Organic light emitting diode display
View Patent ↗An OLED display includes a first substrate including a thin film transistor and an organic light emitting element and a second substrate facing the first substrate and having a gully pattern recessed on a surface facing the first substrate. By having the gully pattern on the second substrate, a mechanical strength of the OLED may be improved, and thus, the OLED may minimize the thickness without reducing the mechanical strength.
1. An organic light emitting diode (OLED) display, comprising:
a first substrate including a plurality of pixels, each pixel including at least one thin film transistor and an organic light emitting element, the organic light emitting element of each pixel including a light emitting region and a non-light emitting region; and
a second substrate facing the first substrate and having a gully pattern recessed on a surface facing the first substrate, the gully pattern including a plurality of grooves arranged on the second substrate, the plurality of grooves being between individual pixels to correspond to non-light emitting regions of the pixels.
2. The OLED display as claimed in claim 1 , wherein the grooves of the gully pattern have a stripe shape.
3. The OLED display as claimed in claim 1 , wherein the grooves of the gully pattern cross each other to form a lattice shape.
4. The OLED display as claimed in claim 1 , wherein, with respect to each pixel:
the organic light emitting element includes a first electrode, an organic emission layer, a second electrode, and a pixel defining film,
the pixel defining film has an opening that exposes the first electrode of the organic light emitting element and further defines the light emitting region and a non-opening portions defining the non-light emitting region of the organic light emitting element, and
the gully pattern is formed at a position substantially corresponding to the non-opening portions of the pixel defining film of the pixels of the first substrate.
5. The OLED display as claimed in claim 4 , wherein the non-light emitting region of the organic light emitting element of each pixel is a region of each pixel where only the second electrode is formed.
6. The OLED display as claimed in claim 4 , wherein the non-light emitting region of the organic light emitting element of each pixel is a region of each pixel where the organic emissive layer does not emit light.
7. The OLED display as claimed in claim 1 , wherein the gully pattern has a width of several micrometers (μm).
8. The OLED display as claimed in claim 1 ,
wherein the second substrate further includes a light shield layer filling the gully pattern.
9. The OLED display as claimed in claim 8 , wherein the light shield layer is an inkjet-printed layer.
10. The OLED display as claimed in claim 8 , wherein the light shield layer has a width of several micrometers (μm).
11. The OLED display as claimed in claim 8 , wherein the light shield layer is formed on a part of the second substrate corresponding to a non-light emitting region of the organic light emitting element.
12. The OLED display as claimed in claim 8 , wherein the light shield layer is formed of an opaque material, an absorbing material, or a filtering material.
13. The OLED display as claimed in claim 8 , wherein the light shield layer completely fills the gully pattern.
14. The OLED display as claimed in claim 8 , wherein the organic light emitting element is divided into a light emitting region and a non-light emitting region, and
the gully pattern corresponds to the non-light emitting region of the organic light emitting element.