Touch Display Device with Integrated Non-Display Area Electrode
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Solution Overview
Problem
Conventional touch display devices have an irreducible thickness and decreased display contrast ratio due to an externally-attached touch substrate, which affects their quality and usability.
Innovation Solution
The touch electrode layer is integrated into the non-display area or outside the driving substrate, allowing for capacitive touch sensing without increasing the device thickness or compromising the display contrast ratio, using a combination of a touch electrode layer, insulating layer, and transparent conductive layer connected in specific voltage configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an externally-attached touch substrate is used, then capacitive touch sensing functionality is achieved, but the device thickness increases and display contrast ratio decreases
Solution Approach 1:
The patent merges the touch sensing function with the existing display structure by integrating a touch electrode layer into the non-display area of the driving substrate and utilizing the transparent conductive layer of the display module, eliminating the need for a separate externally-attached touch substrate while maintaining capacitive touch sensing functionality
Solution Approach 2:
The patent relocates the touch electrode from a separate external substrate to the driving substrate plane, using the non-display area dimension to house the touch electrode layer, thereby achieving touch functionality without adding thickness in the vertical dimension
2Adaptability or versatility
If an externally-attached touch substrate is used, then capacitive touch sensing functionality is achieved, but the display contrast ratio decreases
Solution Approach 1:
The patent combines the touch sensing function with the display module's existing transparent conductive layer, eliminating the need for an additional external touch substrate that would interfere with light transmission and display contrast ratio
Solution Approach 2:
The patent extracts the touch sensing function from the external touch substrate and integrates it into the display module's internal structure, removing the harmful external layer while preserving the beneficial touch functionality
3Length of stationary object
If the touch electrode layer is integrated into the driving substrate, then device thickness is reduced, but touch sensing performance may be affected
Solution Approach 1:
The patent segments the touch sensing function into two parts: the touch electrode layer in the non-display area of the driving substrate and the transparent conductive layer in the display area, with the insulating layer separating them, allowing both to work together without interference while maintaining thin profile
Solution Approach 2:
The insulating layer serves as an intermediary between the touch electrode layer and the transparent conductive layer, enabling capacitive coupling for touch sensing while preventing direct electrical contact, thus maintaining touch performance in a thin integrated structure
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 design enables a thinner touch display device with improved display contrast ratio and capacitive touch sensing functionality while maintaining low power consumption across different operational states.
Implementation Method 1
a first induced capacitance and a second induced capacitance connected in series are formed between the conductor and the touch electrode layer and between the conductor and the transparent conductive layer, respectively
Implementation Method 2
When the touch display device is in a touch state and a conductor performs a touch control on the touch display device, a first induced capacitance and a second induced capacitance connected in series are formed
Data Source
AI summary
A touch display device including a driving substrate, a display module, a touch electrode layer and an insulating layer is provided. The driving substrate has a display area and a non-display area located outside the display area. The display module includes a display medium layer, a transparent conductive layer and a transparent cover plate sequentially arranged on the driving substrate and located in the display area. The touch electrode layer is disposed in the non-display area of the driving substrate or outside the driving substrate. The insulating layer covers an upper surface of the display module and extendedly covers a top surface of the touch electrode layer along a side edge of the display module.