CN113873816A

CN113873816A - Cover plate and preparation method thereof

Info

Publication number: CN113873816A
Application number: CN202111080644.2A
Authority: CN
Inventors: 陈荣坤
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2021-12-31
Anticipated expiration: 2041-09-15
Also published as: CN113873816B

Abstract

The embodiment of the invention provides a cover plate and a preparation method of the cover plate, when the cover plate is prepared and formed, the cover plate layer is processed by adopting a laser carbonization process, after the laser carbonization process is completed, a carbonization area is formed at the edge area of the cover plate, the carbonization area and the cover plate are on the same layer, and the carbonization area is a light-tight area, so that the function of shielding light rays at the edge area can be effectively realized, the preparation process of the cover plate is improved, and the performance of the cover plate is effectively improved.

Description

Cover plate and preparation method thereof

Technical Field

The invention relates to the technical field of display panel manufacturing, in particular to a cover plate and a preparation method thereof.

Background

With the continuous improvement of display panel preparation technology and preparation process, people have higher and higher requirements on the performance of prepared display panels and devices.

The display panel has the advantages of high image quality, power saving, light and thin body, and wide application range, and is widely used in various consumer electronics products such as mobile phones and televisions, and becomes the mainstream device in the display device. The display panel is composed of a plurality of film layers. Therefore, the performance and quality of each film layer will have a significant impact on the performance of the display panel. In the prior art, when the above film layers are formed, the preparation process is generally complex, for example, when a cover plate for forming a display panel is prepared, because the cover plate is required to be arranged in a light-transmitting area and a non-light-transmitting area at the edge as a protective layer, when the film layer in the non-light-transmitting area is arranged, the cover plate is often prepared by adopting the traditional processes such as printing and the like, a layer of black ink is coated above or below the film layer at the edge area of the cover plate, and the black film layer is formed after the black ink is dried, so that the black non-light-transmitting area is realized. The operation of the preparation process is complex, and the prepared black ink film layer is easy to fall off or tear and other quality problems, so that the shading effect is reduced, and finally the quality problems of the display panel are caused.

In summary, in the conventional display device, when a cover plate layer or a protective layer forming a panel is prepared, the preparation process is complicated, and the prepared black ink film layer is prone to quality problems such as falling or tearing after being used for a long time. Is not beneficial to improving the comprehensive performance of the panel.

Disclosure of Invention

The embodiment of the invention provides a cover plate and a preparation method thereof, which aim to effectively improve the preparation process of the cover plate, prevent the quality problems of falling, tearing and the like easily occurring at the shading area of the cover plate, improve the performance of the cover plate and finally improve the quality and reliability of a display panel.

In order to solve the above technical problem, the technical method provided by the embodiment of the present invention is as follows:

in a first aspect of the embodiments of the present invention, a method for manufacturing a cover plate is provided, including the following steps:

providing a substrate;

coating an organic high polymer material on the substrate, drying the organic high polymer material, and forming a first film layer;

carrying out high-temperature treatment on the corresponding first film layer in the edge area of the substrate to enable the first film layer in the edge area to form a carbonization area and obtain a second film layer;

cutting the second film layer of the carbonized region and forming the cover plate.

According to an embodiment of the present invention, when the first film layer is processed at a high temperature, a laser carbonization process is used for processing.

According to an embodiment of the present invention, when performing the laser carbonization process, the method further includes the following steps:

providing a laser generator;

adjusting the power of the laser generator and irradiating the first film layer in the edge area;

moving the laser generator along the periphery of the edge region and obtaining the carbonized region.

According to an embodiment of the present invention, during the moving of the laser generator, the method further includes the steps of:

and controlling the position of the laser generator to ensure that the distance between the laser generator and the edge of the first film layer is the same in the process of moving the laser generator in each circle.

According to an embodiment of the present invention, when the first film layer in the edge region is irradiated, the first film layer is carbonized by means of step irradiation.

According to an embodiment of the invention, when the step-by-step irradiation mode is adopted, the depths of the first film layers irradiated by the laser generators in the asynchronous irradiation processes are different; in the same step of irradiation process, the power of the laser generators is the same, and the power of the laser generators is different between asynchronizations.

According to an embodiment of the invention, during the laser carbonization process, the power of the laser is 5W-10W, and the moving speed of the laser is 650mm/s-720 mm/s.

According to an embodiment of the present application, the organic polymer material includes at least one of a polyester resin and a transparent polyimide.

According to a second aspect of the embodiments of the present invention, there is also provided a cover plate, including:

a light-transmitting region and a peripheral region disposed around the light-transmitting region;

the edge region further comprises a carbonization region, the carbonization region is opaque, and the carbonization region is prepared by the cover plate preparation method provided by the embodiment of the application.

According to an embodiment of the present application, the width of the carbonized region is 1mm to 2 mm.

In summary, the embodiments of the present invention have the following beneficial effects:

the embodiment of the invention provides a cover plate and a preparation method thereof. To improve the performance of a cover plate and a protective layer of a display panel. In the embodiment of the application, when preparation forms the apron, adopt laser carbonization technology to handle apron layer or protective layer, laser carbonization technology handles the back of accomplishing, can form a carbonization region in the marginal zone department of apron, and this carbonization region is with the same layer with the apron, and this carbonization region is light tight region, and then can effectually play the effect of sheltering from to marginal zone's light, the effectual performance that improves the apron, and simultaneously, this carbonization region is with the apron is with the same layer in the apron that obtains in the embodiment of the application, thereby the effectual problem that drops easily between apron and the carbonization region among the prior art of having prevented, the effectual performance that improves the apron.

Drawings

The technical solution and other advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 is a top view and a side view of a portion of a film layer in a display panel according to the prior art;

fig. 2 is a schematic structural diagram of a cover plate layer provided in an embodiment of the present application;

fig. 3 is a schematic flow chart of a manufacturing process of a cover plate according to an embodiment of the present disclosure;

fig. 4 is a diagram illustrating a film structure corresponding to a manufacturing process provided in an embodiment of the present disclosure;

fig. 5 is a scanning electron micrograph of the film layer material of the carbonized region provided in the example of the present application.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

With the continuous development of display panel manufacturing technology, people have higher and higher requirements on the display performance and the panel quality of the display panel. Not only is the overall thickness of the display panel desired to be smaller, but also the display panel is desired to have higher quality and reliability.

As shown in fig. 1, fig. 1 is a top view and a side view of a portion of a film layer in a display panel provided in the prior art. In the display panel, the display panel includes a cover plate 100 and a light-shielding layer 102 in a top view of the display panel. The cover plate 100 of the display panel includes a light-transmitting region 104 and an edge region 103. The edge region 103 is disposed around the light-transmitting region 104. A light-shielding layer 102 is further disposed in the edge region 103, and the light-shielding layer 102 is disposed on the cover plate 100. The light-shielding layer 102 is formed by preparing black ink. Therefore, the light-shielding layer 102 is a black opaque layer, so as to effectively shield the light inside the display panel, and prevent the light inside the display panel from penetrating from the edge area 103 and affecting the performance of the display panel.

Since the light-shielding layer 102 is disposed on the cover plate 100, the light-shielding effect can be achieved by disposing two side film layers. Meanwhile, the width of the light-shielding layer 102 is small, so that the light-shielding layer 102 and the cover plate 100 are prone to falling off and cracking in the subsequent use process, and the edge region 103 cannot achieve an effective light-shielding effect and adversely affects the quality of the display panel.

In the embodiment of the application, a cover plate is provided, and the structure of the cover plate layer is improved, so that the problems of light leakage, falling off and the like easily occur at the edge area of the cover plate are effectively improved.

As shown in fig. 2, fig. 2 is a schematic structural diagram of a cover plate layer provided in an embodiment of the present application. The cover sheet layer 200 provided in the embodiment of the present application includes a light-transmitting region 202 and a carbonized region 203. Wherein the carbonized region 203 may surround the light transmitting region 202, such as being disposed at an edge region of the light transmitting region 202.

Specifically, the light-transmitting region 202 corresponds to a display region of the display panel, and the carbonized region 203 corresponds to a frame non-display region of the display panel. Meanwhile, the corresponding film in the carbonization area 203 provided in the embodiment of the present application is an opaque film, for example, if the corresponding film in the carbonization area 203 is set as a black film, when external light reaches the transparent area 202, the light can normally penetrate through the transparent area 202. When the external light reaches the carbonized region 203, the light cannot be transmitted through the region. And then make apron layer 200 not only play the effect of protection, can also shelter from the light of frame region department simultaneously to effectual light that prevents leaks from carbonization region 203, and the display effect of influence panel.

In the embodiment of the present application, when the cover plate layer 200 is disposed, the corresponding film layers at the peripheral edges of the cover plate layer 200 are processed, so that the edge region of the cover plate layer 200 forms a carbonization region 203, and a carbonization layer 201 is disposed in the carbonization region 203. The carbonized region 203 is a non-light-transmitting region, and light cannot pass through the carbonized layer 201 when passing through. In the embodiment of the present application, the cover plate layer 200 corresponding to the region is set as the black film layer, and the laser carbonization process of the cover plate layer 200 corresponding to the region can be performed without damaging the structure of the cover plate layer 200, so that the film layer at the region forms the carbonized layer 201 structure, thereby achieving the purpose of the shading effect.

Specifically, in order to ensure the light shielding effect of the carbonized region 203 of the cover plate layer 200, in the embodiment of the present application, the width of the film layer of the carbonized region 203 corresponding to the region is set to be between 1mm and 2 mm. Within this width interval, can not only effectual assurance display panel have the biggest screen account for than, can also be better make apron layer 200 shelter from the light of frame region department to effectual assurance apron layer 200's performance, and finally improve display panel's reliability.

In the embodiment of the application, the light shielding layer corresponding to the carbonization region 203 is directly arranged on the same layer as the cover plate layer 200, so that the quality problems of falling, tearing and the like easily occurring between different film layers are effectively avoided. Thereby achieving the purpose of improving the reliability of the panel.

Further, the material of the cover plate layer 200 provided in the embodiment of the present application may be an organic polymer material. Specifically, the organic polymer material may include at least one of a polyester resin or a polyimide material. When the macromolecular material who chooses for use is the polyimide material, this polyimide material is transparent polyimide film layer material to the light transmissivity of effectual improvement apron, and improve display panel's display effect. Preferably, the material for manufacturing the cover plate layer 200 may also be other transparent materials, which are not described in detail herein.

In order to ensure the light shielding and light absorbing effects of the carbonized region 203 formed at the edge region of the cover plate, in the embodiment of the present application, the film layer in the carbonized region 203 is black, and the optical density value of the corresponding film layer material at the prepared carbonized region 203 is not less than 5 lg. To effectively increase the light absorption effect at the carbonized region 203.

Further, the embodiment of the application also provides a preparation method of the cover plate. As shown in fig. 3, fig. 3 is a schematic flow chart of a manufacturing process of the cover plate according to the embodiment of the present disclosure. When the cover plate forming the embodiment of the application is prepared, the method comprises the following steps:

s100: providing a substrate;

s101: coating an organic high polymer material on the substrate, drying the organic high polymer material, and forming a first film layer;

s102: carrying out high-temperature treatment on the corresponding first film layer in the edge area of the substrate to enable the first film layer in the edge area to form a carbonization area and obtain a second film layer;

s103: cutting the second film layer of the carbonized region and forming the cover plate.

Specifically, when the cover plate structure provided in the embodiment of the present application is manufactured, referring to fig. 4, fig. 4 is a film layer structure diagram corresponding to the manufacturing process provided in the embodiment of the present application. A substrate 400 is first provided. In the embodiment of the present application, the substrate 400 may be a glass substrate or a substrate made of other materials. So that other layers can be subsequently formed on the glass substrate 400.

In the embodiment of the present application, the organic polymer material 401 is coated on the substrate 400, and when the organic polymer material 401 is coated, the organic polymer material 401 may be coated by a printing process of inkjet printing, or the organic polymer material 401 may be directly and uniformly applied to the substrate 400 by dropping. In the coating process, the organic polymer material 401 is ensured to have better consistency in different regions of the substrate 400.

After the organic polymer material 401 is coated, it is treated. The substrate 400 is left standing for a certain period of time, and then the organic polymer material 401 on the substrate 400 is dried. Specifically, the substrate 400 may be transferred to a drying oven during the drying process, and dried at a drying temperature of 70 ℃ for 30min to 60 min. The organic polymer material 401 coated on the surface of the substrate 400 is dried and a first film layer 4011 is formed. The thickness of the first film 4011 formed at this time is the same in different regions of the substrate 400, thereby ensuring the performance of the first film 4011. Specifically, during coating, a transparent polyimide liquid material may be selected, and a certain amount of the transparent polyimide material is dropped on the surface of the substrate 400 and dried to form the first film 4011.

After the first membrane layer 4011 is prepared, the first membrane layer 4011 is continuously processed. The edge area of the cover plate layer prepared in the embodiment of the application needs to have the shading effect. Therefore, in the embodiment of the present application, the material at the edge region of the first film 4011 is processed.

Specifically, high temperature processing is performed on the corresponding film layers at the peripheral edge region of the first film layer 4011. Since the first film 4011 is made of organic polymer material, C, N, H and O elements in the organic polymer material are decomposed first under the action of high temperature, and after the decomposition of the elements is completed, a substance with high carbon content is left on the first film 4011, and a carbonized region 103 is formed in the edge region. The substance with high carbon content is generally black or opaque, so that the film layer in the carbonized region 103 is black or opaque, and when light irradiates the region, the light cannot pass through the film layer in the carbonized region 103, thereby achieving the effect of shading light.

Further, in forming the carbonized region 103 in the embodiment of the present application, the first film material in the region is carbonized by a high temperature treatment, and a black film is formed. For high temperature processing it is ensured that carbonization of the material in this region can take place and that the material in this region is not burnt. The high temperature treatment in the embodiments of the present application is described by taking a laser carbonization process as an example.

When the laser carbonization process treatment is carried out, the method also comprises the following steps:

providing a laser generator;

Specifically, a laser generator 403 is provided, and various parameters of the laser generator 403 are adjusted. Such as power parameters, speed of movement during processing, etc. In the embodiment of the present application, since the material of the first film 4011 is a transparent polyimide material, the power of the laser generator 403 is set to be 5W-10W, and the speed of the laser generator 403 during the moving process is set to be 650mm/s-720 mm/s. Specifically, the power of the laser generator 403 is 8W, and the moving speed is 700 mm/s. When the material of the first film 4011 is selected as other material, the above parameters are adjusted to achieve the best processing effect of the film.

The substrate is transferred under the laser generator 403 and the laser generator 403 is aligned with the edge region 120. At this time, the laser generator 403 is turned on to operate normally, and the edge area 120 is irradiated along a certain path. Since the laser light generated by the laser generator 403 has higher energy, when the higher energy is applied to the first film layer in the edge region 120, the material in the first film layer undergoes carbonization, and black carbon 402 remains in the irradiated region, so that the region is opaque.

In the present embodiment, the laser generator 403 moves clockwise until it completes one round of the irradiation process around the edge area 120. When the laser energy is different, the depth of the processed film layer is also different. Therefore, in the present embodiment, in order to improve the processing effect, when the laser carbonization process is performed, the irradiation method of step irradiation is used for processing. The laser generator 403 is controlled to process the first film layer with different thickness. From shallow to deep until the first film layer with the preset thickness is carbonized.

Specifically, as in the first step, the laser intensity of the laser generator is adjusted to a1 at which the thickness of the film that can be processed is D1, and irradiation is performed along the edge region at that intensity, and a carbonized region 103 is formed.

And performing a second step of processing, wherein the laser intensity A2 of the laser generator is adjusted, and the film thickness which can be processed under the laser intensity is D2, wherein D2 is larger than D1. The laser beam of this intensity is irradiated to the entire carbonized region 103 along the carbonized region 103, and at this time, the thickness of the first film layer which can be carbonized becomes D2, and the depth of the carbonization is further increased, thereby ensuring the light shielding effect of the carbonized region 103.

And continuously adjusting the laser intensity of the laser generator until the film layer with the preset depth is irradiated, and stopping the laser carbonization process. Finally, a desired film effect is formed in the carbonized region 103, and when light passes through the region, the light can be effectively shielded and absorbed by the carbon black formed by carbonization, as shown in fig. 5, where fig. 5 is a scanning electron microscope image of the film material in the carbonized region provided in the embodiment of the present application. Because the material in the area is carbonized at high temperature by laser, more black carbon 402 remains in the area, and the black carbon 402 is uniformly distributed on the film layer, when light is irradiated, the black carbon can better absorb the light.

The above steps are only examples, and in the actual production process, various parameters of the laser generator can be adjusted according to the needs of the film layer and the size and thickness of the formed carbonized region 103.

Preferably, the laser generator irradiates the edge area along a certain path, so that the distance between the laser generator and the outer edge of the first film layer is ensured to be the same in each circle of movement process, the laser generator is controlled to have better consistency in asynchronous treatment, and the effect of laser carbonization treatment is ensured. Meanwhile, in the same step, various parameter values of the laser generators are the same, namely the power of the laser generators in the same step is the same, and the power of the unsynchronized laser generators is different. Further, in the embodiment of the present application, after the laser carbonization treatment, the film strength of the first film layer in the edge area changes only to a certain extent, but the change does not affect the normal use of the first film layer.

When all the steps of irradiation are completed, the carbonized region 103 provided in the embodiment of the present application and the second film layer 500 are finally formed. Wherein the width of the formed carbonized region 103 is 1mm to 2 mm. One side of the carbonized region 103 is the same as the outer side of the second film layer 500. So as to ensure the shielding effect of the outermost edge on light.

Finally, the formed second film layer 500 is cut, and a cover plate with a predetermined dimension is finally formed.

The above embodiment of the present invention provides a cover plate and a method for manufacturing the cover plate, and a specific example is applied to illustrate the principle and the embodiment of the present invention, and the above embodiment is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The preparation method of the cover plate is characterized by comprising the following steps:

providing a substrate;

2. The method for manufacturing a cover plate according to claim 1, wherein the first film layer is treated by a laser carbonization process at the time of high temperature treatment.

3. The method for manufacturing a cover plate according to claim 2, further comprising the steps of, when performing the laser carbonization process:

providing a laser generator;

4. The method for preparing a cover plate according to claim 3, further comprising the steps of, during the moving of the laser generator:

5. The method for producing a cover sheet according to claim 3, wherein the first film layer is carbonized by stepwise irradiation while irradiating the first film layer in the edge region.

6. The method for preparing a cover plate according to claim 5, wherein the laser generator irradiates the first film layer at different depths in different irradiation processes in a step-by-step irradiation manner; in the same step of irradiation process, the power of the laser generators is the same, and the power of the laser generators is different between asynchronizations.

7. The method for preparing the cover plate according to claim 2, wherein the power of the laser is 5W-10W and the moving speed of the laser is 650mm/s-720mm/s during the laser carbonization process.

8. The method of manufacturing a cover plate according to claim 1, wherein the organic polymer material includes at least one of a polyester resin and a transparent polyimide.

9. A cover plate, comprising:

wherein the edge region further comprises a carbonized region, the carbonized region is opaque to light, and the carbonized region is prepared by the preparation method according to any one of claims 1 to 8.

10. The cover sheet according to claim 9, wherein the width of the carbonized region is 1mm to 2 mm.