Touch Electrode Switching Layout for Thin Full-Area Display Sensing
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Solution Overview
Problem
Existing display devices face challenges in ensuring reliable touch sensing across the entire sensor area without the need for additional sensor layers or digitizer layers, which can increase thickness and cost.
Innovation Solution
The display device incorporates a touch sensing unit with touch electrodes, a common voltage line, and switching elements, utilizing a touch driver to sense inputs during different periods and electromagnetic control signals to maintain stable potential at the touch electrodes, eliminating the need for separate sensor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sensor layers or digitizer layers are added to ensure reliable touch sensing, then sensing reliability is improved, but device thickness increases and manufacturing cost increases
Solution Approach 1:
The patent combines the touch sensing function with the display panel by integrating touch electrodes directly into the display structure. The touch electrodes are formed in the same metal layers used for the display circuitry, merging two functions (display and touch sensing) into a single integrated structure, thereby eliminating the need for separate sensor layers and reducing overall device thickness.
Solution Approach 2:
The metal layers in the display panel are designed to serve dual purposes: they function as both display circuitry and touch sensing electrodes. This multi-functional design allows the same structural elements to perform multiple roles, eliminating the need for additional dedicated sensor layers and reducing both thickness and manufacturing complexity.
2Reliability
If separate sensor layers or digitizer layers are added to ensure reliable touch sensing, then sensing reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the touch sensing function with the display panel by integrating touch electrodes directly into the display structure. The touch electrodes are formed in the same metal layers used for the display circuitry, merging two functions (display and touch sensing) into a single integrated structure, thereby eliminating the need for separate sensor layers and reducing overall device thickness.
Solution Approach 2:
The metal layers in the display panel are designed to serve dual purposes: they function as both display circuitry and touch sensing electrodes. This multi-functional design allows the same structural elements to perform multiple roles, eliminating the need for additional dedicated sensor layers and reducing both thickness and manufacturing complexity.
3Length of moving object
If touch electrodes are configured without additional sensor layers, then device thickness is reduced and manufacturing cost is lowered, but sensing reliability across the entire sensor area may be compromised
Solution Approach 1:
The patent divides the touch sensing area into multiple regions corresponding to different metal layers (first metal layer, second metal layer, third metal layer). Each metal layer segment is independently configured as touch electrodes, allowing the sensing function to be distributed across multiple segmented layers rather than requiring a single thick sensor layer. This segmentation maintains sensing reliability while reducing overall thickness.
Solution Approach 2:
Instead of relying on a single thick sensor layer in the vertical dimension, the patent distributes the touch sensing function across multiple metal layers in the vertical stack. This dimensional redistribution allows touch sensing to be achieved through the layered structure of the display panel itself, maintaining sensing coverage across the entire sensor area without adding extra thickness.
4Ease of manufacture
If touch electrodes are configured without additional sensor layers, then manufacturing cost is lowered, but sensing reliability across the entire sensor area may be compromised
Solution Approach 1:
The patent divides the touch sensing area into multiple regions corresponding to different metal layers (first metal layer, second metal layer, third metal layer). Each metal layer segment is independently configured as touch electrodes, allowing the sensing function to be distributed across multiple segmented layers rather than requiring a single thick sensor layer. This segmentation maintains sensing reliability while reducing overall thickness.
Solution Approach 2:
Instead of relying on a single thick sensor layer in the vertical dimension, the patent distributes the touch sensing function across multiple metal layers in the vertical stack. This dimensional redistribution allows touch sensing to be achieved through the layered structure of the display panel itself, maintaining sensing coverage across the entire sensor area without adding extra thickness.
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 configuration enhances sensing reliability and sensitivity across the entire touch sensor area, reduces device thickness, and lowers costs by eliminating the need for additional layers.
Implementation Method 1
a plurality of switching elements connected between the common voltage line and a second end of each of the plurality of touch electrodes
Data Source
AI summary
A display device including: a display unit having a plurality of pixels; a plurality of touch electrodes disposed on the display unit; a touch line connected to a first end of each of the plurality of touch electrodes; a common voltage line spaced apart from the plurality of touch electrodes; and a plurality of switching elements connected between the common voltage line and a second end of each of the plurality of touch electrodes.