Touch Sensing Display Block Segmentation for Lower Power Sensing
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Solution Overview
Problem
Touch sensing display devices consume excessive power due to continuous touch sensing on all touch nodes regardless of the region where the input occurs.
Innovation Solution
Implementing a touch sensing display device with active and inactive touch blocks, where active blocks are fully sensed and inactive blocks are half-sensed based on the touch driving signal's pulse periods, reducing power consumption by alternating the sensing circuits' activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch sensing is performed on all touch nodes continuously, then touch recognition accuracy is maintained, but power consumption increases excessively
Solution Approach 1:
The display panel is divided into multiple touch blocks, and each touch block is further divided into active touch blocks (where touch inputs occur) and inactive touch blocks (where no touch inputs occur). The sensing circuit selectively senses touch nodes in active touch blocks during entire pulse periods and touch nodes in inactive touch blocks during half pulse periods, thereby reducing overall power consumption while maintaining recognition accuracy in active regions.
Solution Approach 2:
Different sensing strategies are applied to different regions of the display panel. Active touch blocks receive full sensing attention during complete pulse periods to ensure accurate touch recognition, while inactive touch blocks receive reduced sensing attention during half pulse periods to save power. This local differentiation optimizes the balance between accuracy and power consumption.
2Measurement precision
If full sensing is applied to all touch blocks, then touch resolution is maintained, but power consumption increases
Solution Approach 1:
The sensing circuit dynamically adjusts its operation mode based on the current pulse period and touch block type. During odd pulse periods, the circuit performs full sensing on active touch blocks and half sensing on inactive touch blocks. During even pulse periods, it performs half sensing on active touch blocks and full sensing on inactive touch blocks. This dynamic adjustment maintains touch resolution where needed while reducing power consumption overall.
Solution Approach 2:
The sensing operation is performed periodically in alternating pulse periods. In odd pulse periods, the sensing circuit follows a specific sensing pattern, and in even pulse periods, it follows a different pattern. This periodic alternation between full and half sensing modes enables power consumption reduction while maintaining adequate touch resolution through time-divisional sensing strategies.
Data Source
AI summary
A touch sensing display device includes a display panel including a plurality of touch blocks which are divided into at least one active touch block and at least one inactive touch block with respect to a touch input position and each touch block provided with a plurality of touch nodes and a plurality of sensing circuits configured to full-sense touch nodes of the active touch block for a first time and half-sense touch nodes of the inactive touch block for a second time, based on a touch driving signal, wherein the first time corresponds to entire pulse periods of the touch driving signal, and the second time corresponds to odd pulse periods or even pulse periods of the touch driving signal.