Touch Panel Detection Circuit Using Source Lines for Touch Sensing

Solution Overview

Problem

Existing touch panel manufacturing processes are complicated and costly due to the need for additional touch sensors, which increase production complexity and yield reduction.

Innovation Solution

A touch detection circuit comprising a gate driving circuit, a source driving circuit, and a detection circuit that detects signal levels on source lines of a display panel to identify touch locations without requiring extra touch electrodes or sensors, simplifying the control and fabrication processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If additional touch sensors are fabricated using on-cell, in-cell, or hybrid in-cell processes, then touch detection capability is achieved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvetouch detection capabilityVSAvoidfabrication process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The existing source lines and gate lines of the display panel are made to serve dual purposes: driving the display and detecting touch events. The source lines function as both data transmission conduits for display pixels and sensing electrodes for touch detection, eliminating the need for separate touch sensor fabrication

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The touch detection function is merged with the existing display driving circuitry. The detection circuit reuses the source driving circuit and gate driving circuit infrastructure, combining touch sensing capabilities with the display control system to reduce overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If additional touch sensors are fabricated, then touch detection capability is achieved, but manufacturing cost increases

Engineering Contradiction:

Improvetouch detection capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The existing source lines and gate lines of the display panel are made to serve dual purposes: driving the display and detecting touch events. The source lines function as both data transmission conduits for display pixels and sensing electrodes for touch detection, eliminating the need for separate touch sensor fabrication

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The display panel's existing infrastructure (source lines, gate lines, driving circuits) serves the touch detection function without requiring external or additional components. The system uses its own built-in structures for dual purposes, eliminating the need for separate touch sensor manufacturing processes

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If touch sensors are added to the display panel, then touch detection capability is achieved, but production yield decreases

Engineering Contradiction:

Improvetouch detection capabilityVSAvoidproduction yield

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The touch detection function is merged with the existing display driving circuitry. The detection circuit reuses the source driving circuit and gate driving circuit infrastructure, combining touch sensing capabilities with the display control system to reduce overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch detection capability is extracted and implemented through software/control logic that processes signals from the existing display infrastructure, rather than extracting physical touch sensor components. This allows touch functionality to be added without physical manufacturing steps

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11847280B2Touch panel and touch detection circuit thereof

Publication Date: 2023.12.19 XMYTH IP GRP LTD

AI summary

The present invention provides a touch panel and the touch detection circuit thereof, which comprise a gate driving circuit, a source driving circuit, and a detection circuit. The gate driving circuit is coupled to a plurality of gate lines of a display panel, outputs a plurality of gate signals to the plurality of gate lines, and controls state transition of the plurality of gate signals. The source driving circuit is coupled to a plurality of source lines of the display panel. The detection circuit is coupled to the plurality of source lines or to a portion of the plurality of source lines. The detection circuit detects the levels of the plurality of signals on the coupled source lines when the gate signals change states and generates a plurality of detection signals.