OLED display with reduced power consumption

• US 9,595,221 B2
• Filed: 04/20/2016
• Issued: 03/14/2017
• Est. Priority Date: 03/04/2009
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Hamer, John W., Miller, Michael E., Ludwicki, John
• Primary Examiner(s): SHERMAN, STEPHEN G
• Application Number:
  US15/133,554
• Publication Number:
  US 20160247444A1
• Time in Patent Office: 328 Days
• Field of Search: 345 76- 83
• US Class Current: 1/1
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3216 using a passive matrix
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127

Abstract

An OLED display with a plurality of pixels for displaying an image having a target display white point luminance and chromaticity, each pixel including three red, green and blue gamut-defining emitters defining a display gamut and a magenta emitter with two of cyan, yellow or white emitters as three additional emitters which emit light within the display gamut; the display including a means for receiving a three-component input image signal; transforming the three-component input image signal to a six component drive signal; and providing the drive signal to display an image corresponding to the input image signal. One embodiment is where the pixels have red, green, blue, cyan, magenta and yellow colored subpixels.

Claims

1. A method for displaying an image on a color display, the color display to display an image including, for each of a plurality of pixels, three gamut-defining emitters that provide light of a predetermined color and define a display gamut and three additional emitters that emit light at a chromaticity different from one another and define an additional gamut within the display gamut, wherein seven non-overlapping logical subgamuts are defined by permutations of the three gamut-defining emitters and the three additional emitters, the method comprising for each pixel:

a) receiving a three-component input image signal;

b) defining a first primary matrix based on the chromaticity coordinates of the three gamut-defining emitters;

c) selecting one of the seven logical non-overlapping subgamuts in which the three-component input image signal is located;

d) defining a second primary matrix based on the chromaticity coordinates of the emitters of the selected logical subgamut;

e) applying the first primary matrix to the three-component input image signal to produce a first transformed drive signal;

f) applying the second primary matrix to the three-component input image signal to produce a second transformed drive signal;

g) selecting a mixing factor based on a desired trade-off of power consumption and image quality;

h) applying the mixing factor to the first transformed drive signal and the second transformed drive signal to produce a pixel drive signal; and

i) providing the pixel drive signal to the respective emitters to display an image corresponding to the input image signal whereby there is a reduction in power.

2. The method of claim 1, wherein the three additional emitters respectively emit cyan, magenta and yellow light.

3. The method of claim 1, wherein one of the three additional emitters emits white light.

4. The method of claim 1, wherein the display gamut and the additional gamut have respective areas in a 1931 CIE chromaticity color diagram and the area of the additional gamut is equal to or less than half the area of the display gamut.