Micro-LED Display Panel Touch Structure for Accurate Capacitive Sensing
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Solution Overview
Problem
Micro-LED touch display panels face inaccuracies due to parasitic capacitance and high production costs associated with existing touch screen production processes, particularly in-cell and on-cell touch methods.
Innovation Solution
A display panel design incorporating a capacitive touch sensing structure integrated with a driving array layer, featuring a light-shielding layer and conductive through-holes to isolate micro light-emitting devices, allowing for accurate and cost-effective touch sensing by avoiding parasitic capacitance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If in-cell touch structure is applied to micro-LED displays, then touch functionality is achieved, but touch position accuracy deteriorates due to parasitic capacitance in micro-LEDs
Solution Approach 1:
The patent extracts the touch sensing function from the micro-LED display structure itself and implements it as a separate capacitive touch sensing structure on the same side as the micro-LEDs. This separation eliminates the parasitic capacitance interference from micro-LEDs while maintaining touch functionality, thereby resolving the contradiction between achieving touch functionality and maintaining touch position accuracy.
2Adaptability or versatility
If on-cell touch process is used, then touch sensing capability is achieved, but manufacturing complexity and production cost increase due to fabrication of sensing circuits on external glass substrate
Solution Approach 1:
The patent merges the touch sensing structure with the micro-LED display structure by positioning both on the same side of the display substrate. The capacitive touch sensing structure shares the same substrate and electrical connection system with the micro-LEDs, eliminating the need for separate sensing circuits on external glass substrates. This integration reduces manufacturing process complexity and production cost while maintaining touch sensing capability.
3Device complexity
If capacitive touch sensing structure is placed close to micro light-emitting devices, then manufacturing complexity is reduced, but sensing accuracy may be affected by interference
Solution Approach 1:
The patent introduces a light-shielding layer as an intermediary between the capacitive touch sensing structure and the micro light-emitting devices. This light-shielding layer serves as a mediator that blocks optical interference from the micro-LEDs while allowing the capacitive sensing structure to remain close to the display elements for simplified manufacturing. The light-shielding layer thus enables both reduced manufacturing complexity and maintained sensing accuracy.
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
The solution enables precise and cost-effective touch sensing by isolating the capacitive touch sensing structure from micro light-emitting devices, reducing inaccuracies and production complexities, thus improving the compatibility of micro-LED touch display panels with high precision and low manufacturing difficulty.
Implementation Method 1
the capacitive touch sensing structure is electrically connected to the driving array layer
Implementation Method 2
a light-shielding layer, which is arranged between the multiple micro light-emitting devices and exposes sides of the multiple micro light-emitting devices facing away from the driving array layer
Data Source
AI summary
A display panel, a preparation method thereof, and a display device are provided. The display panel includes a display substrate and a capacitive touch sensing structure. The display substrate includes a driving array layer and multiple micro light-emitting devices, and the multiple micro light-emitting devices are in contact with and electrically connected to the driving array layer. The capacitive touch sensing structure is located at a side of the driving array layer adjacent to the multiple micro light-emitting devices and spaced apart from the multiple micro light-emitting devices, and is electrically connected to the driving array layer. It has the characteristics of simple structure, low cost and accurate sensing.