Liquid Crystal Display Driving Frequency and Light Control for Motion Blur
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Solution Overview
Problem
Liquid crystal display devices face challenges in effectively displaying moving pictures due to slow response speed and motion blur, which are exacerbated by the hold type operation and increased power consumption when handling still images versus moving images.
Innovation Solution
The liquid crystal display device incorporates a liquid crystal panel with an image data judging unit, an image data correcting unit, and a light source driving unit that differentiate between still and moving image data, adjusting driving frequency, light source control, and frame memory management to optimize image quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the liquid crystal display device operates at high driving frequency to improve moving picture display quality, then motion blur is reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamic driving frequency adjustment by detecting whether input image data is still image data or moving picture data. When still image data is detected, the driving frequency is reduced to half of the original frequency, thereby reducing power consumption while maintaining adequate display quality for static images.
Solution Approach 2:
The patent changes the driving frequency parameter based on image type detection. The system switches between two driving frequency states: full frequency for moving pictures and half frequency for still images, optimizing the balance between response speed and power consumption for different display scenarios.
2Use of energy by stationary object
If the liquid crystal display device uses hold type operation to maintain image display, then power consumption is reduced for still images, but motion blur increases for moving pictures
Solution Approach 1:
The patent dynamically adjusts the driving frequency based on image type detection. For moving picture data, the system maintains high driving frequency to prevent motion blur, while for still image data, it reduces frequency to save power, thereby adaptively managing the trade-off between motion clarity and energy consumption.
Solution Approach 2:
The patent employs an image data judging unit that detects whether input image data is still image data or moving picture data, providing feedback to the light source driving unit and image data correcting unit. This feedback mechanism enables real-time adjustment of driving parameters to optimize both motion blur reduction and power consumption.
3Illumination intensity
If the light source drives at full brightness to improve image clarity, then image quality is enhanced, but power consumption increases
Solution Approach 1:
The patent applies partial action by selectively controlling light sources based on motion detection. When a display region has a motion value greater than a reference value indicating motion blur, only the light sources corresponding to that region are controlled to increase brightness, while other regions maintain normal or reduced brightness, thereby reducing overall power consumption while targeting motion blur correction where needed.
Solution Approach 2:
The patent implements local quality enhancement by controlling specific light sources corresponding to display regions with motion blur issues, rather than uniformly increasing brightness across the entire display. This localized approach improves image clarity in problematic areas while minimizing power consumption increases.
4Manufacturing precision
If frame memory stores full resolution data to maintain image quality, then image fidelity is preserved, but memory requirements and processing complexity increase
Solution Approach 1:
The patent changes the frame rate parameter for moving picture data, using half the number of frames per second for storage and processing compared to the output rate. This parameter change reduces memory requirements and processing complexity while maintaining adequate image quality for moving picture display.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel including a plurality of signal lines, a liquid crystal panel driving unit configured to provide a driving voltage to the plurality of signal lines, an image data judging unit configured to judge whether input image data is still image data or moving picture data, an image data correcting unit configured to correct moving picture data to output corrected moving picture to the liquid crystal panel driving unit, a plurality of light sources configured to provide a light to the liquid crystal panel, and a light source driving unit configured to detect a display region having a motion value larger than a reference value from among an image of which frame data is displayed, based on a comparison of current frame data of the moving picture data with previous frame data of the moving picture data.