Transparent Display Power-Line Layout for Higher Light Transmittance
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Solution Overview
Problem
Transparent display devices face limitations in enhancing light transmittance due to the presence of multiple signal lines in non-transmissive areas, which obstruct external light transmission.
Innovation Solution
The transparent display device incorporates a substrate with a display area and non-display areas, featuring first and second non-display areas, first and second common power electrodes, and initialization lines that electrically connect these electrodes, along with signal lines on different layers to optimize light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple signal lines are disposed in the non-transmissive area, then electrical connection and power supply are achieved, but light transmittance is reduced
Solution Approach 1:
The patent merges the common power line function with the initialization line by making the initialization line serve dual purposes: initializing subpixels during initialization period and supplying common power voltage during emission period. This eliminates the need for a separate common power line in the display area, reducing the number of signal lines in the non-transmissive area and thereby improving light transmittance while maintaining electrical connection reliability
Solution Approach 2:
The initialization line is designed to perform multiple functions: it initializes the gate electrode during the initialization period and subsequently serves as the common power line to supply power voltage to subpixels during the emission period. This multi-functionality reduces the total number of lines needed in the non-transmissive area, directly addressing the contradiction between electrical connection requirements and light transmittance
2Reliability
If a separate common power line is added in the display area, then power supply reliability is improved, but the transmissive area size is reduced
Solution Approach 1:
The patent combines the common power line and initialization line into a single line structure where the initialization line serves both purposes. By eliminating the separate common power line, the transmissive area size is maximized while power supply reliability is maintained through the dual-function initialization line that supplies common power voltage during emission period
3Reliability
If signal lines are arranged to cover entire display area, then electrical connectivity is ensured, but light transmission is obstructed
Solution Approach 1:
The patent utilizes the temporal dimension by making the initialization line serve different functions at different times: initialization function during initialization period and power supply function during emission period. This time-based differentiation allows a single line to replace multiple lines, reducing spatial occupation in the non-transmissive area and improving light transmission while maintaining electrical connectivity
Data Source
AI summary
A transparent display device may improve light transmittance. The transparent display device comprises a substrate provided with a display area on which a plurality of subpixels are disposed, a first non-display area disposed at a first side of the display area and a second non-display area disposed at a second side facing the first side, a first common power electrode extended from the first non-display area in a first direction, a second common power electrode extended from the second non-display area in the first direction, and an initialization line extended from the display area in a second direction, electrically connecting the first common power electrode with the second common power electrode and supplying an initialization voltage to each of the plurality of subpixels.