Light Emitting Device Common Transmission Line Control
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Solution Overview
Problem
Conventional light emitting device control systems require multiple wires for transmitting brightness and address setting signals, leading to increased wiring complexity.
Innovation Solution
A control system using a common transmission line to sequentially set addresses for multiple drive circuits and transmit data packets, allowing only one common line to be used for both address setting and brightness control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transmission lines are used for address setting signals and brightness control signals, then signal transmission reliability is improved, but wiring complexity increases
Solution Approach 1:
The patent combines address setting signals and brightness control signals into a single common transmission line. The control circuit multiplexes the transmission line to sequentially transmit different types of signals to drive circuits, reducing the number of wires from N separate brightness control lines plus address lines to just one common line, thereby resolving the contradiction between reliability and wiring complexity.
Solution Approach 2:
The common transmission line serves multiple functions: it transmits both address setting signals and brightness control signals to different drive circuits. The control circuit dynamically configures the transmission line to perform different roles at different times, making a single line universal for multiple signal types and destinations, thus reducing wiring complexity while maintaining reliable signal transmission.
2Ease of operation
If N wires are used to connect to each drive circuit for brightness control, then individual drive circuit control is improved, but the control system complexity increases
Solution Approach 1:
The patent merges N separate brightness control wires into a single common transmission line. The control circuit uses time-division multiplexing to send brightness control signals for different drive circuits sequentially over this single line, with each drive circuit receiving its specific signal based on address matching, thereby simplifying the control system while maintaining individual drive circuit control capability.
Solution Approach 2:
The control circuit employs periodic time-division multiplexing to transmit brightness control signals for different drive circuits at different time intervals over the common transmission line. Each drive circuit is activated at its designated time slot to receive and process its specific brightness control signal, enabling individual control without requiring separate permanent wiring for each circuit.
3Device complexity
If a common transmission line is used for both address setting and brightness control, then wiring complexity is reduced, but signal transmission timing becomes more complex
Solution Approach 1:
The control circuit implements periodic time-division multiplexing on the common transmission line, allocating specific time slots for address setting signals and other time slots for brightness control signals. This structured periodic transmission scheme manages timing complexity by creating a predictable, repeating pattern of signal transmission, allowing drive circuits to anticipate and properly process signals at their designated times.
Solution Approach 2:
The control circuit uses feedback mechanisms to manage timing on the common transmission line. Drive circuits send acknowledgment signals back to the control circuit to confirm receipt of address setting signals and brightness control signals. This feedback loop allows the control circuit to adjust timing and ensure proper signal delivery, managing the complexity of time-division multiplexing through active monitoring and adjustment.
Data Source
AI summary
A control system for a light emitting device is provided. The control system includes a control circuit, a common transmission line and a drive circuit string. The control circuit includes a control terminal. The drive circuit string includes N number of drive circuits, where N≥2. The drive circuit string is electrically connected to the control terminal of the control circuit through the common transmission line. Each of the drive circuits has a state setting. The state setting is in a transmission state when a setting of an assigned address of the drive circuit is completed. The control terminal transmits a command signal to each of the drive circuits via the common transmission line. The drive circuits read a command data piece or command data pieces within the command signal based on the assigned address.