Touch Display Panel Raised Area Signal Isolation
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Solution Overview
Problem
In-cell touch display panels face challenges in maintaining uniform thickness and isolating touch signals from display signals, which can interfere with the touch and display effects.
Innovation Solution
A touch display panel structure with a raised area at the periphery of the active area, where the touch sensor is electrically insulated from the active area but in electrical contact with the raised area, allowing for the transmission of touch signals through a stacked structure that prevents interference from display signals, ensuring uniform thickness and effective touch and display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the touch sensor is placed inside the active area, then the panel thickness can be reduced, but the touch signal may be interfered by display signals
Solution Approach 1:
The panel is divided into distinct functional zones: an active area for display and a raised area for touch sensor placement. This spatial segmentation allows the touch sensor to be positioned at the periphery rather than within the active display area, preventing interference between display signals and touch signals while maintaining a thin panel structure.
Solution Approach 2:
A raised area with stacked structure serves as an intermediary between the substrate and the touch sensor. This raised area provides electrical connection for the touch sensor while being electrically insulated from the active area, acting as a mediator that enables touch functionality without allowing signal interference from the display region.
2Device complexity
If the touch sensor is electrically connected to the active area, then signal transmission is simplified, but touch signal interference from display signals occurs
Solution Approach 1:
The raised area functions as an intermediary electrical pathway. It provides a dedicated electrical connection route for the touch sensor that is physically and electrically separated from the active area. The stacked structure in the raised area conducts touch signals while the insulating layers prevent leakage or interference with display signals in the active area.
Solution Approach 2:
Different regions of the panel are assigned different electrical properties: the active area contains display signal lines, while the raised area contains touch sensor connection lines with different electrical characteristics. This local differentiation of electrical properties allows independent signal transmission paths that prevent mutual interference.
3Length of stationary object
If the panel uses in-cell technology, then the frame can be narrowed, but manufacturing precision requirements increase
Solution Approach 1:
The design transitions from a planar structure to a three-dimensional structure by introducing a raised area with stacked layers. This vertical dimension allows the touch sensor to be positioned at a different elevation than the display components, enabling precise thickness control in the active area while accommodating the touch sensor infrastructure at the periphery.
Solution Approach 2:
The patent controls the thickness parameter by ensuring the active area and raised area have matching thicknesses in the vertical direction. This parameter matching ensures uniform overall panel thickness while allowing the raised area to accommodate the touch sensor stacking structure, thus maintaining manufacturing precision.
Data Source
AI summary
The present disclosure relates to a touch display panel and a method for manufacturing the same. The display panel includes: an active area disposed on a substrate and including a light emitting device; a raised area disposed on the substrate, located at a periphery of the active area and including a stacked structure; and a touch sensor disposed on a side of the active area and the raised area away from the substrate, wherein the touch sensor is electrically insulated from the active area and is in electrical contact with the raised area; wherein a thickness of the active area matches a thickness of the raised area to ensure a uniform thickness of the touch display panel, and the raised area is electrically insulated from the active area, and a touch signal sensed by the touch sensor is transmitted via the raised area.