Selective Scan Driver Memory Control for Partial-Refresh Displays
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Solution Overview
Problem
Conventional display devices face limitations in reducing power consumption when displaying partial images or videos, as they require driving the entire display region at a high frame rate, even when only a small portion is active, leading to unnecessary power consumption.
Innovation Solution
A scan driver that provides multiple scan signals to pixel rows at different driving frequencies, allowing selective scan driving through a memory unit that selectively outputs start signals and data voltages to scan units, enabling programming and selective scan modes to adjust frame rates based on image content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the entire display region is driven at a high frame rate to display video content, then the video display quality is improved, but the power consumption increases
Solution Approach 1:
The display region is divided into multiple scan regions (first scan region and second scan region) that can be driven at different frame rates. The scan driver selectively applies high frame rate to regions displaying video content and low frame rate to regions displaying still images, thereby reducing overall power consumption while maintaining video quality where needed.
Solution Approach 2:
Different parts of the display region are assigned different driving characteristics based on their content requirements. The first scan region receives high frame rate driving for video content, while the second scan region receives low frame rate driving for still images, optimizing power consumption according to local content needs.
2Use of energy by moving object
If the entire display region is driven at a low frame rate to reduce power consumption, then the power consumption is reduced, but the video display quality deteriorates
Solution Approach 1:
The scan driver separates the display region into multiple scan regions with different frame rates. By driving only the necessary region (first scan region) at high frame rate and other regions (second scan region) at low frame rate, the system maintains video quality where needed while reducing overall power consumption.
Solution Approach 2:
Instead of applying high frame rate driving to the entire display region, the system applies it only partially to the specific region where video content is displayed. This partial action approach reduces unnecessary power consumption while maintaining video display quality in the required area.
3Adaptability or versatility
If sequential scanning from first stage to last stage is performed to display partial images, then the image display flexibility is improved, but the frame rate adjustment capability is limited
Solution Approach 1:
The scan driver is divided into multiple independent scan regions (first scan region and second scan region) that can be controlled separately. This segmentation enables different frame rates to be applied to different regions, providing both display flexibility and frame rate adjustment capability without requiring complex sequential scanning of the entire display region.
Solution Approach 2:
The scan driver dynamically adjusts the frame rate for different scan regions based on the displayed content. The first scan region can be driven at high frame rate for video content while the second scan region operates at low frame rate for still images, providing adaptive frame rate control that enhances both flexibility and content appropriateness.
Data Source
AI summary
A scan driver of a display device includes a plurality of stages. Each stage includes: a scan unit which includes a plurality of scan transistors and outputs a scan signal for driving a scan line using the plurality of scan transistors; and a memory unit which receives a start signal, a data voltage, and a scan control signal, and selectively outputs, to the scan unit, at least one among the start signal and the data voltage as a scan start signal. The start signal may include an initial start signal and a scan signal of a previous stage. In a programming mode, the memory unit outputs the start signal to the scan unit as the scan start signal, and in a selective scan driving mode, does not output the start signal and outputs the data voltage to the scan unit as the scan start signal.