Shift Register Composite Driving Signals for Black Insertion

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Solution Overview

Problem

Existing gate driving circuits in display devices are complex and require a sensing driving period for black insertion, leading to image streaking phenomena and increased circuit complexity.

Innovation Solution

A shift register and gate driving circuit that outputs composite driving signals, including display driving signals, sense driving signals, and black insertion driving signals, allowing for black insertion and sub-pixel compensation during the black insertion driving stage, eliminating the need for a separate sensing driving period and simplifying the circuit structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate sensing driving period is added to perform black insertion and sub-pixel compensation, then the display quality is improved, but the driving process and timing sequence become more complicated

Engineering Contradiction:

Improvedisplay qualityVSAvoiddriving process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the sensing driving function into the black insertion driving stage. The output circuit outputs both sense driving signals and black insertion driving signals during the same time period, eliminating the need for a separate sensing driving period. This combines multiple functions (sensing and black insertion) into a single driving stage, simplifying the overall driving process while maintaining display quality.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If a sensing input circuit is added to the shift register, then the pixel compensation signal detection capability is improved, but the circuit structure becomes more complex

Engineering Contradiction:

Improvepixel compensation detection capabilityVSAvoidcircuit structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The output circuit of the shift register is designed to perform multiple functions: it can output display driving signals, sense driving signals, and black insertion driving signals. By making the output circuit universal and capable of handling different signal types, the patent eliminates the need for a separate sensing input circuit, thus maintaining pixel compensation detection capability while simplifying the overall circuit structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The sensing function is extracted from the traditional separate sensing input circuit and integrated into the output circuit of the shift register. The output circuit now directly provides sense driving signals to the pixel circuit during the black insertion driving stage, removing the need for dedicated sensing input circuitry while maintaining the necessary detection capability.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If black insertion is performed to shorten response time, then the response time is improved, but image streaking phenomena occur requiring complex compensation circuits

Engineering Contradiction:

Improveresponse timeVSAvoidimage streaking

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful effect of black insertion (image streaking) into a beneficial opportunity for pixel compensation. During the black insertion driving stage, the sensing transistor is turned on to detect pixel compensation signals, and the pixel circuit performs compensation operations. This transforms the black insertion period from a purely harmful event into a dual-purpose stage that both shortens response time and enables compensation, eliminating image streaking without requiring additional complex circuits.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS11532278B2Shift registers, gate driving circuits and driving methods thereof, and display devices

Publication Date: 2022.12.20 HEFEI BOE ZHUOYIN TECH CO LTD

AI summary

A shift register driving method includes: in a black insertion driving period, the black insertion input circuit, in response to a black insertion control signal, causing the output circuit to first output a first sense driving signal and a second sense driving signal, so that the control electrode of the switching transistor receives the first sense driving signal to turn on the switching transistor, the first electrode of the switching transistor receives a sensing data signal, and the control electrode of the sensing transistor receives the second sense driving signal to turn on the sensing transistor, and a second electrode of the sensing transistor outputs a pixel compensation signal, at the same time the sub-pixel stops emitting light; the output circuit outputs a black insertion driving signal, and the pixel circuit receives the black insertion driving signal to turn off the driving transistor, and the sub-pixel keeps not emitting light.