Liquid Crystal Display Panel Driving Timing and Duty Cycle
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Solution Overview
Problem
The combination of data line sharing (DLS) driving scheme with 2-dot inversion in liquid crystal display panels results in different charging rates for sub-pixels connected to the same data line, leading to brightness differences and the appearance of unexpected stripes on the display screen.
Innovation Solution
A liquid crystal display panel design where adjacent data lines transmit data voltages with opposite polarities, and each pixel unit includes a first and second sub-pixel sharing the same data line, with the first sub-pixel driven earlier and receiving a greater duty cycle scan signal than the second sub-pixel, and optionally pre-charged with a common voltage to equalize charging rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data line sharing (DLS) driving scheme is combined with 2-dot inversion, then the number of data lines is reduced, but the charging rates of sub-pixels connected to the same data line become different
Solution Approach 1:
The patent applies local quality by differentiating the driving parameters for different sub-pixels. Specifically, sub-pixels connected to the same data line are driven with different duty cycles (first duty cycle for odd-numbered sub-pixels, second duty cycle for even-numbered sub-pixels) to compensate for the different charging rates caused by DLS, thereby achieving uniform display quality across all sub-pixels.
Solution Approach 2:
The patent changes the driving parameters (duty cycle of scan signals) to resolve the charging rate difference. By adjusting the duty cycle parameter differently for sub-pixels connected to the same data line, the patent compensates for the unequal charging rates and eliminates the stripe artifacts, while maintaining the DLS configuration.
2Manufacturing precision
If different duty cycles are applied to sub-pixels connected to the same data line, then charging rate difference is reduced, but driving timing complexity increases
Solution Approach 1:
The patent segments the sub-pixels into two groups (odd-numbered and even-numbered sub-pixels) and applies different duty cycles to each group. This segmentation approach allows systematic management of the different driving parameters while maintaining overall system organization and controllability.
Solution Approach 2:
The patent employs periodic action by alternating between two duty cycle values (first and second duty cycles) for adjacent sub-pixels. This periodic pattern simplifies the control logic compared to unique parameters for each sub-pixel, as the driving scheme repeats every two sub-pixels, thereby reducing timing complexity while achieving uniform charging rates.
Data Source
AI summary
The application discloses a liquid crystal display panel and a display device. In the liquid crystal display panel, each pixel unit includes a first sub-pixel and a second sub-pixel. The polarities of the data voltages received by two adjacent pixel units sharing the same data line are opposite. In each pixel unit, the driving timing of the first sub-pixel is earlier than the driving timing of the second sub-pixel, and the duty cycle of the scan signal received by the first sub-pixel is greater than the duty cycle of the scan signal received by the second sub-pixel.