Integrated Shift Register Unit for Compact OLED Scan and Sense Driving

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Solution Overview

Problem

The existing gate driving circuits for OLED displays are large in size due to the need for separate circuits to handle scan and sense driving signals, leading to issues like uneven brightness and increased bezel size, especially in large displays.

Innovation Solution

A shift register unit with a shared blanking unit and cascaded transmission circuits that handle both scan and sense driving signals, reducing the overall circuit size and enabling random compensation to mitigate uneven brightness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate circuits are used to handle scan and sense driving signals, then the driving function is complete, but the circuit area increases

Engineering Contradiction:

Improvedriving functionVSAvoidcircuit area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent merges the scan signal driving circuit and sense signal driving circuit into a single integrated circuit. The shift register unit generates both scan signals and sense signals through shared transmission circuits and control nodes, eliminating the need for separate dedicated circuits for each function.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shift register unit is designed as a universal circuit that performs multiple functions: it generates scan signals for row selection, generates sense signals for compensation, and manages both display and blanking phases through a single integrated structure with shared resources.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If separate circuits are used for scan and sense signals, then signal generation is reliable, but the bezel size increases

Engineering Contradiction:

Improvesignal generationVSAvoidbezel size

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

By combining the scan and sense signal generation functions into a single integrated shift register unit, the overall circuit footprint is reduced, which directly decreases the bezel size while maintaining reliable signal generation through the unified circuit design.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If progressive sequential compensation is used, then compensation can be implemented, but uneven brightness occurs

Engineering Contradiction:

Improvecompensation capabilityVSAvoidbrightness uniformity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent implements random compensation by dynamically selecting which row to compensate based on a random number generator rather than following a fixed sequential pattern. This dynamic approach distributes compensation operations more evenly across the display, preventing the cumulative brightness unevenness that occurs with progressive sequential compensation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250225940A1Shift Register Unit, Gate Driving Circuit, Display Device, and Driving Method

Publication Date: 2025.07.10 HEFEI XINSHENG OPTOELECTRONICS TECH CO LTD

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 first transmission circuit and a first input-output unit. The first transmission circuit is electrically connected to a blanking pull-up node and a first pull-up node. The first input-output unit includes an output circuit, a first pull-down control circuit, and a first pull-down auxiliary control circuit.