Scan Driver Clock Masking for Selective Display Driving
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption while driving only specific areas of the display panel without complicating the circuit configuration of the scan driver.
Innovation Solution
A display device with a timing controller that generates a clock signal and start signal, and a scan driver with multiple stages that output the clock signal as a scan signal, including a masking unit to partially mask the clock signals, allowing selective driving of scan lines and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the scan driver is modified to select only some scan lines, then power consumption is reduced, but the circuit configuration becomes complicated
Solution Approach 1:
The patent extracts the masking function from the scan driver circuit itself and implements it in the timing controller. By removing the masking functionality from the scan driver and placing it in the timing controller, the scan driver's circuit configuration remains simple while still achieving selective scan line driving and power consumption reduction.
Solution Approach 2:
The timing controller acts as an intermediary between the signal source and the scan driver. It introduces masked clock signals as an intermediate control mechanism, allowing selective activation of scan lines without modifying the scan driver's internal circuit structure. This mediator approach enables power saving while maintaining circuit simplicity.
2Adaptability or versatility
If masking is applied to the clock signal, then selective driving of scan lines is achieved, but the timing control becomes more complex
Solution Approach 1:
The patent segments the clock signal into multiple phases (first clock signal and second clock signal shifted by half-cycle) and applies masking to specific phases. This segmentation allows selective driving of scan lines during specific time periods while maintaining regular timing control for other periods, achieving adaptability without excessive timing complexity.
Solution Approach 2:
The masking is applied periodically to the clock signal in a periodic manner, allowing the scan driver to operate in different modes (full operation vs. selective driving) at different time intervals. This periodic approach enables selective driving capability while keeping the timing control mechanism relatively simple through regular, predictable masking patterns.
Data Source
AI summary
A display device includes a timing controller, a scan driver, a data driver, and a display unit. The timing controller generates a clock signal, a start signal, and image data. The scan driver includes a plurality of stages for sequentially outputting the clock signal as a scan signal in response to the start signal. The data driver generates a data signal using the image data. The display unit includes pixels for emitting light with a luminance corresponding to the data signal in response to the scan signal. The timing controller performs masking on the clock signal in a part of a first frame period during which the scan driver sequentially outputs the scan signal.