Display Frame Synchronization for Mixed Video and Graphics Output

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Solution Overview

Problem

Display apparatuses experience noise in output images due to mismatched video and graphics frames, resulting from different processing paths that lead to asynchronous rendering.

Innovation Solution

Implement a display apparatus with synchronized video and graphics frames by calculating and adjusting delay times using a main processing unit to compensate for video and graphics delay times, potentially shortening video delays and extending graphics delays to match output times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If video and graphics signals are processed through different paths independently, then processing efficiency is improved, but frame synchronization deteriorates causing noise in output image

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidframe synchronization

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The main processing unit calculates delay times for both video and graphics frames by comparing rendering request times with output times, then uses this feedback information to compensate and synchronize the frames before mixing, ensuring that independently processed signals are aligned in the final output

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The synchronization process is performed in advance before the video and graphics frames are mixed. The main processing unit calculates delay times and compensates for them beforehand, so that when frames are mixed and output, they are already synchronized, preventing noise without reprocessing the independent processing paths

Inventive Principle:

Principle #10Preliminary action

2Loss of time

If video delay time is shortened to improve responsiveness, then user experience is improved, but synchronization with graphics frames deteriorates

Engineering Contradiction:

Improvevideo delay timeVSAvoidframe synchronization

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The system dynamically adjusts the delay time parameter for video frames based on the calculated difference between video and graphics processing times. By changing this temporal parameter, the system achieves synchronization without requiring fundamental changes to the independent processing architecture

Inventive Principle:

Principle #35Parameter changes

3Reliability

If graphics delay time is extended to match video output time, then frame synchronization is improved, but processing efficiency deteriorates

Engineering Contradiction:

Improveframe synchronizationVSAvoidprocessing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The main processing unit acts as an intermediary that calculates and determines the appropriate delay time for graphics frames. Instead of extending delay arbitrarily, the intermediary computes the precise compensation needed based on rendering request times and output times, achieving synchronization with minimal impact on processing efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260046472A1Display driving apparatus, and display apparatus having the same

Publication Date: 2026.02.12 SAMSUNG ELECTRONICS CO LTD

AI summary

A display apparatus includes: a video processing unit processing a video signal; a graphics processing unit processing a graphics signal; a mixing unit mixing video corresponding to the processed video signal and graphics corresponding to the processed graphics signal; a display unit outputting the mixed video and graphics; and a main processing unit configured to control the video processing unit, the graphics processing unit, the mixing unit and the display unit.