Backlight Control Circuit Microcontroller Feedback Loop
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Solution Overview
Problem
The existing backlight control circuits for LCDs are costly due to the need for multiple transistors to protect lamps, especially when the number of lamps increases, which complicates the circuit structure and increases costs.
Innovation Solution
A backlight control circuit that incorporates a microcontroller with multiple analog-to-digital input terminals to monitor the operating states of load circuits and feed this information back to the pulse width modulation integrated circuit, eliminating the need for additional transistors and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transistors are used to protect lamps in backlight control circuits, then the reliability of lamp protection is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple protection functions into a single integrated circuit chip that monitors all lamp conditions centrally. Instead of using separate transistors for each lamp protection function, the invention integrates voltage detection, current sampling, and protection control functions into one unified chip, thereby reducing circuit complexity while maintaining protection reliability.
Solution Approach 2:
The integrated circuit chip performs multiple functions simultaneously: it detects voltage levels across all lamps, samples current conditions, determines lamp operating states (normal, open circuit, short circuit), and controls the backlight scanning process. This multi-functional approach eliminates the need for separate protection transistors for each lamp while ensuring comprehensive protection.
2Adaptability or versatility
If the number of transistors is increased to accommodate more lamps, then the adaptability to different lamp configurations is improved, but the cost and device complexity increase
Solution Approach 1:
The integrated circuit chip is designed with universal functionality that can accommodate different numbers and configurations of lamps. The chip contains multiple detection channels and can adaptively monitor various lamp arrangements (single lamp, multiple lamps in series or parallel) without requiring additional transistors or circuit modifications, thus providing scalability and adaptability.
Solution Approach 2:
The protection circuit implements dynamic adaptation to different lamp configurations through software-controlled detection and control logic in the integrated chip. The system can dynamically adjust its monitoring and protection strategies based on the actual lamp configuration, enabling flexibility without increasing hardware complexity.
3Reliability
If additional electronic elements are added to protect each lamp, then the reliability of individual lamp protection is improved, but the manufacturing cost increases
Solution Approach 1:
The invention consolidates multiple protection functions that would traditionally require separate electronic components into a single integrated circuit chip. This integration reduces the total number of discrete electronic elements needed, simplifies assembly processes, and lowers manufacturing costs while maintaining comprehensive protection for all lamps.
Solution Approach 2:
Instead of using separate physical protection circuits for each lamp, the integrated chip uses software-based detection and control logic to provide protection functions. The chip virtually replicates protection capabilities across all lamps through digital signal processing and control algorithms, eliminating the need for duplicate hardware protection circuits.
Data Source
AI summary
An exemplary backlight control circuit (200) includes at least one load circuit (210), a pulse width modulation integrated circuit (250), and a micro controller (260). The micro controller includes an output terminal and a plurality of analog to digital input terminals. The output terminal outputs a high level signal when the analog to digital input terminals all receive high level signals, and the output terminal outputs a low level signal when any one of the analog to digital input terminals receives a low level signal. The micro controller feeds operating states of the at least one load circuit back to the pulse width modulation integrated circuit.