Display Drive Circuit Black Insertion for Motion Blur Reduction

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Solution Overview

Problem

Hold type display devices, such as LCDs, suffer from image retention and motion blur when displaying dynamic frames, which are not effectively addressed by existing technologies.

Innovation Solution

A drive circuit with a dynamic refresh unit, timer, and black insertion drive unit is used to output dynamic refresh signals, compute black insertion time signals, and perform black insertion by adjusting frame times and backlight control, simulating an impulse type display to reduce motion blur.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If black insertion is performed by inserting a black picture between frames, then motion blur is reduced, but picture brightness becomes unstable and flickering occurs

Engineering Contradiction:

Improvemotion blurVSAvoidpicture brightness stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent applies periodic action by implementing black insertion at specific intervals between frames. The drive circuit inserts black pictures between certain frames (e.g., between odd and even frames) periodically, which reduces motion blur while maintaining overall picture brightness stability through controlled, rhythmic application rather than continuous insertion.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes parameters by dynamically adjusting the black insertion timing and duration based on frame time variations. The drive circuit computes black insertion time signals based on actual frame display times and adjusts the black insertion duration accordingly, ensuring that the total display time remains consistent while reducing motion blur effects.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If frame time is dynamically adjusted, then display flexibility is improved, but picture brightness consistency deteriorates

Engineering Contradiction:

Improveframe time adaptabilityVSAvoidpicture brightness consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent implements feedback by using the actual frame time information to compute and adjust black insertion timing. The drive circuit receives frame time data, calculates appropriate black insertion durations based on this feedback, and adjusts the black insertion drive signals accordingly, thereby maintaining picture brightness consistency despite dynamic frame time variations.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies dynamics by making the black insertion duration and timing variable rather than fixed. The drive circuit dynamically adjusts the black insertion parameters based on real-time frame time conditions, allowing the system to adapt to varying display requirements while maintaining overall brightness consistency through intelligent control.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10665185B2Drive circuit and picture black insertion method of display device

Publication Date: 2020.05.26 ASUSTEK COMPUTER INC

AI summary

A drive circuit for driving a display panel includes a dynamic refresh unit, a timer, and a black insertion drive unit. The dynamic refresh unit is configured to output a dynamic refresh signal, so as to control the display panel to display a plurality of frames in sequence. A frame time of each of the frames is adjusted according to the dynamic refresh signal. The timer is configured to compute a black insertion time signal. The black insertion drive unit is configured to output a black insertion drive signal according to the black insertion time signal, so as to perform black insertion on the frames.