IR-Drop Compensation in Multi-Driver OLED Panels
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels experience display mura due to voltage drops across power supply lines, leading to luminance reduction and image quality issues, which existing technologies have not adequately addressed.
Innovation Solution
A display system with multiple display drivers that generate and exchange total current data between regions to perform IR-drop compensation, ensuring accurate voltage data generation and distribution across the panel, thereby mitigating the effects of voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple display drivers are used to drive different regions of the display panel, then the display area and resolution are improved, but voltage drop across power supply lines causes display mura and luminance inconsistency
Solution Approach 1:
The display panel is divided into multiple regions, each driven by a separate display driver. Each driver independently calculates and compensates for voltage drop in its assigned region based on local current data, enabling precise regional compensation while maintaining overall display consistency.
Solution Approach 2:
Total current data is exchanged between adjacent display drivers to provide feedback information about current consumption patterns. This feedback enables each driver to adjust its voltage compensation strategy based on the actual current draw of neighboring regions, improving overall luminance uniformity.
2Device complexity
If voltage compensation is performed without considering total current data from all regions, then the processing complexity is reduced, but the accuracy of IR-drop compensation deteriorates
Solution Approach 1:
Total current data from all regions is collected and processed in advance before voltage data generation. This preliminary aggregation of current information enables accurate IR-drop compensation calculations to be performed subsequently, ensuring high compensation accuracy without excessive real-time processing complexity.
Solution Approach 2:
Total current data acts as an intermediary parameter that bridges the relationship between pixel current consumption and voltage drop. By using this intermediate representation, the system achieves accurate compensation without requiring complex direct measurements of voltage drops across all power supply lines.
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 system effectively suppresses display mura by accurately compensating for IR-drop across the power supply lines, maintaining consistent luminance and image quality across the OLED display panel.
Implementation Method 1
Generating the voltage data includes an IR-drop compensation based on the first region total current data and the second region total current data
Data Source
AI summary
A display system includes a display panel and first and second display drivers. The first display driver is configured to generate first region total current data corresponding to a subtotal of estimated pixel currents of respective pixels in a first region of the display panel. The second display driver is configured to generate second region total current data corresponding to a subtotal of estimated pixel currents of respective pixels in a second region of the display panel. The first display driver is further configured to receive the second region total current data from the second display driver, receive first image data for the first region; generate first voltage data based on the first image data, and update the first region of the display panel based on the first voltage data. Generating the first voltage data includes an IR-drop compensation based on the first and second region total current data.