Display Driving Controller Frequency Adaptation
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Solution Overview
Problem
Organic light emitting display devices face instability in operating frequency changes, leading to variations in image signal frequencies, which affect display performance and luminance consistency.
Innovation Solution
A driving controller with a memory, scan signal generator, and multiplexer that adjusts the output image signal frequency by storing input image signals and generating internal scan signals, allowing for stable operation across varying input image signal frequencies, including the use of vertical synchronization signals to manage scan and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device operates with varying input image signal frequencies, then the display can adapt to different content requirements, but the operating stability and luminance consistency deteriorate
Solution Approach 1:
The display device dynamically adjusts its operating frequency to match the input image signal frequency. The controller modifies the scan signal frequency and data signal timing based on the detected input frequency, allowing the system to adapt to different content requirements (e.g., 60Hz for standard video, 120Hz for high-speed content) while maintaining stable operation at each frequency point
Solution Approach 2:
The system changes key operating parameters including scan signal frequency, data signal frequency, and emission timing based on the input image signal frequency. By adjusting these parameters dynamically, the display maintains optimal performance and luminance consistency across different operating frequencies
2Speed
If the scan signal frequency is increased to match higher input frequencies, then the display can handle high-speed content, but the luminance consistency and image quality deteriorate
Solution Approach 1:
The display employs periodic emission control where the emission signal is activated only during specific time periods within each frame cycle. By adjusting the emission timing and duration based on the operating frequency, the system maintains consistent luminance output whether operating at 60Hz or 120Hz, preventing luminance degradation at higher scan speeds
Solution Approach 2:
The emission timing is dynamically adjusted based on the operating frequency. At higher scan frequencies, the emission window is optimized to ensure sufficient charge accumulation in the light-emitting elements while maintaining luminance consistency with lower frequency operation
3Productivity
If the data signal frequency is adjusted to match varying input frequencies, then the display can process different content rates, but the signal synchronization and image stability deteriorate
Solution Approach 1:
The controller detects the input image signal frequency and uses this information to adjust the data signal frequency and timing. This feedback mechanism ensures that the data signal remains properly synchronized with the scan signals and frame structure, maintaining image stability while processing content at different rates
Solution Approach 2:
The display system is designed to universally handle multiple input frequencies by implementing a flexible timing architecture. The same hardware infrastructure supports both 60Hz and 120Hz operation through dynamic timing adjustment, ensuring signal synchronization across different content requirements
Data Source
AI summary
A driving controller of a display device includes a memory that stores an input image signal in response to a control signal, a scan signal generator outputs an internal scan signal in response to the control signal, and a multiplexer outputs one of the input image signal and a storage image signal as an output image signal in response to the control signal and the internal scan signal. The storage image signal is provided from the memory, and the memory outputs the storage image signal in response to the internal scan signal.