Array Substrate Touch Units Direct Overlap Signal Load
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Solution Overview
Problem
The pixel structure of Advanced Super Dimensional Switching (ADS) type liquid crystal display panels faces challenges with high load and signal attenuation, particularly in large-size and super-large display devices using In-cell touch technology, which restricts the development of these devices.
Innovation Solution
An array substrate with touch units connected to touch lines by direct overlap, reducing the load on the pixel structure, and incorporating a thin film transistor, passivation protection layer, and insulating protection layer to enhance touch signal detection and display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch units are connected to touch lines through traditional routing methods, then signal transmission is achieved, but pixel structure load increases and signal attenuation occurs
Solution Approach 1:
The patent transitions from planar routing connections to vertical stacking connections by placing touch units and touch lines in different layers (third layer and fourth layer respectively) with direct overlap. This dimensional change eliminates long horizontal signal paths and reduces pixel structure load while maintaining signal transmission quality.
2Strength
If traditional laminated structure is used for touch screens, then structural integrity is maintained, but screen thickness increases
Solution Approach 1:
The patent embeds touch signal lines within the TFT array structure by integrating them into the same substrate layers. The touch units are formed in the third layer and touch lines in the fourth layer, creating a nested configuration where touch functionality is embedded within the display structure rather than added as separate external layers.
Solution Approach 2:
By moving touch lines to the fourth layer (vertical dimension) rather than routing them through the substrate plane, the patent achieves compact integration that reduces overall screen thickness while maintaining structural integrity through the layered architecture.
3Adaptability or versatility
If touch signal lines are embedded into TFT array, then time-sharing display and touch function is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the touch unit structure into distinct electrode blocks arranged in arrays within each touch unit. This segmentation allows independent optimization of touch sensing areas and simplifies the alignment process by breaking down complex continuous patterns into discrete, easier-to-manufacture units.
Solution Approach 2:
By separating touch lines into a dedicated fourth layer rather than integrating them within the same layer as TFT components, the patent reduces the alignment precision requirements. The vertical stacking approach provides natural alignment references through the layered structure itself, making manufacturing more feasible.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the realization of large-size touch screens with improved signal-to-noise ratio and light efficiency, effectively addressing the challenges of pixel charging and signal attenuation in ADS pixel structures.
Implementation Method 1
The array substrate includes a thin film transistor, a passivation protection layer, a pixel electrode, and an insulating protection layer. The thin film transistor is disposed on the base substrate, the passivation protection layer is disposed on the thin film transistor
Implementation Method 2
receive a touch voltage from the plurality of touch lines within a second time period, to detect a change in capacitance of the plurality of touch lines, and determine a touch position
Implementation Method 3
the passivation protection layer is disposed on the thin film transistor, the pixel electrode is disposed on the passivation protection layer, the insulating protection layer is disposed on the pixel electrode
Data Source
AI summary
An array substrate includes: a plurality of touch units arranged in an array and insulated from each other; each of the plurality of touch units including at least one electrode block arranged in an array and connected to each other; and a plurality of touch lines; wherein the touch units and the touch lines are connected in a one-to-one correspondence by direct overlap. Also disclosed are a touch display panel and a method for manufacturing the array substrate.