Under-screen Camera Display Substrate with Shared Mask Touch Lines
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Solution Overview
Problem
Current display technologies for full-screen designs with under-screen cameras require multiple masks and planarization layers for ITO lines, increasing manufacturing costs and complexity, and often compromise touch functionality at the under-screen camera region.
Innovation Solution
A display substrate with a driving signal line extraction scheme using a second driving signal line with higher light transmittance at the under-screen camera region, made of the same material as the touch signal lines, allowing for a touch-in-cell function without additional masks, and simplifying the manufacturing process by sharing masks for leads and touch signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple masks and planarization layers are used for ITO lines at the under-screen camera region, then the light transmittance can be improved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The patent merges the mask patterns for the second driving signal line (ITO line) and the touch signal line into a single mask. By making the touch signal line and ITO line share the same mask pattern, the patent eliminates the need for separate masks and planarization layers, thereby reducing manufacturing complexity while maintaining high light transmittance at the under-screen camera region
Solution Approach 2:
The touch signal line serves dual functions: it acts as both a touch detection signal line and a driving signal line (ITO line) for the display. This multi-functionality allows the same structural element to fulfill multiple roles, eliminating redundant components and simplifying the manufacturing process
2Illumination intensity
If multiple masks and planarization layers are used for ITO lines, then the light transmittance can be improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the fabrication processes for the ITO line and touch signal line into a single step by using a shared mask. This merging of processes reduces the number of manufacturing steps, material consumption, and production time, thereby lowering manufacturing costs while achieving high light transmittance
3Illumination intensity
If the second driving signal line is made with higher light transmittance material, then the light transmittance at under-screen camera region is improved, but the touch functionality may be compromised
Solution Approach 1:
The touch signal line is designed to simultaneously serve as the driving signal line (ITO line) in the under-screen camera region. By making the same conductive layer perform both touch sensing and driving functions, the patent ensures that touch functionality is maintained while achieving high light transmittance, as the same material and structure fulfill both roles
4Manufacturing precision
If separate masks are used for leads and touch signal lines, then the manufacturing precision can be maintained, but the process complexity increases
Solution Approach 1:
The patent merges the mask patterns for leads and touch signal lines into a single integrated mask design. By making the touch signal line and ITO line share the same mask, the patent reduces the number of masking steps while maintaining manufacturing precision through unified pattern definition, thereby simplifying the overall process
Data Source
AI summary
A display substrate includes: a base substrate; a first driving signal line arranged at a camera-free region; a second driving signal line arranged at an under-screen camera region, a light transmittance of the first driving signal line being smaller than a light transmittance of the second driving signal line, and the second driving signal line including at least two layers of leads; and a touch structure arranged on the base substrate and arranged at at least one of the camera-free region and the under-screen camera region. The touch structure includes at least two layers of touch signal lines, one layer of touch signal lines is made of a same material and arranged at a same layer as one layer of leads, and the other layer of touch signal lines is made of a same material and arranged at a same layer as the other layer of leads.