Dynamic Shift Register Circuit for LCD Manufacturing
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Solution Overview
Problem
Existing liquid crystal display (LCD) shift registers, particularly those with CMOS configurations, face challenges in manufacturing throughput due to the need for more masks, resulting in higher production costs and complexity.
Innovation Solution
A dynamic shift register circuit utilizing a series of MOSFETs, either all PMOS or all NMOS, to simplify the manufacturing process and reduce the number of transistors required, implemented in a horizontal shift register (HSR) for generating overlapped output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CMOS configuration is used in the shift register, then the display quality is improved and delay time is reduced, but the number of masks required increases and manufacturing throughput decreases
Solution Approach 1:
The patent extracts and removes the CMOS configuration from the shift register circuit, eliminating the need for complementary transistor pairs. This extraction of the CMOS structure reduces the number of masks required in manufacturing while maintaining the essential shift register functionality through a simplified transistor-based design
Solution Approach 2:
The patent changes the fundamental parameter of transistor configuration from CMOS (complementary metal-oxide-semiconductor) to a single-type transistor architecture. This parameter change in the circuit structure eliminates the need for complex mask patterns associated with CMOS fabrication, thereby improving manufacturing throughput while preserving display quality
2Speed
If a CMOS configuration is used in the shift register, then the delay time is reduced, but the number of transistors increases and manufacturing complexity increases
Solution Approach 1:
The patent extracts and eliminates the CMOS transistor pairing structure, removing the complexity associated with implementing both NMOS and PMOS transistors. This extraction simplifies the device architecture while maintaining the speed performance through optimized single-type transistor circuits
3Ease of manufacture
If more masks are required in the manufacturing process, then the shift register can be implemented with CMOS configuration, but the production cost increases and throughput decreases
Solution Approach 1:
The patent extracts and removes the requirement for multiple CMOS masks from the manufacturing process. By eliminating the CMOS configuration, the patent reduces the mask count to essential patterns only, thereby simplifying the manufacturing process and significantly improving production throughput
Solution Approach 2:
The patent changes the manufacturing parameter from multi-mask CMOS fabrication to a simplified single-type transistor fabrication process. This parameter change in the manufacturing approach reduces process complexity and increases throughput while maintaining the functional capabilities of the shift register
Data Source
AI summary
Systems for displaying images are provided. An embodiment of such a system has a dynamic shift register. The dynamic shift register includes a first, second, third, fourth and fifth switching circuits and a level adjusting circuit. The first switching circuit controls if the first supply voltage is transmitted to a first node. When the first switching circuit is switched off, the level adjusting circuit drives a voltage level of the first node toward the second supply voltage. The second switching circuit controls if the first supply voltage is transmitted to a second node. The third switching circuit controls if the first input signal is transmitted to the second node. The fourth switching circuit controls if the first supply voltage is transmitted to the output terminal. The fifth switching circuit controls if the second input signal is transmitted to the output terminal.