Anti-Parallel LED Pixel Matrix Driver Circuit for Compatibility
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Solution Overview
Problem
Existing driver circuits for LED matrices with anti-parallel LEDs cannot be used interchangeably with those without anti-parallel LEDs, limiting the flexibility and compatibility of control systems.
Innovation Solution
Incorporating a driver circuit for each row with current adjustment circuits and current mirrors for each dipole, allowing independent control of current flow through both LEDs in a dipole, utilizing controllable switches and PWM signals for current adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driver circuits are designed specifically for LED matrices with anti-parallel LEDs, then control capability for bidirectional current flow is improved, but device complexity and lack of interchangeability increase
Solution Approach 1:
The patent implements a universal driver circuit that can control both anti-parallel LED configurations and standard LED configurations through a single interface. The circuit uses decoupling switches to reconfigure the connection topology, allowing the same driver circuit to adapt to different LED arrangements without requiring separate specialized circuits for each case.
2Measurement precision
If separate driver circuits are used for anti-parallel LED matrices, then control precision for bidirectional current is improved, but interchangeability between different LED matrix types deteriorates
Solution Approach 1:
The driver circuit incorporates dynamically reconfigurable connection paths using decoupling switches that can change the circuit topology based on the LED matrix type. This dynamic reconfiguration allows the circuit to adapt its internal connections to match the required LED configuration, maintaining control precision while enabling interchangeability between different LED matrix types.
Solution Approach 2:
The decoupling switches act as intermediary elements between the driver circuit and the LED matrix, enabling the driver circuit to interface with different LED configurations (anti-parallel or standard) through the same control interface. These switches mediate the connection changes required to support multiple LED types without requiring separate dedicated driver circuits.
3Device complexity
If fixed connection paths are used in driver circuits, then circuit simplicity is improved, but flexibility in controlling different LED configurations deteriorates
Solution Approach 1:
The driver circuit is segmented into multiple independent control paths with individual decoupling switches for each LED column. This segmentation allows each column to be independently configured for anti-parallel or standard LED connections, providing flexibility in controlling different LED configurations while maintaining a relatively simple overall circuit structure based on repeated modular units.
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
Enables the use of a single driver circuit for LED pixel matrices with and without anti-parallel LEDs, facilitating flexible control of LED intensity and color generation.
Implementation Method 1
The arrangement also includes one current mirror per row, which has a first connection and a reference connection per each dipole of the row. A current is adjustable via a second current path using the current mirror for each dipole as a function of a signal at the reference connection assigned to the dipole
Implementation Method 2
In the driver circuit assigned to the row, a current is adjustable via one first current path each using each current adjustment circuit, wherein each first current path extends from the first connection of the arrangement via the first switch assigned to the row, via the first connection of one of the dipoles of the row, via the first LED of the dipole
Implementation Method 3
The LEDs connected anti-parallel that are used for the pixels form a dipole or gate, wherein the direction of the voltage applied at the dipole or the direction of the current flowing through the dipole determines which LED generates light. If the LEDs have different colors, the color emitted is determined by the direction of the voltage or by the direction of the current
Data Source
AI summary
The invention relates to an arrangement including an LED pixel matrix and a driver circuit for controlling the LED pixel matrix, wherein each LED pixel is formed from a dipole made up of two LEDs connected anti-parallel. The LED pixel matrix includes at least one row and multiple columns of the dipoles forming the LED pixel, and the dipoles are connected with a first connection to a shared line. The shared line is connected to a node between a second connection of a first controllable switch assigned to the rows and to a first connection of a second controllable switch assigned to the row. A first connection of the first switch assigned to the row is connected to a first connection of the arrangement, and a second connection of the second switch assigned to the row is connected to a second connection of the arrangement.