Alternating RGB and RBW Sub-Pixel Display for Power Efficiency
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Solution Overview
Problem
Current display technologies face challenges in reducing power consumption while maintaining high image quality, particularly in organic EL displays where the number of sub-pixels and their arrangement significantly impact both power usage and image degradation.
Innovation Solution
The proposed solution involves a display device with a specific arrangement of sub-pixels on a substrate, including subsets of red, green, blue, and white sub-pixels, where the number of red and blue sub-pixels is reduced, and their resolutions are lowered compared to green and white sub-pixels, with alternating patterns in both column and row directions, and an image signal processing section that generates modified luminance data to drive the pixels efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sub-pixels is increased to improve image quality, then image quality is improved, but power consumption increases
Solution Approach 1:
The display pixels are segmented into two subsets with different sub-pixel compositions. First subset pixels have RGB sub-pixels while second subset pixels have RBW sub-pixels. This segmentation allows the display to achieve high image quality through the white sub-pixel's high luminance while reducing overall power consumption by alternating between different sub-pixel configurations, preventing any single pixel type from consuming excessive power continuously.
Solution Approach 2:
Different regions of the display (first subset vs. second subset pixels) have different local qualities in terms of sub-pixel composition. The white sub-pixels in the second subset provide enhanced luminance for specific regions, while the first subset provides standard color reproduction. This local differentiation allows the display to optimize both image quality and power consumption in different areas simultaneously.
2Reliability
If the drive frequency is increased to reduce image degradation, then image degradation is reduced, but power consumption increases
Solution Approach 1:
The display employs periodic action by alternating between first subset pixels (RGB) and second subset pixels (RBW) in a systematic pattern across the display array. This periodic arrangement allows the white sub-pixels to be activated periodically rather than continuously in all pixels, reducing the average drive frequency requirements and associated power consumption while still maintaining image quality through the high luminance contribution of white sub-pixels during their activation periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces power consumption and minimizes image quality degradation by optimizing the number and arrangement of sub-pixels, enhancing the opening ratio and reducing current density in the light-emitting layer, thereby improving the display's longevity and visual performance.
Implementation Method 1
a display using a current-driven optical device in which light-emission luminance varies depending on a value of a current flown therethrough as a light-emitting device, for example, an organic EL (Electro Luminescence) display using an organic EL device
Data Source
AI summary
A display device includes pixels, each including a set of sub-pixels. A first subset of the pixels may each include white, green, and blue sub-pixels, but not a red sub-pixel. A second subset of the pixels may each include white, green, and red sub-pixels, but not a blue sub-pixel. The pixels may alternate between the first subset and the second subset in at least one direction. First luminance data may be extracted from an input image signal based on a map that specifies locations of pixels of the first subset, and second luminance data may be extracted from the input image signal based on a map that specifies locations of pixels of the second subset. The display device may drive the blue sub-pixels based on the first luminance data and drive the red sub-pixels based on the second luminance data.