Display Device Fourth Sub-Pixel Saturation Adjustment
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Solution Overview
Problem
Display devices for mobile apparatuses face challenges in reducing power consumption and improving visibility under outdoor lighting conditions, as higher resolution leads to decreased aperture ratio and increased power consumption for backlight luminance.
Innovation Solution
A display device with a matrix of pixels including a first, second, third, and fourth sub-pixel, where a signal processing unit generates converted input signals by altering saturation and calculates output signals based on the brightness increase caused by the fourth sub-pixel, optimizing luminance and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution is increased, then display quality is improved, but aperture ratio is reduced and power consumption increases
Solution Approach 1:
The pixel is segmented into multiple sub-pixels (first, second, third, and fourth sub-pixels) that display different color components. This segmentation allows independent control of each sub-pixel, enabling the fourth sub-pixel to compensate for reduced aperture ratio by providing additional luminance contribution, thereby maintaining display quality while managing power consumption in high-resolution displays
Solution Approach 2:
The signal processing unit changes the saturation parameter of input signals when generating converted input signals for the fourth sub-pixel. By adjusting saturation and calculating output signals based on the amount of increase in brightness caused by the fourth sub-pixel, the system optimizes the balance between display quality and power consumption in high-resolution displays
2Illumination intensity
If backlight luminance is increased, then luminance is improved, but power consumption increases
Solution Approach 1:
The fourth sub-pixel is merged with the first, second, and third sub-pixels to form a complete pixel structure. This merging allows the fourth sub-pixel to contribute additional luminance output, enabling the display to achieve high luminance levels without requiring increased backlight intensity, thereby reducing power consumption while maintaining or improving luminance performance
Solution Approach 2:
The signal processing unit adjusts the saturation parameter of input signals and calculates output signals based on the brightness increase caused by the fourth sub-pixel. This parameter change approach enables precise control of luminance output from the fourth sub-pixel, allowing the system to achieve desired luminance levels efficiently without over-driving the backlight, thus optimizing power consumption
3Illumination intensity
If the fourth sub-pixel is added, then luminance is enhanced, but device complexity increases
Solution Approach 1:
The pixel is divided into four distinct sub-pixels, each responsible for displaying a specific color component. This segmentation approach, while increasing structural complexity, enables the fourth sub-pixel to provide additional luminance output that compensates for the complexity introduced, as each sub-pixel can be controlled independently to achieve the desired luminance enhancement
Solution Approach 2:
The signal processing unit implements parameter changes by adjusting saturation and calculating output signals based on brightness increase from the fourth sub-pixel. This software-based parameter control approach manages the complexity of the four-sub-pixel structure by providing a systematic method for coordinating the output of all sub-pixels, thereby achieving luminance enhancement while maintaining manageable device complexity through algorithmic control
Data Source
AI summary
A display device includes: a display unit including pixels arranged in a matrix therein, each of the pixels including a first sub-pixel that displays a first color component, a second sub-pixel that displays a second color component, a third sub-pixel that displays a third color component, and a fourth sub-pixel that displays a fourth color component; and a signal processing unit that receives input signals that are capable of being displayed with the first sub-pixel, the second sub-pixel, and the third sub-pixel, and calculates output signals to the first, second, third, and fourth sub-pixels. The signal processing unit generates converted input signals with changed saturation among the input signals. The signal processing unit calculates output signals to the first sub-pixel, the second sub-pixel, and the third sub-pixel based on the converted input signals and an amount of increase in brightness caused by the fourth sub-pixel.