Display Substrate Vertical TFT Auxiliary Light Transmittance
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Solution Overview
Problem
Current display technologies face challenges in maximizing the screen-to-body ratio of display devices due to the limited light transmittance in auxiliary display areas, which hinders the integration and functionality of optical devices like cameras and infrared emitters.
Innovation Solution
A display substrate design with a main display area and auxiliary display areas, featuring a higher density of first sub-pixels in the main area and lower density of second sub-pixels in auxiliary areas, where each second sub-pixel includes a pixel driving circuit with a vertical thin film transistor and a capacitor, and the spaces between these circuits form a light-transmitting region, reducing the occupied area and enhancing light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If auxiliary display areas are designed with pixel driving circuits, then the functionality and integration of optical devices are enabled, but the light transmittance is reduced due to the occupied area by circuits
Solution Approach 1:
The patent transitions from horizontal arrangement of pixel driving circuits to vertical thin film transistors, utilizing the vertical dimension to reduce horizontal occupation area. The vertical TFT structure allows current flow in the vertical direction while minimizing the footprint in the plane of the display substrate, thereby increasing light transmittance through auxiliary display areas while maintaining circuit functionality.
Solution Approach 2:
The patent applies different sub-pixel densities to different display areas: high density first sub-pixels in the main display area for optimal image quality, and low density second sub-pixels in auxiliary display areas to maximize light transmittance. This local differentiation allows each area to be optimized for its specific function.
2Manufacturing precision
If the density of sub-pixels is increased in auxiliary display areas, then the display quality is improved, but the light transmittance is further reduced
Solution Approach 1:
The patent implements differential sub-pixel density across different display regions. The main display area maintains high sub-pixel density for superior image quality, while auxiliary display areas use low sub-pixel density to prioritize light transmittance. This localized optimization ensures each region performs its intended function effectively.
3Area of moving object
If pixel driving circuits are integrated in auxiliary display areas, then the screen-to-body ratio is improved, but the area occupied by circuits reduces the light transmittance
Solution Approach 1:
The patent employs vertical thin film transistors that extend in the vertical dimension perpendicular to the substrate plane, thereby minimizing the horizontal footprint of pixel driving circuits. This dimensional transition allows circuits to be integrated without significantly occupying the light-transmitting area in the plane of the display, thus maintaining high screen-to-body ratio while preserving light transmittance.
Solution Approach 2:
The vertical thin film transistor structure utilizes thin film layers stacked vertically, creating a compact configuration that occupies minimal planar space. This thin-film vertical architecture enables circuit integration while maximizing the open area for light transmission through auxiliary display regions.
Data Source
AI summary
A display substrate has a main display area and at least one auxiliary display area located beside the main display area. The display substrate includes a plurality of first sub-pixels located in the main display area, and a plurality of second sub-pixels located in each of the at least one auxiliary display area. A distribution density of the plurality of first sub-pixels in the main display area is greater than a distribution density of the plurality of second sub-pixels in each auxiliary display area. Each of the plurality of second sub-pixels includes a pixel driving circuit, and the pixel driving circuit includes at least one vertical thin film transistor. A space exists between every two adjacent pixel driving circuits, and a plurality of spaces constitute a light-transmitting region of the corresponding auxiliary display area.