Tuneable Sub-Pixel Wavelength Control for Defect Correction
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Solution Overview
Problem
Existing display technologies face issues with fixed sub-pixels that degrade over time, require different resolutions or luminance, and have limited color gamut, necessitating a solution for correcting local defects and enhancing display performance.
Innovation Solution
A light-emitting device with a tuneable sub-pixel comprising a primary light-emitting material and a tuning element, where the tuning element modifies the wavelength in response to electrical inputs, allowing real-time adjustment of color and luminance through piezoelectric actuators or quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed colour sub-pixels are used, then the display structure is simple and manufacturing is easier, but the colour gamut is limited and cannot be adjusted for different applications
Solution Approach 1:
The patent implements a tuneable sub-pixel where the emission wavelength can be dynamically adjusted using a tuning element such as a piezoelectric actuator that applies stress to strain the quantum dots, changing their emission wavelength in real-time. This dynamic capability allows the same sub-pixel to adapt to different colour gamut requirements without requiring multiple fixed sub-pixels for each wavelength, thereby resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent changes the physical parameter of the quantum dots by applying mechanical stress through a tuning element, which alters the band gap energy and consequently the emission wavelength. This parameter change approach enables a single sub-pixel structure to achieve multiple wavelength outputs, resolving the contradiction between needing adjustable colour gamut and maintaining simple device structure.
2Manufacturing precision
If sub-pixels are fixed in colour and position, then manufacturing precision requirements are lower, but local defects cannot be corrected and resolution is limited
Solution Approach 1:
The tuneable sub-pixel allows dynamic adjustment of emission wavelength to compensate for local defects such as yellowing or luminance loss in specific sub-pixels. By tuning the wavelength in real-time, the system can correct colour inaccuracies without requiring precise manufacturing of each individual sub-pixel position, thus resolving the contradiction between manufacturing precision and reliability.
3Adaptability or versatility
If multiple fixed sub-pixels are used to achieve different resolutions or luminance, then the base display functionality is sufficient, but the device complexity increases and flexibility is reduced
Solution Approach 1:
The tuneable sub-pixel serves multiple functions: it can adjust its emission wavelength to provide different colour outputs, modify luminance through wavelength selection, and potentially contribute to resolution enhancement by providing additional colour information. This multi-functionality allows a single sub-pixel to replace what would traditionally require multiple fixed sub-pixels, resolving the contradiction between adaptability and device complexity.
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 tuneable sub-pixel enables real-time modification of color, luminance, and resolution, correcting for local defects and expanding the color gamut, thereby improving display performance and flexibility.
Implementation Method 1
The tuning element may comprise a piezoelectric actuator that applies stress to the light-emitting material to strain the quantum dots.
Implementation Method 2
The quantum dots may undergo optical pumping and electrical pumping simultaneously, which may increase the optical gain and therefore the colour conversion efficiency.
Implementation Method 3
Quantum dots are known to emit light. In the event that an electron is excited from the valence band to the conduction band, a hole is left in the valence band. The resulting electron hole pair is known as an exciton, and the recombination of the electron and hole pair may result in the emission of a photon.
Data Source
AI summary
A light-emitting device having a pixel comprising a first non-tuneable sub-pixel configured to emit light at a first non-tuneable wavelength and a tuneable sub-pixel configured to emit light at a tuneable wavelength. The tuneable sub-pixel comprises a primary light-emitting material configured to emit light at a primary wavelength in response to a primary electrical input; and a tuning element configured to modify the primary wavelength to a secondary wavelength, wherein the secondary wavelength is tuneable, in response to a secondary electrical input.