OLED Display Panel Charge Control to Prevent Low-Grayscale Flashing
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Solution Overview
Problem
The flashing phenomenon occurs in organic light emitting display panels due to fluctuations in the potential of the charge generating layer at low grayscale levels.
Innovation Solution
A display panel design that includes a substrate, a circuit layer, and a light emitting element layer with a first electrode, a second electrode, a charge generating layer, and a third electrode, where the potential of the charge generating layer is controlled by a charge generating layer control electrode to prevent flashing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tandem structure with charge generating layer is used to improve efficiency and lifetime, then high efficiency and improved lifetime characteristics are achieved, but flashing phenomenon occurs at low grayscale due to potential fluctuations in the charge generating layer
Solution Approach 1:
A third electrode is introduced as an intermediary component between the second light emitting layer and the charge generating layer. This third electrode acts as a mediator to control and stabilize the potential distribution in the charge generating layer, preventing potential fluctuations that cause flashing while maintaining the tandem structure's efficiency and lifetime benefits
Solution Approach 2:
The invention changes the electrical parameter (potential) distribution in the charge generating layer by introducing the third electrode. By controlling the potential through this additional electrode, the flashing phenomenon is suppressed while maintaining the high efficiency and lifetime characteristics provided by the tandem structure
2Stability of the object's composition
If potential control is implemented to prevent flashing, then image stability is improved, but device complexity increases due to additional electrode
Solution Approach 1:
The third electrode is designed to serve multiple functions: it controls the potential in the charge generating layer to prevent flashing, maintains image stability, and integrates with the existing tandem structure without requiring separate control systems. This multi-functionality justifies the additional component by providing multiple benefits from a single structural addition
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 effectively prevents the flashing phenomenon in low grayscale images by equalizing the potential differences between the light emitting layers and the charge generating layer, enhancing image stability and reducing power consumption.
Implementation Method 1
The OLED display device includes an organic light emitting layer in which electrons and holes are combined to emit visible light
Implementation Method 2
a charge generating layer is provided between the stacks, and thus the stacks are separated by the charge generating layer
Data Source
AI summary
Discussed is a display panel including a substrate, a circuit layer disposed on the substrate, and a light emitting element layer disposed on the circuit layer and electrically connected to a pixel circuit of the circuit layer. The light emitting element layer includes a first electrode and a second electrode electrically connected to the pixel circuit, a first light emitting layer, a charge generating layer, and a second light emitting layer stacked on the first electrode, and a third electrode disposed on the second light emitting layer. The second electrode can supply a voltage to the charge generation layer that is different from those supplied to the first electrode and the third electrode.