Display Panel Scan Gating for Split-Screen Refresh Stability
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Solution Overview
Problem
Ensuring display quality in display panels with split-screen functionality, where different display partitions have varying refresh frequencies, is a challenge due to issues like scan signal cutoffs and voltage jumps.
Innovation Solution
A display panel design incorporating shift registers and gating circuits, controlled by control signal lines, allows for independent frequency management of display partitions by using overlapping primary scan signals and enabling/disabling gating circuits to maintain consistent and varied refresh frequencies across different areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a split-screen display function is implemented with different refresh frequencies in different display areas, then the display panel can show multiple operation interfaces simultaneously with optimized performance for each area, but scan signal cutoffs and voltage jumps occur affecting display quality
Solution Approach 1:
The display panel is divided into multiple display areas (first display area and second display area) with independent refresh frequency control. Each area can operate at different refresh frequencies (e.g., 90Hz or 120Hz for gaming areas, 60Hz for standard areas) through separate scan signal lines and control circuits, allowing optimized performance for different content types while maintaining overall system reliability.
Solution Approach 2:
The refresh frequency of each display area is made dynamically adjustable through control signals. The control circuit can switch between different refresh rates (60Hz, 90Hz, 120Hz) for different areas based on the displayed content requirements, enabling the system to adapt to varying performance needs while preventing signal cutoffs through coordinated control.
2Manufacturing precision
If adjacent shift registers output overlapping primary scan signals, then scan coverage is improved, but signal interference and display artifacts increase
Solution Approach 1:
Different timing and overlap characteristics are applied to different regions of the display panel. The scan signal generation is customized for each display area, with adjustable phase shifts and overlap durations tailored to the specific requirements of each region, reducing interference while maintaining comprehensive scan coverage.
Solution Approach 2:
The scan signals from adjacent shift registers are synchronized with periodic timing relationships. By controlling the phase and frequency of overlapping signals in a coordinated periodic manner, the system achieves complete pixel coverage while minimizing interference through predictable, repeating signal patterns that allow for proper timing margins.
3Adaptability or versatility
If gating circuits are used to control scan signal output for frequency management, then refresh frequency control is achieved, but device complexity increases
Solution Approach 1:
The gating circuits are designed with multi-functional capabilities, serving both as frequency control elements and as signal routing switches. The same gating circuitry is used across different display areas to provide both refresh rate modulation and scan signal distribution, reducing the need for separate control mechanisms and simplifying the overall circuit architecture.
Solution Approach 2:
Control signal lines act as intermediaries between the control circuit and the shift registers/gating circuits. These intermediary signals coordinate the operation of multiple gating circuits across different display areas, enabling centralized frequency management while distributing control efficiently throughout the display panel without requiring complex direct connections between all components.
Data Source
AI summary
Display panel and display device are provided. The display panel includes a plurality of shift registers in cascade, for generating primary scan signals, primary scan signals output by adjacent shift registers overlapping; a plurality of gating circuits, electrically connected to the plurality of shift registers in a one-to-one correspondence, for generating scan signals, a frequency of a scan signal of the scan signals being less than or equal to a frequency of a primary scan signal of the primary scan signals; control signal lines, including a first control signal line; and a plurality of shift register areas, each of the plurality of shift register areas comprising at least one shift register.