Display Driver Frequency Synchronization Control
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Solution Overview
Problem
Conventional liquid crystal display (LCD) drivers face issues with display data output due to variations in internal oscillator frequency caused by external factors like temperature and voltage, leading to incomplete frame refresh and display errors.
Innovation Solution
A display driving device and method that includes a host and a driving chip with a control circuit to detect and compare the target frequency of a synchronization signal with the timing generator frequency, outputting an adjustment value to dynamically adjust the timing generator frequency, ensuring accurate frame display by maintaining or adjusting the frequency based on the comparison.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed timing generator frequency is used in the LCD driver, then the device structure is simple and easy to manufacture, but the display accuracy deteriorates due to frequency variations caused by temperature and voltage changes
Solution Approach 1:
The patent implements dynamic frequency adjustment by comparing the actual oscillator frequency with the target frequency and automatically adjusting the timing generator frequency accordingly. This transforms the fixed frequency system into a dynamic one that adapts to environmental changes, resolving the contradiction between manufacturing simplicity and display accuracy.
Solution Approach 2:
The patent introduces a feedback mechanism where the control circuit continuously monitors the actual frequency of the oscillator and compares it with the target frequency. Based on this feedback, the system automatically adjusts the timing generator frequency to maintain synchronization, thereby improving display accuracy without significantly increasing device complexity.
2Reliability
If the oscillator frequency varies due to external factors, then the device operates in simple environmental conditions, but the display reliability deteriorates due to incomplete frame refresh
Solution Approach 1:
The control circuit continuously monitors the actual oscillator frequency and compares it with the target frequency, then adjusts the timing generator frequency accordingly. This feedback mechanism compensates for frequency variations caused by temperature and voltage changes, maintaining display reliability under varying environmental conditions.
Solution Approach 2:
The patent changes the timing generator frequency parameter dynamically based on the actual oscillator frequency. By adjusting this critical parameter in response to environmental variations, the system maintains synchronous operation between the host and display driver, ensuring reliable display performance.
3Manufacturing precision
If the timing generator frequency is adjusted dynamically, then the display accuracy is improved, but the use of energy increases due to additional control operations
Solution Approach 1:
The frequency adjustment is performed only when necessary - specifically when the actual oscillator frequency deviates from the target frequency. The control circuit compares frequencies and applies adjustment only when the comparison indicates a discrepancy, avoiding unnecessary energy-consuming operations while maintaining display accuracy.
Data Source
AI summary
A display driving device and a method for driving a display are provided. The display driving device includes a host and a driving chip. The host transmits an image data and a synchronization signal. The driving chip receives the image data and the synchronization signal and drives a display panel to display frames. The driving chip includes a storage unit, a driving module, and a control circuit. The storage unit stores the image data. The driving module drives the display panel to display the frames according to the image data from the host and a timing generator frequency of the driving module. The control circuit detects a target frequency of the synchronization signal and the timing generator frequency of the driving module, compares the target frequency and the timing generator frequency, outputs an adjustment value according to the comparison result, and adjusts the timing generator frequency of driving module.