In-cell Touch Display Panel Electrode Inversion
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Solution Overview
Problem
The conventional in-cell touch display panel manufacturing process requires multiple masks and drilling processes, leading to high production costs and inefficiencies, while also compromising touch performance and product quality.
Innovation Solution
The in-cell touch display panel design reverses the positions of the pixel and common electrode layers, with the common electrode layer as the touch sensor on top and the pixel electrode layer below, eliminating the need for drilling through both the protective and planarization layers, reducing the number of masks and processes required, and enhancing touch sensitivity and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional IMI architecture with patternized touch sensing electrodes and through holes is used, then the touch function can be realized, but the manufacturing process requires more masks and more technical processes resulting in higher production cost
Solution Approach 1:
The patent inverts the conventional IMI architecture by placing the common electrode layer as the touch sensor on top of the top insulating layer, while the pixel electrode layer is positioned below. This inversion eliminates the need for drilling through holes through both protective and planarization layers, as the touch sensing structure is formed at the top surface. The invention thus resolves the contradiction by simplifying the manufacturing process (reducing masks and drilling operations) while maintaining the touch sensing function through the inverted electrode arrangement
2Reliability
If the conventional IMI architecture with multiple drilling processes is used, then the touch function can be realized, but the production efficiency is reduced
Solution Approach 1:
By inverting the electrode layer positions and forming the touch sensing structure at the top surface rather than requiring through-hole drilling through multiple layers, the patent eliminates complex multi-step drilling processes. This inversion allows for simpler, more efficient manufacturing while preserving the capacitive touch sensing function through the top-positioned common electrode layer with touch sensing electrode patterns
3Device complexity
If the common electrode layer is positioned at the bottom as in conventional design, then the display structure is simplified, but the touch sensitivity and signal-to-noise ratio are compromised
Solution Approach 1:
The patent applies inversion by positioning the common electrode layer as the touch sensor on top of the top insulating layer, closer to the touch surface, rather than at the bottom. This top-positioning enhances touch sensitivity by reducing the distance between the sensing electrode and the finger, and improves the signal-to-noise ratio by placing the touch sensing structure above interfering elements. The display structure remains integrated through the inverted arrangement of pixel and common electrode layers
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 reduces production costs, improves production efficiency, and enhances touch performance and product quality by optimizing the sensitivity and signal-to-noise ratio, while also thinning the display panel and reducing noise coupling capacitance.
Implementation Method 1
The operating principle of the in-cell touch display panel is that the capacitive amount sensed by the touch sensing electrode is different before and after the finger touches panel, and the integrated chip detects the finger touching position by detecting the capacitance change amount
Data Source
AI summary
The invention provides a touch display panel and an electronic device, with the positions of pixel electrode layer and common electrode layer at the side of array substrate in conventional touch display panel changed; wherein common electrode layer (21) as touch sensor is changed to the top, and pixel electrode layer (16) is changed to below common electrode layer (21). Pixel electrode (16) is connected to source/drain (145) of TFT (14) via first through hole (V1) penetrating planarization layer (15), which requiring only to drill planarization layer without the need to drill both the protective layer and planarization layer as in prior art to achieve connecting pixel electrode to TFT. The invention saves a mask, a drilling process and production cost and improves production efficiency. Moreover, placing common electrode (21) as touch sensor at the top facilitates optimizing sensitivity and SNR, thereby improves touch performance and product quality.