Shift Register Unit for OLED Display with Blanking Circuit
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Solution Overview
Problem
Current gate driving circuits for OLED displays are complex and cannot meet the requirements for high resolution and narrow bezels, leading to issues like progressive scanning lines and uneven brightness due to progressive sequential compensation, which increases the size of the display device and costs.
Innovation Solution
A shift register unit with a blanking unit, first and second transmission circuits, and input-output units that share a blanking unit to reduce the size of the bezel and cost, while enabling random compensation to avoid scanning line and brightness issues, by using a blanking pull-up signal to charge pull-up nodes in response to transmission and display input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate driving circuit is integrated in a GATE IC to drive OLED display panels, then the display function is achieved, but the chip area increases leading to higher cost and larger display device size
Solution Approach 1:
The patent merges the blanking unit functionality into the existing shift register unit structure, combining multiple functions (display signal output and blanking signal output) into a single integrated unit. This is achieved by providing a blanking unit with a blanking pull-up circuit that shares the same structural framework as the display signal generation circuit, thereby reducing the overall chip area without compromising display functionality
Solution Approach 2:
The shift register unit is designed to serve multiple functions: it can output display signals during display phases and blanking signals during blanking phases through the same basic structure. The blanking pull-up circuit is configured to work within the existing shift register framework, allowing one circuit to perform both display driving and blanking functions, thus reducing the need for separate dedicated circuits
2Adaptability or versatility
If progressive sequential compensation is used to compensate for sub-pixel units, then compensation function is provided, but scanning lines and uneven brightness occur
Solution Approach 1:
The patent implements a switching mechanism that dynamically changes the compensation mode between progressive sequential compensation and random compensation based on operational requirements. A switching unit selectively connects different compensation paths, allowing the system to adapt its compensation strategy in real-time to avoid fixed scanning line patterns that cause visibility issues
Solution Approach 2:
The blanking unit incorporates a blanking pull-up circuit that provides feedback control for the compensation process. The circuit monitors and adjusts the compensation signals based on the operational state, ensuring that compensation is performed accurately without introducing scanning line artifacts or brightness不均匀ity
3Adaptability or versatility
If a blanking unit is added to enable blanking signal output, then blanking function is achieved, but device complexity increases
Solution Approach 1:
The blanking unit is merged with the shift register unit structure, sharing common components such as the pull-up nodes and transmission circuits. The blanking pull-up circuit uses the same basic transistor configuration as the display signal circuits, simply adding a control path for blanking signal generation without requiring entirely new circuit architecture
Solution Approach 2:
The existing shift register circuits are designed to serve dual purposes: generating display signals during display phases and blanking signals during blanking phases. The same pull-up nodes and transmission circuits are configured to handle both signal types through controlled activation, reducing the need for separate dedicated blanking circuits
Data Source
AI summary
A shift register unit, a gate driving circuit, a display device, and a driving method are disclosed. The shift register unit includes a blanking unit, a first transmission circuit and a first input-output unit. The blanking unit is configured to charge a pull-up control node in response to a compensation selection control signal and input a blanking pull-up signal to a blanking pull-up node. The first transmission circuit is electrically connected to the blanking pull-up node and the first pull-up node; and the first input-output unit includes a first leakage preventing structure, the first leakage preventing structure is electrically connected to the first pull-up node and a first leakage preventing node respectively, and the leakage preventing structure is configured to control a level of the first leakage preventing node under the control of the level of the first pull-up node to prevent the first pull-up node from leaking.