Display Device Voltage Monitoring via Detection Lines
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Solution Overview
Problem
Current display devices face challenges in maintaining stability while reducing power consumption, as existing solutions like EP2722841A1 increase manufacturing costs by employing reference voltages.
Innovation Solution
A display device with a pixel array, power and ground lines, and a power supply circuit that detects and adjusts supply and ground voltages using power and ground detection lines to compensate for voltage drops, maintaining a desired voltage difference within a tolerance, thereby stabilizing the display device without increasing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a reference voltage is employed to reduce power consumption, then power consumption is reduced, but manufacturing costs increase
Solution Approach 1:
The display device monitors its own voltage levels using detection lines connected to the power supply circuit, which automatically adjusts voltages based on detected values. This self-monitoring and self-adjusting mechanism eliminates the need for external reference voltage components, reducing manufacturing costs while maintaining power efficiency
Solution Approach 2:
The power supply circuit receives detected voltage values from the pixel array through detection lines and uses this feedback information to dynamically adjust the supply voltage and ground voltage. This closed-loop feedback system enables automatic voltage compensation without requiring additional reference voltage components, resolving the contradiction between power reduction and manufacturing cost
2Reliability
If voltage detection and adjustment mechanisms are added to stabilize the display device, then stability is improved, but device complexity increases
Solution Approach 1:
The voltage detection function is merged into the existing power supply circuit by using the same circuit to both provide power and monitor voltage levels. The detection lines are integrated with the power supply network, allowing the power supply circuit to perform both power delivery and voltage monitoring functions, thereby improving stability without adding separate complex monitoring systems
Solution Approach 2:
The power supply circuit is designed to perform multiple functions: providing supply voltage to the pixel array, receiving voltage detection signals from the pixel array through detection lines, and automatically adjusting voltages based on detected values. This multi-functional design enhances stability while avoiding the need for dedicated monitoring components that would increase device complexity
Data Source
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AI summary
A display device (1) includes a pixel array (10), a power line (12), a ground line (14), at least one power detection line (16), at least one ground detection line (17), and a power supply circuit (18). The power supply circuit (18) is used to provide to the pixel array a supply voltage (VDD) via the power line (12) and a ground voltage (VSS) via the ground line (14), receive from the pixel array at least one detected supply voltage (VDDdet) via the at least one power detection line (16) and at least one detected ground voltage (VSSdet) via the at least one ground detection line (17), and adjust the supply voltage (VDD) and/or the ground voltage (VSS) according to the at least one detected supply voltage (VDDdet) and the at least one detected ground voltage (VSSdet).