Display Panel Voltage Segmentation for IR Drop Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compensation methods for variations in electrical characteristics of driving elements in organic light-emitting displays suffer from IR drop effects, leading to non-uniform brightness across the display panel due to voltage drops varying with position.
Innovation Solution
A display panel design that modulates data based on sensed electrical characteristics during a blanking interval, using separate driving voltages for active and blanking phases to compensate for variations and minimize IR drop effects, ensuring uniform brightness across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional internal or external compensation methods are used to compensate for variations in electrical characteristics of driving elements, then pixel-level compensation is achieved, but IR drop effect causes voltage drop and brightness non-uniformity across different positions on the screen
Solution Approach 1:
The display panel is divided into multiple regions along the voltage supply direction, with each region having an independent compensation circuit that senses and compensates for electrical characteristic variations locally. This segmentation allows each region to independently address its own IR drop issues without being affected by other regions, thereby achieving uniform brightness across the entire screen while maintaining pixel-level compensation capability
Solution Approach 2:
Different regions of the display panel are provided with locally-adapted compensation circuits that sense voltage drops specific to their position. Each compensation circuit adjusts the drive voltage locally to compensate for position-dependent IR drop effects, ensuring that each region maintains optimal brightness and electrical characteristic uniformity according to its specific conditions
2Device complexity
If a single voltage supply system is used for the entire display panel, then circuit simplicity is maintained, but position-dependent voltage drops cause non-uniform brightness
Solution Approach 1:
The voltage supply system is segmented into multiple independent regional supply circuits, each responsible for a specific region of the display panel. Each regional circuit includes its own compensation circuit that operates independently to sense and correct voltage drops in its designated region, thereby maintaining brightness uniformity while keeping each individual circuit module relatively simple
Solution Approach 2:
The voltage supply system transitions from a single one-dimensional supply line to a multi-dimensional network of regional supply circuits distributed across the display panel. This dimensional expansion allows voltage compensation to occur at multiple spatial locations simultaneously, addressing position-dependent brightness issues while maintaining overall system manageability
Data Source
AI summary
The disclosure relates to display panel and electroluminescence display using the same. The display panel includes: a sub-pixel, which comprises a light-emitting element and a driving element for driving the light-emitting element, the light-emitting element emitting light by a current in the driving element during a driving phase; and a power switching circuit configured to supply a first driving voltage to the sub-pixel during the driving phase in an active period and a blanking interval, and supply a second driving voltage to the sub-pixel during a data writing phase of the active period and during resetting, sensing, and data writing phases of the blanking interval.