Liquid Crystal Display Motion Blur Reduction via Dynamic Pixel Clock
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Solution Overview
Problem
Liquid crystal display devices suffer from motion blur due to the discontinuity of refresh times, causing the actual object position to differ from the anticipated position in the human brain, leading to visual persistence and motion compensation issues.
Innovation Solution
A display device and method that includes a liquid-crystal display panel, a driving module, a backlight module, and a processing module, which generates output display data with a higher pixel clock and includes a dummy data section to allow the backlight to be turned on after the liquid-crystal display panel has reacted to the output frame data, effectively reducing motion blur by increasing the reaction time of the display units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the liquid crystal display panel refreshes at a fixed frame rate (e.g., 60Hz), then the display maintains stable timing and synchronization, but motion blur occurs because the panel cannot fully react to frame data before the next refresh cycle begins
Solution Approach 1:
The patent introduces a dynamic pixel clock mechanism that varies the data transmission speed within each frame cycle. The pixel clock is increased during the front porch period to allow the liquid crystal display panel more time to react to frame data, then returns to normal speed for regular data transmission. This dynamic adjustment resolves the contradiction by making the system adaptable to the panel's reaction time requirements while maintaining overall frame rate stability
Solution Approach 2:
The patent implements preliminary action by transmitting frame data earlier in the cycle and using the front porch period for additional data transmission. The processing module prepares and transmits data during periods when the panel is transitioning, ensuring the panel has sufficient reaction time before the next frame begins, thereby preventing motion blur while maintaining the scheduled frame refresh rate
2Productivity
If the pixel clock is increased to transmit more data faster, then the frame data transmission completes in less time, but the liquid crystal display panel does not have sufficient time to react to the frame data before the next refresh cycle
Solution Approach 1:
The patent dynamically adjusts the pixel clock frequency based on the timing requirements of each frame cycle. During the front porch period, the pixel clock is temporarily increased to transmit additional data, then reduced to allow the liquid crystal display panel sufficient reaction time. This dynamic frequency modulation resolves the contradiction between fast data transmission and adequate panel reaction time
Solution Approach 2:
The patent uses periodic variation of the pixel clock within each frame cycle, specifically during the front porch period. The pixel clock is periodically increased to transmit data faster during this window, then returns to normal frequency for the remainder of the cycle, ensuring the panel has adequate time to react while maintaining high overall data transmission efficiency
3Duration of action of moving object
If the frame time is extended to allow the liquid crystal display panel more reaction time, then motion blur is reduced, but the overall refresh rate decreases and frame continuity is affected
Solution Approach 1:
The patent resolves this contradiction by utilizing the front porch period - a time dimension within the existing frame cycle that is traditionally used for synchronization but not for data transmission. By transmitting additional frame data during this previously underutilized period with an increased pixel clock, the patent effectively extends the reaction time available to the liquid crystal display panel without extending the overall frame time, thus maintaining the frame refresh rate while reducing motion blur
Data Source
AI summary
A display device for motion blur reduction effect is provided which includes a liquid-crystal display panel, a driving module, a backlight module and a processing module. The processing module receives input display data to generate output display data. The output display data includes an output frame data section for performing data transmission with an output pixel clock higher than an input pixel clock and an output blank section within the same frame time. The processing module drives the liquid-crystal display panel to generate a display frame according to the output display data and controls the backlight module to turn on within the output blank section after the liquid-crystal display panel finished reacting to output frame data corresponding to the output frame data section.