Grid Antenna Display Substrate for Alignment and Transmittance
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Solution Overview
Problem
Existing display technologies face challenges in accurately aligning on-screen antennas, leading to pixel unit shielding, dark stripes, Moire patterns, and reduced optical transmittance due to the integration of antennas on encapsulation layers, with radiation efficiency limited to 2.8% and transmittance loss of 5-20%.
Innovation Solution
A display substrate design featuring a grid-like antenna positioned at the encapsulation layer with hollowed-out portions in the voltage line, ensuring that antenna projections align within these hollowed-out areas, allowing for improved radiation efficiency and optical transmittance without the need for additional metal grids in non-antenna regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an on-screen antenna is formed on a flexible thin film and attached to the display screen, then the antenna can be integrated into the display, but accurate alignment cannot be achieved in the semiconductor process, causing pixel unit shielding, dark stripes, and Moire patterns
Solution Approach 1:
The patent merges the antenna formation process with the display substrate manufacturing process by directly forming the antenna pattern on the same substrate using the same semiconductor fabrication techniques (photoetching). This integration eliminates the separate flexible thin film attachment step and achieves precise alignment through the semiconductor manufacturing process, resolving the alignment accuracy problem while maintaining antenna integration capability
2Stability of the object's composition
If a grid-like pattern is formed at non-antenna functional regions to alleviate optical transmittance decrease, then the transmittance uniformity is improved, but the overall transmittance of the display screen decreases by 5% to 20%
Solution Approach 1:
The patent applies local quality by forming the grid-like antenna pattern only in specific regions where antennas are needed, rather than uniformly across the entire display screen. The antenna pattern is localized to designated antenna regions, allowing non-antenna regions to maintain high optical transmittance without the 5-20% overall transmittance loss that would result from a universal grid pattern
3Manufacturing precision
If the antenna is integrated directly on the encapsulation layer, then accurate alignment can be achieved, but the radiation efficiency is limited to 2.8% due to the 10 μm distance from the cathode layer
Solution Approach 1:
The patent resolves the radiation efficiency problem by transitioning from a two-dimensional planar antenna structure to a three-dimensional elevated structure. The antenna is formed above the encapsulation layer at a height that optimizes radiation performance, creating a vertical dimension that improves radiation efficiency while maintaining the alignment accuracy benefits of direct integration
Data Source
AI summary
A display substrate includes a base substrate, a voltage line arranged at a peripheral region of the base substrate, an encapsulation layer arranged at a side of the voltage line away from the base substrate, and a plurality of pixel units arranged at a display region of the base substrate. The encapsulation layer is arranged at a part of the display region and the peripheral region of the base substrate. The display substrate further includes an antenna arranged at a side of the encapsulation layer away from the base substrate, the antenna is a grid-like antenna, the voltage line is provided with a hollowed-out portion, and an orthogonal projection of at least a part of an end of the antenna onto the base substrate is located within an orthogonal projection of the hollowed-out portion onto the base substrate.