Array Substrate Scan Segmentation for Low-Power Static LCD Images
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Solution Overview
Problem
Current LCD displays face high power consumption due to unnecessary power loss in storage and liquid crystal capacitors when displaying static images, resulting from the switching of positive and negative polarities.
Innovation Solution
An array substrate with a scan driver circuit that outputs different scan signals to two groups of TFT switches, where one group is turned off during static image display, reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion is adopted to control voltage at both ends of liquid crystal, then afterimages are avoided, but power consumption increases due to unnecessary switching of positive and negative polarities during static image display
Solution Approach 1:
The patent segments the TFT switches in each row into two groups (first group and second group), allowing independent control of their scan signals. This segmentation enables selective turning off of one group during static image display, reducing power consumption while maintaining the refreshing function through the other group to prevent afterimages
Solution Approach 2:
The patent implements periodic action by alternating the refreshing function between the first and second groups of TFT switches. During static image display, one group is turned off while the other continues to refresh, and they switch roles periodically, thereby reducing overall power consumption while maintaining afterimage prevention
2Reliability
If all TFT switches are continuously refreshed to prevent afterimages, then display quality is maintained, but power consumption increases due to continuous switching activity
Solution Approach 1:
The patent divides TFT switches into two independently controllable groups, enabling selective operation where only one group needs to be active during static image display, thereby maintaining display quality through continued refreshing while reducing overall power consumption
Solution Approach 2:
The patent applies local quality by allowing different operational states for different groups of TFT switches - one group is in active refreshing state while the other is in off state during static image display, optimizing power consumption locally without compromising overall display quality
Data Source
AI summary
An array substrate includes a plurality of TFT switches arranged in an array and a scan driver circuit. In each row of TFT switches, a plurality of TFT switches form a first group of switches, and the rest of the TFT switches form a second group of switches. The scan driver circuit outputs first and second scan signals for each row of the TFT switches. The first group of switches receives the first scan signal, and the second group of switches receives the second scan signal. When a static image is displayed, the first scan signal or the second scan signal is an off signal to turn off the first or second group of switches.