Embedded Touchscreen LCD Panel with Semiconductor Layer
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Solution Overview
Problem
Existing LCD panels face challenges in integrating a touchscreen function without increasing thickness, which affects appearance and functionality.
Innovation Solution
An embedded touchscreen component is integrated within the LCD panel, comprising a first and second conductive line with a semiconductor layer between them, utilizing the turn-on voltage of the gate line to detect touch events by generating a threshold current only when a touch occurs, allowing for localized positioning of the touched area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch screen panel is attached externally to the surface of the color filter substrate, then the touchscreen function is enabled, but the thickness increases and appearance is adversely affected
Solution Approach 1:
The patent merges the touchscreen component with the LCD panel by integrating the sensing transistor and conductive lines directly onto the color filter substrate within the LCD panel structure, eliminating the need for an external touch screen panel attachment while maintaining touchscreen functionality
Solution Approach 2:
The touchscreen component is nested within the LCD panel structure by placing the sensing transistor and conductive lines inside the existing panel layers, specifically on the color filter substrate, allowing the touchscreen function to be embedded without increasing overall thickness
2Length of stationary object
If an embedded touchscreen component is integrated within the LCD panel, then the thickness is maintained, but the device complexity increases
Solution Approach 1:
The color filter substrate serves multiple functions: it acts as both the color filter layer for display and as the base substrate for the touchscreen sensing transistor, reducing the need for separate dedicated touchscreen layers and simplifying the overall structure
Solution Approach 2:
The gate line of the LCD panel serves dual purposes: it performs its original function of controlling liquid crystal pixels and simultaneously acts as the gate electrode for the touchscreen sensing transistor, eliminating the need for separate gate electrodes and reducing structural complexity
3Adaptability or versatility
If the sensing transistor is disposed on the color filter substrate, then the touchscreen function is integrated, but the display quality may be affected
Solution Approach 1:
The sensing transistor is positioned in specific localized areas on the color filter substrate where it does not interfere with the display pixel regions, allowing touchscreen functionality to be implemented in non-critical areas while maintaining display quality in the pixel regions
Solution Approach 2:
The insulating layer is introduced as an intermediary between the sensing transistor components and the liquid crystal layer, preventing electrical interference and ensuring that the touchscreen component does not affect the liquid crystal switching and display quality
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
Enables the LCD panel to function with an embedded touchscreen without affecting display quality, providing sensitive touch detection and accurate positioning while maintaining a slim profile.
Implementation Method 1
the on-state current of the semiconductor layer becomes no less than the threshold current of the data processing unit due to the gate line turn-on voltage in case of touching
Data Source
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AI summary
The present disclosure relates to an LCD panel and a driving method thereof for realizing the embedded touchscreen function of such a LCD panel. The LCD panel according to the present disclosure comprises: an array substrate, a color filter substrate and a layer of liquid crystal provided between the two substrates, with gate lines and data lines are formed on the array substrate to define pixel units. An embedded touchscreen component is provided on the inner side of the array substrate, comprising: a first conductive line and a second conductive line. The first conductive line and the second conductive line constitute a two-layer structure, with a semiconductor layer being provided between the first conductive line and the second conductive line within the overlapping area of the two lines.