Gate Driving Circuit for Parallel Multi-Scan Touch Sensing
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Solution Overview
Problem
Current display devices face inefficiencies in touch sensing operations due to the sequential nature of scan signal output, which prolongs the time required for detecting touches across multiple locations on the display panel.
Innovation Solution
A gate driving circuit that selectively drives multiple stages to output multi-scan signals simultaneously, allowing for concurrent touch sensing across multiple locations on the display panel, thereby reducing the time needed for touch sensing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sequential scanning method is used for touch sensing, then the device complexity is reduced, but the time required for touch sensing increases
Solution Approach 1:
The gate driving circuit is divided into multiple independent stages (first stage, second stage, etc.), each capable of independently outputting scan signals. Each stage includes separate driving circuits and node controllers that can operate concurrently, enabling parallel touch sensing across multiple display regions simultaneously, thus reducing total sensing time.
Solution Approach 2:
The circuit employs dynamic voltage control through node controllers that adjust voltages at nodes (Q, Qb, M) based on operational requirements. The node controllers dynamically switch between different voltage states to enable stages to be selectively activated or deactivated, allowing flexible parallel operation of multiple stages during touch sensing operations.
2Productivity
If multiple stages are driven simultaneously for multi-location touch sensing, then the productivity is improved, but the use of energy increases
Solution Approach 1:
The node controllers dynamically adjust the operational state of each stage based on real-time requirements. During touch sensing, only the necessary stages are activated to specific voltage states, while other stages remain in low-power states. This dynamic control allows the circuit to scale energy consumption according to the actual number of locations being sensed, improving efficiency.
Solution Approach 2:
The circuit changes voltage parameters at key nodes (Q, Qb, M) to control the operational state of different stages. By adjusting voltage levels, the system can selectively enable or disable stages, allowing parallel operation of multiple stages when needed for fast sensing, while reducing to single-stage operation during normal display periods to minimize energy consumption.
Data Source
AI summary
A gate driving circuit including a driving circuit configured to charge an M node based on a selection signal externally supplied in response to receiving a first carry signal, and charge a Q node with a high voltage responsive to a reset signal and a voltage charged in the M node that corresponds to the selection signal, a node controller configured to control the Q node and a Qb node responsive to driving of the driving circuit, wherein a level of a voltage of the Qb node is opposite to a level of a voltage of the Q node, and an output circuit configured to output a second carry signal and at least one scan signal responsive to voltages at the Q node and Qb node included in the node controller.