Display Driving Device Sync Signal Generator Adjusts Horizontal Period
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Solution Overview
Problem
Display driving devices experience brightness deviations due to insufficient horizontal periods for data input, particularly in organic electroluminescent displays, when using timing signals from external processors, leading to incomplete data scanning and display panel brightness issues.
Innovation Solution
A display driving device with a sync signal generator that adjusts the horizontal sync signal period to ensure sufficient time for data input, using a buffer to store data for unscanned gate lines and generating new vertical and horizontal sync signals based on operating conditions to match the display panel's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the horizontal sync signal period from the external processor is used directly, then the device complexity is reduced, but the brightness uniformity deteriorates due to insufficient data input time
Solution Approach 1:
The sync signal generator dynamically adjusts the horizontal sync signal period based on the porch period duration. When the porch period exceeds a reference value, the generator extends the horizontal period to ensure sufficient data input time, thereby maintaining brightness uniformity while adapting to different operating conditions rather than using a fixed timing signal
2Stability of the object's composition
If the horizontal sync signal period is extended to ensure sufficient data input time, then the brightness uniformity is improved, but the productivity deteriorates due to longer scanning time
Solution Approach 1:
The horizontal sync signal period is extended only partially and conditionally - specifically when the porch period exceeds a reference value. This partial extension provides just enough additional time for data input to ensure brightness uniformity without unnecessarily prolonging the scanning period in all cases, thus maintaining optimal productivity
3Stability of the object's composition
If the sync signal generator adjusts the horizontal period dynamically, then the brightness uniformity is improved, but the device complexity increases due to additional signal generation circuitry
Solution Approach 1:
The sync signal generator changes the temporal parameter (horizontal period duration) of the sync signal based on the porch period measurement. By dynamically adjusting this single parameter rather than adding complex control logic, the system achieves brightness uniformity with minimal additional complexity
Data Source
AI summary
A display driving device includes an interface, a clock generator, a sync signal generator and a timing controller. The interface receives a first vertical sync signal having a first vertical period, a first horizontal sync signal having a first horizontal period shorter than the first vertical period, and image data. The clock generator generates a clock signal having a predetermined frequency. The sync signal generator generates a second vertical sync signal using the first vertical sync signal, and generates a second horizontal sync signal having a second horizontal period different from the first horizontal period, using the clock signal, when a porch period included in the first vertical period is greater than a predetermined reference value. The timing controller drives a display panel based on the second vertical sync signal and the second horizontal sync signal.