Transparent Display Pixel Layout for Transmissive and Emissive Areas
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Solution Overview
Problem
Transparent display devices have lower light transmittance in non-display areas due to the presence of signal lines, which limits the light emission area and overall transmittance.
Innovation Solution
A transparent display device design that includes a substrate with a display area and a non-display area, featuring anode electrodes with protruded portions to overlay metal lines, a common power line, and a cathode electrode made of low resistance metal, maximizing the transmissive area and light emission area in non-transmissive areas without reducing the emission area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are disposed in the non-display area, then electrical connectivity is ensured, but light transmittance in the non-display area is reduced
Solution Approach 1:
The patent extracts the harmful effect of metal lines by making them transparent or removing them from the light path. The anode electrode is designed to overlay and hide the metal lines, effectively taking out the obstruction from the optical path while maintaining electrical connectivity through the transparent substrate and conductive layers.
Solution Approach 2:
The patent applies transparency to the conductive elements, particularly the anode electrode and ITO layers, which are designed to be transparent or semi-transparent in the visible spectrum. This allows light to pass through the non-display area while maintaining electrical functionality, effectively changing the optical properties of the conductive materials.
2Reliability
If metal lines are present in the display area, then power supply is ensured, but diffraction occurs reducing display quality
Solution Approach 1:
The patent converts the harmful diffraction effect into a benefit by using the anode electrode to overlay and hide the metal lines. The metal lines that cause diffraction are positioned underneath the transparent anode electrode, which blocks the diffraction effect while allowing the metal lines to continue providing electrical power supply.
3Illumination intensity
If transmissive area is increased, then light transmittance is improved, but light emission area in non-transmissive area is reduced
Solution Approach 1:
The patent resolves this contradiction by using multiple overlapping layers in the vertical dimension. The anode electrode, bank, and spacer are arranged in different layers, allowing the transmissive area to be maximized in the display area while the light emission area is maintained in the non-transmissive area through the vertical stacking of functional elements.
Data Source
AI summary
A transparent display device is disclosed, which may have high light transmittance in a non-display area as well as a display area, and may increase or maximize a light emission area in a non-transmissive area. The transparent display device comprises a substrate provided with a display area, in which a plurality of subpixels are disposed, and a non-display area adjacent to the display area, anode electrodes provided in each of the plurality of subpixels over the substrate, a light emitting layer provided over the anode electrodes, a cathode electrode provided over the light emitting layer, a pixel power line provided over the substrate and extended in the display area in a first direction, and a common power line provided over the substrate and extended in the display area in the first direction. The display area includes a non-transmissive area provided with the common power line and the pixel power line, and a transmissive area provided between the common power line and the pixel power line.