Display Substrate Double Gate Structure for Touch Sensing
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Solution Overview
Problem
The manufacturing process for LCD panels with integrated sensing and switching elements is complex due to differing operating conditions, increasing the number of manufacturing steps and complicating the integration of infrared and visible light management.
Innovation Solution
A display substrate design featuring first and second light blocking patterns that block visible light while transmitting infrared, along with first and second semiconductor patterns, source and drain electrodes, and gate electrodes, which form a double gate structure for improved driving characteristics and reduced manufacturing complexity by using the same material for bottom gates of switching and sensing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensing element and switching element are integrated with different operating conditions, then touch sensing function is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the sensing element and switching element into a single integrated structure where the same semiconductor pattern serves dual purposes. The bottom gate electrode functions as both the sensing electrode and the switching gate, eliminating the need for separate structures and reducing manufacturing complexity while maintaining touch sensing capability.
Solution Approach 2:
The bottom gate electrode is designed to perform multiple functions simultaneously: it acts as the gate electrode for the switching element and as the sensing electrode for the touch sensing element. This multi-functional design reduces the total number of components and simplifies the manufacturing process while achieving both switching and touch sensing operations.
2Illumination intensity
If multiple light blocking patterns are used for infrared and visible light management, then light management performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the light blocking patterns into the same layer structure where the bottom gate electrode serves as the light blocking pattern. By forming the bottom gate electrode and light blocking pattern simultaneously using the same material and process, the patent achieves effective infrared and visible light management while reducing the number of separate manufacturing steps.
Solution Approach 2:
The bottom gate electrode is designed to simultaneously function as the gate electrode for switching operation and as the light blocking pattern for infrared and visible light management. This multi-functional design eliminates the need for separate light blocking layers and simplifies the manufacturing process while maintaining effective light management performance.
3Reliability
If different materials are used for switching and sensing elements, then operating characteristics are optimized, but manufacturing complexity increases
Solution Approach 1:
The patent uses the same material for the bottom gate electrode of both the switching element and the sensing element. This homogeneous material selection simplifies the manufacturing process by reducing the number of different materials that need to be deposited and processed, while still achieving reliable operating characteristics for both switching and sensing functions through optimized device structure and electrical design.
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 design enhances the driving characteristics of the sensing and switching elements, simplifies the manufacturing process by reducing the number of masks needed, and effectively manages infrared and visible light for touch and image scanning functions.
Implementation Method 1
a first light blocking pattern, configured to block visible light and transmit infrared light
Implementation Method 2
a first sensing element configured to detect the infrared light
Data Source
AI summary
A display substrate includes a first light blocking pattern formed on a base substrate, a first switching element, a second light blocking pattern formed on the base substrate, and a first sensing element. The first light blocking pattern is configured to block visible light and transmit infrared light. The first switching element includes a first semiconductor pattern, a first source electrode, a first drain electrode, and a first gate electrode. The second light blocking pattern is configured to block the visible light and transmit the infrared light. The first sensing element is configured to detect the infrared light, and includes a second semiconductor pattern, a second source electrode, a second drain electrode, and a second gate electrode.