Active Matrix Substrate Touch Wiring Vertical Stacking
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Solution Overview
Problem
In lateral-field mode liquid crystal display panels with touch sensing, the integration of touch wiring and pixel electrodes leads to a decrease in pixel aperture ratio, affecting light transmittance and display performance.
Innovation Solution
A method for manufacturing active matrix substrates that involves forming specific apertures and contact holes to optimize the placement of touch wiring lines and electrodes, ensuring minimal overlap with gate bus lines and electrodes, thereby maintaining high pixel aperture ratio while enabling touch sensing functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch wiring lines and electrode contact portions are formed in the displaying region, then touch sensing functionality is enabled, but pixel aperture ratio decreases
Solution Approach 1:
The patent utilizes the vertical dimension by forming touch wiring lines and electrode contact portions in the vertical direction overlapping with the common electrode, rather than extending them horizontally across the pixel region. This dimensional reorientation allows touch sensing components to occupy vertical space above the common electrode without encroaching on the horizontal pixel aperture area, thereby resolving the contradiction between enabling touch sensing and maintaining high aperture ratio.
2Reliability
If touch wiring contact portions are formed in the displaying region, then touch wiring connectivity is achieved, but light transmittance is reduced
Solution Approach 1:
The patent positions touch wiring lines and their contact portions in the vertical direction above the common electrode, utilizing the z-dimension for wiring routing. This eliminates the need for horizontal wiring traces across the pixel aperture that would block light, thereby maintaining high light transmittance while ensuring reliable touch wiring connectivity through properly positioned contact holes and wiring structures.
3Ease of manufacture
If electrode contact portions overlap with gate bus lines, then manufacturing process is simplified, but pixel aperture ratio decreases
Solution Approach 1:
The patent forms electrode contact portions in the vertical direction that overlap with the common electrode region, rather than allowing horizontal overlap with gate bus lines. This vertical stacking approach maintains manufacturing simplicity by utilizing existing layer structures while preventing aperture ratio degradation, as the contact portions are positioned above the common electrode rather than extending into the pixel aperture region where gate bus lines are located.
Data Source
AI summary
A method for manufacturing an active matrix substrate including a thin film transistor for each pixel, and a first electrode and a first wiring line for touchscreen panel function includes: forming a transparent electrically conductive film on an interlayer insulating layer and within a first contact hole; forming, on a portion of the transparent electrically conductive film, an upper wiring portion to become an upper layer of the first wiring line; patterning the transparent electrically conductive film to make a pixel electrode and form a lower wiring portion to become a lower layer of the first wiring line; forming a dielectric layer covering the pixel electrode and the first wiring line and having a second contact hole through which a portion of the first wiring line is exposed; and forming a common electrode which is electrically connected to the first wiring line within the second contact hole.