Backlight Assembly Noise Removal Circuit Design
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Solution Overview
Problem
Backlight assemblies with LED dimming blocks are prone to malfunctions due to external noise applied to the reset terminal of the block driving unit, leading to improper operation of the dimming blocks.
Innovation Solution
Incorporation of a noise removing circuit, a system reactivating circuit, and a register maintaining circuit to prevent noise interference, including a transistor, resistors, and capacitors to filter noise, and using parity bits to detect and manage noise, ensuring stable operation of the block driving units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a block driving unit is used to drive multiple dimming blocks, then power consumption is reduced and contrast ratio is improved, but the system becomes susceptible to noise-induced malfunctions
Solution Approach 1:
A noise removing circuit is introduced as an intermediary component between the controller unit and the block driving unit. This circuit includes a transistor, resistor, and capacitor that work together to filter out noise from the reset terminal signal, preventing noise-induced malfunctions while preserving the block driving unit's ability to control multiple dimming blocks efficiently
Solution Approach 2:
The noise removing circuit performs preliminary noise filtering before the reset signal reaches the block driving unit. By proactively removing noise from the signal path, the system prevents malfunctions before they can occur, ensuring stable operation of the dimming blocks
2Reliability
If external noise is applied to the reset terminal of the block driving unit, then the block driving unit may malfunction, but adding noise protection increases device complexity
Solution Approach 1:
The noise removing circuit serves as a simple intermediary component inserted between the controller and block driving unit. It uses basic electronic elements (transistor, resistor, capacitor) to provide noise filtering functionality without significantly complicating the overall system architecture
Solution Approach 2:
The noise filtering function is extracted as a separate, dedicated circuit module. By isolating the noise removal function from the main signal processing path, the system achieves noise immunity without integrating complex protection mechanisms throughout the entire signal path
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
Prevents malfunctions by removing noise from the reset terminal, maintaining register settings, and reactivating the system when noise is detected, ensuring consistent operation of the dimming blocks and overall backlight assembly.
Implementation Method 1
a gate terminal of the transistor may receive the shutdown signal to turn a channel of the transistor on and off
Implementation Method 2
A source terminal of the transistor may be electrically connected to the reset terminal of the block driving unit, a drain terminal of the transistor may be connected to an external ground terminal
Data Source
AI summary
A backlight assembly includes a light source unit, at least one block driving unit, a controller unit and a noise removing circuit. The light source unit includes a plurality of dimming blocks generating light. The block driving unit drives the dimming blocks. The controller unit controls the block driving unit. The noise removing circuit is connected to the block driving unit and the controller unit to prevent noise from being applied to a reset terminal of the block driving unit.