Touch Display Device With Alternating Electrode Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch display devices with separate touch panels suffer from increased thickness, reduced light transmission efficiency, and higher manufacturing costs due to complex manufacturing processes and potential ghost phenomena during multi-touch operations.
Innovation Solution
A touch display device with a touch electrode group comprising alternating long and short electrodes, utilizing self-capacitance and mutual-capacitance sensing operations to reduce ghost phenomena by dividing electrodes into groups and using a multiplexer to perform these sensing operations sequentially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate touch panel is stacked on the display device, then touch sensing function is provided, but the device becomes thicker and manufacturing cost increases
Solution Approach 1:
The patent combines the touch electrode and display electrode into a single integrated electrode structure within the display panel. The touch electrode and display electrode are formed in the same layer using the same material and manufacturing process, eliminating the need for a separate touch panel stack and reducing overall device thickness while maintaining touch sensing functionality.
Solution Approach 2:
The electrode structure serves dual functions: it acts as both the display electrode for image rendering and the touch electrode for touch sensing. By making the electrode multi-functional, the patent eliminates the need for separate touch and display electrode layers, thereby reducing device thickness and simplifying manufacturing.
2Reliability
If a separate touch panel is stacked on the display device, then touch sensing function is provided, but manufacturing cost increases due to complex manufacturing process
Solution Approach 1:
The patent merges the touch electrode formation process with the display electrode formation process. Both electrodes are formed simultaneously in the same layer using the same photolithography and etching steps, eliminating the need for separate manufacturing processes and reducing overall manufacturing complexity and cost.
Solution Approach 2:
The electrode structure is designed to serve both display and touch functions, allowing a single manufacturing process to produce both functional elements. This multi-functional approach eliminates the need for separate manufacturing lines and processes for touch and display components.
3Reliability
If traditional touch electrode structure is used, then touch sensing is achieved, but ghost phenomenon occurs during multi-touch operations
Solution Approach 1:
The patent segments the electrode structure into distinct touch electrode and display electrode regions with clear spatial separation. The touch electrode is positioned at a different location and orientation relative to the display electrode, allowing independent sensing of touch events and eliminating ghost phenomena during multi-touch operations.
Solution Approach 2:
The patent applies different local characteristics to different parts of the electrode structure. The touch electrode has specific geometric features (such as being perpendicular to the display electrode) that are optimized for touch sensing, while the display electrode is optimized for image display. This local differentiation enables accurate touch detection without interference.
4Area of stationary object
If the size of touch panel increases, then display area increases, but number of touch electrodes and routing lines increases leading to increased complexity and cost
Solution Approach 1:
The patent combines the touch electrode routing with the display electrode routing, allowing both functions to share the same conductive pathways. This merging of routing reduces the total number of separate routing lines needed, thereby reducing manufacturing complexity and cost as display area increases.
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
The solution effectively reduces ghost phenomena and simplifies manufacturing by using a woven type touch electrode structure with alternating long and short electrodes, improving touch accuracy and reducing manufacturing complexity and costs.
Implementation Method 1
a touch circuit sequentially performing a self-capacitance sensing operation and a mutual-capacitance sensing operation for the touch electrode group
Implementation Method 2
a touch circuit sequentially performing a self-capacitance sensing operation and a mutual-capacitance sensing operation for the touch electrode group
Data Source
AI summary
Embodiments of the present disclosure relate to a touch display device, a touch circuit and a touch driving method thereof, and more particularly, a touch display device, a touch circuit and a touch driving method thereof enable to reduce effectively a ghost phenomenon in touch electrode groups by dividing a plurality of touch electrodes into a plurality of touch electrode groups with same patterns. The touch display device may include a display panel including a touch electrode group in which a plurality of long touch electrodes with long length and a plurality of short touch electrodes with short length in a first direction are alternately arranged in a second direction; and a touch circuit sequentially performing a self-capacitance sensing operation and a mutual-capacitance sensing operation for the touch electrode group.