Array Substrate Vertical Coupling Capacitors Aperture Ratio
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Solution Overview
Problem
Conventional capacitive in-cell touch screen panels have a low aperture ratio due to large areas occupied by coupling capacitors in non-display regions, which reduces the brightness of the display device.
Innovation Solution
The array substrate design features touch sensing lines and sensing electrodes in different layers, spaced apart by an insulating layer, forming vertically disposed coupling capacitors that reduce non-display areas and increase the aperture ratio, enhancing brightness by increasing the capacitance per unit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coupling capacitors are formed by extending parts of touch sensing lines and sensing electrodes parallel to each other in the same plane, then capacitance detection function is achieved, but large area is occupied in non-display regions reducing aperture ratio
Solution Approach 1:
The patent transitions the coupling capacitor configuration from a planar arrangement (extending parts parallel to each other in the same plane) to a vertical stacked arrangement (touch sensing line and sensing electrode in different layers). This dimensional change from 2D to 3D space allows the capacitors to occupy significantly less area in the non-display region while maintaining adequate capacitance value, thereby improving the aperture ratio without sacrificing touch detection sensitivity
2Ease of operation
If coupling capacitors are located in non-display areas to avoid interfering with display pixels, then touch sensing function is achieved, but display brightness is reduced due to lower aperture ratio
Solution Approach 1:
By stacking the touch sensing line and sensing electrode in different layers vertically, the patent reduces the horizontal footprint of coupling capacitors in non-display areas. This allows for more efficient space utilization, increasing the aperture ratio and consequently improving display brightness while preserving the touch sensing functionality
Solution Approach 2:
The patent integrates the coupling capacitor structure with the existing touch sensing line and sensing electrode components by utilizing the vertical space between different layers. This merging approach eliminates the need for separate planar capacitor structures, reducing overall area occupation and improving both aperture ratio and brightness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the aperture ratio and brightness of the touch screen panel by increasing the sensitivity of capacitance detection while reducing the area occupied by capacitors, allowing for more efficient touch location determination.
Implementation Method 1
spaced apart by an insulating layer and have an overlapping region
Implementation Method 2
the touch sensing line and the sensing electrode are provided in different layers, spaced apart by an insulating layer and have an overlapping region
Data Source
AI summary
An array substrate, a touch screen panel and a display device are provided. The array substrate includes a plurality of gate lines, a plurality of data lines, a plurality of touch sensing units, and each touch sensing unit comprises a touch scanning line, a touch sensing line, a first transistor and a sensing electrode, the touch scanning line is connected with a gate electrode and a drain electrode of the first transistor and the sensing electrode is connected with a source electrode of the first transistor; the touch sensing line and the sensing electrode are provided in different layers, spaced apart by an insulating layer and have an overlapping region. This array substrate decreases areas of non-display regions on the array substrate, increases aperture ratio of the touch screen panel and in turn enhances brightness of the display device.