In-Cell Touch Display Panel with Conductive Spacer Signal Routing
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Solution Overview
Problem
The high reflectance of metal electrodes in the array substrate of liquid crystal display panels reduces light transmittance and brightness due to the in-cell touch structure, which is exacerbated by the need for an organic insulating layer to prevent crosstalk between touch and pixel electrodes, complicating high-temperature thin film transistor processes.
Innovation Solution
The display panel design positions the backlight module on one substrate away from the other, with touch electrodes and conductive primary spacers connecting to touch signal traces through a via hole in the common electrode layer and insulating layer, allowing for reduced metal layer reflection and improved light transmittance by arranging touch electrodes and spacers in a way that avoids direct contact with the common electrode, thus enhancing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes and pixel electrodes are disposed on opposite substrates with an organic insulating layer to prevent crosstalk, then electrical isolation is improved, but the high-temperature thin film transistor manufacturing process becomes more difficult
Solution Approach 1:
The patent introduces a specific organic insulating layer material that serves as an intermediary between the touch electrodes and pixel electrodes. This intermediary layer prevents crosstalk while being compatible with high-temperature manufacturing processes, thus resolving the contradiction between electrical isolation and ease of manufacture.
Solution Approach 2:
The patent modifies the parameters of the organic insulating layer, specifically its temperature resistance properties, to enable it to withstand high-temperature thin film transistor manufacturing processes. This parameter change allows the layer to maintain its insulating function while being compatible with the manufacturing process.
2Reliability
If a common electrode layer is disposed on the substrate close to the backlight module to prevent signal shielding, then touch signal transmission is improved, but light transmittance of the backlight module is reduced due to high reflectance of metal electrodes
Solution Approach 1:
The patent applies local quality by making the common electrode layer transparent or semi-transparent in the display area, allowing light to pass through while maintaining its function as a common electrode. This resolves the contradiction between touch signal transmission and brightness by having different optical properties in different locations.
Solution Approach 2:
The patent uses composite materials for the common electrode layer, combining conductive materials with transparent materials to create a layer that both conducts touch signals and allows light transmission. This composite structure resolves the contradiction between electrical function and optical transparency.
Data Source
AI summary
A display panel and a method of manufacturing thereof are provided. The display panel includes a backlight module, a first substrate and a second substrate opposite to each other, a plurality of touch signal traces disposed on the first substrate, a common electrode layer and a plurality of touch electrodes disposed on the second substrate, and a plurality of conductive primary spacers disposed between the first substrate and the second substrate. Two ends of the conductive primary spacers are connected to the touch electrodes and the touch signal traces, to avoid the shielding of the touch electrode signals by the common electrode.