LED Backlight Driving Circuit Pin Reduction via External Addressing
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Solution Overview
Problem
Conventional mini LED backlight modules face challenges in attaching miniaturized driving integrated circuits with multiple pins to printed circuit boards or glass plates due to poor yield, necessitating a reduction in the number of pins for improved attachment efficiency.
Innovation Solution
The proposed LED backlight driving circuit employs a plurality of driving integrated circuits connected to data transmission lines and selecting circuits, allowing for addressing without an addressing pin, thereby reducing the number of pins to four or fewer, and utilizing selecting switches to address individual integrated circuits during the addressing mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of pins of driving integrated circuits is reduced to less than 4, then the yield of attaching to PCB or glass plate is improved, but the functionality of addressing individual integrated circuits may be compromised
Solution Approach 1:
The patent extracts the addressing pin from the driving integrated circuit package and relocates the addressing functionality to external selecting circuits. This allows the driving integrated circuit to use only 4 or fewer pins (power pin, ground pin, data input pin, and input/output pin) while maintaining full addressing capability through the external circuit architecture.
Solution Approach 2:
The patent introduces selecting circuits as intermediary components between the data transmission line and the driving integrated circuits. These selecting circuits receive address signals and data signals, and use the address signals to selectively connect to the appropriate driving integrated circuit, thereby enabling addressing functionality without requiring an addressing pin on the driving integrated circuit itself.
2Manufacturing precision
If driving integrated circuits are miniaturized, then the display device can achieve higher resolution and better performance, but the difficulty of attaching to PCB or glass plate increases due to poor yield
Solution Approach 1:
By extracting the addressing pin from the driving integrated circuit package, the patent reduces the pin count to 4 or fewer, which significantly improves the yield of attaching miniaturized driving integrated circuits to PCB or glass plates while maintaining the miniaturization benefits.
3Device complexity
If multiple driving integrated circuits share data transmission lines, then the circuit complexity is reduced, but the addressing of individual integrated circuits becomes more difficult
Solution Approach 1:
The selecting circuits serve as intermediaries that manage the shared data transmission lines. They receive both address signals and data signals, use the address signals to identify the target driving integrated circuit, and then connect the data transmission line to the appropriate selected circuit, thereby enabling individual addressing despite shared transmission lines.
Solution Approach 2:
The patent implements dynamic switching in the selecting circuits that connect to the data transmission line only when the corresponding address signal is detected. This dynamic connection establishment allows multiple driving integrated circuits to share the same data transmission line while still enabling individual addressing through time-multiplexed connections.
Data Source
AI summary
A LED backlight driving circuit includes a plurality of driving integrated circuits coupled to a data transmission line and a plurality of selecting circuits respectively connected to the plurality of driving integrated circuits. In an addressing mode, the plurality of selecting circuits are used to select one driving integrated circuit from the plurality of driving integrated circuits to set an address. The plurality of driving integrated circuits can set addresses via input/output pins connected to LEDs. So a number of pins of the driving integrated circuit can be equal to or less than 4, which will rise a yield of the LED backlight driving circuit setting in a PCB or in a glass board.