elements to be transferred, compared with the spare light-emitting element 4, the peak wavelengths of at least part of the main light-emitting elements 3 are closer to the standard peak wavelength of the light-emitting element.

[0102] By adopting the hierarchical method proposed in this application, compared with the spare light-emitting element 4, the peak wavelength of the main light-emitting element 3 is closer to the standard peak wavelength, the overall fluctuation range of the peak wavelength of the main light-emitting element 3 is smaller, and the chromaticity and luminous brightness of the main light-emitting element 3 are better consistent, which is beneficial to improving the display uniformity of the display panel. In addition, using the light-emitting element with a larger peak wavelength fluctuation range as the spare light-emitting element 4 can also improve the utilization rate of the light-emitting element, reduce waste in the light-emitting element manufacturing process, and reduce the manufacturing cost of the light-emitting element.

[0103] S130. Transfer a plurality of main light-emitting elements to the array substrate.

[0104] The screened main light-emitting elements 3 can be transferred to the array substrate 1 by using micro-transfer printing technology. Among them, the arrangement mode of the main light-emitting elements 3 in the array substrate 1 can refer to any of the above embodiments, which will not be elaborated here.

[0105] S140. Transfer a plurality of spare light-emitting elements to the array substrate.

[0106] Then, the screened spare light-emitting elements 4 are transferred to the array substrate 1 by using micro-transfer printing technology. Among them, the arrangement mode of the spare light-emitting elements 4 in the array substrate 1 can refer to any of the above embodiments, which will not be elaborated here.

[0107] Optionally, the transfer method of the light-emitting element is not limited to micro-transfer printing technology, and any process known in the art can also be used to transfer the light-emitting element. The embodiments of the present invention will not elaborate or limit this.

[0108] The method for preparing a display panel provided by the embodiments of the present invention has all the technical features and corresponding beneficial effects of the display panel provided by the embodiments of the present invention, which will not be elaborated here.

[0109] The embodiments of the present invention also provide a display device. Figure 11 It is a schematic structural diagram of a display device provided by an embodiment of the present invention. As Figure 11 shown, the display device includes the display panel 100 provided by any embodiment of the present invention. Therefore, the display device provided by the embodiments of the present invention has the corresponding beneficial effects of the display panel provided by the embodiments of the present invention, which will not be elaborated here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and an in-vehicle display device, etc. The embodiments of the present invention do not limit this.

[0110] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here, and various obvious changes, re-adjustments, combinations with each other and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, comprising: an array substrate; a plurality of sub-pixel units located on the array substrate, the plurality of sub-pixel units being arranged in an array along a first direction and a second direction, the first direction and the second direction intersecting; a main light-emitting element and a spare light-emitting element are included in the sub-pixel unit, and the spare light-emitting element is used to emit light when the main light-emitting element fails; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; at least part of the absolute values of the wavelength differences within the first wavelength difference range are less than the absolute values of the wavelength differences within the second wavelength difference range.

2. The display panel according to claim 1, characterized in that, the first wavelength difference range is (-Δλ1, Δλ1), the second wavelength difference range is (-Δλ2, Δλ2), |Δλ1|≤3nm, |Δλ2|≥2nm.

3. The display panel according to claim 1, characterized in that, the absolute values of the wavelength differences within the first wavelength difference range are all less than the absolute values of the wavelength differences within the second wavelength difference range.

4. The display panel according to claim 1, characterized in that, the first wavelength difference range is (-Δλ3, Δλ3), the second wavelength difference range is (-Δλ4, Δλ4), |Δλ3|≤2nm, 2nm<|Δλ4|≤4nm.

5. The display panel according to claim 1, characterized in that, within the same sub-pixel unit, the number of the main light-emitting elements is the same as the number of the spare light-emitting elements.

6. The display panel according to claim 5, characterized in that, the spare light-emitting element includes a first spare light-emitting element and a second spare light-emitting element; the first spare light-emitting element and the second spare light-emitting element are respectively located in two adjacent sub-pixel units along at least one direction; wherein, the difference between the peak wavelength of the first spare light-emitting element and the standard peak wavelength is Δλ5, the difference between the peak wavelength of the second spare light-emitting element and the standard peak wavelength is Δλ6, and the signs of Δλ5 and Δλ6 are opposite.

7. The display panel according to claim 6, characterized in that, the first spare light-emitting element and the second spare light-emitting element are respectively located in two adjacent sub-pixel units along the first direction.

8. The display panel according to claim 6, characterized in that, the first spare light-emitting element and the second spare light-emitting element are respectively located in two adjacent sub-pixel units along the second direction.

9. The display panel according to claim 6, characterized in that, the first spare light-emitting element and the second spare light-emitting element are respectively located in two adjacent sub-pixel units along the first direction and the second direction.

10. The display panel according to claim 1, characterized in that, Within the same sub-pixel unit, the number of the main light-emitting elements is less than the number of the spare light-emitting elements.

11. The display panel according to claim 10, wherein, within the same sub-pixel unit, one main light-emitting element, at least one first sub-spare light-emitting element and at least one second sub-spare light-emitting element are included; wherein, the difference between the peak wavelength of the first sub-spare light-emitting element and the standard peak wavelength is Δλ7, the difference between the peak wavelength of the second sub-spare light-emitting element and the standard peak wavelength is Δλ8, and the signs of Δλ7 and Δλ8 are opposite.

12. The display panel according to claim 11, wherein, |Δλ7 + Δλ8| ≤ 3nm.

13. The display panel according to claim 10, wherein, the area of the projection of the spare light-emitting element on the array substrate is less than or equal to the area of the projection of the main light-emitting element on the array substrate.

14. The display panel according to claim 1, wherein, the main light-emitting element includes a first main light-emitting element and a second main light-emitting element; the first main light-emitting element and the second main light-emitting element are respectively located in two adjacent sub-pixel units along the first direction and / or the second direction; the difference between the peak wavelength of the first main light-emitting element and the standard peak wavelength is Δλ9, the difference between the peak wavelength of the second main light-emitting element and the standard peak wavelength is Δλ10, and the signs of Δλ9 and Δλ10 are opposite.

15. The display panel according to claim 1, wherein, both the main light-emitting element and the spare light-emitting element are arranged in an array along the first direction and the second direction; wherein, the main light-emitting element and the spare light-emitting element are alternately arranged in sequence along the first direction, or the main light-emitting element and the spare light-emitting element are alternately arranged in sequence along the second direction.

16. A method for manufacturing a display panel, used for manufacturing the display panel according to any one of claims 1 to 15, the manufacturing method comprises: screening the light-emitting elements according to the peak wavelength; classifying the light-emitting elements into main light-emitting elements and spare light-emitting elements according to the screening result of the peak wavelength; wherein, the difference between the peak wavelength of the main light-emitting element and the standard peak wavelength is within a first wavelength difference range, and the difference between the peak wavelength of the spare light-emitting element and the standard peak wavelength is within a second wavelength difference range; at least part of the absolute values of the wavelength differences within the first wavelength difference range are less than the wavelength differences within the second wavelength difference range; transferring a plurality of the main light-emitting elements onto the array substrate; transferring a plurality of the spare light-emitting elements onto the array substrate.

17. A display device, wherein, comprises: the display panel according to any one of claims 1 to 15.

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