Display panel and display device

Abstract

The utility model discloses a display panel and a display device. The display panel comprises a polarization layer, a first phase difference layer, a barrier layer, a second phase difference layer and a metal touch layer. The barrier layer is located between the first phase difference layer and the second phase difference layer and used for bonding the first phase difference layer and the second phase difference layer; the polarization layer is located on the side, away from the barrier layer, of the first phase difference layer, and the metal touch layer is located on the side, away from the barrier layer, of the second phase difference layer. According to the utility model, iodide ions can be prevented from diffusing downwards, so that metal corrosion is avoided, and the service life of the display panel is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] As consumers increasingly demand thinner electronic products, flexible packaging is gradually replacing rigid packaging as the industry mainstream.

[0003] The touch layer of a flexible display panel typically consists of a composite layer formed from titanium, aluminum, and titanium, which serves as the metallic conductive layer of the touch layer. However, under high temperature and humidity conditions, iodine ions in the polarizer of the flexible display panel can break free from the long chains of polyvinyl alcohol (PVA), diffuse outwards, and corrode the metallic conductive layer as they diffuse downwards to the touch layer. This causes the conductive layer to fail, thus affecting the functionality of the touch layer. Utility Model Content

[0004] This invention provides a display panel and display device to block the diffusion of iodine ions, thereby preventing metal corrosion and improving the service life of the display panel.

[0005] In a first aspect, this utility model embodiment provides a display panel, the display panel including a polarizing layer, a first phase difference layer, a blocking layer, a second phase difference layer and a metal touch layer;

[0006] The barrier layer is located between the first phase difference layer and the second phase difference layer, and the barrier layer is used to bond the first phase difference layer and the second phase difference layer;

[0007] The polarizing layer is located on the side of the first phase difference layer away from the blocking layer, and the metal touch layer is located on the side of the second phase difference layer away from the blocking layer.

[0008] Optionally, the polarizing layer includes a first protective layer, a second protective layer, and an iodine ion polarizer;

[0009] The iodine ion polarizer is located between the first protective layer and the second protective layer, and the second protective layer is located on the side of the first phase difference layer away from the blocking layer.

[0010] Optionally, the display panel further includes a first adhesive layer;

[0011] The first adhesion layer is disposed between the polarizing layer and the first phase difference layer.

[0012] Optionally, the display panel further includes a second adhesive layer;

[0013] The second adhesion layer is disposed between the metal touch layer and the second phase difference layer.

[0014] Optionally, the display panel may further include a touch protection layer;

[0015] The touch protection layer is located between the second adhesive layer and the metal touch layer.

[0016] Optionally, the materials of the first adhesive layer and the second adhesive layer are pressure-sensitive adhesives.

[0017] Optionally, the display panel further includes an upper blocking layer and a lower blocking layer;

[0018] The upper barrier layer is located between the first adhesive layer and the first phase difference layer; the lower barrier layer is located between the second adhesive layer and the second phase difference layer.

[0019] Optionally, the display panel further includes a substrate and a light-emitting layer;

[0020] The light-emitting layer is located on the side of the metal touch layer away from the blocking layer, and the substrate is located on the side of the light-emitting layer away from the metal touch layer.

[0021] Optionally, the material of the barrier layer is UV adhesive.

[0022] Secondly, embodiments of the present invention also provide a display device, including the display panel in any embodiment of the present invention.

[0023] This invention provides a display panel and display device. The display panel includes a polarizing layer, a first phase retardation layer, a blocking layer, a second phase retardation layer, and a metal touch layer. The blocking layer is located between the first and second phase retardation layers, the polarizing layer is located on the side of the first phase retardation layer away from the blocking layer, and the metal touch layer is located on the side of the second phase retardation layer away from the blocking layer. The blocking layer can both bond the first and second phase retardation layers and prevent iodine ions in the polarizing layer from leaching to the metal touch layer below, thus avoiding corrosion of the metal in the metal touch layer by iodine ions. This improves the reliability of the metal touch layer, solves the problem of easy failure of the touch function in existing display panels, and extends the service life of the display panel. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of another display panel provided in an embodiment of the present utility model;

[0026] Figure 3This is a schematic diagram of another display panel provided in an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present utility model. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present utility model, as shown below. Figure 1 As shown, the display panel includes a polarizing layer 110, a first phase difference layer 120, a blocking layer 130, a second phase difference layer 140, and a metal touch layer 150.

[0030] The blocking layer 130 is located between the first phase difference layer 120 and the second phase difference layer 140, and the blocking layer 130 is used to bond the first phase difference layer 120 and the second phase difference layer 140; the polarizing layer 110 is located on the side of the first phase difference layer 120 away from the blocking layer 130, and the metal touch layer 150 is located on the side of the second phase difference layer 140 away from the blocking layer 130.

[0031] The metal touch layer 150 includes a titanium-aluminum-titanium composite layer in a mesh-like structure, which can form different touch electrodes to enable touch recognition of the display panel. The polarizing layer 110 may include a polyvinyl alcohol (PVA) film and tricellulose acetate (TAC) films disposed on both sides of the PVA film. The TAC film has high light transmittance, good water resistance, and certain mechanical strength, protecting the PVA film. The PVA film can be prepared through a dyeing process, resulting in a certain iodine content. Without the barrier layer 130, under high-temperature conditions, iodine ions from the PVA film in the polarizing layer 110 easily diffuse to the metal touch layer 150, reacting with the metal in the metal touch layer 150 and causing touch failure. The specific process is as follows: Under prolonged high temperature and humidity conditions, iodine ions in the PVA film are released and diffuse downwards to the metal touch layer 150. Catalyzed by water, the iodine ions react with aluminum metal as follows: I + Al → AlI3, generating heat and causing a break in the metal traces in the metal touch layer 150, thus affecting the touch function. The first phase difference layer 120 and the second phase difference layer 140 can adjust the phase difference of polarized light using a liquid crystal polymer to optimize the wide-viewing-angle display effect. The blocking layer 130 can be made of a material capable of blocking the release of iodine ions and possesses a certain adhesive effect; for example, the blocking layer 130 can be made of UV adhesive.

[0032] Specifically, in order to prevent iodine ions in the polarizing layer 110 from ionizing to the metal touch layer 150, this embodiment of the invention provides a barrier layer 130 between the metal touch layer 150 and the polarizing layer 110 to prevent iodine ions in the polarizing layer from ionizing to the underlying metal touch layer and to prevent iodine ions from corroding the metal in the metal touch layer. Furthermore, to avoid increasing the thickness of the display panel due to the addition of the barrier layer 130, the pressure-sensitive adhesive (PSA) between the first phase retardation layer 120 and the second phase retardation layer 140 is replaced with the barrier layer 130. The barrier layer 130 can both replace the PSA to bond the first phase retardation layer 120 and the second phase retardation layer 140 without affecting the original function of the PSA, and also prevent iodine ions in the polarizing layer 110 from ionizing to the metal touch layer 150 below the second phase retardation layer 140, thus preventing iodine ions from diffusing to the metal touch layer 150 and avoiding corrosion of the metal in the metal touch layer 150, thereby improving the reliability of the metal touch layer 150. In addition, replacing the existing PSA in the phase retardation layer 120 and the second phase retardation layer 140 with the barrier layer 130 does not affect the original film structure, does not affect the changes in the manufacturing process of the display panel, and does not require changes to the display panel circuit design, resulting in lower production costs.

[0033] This utility model embodiment provides a display panel including a polarizing layer, a first phase retardation layer, a blocking layer, a second phase retardation layer, and a metal touch layer. The blocking layer is located between the first and second phase retardation layers, the polarizing layer is located on the side of the first phase retardation layer away from the blocking layer, and the metal touch layer is located on the side of the second phase retardation layer away from the blocking layer. The blocking layer can both bond the first and second phase retardation layers and prevent iodine ions in the polarizing layer from leaching to the metal touch layer below, thus avoiding corrosion of the metal in the metal touch layer by iodine ions. This improves the reliability of the metal touch layer, solves the problem of easy failure of the touch function in existing display panels, and extends the service life of the display panel.

[0034] This embodiment of the invention also provides another display panel. Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present utility model, as shown below. Figure 2 As shown, the polarizing layer 110 includes a first protective layer 1101, a second protective layer 1102, and an iodine ion polarizer 1103; the iodine ion polarizer 103 is located between the first protective layer 1101 and the second protective layer 1102, and the second protective layer 1102 is located on the side of the first phase difference layer 120 away from the blocking layer 130.

[0035] Specifically, the iodine ion polarizer 103 can be a PVA film. As the core layer of the polarizing layer 110, the iodine ion polarizer 103 forms its polarization characteristics through iodine dyeing and stretching. The first protective layer 1101 and the second protective layer 1102 are located on both sides of the iodine ion polarizer 103. The first protective layer 1101 and the second protective layer 1102 can be triacetate cellulose (TAC) films. TAC films have high light transmittance, good water resistance, and certain mechanical strength. The first protective layer 1101 and the second protective layer 1102 can work together to protect the iodine ion polarizer 103 and prevent it from becoming damp and deformed.

[0036] It should be noted that iodine ions in PVA films are unstable under prolonged high temperature and humidity conditions, and their detachment from the PVA long chains cannot be completely avoided. One way to achieve touch functionality in flexible packaging products is to add a patterned touch layer of Ti / Al / Ti metal after packaging, which forms a self-capacitance with the cathode to achieve touch control. However, this metal layer easily reacts with iodine ions released from the PVA film under high temperature and humidity conditions, leading to touch failure. To solve this problem, a film layer that can inhibit iodine diffusion in the direction of iodine diffusion needs to be used to replace the existing film structure without affecting its original function. This prevents iodine from diffusing into the metal film layer, thus avoiding corrosion of the metal film layer by iodine ions under prolonged high temperature and humidity conditions. Based on this, this embodiment of the invention provides a barrier layer 130 between the first phase retardation layer 120 and the second phase retardation layer 140. The barrier layer 130 can both replace the pressure-sensitive adhesive in bonding the first phase retardation layer 120 and the second phase retardation layer 140 without affecting the original function of the pressure-sensitive adhesive, and also prevent iodine ions in the polarizing layer 110 from dispersing to the metal touch layer 150 below the second phase retardation layer 140. This prevents iodine ions from diffusing into the metal touch layer 150, avoiding corrosion of the metal in the metal touch layer 150 and improving the reliability of the metal touch layer 150. Furthermore, the barrier layer 130 does not affect the original film structure, does not affect changes in the manufacturing process of the display panel, does not require changes to the display panel circuit design, and has lower production costs.

[0037] like Figure 2 As shown, optionally, the display panel also includes a first adhesive layer 1601; the first adhesive layer 1601 is disposed between the polarizing layer 110 and the first phase difference layer 120.

[0038] Specifically, the first adhesive layer 1601 is disposed between the polarizing layer 110 and the first phase difference layer 120, which enables flexible bonding between the polarizing layer 110 and the first phase difference layer 120. The first adhesive layer 1601 has a certain buffering effect to prevent the polarizing layer 110 or the first phase difference layer 120 from cracking under stress.

[0039] like Figure 2 As shown, optionally, the display panel also includes a second adhesive layer 1602; the second adhesive layer 1602 is disposed between the metal touch layer 150 and the second phase difference layer 140.

[0040] Specifically, the second adhesive layer 1602 is disposed between the metal touch layer 150 and the second phase difference layer 140, which enables flexible bonding between the metal touch layer 150 and the second phase difference layer 140. The second adhesive layer 1602 has a certain buffering effect to prevent the metal touch layer 150 or the second phase difference layer 140 from cracking under stress.

[0041] Furthermore, the first phase retardation layer 120 can be a half-wave plate (HWP), which can adjust the phase difference (180°) of polarized light through the liquid crystal polymer to optimize the wide viewing angle display effect. The second phase retardation layer 140 can be a quarter-wave plate (QWP), which can generate a 90° phase difference and work with the HWP to achieve circular polarization conversion, reducing screen reflection. The metal touch layer 150 can be a transparent conductive layer, allowing light emitted from the pixels below the metal touch layer 150 to pass through it.

[0042] like Figure 2 As shown, optionally, the display panel also includes a touch protection layer 170; the touch protection layer 170 is located between the second adhesive layer 1602 and the metal touch layer 150.

[0043] Specifically, the touch protection layer 170 is located on the surface of the metal touch layer 150 and serves to protect the metal traces in the metal touch layer 150. The touch protection layer 170 can be a protective coating layer located on the surface of the metal touch layer 150. Since the metal touch layer 150 includes a large number of metal traces, its chemical stability is poor, and it is prone to chemical reactions with water, oxygen, etc., and is easily affected by the chemical substances of other films in the display panel. In this embodiment of the present invention, the use of the touch protection layer 170 can improve the reliability of the metal touch layer 150 and increase its service life.

[0044] Optionally, the materials of the first adhesive layer 1601 and the second adhesive layer 1602 are pressure-sensitive adhesives.

[0045] Specifically, both the first adhesion layer 1601 and the second adhesion layer 1602 are film layers formed using pressure-sensitive adhesive. Pressure-sensitive adhesive is a type of adhesive that is sensitive to pressure and has good optical properties, bonding performance, temperature resistance, corrosion resistance, and oxidation resistance. The pressure-sensitive adhesive enables flexible bonding of the polarizing layer 110 and the first phase retardation layer 120, as well as flexible bonding of the metal touch layer 150 and the second phase retardation layer 140.

[0046] It should be noted that the first phase difference layer 120 and the second phase difference layer 140 can also be bonded together with pressure-sensitive adhesive. However, pressure-sensitive adhesive does not have the function of blocking the diffusion of iodine ions. Therefore, in this embodiment of the present invention, the first phase difference layer 120 and the second phase difference layer 140 are bonded together by the blocking layer 130, which replaces the pressure-sensitive adhesive between the first phase difference layer 120 and the second phase difference layer 140. This not only achieves the original function of the pressure-sensitive adhesive in bonding the first phase difference layer 120 and the second phase difference layer 140, but also prevents iodine ions in the polarizing layer 110 from ionizing to the metal touch layer 150 below the second phase difference layer 140, thus avoiding corrosion of the metal in the metal touch layer 150 by iodine ions and improving the reliability of the metal touch layer 150.

[0047] Figure 3 This is a schematic diagram of another display panel structure provided in an embodiment of the present utility model, as shown below. Figure 3 As shown, optionally, the display panel also includes a substrate 1801 and an emissive layer 1802; the emissive layer 1802 is located on the side of the metal touch layer away from the blocking layer, and the substrate is located on the side of the emissive layer away from the metal touch layer.

[0048] Specifically, the light-emitting layer 1802 includes multiple organic light-emitting elements, which are electrically connected to each other. Light is emitted through each organic light-emitting element to realize the display of the image on the display panel. The substrate 1801 can be a flexible substrate with good bending performance to enable the display panel to be bent.

[0049] Optionally, the material of the barrier layer 130 is UV adhesive.

[0050] Specifically, the barrier layer 130 is formed of UV adhesive, also known as shadowless adhesive or ultraviolet glue. UV adhesive can be used as an adhesive or as a binder in paints, coatings, inks, etc. The curing principle of UV adhesive is that the photoinitiator in the UV adhesive absorbs ultraviolet light under ultraviolet irradiation, generating active free radicals or cations, initiating monomer polymerization, cross-linking, and grafting chemical reactions, causing the UV adhesive to transform from a liquid to a solid state within seconds. UV adhesive has characteristics such as high bonding strength, excellent optical performance, colorless and transparent adhesive, light transmittance >90% after curing, and high corrosion resistance. The advantages of using UV adhesive as the material for the barrier layer 130 are: replacing the PSA adhesive between the first phase difference layer 120 and the second phase difference layer 140 with UV adhesive not only acts as an adhesive but also forms a dense barrier layer 130 after curing, preventing the downward diffusion of iodine ions and thus avoiding corrosion of the metal touch layer 150; replacing PSA adhesive with UV adhesive does not lead to a significant increase in cost; and no changes are required in the panel circuit design.

[0051] Optionally, the materials of the first adhesive layer 1601 and the second adhesive layer 1602 are also UV adhesives, that is, the first adhesive layer 1601 and the second adhesive layer 1602 are also formed by UV adhesives, thereby further preventing the downward diffusion of iodine ions in the polarizing layer 110, and thus avoiding the corrosion of the metal touch layer 150.

[0052] Figure 4 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present utility model, as shown below. Figure 4 As shown, optionally, the display panel also includes an upper blocking layer 1901 and a lower blocking layer 1902; the upper blocking layer 1901 is located between the first adhesive layer 1601 and the first phase difference layer 120; the lower blocking layer 1902 is located between the second adhesive layer 1602 and the second phase difference layer 140.

[0053] Specifically, the upper barrier layer 1901 and the lower barrier layer 1902 can be formed by UV adhesive, which can block iodine ions in the polarizing layer 110 from diffusing downwards, further preventing the metal touch layer 150 from being corroded by iodine ions, and further improving the reliability of the metal touch layer 150.

[0054] This utility model embodiment provides a display panel with a barrier layer located between a first phase difference layer and a second phase difference layer. The barrier layer can not only bond the first and second phase difference layers, but also prevent iodine ions in the polarizing layer from ionizing to the underlying metal touch layer, thus avoiding corrosion of the metal in the metal touch layer by iodine ions. This improves the reliability of the metal touch layer, solves the problem of easy failure of the touch function in existing display panels, and extends the service life of the display panel.

[0055] This utility model embodiment also provides a display device, including the display panel of any of the above embodiments.

[0056] Specifically, the display device provided in this embodiment includes the display panel proposed in any of the above embodiments, and has the beneficial effects of the display panel proposed in the above embodiments, which will not be repeated here. For example, the display device can be a mobile phone, a wearable device with display function, a computer, or other display devices.

[0057] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized by, The display panel includes a polarizing layer, a first phase difference layer, a blocking layer, a second phase difference layer, and a metal touch layer; The barrier layer is located between the first phase difference layer and the second phase difference layer, and the barrier layer is used to bond the first phase difference layer and the second phase difference layer; The polarizing layer is located on the side of the first phase difference layer away from the blocking layer, and the metal touch layer is located on the side of the second phase difference layer away from the blocking layer.

2. The display panel of claim 1, wherein, The polarizing layer includes a first protective layer, a second protective layer, and an iodine ion polarizer; The iodine ion polarizer is located between the first protective layer and the second protective layer, and the second protective layer is located on the side of the first phase difference layer away from the blocking layer.

3. The display panel of claim 1, wherein, It also includes a first adhesive layer; The first adhesion layer is disposed between the polarizing layer and the first phase difference layer.

4. The display panel of claim 3, wherein, It also includes a second adhesive layer; The second adhesion layer is disposed between the metal touch layer and the second phase difference layer.

5. The display panel of claim 4, wherein, It also includes a touch protection layer; The touch protection layer is located between the second adhesive layer and the metal touch layer.

6. The display panel of claim 4, wherein, The materials of the first adhesive layer and the second adhesive layer are pressure-sensitive adhesives.

7. The display panel of claim 4, wherein, It also includes an upper barrier layer and a lower barrier layer; The upper barrier layer is located between the first adhesive layer and the first phase difference layer; the lower barrier layer is located between the second adhesive layer and the second phase difference layer.

8. The display panel of claim 1, wherein, It also includes a substrate and a light-emitting layer; The light-emitting layer is located on the side of the metal touch layer away from the blocking layer, and the substrate is located on the side of the light-emitting layer away from the metal touch layer.

9. The display panel of any of claims 1-8, wherein, The barrier layer is made of UV adhesive.

10. A display device, characterized by comprising: Includes the display panel as described in any one of claims 1-9.

Images