In-Cell Touch Electrode Layout for Narrow-Bezel Display Keys
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Solution Overview
Problem
Existing touch-sensitive display devices face challenges in reducing the width of the bezel area while maintaining functionality, as separate touch panels and driving circuits occupy valuable 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 detection 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 decreased and device slimness is limited
Solution Approach 1:
The patent merges the touch electrode function with the common electrode of the display panel by extending the touch electrode into the display area to overlap with the common electrode. This integration eliminates the need for separate touch panels or additional touch electrodes in the bezel area, thereby reducing bezel width while maintaining touch functionality.
Solution Approach 2:
The common electrode serves dual functions: it acts as both the common electrode for the liquid crystal display and as the touch electrode for sensing touch inputs. This multi-functionality allows the system to achieve touch capability without requiring additional dedicated touch components in the bezel area.
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 area for actually displaying images is reduced
Solution Approach 1:
The patent segments the touch sensing function from the display area by placing touch electrodes in the bezel area that extend into the display area. This allows the display area to remain fully dedicated to image display while touch sensing occurs in the overlapping region, preventing any reduction in effective display area.
Solution Approach 2:
The patent moves the touch sensing function to a different spatial dimension by having touch electrodes extend vertically from the bezel area into the display area, overlapping with the common electrode. This dimensional approach allows touch functionality to coexist with full display area without conflict.
3Ease of operation
If additional touch panels and driving circuits are provided in the bezel area, then touch key functionality is achieved, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent combines the touch driving circuit with the existing 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, thereby reducing device complexity and simplifying manufacturing.
Solution Approach 2:
The common electrode and its associated driving circuit serve dual purposes for both display operation and touch sensing. This multi-functionality reduces the overall number of components and circuits required, simplifying the device structure and manufacturing process.
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 the reduction of bezel area width, allowing for a slimmer display device with integrated touch functionality, eliminating the need for additional touch panels and circuits, and maintaining the usefulness of the bezel area for other features.
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.