Display device

Patent metadata

Field	Value
Publication number	US-9275575-B2
Application number	US-201414532053-A
Country	US
Kind code	B2
Filing date	Nov 4, 2014
Priority date	Nov 6, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

When a previously existing technique is applied to a white OLED, such a structure is adopted that the peak wavelength of the intensity of interference is the emission peak wavelength corresponding to blue or less. However, in this case, the intensity of interference of the wavelength range corresponding to red is reduced to decrease the light emission intensity of red. A display device is configured in which a stacked film configuring a white light emitting element (an organic light-emitting diode element) is configured in such a manner that the peak wavelength of the intensity of interference is the peak wavelength of the light emission intensity corresponding to blue or less. The light emission intensity of the light emitting element corresponding to a red pixel is made greater than the light emission intensity of the light emitting elements corresponding to pixels for other colors.

First claim

What is claimed is:

1. A display device comprising a pixel including:
a light emitting element;
a driver element configured to control light emission of the light emitting element;
a control element configured to control the driver element;
a storage capacitor; and
a pixel capacitor,
wherein: a plurality of the pixels is formed in a matrix configuration;
the plurality of the pixels includes a plurality of red pixels;
the light emitting element is a white organic light-emitting diode element;
a stacked film configuring the light emitting element is configured to have a wavelength in which a peak wavelength of an intensity of interference is shorter than a wavelength range corresponding to red, and
a light emission intensity of the light emitting element corresponding to the red pixel is made greater than light emission intensities of the light emitting elements corresponding to pixels for other colors.

2. The display device according to claim 1 , wherein the stacked film is configured to have a peak wavelength of an intensity of interference at a peak wavelength of a light emission intensity corresponding to blue or less.

3. The display device according to claim 1 ,
wherein when a wavelength at which an intensity of interference in light emitted from a light emitting layer configuring the light emitting element takes a maximum value at a viewing angle of zero degree is defined as λimax, a wavelength at which an intensity of interference takes a minimum value is defined as λimin, and a shortest wavelength at which an intensity of light emitted from the light emitting layer takes a maximum value is defined as λemax, relationships are satisfied:
λ e max−50 nm≦λ i max<λ e max

λ e max+200 nm≦λ i min.

4. The display device according to claim 1 , wherein a maximum value of an electric current enabled to be carried through the light emitting element corresponding to the red pixel is made greater than a maximum value of an electric current enabled to be carried through the light emitting elements corresponding to pixels for other colors.

5. The display device according to claim 4 ,
wherein: the plurality of the pixels includes a plurality of green pixels, a plurality of blue pixels, and a plurality of white pixels as well as the plurality of red pixels; and
when a channel width of a thin film transistor configuring the driver element of the red pixel is defined as W R , a channel length is defined as L R , a channel width of a thin film transistor configuring the driver element of the green pixel is defined as W G , a channel length is defined as L G , a channel width of a thin film transistor configuring the driver element of the blue pixel is defined as W B , a channel length is defined as L B , a channel width of a thin film transistor configuring the driver element of the white pixel is defined as W W , and a channel length is defined as L W , relationships are satisfied:
W R /L R >W G /L G
W R /L R >W B /L B
W R /L R >W W /L W .

6. The display device according to claim 4 ,
wherein: the plurality of the pixels includes a plurality of green pixels, a plurality of blue pixels, and a plurality of white pixels as well as the plurality of red pixels; and
when a storage capacitance of the red pixel is defined as C1 R , a pixel capacitance is defined as C2 R , a storage capacitance of the green pixel is defined as C1 G , a pixel capacitance is defined as C2 G , a storage capacitance of the blue pixel is defined as C1 B , a pixel capacitance is defined as C2 B , a storage capacitance of the white pixel is defined as C1 W , and a pixel capacitance is defined as C2 W , relationships are satisfied:
C 1 R /( C 1 R +C 2 R )< C 1 G /( C 1 G +C 2 G )
C 1 R /( C 1 R +C 2 R )< C 1 B /( C 1 B +C 2 B )
C 1 R /( C 1 R +C 2 R )< C 1 W /( C 1 W +C 2 W ).

7. The display device according to claim 1 , wherein light is extracted from an opposite side of a substrate on which the light emitting element is formed.

8. The display device according to claim 1 , wherein a light emission area of the light emitting element corresponding to the red pixel is made greater than light emission areas of the light emitting elements' corresponding to pixels for other colors.

9. The display device according to claim 8 ,
wherein: the plurality of the pixels includes a plurality of green pixels, a plurality of blue pixels, and a plurality of white pixels as well as the plurality of red pixels, and
when light emission areas of the pixels defined by an insulating film formed on a peripheral part of an electrode configuring the organic light-emitting diode element are defined as AR in the red pixel, AG in the green pixel, AB in the blue pixel, and AW in the white pixel, relationships are satisfied:
AR>AG
AR>AB
AR>AW.

10. The display device according to claim 9 , wherein the electrode configuring the organic light-emitting diode element is formed on the substrate side on which the light emitting element is formed with respect to the stacked film.

11. A display device comprising a plurality of pixels, the plurality of pixels including:
a white organic light-emitting diode element;
a driver element configured to control light emission of the white organic light-emitting diode element; and
a control element configured to control the driver element,
wherein: light is extracted from an opposite side of a substrate on which the white organic light-emitting diode element is formed;
the pixels includes a plurality of red pixels;
when a wavelength at which an intensity of interference in light emitted from a light emitting layer configuring the white organic light-emitting diode element takes a maximum value at a viewing angle of zero degree is defined as λimax, a relationship λimax<600 nm is satisfied; and
a light emission intensity of the white organic light-emitting diode element corresponding to the red pixel is made greater than light emission intensities of the white organic light-emitting diode elements corresponding to pixels for other colors.

12. A display device comprising a plurality of pixels, the plurality of pixels including:
a white organic light-emitting diode element;
a driver element configured to control light emission of the white organic light-emitting diode element; and
a control element configured to control the driver element,
wherein: light is extracted from an opposite side of a substrate on which the white organic light-emitting diode element is formed;
the plurality of pixels includes a plurality of red pixels;
when a wavelength at which an intensity of interference in light emitted from a light emitting layer configuring the white organic light-emitting diode element takes a maximum value at a viewing angle of zero degree is defined as λimax, a wavelength at which an intensity of interference takes a minimum value is defined as λimin, and a wavelength at which an intensity of light emitted from the light emitting layer takes a maximum value is defined as λemax, relationships are satisfied,
λ e max−50 nm≦λ i max<λ e max

λ e max+200 nm≦λ i min; and

a light emission intensity of the white organic light-emitting diode element corresponding to the red pixel is made greater than light emission intensities of the white organic light-emitting diode elements corresponding to pixels for other colors.

13. The display device according to claim 12 , wherein a relationship λimax<600 nm is satisfied.

14. The display device according to claim 11 , wherein a maximum value of an electric current enabled to be

Assignees

• Japan Display Inc

Inventors

• Adachi Masaya

Classifications

• G09G3/3233 Primary

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

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G3/3433

  using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices (using liquid crystal devices G09G3/36; using electrochromic devices G09G3/38) · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title