Touch Display Device Electrode Grouping for Power Sensitivity Trade-off

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Solution Overview

Problem

Touch display devices face a trade-off between power consumption and sensitivity in touch sensing, as driving all touch electrodes improves sensitivity but increases power consumption, while alternately driving them reduces sensitivity but conserves power.

Innovation Solution

The solution involves grouping touch electrodes into touch sensing blocks and non-touch blocks and adjusting sensing ratios and frequencies based on active and idle modes, allowing for continuous sensing in touch blocks and reduced sensing in non-touch blocks, thereby managing power consumption without compromising sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If all touch electrodes are driven continuously, then touch sensing sensitivity is improved, but power consumption increases

Engineering Contradiction:

Improvetouch sensing sensitivityVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent divides the touch electrode array into multiple groups (first group and second group) that are driven alternately at different frequencies. This segmentation allows the system to maintain touch sensing capability while reducing the number of electrodes driven simultaneously, thereby lowering power consumption while preserving sensitivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic frequency adjustment where the first group of touch electrodes is driven at a first frequency and the second group at a second frequency, with the ability to switch between driving modes. This dynamic approach optimizes the balance between sensitivity and power consumption based on operational requirements.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If touch electrodes are driven alternately, then power consumption is reduced, but touch sensing sensitivity deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidtouch sensing sensitivity

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent employs periodic alternating driving of touch electrode groups at different frequencies. By systematically switching between driving the first group at a higher frequency and the second group at a lower frequency, the system maintains adequate sensitivity while achieving power savings through reduced simultaneous activation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the driving frequency parameter for different groups of touch electrodes, with the first group driven at a first frequency and the second group at a second frequency. This parameter differentiation allows optimization of both sensitivity and power consumption by matching driving characteristics to group-specific requirements.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11163398B2Touch display device and touch driving method thereof

Publication Date: 2021.11.02 LG DISPLAY CO LTD

AI summary

Provided are a touch display device and a touch driving method thereof. Touch electrodes are grouped into a touch sensing block and non-touch blocks. The touch electrodes in the touch sensing block and the touch electrodes in the non-touch blocks are sensed at different sensing ratios. Power consumption is efficiently managed and sensitivity in touch sensing is maintained.