Transparent Display Undercut Structure for Electrode Separation
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Solution Overview
Problem
Transparent display devices face challenges in maintaining high light transmittance due to the presence of touch sensors and touch lines, which complicate the manufacturing process and reduce light transmission efficiency.
Innovation Solution
A transparent display device design that incorporates a substrate with transmissive and non-transmissive areas, featuring a first undercut structure along the edge of the transmissive area to separate the cathode electrode from the touch sensor electrode, minimizing the overlap and interference of touch lines with light emission areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensors and touch lines are added to implement touch function, then touch capability is improved, but light transmittance is reduced and manufacturing complexity increases
Solution Approach 1:
The touch sensor electrode is extracted and positioned in the transmissive area while the cathode electrode is removed from the transmissive area through the first undercut structure. This separation extracts the touch sensing function from the light-emitting structure, allowing touch capability to be maintained while light transmittance is improved by eliminating the cathode electrode's light-blocking effect in the transmissive region.
Solution Approach 2:
The first undercut structure creates a vertical separation (in the Z-dimension) between the touch sensor electrode and the light emitting elements. By positioning the touch sensor electrode above the encapsulation layer while removing the cathode electrode from the transmissive area, the patent utilizes vertical stacking to resolve the conflict between touch functionality and light transmittance.
2Adaptability or versatility
If touch sensors and touch lines are added to implement touch function, then touch capability is improved, but device complexity increases
Solution Approach 1:
The first undercut structure merges the functions of separating the cathode electrode from the transmissive area and providing structural support for the touch sensor electrode. By combining these functions into a single structural feature, the patent reduces manufacturing complexity while still achieving the necessary electrode separation and touch sensor positioning.
Solution Approach 2:
The first undercut structure serves multiple purposes: it separates the cathode electrode from the transmissive area, provides a platform for the touch sensor electrode, and contributes to the overall structural integrity of the display device. This multi-functionality reduces the need for additional separate structures, thereby simplifying the manufacturing process.
3Area of stationary object
If cathode electrode is extended into transmissive area, then light emitting area is increased, but short-circuit risk with touch sensor electrode increases
Solution Approach 1:
The cathode electrode is extracted from the transmissive area through the first undercut structure, which removes the light-blocking cathode electrode material from the transmissive region while maintaining the light emitting functionality through the light emitting elements positioned below. This extraction eliminates the short-circuit risk while preserving the necessary light emission area.
Solution Approach 2:
The first undercut structure acts as an intermediary between the cathode electrode and the touch sensor electrode, creating a physical separation that prevents direct contact and potential short-circuits. This intermediary structure allows both electrodes to exist in the device without compromising reliability.
Data Source
AI summary
A transparent display device is provided, which may reduce loss of light transmittance due to a touch sensor and a touch line and may make sure of separating a touch sensor electrode of a touch sensor from a cathode electrode of a light emitting element. The transparent display device includes a substrate provided with a plurality of transmissive areas and a non-transmissive area including a plurality of light emission areas, a plurality of light emitting elements respectively disposed in the plurality of light emission areas on the substrate, including an anode electrode, a light emitting layer and a cathode electrode, a plurality of touch sensors respectively disposed in the plurality of transmissive areas on the substrate, including a touch sensor electrode, and a first undercut structure disposed along an edge of the transmissive area to separate the cathode electrode from the touch sensor electrode, including a plurality of eaves.