Scan Driver Timing Control for Display Device MPRT
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Solution Overview
Problem
Conventional scan drivers for display devices double the frame period by alternately repeating image display and black display periods, leading to inefficiencies in motion picture response time (MPRT).
Innovation Solution
A display device design where scan signals are sequentially applied during the image display period and simultaneously applied during the black display period, utilizing active stages with specific output circuits and timing control to manage scan and carry clock signals, ensuring different intervals for scan clock signals and maintaining signal integrity across both periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If scan signals are sequentially applied to scan lines during image display period and black display period alternately repeated, then motion picture response time is improved, but frame period is doubled
Solution Approach 1:
The frame period is segmented into distinct image display periods and black display periods, with scan signals being sequentially applied during image display periods and simultaneously applied during black display periods. This segmentation allows the system to optimize scanning behavior for each period type, improving motion picture response time while managing frame period duration through structured time division.
Solution Approach 2:
The scan driver dynamically changes its operation mode between sequential scanning during image display periods and simultaneous scanning during black display periods. This dynamic adaptation allows the system to achieve improved motion picture response time by utilizing different scanning strategies appropriate for each period type, rather than maintaining a fixed scanning mode throughout the entire frame period.
2Duration of action of moving object
If scan signals are simultaneously applied to scan lines during black display period, then frame period is reduced, but signal timing complexity increases
Solution Approach 1:
The scan driver acts as an intermediary component that manages the complex timing requirements for simultaneous scan signal application during black display periods. By centralizing the timing control function in the scan driver, the system can achieve reduced frame period while containing signal timing complexity within a dedicated control unit rather than distributing it throughout the entire display system.
Solution Approach 2:
The scan driver employs periodic action by alternating between sequential scanning during image display periods and simultaneous scanning during black display periods. This periodic switching between different scanning modes allows the system to reduce overall frame period while managing timing complexity through regular, predictable pattern repetition rather than requiring complex arbitrary timing sequences.
Data Source
AI summary
A display device includes: active stages each include a scan output circuit outputting a scan clock signal to a first output terminal and a carry output circuit outputting a carry clock signal to a second output terminal, when a voltage of a first node is at a logic high level. The scan output circuit and carry output circuit output a scan signal of a turn-off level to the first output terminal when a voltage of a second node or a carry signal is at a logic high level. An interval between pulses of the carry clock signal generated during one frame period is the same, and at least two of intervals between pulses of the scan clock signal generated during the one frame period are different from each other.