P-Type Shift Register Circuit for Narrow-Frame Display Panels
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Solution Overview
Problem
The circuit structure of shift registers in display panels is complex, requiring numerous transistors, including both N-type and P-type, which affects reliability and occupies a large frame width, making narrow frame designs difficult.
Innovation Solution
The shift register design includes a driving unit and a gating unit with simplified internal structure, using P-type transistors only, and controlling output signals through multiple nodes to reduce complexity and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional shift register circuit structure is used with N-type and P-type transistors, then the circuit can achieve basic shift function, but the device complexity increases and reliability decreases
Solution Approach 1:
The patent applies homogeneity by using only P-type transistors throughout the shift register circuit, eliminating the need for both N-type and P-type transistors as in traditional designs. This uniform transistor type simplifies the circuit structure, improves reliability by reducing variability, and maintains the essential shift register functionality through carefully designed control nodes and signal paths.
2Length of stationary object
If traditional shift register with multiple transistor types is used, then the shift function is achieved, but the frame width occupied is large
Solution Approach 1:
By using only P-type transistors, the patent reduces the variety of components that need to be arranged, allowing for a more compact and simplified layout that occupies less frame width while maintaining the shift register's operational capabilities.
3Length of stationary object
If simplified shift register structure is used, then the frame width is reduced, but the operational reliability must be maintained
Solution Approach 1:
The homogeneous P-type transistor design reduces frame width while maintaining reliability through consistent device characteristics and simplified signal control mechanisms.
Solution Approach 2:
The patent incorporates feedback mechanisms through control nodes that monitor and adjust signal levels, ensuring reliable operation despite the simplified structure. The control nodes provide feedback control to maintain proper signal transitions and prevent errors in the shift register operation.
Data Source
AI summary
A display panel includes a shift register including stages of shift circuits arranged in cascade. At least one of the shift circuits includes a driving unit and a gating unit. The driving unit has a first node and a second node, outputs a second level when a potential of the first node is a first level, and outputs the first level when a potential of the second node is the first level. The gating unit includes a first control module and a gating output module. The first control module writes a signal of the first node into a third node when a frequency control signal received by the first control module is the first level. The gating output module outputs the second level when a potential of the third node is the first level and output the first level when a potential of the second node is the first level.