Flexible substrate, method of manufacturing thereof, and display panel

1 . A flexible substrate, comprising:

a glass substrate;

a first flexible base layer disposed on the glass substrate, wherein the first flexible base layer is a first polyimide layer;

a second flexible base layer disposed on the first flexible base layer, wherein the second flexible base layer is a second polyimide layer; and

a third flexible base layer disposed on the second flexible base layer, wherein the third flexible base layer is a third polyimide layer;

wherein the first polyimide layer, the second polyimide layer, and the third polyimide layer are formed by a solvent of N-methylpyrrolidone including 2,5-bis(4-aminophenylthio)thiophene and 4,4′ bis(3,4 dicarboxyphenylthio)diphenyl sulfide dianhydride;

a molar ratio of the 2,5-bis(4-aminophenylthio)thiophene of the first polyimide layer, a molar ratio of the 2,5-bis(4-aminophenylthio)thiophene of the second polyimide layer, and a molar ratio of the 2,5-bis(4-aminophenylthio)thiophene of the third polyimide layer are gradually decreased in turn; and

refractive indexes of the first flexible base layer, the second flexible base layer, and the third flexible base layer are gradually decreased in a direction away from the glass substrate.

2 . The flexible substrate according to claim 1 , wherein the first flexible base layer has a refractive index greater than 1.52.

3 . The flexible substrate according to claim 1 , wherein a thickness of the first flexible base layer ranges from 1 μm to 100 μm.

4 . The flexible substrate according to claim 3 , wherein the thickness of the first flexible base layer ranges from 1 μm to 10 μm.

5 . The flexible substrate according to claim 1 , wherein a thickness of the second base layer ranges from 1 μm to 100 μm.

6 . The flexible substrate according to claim 5 , wherein the thickness of the second base layer ranges from 1 μm to 10 μm.

7 . The flexible substrate according to claim 1 , wherein a thickness of the third base layer ranges from 1 μm to 100 μm.

8 . The flexible substrate according to claim 7 , wherein the thickness of the third base layer ranges from 1 μm to 10 μm.

9 . A display panel, comprising:

a first flexible substrate;

a metal cathode disposed on the first flexible substrate;

a light emitting unit disposed on the metal cathode;

an organic layer disposed on the light emitting unit and the metal cathode;

a transparent electrode disposed on the organic layer; and

a second flexible substrate disposed on the transparent electrode;

wherein the first and second flexible substrates each comprise:

a glass substrate;

a first flexible base layer disposed on the glass substrate, wherein the first flexible base layer is a first polyimide layer;

a second flexible base layer disposed on the first flexible base layer, wherein the second flexible base layer is a second polyimide layer; and

a third flexible base layer disposed on the second flexible base layer, wherein the third flexible base layer is a third polyimide layer;

wherein the first polyimide layer, the second polyimide layer, and the third polyimide layer are formed by a solvent of N-methylpyrrolidone including 2,5-bis(4-aminophenylthio)thiophene and 4,4′ bis(3,4 dicarboxyphenylthio)diphenyl sulfide dianhydride;

a molar ratio of the 2,5-bis(4-aminophenylthio)thiophene of the first polyimide layer, a molar ratio of the 2,5-bis(4-aminophenylthio)thiophene of the second polyimide layer, and a molar ratio of the 2,5-bis(4-aminophenylthio)thiophene of the third polyimide layer are gradually decreased in turn; and

refractive indexes of the first flexible base layer, the second flexible base layer, and the third flexible base layer are gradually decreased in a direction away from the glass substrate.