Display Device Switching Regulator Voltage Stability Control
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Solution Overview
Problem
Existing display devices with switching regulator type direct current power generating circuits face challenges in stabilizing output voltage, leading to voltage fluctuations and screen flickering due to inadequate adjustment of pulse width in response to changes in output voltage.
Innovation Solution
The display device incorporates an on period determination unit that adjusts the on period of the switching element by increasing or decreasing the pulse width monotonically when the detection code remains the same between consecutive cycles and differently when it changes, using a storage module to determine the on period based on previous cycles' information, thereby averaging the on period to achieve better stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pulse width is adjusted based on output voltage detection to stabilize voltage, then the output voltage stability is improved, but the response time and control precision deteriorate due to the coarse adjustment method
Solution Approach 1:
The patent segments the pulse width adjustment into two independent components: a base pulse width determined by the output voltage detection result, and a correction pulse width determined by the change point detection result. This segmentation allows the system to combine coarse adjustment (for stability) with fine adjustment (for precision), resolving the contradiction between voltage stability and control precision.
Solution Approach 2:
The patent introduces a change point detection mechanism as an intermediary that detects transitions in the detection code and generates correction signals. This intermediary component enables precise control by adding fine-grained adjustments to the base pulse width, thereby improving measurement precision without compromising voltage stability.
2Speed
If the on period is adjusted every cycle based on detection code, then the voltage control responsiveness is improved, but the output voltage fluctuation increases due to non-monotonic adjustments
Solution Approach 1:
The patent implements preliminary action by detecting change points in advance and storing correction pulse width values before they are needed. When a change point is detected, the corresponding correction value is retrieved and applied, ensuring smooth and monotonic pulse width adjustments. This preliminary detection and storage mechanism prevents abrupt non-monotonic changes, reducing output voltage fluctuation while maintaining control responsiveness.
Solution Approach 2:
The patent employs feedback mechanisms through both output voltage detection and change point detection. The system continuously monitors the detection code, identifies change points, and adjusts the pulse width accordingly. This dual feedback approach ensures that adjustments are both responsive to voltage changes and smooth in execution, resolving the contradiction between responsiveness and fluctuation.
3Speed
If the pulse width adjustment step is large to respond quickly to voltage changes, then the control speed is improved, but the voltage stability deteriorates due to overshoot and oscillation
Solution Approach 1:
The patent applies dynamics by making the pulse width adjustment adaptive rather than fixed. The base pulse width provides coarse adjustment for rapid response, while the correction pulse width provides fine-tuned adjustments based on change point detection. This dynamic two-stage adjustment mechanism allows the system to respond quickly to voltage changes while preventing overshoot and oscillation, thereby maintaining voltage stability.
Solution Approach 2:
The patent changes the pulse width parameter in two stages: first through base pulse width adjustment based on voltage detection, then through correction pulse width adjustment based on change point detection. This two-parameter change approach enables the system to achieve both fast control speed and high voltage stability by combining large initial adjustments with smaller refinements.
Data Source
AI summary
To provide a display device including a switching regulator type power generating circuit which realizes an increase in display quality by an output voltage being more stable, and by suppressing a flickering of a screen. A display device includes a switching regulator type direct current power generating circuit, wherein a period for which a switching element is turned on is determined in such a way as to increase or decrease by a given width when a code of an output voltage with respect to a setting voltage is constant, and the period is determined in such a way as to increase or decrease differently from the given width when the code changes.