Scan Driver Pulse Width Control for Low-Power Still-Image Displays
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption without compromising display quality, particularly when displaying still images.
Innovation Solution
A display device with a scan driver that includes multiple stages outputting scan signals with varying pulse widths, utilizing a compensation circuit with an inverter and multiplexer circuit to adjust scan signal pulse widths, and operating in multiple modes to dynamically balance power efficiency and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the operating frequency of the display device is lowered to reduce power consumption, then power consumption is reduced, but display quality may deteriorate
Solution Approach 1:
The scan driver dynamically adjusts the pulse width of scan signals based on the operating mode (first mode for moving images, second mode for still images). When displaying still images at lower frequencies, the pulse width is extended to ensure sufficient charging time for pixel circuits, thereby maintaining display quality while operating at reduced power consumption levels.
Solution Approach 2:
The invention changes the temporal parameter (pulse width) of the scan signal to compensate for the reduced operating frequency. By extending the pulse width at lower frequencies, the system ensures that pixel circuits receive adequate charge even when the display operates at reduced power consumption modes, thus resolving the contradiction between power efficiency and display quality.
2Use of energy by stationary object
If the operating frequency is reduced for power savings, then energy efficiency improves, but the charging time for pixel circuits becomes insufficient
Solution Approach 1:
The scan driver dynamically adjusts the pulse width of scan signals based on the operating mode. When displaying still images at lower frequencies, the pulse width is extended to ensure sufficient charging time for pixel circuits, thereby maintaining display quality while operating at reduced power consumption levels.
Solution Approach 2:
The invention changes the temporal parameter (pulse width) of the scan signal to compensate for the reduced operating frequency. By extending the pulse width at lower frequencies, the system ensures that pixel circuits receive adequate charge even when the display operates at reduced power consumption modes, thus resolving the contradiction between power efficiency and display quality.
3Manufacturing precision
If different pulse widths are used for different stages, then display quality is maintained at lower frequencies, but device complexity increases
Solution Approach 1:
The scan driver applies different pulse widths to different stages based on their specific requirements. The first stage uses a first pulse width while the second stage uses a second pulse width, allowing each stage to be optimized for its function while maintaining overall display quality.
Solution Approach 2:
The scan driver is divided into multiple stages, each capable of operating with different pulse widths. This segmentation allows the system to manage complexity by handling each stage independently with appropriate pulse width settings rather than requiring a completely different approach for the entire driver.
Data Source
AI summary
A display device includes a display panel. The display panel includes a plurality of pixels receiving a first scan signal and a second scan signal, and a scan driver. The scan driver includes a first stage and a second stage arranged sequentially. A first pulse width of the second scan signal output from the first stage is different from a second pulse width of the second scan signal output from the second stage, when the second scan signal output from each of the first stage and the second stage is activated simultaneously.