Touch Display Gate Driver Interlaced Scan Timing

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Solution Overview

Problem

High-resolution touch display devices face reduced gate line driving time and touch sensing time due to increased number of gate lines, leading to image quality degradation and inaccurate touch detection.

Innovation Solution

Implementing an interlaced scan mode where all gate lines are driven sequentially during a unit field period, with the remaining time used for touch sensing, allowing for sufficient gate driving and touch sensing times while reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If all gate lines are driven in one field period to support high resolution, then the resolution is improved, but the gate line driving time and touch sensing time are reduced

Engineering Contradiction:
Improvedisplay resolutionVSAvoidgate line driving time
Core Design Contradiction:
Manufacturing precisionVSDuration of action of moving object

Solution Approach 1:

The patent divides the gate line driving process into multiple field periods instead of completing all gate line driving in one field period. Specifically, it segments the driving of different gate lines across different field periods, allowing each gate line to be driven with sufficient time while still achieving high resolution display. This segmentation resolves the contradiction by distributing the driving task over time rather than compressing it into a single field period.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent employs periodic action by repeating the gate line driving process across multiple field periods. Instead of a single continuous driving sequence, the system periodically drives different groups of gate lines in different field periods, ensuring that each gate line receives adequate driving time while maintaining the overall high resolution display performance.

Inventive Principle:
Principle #19Periodic action

2Manufacturing precision

If all gate lines are driven in one field period, then the display resolution is improved, but the touch sensing accuracy is reduced

Engineering Contradiction:
Improvedisplay resolutionVSAvoidtouch sensing accuracy
Core Design Contradiction:
Manufacturing precisionVSMeasurement precision

Solution Approach 1:

The patent segments the field period into distinct time intervals: a gate line driving period and a touch sensing period. By dividing the time resources, the system can allocate sufficient time for both high-resolution display driving and accurate touch sensing without one compromising the other. This temporal segmentation resolves the contradiction between resolution and touch sensing accuracy.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent implements periodic alternation between gate line driving operations and touch sensing operations across multiple field periods. This periodic action ensures that touch sensing is performed with adequate time and resources in dedicated sensing periods, while gate lines are driven in dedicated driving periods, thereby maintaining both high resolution and accurate touch detection.

Inventive Principle:
Principle #19Periodic action

3Duration of action of moving object

If gate lines are driven sequentially in multiple field periods, then the gate driving time is sufficient, but the power consumption increases

Engineering Contradiction:
Improvegate driving timeVSAvoidpower consumption
Core Design Contradiction:
Duration of action of moving objectVSUse of energy by moving object

Solution Approach 1:

The patent uses periodic action to drive gate lines across multiple field periods, activating only the necessary gate lines during each period rather than continuously driving all gate lines. This periodic activation reduces overall power consumption compared to continuous driving, while still providing sufficient gate driving time for high-resolution displays by repeating the process across multiple periods.

Inventive Principle:
Principle #19Periodic action

Solution Approach 2:

The patent segments the gate line driving task across multiple field periods, distributing the power consumption over time rather than concentrating it in a single period. This segmentation allows the system to use lower power levels during each individual field period while achieving the same cumulative driving effect, thereby reducing peak power consumption and overall energy usage.

Inventive Principle:
Principle #1Segmentation

4Manufacturing precision

If the number of gate lines is increased for high resolution, then the display quality is improved, but the touch sensing time is reduced

Engineering Contradiction:
Improvedisplay resolutionVSAvoidtouch sensing time
Core Design Contradiction:
Manufacturing precisionVSDuration of action of moving object

Solution Approach 1:

The patent segments the field period into distinct gate line driving periods and touch sensing periods. By this segmentation, the system can dedicate specific time intervals for touch sensing regardless of the number of gate lines being driven. This ensures that even with increased gate line count for high resolution, sufficient time is allocated for accurate touch sensing without compromise.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent implements periodic touch sensing operations across multiple field periods, ensuring that touch sensing is performed regularly with adequate time intervals. This periodic action maintains consistent touch sensing time even as the number of gate lines increases, because the sensing operations are scheduled independently of the gate line driving schedule in dedicated sensing periods.

Inventive Principle:
Principle #19Periodic action

Data Source

PatentUS10303275B2Touch display device and method for driving the same
Publication Date: 2019.05.28 LG DISPLAY CO LTD
  • US10303275B2 patent drawing
  • US10303275B2 patent drawing
  • US10303275B2 patent drawing

AI summary

A touch display device includes a touch display panel for displaying an image corresponding to a touch applied from outside the touch display device, a gate driver for sequentially driving all gate lines of the touch display panel once during a unit field period including at least two continuous field periods, in such a manner that a total gate driving period corresponding to a sum of individual gate driving periods of all gate lines is shorter than the unit field period, and a touch control unit for defining periods of the unit field period other than the total gate driving period, as a touch sensing period, and performing an operation for sensing a touch on the touch display panel during the touch sensing period.