Micro-LED Display Panel Touch Structure for Accurate Position Sensing
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Solution Overview
Problem
Micro-LED touch display panels face issues with inaccuracy in touch position detection due to parasitic capacitance and high production costs in existing touch screen processes, such as in-cell and on-cell touch technologies.
Innovation Solution
A display panel design with a capacitive touch sensing structure positioned on the same side as the micro light-emitting devices, separated by a light-shielding layer and planarization layer, and electrically connected through conductive through-holes to a driving array layer, avoiding interference from parasitic capacitance and simplifying manufacturing.
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 provides accurate touch sensing with reduced complexity and lower costs by isolating the capacitive touch sensing structure from micro-LEDs, enhancing sensitivity and reducing manufacturing challenges.
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.