Timing Controller Start Signal Adjustment for Seamless HMD Mode Switching
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Solution Overview
Problem
Display devices, particularly Head-Mounted Displays (HMDs), experience image disconnection and luminance deterioration during mode switching between different driving conditions, leading to poor display quality.
Innovation Solution
A display device with a timing controller that generates a start signal based on a vertical synchronization signal, allowing seamless image display by adjusting the timing of scan signals during mode switching, including a first mode and a low persistence mode, by optimizing the generation and delivery of scan signals across different frame periods and synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display device operates in high frequency mode to keep up with head movements, then reactivity is improved, but image disconnection and luminance deterioration occur during mode switching
Solution Approach 1:
The timing controller generates a start signal before the vertical synchronization signal pulse is applied in the second mode, preparing the scan driver in advance. This preliminary action ensures that the scan signal is ready to be provided continuously without interruption during mode switching, preventing image disconnection while maintaining high refresh frequency for reactivity.
2Adaptability or versatility
If mode switching is performed between different driving conditions, then adaptability is improved, but image disconnection and luminance deterioration occur
Solution Approach 1:
The timing controller dynamically adjusts the timing of start signal generation based on the operating mode. In the first mode, the start signal is generated after the vertical synchronization signal pulse, while in the second mode, it is generated before the pulse. This dynamic adaptation allows seamless mode switching without image disconnection or luminance deterioration, maintaining display quality across different driving conditions.
3Productivity
If the frame period is reduced in the second mode, then productivity is improved, but timing synchronization becomes more critical
Solution Approach 1:
By generating the start signal before the vertical synchronization signal pulse in the second mode, the timing controller ensures that the scan driver is prepared in advance. This preliminary action provides sufficient time for the scan signal to be generated and transmitted even with the reduced frame period, maintaining timing precision and preventing display artifacts despite the increased refresh rate.
Data Source
AI summary
Systems and methods are provided for a display device that includes a display unit. The display unit includes scan lines and pixels coupled to the scan lines. A timing controller operates in a first mode and a second mode and generates a start signal, based on a vertical synchronization signal provided from the outside. A scan driver generates a scan signal, based on the start signal, and sequentially provides the scan signal to the scan lines. The timing controller generates the start signal immediately after a pulse of the vertical synchronization signal is applied in the first mode, and generates the start signal before a pulse the vertical synchronization signal is applied in the second mode.