阅读说明：本技术 一种柔性显示母板、柔性amoled显示面板及柔性显示器件 (Flexible display mother board, flexible AMOLED display panel and flexible display device ) 是由 于东亮 于 2018-08-30 设计创作，主要内容包括：本发明提供一种柔性显示母板、柔性AMOLED显示面板及柔性显示器件,所述柔性显示母板包括显示区和非显示区,所述非显示区包括基板以及位于基板上的柔性聚合物层,所述显示区位于柔性聚合物层之上,所述基板上背离显示区的一面的边缘区域设置吸收LLO激光区。本发明通过在柔性显示母板上的基板背离显示区的一面的边缘区域设置吸收LLO激光区,使得该柔性显示母板在通过LLO激光照射分离时,可以适当增大LLO的激光能量,保证柔性聚合物层的碳化均匀以及充分分离,具有可控性,避免显示区受损,保证由其经过激光照射分离得到的柔性AMOLED显示面板不受损,保证其具有良好的性能,应用前景广阔。(The invention provides a flexible display mother board, a flexible AMOLED display panel and a flexible display device, wherein the flexible display mother board comprises a display area and a non-display area, the non-display area comprises a substrate and a flexible polymer layer positioned on the substrate, the display area is positioned on the flexible polymer layer, and an edge area of one surface of the substrate, which is far away from the display area, is provided with an LLO laser absorption area. According to the invention, the LLO laser absorption area is arranged in the edge area of one side of the substrate on the flexible display motherboard, which is far away from the display area, so that when the flexible display motherboard is separated by LLO laser irradiation, the laser energy of LLO can be properly increased, the uniform carbonization and sufficient separation of the flexible polymer layer are ensured, the controllability is realized, the damage of the display area is avoided, the flexible AMOLED display panel obtained by the flexible AMOLED display panel separated by the flexible display motherboard through laser irradiation is ensured not to be damaged, the good performance is ensured, and the application prospect is wide.)

1. A flexible display mother board is characterized by comprising a display area and a non-display area, wherein the non-display area comprises a substrate and a flexible polymer layer positioned on the substrate, the display area is positioned on the flexible polymer layer, and an edge area of one side of the substrate, which is far away from the display area, is provided with an LLO laser absorption area.

2. The flexible display mother board according to claim 1, wherein the LLO laser absorption region is 5 to 50mm from the edge of the substrate;

preferably, the LLO laser absorption regions are distributed in a dot shape or a strip shape;

preferably, the absorbing LLO laser regions are symmetrically distributed on the substrate.

3. The flexible display mother substrate according to claim 1 or 2, wherein when the LLO laser absorption regions are arranged in dots, each dot region has an area of 100 μm²～1cm²；

Preferably, when the LLO laser absorption regions are distributed in stripes, the width of the stripes is 10 μm to 1 cm.

4. The flexible display mother board according to any one of claims 1 to 3, wherein the material absorbing the LLO laser region is any one or a combination of at least two of an organic glue-based material, a semiconductor film material, a metal material, or a carbon material;

preferably, the material for absorbing the LLO laser region is photosensitive adhesive or TiO₂Any one or combination of at least two of film, ZnO gel film, titanium, aluminum, chromium, graphite powder or carbon black powder;

preferably, the photosensitive glue is preferably a UV glue.

5. The flexible display motherboard of any of claims 1-4, wherein the display area comprises pixel circuitry and a pixel region;

preferably, one of said flexible display motherboards comprises at least two display areas on top of the flexible polymer layer.

6. The flexible display motherboard of any of claims 1-5, wherein the display area is rectangular, square, circular, or other shape;

preferably, the substrate is a glass substrate;

preferably, the flexible polymer layer is a polyimide layer, a polyethylene terephthalate layer, a polyethylene naphthalate layer, a polycarbonate layer, a polyethersulfone layer, a polyacrylate layer, a polyetherimide layer, a polyamide layer, or a polyetheretherketone layer.

7. A method of substrate separation of a flexible display mother panel according to any of claims 1 to 6, the method comprising: and irradiating the back surface of the substrate of the flexible display mother board by using LLO laser to realize uniform carbonization of the flexible polymer layer, thereby realizing the separation of the flexible polymer layer and the substrate.

8. The method of claim 7, wherein the LLO laser wavelength is in the ultraviolet region;

preferably, the LLO laser wavelength is 308 nm.

9. A flexible AMOLED display panel, wherein the flexible AMOLED display panel is obtained by separating and removing the substrate from the flexible display motherboard according to any one of claims 1-6.

10. A flexible display device comprising the flexible AMOLED display panel of claim 9.

Technical Field

The invention belongs to the technical field of flexible display devices, and relates to a flexible display mother board, a flexible AMOLED display panel and a flexible display device.

Background

Implementing each process flow of an Active Matrix Organic Light Emitting Diode (AMOLED) on a glass substrate coated with a high-temperature resistant Polyimide (PI) film, and then separating the flexible PI film from the glass substrate to obtain a flexible AMOLED display screen on the polyimide;

the common technology for separating the PI film from the glass substrate is Laser Lift-off (LLO), Laser irradiates the PI film from the back of the substrate glass, and the irradiated PI surface layer is carbonized due to the strong absorption of the PI film on the specific Laser wavelength, so that the adhesion between the PI film and the glass substrate is reduced, and the separation of the PI film and the glass substrate is realized.

However, when the LLO laser energy is weak, the PI carbonization is not uniform or sufficient, and the adhesion and pulling phenomena are likely to occur when the LLO laser energy is separated from the glass substrate, which may cause the failure of the AMOLED device on the PI thin film; when the LLO laser energy is strong, PI carbonization is too sufficient, and when the LLO laser energy is separated from the glass substrate, uncontrollable risks such as self-shedding exist, and subsequent process is affected.

Disclosure of Invention

In view of the defects of the prior art, the present invention provides a flexible display mother board, a flexible display panel and a flexible display device.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, the present invention provides a flexible display mother board, which includes a display region and a non-display region, where the non-display region includes a substrate and a flexible polymer layer on the substrate, the display region is located on the flexible polymer layer, and an edge region of a surface of the substrate facing away from the display region is provided with an LLO laser absorption region.

In the invention, the LLO laser absorption area is arranged in the edge area of one side of the substrate on the flexible display motherboard, which is far away from the display area, so that the laser energy of LLO can be properly increased when the flexible display motherboard is separated by LLO laser irradiation, the uniform carbonization and sufficient separation of the flexible polymer layer are ensured, the controllability is realized, the damage of the AA area is avoided, and the self falling of the flexible polymer layer and the substrate can be avoided.

In the invention, the LLO laser absorption area is arranged at the edge of the substrate, because the edge is a non-display area, the influence on the display area is avoided; in addition, due to the insufficiently separated edge region of the LLO laser absorbed, mechanical separation can be performed through a scraper knife, and finally complete separation of the flexible polymer layer and the whole surface of the substrate is realized by combining the LLO.

In the present invention, the LLO laser light absorption region is disposed at a distance of 5 to 50mm (e.g., 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 25mm, 28mm, 30mm, 35mm, 38mm, 40mm, 45mm, 48mm, or 50mm) from the edge of the substrate.

Preferably, the absorbing LLO laser regions are distributed in dots or stripes.

Preferably, the absorbing LLO laser regions are symmetrically distributed on the substrate.

Preferably, when the LLO laser-absorbing regions are arranged in dots, the area of the dot region is 100 μm²～1cm²E.g. 100 μm²、200μm²、500μm²、800μm²、1mm²、3mm²、5mm²、8mm²、10mm²、30mm²、50mm²、80mm²、100mm²、300mm²、500mm²、800mm²Or 1cm²。

Preferably, when the absorption LLO laser regions are distributed in stripes, the width of the stripes is 10 μm to 1cm, for example 10 μm, 30 μm, 50 μm, 80 μm, 100 μm, 300 μm, 500 μm, 800 μm, 1mm, 5mm, 10mm, 30mm, 50mm, 80mm, 100mm, 120mm, 150mm, 200mm, 250mm, 300mm, 500mm, 800mm, or 1 cm.

In the present invention, when the LLO laser absorption regions are distributed in stripes, the LLO laser absorption regions may be distributed in continuous stripes or in discontinuous stripes.

Preferably, the material for absorbing the LLO laser region is any one of or a combination of at least two of an organic glue material, a semiconductor film material, a metal material and a carbon material.

Preferably, the material for absorbing the LLO laser region is photosensitive adhesive or TiO₂Film, ZnO gel film, titanium, aluminum, chromium, graphite powder or carbon black powder, or a combination of at least two of the above materials.

Preferably, the photosensitive glue is preferably a UV glue.

Preferably, the display area includes a pixel circuit and a pixel region;

preferably, one of said flexible display motherboards comprises at least two display areas on top of the flexible polymer layer.

In the present invention, there is no particular limitation on the shape of the display area, which may be rectangular, square, circular, or other shapes.

Preferably, the substrate is a glass substrate.

Preferably, the flexible polymer layer is a Polyimide (PI) layer, a polyethylene terephthalate layer, a polyethylene naphthalate layer, a polycarbonate layer, a polyethersulfone layer, a polyacrylate layer, a polyetherimide layer, a polyamide layer, or a polyetheretherketone layer.

In the preparation process of the flexible display mother board, the LLO laser absorption area can be prepared by ink-jet printing or a common coating method (a brush, injector dispensing and the like) or by adopting a magnetron sputtering metal film.

In another aspect, the present invention provides a method for separating a substrate from a flexible display mother board, where the method includes: and irradiating the back surface of the substrate of the flexible display mother board by using LLO laser to realize uniform carbonization of the flexible polymer layer, thereby realizing the separation of the flexible polymer layer and the substrate.

In the invention, because the LLO laser absorption area exists on the flexible display mother board, the laser energy of the LLO can be properly increased during separation, the uneven carbonization of the flexible polymer layer can be avoided, the problem of insufficient separation caused by blocking the transmission of UV light due to the existence of impurities or dirt can be avoided, and the controllability is realized in the whole separation process.

Preferably, the LLO laser wavelength is in the ultraviolet region.

Preferably, the LLO laser wavelength is 308 nm.

In another aspect, the present invention provides a flexible AMOLED display panel, which is obtained by separating and removing a substrate from a flexible display motherboard as described above.

In the invention, the LLO laser absorption area is arranged on the flexible display motherboard, so that uniform carbonization of the flexible polymer layer can be fully ensured, the flexible polymer layer is fully separated from the substrate, the damage to the flexible AMOLED display panel is avoided, and the performance of the AMOLED display panel is not influenced or damaged.

In another aspect, the present invention provides a flexible display device including the flexible AMOLED display panel as described above.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the LLO laser absorption area is arranged in the edge area of one side of the substrate on the flexible display motherboard, which is far away from the display area, so that when the flexible display motherboard is separated by LLO laser irradiation, the laser energy of LLO can be properly increased, the uniform carbonization and sufficient separation of the flexible polymer layer are ensured, the controllability is realized, the damage of the display area is avoided, the flexible AMOLED display panel obtained by the flexible AMOLED display panel separated by the flexible display motherboard through laser irradiation is ensured not to be damaged, the good performance is ensured, and the application prospect is wide.

Drawings

Fig. 1 is a front view of a flexible display mother substrate in example 1, in which 1 is a glass substrate, 2 is a PI film layer, 3 is a display region, and 4 is an LLO laser absorption region.

Fig. 2 is a top view of the flexible display mother substrate in example 1, wherein 1 is a glass substrate, 3' is a virtual projection of a display region on the glass substrate, and 4 is an LLO laser absorption region.

Fig. 3 is a top view of the flexible display mother substrate in example 4, in which 1 is a glass substrate, 3' is a virtual projection of a display region on the glass substrate, and 4 is an LLO laser absorption region.

Fig. 4 is a top view of the flexible display mother substrate in example 5, in which 1 is a glass substrate, 3' is a virtual projection of a display region on the glass substrate, and 4 is an LLO laser absorption region.

Fig. 5 is a top view of the flexible display mother substrate in example 6, in which 1 is a glass substrate, 3' is a virtual projection of a display region on the glass substrate, and 4 is an LLO laser absorption region.

FIG. 6 is a top view of the mother flexible display panel of example 7, wherein 1 is a glass substrate, 3' is a virtual projection of the display region of FIG. 1 on a release substrate, and 4 is an LLO laser absorption region.

Fig. 7 is a schematic diagram of embodiment 9, in which a glass substrate 1, a PI film layer 2, a display region 3, and an LLO laser absorption region 4 are used to irradiate a flexible display mother substrate by using a laser separation technique.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.