Display panel and display panel manufacturing method
A display panel including a power supplying auxiliary electrode above the substrate in at least one gap among gaps between pixel electrodes in row and column directions, not in contact with the pixel electrodes, extending in the row and/or column direction. An intermediate layer is on or above light-emitting layers and the auxiliary electrode, and includes a fluoride of an alkali metal or an alkaline earth metal. A functional layer is on or above the intermediate layer, and includes an organic material that facilitates electron transport and/or facilitates electron injection and a rare earth metal dopant. A counter electrode is on or above the functional layer. Further, 1≤x≤3, 20≤y≤40, and y≥10x+10, where x is film thickness of the intermediate layer in nanometers, and y is percentage by weight of the rare earth metal dopant in the functional layer.
1. A display panel in which pixel electrodes are arranged in a matrix of rows and columns above a substrate and a light-emitting layer is disposed on or above each of the pixel electrodes, the display panel comprising:
a power supplying auxiliary electrode disposed above the substrate in at least one gap among gaps between the pixel electrodes in a row direction and a column direction, in a non-contact state with the pixel electrodes, the power supplying auxiliary electrode extending in the row direction and/or the column direction;
an intermediate layer disposed on or above the light-emitting layers and the auxiliary electrode, the intermediate layer including a fluoride of a first metal that is an alkali metal or an alkaline earth metal;
a functional layer disposed on or above the intermediate layer, the functional layer including an organic material that has at least one of a property of facilitating electron transport and a property of facilitating electron injection and a dopant of a second metal that is a rare earth metal; and
a counter electrode disposed on or above the functional layer, wherein
1≤ x≤ 3,20≤ y≤ 40, and y≥ 10 x+ 10
where x is film thickness of the intermediate layer in nanometers, and y is percentage by weight of the second metal dopant in the functional layer.
2. The display panel of claim 1 , wherein the first metal is Na.
3. The display panel of claim 1 , wherein the second metal is Yb.
4. The display panel of claim 1 , wherein the pixel electrodes and the power supplying auxiliary electrode are made of the same material.
5. The display panel of claim 1 , wherein a proportion of the second metal to the organic material in the functional layer increases continuously with increasing proximity to the counter electrode.
6. The display panel of claim 1 , wherein
the functional layer includes a first sublayer disposed on the intermediate layer and a second sublayer disposed on the first sublayer, and
a proportion of the second metal to the organic material in the second sublayer is greater than a proportion of the second metal to the organic material in the first sublayer.
7. The display panel of claim 1 , wherein
the functional layer is a stack of a first sublayer, a second sublayer, and a third sublayer in this order of increasing distance from the intermediate layer, and D 2 <D 1 ≤D 3 , where D 1 , D 2 , and D 3 are proportions of the second metal to the organic material in the first sublayer, the second sublayer, and the third sublayer, respectively.
8. The display panel of claim 1 , wherein a light-transmissive electrically conductive film is disposed between the functional layer and the counter electrode.
9. The display panel of claim 1 , wherein the light-emitting layers are separated by banks that extend in the column direction between the pixel electrodes that are adjacent in the row direction.
10. The display panel of claim 1 , wherein the display panel is a top-emission type of display panel.