Display Touch-Electrode Structure to Reduce Visible Touch Lines
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Solution Overview
Problem
Existing display devices face issues with touch lines being visible, invasion of organic layers into pad areas, reduced viewing angle, and decreased transmittance and color gamut.
Innovation Solution
The display device incorporates an organic structure on touch electrodes to minimize visibility of touch lines, uses an organic layer with high flowability to prevent invasion into pad areas, and employs a lens layer to enhance viewing angle and luminance efficiency, while removing inorganic films from emission areas to improve transmittance and color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are disposed on the encapsulation unit, then touch recognition function is provided, but touch lines become visible to users
Solution Approach 1:
An organic structure with different refractive index than the touch electrode material is formed at specific locations (on and around the touch electrodes) to locally modify optical properties. This creates a refractive index gradient that reduces the visibility of touch lines while maintaining the touch recognition function in the same area.
Solution Approach 2:
The organic structure acts as an intermediary layer between the touch electrodes and the external environment. It mediates the optical interaction by having a refractive index that is different from both the touch electrode material and the surrounding medium, thereby reducing the visibility of the touch electrodes without affecting their electrical function.
2Ease of manufacture
If organic layer with high flowability is used, then manufacturing process is simplified, but organic layer invades pad area
Solution Approach 1:
The organic structure is formed in advance on and around the touch electrodes before the organic layer is deposited. This pre-formed structure creates a physical barrier that prevents the high flowability organic layer from invading the pad area, while still allowing the organic layer to be deposited with high flowability for manufacturing simplicity.
Solution Approach 2:
The organic structure is prepared beforehand to define the boundaries where the organic layer should not invade. This preliminary structuring enables the subsequent organic layer deposition to proceed with high flowability while automatically confining the organic layer within desired boundaries through the pre-formed organic structure.
3Illumination intensity
If inorganic films are removed from emission area, then transmittance and color gamut are improved, but device protection is reduced
Solution Approach 1:
The encapsulation structure is designed with different properties in different areas: inorganic films are removed from the emission area to maximize transmittance and color gamut, while the organic structure and remaining inorganic encapsulation layers provide sufficient protection in these areas. The encapsulation unit maintains device protection through the combination of organic structure and selective inorganic layer retention in non-emission areas.
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 effectively reduces the visibility of touch lines, prevents organic layer overflow, enhances viewing angle and luminance, and improves transmittance and color gamut of the display device.
Implementation Method 1
it is possible to suppress the occurrence of a phenomenon by which the touch electrode can be seen by a user due to the refractive index of the organic structure
Implementation Method 2
a lens layer is formed to correspond to an emission area. Thus, it is possible to improve a viewing angle and enhance luminance efficiency
Data Source
AI summary
The present disclosure relates to a display device. A display device according to an exemplary embodiment of the present disclosure includes a substrate including an active area and a non-active area. The device includes a plurality of light emitting elements disposed in the active area of the substrate. The device includes an encapsulation unit disposed to cover the plurality of light emitting elements. The device includes a touch sensing unit disposed on the encapsulation unit and including a plurality of touch electrodes. The device includes an organic structure disposed on the plurality of touch electrodes to cover upper and side surfaces of the plurality of touch electrodes. Therefore, it is possible to suppress the occurrence of a phenomenon by which the plurality of touch electrodes can be seen by a user.