Display panel, preparation method and display device

Abstract

The application provides a display panel and a preparation method and a display device, wherein the display panel comprises: a first substrate comprising a plurality of first sub-substrates, first splicing seams being present between adjacent first sub-substrates; a second substrate located on one side of the first substrate, the second substrate comprising a plurality of second sub-substrates, the first substrate and the second substrate having light emitting elements therebetween, second splicing seams being present between adjacent second sub-substrates, the first splicing seams and the second splicing seams not overlapping in the thickness direction of the display panel; and at least one light emitting element being present between the second splicing seam and the orthographic projection of the first substrate. The weakening of the splicing seam reduces the influence of light scattering on display, and greatly improves the visual effect, mechanical property and stability of the display panel as a whole.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel, its manufacturing method, and a display device. Background Technology

[0002] Light-emitting diode (LED) display technology uses LEDs directly as pixels. A color LED display uses red, green, and blue LEDs as its basic light-emitting elements, arranged in a dot matrix. An LED display typically consists of a display module, a control system, and a power supply system. The control system controls the LEDs to emit different colors of light, thus creating an image. The smaller the LED crystal particles, the smaller the pixel size of the display and the finer the display effect. In recent years, LED crystal particles have been increasingly widely used in micron-level displays.

[0003] However, currently, LED display screens include mini light-emitting diodes and micro semiconductor light-emitting diodes, namely mini-LED and micro-LED. Due to the limitations of LED chip mass transfer technology, it is not possible to directly achieve large-screen display. Therefore, splicing screen technology has emerged. Splicing screens are formed by splicing multiple display screens together to create a large display screen.

[0004] However, in the field of large-size displays, Micro-LED technology is still limited by existing technical solutions and processes, and there are still technical problems such as large seams and visual differences at the splicing points. Summary of the Invention

[0005] The problem solved by this invention is to provide a display panel and its manufacturing method that reduces the impact of light scattering at the splicing seams on the display, thereby greatly improving the overall visual effect, mechanical properties and stability of the display panel.

[0006] To address the aforementioned problems, the present invention provides a display panel comprising: a first substrate including a plurality of first sub-substrates, wherein a first splicing seam exists between adjacent first sub-substrates; a second substrate located on one side of the first substrate, including a plurality of second sub-substrates, wherein a light-emitting element is provided between the first substrate and the second substrate, wherein a second splicing seam exists between adjacent second sub-substrates, wherein the first splicing seam and the second splicing seam do not overlap along the thickness direction of the display panel; and wherein at least one light-emitting element is included between the orthographic projection of the first substrate and the first splicing seam of the second splicing seam.

[0007] Accordingly, the present invention also provides a method for manufacturing a display panel, comprising: providing a plurality of first sub-substrates, each first sub-substrate having a plurality of light-emitting elements; providing a plurality of second sub-substrates; splicing the plurality of first sub-substrates into a first substrate, wherein adjacent first sub-substrates have a first splicing seam; splicing the plurality of second sub-substrates into a second substrate, the second substrate covering the first substrate, wherein adjacent second sub-substrates have a second splicing seam, wherein the first splicing seam and the second splicing seam do not overlap along the thickness direction of the display panel; and wherein the second splicing seam includes at least one light-emitting element between the orthographic projection of the first substrate and the first splicing seam.

[0008] Accordingly, the present invention also provides a display device including the panel displayed by any of the above-described embodiments.

[0009] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0010] In the technical solution of the display panel of the present invention, a first substrate includes a plurality of first sub-substrates, and a first splicing seam exists between adjacent first sub-substrates; a second substrate is located on one side of the first substrate, the second substrate includes a plurality of second sub-substrates, a light-emitting element is located between the first substrate and the second substrate, and a second splicing seam exists between adjacent second sub-substrates; along the thickness direction of the display panel, the first splicing seam and the second splicing seam do not overlap, and at least one light-emitting element is included between the orthographic projection of the second splicing seam on the first substrate and the first splicing seam, by means of the non-overlapping of the first splicing seam and the offset arrangement between the first splicing seam and the second splicing seam. The design minimizes the impact of light scattering at the splicing seams on the display. Furthermore, the first splicing seam of the adjacent first sub-sub ... Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the display panel structure in the first embodiment of the present invention;

[0012] Figure 2 for Figure 1 Top view;

[0013] Figure 3 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0016] Figure 6 This is a schematic diagram of the display panel structure in the second embodiment of the present invention;

[0017] Figure 7 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0018] Figure 8 This is a schematic diagram of the display panel structure in the third embodiment of the present invention;

[0019] Figure 9 This is a schematic diagram of the display panel structure in the fourth embodiment of the present invention;

[0020] Figure 10 A flowchart illustrating the method for manufacturing a display panel according to an embodiment of the present invention;

[0021] Figure 11 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0022] Figure 12 This is a schematic diagram of the splicing between display panels provided in an embodiment of the present invention. Detailed Implementation

[0023] Currently, in the field of large-size displays, Micro-LED technology is limited by existing technical solutions and processes, and still faces technical problems such as large seams and visual differences at the splicing points.

[0024] The inventors further discovered that by non-overlapping the first and second splicing seams (i.e., by shifting the position of the first and second splicing seams), the impact of light scattering at the splicing seams on the display is weakened. Furthermore, the first splicing seam of adjacent first sub-sub-substrates is supported by the second sub-sub-substrates, and the second splicing seam of adjacent second sub-sub-substrates is supported by the first sub-sub-substrates. This makes the first and second splicing seams less susceptible to being pushed apart by external forces, resulting in better mechanical properties and stability for the display panel. Simultaneously, the projection of the second splicing seam onto the first substrate includes at least one light-emitting element between it and the first splicing seam. The first and second splicing seams fall between the gaps of the light-emitting elements, preventing interference with their emission and significantly improving the overall visual effect of the display panel.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] A display panel 400 includes a first substrate 100 and a second substrate 200, with the second substrate 200 located on one side of the first substrate 100. The first substrate 100 includes a plurality of first sub-substrates 101, with a first seam between adjacent first sub-substrates 101. The second substrate 200 includes a plurality of second sub-substrates 201, with a light-emitting element 300 between the first substrate 100 and the second substrate 200. A first seam 102 exists between adjacent first sub-substrates 101, and a second seam 202 exists between adjacent second sub-substrates 201. Along the thickness direction of the display panel 400, the first seam 102 and the second seam 202 do not overlap. The second seam 202 includes at least one light-emitting element 300 between the orthographic projection of the first substrate 100 and the first seam 102. The first seam 202 is defined as the first seam 102 not overlapping with the second seam 202. The offset arrangement between 102 and the second splicing seam 202 weakens the impact of light scattering at the splicing seams (first splicing seam and second splicing seam) on the display. Furthermore, the first splicing seam 102 adjacent to the first sub-substrate 101 is supported by the second sub-substrate 201, and the second splicing seam 202 adjacent to the second sub-substrate 201 is supported by the first sub-substrate 101. As a result, the first splicing seam 102 and the second splicing seam 202 are not easily pushed apart by external forces, giving the display panel 400 better mechanical properties and stability. At the same time, the orthographic projection of the second splicing seam 202 on the first substrate 100 and the first splicing seam 102 include at least one light-emitting element 300. The first splicing seam 102 and the second splicing seam 202 fall between the gaps of the light-emitting elements 300, which will not interfere with the light emission of the light-emitting elements 300, greatly improving the overall visual effect of the display panel 400.

[0027] First Embodiment

[0028] In this embodiment, please refer to Figure 1 and Figure 2 The display panel 400 includes a first substrate 100 and a second substrate 200 located on one side of the first substrate 100. The first substrate 100 includes a plurality of first sub-substrates 101. A first splicing seam 102 exists between adjacent first sub-substrates 101. A plurality of light-emitting elements 300 are provided on the first sub-substrates 101. The second substrate 200 includes a plurality of second sub-substrates 201. A second splicing seam 202 exists between adjacent second sub-substrates 201. The first splicing seam 102 and the second splicing seam 202 do not overlap along the thickness direction of the display panel 400. The second splicing seam 202 includes at least one light-emitting unit 301 between the orthographic projection of the first substrate 100 and the first splicing seam 102. The light-emitting unit 301 includes at least two light-emitting elements 300 of different colors.

[0029] Figure 1 for Figure 2 Exploded view of the cross-section at point AA Figure 2 for Figure 1 The top view, where the thickness direction along the display panel 400 is set as the Y direction.

[0030] In some embodiments, the light-emitting element 300 may also be located on the second sub-substrate 201.

[0031] In this embodiment, the first sub-substrate 101 includes a glass substrate 101a, and a TFT layer 101b of TFT (thin film transistor) circuit, a TFT circuit 101c of the TFT layer, and a side wiring 101d are included on the entire surface of the glass substrate 101a facing the second sub-substrate 201. The side wiring 101d is used to electrically connect the circuit disposed on the rear surface.

[0032] In this embodiment, the light-emitting element 300 includes multiple LEDs arranged in an array, which can emit red light, green light, or blue light, etc., and the light-emitting unit 301 includes at least two light-emitting elements 300 of different colors.

[0033] In this embodiment, the surface of the second sub-substrate 201 facing the first sub-substrate 101 has a plurality of color resists 201a, and the color resists 201a correspond one-to-one with the light-emitting elements 300.

[0034] Specifically, color resist 201a generally obtains the three primary colors of red, green, and blue by using pigments or dyes as colorants.

[0035] The method for forming the second substrate 200 includes: providing a transparent substrate 201b, forming a second light-shielding layer 201c on the transparent substrate, distributing and coating red, green and blue filter materials on the second light-shielding layer 201b, and forming a plurality of color resists 201a through exposure, development and etching processes.

[0036] After forming the color resists, an ITO layer (not shown in the figure) is formed to ensure that current can pass through each color resist; and a protective layer (not shown in the figure) is formed on the ITO layer to protect the entire CF layer from damage.

[0037] In this embodiment, the first substrate 100 and the second substrate 200 are fixedly bonded together by a connector (not shown in the figure). Specifically, the connector is optically clear adhesive (OCA), which has advantages such as high light transmittance and high adhesion.

[0038] Of course, the connectors can also be made of other materials, as long as they have sufficient light transmittance and adhesion to meet the actual requirements. There are no restrictions here.

[0039] In this embodiment, the first sub-substrate 101 and the second sub-substrate 201 have the same shape. Specifically, the first sub-substrate 101 has two parallel and congruent first bottom surfaces and a plurality of first side surfaces formed by parallelograms; the second sub-substrate 201 has two parallel and congruent second bottom surfaces and a plurality of second side surfaces formed by parallelograms, for example, the first bottom surface and the second bottom surface are rectangular.

[0040] In some embodiments, the first and second bottom surfaces may also be square, triangular, or rhomboid, etc.

[0041] Figure 1 The first sub-substrate 101 adjacent to the first splicing seam 102 is separate, and the second sub-substrate 201 adjacent to the second splicing seam 202 is separate.

[0042] In this embodiment, three light-emitting elements 300 are included between the first splicing seam 102 and the second splicing seam 202 projected onto the first substrate 100. This achieves a shifted arrangement between the first splicing seam 102 and the second splicing seam 202, weakening the impact of light scattering at the splicing seam on the display. Moreover, the first splicing seam 102 and the second splicing seam 202 fall between the gaps of the light-emitting elements 300, without interfering with the light emission of the light-emitting elements 300, greatly improving the overall visual effect of the display panel 400. At the same time, the bottom of the first splicing seam 102 is a single piece of the second sub-substrate 201. Thus, when the first splicing seam 102 is subjected to external force, the second sub-substrate 201 provides support. Similarly, the bottom of the second splicing seam 202 is a single piece of the first sub-substrate 101. Thus, when the second splicing seam 202 is subjected to external force, the first sub-substrate 101 also provides support. Therefore, the first splicing seam 102 and the second splicing seam 202 are not easily pushed apart by external forces, giving the display panel 400 better mechanical properties and stability.

[0043] In this embodiment, please refer to Figure 1 The first sub-substrate 101 has a first light-shielding layer 101e on its surface facing the second sub-substrate 201, and the second splicing seam 202 overlaps with the first light-shielding layer 101e along the thickness direction of the display panel 400.

[0044] In this embodiment, the first light-shielding layer 101e is used to achieve optical compensation at the second splicing seam 202, thus realizing seamless display.

[0045] Please continue to refer to this. Figure 1 The second sub-substrate 201 has a second light-shielding layer 201c on its surface facing the first sub-substrate 101. Along the thickness direction of the display panel 400, the first splicing seam 102 overlaps with the second light-shielding layer 201c.

[0046] In this embodiment, the second light-shielding layer 201c is used to achieve optical compensation at the first splicing seam 102, thus realizing seamless display.

[0047] In this embodiment, a second light-shielding layer 201c is also provided between adjacent color resists 201a.

[0048] In some embodiments, please refer to Figure 3 The second splicing seam 202 includes at least one light-emitting unit 301 between its orthographic projection on the first substrate 100 and the first splicing seam 102. The light-emitting unit 301 includes two light-emitting elements 300 of different colors.

[0049] In some embodiments, please refer to Figure 4 The second splicing seam 202 includes a light-emitting element 300 between its orthographic projection on the first substrate 100 and the first splicing seam 102.

[0050] In this embodiment, please continue to refer to Figure 1 The dimension (L1) of the first sub-substrate 101 in the direction perpendicular to the thickness of the display panel 400 and perpendicular to the extension direction of the first splicing seam 102 is smaller than the dimension (L2) of the second sub-substrate 201 in the direction perpendicular to the thickness of the display panel 400 and perpendicular to the extension direction of the first splicing seam 102. This helps to facilitate subsequent electrical connections and ensures the integrity and stability of the circuit.

[0051] In some embodiments, please refer to Figure 5 The dimension (L1) of the first sub-substrate 101 in the direction perpendicular to the thickness of the display panel 400 and perpendicular to the extension direction of the first splicing seam 102 is greater than the dimension (L2) of the second sub-substrate 201 in the direction perpendicular to the thickness of the display panel 400 and perpendicular to the extension direction of the first splicing seam 102.

[0052] Accordingly, please refer to Figure 10 The present invention also provides a method for manufacturing a display panel 400, comprising: S1: providing a plurality of first sub-substrates 101, each first sub-substrate 101 having a plurality of light-emitting elements 300, splicing the plurality of first sub-substrates 101 to form a first substrate 100, wherein adjacent first sub-substrates 101 have a first splicing seam 102; S2: providing a plurality of second sub-substrates 201, splicing the plurality of second sub-substrates 201 to form a second substrate 200, wherein adjacent second sub-substrates 201 have a second splicing seam 202; S3: the second substrate 200 covers the first substrate 100, and along the thickness direction of the display panel 400, the first splicing seam 102 and the second splicing seam 202 do not overlap, and the second splicing seam 202 includes at least one light-emitting element 300 between the orthographic projection of the first substrate 100 and the first splicing seam 102.

[0053] Second Embodiment

[0054] The difference between this embodiment and the first embodiment is that it also includes an auxiliary support column 302 and a main support column 303.

[0055] In this embodiment, please refer to Figure 6 It also includes an auxiliary support column 302 located between the first substrate 100 and the second substrate 200, and there is a gap between the bottom surface of the auxiliary support column 302 and the surface of the first sub-substrate 101.

[0056] In this embodiment, the auxiliary support column 302 is formed on the second sub-substrate 201. The bottom surface of the auxiliary support column 302 has a gap with the surface of the first sub-substrate 101. The advantage of this design is that when the first splice seam 102 is squeezed, the gap can provide a buffer space, avoiding the risk of the first splice seam 102 breaking or cracking during the process of being subjected to external force. At the same time, when subjected to pressure, the auxiliary support column 302 can play a supporting role, avoiding the problem of the first splice seam 102 breaking.

[0057] In this embodiment, the auxiliary support column 302 overlaps with the first splicing seam 102. Specifically, along the thickness direction of the display panel 400 and parallel to the extension direction of the first splicing seam 102, the auxiliary support column 302 covers the first splicing seam 102, effectively preventing uneven force on the first splicing seam 102 from causing abnormalities in the display panel 400 and abnormal pressing of the first splicing seam 102, thereby ensuring the quality of the display panel 400.

[0058] In this embodiment, please continue to refer to Figure 6 It also includes a main support column 303 located between the first substrate 100 and the second substrate 200, the height of which is greater than the height of the auxiliary support column 302.

[0059] In this embodiment, the main support column 303 is located at the non-jointing part.

[0060] In some embodiments, the main support column 303 is also located at the splice.

[0061] In this embodiment, the main support column 303 can support the first substrate 100 and the second substrate 200, preventing damage to the first substrate 100 and the second substrate 200 during long-term use, thereby ensuring the flatness and stability of the display panel 400. In addition, the main support column 303 is evenly distributed between the first substrate 100 and the second substrate 200, which can improve the thickness uniformity of the display panel 400 and reduce display quality problems caused by uneven thickness. At the same time, the main support column 303 not only supports the first substrate 100 and the second substrate 200, but also prevents liquid crystal from leaking inside the display panel 400, ensuring the long-term stable operation of the display panel 400.

[0062] In this embodiment, the main support column 303 first bears the pressure and plays a supporting role. When the pressure increases further, the gap between the auxiliary support column 302 and the first substrate 100 becomes smaller under pressure, thereby making the auxiliary support column 302 contact the first substrate 100 and thus providing auxiliary support.

[0063] In this embodiment, both the main support pillar 303 and the auxiliary support pillar 302 are located on the second sub-substrate 201 and can be fabricated using a masking process.

[0064] In some embodiments, please refer to Figure 7 Along the thickness direction of the display panel 400, there are auxiliary support columns 302 on both sides of the first splicing seam 102.

[0065] In this embodiment, along the thickness direction of the display panel 400, the auxiliary support columns 302 are symmetrically distributed on both sides of the first splicing seam 102 to ensure that the first splicing seam 102 is uniformly stressed.

[0066] In some embodiments, the main support column 303 overlaps with the first splicing seam 102. Specifically, along the thickness direction of the display panel 400 and parallel to the extension direction of the first splicing seam 102, the main support covers the first splicing seam 102, or along the thickness direction of the display panel 400, the first splicing seam 102 has main support columns 303 on both sides.

[0067] Third Embodiment

[0068] The only difference between this embodiment and the first embodiment is that the second sub-substrate 201 is different.

[0069] In this embodiment, please refer to Figure 8 The second sub-substrate 201 has a plurality of quantum dot film layers 203 on its surface facing the first sub-substrate 101, and the plurality of quantum dot film layers 203 correspond one-to-one with the light-emitting element 300.

[0070] In this embodiment, the method for forming the second substrate 200 includes: cleaning and drying a glass substrate or PET film; uniformly depositing phenelzine on the substrate surface using vacuum vapor deposition, with a deposition thickness of approximately 2 to 100 μm; sequentially coating quantum dots onto the substrate and then curing them according to the quantum dot array arrangement requirements; depositing the phenelzine film layer again using vacuum vapor deposition; and peeling the quantum dot film layer 203 off the glass substrate or PET film to obtain the finished quantum dot film layer 203.

[0071] Fourth embodiment

[0072] The only difference between this embodiment and the first embodiment is that the second sub-substrate 201 is different.

[0073] In this embodiment, please refer to Figure 9 The second sub-substrate 201 has a plurality of lenses 204 on its surface facing the first sub-substrate 101, and each lens 204 corresponds to a light-emitting element 300.

[0074] Accordingly, please refer to Figure 11 The present invention also provides a display device 500, including... Figures 1 to 9 Any of the display panels 400 shown. The specific structure and principle of the display panel 400 are the same as in the above embodiments, and will not be repeated here. The display device can be any electronic device with display function, such as a touch screen, mobile phone, tablet computer, laptop computer, e-reader, or television.

[0075] Accordingly, please refer to Figure 12 Multiple display panels 400 are spliced ​​together to form a display panel of the required specifications.

[0076] Figure 12 Only the splicing between two display panels 400 is shown.

[0077] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A display panel, characterized in that, include: The first substrate includes a plurality of first sub-substrates, and there is a first splicing seam between adjacent first sub-substrates; The second substrate located on one side of the first substrate includes a plurality of second sub-substrates. A light-emitting element is provided between the first substrate and the second substrate. A second splicing seam exists between adjacent second sub-substrates. Along the thickness direction of the display panel, the first splicing seam and the second splicing seam do not overlap. The second splicing seam includes at least one of the light-emitting elements between the orthographic projection of the first substrate and the first splicing seam; An auxiliary support column is located between the first substrate and the second substrate. The bottom surface of the auxiliary support column has a gap with the surface of the first sub-substrate, and the auxiliary support column overlaps with the first splicing seam. A main support column is located between the first substrate and the second substrate, and the height of the main support column is greater than the height of the auxiliary support column.

2. The display panel as described in claim 1, characterized in that, The first sub-substrate has a first light-shielding layer on its surface facing the second sub-substrate, and the second splicing seam overlaps with the first light-shielding layer along the thickness direction of the display panel.

3. The display panel as described in claim 1, characterized in that, The second sub-substrate has a second light-shielding layer on its surface facing the first sub-substrate, and the first splicing seam overlaps with the second light-shielding layer along the thickness direction of the display panel.

4. The display panel as described in claim 1, characterized in that, The second splicing seam, when projected onto the first substrate, includes at least one light-emitting unit between itself and the first splicing seam. The light-emitting unit includes at least two light-emitting elements of different colors.

5. The display panel as described in claim 1, characterized in that, The dimension of the first sub-substrate in the direction perpendicular to the thickness of the display panel and perpendicular to the extension direction of the first splicing seam is greater than the dimension of the second sub-substrate in the direction perpendicular to the thickness of the display panel and perpendicular to the extension direction of the first splicing seam.

6. The display panel as described in claim 1, characterized in that, The dimension of the first sub-substrate in the direction perpendicular to the thickness of the display panel and perpendicular to the extension direction of the first splicing seam is smaller than the dimension of the second sub-substrate in the direction perpendicular to the thickness of the display panel and perpendicular to the extension direction of the first splicing seam.

7. The display panel as described in claim 1, characterized in that, The auxiliary support covers the first splicing seam along a direction perpendicular to the thickness of the display panel and parallel to the extension direction of the first splicing seam.

8. The display panel as described in claim 1, characterized in that, Along the thickness direction of the display panel, the auxiliary support columns are located on both sides of the first splicing seam.

9. The display panel as claimed in claim 1, characterized in that, The main support column overlaps with the first splice seam.

10. The display panel as claimed in claim 1, characterized in that, The main support covers the first splicing seam along a direction perpendicular to the thickness of the display panel and parallel to the extension direction of the first splicing seam.

11. The display panel as claimed in claim 1, characterized in that, Along the thickness direction of the display panel, the main support columns are located on both sides of the first splicing seam.

12. The display panel as claimed in claim 1, characterized in that, The second sub-substrate has a plurality of color resists on its surface facing the first sub-substrate, and the color resists correspond one-to-one with the light-emitting elements.

13. The display panel as claimed in claim 1, characterized in that, The second sub-substrate has a plurality of quantum dot films on its surface facing the first sub-substrate, and each of the quantum dot films corresponds to a light-emitting element.

14. The display panel as claimed in claim 1, characterized in that, The second sub-substrate has a plurality of lenses facing the surface of the first sub-substrate, and each lens corresponds to a light-emitting element.

15. A method for manufacturing a display panel according to any one of claims 1 to 14, characterized in that, include: A plurality of first sub-sub ... A plurality of second sub-sub ... The second substrate covers the first substrate, and the first splicing seam and the second splicing seam do not overlap along the thickness direction of the display panel; the second splicing seam includes at least one of the light-emitting elements between the orthographic projection of the first substrate and the first splicing seam.

16. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 14.

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