Display panel and display device

Abstract

Provided in the embodiments of the present application is a display panel. The display panel comprises a display substrate (10) and a laminated cover plate (13). The display substrate (10) comprises a functional hole (H), an active area (AA), and a transition area (TA) located between the functional hole (H) and the active area (AA); and at least one laminate of the laminated cover plate (13) is provided with a functional hole light-transmitting part (1321) corresponding to the functional hole (H), a display light-transmitting part (1322) corresponding to the active area (AA), and a first shielding part (1323) corresponding to the transition area (TA), the first shielding part (1323) being located between the functional hole light-transmitting part (1321) and the display light-transmitting part (1322). The surface of the first shielding part (1323) away from the display substrate, the surface of the functional hole light-transmitting part (1321) away from the display substrate, and the surface of the display light-transmitting part (1322) away from the display substrate are located in the same plane.

Description

Display panel and display device

[0001] The present application claims priority to the Chinese patent application No. 202410634924.0, filed on May 21, 2024, and entitled "Display panel and display device", the contents of which should be understood as incorporated by reference into the present application. TECHNICAL FIELD

[0002] Embodiments of the present application relate to, but are not limited to, the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0003] The existing mobile phones, tablets and other terminals will set functional holes such as camera holes for functional components such as cameras. The performance requirements of the current terminals for various functional components are getting higher and higher, so there are higher requirements for the flatness of the cover surface. The peak-to-valley (PV) value is a parameter that can accurately evaluate the flatness of the functional hole area corresponding to the cover. The current terminal requires that the PV value be ≤0.8λ.

[0004] For a cover plate using ultra-thin flexible glass (UTG), a protective layer such as a colorless transparent polyimide film (CPI) or a polyethylene terephthalate film (PET) is usually adhered. In order to prevent light from leaking into the functional hole, an ink layer is usually provided on the protective layer and the area corresponding to the surrounding of the functional hole. However, due to the low modulus of CPI / PET, only 4Gpa, the step difference and panel pressure generated by the ink layer during the bonding process of UTG and the protective layer are easy to cause the surface of the protective layer to deform, thereby causing the PV value to increase and affecting the performance of the functional component. SUMMARY

[0005] The following is a summary of the subject matter described in detail herein, which is not intended to limit the scope of protection of the claims.

[0006] In one aspect, the present application provides a display panel, comprising:

[0007] a display substrate comprising a functional hole, a display area and a transition area; the transition area is located between the functional hole and the display area;

[0008] a laminated cover plate, at least one layer of the laminated cover plate is provided with a functional hole light transmission part corresponding to the functional hole, a display light transmission part corresponding to the display area, and a first shielding part corresponding to the transition area, the first shielding part is located between the functional hole light transmission part and the display light transmission part, wherein one side of the first shielding part away from the display substrate, one side of the functional hole light transmission part away from the display substrate, and one side of the display light transmission part away from the display substrate are located in the same plane.

[0009] In another aspect, the embodiments of the present application also provide a display device, which comprises the display panel according to any one of the above.

[0010] Other aspects can become apparent from the following description, which is given by way of example only.

[0011] SUMMARY

[0012] The present disclosure will become more apparent from the following description, which is given by way of example only with reference to the accompanying drawings. It is readily apparent to the person skilled in the art that these drawings are merely intended to illustrate the application and are not intended to restrict the scope of protection of the application. Furthermore, the same reference numerals are used in different figures to denote similar components.

[0013] Fig. 1 is a schematic structural diagram of a display panel;

[0014] Fig. 2 is a schematic structural diagram of another display panel;

[0015] Fig. 3 is a schematic diagram of the formation of crystal nucleus in photosensitive glass under light;

[0016] Fig. 4 is a schematic diagram of heat treatment crystallization;

[0017] Fig. 5 is a schematic diagram of experimental results of the transmittance of the blackened portion and the transmittance of the transparent portion in Fig. 4;

[0018] Fig. 6 is a schematic structural diagram of still another display panel;

[0019] Fig. 7 is a schematic structural diagram of yet another display panel;

[0020] Fig. 8 is a schematic structural diagram of still yet another display panel;

[0021] Fig. 9 is a schematic structural diagram of still yet another display panel;

[0022] Fig. 10 is a schematic structural diagram of a prior display panel;

[0023] Fig. 11 is a schematic diagram for comparing the improvement effect of the first adhesive layer thinning on the mold printing;

[0024] DETAILED DESCRIPTION

[0025] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways beyond the specific embodiments described and claimed herein. It is therefore intended that the present application not be limited in scope to the specific embodiments disclosed but rather that the scope of the present application be measured by the broadest permissible interpretation of the claims that follow.

[0026] In the description of the present application, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, in the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", and the like should be broadly understood, for example, it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Various structural diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clear expression, and certain details can be omitted. The shapes of various regions, layers shown in the drawings, and their relative size, positional relationship may only be exemplary, and in actuality, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can additionally design regions / layers with different shapes, sizes, relative positions according to actual needs.

[0028] In the context of the present disclosure, when a layer / element is referred to as being located "on" another layer / element, the layer / element can be directly located on the other layer / element, or there can be an intermediate layer / element between them. In addition, if a layer / element is located "on" another layer / element in one orientation, it can be located "under" the other layer / element when the orientation is reversed. In the context of the present disclosure, similar or identical components can be indicated by the same or similar reference numerals.

[0029] For the cover plate using ultra-thin flexible glass (UTG), a protective layer such as colorless transparent polyimide film (CPI) or polyethylene terephthalate film (PET) is usually adhered. In order to prevent light from leaking into the functional hole in the display substrate, an ink layer is usually provided on the protective layer and the area corresponding to the periphery of the functional hole, however, due to the low modulus of CPI / PET, only 4Gpa, the step difference and panel pressure generated by the ink layer during the bonding of UTG and protective layer are large, which is easy to cause the surface of the protective layer to deform, thereby causing the PV value to become larger, affecting the performance of the functional components.

[0030] FIG. 1 is a structural schematic diagram of a display panel. As shown in FIG. 1, the display panel can include a display substrate 10, a polarizer 11, a cover plate 13, and an adhesive layer (hereinafter referred to as a first adhesive layer 12) between the cover plate 13 and the display substrate 10. Among them, the display substrate 10 includes a functional hole H, a display area AA, and a transition area TA. The cover plate 13 includes a protective layer 131, a cover plate substrate layer 132, an ink layer 133, and an adhesive layer (hereinafter referred to as a second adhesive layer 134) between the protective layer 131 and the cover plate substrate layer 132. Among them, the protective layer 131 can be CPI / PET, the cover plate substrate layer 132 can be UTG, and the first adhesive layer 12 and the second adhesive layer 134 can both be OCA optical adhesive.

[0031] As shown in FIG. 1, the ink layer 133 is arranged below the protective layer 131 to form an ink difference. When the protective layer 131 is attached to the cover plate substrate layer 132 through the second adhesive layer 134, the protective layer 131 is easily deformed due to its small modulus. The deformed area is denoted as C. The greater the deformation, the greater the PV value of the area of the cover plate 13 covering the functional hole H (i.e., the deformed area C), which affects the performance of the functional components.

[0032] Therefore, in order to solve the above technical problems, the present application provides the following technical solutions:

[0033] In one exemplary embodiment, the display panel can include a display substrate 10 and a laminated cover plate 13. Among them, the display substrate 10 includes a functional hole H, a display area AA, and a transition area TA; the transition area TA is located between the functional hole H and the display area AA. Among them, the functional hole H can be a camera hole, and the transition area TA is a non-pixel area. The display substrate 10 and the laminated cover plate 13 can be bonded by the first adhesive layer 12.

[0034] At least one of the laminated cover plates 13 is provided with a functional hole light transmission part 1321 corresponding to the functional hole H, a display light transmission part 1322 corresponding to the display area AA, and a first shielding part 1323 corresponding to the transition area TA, the first shielding part 1323 being located between the functional hole light transmission part 1321 and the display light transmission part 1322. Wherein, the side of the first shielding part 1323 away from the display substrate 10, the side of the functional hole light transmission part 1321 away from the display substrate 10, and the side of the display light transmission part 1322 away from the display substrate 10 are located in the same plane. That is, in at least one of the laminated cover plates 13, the first shielding part 1323 and the functional hole light transmission part 1321 are provided at the same time, and the first shielding part 1323 and the functional hole light transmission part 1321 are ensured to be located in the same plane away from the display substrate 10. In this way, the first shielding part 1323 and the functional hole light transmission part 1321 are located in the same plane away from the display substrate 10, so that the existence of the functional hole light transmission part 1321 between the first shielding part 1323 makes the laminated cover plate 13 above the laminated cover plate 13 not have a gap, and by analogy, the gap in the area covering the functional hole H of the top laminated cover plate 13 of the laminated cover plate 13 can be eliminated. In this way, when the laminated cover plate 13 is prepared, the area of the surface of the laminated cover plate 13 covering the functional hole H has a small probability of deformation, and even if deformation occurs, the PV value is relatively small, and the performance impact on the functional components is small.

[0035] Exemplarily, FIG. 2 is a structural schematic diagram of another display panel. As shown in FIG. 2, the laminated cover plate 13 includes a protective layer 131, a cover plate substrate layer 132, and an adhesive layer (i.e., the second adhesive layer 134 mentioned above) located between the protective layer 131 and the cover plate substrate layer 132, wherein the thickness of the cover plate substrate layer 132 is 30-150 um, the modulus of the cover plate substrate layer 132 is greater than or equal to 80 Gpa, which can be UTG, the modulus of the protective layer 131 is less than or equal to 4 Gpa, which can be CPI or PET. In this embodiment, the first shielding part 1323 is provided on the cover plate substrate layer 132.

[0036] As shown in FIG. 2, the protective layer 131 is located on the side of the display substrate 10; the second adhesive layer 134 is located on the side of the protective layer 131 close to the display substrate 10; the cover substrate layer 132 is located between the second adhesive layer 134 and the display substrate 10, and is bonded to the protective layer 131 through the second adhesive layer 134; wherein the cover substrate layer 132 is provided with the functional hole light-transmitting part 1321, the display light-transmitting part 1322, and the first shielding part 1323; the functional hole light-transmitting part 1321, the display light-transmitting part 1322, and the first shielding part 1323 are integrally formed. That is, the region of the cover substrate layer 132 corresponding to the transition area TA of the display substrate 10 is made into the first shielding part 1323, and the functional hole light-transmitting part 1321 surrounded by the first shielding part 1323 and the first shielding part 1323 itself are connected together, and for the protective layer 131, there are both the first shielding part 1323 and the functional hole light-transmitting part 1321 below the protective layer 131, the protective layer 131 does not have a gap in the region covering the functional hole H of the display substrate 10, and when the protective layer 131 is attached to the cover substrate layer 132 later, the protective layer 131 is not easy to deform in the region covering the functional hole H of the display substrate 10, and finally the PV value is very small, which does not affect the performance of the functional components.

[0037] As shown in FIG. 2, the first shielding part 1323 is projected to the display substrate 10, and at least part of the projection overlaps the functional hole H of the display substrate 10, which means that the first shielding part 1323 is projected to the display substrate 10, and part of the projection overlaps the functional hole H of the display substrate 10, or does not overlap the functional hole H; and at least part of the projection of the first shielding part 1323 overlaps the transition area TA around the functional hole H of the display substrate 10. That is, the projection of the first shielding part 1323 can all overlap the transition area TA and does not overlap the functional hole H, or part of the projection overlaps the transition area TA and the other part overlaps the functional hole H. The projection of the first shielding part 1323 overlaps the functional hole H, and the shielding part can prevent light from passing through the functional hole H. The length of the projection of the first shielding part 1323 overlapping the functional hole H of the display substrate 10 can be at least 50 μm.

[0038] In an exemplary embodiment, the first shielding part 1323 can be formed on the cover substrate layer 132 in the following manner:

[0039] Exemplarily, the cover substrate layer 132 is a photosensitive substrate layer prepared from a photosensitive material; the first shielding part 1323 is obtained by irradiating the photosensitive substrate layer to crystallize the required region.

[0040] Exemplarily, the cover substrate layer 132 can use photosensitive glass. The area where the first shielding part 1323 needs to be made is exposed, crystallized and heat treated to make the exposed area appear black crystals. The crystals can effectively prevent light from passing through, achieve the purpose of making the first shielding part 1323 in the cover substrate layer 132, and replace the printed ink layer 133. There is no gap between the cover substrate layer 132 and the protective layer 131. When the cover substrate layer 132 is attached, the area of the functional hole H covered by the protective layer 131 can be avoided from being deformed.

[0041] In an exemplary embodiment, the exposure-crystallization-heat treatment process is as follows:

[0042] Step 1: Cover the photosensitive glass with a mask to expose the exposure area.

[0043] Step 2: Use a predetermined wavelength (in this scheme, λ = 380 nm) to irradiate the photosensitive glass to generate crystal nuclei in the photosensitive glass. Steps 1 and 2 can be seen in FIG. 3. FIG. 3 is a schematic diagram of the photosensitive glass generating crystal nuclei under light irradiation.

[0044] Step 3: Heat treat the photosensitive glass after light treatment (heat treatment temperature ≥ 700°C, heat treatment time is 48H). The crystal nuclei absorb energy to grow crystals during the heat treatment process, forming crystalline grains. In this embodiment, the crystalline grains are black, thereby achieving the effect of not transmitting light in the local area. See FIG. 4, which is a schematic diagram of heat treatment crystallization.

[0045] After experimental testing of the product obtained from FIG. 4, it can be determined that setting the first shielding part 1323 in the cover substrate layer 132 to replace the original ink layer 133 can meet the use requirements.

[0046] FIG. 5 is a schematic diagram of the experimental results of the transmittance of the blackened part and the transmittance of the transparent part in FIG. 4. As shown in FIG. 5, the transmittance of the blackened part T ≤ 0.5% @ 550 nm; the transmittance of the transparent part T ≥ 91.5% @ 550 nm.

[0047] Table 1 is the test results of the optical density (OD) value of the blackened part of the product in FIG. 4. As shown in Table 1, since the UTG thickness is ≥ 30 um, the blackened part has good light shielding effect, which can greatly improve the OD value of the blackened part. The measured OD value can reach ≥ 3 (the OD value of the ink layer 133 scheme only meets 1.5 (which can be used as a standard value)). Therefore, setting the first shielding part 1323 in the cover substrate layer 132 to replace the original ink layer 133 can not only reduce the PV value, but also improve the OD value.

[0048] Table 1

[0049] In one example embodiment, as an alternative to the scheme shown in Fig. 2, the following is provided:

[0050] Fig. 6 is a schematic diagram of the structure of another display panel. As shown in Fig. 6, and in combination with Fig. 2, the difference between the present embodiment and the embodiment shown in Fig. 2 is that the functional hole light transmission portion 1321, the display light transmission portion 1322, and the first shielding portion 1323 are provided in the protective layer 131; wherein the functional hole light transmission portion 1321, the display light transmission portion 1322, and the first shielding portion 1323 are integrally formed. That is, the first shielding portion 1323 is prepared in the protective layer 131, and the ink layer 133 is not prepared below the protective layer 131, so that there is no gap when the protective layer 131 is attached to the cover substrate layer 132, and the area PV value of the functional hole H covered by the protective layer 131 is small. Wherein, the first shielding portion 1323 can be prepared by using laser to locally ablate the surface of the PET layer, so that the local PET forms a black oxide layer.

[0051] It should be noted that the local ablation of the surface of the PET layer by laser is only an example method, and the present embodiment does not limit other methods, as long as the PET layer can be locally formed into black in the process.

[0052] In addition, the functional hole light transmission portion 1321, the display light transmission portion 1322, and the first shielding portion 1323 can also be provided in the protective layer 131 and the cover substrate layer 132 at the same time, which will not be described one by one here.

[0053] In one example embodiment, as another alternative to the scheme shown in Fig. 2, the following is provided:

[0054] Fig. 7 is a schematic diagram of the structure of another display panel. As shown in Fig. 7, and in combination with Fig. 2, the difference between the present embodiment and the embodiment shown in Fig. 2 is that the functional hole light transmission portion 1321, the display light transmission portion 1322, and the first shielding portion 1323 are provided in the second adhesive layer 134; wherein the functional hole light transmission portion 1321, the display light transmission portion 1322, and the first shielding portion 1323 are separately provided. This scheme is equivalent to preparing the ink layer 133 below the protective layer 131, but the functional hole light transmission portion 1321 is filled between the two ink layers 133, such as filling light oil, so that a flat surface without a gap is formed between the functional hole light transmission portion 1321 and the first shielding portion 1323, which can cover the functional hole H, and the PV value of the area of the functional hole H covered by the protective layer 131 is also small relative to the scheme with only the ink layer 133 when the protective layer 131 is subsequently adhered.

[0055] FIG. 8 is a structural schematic diagram of still another display panel. As shown in FIG. 8, a second shielding portion TA1 can be arranged on the side of the transition area TA of the display substrate 10 close to the laminated cover plate 13. In this way, the PV value of the area of the cover plate 13 covering the functional hole H is also small.

[0056] In other embodiments, the second shielding portion TA1 can be arranged only on the side of the transition area TA of the display substrate 10 close to the laminated cover plate 13, and the first shielding portion 1323 is no longer arranged on the side of the laminated cover plate 13.

[0057] In an exemplary embodiment, the display substrate 10 further includes a frame P. In order to prevent light leakage of the frame P, the laminated cover plate 13 is usually also provided with a frame ink layer 135 in the area corresponding to the frame P. However, this increases the thickness of the display panel and reduces the width of the frame P. Therefore, in the present embodiment, the cover plate substrate layer 132 and / or the protective layer 131 can further include a frame shielding portion corresponding to the frame P.

[0058] Exemplarily, FIG. 9 is a structural schematic diagram of still another display panel, and FIG. 10 is a structural schematic diagram of an original display panel. As shown in FIG. 9, the frame shielding portion 1324 is arranged on the cover plate substrate layer 132. As can be seen from FIGS. 9 and 10, the original display panel is provided with the frame ink layer 135 below the cover plate substrate layer 132, and a relatively thick first adhesive layer 12 is needed to absorb the gap, and the thickness of the first adhesive layer 12 is usually 150 μm. After the frame shielding portion 1324 is arranged on the cover plate substrate layer 132, there is no gap, and the thickness of the first adhesive layer 12 can be reduced to 25 μm, which greatly reduces the overall thickness of the display panel. It is found through simulation of the display panel that the thinner the thickness of the impact area of the display panel, the faster the impact deformation recovers, and thus reducing the thickness of the impact area will effectively improve the impact printing. As shown in FIG. 11, when the first adhesive layer 12 is relatively thick, the deformation of the abnormal reflection area is deep, and thus the recovery is slow. When the first adhesive layer 12 is relatively thin, the deformation of the abnormal reflection area is shallow, and thus the recovery is fast.

[0059] In an exemplary embodiment, the frame shielding portion can also be made by locally irradiating the light-sensitive glass, which can improve the accuracy of the visual area (VA area) of the cover plate 13 by 60% from the current ±0.1 mm to ±0.04 mm, thereby improving the bonding accuracy and exceeding the requirements of the narrow frame P0.8 mm on the material.

[0060] Further, the present application also provides a display device including the display panel of the above embodiments.

[0061] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A display panel, comprising: a display substrate comprising a functional hole, a display area and a transition area; the transition area is located between the functional hole and the display area; a laminated cover plate, at least one layer of the laminated cover plate is provided with a functional hole light transmission part corresponding to the functional hole, a display light transmission part corresponding to the display area and a first shielding part corresponding to the transition area, the first shielding part is located between the functional hole light transmission part and the display light transmission part, wherein one side of the first shielding part away from the display substrate, one side of the functional hole light transmission part away from the display substrate and one side of the display light transmission part away from the display substrate are located in the same plane.

2. The display panel of claim 1, wherein, the laminated cover plate comprises: a protective layer located on one side of the display substrate; an adhesive layer located on one side of the protective layer close to the display substrate; a cover plate substrate layer located between the adhesive layer and the display substrate and bonded with the protective layer through the adhesive layer; wherein the cover plate substrate layer is provided with the functional hole light transmission part, the display light transmission part and the first shielding part.

3. The display panel of claim 2, wherein, the functional hole light transmission part, the display light transmission part and the first shielding part are integrally formed.

4. The display panel of claim 2, wherein, the first shielding part at least partially overlaps with the transition area around the functional hole of the display substrate in the projection of the display substrate.

5. The display panel of claim 2, wherein, the first shielding part at least partially overlaps with the transition area around the functional hole of the display substrate in the projection of the display substrate.

6. The display panel of claim 2, wherein, the cover plate substrate layer is a photosensitive substrate layer prepared from a photosensitive material; the first shielding part is a crystalline part of the photosensitive substrate layer after being irradiated by light.

7. The display panel of claim 2, wherein, the thickness of the cover plate substrate layer is 30-150 um.

8. The display panel of claim 1, wherein, the laminated cover plate comprises: a protective layer located on one side of the display substrate; wherein the protective layer comprises the functional hole light transmission part, the display light transmission part and the first shielding part; the functional hole light transmission part, the display light transmission part and the first shielding part are integrally formed; an adhesive layer located on one side of the protective layer close to the display substrate; a cover plate substrate layer located between the adhesive layer and the display substrate and bonded with the protective layer through the adhesive layer.

9. The display panel of claim 1, wherein, the laminated cover plate comprises: a protective layer located on one side of the display substrate; an adhesive layer located on one side of the protective layer close to the display substrate; wherein the adhesive layer is provided with the functional hole light transmission part, the display light transmission part and the first shielding part; the functional hole light transmission part, the display light transmission part and the first shielding part are separately provided; a cover plate substrate layer located between the adhesive layer and the display substrate and bonded with the protective layer through the adhesive layer.

10. The display panel of any one of claims 2 to 9, wherein, the display substrate further comprises a frame; the cover plate substrate layer further comprises a frame shielding part corresponding to the frame.

11. The display panel of any one of claims 2 to 9, wherein, the display substrate further comprises a frame; the protective layer further comprises a frame shielding part corresponding to the frame.

12. The display panel of any one of claims 2 to 11, wherein, the modulus of the cover plate substrate layer is greater than or equal to 80 Gpa; the modulus of the protective layer is less than or equal to 8 Gpa.

13. The display panel of any one of claims 1-12, wherein, a second shielding part is provided on one side of the transition area close to the laminated cover plate.

14. A display device comprising the display panel of any one of claims 1 to 13.

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