RGBW Display Subpixel Design for White Balance and Brightness
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Solution Overview
Problem
Conventional RGBW display devices suffer from color distortion due to imbalanced white light output, leading to false color effects and compromised display quality, as the inclusion of a white sub-pixel disrupts the ratio among R/G/B light brightness.
Innovation Solution
The introduction of a display panel and array substrate design that incorporates red, green, and blue sub-pixels with overlapping white light emitting portions, where the first and second white color coordinates are matched by combining light from the red, green, and blue sub-pixels, ensuring optimal white balance and improved light transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white sub-pixel is added to improve light transmission rate and reduce power consumption, then the light transmission rate increases, but color distortion occurs due to imbalanced white light output
Solution Approach 1:
The patent applies local quality by differentiating the treatment of color sub-pixels versus white sub-pixels. Color sub-pixels use color conversion layers with specific spectral characteristics while white sub-pixels use different structures, allowing each type to be optimized for its specific function while maintaining overall color balance
Solution Approach 2:
The patent changes parameters by adjusting the spectral power distribution of the backlight and optimizing the spectral characteristics of color conversion materials. By controlling the intensity ratios of different wavelength components and tuning the emission spectra of quantum dots or phosphors, the system achieves accurate color balance despite the presence of white sub-pixels
2Manufacturing precision
If color filters are used to achieve accurate color reproduction, then color accuracy improves, but light transmission rate decreases
Solution Approach 1:
The patent replaces traditional color filter mechanisms with quantum dot-based color conversion layers. Instead of using absorptive color filters that block unwanted wavelengths, the system uses photoluminescent quantum dots that convert broad-spectrum backlight into narrow-band emission, achieving superior color purity with higher transmission efficiency
Solution Approach 2:
The patent employs composite material structures combining quantum dots, phosphors, and selective transparent conductive oxides in multi-layer configurations. These composite layers work synergistically to achieve both high color saturation and high light transmission by optimizing the spectral transmission characteristics at each layer
Data Source
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AI summary
A display panel comprises an array of pixel units(210a), each pixel unit(210a) comprising a red sub-pixel(R), a green sub-pixel(G), and a blue sub-pixel(B); the red sub-pixel(R) comprises a red light emitting portion; the green sub-pixel comprises a green light emitting portion; and the blue sub-pixel comprises a blue light emitting portion; at least one of the red sub-pixel(R), the green sub-pixel(G), and the blue sub-pixel(B) comprises a white light emitting portion(213) for enhancing brightness of the at least one sub-pixel. A first white color coordinate and a second white color coordinate are substantially the same. The first white color coordinate is a white color coordinate of combined light of light emitted from the red sub-pixel(R), the green sub-pixel(G), and the blue sub-pixel(B). The second white color coordinate is a white color coordinate of combined light of light emitted from equal area units of the red light emitting portion, the green light emitting portion, and the blue light emitting portion.