Electroluminescence display device
View Patent ↗There is provided an EL display device of a color filter system which obtains sufficient brightness and contrast while making it difficult to generate a color mixture even if pixels become fine. An EL display device 100 according to the present invention includes a first substrate 1 , a circuit layer 2 formed on the first substrate 1 , a color selection reflection layer 11 formed in an upper layer of the circuit layer 2 , lower electrodes 5 formed in an upper layer of the color selection reflection layer 11 , a white light emission EL layer 7 formed in an upper layer of the lower electrodes 5 , an upper electrode 8 formed in an upper layer of the EL layer 7 , and a sealing layer 9 formed in an upper layer of the upper electrode 8.
1. An EL display device comprising:
a first substrate;
a circuit layer formed on the first substrate;
a color selection reflection layer formed on an upper layer of the circuit layer;
lower electrodes formed on an upper layer of the color selection reflection layer;
a white light emission EL layer formed on an upper layer of the lower electrodes;
an upper electrode formed on an upper layer of the white light emission EL layer; and
a sealing layer formed on an upper layer of the upper electrode.
2. The EL display device according to claim 1 , wherein the color selection reflection layer includes a reflection layer, and color filters formed on an upper layer of the reflection layer.
3. The EL display device according to claim 1 , wherein the color selection reflection layer includes a dichroic mirror layer.
4. The EL display device according to claim 3 , wherein a light absorbing layer is formed on a lower layer of the color selection reflection layer.
5. The EL display device according to claim 1 , wherein the upper electrode is a cathode.
6. The EL display device according to claim 1 , wherein a partial reflection film is formed on the upper layer of the upper electrode.
7. The EL display device according to claim 6 ,
wherein pixel separation films are formed to separate the adjacent lower electrodes from each other, and
wherein the partial reflection film is an auxiliary electrode disposed immediately above the pixel separation films.
8. The EL display device according to claim 1 , further comprising:
pixels on which the color selection reflection layer is formed; and
pixels of white light emission on which the color selection reflection layer are not formed.
9. The EL display device according to claim 1 , further comprising:
upper color filters arranged in the upper layer of the sealing layer; and
a second substrate having the upper color filters formed on a surface thereof.
10. The EL display device according to claim 9 , wherein a protective layer is formed between the sealing layer and the upper color filters.
11. The EL display device according to claim 1 , wherein a protective layer is formed between the color selection reflection layer and the lower electrodes.
12. The EL display device according to claim 1 , wherein a boundary between the color selection reflection layers belonging to the adjacent pixels is tapered.
13. The EL display device according to claim 1 , wherein the upper electrode is electrically connected to a line included in the circuit layer through a through-hole, and set as a common potential.
14. The EL display device according to claim 13 , wherein the through-hole is arranged in a region where the color selection reflection layer is not formed.