Touch Display Device With Varying Electrode Densities
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Solution Overview
Problem
Existing touch display devices have limitations in design flexibility and efficiency, particularly in the use of a touch panel with sensing electrodes, which can restrict the display's ability to have a reduced bezel area and a flexible outer peripheral design.
Innovation Solution
The touch display device incorporates a flexible outer peripheral area with a connection line acting as a part of the touch electrode, allowing for a curved edge design and maximizing the display surface by distributing touch sensing electrodes with varying densities across different areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel uses a fixed rectangular shape with uniform pixel density, then the manufacturing process is simple, but the bezel area cannot be minimized and design flexibility is limited
Solution Approach 1:
The patent applies local quality by dividing the display panel into a first area (central region) and a second area (outer peripheral region), where each area has different pixel densities. The first area has a first pixel density while the second area has a second pixel density, allowing the central display region to maintain high resolution while the peripheral region can be shaped flexibly to minimize bezel area.
2Adaptability or versatility
If the touch panel uses uniform sensing electrode density across the entire display area, then the touch sensing performance is consistent, but the outer peripheral area cannot be designed with curved edges and flexibility
Solution Approach 1:
The patent applies local quality to the touch sensor by configuring first sensing electrodes in the first area and second sensing electrodes in the second area with different densities. The first sensing electrodes are arranged with a first density and the second sensing electrodes with a second density, allowing the central touch region to maintain high sensing accuracy while the peripheral region accommodates curved edges and flexible designs.
Solution Approach 2:
The patent segments the touch sensing electrodes into two distinct groups: first sensing electrodes for the central area and second sensing electrodes for the outer peripheral area. This segmentation allows each region to be optimized independently for its specific functional requirements.
3Area of stationary object
If the display panel maximizes the display surface area, then the bezel area is minimized, but the outer peripheral area requires curved edge design that complicates the structure
Solution Approach 1:
The patent applies local quality by allowing the second area (outer peripheral region) to have a curved shape while the first area (central region) maintains a rectangular shape. This enables the display panel to maximize the overall display surface area with curved edges that follow the contour of the device, while the central display region maintains its traditional rectangular geometry for simplicity.
Data Source
AI summary
A touch display device comprises: a display panel including a substrate having a first area in a center of the substrate and a second area that surrounds the first area, a plurality of first pixels in the first area of the substrate, and a plurality of second pixels in the second area of the substrate; and a touch sensor on the display panel, the touch sensor configured to sense touch and includes a plurality of first sensing electrodes in the first area and a plurality of second sensing electrodes in the second area. The plurality of first pixels and the plurality of second pixels have different densities, and the plurality of first sensing electrodes and the plurality of second sensing electrodes have different densities.