OLED DISPLAY WITH REDUCED POWER CONSUMPTION

• US 20130249377A1
• Filed: 05/20/2013
• Published: 09/26/2013
• 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
• Granted Patent: US 9,347,647 B2
• Time in Patent Office: Days
• US Class Current: 313/112
• 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. An OLED display with reduced power consumption including a plurality of pixels, each pixel including:

i) a white-light emitting layer;

ii) red, green and blue color filters for transmitting light corresponding to red, green and blue gamut-defining emitters, each emitter having respective chromaticity coordinates, wherein the chromaticity coordinates of the red, green and blue emitters together define a display gamut;

iii) a magenta color filter and two of cyan, yellow or no color filters for filtering light corresponding to magenta and correspondingly two of cyan, yellow or white additional within-gamut emitters having chromaticity coordinates within the display gamut, wherein the magenta and two of the cyan, yellow or white emitters form an additional color gamut, each additional emitter has a corresponding radiant efficiency, and wherein the radiant efficiency of each additional emitter is greater than the radiant efficiency of each of the gamut-defining emitters;

iv) the red, green, blue, magenta and an additional two of the cyan, yellow or white emitters are six subpixels of a single pixel; and

comprising;

a. means to receive a three-component input image signal;

b. means to transforming the three-component input image signal to a six-component drive signal; and

c. means to providing the six components of the drive signal to respective emitters of the OLED display to display an image corresponding to the input image signal whereby there is a reduction in power.

2. The OLED display of claim 1 wherein the six subpixels are red, green, blue, cyan, magenta and yellow emitters.

3. The OLED display of claim 1 wherein the red and cyan subpixels are adjacent or the magenta and green subpixels are adjacent or the vlue and yellow subpixels are adjacent.

4. The OLED display of claim 2 in which the arrangement of subpixels within a single pixel is inverted in an adjacent pixel.

5. The OLED display of claim 4 in which one pixel has a first row of red, green and blue subpixels and a second row of cyan, magenta and yellow subpixels and an adjacent pixel has a first row of cyan, magenta and yellow subpixels and a second row of red, green and blue subpixels.

6. The OLED display of claim 2, wherein the display additionally has a white point with defined chromaticity coordinates and wherein the chromaticity coordinates of the cyan, magenta and yellow emitters form a triangle that includes the chromaticity coordinates of the defined white point.

7. The OLED display of claim 2, wherein the color filters for the gamut-defining emitters are formed from combinations of the color filters of the within-gamut emitters.

8. The OLED display of claim 1 where one of the subpixels is white.

9. The OLED display of claim 6 where the white subpixel has a CIE coordinate equal to or greater than 0.3128 and a CIE_y coordinate equal to or greater than 0.3292.

10. The OLED display of claim 6 wherein the six subpixels are red, green, blue, white, magenta and yellow emitters.

11. The OLED display of claim 6 wherein the subpixels are red, green, blue, cyan, magenta and white subpixels.

12. The OLED display of claim 1 in which the arrangement of subpixels within a pixel are geometrically transformed in different pixels.

13. The OLED display of claim 1, wherein step b) includes transforming the three-component input signals such that input signals corresponding to chromaticity coordinates within the additional gamut are reproduced using the additional emitters.

14. The OLED display of claim 1, wherein step b) includes transforming the three-component input signals such that input signals corresponding to chromaticity coordinates within the additional gamut are reproduced using only the additional emitters.

15. The OLED display of claim 1, wherein step b) includes transforming the three-component input signals such that input signals corresponding to chromaticity coordinates within the display gamut but outside the additional gamut are reproduced using combinations of the gamut-defining and additional emitters.

16. The OLED display of claim 1, wherein step b) includes transforming the three-component input signals such that input signals corresponding to chromaticity coordinates inside the display gamut but outside the additional gamut are reproduced using combinations of one of the gamut-defining and two of the additional emitters.

17. The OLED display of claim 1, wherein the display additionally has a white point with defined chromaticity coordinates and wherein the luminance at the defined white point is lower when the input image signal contains 10% or more of pixels that are fully saturated than when less than 1% or less of the pixels are saturated.