Pixel Circuit Bi-Directional Driving Current Management
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Solution Overview
Problem
Existing self-illuminating pixel circuits lack a suitable driving circuit to efficiently manage bi-directional driving currents for light emitting elements with both forward and reverse driving characteristics, limiting their application and performance.
Innovation Solution
A pixel circuit design incorporating a light emitting element with a driving block that generates and manages first and second driving currents flowing in opposite directions through separate current paths, utilizing local and common light emitting switches and a data signal to control current amplitude, enabling bi-directional driving capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional single-direction driving circuit is used for light emitting elements with bi-directional driving characteristics, then the circuit structure remains simple, but the light emitting element cannot operate properly in both forward and reverse directions
Solution Approach 1:
The driving circuit is segmented into separate first and second current paths, where the first current path drives the first light emitting part in forward direction and the second current path drives the second light emitting part in reverse direction. This segmentation allows independent optimization of each driving path while maintaining overall bi-directional capability.
Solution Approach 2:
The driving block is designed with multi-functionality to generate both first and second driving currents with opposite directions through different current paths. The same driving block can selectively activate either current path based on the driving direction requirement, making it a universal solution for bi-directional light emitting elements.
2Adaptability or versatility
If separate current paths are introduced for bi-directional driving, then the light emitting element can be driven in both directions, but the circuit complexity increases
Solution Approach 1:
The first and second current paths are merged at the driving block, which integrates the control logic for both driving directions. The driving block receives a single data signal and internally routes it to appropriate current paths based on the required driving direction, reducing overall system complexity despite having separate current paths.
Solution Approach 2:
The circuit employs dynamic switching between first and second current paths based on the driving direction requirement. The driving block dynamically selects which current path to activate, allowing the circuit to adapt its configuration in real-time rather than requiring permanently separate independent circuits.
3Adaptability or versatility
If bi-directional driving currents are implemented, then the pixel circuit becomes applicable to novel light emitting elements, but the control mechanism becomes more complex
Solution Approach 1:
The driving block is pre-configured with the capability to generate both first and second driving currents with opposite directions. The control mechanism prepares both current paths in advance and selectively activates the appropriate one based on the driving direction signal, avoiding the need for complex real-time conversion or additional control logic during operation.
Data Source
AI summary
A pixel circuit includes a light emitting element, a first local light emitting switch, a second local light emitting switch, a common light emitting switch, and a driving block. The light emitting element has a first light emitting part and a second light emitting part. The first local light emitting switch is coupled between a first power terminal and the driving block. The second local light emitting switch is coupled between a second power terminal and the driving block. The common light emitting switch is coupled between the driving block and the light emitting element. The driving block provides a first driving current and a second driving current to the first light emitting part and the second light emitting part respectively based on a first frame gate signal and a second frame gate signal; a direction of the first driving current is different from that of the second driving current.