Array Substrate Bridging Structure for In-Cell Touch Insulation
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Solution Overview
Problem
In LCD displays with in-cell touch technology, the proximity of touch sensing electrode lines to pixel electrodes increases the risk of short circuits and reduces yield due to insufficient electrical insulation.
Innovation Solution
The introduction of a bridging structure with a first inactive display region between the touch sensing electrodes and signal lines, which increases the distance between the bridging structure and pixel electrodes, ensuring good electrical insulation and reducing the probability of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the touch sensing electrode lines are placed close to the pixel electrodes to achieve in-cell touch functionality, then the display becomes lighter and thinner, but the electrical insulation between the bridging structure and pixel electrode deteriorates, increasing the risk of short circuits
Solution Approach 1:
The patent introduces a bridging structure with vertical components (first part and third part extending perpendicular to the substrate) to connect the touch sensing electrode line with the signal line. This three-dimensional arrangement increases the spatial separation between the bridging structure and the pixel electrode in the vertical dimension, thereby improving electrical insulation while maintaining the in-cell touch configuration.
Solution Approach 2:
The bridging structure acts as an intermediary element between the touch sensing electrode line and the signal line. It provides an indirect connection path that maintains electrical insulation from the pixel electrode, preventing direct contact and reducing short circuit risk while still enabling signal transmission.
2Device complexity
If the touch sensing electrode lines are placed close to the pixel electrodes, then the display structure is simplified, but the manufacturing yield deteriorates due to increased short circuit probability
Solution Approach 1:
By utilizing the vertical dimension with bridging structure components extending perpendicular to the substrate, the patent achieves adequate electrical insulation without requiring larger lateral spacing. This maintains structural simplicity while improving manufacturing yield by reducing short circuit defects.
3Reliability
If the distance between the bridging structure and pixel electrode is increased to improve electrical insulation, then the risk of short circuits is reduced, but the display area is decreased
Solution Approach 1:
The patent resolves the area loss issue by implementing the insulation solution in the vertical dimension rather than the lateral dimension. The bridging structure's vertical components provide the necessary electrical insulation without consuming additional display area, as the separation is achieved through height rather than width.
Data Source
AI summary
An array substrate and a display panel are disclosed. The display panel includes: a color filter substrate; an array substrate; and a liquid crystal layer disposed between the color filter substrate and the array substrate. The color filter substrate is divided into opaque regions and light-transmissive regions by a black matrix. The array substrate includes pixel regions defined by gate lines and data lines, pixel electrodes, first signal lines, and common electrodes. The common electrodes and the first signal lines are electrically connected through bridge structures. Each bridge structure includes a first part, a second part, and a third part. The first part is connected to one of the first signal lines, the third part is connected to one of the common electrodes, and a projection of the second part falls within a projection of one of the data lines or one of the gate lines.