In-Cell Touch Display Panel Aperture Ratio Optimization
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Solution Overview
Problem
Existing in-cell touch display panels face challenges in achieving a high aperture ratio while maintaining effective touch sensing capabilities, leading to reduced user experience and increased complexity in manufacturing processes.
Innovation Solution
The implementation of a thin film transistor substrate with a specific layer structure, including a combination of non-transparent metal layers and transparent conductive layers, arranged to form touch sensor areas that detect touch operations without compromising the aperture ratio, and utilizing a black matrix to cover metal wires, thereby optimizing the display panel's design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal layers are used for touch sensing in in-cell touch display panels, then touch sensing capability is achieved, but the aperture ratio is reduced due to the non-transparent nature of metal layers
Solution Approach 1:
The patent combines transparent conductive layers (such as ITO) with metal layers to form a composite touch sensing electrode structure. This merging allows the structure to maintain both the electrical conductivity needed for touch sensing and the optical transparency required for high aperture ratio, resolving the contradiction between touch sensing capability and aperture ratio.
Solution Approach 2:
The patent employs composite material structures where transparent conductive oxide layers are integrated with metal layers. This composite approach enables the touch sensing electrode to simultaneously achieve electrical functionality for touch detection and optical transparency, thereby maintaining high aperture ratio while ensuring reliable touch sensing capability.
2Measurement precision
If multiple metal layers are added to improve touch sensing, then touch detection accuracy is enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent designs metal layers to serve multiple functions: they provide touch sensing capability, act as electrode structures for liquid crystal control, and contribute to the overall electrical circuitry. This multi-functionality reduces the need for separate dedicated layers, thereby enhancing touch detection accuracy while limiting the increase in device complexity.
3Adaptability or versatility
If metal layers are used for touch sensing, then in-cell touch functionality is achieved, but manufacturing process complexity increases due to additional masking steps
Solution Approach 1:
The patent merges the touch sensing electrode formation with existing electrode formation processes in the liquid crystal display manufacturing sequence. By combining these functions into integrated layer structures, the patent achieves in-cell touch functionality while minimizing the need for separate, complex masking steps, thereby improving ease of manufacture.
Data Source
AI summary
The present disclosure provides a thin film transistor (TFT) substrate. The TFT substrate includes a first metal layer, a second metal layer, a first transparent layer, a third metal layer, and a second transparent layer. The first metal layer includes at least one gate electrode. The second metal layer is insulated to the first metal layer and includes at least one source electrode and at least one drain electrode. The first transparent layer is insulated to the first metal layer and the second metal layer. The first transparent layer includes at least one common electrode layer. The third metal layer includes a plurality of metal wires electrically connected to the common electrode layer. The second transparent layer includes a plurality of transparent conductive wires electrically connected to the drain electrode. The metal wires and the transparent conductive wires form a touch sensing structure configured to detect touch operations.