Transparent Display Touch Sensor Shielding Layer Design
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Solution Overview
Problem
Transparent display devices face challenges in forming touch sensors and lines, leading to reduced light transmittance and interference issues that affect image quality and touch sensing accuracy due to the complexity of the manufacturing process and noise from overlapping electrodes.
Innovation Solution
A transparent display device design that includes a substrate with a transmissive and non-transmissive area, featuring subpixels with light emitting elements, touch sensors in the transmissive area, touch lines between the substrate and anode electrode, and a shielding layer between the touch lines and anode electrode to minimize parasitic capacitance and light transmittance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple touch sensors and touch lines are formed in the transparent display device, then touch functionality is implemented, but light transmittance is reduced and manufacturing complexity increases
Solution Approach 1:
The patent positions touch lines in the non-transmissive area (below the light emitting element) rather than in the transmissive area, utilizing the vertical dimension and existing non-transmissive space. This dimensional repositioning allows touch functionality to be implemented without blocking light transmission paths in the transmissive area, thus resolving the contradiction between touch functionality and light transmittance.
Solution Approach 2:
The patent introduces a shielding layer as an intermediary element between the touch line and the anode electrode. This shielding layer reduces parasitic capacitance and electromagnetic interference, enabling reliable touch sensing through the non-transmissive area without requiring additional touch sensors in the transmissive area, thereby maintaining high light transmittance while achieving touch functionality.
2Adaptability or versatility
If multiple electrodes and driving lines are disposed in a narrow area, then image display and touch sensing are integrated, but noise and interference increase affecting image quality and touch sensing accuracy
Solution Approach 1:
The patent extracts the touch sensing function from the transmissive area and relocates it to the non-transmissive area. By taking out the touch line formation from the light transmission path and placing it in the non-transmissive area below the light emitting element, the patent separates the electromagnetic interference sources from the image display area, thereby reducing noise and interference while maintaining integrated functionality.
Solution Approach 2:
The shielding layer serves as an intermediary that isolates the touch line from the anode electrode and other signal lines. This intermediary structure reduces parasitic capacitance and electromagnetic coupling between adjacent conductors, improving both image quality by reducing display interference and touch sensing accuracy by reducing capacitive noise.
3Device complexity
If touch lines are positioned closer to the anode electrode, then device structure is simplified, but parasitic capacitance increases affecting touch sensing accuracy
Solution Approach 1:
The patent introduces a shielding layer as an intermediary between the touch line and the anode electrode. This shielding layer acts as an electromagnetic shield that reduces parasitic capacitance coupling between the touch line and the anode electrode, allowing the touch line to be positioned in the non-transmissive area close to the light emitting element without degrading touch sensing accuracy. The shielding layer maintains electrical isolation while enabling structural simplification.
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 touch performance and maintains high light transmittance by reducing parasitic capacitance and noise, improving image quality and touch sensing accuracy while simplifying the manufacturing process.
Implementation Method 1
a shielding layer provided between the touch line and the anode electrode in the non-transmissive area
Implementation Method 2
a light emitting element consisting of an anode electrode, a light emitting layer and a cathode electrode
Data Source
AI summary
A transparent display device with a touch sensor can include a plurality of subpixels disposed in a non-transmissive area of a substrate, the plurality of subpixels including a light emitting element having an anode electrode, a light emitting layer and a cathode electrode; a touch sensor disposed in a transmissive area of the substrate, the touch sensor including a touch sensor electrode. Also, the transparent display device can include a touch line disposed between the substrate and the anode electrode in the non-transmissive area, the touch line being configured to supply a touch sensing voltage to the touch sensor; and a shielding layer disposed between the touch line and the anode electrode in the non-transmissive area.