Patterned Resistance Detection Circuit for Temperature-Stable Display Panels
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting resistance changes in display panels due to damage or cracks, which can lead to faults, and current methods require large circuit areas and are prone to accuracy issues due to temperature variations.
Innovation Solution
A patterned resistance detection circuit using a reference current and voltage system, comprising a current source generator, reference voltage generator, comparator, and circuit controller, to compare detection voltages with reference voltages, adjusting the reference voltage based on comparison results to maintain accuracy and reduce circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If variable resistance value method is used for resistance detection, then resistance detection can be performed, but circuit area increases due to large internal resistors and variable switches
Solution Approach 1:
The patent replaces the mechanical/electrical variable resistance system with an electrostatic capacitance-based detection system. Instead of using physical variable resistors and switches, the invention uses a detection electrode that forms a capacitor with the display panel surface, where changes in surface resistance are converted to changes in capacitance. This substitution eliminates the need for large-area internal resistors and variable switches, significantly reducing circuit area while maintaining resistance detection capability.
2Measurement precision
If traditional resistance detection method is used, then resistance can be measured, but detection accuracy decreases due to temperature variations
Solution Approach 1:
The patent introduces electrostatic capacitance as an intermediary parameter between the resistance detection goal and the actual measurement. Instead of directly measuring resistance which is temperature-sensitive, the system measures capacitance changes caused by resistance variations on the display panel surface. The detection electrode forms a capacitor where the capacitance value changes in response to surface resistance changes, providing a temperature-stable measurement pathway that indirectly achieves resistance detection with improved accuracy.
3Measurement precision
If variable switches are used for resistance detection control, then detection can be performed, but current distortion occurs due to channel length modulation
Solution Approach 1:
The patent replaces the switch-based control mechanism with a capacitive coupling mechanism. Instead of using variable switches that suffer from channel length modulation and current distortion, the system uses a detection electrode that capacitively couples the detection circuit to the display panel surface. This allows control and measurement without direct current flow through switches, eliminating channel length modulation effects and ensuring stable, distortion-free current characteristics.
Data Source
AI summary
A patterned resistance detection circuit according to an aspect of the present invention comprises: a current source generator which generates a reference current and applies same to a patterned resistance; a reference voltage generator which generates a reference voltage by using a plurality of resistors and a plurality of switches; a comparator which compares the magnitude of a detection voltage detected by the reference current applied to the patterned resistance with the magnitude of the reference voltage and outputs a voltage comparison result; and a circuit controller which outputs a reference voltage control signal for controlling the plurality of switches according to the voltage comparison result.