Display structure with a roughened sub-electrode layer
View Patent ↗The invention relates to a display structure comprising an electrode layer ( 3 ) superposed on a sub-layer ( 5 ) wherein a surface of the sub-layer facing the electrode layer is roughened. In particular, the display structure may relate to a TFT stack comprising a layer of an electrode metal corresponding to a pixel electrode ( 3 ). The pixel pad together with the data line ( 1 ) is used for charging of the pixel pad. The gate electrode ( 4 ) used is separated from the source and drain electrode ( 1, 3 ) by a dielectric layer ( 6 ). The structural layers of the TFT may be deposited on a suitable flexible substrate ( 7 ). In order to prevent defects in the light modulating layer ( 9 ) from being visible, a surface of the sub-layer ( 5 ) underlying the electrode layer ( 3 ) is roughened. It is desirable to provide such improvement to, among others, electrophoretic-type displays and liquid crystal-type displays.
1. A display structure comprising: an electrode layer superposed on a sub-layer comprising an organic material,
wherein the sub-layer is superposed on a substrate, a surface of the sub-layer facing the electrode layer is roughened, and roughness (Ra) of the sub-layer is in a range 1<Ra<500 nm.
2. The display structure according to claim 1 , wherein the display structure comprises pixels including thin film transistor (TFT) stacks, wherein said electrode layer and said sub-layer form part of the TFT stacks.
3. The display structure according to claim 2 , wherein the TFT stacks are arranged for switching respective pixels.
4. The display structure according to claim 2 , wherein pixels comprise an electrophoretic material.
5. The display structure according to claim 1 , wherein the sub-layer is an electrical insulator layer.
6. The display structure according to claim 1 , comprising a cholesteric LC effect display effect layer.
7. The display structure according to claim 1 , adapted for forming a flexible display.
8. The display structure of claim 1 wherein the roughness (Ra) is in a range 1<Ra<50 nm.
9. An electronic apparatus comprising a display structure, the display structure comprising:
an electrode layer superposed on a sub-layer comprising an organic material,
wherein the sub-layer is superposed on a substrate, a surface of the sub-layer facing the electrode layer is roughened, and roughness (Ra) of the sub-layer is in a range 1<Ra<500 nm.
10. A method of manufacturing a display structure comprising an electrode layer superposed on a sub-layer comprising an organic material, the method comprising the steps of:
forming the sub-layer on a substrate,
roughening a surface of the sub-layer facing the electrode layer, and roughness (Ra) of the sub-layer is in a range 1<Ra<500 nm, and
depositing the electrode layer on the roughened sub-layer.
11. The method according to claim 10 , wherein etching or replication is used for roughening the sub-layer.
12. The method according to claim 10 , wherein roughness (Ra) of the sub-layer is in a range 1<Ra<50 nm.