Display Substrate Dummy Transistors Under-screen Camera Brightness
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Solution Overview
Problem
In OLED display products with under-screen cameras, the arrangement of driving circuitries at the periphery causes deviations in transistor characteristics, leading to abnormal display brightness and a visible bright ring, affecting the overall display effect.
Innovation Solution
A display substrate with a base substrate divided into regions, including normal and dummy driving circuitries, signal lead-out lines, and test pads, where dummy transistors are used to monitor and adjust the compensation structure to mitigate transistor deviations, ensuring uniformity and reducing layout complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driving circuitries are arranged at the periphery of the under-screen camera region to achieve narrow bezel and full-screen display, then the display area is increased, but transistor characteristic deviations occur causing abnormal display brightness and visible bright rings
Solution Approach 1:
The patent applies local quality by dividing the display region into a first region (under-screen camera region) and a second region (surrounding region), and further dividing the second region into multiple zones with different compensation structures. Each zone has tailored compensation characteristics to address local transistor deviations caused by different distances from the under-screen camera region, thereby improving transistor characteristic uniformity across the entire display area.
2Manufacturing precision
If compensation structures are added to mitigate transistor deviations, then display uniformity is improved, but the internal structure and layout complexity increase
Solution Approach 1:
The patent segments the compensation structure into multiple discrete zones corresponding to different regions of the display. Each zone contains compensation elements arranged in specific patterns, allowing independent optimization of each region without affecting the entire display structure. This segmentation simplifies the design and fabrication process while achieving comprehensive compensation across the display area.
Data Source
AI summary
A display substrate, inspection method thereof, and display device are provided. The display substrate includes a base substrate including a first region and a second region. The second region includes multiple driving circuitries, which include multiple normal driving circuitries and multiple dummy driving circuitries; the dummy driving circuitries each include a dummy driving transistor, and some of the normal driving circuitries are for driving an anode pattern in the first region; the multiple driving circuitries are divided into multiple driving circuitry columns, which are sequentially arranged in a nested manner and all surround the first region. The display substrate further includes multiple signal lead-out lines and multiple test pads, and the signal lead-out lines are coupled to corresponding test pads; in at least some of the driving circuitry columns, electrodes of a target dummy driving transistor in a target dummy driving circuitry are coupled to corresponding signal lead-out lines, respectively.