Display Device Signal Processing for RGBW Sub-pixel Brightness
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Solution Overview
Problem
Display devices with increased resolution suffer from reduced aperture ratio and higher power consumption due to increased backlight luminance, and existing technologies can cause color deterioration through simultaneous contrast, making images appear darker due to fixed extension coefficients for colors with different hues.
Innovation Solution
A display device with a signal processing unit that converts input signals into extended values in a color space including red, green, blue, and white sub-pixels, determining an extension coefficient to generate output signals for each sub-pixel and a correction value based on hue, to prevent color deterioration and improve brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display device is increased, then the display quality is improved, but the aperture ratio is reduced
Solution Approach 1:
The patent merges the white pixel functionality into the existing red, green, and blue sub-pixels by treating the white pixel as an additional color channel. This allows the display to maintain high resolution while effectively increasing the aperture ratio through the white sub-pixel contribution to light output.
Solution Approach 2:
The patent employs a composite color model combining red, green, blue, and white sub-pixels. This composite approach allows the display to achieve higher luminance without increasing backlight power, as the white sub-pixels contribute directly to the overall light output while sharing the same aperture space.
2Illumination intensity
If the luminance of the backlight is increased to achieve higher display luminance, then the display brightness is improved, but the power consumption is increased
Solution Approach 1:
The patent changes the color parameters of the sub-pixels by introducing a white sub-pixel channel. This parameter change allows the display to achieve higher luminance through the white sub-pixels rather than increasing backlight intensity, thereby reducing power consumption while maintaining or improving display brightness.
Solution Approach 2:
The patent uses a composite color system with red, green, blue, and white sub-pixels. This composite approach enables the display to reach higher luminance levels without proportionally increasing backlight power consumption, as the white sub-pixels provide efficient light output.
3Device complexity
If a fixed extension coefficient is used for colors with different hues, then the signal processing is simplified, but the color accuracy deteriorates due to simultaneous contrast
Solution Approach 1:
The patent dynamically adjusts the extension coefficient based on the specific color (hue) being displayed. Instead of using a fixed extension coefficient, the system calculates different extension coefficients for different hues (e.g., red, green, blue, white), thereby maintaining color accuracy while managing processing complexity through color-specific processing.
Solution Approach 2:
The patent applies different extension coefficients to different color channels (red, green, blue, white) based on their specific characteristics and simultaneous contrast properties. This local quality approach ensures that each color is processed with the appropriate extension coefficient to maintain color accuracy and prevent darkening.
Data Source
AI summary
According to an aspect, a display device includes an image display panel and a signal processing unit. The signal processing unit derives a generation signal for a fourth sub-pixel in each of pixels based on an input signal for a first sub-pixel, an input signal for a second sub-pixel, an input signal for a third sub-pixel, and an extension coefficient. The signal processing unit derives a correction value based on a hue of an input color corresponding to a color to be displayed based on the input signal for the first sub-pixel, the input signal for the second sub-pixel, and the input signal for the third sub-pixel. The signal processing unit derives the output signal for the fourth sub-pixel in each of the pixels based on the generation signal for the fourth sub-pixel and the correction value and outputs the output signal to the fourth sub-pixel.