Self-Capacitance Touch Electrode Segmentation for Large Display Panels

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Solution Overview

Problem

Large size display panels face limitations in touch control performance due to high coupling capacitance between electrodes and signal lines, which interferes with touch control signals and display signals, limiting touch control driving frequency.

Innovation Solution

A touch control display panel design featuring self-capacitance touch control electrodes with electrode blocks arranged in arrays, connected through touch control lead wires that are insulated from data lines, reducing coupling capacitance and allowing for improved touch control sensitivity without additional manufacturing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional touch control electrodes are used in large size display panels, then the display function is achieved, but the coupling capacitance between electrodes and signal lines increases, deteriorating touch control performance

Engineering Contradiction:

Improvetouch control performanceVSAvoidcoupling capacitance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The touch control electrode is divided into multiple electrode blocks arranged in an array, where only one electrode block is activated at a time during touch control scanning. This segmentation reduces the effective area of the touch electrode that interacts with data lines and gate lines, thereby reducing coupling capacitance while maintaining touch control functionality across the large display panel

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The touch control electrode dynamically switches between display mode and touch control mode through time-division multiplexing. During touch control period, the electrode receives scanning signals and functions as a self-capacitance touch electrode; during display period, it functions as a common electrode. This dynamic switching allows the same structure to serve dual purposes without permanently increasing coupling capacitance

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If touch control electrodes are integrated into the display panel, then touch control function is added, but the load on driving circuits increases due to high coupling capacitance

Engineering Contradiction:

Improvetouch control functionVSAvoiddriving circuit load

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

By segmenting the touch electrode into multiple small electrode blocks and activating only one at a time, the total capacitance load on the touch control scanning signal is reduced. This allows the driving circuit to charge and discharge smaller capacitance values during touch scanning, reducing energy consumption and driving circuit load

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The touch control electrode serves dual functions: as a common electrode during display period and as a self-capacitance touch electrode during touch control period. This multi-functionality allows the display panel to integrate touch control capability without adding separate dedicated touch electrode structures, reducing overall system complexity and energy requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If electrode blocks are arranged in arrays corresponding to pixel units, then touch control sensitivity is improved, but the coupling capacitance with gate lines and data lines increases

Engineering Contradiction:

Improvetouch control sensitivityVSAvoidcoupling capacitance with signal lines

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The electrode blocks are segmented and positioned to correspond to pixel units, with each block being small enough to limit its coupling capacitance with adjacent gate lines and data lines. The array arrangement allows selective activation of individual blocks, maintaining high touch control sensitivity while minimizing the capacitance interaction between active electrode blocks and signal lines

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel have different electrode block configurations optimized for their specific requirements. The electrode blocks are strategically positioned and sized to provide adequate touch sensitivity in each local region while minimizing coupling capacitance with nearby signal lines, allowing local optimization of the electrode structure

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10261624B2Touch control display panel, method of manufacturing the same, driving method, and display device

Publication Date: 2019.04.16 BOE TECHNOLOGY GROUP CO LTD

AI summary

A touch control display panel and a manufacturing method thereof, a driving method, and a display device are disclosed. The touch control display panel includes a plurality of pixel units configured on the array substrate in an array; the array substrate further includes a plurality of self capacitance touch control electrodes, which are arranged in an array, and each of which includes a plurality of electrode blocks, which have a one-to-one correspondence relationship with the plurality of pixel units; the array substrate further includes a plurality of touch control lead wires, which have a one-to-one correspondence relationship with the plurality of self capacitance touch control electrodes, the touch control lead wires are provided in gaps between adjacent columns of pixel units, which are corresponding to the plurality of self capacitance electrodes for touch control, and the plurality of self capacitance electrodes for touch control are connected with a touch control chip through the corresponding touch control lead wires.