Shift Register Unit Black Insertion Control for Display Gate Drive
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Solution Overview
Problem
Existing gate drive circuits are unable to control pixel circuits to achieve the black insertion/black frame insertion function, leading to image smear during motion picture switching processes.
Innovation Solution
A shift register unit with a pull-up module, a reset and leakage prevention composite module, and a charging module, which includes a current-limiting circuit, is used to control the pixel circuit by managing the potential of the pull-up node and black insertion node, enabling effective black insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black picture is inserted in a display stage to solve image smear, then image smear is prevented, but existing gate drive circuits cannot control pixel circuit to achieve the black insertion function
Solution Approach 1:
The gate drive circuit is divided into functional modules including a black insertion control module, a pull-up module, and a reset module. Each module independently controls specific nodes (black insertion node, pull-up node, voltage control node) to achieve precise control over pixel circuit behavior during black insertion periods.
Solution Approach 2:
The circuit performs preliminary charging of the pull-up node and voltage control node before the black insertion period begins. The pull-up module charges the pull-up node in advance, and the reset module prepares the voltage control node, ensuring the pixel circuit is ready to switch to black display mode without delay.
2Productivity
If the light emission period is reduced to prevent image smear, then moving picture response time increases, but the charging and discharge control of nodes becomes more complex
Solution Approach 1:
The reset and leakage prevention functions are merged into a single composite module. The reset module simultaneously handles the discharge of the voltage control node and prevents leakage currents from affecting the pull-up node, reducing the number of separate control circuits needed while managing multiple nodes efficiently.
Solution Approach 2:
The voltage control node acts as an intermediary between the reset signal and the pixel circuit output. It mediates the discharge process by controlling the transfer of charge between nodes, simplifying the overall control logic while enabling precise timing for black insertion and normal display switching.
Data Source
AI summary
The present disclosure provides display apparatuses, gate drive circuits, shift register units and driving methods thereof. The shift register unit includes: an outputting module, configured to output a composite output signal under a control of a potential of a pull-up node; a pull-up module, configured to charge the pull-up node under a control of a display control signal terminal and charge the pull-up node under a control of a potential of a black insertion node; a first reset circuit configured to, under a control of the reset signal terminal and the potential of the black insertion node, control a voltage control node to communicate with the pull-up node; a current-limiting circuit, connected between the voltage control node and a first voltage terminal; and a charging module, configured to charge the voltage control node under the control of the potential of the pull-up node.