Color Switchable Structure Extends OLED Display Life
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Solution Overview
Problem
The short life of blue light-emitting materials in organic light-emitting display panels leads to premature failure and reduced display life, limiting their application due to high photon energy causing material attenuation.
Innovation Solution
A display panel with an organic electroluminescent device layer, a detection sensor, and a color switchable structure, where the color switchable structure includes a cholesteric liquid crystal layer doped with a single-electron oxidant and a compound influencing spiral shapes of liquid crystal molecules, allowing for adjustable color display and extending the display life by switching signals to sub-units when parameters fall below thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue phosphorescent material is used in the organic light-emitting layer, then the display can achieve high brightness and wide color gamut, but the service life of the display panel is significantly reduced due to material attenuation
Solution Approach 1:
The patent changes the working state parameters of the display system by switching between different display modes (organic electroluminescent device layer displaying vs. color switchable structure displaying) based on the service life stage of the organic material, thereby extending the overall service life while maintaining brightness performance
Solution Approach 2:
The patent implements a dynamic switching mechanism where the display system can transition between different display paths: when the organic electroluminescent device layer is healthy, it displays directly; when degradation is detected, the system switches to using the color switchable structure with liquid crystal layer, thereby adapting to changing conditions and extending service life
2Use of energy by stationary object
If the organic electroluminescent device layer is used for display, then the display panel achieves thin profile and low energy consumption, but the blue light emission causes rapid material attenuation and failure
Solution Approach 1:
The patent incorporates a detection sensor and control circuit that monitor the display parameters of the organic electroluminescent device layer in advance, detecting degradation trends before complete failure occurs, and proactively switch to the color switchable structure to cushion against total failure
Solution Approach 2:
The color switchable structure acts as an intermediary backup system that takes over the display function when the organic electroluminescent device layer degrades, mediated by the detection sensor and control circuit that monitor and trigger the switch based on real-time parameter detection
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 prolongs the service life of the display panel by allowing the color switchable structure to take over when the organic electroluminescent device layer's parameters drop, maintaining display quality and increasing color gamut through simultaneous or separate operation of both layers.
Implementation Method 1
a cholesteric liquid crystal layer, and a second alignment layer and a second electrode layer which are successively located on a side of the detection sensor away from the base substrate
Implementation Method 2
a first compound that influences spiral shapes of liquid crystal molecules
Implementation Method 3
the organic light-emitting layer emits light under the drive of a voltage applied to the first electrode and the second electrode
Implementation Method 4
the cholesteric liquid crystal layer is doped with a single-electron oxidant and a first compound that influences spiral shapes of liquid crystal molecules
Data Source
AI summary
The present disclosure provides a display panel, a display device and a display method. The display panel includes a base substrate, and an organic electroluminescent device layer, a detection sensor and a color switchable structure which are successively located on the base substrate and are insulated from each other, where the organic electroluminescent device layer includes a plurality of sub-pixels, and the color switchable structure includes sub-units disposed in one-to-one correspondence with the sub-pixels; the sub-units are configured to transmit light emitted by the sub-pixels under the control of applied different signals, or to display light of colors corresponding to the applied signals; and the detection sensor is configured to detect display parameters of the sub-pixels or the sub-units.