Liquid Crystal Display Device Segmented Driving
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Solution Overview
Problem
Liquid crystal display devices driven by the field sequential method face challenges with insufficient response speed, leading to intermixing of colors and luminance fluctuations, especially at high driving frequencies, resulting in nonuniform display quality and background blur in see-through applications.
Innovation Solution
The implementation of a liquid crystal display device with a matrix arrangement of pixels, where scanning lines and signal lines are divided into groups to overlap scanning periods, allowing for simultaneous signal writes in opposite directions, enhancing the response speed and achieving a transparent displaying state without voltage applied to the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If field sequential driving method is used to eliminate color filters, then light utilization efficiency is improved, but response speed becomes insufficient leading to color intermixing and luminance fluctuations
Solution Approach 1:
The patent segments the pixel array into multiple regions with different driving frequencies. Specifically, a first region (central area) is driven at a higher frequency while a second region (peripheral area) is driven at a lower frequency. This segmentation allows each region to be optimized independently - the central region achieves faster response for high-quality display, while the peripheral region maintains adequate response without excessive power consumption, thereby resolving the contradiction between light utilization efficiency and response speed.
Solution Approach 2:
The patent applies different driving parameters to different spatial locations within the display panel. The driving frequency is adjusted according to the local requirements of each region - higher frequency in the central viewing area where display quality is most critical, and lower frequency in the peripheral areas. This local quality approach allows the system to achieve high response speed where needed while maintaining overall light utilization efficiency.
2Productivity
If higher driving frequency is applied to achieve similar frame rate, then display frequency is improved, but response time becomes insufficient causing color intermixing
Solution Approach 1:
The patent implements dynamic driving frequency adjustment where the driving frequency is not uniform across the entire panel but varies by region. The control circuit dynamically assigns higher frequencies to regions requiring faster response (central area) and lower frequencies to regions where slower response is acceptable (peripheral area). This dynamic adaptation resolves the contradiction between display frequency and response time by optimizing each region's operating parameters.
3Ease of manufacture
If uniform driving frequency is applied across all pixels, then manufacturing simplicity is maintained, but display uniformity deteriorates due to timing differences in signal writes
Solution Approach 1:
The patent divides the pixel array into multiple regions with different driving frequencies, creating a segmented driving approach. While this increases circuit complexity compared to uniform driving, the segmentation is implemented in a systematic way (central vs. peripheral regions) that balances display uniformity with manageable circuit design. The segmented approach corrects timing differences across the panel by allowing regions farther from the driver to receive extended drive periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves light utilization efficiency and reduces display unevenness, achieving high-quality see-through displays with reduced intermixing of colors and luminance fluctuations.
Implementation Method 1
a liquid crystal layer arranged between a pair of substrates
Data Source
AI summary
A liquid crystal display device performs displaying by field sequential driving. The liquid crystal display device includes a plurality of scanning lines; and a plurality of signal lines including a plurality of pairs of signal lines, each pair of signal line being connected to one pixel column. Under field sequential driving, within one field period of emitting any of a plurality of color rays, there is an overlap between: a first period in which a first scanning line group included among the plurality of scanning lines are scanned and one of the pair of signal lines is used to perform signal writes; and a second period in which a second scanning line group included among the plurality of scanning lines are scanned, and another one of the pair of signal lines is used to perform signal writes.