Shift Register Unit Shared Blanking Circuit for OLED Bezel Reduction
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Solution Overview
Problem
Current gate driving circuits for OLED displays are complex and large, leading to increased bezel size and cost, and suffer from issues such as uneven brightness and scanning line progression due to progressive sequential compensation methods.
Innovation Solution
A shift register unit with a shared blanking unit, first and second transmission circuits, and input-output units that allow for random compensation, reducing the size of the bezel and improving display uniformity by enabling random output of sense driving signals during a frame's blanking phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gate driving circuit is integrated in a GATE IC with complex structure, then the driving function is complete, but the chip area increases leading to higher cost and larger bezel size
Solution Approach 1:
The patent merges the blanking unit with the shift register unit, allowing the blanking unit to share circuit resources (transistors, capacitors, control signals) with the shift register unit. This integration eliminates redundant components and reduces the overall chip area while maintaining complete driving functions for both display and blanking phases
Solution Approach 2:
The shift register unit is designed to perform multiple functions: it serves as both the shift register for scanning control and the blanking unit for random blanking operations. The same circuit structure generates both scan signals and blanking signals, making the circuit universal and reducing chip area
2Ease of manufacture
If progressive sequential compensation is used, then compensation is implemented, but uneven brightness and scanning line progression occur
Solution Approach 1:
The patent implements dynamic random blanking where the blanking phase timing is randomly adjusted within each frame period. This dynamic randomness prevents fixed patterns of scanning line progression and uneven brightness that occur with progressive sequential compensation, while still achieving compensation through random selection of blanking moments
Data Source
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AI summary
A shift register unit (10), a gate driving circuit (20), a display device (1), and a driving method. The shift register unit (10) comprises a blanking unit (100), a first transmission circuit (210), a second transmission circuit (220), a first input/output unit (310), and a second input/output unit (320). The blanking unit (100) is configured to charge a pull-up control node (H) and input a blanking pull-up signal to a blanking pull-up node (N) in response to a compensation selection control signal; the first transmission circuit (210) is electrically connected to the blanking pull-up node (N) and a first pull-up node (Q1), and in response to a first transmission signal, is configured to utilize the blanking pull-up signal to charge the first pull-up node (Q1). The shift register unit (10) may share the blanking unit (100), so that the display device (1) using the shift register unit (10) may reduce the bezel size.