Display Device Sub-Pixel Signal Processing for Power and Quality
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Solution Overview
Problem
Display devices with high resolution suffer from reduced aperture ratio, leading to increased power consumption for backlight luminance, and the introduction of a white pixel to enhance luminance results in visible boundaries with adjacent color pixels, deteriorating display quality.
Innovation Solution
A display device with a signal processing unit that converts input signals into an extended color space, determining an expansion coefficient and fourth sub-pixel correction value to optimize output signals for sub-pixels, including a white pixel, to maintain luminance and prevent boundary visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution is increased, then the display quality is improved, but the aperture ratio is reduced leading to increased power consumption
Solution Approach 1:
The pixel is segmented into multiple sub-pixels (red, green, blue, and white sub-pixels) that can be independently controlled. By adding a white sub-pixel to the traditional RGB structure, the display can achieve high luminance without requiring the backlight to work at maximum intensity, thus reducing power consumption while maintaining high resolution
Solution Approach 2:
The invention changes the luminance parameters by introducing a white sub-pixel with higher luminance capability. The signal processing unit adjusts the output signals to optimize the luminance of each sub-pixel, allowing the display to achieve required brightness levels with lower backlight power consumption
2Use of energy by moving object
If a white pixel is added to enhance luminance, then the power consumption is reduced, but the boundary between white pixel and adjacent color pixels becomes visible deteriorating display quality
Solution Approach 1:
The signal processing unit applies local quality adjustment by calculating a fourth sub-pixel correction value specifically for the white sub-pixel based on the input signals of the red, green, and blue sub-pixels. This correction value is used to adjust the output signal of the white sub-pixel, making its luminance adapt to the adjacent color pixels and preventing visible boundaries
Solution Approach 2:
The invention implements a feedback mechanism where the output signal of the white sub-pixel is corrected based on the input signals of the color sub-pixels. The signal processing unit continuously adjusts the white sub-pixel's output signal using the fourth sub-pixel correction value, creating a feedback loop that ensures smooth transitions and prevents visible boundaries between different pixel types
Data Source
AI summary
A display device includes: an image display panel including a plurality of pixels each including first to fourth sub-pixels; and a signal processing unit. The signal processing unit determines an expansion coefficient related to the image display panel, obtains output signals of the first to the third sub-pixels based on at least input signals of the first to the third sub-pixels and the expansion coefficient to be output to the first to the third sub-pixels respectively, obtains a fourth sub-pixel correction value as a correction value of an output signal of the fourth sub-pixel based on the input signals of the first to the third sub-pixels and the expansion coefficient, and obtains the output signal of the fourth sub-pixel based on the input signals of the first to third sub-pixels, the expansion coefficient, and the fourth sub-pixel correction value to be output to the fourth sub-pixel.