Touch Electrode Opening Layout for Low-Visibility Display Panels
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Solution Overview
Problem
In display panels, particularly organic light-emitting display panels, touch electrodes can reflect external light and become visible, especially in areas with lost mesh shapes of the light-blocking layer, leading to visibility issues.
Innovation Solution
The display panel design includes a substrate with sub-display areas and transmission areas, a touch electrode layer with specific openings, and a light-blocking layer with strategically arranged openings, along with touch insulating layers and an overcoat layer to minimize the visibility of touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-blocking layer is designed with a mesh shape to improve light transmittance in transmission areas, then light transmittance is improved, but the mesh shape may be lost in some areas causing touch electrodes to reflect external light and become visible
Solution Approach 1:
A filling layer is introduced as an intermediary between the light-blocking layer and the touch electrode layer. This filling layer fills the gaps and defects in the mesh-shaped light-blocking layer, preventing external light from reaching and reflecting off the touch electrode while maintaining the overall light transmittance performance of the transmission area.
Solution Approach 2:
The optical properties of the layer structure are modified by changing the material composition and optical characteristics of the filling layer. The filling layer is designed with specific optical parameters to block reflected light while allowing transmitted light to pass through, thus resolving the contradiction between light transmittance and reflection prevention.
2Ease of operation
If the touch electrode layer is made visible to improve touch sensitivity and interaction, then touch functionality is improved, but external light reflection makes the touch electrode visible and affects display appearance
Solution Approach 1:
The filling layer serves as a mediator that shields the touch electrode layer from external light while allowing the touch electrode to maintain its functional visibility for user interaction. This intermediary layer blocks the harmful reflected light path without interfering with the touch sensing function.
Solution Approach 2:
The layer structure is segmented into functional zones: the light-blocking layer for light management, the filling layer for gap filling and reflection prevention, and the touch electrode layer for user interaction. Each layer performs its specific function independently, allowing the touch electrode to be visible for functionality while preventing external light reflection.
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 the visibility of touch electrodes by strategically arranging openings and layers, enhancing light transmittance and preventing external light reflection, thus improving the overall appearance and functionality of the display panel.
Implementation Method 1
a light-blocking layer disposed on the touch electrode layer, where the light-blocking layer defines a first first upper opening overlapping the first first opening, a first second upper opening overlapping the first second opening, and a second second upper opening overlapping the second second opening
Implementation Method 2
the touch electrode layer defines a first first opening overlapping one of the plurality of sub-display areas and a first second opening and a second second opening overlapping two transmission areas
Data Source
AI summary
A display panel includes a substrate including sub-display areas and transmission areas, display elements disposed on the substrate to correspond to the sub-display areas, respectively, a touch electrode layer disposed on the display elements, where the touch electrode layer defines a first first opening overlapping one of the sub-display areas and a first second opening and a second second opening overlapping two transmission areas of the transmission areas, respectively, where the first second opening and the second second opening is adjacent to the first first opening. The first second opening is arranged in a first direction with respect to the first first opening, the second second opening is arranged in a second direction with respect to the first first opening, and at least one selected from the first second opening and the second second opening is spatially connected to the first first opening.