Display Oscillator Jitter Correction for Panel Noise Reduction
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Solution Overview
Problem
Existing display devices suffer from panel noise that degrades display quality, necessitating improved noise reduction techniques.
Innovation Solution
A display device incorporating a jitter correction circuit that adjusts oscillator power based on calculated jitter to improve display quality by reducing panel noise, utilizing a frequency locked loop (FLL) to generate an oscillator signal and employing time-to-digital converters (TDC) to measure pulse widths and correct jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oscillator operates at high power to maintain signal stability, then the reliability of the gate clock signal is improved, but the jitter of the oscillator signal increases causing panel noise
Solution Approach 1:
The jitter correction circuit continuously monitors the oscillator signal and adjusts the output power in real-time based on detected jitter levels. When jitter exceeds a threshold, the circuit reduces power to minimize noise; when jitter is within acceptable range, the circuit increases power to maintain signal stability. This closed-loop feedback mechanism dynamically balances reliability and noise reduction.
Solution Approach 2:
The system dynamically changes the output power parameter of the oscillator based on jitter conditions. By adjusting this critical parameter, the system can operate at high power when signal stability is prioritized and at low power when noise reduction is prioritized, thus resolving the contradiction between reliability and harmful factors.
2Object-generated harmful factors
If the oscillator power is reduced to minimize panel noise, then the harmful factors are decreased, but the signal stability and reliability deteriorate
Solution Approach 1:
The jitter correction circuit introduces dynamic control to the oscillator power, transitioning from a static fixed-power operation to a dynamic adjustable-power operation. The circuit continuously adapts the power level based on real-time jitter measurements, allowing the system to optimize the balance between noise reduction and signal stability under varying operating conditions.
Solution Approach 2:
The system employs feedback control where the jitter correction circuit monitors the oscillator signal quality and adjusts power accordingly. This feedback mechanism ensures that power is reduced only when necessary to minimize noise, while maintaining sufficient power levels to preserve signal stability, thus resolving the contradiction between reducing harmful factors and maintaining reliability.
3Ease of manufacture
If a simple oscillator is used to reduce device complexity, then the ease of manufacture is improved, but the jitter correction capability and display quality deteriorate
Solution Approach 1:
The jitter correction circuit acts as an intermediary component between the simple oscillator and the display panel. This mediator processes the oscillator signal, corrects jitter, and conditions the signal before it reaches the panel, thereby enabling a simple oscillator to achieve high display quality without increasing overall device complexity significantly.
Solution Approach 2:
The system segments the signal processing function into a separate jitter correction circuit module. This modular approach allows the oscillator itself to remain simple and easy to manufacture, while the jitter correction functionality is isolated in a dedicated circuit that can be independently optimized and integrated, thus resolving the contradiction between ease of manufacture and display quality.
Data Source
AI summary
A display device can include a display panel configured to display an image, a driving circuit including an oscillator for generating an oscillator signal having a preset frequency and configured to generate a gate clock signal to drive the display panel based on the oscillator signal, and a jitter correction circuit configured to calculate a jitter of the oscillator signal based on an externally input reference frequency signal and the oscillator signal and control output power of the oscillator depending on a calculation result to correct the jitter of the oscillator signal.