Display Device Screen Electrode at Rounded Corners
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Solution Overview
Problem
Display devices with curved corners face challenges in maintaining touch sensitivity and preventing pixels from being viewed from the outside, especially when arranged in a stair step shape, which affects the recognition area of touch inputs.
Innovation Solution
The implementation of screen electrodes at rounded corners and linear edges, electrically connected to touch electrodes, and touch lines extending onto pixels at stair step shapes, enhances touch sensitivity and expands the touch recognition area by masking pixels from external view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixels are arranged in a stair step shape at rounded corners to maximize display area, then the display area is increased, but pixels become visible from the outside and touch sensitivity is reduced
Solution Approach 1:
The display device segments the corner region into display pixels and a separate screen electrode region. The screen electrode is positioned at the rounded corner to mask the stair-step pixels, dividing the corner area into functional zones that address both display coverage and visual masking requirements
Solution Approach 2:
A screen electrode is introduced as an intermediary element between the pixels and the external environment. This electrode serves as a mediator that blocks the view of stair-step pixels from the outside while maintaining touch sensitivity by being electrically connected to touch electrodes
2Object-affected harmful factors
If screen electrodes are added at rounded corners to mask pixels, then pixel visibility is reduced, but touch sensitivity is reduced and touch recognition area is decreased
Solution Approach 1:
The screen electrode is merged with the touch electrode system through electrical connection. The screen electrode at the rounded corner is electrically connected to adjacent touch electrodes, allowing it to function both as a visual mask and as part of the touch sensing network, thereby maintaining touch sensitivity while masking pixels
Solution Approach 2:
The screen electrode serves multiple functions simultaneously: it masks pixels from external view, maintains touch sensitivity through electrical connection to touch electrodes, and expands the touch recognition area by being included in the touch electrode network
3Object-affected harmful factors
If touch lines are extended onto pixels at stair step shapes to screen pixels, then pixel visibility is reduced, but the non-display region area is decreased
Solution Approach 1:
The touch lines are extended into the display region along the rounded corner in a new spatial arrangement. This dimensional extension allows the screening function to be achieved within the display area rather than requiring additional non-display region space
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 improves touch sensitivity and increases the area capable of recognizing touch inputs while minimizing the visibility of pixels at curved corners, thereby enhancing the overall performance of display devices.
Implementation Method 1
a screen electrode disposed along a rounded corner to overlap with pixels disposed adjacent to the rounded corner among the plurality of pixels
Implementation Method 2
A capacitance between the plurality of touch electrodes may be changed by a contact on the surface of the display device, and a touch may be sensed by the change in capacitance
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A display device includes: a display panel including a display region including a rounded corner, the display region having a plurality of pixels arranged therein, and a non-display region surrounding the display region; a plurality of touch electrodes overlapping with the display region; and a first screen electrode disposed along the rounded corner to overlap with pixels disposed adjacent to the rounded corner among the plurality of pixels, the first screen electrode being electrically connected to some of the plurality of touch electrodes. Accordingly, the touch sensitivity of the touch electrodes can be improved, and pixels arranged in a stair step shape at the round corner of the display region can be prevented or reduced from being viewed from the outside.