LED Driving Device Bypass Register for Data Update Delay
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Solution Overview
Problem
Existing LED driving systems face significant delays in data updating due to the serial connection of multiple driving devices, leading to inefficiencies in controlling the brightness of LEDs in arrays, particularly in large displays where many drivers are connected in series, resulting in wasted resources and prolonged update times.
Innovation Solution
The proposed LED driving device incorporates a recognition circuit, switching circuit, register circuit, and buffer circuit with a bypass register, allowing for selective storage and output of data, enabling the bypass of unnecessary registers and reducing the clock cycles required for data updates by using a select signal to control the length of the register series, thereby minimizing delay time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple driving devices are connected in series to drive large LED arrays, then the coverage area increases, but the data update time increases significantly
Solution Approach 1:
The patent segments the serial data transmission path by introducing a bypass register that can selectively bypass multiple ordinary registers. This allows the data transmission path to be divided into a short bypass path and a long serial register path, enabling different update speeds for different LED regions while maintaining the series connection structure for large area coverage.
2Ease of operation
If all registers are updated even when only part of LEDs need brightness adjustment, then the control simplicity is maintained, but the update efficiency decreases
Solution Approach 1:
The patent introduces a dynamic control mechanism where the bypass register's enable signal can be dynamically adjusted based on which LEDs need updating. When only partial LED updates are needed, the bypass register is enabled to skip unnecessary register updates, thereby improving update efficiency while maintaining control simplicity through the same basic circuit structure.
3Device complexity
If a serial shift register is used to control LED brightness, then the register bit width can be reduced, but the update delay increases
Solution Approach 1:
The bypass register acts as an intermediary element between the data input and the ordinary registers. It provides a shortcut path that mediates the conflict between serial transmission simplicity and update speed by allowing data to skip the lengthy serial register chain when full updates are not necessary, thereby reducing update delay while maintaining the benefits of serial shift register control.
Data Source
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AI summary
A light emitting diode (LED) driving device outputs a driving signal according to a select signal, an update data, and an update command. The driving device includes a buffer circuit, a display data storage, and a signal generating circuit. The buffer circuit includes register series and a bypass register. The buffer circuit selectively stores the update data in the register series and the bypass register according to the update command. The display data storage stores multiple display data. The display data storage updates the display data by using the update data stored in the register series according to the update command. The signal generating circuit outputs the driving signal according to the display data. When the update data is stored in the bypass register, the clock of the update data passing through the driver is reduced.