Touch Display Panel Notch Design RC Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The notch design in touch display panels leads to variations in touch electrode areas, resulting in inconsistent RC loading and voltage distribution, which affects touch sensitivity and display quality, causing color differences in images.
Innovation Solution
The touch display panel is designed with a common electrode layer and layout layer, where touch electrodes of different areas have adjusted resistances and wire configurations to ensure identical first resistances, and an insulation layer with varying numbers of vias to balance contact resistances, achieving consistent RC loading across all electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a notch design is implemented to increase screen ratio, then the screen ratio is improved, but the touch electrode areas vary causing inconsistent RC loading and color differences
Solution Approach 1:
The patent applies local quality by making different parts of the common electrode layer have different structures. Specifically, touch electrodes in different regions (first, second, and third sub-electrode layers) have different areas and are divided into different groups. Each group's electrodes are designed with specific area characteristics to compensate for the notch design's impact, ensuring uniform RC loading across all electrodes despite varying physical areas.
2Shape
If touch electrodes surrounding the notch have smaller areas, then the notch design is achieved, but the RC loading varies among electrodes affecting touch sensitivity
Solution Approach 1:
The patent changes the parameter of electrode area distribution by dividing touch electrodes into different groups based on their positions relative to the notch. Electrodes in the first sub-electrode layer have different areas, electrodes in the second sub-electrode layer have yet another area distribution, and electrodes in the third sub-electrode layer have a third area distribution. This parameter variation compensates for the notch's impact, maintaining uniform RC loading and touch sensitivity across the display.
3Device complexity
If a same common voltage is supplied to all touch electrodes, then the voltage supply is simplified, but the different RC loadings cause voltage differences at electrode terminals
Solution Approach 1:
The patent applies local quality by creating different electrode area configurations in different regions of the common electrode layer. The first sub-electrode layer, second sub-electrode layer, and third sub-electrode layer each have touch electrodes with different area characteristics. This local variation in electrode structure compensates for the position-dependent RC loading effects, ensuring that all electrodes receive effectively uniform voltage despite their different positions relative to the notch.
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 effectively eliminates touch and display differences caused by varying electrode areas, ensuring uniform touch sensitivity and image quality by maintaining consistent RC loading and voltage distribution.
Implementation Method 1
the touch electrodes 701's capacitance is determined by its area, greater area means greater capacitance
Implementation Method 2
the principle behind a LCD panel is to alter the alignment of the liquid crystal molecules in the liquid crystal layer by the electrical field formed between the substrates
Implementation Method 3
light from the backlight module is refracted to produce pictures
Data Source
AI summary
The present invention teaches a touch display panel having a notch. A first resistance of a touch electrode is defined as the sum of a contact resistance between the touch electrode and the touch electrode's corresponding wire, and a resistance of the corresponding wire. For touch electrodes of an identical area, the touch electrodes have an identical first resistances. For touch electrodes of different areas, the touch electrodes of smaller areas have greater first resistances than those of the touch electrodes of greater areas. A consistent RC loading is obtained for touch electrodes of different areas, thereby effectively eliminating the touch and display differences resulted from the different areas of touch electrodes as the touch display panel has a notch design.