Display Burning Protection Circuit Overcurrent Detection
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Solution Overview
Problem
Flat panel display devices, such as LCDs and OLEDs, are vulnerable to burning or fire due to overcurrents caused by cracks or abnormal power supply voltage line shorts, as they use high currents and lack effective protection mechanisms.
Innovation Solution
A burning protection circuit is implemented in display devices, comprising current measuring units and a control unit that monitor currents supplied to pixel blocks through power supply lines, calculate ratios of measured currents to block data, and cut off power when an overcurrent is detected, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If flat panel display devices use high currents for operation, then display performance is improved, but vulnerability to burning or fire increases due to overcurrents
Solution Approach 1:
The protection circuit performs preliminary detection of overcurrent conditions before actual burning or fire can occur. Current measuring units continuously monitor the current supplied to pixel blocks, and the control unit proactively cuts off power when overcurrent is detected, preventing the harmful effect from materializing.
Solution Approach 2:
The protection circuit establishes a feedback mechanism where current measuring units provide real-time current information to the control unit, which compares measured current values against block data to detect overcurrent conditions. This closed-loop feedback enables continuous monitoring and immediate response to prevent burning or fire.
2Reliability
If protection mechanisms are added to detect and prevent overcurrents, then safety is improved, but device complexity increases
Solution Approach 1:
The protection circuit is segmented into distinct functional modules: current measuring units that monitor current in each pixel block, a control unit that processes the measurements, and power supply lines that can be independently controlled. This segmentation allows the protection function to be distributed and integrated into the existing display structure without requiring a complete system redesign.
Solution Approach 2:
The protection circuit acts as an intermediary layer between the power supply and the pixel blocks. The current measuring units and control unit serve as mediators that monitor and regulate current flow, enabling safety protection without directly modifying the pixel structure or display functionality.
3Measurement precision
If continuous monitoring of current is performed to detect overcurrents, then detection reliability is improved, but energy consumption increases
Solution Approach 1:
The protection circuit performs periodic current measurements and comparisons rather than continuous monitoring. The current measuring units measure current at regular intervals, and the control unit periodically compares measured values with block data to detect overcurrent conditions. This periodic operation maintains detection reliability while reducing energy consumption compared to truly continuous monitoring.
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
The solution effectively detects and prevents overcurrents, reducing the risk of burning or fire in display devices even during continuous operation without non-emission periods, ensuring the safety and reliability of the devices.
Implementation Method 1
a current sensing device configured to sense a corresponding one of the currents flowing through a corresponding one of the power supply lines, and generate a voltage corresponding to the corresponding one of the currents
Data Source
AI summary
A burning protection circuit of a display device includes a plurality of current measuring units and a control unit. The display device includes a plurality of pixel blocks. Each of the pixel blocks includes a plurality of pixels. The pixel blocks are respectively supplied with power through a plurality of power supply lines. The current measuring units are configured to respectively generate a plurality of measured current values by respectively measuring a plurality of currents respectively supplied to the pixel blocks through the power supply lines. The control unit is configured to respectively generate a plurality of block data for the pixel blocks based on pixel data for the pixels of corresponding ones of the pixel blocks, and determine whether an overcurrent occurs based on a plurality of ratios of the measured current values to corresponding ones of the block data.