OLED Display Panel with Auxiliary Emitters for Aging Brightness Compensation
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Solution Overview
Problem
Existing OLED display panels experience brightness attenuation and inconsistent brightness due to aging, which current optical compensation methods cannot effectively address, especially as they require large equipment for one-time pre-shipment compensation and cannot adapt to long-term use changes.
Innovation Solution
A display panel design incorporating auxiliary electrodes and light guiding layers, allowing for continuous brightness compensation by detecting and adjusting pixel brightness through auxiliary light emitting units without affecting display brightness, and a brightness compensator to collect and compensate pixel unit brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical compensation method using CCD cameras is used to collect brightness of each pixel, then brightness uniformity is improved, but device size increases and compensation cannot be performed continuously
Solution Approach 1:
The patent uses auxiliary electrodes to create auxiliary light emitting units that copy the structure and emission characteristics of main light emitting units. These auxiliary units are integrated within the display panel itself, eliminating the need for external CCD cameras and large compensation equipment while enabling continuous brightness monitoring and compensation.
Solution Approach 2:
The display panel performs self-compensation by using its own auxiliary light emitting units to monitor and detect brightness changes. The panel structure itself serves the dual purpose of display and compensation, with auxiliary electrodes and light guiding layers integrated directly into the panel, allowing continuous self-adjustment without external equipment.
2Manufacturing precision
If one-time compensation before shipment is performed, then initial brightness uniformity is improved, but brightness differences caused by aging during long-term use cannot be compensated
Solution Approach 1:
The patent enables continuous compensation action by integrating auxiliary light emitting units that can operate throughout the display panel's service life. The auxiliary electrodes and light guiding layers are permanently embedded in the panel structure, allowing ongoing brightness monitoring and adjustment from manufacturing through extended use, compensating for aging effects continuously rather than just once at shipment.
3Adaptability or versatility
If auxiliary light emitting units are added for brightness detection, then continuous brightness compensation is enabled, but device structure becomes more complex
Solution Approach 1:
The patent merges the auxiliary light emitting units with the main light emitting unit structure. The auxiliary electrodes are positioned adjacent to main electrodes, and both share common light guiding layers and emission materials. This integration allows the auxiliary units to be formed during standard manufacturing processes without adding separate complex subsystems, achieving continuous compensation capability while minimizing structural complexity.
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
Enables continuous brightness adjustment and uniformity by detecting and compensating for aging-related brightness changes without reducing display brightness, and maintains consistent brightness even in bent conditions.
Implementation Method 1
Each of the plurality of light guiding layers is in contact with the auxiliary light emitting unit and configured to guide light emitted by the auxiliary light emitting unit out to obtain brightness of a pixel unit corresponding to the auxiliary light emitting unit
Data Source
AI summary
A display panel includes a substrate, a driving circuit layer, a first electrode layer, a light emitting layer, a second electrode layer, and light guiding layers. The first electrode layer includes first electrodes arranged in an array and auxiliary electrodes arranged at intervals. Each of the auxiliary electrodes is arranged at a side of a corresponding one of the first electrodes. Each of the auxiliary electrodes, a corresponding portion of the light emitting layer, and a corresponding portion of the second electrode layer form an auxiliary light emitting unit. A corresponding one of the light guiding layers is in contact with the auxiliary light emitting unit and configured to guide light emitted by the auxiliary light emitting unit out to obtain brightness of a pixel unit corresponding to the auxiliary light emitting unit. A display device is further provided.