Light-Emitting Element Display Device With Shared White Electrode
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Solution Overview
Problem
The existing light-emitting element display devices face challenges in expanding color reproduction range and improving color purity while maintaining low manufacturing costs and high aperture ratio, as adding more light-emitting elements increases the number of deposition processes, leading to higher manufacturing costs and potential deterioration in definition.
Innovation Solution
A light-emitting element display device with a configuration that includes two sub-pixels for each primary color (R, G, B) and a shared white sub-pixel, controlled by a driver circuit that calculates peak luminance and applies potentials to achieve simultaneous light emission, allowing for expanded color reproduction and improved color purity without increasing the number of deposition processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements of W, Y or other colors are added to R, G, and B light-emitting elements to expand color reproduction range and improve color purity, then color reproduction range and color purity are improved, but the number of deposition processes increases leading to increased manufacturing cost and potential deterioration in definition
Solution Approach 1:
The patent merges the white sub-pixel functionality into the existing pixel structure by sharing the common electrode among second R, second G, and second B sub-pixels. This combining approach allows the white light emission function to be integrated without adding separate deposition processes for additional color elements, thus expanding color reproduction range while avoiding increased manufacturing complexity
Solution Approach 2:
The common electrode serves multiple functions: it acts as the electrode for second R sub-pixel, second G sub-pixel, and second B sub-pixel simultaneously, and also enables white light emission when all three are activated. This multi-functionality reduces the number of electrodes and deposition processes needed, resolving the contradiction between improved color reproduction and manufacturing ease
2Manufacturing precision
If the number of light-emitting elements is increased to expand color reproduction range, then color purity is improved, but the aperture ratio may be reduced due to increased layout complexity
Solution Approach 1:
The patent combines multiple sub-pixels (first R, first G, first B, second R, second G, second B) within each pixel structure, sharing common electrodes and organizing them in a compact arrangement. This merging allows six sub-pixels to function within the area of what would traditionally be a single pixel, expanding color reproduction range while maintaining or even improving the aperture ratio by efficient space utilization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively expands the color reproduction range, improves color purity, simplifies layout, and enhances the aperture ratio, while reducing manufacturing costs and eliminating motion blur.
Implementation Method 1
a light-emitting element display panel that displays an image by light emission of light-emitting regions of a plurality of sub-pixels arranged in each of pixels in a display region, controlled by a driver circuit
Data Source
AI summary
A light-emitting element display device includes a light-emitting element display panel that displays an image by light emission of light-emitting regions of a plurality of sub-pixels. Each of the pixels includes a first R sub-pixel, a second R sub-pixel, a first G sub-pixel, a second G sub-pixel, a first B sub-pixel and a second B sub-pixel. The second R sub-pixel, the second G sub-pixel, and the second B sub-pixel include a W electrode as a common electrode that causes the second R sub-pixel, the second G sub-pixel, and the second B sub-pixel to simultaneously emit lights in response to the application of a potential. The driver circuit includes a sub-pixel control unit that calculates a peak luminance in a screen based on the video signal and controls the plurality of sub-pixels based on the peak luminance.