Patent ID: 12205497

DESCRIPTION OF EMBODIMENTS

The technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the accompanying drawings in the present disclosure. It is evident that the embodiments described are only some rather than all embodiments in the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skills in the art without any creative work shall fall within the protection scope of the present disclosure.

FIG.1ais an overhead view diagram of a flexible display panel provided by an embodiment of the present application.FIG.1bis a partial cross-sectional diagram of the flexible display panel provided by an embodiment of the present application as shown inFIG.1aalong line B1B2.FIG.1cis a partial cross-sectional diagram of the flexible display panel provided by a first embodiment of the present application as shown inFIG.1aalong line A1A2. As shown inFIG.1a,FIG.1bandFIG.1c, in a first direction x from region B to region C as shown inFIG.1a, a flexible display panel10includes a display region B and a border region adjacent to each other; the border region includes a chip region C and a bend region A, and the bend region A is located between the display region B and the chip region C. In a second direction y perpendicular to the flexible display panel and the first direction x, the flexible display panel10includes a substrate11, a base material reacting layer12and a circuit wiring13. The base material reacting layer12is located on the substrate11in the bend region A, and the circuit wiring13is located in the base material reacting layer12and obtained by at least a predetermined part of the base material reacting layer12reacted by an oxidation reduction reaction.

The material of the substrate11can be any one of glass, metal, quartz and organic matter. In one of a preferred embodiment, the substrate11is a polyimide (PI) film substrate.

The circuit wiring13refers to a trace having a function of conducting electric, such that the circuit wiring13can be used to form a functional device or as a signal transmission path.

In the flexible display panel provided by this embodiment, the circuit wiring13is obtained by a predetermined part of the base material reacting layer reacted by the oxidation reduction reaction. The circuit wiring13and the base material reacting layer12are connected together through Vander Waals force. In this way, on one hand, the adhesion between the circuit wiring13and the base material reacting layer12is reinforced and the risk of the circuit wiring13separating from the film beneath the circuit wiring13is reduced; and on another hand, the stress created during the bending process can be counteracted by Vander Waals force and the risk of the breakage of the circuit wiring can be reduced.

In an embodiment, material of the base material reacting layer12is oxide. In this situation, the base material reacting layer12can further play a buffer role, so that there is no need to dispose a buffer layer on the substrate11, that is, compared with the flexible display panel in the related art, although the flexible display panel10in this embodiment additionally comprised a base material reacting layer12, a thickness of the flexible display panel is not increased because there is no need to set a buffer layer, which meets the market demand of ultra-thin.

For example, the material of the base material reacting layer12is graphene oxide, correspondingly, the material of the circuit wiring13is graphene. In this situation, the circuit wiring13of graphene can be obtained by a positioning irradiation of a laser to the base material reacting layer12with a mask plate holding a predetermined circuit pattern. Using graphene as a circuit wiring13can further reduce the risk of wire breakage due to its excellent electrical conductivity and flexibility.

As shown inFIG.1b, in this embodiment, the base material reacting layer12includes a first surface S1away from the substrate11, and the circuit wiring13includes a second surface S2not covered by the base material reacting layer. The second surface S2is flush with the first surface S1, that is, the first surface S1and the second surface S2are coplanar. In this way, it is equivalent to choosing the top layer of the base material reacting layer12to prepare the circuit wiring13. Compared with choosing the middle layer of the base material reacting layer12or the bottom layer adjacent to the substrate11to prepare the circuit wiring13, the preparation process is simpler and the realization in industry is more conducive.

FIG.2is a partial cross-sectional diagram of the flexible display panel provided by a second embodiment of the present application as shown inFIG.1aalong line A1A2. Compared with the flexible display panel10shown inFIG.1c, the only difference is that the flexible display panel20shown inFIG.2further includes a protective layer24covering the first surface S1and the second surface S2. The material of the protective layer24and the material of the base material reacting layer22are the same.

The material of the protective layer24and the material of the base material reacting layer22are the same, which means the physical property of the protective layer24and the physical property of the base material reacting layer22are the same. In this case, compared with the adjacent films with different physical properties, the adjacent films with the same physical property have better adhesion, so that film separation is not easy to occur between the protective layer24and the base material reacting layer22. Therefore, the risk of film separation between the circuit wiring23and the protective layer24above the circuit wiring23is reduced.

In an embodiment, the material of the protective layer24is oxide. In this situation, the protective layer24can also play an insulation role, so there is no need to set an insulating layer on the circuit wiring23, that is, compared with the flexible display panel in the prior art, although the flexible display panel in this embodiment additionally comprises a protective layer24, a thickness of the flexible display panel is not increased because there is no need to dispose an insulating layer, which meets the market demand of ultra-thin.

FIG.3is a partial cross-sectional diagram of the flexible display panel provided by a third embodiment of the present application as shown inFIG.1aalong line A1A2. Compared with the flexible display panel20shown inFIG.2, the difference is that a circuit wiring33of a flexible display panel30shown inFIG.333includes a connecting segment331and a lead-out segment332electrically connected to the connecting segment331. The connecting segment331is parallel to the substrate31, and the lead-out segment332is perpendicular to the substrate31.

The connecting segment331of the circuit wiring33is used as a current path, and the lead-out segment332is used to electrically connect the circuit wiring33with other circuit structures and plays a role as a wiring terminal.

In the flexible display panel30provided by this embodiment, the wiring terminal (that is, the lead-out segment332) of the circuit wiring33is also obtained by a predetermined part of the base material reacting layer32reacted by the oxidation reduction reaction. In this way, compared with the prior art of etching the hole and then filling the hole with metal to get the wiring terminal, on one hand, the preparation process is greatly simplified; and on another hand, the film separation is not easy to occur because of the more powerful bonding force between the lead-out segment332and the base material reacting layer32around the lead-out segment332.

As shown inFIG.3, the flexible display panel30includes at least one pixel drive circuit35in the display region B and at least one drive chip36in the chip region C. The lead-out segment332includes a first lead-out wire and a second lead-out wire, the first lead-out wire is connected to the pixel drive circuit35, and the second lead-out wire is connected to the drive chip36.FIG.3illustrates only a part of the pixel driver circuit35and a part of the drive chip36, for example, showing a section of each lead-out wire respectively.

The drive chip36is used to output a drive signal. The drive signal is transmitted into the pixel drive circuit35through the circuit wiring33. The pixel drive circuit35is charged under an action of the drive signal to control the corresponding sub-pixel light.

In the flexible display panel provided according to this embodiment, the bend region A is located between the display region B and the chip region C. In this situation, a narrow border is realized by fixing the chip region C of the flexible display panel in the non-display surface of the display region B through bending the bend region A.

At least one stress release structure may be disposed in the circuit wiring according to any one of the embodiments mentioned above, specifically, the connecting segment331comprises at least one stress release structure.

For example,FIG.4ais a partial overhead view of a circuit wiring provided in the first embodiment of the present application. As shown inFIG.4a, in this embodiment, a connecting segment433of the circuit wiring includes a symmetry axis L parallel to an extending direction of the connecting segment433and two edge wires4331symmetric about the symmetry axis L. Each of the edge wires4331is a structure with a plurality of curves and a plurality of wiring segments connected alternatively. Specifically, as shown inFIG.4a, the edge wires4331include plurality of semicircular curves, each two adjacent semicircular curves are connected through a wiring segment. In this way, compared with the circuit wiring having straight edge wires, a length of the edge wire is extended, the ability to disperse the bending stress is enhanced so as to further reduce the risk of circuit breakage.

For another example,FIG.4bis an overhead view of a circuit wiring provided in the second embodiment of the present application. As shown inFIG.4b, in this embodiment, the connecting segment434of the circuit wiring includes a through-hole4341running through the connecting segment434in a thickness direction of the connecting segment434. In this way, stress can be released by the deformation of the through-hole during the bending of the connecting segment434. The preparation process of the through-hole may include: shading the through-hole when preparing the circuit wiring, which means the oxidation reduction reaction is not carried out at the through-hole.

For example,FIG.4cis an overhead view diagram of a circuit wiring provided in the third embodiment of the present application, compared with the circuit wiring shown inFIG.1c, the only difference is that, in a direction parallel the substrate11, the shape of the connecting segment435of the circuit wiring shown inFIG.4cis a serpentine curve, such as a square waveform or a wavy shape.FIG.4dis a cross-sectional diagram of a circuit wiring provided in the fourth embodiment of the present application, compared with the circuit wiring inFIG.1c, the only difference is that, in the second direction y perpendicular to the substrate41, the connecting segment436of the circuit wiring shown inFIG.4dis in a shape of curve.

In this way, the length of the circuit wiring is increased, and the ability to disperse the bending stress is enhanced, thus the breakage risk of the circuit wiring can be further reduced.

In addition, it should be noted that the circuit wiring in the bend region A cannot be designed as a curve in the prior art, due to the problems of film separation and wire broken existing in the prior art when obtaining the circuit wiring through etching the metal layer, the risks of film separation and wire broken will be further increased when the circuit wiring is in a curve shape as mentioned above. In this embodiment of the present application, the circuit wiring is obtained by a predetermined part of the base material reacting layer reacted by the oxidation reduction reaction, such that the adhesion between the circuit circuiting and its adjacent film layer is stronger, which reduce the risks of film separation and wire breaking, therefore the circuit wiring in the bend region A can be designed in the curved shape as mentioned above.

FIG.5is a partial cross-sectional diagram of the flexible display panel provided by a fourth embodiment of the present application as shown inFIG.1aalong line A1A2. As shown inFIG.5, the base material reacting layer52includes a plurality of circuit sub-wirings arranged in a plurality of layers parallel to the substrate, and the orthographic projections of the plurality of circuit sub-wirings arranged in the plurality of layers on the substrate coincide with each other, that is, the orthographic projections of the plurality of circuit sub-wirings arranged in the plurality of layers on the substrate are overlapped.

For example, as shown inFIG.5, the base material reacting layer52includes a first layer of circuit sub-wiring531and a second layer of circuit sub-wiring532. The orthographic projection of the first layer of circuit sub-wiring531on the substrate51and the orthographic projection of the second layer of circuit sub-wiring532on the substrate51coincide with each other, that is, the orthographic projection of the first layer of circuit sub-wiring531on the substrate51and the orthographic projection of the second layer of circuit sub-wiring532on the substrate51are overlapped.

The area of the circuit wiring occupied on the surface which is parallel to the substrate51can be saved by disposing a plurality of circuit sub-wirings in a plurality of layers parallel to the substrate51in the base material reacting layer52, which is beneficial to the requirements of product miniaturization.

FIG.6is a partial cross-sectional diagram of the flexible display panel provided by a fifth embodiment of the present application as shown inFIG.1aalong line A1A2. As shown inFIG.6, compared with the flexible display panel30shown inFIG.3, the only difference is that the flexible display panel60shown inFIG.6further includes a buffer layer67located between a substrate61and a base material reacting layer62; and/or the flexible display panel60shown inFIG.6further includes an insulating layer68located on a side of the base material reacting layer62away from the substrate61.

Specifically, as shown inFIG.6, the flexible display panel60includes the substrate61, the buffer layer67stacked on the substrate61, a structure of wiring600, at least one pixel drive circuit65and at least one drive chip66stacked on the buffer layer67, and the insulating layer68stacked on the structure of wiring600, the at least one pixel drive circuit65and the at least one drive chip66. The structure of wiring600includes the base material reacting layer62, the circuit wiring63and a protection layer64are sequentially stacked from the top to the bottom.

The buffer layer67has a buffering effect. For example, the material of the buffer layer67can be, silicon nitride, silicon oxide, alumina or the like. The insulating layer68has an electrical isolation function, for example, the material of the insulating layer68can be silicon nitride, silicon oxide or the like.

The flexible display panel according to the present application can further improve the buffer effect through setting the buffer layer separately and can further improve the insulation effect through setting the insulating layer separately.

This embodiment further provides a curved display screen, the curved display screen includes the flexible display panels provided by any one of the embodiments mentioned above, and has the corresponding technical effect with the flexible display panel.

What described above are merely preferred embodiments of the present application, and are not to limit the present application, and any modification, equivalent and so on within the spirit and principles of the present application shall be covered in the protective scope of the present application.