Sub-Pixel Parallel Driving Layout for Low-IR-Drop Displays
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Solution Overview
Problem
Existing electronic devices with self-luminous displays face issues of voltage drop (IR drop) and increased resistance due to the need for higher driving currents and narrower power lines, which affect image quality and resolution.
Innovation Solution
The electronic device incorporates a driving unit connected to multiple sub-pixel circuits in parallel, with control signal lines controlling switching elements to reduce voltage drop and simplify layout, and includes a sensing circuit for electrical property inspection and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher driving current is provided to light emitting elements, then brightness is improved, but voltage drop increases
Solution Approach 1:
The pixel circuit is divided into multiple sub-pixel circuits (first, second, third sub-pixel circuits) that are connected in parallel. Each sub-pixel circuit has its own light emitting element and switching element. This segmentation allows the driving current to be distributed across multiple parallel paths, reducing the current burden on any single path and thereby reducing voltage drop while maintaining overall brightness.
2Reliability
If more driving elements and switching elements are installed in pixel circuits, then current stability is improved, but device complexity increases
Solution Approach 1:
The pixel circuit is divided into multiple sub-pixel circuits (first, second, third sub-pixel circuits) that are connected in parallel. Each sub-pixel circuit has its own light emitting element and switching element. This segmentation allows the driving current to be distributed across multiple parallel paths, reducing the current burden on any single path and thereby reducing voltage drop while maintaining overall brightness.
Solution Approach 2:
A sensing circuit is introduced to detect the electrical properties (such as voltage or current) of the sub-pixel circuits. The sensing circuit provides feedback information to a compensation circuit, which adjusts the driving signals to compensate for variations in electrical properties. This feedback mechanism ensures current stability without requiring excessive driving elements within each sub-pixel circuit.
3Manufacturing precision
If line widths of power lines are shrunk for high resolution, then display resolution is improved, but resistance of power lines increases
Solution Approach 1:
The pixel circuit is divided into multiple sub-pixel circuits (first, second, third sub-pixel circuits) that are connected in parallel. Each sub-pixel circuit has its own light emitting element and switching element. This segmentation allows the driving current to be distributed across multiple parallel paths, reducing the current burden on any single path and thereby reducing voltage drop while maintaining overall brightness.
Solution Approach 2:
Instead of increasing power line width in the horizontal dimension to reduce resistance, the patent introduces a vertical dimension by creating multiple parallel current paths through sub-pixel circuits. This dimensional approach allows current distribution without compromising the horizontal line width needed for high resolution display.
4Area of stationary object
If narrower power lines are used, then area is reduced for high resolution, but voltage drop worsens
Solution Approach 1:
The pixel circuit is divided into multiple sub-pixel circuits (first, second, third sub-pixel circuits) that are connected in parallel. Each sub-pixel circuit has its own light emitting element and switching element. This segmentation allows the driving current to be distributed across multiple parallel paths, reducing the current burden on any single path and thereby reducing voltage drop while maintaining overall brightness.
Solution Approach 2:
Instead of increasing power line width in the horizontal dimension to reduce resistance, the patent introduces a vertical dimension by creating multiple parallel current paths through sub-pixel circuits. This dimensional approach allows current distribution without compromising the horizontal line width needed for high resolution display.
Data Source
AI summary
Disclosed is an electronic device including a driving unit, a plurality of sub-pixel circuits and a plurality of control signal lines. Each of the plurality of sub-pixel circuits includes a first switching element and at least one light emitting element, and the sub-pixel circuits are electrically connected to the driving unit in parallel. The control signal lines are electrically connected to the sub-pixel circuits respectively.