Display Device Black Image Insertion Response Speed
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Solution Overview
Problem
Hold-type display devices exhibit slower response speed compared to impulse-type devices, and techniques to enhance response speed, such as Japanese Patent Laid-open 2004-212747, can lead to peculiar display irregularities, especially with increasing operational frequency and pixel capacitance.
Innovation Solution
A display device that periodically inserts black images with varying signal polarity, duration, and gate signal timing to improve response speed, reducing display irregularities by adjusting video and gate signal voltages and timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operational frequency is enhanced to improve response speed by increasing the interval that black appears, then the response speed as viewed with the naked eye is improved, but peculiar display irregularities occur
Solution Approach 1:
The patent applies periodic action by inserting black images at regular intervals during display operation. This periodic insertion of black images refreshes the pixel capacitance and maintains stable display performance while improving perceived response speed, preventing the peculiar irregularities that would otherwise occur at high operational frequencies
Solution Approach 2:
The patent changes the parameter of black image insertion frequency and timing to optimize display performance. By adjusting when and how frequently black images are inserted, the system achieves improved response speed while maintaining display regularity, resolving the contradiction between speed enhancement and reliability
2Duration of action of stationary object
If the pixel capacitance is increased, then the display can maintain image hold capability, but peculiar display irregularities occur when black images are periodically inserted
Solution Approach 1:
The periodic insertion of black images serves to refresh the increased pixel capacitance, preventing charge leakage and maintaining voltage stability. This periodic refresh mechanism ensures that larger capacitance values do not lead to display irregularities, but instead maintain stable image hold capability over time
3Speed
If the interval that black appears is increased to improve response speed, then the response speed as viewed with the naked eye is enhanced, but power consumption increases
Solution Approach 1:
The patent implements periodic black image insertion at optimized intervals that balance response speed improvement with power consumption management. By inserting black images only when necessary to maintain display regularity and refresh pixel capacitance, the system achieves enhanced perceived response speed without excessive power consumption
Solution Approach 2:
The system dynamically adjusts the timing and frequency of black image insertion based on display conditions, optimizing the balance between response speed enhancement and power consumption. This parameter optimization ensures that black images are inserted frequently enough to maintain display regularity but not so frequently as to cause unnecessary power waste
Data Source
AI summary
The present invention provides a display device which displays a black image by periodically inserting the black image, wherein after the display of the black image, a first period in which a video signal different from a video signal for the black image is outputted to video signal lines is made different from a succeeding period in length.