OLED Display Sub-Pixel Color Conversion for Power Reduction
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Solution Overview
Problem
Existing display devices with self-emitting elements, such as OLEDs, face challenges in reducing power consumption while maintaining high luminance, as simple conversion methods do not effectively decrease the amount of lighting required for these elements.
Innovation Solution
A display device with a configuration of pixels including sub-pixels for red, green, blue, and an additional color component, along with a conversion processing unit that analyzes image data to adjust the color conversion rate based on predicted power consumption, shifting hues and attenuating saturation to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If simple color conversion is performed to increase screen brightness using four-color output signal, then luminance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic color conversion that adapts to local image characteristics. The conversion processing unit analyzes image data and performs color conversion selectively in different regions, using the fourth sub-pixel dynamically based on local luminance requirements rather than uniformly across the entire display
Solution Approach 2:
The patent applies different color conversion strategies to different regions of the display based on local image characteristics. By analyzing image data and identifying regions where the fourth sub-pixel would be beneficial, the system applies color conversion locally rather than globally, optimizing power consumption while maintaining brightness where needed
2Illumination intensity
If the fourth sub-pixel with higher luminance is used, then screen brightness is improved, but the amount of lighting of self-emitting elements increases
Solution Approach 1:
The patent uses the fourth sub-pixel selectively rather than universally. By performing color conversion only in regions where it provides benefit and where power consumption allows, the system achieves partial use of the high-luminance capability without the excessive power consumption that would result from universal application
3Use of energy by moving object
If color conversion rate is increased to suppress power consumption, then energy efficiency is improved, but image quality may deteriorate
Solution Approach 1:
The patent dynamically adjusts the color conversion rate based on local image characteristics and power consumption conditions. The conversion processing unit analyzes image data and determines appropriate conversion parameters selectively, maintaining image quality in regions where conversion is not needed while suppressing power consumption in regions where it is beneficial
Solution Approach 2:
The patent changes color conversion parameters (hue shifting, saturation attenuation) selectively based on local image characteristics. By adjusting these parameters dynamically rather than applying fixed conversion, the system maintains image quality while optimizing power consumption
Data Source
AI summary
The display device includes an image display unit including pixels each including first to third sub-pixels and a fourth sub-pixel for displaying an additional color component according to an amount of lighting of a self-emitting element; a conversion processing unit that performs, for all of pixels, an image analysis on first color information for display at a predetermined pixel, and if a predicted value of power consumption as a total amount of lighting of self-emitting elements is above a limit, outputs a second input signal through a color conversion process on a first input signal including the first color information at a color conversion rate associated with the predicted value; and a fourth sub-pixel signal processing unit that outputs, to the image display unit, a third input signal including third color information with converted red, green, blue, and additional color components.