Display Driving Circuit With Adaptive Clock Frequency Alignment
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Solution Overview
Problem
Existing display devices face challenges in efficiently adjusting the frequency of clock signals to match target frequencies due to environmental changes and operational conditions, leading to potential screen abnormalities such as luminance changes, crosstalk, and flicker.
Innovation Solution
A display driving circuit that includes a frequency variation determiner, calculator, and controller to adaptively adjust the clock signal frequency based on deviations from a reference frequency, using a stepwise approach to minimize the time required to reach the target frequency, thereby reducing screen abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock signal frequency is adjusted to match the target frequency, then display stability is improved, but the time required to reach the target frequency increases
Solution Approach 1:
The patent implements dynamic frequency adjustment by adaptively changing the frequency variation amount based on the current frequency deviation from the target frequency. The frequency variation amount is determined dynamically rather than being fixed, allowing the system to optimize both convergence speed and stability during the frequency adjustment process.
Solution Approach 2:
The patent employs a feedback mechanism where the frequency deviation is continuously monitored and used to determine the appropriate frequency variation amount. The frequency variation determiner receives the frequency deviation information and adjusts the frequency variation amount accordingly, creating a closed-loop control system that balances adjustment speed and stability.
2Loss of time
If the frequency variation amount is increased to reduce adjustment time, then the time to reach target frequency is reduced, but screen abnormalities such as luminance changes and flicker increase
Solution Approach 1:
The frequency variation amount is made dynamic and adaptive rather than fixed. The system determines the frequency variation amount based on the current frequency deviation, allowing larger variations when far from target (reducing adjustment time) and smaller variations when close to target (reducing screen abnormalities).
Solution Approach 2:
The patent changes the parameter of frequency variation amount based on the frequency deviation condition. By adjusting this parameter dynamically according to the system state, the patent optimizes the balance between adjustment speed and display quality throughout the frequency adjustment process.
3Object-affected harmful factors
If the frequency variation amount is decreased to reduce screen abnormalities, then screen stability is improved, but the time required to reach target frequency increases
Solution Approach 1:
The system dynamically adjusts the frequency variation amount based on real-time frequency deviation measurements. This allows the system to use larger variation amounts when needed (reducing adjustment time) and smaller amounts when necessary (reducing screen abnormalities), optimizing both parameters throughout the adjustment process.
Solution Approach 2:
The patent applies partial frequency variation amounts selectively based on the adjustment stage. When the frequency deviation is large, excessive action (larger frequency variation) is applied to reduce adjustment time. When the deviation is small, partial action (smaller frequency variation) is applied to minimize screen abnormalities, achieving optimal balance at different stages.
4Reliability
If adaptive frequency adjustment is implemented, then display stability under varying conditions is improved, but device complexity increases
Solution Approach 1:
The frequency variation determiner is designed to perform multiple functions: it receives frequency deviation information, determines appropriate frequency variation amounts, and outputs control signals. This multi-functional component reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving adaptive frequency adjustment.
Solution Approach 2:
The system performs self-adjustment by automatically determining the frequency variation amount based on the measured frequency deviation. The frequency variation determiner autonomously selects the appropriate adjustment parameter without requiring external intervention or complex control logic, reducing the overall system complexity while maintaining adaptive capability.
Data Source
AI summary
A display driving circuit includes a clock signal generator which generates a clock signal at a frequency in response to a frequency control signal, a frequency variation determiner which adaptively changes a frequency variation of the clock signal, based on a magnitude of a deviation between the frequency of the clock signal and a target frequency calculated based on a reference clock signal supplied from the outside, and a frequency controller which generates the frequency control signal which updates the frequency of the clock signal, based on the frequency variation, and provides the frequency control signal to the clock signal generator.