OLED display with reduced power consumption

• US 9,347,647 B2
• Filed: 05/20/2013
• Issued: 05/24/2016
• 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:
  US13/897,893
• Publication Number:
  US 20130249377A1
• Time in Patent Office: 1,100 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 color OLED display with reduced power consumption, having a target white point luminance and target white point chromaticity, comprising:

a) a plurality of pixels, each pixel comprising;

i) three gamut-defining emitters defining a display gamut, wherein the gamut-defining emitters produce a peak luminance that is less than the target white point luminance, and wherein a power bus with a first bulk voltage magnitude is provided to the three gamut-defining emitters;

ii) two or more additional emitters that emit light at chromaticity coordinates different from one another and within the display gamut, wherein the radiant efficiency of each of the two or more additional emitters is greater than the radiant efficiency of each of the gamut-defining emitters, and wherein a second power bus with a second bulk voltage magnitude is provided to each of the two or more additional emitters, wherein the first bulk voltage magnitude is greater than the second bulk voltage magnitude;

b) means for receiving a three-component input image signal;

c) means for transforming the three-component input image signal to a multi-component drive signal with a total number of components equal to a total number of gamut-defining emitters and additional emitters in each of the plurality of pixels such that when a transformed image signal is reproduced on the display, its reproduced luminance value is higher than a reproduced luminance value of a display with only gamut-defining emitters; and

d) means for providing the multi-component drive signal to respective gamut-defining and additional emitters to display an image corresponding to the input image signal.

2. The color OLED display of claim 1, wherein the three gamut-defining emitters include red, green and blue emitters.

3. The color OLED display of claim 1, wherein the two or more additional emitters include two or more of cyan, magenta, yellow, and white emitters.

4. The color OLED display of claim 1, wherein the chromaticity coordinates of the additional emitters form a gamut that includes the chromaticity coordinates of the target white point.