Shift Register Unit Circuit Area Reduction
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Solution Overview
Problem
Current shift register units in OLED display devices are complex and occupy large chip areas, failing to meet requirements for high resolution and narrow bezel, and suffer from abnormal displays due to short charging times during high-frequency driving.
Innovation Solution
A simplified shift register unit structure that shares circuits such as the inverter, pull-down, reset, and output circuits, reducing signal lines and chip area, and includes a feedback circuit to prevent signal leakage, thereby extending data writing time and improving display stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional shift register unit structure with separate detection subcircuit, display subcircuit, and connection unit is used, then the circuit functionality is complete, but the chip area becomes large and the structure becomes complicated
Solution Approach 1:
The patent merges the detection subcircuit and display subcircuit into a single integrated shift register unit structure. The detection input circuit and display input circuit share common components such as the inverter circuit, pull-down circuit, and output circuit, eliminating the need for separate connection units and reducing overall chip area while maintaining complete circuit functionality.
Solution Approach 2:
The inverter circuit serves multiple functions: it inverts the input signal for detection purposes, provides reset functionality through the reset circuit, and enables output signal generation through the pull-down circuit and output circuit. This multi-functional design reduces the number of separate circuits needed, thereby reducing chip area and structural complexity.
2Speed
If high-frequency driving is implemented to increase display refresh rate, then the display responsiveness improves, but the data writing time becomes insufficient causing abnormal display
Solution Approach 1:
The detection input circuit performs detection operations in advance during the display subcircuit's active period. By detecting the input signal early and preparing the output state beforehand, the circuit ensures that data is ready for writing when the display refresh occurs, thus maintaining sufficient data writing time even at high refresh rates.
Solution Approach 2:
The shift register unit maintains continuous operation through overlapping detection and display phases. The detection input circuit operates continuously to monitor input signals, while the display input circuit continuously prepares display data, ensuring that data writing is always ready when needed, thus supporting high-frequency driving without abnormal displays.
Data Source
AI summary
The present disclosure relates to the field of display technologies and, more particularly, to a shift register unit, a shift register circuit, and a display device. The shift register unit includes a detection input circuit, a display input circuit, an inverter circuit, a pull-down circuit, a reset circuit, and a first output circuit. In a working process of the shift register unit, the display input circuit and the detection input circuit share the inverter circuit, the pull-down circuit, the reset circuit, and the first output circuit.