In-Cell Touch Display Bezel Reduction via Common Electrode Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing flat display devices face challenges in reducing the width of the bezel area while maintaining functionality, as separate touch panels and driving circuits occupy space, limiting the slimness of devices and reducing the effective display area.
Innovation Solution
An in-cell touch display device is designed with touch electrodes on the cover glass extending into the display area to overlap with common electrodes, allowing touch sensing without additional touch panels or driving circuits in the bezel area, thereby reducing bezel width and enhancing device slimness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate touch panel is attached to the display panel or separate touch electrodes are disposed within the display panel, then touch functionality is achieved, but the width of the bezel area cannot be sufficiently decreased
Solution Approach 1:
The patent combines the display panel and touch panel into a single integrated structure. The common electrode of the display panel serves dual purposes: as a display electrode and as a touch sensing electrode. This merging eliminates the need for separate touch panels and reduces the bezel width while maintaining both display and touch functionalities.
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously. It acts as both a display electrode for image rendering and a touch electrode for sensing user input. This multi-functionality allows the system to achieve touch capability without adding separate components that would increase bezel width.
2Ease of operation
If part of the display area is designated as button keys, then touch type button keys are achieved, but the width of the effective display area is reduced
Solution Approach 1:
The patent segments the touch sensing function from the display area by utilizing the common electrode that extends into the bezel region. This allows touch-type button keys to be implemented in the bezel area without occupying any portion of the effective display area, thus maintaining full display functionality while providing touch input capabilities.
3Ease of operation
If additional touch panels and driving circuits are added to the bezel area, then touch functionality is achieved, but the device becomes less slim
Solution Approach 1:
The patent merges the touch driving circuit with the display driving circuit by using the same common electrode for both display and touch functions. This integration eliminates the need for separate touch driving circuits in the bezel area, reducing overall device volume and maintaining slimness while providing touch functionality.
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 solution enables a slim display device with reduced bezel width by integrating touch sensing into the display panel, eliminating the need for additional touch panels and circuits, while maintaining effective touch functionality.
Implementation Method 1
at least one touch electrode located on a cover glass, corresponding to one or more touch key areas separated at intervals in a bezel area, extended to a display area and overlapping with a common electrode neighboring the touch key area from among the plurality of common electrodes
Data Source
AI summary
A touch display device capable of reducing the width of a bezel area and achieving a slim device while arranging touch type button keys in the bezel area. The touch display device may be an in-cell touch display device that include at least one touch electrode located on a cover glass, corresponding to one or more touch key areas separated at intervals in a bezel area, extended to a display area and overlapping with a common electrode neighboring the touch key area from among the plurality of common electrodes. Accordingly, when a touch key area is touched, the voltage of a common electrode overlapping the touch electrode changes to sense whether the touch key area is touched, and thus there may not be a need to provide an additional touch panel and an additional touch driving circuit to the bezel area.