Flexible Display Gate-In-Panel Scan Driver Segmentation
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Solution Overview
Problem
Conventional scan drivers in display devices are unable to efficiently control the refresh rate and power consumption of selective regions of the screen, making it difficult to display various types of image content and reduce power usage effectively.
Innovation Solution
The display device is divided into multiple driving areas with a scan driver that includes level shifters and shift registers with stage groups, allowing for independent control of scan signal output and refresh rates across different regions, using external start signal lines to manage noise and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a typical scan driver outputs scan signals sequentially from the first stage to the last stage, then the display can be driven uniformly, but it becomes difficult to control selective regions of the screen differently from other regions
Solution Approach 1:
The shift register is divided into multiple stage groups, where each stage group corresponds to a specific driving area of the display panel. Each stage group includes multiple stages that can be independently controlled through separate start signal lines, enabling selective region control while maintaining a systematic structure that avoids excessive complexity
Solution Approach 2:
Separate start signal lines are introduced as intermediaries to control each stage group independently. These start signal lines act as mediators between the control logic and the shift register stages, allowing selective activation of different driving areas without requiring complete redesign of the scan driver architecture
2Use of energy by moving object
If the refresh rate of pixels in a selective region is adjusted differently from other regions, then power consumption can be reduced, but the scan driver structure becomes more complex
Solution Approach 1:
The display area is divided into multiple driving areas, each corresponding to a stage group in the shift register. This segmentation allows different refresh rates to be applied to different regions by controlling the timing of start signals for each stage group, enabling power reduction in regions with static or less dynamic content
Solution Approach 2:
Different refresh rates are implemented by applying start signals to different stage groups at different periodic intervals. Regions with static content can use lower refresh rates (longer periods between start signals), while regions with dynamic content maintain higher refresh rates, thereby reducing overall power consumption
3Ease of manufacture
If IC chips are mounted in the non-display area as scan drivers, then the scan driver function is achieved, but the bezel size cannot be reduced
Solution Approach 1:
The scan driver circuitry is merged with the display panel by implementing the shift register stages directly on the panel substrate using thin-film transistors. This integration eliminates the need for separate IC chip mounting in the non-display area, thereby reducing the bezel size while maintaining the scan driver functionality
Solution Approach 2:
The display panel substrate serves multiple functions: it acts as both the display surface and the mounting platform for the scan driver circuitry. The thin-film transistor layers are used both for pixel switching and for shift register operation, eliminating the need for dedicated IC chips and reducing overall device footprint
Data Source
AI summary
Provided are a display panel including a scan driver and a method of operating the same. The display panel includes a shift register including a plurality of stages that shifts and outputs a clock signal. A display area in the display panel is divided into a plurality of driving areas. The stages of the shift register corresponding to each driving area form a stage group. In each stage group, the stages included in the stage group sequentially output a scan signal by using an independent start signal.