OLED Display Panel Voltage Control for High-Temperature Color Stability
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Solution Overview
Problem
The high-temperature reliability test causes irreversible changes in the light emitting layer of OLED devices, leading to color shifts and affecting display quality, particularly in low-gray-scale displays.
Innovation Solution
A display panel with a voltage control module that adjusts the anode voltage of light emitting devices to maintain a constant ratio of electrons to holes across different gray scales, using pulse signals with varying durations and amplitudes for each sub-pixel unit to stabilize the anode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light emitting layer is subjected to high-temperature reliability test, then the device undergoes thermal stress and operational validation, but the light emitting layer undergoes irreversible changes causing color shift
Solution Approach 1:
The patent introduces an exciton blocking layer between the electron blocking layer and the light emitting layer before the device undergoes high-temperature reliability testing. This preliminary structural preparation prevents exciton diffusion into the electron blocking layer during subsequent thermal stress and operation, thereby preventing irreversible changes and color shifts in the light emitting layer while maintaining reliability validation capability
2Illumination intensity
If the anode voltage is increased to improve electron injection, then the brightness increases, but the electron-hole ratio changes affecting display quality
Solution Approach 1:
The patent introduces an exciton blocking layer as an intermediary component between the electron blocking layer and the light emitting layer. This intermediate layer selectively blocks exciton diffusion while allowing electron injection to proceed, enabling brightness enhancement through voltage control without disrupting the electron-hole ratio balance in the light emitting layer
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 approach prevents color shifts due to temperature changes, ensuring consistent brightness and improved display quality by maintaining the electron-hole ratio, thereby enhancing the reliability of OLED displays.
Implementation Method 1
electrons and holes are injected into a light emitting layer from a cathode and an anode, respectively, and are recombined in the light emitting layer to emit light
Implementation Method 2
An organic light emitting diode (OLED) is a light emitting device with an organic solid semiconductor used as a light emitting material
Data Source
AI summary
The present disclosure provides a display panel and a display apparatus, and belongs to the field of display technology, and can solve the problem of the color shift easily occurring in the high-temperature reliability test in the related display panel. The display panel of the present disclosure includes: a plurality of sub-pixel units and a voltage control module; each sub-pixel unit includes: a light emitting device; and the voltage control module is connected to an anode of the corresponding light emitting device, and is configured to control an anode voltage of the corresponding light emitting device, so that a ratio of the number of electrons to the number of holes of the light emitting device is unchanged at different gray scales.