Touch Display Driving Signal Line Structure
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Solution Overview
Problem
High-resolution and large-size touch display devices experience luminance variations due to increased RC delay in signal lines, leading to deterioration in image quality.
Innovation Solution
A touch display device is designed with a multi-layered driving signal line structure, where a first driving signal line is disposed below the encapsulation unit and a second driving signal line is disposed above it, connected through power contact holes, reducing line resistance and RC delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display device is made higher in resolution and larger in size, then the display quality and coverage are improved, but the RC delay of driving signals increases causing luminance variation
Solution Approach 1:
The patent introduces a dual-layer signal line structure where signal lines are arranged in both upper and lower layers relative to the encapsulation unit. This three-dimensional arrangement reduces the effective path length and resistance without compromising the two-dimensional display resolution, thereby maintaining luminance uniformity while achieving high resolution and large size.
Solution Approach 2:
The signal transmission path is segmented into multiple sections by distributing signal lines across different layers (upper and lower layers). This segmentation allows each signal line to be shorter and have lower resistance, preventing the cumulative RC delay effect that would otherwise cause luminance variation in large, high-resolution displays.
2Device complexity
If single-layer signal line structure is used, then device structure is simple, but line resistance and RC delay are high causing luminance variation
Solution Approach 1:
The patent transitions from a two-dimensional single-layer signal line arrangement to a three-dimensional dual-layer configuration. By adding the vertical dimension (upper and lower layers), the signal transmission path is optimized to reduce resistance and RC delay without significantly increasing overall device complexity.
3Reliability
If multi-layer driving signal line structure is used, then line resistance and RC delay are reduced improving luminance uniformity, but device structure becomes more complex
Solution Approach 1:
The signal transmission function is segmented between upper and lower layer signal lines, with each layer handling specific signal routes. This segmentation achieves reduced RC delay and improved luminance uniformity while maintaining manageable structural complexity through functional division.
Data Source
AI summary
A touch display device for preventing deterioration in image quality is structured such that a plurality of touch sensors is disposed on an encapsulation unit encapsulating a light-emitting element and includes a driving signal line, which includes a first driving signal line disposed below the encapsulation unit and a second driving signal line disposed above the encapsulation unit so as to be in contact with the first driving signal line to reduce line resistance of the driving signal line, thereby preventing deterioration in image quality.