RGBW Display Subpixel Control for Red Blue Life Extension
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Solution Overview
Problem
Existing display devices face challenges in enhancing display quality due to the reduction in unit pixel size, leading to a shorter operational life of red and blue sub-pixels when using RGBW construction, as they can only contain three pixels, necessitating a reduction in red or blue sub-pixels.
Innovation Solution
A display device and control method that transforms a three-color image into a four-color image, calculating decrement offsets and compensation values to generate control signals for red, green, blue, and white images, which are used to prolong the operational life of red and blue sub-pixels by adjusting image display based on gray level values, average values, light detection, and image edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the unit pixel size is decreased to enhance display quality, then the display resolution is improved, but the operational life of red and blue sub-pixels is reduced
Solution Approach 1:
The unit pixel is segmented into four sub-pixels (R, G, B, W) instead of the traditional three (R, G, B). This segmentation allows the white sub-pixel to compensate for the reduced operational life of red and blue sub-pixels by providing additional light output, thereby maintaining display quality while extending the operational life of the color sub-pixels.
Solution Approach 2:
The patent changes the parameter of sub-pixel composition by introducing a white sub-pixel with different emission characteristics. The white sub-pixel emits broad-spectrum light that can replace or supplement the red and blue sub-pixels, effectively changing the operational parameters and extending their functional life.
2Measurement precision
If the RGBW construction is used with reduced unit pixel size, then the display quality is enhanced, but the red and blue sub-pixels have shorter operational life
Solution Approach 1:
The white sub-pixel acts as an intermediary that mediates between the red, green, and blue sub-pixels. It provides additional light output that can compensate for the reduced operational life of the red and blue sub-pixels, thereby maintaining display quality and reliability without requiring larger pixel sizes.
3Ease of manufacture
If only three pixels are contained in the unit pixel, then the manufacturing complexity is reduced, but the operational life of color sub-pixels is shortened
Solution Approach 1:
The white sub-pixel serves multiple functions: it provides white light output, compensates for the operational life of red and blue sub-pixels, and can replace either red or blue sub-pixels when needed. This multi-functionality allows the unit pixel to maintain reliability and operational life while keeping the manufacturing process relatively simple.
Data Source
AI summary
A display device includes a color transformer and an image controller. The color transformer receives and transforms a three-color image into a four-color image. The four-color image includes a red image, a green image, a blue image, and a white image. The image controller calculates decrement offsets of the red image, the green image, and the blue image, and a compensation value of the white image. The image controller calculates gray level values of the red image, the green image, and the blue image when a value of the white image is zero. The image controller respectively calculates a red image control signal, a green image control signal, and a blue image control signal based on the gray level values and the decrement offsets, and the image controller calculates a white image control signal based on the gray level values and the compensation value of the white image.