OLED Blue Light Emission Control via Voltage-Selected Layers
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Solution Overview
Problem
Organic light-emitting diodes (OLEDs) emit blue light that can penetrate the eyes and cause vision deterioration due to prolonged exposure, as they lack effective mechanisms to control blue light emission wavelengths.
Innovation Solution
A light-emitting device with a base substrate and two blue light-emitting layers between electrodes, where different voltages (first and second threshold voltages) control the emission of light with varying wavelengths, allowing for the distinction between light blue and dark blue light emission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED emits blue light to achieve wide color gamut and high brightness, then display performance is improved, but blue light penetrates eyes and causes vision deterioration
Solution Approach 1:
The patent divides the blue light-emitting structure into multiple emitting layers with different maximum emission wavelengths. By segmenting the emission spectrum, the device can selectively emit at different wavelengths depending on the applied voltage, thereby controlling the harmfulness of the emitted blue light while maintaining display performance.
Solution Approach 2:
The patent changes the emission wavelength parameter by applying different voltage differences to the electrodes. When a first voltage difference is applied, the first emitting layer emits light with a first maximum wavelength; when a second voltage difference is applied, the second emitting layer emits light with a second maximum wavelength. This dynamic parameter adjustment allows control over the blue light's harmful effects.
2Object-affected harmful factors
If multiple blue light-emitting layers with different wavelengths are used to control blue light emission, then eye protection is improved, but device structure becomes more complex
Solution Approach 1:
The patent combines multiple blue light-emitting layers with different emission characteristics into a single integrated device structure. Both emitting layers are positioned between the same pair of electrodes, and the device controls both layers through a unified voltage control mechanism, thereby reducing overall structural complexity while maintaining the ability to emit at different wavelengths.
Solution Approach 2:
The patent makes the single device structure capable of multiple functions by incorporating different emitting layers that can be selectively activated. The same electrode structure serves to control both emitting layers, and the device can switch between different emission modes (eye-protection mode and non-eye-protection mode) using the same physical structure, thereby avoiding the need for separate control mechanisms.
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 solution allows the light-emitting device to switch between emitting light blue light for eye protection and dark blue light, alleviating the issue of blue light-induced eye damage by varying the voltage difference between the electrodes.
Implementation Method 1
at least two blue light-emitting layers located between the first electrode and the second electrode. The different blue light-emitting layers emit light with different wavelengths
Data Source
AI summary
Disclosed are a light-emitting device, a display panel, and a driving method of the light-emitting device. The light-emitting device includes: a base substrate, a first electrode on a side of the base substrate, a second electrode on a side, facing away from the base substrate, of the first electrode, and at least two blue light-emitting layers located between the first electrode and the second electrode. Different blue light-emitting layers emit light with different wavelengths. The first electrode and the second electrode are configured to be applied with different voltages. A voltage difference between the first electrode and the second electrode includes a first threshold voltage and a second threshold voltage, and under control of the first threshold voltage, one of the blue light-emitting layers emits light; and under control of the second threshold voltage, another blue light-emitting layer emits light.