Touch Sensor Routing Wire Configuration for Display Devices
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Solution Overview
Problem
The existing touch sensor integrated type display devices face issues with parasitic capacitance causing ripples in common voltage, leading to reduced image quality and light leakage due to uneven liquid crystal distribution and step coverage between data lines and touch routing wires.
Innovation Solution
The configuration includes a plurality of gate lines and data lines crossing each other, with pixel electrodes and touch electrodes formed in an active area, and routing wires arranged on both sides of the data lines, connected to the touch electrodes, which reduces parasitic capacitance and minimizes step coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If routing wires are formed on the first passivation layer covering data lines, then touch electrode connection is achieved, but step coverage is generated causing liquid crystal distribution unevenness and light leakage
Solution Approach 1:
The patent transitions from forming routing wires on the first passivation layer (2D surface) to forming them on the second passivation layer (different layer dimension). This dimensional change eliminates the step coverage issue because the routing wires are now formed at a different elevation level, allowing uniform liquid crystal distribution without light leakage.
2Adaptability or versatility
If touch routing wires are formed in the active area, then touch sensor functionality is achieved, but parasitic capacitance increases causing common voltage ripples and image quality reduction
Solution Approach 1:
The patent extracts the touch routing wires from the active area where they caused parasitic capacitance issues. By moving the routing wires to the bezel area and forming them on the second passivation layer, the harmful parasitic capacitance is eliminated while maintaining touch sensor functionality through the touch electrodes formed in the active area.
3Area of stationary object
If data lines and touch routing wires are formed at the same location, then space utilization is improved, but step coverage is generated causing light leakage
Solution Approach 1:
The patent resolves the light leakage issue by forming touch routing wires on the second passivation layer instead of the first passivation layer. This vertical dimension separation allows data lines and routing wires to occupy the same horizontal space without creating step coverage, thereby eliminating light leakage while maintaining space utilization efficiency.
Data Source
AI summary
A touch sensor integrated type display device includes a plurality of gate lines and a plurality of data lines which are arranged to cross over each other, a plurality of pixel electrodes respectively disposed in areas defined by the crossing of the plurality of gate lines and the plurality of data lines, a plurality of touch electrodes serving as common electrodes, each of which overlaps some of the plurality of pixel electrodes in an active area, and a routing wire which is arranged on at least one side of each of first and second data lines related to the some pixel electrodes corresponding to each touch electrode serving as the common electrode in parallel with the first and second data lines. The routing wire is connected to the touch electrode serving as the common electrode.