Display Device Overcurrent Protection via Dynamic Voltage Control
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Solution Overview
Problem
Display panels are vulnerable to damage from overcurrent, which existing technologies fail to adequately prevent, leading to potential burnout and reduced lifespan.
Innovation Solution
A display device incorporating a current compensation circuit, data driver, current sensing circuit, voltage generator, and voltage control circuit to manage and regulate the driving current, ensuring it does not exceed safe limits by adjusting gamma reference voltage and data driving voltage based on sensed currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving current is increased to improve display performance and brightness, then the luminance and visibility are improved, but the risk of overcurrent damage to the display panel increases
Solution Approach 1:
The patent implements a feedback mechanism where a current sensing circuit continuously monitors the driving current and compares it with a reference current. When overcurrent is detected, a protection signal is generated and fed back to the voltage control circuit, which adjusts the driving voltage to reduce the current to safe levels, thus preventing damage while maintaining optimal display performance
Solution Approach 2:
The patent employs dynamic voltage adjustment through the voltage control circuit that modifies the driving voltage in real-time based on the sensed current conditions. This dynamic control allows the system to adapt the luminance output to match safe current operating ranges, preventing overcurrent damage while maintaining display quality
2Reliability
If existing protection mechanisms are added to prevent overcurrent damage, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuits: the current sensing circuit is merged with the voltage control circuit, and both work together with the data driver in a coordinated protection system. This integration reduces the need for separate discrete protection components, managing complexity while providing comprehensive overcurrent protection
Solution Approach 2:
The protection system operates autonomously through self-monitoring and automatic correction. The current sensing circuit automatically detects overcurrent conditions and triggers the voltage control circuit to adjust driving voltages without external intervention, providing reliable protection while minimizing the need for additional control logic or manual protection mechanisms
Data Source
AI summary
A display device including: a display panel; a current compensation circuit executing a current compensation operation in which a load is calculated based on input image data, and output compensation image data is generated by compensating for the input image data based on the load; a data driver converting the compensation image data into a data voltage based on a gamma reference voltage and a data driving voltage, and outputting the data voltage; a current sensing circuit sensing a driving current of the display panel and comparing the driving current with a preset reference current to output a protection signal; a voltage generator generating a driving voltage, the gamma reference voltage, and the data driving voltage; and a voltage control circuit generating a first voltage control signal to control a first target compensation value of the gamma reference voltage or the data driving voltage in response to the protection signal.