In-cell Touch LCD Array Substrate Narrow Border Design
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Solution Overview
Problem
Conventional mutual-capacitive in-cell touch panels face challenges in achieving a narrow border design due to the occupied space by wiring areas, which hinders the slim and artistic outlook of touch display panels.
Innovation Solution
The array substrate structure of the in-cell touch liquid crystal panel is enhanced by rearranging the touch driving and sensing electrodes, with a hollowed area formed by removing unconnected touch driving electrode projections and strategically placing metal wiring layers to minimize border width, allowing for a narrow border design without occupying the panel's border area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection wirings are configured to route from the left and right side of the display area and extend along the Y-direction to connect to the touch control chip, then the touch panel achieves functional connectivity, but the wiring areas occupy space at the left and right sides of the display area, increasing the border width
Solution Approach 1:
The patent transitions the wiring layout from a planar two-dimensional arrangement (routing along the edges in the X-direction) to a three-dimensional stacked arrangement. The touch driving electrodes are positioned at a first level above the array substrate, while connection wirings are positioned at a second level below the array substrate. This vertical separation in the Z-dimension eliminates the need for wiring areas to occupy the border regions at the same level as the display area, thereby reducing border width while maintaining connectivity.
Solution Approach 2:
The array substrate itself serves as an intermediary structure that mediates between the touch driving electrodes and the connection wirings. By positioning the touch driving electrodes above the array substrate and the connection wirings below it, the array substrate acts as a spatial mediator that enables electrical connectivity without requiring the wirings to occupy the same planar space as the display area, thus resolving the contradiction between connectivity and border width.
2Adaptability or versatility
If the touch driving electrode and touch sensing electrode are configured directly on the array substrate in a double-layer ITO structure, then the touch panel achieves mutual-capacitive functionality, but the connection wirings require border area space, hindering narrow-border design
Solution Approach 1:
The patent maintains the mutual-capacitive functionality by preserving the touch driving electrodes and touch sensing electrodes configuration, but resolves the border area occupancy issue by moving the connection wirings to a different spatial dimension. The connection wirings are positioned at a second level below the array substrate, while the touch electrodes remain at the first level above it. This vertical separation allows the full utilization of the display area for touch functionality without sacrificing border space to connection wirings.
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 configuration effectively reduces the border width of the liquid crystal panel, enabling a narrow border design while maintaining the functionality of the touch panel, thus enhancing the aesthetic appeal and competitiveness of touch display devices.
Implementation Method 1
the pixel electrode electrically connects with the TFT via a first through hole
Implementation Method 2
the suspended electrodes are insulated from the touch driving electrode
Implementation Method 3
each of the driving electrode wirings electrically connects to one of the touch driving electrodes via the second through hole
Implementation Method 4
each of the suspended electrode wirings electrically connects to the suspended electrodes arranged along the second direction via the third through hole
Data Source
AI summary
An in-cell touch liquid crystal panel and the array substrate are disclosed. The array substrate includes a glass substrate and a TFT, a common electrode layer, and a pixel electrode formed on the glass substrate. The common electrode layer includes a plurality of bar-shaped touch driving electrodes insulated from each other. Each of the touch driving electrodes includes a plurality of suspended electrodes. A second insulation layer and a metal wiring layer are arranged between the common electrode layer and the passivation layer in sequence. The metal wiring layer includes a plurality of driving electrode wirings, a plurality of suspended electrode wirings, and a plurality of touch sensing electrodes. Each of the driving electrode wirings electrically connects to one of the touch driving electrodes via the through holes on the insulation layer, and each of the suspended electrode wirings electrically connects to the suspended electrodes arranged along the second direction.