Display Power Supply Feedback Control for Voltage Ripple Compensation
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Solution Overview
Problem
Existing display apparatuses experience output voltage ripples due to load transient conditions, which can lead to motion afterimages and degrade the quality of moving images.
Innovation Solution
A power supply system with an output controller that senses voltage output and generates compensation voltage values to offset output voltage ripples, thereby improving display quality by minimizing motion afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply drives the display panel, then the display panel can display images, but output voltage ripples occur causing motion afterimages
Solution Approach 1:
The output controller performs preliminary action by generating compensation voltage values in advance based on expected load transient conditions. When a load transient is detected, the pre-generated compensation voltage is immediately applied to offset the ripple, eliminating the need for reactive correction and reducing motion afterimages.
Solution Approach 2:
The output controller continuously monitors the output voltage and detects load transient conditions. Based on this feedback, the controller dynamically adjusts the compensation voltage values to counteract detected ripples, creating a closed-loop control system that maintains stable output voltage during display panel operation.
2Reliability
If compensation voltage values are generated to offset ripples, then motion afterimages are minimized, but device complexity increases
Solution Approach 1:
The output controller performs multiple functions: it monitors output voltage, detects load transient conditions, generates compensation voltage values, and applies corrections. By consolidating these functions into a single controller rather than separate circuits, the patent reduces overall device complexity while maintaining effective ripple compensation.
Solution Approach 2:
The output controller dynamically changes voltage parameters (compensation voltage values) based on detected load conditions. By adjusting voltage levels in response to load transients rather than using fixed voltage circuits, the system achieves adaptive ripple compensation without requiring complex hardware modifications.
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, a timing controller configured to control the display panel, and a power supply including an output circuit configured to generate an output power for supplying power to the display panel based on an input power, and an output controller configured to sense a voltage output through an output terminal of the output circuit to obtain a sensing value. The output controller provides a reference voltage value and compensation voltage values having levels which differ from a level of the reference voltage value, based on an external signal. Further, the output controller selectively outputs at least one of the reference voltage value and the compensation voltage values to provide a voltage value, based on the external signal, and generates a control signal for controlling the output circuit, based on the sensing value and the voltage value.