OLED Display Panel Touch Bonding Terminal Segmentation
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Solution Overview
Problem
The existing Oncell OLED display devices suffer from mutual interference between touch and display signals due to parasitic capacitance between the touch signal line and the display signal line, affecting both display and touch performance.
Innovation Solution
The OLED display panel and device design separate the touch and display bonding terminal areas, ensuring the touch signal line is connected to its corresponding terminal outside the display signal line's terminal area, thereby avoiding cross-overs and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch signal line and display signal line are connected to signal terminals through both sides of the display panel, then the touch control function and display function can be realized, but parasitic capacitance is generated between the touch signal line and display signal line causing signal interference
Solution Approach 1:
The bonding terminal area is divided into a first bonding terminal area for touch signal lines and a second bonding terminal area for display signal lines. This spatial segmentation prevents parasitic capacitance between touch and display signal lines while maintaining both touch control and display functions independently.
Solution Approach 2:
The patent transitions from a conventional single-plane signal routing to a multi-dimensional arrangement where touch and display signal lines are separated in the planar bonding terminal area. This dimensional reorganization eliminates parasitic capacitance interference while preserving signal transmission functionality.
2Length of stationary object
If the touch layer is arranged on the encapsulation layer to reduce display panel thickness, then the display panel thickness is reduced, but the touch signal line and display signal line cross over causing parasitic capacitance
Solution Approach 1:
The bonding terminal area is segmented into distinct first and second bonding terminal areas, spatially separating touch and display signal connections. This segmentation prevents signal line crossover and parasitic capacitance generation while maintaining the thin-profile Oncell structure.
Solution Approach 2:
The separated bonding terminal areas act as intermediary zones that facilitate independent connection of touch and display signal lines to their respective terminals. This intermediary arrangement prevents direct interaction between touch and display signals, eliminating parasitic capacitance.
3Ease of operation
If metal lines are extended to signal terminals on both sides to connect touch electrodes, then touch control function is achieved, but interference between touch signal and display signal occurs due to parasitic capacitance
Solution Approach 1:
The bonding terminal area is divided into separate first and second bonding terminal areas for touch and display signals respectively. This segmentation ensures that touch control functionality is maintained while eliminating parasitic capacitance-induced interference, thereby improving signal reliability.
Solution Approach 2:
Different regions of the bonding terminal area are assigned different functions: the first bonding terminal area is optimized for touch signal connections while the second bonding terminal area is optimized for display signal connections. This local differentiation prevents signal interference while maintaining operational ease.
Data Source
AI summary
An organic light emitting diode (OLED) display device, comprising: an OLED display panel, comprising a substrate, a driving circuit layer and a touch layer; wherein the OLED display panel further comprises a touch bonding terminal area and a display bonding terminal area, and the touch bonding terminal area is provided with a touch bonding terminal and the display bonding terminal area is provided with a display bonding terminal; a touch driving chip, comprising a touch connection terminal and a display connection terminal; and a flexible circuit board; wherein the flexible circuit board comprises a converting terminal and a converting line, and the touch bonding terminal is bonded to the converting terminal, and one end of the converting line is connected to the converting terminal and an other end of the converting line is connected to the touch connection terminal.