Display Clock Frequency Adjustment for Temperature-Stable Drive Signals
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Solution Overview
Problem
Display devices, particularly AMOLEDs, face issues with abnormal flashing due to temperature-induced fluctuations in clock signal frequencies, which affect the stability of drive signals and result in poor display performance, as existing calibration methods fail to maintain consistent frequencies during usage.
Innovation Solution
A method and apparatus for adjusting the frequency of the clock signal by acquiring and comparing the number of times a reference signal is output within a reference duration, determining a target adjustment value based on differences from a reference number of times, and controlling the clock signal generator's input voltage to adjust the frequency, ensuring stable signal transmission and normal display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock signal frequency is adjusted to compensate for temperature variations, then the display stability is improved, but the device complexity increases due to additional frequency adjustment mechanisms
Solution Approach 1:
The system uses the reference signal output count itself as the measurement indicator for frequency deviation. By counting how many times the reference signal outputs within a fixed duration, the system self-detects frequency changes without needing external temperature sensors or complex frequency measurement circuits. This self-service approach maintains display stability while avoiding additional hardware complexity.
Solution Approach 2:
The system establishes a feedback loop where the counted reference signal outputs are compared against expected values, and the resulting difference information is used to adjust the clock signal frequency. This closed-loop feedback mechanism automatically compensates for temperature-induced frequency drift, improving display stability without requiring manual intervention or complex control systems.
2Reliability
If temperature detection circuits are added to monitor and adjust clock frequency, then the display performance consistency is improved, but the manufacturing cost increases
Solution Approach 1:
The reference signal acts as an intermediary that indirectly reflects temperature effects on the clock signal. Instead of directly measuring temperature or frequency with specialized sensors, the system uses the reference signal output count as a mediator that translates temperature-induced frequency changes into a measurable quantity. This approach achieves temperature compensation functionality without requiring actual temperature detection circuits, thereby reducing manufacturing costs.
Solution Approach 2:
The patent replaces physical temperature detection circuits with a signal-processing-based frequency measurement approach. By substituting hardware temperature sensors with a method that counts reference signal outputs, the system achieves the same compensation effect using existing signal processing capabilities, thereby simplifying manufacturing and reducing component costs.
3Speed
If the reference duration is shortened to enable faster frequency adjustment, then the response speed is improved, but the measurement precision deteriorates due to fewer reference signal cycles
Solution Approach 1:
The system uses a fixed reference duration that is sufficient to capture enough reference signal cycles for accurate measurement, rather than dynamically adjusting the duration based on speed requirements. By accepting a moderate response time, the system ensures that enough cycles are counted to maintain measurement precision. The reference duration is chosen to be long enough for accuracy but not so long that it becomes unnecessarily slow.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively adjusts the clock signal frequency to maintain stable drive signal transmission, preventing abnormal flashing and ensuring consistent display performance across varying temperatures without the need for additional temperature detection circuits, thus reducing costs and improving display quality.
Implementation Method 1
adjusting an amplitude of an input voltage supplied to the clock signal generator based on the target adjustment value, so that the clock signal generator is capable of adjusting the frequency of the clock signal under the adjusted input voltage
Data Source
AI summary
A method for adjusting the signal frequency includes: acquiring a first number of times of outputting a reference signal at an active level within a reference duration, wherein a correlation between a frequency of the reference signal and temperature is less than a reference correlation threshold, the reference duration is negatively correlated with a frequency of a clock signal, a correlation between a frequency of a clock signal and temperature is greater than the reference correlation threshold, and a drive signal for driving a display device to display an image is generated based on the clock signal; acquiring a target adjustment value based on the first number of times if the first number of times is different from a reference number of times; and controlling and adjusting the frequency of the output clock signal based on the target adjustment value.