Multi-Vision OLED Display Luminance Deviation Compensation
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Solution Overview
Problem
In multi-vision systems comprising multiple OLED display modules, luminance deviation occurs due to differences in driving time, leading to inconsistent image brightness when modules are replaced or driven for extended periods.
Innovation Solution
The system employs inter-module communication to synchronize driving times and adjust luminance by determining a common average picture level (APL) and automatic current limit (ACL) values across modules, applying target gains to ensure uniformity and prevent luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED display modules are driven for extended periods to maintain high brightness and performance, then display quality is improved, but luminance deviation occurs between modules due to different driving times
Solution Approach 1:
The system performs preliminary actions by having each display module report its driving time to a host system before luminance adjustment is needed. The host system calculates target gains based on these pre-collected driving time data, enabling proactive luminance compensation before visible deviation occurs between modules with different usage histories.
Solution Approach 2:
The system changes the luminance parameter dynamically by applying different target gains to each display module based on its individual driving time. Modules with longer driving times receive higher target gains to compensate for degradation, while newer modules receive lower gains, thereby maintaining overall luminance uniformity across the multi-vision system.
2Device complexity
If display modules are independently driven without synchronization, then system complexity is reduced, but luminance deviation occurs between modules
Solution Approach 1:
The host system acts as an intermediary that collects driving time information from independently driven display modules, calculates appropriate target gains, and distributes adjustment commands back to each module. This intermediary approach maintains the independence of individual modules while coordinating their luminance characteristics through centralized calculation and distribution.
Solution Approach 2:
The system implements feedback by having each display module report its driving time to the host system, which then uses this information to calculate target gains for luminance adjustment. This feedback loop enables the system to automatically compensate for luminance deviation based on actual usage patterns without requiring complex real-time coordination between modules.
3Reliability
If a new display module replaces a malfunctioning one in a multi-vision system, then system reliability is improved, but luminance deviation occurs due to different driving times
Solution Approach 1:
When a new display module is installed, the system performs preliminary action by having the new module report its driving time (which would be minimal or zero) to the host system. The host system then calculates a higher target gain for the new module to compensate for its superior condition compared to older modules, ensuring seamless luminance integration upon replacement.
Solution Approach 2:
The system adjusts the luminance parameter by applying differentiated target gains based on driving time. Newly replaced modules with short driving histories receive higher target gains to match the luminance output of older modules that have undergone degradation, thereby maintaining uniform appearance across the multi-vision display system.
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 effectively minimizes luminance deviations between modules, maintaining consistent image brightness even when modules are replaced or driven for varying durations, thereby enhancing display uniformity and extending OLED device lifespan.
Implementation Method 1
an organic light emitting diode (OLED) display using an OLED, which uses a self-emissive device for emitting light from an organic light emitting layer via recombination between electrons and holes
Data Source
AI summary
A multi-vision system for preventing luminance deviation due to a driving time difference in a plurality of display modules is disclosed. The plurality of display modules adjust driving time of the respective display modules to be identical or similar via inter-module communication, determines target gain according to the adjusted driving time, and applies the determined target gain to correct luminance of received image.