Driving Circuit for Display Device Preventing Screen Switching Smearing
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Solution Overview
Problem
Liquid crystal display panels face issues with screen switching smearing due to light-emitting components not fully turning off during the transition, leading to reduced contrast ratios and display quality.
Innovation Solution
A driving circuit comprising a data writing circuit, control circuit, and driving sub-circuit is used to control scanning signals, ensuring the light-emitting components do not emit light before screen switching, and only emit light when both scanning signals are present, thereby maintaining a black display during transitions and enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light-emitting component continues to emit light during screen switching, then the display appears continuous, but smearing occurs and contrast ratio deteriorates
Solution Approach 1:
The patent applies preliminary action by controlling the light-emitting component to turn off before the screen switching operation occurs. The control circuit receives a switching signal and preemptively stops the driving voltage to the light-emitting component, ensuring it is already off when the screen transition begins, thus preventing smearing from the outset
Solution Approach 2:
The patent implements preliminary anti-action by applying a counter-action (turning off the light-emitting component) in advance to offset the harmful effect of smearing that would otherwise occur during screen switching. The control circuit actively suppresses light emission before the transition, creating a black display state that prevents the harmful smearing effect
2Object-affected harmful factors
If the light-emitting component turns off completely during screen switching, then smearing is prevented, but display continuity is interrupted
Solution Approach 1:
The patent applies periodic action by implementing a controlled on-off cycle for the light-emitting component. During normal operation, the component emits light continuously, but during screen switching, it periodically turns off to prevent smearing, then resumes emission after the transition completes. This periodic control maintains both display continuity and smearing prevention
Solution Approach 2:
The control circuit performs preliminary action by preparing the light-emitting component to turn off before the screen switch occurs, ensuring seamless transition. The component is already in the off state when switching begins, maintaining display stability while preventing smearing, then resumes normal operation immediately after switching completes
3Object-affected harmful factors
If a control circuit is added to manage scanning signals, then smearing is eliminated, but device complexity increases
Solution Approach 1:
The control circuit is designed with multi-functionality, serving both to manage the scanning signals for the light-emitting component and to detect screen switching operations. By integrating multiple functions into a single circuit block, the patent reduces overall device complexity while still achieving smearing elimination through coordinated signal control
Solution Approach 2:
The patent merges the control of scanning signals with the detection of screen switching operations into a single integrated control circuit. This consolidation combines what could be separate functions into one unified circuit, reducing the number of discrete components and simplifying the overall device architecture while maintaining the ability to prevent smearing
Data Source
AI summary
Disclosed are a driving circuit, a driving method and a display device. The driving circuit (100) comprises: a data writing circuit (101), configured to, under control of a first scanning signal received at the first scanning signal end, write a data signal received at the data signal end into the first node; a control circuit (102), configured to, under control of a third scanning signal received at the third scanning signal end (SCAN3), write a data signal received by the first node (N1) into the second node (N2); and a driving sub-circuit (103), configured to, under control of a data signal received at the second node (N2), use a driving voltage received at the driving voltage end (Vdd) to drive the light-emitting component 104.