Display Gate Driver Clock Feedback for Jitter Flicker Control
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Solution Overview
Problem
Display apparatuses suffer from flicker issues due to noise or jitter in the clock signal affecting luminance and display quality, which are not adequately addressed by existing technologies.
Innovation Solution
A display apparatus with a jitter correction circuit that includes a jitter detection circuit, a jitter selection circuit, a jitter integral circuit, and a jitter comparison circuit to correct the jitter in the clock signal, ensuring stable and reliable driving of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a clock signal is used to drive the gate driver, then the display panel can be driven at a specific frequency, but jitter in the clock signal causes flicker and degrades display quality
Solution Approach 1:
The patent implements a feedback mechanism where the clock signal is fed back to a jitter correction circuit that compares it with a reference oscillator signal. The jitter correction circuit detects phase differences and generates correction signals to adjust the clock signal frequency, thereby eliminating jitter while maintaining the desired driving frequency.
Solution Approach 2:
The patent dynamically adjusts the frequency parameter of the clock signal by comparing it with a reference oscillator and generating correction signals. This allows the system to maintain a stable frequency while compensating for jitter, effectively changing the frequency parameter in real-time to optimize display quality.
2Speed
If oscillator noise is accumulated in the clock signal, then the clock signal can maintain its frequency, but the accumulated noise adversely affects luminance and display quality
Solution Approach 1:
The patent extracts and removes the harmful jitter and noise components from the clock signal by comparing it with a clean reference oscillator signal. The jitter correction circuit identifies and eliminates the accumulated noise while preserving the essential frequency information needed for driving the display panel.
Solution Approach 2:
The patent converts the harmful effect of accumulated noise into a beneficial correction mechanism. By detecting the jitter through feedback comparison, the system generates correction signals that transform the noise problem into an opportunity for frequency optimization and display quality enhancement.
3Reliability
If a jitter correction circuit is added to correct clock signal jitter, then driving stability is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the jitter correction functionality with the existing clock signal generation and distribution infrastructure. The feedback loop integrates with the gate driver circuitry, allowing jitter correction to be implemented without requiring completely separate systems, thereby reducing overall complexity.
Solution Approach 2:
The jitter correction circuit is designed to serve multiple functions: it corrects jitter, maintains frequency stability, and provides feedback control for the entire clock distribution system. This multi-functionality reduces the need for additional dedicated circuits, thereby managing complexity while enhancing reliability.
Data Source
AI summary
A display apparatus can include a display panel configured to display an image, a gate driver configured to apply a gate signal to the display panel, a driving circuit, and a jitter correction circuit. The driving circuit includes a signal generating circuit configured to generate a clock signal for driving the gate driver, and a frequency generating circuit configured to generate an internal oscillator signal to allow the clock signal to be generated with an internally set frequency band. The jitter correction circuit can correct a jitter of the clock signal, based on the internal oscillator signal and the clock signal fed back from the signal generating circuit.