LCD Driving Unit Segmented Shift Register for High Resolution
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Solution Overview
Problem
In liquid crystal display (LCD) devices with high resolution and large dimensions, the reduced horizontal period for applying scan signals leads to insufficient charging time for flip-flops, resulting in longer rising and falling times of scan signals, which degrades image quality and makes it difficult to fabricate devices with high resolution.
Innovation Solution
A driving unit is designed where flip-flops of the shift register unit are divided into two groups, each initially set by a different gate start voltage and synchronized with clock signals, allowing for alternately outputting scan signals to ensure sufficient charging time and reduce rising and falling times of output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the horizontal period is reduced to increase resolution, then the resolution is improved, but the charging time for flip-flops becomes insufficient
Solution Approach 1:
The shift register unit is divided into two separate groups, each with its own flip-flops and clock signals. This segmentation allows independent operation of the two groups, enabling sufficient charging time for each flip-flop even when the overall horizontal period is reduced for high resolution displays.
2Manufacturing precision
If the horizontal period is reduced to increase resolution, then the resolution is improved, but the rising and falling times of scan signals increase
Solution Approach 1:
The two groups of flip-flops operate alternately with different clock signals, creating a periodic action pattern. This allows scan signals to be generated with sufficient rising and falling times within each group's operational cycle, while maintaining the overall high resolution requirement through the combined output of both groups.
3Device complexity
If a single group of flip-flops is used, then the device complexity is low, but the image quality degrades due to insufficient charging time
Solution Approach 1:
The shift register unit is divided into two separate groups, each with its own flip-flops and clock signals. This segmentation allows independent operation of the two groups, enabling sufficient charging time for each flip-flop even when the overall horizontal period is reduced for high resolution displays.
Data Source
AI summary
A driving unit for a liquid crystal display device is provided. The driving unit includes a first group of driving stages and a second group of driving stages. A first driving stage of the first group receives a first gate start voltage. The first group of driving stages sequentially outputs scan signals according to a first clock signal. The scan signal outputted by one driving stage of the first group is sent to a next subsequent driving stage of the first group. A first driving stage of the second group receives a second start voltage. The second group of driving stages sequentially outputs the scan signals according to a second clock signal. The scan signal outputted by one driving stage of the second group is sent to a next subsequent driving stage of the second group. The driving stages of the first group and the second group alternately output the scan signals.