Light-emitting Device with Shared EL Layer and Color Filters
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Solution Overview
Problem
Current light-emitting elements, particularly in display technologies, face challenges in achieving a wide color gamut and high color purity while maintaining low power consumption, especially in methods like side-by-side patterning and white-color filter methods, which often result in reduced color accuracy and increased power usage.
Innovation Solution
A light-emitting device comprising multiple light-emitting elements with EL layers emitting white light, where the optical path lengths between electrodes are adjusted to enhance specific color intensities, and color filters are used to extract distinct colors, achieving high color reproducibility and a wide color gamut without the need for separate coloring layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If side-by-side patterning is used to display full-color image, then color display capability is improved, but manufacturing complexity and resolution are worsened
Solution Approach 1:
The patent merges the EL layers of multiple light-emitting elements into a single shared EL layer that emits white light. Color filters are then used to extract specific colors (red, green, blue) from this common white light source, eliminating the need for separate colored EL layers and simplifying manufacturing while maintaining full-color display capability
Solution Approach 2:
A single white light-emitting EL layer serves multiple functions by providing the light source for all color sub-pixels. The color filters positioned over each sub-pixel region extract the required colors from this universal white light source, reducing the number of EL layer fabrication processes needed
2Manufacturing precision
If white-color filter method is used, then resolution is improved, but color gamut and color purity are worsened
Solution Approach 1:
The patent applies local quality by positioning specific color filters over different regions (sub-pixels) of the same EL layer. Each region extracts a specific color (red, green, or blue) from the white light emitted by the EL layer, enabling high resolution through shared EL layers while maintaining wide color gamut through selective color filtration
Solution Approach 2:
The patent utilizes color filters with specific transmission characteristics to convert the white light from the EL layer into distinct colors. By carefully designing the spectral transmission properties of the color filters, the system achieves both high resolution and wide color gamut coverage
3Measurement precision
If separate colored EL layers are formed for each color, then color accuracy is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent combines multiple colored EL layers into a single white light-emitting EL layer. This reduces the total number of EL layers that need to be fabricated and maintained, thereby reducing power consumption while color accuracy is preserved through the use of color filters to extract pure red, green, and blue colors from the white light
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
The solution enables high-resolution, full-color displays with improved color accuracy and reduced power consumption by optimizing the optical path lengths and using color filters to intensify specific wavelengths, thereby covering a broader color spectrum efficiently.
Implementation Method 1
In a light-emitting element, voltage application between a pair of electrodes causes, in an EL layer, recombination of electrons and holes injected from the electrodes, which brings a light-emitting substance (organic compound) contained in the EL layer into an excited state. Light is emitted when the light-emitting substance returns to the ground state from the excited state.
Implementation Method 2
color filters are used to extract distinct colors, achieving high color reproducibility and a wide color gamut
Data Source
AI summary
Provided is a light-emitting device that can display an image with a wide color gamut or a novel light-emitting element. The light-emitting device includes a plurality of light-emitting elements each of which includes an EL layer between a pair of electrodes. Light obtained from a first light-emitting element through a first color filter has, on chromaticity coordinates (x, y), a chromaticity x of greater than 0.680 and less than or equal to 0.720 and a chromaticity y of greater than or equal to 0.260 and less than or equal to 0.320. Light obtained from a second light-emitting element through a second color filter has, on chromaticity coordinates (x, y), a chromaticity x of greater than or equal to 0.130 and less than or equal to 0.250 and a chromaticity y of greater than 0.710 and less than or equal to 0.810. Light obtained from a third light-emitting element through a third color filter has, on chromaticity coordinates (x, y), a chromaticity x of greater than or equal to 0.120 and less than or equal to 0.170 and a chromaticity y of greater than or equal to 0.020 and less than 0.060.