Display device

Patent metadata

Field	Value
Publication number	US-9501967-B2
Application number	US-201414484316-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Sep 13, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

In a display device having a display area in which a plurality of pixels are formed to display an image, each of the plurality of pixels includes a brightness control layer that controls brightness of the pixel by light emission, and a light emission color control layer that controls a light emission color in the pixel by controlling a transmission wavelength band of a light emitted from the brightness control layer to be transmitted, and a light emission color control signal for controlling the transmission wavelength band to control the light emission color in the pixel is input to the light emission color control layer in each pixel.

First claim

What is claimed is:

1. A display device having a display area in which a plurality of pixels are formed to display an image, each of the plurality of pixels comprising:
a scanning signal line;
a bright control unit having a first transistor that controls brightness of the pixel by light emission;
a light emission color control unit having a second transistor that controls a light emission color in the pixel by controlling a transmission wavelength band of a light emitted from the brightness control unit to be transmitted,
wherein a light emission color control signal for controlling the transmission wavelength band to control the light emission color in the pixel is input to the light emission control unit in each pixel, and
the first transistor and the second transistor are electrically connected to the scanning signal line.

2. The display device according to claim 1 , further comprising: a light emission color control signal output unit that outputs the light emission color control signal,
wherein the light emission color control signal output unit outputs the light emission color control signal input to the plurality of pixels within the display area, individually, or outputs the light emission color control signal input in common to a plurality of pixels within each of partitioned areas into which the display area is partitioned.

3. The display device according to claim 2
wherein the light emission color control unit includes an organic electrochromic layer.

4. The display device according to claim 3
wherein the organic electrochromic layer is held between a first electrode layer and a second electrode layer, and the transmission wavelength band is controlled according to a signal supplied between the first electrode layer and the second electrode layer,
wherein the second electrode layer is formed in common to the plurality of pixels within the display area, and
wherein the first electrode layer is formed for each of the plurality of pixels individually in the display area.

5. The display device according to claim 4 ,
wherein the first electrode layer is connected to a signal line which is formed to extend to an outside of the display area, and transmits the light emission color control signal, through a contact hole formed outside of the display area.

6. The display device according to claim 4 ,
wherein the brightness control unit includes an organic EL layer that emits a light by organic electroluminescence, and
wherein the organic EL layer is held between the second layer and a third electrode layer formed on a side opposite to the first electrode layer across the second electrode layer, and a brightness in the pixels in controlled according to a signal supplied between the sound electrode layer and the third electrode layer.

7. The display device according to claim 4 ,
wherein the first electrode is an upper layer than the second electrode, and
the first electrode is electrically connected to the second transistor through a contact hole of the second electrode.

8. The display device according to claim 1 ,
wherein the brightness control unit has a third electrode layer formed in each of the plurality of pixels and a common electrode layer formed in common to the plurality of pixels,
the light emission color control unit includes a first electrode layer formed in each of the plurality of pixels,
the common electrode layer has a contact hole formed therein, and
the first electrode layer is an upper layer than the third electrode layer and the common electrode layer, and is connected to the second transistor though the contact hole of the common electrode layer.

Assignees

• Japan Display Inc

Inventors

• Sato Toshihiro

Classifications

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2300/0439

  Pixel structures · CPC title