LCD Driving Method Adjusting Grey Values for 120 Hz Refresh
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Solution Overview
Problem
High refreshing frequencies in LCD displays result in insufficient charging time, leading to compromised display quality due to the inability of capacitors to charge adequately within the short response time.
Innovation Solution
A driving method that adjusts the original grey value of sub-pixels by comparing them with high and low grey value thresholds, adjusting them to a predetermined value if they exceed or fall below these thresholds, allowing for efficient charging and improved luminance during frame transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the refreshing frequency is increased to 120 Hz to improve display smoothness, then the response time needs to be further shortened, but the capacitor does not have enough time to be charged which ruins the display quality
Solution Approach 1:
The patent applies preliminary action by adjusting the grey value of the current frame before display based on the grey value of the next frame. When the next frame has a significantly higher grey value, the current frame's grey value is increased in advance to pre-charge the capacitor, ensuring sufficient charging time even at 120 Hz refresh rate while maintaining display quality
Solution Approach 2:
The patent changes the grey value parameter dynamically based on threshold comparisons. By comparing current and next frame grey values against predetermined thresholds, the system adjusts the current frame's grey value parameter to optimize charging time, resolving the contradiction between high refresh frequency and adequate capacitor charging
Data Source
AI summary
A driving method, a driving device and a liquid crystal display device are provided. The driving device of the LCD display device outputs the target grey value of the nth frame according to the original grey value of the nth frame, the original grey value of the (n−1)th frame and the look-up table. This improves the luminance of the sub-pixel of the nth frame, shortens the required charging time of the sub-pixel when the (n+1)th frame is being displayed. Thus, the sub-pixel of the (n+1)th frame could be efficiently charged and the luminance of the sub-pixel could be increased. In addition, since the luminance increase of the (n+1)th frame is more than that of the nth frame, the contrast of the LCD display could be improved.