In Cell Touch Panel Resistance Compensation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In-cell touch panels face challenges in achieving high resolution while maintaining low manufacturing costs, as increasing the number of sensing lines and processors is costly and limited by layout constraints.

Innovation Solution

The implementation of a sensing signal processor with a plurality of pins connecting to readout lines, which branch into sub-readout lines with series resistors of different resistances, allowing for increased sensing lines without increasing the number of pins, thereby enhancing resolution through resistance compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the number of sensing lines is increased to improve resolution, then the resolution is improved, but the number of processing pins must be increased resulting in high cost

Engineering Contradiction:

ImproveresolutionVSAvoidnumber of processing pins

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The readout lines are divided into multiple sub-readout lines, with each sub-readout line connecting to a different subset of sensing lines. This segmentation allows multiple sensing lines to share common readout paths, reducing the total number of processing pins required while maintaining high resolution capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different resistance values are assigned to different sub-readout lines to create unique electrical characteristics for each sensing line group. This parameter differentiation enables the system to distinguish between multiple sensing lines even when they share common readout paths, allowing resolution improvement without proportionally increasing processing pin count

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the number of sensing lines is increased to improve resolution, then the resolution is improved, but the layout area is limited

Engineering Contradiction:

ImproveresolutionVSAvoidlayout area

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each readout line serves multiple functions by branching into multiple sub-readout lines that connect to different sensing lines. This multi-functionality allows a limited number of readout lines to support a larger number of sensing lines, improving resolution without proportionally increasing layout area

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach doubles the resolution of the touch panel without increasing the number of pins in the processing chip, achieving improved touch position detection with enhanced voltage reading capabilities.

Implementation Method 1

series resistors connected to different sub-readout lines connected to the same readout line have different resistances with each other

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Data Source

PatentUS8665234B2In cell touch panel

Publication Date: 2014.03.04 HANNSTAR DISPLAY CORP

AI summary

Embodiments of the present invention employ resistance compensation to broaden voltage reading range of readout lines connected to a processing chip of an in cell touch panel. The resolution of the in cell touch panel is increased under the condition that the number of pins of the processing chip is not increased or is unchanged.