Active Matrix Display Timing for Motion Blur Reduction
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Solution Overview
Problem
Hold type image display units, such as liquid crystal displays, suffer from moving image blurriness due to their hold display nature, which cannot be effectively addressed by increasing response speed or doubling frame frequency without imposing significant burdens on circuit operating speed and connection interfaces.
Innovation Solution
An active matrix type display unit with a rate conversion circuit that converts video signals to a higher vertical frequency, combined with a time base emphasizing circuit using image data from adjacent frames to reduce blurriness, allowing for display without flicker and reduced operational burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the frame frequency is doubled to reduce moving image blurriness, then the moving image clarity is improved, but the operating speed burden on circuits and connection interfaces increases significantly
Solution Approach 1:
The patent applies frame rate conversion by changing the temporal parameter of the video signal from 60Hz to 120Hz, enabling hold-type displays to reduce moving image blurriness without requiring proportional increases in circuit operating speed, as the conversion is performed through signal processing rather than hardware speed escalation
Solution Approach 2:
The patent generates additional intermediate frames by copying and interpolating existing frame data, creating a 120Hz signal from a 60Hz source. This allows the display to operate at higher frame rates without requiring the source system to generate or transmit twice the original amount of data, thereby reducing the burden on connection interfaces
2Manufacturing precision
If the response speed of liquid crystal is increased to reduce moving image blurriness, then the image clarity is improved, but the hold display advantage is lost and flicker may occur
Solution Approach 1:
The patent changes the frame frequency parameter from 60Hz to 120Hz, which reduces the hold time between frames. This shorter hold time reduces the visual integration effect that causes moving image blurriness, while still maintaining the hold-type display's flicker-free advantage by keeping the refresh rate within the critical fusion frequency range
3Manufacturing precision
If the hold time is shortened to reduce moving image blurriness, then the moving image clarity is improved, but the display flicker increases
Solution Approach 1:
The patent increases the frame frequency from 60Hz to 120Hz, which effectively shortens the hold time between frames to reduce moving image blurriness. By doubling the frame rate, the display maintains flicker-free operation because the higher refresh rate keeps the persistence of vision effect active, preventing perceptible flicker even with reduced hold times
Data Source
AI summary
An active matrix type display panel is a hold type display panel which has a plurality of pixels arranged in a matrix form, and holds and displays an electrical signal pixel by pixel for a predetermined time. A frame rate conversion circuit converts a video signal having a first vertical frequency (60 Hz) into a video signal having a second vertical frequency (120 Hz) which is m/n-fold (wherein m is an integer of 2 or more, n is an integer of 1 or more, and conditions of m>n are satisfied) of the first vertical frequency. A time base emphasizing circuit subjects an output from the frame rate conversion circuit to time base emphasis. A drive circuit displays the video signal having the second vertical frequency in a display panel.