Flexible display panel and manufacturing method thereof

1. A flexible display panel comprising a display region and a non-display region, wherein a part of the flexible display panel disposed in the non-display region comprises a flexible substrate, a multi-barrier layer, and a planarization layer, and

wherein a thin film transistor (TFT) array layer is formed on the multi-barrier layer and the TFT array layer is disposed on the display region;

wherein a cutting track is defined at a peripheral edge of the non-display region, a groove is defined in the cutting track, and an end of the planarization layer extends to at least an interface formed between the multi-barrier layer and the flexible substrate through a sidewall of the groove; and

wherein layers of the flexible display panel corresponding to a position of the groove defined in the cutting track are free of an inorganic layer; and

wherein the groove is defined in the multi-barrier layer, the groove penetrates the multi-barrier layer and a part of the flexible substrate, the groove exposes a portion of a side surface of the flexible substrate, and the planarization layer covers the portion of the side surface of the flexible substrate; and

wherein a depth of the groove is greater than the thickness of the multi-barrier layer.

2. The flexible display panel according to claim 1 , wherein the groove is rectangular, and a width of the groove ranges from 3 um to 25 um.

3. The flexible display panel according to claim 1 , wherein material of the flexible substrate comprises polyimide, and material of the planarization layer comprises an organic photoresist.

4. The flexible display panel according to claim 1 , wherein the multi-barrier layer is multiple layers of laminated inorganic film layers, and material of each of the inorganic film layers comprises one or a combination of alumina, zinc oxide, titanium oxide, silicon dioxide, and zirconia.

5. The flexible display panel according to claim 1 , wherein a thickness of the multi-barrier layer ranges from 1 um to 2 um, and a thickness of the planarization layer ranges from 1 um to 10 um.

6. A method of manufacturing a flexible display panel comprising a display region, a non-display region, and a cutting track defined at a peripheral edge of the non-display region, wherein the method comprises following steps:

S 10 , forming a multi-barrier layer on a flexible substrate, wherein the cutting track is defined in the multi-barrier layer;

S 20 , forming a thin film transistor (TFT) array layer on the multi-barrier layer, wherein the TFT array layer is disposed on the display region;

S 30 , forming a groove on a part of the multi-barrier layer corresponding to a position of the cutting track, wherein the groove penetrates the multi-barrier layer and a part of the flexible substrate, and wherein layers of the flexible display panel corresponding to a position of the groove defined in the cutting track are free of an inorganic layer, and the groove exposes a portion of a side surface of the flexible substrate; and

S 40 , forming a planarization layer on the multi-barrier layer, wherein the planarization layer completely covers the TFT array layer, and an end of the planarization layer extends to at least an interface formed between the multi-barrier layer and the flexible substrate through a sidewall of the groove, and the planarization layer covers the portion of the side surface of the flexible substrate; and

wherein a depth of the groove is greater than the thickness of the multi-barrier layer.

7. The method of manufacturing the flexible display panel according to claim 6 , wherein in the step S 10 , the multi-barrier layer is multiple layers of laminated inorganic film layers, and material of each of the inorganic film layers comprises one or a combination of alumina, zinc oxide, titanium oxide, silicon dioxide, and zirconia.

8. The method of manufacturing the flexible display panel according to claim 6 , wherein in the step S 30 , the groove is rectangular, and a width of the groove ranges from 3 um to 25 um.

9. The method of manufacturing the flexible display panel according to claim 6 , wherein material of the flexible substrate is polyimide, material of the multi-barrier layer is silicon dioxide, and material of the planarization layer is an organic photoresist.