Display Substrate Shift Register Layout for Thin Bezel Panels
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Solution Overview
Problem
Existing display substrates face challenges in achieving a narrow frame design and ensuring display quality due to space congestion and excessive parasitic capacitance caused by complex wire arrangements and unnecessary overlap in the shift register unit architecture.
Innovation Solution
The display substrate incorporates a shift register unit with a optimized circuit connection and structural layout, featuring a continuous control semiconductor layer for the control transistors and a unique arrangement of transistors and capacitors that reduces the length of the shift register unit in the second direction, thereby minimizing space and signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a contact hole formation process and a pixel electrode formation process are separately performed, then each process can be optimized independently, but the number of process steps increases and manufacturing complexity increases
Solution Approach 1:
The patent combines the contact hole formation process and pixel electrode formation process into a single integrated process step. The pixel electrode pattern is formed simultaneously with the contact hole through one photolithography and etching sequence, eliminating the need for separate process steps while maintaining the precision of contact hole formation.
Solution Approach 2:
The pixel electrode pattern serves dual functions: it defines the pixel electrode structure and simultaneously defines the contact hole positions. This multi-functional pattern reduces the number of required process steps while ensuring precise alignment between contact holes and pixel electrodes.
2Ease of manufacture
If separate processes are used for contact hole and pixel electrode formation, then process control is easier, but manufacturing time and productivity are reduced
Solution Approach 1:
The patent merges contact hole formation and pixel electrode formation into one process sequence, reducing total manufacturing time and increasing productivity. The integrated process maintains ease of control through standardized photolithography and etching parameters.
Solution Approach 2:
The pixel electrode pattern is designed to pre-define contact hole positions, so that contact holes are automatically formed at correct locations during the pixel electrode formation process. This preliminary positioning action eliminates subsequent alignment steps and reduces overall process time.
3Adaptability or versatility
If conventional separate processes are used, then process flexibility is maintained, but the risk of dust contamination and manufacturing defects increases
Solution Approach 1:
By combining contact hole and pixel electrode formation into one process, the patent reduces the number of times the substrate is exposed to the environment, thereby minimizing dust contamination opportunities. The single integrated process maintains flexibility while improving reliability.
Solution Approach 2:
The patent rushes through the formation process by completing both contact holes and pixel electrodes in one sequence, minimizing the time substrates are exposed to potential contaminants. This rapid integrated formation reduces defect rates compared to multiple separate processes.
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~2A
AI summary
A display substrate, a manufacturing method therefor, and a display apparatus. The display substrate comprises: a base substrate as well as a shift register unit and a first clock signal line arranged on the base substrate, the first clock signal line extends along a first direction on the base substrate and is configured to provide a first clock signal to the shift register unit; the shift register unit comprises an input circuit, an output circuit, a first control circuit, and an output control circuit; the first control circuit comprises a first control transistor and a second control transistor, an active layer of the first control transistor and an active layer of the second control transistor are a continuous control semiconductor layer, the control semiconductor layer extends along the first direction, and a gate electrode of the first control transistor and a gate electrode of the second control transistor extend along a second direction different from the first direction, and are arranged side-by-side on the first direction. The display substrate optimizes circuit structure layout, which facilitates achieving display panel thin bezel design.