Display Device Virtual Feedback Voltage Compensation
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Solution Overview
Problem
Display devices face issues with luminance imbalance and color variation due to voltage drops across the display panel, which are difficult to address effectively with existing feedback mechanisms, especially in terms of cost and timing delays.
Innovation Solution
A display device with a feedback system that generates a virtual feedback voltage based on the high potential power voltage, allowing the power source to adjust the output voltage without measuring voltage drops at each location, thereby minimizing delays and costs associated with feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If actual feedback on high potential power voltage is implemented by measuring voltage at each location, then luminance imbalance and color variation are improved, but device complexity and cost increase due to additional wiring and circuits
Solution Approach 1:
The patent creates a virtual copy of the feedback signal by generating a virtual feedback voltage that mimics the actual voltage at the display panel inlet. Instead of physically measuring voltage at multiple locations and transmitting those signals back, the system copies the essential feedback information through calculation based on known parameters (current, resistance values) and outputs a virtual feedback voltage that serves the same control purpose, thereby eliminating complex wiring and measurement circuits
Solution Approach 2:
The patent introduces an intermediary computational approach where the feedback part calculates the virtual feedback voltage based on the relationship between current, resistance, and voltage. This intermediary calculation layer replaces direct physical measurement and transmission, acting as a mediator that transforms complex physical measurements into a simplified virtual signal that achieves the same control objective without the hardware complexity
2Manufacturing precision
If actual feedback measurement is implemented, then voltage drop compensation is improved, but time delay increases due to measurement and signal transmission
Solution Approach 1:
The patent performs preliminary action by pre-calculating the virtual feedback voltage based on known resistance values and current measurements before the actual voltage drop occurs in the power delivery network. The feedback part uses the relationship V=IR to compute what the voltage will be at the panel inlet, allowing the power source to adjust proactively rather than reactively to voltage drops, thereby minimizing timing delays
Solution Approach 2:
The patent replaces the mechanical/physical measurement system (voltage sensors, wiring, signal transmission) with a computational/electrical calculation system. Instead of physically measuring voltage and transmitting the signal through wires (which introduces delay), the system uses electrical calculations based on current and resistance to generate the feedback voltage instantaneously, substituting physical measurement with mathematical computation
3Device complexity
If feedback mechanisms are simplified to reduce cost, then device complexity is reduced, but luminance imbalance and color variation worsen
Solution Approach 1:
The patent creates a virtual copy of the feedback signal that contains all necessary information for accurate voltage drop compensation without requiring physical measurement infrastructure. The virtual feedback voltage is calculated to accurately represent the voltage conditions at the display panel inlet, maintaining color consistency and luminance balance while using only simple wiring and calculation circuits instead of complex measurement and transmission systems
Data Source
AI summary
A display device can include a display panel including a plurality of subpixels; a feedback part; and a power source configured to output a first power voltage to the feedback part and the display panel, in which the feedback part is configured to output a virtual feedback voltage to the power source, the virtual feedback voltage being based on the first power, and the power source is further configured to adjust a magnitude of the first power voltage to generate an adjusted first power voltage based on the virtual feedback voltage.