Display Device Signal Processing for White Sub-Pixel Luminance Control
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Solution Overview
Problem
Display devices with high resolution suffer from reduced aperture ratio, leading to increased power consumption due to higher backlight luminance, and the introduction of a white sub-pixel can result in visual artifacts like dark streaks or dots when not fully lit, deteriorating image quality.
Innovation Solution
A display device with a signal processing unit that converts input signals into an extended color space, using an expansion coefficient to generate output signals for sub-pixels, including a white sub-pixel with higher luminance, to maintain image quality and reduce power consumption by adjusting the luminance of the backlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution is increased, then image quality is improved, but aperture ratio is reduced and power consumption increases
Solution Approach 1:
The pixel is segmented into multiple sub-pixels (red, green, blue, and white sub-pixels), allowing each sub-pixel to contribute differently to the overall luminance. The white sub-pixel provides high luminance with low power consumption, enabling high resolution display while reducing total power consumption compared to traditional RGB-only structures.
2Use of energy by moving object
If luminance of white sub-pixel is reduced, then power consumption is lowered, but image quality deteriorates due to dark streaks or dots
Solution Approach 1:
The luminance of the white sub-pixel is dynamically adjusted based on the luminance values of adjacent pixels. When adjacent pixels have high luminance, the white sub-pixel's luminance is increased to prevent dark streaks or dots. This dynamic adjustment maintains image quality while optimizing power consumption by not always operating at maximum luminance.
Solution Approach 2:
The control circuit receives luminance information from adjacent pixels and uses this feedback to adjust the white sub-pixel's luminance accordingly. This feedback mechanism ensures that the white sub-pixel's luminance is optimized to prevent visual artifacts while minimizing power consumption.
Data Source
AI summary
According to an aspect, a display device includes an image display panel in which pixels each including first to fourth sub-pixels are arranged in a two-dimensional matrix; and a signal processing unit that converts an input signal into an output signal and outputs the generated output signal to the image display panel. The signal processing unit determines an expansion coefficient, obtains a generated signal of the fourth sub-pixel in each pixel based on input signals of the first to the third sub-pixels in the pixel itself and the expansion coefficient, obtains an output signal for the fourth sub-pixel in each pixel based on a generated signal of the fourth sub-pixel in the pixel itself and a generated signal of the fourth sub-pixel in an adjacent pixel to be output to the fourth sub-pixel.