In-Cell Touch Display Panel Through Hole Interconnect
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Solution Overview
Problem
Conventional in-cell touch displays with two layers of silicon nitride reduce light transmittance due to interference between touch and drive signals, resulting in lower brightness.
Innovation Solution
A display panel design with a thin film transistor substrate, a planarization layer, and through holes exposing source/drain electrodes, where specific layers are stacked to create non-display and display regions, eliminating the need for intermediate layers in the display region to enhance light transmittance and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two layers of silicon nitride are added to avoid signal interference, then touch control function is achieved, but light transmittance of the thin film transistor is reduced
Solution Approach 1:
The patent divides the touch panel into distinct display region and non-display region. The two silicon nitride layers are selectively positioned only in the non-display region, separating the signal interference protection function from the light transmission area. This segmentation allows the touch control function to be maintained through the silicon nitride layers while preventing them from blocking light in the display region.
Solution Approach 2:
The patent applies different structural qualities to different regions: the non-display region contains both silicon nitride layers for signal interference protection, while the display region contains only one silicon nitride layer to maintain light transmittance. This local differentiation of structural quality ensures that each region has the appropriate properties for its specific function.
2Adaptability or versatility
If conventional in-cell touch display structure is used, then touch functionality is achieved, but brightness is reduced due to signal interference between touch and drive signals
Solution Approach 1:
The patent segments the interference protection function to be performed only in the non-display region where the two silicon nitride layers are positioned. This allows the display region to maintain high brightness without the signal interference problem, as the segmentation isolates the interference mitigation function from the light transmission path.
Solution Approach 2:
The patent introduces a ground electrode layer as an intermediary element between the touch electrode and the drive signals. This ground electrode acts as a mediator to shield the drive signals from electromagnetic interference generated by the touch electrode, thereby maintaining both touch functionality and display brightness.
Data Source
AI summary
A display panel and a touch display device are provided. The display panel includes a thin film transistor substrate, a planarization layer, and a through hole. The through hole exposes a source/drain electrode of the thin film transistor substrate. A first intermediate layer, a metal wire layer, a second intermediate layer, a first common electrode layer, a first passivation layer, and a first pixel electrode layer are stacked on each other and arranged corresponding to the source/drain electrode at one side of the through hole. A second common electrode layer, a second passivation layer, and a second pixel electrode layer are stacked on each other at another side of the through hole. The first common electrode layer is electrically connected to the metal wire layer, and the first pixel electrode layer is electrically connected to the second pixel electrode layer through and along the through hole.