Display Intermediate Layer Segmentation for Leakage Current Control
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Solution Overview
Problem
Display devices experience issues with light emission due to leakage currents, leading to distorted color coordinates at low grayscales and increased power consumption, which affect image quality.
Innovation Solution
The display device incorporates a substrate with first and second light emitting areas, anode electrodes, current removal lines in non-light emitting areas, intermediate layers with charge generation layers, and a cathode electrode to manage leakage currents, thereby preventing unwanted light emission and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display structure is used, then manufacturing is simpler, but lateral leakage currents cause light emission in non-light emitting areas
Solution Approach 1:
The intermediate layer is divided into multiple segments including a first intermediate layer, a charge generation layer, and a second intermediate layer. This segmentation allows each layer to perform specific functions: the first intermediate layer provides electrical connection, the charge generation layer generates charges to suppress leakage currents, and the second intermediate layer provides additional electrical connection, thereby preventing light emission in non-light emitting areas while maintaining manageable structural complexity
Solution Approach 2:
The charge generation layer acts as an intermediary between the first and second intermediate layers. It generates charges that suppress lateral leakage currents, serving as a mediator that prevents harmful electrical effects without requiring complete structural redesign of the display device
2Manufacturing precision
If conventional intermediate layer structure is used, then manufacturing is easier, but color coordinates are distorted at low grayscale
Solution Approach 1:
The intermediate layer is segmented into three functional layers: the first intermediate layer for electrical connection, the charge generation layer for suppressing leakage currents, and the second intermediate layer for additional electrical connection. This segmentation enables precise control of electrical properties to maintain accurate color coordinates at low grayscale while keeping each individual layer relatively simple to manufacture
Solution Approach 2:
Different regions of the intermediate structure are assigned different properties: the charge generation layer is positioned specifically in non-light emitting areas where leakage currents occur, while the first and second intermediate layers provide electrical connection in both light emitting and non-light emitting areas. This local differentiation optimizes color accuracy where needed without complicating the entire structure
3Loss of energy
If conventional current management is used, then device structure is simpler, but power consumption increases
Solution Approach 1:
The charge generation layer serves as an intermediary that actively manages leakage currents by generating charges to suppress lateral current flow. This mediator approach reduces energy loss from leakage without requiring complete redesign of the power management system, achieving lower power consumption with moderate structural addition
Solution Approach 2:
The harmful lateral leakage currents are extracted and suppressed by the charge generation layer, which removes the unwanted current path by generating counteracting charges. This extraction of harmful current flow reduces power consumption while maintaining the overall device structure
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 configuration effectively reduces lateral leakage currents, maintains color accuracy at low grayscales, and lowers power consumption, enhancing the overall image quality and efficiency of the display panel.
Implementation Method 1
a charge generation layer disposed on the first intermediate layer
Data Source
AI summary
A display device including a first overcoating layer disposed on a substrate; a first anode electrode disposed on the first overcoating layer to overlap a first light emitting area; a second anode electrode disposed on the first overcoating layer to overlap a second light emitting area; a current removal line disposed in a first non-light emitting area as an area between the first light emitting area and the second light emitting area; a first intermediate layer disposed to cover the current removal line, and including a first emitting layer; a charge generation layer disposed on the first intermediate layer; a second intermediate layer disposed on the charge generation layer, and including a second emitting layer; and a cathode electrode disposed on the second intermediate layer.